FOCAL COMMUNICATIONS CORP
S-4/A, 1998-07-31
RADIOTELEPHONE COMMUNICATIONS
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<PAGE>
 
     
  AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 31, 1998.     
 
                                                     REGISTRATION NO. 333-49397
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ----------------
                                
                             AMENDMENT NO. 3     
                                      TO
                                   FORM S-4
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                               ----------------
 
                       FOCAL COMMUNICATIONS CORPORATION
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
                               ----------------
 
        DELAWARE                     4812                    36-4167094
     (STATE OR OTHER           (PRIMARY STANDARD          (I.R.S. EMPLOYER
     JURISDICTION OF              INDUSTRIAL           IDENTIFICATION NUMBER)
    INCORPORATION OR          CLASSIFICATION CODE
      ORGANIZATION)                 NUMBER)
 
         200 NORTH LASALLE STREET, SUITE 800, CHICAGO, ILLINOIS 60601
                                (312) 895-8400
   (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                 OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                               JOSEPH A. BEATTY
       EXECUTIVE VICE PRESIDENT, CHIEF FINANCIAL OFFICER, AND TREASURER
                       FOCAL COMMUNICATIONS CORPORATION
                      200 NORTH LASALLE STREET, SUITE 800
                            CHICAGO, ILLINOIS 60601
                                (312) 895-8400
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                                  COPIES TO:
                               SCOTT HODES, ESQ.
                              DAVID S. GUIN, ESQ.
                                ROSS & HARDIES
                           150 NORTH MICHIGAN AVENUE
                            CHICAGO, ILLINOIS 60601
                                (312) 558-1000
 
                               ----------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.
 
  If the securities being registered on this form are being offered in
connection with the formation of a holding company and there is compliance
with General Instruction G, please check the following box. [_]
 
 
                               ----------------
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933, OR UNTIL THE REGISTRATION
STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                   
                SUBJECT TO COMPLETION--DATED JULY 31, 1998     
 
PROSPECTUS
 
                                 $270,000,000
 
                       FOCAL COMMUNICATIONS CORPORATION
 
OFFER TO EXCHANGE ITS 12.125% SENIOR DISCOUNT NOTES DUE 2008, SERIES B FOR ANY
       AND ALL OF ITS OUTSTANDING 12.125% SENIOR DISCOUNT NOTES DUE 2008
 
   THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON     ,
                            1998, UNLESS EXTENDED.
 
  Focal Communications Corporation, a Delaware corporation ("Focal" or the
"Company"), hereby offers, upon the terms and subject to the conditions set
forth in this Prospectus (as the same may be amended or supplemented from time
to time) and in the accompanying Letter of Transmittal (the "Letter of
Transmittal") (which together constitute the "Exchange Offer"), to exchange
$1,000 stated principal amount at maturity of its 12.125% Senior Discount
Notes due February 15, 2008, Series B (the "Exchange Notes") which have been
registered under the Securities Act of 1933, as amended (the "Securities
Act"), for each $1,000 principal amount at maturity of its outstanding
unregistered 12.125% Senior Discount Notes due February 15, 2008, of which
$270,000,000 in aggregate principal amount at maturity is outstanding as of
the date hereof (the "Senior Notes" and, together with the Exchange Notes, the
"Notes").
 
  The form and terms of the Exchange Notes will be identical in all material
respects to the form and terms of the Senior Notes, except that (i) the
Exchange Notes will have been registered under the Securities Act and
therefore will not be subject to certain restrictions on transfer applicable
to the Senior Notes and (ii) holders of the Exchange Notes will not be
entitled to certain rights of holders of the Senior Notes under the
Registration Agreement dated February 15, 1998 (the "Registration Agreement")
among the Company and Salomon Brothers Inc, Morgan Stanley & Co. Incorporated
and NationsBanc Montgomery Securities LLC (the "Initial Purchasers"). The
Exchange Notes will evidence the same indebtedness as the Senior Notes (which
they replace) and will be issued pursuant to, and entitled to the benefits of,
an indenture dated as of February 18, 1998 between the Company and the Harris
Trust and Savings Bank, as trustee (the "Trustee"), governing the Senior Notes
and the Exchange Notes (the "Indenture").
 
  The Exchange Notes will mature on February 15, 2008. In the period prior to
February 15, 2003, interest at a rate of 12.125% per annum will accrue on the
Exchange Notes but will not be payable in cash ("Deferred Interest"). From
February 15, 2003, interest at a rate of 12.125% per annum ("Current
Interest") on the stated principal amount at maturity of the Exchange Notes
will be payable in cash semiannually on August 15 and February 15 of each
year, beginning on August 15, 2003. For U.S. federal income tax purposes, the
Exchange Notes will be considered to bear original issue discount.
Accordingly, holders of the Notes will be required to report income for tax
purposes in advance of the receipt of current payments to which such income is
attributable. See "Description of the Exchange Notes" and "Certain United
States Federal Income Tax Considerations."
 
  The Exchange Notes will be redeemable, at the option of the Company at any
time, in whole or in part, on or after February 15, 2003, at the redemption
prices set forth herein plus accrued and unpaid Current Interest, if any, to
the redemption date. In the event of one or more Public Equity Offerings (as
defined herein), following which there is a Public Market (as defined herein),
on or before February 15, 2001, the Company may, at its option, use all or a
portion of the net cash proceeds therefrom to redeem up to 35% of the
aggregate stated principal amount at maturity of the Exchange Notes at a
redemption price equal to 112.125% of the Accreted Value (as defined herein)
thereof plus accrued and unpaid Current Interest, if any, and Additional
Interest (as defined herein), if any, to the redemption date. See "Description
of the Exchange Notes--Optional Redemption." In the event of a Change of
Control (as defined herein) each holder of Exchange Notes will have the right
to require the Company to repurchase all or any part of such holder's Exchange
Notes at a purchase price equal to 101% of the Accreted Value thereof plus
accrued and unpaid Current Interest, if any, to the repurchase date (the
"Change of Control Purchase Price"). If after giving effect to a Change of
Control Offer (as defined herein) at least 95% of the original aggregate
stated principal amount at maturity of the Exchange Notes has been redeemed or
repurchased, the Company shall have the right to redeem the balance of the
Exchange Notes at a redemption price equal to 101% of the Accreted Value
thereof plus accrued and unpaid Current Interest, if any, and Additional
Interest, if any, to the redemption date. See "Description of the Exchange
Notes--Repurchase at the Option of Holders upon a Change of Control." There
can be no assurance that the Company will have the financial resources
necessary to repurchase the Exchange Notes in such circumstances.
                                                       (continued on next page)
 
                               ---------------
 
  SEE "RISK FACTORS" COMMENCING ON PAGE 11 FOR A DISCUSSION OF CERTAIN FACTORS
WHICH INVESTORS SHOULD CONSIDER IN CONNECTION WITH THE EXCHANGE OFFER AND AN
INVESTMENT IN THE EXCHANGE NOTES OFFERED HEREBY.
 
                               ---------------
 
  THESE SECURITIES HAVE  NOT BEEN APPROVED OR DISAPPROVED  BY THE SECURITIES
     AND EXCHANGE  COMMISSION  NOR  HAS THE  COMMISSION  PASSED  UPON THE
       ACCURACY  OR ADEQUACY OF THIS PROSPECTUS. ANY  REPRESENTATION TO
          THE CONTRARY IS A CRIMINAL OFFENSE.
 
                  The date of this Prospectus is     , 1998.
<PAGE>
 
(continued from previous page)
 
  The Exchange Notes will be senior unsecured obligations of the Company
ranking pari passu in right of payment with the Senior Notes and all other
existing and future senior unsecured indebtedness of the Company, if any, and
will rank senior in right of payment to all existing and future subordinated
indebtedness of the Company, if any. Holders of secured indebtedness of the
Company, however, will have claims that are prior to the claims of the holders
of the Exchange Notes with respect to the assets securing such indebtedness.
The Company is a holding company that conducts all of its operations through
its subsidiaries. The Notes will therefore be effectively subordinated to the
claims of creditors and holders of preferred stock of the Company's
subsidiaries. See "Risk Factors--Holding Company Structure; Effective
Subordination of the Exchange Notes" and "Description of the Exchange Notes--
Ranking." As of December 31, 1997, on a pro forma basis after giving effect to
the Offering (as defined herein) and the application of the net proceeds
therefrom, the Company would have had no outstanding indebtedness other than
the Notes.
 
  The Senior Notes were originally issued and sold on February 18, 1998 in a
transaction not registered under the Securities Act (the "Offering").
Accordingly, the Senior Notes may not be offered for resale, resold or
otherwise transferred unless so registered or unless an applicable exemption
from the registration requirements of the Securities Act is available. Based
on interpretations by the staff of the Securities and Exchange Commission (the
"Commission"), as set forth in no-action letters issued to third parties
unrelated to the Company, the Company believes that the Exchange Notes issued
pursuant to the Exchange Offer may be offered for resale, resold or otherwise
transferred by holders thereof (other than any holder that is (i) a broker-
dealer that acquired Senior Notes as a result of market-making activities or
other trading activities, or (ii) a broker-dealer that acquired Senior Notes
directly from the Company for resale pursuant to Rule 144A under the
Securities Act ("Rule 144A") or another available exemption under the
Securities Act) without compliance with the registration or prospectus
delivery provisions of the Securities Act, provided that such Exchange Notes
are acquired in the ordinary course of such holders' business, such holders
have no arrangement or understanding with any person to participate in the
distribution of such Exchange Notes and such holders are not "affiliates" of
the Company (within the meaning of Rule 405 under the Securities Act).
However, the staff of the Commission has not considered the Exchange Offer in
the context of a no-action letter, and there can be no assurance that the
staff of the Commission would make a similar determination with respect to the
Exchange Offer as in such other circumstances.
 
  By tendering Senior Notes in exchange for Exchange Notes, each holder will
represent to the Company, among other things, that: (i) any Exchange Notes to
be received by such holder will be acquired in the ordinary course of such
holder's business; (ii) at the time of the commencement of the Exchange Offer,
such holder has no arrangement or understanding with any person to participate
in the distribution (within the meaning of the Securities Act) of the Exchange
Notes; and (iii) such holder is not an "affiliate" of the Company (within the
meaning of Rule 405 under the Securities Act). Each broker-dealer that
receives Exchange Notes for its own account in exchange for Senior Notes,
where such Senior Notes were acquired by such broker-dealer as a result of
market-making activities or other trading activities, must acknowledge that it
will deliver a prospectus in connection with any resale of such Exchange
Notes. The Letter of Transmittal states that by so acknowledging and by
delivering a prospectus, a broker-dealer will not be deemed to admit that it
is an "underwriter" within the meaning of the Securities Act. This Prospectus,
as it may be amended or supplemented from time to time, may be used by a
broker-dealer in connection with resales of Exchange Notes received in
exchange for Senior Notes where such Senior Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities. The Company has agreed that, starting on the Expiration Date (as
defined herein) and ending on the close of business 90 days after the
Expiration Date, it will make this Prospectus available to any broker-dealer
for use in connection with any such resale. See "Plan of Distribution."
 
  The Company does not intend to apply for listing of the Exchange Notes for
trading on any securities exchange or for inclusion of the Exchange Notes in
any automated quotation system. The Senior Notes, however, have been
designated for trading in the Private Offerings, Resales and Trading through
Automatic Linkages ("PORTAL") Market of the National Association of Securities
Dealers, Inc. Any Senior Notes not tendered and
 
                                       2
<PAGE>
 
accepted in the Exchange Offer will remain outstanding. To the extent that
Senior Notes remain outstanding, a holder's ability to sell such Senior Notes
could be adversely affected. Following consummation of the Exchange Offer, the
holders of Senior Notes will continue to be subject to the existing
restrictions on transfer thereof and the Company will have no further
obligation to such holders to provide for the registration under the
Securities Act of the Senior Notes, except under limited circumstances. See
"Description of the Exchange Notes--Exchange Offer; Registration Rights." No
assurance can be given as to the liquidity of either the Senior Notes or the
Exchange Notes.
 
  THIS PROSPECTUS AND THE RELATED LETTER OF TRANSMITTAL CONTAIN IMPORTANT
INFORMATION. HOLDERS OF SENIOR NOTES ARE URGED TO READ THIS PROSPECTUS AND THE
RELATED LETTER OF TRANSMITTAL CAREFULLY BEFORE DECIDING WHETHER TO TENDER
THEIR SENIOR NOTES PURSUANT TO THE EXCHANGE OFFER.
 
  Senior Notes may be tendered for exchange prior to 5:00 p.m., New York City
time, on     , 1998 (such time on such date being hereinafter called the
"Expiration Date"), unless the Exchange Offer is extended by the Company (in
which case the term "Expiration Date" shall mean the latest date and time to
which the Exchange Offer is extended). See "The Exchange Offer--Expiration
Date; Extensions; Amendments." Tenders of Senior Notes may be withdrawn at any
time prior to the Expiration Date. The Exchange Offer is not conditioned upon
any minimum aggregate principal amount of Senior Notes being tendered for
exchange. The Exchange Offer is, however, subject to certain events and
conditions and to the terms of the Registration Agreement. Senior Notes may be
tendered only in integral multiples of aggregate stated principal amount at
maturity of $1,000. The Company has agreed to pay all expenses of the Exchange
Offer. This Prospectus, together with the Letter of Transmittal, is being sent
to all registered holders of Senior Notes as of     , 1998.
 
  The Company will not receive any cash proceeds from the issuance of the
Exchange Notes offered hereby. No underwriter is being used in connection with
the Exchange Offer. See "Use of Proceeds" and "Plan of Distribution."
 
                               ----------------
 
  The Company has registered or applied to register the following trademarks
which may appear in this Prospectus: Focal(TM) and its logo, Focal
Communications Corporation(TM), Focused on Local Communications(TM),
Functionally Equivalent, Technically Superior, Low Cost(TM), The Third
Generation CLEC(TM), and Multi-Exchange Service(TM).
 
                               ----------------
 
  Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these
securities in any state in which such offer, solicitation or sale would be
unlawful prior to registration or qualification under the securities laws of
any such state.
 
                                       3
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following is a summary of certain information contained elsewhere in this
Prospectus. Reference is made to, and this Summary is qualified in its entirety
by, the more detailed information, including the Company's Consolidated
Financial Statements and notes thereto, contained herein. Unless otherwise
indicated, references to "Focal" or the "Company" include Focal Communications
Corporation, a Delaware corporation, and its consolidated subsidiaries.
 
                                  THE COMPANY
 
  Focal began operations during 1996 and has operated in Chicago since May 1997
and New York since January 1998, currently serving a total of 6 MSAs
(metropolitan statistical areas). The Company plans to offer services in 37
additional MSAs by the end of 1999, reaching a total of 43 MSAs in ten
metropolitan markets. As of March 31, 1998, the Company had 21,082 access lines
sold, of which 14,528 were installed and in service. This compares to 13,411
lines sold and 7,394 lines installed as of December 31, 1997.
 
FOCAL'S NETWORK
 
  The Company has chosen to pursue a network design approach which involves
purchasing and maintaining its own switches while leasing fiber optic
transmission facilities on an incremental basis as demand dictates. This
approach is made possible by the availability of fiber optic transmission
facilities from multiple vendors in each of the markets it serves or intends to
serve. The Company's network design allows it to (i) reduce the capital
investments necessary to provide services to its customers by focusing capital
expenditures on switches and related technology (the most critical component of
its network), (ii) avoid the construction of fiber optic facilities and the
"stranded" capital sometimes associated with such construction, (iii) better
match the commitment of capital to the acquisition of revenue generating
customers and (iv) generate revenue and cash flow more quickly than if the
Company constructed its own fiber optic transmission facilities. The Company
leases transmission facilities from at least three vendors in each market in
which it conducts business, providing the Company with added negotiating
leverage and allowing the Company to offer its customers enhanced redundancy
and diversity. To satisfy the needs of its high-volume corporate customer base
the Company has engineered its network to be virtually non-blocking, thereby
maximizing call completion.
 
FOCAL'S MARKETS
 
  Focal selects its target geographical markets based on several primary
criteria: sufficient market size; favorable state regulatory environment; the
pre-existence of well-developed interconnection agreements and processes with
the incumbent local exchange carrier ("ILEC"); and the existence of multiple
fiber providers with extensive networks. Based primarily on these factors, the
Company began offering service in Chicago and New York and intends to expand
into eight additional Tier I metropolitan markets by the end of 1999,
including: Los Angeles, San Francisco, Washington, D.C., Philadelphia, Boston,
Detroit, Miami and Seattle. Focal expects to generate incremental business from
its existing customer base as it expands into new markets. Many of the
Company's existing customers have operations in Focal's targeted cities and the
Company believes the opportunity to leverage its relationships with these
customers is significant. Management estimates total expenditures for local
telecommunications service in the business segment for its ten target markets
to be approximately $12.2 billion per year.
 
  The Company believes a significant demand for its services exists because the
telecommunications-intensive users in Tier I markets are inadequately served
with regard to highly reliable, local switched telecommunications services. The
Company believes that large telecommunications-intensive users will
increasingly demand diversity in providers of local telecommunications service
as they have already done in long distance and private-
 
                                       1
<PAGE>
 
line telecommunications services. Most second generation CLECs initially chose
to compete in Tier II and Tier III markets, effectively ceding the Tier I
markets to the first generation CLECs (i.e., MFS Communications Company, Inc.
("MFS") and Teleport Communications Group ("TCG")). Moreover, the vast majority
of CLECs, both first and second generation, have more expertise in providing
leased transport facilities, as opposed to switched services, and provide
bundled communications services to small and medium sized business customers.
Focal is The Third Generation CLEC(TM) that focuses on providing value-added,
switched local services to large telecommunications-intensive users in Tier I
markets. Management believes that the Company's focus on providing a limited
number of services to a defined market allows it to outperform its competitors
in terms of service quality, reliability, and responsiveness.
 
MANAGEMENT AND SPONSORSHIP
 
  Focal believes that its management and operations team is a critical
component of its initial success and will continue to be a key element of
differentiation. The Company has built a skilled and experienced management
team headed by the Company's Chief Executive Officer, Robert C. Taylor, Jr.,
and Chief Operating Officer, John R. Barnicle, who were most recently senior
executives at MFS. Overall, the founding management team has extensive prior
work experience at well known ILECs, CLECs and other telecommunications
companies. See "Management." Furthermore, Madison Dearborn Capital Partners,
L.P. ("MDCP"), Frontenac VI, L.P. ("Frontenac") and Battery Ventures III, L.P.
("Battery," with MDCP, Frontenac and Battery being hereinafter sometimes
individually referred to as an "Equity Investor" and collectively referred to
as the "Equity Investors") have invested, together with management and certain
other investors, an aggregate of $26.1 million of equity in the Company. As a
result of such investments, the Equity Investors own, in the aggregate,
approximately 80% of the Company's outstanding equity and each Equity Investor
has appointed one or more representatives to the Company's board of directors.
See "Security Ownership of Certain Beneficial Owners and Management."
 
                                    STRATEGY
 
  The Company's objective is to become the local provider of choice to
telecommunications-intensive customers in Tier I markets. Key strategies in the
development and fulfillment of the Company's objective are discussed below.
 
BUSINESS STRATEGY
 
  Principal Focus on Local Service. The Company offers a focused set of value-
added local switched services to its customers, which management believes
differentiates the Company from a majority of competitors who are seeking to
provide "one-stop" telecommunications services. See "Business--Business
Strategy."
 
  Design and Install a Highly Capital-Efficient Network. Management believes
the Company can generate a substantially greater return on invested capital by
concentrating its investment in switching, information, billing and support
systems, while leasing its transport facilities. See "Business--Business
Strategy."
 
  Build a More Robust Network than ILECs or CLECs. The Company has designed and
built its network to meet the demanding traffic and reliability requirements of
its target customers. Focal utilizes Nortel, DMS-500 SuperNode central office
switches that have been engineered by the Company to be virtually non-blocking,
thereby maximizing call completion. Focal also designs its leased fiber
facilities to avoid blocking. See "Business--Business Strategy."
 
  Minimize Dependence on Deregulation. While the Telecommunications Act of 1996
(the "Telecom Act") is likely to benefit CLECs in the long-term, Focal believes
the tangible benefits from the Telecom Act are limited in the short-term.
Accordingly, Focal's business strategy allows it to minimize its reliance on
provisions of the Telecom Act to achieve its objectives. See "Business--
Business Strategy."
 
                                       2
<PAGE>
 
 
MARKETING STRATEGY
 
  Penetrate Corporate Accounts. The Company emphasizes the diversity,
reliability and sophistication of its network and services in order to earn its
selection as the local provider of choice for its customers. Focal has
developed a number of products and services which it believes provide it with a
competitive advantage when attempting to penetrate new corporate accounts,
including Focal Virtual Office and 800 service. See "Business--Products and
Services." See "Business--Business Strategy."
 
  Take Advantage of the Significant and Growing ISP Opportunity. The dramatic
increase in dial-up access to the Internet has created a particularly strong
demand for local access lines by ISPs. CLECs are generally well-positioned to
satisfy this demand as the only alternative source of access lines. Focal
offers advantages to ISPs that certain of its competitors are currently unable
to provide, such as environmentally conditioned colocation space, virtually
non-blocking switching and transport facilities, guaranteed installation times
and modified foreign exchange service (which allows certain calls which would
otherwise be toll calls to be made as local calls). See "Business--Business
Strategy."
 
  Maximize Network Utilization through VAR and Other Wholesale Arrangements. To
further maximize network utilization while minimizing cost of sales, Focal
distributes service to other customer segments through VARs and other wholesale
arrangements. See "Business--Business Strategy."
 
                                ----------------
 
  The Company's principal executive offices are located at 200 North LaSalle
Street, Suite 800, Chicago, Illinois 60601 and its phone number is (312) 895-
8400.
 
                                       3
<PAGE>
 
 
                               THE EXCHANGE OFFER
 
The Exchange Offer........  Up to $270,000,000 aggregate stated principal
                            amount at maturity of Exchange Notes are being
                            offered in exchange for a like aggregate principal
                            amount at maturity of Senior Notes. Senior Notes
                            may be tendered for exchange in whole or in part in
                            integral multiples of $1,000 stated principal
                            amount at maturity. The Company is making the
                            Exchange Offer in order to satisfy its obligations
                            under the Registration Agreement relating to the
                            Senior Notes. For a description of the procedures
                            for tendering Senior Notes, see "The Exchange
                            Offer--Procedures for Tendering Senior Notes."
 
Expiration Date...........  5:00 p.m., New York City time, on     , 1998 unless
                            the Exchange Offer is extended by the Company (in
                            which case the term "Expiration Date" shall mean
                            the latest date and time to which the Exchange
                            Offer is extended). See "The Exchange Offer--
                            Expiration Date; Extensions; Amendments."
 
Conditions to the           The Exchange Offer is subject to certain
 Exchange Offer...........  conditions, which may be waived by the Company in
                            its sole discretion. The Exchange Offer is not
                            conditioned upon any minimum aggregate principal
                            amount at maturity of Senior Notes being tendered.
                            See "The Exchange Offer--Conditions to the Exchange
                            Offer."
 
                            The Company reserves the right in its sole and
                            absolute discretion, subject to applicable law, at
                            any time and from time to time: (i) to delay the
                            acceptance of the Senior Notes; (ii) to terminate
                            the Exchange Offer if certain specified conditions
                            have not been satisfied; (iii) to extend the
                            Expiration Date of the Exchange Offer and retain
                            all Senior Notes tendered pursuant to the Exchange
                            Offer, subject, however, to the right of holders of
                            Senior Notes to withdraw their tendered Senior
                            Notes; and (iv) to waive any condition or otherwise
                            amend the terms of the Exchange Offer in any
                            respect. See "The Exchange Offer--Expiration Date;
                            Extensions; Amendments."
 
Withdrawal Rights.........  Tenders of Senior Notes may be withdrawn at any
                            time prior to the Expiration Date by delivering a
                            written notice of such withdrawal to the Exchange
                            Agent (as defined herein) in conformity with
                            certain procedures as set forth below under "The
                            Exchange Offer--Withdrawal Rights."
 
Procedures for Tendering
 Senior Notes.............  Tendering holders of Senior Notes must complete and
                            sign a Letter of Transmittal in accordance with the
                            instructions contained therein and forward the same
                            by mail, facsimile transmission or hand delivery,
                            together with any other required documents, to the
                            Exchange Agent, either with the Senior Notes to be
                            tendered or in compliance with the specified
                            procedures for guaranteed delivery of Senior Notes.
                            Certain brokers, dealers, commercial banks, trust
                            companies and other nominees may also effect
                            tenders by book-entry transfer. Holders of Senior
                            Notes registered in the name of a broker, dealer,
                            commercial bank, trust company or other nominee are
                            urged to contact such person promptly if they wish
                            to tender Senior Notes pursuant to the Exchange
                            Offer. See "The Exchange Offer--Procedures for
                            Tendering Senior Notes."
 
                                       4
<PAGE>
 
 
                            Letters of Transmittal and certificates
                            representing Senior Notes should not be sent to the
                            Company. Such documents should only be sent to the
                            Exchange Agent. Questions regarding how to tender
                            and requests for information should be directed to
                            the Exchange Agent. See "The Exchange Offer--
                            Exchange Agent."
 
Resales of Exchange         Based on interpretations by the staff of the
 Notes....................  Commission, as set forth in no-action letters
                            issued to third parties unrelated to the Company
                            (e.g., Exxon Capital Holdings Corporation, publicly
                            available May 13, 1988; K-III Communications
                            Corporation, publicly available May 14, 1993; Brown
                            & Wood LLP, publicly available February 7, 1997;
                            Warnaco, Inc., publicly available October 2, 1991;
                            and Mary Kay Cosmetics, Inc., publicly available
                            June 5, 1991), the Company believes that holders of
                            Senior Notes (other than any holder that is (i) a
                            broker-dealer that acquired Senior Notes as a
                            result of market-making activities or other trading
                            activities, or (ii) a broker-dealer that acquired
                            Senior Notes directly from the Company for resale
                            pursuant to Rule 144A or another available
                            exemption under the Securities Act) who exchange
                            their Senior Notes for Exchange Notes pursuant to
                            the Exchange Offer may offer for resale, resell and
                            otherwise transfer such Exchange Notes without
                            compliance with the registration and prospectus
                            delivery provisions of the Securities Act, provided
                            that such Exchange Notes are acquired in the
                            ordinary course of such holders' business, such
                            holders have no arrangement or understanding with
                            any person to participate in the distribution of
                            such Exchange Notes and such holders are not
                            "affiliates" of the Company (within the meaning of
                            Rule 405 under the Securities Act). However, the
                            staff of the Commission has not considered the
                            Exchange Offer in the context of a no-action
                            letter, and there can be no assurance that the
                            staff of the Commission would make a similar
                            determination with respect to the Exchange Offer.
                            Each broker-dealer that receives Exchange Notes for
                            its own account in exchange for Senior Notes, where
                            such Senior Notes were acquired by such broker-
                            dealer as a result of market-making activities or
                            other trading activities, must acknowledge that it
                            will deliver a prospectus in connection with any
                            resale of such Exchange Notes. See "Plan of
                            Distribution."
 
Exchange Agent............  The exchange agent with respect to the Exchange
                            Offer is Harris Trust and Savings Bank (the
                            "Exchange Agent"). The address, telephone number
                            and facsimile number of the Exchange Agent are set
                            forth in "The Exchange Offer--Exchange Agent" and
                            in the Letter of Transmittal.
 
Use of Proceeds...........  The Company will not receive any cash proceeds from
                            the issuance of the Exchange Notes offered hereby.
                            See "Use of Proceeds."
 
Certain United States
 Federal Income Tax         The exchange of the Exchange Notes for the Senior
 Considerations...........  Notes will not be a taxable exchange for U.S.
                            federal income tax purposes, and holders of Senior
                            Notes should not recognize any taxable gain or loss
                            of any interest income as a result of such
                            exchange. See "Certain United States Federal Income
                            Tax Considerations--The Exchange."
 
                                       5
<PAGE>
 
 
                               THE EXCHANGE NOTES
 
Securities Offered........  $270,000,000 aggregate stated principal amount at
                            maturity of 12.125% Senior Discount Notes due
                            February 15, 2008. The terms of the Exchange Notes
                            will be identical in all material respects to the
                            terms of the Senior Notes, except that (i) the
                            Exchange Notes will have been registered under the
                            Securities Act and therefore will not be subject to
                            certain restrictions on transfer applicable to the
                            Senior Notes and (ii) holders of the Exchange Notes
                            will not be entitled to certain rights of holders
                            of the Senior Notes under the Registration
                            Agreement. The Exchange Notes will evidence the
                            same debt as the Senior Notes and will be issued
                            pursuant to and entitled to the benefits of the
                            Indenture.
 
Issue Price...............  $555.6578 per $1,000 stated principal amount at
                            maturity.
 
Maturity..................  February 15, 2008.
 
Yield and Interest........  12.125% per annum (computed on a semiannual bond
                            equivalent basis). In the period prior to February
                            15, 2003, interest will accrue but will not be
                            payable in cash. From February 15, 2003, interest
                            on the stated principal amount at maturity of the
                            Notes will be payable in cash semiannually on
                            August 15 and February 15 of each year, beginning
                            on August 15, 2003. See "Description of the
                            Exchange Notes."
 
Original Issue Discount...  For U.S. federal income tax purposes, the Exchange
                            Notes will be considered to bear original issue
                            discount ("OID"). Although Current Interest on the
                            Notes will not be payable prior to August 15, 2003,
                            a U.S. Holder (as defined herein) of Exchange Notes
                            will be required to include OID in such holder's
                            gross income for U.S. federal income tax purposes
                            in advance of receipt of the cash payments to which
                            the income is attributable. See "Certain United
                            States Federal Income Tax Considerations."
 
Ranking...................  The Exchange Notes will be senior unsecured
                            obligations of the Company ranking pari passu in
                            right of payment with the Senior Notes and all
                            other existing and future senior indebtedness of
                            the Company, if any, and will rank senior in right
                            of payment to all existing and future subordinated
                            indebtedness of the Company, if any. Holders of
                            secured indebtedness of the Company, however, will
                            have claims that are prior to the claims of the
                            holders of the Exchange Notes with respect to the
                            assets securing such other indebtedness. As of
                            March 31, 1998, the Company had no outstanding
                            indebtedness other than the Notes. The Exchange
                            Notes will be effectively subordinated to all
                            existing and future indebtedness and other
                            liabilities of the Company's subsidiaries
                            (including trade payables). See "Description of the
                            Exchange Notes--Ranking."
 
Optional Redemption.......  The Exchange Notes will be redeemable, at the
                            Company's option, in whole or in part, at any time
                            or from time to time, on or after February
 
                                       6
<PAGE>
 
                            15, 2003, at 106.063% of their stated principal
                            amount at maturity, plus accrued and unpaid Current
                            Interest, declining ratably to 100% of their stated
                            principal amount at maturity, plus accrued and
                            unpaid Current Interest, on or after 2006. In
                            addition, at any time and from time to time, prior
                            to February 15, 2001, the Company may redeem in the
                            aggregate up to 35% of the original aggregate
                            stated principal amount at maturity of the Exchange
                            Notes with the proceeds from one or more Public
                            Equity Offerings following which there is a Public
                            Market, at a redemption price (expressed as a
                            percentage of Accreted Value on the redemption
                            date) of 112.125%, plus Additional Interest, if
                            any; provided that at least 65% of the original
                            aggregate stated principal amount at maturity of
                            the Exchange Notes remains outstanding after each
                            such redemption. See "Description of the Exchange
                            Notes--Optional Redemption."
 
Change of Control.........  Upon the occurrence of a Change of Control (as
                            defined herein), each holder of Exchange Notes will
                            have the right to require the Company to repurchase
                            all or any part of such holder's Exchange Notes
                            pursuant to a Change of Control Offer (as defined
                            herein) at a purchase price equal to 101% of the
                            Accreted Value thereof plus accrued and unpaid
                            Current Interest, if any, to but excluding the
                            repurchase date. If a Change of Control Offer is
                            made, there can be no assurance that the Company
                            will have sufficient funds to pay the Change of
                            Control Purchase Price for all Exchange Notes
                            tendered by holders seeking to accept the Change of
                            Control Offer. Upon the occurrence of a Change of
                            Control, if after giving effect to a Change of
                            Control Offer at least 95% of the original
                            aggregate stated principal amount at maturity of
                            the Exchange Notes has been redeemed or
                            repurchased, the Company shall have the right to
                            redeem the balance of the Exchange Notes at a
                            redemption price equal to 101% of the Accreted
                            Value thereof plus accrued and unpaid Current
                            Interest, if any, to but excluding the Change of
                            Control Redemption Date (as defined herein). See
                            "Description of the Exchange Notes--Repurchase at
                            the Option of Holders upon a Change of Control."
 
Certain Covenants.........  The Indenture contains certain covenants which,
                            among other things, restrict the ability of the
                            Company and certain of its subsidiaries to incur
                            additional indebtedness (and, in the case of
                            certain subsidiaries, issue preferred stock), pay
                            dividends or make distributions in respect of the
                            Company's or such subsidiaries' capital stock, make
                            other restricted payments, enter into sale and
                            leaseback transactions, incur liens, cause
                            encumbrances or restrictions to exist on the
                            ability of certain subsidiaries to pay dividends or
                            make distributions in respect of their capital
                            stock, issue and sell capital stock of certain
                            subsidiaries, enter into transactions with
                            affiliates, sell assets, or amalgamate,
                            consolidate, merge or sell or otherwise dispose of
                            all or substantially all of their property and
                            assets. These covenants are subject to important
                            exceptions and qualifications. See "Description of
                            the Exchange Notes--Certain Covenants."
 
  For additional information regarding the Exchange Notes, see "Description of
the Exchange Notes."
 
                                       7
<PAGE>
 
 
                                USE OF PROCEEDS
 
  The Company will not receive any cash proceeds from the issuance of the
Exchange Notes offered hereby. However, upon the original issuance of the
Senior Notes, the net proceeds received by the Company, after deducting the
discount to the Initial Purchasers and other expenses payable by the Company,
was approximately $144 million. The Company used or will use the net proceeds
(i) to fund the cost of acquiring and installing telecommunications switches
and related infrastructure, (ii) to fund operating losses, (iii) to repay
approximately $3.5 million principal amount of outstanding indebtedness of a
subsidiary, (iv) for potential, selected acquisitions (although none have been
negotiated or contemplated), and (v) for general corporate purposes. Prior to
using the net proceeds for such purposes, the Company has invested the net
proceeds in short-term money market and other market-rate, investment-grade
instruments. See "Management's Discussion and Analysis of Financial Condition
and Results of Operations--Liquidity and Capital Resources" and "Use of
Proceeds."
 
                                  RISK FACTORS
 
  POTENTIAL PARTICIPANTS IN THE EXCHANGE OFFER SHOULD CONSIDER CAREFULLY
CERTAIN FACTORS SET FORTH UNDER THE CAPTION "RISK FACTORS." SEE "RISK FACTORS."
These risk factors are generally applicable to the Senior Notes as well as the
Exchange Notes.
 
                                       8
<PAGE>
 
               SUMMARY CONSOLIDATED FINANCIAL AND OPERATING DATA
 
  The summary consolidated financial data presented below as of and for the
seven month period ended December 31, 1996, and the year ended December 31,
1997, have been derived from the Consolidated Financial Statements of the
Company, and the notes related thereto, included elsewhere in this Prospectus.
The Financial Statements of the Company for the seven month period ended
December 31, 1996 and for the year ended December 31, 1997 have been audited by
Arthur Andersen LLP, independent auditors. The summary financial data for the
three month periods ended March 31, 1997 and 1998 have been derived from the
unaudited financial statements of the Company which, in the opinion of
management, include all adjustments, consisting of normal recurring
adjustments, necessary for a fair presentation of the financial condition and
results of operations for the Company for such periods. The results of
operations for interim periods are not necessarily indicative of a full year's
operations. The following information should be read in conjunction with
"Capitalization," "Management's Discussion and Analysis of Financial Condition
and Results of Operations," "Business" and the Consolidated Financial
Statements of the Company and the notes related thereto, and the other
financial data appearing elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                            PERIOD FROM
                           COMMENCEMENT
                           OF OPERATIONS                    THREE MONTHS ENDED
                         (MAY 31, 1996) TO  YEAR ENDED   -------------------------
                           DECEMBER 31,    DECEMBER 31,   MARCH 31,    MARCH 31,
                               1996            1997         1997          1998
                         ----------------- ------------  -----------  ------------
                                                         (UNAUDITED)  (UNAUDITED)
<S>                      <C>               <C>           <C>          <C>
STATEMENT OF OPERATIONS
 DATA:
Revenue.................    $      --      $  4,023,690  $       --   $  5,102,448
Expenses:
 Customer service and
  network operations....           --         2,154,980        8,697     1,826,893
 Selling, general
  and administrative....       421,777        2,887,372      416,492     1,307,625
 Depreciation and
  amortization..........         1,150          615,817        7,337       890,871
                            ----------     ------------  -----------  ------------
Operating income
 (loss).................      (422,927)      (1,634,479)    (432,526)    1,077,059
Interest income
 (expense), net.........        17,626           67,626       42,925    (1,093,250)
                            ----------     ------------  -----------  ------------
Net income (loss).......    $ (405,301)    $ (1,566,853) $  (389,601) $    (16,191)
                            ==========     ============  ===========  ============
<CAPTION>
                                           DECEMBER 31,   MARCH 31,    MARCH 31,
                         DECEMBER 31, 1996     1997         1997          1998
                         ----------------- ------------  -----------  ------------
                                                         (UNAUDITED)  (UNAUDITED)
<S>                      <C>               <C>           <C>          <C>
BALANCE SHEET DATA:
Current Assets..........    $3,807,004     $  4,737,808  $ 5,069,167  $158,404,803
Fixed Assets, net.......        81,153       11,176,774    2,318,202    18,125,851
Total Assets............     3,888,157       15,914,582    7,387,369   182,228,022
Long-term debt..........           --         3,536,886          --    152,093,513
Redeemable Class A Com-
 mon Stock(1)...........     4,024,653       12,403,218    8,024,653           --
Total stockholders' eq-
 uity (deficit).........      (404,954)      (2,075,372)   7,230,097    24,111,655
OTHER FINANCIAL DATA:
EBITDA(2)...............    $ (421,777)    $ (1,018,662) $  (425,189) $  1,967,930
Capital expenditures....        82,303       11,655,524    2,244,385     7,593,061
Deficiency of earnings
 to fixed charges(3)....       405,301        1,566,853      389,601        16,191
SUMMARY CASH FLOW DATA:
Net cash provided by
 (used in) operating
 activities.............    $ (152,576)    $ (1,634,017) $  (522,595) $  3,745,255
Net cash used in
 investing activities...       (82,303)     (11,655,524)  (2,244,385)  (13,537,316)
Net cash provided by
 financing activities...     4,025,000       11,755,972    3,999,514   160,294,453
OPERATING DATA:
Access lines in
 service(4).............           --             7,394          --         14,528
Minutes of use
 (millions).............           --             281.7          --          401.6
</TABLE>
 
                                       9
<PAGE>
 
- --------
(1) See "Capitalization" and "Description of Capital Stock."
(2) EBITDA represents earnings before interest, income taxes, depreciation and
    amortization. EBITDA is not a measurement of financial performance under
    generally accepted accounting principles, is not intended to represent cash
    flow from operations, and should not be considered as an alternative to net
    loss as an indicator of the Company's operating performance or to cash
    flows as a measure of liquidity. The Company believes that EBITDA is widely
    used by analysts, investors and other interested parties in the
    telecommunications industry. EBITDA is not necessarily comparable with
    similarly titled measures for other companies. See "Consolidated Statements
    of Cash Flows."
(3) The ratio of earnings to fixed charges is calculated by dividing (i) income
    (loss) before provision for income taxes, plus fixed charges by (ii) fixed
    charges. Fixed charges consist of interest on indebtedness, plus the
    estimated component of rental expense deemed by the Company to be
    representative of the interest factor.
(4) Represents the number of access lines in service (at a DSO level) and
    excludes the signaling channel of primary rate ISDN-based connections.
 
                                       10
<PAGE>
 
                                 RISK FACTORS
 
  In addition to the other information contained in this Prospectus, holders
of Senior Notes should carefully consider the risk factors set forth below
before tendering their Senior Notes for Exchange Notes.
 
LIMITED HISTORY OF OPERATIONS; NEGATIVE CASH FLOW
 
  The Company began operations in May 1996. Accordingly, prospective
participants in the Exchange Offer have limited historical financial
information about the Company upon which to base an evaluation of the
Company's performance. Given the Company's limited operating history, there is
no assurance that it will be able to generate sufficient cash flow to service
its debt obligations (including the Senior Notes and the Exchange Notes) or to
compete successfully in the telecommunications business.
 
  The development of the Company's businesses and the acquisition,
installation and expansion of its networks require significant expenditures, a
portion of which are made before any revenues may be realized. Such capital
expenditures are expected to increase as the Company grows its customer base
in existing markets and expands into additional markets. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations--
Liquidity and Capital Resources" and "Business--Market Potential." These
expenditures, together with the associated early service costs, will result in
negative cash flow and operating losses until an adequate revenue base may be
established. There can be no assurance that an adequate revenue base will be
established. Management believes the Company may produce negative consolidated
cash flow for a period of at least 18 months from the date of this Prospectus.
The Company will continue to make expenditures in connection with the
acquisition, development and expansion of its networks, services and customer
base. There can be no assurance that the Company will achieve or sustain
profitability or generate sufficient cash flow to service its debt obligations
(including the Senior Notes and the Exchange Notes), to meet working capital
requirements or to compete successfully in the telecommunications business.
See "Management's Discussion and Analysis of Financial Condition and Results
of Operations."
 
SUBSTANTIAL LEVERAGE; ABILITY TO SERVICE INDEBTEDNESS
 
  The Company is highly leveraged following the issuance of the Notes. As of
March 31, 1998, the Company had no outstanding indebtedness other than the
Notes. The Indenture permits, subject to certain conditions, the incurrence of
additional indebtedness. The Company may incur substantial additional
indebtedness (including secured indebtedness) following the issuance of the
Senior Notes and Exchange Notes for the construction or acquisition and
expansion of networks, the purchase of transmission and switching equipment,
and the introduction of new service offerings. See "--Future Capital
Requirements," and "--Holding Company Structure; Effective Subordination of
the Exchange Notes."
 
  The Company's ability to make principal and interest payments on the Notes
will be dependent upon, among other things, the Company's future operating
performance and anticipated cash flow and its ability to obtain additional
debt or equity financing. Factors affecting the ability of the Company to
achieve the foregoing include prevailing economic, financial, competitive and
regulatory conditions and other factors affecting the Company's business and
operations, including the Company's ability to implement its business strategy
in new markets on a timely and cost-effective basis. There can be no assurance
that the Company will have adequate sources of liquidity to make required
payments of principal and interest on its indebtedness (including the Notes),
whether at or prior to maturity, finance anticipated capital expenditures and
fund working capital requirements. If the Company does not have sufficient
available resources to repay its outstanding indebtedness when it becomes due
and payable, the Company may find it necessary to refinance such indebtedness;
there can be no assurance however that refinancing will be available, or if
available, that it will be available on reasonable terms. Any failure by the
Company to satisfy its obligations with respect to its indebtedness at
maturity or prior thereto would constitute a default under such indebtedness
and could cause a default under agreements governing other
 
                                      11
<PAGE>
 
indebtedness, if any, of the Company. Such defaults could result in a default
under the Indenture and could delay or preclude payment of interest or
principal on the Notes. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources." If the
Company were unable to obtain adequate financing or refinancing on
satisfactory terms, it would have to consider various other options such as
the sale of certain assets or additional equity to meet its debt service
requirements or other options available to it under law. There can be no
assurance that such options would be permitted under the terms of the
Company's indebtedness or other agreements or that such options would be
available on terms acceptable to the Company, if at all. See "Description of
the Exchange Notes--Certain Covenants."
 
  The Company's high degree of leverage could have important consequences,
including: (i) a substantial portion of the Company's sources of capital and
cash flow from operations must be dedicated to debt service payments, thereby
reducing the funds available to the Company for other purposes; (ii) the
Company's ability to obtain additional debt financing in the future for
working capital, capital expenditures, acquisitions, repayment of indebtedness
or other purposes may be impaired, whether as a result of the covenants and
other terms of its debt instruments or otherwise; (iii) the Company is
substantially more leveraged than certain of its competitors, which may place
the Company at a competitive disadvantage; (iv) the Company's high degree of
leverage may limit its ability to expand capacity and otherwise meet its
growth objectives; and (v) the Company's high degree of leverage may hinder
its ability to adjust rapidly to changing market conditions and could make it
more vulnerable in the event of a downturn in general economic conditions or
its business. In addition, the Company's operating and financial flexibility
is limited by the Indenture and may be limited by covenants contained in
agreements governing future indebtedness of the Company and its subsidiaries.
Such covenants will impose significant operating and financial restrictions on
the Company and its subsidiaries and will restrict, limit or prohibit, among
other things, the ability of the Company and its subsidiaries to incur
additional indebtedness, pay dividends, repay indebtedness prior to its stated
maturity, sell assets, make investments, engage in transactions with
affiliates, create liens or engage in mergers or acquisitions. There can be no
assurance that such covenants will not adversely affect the Company's ability
to finance its future operations or capital needs or to engage in other
business activities which may be in the interest of the Company. See
"Description of the Exchange Notes."
 
FUTURE CAPITAL REQUIREMENTS
 
  Expansion of the Company's existing networks and services, the acquisition
and development of new networks and services and the funding of initial
operating losses will require significant capital expenditures. The Company
plans to have operations in ten cities by the end of 1999. The Company
currently intends to fund the expansion of its networks and the deployment of
switches in all of such networks with full capabilities for local dial tone
and switched access termination and origination services with its existing
cash balances and the net proceeds of additional financings, if required. See
"Use of Proceeds." If the Company requires additional capital to complete the
planned build out of its networks, or if customer demand in such markets
exceeds current expectations, the Company's funding needs may increase. In
addition, the Company will continue to evaluate additional revenue
opportunities in each of its markets and, as attractive additional
opportunities may develop, the Company plans to make additional capital
investments in its networks that might be required to pursue such
opportunities. The Company expects to meet such additional capital needs with
additional borrowings under credit facilities, proceeds from the sale of
additional debt or equity securities and joint ventures. The Company's network
design strategy of leasing its transmission facilities may result in EBITDA
(as defined in footnote 2 on page 10) levels lower than other CLECs that own
their transport facilities. Such differences may, in the absence of other
factors that management believes should increase its EBITDA (as defined in
footnote 2 on page 10) relative to its competitors, make it more difficult for
the Company to obtain debt financing relative to other CLECs of similar size.
There can be no assurance, however, that the Company will be successful in
raising sufficient additional debt or equity capital on terms that it will
consider acceptable or that the Company's operations will produce cash flow in
sufficient amounts. Failure to raise and generate sufficient funds may require
the Company to delay or abandon some of its planned future expansion or
expenditures, which could have a material adverse effect on the Company's
growth and its ability to compete in the telecommunications industry.
 
                                      12
<PAGE>
 
The Company's expectations of required future capital expenditures are based
on the Company's current estimates. There can be no assurance that actual
expenditures will not be significantly higher or lower.
 
HOLDING COMPANY STRUCTURE; EFFECTIVE SUBORDINATION OF THE EXCHANGE NOTES
 
  The Company is a holding company which derives all of its revenues from the
operation of its subsidiaries. The holders of the Exchange Notes will have no
direct claim against the subsidiaries for payment under the Exchange Notes. As
such, the Company is dependent upon dividends and other payments from its
subsidiaries to generate the funds necessary to meet its cash obligations,
including the payment of principal and interest on the Exchange Notes. The
ability of the Company to obtain such dividend payments from its subsidiaries
may be limited or restricted by, among other things, the profitability and
cash flow of such subsidiaries, the terms of such subsidiaries' indebtedness
and applicable laws, including state corporate laws which in certain
circumstances limit the ability of a corporation to pay dividends. Although
there are currently no such limitations or restrictions on the Company's
ability to obtain dividend payments from its subsidiaries, future debt
securities, loan agreements or other agreements may contain such limitations
or restrictions. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources."
 
  Claims of creditors of the Company's subsidiaries and holders of preferred
stock of such subsidiaries will have priority as to the assets of such
subsidiaries over the claims of the Company and the holders of the Company's
indebtedness, including the Exchange Notes, except to the extent that such
subsidiaries have provided guarantees of the Company's indebtedness and except
to the extent that loans made by the Company to its subsidiaries are
recognized as indebtedness. Therefore, the Exchange Notes will be effectively
subordinated in right of payment to all existing and future indebtedness and
other liabilities of the Company's subsidiaries, including trade payables. See
"Use of Proceeds" and "Description of the Exchange Notes--Ranking."
 
  The Exchange Notes will be effectively subordinated to any secured
indebtedness of the Company because holders of such indebtedness will have
claims that are prior to the claims of the holders of the Exchange Notes with
respect to the assets securing such indebtedness except to the extent the
Exchange Notes are equally and ratably secured by such assets. As of March 31,
1998, the Company had no outstanding indebtedness other than the Notes. The
Indenture limits, but does not prohibit, the incurrence of certain other
secured and unsecured indebtedness by the Company and its subsidiaries. See
"Description of the Exchange Notes--Certain Covenants--Limitation on
Consolidated Indebtedness." See also "Management's Discussion and Analysis of
Financial Condition and Results of Operations--Liquidity and Capital
Resources."
 
IMPLEMENTATION OF GROWTH STRATEGY
 
  The expansion and development of the Company's operations will depend, among
other things, on the Company's ability to assess markets, install and operate
switches, recruit and hire personnel, install facilities, implement and
improve its operating and administrative systems and obtain any required
government authorizations, franchises and permits, all in a timely manner, at
reasonable costs and on satisfactory terms and conditions. As a result, there
can be no assurance that the Company will be able successfully to expand its
existing networks or acquire or develop new networks in a timely manner in
accordance with its strategic objectives. As a result of the Company's
strategy to achieve rapid growth, the operating complexity of the Company may
increase. The Company's ability to manage its expansion effectively will
depend on, among other things, the expansion, training and management of the
Company's employee base and the Company's successful development of
operational, financial and management plans, systems and controls. Given the
Company's limited operating history, there can be no assurance that the
Company will be able to satisfy these requirements or otherwise manage its
growth effectively. Such failures could have a material adverse effect on the
Company's financial condition. See "Business."
 
  An essential element of the Company's strategy is the provision of switched
local service. There can be no assurance that the installation of the required
switches and associated electronics necessary to implement the Company's
business plan will continue to be completed on time or that, during the
testing of these switches and related equipment, the Company will not
experience technological problems that cannot be resolved. The failure of the
Company to install and operate successfully additional switches and other
network equipment could have a material adverse effect upon the Company's
ability to enter additional markets.
 
                                      13
<PAGE>
 
  The Company has agreements for the interconnection of its networks with the
networks of the ILEC covering each market in which it is currently operating.
The U.S. Court of Appeals for the Eighth Circuit vacated Federal
Communications Commission ("FCC") rules governing, among other things, pricing
in interconnection agreements and providing "most favored nation" treatment.
This decision has been appealed to the Supreme Court, and the Supreme Court
has granted certiorari. The outcome of those appeals cannot be predicted at
this time. The Eighth Circuit decision creates uncertainty about the rules
governing pricing, terms and conditions of interconnection agreements, and
could make negotiation and enforcement of such agreements more difficult and
protracted, and may require renegotiation of existing agreements. There can be
no assurance that the Company will successfully negotiate such other
agreements for interconnection with the ILEC or renewals of existing
interconnection agreements. The failure to negotiate required interconnection
agreements could have a material adverse effect upon the Company's ability to
enter additional markets. See "--Regulation."
 
  The Company has developed processes and procedures in the implementation of
customer orders for services, the provisioning, installation and delivery of
such services and monthly billing for those services. In connection with its
development of a comprehensive information technology platform, the Company is
developing automated internal systems for processing customer orders,
provisioning and billing. The failure to develop effective internal processes
and systems for these service elements could have a material adverse effect
upon the Company's ability to achieve its growth strategy.
 
COMPETITION
 
  In each of the cities anticipated to be served by the Company's networks,
the services offered by the Company compete or will compete principally with
the services offered by the ILEC serving that area. ILECs have long-standing
relationships with their customers, have the potential to subsidize
competitive services from monopoly service revenues and benefit from favorable
state and federal regulations. While the FCC's interconnection decisions and
the Telecom Act provide increased business opportunities to CLECs such as the
Company, they also provide the ILECs with increased pricing flexibility for
their services and other regulatory relief, which could have a material
adverse effect on CLECs, including the Company. If the ILECs are allowed by
regulators to lower their rates for their services, engage in substantial
volume and term discount pricing practices for their customers, or seek to
charge CLECs substantial fees for interconnection to the ILECs' networks, the
income of CLECs, including the Company, could be materially adversely
affected.
 
  ILECs can also adversely affect the pace at which CLECs add new customers by
prolonging the process of providing unbundled network elements, colocations,
intercompany trunks, and operations support system ("OSS") interfaces, which
allow the electronic transfer between ILECs and CLECs of needed information
about customer accounts, service orders and repairs. Although the Telecom Act
requires ILECs to provide the unbundled network elements, interconnections and
OSS interfaces needed to allow the customers of CLECs and other new entrants
to the local exchange market to obtain service comparable to that provided by
the ILECs in terms of installation time, repair response time, billing and
other administrative functions, in many cases the ILECs may not have fully
complied with the mandates of the Telecom Act. In addition, the
interconnection regulations may be affected by the outcome of the pending
Supreme Court review of the Eighth Circuit's decision. See "--Regulation."
 
  The Company also faces, and expects to continue to face, competition from
other current and potential market entrants, including other CLECs,
interexchange carriers ("IXCs"), cable television companies, electric
utilities, microwave carriers, wireless telephone system operators and private
networks built by large end users. A continuing trend toward combinations and
strategic alliances in the telecommunications industry, including potential
consolidation among existing telecommunications providers in the same or
different market segments, or among telephone companies and other types of
companies not currently providing telecommunications services, could give rise
to significant new competition.
 
  The Company believes that various legislative initiatives, including the
Telecom Act, as well as a recent series of completed and proposed transactions
between ILECs, IXCs and cable companies, increase the
 
                                      14
<PAGE>
 
likelihood that barriers to local exchange competition will be removed more
quickly than had earlier been anticipated. The introduction of such
competition, however, also means that the Company may face new or increased
competition from entities who do not currently compete with the Company in any
significant way.
 
  Many of the Company's current and potential competitors have financial,
personnel and other resources substantially greater than those of the Company,
as well as other competitive advantages over the Company. See "Business--
Competition" for more detailed information on the competitive environment
faced by the Company.
 
REGULATION
 
  The Company is subject to varying degrees of federal, state and local
regulation. The Company is not currently subject to price cap or rate of
return regulation, nor is it currently required to obtain FCC authorization
for the installation, acquisition or operation of its network facilities.
While the FCC has determined that non-dominant carriers, such as the Company
and its subsidiaries, should no longer be required to file interstate tariffs,
that decision has been stayed. Thus, carriers currently are required to
continue filing such tariffs for long-distance service. The Company's
subsidiaries that provide intrastate services are also generally subject to
certification and tariff filing requirements by state regulators. Challenges
to these tariffs by third parties could cause the Company to incur substantial
legal and administrative expenses. Although the trend in federal and state
regulation appears to favor increased competition, no assurance can be given
that changes in current or future regulations adopted by the FCC or state
regulators or other legislative or judicial initiatives relating to the
telecommunications industry would not have a material adverse effect on the
Company. In particular, the Company's ability to compete in the segments of
the local exchange market recently opened to CLEC competition depends upon
continued favorable pro-competitive regulatory changes and may be adversely
affected by the greater pricing flexibility and other regulatory relief
granted to ILECs under the Telecom Act. The Company's ability to compete also
may be affected by the recent decision of a U.S. District Court in Texas
(which has been stayed pending appeal) invalidating certain provisions of the
Telecom Act which prohibit the Regional Bell Operating Companies ("RBOCs")
from providing certain services or engaging in other activity until such time
as they have demonstrated that their local market has been opened to
competition. In addition, the Eighth Circuit's decision vacating the FCC's
interconnection pricing rules (which will be reviewed by the United States
Supreme Court during its 1998-99 term) may slow the pace of open competition
initiatives and result in individual states having a more prominent role in
the opening of local exchange markets to competition. Notwithstanding the
uncertainty of the interconnection pricing rules, the Company has in effect or
expects to have in effect interconnection agreements with the ILECs for all of
its operating networks. These agreements are subject to review and approval by
the respective states. While the Company believes its agreements will be
approved, there can be no assurance that the agreements will be approved. In
addition, one or both parties to the agreements may seek to have the
agreements modified based upon the outcome of regulatory and judicial rulings
occurring subsequent to the date of the agreements. There can be no assurances
that the outcome, or any resultant modified agreements, will not adversely
affect the Company. See "Business--Regulation."
 
RELIANCE ON LEASED TRANSPORT FACILITIES AND ILEC INTERCONNECTION
 
  Because the Company has elected to lease transport capacity, it is dependent
upon the availability of fiber optic transmission facilities owned by ILECs,
CLECs and other fiber optic transport providers whose fiber optic networks are
being leased by the Company. The risks inherent in this approach include, but
are not limited to, negotiating and renewing favorable supply agreements, and
timeliness of the ILECs, CLECs or other fiber optic transport providers in
processing the Company's orders for customers who seek to utilize the
Company's service. The Company currently leases a majority of its transport
facilities from WorldCom and, although the Company believes that adequate
alternative sources of transport facilities exist, should WorldCom's
facilities become unavailable it could prove disruptive to the Company's
business. In addition, although the Company believes it has adequate
protection against unexpected increases in the cost of leased transport
facilities, should there be an unexpected material increase in such costs, it
could have a material adverse impact on the Company's results of operations.
 
                                      15
<PAGE>
 
  In addition to transport providers, the Company is reliant on executing
interconnection agreements with the ILECs operating in its target markets. The
Company's interconnection agreements currently provide that the Company's
connection and maintenance orders will receive attention at parity with the
ILECs' customers and the ILEC will provide adequate trunking capacity to keep
blockage within industry standards. Accordingly, the Company and its customers
are dependent on the ILECs to assure uninterrupted service. Blocked calls
result in customer dissatisfaction and risk the loss of Company business.
There can be no assurance ILECs will comply with their network provisioning
requirements. Furthermore, there can be no assurance the rates to be charged
to the Company under the interconnection agreements will allow the Company to
offer low enough usage rates to attract a sufficient number of customers and
to operate the business profitably.
 
RECIPROCAL COMPENSATION FOR INTERNET ACCESS
   
  The Company expects to receive a majority of its initial revenue in a given
market from the ILEC in the form of reciprocal compensation payments. This is
a result of the Company's ISP and corporate customers receiving more calls
than they make due to the initial mix of applications typically sold. Certain
ILECs have refused to pay that portion of reciprocal compensation that they
estimate is the result of inbound ISP traffic since they believe such traffic
to be interstate in nature and not covered under the interconnection
agreements. For example, Illinois Bell Telephone Company ("Ameritech") has
disputed that portion of the reciprocal compensation charges billed to it by
Focal which it believes are related to Internet access services. The Company
has recorded revenues and related accounts receivable totaling $3.2 million
from inception to March 31, 1998 which are the subject of such dispute. On
March 11, 1998, the ICC issued an order stating that Ameritech is required to
pay reciprocal compensation with respect to calls made to ISPs. On March 15,
1998, Ameritech filed a motion with the ICC to stay the order pending an
appeal, which was denied by the ICC on March 23, 1998. On March 27, 1998,
Ameritech filed suit in the United States District Court for the Northern
District of Illinois seeking reversal of the ICC order. Oral arguments in this
matter were held on June 25, 1998. The District Court issued its ruling on
July 21, 1998, affirming the ICC's order requiring Ameritech to pay reciprocal
compensation with respect to calls made to ISPs. The District Court also
continued the ICC's stay order for an additional 35 days. The Company
anticipates that the District Court's decision will be appealed. This dispute
may take an extended time to resolve in the federal court system. Reciprocal
compensation payments from Ameritech currently comprise a majority of the
Company's revenues. As such, the ultimate resolution of this matter in
Ameritech's favor would have a material adverse effect on the Company.     
 
  While some states in which the Company is providing, or proposes to provide,
service have ordered ILECs to pay reciprocal compensation for such calls,
other states have not considered the issue. States which have not considered
the issue could determine that no reciprocal compensation is due with respect
to calls made to ISPs. In addition, the FCC also is considering this matter in
response to a request for a declaratory ruling. There can be no assurance that
the payment of reciprocal compensation for ISP or other traffic types will be
maintained. A change in the type of traffic eligible for reciprocal
compensation payments would have a material adverse effect on the Company. See
"Business--Legal and Administrative Proceedings."
   
  On July 13, 1998, Ameritech filed a complaint with the ICC, alleging that
Focal's Virtual Office service was in violation of the interconnection
agreement and state statute. Ameritech also alleged that due to Focal's
Virtual Office service, Focal was contributing to the exhaustion of numbers in
the 847 area code. Ameritech complained that calls on Focal's Virtual Office
network were circumventing local toll charges, and should not be subject to
reciprocal compensation. Ameritech also claims that the Company is offering
service in violation of the state's pay-per-call rules. The case is set for
hearing before the ICC on September 18, 1998. If the Company were to lose the
case, it could have a material adverse affect on the Company.     
 
CONTROL BY LIMITED NUMBER OF STOCKHOLDERS; POTENTIAL CONFLICT OF INTEREST
 
  The Equity Investors control approximately 80% of the total voting power in
the Company. As a result of such control and pursuant to the terms of certain
agreements among the Company's stockholders, the Equity Investors and the
Company's management will continue to have the ability to effectively control
the future operations of the Company. See "Security Ownership of Certain
Beneficial Owners and Management." Certain decisions concerning the operations
or financial structure of the Company may present a conflict of interest
between the Company's stockholders and the holders of the Exchange Notes. For
example, if the Company encounters financial difficulties or is unable to pay
its debts as they mature, the interest of the Company's
 
                                      16
<PAGE>
 
stockholders may conflict with those of the holders of Exchange Notes. In
addition, these investors may have an interest in pursuing acquisitions,
divestitures, financings or other transactions that, in their judgment could
enhance their equity investment in the Company, even though such transactions
might involve increased risk to the holders of the Exchange Notes. In addition
to their investment in the Company, the Equity Investors or their affiliates
currently have significant investments in other telecommunications companies
and may in the future invest in other entities engaged in the
telecommunications business or in related businesses (including entities
engaged in business in areas in which the Company operates). As a result, the
Equity Investors have, and may develop, relationships with businesses that are
or may be competitive with the Company. In addition, the Company and these
investors have agreed that such investors are under no obligation to bring the
Company any investment or business opportunities of which they become aware,
even if such opportunities are within the primary objectives of the Company.
See "Certain Transactions." Finally, Mr. Crawford, Mr. Finnegan, Mr. Frisbie
and Mr. Perry, each of whom are principals of the Equity Investors and
directors of the Company, also serve as directors of other telecommunications
companies and other private companies. As a result of these additional
directorships, Mr. Crawford, Mr. Finnegan, Mr. Frisbie and Mr. Perry may be
subject to conflicts of interest during their tenure as directors of the
Company. Because of these potential conflicts, Mr. Crawford, Mr. Finnegan, Mr.
Frisbie and Mr. Perry may be required, from time to time, to disclose certain
financial or business opportunities to the Company and to the other companies
to which they owe fiduciary duties. However, the Company does not believe
these conflicts of interest will be a detriment to the Company's growth or
ability to operate its business. Currently the Company does not have any
standard procedures for resolving potential conflicts of interest relating to
corporate opportunities or otherwise.
 
POTENTIAL NEED TO OBTAIN AND MAINTAIN PERMITS AND RIGHTS-OF-WAY
 
  If the Company decides at a later date to acquire and develop its own fiber
optic transmission facilities, the Company may be required to obtain local
franchises and other permits, as well as rights to utilize underground conduit
and pole space and other rights-of-way from entities such as ILECs and other
utilities, railroads, long distance providers, state highway authorities,
local governments and transit authorities. The Telecom Act requires that local
governmental authorities treat telecommunications carriers in a competitively
neutral, non-discriminatory manner, and that most utilities, including most
ILECs and electric companies, afford CLECs access to their poles and conduits
and rights-of-way at reasonable rates on nondiscriminatory terms and
conditions. The failure to enter into and maintain any such required
arrangements for a particular network, including a network which is already
under construction, may affect the Company's ability to develop that network.
See "Business--Network."
 
RISKS ASSOCIATED WITH POSSIBLE ACQUISITIONS
 
  A portion of the Company's future growth may come from acquisitions of other
companies. The acquisition of additional businesses will depend on the
Company's ability to identify suitable acquisition candidates, to negotiate
acceptable terms for their acquisition and to finance any such acquisitions.
The Company will also be subject to competition for suitable acquisition
candidates. Any acquisitions, if made, could divert the resources and
management time of the Company and would require integration with the
Company's existing networks and services. As a result, there can be no
assurance that any such acquisitions will occur or that any such acquisitions,
if made, would be made in a timely manner or on terms favorable to the Company
or would be successfully integrated into the Company's operations.
 
RAPID TECHNOLOGICAL CHANGES
 
  The telecommunications industry is subject to rapid and significant changes
in technology. While the Company believes that for the foreseeable future
these changes will neither materially affect the continued use of the
Company's time-division multiplexed, circuit switching systems nor materially
hinder the Company's ability to acquire necessary technologies, the effect of
technological changes on the businesses of the Company cannot be predicted.
Thus, there can be no assurance that technological developments will not have
a material adverse effect on the Company.
 
DEPENDENCE ON KEY PERSONNEL
 
  The Company's businesses are managed by a relatively small number of senior
management and operating personnel, the loss of certain of whom could have a
material adverse effect on the Company. The Company
 
                                      17
<PAGE>
 
believes that its ability to manage its planned growth successfully will
depend in large part on its continued ability to attract and retain highly
skilled and qualified personnel. See "Management" for detailed information on
the Company's management and directors. There can be no assurances that the
Company will be able to retain its key employees or that the Company can
attract or retain other skilled personnel in the future.
 
ABSENCE OF A PUBLIC MARKET FOR THE NOTES; POSSIBLE VOLATILITY OF NOTE PRICE
 
  The Senior Notes have been designated for trading by qualified buyers in the
PORTAL Market. The Senior Notes have not been registered under the Securities
Act or any state securities laws, however, and will continue to be subject to
restrictions on transferability to the extent that they are not exchanged for
Exchange Notes. Furthermore, the Exchange Offer will not be conditioned upon
any minimum or maximum aggregate principal amount of Senior Notes being
tendered for exchange. No assurance can be given as to the liquidity of the
trading market of the Senior Notes following the Exchange Offer.
 
  Although the Exchange Notes will generally be permitted to be resold or
otherwise transferred by the holders thereof (other than any holder that is:
(i) an "affiliate" of the Company within the meaning of Rule 405 under the
Securities Act; (ii) a broker-dealer that acquired Senior Notes as a result of
market-making activities or other trading activities; or (iii) a broker-dealer
that acquired Senior Notes directly from the Company for resale pursuant to
Rule 144A or another available exemption under the Securities Act) without
compliance with the registration requirements under the Securities Act, they
will constitute a new issue of securities for which there is currently no
established trading market. If the Exchange Notes are traded after their
initial issuance, they may trade at a discount, depending upon prevailing
interest rates, the market for similar securities, the financial condition of
the Company and other factors beyond the control of the Company, including
general economic conditions. The Company does not intend to apply for a
listing or quotation of the Exchange Notes. The Initial Purchasers have
informed the Company that they currently intend to make a market in the
Exchange Notes. However, the Initial Purchasers are not obligated to do so,
and any such market making may be discontinued at any time without notice. No
assurance can be given as to the development or liquidity of any trading
market for the Exchange Notes.
 
  Notwithstanding the registration of the Exchange Notes in the Exchange
Offer, holders who are "affiliates" of the Company (within the meaning of Rule
405 under the Securities Act) may publicly offer for sale or resell the
Exchange Notes only in compliance with the provisions of Rule 144 under the
Securities Act or any other available exemptions under the Securities Act.
 
  Each broker-dealer that receives Exchange Notes for its own account in
exchange for Senior Notes, where such Senior Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. See "Plan of Distribution."
 
ORIGINAL ISSUE DISCOUNT; POSSIBLE UNFAVORABLE TAX AND OTHER LEGAL CONSEQUENCES
FOR HOLDERS OF NOTES
 
  The Senior Notes were issued at a substantial discount from the stated
principal amount at maturity. Consequently, potential participants in the
Exchange Offer should be aware that there will be no periodic payments of cash
interest on the Exchange Notes prior to August 15, 2003 for U.S. federal
income tax purposes; however, OID (that is, the difference between the stated
redemption price at maturity and the issue price of the Senior Notes) will
accrue from February 18, 1998 and will be includible as interest income
periodically (including for periods ending prior to February 15, 2003) in a
holder's gross income in advance of receipt of the cash payments to which the
income is attributable. Similar results may apply under state and other tax
laws. The Notes constitute "applicable high yield discount obligations"
("AHYDOs"). As a result, for U.S. federal income tax purposes, a small portion
of the OID (the "Disqualified Portion") will not be deductible by the Company
and the balance of OID will not be deductible by the Company until payments
are made with respect thereto. Accordingly, during the term of the Notes, the
Company's after-tax cash flow (or its net operating loss carryforward, as the
case may be) will be less than it would be if the OID on the Notes was
deductible when accrued. For certain corporate holders of the Notes, the
Disqualified Portion may be treated for some U.S. federal
 
                                      18
<PAGE>
 
income tax purposes, as dividends to the holders (to the extent that such
amounts would have been treated as dividends to the holders of the Notes if
they had been distributions with respect to shares of stock of the Company)
and thereby may be subject to a dividends received deduction. See "Certain
United States Federal Income Tax Considerations" for a more detailed
discussion of the U.S. federal income tax consequences to the holders
regarding the purchase, ownership and disposition of the Exchange Notes.
 
  If a bankruptcy case is commenced by or against the Company under U.S.
federal bankruptcy laws after the issuance of the Notes, the claim of a holder
of Exchange Notes with respect to the stated principal amount at maturity
thereof may be limited to an amount equal to the sum of (i) the initial
offering price of the Senior Notes and (ii) that portion of the OID which is
not deemed to constitute "unmatured interest" for purposes of U.S. federal
bankruptcy law. Any OID that was not amortized as of any such bankruptcy
filing would constitute "unmatured interest." To the extent the U.S. federal
bankruptcy law differs from the Internal Revenue Code of 1986, as amended, in
determining the method of amortization of OID, a holder of Notes may realize
taxable gain or loss upon payment of such holder's claim in bankruptcy. See
"Certain United States Federal Income Tax Considerations."
 
CONSEQUENCES OF A FAILURE TO EXCHANGE SENIOR NOTES
 
  The Senior Notes have not been registered under the Securities Act or any
state securities laws and therefore may not be offered, sold or otherwise
transferred except in compliance with the registration requirements of the
Securities Act and any other applicable securities laws, or pursuant to an
exemption therefrom or in a transaction not subject thereto, and in each case
in compliance with certain other conditions and restrictions. Senior Notes
which remain outstanding after consummation of the Exchange Offer will
continue to bear a legend reflecting such restrictions on transfer. In
addition, upon consummation of the Exchange Offer, holders of Senior Notes
which remain outstanding will not be entitled to any right to have such Senior
Notes registered under the Securities Act, except under certain limited
circumstances. The Company does not intend to register under the Securities
Act any Senior Notes which remain outstanding after consummation of the
Exchange Offer. See "The Exchange Offer."
 
  To the extent that Senior Notes are tendered and accepted in the Exchange
Offer, the aggregate stated principal amount at maturity of outstanding Senior
Notes will decrease, which will result in a decrease in the liquidity of the
Senior Notes. Any trading market for Senior Notes which remain outstanding
after the Exchange Offer could be adversely affected.
 
FAILURE TO FOLLOW EXCHANGE OFFER PROCEDURES
 
  Issuance of the Exchange Notes in exchange for Senior Notes pursuant to the
Exchange Offer will be made only after a timely receipt by the Exchange Agent
of: (i) such Senior Notes or a book-entry confirmation of a book-entry
transfer of the Senior Notes into the Exchange Agent's account at The
Depository Trust Company ("DTC"); (ii) the Letter of Transmittal (or a
facsimile thereof), properly completed and duly executed, with any required
signature guarantees; and (iii) any other documents required by the Letter of
Transmittal. Holders of the Senior Notes desiring to tender such Senior Notes
in exchange for Exchange Notes should allow sufficient time to ensure timely
delivery. The Company and the Exchange Agent are under no duty to give
notification of defects or irregularities with respect to the tenders of
Senior Notes for exchange. See "The Exchange Offer."
 
VARIABILITY OF QUARTERLY OPERATING RESULTS
 
  As a result of the significant expenses associated with the expansion and
development of its networks and services and the variability of the level of
revenues generated through sales of its services, the Company anticipates that
its operating results could vary significantly from period to period. Such
variability could have a material adverse effect on the Company. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
LIMITATIONS ON REPURCHASE OF NOTES
 
  Upon a Change of Control, each holder of Exchange Notes will have the right,
at the holder's option, to require the Company to repurchase all or a portion
of such holder's Exchange Notes. If a Change of Control
 
                                      19
<PAGE>
 
were to occur, there can be no assurance that the Company would have
sufficient funds to pay the repurchase price for all Exchange Notes tendered
by the holders thereof. In addition, the Company's repurchase of Exchange
Notes as a result of the occurrence of a Change of Control may be prohibited
or limited by, or create an event of default under, the terms of agreements
related to borrowings which the Company may enter into from time to time,
including senior indebtedness. See "Description of the Exchange Notes--
Repurchase at the Option of Holders upon a Change of Control."
 
INVESTOR RIGHTS
 
  In the event that the Company has not consummated a public offering of its
common stock prior to November 27, 2003, the Equity Investors will each have
the right to require the Company to liquidate and distribute the proceeds of
the liquidation to the Company's creditors and stockholders in the priority of
their claims and as required by applicable law. In the event that the Equity
Investors were to exercise such right, the Company would be forced to cease
operations and liquidate, and there can be no assurance that the Company would
have sufficient cash to pay all or any portion of the principal of or other
amounts due with respect to the Notes.
 
IMPACT OF THE YEAR 2000 ISSUE
 
  The year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year. Any of the
Company's computer programs that have date-sensitive software may recognize a
date using "00" as the year 1900 rather than the year 2000. This could result
in a system failure or miscalculations causing disruptions of operations,
including, among other things, a temporary inability to process transactions,
send invoices, or engage in similar normal business activities.
 
  The Company has assessed its systems and believes them to be year 2000
compliant. In addition, the Company has received assurance from its major
software vendors that the products used by the Company are year 2000 compliant
and will function adequately. If the systems of other companies on whose
services the Company depends or with whom the Company's systems interface are
not year 2000 compliant, it could have a material adverse effect on the
Company.
 
  The Company will continue its year 2000 issue assessment and, if it comes to
the attention of the Company's management that any of its systems, or the
systems of those on whom the Company relies, are not year 2000 compliant, the
Company intends to develop an action plan, and assess the resources it would
be required to devote, to address such problem. There can be no assurance that
devoting further resources of the Company to the year 2000 issue, if one were
to occur, would not have a material adverse effect on the Company.
 
RISKS REGARDING FORWARD-LOOKING STATEMENTS
 
  The statements contained in this Prospectus which are not historical facts
are "forward-looking statements", which can be identified by the use of
forward-looking terminology such as "believes," "expects," "may," "will,"
"should," or "anticipates" or the negative thereof or other variations thereon
or comparable terminology, or by discussions of strategy that involve risks
and uncertainties. Management wishes to caution the reader that these forward-
looking statements, such as its anticipation of revenues from designated
markets, and statements regarding the development of the Company's businesses,
the markets for the Company's services and products, the Company's anticipated
capital expenditures, regulatory reform and other statements contained herein
regarding matters that are not historical facts, are only predictions. No
assurance can be given that the future results will be achieved; actual events
or results may differ materially as a result of risks facing the Company. Such
risks include, but are not limited to, the Company's ability to successfully
market its services to current and new customers, access markets, install
switching electronics, and obtain the use of leased fiber transport facilities
and any required governmental authorizations, franchises and permits, all in a
timely manner, at reasonable costs and on satisfactory terms and conditions,
as well as regulatory, legislative and judicial developments that could cause
actual results to differ materially from the future results indicated,
expressed or implied, in such forward-looking statements.
 
                                      20
<PAGE>
 
                              THE EXCHANGE OFFER
 
PURPOSE AND EFFECT OF THE EXCHANGE OFFER
 
  In connection with the sale of the Senior Notes, the Company entered into
the Registration Agreement with the Initial Purchasers, pursuant to which the
Company agreed to file and to use its best efforts to cause to become
effective with the Commission a registration statement with respect to the
exchange of the Senior Notes for Exchange Notes with terms identical in all
material respects to the terms of the Senior Notes. A copy of the Registration
Agreement has been filed as an exhibit to the Registration Statement of which
this Prospectus is a part (the "Registration Statement"). The Exchange Offer
is being made to satisfy the contractual obligations of the Company under the
Registration Agreement.
 
  By tendering Senior Notes in exchange for Exchange Notes, each holder will
represent to the Company that: (i) any Exchange Notes to be received by such
holder are being acquired in the ordinary course of such holder's business;
(ii) such holder has no arrangement or understanding with any person to
participate in a distribution (within the meaning of the Securities Act) of
Exchange Notes; (iii) such holder is not an "affiliate" of the Company (within
the meaning of Rule 405 under the Securities Act), or if such holder is an
affiliate, that such holder will comply with the registration and prospectus
delivery requirements of the Securities Act to the extent applicable; (iv)
such holder has full power and authority to tender, exchange, sell, assign and
transfer the tendered Senior Notes; (v) the Company will acquire good,
marketable and unencumbered title to the tendered Senior Notes, free and clear
of all liens, restrictions, charges and encumbrances; and (vi) the Senior
Notes tendered for exchange are not subject to any adverse claims or proxies.
Each tendering holder also will warrant and agree that such holder will, upon
request, execute and deliver any additional documents deemed by the Company or
the Exchange Agent to be necessary or desirable to complete the exchange,
sale, assignment, and transfer of the Senior Notes tendered pursuant to the
Exchange Offer. Each broker-dealer that receives Exchange Notes for its own
account in exchange for Senior Notes, where such Senior Notes were acquired by
such broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. See "Plan of Distribution."
 
  The Exchange Offer is not being made to, nor will the Company accept tenders
for exchange from, holders of Senior Notes in any jurisdiction in which the
Exchange Offer or the acceptance thereof would not be in compliance with the
securities or blue sky laws of such jurisdiction.
 
  Unless the context requires otherwise, the term "holder" with respect to the
Exchange Offer means any person in whose name the Senior Notes are registered
on the books of the Company or any other person who has obtained a properly
completed bond power from the registered holder, or any participant in DTC
whose name appears on a security position listing as a holder of Senior Notes
(which, for purposes of the Exchange Offer, include beneficial interests in
the Senior Notes held by direct or indirect participants in DTC and Senior
Notes held in definitive form).
 
TERMS OF THE EXCHANGE OFFER
 
  The Company hereby offers, upon the terms and subject to the conditions set
forth in this Prospectus and in the accompanying Letter of Transmittal, to
exchange $1,000 stated principal amount at maturity of Exchange Notes for each
$1,000 stated principal amount at maturity of Senior Notes properly tendered
prior to the Expiration Date and not properly withdrawn in accordance with the
procedures described below. Holders may tender their Senior Notes in whole or
in part in integral multiples of $1,000 stated principal amount at maturity.
 
  The form and terms of the Exchange Notes will be the same as the form and
terms of the Senior Notes except that (i) the Exchange Notes will have been
registered under the Securities Act and therefore will not be subject to
certain restrictions on transfer applicable to the Senior Notes and (ii)
holders of the Exchange Notes will not be entitled to certain rights of
holders of the Senior Notes under the Registration Agreement. The Exchange
Notes will evidence the same indebtedness as the Senior Notes (which they
replace) and will be issued pursuant to, and entitled to the benefits of, the
Indenture.
 
                                      21
<PAGE>
 
  The Exchange Offer is not conditioned upon any minimum aggregate principal
amount of Senior Notes being tendered for exchange. The Company reserves the
right in its sole discretion to purchase or make offers for any Senior Notes
that remain outstanding after the Expiration Date or, as set forth under "--
Conditions to the Exchange Offer," to terminate the Exchange Offer and, to the
extent permitted by applicable law, purchase Senior Notes in the open market,
in privately negotiated transactions or otherwise. The terms of any such
purchases or offers could differ from the terms of the Exchange Offer. As of
the date of this Prospectus, $270,000,000 aggregate stated principal amount at
maturity of Senior Notes is outstanding.
 
  Holders of Senior Notes do not have any appraisal or dissenters' rights in
connection with the Exchange Offer. Senior Notes which are not tendered for,
or are tendered but not accepted in connection with, the Exchange Offer will
remain outstanding. See "Risk Factors--Failure to Exchange Senior Notes."
 
  If any tendered Senior Notes are not accepted for exchange because of an
invalid tender, the occurrence of certain other events set forth herein or
otherwise, certificates for any such unaccepted Senior Notes will be returned,
without expense, to the tendering holder thereof promptly after the Expiration
Date.
 
  Holders who tender Senior Notes in connection with the Exchange Offer will
not be required to pay brokerage commissions or fees or, subject to the
instructions in the Letter of Transmittal, transfer taxes with respect to the
exchange of Senior Notes in connection with the Exchange Offer. The Company
will pay all charges and expenses, other than certain applicable taxes
described below, in connection with the Exchange Offer. See "--Fees and
Expenses."
 
  THE BOARD OF DIRECTORS OF THE COMPANY MAKES NO RECOMMENDATION TO HOLDERS OF
SENIOR NOTES AS TO WHETHER TO TENDER OR REFRAIN FROM TENDERING ALL OR ANY
PORTION OF THEIR SENIOR NOTES PURSUANT TO THE EXCHANGE OFFER. IN ADDITION, NO
ONE HAS BEEN AUTHORIZED TO MAKE ANY SUCH RECOMMENDATION. HOLDERS OF SENIOR
NOTES MUST MAKE THEIR OWN DECISION WHETHER TO TENDER PURSUANT TO THE EXCHANGE
OFFER AND, IF SO, THE AGGREGATE AMOUNT OF SENIOR NOTES TO TENDER AFTER READING
THIS PROSPECTUS AND THE LETTER OF TRANSMITTAL AND CONSULTING WITH THEIR
ADVISERS, IF ANY, BASED ON THEIR FINANCIAL POSITION AND REQUIREMENTS.
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
  The term "Expiration Date" means 5:00 p.m., New York City time, on   , 1998
unless the Exchange Offer is extended by the Company (in which case the term
"Expiration Date" shall mean the latest date and time to which the Exchange
Offer is extended).
 
  The Company expressly reserves the right in its sole and absolute
discretion, subject to applicable law, at any time and from time to time: (i)
to delay the acceptance of the Senior Notes for exchange; (ii) to terminate
the Exchange Offer (whether or not any Senior Notes have theretofore been
accepted for exchange) if the Company determines, in its sole and absolute
discretion, that any of the events or conditions referred to under "--
Conditions to the Exchange Offer" has occurred or exists or has not been
satisfied; (iii) to extend the Expiration Date of the Exchange Offer and
retain all Senior Notes tendered pursuant to the Exchange Offer, subject,
however, to the right of holders of Senior Notes to withdraw their tendered
Senior Notes as described under "--Withdrawal Rights;" and (iv) to waive any
condition or otherwise amend the terms of the Exchange Offer in any respect.
If the Exchange Offer is amended in a manner determined by the Company to
constitute a material change, or if the Company waives a material condition of
the Exchange Offer, the Company will promptly disclose such amendment by means
of a prospectus supplement that will be distributed to the registered holders
of the Senior Notes, and the Company will extend the Exchange Offer to the
extent required by Rule 14e-1 under the Exchange Act.
 
  Any such delay in acceptance, termination, extension or amendment will be
followed promptly by oral or written notice thereof to the Exchange Agent (any
such oral notice to be promptly confirmed in writing) and by
 
                                      22
<PAGE>
 
making a public announcement thereof, and such announcement in the case of an
extension will be made no later than 9:00 a.m., New York City time, on the
next business day after the previously scheduled Expiration Date. Without
limiting the manner in which the Company may choose to make any public
announcement, and subject to applicable laws, the Company shall have no
obligation to publish, advertise or otherwise communicate any such public
announcement other than by issuing a release to an appropriate news agency.
 
ACCEPTANCE FOR EXCHANGE AND ISSUANCE OF EXCHANGE NOTES
 
  Upon the terms and subject to the conditions of the Exchange Offer, the
Company will exchange, and will issue to the Exchange Agent, Exchange Notes
for Senior Notes validly tendered and not withdrawn (pursuant to the
withdrawal rights described under "--Withdrawal Rights") promptly after the
Expiration Date.
 
  In all cases, delivery of Exchange Notes in exchange for Senior Notes
tendered and accepted for exchange pursuant to the Exchange Offer will be made
only after timely receipt by the Exchange Agent of: (i) Senior Notes or a
book-entry confirmation of a book-entry transfer of Senior Notes into the
Exchange Agent's account at DTC; (ii) the Letter of Transmittal (or facsimile
thereof), properly completed and duly executed, with any required signature
guarantees; and (iii) any other documents required by the Letter of
Transmittal. Accordingly, the delivery of Exchange Notes might not be made to
all tendering holders at the same time, and will depend upon when Senior
Notes, book-entry confirmations with respect to Senior Notes and other
required documents are received by the Exchange Agent.
 
  The term "book-entry confirmation" means a timely confirmation of a book-
entry transfer of Senior Notes into the Exchange Agent's account at DTC.
 
  Subject to the terms and conditions of the Exchange Offer, the Company will
be deemed to have accepted for exchange, and thereby exchanged, Senior Notes
validly tendered and not withdrawn as, if and when the Company gives oral or
written notice to the Exchange Agent (any such oral notice to be promptly
confirmed in writing) of the Company's acceptance of such Senior Notes for
exchange pursuant to the Exchange Offer. The Company's acceptance for exchange
of Senior Notes tendered pursuant to any of the procedures described above
will constitute a binding agreement between the tendering holder and the
Company upon the terms and subject to the conditions of the Exchange Offer.
The Exchange Agent will act as agent for the Company for the purpose of
receiving tenders of Senior Notes, Letters of Transmittal and related
documents, and as agent for tendering holders for the purpose of receiving
Senior Notes, Letters of Transmittal and related documents and transmitting
Exchange Notes to holders who validly tendered Senior Notes. Such exchange
will be made promptly after the Expiration Date. If for any reason whatsoever
the acceptance for exchange or the exchange of any Senior Notes tendered
pursuant to the Exchange Offer is delayed (whether before or after the
Company's acceptance for exchange of Senior Notes), or the Company extends the
Exchange Offer or is unable to accept for exchange or exchange Senior Notes
tendered pursuant to the Exchange Offer, then, without prejudice to the
Company's rights set forth herein, the Exchange Agent may, nevertheless, on
behalf of the Company and subject to Rule 14e-1(c) under the Exchange Act,
retain tendered Senior Notes and such Senior Notes may not be withdrawn except
to the extent tendering holders are entitled to withdrawal rights as described
under "--Withdrawal Rights."
 
PROCEDURES FOR TENDERING SENIOR NOTES
 
  Valid Tender. Except as set forth below, in order for Senior Notes to be
validly tendered pursuant to the Exchange Offer, either: (i) (a) a properly
completed and duly executed Letter of Transmittal (or facsimile thereof), with
any required signature guarantees and any other required documents, must be
received by the Exchange Agent at the address set forth under "--Exchange
Agent" prior to the Expiration Date and (b) tendered Senior Notes must be
received by the Exchange Agent, or such Senior Notes must be tendered pursuant
to the procedures for book-entry transfer set forth below and a book-entry
confirmation must be received by the Exchange Agent, in each case prior to the
Expiration Date; or (ii) the guaranteed delivery procedures set forth below
must be complied with.
 
                                      23
<PAGE>
 
  If less than all of the Senior Notes are tendered, a tendering holder should
fill in the amount of Senior Notes being tendered in the appropriate box on
the Letter of Transmittal. The entire amount of Senior Notes delivered to the
Exchange Agent will be deemed to have been tendered unless otherwise
indicated.
 
  If any Letter of Transmittal, endorsement, bond power, power of attorney, or
any other document required by the Letter of Transmittal is signed by a
trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
such person should so indicate when signing, and unless waived by the Company,
evidence satisfactory to the Company, in its sole discretion, of such person's
authority to so act must be submitted.
 
  Any beneficial owner of Senior Notes that are held by or registered in the
name of a broker, dealer, commercial bank, trust company or other nominee or
custodian is urged to contact such entity promptly if such beneficial holder
wishes to participate in the Exchange Offer.
 
  THE METHOD OF DELIVERY OF SENIOR NOTES, THE LETTER OF TRANSMITTAL AND ALL
OTHER REQUIRED DOCUMENTS IS AT THE OPTION AND SOLE RISK OF THE TENDERING
HOLDER, AND DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE
EXCHANGE AGENT. INSTEAD OF DELIVERY BY MAIL, IT IS RECOMMENDED THAT HOLDERS
USE AN OVERNIGHT OR HAND DELIVERY SERVICE. IN ALL CASES, SUFFICIENT TIME
SHOULD BE ALLOWED TO ASSURE TIMELY DELIVERY AND PROPER INSURANCE SHOULD BE
OBTAINED. NO LETTER OF TRANSMITTAL OR SENIOR NOTES SHOULD BE SENT TO THE
COMPANY. HOLDERS MAY REQUEST THEIR RESPECTIVE BROKERS, DEALERS, COMMERCIAL
BANKS, TRUST COMPANIES OR NOMINEES TO EFFECT THESE TRANSACTIONS FOR SUCH
HOLDERS.
 
  Book-Entry Transfer. The Exchange Agent will make a request to establish an
account with respect to the Senior Notes at DTC for purposes of the Exchange
Offer within two business days after the date of this Prospectus. Any
financial institution that is a participant in DTC's book-entry transfer
facility system may make a book-entry delivery of the Senior Notes by causing
DTC to transfer such Senior Notes into the Exchange Agent's account at DTC in
accordance with DTC's procedures for transfers. However, although delivery of
Senior Notes may be effected through book-entry transfer into the Exchange
Agent's account at DTC, the Letter of Transmittal (or facsimile thereof),
properly completed and duly executed, with any required signature guarantees
and any other required documents, must in any case be delivered to and
received by the Exchange Agent at its address set forth under "--Exchange
Agent" prior to the Expiration Date, or the guaranteed delivery procedure set
forth below must be complied with.
 
DELIVERY OF DOCUMENTS TO DTC DOES NOT CONSTITUTE DELIVERY TO THE
EXCHANGE AGENT.
 
  Signature Guarantees. Certificates for Senior Notes need not be endorsed and
signature guarantees on a Letter of Transmittal or a notice of withdrawal, as
the case may be, are unnecessary unless (a) a certificate for Senior Notes is
registered in a name other than that of the person surrendering the
certificate or (b) a registered holder completes the box entitled "Special
Issuance Instructions" or "Special Delivery Instructions" in the Letter of
Transmittal. In the case of (a) or (b) above, such certificates for Senior
Notes must be duly endorsed or accompanied by a properly executed bond power,
with the endorsement or signature on the bond power and on the Letter of
Transmittal or the notice of withdrawal, as the case may be, guaranteed by a
firm or other entity identified in Rule 17Ad-15 under the Exchange Act as an
"eligible guarantor institution," including (as such terms are defined
therein): (i) a bank; (ii) a broker, dealer, municipal securities broker or
dealer or government securities broker or dealer; (iii) a credit union; (iv) a
national securities exchange, registered securities association or clearing
agency; or (v) a savings association that is a participant in a Securities
Transfer Association (each an "Eligible Institution"), unless surrendered on
behalf of such Eligible Institution. See Instruction 1 to the Letter of
Transmittal.
 
  Guaranteed Delivery. If a holder desires to tender Senior Notes pursuant to
the Exchange Offer and the certificates for such Senior Notes are not
immediately available or time will not permit all required documents to
 
                                      24
<PAGE>
 
reach the Exchange Agent before the Expiration Date, or the procedures for
book-entry transfer cannot be completed on a timely basis, such Senior Notes
may nevertheless be tendered, provided that all of the following guaranteed
delivery procedures are complied with:
 
    (i) such tenders are made by or through an Eligible Institution;
 
    (ii) prior to the Expiration Date, the Exchange Agent receives from such
  Eligible Institution a properly completed and duly executed Notice of
  Guaranteed Delivery, substantially in the form accompanying the Letter of
  Transmittal, setting forth the name and address of the holder of Senior
  Notes and the amount of Senior Notes tendered, stating that the tender is
  being made thereby and guaranteeing that within three New York Stock
  Exchange trading days after the date of execution of the Notice of
  Guaranteed Delivery, the certificates for all physically tendered Senior
  Notes, in proper form for transfer, or a book-entry confirmation, as the
  case may be, and any other documents required by the Letter of Transmittal
  will be deposited by the Eligible Institution with the Exchange Agent. The
  Notice of Guaranteed Delivery may be delivered by hand, or transmitted by
  facsimile or mail to the Exchange Agent and must include a guarantee by an
  Eligible Institution in the form set forth in the Notice of Guaranteed
  Delivery; and
 
    (iii) the certificates (or book-entry confirmation) representing all
  tendered Senior Notes, in proper form for transfer, together with a
  properly completed and duly executed Letter of Transmittal, with any
  required signature guarantees and any other documents required by the
  Letter of Transmittal, are received by the Exchange Agent within three New
  York Stock Exchange trading days after the date of execution of the Notice
  of Guaranteed Delivery.
 
  Determination of Validity. All questions as to the form of documents,
validity, eligibility (including time of receipt) and acceptance for exchange
of any tendered Senior Notes will be determined by the Company, in its sole
discretion, which determination shall be final and binding on all parties. The
Company reserves the absolute right, in its sole and absolute discretion, to
reject any and all tenders determined by it not to be in proper form or the
acceptance for exchange of which may, in the view of counsel to the Company,
be unlawful. The Company also reserves the absolute right, subject to
applicable law, to waive any of the conditions of the Exchange Offer as set
forth under "--Conditions to the Exchange Offer" or any defect or irregularity
in any tender of Senior Notes of any particular holder whether or not similar
defects or irregularities are waived in the case of other holders.
 
  The Company's interpretation of the terms and conditions of the Exchange
Offer (including the Letter of Transmittal and the instructions thereto) will
be final and binding on all parties. No tender of Senior Notes will be deemed
to have been validly made until all defects or irregularities with respect to
such tender have been cured or waived. Neither the Company, any affiliates of
the Company, the Exchange Agent or any other person shall be under any duty to
give any notification of any defects or irregularities in tenders or incur any
liability for failure to give any such notification.
 
RESALES OF EXCHANGE NOTES
 
  Based on interpretations by the staff of the Commission, as set forth in no-
action letters issued to third parties unrelated to the Company (e.g., Exxon
Capital Holdings Corporation, publicly available May 13, 1988; K-III
Communications Corporation, publicly available May 14, 1993; Brown & Wood LLP,
publicly available February 7, 1997; Warnaco, Inc., publicly available October
2, 1991; and Mary Kay Cosmetics, Inc., publicly available June 5, 1991), the
Company believes that holders of Senior Notes (other than any holder that is
(i) a broker-dealer that acquired Senior Notes as a result of market-making
activities or other trading activities, or (ii) a broker-dealer that acquired
Senior Notes directly from the Company for resale pursuant to Rule 144A or
another available exemption under the Securities Act) who exchange their
Senior Notes for Exchange Notes pursuant to the Exchange Offer may offer for
resale, resell and otherwise transfer such Exchange Notes without compliance
with the registration and prospectus delivery provisions of the Securities
Act, provided that such Exchange Notes are acquired in the ordinary course of
such holders' business, such holders have no arrangement or understanding with
any person to participate in the distribution of such Exchange Notes and such
holders are not "affiliates" of the Company (within the meaning of Rule 405 of
the Securities Act). However, the staff of the Commission has not considered
the Exchange Offer in the context of a no-action letter, and there can be no
 
                                      25
<PAGE>
 
assurance that the staff of the Commission would make a similar determination
with respect to the Exchange Offer. Each broker-dealer that receives Exchange
Notes for its own account in exchange for Senior Notes, where such Senior
Notes were acquired by such broker-dealer as a result of market-making
activities or other trading activities, must acknowledge that it will deliver
a prospectus in connection with any resale of such Exchange Notes. See "Plan
of Distribution."
 
WITHDRAWAL RIGHTS
 
  Except as otherwise provided herein, tenders of Senior Notes may be
withdrawn at any time prior to the Expiration Date.
 
  In order for a withdrawal to be effective, a written, telegraphic or
facsimile transmission of such notice of withdrawal must be timely received by
the Exchange Agent at its address set forth under "--Exchange Agent" prior to
the Expiration Date. Any such notice of withdrawal must specify the name of
the person who tendered the Senior Notes to be withdrawn, the aggregate
principal amount of Senior Notes to be withdrawn, and (if certificates for
such Senior Notes have been tendered) the name of the registered holder of the
Senior Notes as set forth on the Senior Notes, if different from that of the
person who tendered such Senior Notes. If certificates for Senior Notes have
been delivered or otherwise identified to the Exchange Agent, the notice of
withdrawal must specify the serial numbers on the particular certificates for
the Senior Notes to be withdrawn and the signature on the notice of withdrawal
must be guaranteed by an Eligible Institution, except in the case of Senior
Notes tendered for the account of an Eligible Institution. If Senior Notes
have been tendered pursuant to the procedures for book-entry transfer set
forth in "--Procedures for Tendering Senior Notes," the notice of withdrawal
must specify the name and number of the account at DTC to be credited with the
withdrawal of Senior Notes and must otherwise comply with the procedures of
DTC. Withdrawals of tenders of Senior Notes may not be rescinded. Senior Notes
properly withdrawn will not be deemed validly tendered for purposes of the
Exchange Offer, but may be retendered at any subsequent time prior to the
Expiration Date by following any of the procedures described above under "--
Procedures for Tendering Senior Notes."
 
  All questions as to the validity, form and eligibility (including time of
receipt) of such withdrawal notices will be determined by the Company, in its
sole discretion, which determination shall be final and binding on all
parties. Neither the Company, any affiliates of the Company, the Exchange
Agent or any other person shall be under any duty to give any notification of
any defects or irregularities in any notice of withdrawal or incur any
liability for failure to give any such notification. Any Senior Notes which
have been tendered but which are withdrawn will be returned to the holder
thereof promptly after withdrawal.
 
INTEREST ON THE EXCHANGE NOTES
 
  The Senior Notes and the Exchange Notes will accrete from February 18, 1998
at a rate of 12.125% per annum, compounded semiannually, to an aggregate
stated principal amount of $270,000,000 by February 15, 2003. Interest will
not be payable on the Exchange Notes prior to February 15, 2003. Thereafter,
interest on the Exchange Notes will accrue at the rate of 12.125% per annum
and will be payable in cash semiannually on August 15 and February 15,
commencing August 15, 2003.
 
CONDITIONS TO THE EXCHANGE OFFER
 
  Notwithstanding any other provisions of the Exchange Offer or any extension
of the Exchange Offer, the Company will not be required to accept for
exchange, or to exchange, any Senior Notes for any Exchange Notes, and, as
described below, may terminate the Exchange Offer (whether or not any Senior
Notes have theretofore been accepted for exchange) or may waive any conditions
to or amend the Exchange Offer, if any of the following conditions have
occurred or exists or have not been satisfied:
 
    (a) there shall occur a change in the current interpretation by the staff
  of the Commission which permits the Exchange Notes issued pursuant to the
  Exchange Offer in exchange for Senior Notes to be offered for resale,
  resold and otherwise transferred by holders thereof (other than (i) broker-
  dealers that acquired Senior Notes as a result of market-making activities
  or other trading activities or (ii) broker-dealers that acquired Senior
  Notes directly from the Company for resale pursuant to Rule 144A or another
  available
 
                                      26
<PAGE>
 
  exemption under the Securities Act) without compliance with the
  registration and prospectus delivery provisions of the Securities Act,
  provided that such Exchange Notes are acquired in the ordinary course of
  such holders' business, such holders have no arrangement or understanding
  with any person to participate in the distribution of such Exchange Notes
  and such holders are not "affiliates" of the Company (within the meaning of
  Rule 405 under the Securities Act);
 
    (b) any action or proceeding shall have been instituted or threatened in
  any court or by or before any governmental agency or body with respect to
  the Exchange Offer which, in the Company's judgment, would reasonably be
  expected to impair the ability of the Company to proceed with the Exchange
  Offer;
 
    (c) any law, statute, rule or regulation shall have been adopted or
  enacted which, in the Company's judgment, would reasonably be expected to
  impair the ability of the Company to proceed with the Exchange Offer;
 
    (d) a stop order shall have been issued by the Commission or any state
  securities authority suspending the effectiveness of the Registration
  Statement, or proceedings shall have been initiated or, to the knowledge of
  the Company, threatened for that purpose;
 
    (e) any governmental approval has not been obtained, which approval the
  Company shall, in its sole discretion, deem necessary for the consummation
  of the Exchange Offer as contemplated hereby; or
 
    (f) any change, or any development involving a prospective change, in the
  business or financial affairs of the Company has occurred which, in the
  sole judgment of the Company, might materially impair the ability of the
  Company to proceed with the Exchange Offer.
 
  If the Company determines in its sole and absolute discretion that any of
the foregoing events or conditions has occurred or exists or has not been
satisfied, the Company may, subject to applicable law, terminate the Exchange
Offer (whether or not any Senior Notes have theretofore been accepted for
exchange) or may waive any such condition or otherwise amend the terms of the
Exchange Offer in any respect. If such waiver or amendment constitutes a
material change to the Exchange Offer, the Company will promptly disclose such
waiver by means of a prospectus supplement that will be distributed to the
registered holders of the Senior Notes, and the Company will extend the
Exchange Offer to the extent required by Rule 14e-1 under the Exchange Act.
 
EXCHANGE AGENT
 
  Harris Trust and Savings Bank has been appointed as Exchange Agent for the
Exchange Offer. Delivery of the Letters of Transmittal and any other required
documents, questions, requests for assistance, and requests for additional
copies of this Prospectus or of the Letter of Transmittal and requests for
Notice of Guaranteed Delivery should be directed to the Exchange Agent as
follows:
 
  By Mail
 
  Harris Trust and Savings Bank
  c/o Harris Trust Company of New York
  Wall Street Station
  P.O. Box 1010
  New York, New York 10268-1010
  Attention: Reorganization Dept.
 
  By Overnight Courier or Hand
 
  Harris Trust and Savings Bank
  c/o Harris Trust Company of New York
  Wall Street Plaza
  88 Pine Street, 19th Floor
  New York, New York 10005
  Attention: Reorganization Dept.
 
                                      27
<PAGE>
 
  By Facsimile (for Eligible Institutions only)
 
  (212) 701-7636
  (212) 701-7637
 
  Confirm by telephone: (212) 701-7624
 
  DELIVERY TO OTHER THAN THE ABOVE ADDRESSES OR FACSIMILE NUMBER WILL NOT
CONSTITUTE A VALID DELIVERY.
 
FEES AND EXPENSES
 
  The expenses of soliciting tenders will be borne by the Company. The
principal solicitation is being made by mail. Additional solicitation may be
made personally or by telephone or other means by officers, directors or
employees of the Company.
 
  The Company has not retained any dealer-manager or similar agent in
connection with the Exchange Offer and will not make any payments to brokers,
dealers or others soliciting acceptances of the Exchange Offer. The Company
has agreed to pay the Exchange Agent reasonable and customary fees for its
services and will reimburse it for its reasonable out-of-pocket expenses in
connection therewith. The Company will also pay brokerage houses and other
custodians, nominees and fiduciaries the reasonable out-of-pocket expenses
incurred by them in forwarding copies of this Prospectus and related documents
to the beneficial owners of Senior Notes, and in handling or tendering for
their customers.
 
  Holders who tender their Senior Notes for exchange will not be obligated to
pay any transfer taxes in connection therewith, except that if Exchange Notes
are to be delivered to, or are to be issued in the name of, any person other
than the registered holder of the Senior Notes tendered, or if a transfer tax
is imposed for any reason other than the exchange of Senior Notes in
connection with the Exchange Offer, then the amount of any such transfer tax
(whether imposed on the registered holder or any other persons) will be
payable by the tendering holder. If satisfactory evidence of payment of such
transfer tax or exemption therefrom is not submitted with the Letter of
Transmittal, the amount of such transfer tax will be billed directly to such
tendering holder.
 
                                      28
<PAGE>
 
                                USE OF PROCEEDS
 
  The Exchange Offer is intended to satisfy certain obligations of the Company
under the Registration Agreement. The Company will not receive any proceeds
from the issuance of the Exchange Notes offered hereby. However, upon the
original issuance of the Senior Notes, the net proceeds received by the
Company, after deducting the discount to the Initial Purchasers and other
expenses payable by the Company, was approximately $144 million. The Company
used or will use the net proceeds (i) to fund the cost of acquiring and
installing telecommunications switches and related infrastructure, (ii) to
fund operating losses, (iii) to repay approximately $3.5 million principal
amount of outstanding indebtedness of a subsidiary, (iv) for potential,
selected acquisitions (although none have been negotiated or contemplated),
and (v) for general corporate purposes. Prior to using the net proceeds for
such purposes, the Company has invested the net proceeds in short-term money
market and other market-rate, investment-grade instruments. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations--
Liquidity and Capital Resources."
 
  In consideration for issuing the Exchange Notes as contemplated in this
Prospectus, the Company will receive, in exchange, an equal number of Senior
Notes in like principal amount. The form and terms of the Exchange Notes will
be identical in all material respects to the form and terms of the Senior
Notes, except as otherwise described herein under "The Exchange Offer--Terms
of the Exchange Offer." The Senior Notes surrendered in exchange for Exchange
Notes will be retired and cancelled and cannot be reissued. As such, no effect
has been given to the Exchange Offer in the pro forma statements or
capitalization tables.
 
                                CAPITALIZATION
 
  The following table sets forth the total capitalization of the Company as of
March 31, 1998, and the total capitalization of the Company as of December 31,
1997. Because the Company will not receive any proceeds for the issuance of
the Exchange Notes offered hereby, no effect has been given to the Exchange
Offer in the pro forma statements or capitalization tables which was not
previously accounted for in the Offering. The information set forth below
should be read in conjunction with the Company's Consolidated Financial
Statements and notes related thereto included elsewhere in this Prospectus.
See "Use of Proceeds," "Management's Discussion and Analysis of Financial
Condition and Results of Operations--Liquidity and Capital Resources," and
"Description of Capital Stock."
 
<TABLE>
<CAPTION>
                                                        AS OF         AS OF
                                                     DECEMBER 31,   MARCH 31,
                                                         1997          1998
                                                     ------------  ------------
                                                                   (UNAUDITED)
   <S>                                               <C>           <C>
   Cash and cash equivalents........................ $ 2,256,552   $152,758,944
                                                     ===========   ============
   Long-term debt...................................   3,536,886    152,093,513
   Redeemable Common Stock Class A, $.01 par value,
    85,567 Shares authorized and 80,307 issued and
    outstanding at December 31, 1997................  12,403,218            --
   Stockholders' equity (deficit):
     Common stock, Class A..........................         --             803
     Common stock, Class B, par value $0.01; 35,000
      shares authorized; 20,000 shares issued and
      outstanding...................................         200            200
     Common stock, Class C, par value $0.01; 15,000
      shares authorized; 14,711 shares issued and
      outstanding...................................         147            147
     Additional paid-in capital.....................    (103,565)    26,098,850
     Accumulated deficit............................  (1,972,154)    (1,988,345)
                                                     -----------   ------------
       Total stockholders' equity (deficit).........  (2,075,372)    24,111,655
                                                     -----------   ------------
       Total capitalization......................... $13,864,732   $176,205,168
                                                     ===========   ============
</TABLE>
 
                                      29
<PAGE>
 
              SELECTED CONSOLIDATED FINANCIAL AND OPERATING DATA
 
  The selected consolidated financial data presented below as of and for the
seven month period ended December 31, 1996, and the year ended December 31,
1997, have been derived from the Consolidated Financial Statements of the
Company, included elsewhere in this Prospectus. The Consolidated Financial
Statements of the Company as of and for the seven month period ended December
31, 1996 and for the year ended December 31, 1997 have been audited by Arthur
Andersen LLP, independent auditors. The selected financial data as of and for
the three month periods ended March 31, 1997 and 1998, have been derived from
the unaudited consolidated financial statements of the Company which, in the
opinion of management, include all adjustments necessary for a fair
presentation of the financial condition and results of operations for the
Company for such periods. The results of operations for interim periods are
not necessarily indicative of a full year's operations. The following
information should be read in conjunction with "Capitalization," "Management's
Discussion and Analysis of Financial Condition and Results of Operations,"
"Business" and the Consolidated Financial Statements of the Company and the
notes related thereto, and the other financial data appearing elsewhere in
this Prospectus.
 
<TABLE>
<CAPTION>
                            PERIOD FROM
                           COMMENCEMENT
                           OF OPERATIONS                    THREE MONTHS ENDED
                         (MAY 31, 1996) TO  YEAR ENDED   -------------------------
                           DECEMBER 31,    DECEMBER 31,   MARCH 31,    MARCH 31,
                               1996            1997         1997          1998
                         ----------------- ------------  -----------  ------------
                                                         (UNAUDITED)  (UNAUDITED)
<S>                      <C>               <C>           <C>          <C>
STATEMENT OF OPERATIONS
 DATA:
Revenue.................    $      --      $  4,023,690  $       --   $  5,102,448
Expenses:
 Customer service and
  network operations....           --         2,154,980        8,697     1,826,893
 Selling, general
  and administrative....       421,777        2,887,372      416,492     1,307,625
 Depreciation and
  amortization..........         1,150          615,817        7,337       890,871
                            ----------     ------------  -----------  ------------
Operating Income
 (loss).................      (422,927)      (1,634,479)    (432,526)    1,077,059
Interest income
 (expense), net.........        17,626           67,626       42,925    (1,093,250)
                            ----------     ------------  -----------  ------------
Net Income (loss).......    $ (405,301)    $ (1,566,853) $  (389,601) $    (16,191)
                            ==========     ============  ===========  ============
<CAPTION>
                                           DECEMBER 31,   MARCH 31,    MARCH 31,
                         DECEMBER 31, 1996     1997         1997          1998
                         ----------------- ------------  -----------  ------------
                                                         (UNAUDITED)  (UNAUDITED)
<S>                      <C>               <C>           <C>          <C>
BALANCE SHEET DATA:
Current Assets..........    $3,807,004     $  4,737,808  $ 5,069,167  $158,404,803
Fixed Assets, net.......        81,153       11,176,774    2,318,202    18,125,851
Total Assets............     3,888,157       15,914,582    7,387,369   182,228,022
Long-term debt..........           --         3,536,886          --    152,093,513
Redeemable Class A Com-
 mon Stock(1)...........     4,024,653       12,403,218    8,024,653           --
Total stockholders' eq-
 uity (deficit).........      (404,954)      (2,075,372)   7,230,097    24,111,655
OTHER FINANCIAL DATA:
EBITDA(2)...............    $ (421,777)    $ (1,018,662) $  (425,189) $  1,967,930
Capital expenditures....        82,303       11,655,524    2,244,385     7,593,061
Deficiency of earnings
 to fixed charges(3)....       405,301        1,566,853      389,601        16,191
SUMMARY CASH FLOW DATA:
Net cash provided by
 (used in) operating
 activities.............    $ (152,576)    $ (1,634,017) $  (522,595) $  3,745,255
Net cash used in
 investing activities...       (82,303)     (11,655,524)  (2,244,385)  (13,537,316)
Net cash provided by
 financing activities...     4,025,000       11,755,972    3,999,514   160,294,453
OPERATING DATA:
Access lines in
 service(4).............           --             7,394          --         14,528
Minutes of use
 (millions).............           --             281.7          --          401.6
</TABLE>
 
                                      30
<PAGE>
 
- --------
(1) See "Capitalization" and "Description of Capital Stock."
(2) EBITDA represents earnings before interest, income taxes, depreciation and
    amortization. EBITDA is not a measurement of financial performance under
    generally accepted accounting principles, is not intended to represent
    cash flow from operations, and should not be considered as an alternative
    to net loss as an indicator of the Company's operating performance or to
    cash flows as a measure of liquidity. The Company believes that EBITDA is
    widely used by analysts, investors and other interested parties in the
    telecommunications industry. EBITDA is not necessarily comparable with
    similarly titled measures for other companies. See "Consolidated
    Statements of Cash Flows."
(3) The ratio of earnings to fixed charges is calculated by dividing (i)
    income (loss) before provision for income taxes, plus fixed charges by
    (ii) fixed charges. Fixed charges consist of interest on indebtedness,
    plus the estimated component of rental expense deemed by the Company to be
    representative of the interest factor.
(4) Represents the number of access lines in service (at a DSO level) and
    excludes the signaling channel of primary rate ISDN-based connections.
 
                                      31
<PAGE>
 
  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
                                  OPERATIONS
 
OVERVIEW
 
  General: The Company began operations during 1996 and has operated in
Chicago since May 1997 and New York since January 1998, currently serving a
total of 6 MSAs (metropolitan statistical areas). The Company plans to offer
services in 37 additional MSAs by the end of 1999, reaching a total of 43 MSAs
in ten metropolitan markets. As of March 31, 1998, the Company had 21,082
access lines sold, of which 14,528 were installed and in service. This
compares to 13,411 lines sold and 7,394 lines installed as of December 31,
1997.
 
  The Company's plan to expand into 37 additional MSAs requires significant
expenditures to fund operating losses and the purchase of capital equipment.
The Company believes it can lower its initial capital requirements and
generate a substantially greater return on invested capital by concentrating
its investment in switching and information, billing, and support systems,
while leasing transport facilities. This network investment strategy differs
from many other competitive local exchange carries (CLECs) who build and
maintain their own transport facilities.
 
  The Company targets its services to telecommunications-intensive customers
and, as a result, expects to generate revenue per line in excess of the
industry average. In addition, the Company's cost structure is anticipated to
be below the industry average. Consequently, the Company expects to more
rapidly generate positive operating cash flow from its new networks as
compared to other CLECs. Nevertheless, the simultaneous development of a
number of new networks may result in negative consolidated operating cash
flow.
 
  Revenues: The Company's revenue is comprised of monthly recurring charges,
usage charges, and initial, non-recurring charges. Monthly recurring charges
include the fees paid by customers for lines in service, additional features
on those lines, and colocation space. Monthly recurring charges are derived
only from end user customers. Usage charges consist of fees paid by end users
for each call made, fees paid by the incumbent local exchange carrier (ILEC)
and other CLECs as reciprocal compensation (which results from the Company
terminating calls made by ILEC customers or other CLEC customers to Focal's
customers), and access charges paid by the interexchange carriers (IXCs) for
long distance traffic originated and terminated by the Company. Usage charges
are derived from both end user customers and from other carriers. Initial non-
recurring charges are paid by end users, if applicable, for the installation
of service by the Company.
 
  Reciprocal compensation is currently a significant component of the
Company's total revenue, representing 76.5% of total revenue recorded during
the first quarter of 1998. This is the result of an imbalance of inbound and
outbound traffic due to the preponderance of inbound applications utilized by
the Company's customers. Such inbound applications include Focal Virtual
Office service which is used by Focal's corporate customers and Focal Multi-
Exchange Service which is used by Focal's Information Service Provider (ISP)
customers. The Company expects the proportion of revenue represented by
reciprocal compensation to decline over time as the percentage of lines sold
for outbound applications increases as each given market matures.
 
  End user invoices are sent monthly with recurring charges being billed in
advance and usage charges being billed in arrears. Reciprocal compensation and
carrier access invoices are sent monthly to the appropriate ILECs and IXCs
according to industry standard practices and in industry standard formats.
 
  Operating Expenses: The Company's operating expenses are categorized as
customer service and network operations; selling, general and administrative;
and depreciation and amortization expense. Settlement costs are a significant
portion of customer service and network operations expense and are comprised
of leased transport charges and reciprocal compensation payments. Leased
transport charges are the lease payments incurred by Focal for the fiber optic
transmission facilities used to connect the Company's customers to its switch
and to connect to the ILEC and other CLEC networks. The Company's strategy of
leasing rather than building its own fiber transport facilities results in the
Company's cost of service being a significant component of total costs.
 
                                      32
<PAGE>
 
The Company has to date been successful in negotiating lease agreements which
match the duration of its customer contracts, thereby allowing the Company to
avoid the risk of continuing expenses associated with transmission facilities
that are not being used by revenue generating customers. The Company pays
reciprocal compensation to ILECs and other CLECs for terminating calls made by
Focal's customers to customers of the ILEC or CLEC.
 
 Other customer service and network operations expense consists of the costs
to operate the Company's network and the costs of providing customer care
activities. Major components include: wages, rent, power, equipment
maintenance, supplies, and contract employees.
 
  Selling, general and administrative expenses consist of sales force
compensation and promotional expenses as well as the cost of corporate
activities related to regulatory, finance, human resources, legal, executive,
and other administrative activities.
 
  The Company's strategy of leasing, rather than building, its transport
network results in capital expenditures which are proportionately lower than
most fiber-based CLECs. In addition, the proportion of capital expenditures
which are "success-based" are higher than most fiber-based CLECs. In contrast,
the Company incurs operating expenses for leased facilities, which are
proportionately higher than fiber-based CLECs. The margin impact of these
higher, anticipated operating expenses is expected to be mitigated, in part,
by a higher revenue per line, which the Company anticipates as a result of its
focus on telecommunications-intensive users.
 
RESULTS OF OPERATIONS
          
 Year Ended December 31, 1997 Compared to Year Ended December 31, 1996     
   
  Revenue for the year ended December 31, 1997 was $4,023,690 compared to zero
revenue generated during the year ended December 31, 1996. This increase is
due to the Company recording its first revenue during May 1997. Prior to May
1997, the Company incurred startup and operating expenses in advance of
revenue as it prepared to launch its network services in the Chicago market.
Customer service and network operations expense increased from zero in 1996 to
$2,154,980 in 1997. There were no customer service or network activities
during 1996. Such activities began as the company initiated construction of
its first network in January 1997 and provision of service in May 1997.
Selling, general and administrative expenses increased from $421,777 in 1996
to $2,887,372 in 1997, largely due to a rapid increase in sales and
administrative personnel during 1997. Depreciation and amortization increased
from $1,150 in 1996 to $615,817 in 1997 due to the increase in assets put into
service by the Company during 1997. Interest income increased from $17,626 in
1996 to $195,696 in 1997 as a result of significantly greater cash balances
after receiving additional equity contributions during 1997. Interest expense
increased from zero in 1996 to $128,070 in 1997 due to debt financing by a
subsidiary of the Company. The net loss increased from $405,301 in 1996 to
$1,566,853 in 1997 as the Company underwent significant growth in its
operations during 1997.     
 
 Three Months Ended March 31, 1998
 
  During the three months ended March 31, 1998, the Company generated
$5,102,448 in operating revenues. Customer service and network operations
expense totaled $1,826,893, and selling, general and administrative expense
during the period was $1,307,625. Customer service and network operations
expenses consisted primarily of leased transport charges, payroll and rent
costs. Selling, general and administrative expenses were largely comprised of
payroll and legal and accounting costs.
 
  Depreciation and amortization expense during the period was $890,871,
resulting primarily from network assets placed in service in the Company's
operational markets. In addition, a portion of the amount is attributable to
the amortization of expenses incurred from the Company's offering of
$270,000,000 stated principal amount at maturity of 12.125% senior discount
notes due 2008. The offering was consummated on February 18, 1998 and the
Company received $150,027,606 in gross proceeds.
 
                                      33
<PAGE>
 
  Interest income for the three months ended March 31, 1998 was $1,015,902 and
interest expense was $2,109,152. The Company's net loss for the period totaled
$16,191. This loss was largely due to increased interest expense accrued by
the Company as a result of the completion of its senior discount note
offering.
 
  For the three months ended March 31, 1998, the Company's Chicago operating
subsidiary had 11,535 access lines in service and generated revenues of
$4,781,132. The subsidiary recorded positive EBITDA, (earnings before
interest, taxes, depreciation and amortization) or $2,834,462, which includes
a pro-rata allocation of central operations and corporate expenses. EBITDA is
not a substitute for net income or cash flow as determined in accordance with
generally accepted accounting principles. The Company believes EBITDA is
commonly used by investors to analyze and compare companies in the
telecommunications industry.
 
 Three Months Ended March 31, 1997
 
  During the three months ended March 31, 1997, the Company did not generate
operating revenue due to the fact that service did not commence until May
1997. Customer service and network operations expenses were $8,692. Selling,
general and administrative expenses were $416,492, resulting primarily from
payroll costs. Depreciation and amortization expense was $7,337 for the three
months ended March 31, 1997. The Company earned $43,055 in interest income and
paid a negligible amount of interest expense. For the three months ended March
31, 1997, the Company had a net loss of $389,601, resulting from the
incurrence of operating expenses for the initial development of the Company's
business.
 
LIQUIDITY AND CAPITAL RESOURCES
 
  The Company's existing operations have required, and its planned operations
will require, significant capital to fund the purchase and installation of
telecommunications switches, equipment, infrastructure, and the operating
losses expected during the start-up phase of each new market. Capital
expenditures were $7,593,061 for the three months ended March 31, 1998 and
$2,244,385 for the three months ended March 31, 1997. The Company expects
total capital expenditures for the year ended December 31, 1998 to be
approximately $50 million. Total capital expenditures for the buildout of the
ten city plan are currently estimated to be $110 million. Prior to the
completion of the senior discount note offering, the Company funded a
substantial portion of its capital expenditures through the private sale of
equity securities. In November 1996, the Company entered into a stock purchase
agreement which provided for the contribution over time of approximately $26.1
million of equity funding by a group of investors. As of February 13, 1998,
the equity investors have contributed the entire $26.1 million to the Company.
In addition, in 1997, the Company's Illinois subsidiary borrowed approximately
$3.5 million under a bank credit facility. The Company used a portion of the
net proceeds from the senior discount note offering to prepay this
indebtedness and cancel the facility.
 
  On February 18, 1998, the Company received gross proceeds of $150,027,606
from the completion of its 12.125% senior discount note offering. The notes
will accrete to an aggregate stated principal amount of $270,000,000 by
February 15, 2003. No interest will be payable on the Notes prior to August
15, 2003. Thereafter, interest will be payable semiannually on August 15 and
February 15 of each year.
 
  With the exception of the fourth quarter of 1997, the Company has incurred
net losses. A portion of the prior equity investments and debt proceeds have
been used to fund the Company's negative cash flow and net losses. Management
believes the Company may produce negative operating cash flow on a
consolidated basis as it completes the buildout of its ten city plan. There
can be no assurance the Company will realize positive consolidated operating
cash flow in subsequent periods. Until sufficient cash flow is generated, the
Company will continue to rely on cash on hand and outside capital to meet its
cash requirements.
 
  The Company's cash flows for the period from May 31, 1996 (the Company's
commencement of operations) to December 31, 1996, was $3,790,121. During this
period, net cash used in operating activities consisted of $152,576; net cash
used in investing activities consisted of $82,303; and net cash provided by
financing activities consisted of $4,025,000. The Company's cash flows for the
year ended December 31, 1997
 
                                      34
<PAGE>
 
   
was $1,533,569. During this period, net cash used in operating activities
consisted of $1,634,017; net cash used in investing activities consisted of
$11,655,524; and net cash provided by financing activities consisted of
$11,755,972. The Company's cash flows for the three months ended March 31,
1998 was $150,502,392. During this period, net cash used in operating
activities consisted of $3,745,255; net cash used in investing activities
consisted of $7,593,061; and net cash provided by financing activities
consisted of $154,350,198.     
 
  The Company expects its available cash, including the net proceeds from the
sale of its senior discount notes, will be sufficient to fund its capital
requirements through 1999. However, if the Company's expansion occurs more
rapidly than currently anticipated or if its operating results are below
expectations, the Company may require additional capital. The Company may
decide to raise additional capital before such time. The Company may secure
additional funding through the sale of public or private debt and/or equity
securities or enter into a future bank credit facility. There can be no
assurance, however, that the Company will be successful in raising sufficient
additional capital on terms that it will consider acceptable or that the
Company's operations will produce positive consolidated cash flow in
sufficient amounts to meet its debt obligations. Failure to raise and generate
sufficient funds may require the Company to delay or abandon some of its
planned future expansion or expenditures, which could have a material adverse
effect on the Company's growth and its ability to compete in the
telecommunications industry.
 
  The foregoing discussion contains forward-looking statements. The Company's
future performance is subject to numerous risks and uncertainties that could
cause actual results to deviate substantially from those discussed in these
forward-looking statements. Factors that could impact the variability of
future results include: the outcome of legal and regulatory proceedings
regarding reciprocal compensation for Internet-related calls; successful
execution of the Company's expansion activities into new geographic markets on
a timely and cost-effective basis; the pace at which new competitors enter the
Company's existing and planned markets; competitive responses of the incumbent
local exchange carriers; execution of interconnection agreements with
incumbent local exchange carriers on terms satisfactory to the Company;
maintenance of the Company's supply agreements for transmission facilities;
continued acceptance of the Company's services by new and existing customers;
and the ability to attract and retain talented employees. Investors are
encouraged to examine the Company's SEC filing on form S-4, which more fully
describes the risks and uncertainties associated with the Company's business.
   
RECENT DEVELOPMENTS     
   
  The Company is in the process of completing preparation of its financial
statements for the second quarter of 1998. The following information
concerning the second quarter of 1998 is based on preliminary, unaudited
financial information and operating data that are subject to adjustment.     
 
<TABLE>   
<CAPTION>
                                                   3 MONTHS ENDED 6 MONTHS ENDED
                                                   JUNE 30, 1998  JUNE 30, 1998
                                                   -------------- --------------
      <S>                                          <C>            <C>
      Revenue (mil)...............................     $  8.1         $ 13.2
      Lines Sold to Date..........................     30,385         30,385
      Lines Installed to Date.....................     24,357         24,357
</TABLE>    
 
                                      35
<PAGE>
 
                                   BUSINESS
 
INTRODUCTION
 
  Focal began operations during 1996 and has operated in Chicago since May
1997 and New York since January 1998, currently serving a total of 6 MSAs
(metropolitan statistical areas.) The Company plans to offer services in 37
additional MSAs by the end of 1999, reaching a total of 43 MSAs in ten
metropolitan markets. As of March 31, 1998, the Company had 21,082 access
lines sold, of which 14,528 were installed and in service. This compares to
13,411 lines sold and 7,394 lines installed as of December 31, 1997.
 
MARKET POTENTIAL
 
  The Company believes the telecommunications-intensive users in Tier I
markets are inadequately served for highly reliable, local switched
telecommunications services. Historically, the emergence of competition in the
telecommunications industry has created demand where none previously existed.
The Company believes that large telecommunications-intensive users will
increasingly demand diversity in local telecommunications providers as they
have already done in long distance and private-line telecommunications
services. The market potential for CLECs is large and growing. According to
data published by the FCC, total revenue from local telecommunications
services in 1996 was $101 billion. While this revenue figure represents total
local usage from residential and all business customers, the Company has
estimated that approximately $45.5 billion of the total $101 billion
represents local usage by businesses. Using further statistical data, the
Company has estimated that the total local usage revenues from the business
segment in the ten Tier I markets in which the Company intends to offer
service is approximately $12.2 billion per year.
 
  The Company believes that its primary competitor in each of its target
markets is the ILEC. Most second generation CLECs initially chose to compete
in Tier II and Tier III markets, effectively ceding the Tier I markets to the
first generation CLECs (i.e., MFS and TCG). Moreover, the vast majority of
CLECs, both first and second generation, provide bundled communications
services to small and medium sized business customers. The Company's
experience to date has supported its belief that, unlike residential and small
to medium sized businesses who may prefer "one-stop" telecommunications
providers, large telecommunications-intensive users will purchase different
types of telecommunications services from different providers. As such, Focal
believes that there are few competitors offering telecommunications-intensive
users a stand-alone alternative to ILEC switched local services. Focal
represents The Third Generation CLEC(TM) that focuses on the provision of
value-added, switched local services to large telecommunications-intensive
users in Tier I markets. Management believes that it has a competitive
advantage over other local service providers as a result of its decision to
provide primarily local service to this significant and underserved market
segment.
 
BUSINESS STRATEGY
 
  Principal Focus on Local Service. The Company offers a focused set of value-
added local switched services to its customers, which management believes
differentiates the Company from a majority of competitors who are seeking to
provide "one-stop" telecommunications services. This focus allows the Company
to outperform its competitors in the areas of network provisioning,
maintenance and customer care. For example, Focal guarantees its customers
that service will be turned-up within a specified period (typically less than
20 calendar days) or the first month fixed line charge is waived. To date, the
Company has met all of its installation commitments on time. Focal believes
its target customers prefer to purchase local telecommunications services from
multiple vendors, as they typically do with equipment, long distance and
private-line services. Management believes that the Company's customers will
seek to distribute an increasing portion of their switched local traffic to
one or more CLECs to secure redundancy and competitive pricing.
 
  Design and Install a Highly Capital-Efficient Network. Management believes
the Company can generate a substantially greater return on invested capital by
concentrating its investment in switching, information, billing
 
                                      36
<PAGE>
 
and support systems, while leasing its transport facilities. Management also
believes that excess fiber capacity and multiple vendors in its target markets
will satisfy the Company's leasing needs and permit Focal to obtain such
facilities at competitive prices for the foreseeable future. Moreover, Focal's
network investment strategy results in a substantially lower, less risky
initial capital requirement than CLECs who build their own fiber facilities
due to a greater proportion of Focal's ultimate capital requirement being
"success-based." Utilizing existing fiber networks allows the Company to enter
markets more quickly, generate revenue and positive cash flows faster, avoid
the need for franchise and right-of-way agreements, and focus on providing
switched services.
 
  Build a More Robust Network than ILECs or CLECs. The Company has designed
and built its network to meet the demanding traffic and reliability
requirements of its target customers. Focal utilizes Nortel, DMS-500 SuperNode
central office switches that have been engineered by the Company to be
virtually non-blocking, thereby maximizing call completion. Focal also designs
its leased fiber facilities to avoid blocking. The Company typically connects
to every local tandem switch in operation by the ILEC and directly connects to
numerous high-use end offices. By connecting to so many points in the ILEC's
network, the Company can improve call completion even if blockage occurs in
portions of the ILEC trunking network. To optimize the entire configuration,
Focal implements overflow routing among the various trunk connections between
itself and the ILEC. Management believes this design is unique among ILECs and
CLECs and is attractive to its telecommunications-intensive customer base.
Moreover, the Company's transport-neutral design allows it to deliver service
from its switch to customers over the fiber transport systems maintained by
each of its several fiber optic transport facility providers.
 
  Minimize Dependence on Deregulation. While the Telecom Act is likely to
benefit CLECs in the long-term, Focal believes the tangible benefits from the
Telecom Act are limited in the short-term. Accordingly, Focal's business
strategy is focused on customers and markets which allow it to minimize its
reliance on provisions of the Telecom Act to achieve its objectives. For
example, while the unbundling of network elements is mandated by the Telecom
Act, the Company believes the ability of a CLEC to obtain unbundled loops of
acceptable transmission quality and in reasonable volumes is not yet
practicable in most ILEC jurisdictions. However, due to its target customer
base and the existence of high capacity transmission facilities to such
customers in the major markets, Focal is able to limit its leased transport
network to facilities of T-1 capacity or greater. Similarly, while number
portability is mandated by the Telecom Act, Focal believes the interim number
portability methods utilized today are unreliable and perform poorly.
Consequently, Focal has concentrated on providing outbound and incremental
inbound (i.e., inbound traffic using new numbers) calling applications rather
than expose its customers to the potential loss of inbound calls on existing
numbers due to the poor performance of remote call forwarding applications
currently used to achieve number portability.
 
  Penetrate Corporate Accounts. The Company emphasizes the diversity,
reliability and sophistication of its network and services in order to earn
its selection as the local provider of choice for its customers. Focal has
developed a number of products and services which it believes provide it with
a competitive advantage when attempting to penetrate new corporate accounts,
including Focal Virtual Office and 800 service. See "Business--Products and
Services." Focal's initial sale to a corporate account typically involves
installing incremental lines for specialized inbound applications or
supplanting only a limited number of outbound lines. Management believes that
the Company will thereafter be able to increase its overall penetration of
local service from the customer based on the quality of its service.
 
  Take Advantage of the Significant and Growing ISP Opportunity. The dramatic
increase in dial-up access to the Internet has created a particularly strong
demand for local access lines by ISPs. CLECs are generally well-positioned to
satisfy this demand as the only alternative source of access lines. Focal
offers advantages to ISPs that certain of its competitors are currently unable
to provide, such as environmentally conditioned colocation space, virtually
non-blocking switching and transport facilities, guaranteed installation times
and modified foreign exchange service (which allows certain calls which would
otherwise be toll calls to be made as local calls). Focal does not offer its
own Internet access service and is, therefore, not viewed as a direct
competitor of the ISPs which it serves. ISP traffic also helps maximize
network utilization by bringing traffic onto the network typically during off-
peak periods, such as evenings and weekends.
 
                                      37
<PAGE>
 
  Maximize Network Utilization through VAR and Other Wholesale
Arrangements. To further maximize network utilization while minimizing cost of
sales, Focal distributes service to other customer segments through VARs and
other wholesale arrangements. Management believes that many telecommunications
service providers, including long distance companies and wireless
licenseholders, will seek to provide bundled telecommunications services in
Tier I markets. The Company does not currently intend to offer bundled
telecommunications services or directly distribute its services to residential
or small to medium sized business customers--the most attractive segment to
bundled service providers. Because the Company does not intend to offer
bundled services or offer services to customers these entities are likely to
serve, Management believes that entities intending to offer bundled services
are more likely to purchase local service from Focal than its ILEC or CLEC
competitors who may compete with these entities.
 
NETWORK
 
  The Company has chosen to pursue a network design approach which involves
purchasing and maintaining its own switches while leasing fiber optic
transmission facilities on an incremental basis as demand dictates. This
approach is made possible by the availability of fiber optic transmission
facilities from multiple vendors in each of the markets it intends to serve.
This switch-based, leased transport network architecture allows the Company to
(i) reduce the capital investments necessary to provide services to its
customers by focusing its capital expenditures on its switches, the most
critical component of its network, (ii) avoid the construction of speculative
fiber optic facilities and the "stranded" capital sometimes associated with
such construction, (iii) better match the commitment of capital to the
acquisition of revenue generating customers and (iv) generate revenue and cash
flow more quickly than if the Company constructed its own fiber optic
facilities. The Company leases transmission facilities from at least three
vendors in each market in which it conducts business, providing the Company
with negotiating leverage and allowing the Company to offer its customers
added redundancy and diversity. In addition, the Company's network has been
specifically designed to satisfy the needs of its high-volume corporate
customer base and has been engineered to be virtually non-blocking, thereby
maximizing call completion.
 
  The Company believes the implementation of its network architecture
represents a lower risk, demand-driven approach requiring less capital
deployment than that required for the build out of a fiber optic
infrastructure. The Company concludes that it can generate a substantially
greater return on invested capital by concentrating its investment in
switching, information, billing, and support systems, while leasing the
transport facilities necessary to complete its full service offering. Focal's
network investment strategy results in a substantially lower, less risky
initial capital requirement than CLECs who build their own fiber facilities
due to a greater proportion of Focal's ultimate capital requirement being
"success-based."
 
  Focal has the flexibility to add or subtract transport capacity on an
incremental basis with the addition or loss of customers. The Company believes
that the quantity of existing and planned fiber transport facilities and its
distribution among numerous owners will be sufficient to satisfy the Company's
need for leased transport facilities and permit Focal to obtain such
facilities at competitive prices for the foreseeable future. The ability of
the Company to consider the option of leasing its transport is the result of
the relative maturity of the competitive access market and the high operating
leverage associated with such networks. For these reasons, the fiber transport
providers which own and operate such fiber networks in the major metropolitan
markets compete for the Company's transport business in order to maximize the
return on their fixed-asset fiber networks. In many cases, this occurs despite
the fiber transport provider marketing its own switched services in
competition with Focal.
 
  While the Company expects the fiber transport providers will continue to
find it in their best interest to compete for Focal's transport business, the
fact that they are common carriers requires that they make their transport
services available to Focal on terms no worse than those provided to any
similarly situated customer. In each market, Focal has or anticipates having
multiple fiber transport providers available for transport including the ILEC
and at least two CLECs. The Company expects that over time it may become
optimal to construct a portion of its own transport facilities as the traffic
volume in certain geographic areas reaches critical mass.
 
                                      38
<PAGE>
 
PRODUCTS AND SERVICES
 
  Focal primarily offers local services to its customers. These services can
generally be segmented into inbound and outbound calling services.
 
  Inbound Services. The Company's basic, inbound service allows for the
completion of calls to a new phone number supplied to the customer by the
Company. Focal believes the interim number portability methods utilized today
are unreliable and perform poorly. In addition, Focal has no control over such
number portability methods. Rather than migrating a customer's existing
telephone number to the Focal network, Focal has concentrated on providing
incremental inbound (i.e., inbound traffic using new numbers) calling
applications. In this way, its customers are not exposed to the potential loss
of inbound calls on existing numbers due to the poor performance of remote
call forwarding applications which are currently used to achieve number
portability.
 
  The Company offers a number of inbound calling applications. Direct inward
dial ("DID") service allows inbound calls to reach a particular station on a
customer's telephone system without operator intervention. Focal markets DID
service to corporations as both a primary service and as a backup service. As
a primary service, the customer uses Focal numbers in instances where a new
line and number are necessary such as when a customer hires a new employee. As
a backup service, Focal can implement an alternative numbering plan for the
customer should the customer's primary service from the ILEC be interrupted.
 
  Focal Virtual Office is designed to allow a company's employees to dial-in
to the company's local area network ("LAN") via a telephone number within that
employee's untimed local calling area. As such, the employee can access the
LAN without incurring time sensitive charges and the company avoids
maintaining relatively expensive, region-wide 800 service for LAN access.
Future enhancements to these inbound services are planned which will increase
the screening capabilities and provide an added layer of security to a
company's LAN, remote access functionality.
 
  Focal Multi-Exchange Service, a variant of the Focal Virtual Office service,
is sold to ISPs and allows the ISPs' customers to cost-effectively access the
ISPs' remote access servers. The combination of the multi-exchange service
capability, a single point of exchange of the traffic, and Focal's high level
of customer care has resulted in strong demand for such services by the ISPs.
 
  Outbound Services. The Company's basic outbound services allow for the
completion of local and toll calls within a metropolitan region. Such direct
outward dial ("DOD") service is utilized by end users in several ways. As a
primary service, a customer uses Focal as a replacement for the ILEC in
originating calls bound for destinations within the region. In the least cost
routing ("LCR") application, a customer can utilize Focal service in
conjunction with its existing ILEC service to route calls using whichever
carrier is least expensive for that given call type. LCR has been implemented
for long distance calling by large corporate users for a number of years.
 
  Other outbound applications in which Focal service is utilized include
outbound 800 calling and long distance overflow service. In the 800 calling
application, Focal de-loads a customer's outbound, local lines and provides an
incentive to the customer to handle that customer's outbound 800 calls. In the
case of long distance overflow service, Focal acts as a backup to the
customer's existing long distance carrier in order to optimize the number of
direct, special access lines installed from the customer's premises to the
long distance carrier's point of presence.
 
  All of the services described above are commonly provisioned over a T-1
facility and interface the customer's private branch exchange equipment
("PBX") directly, thereby averting the need for Focal to provision premises-
based multiplexing equipment. This is possible due to the high traffic volume
characteristic of the large telecommunications-intensive accounts which the
Company targets. The ability to directly interface existing customer premises
equipment ("CPE") further minimizes the Company's capital investment
requirements and maximizes overall return on capital.
 
                                      39
<PAGE>
 
  Focal also offers its customers the ability to colocate equipment in the
Company's switching and operations center. Equipment colocation benefits the
customer by allowing it to inexpensively deploy its equipment without having
to maintain environmentally controlled space. In addition, customers that
colocate qualify for special discounts on the monthly line rates for Focal's
switched services. From the Company's perspective, it is less costly to
deliver service within its own space since no leased transport is required to
reach the customer. This service is particularly well suited to Focal's ISP
customers, who frequently operate remote access servers and routers in
conjunction with the Company's switched services.
 
SALES AND MARKETING
 
  Focal's objective is to satisfy the need for highly reliable, local switched
telecommunications services for telecommunications-intensive users in Tier I
markets by providing diverse, reliable and sophisticated service. Focal
believes it has a competitive advantage in satisfying this need since the
Company, from network architecture to customer service, is focused on
delivering a limited number of value-added services to its target customers.
 
  Diversity. Focal provides diversity to telecommunications-intensive users by
delivering highly reliable, local switched telecommunications services as an
alternative to the ILEC in a multi-vendor environment. Such diversity already
exists with respect to other telecommunications services. Telecommunications-
intensive users clearly embrace the benefits that diversity brings;
principally, that redundancy minimizes the effects of facilities failures and
maximizes competitive pricing. As a result, the majority of Focal's target
customers typically have multiple long distance vendors, multiple equipment
providers, and multiple local private-line vendors. Because of its focused
strategy, the Company is uniquely positioned to become the preferred provider
of choice for local switched telecommunications services for large corporate
accounts, ISPs and VARs. The Company's focused strategy is predicated on its
ability to deliver the superior level of reliable, sophisticated and
competitive services that its customers require.
 
  Reliability. Focal provides reliable service to telecommunications-intensive
users, who are highly sensitive to the potential effects of facilities
failures, by designing its own network around the same theme of diversity that
it advocates for its customers. Although local switched services are perceived
as simple, basic services, the delivery of highly reliable local switched
services requires sophisticated systems. Focal has designed and built its
switching and transport network to meet the demanding traffic and reliability
requirements of its target customers. The Company's network strategy is based
on developing and operating a highly robust, reliable, and high-throughput,
local network relative to the ILECs and other CLECs. Because Focal is a new
entrant to the market, the Company acknowledges that it must meet or exceed
the performance characteristics of the existing local networks in order to
attract telecommunications-intensive users to its service. Unlike smaller
users which tend to pre-qualify vendors based on price, the Company believes
that telecommunications-intensive users qualify potential vendors based on the
performance characteristics of their networks, particularly noting the
reliability aspects. Therefore, the design and operation of the network is a
key success factor in the business development process.
 
  From an equipment standpoint, the Company conducted an exhaustive research
effort to identify the best hardware for the high-volume users that Focal
intends to serve. The result of such research led Focal to select Nortel, DMS-
500 SuperNode central office switches which the Company has engineered to be
virtually non-blocking. As such, customers are unlikely to find themselves
unable to complete or receive calls due to limitations inherent in Focal's
switches. In addition to engineering its switches to avoid blocking, Focal
also designs its leased fiber facilities to avoid blocking. The Company
typically connects to every local tandem switch in operation by the ILEC and
directly connects to numerous high-use end offices. By increasing the number
of connections to the ILEC's network, the Company can improve call completion
even if blockage occurs in portions of the ILEC trunking network. In order to
optimize the entire configuration, Focal implements overflow routing among the
various trunk connections between itself and the ILEC. Focal specifically
engineered its entire network to accommodate a volume per customer far in
excess of that which the ILECs or other CLECs would anticipate given the much
broader range of user volumes they serve. The Company believes its design is
unique
 
                                      40
<PAGE>
 
among ILECs and CLECs and is attractive to its telecommunications-intensive
customer base. Moreover, reliability is further enhanced by the Company's
transport-neutral design which allows it to deliver service from its switch to
customers over the multiple fiber transport systems maintained by each of its
several fiber optic transport facility providers.
 
  In every aspect of network design, Focal has implemented safeguards to
maximize reliability. Because of its distributed architecture, the DMS-500
switch allows the Company to automatically migrate customer traffic across
multiple bays of equipment, protecting against a line card failure. In
addition, the switch was engineered by Nortel with fully redundant processors
and memory in the event of a temporary failure. Focal's disaster prevention
strategy includes service from multiple power grids, on-site battery backup,
and diesel generator power at each switching facility to protect against
failures in its electrical service.
 
  Sophistication. The Company recognizes that its target customers are
knowledgeable, sophisticated buyers that demand a high level of
professionalism throughout a vendor's organization. Focal believes that the
technical sophistication of its management and operations team is a critical
factor for its initial success and will continue to be a key element of
differentiation for the Company among its target customers. Focal requires a
well-experienced team of sales professionals to execute its strategy of
penetrating the telecommunications-intensive accounts. Therefore, attracting
and retaining experienced sales professionals is important to the Company's
overall success. The compensation of the Company's sales professionals is
structured to retain these valuable employees (through stock ownership) and
provides cash compensation incentives which bind the success of the sales team
members to the Company's revenue and operating cash flow objectives.
 
  The Company has divided its direct sales force into three groups: (i) the
Corporate Services Group ("CSG"), responsible for selling to large, corporate
users; (ii) the Internet Services Group ("ISG"), responsible for selling to
Internet service providers; and (iii) the Telecom Services Group ("TSG"),
responsible for selling services on a wholesale basis to VARs and other
carriers. This segmentation permits each sales group to develop the particular
knowledge base and product focus necessary to gain credibility in each market
niche.
 
  Focal's sales strategy for a corporate account sold through the CSG is to
complement the customer's existing service from the ILEC. Unlike other CLECs,
the Company does not offer a comprehensive bundle of telecommunications
services to corporate customers. Rather, the Company believes that there is a
specific demand for high quality, cost effective local switched service as a
stand-alone product. Focal's initial sale to a corporate account typically
involves installing incremental lines for specialized inbound applications or
supplanting only a limited number of outbound lines. After building the
service relationship, Focal anticipates increasing its overall penetration of
local service from the customer such that over a period of time, the Company
expects to dominate a corporate customer's local switched traffic. The Company
emphasizes its diversity, reliability and sophistication of service in order
to earn its selection as the local provider of choice for its customers.
 
  Focal's ISG is able to offer several value-added services to ISPs, such as
environmentally conditioned colocation space, virtually non-blocking switching
and transport facilities, guaranteed rapid installation times and modified
foreign exchange service, which allows certain calls that would otherwise be
toll calls to be made as local calls. In addition, Focal's ISG can highlight
to the ISPs that the Company does not offer its own Internet access service
and is, therefore, an attractive, non-threatening service provider. Serving
the ISP segment also maximizes Focal's network utilization by bringing traffic
onto the network during periods, such as during evenings or on weekends, in
which the network would be otherwise underutilized.
 
  Focal's TSG direct markets to other carriers and VARs by positioning the
Company as a highly reliable, responsive, and cost-effective source of
wholesale local switched telecommunications services. The Company believes a
wide array of telecommunications service providers, including long distance
companies and wireless licenseholders, will seek to provide bundled
telecommunications services in Tier I markets. Focal is well positioned to be
the provider of choice for re-bundled local service. The Company does not
intend to offer bundled telecommunications services or directly distribute its
services to residential or small to medium sized
 
                                      41
<PAGE>
 
business customers--the segment which is most attractive to the "bundled"
service providers. Consequently, the Company believes that entities which
might wish to "purchase" the local service portion of their bundled offering
on a wholesale basis are more likely to purchase that service from Focal than
its ILEC or CLEC competitors.
 
  Superior customer service is critical to achieving Focal's goal of capturing
market share. The Company is continually enhancing its service approach which
utilizes a trained team of customer sales and service representatives to
coordinate customer installation, billing and service. A comprehensive support
system is also a critical component of the Company's service delivery. The
Company has installed an integrated system which is designed to provide
comprehensive features addressing all aspects of its business, including
service order, provisioning, end user and carrier billing, and trouble
reporting. The efficiency of Focal's operating processes contributes to the
Company's ability to rapidly initiate service to new accounts. The
installation desk follows the customer's order, ensuring the installation date
is met. Additionally, customer sales representatives respond to all other
customer service inquiries, including billing questions or repair calls. The
Company believes automation of internal processes contributes greatly to the
overall success of a service provider and billing is a critical element of any
telephone company's operation. The Company expects to be able to deliver
billing information in a number of media besides paper including electronic
files, Internet inquiry or on-line inquiry. The Company believes this system
is readily adaptable to changing circumstances and is scaleable to support the
Company's operations throughout its expected growth.
 
COMPETITION
 
  The primary competitor to the Company in each of its target markets is the
ILEC, most often an RBOC and/or GTE Corporation. The ILECs are generally
required to file their prices in tariffs with the public utilities commission
in each state. Any price changes must be reflected in the tariffs. Generally,
the ILECs have been given the flexibility to respond with lower pricing in
competitive situations. In most cases, these proposals must also be filed as
individual case basis tariffs and the pricing must be made available to other
similarly situated customers. Thus, while the ILECs in many states have some
pricing flexibility for local services, they must usually file any special
pricing plans offered and make such plans available to other customers. Focal
believes this provides a disincentive for the ILEC to significantly vary or
discount prices even in competitive situations.
 
  The ILECs have substantially more resources than the Company and offer a
wider array of services and in a broader geographic area than the Company. As
a result, the ILECs may have an incentive to subsidize the pricing for
services in which Focal competes with the profits from other services in which
the ILEC remains the monopoly provider. Focal believes competition from
various providers has limited the number of ILEC monopoly services and state
regulators have exercised their enforcement powers such that it is unlikely
the ILEC would be able to successfully pursue such a protective strategy for
an extended period.
 
  A number of IXCs have introduced local telecommunications services in
competition with the ILEC and Focal. These services include toll calling and
other local calling services; often packaged with the company's long distance
service. While Focal does not believe the packaging aspect of the service is
particularly attractive to the telecommunications-intensive users which the
Company targets, large IXCs enjoy certain competitive advantages over the
Company due to their vast financial resources. In addition, the Company
believes there is a risk that IXCs may subsidize the pricing of their local
services with profits from long distance services. Focal anticipates the entry
of the RBOCs into the long distance market will reduce the risk of such cross-
subsidization by reducing the profitability of the IXCs' long distance
minutes. Further, to the extent an IXC purchases Focal's service on a
wholesale basis and rebundles it at a subsidized rate, Focal may benefit as
the subsidized, wholesale service could result in a higher penetration than
would otherwise have occurred. In addition, Focal has successfully displaced
IXCs in customer accounts where the customer was dissatisfied with the quality
of the IXCs' local service. Focal expects its reputation for exceptional
service quality and customer care will continue to result in it displacing
IXCs as the primary alternative to the ILEC in competitive situations.
 
  In addition to competition with the ILEC and IXCs, there are several CLECs
with switching facilities in each city in which Focal intends to operate. In
most cases, the stated target customer base for other CLECs is
 
                                      42
<PAGE>
 
the small and medium size business customer. This differs from Focal's target
customer base of telecommunications-intensive users. Despite the current
difference in customer focus, the Company, at times, has competed against
other CLECs for customer business in the telecommunications-intensive customer
segment. The ongoing consolidation in the CLEC industry could change the
nature of the Company's competitive environment. Although there can be no
assurance, the Company does not expect that such consolidation will be
detrimental to its business.
 
REGULATION
 
  The following summary of regulatory developments and legislation does not
purport to describe all present and proposed federal, state, and local
regulation and legislation affecting the telecommunications industry. Existing
federal and state regulations are currently the subject of judicial
proceedings, legislative hearings and administrative proposals which could
change, in varying degrees, the manner in which this industry operates.
Neither the outcome of these proceedings, nor their impact upon the
telecommunications industry or the Company, can be predicted at this time.
 
  Overview. The Company's services are subject to varying degrees of federal,
state and local regulation. The FCC exercises jurisdiction over all facilities
of, and services offered by, telecommunications common carriers such as the
Company, to the extent those facilities are used to provide, originate or
terminate interstate or international communications. State regulatory
commissions retain jurisdiction over most of the same facilities and services
to the extent they are used to originate or terminate intrastate
communications. In addition, many of the regulations issued by these
regulatory bodies may be subject to judicial review, the result of which
review the Company is unable to predict.
 
  Federal Regulation. The Company must comply with the requirements of common
carriage under the Communications Act of 1934, as amended (the "Communications
Act"). Comprehensive amendments to the Communications Act were made by the
Telecom Act, which was signed into law on February 8, 1996. The Telecom Act
effected plenary changes in regulation at both the federal and state levels
that affect virtually every segment of the telecommunications industry. The
stated purpose of the Telecom Act is to promote competition in all areas of
telecommunications and to reduce unnecessary regulation to the greatest extent
possible. While management believes it will take years for the industry to
feel the full impact of the Telecom Act, it is already clear the legislation
provides the Company with both opportunities and challenges.
 
  The Telecom Act gives the FCC the authority to forebear from regulating
companies if it finds such regulation does not serve the public interest, and
directs the FCC to review its regulations for continued relevance on a regular
basis. As a result of this directive, a number of the regulations that apply
to CLECs have been and may continue to be eliminated in the future. While it
is therefore expected that a number of regulations that were developed prior
to the Telecom Act will be eliminated in time, those which apply to the
Company at present are discussed below.
 
  The Telecom Act greatly expands the FCC's interconnection requirements on
the ILECs. The Telecom Act requires the ILECs to: (i) provide physical
colocation, which allows companies such as Focal and other interconnectors to
install and maintain their own network termination equipment in ILEC central
offices, and virtual colocation only if required or if physical colocation is
impractical due to space limitations or due to technical infeasibility; (ii)
unbundle and provide access to components of their local service networks to
other providers of local service; and (iii) establish "wholesale" rates for
the services they offer at retail to subscribers who are not telecommuications
carriers to promote resale by CLECs and other competitors; and requires ILECs
and CLECs, such as the Company, to: (i) establish number portability, which
will allow a customer to retain its existing phone number if it switches
service providers; (ii) establish dialing parity, which is intended to ensure
customers will not detect a quality difference in dialing telephone numbers or
accessing operators or emergency services; and (iii) provide nondiscriminatory
access to telephone poles, ducts, conduits and rights-of-way. In addition, the
Telecom Act requires ILECs and CLECs to compensate each other for traffic
originated by one and terminated on the network of the other.
 
                                      43
<PAGE>
 
  ILECs are required to negotiate in good faith with carriers requesting any
or all of the above arrangements. If a requesting carrier cannot reach an
agreement within the prescribed time, either carrier may request binding
arbitration by the state commission. Where an agreement cannot be reached,
carriers remain subject to the interconnection obligations established by the
FCC and state telecommunications regulatory commission.
   
  The Company has successfully negotiated interconnection agreements with
Ameritech in Illinois and Indiana and with Bell Atlantic Corporation ("Bell
Atlantic") in New York, New Jersey, Pennsylvania and Delaware and Pacific Bell
Corporation ("Pacific Bell") and GTE in California. The Company also has been
granted global authority by the FCC to provide facilities-based and resold
international telecommunications services.     
 
  The FCC is charged with establishing national guidelines to implement the
Telecom Act. The FCC issued its Interconnection Orders on August 8, 1996,
which established detailed rules regarding rates, terms and conditions for
interconnection between CLECs and ILECs and for the implementation of dialing
parity. The Interconnection Orders were appealed to the U.S. Court of Appeals
for the Eighth Circuit. On July 18, 1997, the Court issued a final decision
vacating the interconnection pricing rules and "most favored nation" rules as
well as certain other interconnection rules. On October 14, 1997, the U.S.
Court of Appeals for the Eighth Circuit ruled that ILECs are under no
obligation to provide competing carriers, which would include the Company,
with a rebundled package of individual network elements. The Eighth Circuit
decision creates uncertainty about the rules governing pricing, terms and
conditions of interconnection agreements, and could make negotiation and
enforcement of such agreements more difficult and protracted, and may require
renegotiation of existing agreements. Several parties have appealed the Eighth
Circuit decisions to the United States Supreme Court. The Supreme Court
granted certiorari in several of those appeals. It is not possible at this
time to determine how or when the Supreme Court will respond to these appeals.
 
  Since the Telecom Act's interconnection requirements also apply to IXCs and
all other providers of telecommunications services, including the Company, it
may provide the Company with the ability to reduce its own access costs by
interconnecting directly with non-ILECs, but may also cause the Company to
incur additional administrative and regulatory expenses in responding to
interconnection requests. At the same time, the Telecom Act also makes
competitive entry into other services or geographic markets more attractive to
RBOCs, other ILECs and IXCs and other companies, and likely will increase the
level of competition the Company faces.
 
  While the Telecom Act reduces regulation to which non-dominant local
exchange carriers are subject, it also reduces the level of regulation that
applies to the ILECs, and increases their ability to respond quickly to
competition from the Company and others. For example, in accordance with the
Telecom Act, the FCC has applied "streamlined" tariff regulation to the ILECs,
which greatly accelerates the time prior to which changes to tariffed service
rates may take effect, and eliminates the requirement that ILECs obtain FCC
authorization before constructing new domestic facilities. These actions will
allow ILECs to change service rates more quickly in response to competition.
Similarly, the FCC has proposed affording significant new pricing flexibility
to ILECs subject to price cap regulation. To the extent such increased pricing
flexibility is provided, the Company's ability to compete with ILECs for
certain service may be adversely affected. In addition, a U.S. District Court
in Texas recently invalidated certain provisions of the Telecom Act which
prohibited RBOC engagement in certain manufacturing and marketing activities
and conditioned RBOC provision of in-region long distance service upon a
demonstration that the local market had been opened to competition. The
decision only directly applies to the RBOC parties to the proceeding. The
decision has been stayed pending appeal. The outcome of any such appeals
cannot be predicted at this time. There can be no assurances that the District
Court's decision will be reversed and, if not reversed, that the decision will
not have an adverse effect on the Company. While BellSouth Corp. ("BellSouth")
is not a party to that proceeding, BellSouth has appealed the FCC's previous
order denying BellSouth's request to provide in-region long distance service
in South Carolina. BellSouth has challenged the order on the same grounds as
Southwestern Bell Telephone Company challenged Sections 271 through 275 of the
Telecom Act.
 
                                      44
<PAGE>
 
  The Company expects to receive a significant portion of its initial revenue
in a given market from the ILEC in the form of reciprocal compensation
payments. This is a result of the Company's ISP and corporate customers
receiving more calls than they make due to the initial mix of applications
typically sold. Certain ILECs have refused to pay that portion of reciprocal
compensation that they estimate is the result of inbound ISP traffic since
they believe such traffic to be interstate in nature and not covered under the
interconnection agreements. While ILECs in all 19 states in which this issue
has been decided, including states in which the Company operates or proposes
to operate, have been ordered to pay reciprocal compensation for such calls,
there can be no assurance that the payment of reciprocal compensation for ISP
traffic will be maintained. The FCC is also considering this matter in
response to a request for a declaratory ruling. A final determination that
such traffic is not eligible for reciprocal compensation would have a material
adverse effect on the Company. See "--Legal and Administrative Proceedings."
 
  On May 8, 1997, in compliance with the requirements of the Telecom Act, the
FCC released an order establishing a new federal universal service support
fund, which provides subsidies to carriers that provide service to under-
served individuals and customers in high-cost or low-income areas, and to
companies that provide telecommunications services and wiring for schools and
libraries and to rural health care providers. The Company is required to
contribute into the universal service fund and also is required to contribute
to state universal service funds. The Company may also obtain subsidies from
the universal service fund for certain services it provides. The new universal
service rules will be administered jointly by the FCC, the fund administrator,
and state regulatory authorities, many of which are still in the process of
establishing their administrative rules. The net revenue effect of these
regulations on the Company cannot be determined at this time.
 
  Non-dominant carriers, including the Company, must file tariffs with the FCC
listing the rates, terms and conditions of interstate and international
services provided by the carrier. On October 29, 1996, the FCC adopted an
order in which it eliminated the requirement that non-dominant interstate
carriers maintain tariffs on file with the FCC for domestic interstate
services. The FCC's order was issued pursuant to authority granted in the
Telecom Act to "forbear" from regulating any telecommunications services
provider if certain statutory analyses are satisfied. The FCC's order,
however, has been stayed by a federal court and thus, non-dominant interstate
carriers currently must continue to file interstate tariffs with the FCC.
 
  In addition, periodic reports concerning carriers' interstate circuits and
deployment of network facilities also are required to be filed. The FCC
generally does not exercise direct oversight over cost justification and the
level of charges for services of non--dominant carriers, although it has the
power to do so. The FCC also imposes prior approval requirements on transfers
of control and assignments of operating authorizations. Fines or other
penalties also may be imposed for violations of FCC rules or regulations.
 
  State Regulation. Most states regulate entry into the local exchange and
other intrastate services, and states' regulation of CLECs vary in their
regulatory intensity. The majority of states mandate that companies seeking to
provide local exchange and other intrastate services apply for and obtain the
requisite authorization from a state regulatory body, such as a state public
utility commission or a state public service commission. This authorization
process generally requires the carrier to demonstrate that it has sufficient
financial, technical, and managerial capabilities and that granting the
authorization will serve the public interest. As of July 1, 1998, the Company
had obtained local certification or was otherwise authorized to provide local
service in California, Delaware, Florida, Illinois, Indiana, Maryland,
Massachusetts, New Jersey, New York, Pennsylvania, and Virginia and had
applications pending for local certification or other authorization in the
District of Columbia, Michigan, and Washington. The Company also has authority
to provide intrastate long distance (i.e. interexchange services) in
California, Delaware, Illinois, Indiana, Maryland, Massachusetts, New Jersey,
New York, Pennsylvania and Virginia. In addition, the Company has successfully
negotiated interconnection agreements with Ameritech in Illinois and Indiana
and with Bell Atlantic in New York, New Jersey, Pennsylvania and Delaware and
Pacific Bell and GTE in California.
 
                                      45
<PAGE>
 
  As a CLEC, the Company is (and will be) subject to the regulatory directives
of each state in which the Company is (and will be) certified. Most states
require that CLECs charge just and reasonable rates and not discriminate among
similarly situated customers. Some states also require the filing of periodic
reports, the payment of various regulatory fees and surcharges, and compliance
with service standards and consumer protection rules. States also often
require prior approvals or notifications for certain transfers of assets,
customers, or ownership of a CLEC. States generally retain the right to
sanction a carrier or to revoke certifications if a carrier violates relevant-
laws and/or regulations.
 
  In most states, certificated carriers such as the Company are required to
file tariffs setting forth the terms, conditions, and prices for services
which are classified as intrastate. In some states, the required tariff may
list a range of prices for particular services, and in others, such prices can
be set on an individual customer basis. The Company, however, may be required
to file tariff addenda of the contract terms.
 
  Under the Telecom Act, implementation of the Company's plans to compete in
local markets is and will continue to be, to a certain extent, controlled by
the individual states. The states in which the Company operates or intends to
operate have taken regulatory and legislative action to open local
communications markets to various degrees of local exchange competition.
 
  Local Regulation. The Company is also subject to numerous local regulations,
such as building code requirements. These regulations may vary greatly from
state to state and from city to city.
 
EMPLOYEES
 
  As of May 28, 1998, the Company employed a total of 105 full-time employees,
none of whom were unionized. The Company believes that its future success will
depend on its continued ability to attract and retain the most highly skilled
and qualified employees in the industry. The Company believes that its
relations with its employees are good.
 
PROPERTY
 
  The Company leases office space in a number of locations, primarily for
network equipment installations and sales and administrative space. The
Company's headquarters is housed in approximately 22,300 square feet of
rentable space in downtown Chicago, Illinois, under a lease expiring in May
2003. The Company's Chicago switching and network operations center is located
in the same building as its headquarters and occupies approximately 10,500
square feet of rentable space. It is utilized under a ten-year lease that
expires in 2007 and includes two five-year options for renewal. The Company's
New York switching and network operations center occupies approximately 15,200
square feet of rentable space and is located in a commercial office building
in the downtown business district. It is utilized under a fifteen-year lease
that expires in 2012 and includes a five-year option for renewal. On January
26, 1998 the Company entered into a ten-year lease for an approximately 17,500
square foot space in a San Francisco, California office building. The space
will be used to house the Company's San Francisco switching and network
operations center. On March 10, 1998 the Company entered into a ten-year lease
and includes two five-year options for renewal for an approximately 17,600
square foot rentable space in a Philadelphia, Pennsylvania office building.
The space will be used to house the Company's Philadelphia switching and
network operations center. On May 4, 1998, the Company entered into a fifteen-
year lease for an approximately 19,500 square foot space in a Washington, D.C.
office building. The space will be used to house the Company's Washington,
D.C. switching and network operations center. On May 19, 1998, the Company
entered into a nine and one-half year lease for an approximately 19,200 square
foot space in a Los Angeles, California office building. The space will be
used to house the Company's Los Angeles switching and network operations
center.
 
LEGAL AND ADMINISTRATIVE PROCEEDINGS
 
  With the exception of the matters discussed below, the Company is not aware
of any litigation against the Company. The Company is involved in a number of
regulatory proceedings before various public utilities commissions and the
FCC.
 
                                      46
<PAGE>
 
   
  On September 16, 1997, Focal Communications Corporation of Illinois filed a
complaint and request for temporary injunction against Illinois Bell Telephone
Company d/b/a Ameritech Illinois with the ICC. The complaint was for breach of
the terms of the interconnection agreement between the parties as Ameritech
refused to pay compensation for the transport and termination of calls to
Focal end users that it believed to be ISPs. The Company has recorded revenues
and related accounts receivable totaling $3.2 million from inception to March
31, 1998 in relation to the disputed compensation. In the interests of a more
timely judgment, Focal withdrew its complaint without prejudice on October 17,
1997, and filed to intervene in a consolidated docket which included similar
complaints from several other CLECs. On March 11, 1998, the ICC issued an
order stating that Ameritech is required to pay reciprocal compensation with
respect to calls made to ISPs. On March 15, 1998, Ameritech filed a motion
with the ICC to stay the order pending an appeal, which was denied by the ICC
on March 23, 1998. On March 27, 1998, Ameritech filed suit in the United
States District Court for the Northern District of Illinois seeking reversal
of the ICC Order. Oral arguments in this matter were held on June 25, 1998.
The District Court issued its ruling on July 21, 1998, affirming the ICC's
order requiring Ameritech to pay reciprocal compensation with respect to calls
made to ISPs. The District Court also continued the ICC's stay order for an
additional 35 days. The Company anticipates that the District Court's decision
will be appealed. The Company believes that Ameritech will ultimately be
required to pay such charges after exhausting the appeal process. However,
there can be no assurance of this. Approximately eighteen other states which
have previously considered this issue have ruled in favor of the Company's
position. While the Company does not believe the long-term effects of an
adverse decision would be material, an adverse decision would have a material
adverse effect on the Company's near-term earnings. See "Risk Factors--
Reciprocal Compensation for Internet Access" and "--Regulation." The Company's
interconnection agreement with Ameritech has not been, and is not expected to
be, amended as a result of this dispute.     
   
  On July 13, 1998, Ameritech filed a complaint with the ICC, alleging that
Focal's Virtual Office service was in violation of the interconnection
agreement and state statute. Ameritech also alleged that due to Focal's
Virtual Office service, Focal was contributing to the exhaustion of numbers in
the 847 area code. Ameritech complained that calls on Focal's Virtual Office
network were circumventing local toll charges, and should not be subject to
reciprocal compensation. Ameritech also claims that the Company is offering
service in violation of the state's pay-per-call rules. The case is set for
hearing before the ICC on September 18, 1998. The Company believes that the
claims lack merit.     
 
  The Company was named as a defendant, along with other parties, in a case
involving the wrongful death of an electrician who was killed while working on
the building premises in New York (Paula Falkowski v. Signature Construction,
Inc., Focal Communications Corporation of New York, and Hugh O'Kane Electric
Company, Inc.; Index No. 122037/97, Supreme Court of the State of New York,
County of New York, amended complaint filed 4/3/98). The decedent was not
under contract with Focal, nor was he working at the request of Focal. The
Company has tendered the defense of this claim, and it has been accepted by
the insurance carrier. The Company believes that it was not the cause of the
injuries and subsequent death which gave rise to this lawsuit, and that any
liability it may have in this case would be covered by insurance and not be
material.
 
                                      47
<PAGE>
 
                                  MANAGEMENT
 
  The following table sets forth certain information with respect to certain
officers, key employees and directors of the Company as of March 31, 1998.
 
<TABLE>
<CAPTION>
NAME                      AGE                    POSITION                    SERVED SINCE
- ----                      ---                    --------                    ------------
<S>                       <C> <C>                                            <C>
EXECUTIVE OFFICERS:
Robert C. Taylor, Jr....  38  Director, President, and Chief Executive        8/96
                               Officer
John R. Barnicle........  33  Director, Executive Vice President, Chief       6/96
                               Operating Officer, and Assistant Secretary
Joseph A. Beatty........  34  Executive Vice President, Chief Financial      11/96
                               Officer, Treasurer, and Assistant Secretary
Brian F. Addy...........  33  Executive Vice President--Market Development    5/96
Renee M. Martin.........  43  Senior Vice President, General Counsel, and     3/98
                               Secretary
Robert M. Junkroski.....  34  Controller                                      1/97
KEY EMPLOYEES:
Anthony J. Leggio.......  40  Vice President and General Manager, Focal      10/97
                               Communications Corporation of New York
Tony T. Lou.............  51  Vice President and General Manager, Focal       2/98
                               Communications Corporation of Illinois
Andrew K. Robitshek.....  30  Vice President and General Manager, Focal       1/97
                               Communications Corporation of California
Richard F. Knight.......  35  Director of Sales--Telecom Services Group      11/97
Patrick K. Kuchevar.....  33  Director of Data Product Development            1/97
Daniel Montgomery, Jr...  41  Director of Network Operations                  3/97
Gary D. Sloan...........  36  Director of Information Services                2/97
Jeffrey C. Wells........  40  Director of Network Planning                    2/97
David M. Cushing........  31  Director of Product Development and             6/97
                               Business Analysis
DIRECTORS:
James E. Crawford, III..  52  Director                                       11/96
Paul T. Finnegan........  44  Director                                       11/96
Richard D. Frisbie......  48  Director                                       11/96
James N. Perry, Jr......  37  Director                                       11/96
Paul G. Yovovich........  44  Director                                        3/97
</TABLE>
 
  Robert C. Taylor, Jr. Mr. Taylor has been President, Chief Executive
Officer, and Director since August 1996. Mr. Taylor is a co-founder of the
Company. From 1994 to 1996, Mr. Taylor was the Vice President of Global
Accounts for MFS Communications Company, where he was responsible for the
operations and management of the Global Services Group, which included MFS'
fifty largest customers, and where he focused on developing all activities in
Mexico and Canada. From 1993 to 1994, Mr. Taylor was one of the original
senior executives at McLeod Telecommunications Group, a Cedar Rapids, Iowa
based CLEC. Mr. Taylor has also held management positions with MCI (1990-
1993), and Ameritech (1985-1990). Mr. Taylor also serves on the Executive
Board of the Association for Local Telecommunications Services. Mr. Taylor
received his M.B.A. from the University of Chicago Graduate School of Business
and holds a Bachelor of Science degree in Mechanical Engineering.
 
  John R. Barnicle. Mr. Barnicle has been Executive Vice President, Chief
Operating Officer, Assistant Secretary and Director since June 1996. Mr.
Barnicle is a co-founder of the Company and is responsible for day-to-day
operations, engineering, marketing and long term planning. In 1996, Mr.
Barnicle was Vice President of Marketing for MFS Telecom Companies. From 1994
to 1996, Mr. Barnicle was a Vice President of Duff &
 
                                      48
<PAGE>
 
Phelps Credit Rating Company and prior thereto held various marketing,
operations and engineering positions with MFS Telecom (1992-1994) and Centel
Corporation (1986-1992). Mr. Barnicle received his M.B.A. with Distinction
from DePaul University and holds a Bachelor of Science degree in Electrical
Engineering.
 
  Joseph A. Beatty. Mr. Beatty has been Executive Vice President, Chief
Financial Officer, Treasurer, and Assistant Secretary since November 1996. Mr.
Beatty is a co-founder of the Company and is responsible for all financial
operations and information systems. From 1994 to 1996, Mr. Beatty was a Vice
President with NationsBanc Capital Markets where he was responsible for
investment research coverage of the telecommunications industry. From 1992 to
1994, Mr. Beatty was a Vice President of Duff & Phelps Credit Rating Company
with responsibility for credit ratings in the telecommunications and electric
utility sectors. From 1985 to 1992, Mr. Beatty held various technical
management positions with Centel Corporation's local exchange carrier
division. Mr. Beatty received his M.B.A. with a concentration in Finance from
the University of Chicago Graduate School of Business and is a Chartered
Financial Analyst (CFA). In addition, Mr. Beatty holds a Bachelor of Science
degree in Electrical Engineering.
 
  Brian F. Addy. Mr. Addy has been Executive Vice President of Market
Development since May 1996. Mr. Addy is a co-founder of the Company and is
responsible for national accounts sales and market development activities.
From 1993 to 1996, Mr. Addy was a Vice President and Officer of Security
Capital Industrial Trust, where he was responsible for acquisitions,
development and national marketing. From 1986 to 1993, Mr. Addy held various
management positions with Centel Corporation's cellular, paging, telephone and
telephone systems operating units. Mr. Addy holds a Bachelor of Science degree
in Electrical Engineering.
 
  Renee M. Martin. Ms. Martin has been Senior Vice President, General Counsel
and Secretary since March 1998. Ms. Martin is responsible for legal,
regulatory, and human resources functions within the Company. From 1984 to
1998, Ms. Martin held various executive positions at Ameritech, most recently
as Vice President and General Counsel Small Business Services where she
directed corporate legal resources to address contract negotiations,
employment issues, regulatory affairs and litigation, as well as managing
outside legal counsel. From 1982 to 1984, Ms. Martin was an attorney at Cook
and Franke, S.C. where she concentrated on general business and corporate law.
Ms. Martin received her J.D. from the University of Wisconsin and holds a
Bachelor of Arts degree in Journalism.
 
  Robert M. Junkroski. Mr. Junkroski has been Controller since January 1997.
Mr. Junkroski is responsible for all internal accounting operations. From 1995
to 1997, Mr. Junkroski was Controller for Brambles Equipment Services, Inc.,
where he was responsible for establishing and maintaining the divisional
accounting, financial reporting, and budgeting function. From 1987 to 1994,
Mr. Junkroski was Controller for Focus Group, Ltd., where he was responsible
for the development and implementation of the accounting and financial
reporting functions of several emerging companies. Mr. Junkroski is a
Certified Public Accountant, received his M.B.A. with honors from Roosevelt
University concentrating in Finance and Accounting and holds a Bachelor of
Business Administration degree.
 
  Anthony J. Leggio. Mr. Leggio has been Vice President and General Manager,
Focal Communications Corporation of New York since October 1997. Mr. Leggio is
responsible for sales and customer service activities in the Company's New
York operation. From 1996 to 1997, Mr. Leggio was Vice President Sales,
Eastern Region for Sprint PCS where he was responsible for planning,
development, organization and implementation of the Fortune 1000 sales and
support organization. From 1988 to 1996, Mr. Leggio held various management
positions with Sprint Corporation; most recently as Regional Director of
national accounts for Sprint's long distance division in the New York area.
Mr. Leggio received his M.B.A. from St. Joseph's University and holds a
Bachelor of Science degree in Marketing.
 
  Tony T. Lou. Mr. Lou has been Vice President and General Manager, Focal
Communications Corporation of Illinois since February, 1998. Mr. Lou is
responsible for sales and customer service activities in the Company's Chicago
operation. From 1996 to 1997, Mr. Lou was Vice President, Corporate Accounts
for Safety-Kleen Corporation where he was responsible for developing a
national accounts strategy, quotas, account plans
 
                                      49
<PAGE>
 
and increasing sales throughout all product lines. From 1990 to 1996, Mr. Lou
held various management positions with Sprint Corporation, most recently as
Regional Director of national accounts for Sprint's long distance division in
the Chicago area. Mr. Lou received his Masters in Management from the Kellogg
Graduate School of Business at Northwestern University and holds a Bachelor of
Commerce degree.
 
  Andrew K. Robitshek. Mr. Robitshek has been with the Company since January
1997 and has been Vice President and General Manager, Focal Communications
Corporation of California since April 1998. Mr. Robitshek is responsible for
sales and customer service activities in the Company's San Francisco
operation. From 1994 to 1996, Mr. Robitshek was Director of Business Analysis
for MFS Communications Company where he was responsible for determining the
economics of local telephone service. From 1991 to 1993, Mr. Robitshek was
with MCI where he was responsible for business analysis and VNET Marketing.
Mr. Robitshek received his Masters in Management from the Kellogg Graduate
School of Business at Northwestern University, a Masters of Science in
Telecommunications from George Washington University and holds a Bachelor of
Science degree in Industrial Management.
 
  Richard F. Knight. Mr. Knight has been Director of Sales-Telecom Services
Group since November 1997. Mr. Knight is responsible for managing sales and
service activities to other carriers on a nationwide basis. From 1988 to 1997,
Mr. Knight held various management positions at MCI Telecommunications, most
recently as Senior Manager-Carrier Product Marketing and Development. Mr.
Knight received his M.B.A. from DePaul University and holds a Bachelor of
Business Administration degree.
 
  Patrick K. Kuchevar. Mr. Kuchevar has been with the Company since January
1997, and has served as Director of Data Product Development since March 1998.
Mr. Kuchevar is responsible for managing sales and service activities to large
Internet service providers on a nationwide basis and for data product
development across all customer groups. From 1992 to 1997, Mr. Kuchevar held
various management positions at Sprint, most recently as Global Account
Manager in the long-distance division. From 1988 to 1992, Mr. Kuchevar was
responsible for the marketing of X.25-based data switching services for
Sprint's local telecom division in Illinois. Mr. Kuchevar holds a Bachelor of
Business Administration degree.
 
  Daniel Montgomery, Jr. Mr. Montgomery has been Director of Network
Operations since March 1997. Mr. Montgomery is responsible for coordinating
the implementation of Focal's transmission network. From 1988 to 1997, Mr.
Montgomery held several management positions with MFS Communications Company
including Director--Client Network Engineering and Senior Manager--Network
Services. From 1987 to 1988, Mr. Montgomery was Senior Communications Analyst
for Sears Communications Network, Inc. Mr. Montgomery received his Masters of
Science in Computer Science with Distinction from DePaul University and holds
a Bachelor of Arts degree in Economics.
 
  Gary D. Sloan. Mr. Sloan has been Director of Information Services since
February 1997. Mr. Sloan is responsible for managing all aspects of the
Company's information systems. From 1995 to 1997, Mr. Sloan was Director of
Software Development, Billing Division, MIS for MFS Communications Company
where he was responsible for implementing a new corporate billing platform.
From 1988 to 1995, Mr. Sloan was Director of System Development, MIS for MFS
Telecom where he was responsible for the implementation and operation of
management information systems. From 1984 to 1988, Mr. Sloan was a consultant
for Andersen Consulting. Mr. Sloan holds a Bachelor of Science degree in
Computer Science.
 
  Jeffrey C. Wells. Mr. Wells has been Director of Network Planning since
February 1997. Mr. Wells is responsible for implementing Focal's network
interconnection with the ILECs and engineering the Company's switches for
local network facilities. From 1995 to 1997, Mr. Wells was Senior Manager--
Local Network Planning/Implementation for MFS Communications Company where he
was responsible for designing and implementing all phases of the local
networks as well as overseeing interconnections with the ILECs. From 1985 to
1995, Mr. Wells held various technical management positions with
Sprint/Centel, including Manager of Central Offices for Sprint's local
telephone operations in Chicago. Mr. Wells holds an Associate in Electronic
Technology degree.
 
                                      50
<PAGE>
 
  David M. Cushing. Mr. Cushing has been Director of Product Development and
Business Analysis since June 1997. Mr. Cushing is responsible for all aspects
of developing and implementing new products as well as the pricing and
financial analysis of new services. From 1995 to 1997, Mr. Cushing held
various management positions at WorldCom (MFS Communications Company) most
recently as Senior Manager, Business Analysis. From 1988 to 1995, Mr. Cushing
held several positions at GTE/Contel most recently as Budget and Performance
Analyst where he initiated performance analyses and designed reports to
monitor customer service performance. Mr. Cushing received his M.B.A. from the
University of Chicago and holds a Bachelor of Science degree in General
Engineering.
 
  James E. Crawford, III. Mr. Crawford is a Director. Mr. Crawford has served
as a Director of the Company since November, 1996. He is a general partner of
Frontenac Company, a venture capital firm that he joined in August, 1992. From
February, 1984 to August, 1992, Mr. Crawford was a general partner of William
Blair Venture Management Co., the general partner of William Blair Venture
Partners III, a venture capital fund. He was also a general partner of William
Blair & Company, an investment bank and brokerage affiliated with William
Blair Venture Management Co., from January, 1987 to August, 1992. Mr. Crawford
serves as a director of Optika Imaging Systems, Inc., Cornerstone Imaging,
Inc., Allegiance Telecom, Inc. and several other private companies.
 
  Paul J. Finnegan. Mr. Finnegan is a Director. Mr. Finnegan has served as a
Director of the Company since November, 1996. Since January, 1993, Mr.
Finnegan has been Vice President of Madison Dearborn Partners, Inc., the
general partner of Madison Dearborn Capital Partners, L.P. Previously, he
served in various positions at First Capital Corporation of Chicago and its
affiliates. Mr. Finnegan currently serves on the Board of Trustees of The
Skyline Fund, the Board of Advisors of Falcon Cable Holding Group, L.P., the
Board of Directors of Omnipoint Corporation, and the Board of Directors of
Allegiance Telecom Inc.
 
  Richard D. Frisbie. Mr. Frisbie is a Director. Mr. Frisbie has served as a
Director of the Company since November, 1996. Mr. Frisbie is a founder and
Managing Partner of Battery Ventures. He is responsible for management of the
Battery Funds and focuses principally on communications and software
opportunities. From 1976 to 1983, Mr. Frisbie was a principal at UNC Ventures
("UNC"), where he was instrumental in developing and implementing its high
technology investment strategy. Prior to joining UNC, Mr. Frisbie was employed
at Hutchins & Wheeler (1974-1976), a Boston law firm. Mr. Frisbie serves as a
director of Allegiance Telecom, PCS Development, Phoenix Wireless and UniSite
and is a member of the Board of Directors of the National Venture Capital
Association.
 
  James N. Perry, Jr. Mr. Perry is a Director. Mr. Perry has been a Director
of the Company since November, 1996. In January, 1993, he became Vice
President of Madison Dearborn Partners, Inc. Previously, Mr. Perry served in
various positions at First Capital Corporation of Chicago and its affiliates.
Mr. Perry currently serves as a director of Clearnet Communications, Inc.,
Omnipoint Corporation, and Allegiance Telecom Inc.
 
  Paul G. Yovovich. Mr. Yovovich is a Director. Mr. Yovovich has served as a
Director of the Company since March 1997. Mr. Yovovich served as President of
Advance Ross Corporation from 1993 to 1996. He served in several executive
positions with Centel Corporation from 1982 to 1992, where his last position
was that of President of its Central Telephone Company unit. Before joining
Centel, he was a Vice President in the investment banking unit of Dean Witter.
Mr. Yovovich also serves as a director of 3Com Corporation, APAC TeleServices,
Inc., May & Speh, Inc., Comarco, Inc., and Mastering, Inc.
 
TERM OF OFFICE FOR DIRECTORS AND OFFICERS
 
  Pursuant to Article II, Section 1 of the Company's By-laws (the "By-laws"),
the stockholders of the Company shall elect the members of the Board of
Directors at the annual meeting of the stockholders to be held each year
within 180 days after the close of the immediately preceding fiscal year of
the Company. Pursuant to
 
                                      51
<PAGE>
 
Article III, Section 2 of the By-laws, the directors shall be elected by a
plurality of the votes of the shares present in person or represented by proxy
at the annual meeting and entitled to vote in the election of directors. Each
director elected shall hold office until his or her successor is duly elected
and qualified or until his or her earlier death, resignation or removal.
 
  Pursuant to Article IV, Sections 1 and 2 of the By-laws, the Board of
Directors shall annually elect the officers of the Company at its first
meeting held after each annual meeting of the stockholders. Each officer
elected shall hold office until his or her successor is duly elected and
qualified or until his or her earlier, death, resignation or removal.
 
POTENTIAL CONFLICTS OF INTEREST
 
  In addition to serving as members of the Board of the Company, Messrs.
Crawford, Finnegan, Frisbie and Perry each serve as directors of other
telecommunications companies and other private companies. As a result of these
additional directorships, Messrs. Crawford, Finnegan, Frisbie and Perry may be
subject to conflicts of interest during their tenure as directors of the
Company. Because of these potential conflicts, Messrs. Crawford, Finnegan,
Frisbie and Perry may be required, from time to time, to disclose certain
financial or business opportunities to the Company and to the other companies
to which they owe fiduciary duties. However, the Company does not believe
these conflicts of interest will be a detriment to the Company's growth or
ability to operate its business. Currently the Corporation does not have any
standard procedures for resolving potential conflicts of interest relating to
corporate opportunities or otherwise.
 
BOARD COMMITTEES
 
  The Board has established a Compensation Committee and an Audit Committee.
The Compensation Committee establishes salaries, incentives and other forms of
compensation for directors, executive officers and key employees of the
Company and administers the Company's 1997 Non-Qualified Stock Option Plan
(the "Stock Option Plan") and other incentive and benefit plans. Members of
the Compensation Committee are Messrs. Taylor, Perry, Finnegan, Crawford,
Frisbie, and Yovovich. The Audit Committee oversees the work performed by the
Company's independent auditors, and reviews internal audit controls. Members
of the Audit Committee are Messrs. Perry, Finnegan, Crawford, and Frisbie. The
Nominating Committee has been charged with the responsibility of identifying
nominees to stand for election to the Company's Board of Directors. Members of
the Nominating Committee are Messrs. Barnicle, Perry, Crawford and Yovovich.
 
COMPENSATION OF DIRECTORS
 
  Except for Mr. Yovovich, outside directors do not currently receive cash
fees or option grants for serving as directors or for attending meetings. On
April 1, 1997, Mr. Yovovich was awarded an option to purchase 260 shares of
the Company's Class A Common (as defined herein), with such option to
immediately vest as to 10% of such shares and to vest as to an additional 15%
of such shares each six months thereafter. The Company reimburses directors
for out-of-pocket expenses incurred in connection with attendance at meetings.
 
                                      52
<PAGE>
 
EXECUTIVE COMPENSATION
 
  The Summary Compensation Table below sets forth certain information
concerning compensation paid or accrued for services rendered to the Company
in all capacities for the seven months ended December 31, 1996 and the year
ended December 31, 1997 by the Chief Executive Officer and each of the four
other most highly compensated officers or key employees of the Company whose
combined salary and bonus exceeded $100,000 (collectively, the "Named
Executive Officers").
 
                          SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                 LONG-TERM
                                                                COMPENSATION
                                    ANNUAL COMPENSATION            AWARDS
                               -------------------------------- ------------
                                                                 NUMBER OF
                                                      OTHER      SECURITIES
NAME AND                                              ANNUAL     UNDERLYING   ALL OTHER
PRINCIPAL POSITION        YEAR  SALARY   BONUS     COMPENSATION   OPTIONS    COMPENSATION
- ------------------        ---- -------- -------    ------------ ------------ ------------
<S>                       <C>  <C>      <C>        <C>          <C>          <C>
Robert C. Taylor, Jr. ..  1997 $120,000 $50,000(2)    $  --         --          $ --
 Chief Executive Officer  1996   20,000     --           --         --            --
 and President
John R. Barnicle........  1997  120,000  47,000(2)       --         --            --
 Executive Vice           1996   20,000     --           --         --            --
 President and Chief
 Operating Officer
Joseph A. Beatty........  1997  120,000  45,000(2)    25,000(1)     --            --
 Executive Vice           1996   20,000     --           --         --            --
 President, Chief
 Financial Officer,
 Treasurer, and
 Secretary
Brian F. Addy...........  1997  120,000  38,000(2)       --         --            --
 Executive Vice           1996   20,000     --           --         --            --
 President of Market
 Development
Patrick K. Kuchevar.....  1997   63,333  87,000(3)       --          80(4)        --
 Director of Data         1996      --      --           --         --            --
 Product Development
</TABLE>
- --------
(1) Reimbursement for moving expenses.
(2) Discretionary bonuses are granted by the Board of Directors.
(3) Performance Based Sales Compensation Plan.
(4) Granted pursuant to the Company's Stock Option Plan.
 
  Mr. Kuchevar is not an officer of the Company. Except for Mr. Kuchevar, none
of the Named Executive Officers (as defined) owns any options to purchase
shares of the Company's Common Stock.
 
STOCK OPTION PLAN
 
  The Company's Stock Option Plan was adopted on February 27, 1997 by Focal
Communications Corporation of Illinois and pursuant to a Plan of
Reorganization and an Assignment of Interest Agreement, dated August 18, 1997,
such plan was adopted by the Company. The Stock Option Plan provides for the
grant of options to purchase up to an aggregate of 5,260 shares of Common
Stock. The Plan is administered by the Board of Directors which makes
discretionary grants ("discretionary grants") of options to employees
(including employees who are officers and directors of the Company) and
directors.
 
  Options granted pursuant to the plan are to be non-qualified options and are
not intended to be "incentive stock options" within the meaning of Section
422A of the Internal Revenue Code of 1986, as amended.
 
  The selection of participants, allotment of shares, determination of price
and other conditions of purchase of such options are determined by the Board,
in its sole discretion. Options are exercisable for a period of up to ten
years. The per share exercise price of options must be no less than 100% of
the fair market value of the Common Stock on the date of grant. As of June 1,
1998, the Board had granted options to purchase a net total of 2,926 shares of
the Company's Class A Common to 77 employees and directors pursuant to the
Stock Option Plan, after taking into account forfeited option grants. As of
December 31, 1997, the Board had granted options to purchase 1,222 shares of
Class A Common at prices ranging from $290 to $320 per share. On January 1,
1998,
 
                                      53
<PAGE>
 
the Board granted additional options to purchase 677 shares of Class A Common
at $333 per share. On April 1, 1998, the Board granted additional options to
purchase 1,057 shares of Class A Common at $1,050 per share.
 
  Options granted under the Stock Option Plan are nontransferable, other than
by will or by the laws of descent and distribution, and during the lifetime of
the optionee, may be exercised only by the optionee, or in the event of
optionee's legal incapacity to do so, by the optionee's guardian or legal
representative.
 
  The following table sets forth certain information with respect to options
granted to the Named Executive Officers during 1997.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                               INDIVIDUAL GRANTS
                         --------------------------------------------------------------
                          NUMBER OF
                         SECURITIES  PERCENT OF TOTAL
                         UNDERLYING  OPTIONS GRANTED  EXERCISE              GRANT
                           OPTIONS     TO EMPLOYEES     PRICE   EXPIRATION   DATE
NAME                     GRANTED (#)     IN 1997      ($/SH)(1)    DATE    VALUE(2)
- ----                     ----------- ---------------- --------- ---------- --------
<S>                      <C>         <C>              <C>       <C>        <C>      <C>
Robert C. Taylor, Jr....      --              0%        $--           --   $   --
John R. Barnicle........      --              0%         --           --       --
Joseph A. Beatty........      --              0%         --           --       --
Brian F. Addy...........      --              0%         --           --       --
Patrick Kuchevar........      80           6.55%         290     04/01/07   13,600
</TABLE>
- --------
(1) Options were granted under the Stock Option Plan at an exercise price
    equal to the fair market value of the Company's Class A Common on the date
    of grant, as determined by the Board.
(2)Calculation based on the Black-Scholes model.
 
  The following table sets forth certain information with respect to the
unexercised options held by the Named Executive Officers as of December 31,
1997. No options were exercised by the Named Executive Officers during 1997.
 
                            YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                     NUMBER OF
                                                     SECURITIES        VALUE OF
                                                     UNDERLYING     UNEXERCISED IN-
                                                    UNEXERCISED        THE-MONEY
                                                  OPTIONS AT YEAR- OPTIONS AT YEAR-
                                                    END 1997(#)       END 1997($)
                         SHARES ACQUIRED  VALUE     EXERCISABLE/     EXERCISABLE/
NAME                     ON EXERCISE (#) REALIZED  UNEXERCISABLE   UNEXERCISABLE (1)
- ----                     --------------- -------- ---------------- -----------------
<S>                      <C>             <C>      <C>              <C>
Robert C. Taylor, Jr....        --         $--           --             $   --
John R. Barnicle........        --          --           --                 --
Joseph A. Beatty........        --          --           --                 --
Brian F. Addy...........        --          --           --                 --
Patrick Kuchevar........         0           0          0/80            0/3,600
</TABLE>
- --------
(1) As of the end of fiscal year 1997, none of the options held by the Named
    Executive Officers had been exercised.
 
EMPLOYMENT AGREEMENTS
 
  The Company entered into continuing Executive Stock Agreement and Employment
Agreements (the "Employment Agreements") with each of the Executive Investors
(as defined herein) on of November 27, 1996 upon the same terms and
conditions. The Employment Agreements provide that each Executive Investor
shall receive a minimum base salary of $120,000 and bonuses based upon the
Company achieving certain performance goals set in advance of each year in the
sole discretion of the Board of Directors. Each Executive Investor is entitled
to severance payments if he is terminated other than for cause. In addition to
provisions relating to each Executive Investor's duties and compensation, the
Employment Agreements require each Executive Investor to
 
                                      54
<PAGE>
 
   
assign all inventions he develops in the course of his employment with the
Company to the Company, maintain the confidentiality of the Company's
proprietary information and refrain from competing with and soliciting
employees from the Company during his employment with the Company and for a
period of up to eighteen months thereafter. Each Executive Investor is
entitled to certain Noncompete Compensation. The Company entered into an
employment agreement with Ms. Martin on March 20, 1998 and Mr. Robitshek on
July 15, 1998, on substantially the same employment terms as the Executive
Investors.     
 
                   SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
                             OWNERS AND MANAGEMENT
 
  The following table sets forth information regarding beneficial ownership of
the Company's Common Stock as of June 1, 1998 for (i) each of the Company's
Officers and others included within the Named Executive Officers, (ii) each
director of the Company, (iii) all of the persons named in (i) or (ii) as a
group, and (iv) each stockholder of the Company who beneficially owns 5% or
more of the Company's Common Stock.
 
<TABLE>
<CAPTION>
                                                  NUMBER OF SHARES PERCENT OF
                                                    BENEFICIALLY   OUTSTANDING
NAME                                                  OWNED(1)       SHARES
- ----                                              ---------------- -----------
<S>                                               <C>              <C>
OFFICERS OR KEY EMPLOYEES:
Robert C. Taylor, Jr.(2).........................      5,230.77        4.54%
John R. Barnicle(3)..............................      5,230.77        4.54%
Joseph A. Beatty(4)..............................      5,230.77        4.54%
Brian F. Addy(5).................................      5,230.77        4.54%
Robert M. Junkroski(6)...........................         17.50           *
Renee M. Martin..................................          0.00           *
Patrick Kuchevar(7)..............................         20.00           *
DIRECTORS:
James N. Perry Jr.(8)............................     54,807.70       47.55%
Paul Finnegan(9).................................     54,807.70       47.55%
James Crawford(10)...............................     25,576.92       22.19%
Richard Frisbie(11)..............................     12,788.46       11.10%
Paul G. Yovovich(12).............................        334.77           *
ALL OFFICERS AND DIRECTORS AS A GROUP (10 STOCK-
 HOLDERS)........................................    114,450.93       99.30%
5% STOCKHOLDERS:
Madison Dearborn Capital Partnership, L.P.(13)...     54,807.70       47.55%
Frontenac VI, L.P.(14)...........................     25,576.92       22.19%
Battery Ventures III, L.P.(15)...................     12,788.46       11.10%
</TABLE>
- --------
* Less than 1% of the issued and outstanding shares of the Common Stock of the
Company.
 
(1)  Unless otherwise indicated below, the persons and entities named in the
     table have sole voting and sole investment power with respect to all
     shares beneficially owned by them, subject to community property laws
     where applicable. The percentage of beneficial ownership is based on
     115,260.983 shares of Common Stock outstanding as of June 1, 1998,
     including 241.75 shares of Common Stock subject to options that are
     currently exercisable or are exercisable within 60 days, which are deemed
     to be outstanding and to be beneficially owned by the person holding such
     options.
(2)  Includes 230.77 shares of Class A Common and 5,000 shares of Class B
     Common, but excludes 3,677.885 shares of Class C Common owned of record
     by Mr. Taylor. The voting rights with respect to the Class C Common have
     been transferred to the Equity Investors pursuant to the Vesting
     Agreements (as hereinafter defined). The Class C Common and 3,000 shares
     of Class B Common are subject to forfeiture. See "Description of Capital
     Stock."
(3)  Includes 230.77 shares of Class A Common and 5,000 shares of Class B
     Common, but excludes 3,677.885 shares of Class C Common owned of record
     by Mr. Barnicle. The voting rights with respect to the Class C Common
     have been transferred to the Equity Investors pursuant to the Vesting
     Agreements. The Class C Common and 3,000 shares of Class B Common are
     subject to forfeiture. See "Description of Capital Stock."
 
                                      55
<PAGE>
 
(4)  Includes 230.77 shares of Class A Common and 5,000 shares of Class B
     Common, but excludes 3,677.885 shares of Class C Common owned of record
     by Mr. Beatty. The voting rights with respect to the Class C Common have
     been transferred to the Equity Investors pursuant to the Vesting
     Agreements. The Class C Common and 3,000 shares of Class B Common are
     subject to forfeiture. See "Description of Capital Stock."
(5)  Includes 230.77 shares of Class A Common and 5,000 shares of Class B
     Common, but excludes 3,677.885 shares of Class C Common owned of record
     by Mr. Addy. The voting rights with respect to the Class C Common have
     been transferred to the Equity Investors pursuant to the Vesting
     Agreements. The Class C Common and 3,000 shares of Class B Common are
     subject to forfeiture. See "Description of Capital Stock."
(6)  Includes 17.5 shares of Class A Common subject to options which are
     exercisable within 60 days of June 1, 1998. Excludes 96.5 shares of Class
     A Common subject to options which are not exercisable within 60 days of
     June 1, 1998.
(7)  Includes 20 shares of Class A Common subject to options which are
     exercisable within 60 days of June 1, 1998. Excludes 100 shares of Class
     A Common subject to options which are not exercisable within 60 days of
     June 1, 1998. Mr. Kuchevar is not an officer of the Company. He is
     included in the table because he is part of the group defined as Named
     Executive Officers in the Summary Compensation Table.
(8)  Mr. Perry, a director of the Company, owns no shares in his own name.
     Includes 46,153.85 shares of Class A Common owned by MDCP and 8,653.85
     shares of Class C Common, the voting rights with respect to which have
     been transferred to MDCP pursuant to the Vesting Agreements. See
     "Description of Capital Stock." Mr. Perry's address is c/o Madison
     Dearborn Partners, Inc., Three First National Plaza, Suite 3800, Chicago,
     IL 60602.
(9)  Mr. Finnegan, a director of the Company, owns no shares in his own name.
     Includes 46,153.85 shares of Class A Common owned by MDCP and 8,653.85
     shares of Class C Common, the voting rights with respect to which have
     been transferred to MDCP pursuant to the Vesting Agreements. See
     "Description of Capital Stock." Mr. Finnegan's address is c/o Madison
     Dearborn Partners, Inc., Three First National Plaza, Suite 3800, Chicago,
     IL 60602.
(10)  Mr. Crawford, a director of the Company, owns no shares in his own name.
      Includes 21,538.46 shares of Class A Common owned by Frontenac and
      4,038.46 shares of Class C Common, the voting rights with respect to
      which have been transferred to Frontenac pursuant to the Vesting
      Agreements. See "Description of Capital Stock." Mr. Crawford's address
      is c/o Frontenac Company, 135 S. LaSalle Street, Suite 3800, Chicago, IL
      60603.
(11)  Mr. Frisbie, a director of the Company, owns no shares in his own name.
      Includes 10,769.23 shares of Class A Common owned by Battery and
      2,019.23 shares of Class C Common, the voting rights with respect to
      which have been transferred to Battery pursuant to the Vesting
      Agreements. See "Description of Capital Stock." Mr. Frisbie's address is
      c/o Battery Ventures, 20 William Street, Wellesley, MA 02181.
(12)  Includes 230.77 shares of Class A Common and an additional 104 shares of
      Class A Common subject to options which are exercisable within 60 days
      of June 1, 1998. Excludes 156 shares of Class A Common subject to
      options which are not exercisable within 60 days of June 1, 1998.
(13)  Includes 46,153.85 shares of Class A Common owned by MDCP and 8,653.85
      shares of Class C Common, the voting rights with respect to which have
      been transferred to MDCP pursuant to the Vesting Agreements. See
      "Description of Capital Stock." To the Company's knowledge Mr. Perry and
      Mr. Finnegan, directors of the Company, have the power to vote the
      shares owned by MDCP. See "Management--Potential Conflicts of Interest."
(14)  Includes 21,538.46 shares of Class A Common owned by Frontenac and
      4,038.46 shares of Class C Common, the voting rights with respect to
      which have been transferred to Frontenac pursuant to the Vesting
      Agreements. See "Description of Capital Stock." To the Company's
      knowledge Mr. Crawford, a director of the Company, has the power to vote
      the shares owned by Frontenac. See "Management--Potential Conflicts of
      Interest."
(15)  Includes 10,769.23 shares of Class A Common owned by Battery and
      2,019.23 shares of Class C Common, the voting rights with respect to
      which have been transferred to Battery pursuant to the Vesting
      Agreements. See "Description of Capital Stock." To the Company's
      knowledge Mr. Frisbie, a director of the Company, has the power to vote
      the shares owned by Battery. See "Management--Potential Conflicts of
      Interest."
 
                                      56
<PAGE>
 
                             CERTAIN TRANSACTIONS
 
THE STOCK PURCHASE AGREEMENT
 
  The Company and certain of its stockholders entered into a Stock Purchase
Agreement (as defined herein). Pursuant to such agreement and additional
agreements related thereto the Investors were granted certain put rights,
voting rights, and registration rights. See "Description of Capital Stock" for
a detailed discussion of the various rights and restrictions affecting the
Common Stock of the Company and its stockholders. Concurrent with the
consummation of the Offering, the Equity Investors relinquished certain Put
Rights (as defined herein) in exchange for certain liquidation rights. See
"Description of Capital Stock."
 
DIRECTOR/STOCKHOLDER RELATIONSHIPS
 
  Several directors of the Company, who serve as designees of the Equity
Investors, also serve on the boards of companies with which the Company may
compete or enter into agreements. Specifically, Messrs. Crawford, Finnegan,
Frisbie, and Perry are directors of Allegiance Telecom, Inc., a Dallas-based
CLEC which competes with the Company. See "Management--Potential Conflicts of
Interest."
 
                         DESCRIPTION OF CAPITAL STOCK
 
  As of December 31, 1997, there were a total of (i) 85,567.693 shares of
Class A Common authorized and 80,307.693 shares outstanding, (ii) 35,000
shares of Class B Common authorized and 20,000 shares outstanding, and (iii)
15,000 shares of Class C Common authorized and 14,711.54 shares outstanding.
 
  Pursuant to a Stock Purchase Agreement (the "Stock Purchase Agreement") and
related documents, each dated November 27, 1996, the Company sold 79,384.62
shares of its Class A Common Stock, $0.01 par value per share (the "Class A
Common"), to MDCP, Frontenac, Battery, Brian F. Addy ("Addy"), John R.
Barnicle ("Barnicle"), Joseph A. Beatty ("Beatty"), and Robert C. Taylor, Jr.
("Taylor," with Addy, Barnicle, Beatty and Taylor being hereinafter
individually referred to as an "Executive Investor" and collectively as the
"Executive Investors," and the Equity Investors and the Executive Investors
being hereinafter collectively referred to as the "Investors") and converted
1,500 shares of its then outstanding common stock into 20,000 shares of Class
B Common Stock, $0.01 par value per share (the "Class B Common"), and
14,711.54 shares of Class C Common Stock, $0.01 par value per share (the
"Class C Common," the Class A Common, Class B Common and Class C Common are
hereinafter collectively referred to as the "Common Stock"). The Company
issued 923.073 shares of Class A Common to stockholders who were designated by
the Equity Investors and other investors concurrent with the Stock Purchase
Agreement.
 
  In connection with the Stock Purchase Agreement, the Company and the
Investors entered into a number of additional agreements which affect their
relative rights as Stockholders of the Company. Following is a description of
the relative rights and obligations of the Company's Class A Common, Class B
Common and Class C Common.
 
 Certain Voting Requirements
 
  Pursuant to the Stock Purchase Agreement, the Company can not take certain
enumerated actions without obtaining the prior written consent of the holders
of at least 67% of the shares of Class A Common issued to Equity Investors
pursuant to the Stock Purchase Agreement. Until such consent is obtained the
Company may not, among other things: declare or pay dividends; redeem or
purchase the Company's stock or the stock of any of its subsidiaries; issue or
agree to issue any securities containing equity features; sell more than 10%
of the Company's assets; acquire or invest in another entity; enter into the
operation of any business other than the provision of local exchange
telecommunications services or other businesses identified in an approved
business plan; become subject to any agreement which would restrict the
Company's right to perform under the Stock Purchase Agreement or related
documents; incur indebtedness exceeding $100,000 (excluding the Notes and any
 
                                      57
<PAGE>
 
refinancing thereof); make capital expenditures or enter into lease agreements
exceeding $100,000 in any twelve-month period unless provided for in an
approved business plan; or use proceeds of Class A Common contributions made
pursuant to the Stock Purchase Agreement for purposes other than for working
capital and budgeted general corporate purposes or as contemplated by an
approved business plan. The requirement for such consent terminates upon the
consummation of the Company's Initial Public Offering.
 
 Voting
 
  Pursuant to the Company's Certificate of Incorporation (the "Certificate"),
each share of Common Stock is entitled to one vote per share with the holders
of Class A Common, Class B Common and Class C Common voting together as a
single class.
 
  Pursuant to the Vesting Agreement, the Executives have named the Equity
Investors as their proxies to vote all shares of Unvested Class C Common from
time-to-time outstanding. In addition, pursuant to the Stockholders Agreement,
the Stockholders have agreed, among other things, that the authorized number
of directors shall be established by the bylaws and remain at seven directors.
The Stockholders Agreement provides that the seven directors will include (i)
two directors designated by MDCP, so long as MDCP holds at least 50% of the
shares of Common Stock initially purchased by MDCP under the Stock Purchase
Agreement and thereafter one director designated by MDCP so long as MDCP holds
at least 10% of such Common Stock and at least 3% of the Company's outstanding
Common Stock, (ii) one director designated by Frontenac so long as Frontenac
holds at least 20% of the shares of Common Stock initially purchased by
Frontenac under the Stock Purchase Agreement and at least 3% of the Company's
outstanding Common Stock, (iii) one director designated by Battery so long as
Battery holds at least 50% of the shares of Common Stock initially purchased
by Battery under the Stock Purchase Agreement and at least 3% of the Company's
outstanding Common Stock, (iv) two Executive Investors employed by the Company
designated by a majority of the outstanding shares of Common Stock issued to
the Executive Investors pursuant to the Stock Purchase Agreement, and (v) one
outside director designated by the Equity Investors and reasonably acceptable
to the Executive Investors. The rights and requirements under the Stockholders
Agreements as to directors shall terminate at the earlier of the closing of
the Company's Initial Public Offering or the sale of the Company.
 
 Investors' Liquidation Right
 
  Pursuant to the Stock Purchase Agreement, Equity Investors had the right
(the "Put Right"), beginning after November 27, 2003, to require the Company
to repurchase all, but not less than all, of the Equity Investors' Class A
Common purchased pursuant to the Stock Purchase Agreement. Pursuant to a
January 1998 amendment to the Stock Purchase Agreement the Investors have
agreed to relinquish such Put Right in exchange for certain rights to require
liquidation of the Company if the Company has not completed a public offering
of its Common Stock prior to November 27, 2003. If a demand for liquidation is
made, at the option of the Company, in lieu of liquidation, the Company may
repurchase all, but not less than all, the shares of the Company's capital
stock then held by the Investors exercising such liquidation right. The
Indenture limits the ability of the Company to liquidate itself or to
repurchase shares of its Common Stock. In connection with the Offering, the
Equity Investors have acknowledged that the Indenture could restrict the
Company from liquidating or repurchasing Shares of its Common Stock and agreed
in writing that any claim for such payments would be subordinated in right of
payment to the Notes.
 
 Forfeiture, Conversion and Repurchase of Common Stock
 
  Pursuant to the terms of four separate Vesting Agreements (the "Vesting
Agreements"), each dated November 27, 1996, by and among the Executive
Investors and each of the Equity Investors, the shares of Class C Common owned
by each of the Executive Investors are subject to certain forfeiture
provisions.
 
  Upon the vesting of the Class C Common, such shares of Class C Common are
convertible into Class B Common. Pursuant to the Vesting Agreements, upon the
vesting of any shares of Class C Common an equal number of shares of Class A
Common held by the Equity Investors shall be forfeited by such Equity
Investors.
 
                                      58
<PAGE>
 
  Pursuant to the terms of the Employment Agreements by and between the
Company and each of the Executive Investors, the shares of Class B Common
owned by each of the Executive Investors (including any shares of Class B
Common received upon conversion of the Class C Common as to which the vesting
provisions of the Vesting Agreement have lapsed) are subject to certain
forfeiture provisions.
 
  Pursuant to the Employment Agreements, the Company has the option to
purchase (the "Repurchase Option") all Class A Common, Class B Common and
Class C Common then owned by each Executive Investor upon the termination of
such Executive Investors' employment by the Company for any reason. In certain
circumstances, the Company may be required to assign the Repurchase Option, or
a portion thereof, to the Equity Investors and/or the other Executive
Investors. The purchase price for shares of Unvested Class B and Unvested
Class C shall be the par value thereof. The purchase price for the vested
shares of Common Stock shall be the fair market value of such shares as
determined by the formula set forth in the Employment Agreements.
 
 Registration Rights
 
  Pursuant to the terms of a Registration Agreement (the "Registration
Agreement") dated November 27, 1996, the Company granted certain holders of
the Company's Class A Common and Class B Common Registration Rights. The
holders of approximately 78,461.54 shares of Class A Common have the benefit
of demand registration rights. Holders of Class A Common which have the
benefit of demand registration rights are hereinafter referred to as "Demand
Rights Holders." In order for the Demand Rights Holders to effect a demand for
registration prior to an Initial Public Offering, the Registration Agreement
requires that at least 67% of the Demand Rights Holders request such
registration. Prior to an Initial Public Offering, an unlimited number of
demands may be made for registration on Form S-1 or any similar long-form
registration ("Long-Form Registrations"). After an Initial Public Offering and
subject to minimum dollar limits, each Demand Rights Holder is subject to
certain limitations on demands which can be made for Long-Form Registrations,
while the Demand Rights Holders may make an unlimited number of demands for
registration on Form S-2 or S-3 or any similar short-form registration, if
available. In addition to demand registration rights, the Demand Rights
Holders and the holders of approximately 20,000 shares of Class B Common have
unlimited "piggyback" registration rights (hereinafter the Demand Rights
Holders and the holders of Class B Common to which such piggyback registration
rights have attached will be collectively called the "Piggyback Rights
Holders") pursuant to which the Piggyback Rights Holders have the right to
request that the Company register their registrable Class A Common and Class B
Common whenever the Company registers any of its securities under the
Securities Act (other than pursuant to a demand registration) and the
registration form to be used may be used for the registration of the
registrable Class A Common or Class B Common; unless the piggyback
registration is in connection with an underwritten registration and the
managing underwriter is of the opinion that inclusion of all or any portion of
the shares of Class A Common or Class B Common with respect to which the
Piggyback Rights Holders request registration would have an adverse impact on
the marketing of the securities to be sold in such underwritten offering.
 
                                      59
<PAGE>
 
 Distributions
 
  Pursuant to the Company's Certificate of Incorporation, the holders of Class
A Common, Class B Common, and Class C Common have differing rights to
distributions made by the Company depending on the type of distribution
involved. The following table details the relative rights based on the type of
distribution:
 
<TABLE>
<CAPTION>
DISTRIBUTION
CLASS A, B, C
COMMON                 CLASS A COMMON                CLASS B COMMON                CLASS C COMMON
- -------------          --------------                --------------                --------------
<S>               <C>                       <C>                               <C>
1. Dividends      (i) Each share of Class A (ii) Each share of Class          (iii) No share of Class C
                      Common and                 A Common and                       Common has a
                      Class B Common             Class B Common                     right to receive
                      share equally in any       share equally in any               any
                      dividend declared          dividend declared                  portion of any
                      out of the earnings        out of the earnings                dividends out of
                      of the Company             of the Company                     earnings
2. Other Non-     (i) First, to the holders (ii) Second, to the               (iii)  The holders of
 Liquidating          of Class A                 holders of Class B                  Class C Common
 Distributions(1)     Common (ratably            Common (ratably                     shall have no
                      among such                 among such                          right
                      holders) until the         holders) in an                      (except such right
                      total Other                amount up to the                    as may result from
                      Non-Liquidating            product of the                      their holding
                      Distributions made         quotient obtained by                Class A
                      to each holder             dividing the                        Common or
                      (since November 27,        aggregate number                    Class B Common)
                      1996) is equal             of Class B Common                   to receive any
                      to the sum of the          outstanding by the                  portion of any
                      initial price paid to      aggregate number                    Other Non-
                      the Company for            of shares of Class A                Liquidating
                      such shares of             Common and                          Distributions
                      Class A                    Class B Common
                      Common plus the            outstanding times
                      aggregate                  the aggregate of all
                      contributions to the       Other
                      capital of the             Non-Liquidating
                      Company made               Distributions
                      with respect to such       previously made
                      Class A Common             pursuant to these
                      from November 27,          subsections 2(i) and
                      1996 up to and             2(ii) to the holders
                      including the date         of Class A
                      of such distribution       Common and Class B
                                                 Common from
                                                 November 27, 1996
</TABLE>
 
- --------
(1) All distributions other than dividends made out of earnings or
    distributions as part of a complete liquidation, dissolution, or winding
    up of the Company are defined as "Other Non-Liquidating Distributions."
 
                                      60
<PAGE>
 
<TABLE>
<CAPTION>
DISTRIBUTION
CLASS A, B, C
COMMON                  CLASS A COMMON           CLASS B COMMON           CLASS C COMMON
- -------------           --------------           --------------           --------------
<S>                <C>                      <C>                      <C>
             Thereafter, to the holders of Class A Common and
             Class B Common (ratably among such holders) based on
             the number of shares of Class A Common and Class B
             Common held by each such holder.
3. Liquidating     (i) First, to the                                 (ii) Second, to the
 Distributions(2)      holders                                            holders of Class C
                       of Class A                                         Common (ratably
                       Common (ratably                                    among such
                       among such                                         holders) in an
                       holders) until the                                 amount up to the
                       total Other Non-                                   product of the
                       Liquidating                                        quotient obtained
                       Distributions                                      by
                       and Liquidating                                    dividing the
                       Distributions made                                 aggregate
                       to                                                 number of Class C
                       each holder (since                                 Common out-
                       November 27,                                       standing by the
                       1996) is equal to                                  aggregate number
                       the sum of the                                     of shares of Class
                       initial price paid                                 B
                       to                                                 Common and Class C
                       the Company for                                    Common outstanding
                       such shares of Class                               times the aggregate
                       A                                                  of all Other Non-
                       Common plus the                                    Liquidating
                       aggregate                                          Distributions made
                       contributions                                      pursuant to
                       to the capital                                     subsections 2(i)
                       of the Company made                                and 2(ii) to the
                       with respect to such                               holders of Class B
                       Class A Common from                                Common from
                       November 27, 1996                                  November 27, 1996
                       up to and including
                       the date of such
                       distribution
             Third, to the holders of Class B Common and Class C
             Common (ratably among such holders)
             Thereafter, to the holders of all classes of Common
             Stock (ratably among such holders)
</TABLE>
 
- --------
(2) All distributions in any complete liquidation, dissolution, or winding up
    of the Company are defined as "Liquidating Distributions."
 
                                      61
<PAGE>
 
                       DESCRIPTION OF THE EXCHANGE NOTES
 
GENERAL
 
  The Senior Notes were, and the Exchange Notes will be, issued under the
Indenture between the Company and Harris Trust and Savings Bank, as trustee
under the Indenture. For purposes of this Description of the Exchange Notes
only, the term "Company" refers to Focal Communications Corporation and does
not include its subsidiaries except where specifically noted and for purposes
of financial data determined on a consolidated basis.
 
  The terms of the Exchange Notes will be identical in all material respects
to the Senior Notes, except that (i) the Exchange Notes will have been
registered under the Securities Act and therefore will not be subject to
certain restrictions on transfer applicable to the Senior Notes and (ii)
Holders of the Exchange Notes will not be entitled to certain rights of
Holders of Senior Notes under the Registration Agreement. The terms of the
Exchange Notes include those stated in the Indenture and those made a part of
the Indenture by reference to the Trust Indenture Act of 1939, as amended (the
"Trust Indenture Act"). The Exchange Notes will be subject to all such terms,
and Holders of the Exchange Notes are referred to the Indenture and the Trust
Indenture Act for a complete statement of such terms. A copy of the Indenture
is available from the Company on request. The statements and definitions of
terms under this caption relating to the Exchange Notes and the Indenture are
summaries and do not purport to be complete. Such summaries make use of
certain terms defined in the Indenture but not herein and are qualified in
their entirety by express reference to the Indenture. Certain capitalized
terms used herein and not otherwise defined below under "--Certain
Definitions" are defined in the Indenture.
 
PRINCIPAL, MATURITY AND INTEREST
 
  The Exchange Notes mature on February 15, 2008 (the "Stated Maturity"). The
Exchange Notes will be limited to an aggregate stated principal amount at
maturity of $270,000,000. The Senior Notes were issued at an issue price of
$555.6578 per $1,000 stated principal amount at maturity (the "Issue Price")
(55.56578% of the stated principal amount at maturity) to generate gross
proceeds to the Company of $150,027,606. The Exchange Notes are being issued
in substitution for the Senior Notes and are, therefore, deemed to have been
issued at the same discount. The Exchange Notes will bear interest on the
Issue Price at a rate of 12.125% per annum computed on a semiannual bond
equivalent basis from the Issue Date. In the period prior to February 15,
2003, interest at a rate of 12.125% per annum will accrue on the Issue Price
but will not be payable in cash ("Deferred Interest"). For United States
federal income tax purposes, a significant amount of original issue discount,
taxable as ordinary income, will be recognized by a holder of Exchange Notes
as such Deferred Interest accrues from the Issue Date. From February 15, 2003,
interest at a rate of 12.125% per annum ("Current Interest") on the stated
principal amount at maturity of the Exchange Notes will be payable in cash
semiannually on August 15 and February 15 of each year, beginning on August
15, 2003, to the Person in whose name the Exchange Note (or any predecessor
Exchange Note) is registered at the close of business on the preceding August
1, or February 1, as the case may be. The stated principal amount at maturity
is $1,000 per Exchange Note and represents the Issue Price plus Deferred
Interest accrued but unpaid up to February 15, 2003. Interest will be computed
on the basis of a 360-day year comprised of twelve 30-day months. The Company
shall pay interest on overdue principal and premium, if any, of the Exchange
Notes and, to the extent lawful, interest on overdue installments of interest
on the Exchange Notes at a rate per annum equal to the interest rate payable
on the Exchange Notes.
 
  The Exchange Notes will be issued without coupons and in fully registered
form only, in minimum denominations of $1,000 stated principal amount at
maturity and integral multiples thereof. The Exchange Notes will be issued
only against surrender of an equal stated principal amount at maturity of
Senior Notes.
 
  The interest rate on the Exchange Notes is subject to increase if certain
conditions are not satisfied, all as further described under "Description of
the Exchange Notes--Exchange Offer; Registration Rights." All references
herein to Current Interest and Deferred Interest include any such Additional
Interest.
 
                                      62
<PAGE>
 
RANKING
 
  The Exchange Notes will be senior unsecured obligations of the Company
ranking pari passu in right of payment with the Senior Notes and all other
existing and future senior Indebtedness of the Company, and will rank senior
in right of payment to all existing and future subordinated Indebtedness of
the Company, if any. Holders of secured Indebtedness of the Company, however,
will have claims that are prior to the claims of the Holders with respect to
the assets securing such other Indebtedness except to the extent the Notes are
equally and ratably secured by such assets. The Indenture will permit the
Company to incur secured Indebtedness. As of December 31, 1997, on a pro forma
basis after giving effect to the Offering and the application of the net
proceeds therefrom, the Company would have had no outstanding indebtedness
other than the Notes.
 
  The operations of the Company are conducted through its subsidiaries and,
therefore, the Company is dependent upon cash flow from such entities to meet
its obligations. The Company's subsidiaries will have no direct obligation to
pay amounts due on the Exchange Notes and will not guarantee the Exchange
Notes. As a result, the Exchange Notes will be effectively subordinated to all
existing and future Indebtedness and other liabilities of the Company's
subsidiaries (including trade payables). See "Risk Factors--Holding Company
Structure; Effective Subordination of the Exchange Notes." Except to the
extent that loans made by the Company to its subsidiaries are recognized as
Indebtedness, any rights of the Company and its creditors, including the
Holders, to participate in the assets of any of the Company's subsidiaries
upon any liquidation or reorganization of any such subsidiaries will be
subject to the prior claims of such subsidiary's creditors (including trade
creditors).
 
BOOK-ENTRY SYSTEM
 
  The Exchange Notes will initially be issued in the form of one or more
Global Notes (as defined in the Indenture) held in book-entry form. The
Exchange Notes will be deposited with the Trustee as custodian for DTC, and
DTC or its nominee will initially be the sole registered Holder of the
Exchange Notes for all purposes under the Indenture. Except as set forth
below, a Global Note may not be transferred except as a whole by DTC to a
nominee of DTC or by a nominee of DTC to DTC.
 
  The Exchange Notes that are issued as described below under "--Certificated
Notes" will be issued in definitive form.
 
  Upon the transfer of an Exchange Note in definitive form, such Exchange Note
will, unless the Global Note has previously been exchanged for Exchanges Notes
in definitive form, be exchanged for an interest in the Global Note
representing the principal amount of the Exchange Notes being transferred.
 
  Upon the issuance of a Global Note, DTC or its nominee will credit, on its
internal system, the accounts of persons holding through it with the
respective principal amount of Exchange Notes of the individual beneficial
interests represented by such Global Note. Ownership of beneficial interests
in a Global Note will be limited to persons that have accounts with DTC
("participants") or persons that may hold interests through participants.
Ownership of beneficial interests by participants in a Global Note will be
shown on, and the transfer of that ownership interest will be effected only
through, records maintained by DTC or its nominee for such Global Note.
Ownership of beneficial interests in such Global Note by persons that hold
through participants will be shown on, and the transfer of that ownership
interest within such participant will be effected only through, records
maintained by such participant. The laws of some jurisdictions require that
certain purchasers of securities take physical delivery of such securities in
definitive form. Such limits and such laws may impair the ability to transfer
beneficial interests in a Global Note.
 
  Payment of principal of, premium, if any, on and interest on Exchange Notes
represented by any such Global Note will be made to DTC or its nominee, as the
case may be, as the sole registered owner and the sole Holder of the Exchange
Notes represented thereby for all purposes under the Indenture. None of the
Company, the Trustee, or any agent of the Company will have any responsibility
or liability for (i) any aspect of DTC's reports relating to or payment made
on account of beneficial ownership interests in a Global Note representing
 
                                      63
<PAGE>
 
any Exchange Notes or for maintaining, supervising or reviewing any of DTC's
records relating to such beneficial ownership interests or (ii) any other
matter relating to the actions and practices of DTC or any of its
participants.
 
  The Company has been advised by DTC that upon receipt of any payment of
principal of, premium, if any, on or interest on any Global Note, DTC will
immediately credit, on its book-entry registration and transfer system, the
accounts of participants with payments in amounts proportionate to their
respective beneficial interests in the principal or face amount of such Global
Note, as shown on the records of DTC. The Company expects that payments by
participants to owners of beneficial interests in a Global Note held through
such participants will be governed by standing instructions and customary
practices as is now the case with securities held for customer accounts
registered in "street name" and will be the sole responsibility of such
participants.
 
  So long as DTC or its nominee is the registered owner or Holder of such
Global Note, DTC or such nominee, as the case may be, will be considered the
sole owner or Holder of the Exchange Notes represented by such Global Note for
the purposes of receiving payment on the Exchange Notes, receiving notices and
for all other purposes under the Indenture and the Exchange Notes. Beneficial
interests in Exchange Notes will be evidenced only by, and transfers thereof
will be effected only through, records maintained by DTC and its participants.
Except as provided above, owners of beneficial interests in a Global Note will
not be entitled to and will not be considered the Holders of such Global Note
for any purposes under the Indenture. Accordingly, each person owning a
beneficial interest in a Global Note must rely on the procedures of DTC and,
if such person is not a participant, on the procedures of the participant
through which such person owns its interest, to exercise any rights of a
Holder under the Indenture. The Company understands that, under existing
industry practices, in the event that the Company requests any action of
Holders or that an owner of a beneficial interest in a Global Note desires to
give or take any action that a Holder is entitled to give or take under the
Indenture, DTC would authorize the participants holding the relevant
beneficial interest to give or take such action, and such participants would
authorize beneficial owners owning through such participants to give or take
such action or would otherwise act upon the instructions of beneficial owners
owning through them.
 
  DTC has advised the Company that it will take any action permitted to be
taken by a Holder of Exchange Notes (including the presentation of Exchange
Notes for exchange as described below) only at the direction of one or more
participants to whose account with DTC interests in the Global Note are
credited and only in respect of such portion of the aggregate principal amount
of the Exchange Notes as to which such participant or participants has or have
given such direction.
 
  DTC has advised the Company that DTC is a limited-purpose trust company
organized under the Banking Law of the State of New York, a "banking
organization" within the meaning of New York Banking Law, a member of the
Federal Reserve System, a "clearing corporation" within the meaning of the New
York Uniform Commercial Code and a "clearing agency" registered under the
Exchange Act. DTC was created to hold the securities of its participants and
to facilitate the clearance and settlement of securities transactions among
its participants in such securities through electronic book-entry changes in
accounts of the participants, thereby eliminating the need for physical
movement of securities certificates. DTC's participants include securities
brokers and dealers, banks, trust companies, clearing corporations and certain
other organizations some of whom (and/or their representatives) own DTC.
Access to DTC's book-entry system is also available to others, such as banks,
brokers, dealers and trust companies that clear through or maintain a
custodial relationship with a participant, either directly or indirectly.
 
  The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Company believes to be reliable, but
the Company takes no responsibility for the accuracy thereof.
 
CERTIFICATED NOTES
 
  The Exchange Notes represented by a Global Note are exchangeable for
certificated Exchange Notes only if: (i) DTC notifies the Company that it is
unwilling or unable to continue as a depository for such Global Note
 
                                      64
<PAGE>
 
or if at any time DTC ceases to be a clearing agency registered under the
Exchange Act, and a successor depository is not appointed by the Company
within 90 days; (ii) the Company executes and delivers to the Trustee a notice
that such Global Note shall be so transferable, registrable and exchangeable,
and such transfer shall be registrable; or (iii) there shall have occurred and
be continuing an Event of Default with respect to the Notes represented by
such Global Note. Any Global Note that is exchangeable for certificated
Exchange Notes pursuant to the preceding sentence will be transferred to, and
registered and exchanged for, certificated Exchange Notes in authorized
denominations and registered in such names as DTC or its nominee holding such
Global Note may direct. Subject to the foregoing, a Global Note is not
exchangeable, except for a Global Note of like denomination to be registered
in the name of DTC or its nominee. In the event that a Global Note becomes
exchangeable for certificated Exchange Notes: (i) certificated Exchange Notes
will be issued only in fully registered form in denominations of $1,000 or
integral multiples thereof; (ii) payment of principal, any repurchase price,
and interest on the certificated Exchange Notes will be payable, and the
transfer of the certificated Exchange Notes will be registrable, at the office
or agency of the Company maintained for such purposes; and (iii) no service
charge will be made for any issuance of the certificated Exchange Notes,
although the Company may require payment of a sum sufficient to cover any tax
or governmental charge imposed in connection therewith.
 
OPTIONAL REDEMPTION
 
  The Exchange Notes will be redeemable, at the Company's option, in whole or
in part, at any time or from time to time, on or after February 15, 2003 and
prior to maturity, upon not less than 30 nor more than 60 days' prior notice
by first class mail to each Holder's last address as it appears in the
Register, at the redemption prices (expressed in percentages of stated
principal amount at maturity) set forth below, plus accrued and unpaid Current
Interest, if any, on the stated principal amount at maturity so redeemed to
the redemption date (subject to the right of Holders of record on the relevant
Record Date that is on or prior to the redemption date to receive Current
Interest, if any, due on an interest payment date), if redeemed during the 12-
month period commencing February 15, of the years set forth below:
 
<TABLE>
<CAPTION>
         YEAR                                                   REDEMPTION PRICE
         ----                                                   ----------------
      <S>                                                       <C>
      2003.....................................................     106.063%
      2004.....................................................     104.042
      2005.....................................................     102.021
      2006 and thereafter......................................     100.000
</TABLE>
 
  In addition, at any time and from time to time prior to February 15, 2001,
the Company may redeem in the aggregate up to 35% of the original aggregate
stated principal amount at maturity of the Exchange Notes with the proceeds
from one or more Public Equity Offerings following which there is a Public
Market at a redemption price (expressed as a percentage of Accreted Value on
the redemption date) of 112.125%, plus Additional Interest, if any; provided,
that at least 65% of the original aggregate stated principal amount at
maturity of the Notes remains outstanding after each such redemption.
 
  If less than all of the Notes are to be redeemed, the Trustee shall select,
in such manner as it shall deem fair and appropriate, the particular Notes to
be redeemed or any portion thereof in stated principal amounts at maturity of
$1,000 or integral multiples thereof.
 
MANDATORY REDEMPTION
 
  Except as set forth under "--Repurchase at the Option of Holders upon a
Change of Control" and "--Asset Sale," the Company is not required to make
redemption payments or sinking fund payments with respect to the Exchange
Notes.
 
REPURCHASE AT THE OPTION OF HOLDERS UPON A CHANGE OF CONTROL
 
  Upon the occurrence of a Change of Control, each Holder will have the right
to require the Company to repurchase all or any part (equal to $1,000 stated
principal amount at maturity or an integral multiple thereof) of
 
                                      65
<PAGE>
 
such Holder's Exchange Notes pursuant to the offer described below (the
"Change of Control Offer") at a purchase price (the "Change of Control
Purchase Price") equal to 101% of the Accreted Value thereof plus accrued and
unpaid Current Interest, if any, to but excluding any Change of Control
Payment Date (as defined below).
 
  Within 30 days following any Change of Control, the Company or the Trustee
(at the expense of the Company) shall mail a notice to each Holder stating:
(i) that a Change of Control Offer is being made pursuant to the covenant
described under "--Repurchase at the Option of Holders upon a Change of
Control" and that all Exchange Notes timely tendered will be accepted for
payment; (ii) the Change of Control Purchase Price and the purchase date (the
"Change of Control Payment Date"), which shall be no earlier than 30 days nor
later than 60 days from the date such notice is mailed; (iii) any Exchange
Notes or portions thereof not tendered or accepted for payment will continue
to accrue interest; (iv) that unless the Company defaults in the payment of
the Change of Control Purchase Price, all Exchange Notes or portions thereof
accepted for payment pursuant to the Change of Control Offer shall cease to
accrue interest from and after the Change of Control Payment Date; (v) Holders
electing to have any Exchange Notes or portions thereof purchased pursuant to
a Change of Control Offer will be required to surrender their Exchange Notes
to the Paying Agent at the address set forth in the notice prior to the close
of business on the third Business Day preceding the Change of Control Payment
Date; (vi) Holders will be entitled to withdraw their election if the Paying
Agent receives, not later than the close of business on the second Business
Day preceding the Change of Control Payment Date, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the stated
principal amount at maturity of Exchange Notes delivered for purchase, and a
statement that such Holder is withdrawing such Holder's election to have such
Exchange Notes or portions thereof purchased; (vii) Holders whose Exchange
Notes are being purchased only in part will be issued new Exchange Notes equal
in stated principal amount at maturity to the unpurchased portion of the
Exchange Note or Exchange Notes surrendered, which unpurchased portion must be
equal to $1,000 in stated principal amount at maturity or an integral multiple
thereof; and (viii) if after giving effect to such Change of Control Offer, at
least 95% of the original aggregate stated principal amount at maturity of the
Notes has been redeemed or repurchased, the Company shall have the right to
redeem the balance of the Notes at the Change of Control Redemption Purchase
Price.
 
  On the Change of Control Payment Date, the Company will: (i) accept for
payment Exchange Notes or portions thereof properly tendered pursuant to the
Change of Control Offer; (ii) irrevocably deposit with the Paying Agent in
immediately available funds an amount equal to the Change of Control Purchase
Price in respect of all Exchange Notes or portions thereof so tendered; and
(iii) deliver, or cause to be delivered, to the Trustee the Exchange Notes so
accepted together with an Officers' Certificate listing the Exchange Notes or
portions thereof tendered to the Company and accepted for payment. The Paying
Agent shall promptly mail to each Holder of Exchange Notes so accepted,
payment in an amount equal to the Change of Control Purchase Price for such
Exchange Notes, and the Company shall execute and the Trustee shall promptly
authenticate and mail to each Holder a new Note equal in stated principal
amount at maturity to any unpurchased portion of the Exchange Notes
surrendered, if any; provided that each such new Note shall be in a stated
principal amount at maturity of $1,000 or an integral multiple thereof.
 
  If after giving effect to a Change of Control Offer at least 95% of the
original aggregate stated principal amount at maturity of the Notes has been
repurchased, the Company shall have the right to redeem the balance of the
Notes at a redemption price (the "Change of Control Redemption Purchase
Price") equal to 101% of the Accreted Value thereof plus accrued and unpaid
Current Interest, if any, to but excluding the Change of Control Redemption
Date (as defined below) by giving the Holders notice of such redemption within
30 days following the Change of Control Payment Date with respect to such
Change of Control Offer (the "Change of Control Redemption"). Such notice
shall state that (i) a Change of Control Offer has been consummated and after
giving effect thereto at least 95% of the original aggregate stated principal
amount at maturity of the Notes has been redeemed or repurchased, (ii) the
Company is exercising its right to redeem the balance of the outstanding
Notes, (iii) the redemption date (the "Change of Control Redemption Date")
with respect to such Notes which shall be no earlier than 30 days nor later
than 60 days from the date such notice is mailed, (iv) unless the Company
 
                                      66
<PAGE>
 
defaults in the payment of the Change of Control Redemption Purchase Price
with respect to such Notes, all such Notes will cease to accrue interest from
and after such Change of Control Redemption Date and (v) Holders are required
to surrender their Notes to the Paying Agent at the address set forth in the
notice prior to the close of business on the third Business Day preceding such
Change of Control Redemption Date.
 
  On the Change of Control Redemption Date, the Company will: (i) accept for
payment Exchange Notes or portions thereof properly tendered pursuant to the
Change of Control Redemption; (ii) irrevocably deposit with the Paying Agent
in immediately available funds an amount equal to the applicable Change of
Control Redemption Purchase Price in respect of all Exchange Notes so
tendered; and (iii) deliver, or cause to be delivered, to the Trustee the
Exchange Notes so accepted together with an Officers' Certificate listing the
Exchange Notes tendered to the Paying Agent and accepted for payment. The
Paying Agent shall promptly mail to each Holder of Exchange Notes so accepted,
payment in an amount equal to the applicable Change of Control Redemption
Purchase Price for such Exchange Notes.
 
  The existence of the Holders' right to require, subject to certain
conditions, the Company to repurchase Exchange Notes upon a Change of Control
may deter a third party from acquiring the Company in a transaction that
constitutes a Change of Control. Future indebtedness of the Company may
contain provisions which prohibit the purchase by the Company of any Exchange
Notes prior to their stated maturity, require obligations thereunder to be
repurchased upon a Change of Control or limit or prohibit the Company's
ability to comply with its obligations under the Indenture in the event of a
Change of Control. Further, the failure of the Company to pay the Change of
Control Purchase Price would constitute an Event of Default which in turn
could cause an event of default under such other indebtedness of the Company.
Moreover, due to the financial effect of such repurchase on the Company, the
exercise by the Holders of their right to require the Company to repurchase
the Exchange Notes could cause a default under such other indebtedness, even
if the Change of Control itself does not. If a Change of Control Offer is
made, there can be no assurance that the Company will have sufficient funds to
pay the Change of Control Purchase Price for all Exchange Notes tendered by
Holders seeking to accept the Change of Control Offer. In the event that a
Change of Control Offer occurs at a time when the Company does not have
sufficient available funds to pay the Change of Control Purchase Price for all
Exchange Notes tendered pursuant to such offer or at a time when the Company
is prohibited from purchasing the Notes (and the Company is unable either to
obtain the consent of the holders of the relevant indebtedness or to repay
such indebtedness), an Event of Default would occur under the Indenture.
 
  One of the events that constitutes a Change of Control under the Indenture
is a sale, conveyance, transfer or lease of all or substantially all of the
Property of the Company. The Indenture will be governed by New York law, and
there is no established definition under New York law of "substantially all"
of the assets of a corporation. Accordingly, if the Company were to engage in
a transaction in which it disposed of less than all of its assets, a question
of interpretation could arise as to whether such disposition was of
"substantially all" of its assets and whether the Company was required to make
a Change of Control Offer.
 
  To the extent such laws and regulations are applicable, the Company will
comply with the requirements of Section 14(e) under the Exchange Act and any
other securities laws and regulations in connection with the repurchase of
Exchange Notes pursuant to a Change of Control Offer or a Change of Control
Redemption.
 
  Except as described herein with respect to a Change of Control, the
Indenture does not contain any other provisions that permit Holders to require
that the Company repurchase or redeem Exchange Notes in the event of a
takeover, recapitalization or similar restructuring.
 
ASSET SALE
 
  The Company will not, and will not permit any Restricted Subsidiary to,
directly or indirectly, consummate an Asset Sale unless (i) the Company or
such Restricted Subsidiary, as the case may be, receives consideration for
such Asset Sale at least equal to the Fair Market Value (as evidenced by a
Board Resolution delivered to the Trustee) of the Property or other assets
sold or otherwise disposed of, (ii) at least 75% of the consideration
 
                                      67
<PAGE>
 
received by the Company or such Restricted Subsidiary for such Property or
other assets consists of (a) cash, readily-marketable cash equivalents or
Telecommunications Assets, (b) the assumption of Indebtedness of the Company
or such Restricted Subsidiary (other than Indebtedness that is subordinated by
its terms to the Notes) and the release of the Company or the Restricted
Subsidiary, as the case may be, from all liability on the Indebtedness so
assumed or (c) publicly-traded shares of Capital Stock (other than Preferred
Stock and Disqualified Stock) traded in the United States of any Person
engaged in a Telecommunications Business and (iii) the Company or any
Restricted Subsidiary, as the case may be, uses the Net Cash Proceeds from
such Asset Sale in the manner set forth in the next paragraph.
 
  Within 360 days after any Asset Sale, the Company or any Restricted
Subsidiary, as the case may be, may at its option (i) reinvest an amount equal
to the Net Cash Proceeds (or any portion thereof) from such Asset Sale in
Telecommunications Assets or in Capital Stock of any Person engaged in the
Telecommunications Business and/or (ii) apply an amount equal to such Net Cash
Proceeds (or remaining Net Cash Proceeds) (a) to the permanent reduction of
senior secured Indebtedness of the Company (other than Indebtedness to a
Restricted Subsidiary unless the proceeds thereof are used by such Restricted
Subsidiary in a manner contemplated by (i) through (iii) of this sentence) or
other Indebtedness of the Company (other than Indebtedness to a Restricted
Subsidiary unless the proceeds thereof are used by such Restricted Subsidiary
in a manner contemplated by (i) through (iii) of this sentence) that is senior
to the Notes or to the permanent reduction of Indebtedness, or to the
redemption of Preferred Stock, of any Restricted Subsidiary (other than
Indebtedness to, or Preferred Stock owned by, the Company or another
Restricted Subsidiary unless the proceeds thereof are used by the Company or
such Restricted Subsidiary in a manner contemplated by (i) through (iii) of
this sentence) or (b) to the extent none of the Company or any of its
Restricted Subsidiaries has any Indebtedness outstanding of the type referred
to in the immediately preceding clause (a) (other than Indebtedness under
senior secured revolving credit facilities), to the repayment of outstanding
Indebtedness under any such revolving credit facility; provided, however, that
neither the Company nor any Restricted Subsidiary shall be required to
permanently reduce the commitments under any such revolving credit facility by
an amount equal to the outstanding Indebtedness thereunder so repaid or
prepaid and/or (iii) apply an amount equal to such Net Cash Proceeds (or
remaining Net Cash Proceeds) to prepay, whether in whole or in part,
Indebtedness that is pari passu with the Notes and that matures prior to
February 15, 2008. Any Net Cash Proceeds from any Asset Sale that are not used
within 360 days as described in (i) through (iii) above shall constitute
"Excess Proceeds."
 
  If at any time the aggregate amount of Excess Proceeds calculated as of any
date exceeds $5 million, the Company shall, within 30 days of such date, make
an offer to purchase (an "Asset Sale Offer"), on a pro rata basis, (i) Notes
at a purchase price (the "Offer Purchase Price") in cash equal to 100% of the
Accreted Value thereof, plus accrued and unpaid Current Interest thereon, if
any, to but excluding the purchase date, in accordance with the procedures set
forth in the Indenture and (ii) to the extent required by the terms thereof,
any other Indebtedness of the Company that is pari passu with the Notes. The
pro rata amount of such Excess Proceeds to be used to purchase Notes shall be
in an amount equal to the aggregate amount of such Excess Proceeds multiplied
by the quotient obtained by dividing the Accreted Value of the outstanding
Notes by the sum of such Accreted Value and the principal amount of such other
Indebtedness. To the extent that the aggregate Offer Purchase Price of all
Notes tendered pursuant to an Asset Sale Offer is less than the Excess
Proceeds relating thereto (such shortfall constituting a "Deficiency"), the
Company may use such Deficiency for general corporate purposes and such
Deficiency shall not thereafter constitute Excess Proceeds for any purpose. In
the event the aggregate Accreted Value of the outstanding Notes tendered
pursuant to an Asset Sale Offer is in excess of the Excess Proceeds to be used
to purchase such Notes, such Excess Proceeds shall be applied to purchase such
Notes on a pro rata basis in stated principal amounts at maturity of $1,000 or
integral multiples thereof. Any amount remaining after giving effect to such
purchase shall constitute a Deficiency and shall be applied as provided in the
immediately preceding sentence. Upon the completion of the purchase of all
Notes tendered pursuant to an Asset Sale Offer, the amount of Excess Proceeds
shall be reset to zero.
 
  To the extent such laws and regulations are applicable, the Company will
comply with the requirements of Section 14(e) under the Exchange Act and any
securities laws and regulations, in connection with the repurchase of Notes
pursuant to an Asset Sale Offer.
 
                                      68
<PAGE>
 
CERTAIN COVENANTS
 
  Set forth below are certain covenants that are contained in the Indenture:
 
 Limitation on Consolidated Indebtedness
 
  The Company will not, and will not permit any Restricted Subsidiary to,
directly or indirectly, Incur any Indebtedness after the Issue Date; provided
that the Company may Incur Indebtedness if, after giving effect to the
Incurrence of such Indebtedness and the receipt and application of the net
proceeds therefrom, the ratio of (a) the aggregate consolidated principal
amount of Indebtedness of the Company (including, in the case of the Notes,
only the Accreted Value thereof) outstanding as of the most recent available
quarterly or annual balance sheet, after giving pro forma effect to the
Incurrence of such Indebtedness and any other Indebtedness Incurred since such
balance sheet date and the receipt and application of the proceeds thereof, to
(b) Consolidated Cash Flow Available for Fixed Charges for the four full
fiscal quarters immediately preceding the Incurrence of such Indebtedness for
which consolidated financial statements of the Company are available,
determined on a pro forma basis as if any such Indebtedness had been Incurred
and the proceeds thereof had been applied at the beginning of such four fiscal
quarters, would be less than 6.0 to 1.0 for such four-quarter period.
 
  Notwithstanding the foregoing limitation, the Company and its Restricted
Subsidiaries may Incur the following Indebtedness:
 
    (i) Senior Indebtedness in an aggregate principal amount outstanding at
  any one time not to exceed $100,000,000, and any renewal, extension,
  refinancing or refunding thereof in an amount which, together with any
  principal amount remaining outstanding or available pursuant to this clause
  (i) does not exceed the aggregate principal amount outstanding or available
  under all such Senior Indebtedness immediately prior to such renewal,
  extension, refinancing or refunding, less, in any case, any amount of such
  Indebtedness permanently repaid under the covenant described above under
  "--Asset Sale";
 
    (ii) Indebtedness (including Guarantees) Incurred to finance the cost
  (including the cost of design, development, acquisition, construction,
  installation, improvement, transportation or integration) to acquire
  equipment, inventory or network assets (including acquisitions by way of
  any Capital Lease Obligation and acquisitions of the Capital Stock of a
  Person that becomes a Restricted Subsidiary to the extent of the Fair
  Market Value of the equipment, inventory or network assets so acquired) by
  the Company or a Restricted Subsidiary after the Issue Date;
 
    (iii) Indebtedness owed by the Company to any Significant Restricted
  Subsidiary or Indebtedness owed by a Restricted Subsidiary to the Company
  or to a Significant Restricted Subsidiary; provided that upon either (a)
  the transfer or other disposition by a Significant Restricted Subsidiary or
  the Company of any Indebtedness so permitted to a Person other than the
  Company or a Significant Restricted Subsidiary or (b) the issuance (other
  than directors' qualifying shares), sale, transfer or other disposition of
  shares of Capital Stock (including by amalgamation, consolidation or
  merger) of a Significant Restricted Subsidiary (such that upon such sale,
  transfer or other disposition such Restricted Subsidiary would no longer
  meet the definition of a Significant Restricted Subsidiary) to a Person
  other than the Company or a Significant Restricted Subsidiary, the
  provisions of this clause (iii) shall no longer be applicable to such
  Indebtedness and such Indebtedness shall be deemed to have been Incurred at
  the time of such transfer or other disposition;
 
    (iv) Indebtedness Incurred to renew, extend, refinance or refund
  (including successive extensions, renewals, refinancings and refundings),
  whether in whole or in part (each, a "refinancing") (a) the Notes, (b)
  Indebtedness outstanding at the date of the Indenture, (c) Indebtedness
  Incurred pursuant to clause (ii) of this paragraph or (d) Indebtedness
  Incurred pursuant to the first paragraph under the caption "--Limitation on
  Consolidated Indebtedness," in an aggregate principal amount not to exceed
  the aggregate principal amount of the Indebtedness so refinanced plus the
  amount of any premium required to be paid in connection with such
  refinancing pursuant to the terms of the Indebtedness so refinanced or the
  amount of any premium reasonably determined by the Company as necessary to
  accomplish such refinancing by means of a tender offer or privately
  negotiated repurchase, plus the expenses of the Company
 
                                      69
<PAGE>
 
  and its Restricted Subsidiaries incurred in connection with such
  refinancing; provided that Indebtedness the proceeds of which are used to
  refinance the Notes or Indebtedness which is pari passu with the Notes or
  Indebtedness which is subordinate in right of payment to the Notes shall
  only be permitted under this clause (iv) if (y) in the case of any
  refinancing of the Notes or Indebtedness which is pari passu with the
  Notes, the refinancing Indebtedness is made pari passu to the Notes or
  constitutes Subordinated Indebtedness, and, in the case of any refinancing
  of Subordinated Indebtedness, the refinancing Indebtedness constitutes
  Subordinated Indebtedness and (z) in any case, the refinancing Indebtedness
  by its terms, or by the terms of any agreement or instrument pursuant to
  which such Indebtedness is issued, (1) does not provide for payments of
  principal of such Indebtedness at stated maturity or by way of a sinking
  fund applicable thereto or by way of any mandatory redemption, defeasance,
  retirement or repurchase thereof by the Company (including any redemption,
  retirement or repurchase which is contingent upon events or circumstances,
  but excluding any retirement required by virtue of the acceleration of any
  payment with respect to such Indebtedness upon any event of default
  thereunder), in each case prior to the time the same are required by the
  terms of the Indebtedness being refinanced and (2) does not permit
  redemption or other retirement (including pursuant to an offer to purchase
  made by the Company) of such Indebtedness at the option of the holder
  thereof prior to the time the same are required by the terms of the
  Indebtedness being refinanced, other than a redemption or other retirement
  at the option of the holder of such Indebtedness (including pursuant to an
  offer to purchase made by the Company) which is conditioned upon a change
  of control pursuant to provisions substantially similar to those described
  under "--Repurchase at the Option of Holders upon a Change of Control";
 
    (v) Indebtedness (a) in respect of performance, surety or appeal bonds
  provided in the ordinary course of business, (b) in respect of guarantees
  or letters of credit Incurred in the ordinary course of business or (c)
  arising from customary agreements providing for indemnification, adjustment
  of purchase price or similar obligations, or from guarantees or letters of
  credit, surety bonds or performance bonds securing any obligations of the
  Company or any of its Restricted Subsidiaries pursuant to such agreements,
  in the case of this clause (c) Incurred in connection with the disposition
  of any business, assets or Restricted Subsidiary (other than Guarantees of
  Indebtedness Incurred by any Person acquiring all or any portion of such
  business, assets or Restricted Subsidiary for the purpose of financing such
  acquisition);
 
    (vi) Indebtedness outstanding under the Notes and the Indenture;
 
    (vii) Subordinated Indebtedness in an aggregate principal amount
  outstanding at any one time not to exceed $100,000,000, less, in any case,
  any amount of such Indebtedness permanently repaid as provided under the
  covenant described above under "--Asset Sale";
 
    (viii) Indebtedness of the Company not to exceed, at any one time
  outstanding, two times (a) the Net Cash Proceeds received by the Company
  after the Issue Date as a capital contribution or from the issuance and
  sale of its Capital Stock (other than Disqualified Stock) to a Person that
  is not a Subsidiary of the Company, to the extent (x) such capital
  contribution or Net Cash Proceeds have not been used pursuant to clause
  (iii)(c) of the first paragraph, or clause (ii) or (vi) of the second
  paragraph, of the "--Limitation on Restricted Payments" covenant described
  below to make a Restricted Payment and (y) if such capital contribution or
  Net Cash Proceeds are used to consummate a transaction pursuant to which
  the Company Incurs Acquired Indebtedness, the amount of such Net Cash
  Proceed exceeds one-half of the amount of Acquired Indebtedness so Incurred
  and (b) 80% of the fair market value of property (other than cash and cash
  equivalents) received by the Company after the Issue Date from the sale of
  its Capital Stock (other than Disqualified Stock) to a Person that is not a
  Subsidiary of the Company, to the extent (x) such capital contribution or
  Net Cash Proceeds have not been used pursuant to clause (iii)(c) of the
  first paragraph, or clause (ii) or (vi) of the second paragraph, of the "--
  Limitation on Restricted Payments" covenant described below to make a
  Restricted Payment and (y) if such capital contribution or Capital Stock is
  used to consummate a transaction pursuant to which the Company Incurs
  Acquired Indebtedness, 80% of the fair market value of the property
  received exceeds one-half of the amount of Acquired Indebtedness so
  Incurred provided, in the case of each of clause (a) and (b), that any such
  Indebtedness Incurred pursuant to this clause (viii) does not mature prior
  to the Stated Maturity of the Notes and has an Average Life longer than the
  Notes;
 
                                      70
<PAGE>
 
    (ix) Acquired Indebtedness;
 
    (x) Indebtedness of the Company to the extent the net proceeds thereof
  are promptly (a) used to repurchase Notes tendered as a result of a Change
  of Control Offer or (b) deposited to defease the Notes as provided under
  the covenant described below under "--Satisfaction and Discharge of the
  Indenture, Defeasance"; and
 
    (xi) Indebtedness not otherwise permitted to be Incurred pursuant to
  clauses (i) through (x) above, which, together with any other outstanding
  Indebtedness Incurred pursuant to this clause (xi), will not exceed
  $5,000,000 aggregate principal amount at any one time outstanding.
 
  For purposes of determining any particular amount of Indebtedness under this
"--Limitation on Consolidated Indebtedness" covenant, (i) Guarantees, Liens or
obligations with respect to letters of credit supporting Indebtedness
otherwise included in the determination of such particular amount shall not be
included and (ii) any Liens granted pursuant to the equal and ratable
provisions referred to in the "--Limitation on Liens" covenant described below
shall not be treated as Indebtedness. For purposes of determining compliance
with this "--Limitation on Consolidated Indebtedness" covenant, in the event
that an item of Indebtedness meets the criteria of more than one of the types
of Indebtedness described in the above clauses, the Company, in its sole
discretion, shall classify such item of Indebtedness and only be required to
include the amount and type of such Indebtedness in one of such clauses;
provided, however, that the Company may allocate portions of such Indebtedness
between or among such clauses.
 
 Limitation on Restricted Payments
 
  The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, make any Restricted Payment unless, at the time of
and after giving effect to such proposed Restricted Payment (i) no Default or
Event of Default shall have occurred and be continuing or shall occur as a
consequence thereof, (ii) after giving effect, on a pro forma basis, to such
Restricted Payment and the incurrence of any Indebtedness the net proceeds of
which are used to finance such Restricted Payment, the Company could incur at
least $1.00 of additional Indebtedness pursuant to the first paragraph of "--
Limitation on Consolidated Indebtedness" and (iii) after giving effect to such
Restricted Payment on a pro forma basis, the aggregate amount expended (the
amount so expended, if other than cash, to be determined in good faith by a
majority of the disinterested members of the Board of Directors, whose
determination shall be conclusive and evidenced by a Board Resolution) or
declared for all Restricted Payments after the Issue Date does not exceed the
sum of (a) 50% of the Consolidated Net Income of the Company (or, if
Consolidated Net Income shall be a deficit, minus 100% of such deficit) for
the period (taken as one accounting period) beginning on the last day of the
fiscal quarter immediately preceding the Issue Date and ending on the last day
of the fiscal quarter for which the Company's financial statements are
available immediately preceding the date of such Restricted Payment, plus (b)
100% of the net reduction in Investments, subsequent to the Issue Date, in any
Person, resulting from payments of interest on Indebtedness, dividends,
repayments of loans or advances, or other transfers of Property (but only to
the extent such interest, dividends, repayments or other transfers of Property
are not included in the calculation of Consolidated Net Income), in each case
to the Company or any Restricted Subsidiary from any Person (including,
without limitation, from Unrestricted Subsidiaries) or from redesignations of
Unrestricted Subsidiaries as Restricted Subsidiaries (valued in each case as
provided in the definition of "Investment"), not to exceed in the case of any
Person the amount of Investments previously made subsequent to the Issue Date
by the Company or any Restricted Subsidiary in such Person and which was
treated as a Restricted Payment; plus (c) the aggregate Net Cash Proceeds
received after the Issue Date (x) as capital contributions to the Company, (y)
from the issuance (other than to a Subsidiary of the Company) of Capital Stock
(other than Disqualified Stock) of the Company and warrants, rights or options
on Capital Stock (other than Disqualified Stock) of the Company, or (z) from
the conversion of Indebtedness of the Company into Capital Stock (other than
Disqualified Stock and other than by a Subsidiary of the Company) of the
Company after the date of the Indenture, except, in the case of this clause
(c), to the extent such Net Cash Proceeds are used to Incur Indebtedness
pursuant to clause (viii) under the covenant described above under "--
Limitation on Consolidated Indebtedness" or to make Restricted Payments
pursuant to clauses (ii) or (vi) of the second paragraph of this "Limitation
on Restricted Payments" covenant.
 
                                      71
<PAGE>
 
  The foregoing limitations shall not prevent the Company from (i) paying a
dividend on its Capital Stock at any time within 60 days after the declaration
thereof if, on the declaration date, the Company could have paid such dividend
in compliance with the preceding paragraph, (ii) retiring (a) any Capital
Stock of the Company or (b) any Indebtedness of the Company that is
subordinate in right of payment to the Notes, in exchange for, or out of the
proceeds of the substantially concurrent sale of Qualified Stock of the
Company, (iii) retiring any Indebtedness of the Company subordinated in right
of payment to the Notes in exchange for, or out of the proceeds of, the
substantially concurrent incurrence of Indebtedness of the Company (other than
Indebtedness to a Subsidiary of the Company), provided that such new
Indebtedness (a) is subordinated in right of payment to the Notes at least to
the same extent as the Indebtedness being refinanced, (b) has an Average Life
longer than the Notes, and (c) has no scheduled principal payments due in any
amount earlier than the equivalent amount of principal under the Indebtedness
so retired, (iv) retiring any Capital Stock or options to acquire Capital
Stock of the Company held by any directors, officers or employees of the
Company or any Restricted Subsidiary upon the termination of such Person's
tenure as a director or employee, as the case may be; provided that the
aggregate price paid for all such retired Capital Stock or options shall not
exceed $5,000,000 in the aggregate, (v) retiring any Capital Stock of the
Company to the extent necessary (as determined in good faith by a majority of
the disinterested members of the Board of Directors, whose determination shall
be conclusive and evidenced by a Board Resolution) to prevent the loss, or to
secure the renewal or reinstatement, of any license or franchise held by the
Company or any Restricted Subsidiary from any governmental agency, (vi)
Investments in any Person the primary business of which is related, ancillary
or complimentary to the business of the Company and its Restricted
Subsidiaries on the date of such Investments; provided that the aggregate
amount of Investments made pursuant to this clause (vi) does not exceed the
sum of (a) $20,000,000 and (b) the amount of Net Cash Proceeds received by the
Company after the Issue Date as a capital contribution or from the sale of its
Capital Stock (other than Disqualified Stock) to a Person who is not a
Subsidiary of the Company, except to the extent such Net Cash Proceeds are
used to Incur Indebtedness pursuant to clause (viii) under the covenant
described above under
"--Limitation on Consolidated Indebtedness" or to make Restricted Payments
pursuant to clause (iii)(c) of the first paragraph, or clause (ii) or this
clause (vi) of this paragraph, of this "Limitation on Restricted Payments"
covenant, plus (c) the net reduction in Investments made pursuant to this
clause (vi) resulting from distributions on or repayments of such Investments
or from the Net Cash Proceeds from the sale of any such Investment (except in
each case to the extent any such payment or proceeds are included in the
calculation of Consolidated Net Income) or from such Person becoming a
Restricted Subsidiary (valued in each case as provided in the definition of
"Investment"), provided that the net reduction in any Investment shall not
exceed the amount of such Investment, (vii) the declaration or payment of
dividends on the Common Stock of the Company (so long as such dividends are
paid to the holders of all classes of Common Stock) following a Public Equity
Offering of such Common Stock of up to 6% per annum of the Net Cash Proceeds
received by the Company in such Public Equity Offering, (viii) payments or
distributions to dissenting stockholders pursuant to applicable law to the
extent required in connection with a consolidation, merger or transfer of
assets that complies with the provisions of the Indenture applicable to
mergers, consolidations and transfers of all or substantially all of the
property and assets of the Company and (ix) making Investments not otherwise
permitted in an aggregate amount not to exceed $2,000,000 at any one time
outstanding.
 
  In determining the amount of Restricted Payments permissible under this
covenant, amounts expended pursuant to clauses (ii) and (iii) of the foregoing
paragraph shall not be included as Restricted Payments.
 
  Not later than the date of making any Restricted Payment (including any
Restricted Payment permitted to be made pursuant to the two previous
paragraphs), the Company shall deliver to the Trustee an Officers' Certificate
stating that such Restricted Payment is permitted and setting forth the basis
upon which the required calculations were computed, which calculations may be
based upon the Company's latest available financial statements.
 
 Limitation on Liens
 
  The Company may not, and may not permit any Restricted Subsidiary to,
directly or indirectly, Incur or suffer to exist any Lien on or with respect
to any Property or other assets or interests therein now owned or
 
                                      72
<PAGE>
 
hereafter acquired or any income or profits therefrom or any interest thereon
to secure any Indebtedness without making, or causing such Restricted
Subsidiary to make, effective provision for securing the Notes equally and
ratably with such Indebtedness, provided that no Indebtedness of the Company
which is subordinate in right of payment to the Notes may be so secured.
 
  The foregoing restrictions shall not apply to: (i) Liens existing on the
date of the Indenture and securing Indebtedness outstanding on the date of the
Indenture, (ii) Liens Incurred on or after the Issue Date pursuant to clause
(i) of the second paragraph under the covenant "--Limitation on Consolidated
Indebtedness", (iii) Liens in favor of the Company or any Significant
Restricted Subsidiary, (iv) Liens on Property of the Company or a Restricted
Subsidiary acquired, constructed or constituting improvements made after the
Issue Date to secure Indebtedness incurred pursuant to clause (ii) of the
second paragraph under "--Limitation on Consolidated Indebtedness" which is
otherwise permitted under the Indenture, provided that (a) the principal
amount of any Indebtedness secured by any such Lien does not exceed 100% of
such purchase price or cost of construction or improvement of the Property
subject to such Lien, (b) such Lien attaches to such Property prior to, at the
time of, or within 180 days after the engineering, acquisition, installation,
development, improvement, completion of construction or commencement of
operation of such Property and (c) such Lien does not extend to or cover any
Property other than the specific item of Property (or portion thereof)
acquired, engineered, constructed, installed, developed or constituting the
improvements made with the proceeds of such Indebtedness, (v) Liens to secure
Acquired Indebtedness, provided that (a) such Lien attaches to the acquired
asset prior to the time of the acquisition of such asset and (b) such Lien
does not extend to or cover any other Property, (vi) Liens to secure
Indebtedness Incurred to extend, renew, refinance or refund (or successive
extensions, renewals, refinancings or refundings), in whole or in part,
Indebtedness secured by any Lien referred to in the foregoing clauses (i),
(ii), (iv) and (v) so long as such Lien does not extend to any other Property
and the principal amount of Indebtedness so secured is not increased except as
otherwise permitted under clause (iv) of the second paragraph of
"--Limitation on Consolidated Indebtedness," (vii) Liens not otherwise
permitted by the foregoing clauses (i) through (vi) in an aggregate amount not
to exceed 5% of the Company's Consolidated Tangible Assets as of the date on
which any such Lien arises, (viii) Liens granted after the Issue Date pursuant
to the immediately preceding paragraph to secure the Notes and (ix) Permitted
Liens.
 
 Limitation on Sale and Leaseback Transactions
 
  The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, enter into, assume, Guarantee or otherwise become
liable with respect to any Sale and Leaseback Transaction (other than a Sale
and Leaseback Transaction between the Company or a Restricted Subsidiary on
the one hand and a Restricted Subsidiary or the Company on the other hand),
unless (i) the Company or such Restricted Subsidiary, as the case may be,
receives consideration at the time of such Sale and Leaseback Transaction at
least equal to the Fair Market Value (as evidenced by a Board Resolution) of
the Property subject to such transaction, (ii) the Attributable Indebtedness
of the Company or such Restricted Subsidiary with respect thereto is included
as Indebtedness and would be permitted under the covenant described under "--
Limitation on Consolidated Indebtedness," (iii) the Company or such Restricted
Subsidiary would be permitted to create a Lien on such Property without
securing the Notes by the covenant described under "--Limitation on Liens" and
(iv) the Net Cash Proceeds from such transaction are applied in accordance
with the covenant described under "--Asset Sale."
 
 Limitation on Dividends and Other Payment Restrictions Affecting Restricted
Subsidiaries
 
  The Company will not, and will not permit any Restricted Subsidiary to,
directly or indirectly, cause or suffer to exist or become effective, or enter
into, any encumbrance or restriction (other than pursuant to law or
regulation) on the ability of any Restricted Subsidiary (i) to pay dividends
or make any other distributions in respect of its Capital Stock or pay any
Indebtedness or other obligation owed to the Company or any Restricted
Subsidiary, (ii) to make loans or advances to the Company or any Restricted
Subsidiary or (iii) to transfer any of its Property to the Company or any
other Restricted Subsidiary, except: (a) any encumbrance or restriction
existing as of the Issue Date, (b) any encumbrance or restriction pursuant to
an agreement relating to an
 
                                      73
<PAGE>
 
acquisition of Property, so long as the encumbrances or restrictions in any
such agreement relate solely to the Property so acquired, (c) any encumbrance
or restriction relating to any Indebtedness of any Restricted Subsidiary
existing on the date on which such Restricted Subsidiary is acquired by the
Company or another Restricted Subsidiary (other than any such Indebtedness
Incurred by such Restricted Subsidiary in connection with or in anticipation
of such acquisition), (d) any encumbrance or restriction pursuant to an
agreement effecting a permitted refinancing of Indebtedness issued pursuant to
an agreement referred to in the foregoing clauses (a) through (c), so long as
the encumbrances and restrictions contained in any such refinancing agreement
are not materially more restrictive than the encumbrances and restrictions
contained in such agreements, (e) in the case of clause (iii) above only,
customary provisions (x) that restrict the subletting, assignment or transfer
of any Property or other asset that is a lease, license, conveyance or
contract or similar Property or other asset, (y) existing by virtue of any
transfer of, agreement to transfer, option or right with respect to, or Lien
on, any Property or other assets of the Company or any Restricted Subsidiary
not otherwise prohibited by the Indenture or (z) arising or agreed to in the
ordinary course of business, not relating to any Indebtedness, and that do
not, individually or in the aggregate, detract from the value of Property or
other assets of the Company or any Restricted Subsidiary in any manner
material to the Company or any Restricted Subsidiary, (f) in the case of
clause (iii) above only, restrictions contained in any security agreement
(including a Capital Lease Obligation) securing Indebtedness of the Company or
a Restricted Subsidiary otherwise permitted under the Indenture, but only to
the extent such restrictions restrict the transfer of the Property subject to
such security agreement, (g) any encumbrance or restriction pursuant to Senior
Indebtedness which is permitted to be outstanding under clause (i) of the
second paragraph of "--Limitation on Consolidated Indebtedness," (h) in the
case of clause (iii) only, any encumbrance or restriction pursuant to an
agreement for Indebtedness that is permitted to be outstanding under clause
(ii) of the second paragraph of "--Limitation on Consolidated Indebtedness,"
and (i) any restriction with respect to a Restricted Subsidiary imposed
pursuant to an agreement which has been entered into for the sale or
disposition of all or substantially all of the Capital Stock or assets of such
Restricted Subsidiary, provided that the consummation of such transaction
would not result in a Default, that such restriction terminates if such
transaction is not consummated and that the consummation or abandonment of
such transaction occurs within one year of the date such agreement was entered
into.
 
  The foregoing limitations shall not prevent the Company or any Restricted
Subsidiary from (i) creating, incurring, assuming or suffering to exist any
Liens otherwise permitted under the "--Limitation on Liens" covenant or (ii)
restricting the sale or other disposition of Property or other assets of the
Company or any of its Restricted Subsidiaries that secure Indebtedness of the
Company or any of its Restricted Subsidiaries otherwise permitted under "--
Limitation on Consolidated Indebtedness."
 
 Limitation on Issuance and Sale of Capital Stock of Restricted Subsidiaries
 
  The Company will not sell, and will not permit any Restricted Subsidiary,
directly or indirectly, to issue or sell, any shares of Capital Stock of a
Restricted Subsidiary (including options, warrants or other rights to purchase
shares of such Capital Stock) except (i) to the Company or a Wholly Owned
Restricted Subsidiary; (ii) issuances of directors' qualifying shares or sales
to foreign nationals of shares of Capital Stock of foreign Restricted
Subsidiaries, to the extent required by applicable law; (iii) if, immediately
after giving effect to such issuance or sale, such Restricted Subsidiary would
no longer constitute a Restricted Subsidiary and any Investment in such Person
remaining after giving effect to such issuance or sale would have been
permitted to be made under the covenant described above under "--Limitation on
Restricted Payments" if made on the date of such issuance or sale; or (iv)
issuances or sales of Common Stock (other than Disqualified Stock) of a
Restricted Subsidiary, provided that the Company or such Restricted Subsidiary
applies the Net Cash Proceeds, if any, of any such sale in accordance with the
covenant described above under "--Asset Sale."
 
 Transactions with Affiliates
 
  The Company will not, and will not permit any of its Restricted Subsidiaries
to, directly or indirectly, sell, lease, transfer, or otherwise dispose of,
any of its Properties or assets to, or purchase any Property or other assets
from, or enter into any contract, agreement, understanding, loan, advance or
Guarantee with, or for the benefit of, any Affiliate (each of the foregoing,
an "Affiliate Transaction"), unless (i) such Affiliate Transaction or series
 
                                      74
<PAGE>
 
of related Affiliate Transactions is on terms that are no less favorable to
the Company or such Restricted Subsidiary than those that could have been
obtained in a comparable arm's-length transaction by the Company or such
Restricted Subsidiary with a Person that is not an Affiliate (or, in the event
that there are no comparable transactions involving Persons who are not
Affiliates of the Company or the relevant Restricted Subsidiary to apply for
comparative purposes, is otherwise on terms that, taken as a whole, the
Company has determined to be fair to the Company or the relevant Restricted
Subsidiary) and (ii) the Company delivers to the Trustee (a) with respect to
any Affiliate Transaction involving aggregate payments or, in the case of
assets or Property, a Fair Market Value in excess of $1,000,000, a certificate
of the chief executive, operating or financial officer of the Company
evidencing such officer's determination that such Affiliate Transaction or
series of related Affiliate Transactions complies with clause (i) above and is
in the best interests of the Company or such Restricted Subsidiary, (b) with
respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate payments or, in the case of assets or
Property, a Fair Market Value in excess of $5,000,000, a Board Resolution
certifying that such Affiliate Transaction or series of related Affiliate
Transactions complies with clause (i) above and that such Affiliate
Transaction or series of related Affiliate Transactions has been approved by a
majority of the disinterested members of the Board of Directors who have
determined that such Affiliate Transaction or series of related Affiliate
Transactions is in the best interest of the Company or such Restricted
Subsidiary and (c) with respect to any Affiliate Transaction or series of
related Affiliate Transactions involving aggregate payments or, in the case of
any assets or Property, a Fair Market Value in excess of $10,000,000, a
written opinion stating that the transaction complies with clause (i) above
from a financial point of view from an investment banking firm of national
standing in the United States which, in the good faith judgment of the Board
of Directors, is independent with respect to the Company and its Subsidiaries
and qualified to perform such task; provided that the following shall not be
deemed Affiliate Transactions: (1) any employment, noncompetition,
confidentiality or similar agreement entered into by the Company or any of its
Restricted Subsidiaries in the ordinary course of business, (2) any agreement
or arrangement with respect to the compensation of a director or officer of
the Company or any Restricted Subsidiary approved by a majority of the
disinterested members of the Board of Directors, (3) transactions permitted by
the covenant described under "--Limitation on Restricted Payments," (4)
transactions pursuant to any agreement or arrangement existing on the Issue
Date, including any renewal, replacement, extension, amendment or other
modification thereof, provided such modifications are not materially more
adverse to the Company or the Restricted Subsidiaries, (5) issuances of
Capital Stock of the Company to any Affiliates and (6) the sale of
telecommunications services to any Affiliate on an arm's length basis which is
undertaken in the ordinary course of the Company's business.
 
 Restricted and Unrestricted Subsidiaries
 
    (i) The Company may designate a Subsidiary (including a newly formed or
  newly acquired Subsidiary) of the Company or any of its Restricted
  Subsidiaries as an Unrestricted Subsidiary if such Subsidiary does not have
  any obligations which, if in default, would result in a cross default on
  Indebtedness of the Company or a Restricted Subsidiary (other than
  Indebtedness to the Company or a Significant Restricted Subsidiary), and
  (a) such Subsidiary has total assets of $1,000 or less, (b) such Subsidiary
  has assets of more than $1,000 and an Investment in such Subsidiary in an
  amount equal to the Fair Market Value of such Subsidiary would then be
  permitted under the first paragraph of "--Limitation on Restricted
  Payments" or (c) such designation is effective immediately upon such Person
  becoming a Subsidiary. Unless so designated as an Unrestricted Subsidiary,
  any Person that becomes a Subsidiary of the Company shall be classified as
  a Restricted Subsidiary thereof.
 
    (ii) The Company may designate any Unrestricted Subsidiary to be a
  Restricted Subsidiary; provided that (a) no Default or Event of Default
  shall have occurred and be continuing at the time of or after giving effect
  to such designation and (b) all Liens and Indebtedness of such Unrestricted
  Subsidiary outstanding immediately after such designation would, if
  Incurred at such time, have been permitted to be Incurred (and shall be
  deemed to have been Incurred) for all purposes of the Indenture.
 
    (iii) The designation of a Subsidiary as an Unrestricted Subsidiary or
  the designation of an Unrestricted Subsidiary as a Restricted Subsidiary in
  compliance with clause (ii) shall be made by the Board of Directors
  pursuant to a Board Resolution and shall be effective as of the date
  specified in such Board Resolution.
 
                                      75
<PAGE>
 
 Reports
 
  The Company has agreed that, for so long as any Notes remain outstanding, it
will furnish to the Holders, to securities analysts and to prospective
investors, upon their request, the information required to be delivered
pursuant to Rule 144A(d)(4) under the Securities Act. The Company will file
with the Trustee within 15 days after it files them with the Commission copies
of the annual reports on Form 10-K and the information, documents, and other
reports that the Company is required to file with the Commission pursuant to
Section 13 or 15(d) of the Exchange Act as well as quarterly reports ("SEC
Reports"). In the event the Company shall cease to be required to file SEC
Reports pursuant to either of such sections of the Exchange Act, the Company
will nevertheless continue to file such reports with the Commission (unless
the Commission will not accept such a filing) and the Trustee. The Company
will furnish copies of the SEC Reports to the Holders of Notes at the time the
Company is required to file the same with the Trustee.
 
AMALGAMATION, CONSOLIDATION, MERGER, CONVEYANCE, LEASE OR TRANSFER
 
  The Company will not, in any transaction or series of related transactions,
amalgamate or consolidate with, or merge with or into, any other Person (other
than a merger of a Restricted Subsidiary into the Company in which the Company
is the surviving corporation), or sell, convey, assign, transfer, lease or
otherwise dispose of all or substantially all of the Property and assets of
the Company and its Restricted Subsidiaries taken as a whole to any other
Person, unless:
 
    (i) either (a) the Company shall be the surviving corporation or (b) the
  corporation (if other than the Company) formed by such amalgamation or
  consolidation or into which the Company is merged, or the Person which
  acquires, by sale, assignment, conveyance, transfer, lease or disposition,
  all or substantially all of the Property and assets of the Company and the
  Restricted Subsidiaries taken as a whole (such corporation or Person, the
  "Surviving Entity"), shall be a corporation organized and validly existing
  under the laws of the United States of America, any political subdivision
  thereof, any state thereof or the District of Columbia and shall expressly
  assume, by a supplemental indenture, the due and punctual payment of the
  principal of (and premium, if any) and interest on all the Notes and the
  performance of the Company's covenants and obligations under the Indenture;
 
    (ii) immediately after giving effect to such transaction or series of
  related transactions on a pro forma basis (including, without limitation,
  any Indebtedness incurred in connection with or in respect of such
  transaction or series of related transactions), no Default shall have
  occurred and be continuing;
 
    (iii) immediately after giving effect to such transaction or series of
  related transactions on a pro forma basis (including, without limitation,
  any Indebtedness incurred in connection with or in respect of, and any
  Indebtedness to be repaid in connection with or as a result of, such
  transaction or series of related transactions), the Company (or the
  Surviving Entity, if the Company is not the surviving corporation) (A)
  shall have a Consolidated Net Worth equal to or greater than the
  Consolidated Net Worth of the Company immediately prior to such transaction
  and (B) would be permitted to Incur at least $1 of additional Indebtedness
  pursuant to the first paragraph of the covenant "--Limitation on
  Consolidated Indebtedness"; provided that this clause (iii)(B) shall not
  apply to (x) a consolidation, merger or sale of all (but not less than all)
  of the assets of the Company if all Liens and Indebtedness of the Company
  or the Surviving Entity, as the case may be, and its Restricted
  Subsidiaries outstanding immediately after such transaction would, if
  Incurred at such time, have been permitted to be Incurred (and all such
  Liens and Indebtedness, other than Liens and Indebtedness of the Company
  and its Restricted Subsidiaries outstanding immediately prior to the
  transaction, shall be deemed to have been Incurred for all purposes of the
  Indenture) or (y) a consolidation, merger or sale of all or substantially
  all of the assets of the Company if immediately after giving effect to such
  transaction or series of related transactions on a pro forma basis
  (including, without limitation, any Indebtedness incurred in connection
  with or in respect of, and any Indebtedness to be repaid in connection with
  or as a result of, such transaction or series of related transactions) the
  Company's (or the Surviving Entity's) leverage ratio computed pursuant to
  the first paragraph under "--Limitation on Consolidated Indebtedness" would
  be equal to or less than the leverage ratio of the Company immediately
  prior to such transaction.
 
                                      76
<PAGE>
 
    (iv) if, as a result of any such transaction, Property of the Company
  would become subject to a Lien prohibited by the provisions of the
  Indenture described under "--Limitation on Liens" above, the Company or the
  Surviving Entity to the Company shall have secured the Notes as required
  thereby; and
 
    (v) the Company delivers to the Trustee an Officers' Certificate
  (attaching the arithmetic computations to demonstrate compliance with
  clause (iii)) and Opinion of Counsel, in each case stating that such
  consolidation, merger or transfer and such supplemental indenture complies
  with this provision and that all conditions precedent provided for herein
  relating to such transaction have been complied with.
 
EVENTS OF DEFAULT
 
  Each of the following is an "Event of Default" under the Indenture:
 
    (i) default in the payment of interest (including Additional Interest, if
  any) on any Note when the same becomes due and payable, and the continuance
  of such default for a period of 30 days;
 
    (ii) default in the payment of the principal of (or premium, if any, on)
  any Note at its maturity, upon optional redemption, including a Change in
  Control Redemption Offer, required repurchase (including pursuant to a
  Change of Control Offer or an Asset Sale Offer) or otherwise or the failure
  to make an offer to purchase any Note as required under the Indenture;
 
    (iii) default in the performance, or breach, of any covenant or warranty
  of the Company in the Indenture (other than a covenant or warranty
  addressed in clauses (i) or (ii) above) and continuance of such Default or
  breach for a period of 60 days after written notice thereof has been given
  to the Company by the Trustee or to the Company and the Trustee by Holders
  of at least 25% of the aggregate stated principal amount at maturity of the
  outstanding Notes;
 
    (iv) (a) any principal payment in excess of $1,000,000 with respect to
  Indebtedness of the Company or any Restricted Subsidiary is not paid when
  due within the applicable grace period, if any, or (b) Indebtedness of the
  Company or any Restricted Subsidiary is accelerated by the Holders thereof
  and the principal amount of such accelerated Indebtedness exceeds
  $5,000,000;
 
    (v) the entry by a court of competent jurisdiction of one or more final
  judgments against the Company or any Restricted Subsidiary in an uninsured
  or unindemnified aggregate amount in excess of $10,000,000 which is not
  discharged, waived, appealed, stayed, bonded or satisfied for a period of
  60 consecutive days; or
 
    (vi) certain events of bankruptcy, insolvency or reorganization affecting
  the Company or any Restricted Subsidiary shall occur.
 
  If any Event of Default (other than an Event of Default specified in clause
(vi) above) occurs and is continuing, then and in every such case either the
Trustee or the Holders of not less than 25% of the aggregate stated principal
amount at maturity of the outstanding Notes may declare the Accreted Value of,
and any accrued and unpaid Current Interest on, all Notes then outstanding to
be immediately due and payable by a notice in writing to the Company (and to
the Trustee if given by Holders), and upon any such declaration, such Accreted
Value and any accrued and unpaid Current Interest thereon will become and be
immediately due and payable. If any Event of Default specified in clause (vi)
above occurs, the Accreted Value of, and any accrued and unpaid Current
Interest on, the Notes then outstanding shall become immediately due and
payable without any declaration or other act on the part of either the Trustee
or any Holder. In the event of a declaration of acceleration because an Event
of Default set forth in clause (iv) above has occurred and is continuing, such
declaration of acceleration shall be automatically rescinded and annulled if
the event of default triggering such Event of Default pursuant to clause (iv)
shall be remedied, or cured or waived by the holders of the relevant
Indebtedness, within 60 days after such Event of Default.
 
  The Company will be required to deliver to the Trustee on or before a date
not more than 90 days after the end of each fiscal year a statement regarding
compliance with the Indenture. In addition, the Company is required within 30
days after becoming aware of any Default or Event of Default, to deliver to
the Trustee a statement
 
                                      77
<PAGE>
 
describing such Default or Event of Default, its status and what action the
Company is taking or proposes to take with respect thereto. The Trustee may
withhold from Holders notice of any continuing Default or Event of Default
(other than relating to the payment of principal or interest) if the Trustee
determines that withholding such notice is in the Holders' interest.
 
AMENDMENT, SUPPLEMENT AND WAIVER
 
  The Company and the Trustee may, at any time and from time to time, without
notice to or consent of any Holder of Notes, enter into one or more indentures
supplemental to the Indenture (i) to evidence the succession of another Person
to the Company in accordance with the terms of the Indenture and the
assumption by such successor of the covenants of the Company in the Indenture
and the Notes, (ii) to add to the covenants of the Company, for the benefit of
the Holders, or to surrender any right or power conferred upon the Company by
the Indenture, (iii) to add any additional Events of Default, (iv) to evidence
and provide for the acceptance of appointment under the Indenture of a
successor Trustee, (v) to secure the Notes, (vi) to cure any ambiguity in the
Indenture, to correct or supplement any provision in the Indenture which may
be inconsistent with any other provision therein or to add any other
provisions with respect to matters or questions arising under the Indenture;
provided such actions shall not adversely affect the interests of the Holders
in any material respect or (vii) to comply with the requirements of the
Commission or any other regulatory authority in order to effect or maintain
the qualification of the Indenture under the Trust Indenture Act.
 
  With the consent of the Holders of not less than a majority in stated
principal amount at maturity of the outstanding Notes, the Company and the
Trustee may enter into one or more indentures supplemental to the Indenture
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Indenture or modifying in any manner
the rights of the Holders; provided that no such supplemental indenture shall,
without the consent of the Holder of each outstanding Note: (i) change the
Stated Maturity of the principal of, or the due date of any installment of
interest on, any Note, or alter the redemption provisions thereof, or reduce
the principal amount thereof (or premium, if any), or the interest thereon
that would be due and payable upon Maturity thereof, or change the place of
payment where, or the coin or currency in which, any Note or any premium or
interest thereon is payable, (ii) reduce the percentage in stated principal
amount at maturity of the outstanding Notes, (iii) subordinate in right of
payment, or otherwise subordinate, the Notes to any other Indebtedness, (iv)
impair the right to institute suit for the enforcement of any payment with
respect to the Notes, (v) make any change that would result in the Company
being required to make any deduction or withholding from any payment made
under or with respect to the Notes or modify any provision of this paragraph
(except to increase any percentage set forth herein).
 
  The Holders of not less than a majority in stated principal amount at
maturity of the outstanding Notes may, on behalf of the Holders of all the
Notes, waive any past Default under the Indenture and its consequences, except
a Default (i) in the payment of any amount on any Note, or (ii) in respect of
a covenant or provision hereof which under the proviso to the prior paragraph
cannot be modified or amended without the consent of the Holder of each
outstanding Note affected.
 
 Satisfaction and Discharge of the Indenture, Defeasance
 
  The Company may terminate its obligations under the Indenture when (i)
either (a) all outstanding Notes have been delivered to the Trustee for
cancellation or (b) all such Notes not theretofore delivered to the Trustee
for cancellation have become due and payable, will become due and payable
within one year or are to be called for redemption within one year under
irrevocable arrangements satisfactory to the Trustee for the giving of notice
of redemption by the Trustee in the name and at the expense of the Company,
and the Company has irrevocably deposited or caused to be deposited with the
Trustee funds in an amount sufficient to pay and discharge the entire
indebtedness on the Notes not theretofore delivered to the Trustee for
cancellation, for principal of (or premium, if any, on) and interest to the
date of deposit or maturity or date of redemption, (ii) the Company has paid
or caused to be paid all sums payable by the Company under the Indenture and
(iii) the Company has delivered an Officers' Certificate and an Opinion of
Counsel relating to compliance with the conditions set forth in the Indenture.
 
                                      78
<PAGE>
 
  The Company, at its election, shall (i) be deemed to have paid and
discharged its debt on the Notes and the Indenture shall cease to be of
further effect as to all outstanding Notes (except as to (a) rights of
registration of transfer, substitution and exchange of Notes and the Company's
right of optional redemption, (b) rights of Holders to receive payments of
principal of, premium, if any, and interest on the Notes (but not the Change
of Control Purchase Price or the Offer Purchase Price), (c) the rights,
obligations and immunities of the Trustee under the Indenture and (d) certain
other specified provisions in the Indenture) and (ii) cease to be under any
obligation to comply with certain restrictive covenants including those
described under "--Certain Covenants," after the irrevocable deposit by the
Company with the Trustee, in trust for the benefit of the Holders, at any time
prior to the Maturity of the Notes, of (a) United States dollars in an amount,
(b) U.S. Government Obligations which through the payment of interest and
principal will provide, not later than one day before the due date of payment
in respect of the Notes, money in an amount, or (c) a combination thereof,
sufficient to pay and discharge the principal of, and interest on, the Notes
then outstanding on the dates on which any such payments are due in accordance
with the terms of the Indenture and of the Notes. Such defeasance or covenant
defeasance shall be deemed to occur only if certain conditions are satisfied,
including, among other things, delivery by the Company to the Trustee of an
opinion of independent counsel, reasonably acceptable to the Trustee to the
effect that (i) such deposit, defeasance and discharge will not be deemed, or
result in, a taxable event for U.S. federal income tax purposes with respect
to the Holders (and, in the case of defeasance only, such opinion of counsel
must be based on a ruling of the Internal Revenue Service or other change in
applicable U.S. federal income tax law), and (ii) the Company's deposit will
not result in the trust created thereby or the Trustee being subject to
regulation under the Investment Company Act of 1940, as amended.
 
THE TRUSTEE
 
  Harris Trust and Savings Bank will be the Trustee under the Indenture and
its current address is 111 West Monroe Street, Chicago, Illinois 60690-0755.
 
  The Holders of not less than a majority in stated principal amount at
maturity of the outstanding Notes will have the right to direct the time,
method and place of conducting any proceeding for exercising any remedy
available to the Trustee, subject to certain exceptions. Except during the
continuance of an Event of Default, the Trustee will perform only such duties
as are specifically set forth in the Indenture. The Indenture provides that in
case an Event of Default shall occur (which shall not be cured or waived), the
Trustee will be required, in the exercise of its rights and powers under the
Indenture, to use the degree of care of a prudent person in the conduct of
such person's own affairs. Subject to such provisions, the Trustee will be
under no obligation to exercise any of its rights or powers under the
Indenture at the request of any of the Holders, unless such Holders shall have
offered to the Trustee indemnity satisfactory to it against any loss,
liability or expense.
 
 No Personal Liability of Controlling Persons, Directors, Officers, Employees
and Stockholders
 
  No controlling Person, director, officer, employee, incorporator or
stockholder of the Company, as such, shall have any liability for any
covenant, agreement or other obligations of the Company under the Notes or the
Indenture or for any claim based on, in respect of, or by reason of, such
obligations or their creation, solely by reason of its past, present or future
status as a controlling Person, director, officer, employee, incorporator or
stockholder of the Company. By accepting a Note each Holder waives and
releases all such liability (but only such liability). The waiver and release
are part of the consideration for issuance of the Notes. Nonetheless, such
waiver may not be effective to waive liabilities under the Federal securities
laws and it has been the view of the Commission that such a waiver is against
public policy.
 
GOVERNING LAW
 
  The Indenture and the Notes will be governed by and construed in accordance
with the laws of the State of New York without giving effect to its conflicts
of laws provisions.
 
TRANSFER AND EXCHANGE
 
  The Senior Notes will be subject to certain restrictions on transfer. A
Holder may transfer or exchange Notes in accordance with the Indenture. The
Company, the Registrar and the Trustee may require a Holder, among
 
                                      79
<PAGE>
 
other things, to furnish appropriate endorsements and transfer documents and
the Company may require a Holder to pay any taxes and fees required by law or
permitted by the Indenture.
 
EXCHANGE OFFER; REGISTRATION RIGHTS
 
  The Company entered into a Registration Agreement with the Initial
Purchasers for the benefit of the holders of Senior Notes, pursuant to which
the Company has filed a Registration Statement (of which this Prospectus
constitutes a part) with the Commission (the "Exchange Offer") registering the
exchange of the Senior Notes for the Exchange Notes having terms substantially
identical in all material respects to the Senior Notes (except that the
Exchange Notes will not contain terms with respect to transfer restrictions
and will not be entitled to certain benefits under the Registration
Agreement). The Company will offer the Exchange Notes in exchange for
surrender of the Senior Notes. Pursuant to the Registration Agreement, the
Company will keep the Exchange Offer open for not less than 30 days (or longer
if required by applicable law) after the date notice of the Exchange Offer is
mailed to the holders of the Senior Notes. For each Senior Note surrendered to
the Company pursuant to the Exchange Offer, the holder of such Senior Note
will receive an Exchange Note having a stated principal amount at maturity
equal to that of the surrendered Senior Note. Under existing Commission
interpretations, the Exchange Notes would be freely transferable by holders
other than affiliates of the Company after the Exchange Offer without further
registration under the Securities Act if the holder of the Exchange Notes
represents that it is acquiring the Exchange Notes in the ordinary course of
its business, that it has no arrangement or understanding with any person to
participate in the distribution of the Exchange Notes and that it is not an
affiliate of the Company, as such terms are interpreted by the Commission;
provided that broker-dealers ("Participating Broker-Dealers") receiving
Exchange Notes in the Exchange Offer will have a prospectus delivery
requirement with respect to resales of such Exchange Notes. The Commission has
taken the position that Participating Broker-Dealers may fulfill their
prospectus delivery requirements with respect to Exchange Notes (other than a
resale of an unsold allotment from the original sale of the Senior Notes) with
the prospectus contained in the Registration Statement. Under the Registration
Agreement, the Company is required to allow Participating Broker-Dealers and
other persons, if any, with similar prospectus delivery requirements to use
this Prospectus in connection with the resale of such Exchange Notes. The
Registration Statement will be kept effective for a period of 90 days after
the Exchange Offer has been consummated in order to permit resales of Exchange
Notes acquired by broker-dealers in after-market transactions.
 
  A holder of Senior Notes (other than certain specified holders) who wishes
to exchange such Senior Notes for Exchange Notes in the Exchange Offer will be
required to represent that any Exchange Notes to be received by it will be
acquired in the ordinary course of its business and that at the time of the
commencement of the Exchange Offer it has no arrangement or understanding with
any person to participate in the distribution (within the meaning of the
Securities Act) of the Exchange Notes and that it is not an "affiliate" of the
Company, as defined in Rule 405 of the Securities Act, or if it is an
affiliate, that it will comply with the registration and prospectus delivery
requirements of the Securities Act to the extent applicable.
 
  The Company has filed the Registration Statement and will commence the
Exchange Offer pursuant to the Registration Agreement. In the event that (i)
applicable interpretations of the staff of the Commission do not permit the
Company to effect the Exchange Offer, (ii) for any other reason the
Registration Statement is not declared effective within 180 days after the
date of original issuance of the Senior Notes, (iii) the Exchange Offer is not
consummated (the term "consummated" as used in this context shall mean that
the Company has offered the Exchange Notes in exchange for surrender of the
Senior Notes, kept such offer open for the period of time required above and
fulfilled all of its other obligations under such offer) within 210 days after
the date of original issuance of the Senior Notes, (iv) the Initial Purchasers
so request with respect to Senior Notes held by such Initial Purchasers and
thus not eligible to be exchanged for Exchange Notes in the Exchange Offer, or
(v) any holder of the Senior Notes (other than an Initial Purchaser or any
affiliate of the Company) does not receive freely tradeable Exchange Notes in
the Exchange Offer (it being understood that, for purposes of this clause (v),
(a) the requirement that a holder deliver a prospectus containing the
information required by Items 507 and/or 508 of Regulation S-K under the
Securities Act in connection with sales of Exchange Notes acquired in exchange
 
                                      80
<PAGE>
 
for the Senior Notes shall result in such Exchange Notes being not "freely
tradeable" but (b) the requirement that a Participating Broker-Dealer deliver
a prospectus in connection with sales of Exchange Notes acquired in the
Exchange Offer in exchange for Senior Notes acquired as a result of market
making activities or other trading activities shall not result in the Exchange
Notes being not "freely tradeable"), the Company will, at its cost, (x) as
promptly as practicable, file a Shelf Registration Statement covering resales
of the Senior Notes or the Exchange Notes, as the case may be, (y) use its
reasonable best efforts to cause the Shelf Registration Statement to be
declared effective under the Securities Act and (z) keep the Shelf
Registration Statement effective until two years (or any shorter period under
Rule 144(k) under the Securities Act) after its effective date (or until one
year after such effective date if such Shelf Registration Statement is filed
at the request of an Initial Purchaser) or such shorter period that will
terminate when all the Senior Notes or Exchange Notes, as applicable, covered
by the Shelf Registration Statement have been sold. The Company will, in the
event a Shelf Registration Statement is filed, among other things, provide to
each holder for whom such Shelf Registration Statement was filed copies of the
prospectus which is a part of the Shelf Registration Statement, notify each
such holder when the Shelf Registration Statement has become effective and
take certain other actions as are required to permit unrestricted resales of
the Senior Notes or the Exchange Notes, as the case may be. A holder selling
such Senior Notes or Exchange Notes pursuant to the Shelf Registration
Statement generally would be required to be named as a selling security holder
in the related prospectus and to deliver a prospectus to purchasers, will be
subject to certain of the civil liability provisions under the Securities Act
in connection with such sales and will be bound by the provisions of the
Registration Agreement which are applicable to such holder (including certain
indemnification obligations).
 
  In the event that (i) either the Exchange Offer has not been consummated or
the Shelf Registration Statement has not been declared effective on or prior
to the 210th day following the date of original issuance of the Senior Notes;
or (ii) after the Shelf Registration Statement has been declared effective,
such Registration Statement thereafter ceases to be effective or usable
(subject to certain exceptions) in connection with resales of Senior Notes or
Exchange Notes in accordance with and during the periods specified in the
Registration Agreement without being succeeded promptly by an additional
registration statement filed and declared effective (each such event referred
to in clauses (i) and (ii) a "Registration Default"), interest ("Additional
Interest") will accrue on the Senior Notes and the Exchange Notes (in addition
to the stated interest on the Senior Notes and the Exchange Notes) from and
including the date on which any such Registration Default shall occur to but
excluding the date on which all Registration Defaults have been cured.
Additional Interest will be payable in cash semiannually in arrears on August
15 and February 15 of each year, beginning on the August 15 or February 15
immediately following a Registration Default, at a rate per annum equal to
0.50% of the Accreted Value of the Notes (determined daily) at the end of each
subsequent 90-day period. In no event shall such rate per annum exceed 1.50%
of the Accreted Value of the Notes (determined daily) in the aggregate
regardless of the number of Registration Defaults.
 
  The summary herein of certain provisions of the Registration Agreement does
not purport to be complete and is subject to, and is qualified in its entirety
by reference to, all the provisions of the Registration Agreement, a copy of
which is available upon request to the Company.
 
CERTAIN DEFINITIONS
 
  Set forth below is a summary of certain of the defined terms used in the
Indenture. Reference is made to the Indenture for the full definition of all
such terms, as well as any capitalized terms used herein for which no
definition is provided.
 
  "Accreted Value" means, as of any date (the "Specified Date"), with respect
to each $1,000 stated principal amount at maturity of Notes the sum of (i) the
Issue Price of each Note and (ii) the amount of accrued but unpaid Deferred
Interest on such Note to the Specified Date such that:
 
                                      81
<PAGE>
 
    (a) If the Specified Date is one of the following dates (each a
  "Semiannual Accrual Date") the Accreted Value will be the amount set forth
  opposite such date below:
 
<TABLE>
<CAPTION>
                        SEMIANNUAL ACCRUAL DATE                   ACCRETED VALUE
                        -----------------------                   --------------
      <S>                                                         <C>
      February 18, 1998..........................................   $  555.66
      August 15, 1998............................................   $  588.77
      February 15, 1999..........................................   $  624.46
      August 15, 1999............................................   $  662.32
      February 15, 2000..........................................   $  702.47
      August 15, 2000............................................   $  745.06
      February 15, 2001..........................................   $  790.23
      August 15, 2001............................................   $  838.14
      February 15, 2002..........................................   $  888.95
      August 15, 2002............................................   $  942.84
      February 15, 2003 and thereafter...........................   $1,000.00
</TABLE>
 
    (b) If the Specified Date occurs before February 15, 2003, and between
  two Semiannual Accrual Dates, the Accreted Value shall be the sum of (x)
  the Accreted Value for the Semiannual Accrual Date immediately preceding
  the Specified Date and (y) an amount equal to the Deferred Interest accrued
  from such Semiannual Accrual Date to the Specified Date.
 
  "Acquired Indebtedness" means, with respect to any specified Person,
Indebtedness of any other Person existing at the time such other Person merged
with or into or became a Subsidiary of such specified Person; provided that
such Indebtedness was not incurred in connection with, or in anticipation or
contemplation of, such other Person merging with or into or becoming a
Subsidiary of such specified Person, but excluding Indebtedness which is
extinguished, retired or repaid in connection with such other Person merging
with or into or becoming a Subsidiary of such specified Person.
 
  "Affiliate" means, as to any Person, any other Person which directly or
indirectly controls, or is under common control with, or is controlled by,
such Person; provided that each Unrestricted Subsidiary shall be deemed to be
an Affiliate of the Company and of each other Subsidiary of the Company;
provided further that neither the Company nor any of its Restricted
Subsidiaries shall be deemed to be Affiliates of each other. For purposes of
this definition, "control" (including, with correlative meanings, the terms
"controlling," "under common control with" and "controlled by"), as used with
respect to any Person, shall mean the possession, directly or indirectly, of
the power to direct or cause the direction of the management or policies of
such Person, whether through the ownership of Voting Stock, by agreement or
otherwise.
 
  "Asset Sale" means any transfer, conveyance, sale, lease or other
disposition by the Company or any of its Restricted Subsidiaries (including an
amalgamation, consolidation or merger or other sale of any such Restricted
Subsidiary with, into or to any Person (other than the Company or any other
Restricted Subsidiary) in a transaction in which such Restricted Subsidiary
ceases to be a Restricted Subsidiary of the Company, but excluding a
disposition by a Restricted Subsidiary to the Company or a Significant
Restricted Subsidiary or by the Company to a Significant Restricted
Subsidiary) of (i) shares of Capital Stock or other ownership interests of a
Subsidiary of the Company (other than pursuant to an amalgamation, merger or
consolidation of a Restricted Subsidiary into the Company or any Restricted
Subsidiary), (ii) substantially all of the assets of the Company or any
Restricted Subsidiary representing a division or line of business (other than
as part of a Permitted Investment) or (iii) other assets or rights of the
Company or any of its Restricted Subsidiaries outside of the ordinary course
of business and, in each case, that is not governed by the provisions of the
Indenture applicable to amalgamations, consolidations, mergers, and transfers
of all or substantially all of the assets of the Company; provided that "Asset
Sale" shall not include (a) sales or other dispositions of inventory,
receivables and other current assets in the ordinary course of business or
sales or other dispositions of equipment that has become worn-out, obsolete or
damaged or otherwise unsuitable for use in connection with the business of the
Company or a Restricted Subsidiary, (b) contemporaneous exchanges by the
Company or any Restricted Subsidiary of
 
                                      82
<PAGE>
 
Telecommunications Assets for other Telecommunications Assets in the ordinary
course of business; provided that the applicable Telecommunications Assets
received by the Company or such Restricted Subsidiary have at least
substantially equal Fair Market Value to the Company or such Restricted
Subsidiary (as evidenced by a Board Resolution), or (c) the sale or other
disposition of any assets (x) with a Fair Market Value (as certified in an
Officers' Certificate) not in excess of $1,000,000 or (y) that constitute
Restricted Payments which are permitted under the covenant "--Limitation on
Restricted Payments" above.
 
  "Attributable Indebtedness" means, with respect to any Sale and Leaseback
Transaction of any Person, as at the time of determination, the greater of (i)
the capitalized amount in respect of such transaction that would appear on the
balance sheet of such Person in accordance with GAAP and (ii) the present
value (discounted at a rate consistent with accounting guidelines, as
determined in good faith by the responsible accounting officer of such Person)
of the payments during the remaining term of the lease (including any period
for which such lease has been extended or may, at the option of the lessor, be
extended) or until the earliest date on which the lessee may terminate such
lease without penalty or upon payment of a penalty (in which case the payments
during the remaining term shall include such penalty).
 
  "Average Life" means, as of any date, with respect to any debt security or
Disqualified Stock, the quotient obtained by dividing (i) the sum of the
products of (a) the number of years from such date to the dates of each
scheduled principal payment or redemption payment (including any sinking fund
or mandatory redemption payment requirements) of such debt security or
Disqualified Stock multiplied in each case by (b) the amount of such principal
or redemption payment, by (ii) the sum of all such principal or redemption
payments.
 
  "Board of Directors" means the Board of Directors of the Company or any
committee thereof duly authorized to act on behalf of the Board of Directors.
 
  "Board Resolution" means a copy of a resolution, certified by the Secretary
of the Company to have been a duly adopted resolution of the Board of
Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee within 60 days of adoption
thereof.
 
  "Capital Lease Obligation" of any Person means the obligation to pay rent or
other payment amounts under a lease of (or other Indebtedness arrangement
conveying the right to use) real or personal Property which is required to be
classified and accounted for as a capital lease or a liability on the face of
a balance sheet of such Person prepared in accordance with GAAP, and the
maturity thereof shall be the date of the last payment of rent or any amount
due under such lease prior to the first date upon which such lease may be
terminated by the lessee without payment of a penalty. The principal amount of
such obligation shall be the capitalized amount that would appear on the face
of a balance sheet of such Person in accordance with GAAP.
 
  "Capital Stock" in any Person means any and all shares, interests,
participation or other equivalents of an equity interest (however designated)
in such Person and any rights (other than Indebtedness convertible into an
equity interest), warrants or options to subscribe for or acquire an equity
interest in such Person.
 
  "Change of Control" shall be deemed to occur if (i) the sale, conveyance,
transfer or lease of all or substantially all of the assets of the Company to
any "Person" or "group" (as such term is used in Sections 13(d)(3) and
14(d)(2) of the Exchange Act, including any group acting for the purpose of
acquiring, holding or disposing of securities within the meaning of Rule 13d-
5(b)(i) under the Exchange Act), other than any Permitted Holder (as defined
below) or any Restricted Subsidiary, shall have occurred, (ii) any "Person" or
"group" (as the term is used in Sections 13(d)(3) and 14(d)(2) of the Exchange
Act, including any group acting for the purpose of acquiring, holding or
disposing of securities within the meaning of Rule 13d-5(b)(i) under the
Exchange Act), other than any Permitted Holder, becomes the "beneficial owner"
(as defined in Rule 13d-3 under the Exchange Act) of more than 50% of the
total voting power of all classes of the Voting Stock of the Company
(including any warrants, options or rights to acquire such Voting Stock),
calculated on a fully diluted basis, (iii) at any time after a Public Market
shall exist, during any period of two consecutive years, individuals who at
the beginning of such period constituted the Board of Directors (together with
(a) any directors whose
 
                                      83
<PAGE>
 
election or appointment by the Board of Directors or whose nomination for
election by the stockholders of the Company was approved by a vote of a
majority of the directors then still in office who were either directors at
the beginning of such period or whose election or nomination for election was
previously so approved and (b) any directors elected pursuant to the terms of
any shareholders' agreement among the Company's shareholders) cease for any
reason to constitute a majority of the Board of Directors then in office or
(iv) the merger, amalgamation or consolidation of the Company with or into
another Person or the merger of another Person with or into the Company shall
have occurred, and the securities of the Company that are outstanding
immediately prior to such transaction and which represent 100% of the
aggregate voting power of the Voting Stock of the Company are changed into or
exchanged for cash, securities or property, unless pursuant to such
transaction such securities are changed into or exchanged for, in addition to
any other consideration, securities of the surviving corporation that
represent immediately after giving effect to such transaction, at least a
majority of the aggregate voting power of the Voting Stock of the surviving
corporation.
 
  "Common Stock" means, with respect to the Company, the Class A Common Stock,
Class B Common Stock, Class C Common Stock or any similar common stock of the
Company.
 
  "Consolidated Cash Flow Available for Fixed Charges" for any period means
the Consolidated Net Income of the Company and its Restricted Subsidiaries for
such period increased, to the extent deducted in arriving at Consolidated Net
Income, by the sum of (i) Consolidated Interest Expense of the Company and its
Restricted Subsidiaries for such period, (ii) Consolidated Income Tax Expense
of the Company and its Restricted Subsidiaries for such period, (iii) the
consolidated depreciation and amortization expense of the Company and its
Restricted Subsidiaries for such period, (iv) any non-cash expense related to
the issuance to employees of the Company or any Restricted Subsidiary of
options to purchase Capital Stock of the Company or such Restricted
Subsidiary, (v) any charge related to any premium or penalty paid in
connection with redeeming or retiring any Indebtedness prior to its stated
maturity and (vi) any non-cash expense related to a purchase accounting
adjustment not requiring an accrual or reserve and separately disclosed in the
Company's consolidated statement of operations and deficit, and decreased by
the amount of any non-cash item that increases such Consolidated Net Income,
all as determined on a consolidated basis in accordance with GAAP; provided
that (a) there shall be excluded therefrom the Consolidated Cash Flow
Available for Fixed Charges (if positive) of any Restricted Subsidiary
(calculated separately for such Restricted Subsidiary in the same manner as
provided above for the Company) that is subject to a restriction which
prevents the payment of dividends or the making of distributions to the
Company or another Restricted Subsidiary to the extent of such restriction and
(b) (1) if, during or after such period, the Company or any of its Restricted
Subsidiaries shall have made any disposition of any Person or business, then
Consolidated Cash Flow Available for Fixed Charges of the Company and its
Restricted Subsidiaries shall be computed so as to give pro forma effect to
such disposition and (2) if, during or after such period, the Company or any
of its Restricted Subsidiaries completes an acquisition of any Person or
business which immediately after such acquisition is a Subsidiary of such
Person or whose assets are held directly by the Company or a Restricted
Subsidiary, then Consolidated Cash Flow Available for Fixed Charges shall be
computed so as to give pro forma effect to the acquisition of such Person or
business.
 
  "Consolidated Income Tax Expense" for any period means the aggregate amount
of the provisions for income taxes of the Company and its Restricted
Subsidiaries for such period calculated on a consolidated basis in accordance
with GAAP.
 
  "Consolidated Interest Expense" means for any period the interest expense
included in a consolidated income statement (excluding interest income) of the
Company and its Restricted Subsidiaries for such period in accordance with
GAAP, including without limitation or duplication (or, to the extent not so
included, with the addition of), (i) the amortization of Indebtedness discount
(including original issue discount), (ii) any payments or fees with respect to
letters of credit, bankers' acceptances or similar facilities, (iii) fees with
respect to interest rate swap or similar agreements or foreign currency hedge,
exchange or similar agreements, (iv) Preferred Stock dividends of the
Company's Restricted Subsidiaries (other than dividends paid in shares of
Preferred Stock that is not Disqualified Stock) declared and paid or payable,
(v) accrued Disqualified Stock dividends of the Company
 
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<PAGE>
 
and its Restricted Subsidiaries, whether or not declared or paid, (vi)
interest on Indebtedness guaranteed by the Company and its Restricted
Subsidiaries, (vii) the portion of any Capital Lease Obligation accruing
during such period that is allocable to interest expense in accordance with
GAAP, (viii) capitalized interest and (ix) commitment and other fees with
respect to senior credit facilities.
 
  "Consolidated Net Income" of the Company means, for any period, the
aggregate net income (or net loss) of the Company and its Restricted
Subsidiaries for such period on a consolidated basis determined in accordance
with GAAP; provided that there shall be excluded therefrom, without
duplication (i) all items classified as extraordinary or non-recurring, (ii)
any net income (or net loss) of any Person other than the Company and its
Restricted Subsidiaries, except to the extent of the amount of dividends or
other distributions actually paid to the Company or its Restricted
Subsidiaries by such other Person during such period, (iii) the net income (or
net loss) of any Person acquired by the Company or any of its Restricted
Subsidiaries in a pooling-of-interests transaction for any period prior to the
date of the related acquisition, (iv) any gain or loss, net of taxes, realized
on the termination of any employee pension benefit plan, (v) net gains (or net
losses) in respect of Asset Sales by the Company or its Restricted
Subsidiaries, (vi) the net income (or net loss) of any Restricted Subsidiary
to the extent that the payment of dividends or other distributions to the
Company is restricted by the terms of its constituting documents or any
agreement, instrument, contract, judgment, order, decree, statute, rule,
governmental regulation or otherwise, except for any dividends or
distributions actually paid by such Restricted Subsidiary to the Company,
(vii) with regard to a non-wholly owned Restricted Subsidiary, any aggregate
net income (or net loss) in excess of the Company's or such Restricted
Subsidiary's pro rata share of such non-wholly owned Restricted Subsidiary's
net income (or net loss), and (viii) the cumulative effect of changes in
accounting principles.
 
  "Consolidated Tangible Assets" of any Person means the total amount of
assets (less applicable reserves and other properly deductible items) which
under GAAP would be included on a consolidated balance sheet of such Person
and its Restricted Subsidiaries after deducting therefrom all goodwill, trade
names, trademarks, patents, unamortized debt discount and expense and other
like intangibles, which in each case under GAAP would be included on such
consolidated balance sheet.
 
  "Consolidated Net Worth" means, at any date of determination, stockholders'
equity as set forth on the most recently available quarterly or annual
consolidated balance sheet of the Company and its Restricted Subsidiaries
(which shall be as of a date not more than 90 days prior to the date of such
computation, and which shall not take account of Unrestricted Subsidiaries),
less any amounts attributable to Disqualified Stock or any equity security
convertible into or exchangeable for Indebtedness, the cost of treasury stock
and the principal amount of any promissory notes receivable from the sale of
the Capital Stock of the Company or any of its Restricted Subsidiaries, each
item to be determined in conformity with GAAP.
 
  "Default" means any event, act or condition, the occurrence of which is, or
after notice or the passage of time or both would be, an Event of Default.
 
  "Disqualified Stock" means any Capital Stock which, by its terms (or by the
terms of any security into which it is convertible or for which it is
exchangeable), or upon the happening of any event, or otherwise, matures or is
mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or
is redeemable at the option of the holder thereof, or is exchangeable for
Indebtedness by the holder thereof at any time, in whole or in part, on or
prior to the Stated Maturity of the Notes.
 
  "Eligible Cash Equivalents" means any of the following: (i) any investment
in direct obligations of the United States of America or any agency thereof or
obligations guaranteed by the United States of America or any agency thereof
in each case with a term of not more than one year, (ii) investments in time
deposit accounts, term deposit accounts, certificates of deposit, money-market
deposits, bankers acceptances and obligations maturing within one year of the
date of acquisition thereof issued by a bank or trust company which is
organized under the laws of the United States of America or any state thereof
and which bank or trust company has, or the obligation of which bank or trust
company is guaranteed by a bank or trust company which has, capital, surplus
and undivided profits aggregating in excess of $150,000,000 and has
outstanding debt which is rated "A" (or
 
                                      85
<PAGE>
 
such similar equivalent rating) or higher by at least one "nationally
recognized statistical rating organization" (as defined in Rule 436 under the
Securities Act) or any money-market fund sponsored by a registered broker
dealer or mutual fund distributor, (iii) repurchase obligations with a term of
not more than 30 days for underlying securities of the types described in
clause (i) above entered into with a bank meeting the qualifications described
in clause (ii) above, (iv) investments in commercial paper, maturing not more
than 180 days after the date of acquisition, issued by a corporation (other
than an Affiliate of the Company) organized and in existence under the laws of
the United States of America with a rating at the time as of which any
investment therein is made of "P-1" (or higher) according to Moody's Investors
Service, Inc. or "A-1" (or higher) according to Standard & Poor's Corporation
and (v) investments in securities with maturities of six months or less from
the date of acquisition issued or fully guaranteed by any state, commonwealth,
territory or province of the United States of America or by any political
subdivision or taxing authority thereof, and rated at least "A" by Standard &
Poor's Corporation or "A-2" by Moody's Investors Service, Inc.
 
  "Fair Market Value" means, with respect to any asset or Property, the sale
value that would be obtained in an arm's-length transaction between an
informed and willing seller under no compulsion to sell and an informed and
willing buyer under no compulsion to buy, as determined in good faith by the
Board of Directors.
 
  "GAAP" means generally accepted accounting principles in the United States,
consistently applied, which are in effect on the date of the Indenture.
 
  "Guarantee" means any direct or indirect obligation, contingent or
otherwise, of a Person guaranteeing or having the economic effect of
guaranteeing any Indebtedness of any other Person in any manner (and
"Guaranteed," "Guaranteeing" and "Guarantor" shall have meanings correlative
to the foregoing); provided that the term "Guaranteed" and any meaning
correlative thereto shall not include endorsements for collection or deposit.
 
  "Holder" means (i) in the case of any Certificated Note, the Person in whose
name such Certificated Note is registered in the Note Register and (ii) in the
case of any Global Note, the Depositary.
 
  "Incur" means, with respect to any Indebtedness or other obligation of any
Person, to create, issue, incur (by conversion, exchange or otherwise),
assume, Guarantee or otherwise become liable in respect of such Indebtedness
or other obligation including by acquisition of Subsidiaries or the recording,
as required pursuant to GAAP or otherwise, of any such Indebtedness or other
obligation on the balance sheet of such Person (and "Incurrence," "Incurred,"
"Incurrable" and "Incurring" shall have meanings correlative to the
foregoing); provided that a change in GAAP that results in an obligation of
such Person that exists at such time becoming Indebtedness shall not be deemed
an Incurrence of such Indebtedness and that the accrual of interest shall not
be deemed an Incurrence of Indebtedness. Indebtedness otherwise Incurred by a
Person before it becomes a Subsidiary of the Company (whether by merger,
amalgamation, consolidation, acquisition or otherwise) shall be deemed to have
been Incurred by the Company at the time at which such Person becomes a
Subsidiary of the Company.
 
  "Indebtedness" means, at any time (without duplication), with respect to any
Person, whether recourse is to all or a portion of the assets of such Person,
and whether or not contingent, (i) any obligation of such Person for money
borrowed, (ii) any obligation of such Person evidenced by bonds, debentures,
notes, Guarantees or other similar instruments, including, without limitation,
any such obligations incurred in connection with the acquisition of Property,
assets or businesses, excluding trade accounts payable made in the ordinary
course of business, (iii) any reimbursement obligation of such Person with
respect to letters of credit, bankers' acceptances or similar facilities
issued for the account of such Person, (iv) any obligation of such Person
issued or assumed as the deferred purchase price of Property or services (but
excluding trade accounts payable or accrued liabilities arising in the
ordinary course of business, which in either case are being contested in good
faith), (v) any Capital Lease Obligation of such Person, (vi) the maximum
fixed redemption or repurchase price of Disqualified Stock of such Person and,
to the extent held by Persons other than such Person or its Restricted
Subsidiaries, the maximum fixed redemption or repurchase price of Preferred
Stock of such Person's Restricted Subsidiaries, at
 
                                      86
<PAGE>
 
the time of determination, (vii) any Attributable Indebtedness with respect to
any Sale and Leaseback Transaction to which such Person is a party, (viii)
Indebtedness of other Persons secured by a Lien to which the Property owned or
held by such first Person is subject, whether or not the obligation or
obligations secured thereby shall have been assumed (the amount of such
Indebtedness being deemed to be the lesser of the value of such property and
assets or the amount of the Indebtedness so secured) and (ix) any obligation
of the type referred to in clauses (i) through (viii) of this definition of
another Person and all dividends and distributions of another Person the
payment of which, in either case, such Person has Guaranteed or is responsible
or liable for, directly or indirectly, as obligor, Guarantor or otherwise. For
purposes of the preceding sentence, the maximum fixed repurchase price of any
Disqualified Stock or Preferred Stock that does not have a fixed repurchase
price shall be calculated in accordance with the terms of such stock as if
such stock were repurchased on any date on which Indebtedness shall be
required to be determined pursuant to the Indenture; provided that, if such
stock is not then permitted to be repurchased, the repurchase price shall be
the book value of such stock. The amount of Indebtedness of any Person at any
date shall be the outstanding balance at such date of all unconditional
obligations as described above and, with respect to contingent obligations,
the maximum liability upon the occurrence of the contingency giving rise to
the obligation; provided that the amount outstanding at any time of any
Indebtedness issued with original issue discount is the face amount of such
Indebtedness less the remaining unamortized portion of the original issue
discount of such Indebtedness at such time as determined in conformity with
GAAP.
 
  "Investment" in any Person means any direct, indirect or contingent (i)
advance or loan to, Guarantee of any Indebtedness of, extension of credit or
capital contribution to such Person, (ii) the acquisition of any shares of
Capital Stock, bonds, notes, debentures or other securities of such Person, or
(iii) the acquisition, by purchase or otherwise, of all or substantially all
of the business, assets or stock or other evidence of beneficial ownership of
such Person; provided that Investments shall exclude extensions of trade
credit in the ordinary course of business. The amount of any Investment shall
be the original cost of such Investment, plus the cost of all additions
thereto and minus the amount of any portion of such Investment repaid to such
Person in cash as a repayment of principal or a return of capital, as the case
may be, but without any other adjustments for increases or decreases in value,
or write-ups, write-downs or write-offs with respect to such Investment. In
determining the amount of any Investment involving a transfer of any Property
other than cash, such Property shall be valued at its Fair Market Value at the
time of such transfer.
 
  "Issue Date" means the date on which the Notes are first authenticated and
delivered under the Indenture.
 
  "Lien" means, with respect to any Property or other asset, any mortgage or
deed of trust, pledge, hypothecation, assignment, deposit arrangement,
security interest, lien (statutory or other), charge, setoff right, easement,
encumbrance, preference, priority or other security or similar agreement or
preferential arrangement of any kind or nature whatsoever on or with respect
to such Property or other asset (including, without limitation, any
conditional sale or title retention agreement having substantially the same
economic effect as any of the foregoing).
 
  "Maturity" means, when used with respect to a Note, the date on which the
principal of such Note becomes due and payable as provided therein or in the
Indenture, whether on the Stated Maturity, on the Change of Control Payment
Date or purchase date established pursuant to the terms of the Indenture with
regard to an Asset Sale Offer, as applicable, or by declaration of
acceleration, call for redemption or otherwise.
 
  "Net Cash Proceeds" means (i) with respect to the sale of any Property or
other assets by the Company or any of the Restricted Subsidiaries, cash or
readily marketable cash equivalents received net of (a) all reasonable out-of-
pocket expenses of the Company or such Restricted Subsidiary incurred in
connection with such sale, including, without limitation, all legal, title and
recording tax expenses, commissions and other fees and expenses incurred (but
excluding any finder's fee or broker's fee payable to any Affiliate of the
Company) and all U.S. federal, state, provincial, foreign and local taxes
arising in connection with such sale that are paid or required to be accrued
as a liability under GAAP by the Company or its Restricted Subsidiaries, (b)
all payments made or required to be made by the Company or its Restricted
Subsidiaries on any Indebtedness which is secured by
 
                                      87
<PAGE>
 
such Properties or other assets in accordance with the terms of any Lien upon
or with respect to such Properties or other assets or which must, by the terms
of such Lien, or in order to obtain a necessary consent to such transaction or
by applicable law, be repaid in connection with such sale, (c) all
contractually required distributions and other payments made to minority
interest holders (but excluding distributions and payments to Affiliates of
the Company) in Restricted Subsidiaries as a result of such transaction and
(d) appropriate amounts to be provided by the Company or any Restricted
Subsidiary, as the case may be, as a reasonable reserve against any
liabilities associated with such assets and retained by the Company or any
Restricted Subsidiary thereof, as the case may be, after such transaction,
including, without limitation, liabilities under any indemnification
obligations and severance and other employee termination costs associated with
such transaction, in each case as determined by the Board of Directors, in its
reasonable good faith judgment evidenced by a Board Resolution; provided that,
in the event that any consideration for a transaction (which would otherwise
constitute Net Cash Proceeds) is required to be held in escrow pending
determination of whether a purchase price adjustment or indemnification or
other payment or similar adjustment will be made, such consideration (or any
portion thereof) shall become Net Cash Proceeds only at such time as it is
released to the Company or the Restricted Subsidiaries from escrow; and
provided, further, that any noncash consideration received in connection with
any transaction, which is subsequently converted to cash, shall be deemed to
be Net Cash Proceeds at such time, and shall thereafter be applied in
accordance with the Indenture and (ii) with respect to any sale, issuance,
transfer or other disposition of Capital Stock, the proceeds of such sale,
issuance, transfer or other disposition in the form of cash or cash
equivalents, net of attorneys' fees, accountants' fees, underwriters' or
placement agents' fees, discounts or commissions and brokerage, consultant and
other fees and reasonable out-of-pocket expenses of the Company or any
Subsidiary of the Company incurred in connection with such sale, issuance,
transfer or other disposition and net of taxes paid or payable as a result
thereof.
 
  "Officers' Certificate" means a certificate signed by (i) the President or
the Chief Executive Officer and (ii) the Chief Financial Officer, the Chief
Accounting Officer or the Treasurer, of the Company and delivered to the
Trustee, which shall comply with the Indenture.
 
  "Permitted Holders" means Madison Dearborn Capital Partnership, L.P.,
Frontenac V.I. L.P., and Battery Ventures III, L.P., and Affiliates (other
than the Company and the Restricted Subsidiaries) of each of the foregoing.
 
  "Permitted Investments" means (i) Eligible Cash Equivalents, (ii)
Investments in any Person engaged in a Telecommunications Business as a result
of which such Person becomes a Restricted Subsidiary in compliance with the
Indenture, (iii) Investments pursuant to agreements or obligations of the
Company or a Restricted Subsidiary, in effect on the Issue Date, to make
Investments described in clause (ii) above, (iv) Investments in prepaid
expenses, negotiable instruments held for collection and lease, utility and
workers' compensation, performance and other similar deposits, (v)
Investments, Capital Stock, bonds, notes, debentures or other debt or equity
securities received as a result of Asset Sales permitted under the covenant
described under "--Asset Sale," (vi) Investments in existence at the Issue
Date, (vii) commission, payroll, travel and similar advances made in the
ordinary course of business to cover matters that are expected at the time of
such advances ultimately to be treated as expenses in accordance with GAAP,
(viii) loans or advances to employees and directors made in the ordinary
course of business at any time outstanding not to exceed in the aggregate
$5,000,000 and (ix) stock, obligations or securities received in satisfaction
of judgments.
 
  "Permitted Liens" means (i) Liens for taxes, assessments, governmental
charges or claims which are not yet delinquent or which are being contested in
good faith by appropriate proceedings, if a reserve or other appropriate
provision, if any, as shall be required in conformity with GAAP shall have
been made therefor, (ii) other Liens incidental to the conduct of the
Company's or a Restricted Subsidiary's business or the ownership of its
Property and assets, and which do not in the aggregate materially detract from
the value of the Company's and its Restricted Subsidiaries' Property or other
assets when taken as a whole, or materially impair the use thereof in the
operation of its business, (iii) Liens with respect to assets of a Restricted
Subsidiary granted by such Restricted Subsidiary to secure Indebtedness owing
to the Company, (iv) Liens incurred or pledges and
 
                                      88
<PAGE>
 
deposits made in the ordinary course of business in connection with workers'
compensation and unemployment insurance and other types of social security,
(v) statutory Liens of landlords, carriers, warehousemen, mechanics,
materialmen, repairmen and other types of statutory obligations, (vi) deposits
made to secure the performance of tenders, bids, leases, surety and appeal
bonds, government contracts, performance and return-of money bonds and other
obligations of like nature incurred in the ordinary course of business
(exclusive of obligations for the payment of borrowed money), (vii) zoning
restrictions, servitudes, easements, rights-of-way, restrictions and other
similar charges or encumbrances incurred in the ordinary course of business
which, in the aggregate, do not materially detract from the value of the
Property subject thereto or interfere with the ordinary conduct of the
business of the Company or its Restricted Subsidiaries, (viii) Liens arising
out of judgments or awards against the Company or any Restricted Subsidiary
with respect to which the Company or such Restricted Subsidiary is prosecuting
an appeal or proceeding for review and the Company or such Restricted
Subsidiary is maintaining adequate reserves in accordance with GAAP, (ix) any
interest or title of a lessor in the Property subject to any lease other than
a Capital Lease, (x) leases or subleases granted to others that do not
materially interfere with the ordinary course of business of the Company and
its Restricted Subsidiaries, (xi) Liens encumbering Property or other assets
under construction arising from progress or partial payments by a customer of
the Company or its Restricted Subsidiaries relating to such Property or other
assets, (xii) Liens on Property of, or on shares of stock or Indebtedness of,
any corporation existing at the time such corporation becomes, or becomes a
part of, any Restricted Subsidiary, provided that such Liens do not extend to
or cover any Property or other assets of the Company or any Restricted
Subsidiary other than the Property or other assets acquired, (xiii) Liens
securing reimbursement obligations with respect to letters of credit that
encumber documents and other Property relating to such letters of credit and
the products and proceeds thereof, (xiv) Liens in favor of customs and revenue
authorities arising as a matter of law to secure payment of customs duties in
connection with the importation of goods, (xv) Liens arising out of
conditional sale, title retention, consignment or similar arrangements for the
sale of goods entered into by the Company or any of its Restricted
Subsidiaries in the ordinary course of business, (xvi) Liens on or sales of
receivables; and (xvii) Liens in favor of the Trustee pursuant to the
Indenture.
 
  "Person" means any individual, corporation, limited liability company,
partnership, limited liability partnership, joint venture, trust,
unincorporated organization or government or any agency or political
subdivision thereof.
 
  "Preferred Stock" of any Person means Capital Stock of such Person of any
class or classes (however designated) that ranks prior, as to the payment of
dividends or as to the distribution of assets upon any voluntary or
involuntary liquidation, dissolution or winding up of such Person, to shares
of Capital Stock of any other class of such Person.
 
  "Property" means, with respect to any Person, any interest of such Person in
any kind of property or other asset, whether real, personal or mixed, or
tangible or intangible, excluding Capital Stock of any other Person.
 
  "Public Equity Offering" means an underwritten primary public offering of
the Common Stock of the Company pursuant to an effective registration
statement under the Securities Act.
 
  A "Public Market" shall be deemed to exist if (i) a Public Equity Offering
has been consummated and (ii) at least 15% of the total issued and outstanding
Common Stock of the Company immediately prior to the consummation of such
Public Equity Offering has been distributed by means of an effective
registration statement under the Securities Act or sales pursuant to Rule 144
under the Securities Act.
 
  "Qualified Stock" of any Person means a class of Capital Stock other than
Disqualified Stock.
 
  "Restricted Payment" means (i) a dividend or other distribution declared or
paid on the Capital Stock of the Company or to the Company's stockholders (in
their capacity as such), or declared or paid to any Person other than the
Company or a Restricted Subsidiary on the Capital Stock of any Restricted
Subsidiary, in each case, other than dividends, distributions or payments made
solely in Qualified Stock of the Company or such Restricted Subsidiary and
other than pro rata dividends or other distributions made by a Restricted
Subsidiary
 
                                      89
<PAGE>
 
that is not a Significant Restricted Subsidiary to minority stockholders (or
owners of an equivalent interest in the case of a Restricted Subsidiary that
is an entity other than a corporation), (ii) a payment made by the Company or
any of its Restricted Subsidiaries (other than to the Company or any
Restricted Subsidiary) to purchase, redeem, acquire or retire any Capital
Stock of the Company or (iii) a payment made by the Company or any of its
Restricted Subsidiaries (other than a payment made solely in Qualified Stock
of the Company) to redeem, repurchase, defease (including an in-substance or
legal defeasance) or otherwise acquire or retire for value (including pursuant
to mandatory repurchase covenants), prior to any scheduled maturity, scheduled
sinking fund or mandatory redemption payment, Indebtedness of the Company
which is subordinate (whether pursuant to its terms or by operation of law) in
right of payment to the Notes and which was scheduled to mature on or after
the maturity of the Notes (other than permitted refinancings thereof) or (iv)
an Investment in any Person, including an Unrestricted Subsidiary or the
designation of a Subsidiary as an Unrestricted Subsidiary, other than (a) a
Permitted Investment, (b) an Investment by the Company in a Restricted
Subsidiary engaged in a Telecommunications Business or (c) an Investment by a
Restricted Subsidiary in the Company or in a Restricted Subsidiary engaged in
a Telecommunications Business.
 
  "Restricted Subsidiary" means any Subsidiary of the Company that has not
been designated as an "Unrestricted Subsidiary."
 
  "Sale and Leaseback Transaction" means, with respect to any Person, any
direct or indirect arrangement pursuant to which Property is sold or
transferred by such Person or a Restricted Subsidiary of such Person and is
thereafter leased back from the purchaser or transferee thereof by such Person
or one of its Restricted Subsidiaries.
 
  "Senior Indebtedness" means all Indebtedness of the Company which is not,
expressly by its terms, subordinate or junior in right of payment to the
Notes.
 
  "Significant Restricted Subsidiary" means any Restricted Subsidiary of which
the Company owns, directly or indirectly, 80% or more of all of the
outstanding Capital Stock or other ownership interests (other than any
director's qualifying shares).
 
  "Subordinated Indebtedness" means Indebtedness of the Company as to which
the payment of principal of (and premium, if any) and interest and other
payment obligations in respect of such Indebtedness shall be subordinate to
the prior payment in full of the Notes to at least the following extent: (i)
no payments of principal of (or premium, if any) or interest on or otherwise
due in respect of such Indebtedness may be permitted for so long as any
Default in the payment of principal (or premium, if any) or interest on the
Notes exists, (ii) in the event that any other Default exists, upon notice by
Holders of 25% or more of the aggregate stated principal amount at maturity of
the outstanding Notes to the Trustee, the Trustee shall have the right to give
notice to the Company and the holders of such Indebtedness (or trustees or
agents therefor) of a payment blockage, and thereafter no payments of
principal of (or premium, if any) or interest on or otherwise due in respect
of such Indebtedness may be made for a period of 179 days from the date of
such notice, and (iii) such Indebtedness may not (x) provide for payments of
principal of such Indebtedness at the stated maturity thereof or by way of a
sinking fund applicable thereto or by way of any mandatory redemption,
defeasance, retirement or repurchase thereof by the Company (including any
redemption, retirement or repurchase which is contingent upon events or
circumstances, but excluding any retirement required by virtue of acceleration
of such Indebtedness upon an event of default thereunder), in each case prior
to the final Stated Maturity of the Notes or (y) permit redemption or other
retirement (including pursuant to an offer to purchase made by the Company) of
such other Indebtedness at the option of the holder thereof prior to the final
Stated Maturity of the Notes, other than a redemption or other retirement at
the option of the holder of such Indebtedness (including pursuant to an offer
to purchase made by the Company) which is conditioned upon a change of control
of the Company pursuant to provisions substantially similar to those described
under "--Repurchase at the Option of Holders upon a Change of Control" (and
which shall provide that such Indebtedness will not be repurchased pursuant to
such provisions prior to the Company's repurchase of the Notes required to be
repurchased by the Company pursuant to the provisions described under "--
Repurchase at the Option of Holders upon a Change of Control").
 
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<PAGE>
 
  "Subsidiary" means, with respect to any Person, (i) any corporation more
than 50% of the outstanding shares of Voting Stock of which is owned, directly
or indirectly, by such Person, or by one or more other Subsidiaries of such
Person, or by such Person and one or more other Subsidiaries of such Person,
(ii) any general partnership, joint venture or similar entity, more than 50%
of the outstanding partnership or similar interests of which are owned,
directly or indirectly, by such Person, or by one or more other Subsidiaries
of such Person, or by such Person and one or more other Subsidiaries of such
Person and (iii) any limited partnership of which such Person or any
Subsidiary of such Person is a general partner.
 
  "Telecommunications Assets" means all assets, rights (contractual or
otherwise) and properties, real or personal, whether tangible or intangible,
used or intended for use in connection with a Telecommunications Business.
 
  "Telecommunications Business" means the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data
through owned or leased wireline or wireless transmission facilities, (ii)
creating, developing, constructing, installing, repairing, maintaining or
marketing communications-related systems, network equipment and facilities,
software and other products, or (iii) evaluating, owning, operating,
participating in or pursuing any other business that is primarily related to
those identified in the foregoing clauses (i) or (ii) above (in the case of
this clause (iii), however, in a manner consistent with the Company's manner
of business on the Issue Date), and shall, in any event, include all
businesses in which the Company or any of its Subsidiaries are engaged on the
Issue Date or have entered into agreements to engage in or to acquire a
company to engage in or contemplate engaging in, as expressly set forth in
this Prospectus; provided that the determination of what constitutes a
Telecommunications Business shall be made in good faith by the Board of
Directors.
 
  "Unrestricted Subsidiary" means any Subsidiary of the Company that the
Company has classified as an "Unrestricted Subsidiary" and that has not been
reclassified as a Restricted Subsidiary, pursuant to the terms of the
Indenture. See "--Restricted and Unrestricted Subsidiaries" for a description
of the conditions in which the Company may designate a Subsidiary of the
Company an "Unrestricted Subsidiary."
 
  "Voting Stock" means, with respect to any Person, securities of any class or
classes of Capital Stock in such Person entitling the holders thereof (whether
at all times or at the times that such class of Capital Stock has voting power
by reason of the happening of any contingency) to vote in the election of
members of the board of directors or comparable body of such Person.
 
  "Wholly Owned Restricted Subsidiary" of any Person means a Restricted
Subsidiary of such Person all of the outstanding Capital Stock or other
ownership interests (other than any director's qualifying shares) of which
shall at the time be owned by such Person or by one or more other Wholly Owned
Restricted Subsidiaries of such Person or by such Person and one or more other
Wholly Owned Restricted Subsidiaries of such Person.
 
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<PAGE>
 
                             PLAN OF DISTRIBUTION
 
  Each broker-dealer that receives Exchange Notes for its own account pursuant
to the Exchange Offer must acknowledge that it will deliver a prospectus in
connection with any resale of such Exchange Notes. This Prospectus, as it may
be amended or supplemented from time to time, may be used by a broker-dealer
in connection with resales of Exchange Notes received in exchange for Senior
Notes where such Senior Notes were acquired as a result of market-making
activities or other trading activities. The Company has agreed that, starting
on the Expiration Date and ending on the close of business 90 days after the
Expiration Date, it will make this Prospectus, as amended or supplemented,
available to any broker-dealer for use in connection with any such resale. In
addition, until   , 1998, all dealers effecting transactions in the Exchange
Notes may be required to deliver a prospectus.
 
  The Company will not receive any proceeds from any sale of Exchange Notes by
broker-dealers. Exchange Notes received by broker-dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the Exchange Notes or a combination of such
methods of resale, at market prices prevailing at the time of resale, at
prices related to such prevailing market prices or negotiated prices. Any such
resale may be made directly to purchasers or to or through brokers or dealers
who may receive compensation in the form of commissions or concessions from
any such broker-dealer and/or the purchasers of any such Exchange Notes. Any
broker-dealer that resells Exchange Notes that were received by it for its own
account pursuant to the Exchange Offer and any broker or dealer that
participates in a distribution of such Exchange Notes may be deemed to be an
"underwriter" within the meaning of the Securities Act and any profit of any
such resale of Exchange Notes and any commissions or concessions received by
any such persons may be deemed to be underwriting compensation under the
Securities Act. The Letter of Transmittal states that by acknowledging that it
will deliver and by delivering a prospectus, a broker-dealer will not be
deemed to admit that it is an "underwriter" within the meaning of the
Securities Act.
 
  For a period of 90 days after the Expiration Date, the Company will promptly
send additional copies of this Prospectus and any amendment or supplement to
this Prospectus to any broker-dealer that requests such documents in the
Letter of Transmittal. The Company has agreed to pay all expenses incident to
the Exchange Offer (including the expenses of one counsel for the holders of
the Senior Notes), other than commissions or concessions of any brokers or
dealers and will indemnify the holders of the Senior Notes (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.
 
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            CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS
 
CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS FOR U.S. HOLDERS
 
  The following, subject to the limitations set forth below, are the material
U.S. federal income tax consequences associated with the acquisition,
ownership, and disposition of the Notes. As used herein, a "U.S. Holder" means
a beneficial owner of a Note who purchased a Senior Note pursuant to the
Offering at the Issue Price that is for U.S. federal income tax purposes (i) a
citizen or resident of the United States; (ii) a corporation, partnership or
other entity created or organized in or under the laws of the United States or
any political subdivision thereof; (iii) an estate the income of which is
subject to U.S. federal income taxation regardless of its source; or (iv) a
trust if (A) a court within the United States is able to exercise primary
supervision over the administration of the trust and (B) one or more U.S.
fiduciaries have the authority to control all substantial decisions of the
trust. This summary deals only with Notes held as capital assets and does not
address persons with special tax situations, such as Non-U.S. Holders (as
defined herein), financial institutions, insurance companies, tax-exempt
organizations, dealers in securities or currencies, persons holding Notes as a
hedge against currency risks or that are part of a straddle or a conversion
transaction, or persons whose functional currency is not the U.S. dollar, and
does not discuss any aspect of state, local or foreign tax laws or any estate
or gift tax considerations.
 
  This summary is based upon the provisions of the Internal Revenue Code of
1986, as amended (the "Code"), the Treasury Regulations promulgated thereunder
(the "Regulations"), rulings and judicial decisions issued thereunder, all of
which may be repealed, revoked or modified, possibly with retroactive effect.
Holders of the Notes should consult their tax advisors regarding the U.S.
federal, state, local and foreign income and other tax considerations of the
purchase, exchange, ownership and disposition of the Notes.
 
  THE FOLLOWING DOES NOT PURPORT TO BE A DISCUSSION OF ALL POTENTIAL TAX
CONSEQUENCES. EACH HOLDER IS STRONGLY URGED TO CONSULT WITH ITS OWN TAX
ADVISORS TO DETERMINE THE IMPACT OF SUCH HOLDER'S PERSONAL TAX SITUATION ON
THE ANTICIPATED TAX CONSEQUENCES, INCLUDING THE TAX CONSEQUENCES UNDER STATE,
LOCAL, FOREIGN OR OTHER TAX LAWS, OF THE ACQUISITION, EXCHANGE OWNERSHIP AND
DISPOSITION OF THE NOTES.
 
THE EXCHANGE
 
  The exchange of Senior Notes for Exchange Notes will not be treated as an
exchange for U.S. federal income tax purposes because the Exchange Notes will
not differ materially in kind or extent from the Senior Notes. As a result,
holders who exchange their Senior Notes for Exchange Notes will not recognize
any income, gain or loss for U.S. federal income tax purposes. A U.S. Holder
will have the same adjusted issue price, adjusted basis and holding period in
the Exchange Notes immediately after the exchange as it had in the Senior
Notes immediately before the exchange.
 
ORIGINAL ISSUE DISCOUNT
 
 General
 
  Because the Senior Notes were issued at an Issue Price which was
substantially less than their stated principal amounts at maturity and because
Current Interest on the Notes will not be payable until August 15, 2003, the
Notes have been issued with OID, and each U.S. Holder will be required to
include in income in each year, in advance of the receipt of cash payments on
such Notes, that portion of the OID, computed on a constant yield basis,
attributable to each day during such year on which the U.S. Holder held the
Notes.
 
  In the event of a Registration Default as described under "Description of
the Exchange Notes--Exchange Offer; Registration Rights", Additional Interest
will accrue on the Notes in the manner described therein. According to the
Regulations, the possibility of a change in the interest rate will not affect
the amount of interest
 
                                      93
<PAGE>
 
income recognized by a U.S. Holder if the likelihood of the change, as of the
date the Notes are issued, is remote. The Company believes that the likelihood
of a change in the interest rate on the Notes is remote and does not intend to
treat the possibility of a change in the interest rate as affecting the yield
to maturity of any Note. Solely for purposes of determining the amount of OID,
the Notes would be treated as retired and reissued on any date the amount of
interest were changed for an amount equal to its adjusted issue price.
 
 The Amount of Original Issue Discount
 
  The amount of OID with respect to each Note is equal to the excess of (i)
its "stated redemption price at maturity" over (ii) its "issue price." The
"issue price" of the Notes is equal to the initial offering price to the
public (not including any bond house, broker or similar person or organization
acting in the capacity of an underwriter, placement agent or wholesaler) at
which a substantial amount of the Notes are sold. The "stated redemption price
at maturity" of each Note will include all payments to be made in respect
thereof, including any Current Interest payments. Accordingly, payments on the
Note (including principal and Current Interest payments) are not separately
included in a U.S. Holder's income as interest, but rather are treated first
as payments of accrued OID and then as payments of principal which reduce the
U.S. Holder's basis in the Notes.
 
  A U.S. Holder of a debt instrument issued with OID is required to include in
gross income for U.S. federal income tax purposes an amount equal to the sum
of the "daily portions" of such OID for all days during the taxable year on
which the holder holds the debt instrument. The daily portions of OID required
to be included in a holder's gross income in a taxable year will be determined
on a constant yield basis by allocating to each day during the taxable year on
which the holder holds the debt instrument a pro rata portion of the OID on
such debt instrument which is attributable to the "accrual period" in which
such day is included. Accrual periods with respect to a Note may be any set of
periods (which may be of varying lengths) selected by a U.S. Holder as long as
(i) no accrual period is longer than one year and (ii) each scheduled payment
of interest or principal on the Note occurs on either the first or final day
of an accrual period. The amount of OID attributable to each "accrual period"
will be equal to the product of (i) the "adjusted issue price" at the
beginning of such accrual period and (ii) the "yield to maturity" of the debt
instrument stated in a manner appropriately taking into account the length of
the accrual period. The "yield to maturity" is the discount rate that, when
used in computing the present value of all payments to be made under the
Notes, produces an amount equal to the issue price of the Notes. The "adjusted
issue price" of a Note at the beginning of an accrual period is generally
defined as the issue price of the Note plus the aggregate amount of OID that
accrued in all prior accrual periods, less any cash payments on the Note.
Accordingly, a U.S. Holder of a Note will be required to include OID thereon
in gross income for U.S. federal tax purposes in advance of the receipt of
cash in respect of such income. The amount of OID allocable to an initial
short accrual period may be computed using any reasonable method if all other
accrual periods, other than a final short accrual period, are of equal length.
The amount of OID allocable to the final accrual period at maturity of a Note
is the difference between (x) the amount payable at the maturity of the Note
and (y) the Note's adjusted issue price as of the beginning of the final
accrual period.
 
 High-Yield Discount Obligations
 
  The Notes constitute AHYDOs as their yield to maturity exceeds the sum of
the applicable federal rate in effect at the time of the issuance of the Notes
(the "AFR") plus five percentage points. For February 1998, the long-term AFR
was 5.84% (based on semiannual compounding). Under Sections 163(e) and 163(i)
of the Code, a C corporation that is an issuer of a debt obligation subject to
the AHYDO rules may not deduct any portion of OID on the obligation until such
portion is actually paid. A debt obligation is generally subject to the AHYDO
rules if (i) its maturity date is more than five years from the date of issue,
(ii) its yield to maturity equals or exceeds the sum of the AFR plus five
percentage points, and (iii) it bears "significant OID." A debt obligation
will bear significant OID for this purpose if, as of the close of any accrual
period ending more than five years after issuance, the total amount of income
includible by a holder with respect to the debt instrument exceeds the sum of
(i) the total amount of "interest" paid under the obligation before the close
of such accrual period and (ii) the product of the issue price of the debt
instrument and its yield to maturity. In addition, the yield to maturity of
the Notes exceeds the sum of the AFR plus six percentage points. Accordingly,
under the Code, a portion of
 
                                      94
<PAGE>
 
the OID under the Notes, equal to the product of the total OID under the Notes
times the ratio of (a) the excess of the yield to maturity over the sum of the
AFR plus six percentage points to (b) the yield to maturity (the "Disqualified
Portion"), will not be deductible by the Company and will be treated for some
purposes as dividends to the holders of the Notes (to the extent that such
amounts would have been treated as dividends to the holders of the Notes if
they had been distributions with respect to the Company's stock). The
Disqualified Portion will be nondeductible by the Company, and may qualify for
the dividend received deduction for corporate U.S. Holders, but will be
treated as OID and not as dividends for withholding tax purposes.
 
 Effect of Mandatory and Optional Redemptions on OID
 
  In the event of a Change of Control, the Company will be required to offer
to redeem all of the Notes, at redemption prices specified elsewhere herein.
If after giving effect to a Change of Control Offer at least 95% of the
original aggregate stated principal amount of the Notes has been repurchased,
the Company may, at its option, redeem the balance of the Notes at redemption
prices specified elsewhere herein. In the event that the Company receives net
proceeds from one or more public offerings, the Company may, at its option,
use all or a portion of such net proceeds to redeem Notes having an aggregate
issue price of up to 35% of the aggregate Issue Price of the Notes at
redemption prices specified elsewhere herein; provided that Notes having an
issue price equal to at least 65% of the original aggregate stated principal
amount of the Notes remain outstanding after such redemption. In addition,
upon an Asset Sale, the Company may in certain circumstances be required to
redeem all or part of the Notes. Computation of the yield and maturity of the
Notes is not affected by such redemption rights and obligations if, based on
all the facts and circumstances as of the issue date, the stated payment
schedule of the Notes (that does not reflect a Change of Control, an Asset
Sale, or a Public Equity Offering) is significantly more likely than not to
occur. The Company has determined that, based on all of the facts and
circumstances as of the issue date, it is significantly more likely than not
that the Notes will be paid according to their stated schedule.
 
  The Company may redeem the Notes, in whole or in part, at any time on or
after February 15, 2003, at redemption prices specified elsewhere herein plus
accrued and unpaid Current Interest, if any, on the Notes so redeemed to but
excluding the date of redemption. The Regulations contain rules for
determining the "maturity date" and the stated redemption price at maturity of
an instrument that may be redeemed prior to its stated maturity date at the
option of the issuer. Under the Regulations, solely for purposes of the
accrual of OID, it is assumed that the issuer will exercise any option to
redeem a debt instrument if such exercise will lower the yield-to-maturity of
the debt instrument. The Company believes that it will not be presumed to
redeem the Notes prior to their stated maturity under these rules because the
exercise of such option would not lower the yield-to-maturity of the Notes.
 
  U.S. Holders may wish to consult their tax advisor regarding the treatment
of such contingencies under the Regulations.
 
 Tax Basis
 
  A U.S. Holder's initial tax basis in a Note generally will be equal to the
purchase price paid by such U.S. Holder for such Note. A U.S. Holder's tax
basis in a Note will be increased by the amount of OID that is included in
such U.S. Holder's income and will be decreased by the amount of any cash
payments received.
 
 Sale or Redemption
 
  Unless a nonrecognition provision applies, the sale, exchange, redemption
(including pursuant to an offer by the Company) or other disposition of a Note
will be a taxable event for U.S. federal income tax purposes. In such event, a
U.S. Holder will recognize gain or loss equal to the difference between (i)
the amount of cash plus the fair market value of any property received by such
holder and (ii) the U.S. Holder's adjusted tax basis therein. Such gain or
loss will be capital gain or loss and will be long-term capital gain or loss
if the Note was held by the U.S. Holder for more than one year at the time of
such sale, exchange, redemption or other disposition. On
 
                                      95
<PAGE>
 
August 5, 1997, legislation was enacted which, among other things, reduces to
20% the maximum rate of tax on long-term capital gains on most capital assets
held by an individual for more than 18 months. Gain on most capital assets
held by an individual more than one year and up to 18 months is subject to tax
at a maximum rate of 28%. The distinction between capital gain or loss and
ordinary income or loss is also relevant for purposes of, among other things,
limitations on the deductibility of capital losses.
 
CERTAIN U.S. FEDERAL INCOME TAX CONSIDERATIONS FOR NON-U.S. HOLDERS
 
  The following summary describes certain United States federal income and
estate tax consequences of the ownership of Notes as of the date hereof by any
holder who is a beneficial owner of a Note but is not a U.S. Holder (a "Non-
U.S. Holder").
 
  Under present United States federal income and estate tax law, and subject
to the discussion below concerning backup withholding:
 
    (a) generally no withholding of United States federal income tax will be
  required with respect to the payment by the Company or any paying agent of
  principal or interest (including OID) on a Note owned by a Non-U.S. Holder,
  provided (i) that the beneficial owner does not actually or constructively
  own 10% or more of the total combined voting power of all classes of stock
  of the Company entitled to vote within the meaning of section 871(h)(3) of
  the Code and the regulations thereunder, (ii) the beneficial owner is not a
  "controlled foreign corporation" (as defined in Section 957 of the Code)
  that is related directly, indirectly or constructively to the Company
  through stock ownership and (iii) the beneficial owner satisfies the
  statement requirement (described generally below) set forth in section
  871(h) and section 881(c) of the Code and the regulations thereunder;
 
    (b) generally no withholding of United States federal income tax will be
  required with respect to any gain or income realized by a Non-U.S. Holder
  upon the sale, exchange or retirement of a Note and
 
    (c) a Note beneficially owned by an individual who at the time of death
  is a Non-U.S. Holder generally will not be includible in the individual's
  gross estate for the purposes of the United States federal estate tax as a
  result of such individual's death, provided that such individual does not
  at the time of death actually or constructively own 10% or more of the
  total combined voting power of all classes of stock of the Company entitled
  to vote within the meaning of section 871(h)(3) of the Code and provided
  that the interest payments with respect to such Note will not have been, if
  received at the time of such individual's death, effectively connected with
  the conduct of a United States trade or business by such individual.
 
  To satisfy the requirement referred to in (a)(iii) above, the beneficial
owner of such Note, or a financial institution holding the Note on behalf of
such owner, must provide, in accordance with specified procedures, the Company
or a paying agent of the Company with a statement to the effect that the
beneficial owner is not a U.S. person. Pursuant to current temporary
Regulations, these requirements will be met if (1) the beneficial owner
provides the payor his name and address, and certifies, under penalties of
perjury, that he is not a U.S. person (which certification may be made on an
Internal Revenue Service Form W-8 (or successor or substitute form)) or (2) a
financial institution that holds customers' securities in the ordinary course
of its trade or business and holds the Note on behalf of the beneficial owner
certifies, under penalties of perjury, that such statement has been received
by it (or by another financial institution acting on behalf of the Non-U.S.
Holder), and furnishes a paying agent with a copy thereof.
 
  Regulations recently issued by the Internal Revenue Service, which will be
effective for payments made after December 31, 1998 (subject to certain
transition rules), made modifications to the certification procedures
applicable to Non-U.S. Holders. In general, these regulations unify certain
certification procedures and forms and clarify and modify reliance standards.
A Non-U.S. Holder should consult its own advisor regarding the effect of the
new Regulations.
 
  If a Non-U.S. Holder cannot satisfy the requirements of the "portfolio
interest" exception described in (a) above, payments of interest (including
OID) made to Non-U.S. Holders will generally be subject to a 30%
 
                                      96
<PAGE>
 
withholding tax, or such lower rate as may be specified by an applicable
income tax treaty, unless the beneficial owner of the Note provides the
Company or its paying agent, as the case may be, with a properly executed (1)
Internal Revenue Service Form 1001 (or successor form) claiming an exemption
from withholding under the benefit of a tax treaty or (2) Internal Revenue
Service Form 4224 (or successor form) stating that interest (including OID)
paid on the Note is not subject to withholding tax because it is effectively
connected with the beneficial owner's conduct of a trade or business in the
United States.
 
  If a Non-U.S. Holder is engaged in a trade or business in the United States
and interest (including OID) on the Note is effectively connected with the
conduct of such trade or business, the Non-U.S. Holder, although exempt from
the withholding tax discussed above, will generally be subject to United
States federal income tax on such interest (including OID) on a net income
basis in the same manner as if it were a United States person. In addition, if
such holder is a foreign corporation, it may be subject to a branch profits
tax equal to 30% of its effectively connected earnings and profits for the
taxable year, or such lower rate as may be specified by an applicable income
tax treaty, subject to adjustments.
 
  Any gain or income realized upon the sale, exchange or retirement of a Note
generally will not be subject to United States federal income tax unless (i)
such gain or income is effectively connected with a trade or business in the
United States of the Non--U.S. Holder, or (ii) in the case of a Non-U.S.
Holder who is a nonresident alien individual, such Holder is present in the
United States for 183 days or more in the taxable year of such sale, exchange
or retirement, and certain other conditions are met.
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
  The "backup" withholding and information reporting requirements may apply to
certain payments of principal and interest (including OID) on a Note and to
certain payments or proceeds of the sale or retirement of a Note. The Company,
its agent, a broker, the Trustee or any paying agent, as the case may be, is
required to withhold tax from any payment that is subject to backup
withholding at a rate of 31% of such payment if the holder fails to furnish
his taxpayer identification number (social security number or employer
identification number), to certify that such holder is not subject to backup
withholding, or to otherwise comply with the applicable requirements of the
backup withholding rules. Certain holders (including, among others, all
corporations) are not subject to the backup withholding and reporting
requirements.
 
  Under current Treasury Regulations, backup withholding and information
reporting do not apply to payments made by the Company or any agent thereof
(in its capacity as such) to a holder of a Note who has provided the required
certification under penalties of perjury that it is not a U.S. Holder as set
forth in the third paragraph under "--Non-U.S. Holders" or has otherwise
established an exemption (provided that neither the Company nor such agent has
actual knowledge that the holder is a U.S. Holder or that the conditions of
any other exemption are not in fact satisfied). Payments of the proceeds from
the sale by a holder who is not a U.S. Holder of a Note made to or through a
foreign office of a broker will not be subject to U.S. information reporting
or backup withholding, except that if the broker is a U.S. person, a
controlled foreign corporation for U.S. tax purposes or a foreign person 50%
or more of whose gross income is effectively connected with a United States
trade or business for a specified three-year period, U.S. information
reporting may apply to such payments.
 
  Payments of the proceeds from the sale of a Note to or through the United
States office of a broker is subject to U.S. information reporting and backup
withholding unless the holder or beneficial owner certifies as to its non-U.S.
status or otherwise establishes an exemption from U.S. information reporting
and backup withholding.
 
  In October 1997, Regulations were issued which alter the foregoing rules in
certain respects and which generally will apply to any payments (including
OID) in respect of a Note or proceeds from the sale of a Note that are made
after December 31, 1998. Among other things, such regulations expand the
number of foreign intermediaries that are potentially subject to information
reporting and address certain documentary evidence requirements relating to
exemption from the general backup withholding requirements. Holders of the
Notes should consult their tax advisors concerning possible application of the
final regulations to amounts of OID that
 
                                      97
<PAGE>
 
they are required to include as well as the possible application of such
regulation to any payments made on or with respect to the Notes.
 
  Any amounts withheld under the backup withholding rules from a payment to a
holder may be claimed as a credit against such holder's United States federal
income tax liability.
 
  The Company is required to furnish certain information to the Internal
Revenue Service, and will furnish annually to record holders of Notes,
information with respect to interest and OID accruing during the calendar
year. The OID information will be based upon the adjusted issue price of the
debt instrument as if the holder were the original holder of the debt
instrument. No assurance can be given that the Internal Revenue Service will
not challenge the accuracy of the reported information. Subsequent holders who
purchase Notes for an amount other than the adjusted issue price and/or on a
date other than the last day of an accrual period will be required to
determine for themselves the amount of OID, if any, they are required to
include in gross income for U.S. federal income tax purposes.
 
                                 LEGAL MATTERS
 
  The legality of the Exchange Notes offered hereby are being passed upon for
the Company by Ross & Hardies, Chicago, Illinois.
 
                        INDEPENDENT PUBLIC ACCOUNTANTS
   
  The Consolidated Financial Statements as of December 31, 1996 and 1997 and
for the period from May 31, 1996 to December 31, 1996 and for the year ended
December 31, 1997 and the financial statement schedule included in this
Registration Statement have been audited by Arthur Andersen LLP, independent
public accountants, as stated in their reports appearing herein.     
 
                             AVAILABLE INFORMATION
 
  The Company has filed with the Commission, 450 Fifth Street, N.W.,
Washington, D.C. 20549, a Registration Statement on Form S-4 under the
Securities Act with respect to the Exchange Offer. As permitted by the rules
and regulations of the Commission, this Prospectus does not contain all the
information set forth in the Registration Statement. For further information
about the Company and the Exchange Offer, reference is made to the
Registration Statement and to the financial statements, exhibits and schedules
filed therewith. The statements contained in this Prospectus about the
contents of any contract or other document referred to are not necessarily
complete, and in each instance, reference is made to a copy of such contract
or other document filed as an exhibit to the Registration Statement, each such
statement being qualified in all respects by such reference. Copies of each
such document may be obtained from the Commission at its principal office in
Washington, D.C. upon payment of the charges prescribed by the Commission or,
in the case of certain such documents, by accessing the Commission's World
Wide Web site at http://www.sec.gov.
 
  The Company has agreed that, for so long as any Notes remain outstanding, it
will furnish to the Holders of the Notes and to securities analysts and
prospective investors, upon their request, the information required to be
delivered pursuant to Rule 144A(d)(4) under the Securities Act. The Company
will file with the Trustee after it files with the Commission copies of the
annual reports on Form 10-K and the information, documents, and other reports
that the Company is required to file with the Commission pursuant to Section
13 or 15(d) of the Exchange Act as well as quarterly reports (collectively,
the "SEC Reports"). In the event the Company ceases to be required to file SEC
Reports pursuant to either of such Sections of the Exchange Act, the Company
will nevertheless continue to file such reports with the Commission (unless
the Commission will not accept such a filing) and the Trustee. The Company
will furnish copies of the SEC Reports to the Holders of the Notes at the time
the Company is required to file the same with the Trustee.
 
                                      98
<PAGE>
 
GLOSSARY
 
  Access Charges--The charges paid by an interexchange carrier to a LEC for
the origination or termination of the IXC's customer's long distance calls.
 
  Access Line--A circuit that connects a telephone user (customer) to the
public switched telephone network.
 
  CLEC (Competitive Local Exchange Carrier)--A category of telephone service
provider (carrier) that offers services similar to the former monopoly local
telephone company, as recently allowed by changes in telecommunications law
and regulation. A CLEC may also provide other types of telecommunications
services (long distance, etc.)
 
  CLEC Certification--Granted by a state public service commission or public
utility commission, this allows a telecommunications service provider the
legal standing to offer local exchange telephone services in direct
competition with the incumbent LEC and other CLECs. Such certifications are
granted on a state by state basis.
 
  Central Office--The switching system (such as a DMS-500 by Nortel) used to
connect calls.
 
  Communications Act of 1934, The--The first major federal legislation that
established rules for broadcast and non-broadcast communications, both
wireless and wired telephony.
 
  DMS-500--A telephone switch manufactured by Nortel, that provides both local
exchange switching (also known as a "class 5" switch) and a long distance
switch (also known as a "class 4" switch) in a single device.
 
  FCC (Federal Communications Commission)--The United States Government
organization charged with the oversight of all public communications media.
 
  ILEC (Incumbent Local Exchange Carrier)--The local exchange carrier that was
the monopoly carrier, prior to the opening of local exchange services to
competition.
 
  Interconnection Agreement--A contract between an ILEC and a CLEC for the
interconnection of the party's networks, for the purpose of mutual passing of
traffic between the networks, allowing customers of one of the networks to
call users served by the other network. These agreements set out the financial
and operational aspects of such interconnection.
 
  Interim Number Portability--A temporary technique that allows local exchange
service customers of an ILEC to keep their existing telephone number, while
moving their service to a CLEC. This interim technique uses a central office
feature called remote call forwarding. The permanent solution to number
portability is to be implemented over the next few years.
 
  Fiber Optic Digital Network--A modern telephone technology that combines
voice and data switching in an efficient manner.
 
  ISP (Information Service Provider)--An information service provider which
allows for access to the Internet.
 
  IXC (Interexchange Carrier)--A provider of telecommunications services
between exchanges, or cities; also called long distance carrier. A long
distance carrier may offer services over its own or another carrier's
facilities.
 
  LEC (Local Exchange Carrier)--Any telephone service provider offering local
exchange services.
 
                                      99
<PAGE>
 
  Local Exchange--An area inside of which telephone calls are generally
completed without any toll, or long distance charges. Local exchange areas are
defined by the state regulator of telephone services.
 
  POP (Point of Presence)--A location where a carrier, usually an IXC, has
located transmission and terminating equipment to connect its network to the
networks of other carriers, or to customers.
 
  PUC (Public Utility Commission)--A state regulatory body, established in
most states, which regulates utilities, including telephone companies
providing intrastate services.
 
  Reciprocal Compensation--The compensation paid by a carrier to terminate
traffic on another carrier's network.
 
  RBOC (Regional Bell Operating Company)--One of the LECs created by the
divestiture of the local exchange business from AT&T in 1984. These include
BellSouth, Bell Atlantic, Ameritech, US West and SBC.
 
  Special Access Lines--Private, non-switched connections between an IXC and a
customer, for the purpose of connecting the customer's long distance calls
directly to the IXC's network, without having to pay the LEC's access charges.
 
  Switch--A device that opens or closes circuits or selects the paths or
circuits to be used for transmission of information. Switching is a process of
interconnecting circuits to form a transmission path between users. The DMS-
500 by Nortel is an example of a switch.
 
  Switched Services--Transmission of switched calls through the local switched
network.
 
                                      100
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS.................................. F-2
CONSOLIDATED FINANCIAL STATEMENTS:
  Consolidated Balance Sheets as of December 31, 1996, 1997 and March 31,
   1998................................................................... F-3
  Consolidated Statements of Operations for the Period from May 31, 1996
   (Commencement of Operations), to December 31, 1996, for the Year Ended
   December 31, 1997 and for the Three Months Ending March 31, 1997 and
   1998................................................................... F-4
  Consolidated Statements of Stockholders' Equity (Deficit) for the Period
   from May 31, 1996 (Commencement of Operations), to December 31, 1996,
   for the Year Ended December 31, 1997 and for the Three Months Ending
   March 31, 1997 and 1998................................................ F-5
  Consolidated Statements of Cash Flows for the Period from May 31, 1996
   (Commencement of Operations), to December 31, 1996, for the Year Ended
   December 31, 1997 and for the Three Months Ending March 31, 1997 and
   1998................................................................... F-6
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS................................ F-7
</TABLE>
 
                                      F-1
<PAGE>
 
                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Board of Directors of
 Focal Communications Corporation:
 
  We have audited the accompanying consolidated balance sheets of FOCAL
COMMUNICATIONS CORPORATION AND SUBSIDIARIES (a Delaware corporation) as of
December 31, 1996 and 1997, and the related consolidated statements of
operations, stockholders' deficit and cash flows for the period from May 31,
1996 (commencement of operations), to December 31, 1996, and for the year
ended December 31, 1997. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Focal
Communications Corporation and Subsidiaries as of December 31, 1996 and 1997,
and the results of its operations and its cash flows for the period from May
31, 1996 (commencement of operations), to December 31, 1996, and for the year
ended December 31, 1997, in conformity with generally accepted accounting
principles.
 
                                          Arthur Andersen LLP
 
Chicago, Illinois
January 14, 1998
 
                                      F-2
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                   MARCH 31,
                                        DECEMBER 31,  DECEMBER        1998
                ASSETS                      1996      31, 1997    (UNAUDITED)
                ------                  ------------ -----------  ------------
<S>                                     <C>          <C>          <C>
CURRENT ASSETS:
  Cash and cash equivalents............  $3,790,121  $ 2,256,552  $152,758,944
  Accounts receivable, trade (net of
   allowance for doubtful accounts of
   $469,000 and $1,046,000 at December
   31, 1997 and March 31, 1998,
   respectively).......................         --     2,355,814     5,196,879
  Related-party receivables............      16,883       34,883       120,349
  Other current assets.................         --        90,559       328,631
                                         ----------  -----------  ------------
    Total current assets...............   3,807,004    4,737,808   158,404,803
                                         ----------  -----------  ------------
FIXED ASSETS, at cost:
  Communications network...............         --     7,906,336    11,125,470
  Construction in progress.............      37,285    1,938,236     4,325,152
  Computer equipment...................      45,018      941,237     1,211,371
  Leasehold improvements...............         --       652,173     2,268,183
  Furniture and fixtures...............         --       355,759       437,337
  Motor vehicles.......................         --           --         19,289
                                         ----------  -----------  ------------
                                             82,303   11,793,741    19,386,802
  Less--Accumulated depreciation and
   amortization........................       1,150      616,967     1,260,951
                                         ----------  -----------  ------------
    Fixed assets, net..................      81,153   11,176,774    18,125,851
  Other non-current assets (net).......         --           --      5,697,368
                                         $3,888,157  $15,914,582  $182,228,022
                                         ==========  ===========  ============
 LIABILITIES AND STOCKHOLDERS' EQUITY
               (DEFICIT)
 ------------------------------------
CURRENT LIABILITIES:
  Accounts payable.....................  $  197,246  $ 1,502,479  $  5,256,228
  Accrued liabilities..................      71,212      367,890       497,404
  Current maturities of long-term
   debt................................         --       943,621           --
                                         ----------  -----------  ------------
    Total current liabilities..........     268,458    2,813,990     5,753,632
LONG-TERM DEBT, net of current
 maturities............................         --     2,593,265   152,093,513
                                         ----------  -----------  ------------
OTHER NONCURRENT LIABILITIES...........         --       179,481       269,222
                                         ----------  -----------  ------------
REDEEMABLE COMMON STOCK:
  Class A, $.01 par value, 85,567
   shares authorized and 80,307 issued
   and outstanding at December 31,
   1997................................   4,024,653   12,403,218           --
                                         ----------  -----------  ------------
STOCKHOLDERS' EQUITY (DEFICIT):
  Common stock, Class A, $.01 par
   value, 85,567 shares authorized and
   80,307 issued and outstanding at
   March 31, 1998......................         --           --            803
  Common stock, Class B, $.01 par
   value; 35,000 shares authorized,
   20,000 shares issued and outstanding
   at December 31, 1996, 1997 and March
   31, 1998............................         200          200           200
  Common stock, Class C, $.01 par
   value; 15,000 shares authorized,
   14,711 shares issued and outstanding
   at December 31, 1996, 1997 and March
   31, 1998............................         147          147           147
  Additional paid-in capital...........         --      (103,565)   26,098,850
  Accumulated deficit..................    (405,301)  (1,972,154)   (1,988,345)
                                         ----------  -----------  ------------
    Total stockholders' equity
     (deficit).........................    (404,954)  (2,075,372)   24,111,655
                                         ----------  -----------  ------------
                                         $3,888,157  $15,914,582  $182,228,022
                                         ==========  ===========  ============
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-3
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                          FOR THE PERIOD FROM
                             MAY 31, 1996       FOR THE    FOR THE THREE MONTHS
                           (COMMENCEMENT OF   YEAR ENDING    ENDING MARCH 31,
                            OPERATIONS) TO     DECEMBER    ---------------------
                           DECEMBER 31, 1996   31, 1997      1997        1998
                          ------------------- -----------  ---------  ----------
                                                               (UNAUDITED)
<S>                       <C>                 <C>          <C>        <C>
REVENUES................       $     --       $ 4,023,690  $     --   $5,102,448
EXPENSES:
  Customer service and
   network operations...             --         2,154,980      8,692   1,826,893
  Selling, general and
   administrative.......         421,777        2,887,372    416,492   1,307,625
  Depreciation and amor-
   tization.............           1,150          615,817      7,337     890,871
                               ---------      -----------  ---------  ----------
    Total operating ex-
     penses.............         422,927        5,658,169    432,521   4,025,389
                               ---------      -----------  ---------  ----------
    Operating income
     (loss).............        (422,927)      (1,634,479)  (432,521)  1,077,059
                               ---------      -----------  ---------  ----------
OTHER INCOME (EXPENSE):
  Interest income.......          17,626          195,696     43,055   1,015,902
  Interest expense......             --           128,070        135   2,109,152
                               ---------      -----------  ---------  ----------
                                  17,626           67,626     42,920  (1,093,250)
                               ---------      -----------  ---------  ----------
NET LOSS................       $(405,301)     $(1,566,853) $(389,601) $  (16,191)
                               ---------      -----------  ---------  ----------
ACCRETION TO REDEMPTION
 VALUE OF CLASS A COMMON
 STOCK..................             --          (103,565)   (25,891)        --
                               ---------      -----------  ---------  ----------
NET LOSS APPLICABLE TO
 COMMON STOCKHOLDERS....       $(405,301)     $(1,670,418) $(415,492) $  (16,191)
                               =========      ===========  =========  ==========
BASIC AND DILUTED NET
 LOSS PER SHARE OF COM-
 MON STOCK..............       $  (12.42)     $    (16.69) $   (4.18) $    (0.16)
                               =========      ===========  =========  ==========
BASIC AND DILUTED
 WEIGHTED AVERAGE NUMBER
 OF SHARES OF COMMON
 STOCK OUTSTANDING......          32,625          100,093     99,461     100,307
                               =========      ===========  =========  ==========
</TABLE>
 
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-4
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
 
 FOR THE PERIOD FROM MAY 31, 1996 (COMMENCEMENT OF OPERATIONS), TO DECEMBER 31,
   1996, FOR THE YEAR ENDED DECEMBER 31, 1997, AND FOR THE THREE MONTHS ENDED
                                 MARCH 31, 1998
 
<TABLE>
<CAPTION>
                                         CLASS A          CLASS B          CLASS C
                                      COMMON STOCK     COMMON STOCK     COMMON STOCK
                      COMMON STOCK   $.01 PAR VALUE   $.01 PAR VALUE   $.01 PAR VALUE   ADDITIONAL
                      -------------- ---------------- ---------------- ----------------   PAID-IN    ACCUMULATED
                      SHARES  AMOUNT SHARES   AMOUNT  SHARES   AMOUNT  SHARES   AMOUNT    CAPITAL      DEFICIT       TOTAL
                      ------  ------ -------- ------- -------- ------- -------- ------- -----------  -----------  -----------
<S>                   <C>     <C>    <C>      <C>     <C>      <C>     <C>      <C>     <C>          <C>          <C>
May 31, 1996
 (commencement of
 operations)......       --    $--        --   $  --       --   $  --       --   $  --         $--          $--          $--
 Issuance of
  common stock....     1,500    --        --      --       --      --       --      --          --           --           --
 Conversion of
  common stock to
  Class B common..    (1,125)   --        --      --    20,000     200      --      --          --           --           200
 Conversion of
  common stock to
  Class C common..      (375)   --        --      --       --      --    14,711     147         --           --           147
 Net loss.........       --     --        --      --       --      --       --      --          --      (405,301)    (405,301)
                      ------   ----  --------  ------ --------  ------ --------  ------ -----------  -----------  -----------
BALANCE,
 December 31, 1996..     --     --        --      --    20,000     200   14,711     147         --      (405,301)    (404,954)
 Accretion of
  redeemable
  common stock....       --     --        --      --       --      --       --      --     (103,565)         --      (103,565)
 Net loss.........       --     --        --      --       --      --       --      --          --    (1,566,853)  (1,566,853)
                      ------   ----  --------  ------ --------  ------ --------  ------ -----------  -----------  -----------
BALANCE,
 December 31, 1997..     --     --        --      --    20,000     200   14,711     147    (103,565)  (1,972,154)  (2,075,372)
 Adjustment to
  reflect
  amendment to
  stock purchase
  agreement.......       --     --     80,307     803      --      --       --      --   12,402,415          --    12,403,218
 Class A common
  capital
  contributions...       --     --        --      --       --      --       --      --   13,800,000          --    13,800,000
 Net Loss.........       --     --        --      --       --      --       --      --          --       (16,191)     (16,191)
                      ------   ----  --------  ------ --------  ------ --------  ------ -----------  -----------  -----------
BALANCE, March 31,
 1998
 (Unaudited)......       --    $--     80,307  $  803   20,000  $  200   14,711  $  147 $26,098,850  $(1,988,345) $24,111,655
                      ======   ====  ========  ====== ========  ====== ========  ====== ===========  ===========  ===========
</TABLE>
 
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-5
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                           PERIOD FROM
                          MAY 31, 1996
                          (COMMENCEMENT
                               OF       FOR THE YEAR   FOR THREE MONTHS ENDED
                          OPERATIONS),     ENDED             MARCH 31,
                           TO DECEMBER  DECEMBER 31,  -------------------------
                            31, 1996        1997         1997          1998
                          ------------- ------------  -----------  ------------
                                                            (UNAUDITED)
<S>                       <C>           <C>           <C>          <C>
CASH FLOWS FROM
 OPERATING ACTIVITIES:
  Net loss..............   $ (405,301)  $ (1,566,853) $  (389,602) $    (16,191)
  Adjustments to
   reconcile net loss to
   net cash provided by
   (used in) operating
   activities--
    Depreciation and
     amortization.......        1,150        615,817        7,337       890,871
    Deferred lease
     costs..............          --         179,481          --         89,741
    Accretion of senior
     discount notes.....          --             --           --      2,062,174
    Provision for losses
     on accounts
     receivable.........          --         469,000          --        577,000
    (Increase) decrease
     in operating assets
     and liabilities--
      Accounts
       receivable.......          --      (2,824,814)         --     (3,418,065)
      Related-party
       receivables......      (16,883)       (18,000)     (29,679)      (85,466)
      Other assets......          --         (90,559)         --       (238,072)
      Accounts payable
       and accrued
       liabilities......      268,458      1,601,911     (110,651)    3,883,263
                           ----------   ------------  -----------  ------------
        Net cash
         provided by
         (used in)
         operating
         activities.....     (152,576)    (1,634,017)    (522,595)    3,745,255
                           ----------   ------------  -----------  ------------
CASH FLOWS FROM
 INVESTING ACTIVITIES:
  Capital expenditures..      (82,303)   (11,655,524)  (2,244,385)   (7,593,061)
  Capitalized debt
   issuance costs.......          --             --           --            --
                           ----------   ------------  -----------  ------------
        Net cash used in
         investing
         activities.....      (82,303)   (11,655,524)  (2,244,385)   (7,593,061)
CASH FLOW FROM FINANCING
 ACTIVITIES:
  Net proceeds from
   issuance of long-term
   debt.................          --       3,697,500          --    144,083,351
  Payments on bank
   credit facility and
   capital leases.......          --        (216,528)        (486)   (3,533,153)
  Proceeds from Class A
   common capital
   contributions........    4,025,000      8,275,000    4,000,000    13,800,000
                           ----------   ------------  -----------  ------------
        Net cash
         provided by
         financing
         activities.....    4,025,000     11,755,972    3,999,514   154,350,198
                           ----------   ------------  -----------  ------------
NET INCREASE (DECREASE)
 IN CASH AND CASH
 EQUIVALENTS............    3,790,121     (1,533,569)   1,232,534   150,502,392
CASH AND CASH
 EQUIVALENTS, beginning
 of period..............          --       3,790,121    3,790,121     2,256,552
                           ----------   ------------  -----------  ------------
CASH AND CASH
 EQUIVALENTS, end of
 period.................   $3,790,121   $  2,256,552  $ 5,022,655  $152,758,944
                           ==========   ============  ===========  ============
</TABLE>
 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.
 
                                      F-6
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
            DECEMBER 31, 1996 AND 1997, AND MARCH 31, 1997 AND 1998
 
1. ORGANIZATION AND OPERATIONS
 
  Focal Communications Corporation began operations on May 31, 1996. Focal
Communications Corporation and Subsidiaries (the "Company") is a competitive
local exchange carrier ("CLEC") in the United States and offers a range of
telecommunications services. The Company currently has operations in Illinois
and New York. The Company competes with incumbent local exchange carriers
("ILECs") by providing high quality, local telecommunications services,
primarily over fiber optic digital networks, to meet the voice and data
transmission needs of its customers. The Company's customers are principally
telecommunications-intensive businesses, other carriers and resellers and
internet service providers.
 
  The Company incurred an accumulated deficit of $1,972,154 from May 31, 1996
(commencement of operations), through December 31, 1997. The Company must
recognize significant sales and obtain additional capital to adequately grow
its operations. Future profitability of the Company is dependent upon
continued market acceptance and the Company continuing to adequately provide
and maintain its services. Management believes that current financial
forecasts, marketing strategies and capital raising plans are adequate to
address these issues.
 
2. SIGNIFICANT ACCOUNTING POLICIES
 
 Basis of Presentation
 
  The 1996, 1997, and March 31, 1998 consolidated balance sheets include the
accounts of the Company and all wholly owned subsidiaries. All material
intercompany transactions and balances have been eliminated in consolidation.
 
 Interim Financial Information
 
  The unaudited consolidated balance sheet as of March 31, 1998, the unaudited
consolidated statement of stockholders' equity for the three months ended
March 31, 1998 and the unaudited statements of operations and cash flows for
the three months ended March 31, 1997 and 1998 include, in the opinion of
management, all adjustments (consisting of normal and recurring adjustments)
necessary to present fairly the Company's financial position, results of
operations and cash flows. Operating results for the three months ended March
31, 1998 are not necessarily indicative of the results which may be expected
for the year ended December 31, 1998. The information included in these notes
to financial statements relating to the three months ended March 31, 1998 and
1997 is unaudited.
 
 Basis of Accounting
 
  The accompanying consolidated financial statements have been prepared on the
accrual basis of accounting.
 
 Use of Estimates and Assumptions
 
  The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenues and expenses during the
reporting period. Actual results could differ from those estimates.
 
 
                                      F-7
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 Risks and Uncertainties
 
  The Company has recorded revenues and related accounts receivable totaling
$1.7 million as of December 31, 1997, and $3.2 million as of March 31, 1998
from another carrier who is currently disputing its obligation to the Company.
This dispute was ruled on in favor of the Company by the Illinois Commerce
Commission ("ICC") in March of 1998. The other carrier has appealed the ICC
ruling, and a stay of payments due was granted in federal district court
pending consideration of the appeal. A federal court ruling is expected in
June.
 
 Concentration of Suppliers
 
  The Company currently leases its transport capacity from a limited amount of
suppliers and is dependent upon the availability of fiber optic transmission
facilities owned by the suppliers. The Company is currently vulnerable to the
risk of renewing favorable supplier contracts, timeliness of the supplier in
processing the Company's orders for customers and is at risk to regulatory
agreements that govern the rates to be charged to the Company.
 
 Cash and Cash Equivalents
 
  Cash and cash equivalents (stated at cost which approximates market) consist
principally of highly liquid investments, with a maturity date of three months
or less when purchased.
 
 Revenue Recognition
 
  Revenue is recognized over the period in which the services are provided.
Monthly recurring charges include fees paid by customers for lines in service,
additional features on those lines and colocation space. These charges are
billed monthly, in advance, and are fully earned during the month. Usage
charges, initial, non-recurring charges, and reciprocal compensation charges
are billed in arrears and are fully earned when billed.
 
 Depreciation and Amortization
 
  Depreciation is provided on a straight-line basis over the estimated useful
lives of the assets as follows:
 
<TABLE>
<CAPTION>
        ASSET DESCRIPTION                            USEFUL LIFE
        -----------------                            -----------
      <S>                               <C>
      Communications network........... 3-8 years
      Computer equipment............... 3 years
      Leasehold improvements........... Shorter of asset life or life of lease
      Furniture and fixtures........... 2-5 years
</TABLE>
 
  When depreciable assets are replaced or retired, the amounts at which such
assets were carried are removed from the respective accounts and charged to
accumulated depreciation and any gains or losses on disposition is recorded
currently in the consolidated statements of operations.
 
  Maintenance and repairs are charged to expense as incurred, while major
replacements and improvements are capitalized.
 
                                      F-8
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
 Impairment of Long-Lived Assets
 
  The Company periodically assesses the recoverability of the carrying cost of
its long-lived assets based on a review of its projected undiscounted cash
flows related to the asset held for use. If assets are determined to be
impaired then the asset is written down to its fair value based on the present
value of the discounted cash flows of the related asset or other relevant
measures (quoted market prices, third party offers, etc.). Based on its
review, management does not believe that an impairment of the long-lived
assets has occurred.
 
 Capitalized Interest
 
  Interest is capitalized in connection with the construction of major
facilities and communication networks. The capitalized interest is recorded as
part of the asset to which it relates and is amortized over the asset's
estimated useful life. No interest was capitalized for the period from May 31,
1996, to December 31, 1996, and for the year ended December 31, 1997, and for
the three months ended March 31, 1998.
 
 Income Taxes
 
  The Company accounts for income taxes in accordance with Statement of
Financial Accounting Standards ("SFAS") No. 109, "Accounting for Income
Taxes," pursuant to which deferred income tax assets and liabilities are
determined based on the difference between the financial statement and tax
bases of assets and liabilities, using enacted tax rates currently in effect.
State and local taxes may be based on factors other than income.
 
 Other Noncurrent Liabilities
 
  Other noncurrent liabilities represent deferred lease incentives which
reduce lease expense ratably over future periods.
 
 Financial Instruments
 
  The carrying amounts of the Company's financial instruments at December 31,
1996 and 1997 and March 31, 1997 and 1998 approximate their fair values. The
following methods were used in estimating fair value disclosures for
significant financial instruments: (i) cash equivalents, accounts receivable,
accounts payable and accrued expenses approximate their carrying amount due to
the short duration of those instruments and (ii) long-term debt approximates
the underlying cash flows discounted at the Company's incremental borrowing
rates.
 
 Stock-Based Compensation
 
  The Company has chosen to account for stock-based compensation using the
intrinsic value method prescribed in Accounting Principles Board Opinion
("APB") No. 25, "Accounting for Stock Issued to Employees." Accordingly, no
compensation expense has been recorded for its stock option awards, but
rather, the Company has determined the pro forma net loss amount for 1997, and
the three months ended March 31, 1998 as if compensation expense had been
recorded for options granted during 1997 and the three months ended March 31,
1998 under the fair value method described in SFAS No. 123, "Accounting for
Stock-Based Compensation."
 
  The Company utilized the Black-Scholes option pricing model to estimate the
fair value of options at the date of grant during 1997 and the three months
ended March 31, 1998. Had the Company adopted SFAS No. 123, pro forma net loss
applicable to common stockholders and pro forma basic and diluted net loss per
share of common stock would have been approximately ($1,710,434) and ($17.09)
for the year ended December 31, 1997,
 
                                      F-9
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
and ($35,353) and ($0.35) for the quarter ended March 31, 1998. The pro forma
disclosure is not likely to be indicative of pro forma results which may be
expected in future years because of the fact that options vest over several
years, compensation expense is recognized as the options vest and additional
awards may also be granted.
 
 Accretion to Redemption Value of Class A Common Stock
 
  Accretion to redemption value of redeemable Class A common stock represents
the change in the redemption value of all outstanding Class A common stock
allocable to each period. The redemption values for all Class A common shares
are based on fair market value and accretion is calculated using the effective
interest method (Note 11).
 
 Loss Per Share
 
  Basic and diluted loss per share were computed in accordance with SFAS No.
128, "Earnings Per Share" (Note 7).
 
3. RELATED-PARTY RECEIVABLES
 
  As part of the stock purchase agreement (Note 10), executive shareholders,
as defined, purchased their Class A common shares with 90-day promissory
notes. The promissory notes are with recourse to each executive and have a
prepayment provision without penalty. The notes are secured by a pledge of all
Company common stock and other assets held by the executives. Interest accrues
on a daily basis at a rate equal to the applicable federal rate (5.61% at
February 13, 1998) for obligations of similar duration. On March 31, 1998
there was $120,348 due from the executive shareholders.
 
4. LONG-TERM DEBT
 
  During September, 1997, the Company entered into a credit facility with a
bank which provides for, among other things, a committed equipment line of up
to a maximum principal amount of $6,000,000. The credit facility expires on
October 30, 2002.
 
  The Company may request advances ranging from 70% to 100%, of invoice
amounts related to equipment purchases and construction of facilities, as
defined. All advances under the committed equipment line bear interest at two
percentage points above the prime rate (10.5% at December 31, 1997).
 
  All advances that are outstanding for 30 days will be payable in 48 equal
monthly installments of principal, plus all accrued interest. Advances, once
repaid, may not be reborrowed. Total advances of $3,480,972 were outstanding
as of December 31, 1997. All of the outstanding Class A, Class B and Class C
common stock have been pledged as security for the performance of all
obligations as defined in the credit facility. In February 1998 all amounts
outstanding on this credit facility were repaid and the credit facility was
terminated.
 
  In February 1998 the Company completed its offering of $270 million stated
principal amount at maturity of its 12.125% senior discount notes due 2008
(the "Notes"), which resulted in gross proceeds of $150,027,606. The Notes
bear interest at the rate of 12.125% per annum (computed on a semiannual bond
equivalent basis). In the period prior to February 15, 2003, interest will
accrue but will not be payable in cash. From February 15, 2003, interest on
the stated principal amount at maturity of the Notes will be payable in cash
semi-annually on August 15 and February 15 of each year, beginning on August
15, 2003.
 
  The Notes are senior unsecured obligations of the Company ranking pari passu
in right of payment with all other existing and future senior indebtedness of
the Company, if any, and will rank senior in right of payment to all existing
and future subordinated indebtedness of the Company, if any. Holders of
secured indebtedness of the
 
                                     F-10
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
Company, however, will have claims that are prior to the claims of the holders
of the Notes with respect to the assets securing such other indebtedness. The
Notes will be effectively subordinated to all existing and future indebtedness
and other liabilities of the Company's subsidiaries (including accounts
payable).
 
  The Notes are redeemable, at the Company's option, in whole or in part, at
any time or from time to time, on or after February 15, 2003, at 106.063% of
their stated principal amount at maturity, plus accrued and unpaid current
interest, declining ratably to 100% of their stated principal amount at
maturity, plus accrued and unpaid current interest, on or after February 15,
2006. In addition, at any time and from time to time, prior to February 15,
2001, the Company may redeem in the aggregate up to 35% of the original
aggregate stated principal amount at maturity of the Notes with the proceeds
from one or more public equity offerings following which there is a public
market, at a redemption price (expressed as a percentage of accreted value on
the redemption date) of 112.125%, plus additional interest, if any; provided
that at least 65% of the original aggregate stated principal amount at
maturity of the Notes remains outstanding after each such redemption.
 
  The Notes indenture contains certain covenants which, among other things,
restrict the ability of the Company and certain of its subsidiaries to incur
additional indebtedness (and, in the case of certain subsidiaries, issue
preferred stock), pay dividends or make distributions in respect of the
Company's or such subsidiaries' capital stock, make other restricted payments,
enter into sale and leaseback transactions, incur liens, cause encumbrances or
restrictions to exist on the ability of certain subsidiaries to pay dividends
or make distributions in respect of their capital stock, issue and sell
capital stock of certain subsidiaries, enter into transactions with
affiliates, sell assets, or amalgamate, consolidate, merge or sell or
otherwise dispose of all or substantially all of their property and assets.
These covenants are subject to exceptions and qualifications.
 
  Long-term debt at December 31, 1997 and March 31, 1998, consists of the
following:
 
<TABLE>
<CAPTION>
                                                      DECEMBER 31,  MARCH 31,
                                                          1997         1998
                                                      ------------ ------------
                                                                   (UNAUDITED)
      <S>                                             <C>          <C>
      Credit facility with bank, maximum borrowing
       level at $6,000,000...........................  $3,480,972  $        --
      12.125% senior discount notes due 2008, net of
       unamortized discount of $117,910,220..........         --    152,089,780
      Capital leases on equipment with interest at
       14.66%, $2,327 due monthly through April,
       2000..........................................      55,914         3,733
                                                       ----------  ------------
                                                        3,536,886   152,093,513
      Less--Current Maturities.......................     943,621           --
                                                       ----------  ------------
                                                       $2,593,265  $152,093,513
                                                       ==========  ============
</TABLE>
 
  Aggregate maturities of long-term debt outstanding as of December 31, 1997,
is as follows:
 
<TABLE>
      <S>                                                             <C>
      1998........................................................... $  943,621
      1999...........................................................    943,621
      2000...........................................................    937,579
      2001...........................................................    712,065
                                                                      ----------
          Total...................................................... $3,536,886
                                                                      ==========
</TABLE>
 
                                     F-11
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
5. STOCK OPTIONS
 
  The Company established the Focal Communications Corporation 1997 Non-
Qualified Stock Option Plan (the "Plan") effective February 27, 1997. The Plan
is administered by the Company's Board of Directors (the "Board"). The Board
has sole and complete authority to select participants and grant options for
the Company's Class A common shares which shall not exceed 5,260 shares, as
defined. During 1997, and the three months ended March 31, 1998 stock options
were granted to employees and a director with exercise prices approximating
the fair market value of the shares on the date of grant and, accordingly, no
compensation expense has been recognized in connection with the options.
 
  The Plan gives the Board complete discretion in determining vesting periods
and terms of each participant's options granted. All options granted to
employees and to a director during 1997 and the three months ended March 31,
1998 provide vesting ranging from three to four years. Vesting occurs at 10%
immediately for one participant, 25% on the first-year anniversary from grant
date for all remaining participants and vesting at 12.5% to 15% every six
months for the remainder of vesting years. The term of each option is 10
years. In addition, the Plan provides for accelerated vesting upon certain
events, as defined.
 
  The following summarizes option activity:
 
<TABLE>
<CAPTION>
                                                                      WEIGHTED
                                                  SHARES OF           AVERAGE
                                                   CLASS A  EXERCISE  EXERCISE
                                                   COMMON    PRICES    PRICES
                                                  --------- --------- --------
      <S>                                         <C>       <C>       <C>
      Outstanding at December 31, 1996...........     --    $     --  $   --
        Granted during 1997......................   1,222   $290-$320 $296.61
                                                    -----   --------- -------
      Outstanding at December 31, 1997...........   1,222   $290-$320 $296.61
                                                    =====   ========= =======
        Granted during the three months ended
         March 31, 1998..........................     627   $     335 $335.00
                                                    -----   --------- -------
      Outstanding at March 31, 1998..............   1,849   $290-$335 $309.63
                                                    =====   ========= =======
</TABLE>
 
  The fair value of each option was estimated on the date of grant based on
the Black-Scholes option pricing model assuming, among other things, no
dividend yield, a risk-free interest rate ranging from 6.0% to 6.66%, expected
volatility of 41.67% and expected life of five years.
 
  The Black-Scholes option model estimated the weighted average fair value at
the date of grant of options granted in 1997 and for the three months ended
March 31, 1998 to be $161 per option as of March 31, 1998. The remaining
contractual life of all options was approximately 10 years.
 
                                     F-12
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
6. INCOME TAXES
 
  There is no current or deferred tax expense for the period from May 31,
1996, to December 31, 1996, for the year ended December 31, 1997, and for the
three months ended March 31, 1998. The deferred tax consequences of temporary
differences in reporting items for financial statement and income tax purposes
are recognized, if appropriate. Realization of future tax benefits related to
the deferred tax assets is dependent on many factors, including the Company's
ability to generate taxable income. Management has considered these factors
and has concluded that a full valuation allowance for financial reporting
purposes is required for the deferred tax assets. The income tax effect of
temporary differences comprising the net deferred tax asset is a result of the
following:
 
<TABLE>
<CAPTION>
                                                             1996      1997
                                                           --------  ---------
      <S>                                                  <C>       <C>
      Deferred income tax liabilities--Depreciation......  $    --   $(227,000)
                                                           --------  ---------
      Deferred income tax assets--Assets recorded for tax
       purposes..........................................       --     205,000
      Net operating losses...............................    76,000    724,000
                                                           --------  ---------
                                                             76,000    929,000
                                                           --------  ---------
      Less--Valuation allowance..........................   (76,000)  (702,000)
                                                           --------  ---------
      Net deferred tax assets............................  $    --   $     --
                                                           ========  =========
</TABLE>
 
  The Company has net operating loss carryforwards as of December 31, 1997 of
approximately $1,811,000 for tax purposes to offset future taxable income. The
operating loss carryforwards expire principally in 2012.
 
7. LOSS PER SHARE
 
  SFAS No. 128, "Earnings Per Share," requires the Company to calculate its
earnings per share based on basic and diluted earnings per share, as defined.
Basic and diluted loss per share for the period from May 31, 1996, to December
31, 1996, for the year ended December 31, 1997, and for the three months ended
March 31, 1998 was computed by dividing net loss applicable to common
stockholders by the weighted average number of shares of common stock (Class A
and Class B common stock).
 
<TABLE>
<CAPTION>
                                 DECEMBER 31, DECEMBER 31, MARCH 31, MARCH 31,
                                     1996         1997       1997      1998
                                 ------------ ------------ --------- ---------
      <S>                        <C>          <C>          <C>       <C>
      Basic Weighted Average
       Number of Common Shares
       Outstanding..............    32,625      100,093     99,461    100,307
      Dilutive Stock Options....       --           --         --       1,304
                                    ------      -------     ------    -------
      Dilutive Weighted Average
       Number of Common Shares
       Outstanding..............    32,625      100,093     99,461    101,611
                                    ======      =======     ======    =======
</TABLE>
 
  The 14,711 Class C common shares and the Company's 1,849 unvested stock
options granted during 1997 and the three months ended March 31, 1998, are
antidilutive and have been excluded from diluted loss per share calculation
for the year ended December 31, 1997 and the three months ended March 31,
1998.
 
8. EMPLOYEE BENEFIT PLAN
 
  The Company has a 401(k) Plan (the "Plan") covering substantially all
eligible employees. Under the Plan, participants may make pretax contributions
from 1% to 15% of eligible earnings, as defined. The Company may elect to
contribute to the Plan at its discretion. There have been no Company
contributions to the Plan for the years ended December 31, 1996 and 1997. In
February 1998 the company elected to match 30% of the first 10% that an
employee contributes to the plan.
 
                                     F-13
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
 
9. COMMITMENTS AND CONTINGENCIES
 
  Under the terms of various short- and long-term contracts, the Company is
obligated to pay office rents and rent for leasing fiber optic transmission
facilities. The Company is obligated to pay office rents in connection with
its operations through 2012. The office rent contracts provide for certain
scheduled increases and for possible escalation of basic rentals based on a
change in the cost of living or on other factors. The Company expects to enter
into other contracts for additional office space, other facilities, equipment
and maintenance services in the future.
 
  A summary of such fixed commitments at December 31, 1997, is as follows:
 
<TABLE>
<CAPTION>
      YEAR                                                              AMOUNT
      ----                                                            ----------
      <S>                                                             <C>
      1998........................................................... $  575,000
      1999...........................................................    584,000
      2000...........................................................    595,000
      2001...........................................................    475,000
      2002...........................................................    500,000
      Thereafter.....................................................  4,784,000
                                                                      ----------
        Total........................................................ $7,513,000
                                                                      ==========
</TABLE>
 
  Rent expense under operating leases for office rent and rent for leasing
fiber optic transmission facilities was approximately $6,488 for the period
from May 31, 1996, to December 31, 1996, and $651,159 for the year ended
December 31, 1997, and $166,484 for the three months ended March 31, 1998.
 
  In the ordinary course of business, the Company is involved in various
regulatory matters (Note 2), proceedings and claims.
 
10. STOCK PURCHASE AGREEMENT
 
  On November 27, 1996, the Company entered into a Stock Purchase Agreement
(the "Agreement") with Institutional Investors and Executives ("Investors"),
as defined in the Agreement. The Agreement resulted in 79,384 shares of Class
A Common Stock, par value $.01 per share being issued for an aggregate
purchase price of $4 million, and subsequent transactions in which Investors
will make pro-rata contributions to the capital of the Company (with no
additional shares being issued) of up to an additional $21.8 million (total
investment of up to $25.8 million). Total capital contributions to the Company
for the issuance of Class A common were $4,025,000 and $8,275,000 for the
period from May 31, 1996, to December 31, 1996, and for the year ended
December 31, 1997, respectively.
 
  Subsequent to the closing of the Agreement, the Company sold 77 shares and
846 shares of Class A Common shares to Designees (as defined in the Agreement)
of the Institutional Investors, for a total purchase price of $25,000 and
$275,000 for the period from May 31, 1996, to December 31, 1996, and for the
year ended December 31, 1997, respectively.
 
  As part of the Agreement, the Company and Executives' existing common stock
held by the executives converted into newly issued Class B common and Class C
common shares (the "Exchange"). The closing of the Exchange and issuance of
Class B common and Class C common shares took place simultaneously with the
initial closing of the issuance of Class A common shares under the Agreement.
A summary of the Company's Class A, B and C common stock is as follows:
 
    Class A Common--A total of 85,567 shares have been authorized and 79,461
  and 80,307 are issued and outstanding as of December 31, 1996 and 1997,
  respectively. Institutional Investors, as defined, who
 
                                     F-14
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  hold Class A common shares have the right to put the shares to the Company
  at fair market value (Notes 11 and 14). Once the put right is exercised by
  the Institutional Investors, the Executive Investors and Designees of the
  Institutional Investors have the right to participate in the put option as
  to all, but not less than all, of the shares of Class A common owned by
  them and pursuant to the Agreement. The Class A common held by
  Institutional Investors have demand registration rights, all Class A common
  stockholders have voting rights, piggyback registration rights, participate
  in earnings and dividends and other preference features, as defined.
 
    Class B Common--A total of 35,000 shares have been authorized and 20,000
  shares are issued and outstanding as of December 31, 1996 and 1997. Class B
  common stockholders have voting rights, piggyback registration rights,
  participate in earnings and dividends and other preference features, as
  defined. The Executive Stock Agreement ("ESA") provides vesting for Class B
  common of 20% at the closing of the Agreement and an additional 20% on each
  of the four anniversaries of the closing date of the Agreement. The ESA
  also provides for vesting acceleration upon the occurrence of certain
  events (as defined): (a) qualified sale of the Company; (b) qualified
  reorganization; and (c) public offering of the Company's stock.
 
    Class C Common--A total of 15,000 shares have been authorized and 14,711
  shares are issued and outstanding as of December 31, 1996 and 1997. Class C
  common stockholders have voting rights in which the executives have named
  the Institutional Investors as their proxies to vote all unvested Class C
  common shares. The ESA and other vesting agreements, under the Agreement,
  provide vesting of the Class C common shares. Under the vesting agreements,
  the Class C common shares vest, based upon certain triggering events (as
  defined), including: (a) qualified sale of the Company; (b) qualified
  liquidation of the Company; and (c) public offering of the Company's stock.
  The Class C common shares will be automatically forfeited on November 27,
  2003 if a triggering event does not occur. Once a triggering event takes
  place the vesting of Class C common shares will also be subject to vesting
  under the ESA which provides vesting at 20% at the closing of the agreement
  and an additional 20% on each of the four anniversaries of the closing date
  (November 27, 1996). Pursuant to the vesting agreements, upon the vesting
  of any shares of Class C common an equal number of shares of Class A common
  held by the Institutional Investors will be forfeited. At the time of a
  triggering event the Company will be subject to a compensation charge equal
  to the value transferred to the Class C common stockholders.
 
11. REDEEMABLE COMMON STOCK
 
  As defined in the Agreement (Note 10), Institutional Investors which hold an
aggregate of 78,461 shares of Class A common shares have the right to put the
shares to the Company on or after November 27, 2003, at the greater of the
initial purchase price per share of Class A common owned by the Institutional
Investors or fair market value, as defined in the Agreement. Once the put
right is exercised by the Institutional Investors, the Executive Investors and
Designees of the Institutional Investors have the right to participate in the
put option as to all, but not less than all, of the shares of Class A common
owned by them and pursuant to the Agreement. This put right automatically
terminates upon the closing of an initial public offering, as defined. The
Company records accretion each quarter to the expected redemption value at
November 27, 2003, based on the effective interest method.
 
  Although management has not obtained an appraisal of the fair market value
of the Company, certain public equity transactions have occurred within the
industry upon which management has based its estimate on the potential
redemption value of the aforementioned shares to be $333 and $325 per share as
of December 31, 1997 and 1996, respectively. The Company recorded accretion
totaling $103,565 and $0 for the year ended December 31, 1997, and for the
period from May 31, 1996, to December 31, 1996, respectively.
 
  During January 1998, the Agreement was amended and the aforementioned put
right was replaced by a provision which would allow the Class A common
Institutional Investors, Executive Investors, and Designees of
 
                                     F-15
<PAGE>
 
               FOCAL COMMUNICATIONS CORPORATION AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONCLUDED)
 
Institutional Investors, as defined, to require the Company to voluntarily
liquidate. The Institutional Investors at any time and from time to time on or
after November 27, 2003, but not after the consummation of a public offering,
shall have the right to require the Company to voluntarily liquidate the
assets of the Company. Upon receipt of notice of the required liquidation, the
Company may elect to purchase all but not less than all of the Institutional
Investors' Class A common shares.
 
12. SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
 
  Cash paid for interest and noncash investing and financing activities for
the year ended December 31, 1997, and for the three months ended March 31,
1998, was as follows:
 
<TABLE>
<CAPTION>
                                                    FOR THE YEAR FOR THE THREE
                                                       ENDED     MONTHS ENDED
                                                    DECEMBER 31,   MARCH 31,
                                                        1997         1998
                                                    ------------ -------------
                                                                  (UNAUDITED)
      <S>                                           <C>          <C>
      Cash paid during the year for interest.......   $ 94,533      $69,079
                                                      ========      =======
      Fixed assets acquired under capital leases...   $ 68,589      $   --
                                                      ========      =======
      Payments made under capital leases...........   $ 12,675      $51,908
                                                      ========      =======
      Accretion to redemption value of Class A
       common stock................................   $103,565      $   --
                                                      ========      =======
</TABLE>
 
13. SELECTED CONSOLIDATED QUARTERLY INFORMATION (UNAUDITED)
 
<TABLE>
<CAPTION>
                             1ST QUARTER  2ND QUARTER 3RD QUARTER  4TH QUARTER
                             -----------  ----------- -----------  -----------
<S>                          <C>          <C>         <C>          <C>
1996 (for period from May
 31, 1996 (commencement of
 operations), to December
 31, 1996)--
  Revenues.................. $      --     $     --   $      --    $      --
  Loss from operations......        --           --      (21,650)    (401,277)
  Net loss applicable to
   common stockholders......        --           --      (21,650)    (383,651)
                                                                   ==========
  Basic and diluted net loss
   per share................ $      --     $     --   $    (1.08)  $    (7.77)
                             ==========    =========  ==========   ==========
1997--
  Revenues.................. $      --     $  86,907  $1,226,076   $2,710,707
  Income (loss) from
   operations...............   (432,526)    (820,686)   (461,382)      80,115
  Net income (loss)
   applicable to common
   stockholders.............   (415,492)    (794,257)   (466,446)       5,777
  Basic and diluted net
   income (loss) per share.. $    (4.18)   $   (7.92) $    (4.65)  $      .06
                             ==========    =========  ==========   ==========
1998--
  Revenues.................. $5,102,448
  Income (loss) from
   operations...............  1,077,059
  Net income (loss)
   applicable to common
   stockholders.............    (16,191)
  Basic and diluted net loss
   per share................ $    (0.16)
                             ==========
</TABLE>
 
                                     F-16
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFOR-
MATION OR TO MAKE ANY REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PRO-
SPECTUS IN CONNECTION WITH THE OFFER MADE HEREBY, AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHO-
RIZED BY THE COMPANY. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE
MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT
THERE HAS BEEN NO CHANGE IN THE INFORMATION SET FORTH HEREIN OR IN THE AFFAIRS
OF THE COMPANY SINCE THE DATE AS OF WHICH INFORMATION IS GIVEN IN THIS PRO-
SPECTUS. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANY-
ONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED
OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO
DO SO OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITA-
TION.
 
                               ----------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
Prospectus Summary.......................................................   1
Risk Factors.............................................................  11
The Exchange Offer.......................................................  21
Use of Proceeds..........................................................  29
Capitalization...........................................................  29
Selected Consolidated Financial and Operating Data.......................  30
Management's Discussion and Analysis of Financial Condition and Results
 of Operations...........................................................  32
Business.................................................................  36
Management...............................................................  48
Security Ownership of Certain Beneficial Owners and Management...........  55
Certain Transactions.....................................................  57
Description of Capital Stock.............................................  57
Description of the Exchange Notes........................................  62
Plan of Distribution.....................................................  92
Certain United States Federal Income Tax Considerations..................  93
Legal Matters............................................................  98
Independent Public Accountants...........................................  98
Available Information....................................................  98
Index to Consolidated Financial Statements............................... F-1
</TABLE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                                 $270,000,000
 
                       FOCAL COMMUNICATIONS CORPORATION
 
OFFER TO EXCHANGE ITS 12.125% SENIOR DISCOUNT NOTES DUE 2008, SERIES B FOR ANY
       AND ALL OF ITS OUTSTANDING 12.125% SENIOR DISCOUNT NOTES DUE 2008
 
                                     LOGO
 
                               ----------------
 
                                  PROSPECTUS
                              DATED        , 1998
 
                               ----------------
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Delaware General Corporation Law. The Company has statutory authority to
indemnify the officers and directors. The applicable provisions of the DGCL
state that, to the extent such person is successful on the merits or
otherwise, a corporation may indemnify any person who was or is a party or who
is threatened to be made a party to any threatened, pending or completed
action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership,
joint venture, trust or other enterprise ("such Person"), against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement,
actually and reasonably incurred by such Person, if he acted in good faith and
in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation and with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful. In
any threatened, pending or completed action by or in the right of the
corporation, a corporation also may indemnify any such Person for costs
actually and reasonably incurred by him in connection with that action's
defense or settlement, if he acted in good faith and in a manner he reasonably
believed to be in or not opposed to the best interests of the corporation;
however, no indemnification shall be made with respect to any claim, issue or
matter as to which such Person shall have been adjudged to be liable to the
corporation, unless and only to the extent that a court shall determine that
such indemnity is proper.
 
  Under the applicable provisions of the DGCL, any indemnification shall be
made by the corporation only as authorized in the specific case upon a
determination that the indemnification of the director, officer, employee or
agent is proper in the circumstances because he has met the applicable
standard of conduct. Such determination shall be made:
 
    (1) By the Board of Directors by a majority vote of a quorum consisting
  of directors who are not parties to such action, suit or proceeding; or
 
    (2) If such a quorum is not obtainable or, even if obtainable, a quorum
  of disinterested directors so directs, by independent legal counsel in a
  written opinion; or
 
    (3) By the affirmative vote of a majority of the shares entitled to vote
  thereon.
 
  The Company's Certificate of Incorporation provides for indemnification to
the full extent permitted by the laws of the State of Delaware against and
with respect to threatened, pending or completed actions, suits or proceedings
arising from or alleged to arise from, a party's actions or omissions as a
director, officer, employee or agent of the Company or of any subsidiary of
the Company or of any other corporation, partnership, joint venture, trust or
other enterprise which he has served in such capacity at the request of the
Company if such acts or omissions occurred or were or are alleged to have
occurred, while said party was a director or officer of the Company.
 
                                     II-1
<PAGE>
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
 (A) Exhibits
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER                            EXHIBIT DESCRIPTION
 -------                           -------------------
 <C>     <S>
   1.1   Purchase Agreement with Salomon Brothers Inc, Morgan Stanley & Co.
         Incorporated, and NationsBanc Montgomery Securities LLC, dated
         February 12, 1998.+
   2.1   Plan of Reorganization and Agreement by and among Focal Communications
         Corporation and its Subsidiaries, dated June 12, 1997.+
   3.1   Certificate of Incorporation+
   3.2   By-Laws+
   4.1   Indenture with Harris Trust and Savings Bank, dated February 18,
         1998.+
   4.2   Initial Global 12.125% Senior Discount Note Due February 15, 2008,
         dated February 18, 1998.+
   4.3   Exchange and Registration Agreement with Salomon Brothers Inc, Morgan
         Stanley & Co. Incorporated, and NationsBanc Montgomery Securities LLC,
         dated February 18, 1998.+
   4.4   Form of Exchange Agent Agreement with Harris Trust and Savings Bank,
         dated    , 1998.+
   4.5   Stock Purchase Agreement with Madison Dearborn Capital Partners, L.P.,
         Frontenac VI, L.P., Battery Ventures III, L.P., Brian F. Addy, John R.
         Barnicle, Joseph Beatty, and Robert C. Taylor Jr., dated November 27,
         1996.
   4.6   Amendment to Stock Purchase Agreement with Madison Dearborn Capital
         Partners, L.P., Frontenac VI, L.P., Battery Ventures III, L.P., Brian
         F. Addy, John R. Barnicle, Joseph Beatty, and Robert C. Taylor Jr.,
         dated January 23, 1998.+
   4.7   Executive Investor Stock Pledge Agreement with Brian F. Addy, dated
         November 27, 1996.+
   4.8   Executive Investor Stock Pledge Agreement with John R. Barnicle, dated
         November 27, 1996.+
   4.9   Executive Investor Stock Pledge Agreement with Joseph A. Beatty, dated
         November 27, 1996.+
   4.10  Executive Investor Stock Pledge Agreement with Robert C. Taylor, Jr.,
         dated November 27, 1996.+
   4.11  Stockholders Agreement with Madison Dearborn Capital Partners, L.P.,
         Frontenac VI, L.P., Battery Ventures III, L.P., Brian F. Addy, John R.
         Barnicle, Joseph Beatty, and Robert C. Taylor Jr., dated November 27,
         1996.+
   4.12  Executive Stock Agreement and Employment Agreement with Brian F. Addy,
         dated November 27, 1996.+
   4.13  Executive Stock Agreement and Employment Agreement with John R.
         Barnicle, dated November 27, 1996.+
   4.14  Executive Stock Agreement and Employment Agreement with Joseph A.
         Beatty, dated November 27, 1996.+
   4.15  Executive Stock Agreement and Employment Agreement with Robert C.
         Taylor, Jr., dated November 27, 1996.+
   4.16  Registration Agreement with Madison Dearborn Capital Partners, L.P.,
         Frontenac VI, L.P., Battery Ventures III, L.P., Brian F. Addy, John R.
         Barnicle, Joseph Beatty, and Robert C. Taylor Jr., dated November 27,
         1996.+
   5.1   Opinion of Ross & Hardies+
   8.1   Tax Opinion of Ross & Hardies+
  10.1   Interconnection Agreement with Ameritech Information Industry
         Services, dated October 28, 1996.+
  10.2   Interconnection Agreement with Ameritech Information Industry
         Services, dated October 24, 1997.+
  10.3   Interconnection Agreement with New York Telephone Company, dated
         November 10, 1997.+
</TABLE>    
 
 
                                      II-2
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
 NUMBER                            EXHIBIT DESCRIPTION
 -------                           -------------------
 <C>     <S>
  10.4   Amended and Restated Interconnection Agreement with Ameritech
         Information Industry Services, dated March 16, 1998.+
  10.5   Network Products Purchase Agreement with Northern Telecom Inc., dated
         January 21, 1997.*
  10.6   Amendments No. 1 and No. 2 to Network Products Purchase Agreement with
         Northern Telecom Inc., both dated March 6, 1998.*
  10.7   Lease Agreement for property located at 200 North LaSalle, Chicago,
         IL, dated December 31, 1996.+
  10.8   First Amendment to Lease Agreement for property located at 200 North
         LaSalle, Chicago, IL, dated May 14, 1997.+
  10.9   Second Amendment to Lease Agreement for property located at 200 North
         LaSalle, Chicago, IL, dated November 15, 1997.+
  10.10  Third Amendment to Lease Agreement for property located at 200 North
         LaSalle, Chicago, IL, dated March 2, 1998.+
  10.11  Lease Agreement for property located at 32 Old Slip, New York, NY,
         dated May 20, 1997.+
  10.12  Lease Agreement for property located at 650 Townsend Street, San
         Francisco, CA, dated January 26, 1998.+
  10.13  Lease Agreement for property located at 701 Market Street,
         Philadelphia, Pennsylvania, dated March 10, 1998.+
  10.14  1997 Non-Qualified Stock Option Plan, adopted February 27, 1997.+
  10.15  Form of Stock Option Agreement+
  10.16  Employment Agreement with Renee M. Martin, dated March 20, 1998+
  10.17  Software License with DPI/TFS, Inc., dated April 10, 1997*
  10.18  Fourth Amendment to Lease Agreement for property located at 200 North
         LaSalle, Chicago, IL, dated April 4, 1998.+
  10.19  Lease Agreement for property located at 1120 Vermont Avenue, N.W.,
         Washington, D.C., dated as of May 4, 1998.+
  10.20  Lease Agreement for property located at 1200 West Seventh Street, Los
         Angeles, California, dated as of May 19, 1998.+
  10.21  Executive Employment Agreement with Andrew K. Robitshek, dated July
         15, 1998.
  10.22  Interconnection Agreement with Pacific Bell, dated June 15, 1998.++
  10.23  Interconnection Agreement with GTE-California, dated June 12, 1998.++
  12.1   Statement re Computation of Ratios+
  21.1   Subsidiaries of the Registrant+
  23.1   Consent of Arthur Andersen LLP
         Consent of Ross & Hardies (included as part of its opinions filed as
  23.2   Exhibits 5.1 and 8.1 hereto)+
  24.1   Powers of Attorney (included on signature pages hereof)+
  25.1   Statement of Eligibility of Trustee+
  99.1   Form of Letter of Transmittal+
  99.2   Form of Notice of Guaranteed Delivery+
</TABLE>    
- --------
+  Previously Filed.
   
++ To be filed by Amendment.     
   
*  Certain portions of these Exhibits have been omitted pursuant to a request
   for confidential treatment and the omitted portions have been separately
   filed with the Commission.     
 
 (B) Financial Statement Schedules.
 
  Schedules not listed have been omitted because they are inapplicable or the
information required to be set forth therein is provided in the Consolidated
Financial Statements of the Company or notes thereto.
 
                                     II-3
<PAGE>
 
ITEM 22. UNDERTAKINGS
 
  Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, office or controlling person in
connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
  The undersigned registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Items 4, 10(b), 11 or 13 of this Form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of this Registration Statement through
the date of responding to the request.
 
  The undersigned registrant hereby undertakes to supply by means of a post-
effective amendment all information concerning a transaction, and the company
being acquired involved therein, that was not the subject of and included in
this Registration Statement when it became effective.
 
  The undersigned registrant hereby undertakes that for purposes of
determining any liability under the Securities Act, the information omitted
from the form of prospectus filed as part of this Registration Statement in
reliance upon Rule 430A and contained in a form of prospectus filed by the
registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities
Act shall be deemed to be part of this Registration Statement as of the time
it was declared effective.
 
  The undersigned registrant hereby undertakes that for the purpose of
determining any liability under the Securities Act, each post-effective
amendment that contains a form of prospectus shall be deemed to be a new
registration statement related to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
  The undersigned registrant hereby undertakes to file, during any period in
which offers or sales are being made, a post-effective amendment to this
Registration Statement;
 
    (i) to include any prospectus required by section 10(a)(3) of the
  Securities Act of 1933 (the "Securities Act");
 
    (ii) to reflect in the prospectus any facts or events arising after the
  effective date of this Registration Statement (or the most recent post-
  effective amendment hereof) which, individually or in the aggregate,
  represents a fundamental change in the information set forth in this
  Registration Statement. Notwithstanding the foregoing, any increase or
  decrease in volume of securities offered (if the total dollar value of
  securities offered would not exceed that which was registered) and any
  deviation from the low or high end of the estimated maximum offering range
  may be reflected in the form of prospectus filed with the Securities and
  Exchange Commission pursuant to rule 424(b) if, in the aggregate, the
  changes in volume and price represent no more than a 20% change in the
  maximum aggregate offering price set forth in the "Calculation of
  Registration Fee" table in this Registration Statement when it becomes
  effective; and
 
    (iii) to include any material information with respect to the plan of
  distribution not previously disclosed in this Registration Statement or any
  material change to such information in this Registration Statement.
 
  The undersigned registrant hereby undertakes to remove from registration by
means of a post-effective amendment any of the securities being registered
which remain unsold at the termination of the offering.
 
                                     II-4
<PAGE>
 
                                  SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this Amendment No. 3 to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in the
City of Chicago, State of Illinois, on       , 1998.     
 
                                          Focal Communications Corporation
 
                                                 /s/ Robert C. Taylor, Jr.
                                          By: _________________________________
                                                  ROBERT C. TAYLOR, JR.
                                              PRESIDENT AND CHIEF EXECUTIVE
                                                         OFFICER
 
                               POWER OF ATTORNEY
 
  Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on       , 1998.
 
              SIGNATURE                               TITLE(S)
 
      /s/ Robert C. Taylor, Jr.        President, Chief Executive Officer and
- -------------------------------------   Director
        ROBERT C. TAYLOR, JR.
 
        /s/ John R. Barnicle*          Executive Vice President, Chief
- -------------------------------------   Operating Officer, Assistant
          JOHN R. BARNICLE              Secretary, and Director
 
        /s/ Joseph A. Beatty           Executive Vice President, Principal
- -------------------------------------   Financial Officer, Treasurer and
          JOSEPH A. BEATTY              Assistant Secretary
 
       /s/ Robert M. Junkroski         Controller (Principal Accounting
- -------------------------------------   Officer)
         ROBERT M. JUNKROSKI
 
     /s/ James E. Crawford, III*       Director
- -------------------------------------
       JAMES E. CRAWFORD, III
 
        /s/ Paul T. Finnegan*          Director
- -------------------------------------
          PAUL T. FINNEGAN
 
       /s/ Richard D. Frisbie*         Director
- -------------------------------------
         RICHARD D. FRISBIE
 
         /s/ James N. Perry*           Director
- -------------------------------------
         JAMES N. PERRY, JR.
 
        /s/ Paul G. Yovovich*          Director
- -------------------------------------
          PAUL G. YOVOVICH
*Signed by Joseph A. Beatty pursuant to power of attorney
 
                                     II-5

<PAGE>
 
                                  Exhibit 4.5



                            STOCK PURCHASE AGREEMENT


                                  BY AND AMONG


                        FOCAL COMMUNICATIONS CORPORATION


                                      AND


                    MADISON DEARBORN CAPITAL PARTNERS, L.P.


                               FRONTENAC VI, L.P.


                           BATTERY VENTURES III, L.P.


                                 BRIAN F. ADDY


                                JOHN R. BARNICLE


                                 JOSEPH BEATTY


                             ROBERT C. TAYLOR, JR.



                               NOVEMBER 27, 1996

                                       i
<PAGE>
 
                               TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                           Page
<S>                                                                        <C>
1.   Authorization and Closings...........................................    2
     1A.    Authorization of the Class A Common...........................    2
     1B.    Purchase and Sale of the Class A Common.......................    2
     1C.    The Initial Closing...........................................    2
     1D.    The Subsequent Closings.......................................    3
                                                                           
2.   Conditions to the Initial Closing....................................    4
     2A.    Representations and Warranties; Covenants.....................    4
     2B.    Amendment of Certificate of Incorporation.....................    4
     2C.    Amendment of the Company's Bylaws.............................    4
     2D.    Stockholders Agreement........................................    4
     2E.    Executive Stock Agreements....................................    4
     2F.    Registration Agreement........................................    4
     2G.    Vesting Agreements............................................    4
     2H.    Interconnection Agreement and Achievement of Common Carrier    
             Status.......................................................    4
     2I.    Sale of Class A Common to Each Investor.......................    5
     2J.    Securities Law Compliance.....................................    5
     2K.    Opinion of the Company's Counsel..............................    5
     2L.    Proceedings...................................................    5
     2M.    Expenses......................................................    5
     2N.    Compliance with Applicable Laws...............................    5
     2O.    Initial Closing Documents.....................................    6
     2P.    Waiver........................................................    6
                                                                           
3.  Conditions to Each Subsequent Closing.................................    6
     3A.    Authorized by Initial and/or Subsequent Business Plan(s)......    7
     3B.    Representations and Warranties................................    7
     3C.    No Default....................................................    7
     3D.    No Material Adverse Change....................................    7
     3E.    Proceedings...................................................    8
     3F.    Opinion of the Company's Counsel..............................    8
     3G.    Expenses......................................................    8
     3H.    Subsequent Closing Documents..................................    8
     3I.    Waiver........................................................    8
                                                                           
4.  Covenants.............................................................    9
     4A.    Financial Statements and Other Information....................    9
     4B.    Inspection of Property........................................   11
     4C.    Restrictions..................................................   12
     4D.    Affirmative Covenants.........................................   15
     4E.    Compliance with Agreements....................................   16
     4F.    Current Public Information....................................   16
</TABLE>

                                      -i-
<PAGE>
 
<TABLE>
<S>                                                                        <C>
     4G.    Amendment of Vesting Agreements or Executive Stock
             Agreements...................................................   16
     4H.    Intellectual Property Rights..................................   16
     4I.    Public Disclosures............................................   16
     4J.    First Refusal Rights..........................................   17

5.   Investors' Put Right.................................................   18
     5A.    Put Right.....................................................   18
     5B.    Company Obligation............................................   18
     5C.    Repurchase Price..............................................   18
     5D.    Repurchase Closing............................................   19

6.   Transfer of Restricted Securities....................................   19
     6A.    General Provisions............................................   19
     6B.    Opinion Delivery..............................................   19
     6C.    Rule 144A.....................................................   19
     6D.    Legend Removal................................................   20

7.   Representations and Warranties of the Company........................   20
     7A.    Organization, Corporate Power and Licenses....................   20
     7B.    Capital Stock and Related Matters.............................   20
     7C.    Authorization; No Breach......................................   21
     7D.    Conduct of Business; Absence of Liabilities...................   21
     7E.    Assets........................................................   21
     7F.    No Subsidiaries...............................................   21
     7G.    Contracts and Commitments.....................................   21
     7H.    Intellectual Property Rights..................................   22
     7I.    Litigation, etc...............................................   22
     7J.    Brokerage.....................................................   23
     7K.    Governmental Consent, etc.....................................   23
     7L.    Compliance with Laws..........................................   23
     7M.    Affiliated Transactions.......................................   23
     7N.    Projections and Pro Forma Financial Statements................   23
     7O.    Disclosure....................................................   24

Section 8.  Representations and Warranties of the Institutional
             Investors....................................................   24
     8A.    Assets........................................................   24
     8B.    Initial Business Plan.........................................   24
     8C.    Authorization.................................................   24

9.  Miscellaneous Provisions..............................................   25
     9A.    Expenses......................................................   25
     9B.    Remedies......................................................   25
</TABLE>

                                     -ii-
<PAGE>
 
<TABLE>
<S>                                                                          <C>
     9C.    Investor's Investment Representations.........................   26
     9D.    Consent to Amendments.........................................   26
     9E.    Survival of Representations and Warranties....................   26
     9F.    Successors and Assigns........................................   26
     9G.    Capital and Surplus; Special Reserves.........................   27
     9H.    Severability..................................................   27
     9I.    Counterparts..................................................   27
     9J.    Descriptive Headings; Interpretation..........................   27
     9K.    Governing Law.................................................   27
     9L.    Notices.......................................................   28
     9M.    Understanding among the Investors.............................   28
     9N.    No Strict Construction........................................   28
</TABLE>

Appendix A - Index of Definitions
Appendix B - Schedule of Investors
Appendix C - Original Offering Memorandum

Exhibits:
 
     Exhibit 1 - The Initial Business Plan

     Exhibit 2 - Restated Certificate of Incorporation

     Exhibit 3 - Form of Executive Note

     Exhibit 4 - Form of Executive Investor Stock Pledge Agreement

     Exhibit 5 - Bylaws Amendment

     Exhibit 6 - Stockholders Agreement

     Exhibit 7 - Form of Executive Stock Agreement and Employment Agreement

     Exhibit 8 - Registration Agreement

     Exhibit 9 - Form of Vesting Agreement

     Exhibit 10 - Interconnection Agreement

     Exhibit 11 - Opinion of Bischoff, Kenney & Niehaus (Initial Closing)

     Exhibit 12 - Opinion of Bischoff, Kenney & Niehaus (Subsequent Closings)

     Exhibit 13 - Form of Nondisclosure and Noncompetition Agreement

                                     -iii-
<PAGE>
 
Disclosure Schedules

     Licenses Schedule
     Capitalization Schedule
     Liabilities Schedule
     Assets Schedule
     Contracts Schedule
     Intellectual Property Schedule
     Litigation Schedule
     Consents Schedule
     Affiliated Transactions Schedule

                                     -iv-
<PAGE>
 
                            STOCK PURCHASE AGREEMENT
                            ------------------------


          THIS STOCK PURCHASE AGREEMENT (the "Agreement") is made as of November
                                              ---------
27, 1996, by and among Focal Communications Corporation, a Delaware corporation
(the "Company"), Madison Dearborn Capital Partners, L.P., a Delaware limited
      -------
partnership ("MDCP"), Frontenac VI, L.P., a Delaware limited partnership
              ----
("Frontenac"), Battery Ventures III, L.P., a Delaware limited partnership ("BV",
  ---------                                                                 --
and collectively with MDCP and Frontenac, the "Institutional Investors"), and
                                               -----------------------
Robert C. Taylor, Jr. ("Taylor"), John R. Barnicle ("Barnicle"), Brian F. Addy
                        ------                       --------
("Addy") and Joseph Beatty ("Beatty", and, collectively with Taylor, Barnicle
  ----                       ------
and Addy, the "Executive Investors").  The Institutional Investors and the
               -------------------
Executive Investors are referred to herein collectively as the "Investors" and
                                                                ---------
individually as an "Investor."  Capitalized terms used herein are defined in the
                    --------
Index of Definitions attached hereto as Appendix A, which is hereby made a part
                                        ----------
of this Agreement.

          The Company has submitted a business plan in form and substance set
forth in Exhibit 1 attached hereto (the "Initial Business Plan"), which
         ---------                       --------------------- 
contains, among other information, a financial model, with underlying
assumptions, containing a plan to establish the Company's business in the
Chicago metropolitan statistical area ("MSA").  Pursuant to such Initial
                                        ---
Business Plan, the Company will require a certain level of capital to establish
itself in the Chicago MSA, such amount having been determined to be $8 million,
$4 million of which the Company will need at the time of the Initial Closing.

          Thus, pursuant to the terms and subject to the conditions set forth
herein, this Agreement contemplates an initial transaction in which the
Investors will buy from the Company, and the Company will sell to the Investors,
79,384.62 shares of the Company's  Class A Common Stock, par value $.01 per
share (the "Class A Common") for an aggregate purchase price of $4 million, and
            --------------
subsequent transactions in which the Investors will make pro rata contributions
to the capital of the Company of up to an additional $21.8 million in the
aggregate (for a total investment, including the $4 million initial purchase, of
up to $25.8 million).  Attached as Appendix C hereto is the original offering
                                   ----------
memorandum of the Company, which is included for reference purposes only and
shall in no way be construed as a Subsequent Business Plan (as defined below) or
a proposal therefor, nor considered to obligate any party hereto to approve any
Subsequent Business Plan.

                                       1
<PAGE>
 
          Additionally, this Agreement contemplates that after the Initial
Closing hereunder (as defined below), Frontenac's designee(s) (or, if none,
Frontenac) may purchase up to 230.77 shares of Class A Common for a total
initial purchase price of up to $11,627.91, and MDCP's  designee(s) (or, if
none, MDCP) may purchase up to 384.61 shares of Class A Common for a total
initial purchase price of $19,379.84 upon entering into a written counterpart to
this Agreement agreeing to be bound by the provisions of such purchases hereof.
All such additional purchasers shall be considered Investors and all such
purchased Class A Common shall be considered Investor Stock; provided that any
                                                             --------
such additional purchaser may prepay its capital contribution commitment to the
Company pursuant to this Agreement at the time of purchase (in the amount of
$325 per share, less the purchase price paid for such shares), upon which
prepayment such additional purchaser shall be under no further obligation to
make subsequent capital contributions hereunder.

          NOW, THEREFORE, in consideration of the  mutual promises made herein
and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the parties hereto agree as follows:

          SECTION 1.  AUTHORIZATION AND CLOSINGS.
                      -------------------------- 

          1.1A.  Authorization of the Class A Common.  The Company shall
                 -----------------------------------
authorize the issuance and sale to the Investors of 80,000 shares of its Class A
Common, having the rights and preferences set forth in the Restated Certificate
of Incorporation attached hereto as Exhibit 2.
                                    ---------

          1.1B.  Purchase and Sale of the Class A Common.  At the Initial
                 ---------------------------------------
Closing (as defined below), subject to the terms and conditions set forth
herein, the Company shall sell to each Investor and each Investor shall purchase
from the Company the number of shares of Class A Common set forth opposite such
Investor's name on the "Schedule of Investors," which is attached hereto as
                        --------------------- 
Appendix B.  The aggregate purchase price to be paid at the Initial Closing by
- ----------
each Investor, which is set forth opposite such Investor's name on the Schedule
of Investors, is referred to herein as that Investor's "Initial Contribution."
                                                        -------------------- 
The sale of the Class A Common to each Investor at the Initial Closing shall
constitute a separate sale hereunder.

          1.1C.  The Initial Closing.  The closing of the separate initial
                 -------------------
purchases and sales of the Class A Common (the "Initial Closing") shall take
                                                ---------------
place at the offices of Kirkland & Ellis at 8:30 a.m. on November 27, 1996, or
at such other place or on such other date as may be mutually agreeable to the
Company and the Investors (the "Initial Closing Date"), but in no event shall
                                --------------------
the Initial Closing Date be later than November 30, 1996.  At the Initial
Closing, the Company shall deliver to each Investor stock certificates
evidencing the Class A Common to be purchased by such Investor, registered in
such Investor's name, upon such Investor's delivery to the Company of either of
the following:

               (i)    in the case of an Institutional Investor, a cashier's or
     certified check or wire transfer of immediately available funds to an
     account designated by the Company (collectively, "Cash"), in the aggregate
                                                       ----
     amount of such Institutional Investor's Initial Contribution, or

                                      -2-
<PAGE>
 
               (ii)   in the case of an Executive Investor, canceled Company
     notes (as well as documentation acceptable in good faith to the
     Institutional Investors sufficient to demonstrate such amounts were loaned
     to the Company) in the aggregate amount of $6,000, together with Cash, or
     if so specified opposite such Executive Investor's name on the Schedule of
     Investors, a combination of Cash and a ninety-day promissory note in the
     form of Exhibit 3 attached hereto (such Executive Investor's "Note") in the
             ---------                                             ----
     proportion specified opposite such Executive Investor's name on the
     Schedule of Purchasers, in an aggregate amount equal to such Executive
     Investor's Initial Contribution minus $6,000. Each Executive Investor's
                                     -----
     Note (including any such Notes issued at Subsequent Closings, as defined
     below) shall be secured by a pledge of all Company securities owned by such
     Executive Investor (including any such securities acquired hereafter at any
     time that such Note is outstanding, but excluding shares of Class C Common
     pledged to an Institutional Investor pursuant to a Vesting Agreement), and
     in connection therewith, such Executive Investor will enter into a pledge
     agreement in the form of Exhibit 4 attached hereto (the "Executive Investor
                              ---------                       ------------------
     Stock Pledge Agreement").
     ----------------------
          1.1D.  The Subsequent  Closings.  Each of the subsequent closings
                 ------------------------
hereunder (the "Subsequent Closings") shall, subject to the terms and conditions
                -------------------
set forth below, occur (i) if the Specified Contribution of each Investor at
such Subsequent Closing, together with the Initial Contribution and the
aggregate Specified Contributions of each such Investor at all prior Subsequent
Closings, will not exceed 80/258 times the maximum commitment set forth opposite
                                 -----
each such Investor's name on the Schedule of Investors (each such Investor's
"Maximum Commitment"), at a time and place determined by the Company's president
 ------------------
and set forth in a written notice given to each Investor at least 10 days (or,
if BV does not have immediately available funds sufficient to satisfy its
obligation at such Subsequent Closing, 15 days) prior to the applicable
Subsequent Closing, or (ii) otherwise, at a time and place determined by the
Company's board of directors (the "Board") and set forth in a written notice
                                   -----
sent to each Investor at least 30 days prior to the applicable Subsequent
Closing.  Such notice shall set forth the aggregate amount to be contributed by
the Investors at such Subsequent Closing and the pro rata portion thereof (based
on the Investors' respective Initial Contributions) to be contributed by each
Investor (each Investor's "Specified Contribution" for such Subsequent Closing);
                           ----------------------
provided that the aggregate amount of each Investors' Specified Contribution at
- --------
any Subsequent Closing shall not, together with the Initial Contribution and the
aggregate Specified Contributions of each such Investor at all prior Subsequent
Closings, exceed each such Investor's Maximum Commitment.  At each Subsequent
Closing, each Investor shall deliver to the Company either of the following:

               (i)    in the case of an Institutional Investor, Cash in the
     aggregate amount of such Institutional Investor's Specified Contribution
     for such Subsequent Closing, or

               (ii)    in the case of an Executive Investor, Cash or, at the
     election of such Executive Investor, Cash and a ninety-day Note, in an
     aggregate amount equal to such Executive Investor's Specified Contribution
     for such Subsequent Closing.

          SECTION 2.   CONDITIONS TO THE INITIAL CLOSING.  The obligation of
                       ---------------------------------
each Investor to purchase and pay for the Class A Common at the Initial Closing
is subject to the satisfaction as of the Initial Closing of the following
conditions:

                                      -3-
<PAGE>
 
          2.1A.  Representations and Warranties; Covenants.  The representations
                 -----------------------------------------
and warranties contained in Section 7 and 8 hereof shall be true and correct in
all material respects at and as of the Initial Closing as though then made,
except to the extent of changes caused by the transactions expressly
contemplated herein, and the Company shall have performed in all material
respects all of the covenants required to be performed by it hereunder prior to
the Initial Closing.

          2.1B.  Amendment of Certificate of Incorporation.  The Company's
                 -----------------------------------------
Certificate of Incorporation shall have been amended to include the provisions
set forth in Exhibit 2 hereto (as so amended, the "Certificate of
             ---------                             --------------
Incorporation"), shall be in full force and effect under the laws of Delaware as
- -------------
of the Initial Closing as so amended, and shall not have been further amended or
modified.

          2.1C.  Amendment of the Company's Bylaws.  The Company's bylaws shall
                 ---------------------------------
have been duly amended to include the provisions set forth in Exhibit 5 hereto
                                                              ---------
(as so amended, the "Bylaws"), shall be in full force and effect under the laws
of Delaware as of the Initial Closing as so amended, and shall not have been
further amended or modified.

          2.1D.  Stockholders Agreement.  The Company and the Investors shall
                 ----------------------
have entered into a stockholders agreement in form and substance set forth in
Exhibit 6 attached hereto (the "Stockholders Agreement"), and the Stockholders
- ---------                       ----------------------
Agreement shall be in full force and effect as of the Initial Closing.

          2.1E.  Executive Stock Agreements.  The Company shall have entered
                 --------------------------
into an executive stock agreement and employment agreement, in form and
substance substantially similar to Exhibit 7 attached hereto (the "Executive
                                   ---------                       ---------
Stock Agreements"), with each Executive Investor, and each Executive Stock
- ----------------
Agreement shall not have been amended or modified and shall be in full force and
effect as of the Initial Closing.

          2.1F.  Registration Agreement.  The Company and the Investors shall
                 ---------------------- 
have entered into a registration agreement in form and substance as set forth in
Exhibit 8 attached hereto (the "Registration Agreement"), and the Registration
- ---------                       ----------------------
Agreement shall be in full force and effect as of the Initial Closing.

          2.1G.  Vesting Agreements.  The Company and the Executive Investors
                 ------------------
shall have entered into a vesting agreement, in form and substance substantially
similar to Exhibit 9 attached hereto (the "Vesting Agreements"), with each
           ---------                       ------------------
Institutional Investor, and each Vesting Agreement shall be in full force and
effect as of the Initial Closing.

          2.1H.  Interconnection Agreement and Achievement of Common Carrier
                 -----------------------------------------------------------
Status. The Company shall have entered into an Interconnection Agreement under
- ------
Sections 251 and 252 of the Telecommunications Act of 1996, with Ameritech
Information Industrial Services, a division of Ameritech Services, Inc., on
behalf of Ameritech Illinois, in form and substance as set forth in Exhibit 10
                                                                    ----------
attached hereto (the "Interconnection Agreement"), and such Interconnection
                      ------------------------- 
Agreement shall be in full force and effect as of the Initial Closing.  In
addition, the Company shall have been certified by the Illinois Commerce
Commission to provide

                                      -4-
<PAGE>
 
facilities-based and resold, switched and dedicated, local exchange services in
the portions of MSA-1 served by Ameritech and Centel, and interexchange services
throughout Illinois ("Chicago Common Carrier Status"), and such certification
                      -----------------------------
shall not have been conditioned, restricted or withdrawn, and shall not be under
challenge, as of the Initial Closing.

          2.1I.  Sale of Class A Common to Each Investor.  The Company shall
                 ---------------------------------------
have simultaneously sold to each Investor the Class A Common to be purchased by
such Investor hereunder at the Initial Closing and shall have received payment
therefor in full as specified in paragraph 1C hereof.

          2.1J.  Securities Law Compliance.  The Company shall have made all
                 -------------------------
filings under all applicable federal and state securities laws necessary to
consummate the issuance, in compliance with such laws, of the Class A Common to
be issued at the Initial Closing pursuant to this Agreement.

          2.1K.  Opinion of the Company's Counsel.  Each Investor shall have
                 --------------------------------
received from Bischoff, Kenney, and Niehaus, counsel for the Company, an opinion
with respect to the matters set forth in Exhibit 11 attached hereto, which shall
                                         ----------
be addressed to each Investor, dated the Initial Closing Date, and in form and
substance satisfactory to each Investor.

          2.1L.  Proceedings.  All corporate and other proceedings taken or
                 -----------
required to be taken by the Company in connection with the transactions to occur
at the Initial Closing shall be consummated at or prior to the Initial Closing
and all documents incident thereto shall be satisfactory in form and substance
to each Institutional Investor and the Institutional Investors' special counsel.

          2.1M.  Expenses.  At the Initial Closing, the Company shall have (i)
                 --------
reimbursed the Institutional Investors for their out-of-pocket expenses,
including the fees and expenses of their special counsel and special
telecommunications counsel as provided in paragraph 9A hereof, to the extent
then known, (ii) paid the fees and expenses of the counsel for the Company
related to the transactions contemplated hereby, to the extent then known, and
(iii) reimbursed Beatty for his reasonable expenses incurred in relocating from
Charlotte, North Carolina to Chicago, Illinois, to the extent then known,
provided that such reimbursement to Beatty shall not exceed $25,000.
- --------

          2.1N.  Compliance with Applicable Laws.  The purchase of Class A
                 -------------------------------
Common by each Investor hereunder at the Initial Closing shall not be prohibited
by any applicable law or governmental rule or regulation and shall not subject
such Investor to any penalty, liability or, in such Investor's reasonable
judgment, other onerous condition under or pursuant to any applicable law or
governmental rule or regulation, and the purchase of the Class A Common by each
Investor hereunder shall be permitted by the laws, rules and regulations of the
jurisdictions and governmental authorities and agencies to which such Investor
is subject.

          2.1O.  Initial Closing Documents.  The Company shall have delivered to
                 -------------------------                                      
each Investor all of the following documents:

                                      -5-
<PAGE>
 
               (i)    an Officer's Certificate, dated as of the Initial Closing
     Date, stating that the conditions specified in paragraphs 1A, 2A-2C, 2E,
     and 2H-2J, have been fully satisfied;

               (ii)    certified copies of (a) the resolutions duly adopted by
     the Board authorizing the execution, delivery and performance of this
     Agreement, the Stockholders Agreement, the Executive Stock Agreements, the
     Registration Agreement and each of the other agreements contemplated
     hereby, the filing of the amendment to the Company's certificate of
     incorporation referred to in paragraph 2B, the amendment to the Company's
     bylaws referred to in paragraph 2C, the issuance and sale of the Class A
     Common, and the consummation of all other transactions to occur as of the
     Initial Closing as contemplated by this Agreement, and (b) the resolutions
     duly adopted by the Company's stockholders adopting the amendment to the
     certificate of incorporation referred to in paragraph 2B;

               (iii)  certified copies of the Certificate of Incorporation and
     the Bylaws, each as in effect at the Initial Closing;

               (iv)   certified copies of the Executive Stock Agreements and the
     Interconnection Agreement, each as in effect at the Initial Closing;

               (v)    copies of all third party and governmental consents,
     approvals and filings required in connection with the consummation of the
     transactions to occur as of the Initial Closing hereunder (including,
     without limitation, all blue sky law filings, waivers of all preemptive
     rights and rights of first refusal, and certified orders of the Illinois
     Commerce Commission certifying the Company for Chicago Common Carrier
     Status and approving the Interconnection Agreement);

               (vi) such other documents relating to the transactions
     contemplated by this Agreement as any Institutional Investor or the
     Institutional Investors' special counsel, or any Executive Investor or the
     counsel for the Company, may reasonably request.

          2.1P.  Waiver.  Any condition specified in this Section 2 may be
                 ------
waived if such waiver is consented to by each Investor; provided that no such
                                                        --------
waiver shall be effective against any Investor unless it is set forth in a
writing executed by such Investor.

          SECTION 3.  CONDITIONS TO EACH SUBSEQUENT CLOSING.  The obligation of
                      -------------------------------------
each Investor to make such Investor's Specified Contribution to the capital of
the Company at each Subsequent Closing is subject to the satisfaction as of such
Subsequent Closing of

               (i)    if the Specified Contribution of each Investor at such
     Subsequent Closing, together with the Initial Contribution and the
     aggregate Specified Contributions of each such Investor at all prior
     Subsequent Closings, will not exceed 80/258 times such Investor's Maximum
                                                 -----
     Commitment, the following condition: As of the date of such Subsequent
     Closing, there shall not have been any loss or invalidity of the
     Interconnection Agreement or of any similar agreement entered into after
     the date hereof, any change in

                                      -6-
<PAGE>
 
     the laws or regulations to which the Company is subject that negatively
     affects the ability of the Company to conduct its business, nor any
     conditioning, restriction, or withdrawal of Chicago Common Carrier Status
     or of any similar certification granted after the date hereof; or

               (ii)   otherwise, all of the following conditions:

          3.1A.  Authorized by Initial and/or Subsequent Business Plan(s).  The
                 -------------------------------------------------------- 
Specified Contributions of all Investors at such Subsequent Closing shall be
contemplated and authorized under the terms of the Initial Business Plan and/or
any Subsequent Business Plan(s).  "Subsequent Business Plan" means a business
                                   ------------------------
proposal submitted by Management to the Board setting forth proposed business
activities of the Company during a specified period of time, projections of
income from such business activities, the capital contributions Management deems
necessary to support such business activities during such time, and a budget of
expected expenditures of such capital, where such proposal has been approved by
a majority of the Board and the holders of at least 67% of the Institutional
Investor Stock then outstanding.  "Management" means the Executive Investors (so
                                   ----------
long as such individuals are employed by the Company) together with such other
employees of the Company or its Subsidiaries as may be designated by the
Executive Investors and approved by the Board.

          3.1B.  Representations and Warranties.  The representations and
                 ------------------------------
warranties contained in paragraphs 7A, 7B(ii), 7C, 7J, 7K, 7L, and 7O hereof
shall be true and correct in all material respects at and as of such Subsequent
Closing as though then made, except to the extent of changes caused by the
transactions expressly contemplated herein.

          3.1C.  No Default.  The Company shall not be in default of any of its
                 ---------- 
obligations to the Investors pursuant to this Agreement, the Stockholders
Agreement, the Registration Agreement, or any Executive Stock Agreement or
Vesting Agreement, and neither the Company nor any of its Subsidiaries (if any)
shall be in material default under any other material agreement to which it is a
party.

          3.1D.  No Material Adverse Change.  The Investors shall not be
                 --------------------------
obligated to make their Specified Contributions at a Subsequent Closing if, in
the good faith judgment of all of the Institutional Investors then holding at
least 3% of the Company's outstanding Common Stock, a material adverse change
(other than a change specifically and expressly contemplated in a Subsequent
Business Plan approved prior to the date of such Subsequent Closing) has
occurred after the date hereof and prior to such Subsequent Closing in the
business, financial condition, operations, assets, or business prospects of the
Company or any Subsidiary.  Material adverse change shall for the purposes of
this paragraph include, without limitation, the loss or invalidity of any
material contract or agreement to which the Company is a party where such loss
or invalidity negatively affects the ability of the Company to conduct its
business (including, but not limited to, the Interconnection Agreement and any
similar agreement entered into after the date hereof), or the conditioning,
restriction, or withdrawal of Chicago Common Carrier Status or any similar
certification granted after the date hereof.

                                      -7-
<PAGE>
 
          3.1E.  Proceedings.  All corporate and other proceedings taken or
                 -----------
required to be taken by the Company in connection with the transactions to occur
at the Subsequent Closing as contemplated by this Agreement shall be consummated
at or prior to the Subsequent Closing and all documents incident thereto shall
be reasonably satisfactory in form and substance to each Investor and the
Investors' special counsel.

          3.1F.  Opinion of the Company's Counsel.  The Investors shall have
                 --------------------------------
received from Bischoff, Kenney, and Niehaus, counsel for the Company, an opinion
with respect to the matters set forth in Exhibit 12 attached hereto, which shall
                                         ----------
be addressed to the Investors, dated the date of the Subsequent Closing, and in
form and substance satisfactory to the holders of at least 67% of the
Institutional Investor Stock then outstanding.

          3.1G.  Expenses.  At such Subsequent Closing, the Company shall have
                 --------
reimbursed the Institutional Investors for their out-of-pocket expenses,
including the fees and expenses of their special counsel and their special
telecommunications counsel as provided in paragraph 9A hereof, to the extent
then known, and shall have reimbursed the Executive Investors for all of the
fees and expenses of the Executive Investors' special counsel incurred in
connection with such Subsequent Closing, to the extent then known.

          3.1H.  Subsequent Closing Documents.  The Company shall have delivered
                 ----------------------------
to the Investors all of the following documents:

               (i)    an Officer's Certificate, dated the date of the Subsequent
     Closing, stating that the conditions specified in paragraphs 3A through 3C,
     inclusive, have been fully satisfied;

               (ii)   certified copies of the resolutions duly adopted by the
     Board requesting the capital contributions being made at such Subsequent
     Closing; and

               (iii)  such other documents relating to the transactions to occur
     at such Subsequent Closing as any Institutional Investor or the
     Institutional Investors' special counsel may reasonably request.

          3.1I.  Waiver.  Any condition specified in this Section 3 may be
                 ------
waived if consented to by holders of at least 67% of the Institutional Investor
Stock; provided that the condition in 3G respecting the Company's payment of the
       --------
fees and expenses for the Executive Investors' special counsel may not be waived
without the express written consent of a majority of the Executive Investors.

          SECTION 4.  COVENANTS.
                      --------- 

          4.1A.  Financial Statements and Other Information.  The Company shall
                 ------------------------------------------
deliver (a) to each Executive Investor, so long as such Executive Investor holds
any Investor Stock,  the information set forth in subparagraph 4A(iii) below,
and (b) to each Institutional Investor, so long as such Institutional Investor
holds any Investor Stock, and to any subsequent holder of at least

                                      -8-
<PAGE>
 
10% of the Investor Stock then outstanding (each such Institutional Investor and
each such subsequent 10% holder, a "Qualified Holder"), all the information
                                    ----------------
described in this paragraph 4A:

               (i)    as soon as available but in any event within 30 days after
     the end of each monthly accounting period in each fiscal year: (a)
     unaudited consolidating and consolidated statements of income and cash
     flows of the Company and its Subsidiaries for such monthly period and for
     the period from the beginning of the fiscal year to the end of such month,
     and unaudited consolidating and consolidated balance sheets of the Company
     and its Subsidiaries as of the end of such monthly period, setting forth in
     each case comparisons to the Company's annual budget and to the
     corresponding period in the preceding fiscal year, and all such statements
     shall be prepared in accordance with generally accepted accounting
     principles, consistently applied and shall be certified by the Company's
     chief financial officer, and (b) a status report prepared by the Company's
     chief financial officer, indicating whether the Company has met its
     budgeted financial goals (including those specified in the Initial Business
     Plan or in any Subsequent Business Plan), discussing the reasons for any
     variation from such goals, and describing what actions the Company and its
     Subsidiaries have taken and propose to take in order to meet budgeted
     financial targets in the future;

               (ii)   within 45 days after the end of each quarterly accounting
     period in each fiscal year, an Officer's Certificate stating that the
     Company is not in default under this Agreement, the Stockholders Agreement,
     the Registration Agreement, or any Executive Stock Agreement or Vesting
     Agreement, and that neither the Company nor any of its Subsidiaries is in
     default under any of its other material agreements or, if any such default
     exists, specifying the nature and period of existence thereof and what
     actions the Company and its Subsidiaries have taken and propose to take
     with respect thereto;

               (iii)  within 90 days after the end of each fiscal year,
     consolidating and consolidated statements of income and cash flows of the
     Company and its Subsidiaries for such fiscal year, and consolidating and
     consolidated balance sheets of the Company and its Subsidiaries as of the
     end of such fiscal year, setting forth in each case comparisons to the
     Company's annual budget and to the preceding fiscal year, all prepared in
     accordance with generally accepted accounting principles, consistently
     applied, and accompanied by (a) with respect to the consolidated portions
     of such statements, an opinion containing no exceptions or qualifications
     (except for qualifications regarding specified contingent liabilities) of
     an independent accounting firm of recognized national standing acceptable
     to the holders of at least 67% of the Institutional Investor Stock then
     outstanding, (b) a certificate from such accounting firm, addressed to the
     Board, stating that in the course of its examination nothing came to its
     attention that caused it to believe that there was any default specified in
     paragraph 4A(ii) in existence or that there was any other default by the
     Company or any Subsidiary in the fulfillment of or compliance with any of
     the terms, covenants, provisions or conditions of any other material
     agreement to which the Company or any Subsidiary is a party or, if such
     accountants have reason to believe any such default by the Company or any
     Subsidiary exists, a certificate specifying the nature and period of
     existence thereof, and (c) a copy of such firm's annual management letter
     to the Board;

                                      -9-
<PAGE>
 
               (iv)   promptly upon receipt thereof, any additional reports,
     management letters or other detailed information concerning significant
     aspects of the Company's operations or financial affairs given to the
     Company by its independent accountants (and not otherwise contained in
     other materials provided hereunder);

               (v)    at least 30 days but not more than 90 days prior to the
     beginning of each fiscal year, an annual budget prepared on a monthly basis
     for the Company and its Subsidiaries for such fiscal year (displaying
     anticipated statements of income and cash flows and balance sheets), and
     promptly upon preparation thereof any other significant budgets prepared by
     the Company and any revisions of such annual or other budgets, and within
     30 days after any monthly period in which there is a material adverse
     deviation from the annual budget, an Officer's Certificate explaining the
     deviation and what actions the Company has taken and proposes to take with
     respect thereto;

               (vi)   promptly (but in any event within five business days)
     after the discovery or receipt of notice of any default under any material
     agreement to which the Company or any of its Subsidiaries is a party, any
     condition or event which is reasonably likely to result in any material
     liability under any federal, state or local statute or regulation relating
     to public health and safety, worker health and safety or pollution or
     protection of the environment or any other material adverse change, event
     or circumstance affecting the Company or any Subsidiary (including, without
     limitation, the filing of any material litigation against the Company or
     any Subsidiary or the existence of any dispute with any Person which
     involves a reasonable likelihood of such litigation being commenced), an
     Officer's Certificate specifying the nature and period of existence thereof
     and what actions the Company and its Subsidiaries have taken and propose to
     take with respect thereto;

               (vii)  within ten days after transmission thereof, copies of all
     financial statements, proxy statements, reports and any other general
     written communications which the Company sends to its stockholders and
     copies of all registration statements and all regular, special or periodic
     reports which it files, or (to its knowledge) any of its officers or
     directors file with respect to the Company, with the Securities and
     Exchange Commission or with any securities exchange on which any of its
     securities are then listed, and copies of all press releases and other
     statements made available generally by the Company to the public concerning
     material developments in the Company's and its Subsidiaries' businesses;
     and

               (viii) with reasonable promptness, such other information and
     financial data concerning the Company and its Subsidiaries as any Qualified
     Holder may reasonably request.

Each of the financial statements referred to in subparagraphs 4A(i) and (iii)
shall be true and correct in all material respects as of the dates and for the
periods stated therein, subject in the case of the unaudited financial
statements to changes resulting from normal year-end adjustments for recurring
accruals (none of which would, alone or in the aggregate, be materially adverse
to

                                      -10-
<PAGE>
 
the financial condition, operating results, assets, operations or business
prospects of the Company and its Subsidiaries taken as a whole).

Notwithstanding the foregoing, the provisions of this paragraph 4A shall cease
to be effective so long as the Company (a) is subject to the periodic reporting
requirements of the Securities Exchange Act and continues to comply with such
requirements and (b) promptly provides to each Qualified Holder (and to each
Executive Investor then holding any Investor Stock) all reports and other
materials filed by the Company with the Securities and Exchange Commission
pursuant to the periodic reporting requirements of the Securities Exchange Act;
provided that so long as any Investor Stock remains outstanding, the Company
- --------
shall continue to deliver to each Qualified Holder the information specified in
subparagraphs 4A(ii), 4A(iii)(b), 4A(vi), and 4A(viii).

Except as otherwise required by law or judicial order or decree or requested by
any governmental agency or authority, or as specified in the immediately
following proviso, each Person entitled to receive information regarding the
Company and its Subsidiaries under paragraph 4A or 4B shall not disclose any
such information to any third party (other than such Person's advisors or
representatives); provided that such a Person may disclose such information (i)
                  --------
in connection with the sale or transfer of any Investor Stock if such Person's
transferee agrees in writing to be bound by the provisions hereof, or (ii) if
such information is available to the public other than by reason of such
Person's breach of this provision.

All holdings of Investor Stock or Institutional Investor Stock by Persons who
are Affiliates of each other shall be aggregated for purposes of meeting any
threshold tests under this Agreement.

          4.1B.  Inspection of Property.  To the extent not otherwise prohibited
                 ----------------------
by law or regulation, the Company shall permit any representatives designated by
any Qualified Holder, upon reasonable notice and during normal business hours
and at such other times as any such Qualified Holder may reasonably request to
(i) visit and inspect any of the properties of the Company and its Subsidiaries,
(ii) examine the corporate and financial records of the Company and its
Subsidiaries and make copies thereof or extracts therefrom and (iii) discuss the
affairs, finances and accounts of any such corporations with the directors,
officers, key employees and independent accountants of the Company and its
Subsidiaries.  The presentation of an executed copy of this Agreement by any
Qualified Holder to the Company's independent accountants shall constitute the
Company's permission to its independent accountants to participate in
discussions with such Persons.

          4.1C.  Restrictions.  The Company shall not, without the prior written
                 ------------
consent of the holders of at least 67% of the Institutional Investor Stock then
outstanding:

               (i)    directly or indirectly declare or pay any dividends or
     make any distributions upon any of its capital stock;

               (ii)   directly or indirectly redeem, purchase or otherwise
     acquire, or permit any Subsidiary to redeem, purchase or otherwise acquire,
     any of the Company's or any Subsidiary's capital stock or other equity
     securities (including, without limitation, warrants, options and other
     rights to acquire such capital stock or other equity securities,

                                     -11-
<PAGE>
 
     and the exercise of first refusal rights under the Stockholders Agreement),
     except for: (a) cancellations of the Company's Common Stock pursuant to any
     of the Vesting Agreements, (b) repurchases of Investor Stock pursuant to
     Section 5 or paragraph 9B(ii) of this Agreement, (c) repurchases of the
     Company's capital stock from employees of the Company or its Subsidiaries
     (or such employees' transferees) pursuant to the terms of the Executive
     Stock Agreements contemplated by this Agreement, or (d) repurchases of
     options to acquire the Company's capital stock or of capital stock issued
     upon the exercise of such options, pursuant to the terms of any Permitted
     Stock Option Plan that may be approved by the Board, as contemplated under
     subparagraph 4C(xix) of this Agreement;

               (iii)  except upon conversion of Class C Common into Class B
     Common pursuant to the Certificate of Incorporation, or as expressly
     contemplated by this Agreement or the Executive Stock Agreement, authorize,
     issue or enter into any agreement providing for the issuance (contingent or
     otherwise) of (a) any notes or debt securities containing equity features
     (including, without limitation, any notes or debt securities convertible
     into or exchangeable for capital stock or other equity securities, issued
     in connection with the issuance of capital stock or other equity securities
     or containing profit participation features), other than as may be
     expressly specified in the Initial Business Plan or any Subsequent Business
     Plan, or (b) any capital stock or other equity securities (or any
     securities convertible into or exchangeable for any capital stock or other
     equity securities);

               (iv)   make, or permit any Subsidiary to make, any loans or
     advances to, guarantees for the benefit of, or Investments in, any Person
     (other than a Wholly-Owned Subsidiary established under the laws of a
     jurisdiction of the United States or any of its territorial possessions),
     except for (a) reasonable advances to employees or customers in the
     ordinary course of business and (b) Investments having a stated maturity no
     greater than one year from the date the Company makes such Investment in
     (1) obligations of the United States government or any agency thereof or
     obligations guaranteed by the United States government, (2) certificates of
     deposit of commercial banks having combined capital and surplus of at least
     $500 million or (3) commercial paper with a rating of at least "Prime-1" by
                                                                     -------
     Moody's Investors Service, Inc.;

               (v)    merge or consolidate with any Person or permit any
     Subsidiary to merge or consolidate with any Person (other than a merger
     between Wholly-Owned Subsidiaries);

               (vi)   sell, lease or otherwise dispose of, or permit any
     Subsidiary to sell, lease or otherwise dispose of, more than 10% of the
     consolidated assets of the Company and its Subsidiaries (computed on the
     basis of book value, determined in accordance with generally accepted
     accounting principles consistently applied, or fair market value,
     determined by the Board in its reasonable good faith judgment) in any
     transaction or series of related transactions (other than sales in the
     ordinary course of business), or sell or permanently dispose of any of its
     or any Subsidiary's Intellectual Property Rights;

                                     -12-
<PAGE>
 
               (vii)  liquidate, dissolve or effect a recapitalization or
     reorganization in any form of transaction (including, without limitation,
     any reorganization into a limited liability company, a partnership or any
     other non-corporate entity which is treated as a partnership for federal
     income tax purposes), except as provided in paragraph 5(d) of the
     Stockholders Agreement;

               (viii) acquire, or permit any Subsidiary to acquire, any
     interest in any company or business (whether by a purchase of assets,
     purchase of stock, merger or otherwise), or enter into any joint venture;

               (ix)   enter into, or permit any Subsidiary to enter into, the
     ownership, active management or operation of any business other than the
     provision of local exchange telecommunications services or such other
     business activities as may be identified in a Subsequent Business Plan;

               (x)    become subject to, or permit any of its Subsidiaries to
     become subject to (including, without limitation, by way of amendment to or
     modification of) any agreement or instrument which by its terms would
     (under any circumstances) restrict (a) the right of any Subsidiary to make
     loans or advances or pay dividends to, transfer property to, or repay any
     Indebtedness owed to, the Company or another Subsidiary or (b) the
     Company's right to perform the provisions of this Agreement, the
     Stockholders Agreement, the Registration Agreement, the Certificate of
     Incorporation or the Bylaws (including, without limitation, the provisions
     of Section 5 hereof);

               (xi)   except as expressly contemplated by this Agreement, make
     any amendment to the Certificate of Incorporation or the Bylaws, or file
     any resolution of the Board with the Delaware Secretary of State containing
     any provisions which would adversely affect or otherwise impair the rights
     or the relative preferences and priorities of the holders of the Class A
     Common under the Certificate of Incorporation;

               (xii)  enter into, amend, modify or supplement, or permit any
     Subsidiary to enter into, amend, modify or supplement, any agreement,
     transaction, commitment or arrangement with any of its or any Subsidiary's
     officers, directors, employees or Affiliates or with any individual related
     by blood, marriage or adoption to any such individual or with any entity in
     which any such Person or individual owns a beneficial interest, except for
     customary employment arrangements and benefit programs on reasonable terms
     and except as otherwise expressly contemplated by this Agreement;

               (xiii) establish or acquire (a) any Subsidiaries other than
     Wholly-Owned Subsidiaries or (b) any Subsidiaries organized outside of the
     United States and its territorial possessions;

               (xiv)  create, incur, assume or suffer to exist, or permit any
     Subsidiary to create, incur, assume or suffer to exist, Indebtedness
     exceeding an aggregate principal amount of $100,000 outstanding at any time
     on a consolidated basis (other than

                                     -13-
<PAGE>
 
     Indebtedness expressly specified in the Initial Business Plan or any
     Subsequent Business Plan);

               (xv)   create, incur, assume or suffer to exist, or permit any
     Subsidiary to create, incur, assume or suffer to exist, any Liens other
     than Permitted Liens;

               (xvi)  make any capital expenditures or permit any Subsidiary to
     make any capital expenditures (including, without limitation, payments with
     respect to capitalized leases, as determined in accordance with generally
     accepted accounting principles consistently applied) exceeding $100,000 in
     the aggregate on a consolidated basis during any twelve-month period (other
     than capital expenditures expressly specified in the Initial Business Plan
     or any Subsequent Business Plan);

               (xvii) enter into any leases or other rental agreements
     (excluding capitalized leases, as determined in accordance with generally
     accepted accounting principles consistently applied) under which the amount
     of the aggregate lease payments for all such agreements exceeds $100,000 on
     a consolidated basis for any twelve-month period, provided that the Company
                                                       --------
     shall be allowed to enter into any leasing arrangements that are necessary
     to the conduct of its business purpose and expressly specified in the
     Initial Business Plan or any Subsequent Business Plan (including, but not
     limited to, leasing telecommunications networks);

               (xviii) change its fiscal year;

               (xix)  adopt any new stock option plan or employee stock
     ownership plan or issue any shares of Common Stock to its or its
     Subsidiaries' employees other than a plan, the terms of which shall be
     approved by a majority of the Board and the holders of at least 67% of the
     Institutional Investor Stock then outstanding, under which during the four-
     year period after the date hereof specified employees of the Company or its
     Subsidiaries are granted options to acquire, for fair market value, up to
     5% (by value) of the Company's common stock (a "Permitted Stock Option
                                                     ----------------------
     Plan");
     ----

               (xx)   issue or sell any shares of the capital stock, or rights
     to acquire shares of the capital stock, of any Subsidiary to any Person
     other than the Company or a Wholly-Owned Subsidiary; or

               (xxi)  use the proceeds from the sale of the Class A Common and
     the subsequent capital contributions at the Subsequent Closings other than
     for working capital and budgeted general corporate purposes or as
     contemplated by the Initial Business Plan and any Subsequent Business Plan,
     as applicable.

The restrictions of this paragraph 4C shall terminate upon the consummation of a
Public Offering.

          4.1D.  Affirmative Covenants.  So long as any Investor Stock remains
                 ---------------------
outstanding, the Company shall, and shall cause each Subsidiary (if any) to:

                                     -14-
<PAGE>
 
               (i)    at all times cause to be done all things necessary to
     maintain, preserve and renew its corporate existence and all material
     licenses, authorizations and permits necessary to the conduct of its
     businesses;

               (ii)   pay and discharge when payable all taxes, assessments and
     governmental charges imposed upon its properties or upon the income or
     profits therefrom (in each case before the same becomes delinquent and
     before penalties accrue thereon) and all material claims for labor,
     materials or supplies which if unpaid would by law become a Lien upon any
     of its property unless and to the extent that the same are being contested
     in good faith and by appropriate proceedings and adequate reserves (as
     determined in accordance with generally accepted accounting principles,
     consistently applied) have been established on its books with respect
     thereto;

               (iii)  comply with all other material obligations which it incurs
     pursuant to any contract or agreement, whether oral or written, express or
     implied, as such obligations become due, unless and to the extent that the
     same are being contested in good faith and by appropriate proceedings and
     adequate reserves (as determined in accordance with generally accepted
     accounting principles, consistently applied) have been established on its
     books with respect thereto;

               (iv)   comply in all material respects with all applicable laws,
     rules and regulations of the FCC and all other governmental authorities
     material to the business of the Company and its Subsidiaries (including,
     without limitation, all requirements for maintaining Chicago Common Carrier
     Status or any similar certification granted after the date hereof);

               (v)    apply for and continue in force with good and responsible
     insurance companies adequate insurance covering risks of such types and in
     such amounts as are customary for well-insured corporations of similar size
     engaged in similar lines of business;

               (vi)   maintain proper books of record and account which present
     fairly in all material respects its financial condition and results of
     operations and make provisions on its financial statements for all such
     proper reserves as in each case are required in accordance with generally
     accepted accounting principles, consistently applied; and

               (vii)  enter into and maintain nondisclosure and noncompete
     agreements, in form and substance as set forth in Exhibit 13 hereto, with
                                                       ----------
     all Persons (other than the Executive Investors) who from time to time
     become key employees of the Company or any of its Subsidiaries.

          4.1E.  Compliance with Agreements.  The Company shall perform and
                 --------------------------
observe all of its obligations to the holders of Common Stock as set forth in
the Certificate of Incorporation and the Bylaws, the Stockholders Agreement, the
Vesting Agreements, the Executive Stock Agreements and the Registration
Agreement.

                                     -15-
<PAGE>
 
          4.1F.  Current Public Information.  At all times after the Company has
                 --------------------------
filed a registration statement with the Securities and Exchange Commission
pursuant to the requirements of either the Securities Act or the Securities
Exchange Act, the Company shall file all reports required to be filed by it
under the Securities Act and the Securities Exchange Act and the rules and
regulations adopted by the Securities and Exchange Commission thereunder and
shall take such further action as any holder or holders of Restricted Securities
may reasonably request, all to the extent required to enable such holders to
sell Restricted Securities pursuant to (i) Rule 144 adopted by the Securities
and Exchange Commission under the Securities Act (as such rule may be amended
from time to time) or any similar rule or regulation hereafter adopted by the
Securities and Exchange Commission or (ii) a registration statement on Form S-2
or S-3 or any similar registration form hereafter adopted by the Securities and
Exchange Commission.  Upon request, the Company shall deliver to any holder of
Restricted Securities a written statement as to whether it has complied with
such requirements.

          4.1G.  Amendment of Vesting Agreements or Executive Stock Agreements.
                 -------------------------------------------------------------
The Company shall not amend, modify or fail to enforce any provision of any
Vesting Agreement or any Executive Stock Agreement without the prior written
consent of the holders of at least 67% of the Institutional Investor Stock then
outstanding.

          4.1H.  Intellectual Property Rights.  The Company shall, and shall
                 ---------------------------- 
cause each Subsidiary to, possess and maintain all material Intellectual
Property Rights necessary to the conduct of their respective businesses and own
all right, title and interest in and to, or have a valid license for, all such
Intellectual Property Rights.  Neither the Company nor any Subsidiary shall take
any action, or fail to take any action, which would result in the invalidity,
abandonment, misuse or unenforceability of such Intellectual Property Rights or
which would infringe upon or misappropriate any rights of other Persons.

          4.1I.  Public Disclosures.  The Company shall not, nor shall it permit
                 ------------------
any Subsidiary to, disclose any Institutional Investor's name or identity as an
investor in the Company in any press release or other public announcement or in
any document or material filed with any governmental entity, without the prior
written consent of such Institutional Investor, unless such disclosure is
required by applicable law or governmental regulations or by order of a court of
competent jurisdiction, in which case prior to making such disclosure the
Company shall give written notice to such Institutional Investor describing in
reasonable detail the proposed content of such disclosure and shall permit the
Institutional Investor to review and comment upon the form and substance of such
disclosure.

          4.1J.  First Refusal Rights.
                 -------------------- 

          (i)    Except for issuances of (a) shares of Class A Common pursuant
to this Agreement, shares of Class B Common pursuant to any of the Executive
Stock Agreements contemplated hereby, or shares of Class B Common upon
conversion of Class C Common into such Class B Common pursuant to the
Certificate of Incorporation, (b) options to acquire Common Stock pursuant to
the Permitted Stock Option Plan, or shares of Common Stock upon the exercise of
such options, or (c) any securities pursuant to a Public Offering, if the
Company authorizes the issuance or sale of any shares of Common Stock or any
securities containing

                                     -16-
<PAGE>
 
options or rights to acquire any shares of Common Stock (other than as a pro
rata dividend on the outstanding Common Stock), the Company shall first offer to
sell to each holder of Investor Stock a portion of such stock or securities
equal to the quotient determined by dividing (1) the number of shares of
Investor Stock held by such holder by (2) the total number of shares of Investor
Stock then outstanding.  Each holder of Investor Stock shall be entitled to
purchase such stock or securities at the most favorable price and on the most
favorable terms as such stock or securities are to be offered to any other
Persons; provided that if all Persons entitled to purchase or receive such stock
or securities are required to also purchase other securities of the Company, the
holders of Investor Stock exercising their rights pursuant to this paragraph
shall also be required to purchase the same strip of securities (on the same
terms and conditions) that such other Persons are required to purchase.  The
purchase price for all stock and securities offered to the holders of the
Investor Stock shall be payable in cash.

          (ii)   In order to exercise its purchase rights hereunder, a holder of
Investor Stock must within 30 days after receipt of written notice from the
Company describing in reasonable detail the stock or securities being offered,
the purchase price thereof, the payment terms and such holder's percentage
allotment, deliver a written notice to the Company describing such holder's
election hereunder.  If all of the securities offered to the holders of Investor
Stock are not fully subscribed by such holders, the remaining stock and
securities shall be reoffered by the Company to the holders purchasing their
full allotment upon the terms set forth in this paragraph, except that such
holders must exercise their purchase rights within five business days after
receipt of such reoffer.

          (iii)  Upon the expiration of the offering periods described above,
the Company shall be entitled to sell such stock or securities which the holders
of Investor Stock have not elected to purchase during the 180 days following
such expiration on terms and conditions no more favorable to the purchasers
thereof than those offered to such holders.  Any stock or securities offered or
sold by the Company after such 180-day period must be reoffered to the holders
of Investor Stock pursuant to the terms of this paragraph.

          (iv)   The rights of the holders of Investor Stock under this
paragraph shall terminate upon the consummation of a Public Offering.

          SECTION 5.  INVESTORS' PUT RIGHT.
                      -------------------- 

          5.1A.  Put Right.  At any time and from time to time on or after the
                 ---------
seventh anniversary of the Initial Closing Date, but not after the consummation
of a Public Offering, each Institutional Investor shall have the right to
require the Company to repurchase  all, but not less than all, of the
outstanding Investor Stock held by such Institutional Investor and its
Affiliates at the Repurchase Price (as defined below) by giving written notice
to the Company of such Institutional Investor's exercise of this right (the
"Exercise Notice"). Within 10 days after receipt of an Exercise Notice, the
 ---------------
Company shall give written notice (the "Repurchase Notice") to each other holder
                                        -----------------
of Investor Stock, setting forth the identity of the Institutional Investor
tendering such Exercise Notice, the number of shares of Investor Stock to be
repurchased from such Investor, and a reasonable approximation of the fair
market value of the Company's assets (net of any Company liabilities senior in
liquidation preference to the Investor Stock) and of each

                                     -17-
<PAGE>
 
share of Investor Stock at the time of such Repurchase Notice. Each Investor
shall be entitled to join in such repurchase and require the Company to purchase
all, but not less than all, of the Investor Stock held by such Investor and its
Affiliates at the same closing, at the same price, and on the same terms as the
Institutional Investor tendering the Exercise Notice by giving Exercise Notice
within 20 days after the date of the Repurchase Notice.  Promptly (but in any
event within 3 business days after the end of this 20-day period), the Company
shall send each Investor written notice updating the information contained in
the Repurchase Notice (the "Revised Repurchase Notice").  The Revised Repurchase
                            ------------------------- 
Notice shall also set forth a time (which shall be not less than 5 nor more than
10 business days after the date of such notice) and place for a meeting between
the Company and the holders of a majority of the Investor Stock which the
Company has been requested to repurchase (the "Majority Holders").
                                               ----------------

          5.1B.  Company Obligation.  The Company shall do everything within its
                 ------------------
power under the law and the Certificate of Incorporation, including but not
limited to assuming or refinancing debt,  recapitalizing the Company, or selling
the Company, to enable the Company to satisfy its repurchase obligations under
this Section 5.
 
          5.1C.  Repurchase Price.  The repurchase price for each share of
                 ----------------
Investor Stock repurchased by the Company under this Section 5 (the "Repurchase
                                                                     ----------
Price") shall be equal to the greater of (i) the initial purchase price of such
- -----
share hereunder and all amounts subsequently contributed to the capital of the
Company with respect to such share pursuant to this Agreement (as adjusted for
stock splits, stock dividends, combinations, or other reorganizations) or (ii)
the fair market value of such share (without any discount for lack of liquidity
or minority status) as of the date of the first Repurchase Notice.

          The Company, the Majority Holders, and the holders of a majority of
the Executive Stock then outstanding shall attempt in good faith to agree on the
fair market value of the Investor Stock.  If they are unable to reach such
agreement within 20 days after the meeting date set forth in the Revised
Repurchase Notice, the Company and the Majority Holders will each, within 10
days thereafter, appoint one investment banker or other appraiser experienced in
valuing companies like the Company, and the two Persons so appointed shall
within 10 days after their appointment appoint a third investment banker or
appraiser similarly experienced.  The three investment bankers/appraisers shall
each appraise the fair market value of the Investor Stock (based on the highest
price reasonably obtainable for the Company in an orderly, arm's length sale to
a willing unaffiliated buyer), and the fair market value for purposes hereof
shall be the average of the two appraisals closest to each other.  Such
determination shall be final and binding on all parties hereto.  The cost of the
appraisal shall be borne by the Company.

              5.1D.  Repurchase Closing.  At the closing of a Company repurchase
                     ------------------
of Investor Stock pursuant to this Section 5 (the "Repurchase Closing"), each
                                                   ------------------
Investor selling Investor Stock shall deliver to the Company all existing stock
certificates evidencing the Investor Stock held by such Investor, upon the
Company's delivery to each such selling Investor of Cash in an aggregate amount
equal to the Repurchase Price of such Investor Stock.

                                     -18-
<PAGE>
 
          SECTION 6.  TRANSFER OF RESTRICTED SECURITIES.
                      --------------------------------- 

          6.1A.  General Provisions.  Restricted Securities are transferable
                 ------------------
only pursuant to (i) public offerings registered under the Securities Act, (ii)
Rule 144 or Rule 144A of the Securities and Exchange Commission (or any similar
rule or rules then in force) if such rule is available, and (iii) subject to the
various conditions and prohibitions set forth in this Agreement, the
Stockholders Agreement, the Vesting Agreements, and the Executive Stock
Agreements, any other legally available means of transfer.

          6.1B.  Opinion Delivery.  In connection with the transfer of any
                 ---------------- 
Restricted Securities (other than a transfer described in paragraph 6A(i) or
(ii) above), the holder thereof shall deliver written notice to the Company
describing in reasonable detail the transfer or proposed transfer, together with
an opinion of Kirkland & Ellis or other counsel which (to the Company's
reasonable satisfaction) is knowledgeable in securities law matters to the
effect that such transfer of Restricted Securities may be effected without
registration of such Restricted Securities under the Securities Act.  In
addition, if the holder of the Restricted Securities delivers to the Company an
opinion of Kirkland & Ellis or such other counsel that no subsequent transfer of
such Restricted Securities shall require registration under the Securities Act,
the Company shall promptly upon such contemplated transfer deliver new
certificates for such Restricted Securities which do not bear the Securities Act
legend set forth in paragraph 9C below.  If the Company is not required to
deliver new certificates for such Restricted Securities not bearing such legend,
the holder thereof shall not transfer the same until the prospective transferee
has confirmed to the Company in writing its agreement to be bound by the
conditions contained in this Section 6 and paragraph 9C.

          6.1C.  Rule 144A.  Upon the request of any Investor, the Company shall
                 ---------
promptly supply to such Investor or its prospective transferees all information
regarding the Company required to be delivered in connection with a transfer
pursuant to Rule 144A of the Securities and Exchange Commission.

          6.1D.  Legend Removal.  If any Restricted Securities become eligible
                 --------------
for sale pursuant to Rule 144(k), the Company shall, upon the request of the
holder of such Restricted Securities, remove the legend set forth in paragraph
9C from the certificates for such Restricted Securities.

          SECTION 7.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  As a
                      ---------------------------------------------
material inducement to the Investors to enter into this Agreement and purchase
the Class A Common  hereunder, the Company hereby represents and warrants that:

          7.1A.  Organization, Corporate Power and Licenses.  The Company is a
                 ------------------------------------------
corporation duly organized, validly existing and in good standing under the laws
of Delaware and is qualified to do business in every jurisdiction in which its
ownership of property or conduct of business requires it to qualify.  The
Company possesses all requisite corporate power and authority and, except as set
forth in the "Licenses Schedule" attached hereto, all material licenses, permits
              -----------------
and authorizations necessary to own and operate its properties, to carry on its
businesses

                                     -19-
<PAGE>
 
as now conducted and presently proposed to be conducted and to carry out the
transactions contemplated by this Agreement.  The copies of the Company's
charter documents and Bylaws which have been furnished to the Investors' special
counsel reflect all amendments made thereto at any time prior to the date of
this Agreement and are correct and complete.

          7.1B.  Capital Stock and Related Matters.
                 --------------------------------- 

          (i)    As of the Initial Closing and immediately thereafter, the
authorized capital stock of the Company (collectively, the "Common Stock") shall
                                                            ------------
consist of (a) 80,000 shares of Class A Common, of which 79,384.62 shall be
issued and outstanding; (b) 35,000 shares of Class B Common Stock, par value
$.01 per share ("Class B Common"), 20,000 shares of which shall be issued and
                 --------------
outstanding, and 14,711.54 shares of which shall be reserved for issuance upon
conversion of the Class C Common Stock, par value $.01 per share ("Class C
                                                                   -------  
Common"); and 15,000 shares of Class C Common, of which 14,711.54 shall be
- ------
issued and outstanding.  Except as set forth on the attached "Capitalization
                                                              -------------- 
Schedule," as of the Initial Closing, the Company shall not have outstanding any
- --------
stock or securities, nor any options, warrants or other rights to acquire
capital stock or securities of the Company.  As of the Initial Closing, all of
the outstanding shares of the Company's capital stock listed on the
Capitalization Schedule shall be validly issued, fully paid and nonassessable.

          (ii)   The Company has not violated any applicable federal or state
securities laws in connection with the offer, sale or issuance of any of its
capital stock, and the offer, sale and issuance of the Class A Common hereunder
or the Class B Common and Class C Common under the Executive Stock Agreements do
not require registration under the Securities Act or any applicable state
securities laws.  To the best of the Company's knowledge, there are no
agreements between the Company's stockholders with respect to the voting or
transfer of the Company's capital stock or with respect to any other aspect of
the Company's affairs, except for the Stockholders Agreement, the Vesting
Agreement, and the Executive Stock Agreements.

          7.1C.  Authorization; No Breach.  The execution, delivery and
                 ------------------------
performance of this Agreement, the Stockholders Agreement, the Registration
Agreement, the Vesting Agreements, the Executive Stock Agreements,  and all
other agreements contemplated hereby to which the Company is a party, the filing
of the amendment of the Company's Certificate of Incorporation referred to in
paragraph 2B above,  and the amendment of the Company's Bylaws referred to in
paragraph 2C above have been duly authorized by the Company.  This Agreement,
the Stockholders Agreement, the Executive Stock Agreements, the Vesting
Agreements, the Registration Agreement, the Certificate of Incorporation, and
all other agreements contemplated hereby to which the Company is a party each
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms.  The execution and delivery by the Company of this
Agreement, the Stockholders Agreement, the Executive Stock Agreements, the
Vesting Agreements, the Registration Agreement and all other agreements
contemplated hereby to which the Company is a party, the offering, sale and
issuance of the Class A Common hereunder and the Class B Common and Class C
Common under the Executive Stock Agreements, the filing of  the amendments to
the Certificate of Incorporation referred to above and the fulfillment of and
compliance with the respective terms hereof and thereof by the Company, do not
and shall not (i) conflict with or result in a breach of the terms, conditions
or provisions of, (ii) constitute a

                                     -20-
<PAGE>
 
default under, (iii) result in the creation of any lien, security interest,
charge or encumbrance upon the Company's or any Subsidiary's capital stock or
assets pursuant to, (iv) give any third party the right to modify, terminate or
accelerate any obligation under, (v) result in a violation of, or (vi) require
any authorization, consent, approval, exemption or other action by or notice or
declaration to, or filing with, any court or administrative or governmental body
or agency pursuant to the charter or Bylaws of the Company, or any law, statute,
rule or regulation to which the Company or any Subsidiary is subject, or any
agreement, instrument, order, judgment or decree to which the Company is
subject.

          7.1D.  Conduct of Business; Absence of Liabilities.  Prior to the
                 -------------------------------------------
Initial Closing, except as set forth on the attached "Liabilities Schedule," the
                                                      --------------------
Company has not conducted any business nor incurred any expenses, obligations or
liabilities (whether accrued, absolute, contingent, unliquidated or otherwise,
whether or not known to the Company and whether due or to become due and
regardless of when asserted).

          7.1E.  Assets.  Except as set forth on the attached "Assets Schedule,"
                 ------                                        --------------- 
the Company  does not own or lease any Assets, whether tangible or intangible
(excluding Intellectual Property Rights).  The Company has good and marketable
title to, or a valid leasehold interest in, all assets listed on the Assets
Schedule, free and clear of all Liens.

          7.1F.  No Subsidiaries.  The Company does not own or hold, and has
                 ---------------
never owned or held, any rights to acquire any shares of stock or any other
security or interest in any other Person.

          7.1G.  Contracts and Commitments.
                 ------------------------- 

          (i)    Except as expressly contemplated by this Agreement or as set
forth on the attached "Contracts Schedule," neither the Company nor any
                       ------------------
Subsidiary is a party to or bound by any written or oral contract of any kind,
including but not limited to any agreement, employee benefit plan, employment
contract, insurance contract, loan agreement, guarantee, lease, license,
warranty, or affirmative or restrictive covenant.

          (ii)   All of the contracts, agreements and instruments set forth on
the Contracts Schedule are valid, binding and enforceable in accordance with
their respective terms.

          (iii)  The Investors' special counsel has been supplied with a true
and correct copy of each of the written instruments, plans, contracts and
agreements and an accurate written description of each of the oral arrangements,
contracts and agreements which are referred to on the Contracts Schedule,
together with all amendments, waivers or other changes thereto.

          7.1H.  Intellectual Property Rights.  The attached "Intellectual
                 ----------------------------                 ------------
Property Schedule" contains a complete and accurate list of all (a) patented or
- -----------------
registered Intellectual Property Rights owned or used by the Company or any
Subsidiary, (b) pending patent applications and applications for registrations
of other Intellectual Property Rights filed by the Company or any Subsidiary,
(c) unregistered trade names and corporate names owned or used by the Company or
any Subsidiary and (d) unregistered trademarks and service marks.  The
Intellectual Property

                                     -21-
<PAGE>
 
Schedule also contains a complete and accurate list of all licenses and other
rights granted by the Company or any Subsidiary to any third party with respect
to any Intellectual Property Rights and all licenses and other rights granted by
any third party to the Company or any Subsidiary with respect to any
Intellectual Property Rights, in each case identifying the subject Intellectual
Property Rights.  Except as set forth on the Intellectual Property Schedule: (a)
the Company or one of its Subsidiaries owns all right, title and interest to, or
has the right to use pursuant to a valid license, all Intellectual Property
Rights necessary for the operation of the businesses of the Company and its
Subsidiaries as presently proposed to be conducted, free and clear of all Liens,
(b) the Company and its Subsidiaries own all right, title and interest in and to
all of the Intellectual Property Rights listed on such schedule, free and clear
of all Liens,  (c) there have been no claims made against the Company or any
Subsidiary asserting the invalidity, misuse, or unenforceability of any of such
Intellectual Property Rights, and there are no valid grounds for the same, and
(d) neither the Company nor any Subsidiary has received any notices of, and is
not aware of any facts which indicate the likelihood of, any infringement or
misappropriation by, or conflict with, any third party with respect to such
Intellectual Property Rights (including, without limitation, any demand or
request that the Company or any Subsidiary license any rights from a third
party).

          7.1I.  Litigation, etc.  Except as set forth on the attached
                 --------------- 
"Litigation Schedule," there are no actions, suits, proceedings, orders,
 -------------------
investigations or claims pending or, to the best of the Company's knowledge,
threatened against or affecting the Company or any Subsidiary (or to the best of
the Company's knowledge, pending or threatened against or affecting any of the
officers, directors or employees of the Company and its Subsidiaries with
respect to their businesses or proposed business activities), or pending or
threatened by the Company or any Subsidiary against any third party, at law or
in equity, or before or by any governmental department, commission, board,
bureau, agency or instrumentality (including, without limitation, any actions,
suit, proceedings or investigations with respect to the transactions
contemplated by this Agreement); neither the Company nor any Subsidiary is
subject to, to the best of the Company's knowledge, any governmental
investigations or inquiries (including, without limitation, inquiries as to the
qualification to hold or receive any license or permit); and, to the best of the
Company's knowledge, there is no basis for any of the foregoing.  Neither the
Company nor any Subsidiary is subject to any judgment, order or decree of any
court or other governmental agency, and neither the Company nor any Subsidiary
has received any opinion or memorandum or legal advice from legal counsel to the
effect that it is exposed, from a legal standpoint, to any liability or
disadvantage which may be material to its business.

          7.1J.  Brokerage.  There are no claims for brokerage commissions,
                 ---------
finders' fees or similar compensation in connection with the transactions
contemplated by this Agreement based on any arrangement or agreement binding
upon the Company. The Company shall pay, and hold each Investor (excluding any
Executive Investor that had actual knowledge of such arrangement or agreement
prior to the date hereof) harmless against, any liability, loss or expense
(including, without limitation, reasonable attorneys' fees and out-of-pocket
expenses) arising in connection with any such claim.

          7.1K.  Governmental Consent, etc.  Except as set forth on the attached
                 -------------------------
"Consents Schedule," no permit, consent, approval or authorization of, or
 -----------------
declaration to or filing with, any

                                     -22-
<PAGE>
 
governmental authority is required in connection with the execution, delivery
and performance by the Company of this Agreement or the other agreements
contemplated hereby, or the consummation by the Company of any other
transactions contemplated hereby or thereby.

          7.1L.  Compliance with Laws.  The Company has not violated any law or
                 --------------------
any governmental regulation or requirement in any material respect.

          7.1M.  Affiliated Transactions.  Except as set forth on the attached
                 -----------------------
"Affiliated Transactions Schedule," no officer, director, employee or Affiliate
 --------------------------------
of the Company or any Subsid iary or any individual related by blood, marriage
or adoption to any such individual or any entity in which any such Person or
individual owns any beneficial interest, is a party to any agreement, contract,
commitment or transaction with the Company or has any material interest in any
material property owned or used by the Company.

          7.1N.  Projections and Pro Forma Financial Statements.
                 ---------------------------------------------- 

          (i)    Included as part of the Initial Business Plan attached hereto
as Exhibit 1 is a true and complete copy of the latest projections of the
consolidated income and cash flows of the Company and its Subsidiaries for the
five consecutive 12-month periods commencing with and following the date hereof.
Such projections have been prepared on the basis of the assumptions set forth
therein, which the Company reasonably believes are fair and reasonable in light
of current and reasonably foreseeable business conditions.

          (ii)   The pro forma consolidated balance sheets of the Company and
its Subsidiaries as of the end of each of the five consecutive 12-month periods
commencing with and following the date hereof, included as part of the Initial
Business Plan attached hereto as Exhibit 1, is complete and correct in all
material respects and presents fairly in all material respects the consolidated
financial condition of the Company and its Subsidiaries as of such date as if
the transactions contemplated by this Agreement had occurred immediately prior
to such date, and such balance sheet contains all pro forma adjustments
necessary in order to fairly reflect such assumption.

          7.1O.  Disclosure.  Neither this Agreement nor any of the exhibits,
                 ---------- 
schedules, attachments, written statements, documents, certificates or other
items supplied to any Investor by or on behalf of the Company with respect to
the transactions contemplated hereby contain any untrue statement of a material
fact or omit a material fact necessary to make each statement contained herein
or therein not misleading; provided that with respect to the financial
                           --------
projections furnished to the Investors by the Company, the Company represents
and warrants only that such projections were based upon assumptions reasonably
believed by the Company to be reasonable and fair as of the date the projections
were prepared in the context of the Company's history and current and reasonably
foreseeable business conditions.  There is no fact which the Company has not
disclosed to the Investors in writing and of which any of its officers,
directors or executive employees is aware and which would reasonably be expected
to have a material adverse effect upon the expected financial condition or
business prospects of the Company and its Subsidiaries taken as a whole.

                                     -23-
<PAGE>
 
          SECTION 8.  REPRESENTATIONS AND WARRANTIES OF THE INSTITUTIONAL
                      ---------------------------------------------------
INVESTORS.  As a material inducement to the Company and the Executive Investors
- ---------
to enter into this Agreement and to engage in the transactions and enter into
the agreements contemplated hereby, each of the Institutional Investors
represents and warrants for itself, severally and not jointly, that:

          8.1A.  Assets.  Such Institutional Investor has sufficient capital and
                 ------
liquidity (including undrawn commitments) to fulfill its capital contribution
obligations under the Initial Business Plan and any Subsequent Business Plan,
pursuant to the terms and subject to the conditions set forth herein.

          8.1B.  Initial Business Plan.  Such Institutional Investor is
                 ---------------------
sophisticated in financial matters and sophisticated in the industry in which
the Company contemplates doing business and has had an opportunity to evaluate
the Initial Business Plan of the Company.

          8.1C.  Authorization.  The execution, delivery and performance of this
                 -------------
Agreement and the other agreements contemplated hereby to which the such
Institutional Investor is a party by such Institutional Investor and the
consummation of the transactions contemplated hereby and thereby have been duly
and validly authorized by all requisite action on the part of such Institutional
Investor and the partners thereof, and no other proceedings on its or their part
(other than giving notice of drawdowns on commitments) is necessary to authorize
the execution, delivery or performance of this Agreement.  This Agreement
constitutes, and each of the other agreements contemplated hereby to which such
Institutional Investor is a party will when executed constitute, a valid and
binding obligation of such Institutional Investor, enforceable in accordance
with their terms, except as enforceability may be limited by bankruptcy,
insolvency, reorganization, moratorium or other laws affecting creditors' rights
generally and limitations on the availability of equitable remedies.


          SECTION 9.  MISCELLANEOUS PROVISIONS.
                      ------------------------ 

          9.1A.  Expenses.   The Company shall pay, and hold each Institutional
                 --------
Investor harmless against liability for the payment of, the out-of-pocket
expenses of the Institutional Investors, including the reasonable fees and
expenses of MDCP's special counsel, Kirkland & Ellis, and their special
telecommunications counsel, Skadden, Arps, Slate, Meagher & Flom, arising in
connection with (i) the performance of due diligence investigations concerning
the Company, the negotiation and execution of this Agreement, and the
consummation of the transac tions to occur at the Initial Closing or any
Subsequent Closing as contemplated hereby, (ii) any amendments or waivers
(whether or not the same become effective) under or in respect of this
Agreement, the agreements contemplated hereby or the Certificate of
Incorporation, (iii) the enforcement of the rights granted under this Agreement,
the agreements contemplated hereby and the Certificate of Incorporation, (iv)
any filing with any governmental agency with respect to such Institutional
Investor's investment in the Company or in any other filing with any
governmental agency with respect to the Company which mentions such
Institutional Investor, and (v) stamp and other taxes which may be payable by
the Institutional Investors in respect of the execution and delivery of this
Agreement or the issuance, delivery or acquisition of any Investor Stock.

                                     -24-
<PAGE>
 
          9.1B.  Remedies.
                 -------- 

          (i)    Each holder of Investor Stock shall have all rights and
remedies set forth in this Agreement and the Certificate of Incorporation and
all rights and remedies which such holders have been granted at any time under
any other agreement or contract and all of the rights which such holders have
under any law. Any Person having any rights under any provision of this
Agreement shall be entitled to enforce (upon demonstration of irreparable harm)
such rights specifically (without posting a bond or other security), to recover
damages by reason of any breach of any provision of this Agreement and to
exercise all other rights granted by law.

          (ii)   If at any Subsequent Closing, after all conditions to such
Subsequent Closing set forth in Section 3 hereof have been either satisfied or
waived pursuant to paragraph 3I, any Investor refuses to tender such Investor's
Specified Contribution for such Subsequent Closing, the Company shall have the
right, in addition to the remedies available under subparagraph 9B(i) above, to
repurchase all shares of Investor Stock held by such refusing Investor or its
Affiliates for an aggregate price equal to such Investor's Initial Contribution
and all Specified Contributions made by such Investor at prior Subsequent
Closings, each with respect to such repurchased shares.  The Company shall have
the option to pay such repurchase price in the form of a promissory note with
the following terms: (a) principal equal to such Investor's Initial Contribution
and all prior Specified Contributions made by such Investor, each with respect
to such repurchased shares; (b) liquidation preference junior to all senior debt
obligations of the Company then or thereafter incurred, and to the Distribution
Preference of the holders of Class A Common under the Certificate of
Incorporation; (c) simple annual interest equal to the prime rate issued by
Citibank from time to time; and (d) all principal and accrued interest due and
payable on the first to occur of (1) the closing of a Public Offering, (2) a
Sale of the Company (as defined in the Stockholders Agreement), and (3) the
fifth anniversary of the issuance of such note; provided that such note shall
                                                --------
not be repaid until the Distribution Preference of the holders of Class A Common
under the Certificate of Incorporation has been fully satisfied.  If an
Investor's holdings of Investor Stock are repurchased pursuant to this
paragraph, such Investor and its Affiliates shall thereafter retain no further
right to enforce or benefit from the provisions of this Agreement or any other
agreement contemplated hereby to which such Investor is a party other than the
promissory note described above, and such Investor and its Affiliates shall
retain no further obligation under this Agreement to make Specified
Contributions at any Subsequent Closing.

          9.1C.  Investor's Investment Representations.  Each Investor hereby
                 ------------------------------------- 
represents that it is acquiring the Restricted Securities purchased hereunder or
acquired pursuant hereto for its own account with the present intention of
holding such securities for purposes of investment, and that it has no intention
of selling such securities in a public distribution in violation of the federal
securities laws or any applicable state securities laws; provided that nothing
                                                         --------
contained herein shall prevent any Investor and subsequent holders of Restricted
Securities from transferring such securities in compliance with the provisions
of Section 6 hereof.  Each certificate or instrument representing Restricted
Securities shall be imprinted with a legend in substantially the following form:

                                     -25-
<PAGE>
 
     "The securities represented by this certificate were originally
     issued on November 27, 1996, and have not been registered under
     the Securities Act of 1933, as amended. The transfer of the
     securities represented by this certificate is subject to the
     conditions specified in the Stock Purchase Agreement dated as of
     November 27, 1996, as amended and modified from time to time,
     between the issuer (the "Company") and certain investors. The
     Company reserves the right to refuse the transfer of such
     securities until such conditions have been fulfilled with respect
     to such transfer. A copy of the Stock Purchase Agreement shall be
     furnished by the Company to the holder hereof upon written
     request and without charge."

          9.1D.  Consent to Amendments.  Except as otherwise expressly provided
                 ---------------------
herein, the provisions of this Agreement may be amended and the Company may take
any action herein prohibited, or omit to perform any act herein required to be
performed by it, only if the Company has obtained the written consent of the
holders of at least 67% of the Institutional Investor Stock, and the holders of
a majority of the Executive Stock, outstanding at the time such amendment or
waiver becomes effective. No course of dealing between the Company and the
holder of any Investor Stock or any delay by such holder in exercising any
rights hereunder or under the Certificate of Incorporation shall operate as a
waiver of any rights of such holder.

          9.1E.  Survival of Representations and Warranties.  All
                 ------------------------------------------
representations and warranties contained herein or made in writing by any party
in connection herewith shall survive the execution and delivery of this
Agreement and the consummation of the transactions contemplated hereby,
regardless of any investigation made by any Investor or on its behalf.

          9.1F.  Successors and Assigns.  Except as otherwise expressly provided
                 ----------------------
herein, all covenants and agreements contained in this Agreement by or on behalf
of any of the parties hereto shall bind and inure to the benefit of the
respective successors and assigns of the parties hereto whether so expressed or
not; provided that a party's obligation to make Specified Contributions at
     --------
Subsequent Closings shall be binding on such party's successors and assigns only
to the extent set forth in an express written assignment signed by such party.
In addition, and whether or not any express assignment has been made, the
provisions of this Agreement which are for any Investor's benefit as an Investor
or holder of Investor Stock are also for the benefit of, and enforceable by, any
subsequent holder of such Investor Stock. Notwithstanding the foregoing, the
rights of the holders of the Investor Stock under this Agreement, the
Stockholders Agreement or the Registration Agreement shall not be exercisable by
or for the benefit of any subsequent holder of Investor Stock if, directly or
indirectly, the assignment of Investor Stock to such subsequent holder breached
any material provision of this Agreement or the Stockholders Agreement.

          9.1G.  Capital and Surplus; Special Reserves.  The Company agrees that
                 -------------------------------------
the capital of the Company (as such term is used in Section 154 of the General
Corporation Law of Delaware) in respect of the shares of Class A Common issued
pursuant to this Agreement shall be equal to the aggregate par value of such
shares and that it shall not increase the capital of the Company with respect to
any shares of the Company's capital stock at any time on or after the date of
this Agreement.  The Company also agrees that it shall not create any special
reserves

                                     -26-
<PAGE>
 
under Section 171 of the General Corporation Law of Delaware without the prior
written consent of the holders of at least 67% of the outstanding Institutional
Investor Stock.

          9.1H.  Severability.  Whenever possible, each provision of this
                 ------------
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be prohibited
by or invalid under applicable law, such provision shall be ineffective only to
the extent of such prohibition or invalidity, without invalidating the remainder
of this Agreement.

          9.1I.  Counterparts.  This Agreement may be executed simultaneously in
                 ------------
two or more counterparts, any one of which need not contain the signatures of
more than one party, but all such counterparts taken together shall constitute
one and the same Agreement.

          9.1J.  Descriptive Headings; Interpretation.  The descriptive headings
                 ------------------------------------
of this Agreement are inserted for convenience only and do not constitute a
substantive part of this Agreement.  The use of the word "including" in this
Agreement shall be by way of example rather than by limitation.

          9.1K.  Governing Law.  The corporate law of the State of Delaware
                 -------------
shall govern all issues and questions concerning the relative rights and
obligations of the Company and its stockholders.  All other issues and questions
concerning the construction, validity, enforcement and interpretation of this
Agreement and the exhibits and schedules hereto shall be governed by, and
construed in accordance with, the laws of the State of Illinois, without giving
effect to any choice of law or conflict of law rules or provisions (whether of
the State of Illinois or any other jurisdiction) that would cause the
application of the laws of any jurisdiction other than the State of Illinois.

          9.1L.  Notices.  All notices, demands or other communications to be
                 -------
given or delivered under or by reason of the provisions of this Agreement shall
be in writing and shall be deemed to have been given when delivered personally
to the recipient, one business day after they are sent to the recipient by
reputable overnight courier service (charges prepaid) or three business days
after they are mailed to the recipient by certified or registered mail, return
receipt requested and postage prepaid.  Such notices, demands and other
communications shall be sent to each Investor at the address indicated on the
Schedule of Investors with a copy to

                         Kirkland & Ellis          
                         200 East Randolph Drive   
                         Chicago, IL 60601         
                         Attention:  Emile Karafiol 

and to the Company at the address indicated below:

                                     -27-
<PAGE>
 
                         Focal Communications Corporation   
                         300 W. Washington Blvd., Suite 1408
                         Chicago, Illinois  60606           
                         Attention:  President               

     with a copy to      Bischoff, Kenney, and Niehaus
                         5630 North Main Street     
                         Sylvania, Ohio  43560      
                         Attention:  Charles Niehaus 

or to such other address or to the attention of such other person as the
recipient party has specified by prior written notice to the sending party.

          9.1M.  Understanding among the Investors.  The determination of each
                 --------------------------------- 
Investor to purchase the Investor Stock pursuant to this Agreement has been made
by such Investor independently of any other Investor and independently of any
statements or opinions as to the advisability of such purchase or as to the
properties, business, prospects or condition (financial or otherwise) of the
Company which may have been made or given by any other Investor or by any agent
or employee of any other Investor.  In addition, it is acknowledged by each of
the other Investors that MDCP has not acted as an agent of such Investor in
connection with making its investment hereunder and that MDCP shall not be
acting as an agent of such Investor in connection with monitoring its investment
hereunder.

          9.1N.  No Strict Construction.  The parties hereto have participated
                 ----------------------
jointly in the negotiation and drafting of this Agreement.  In the event an
ambiguity or question of intent or interpretation arises, this Agreement shall
be construed as if drafted jointly by the parties hereto, and no presumption or
burden of proof shall arise favoring or disfavoring any party by virtue of the
authorship of any of the provisions of this Agreement.


                       *       *       *       *       *

                                     -28-
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of  the date first written above.

 
/s/ Brian F. Addy                  MADISON DEARBORN CAPITAL PARTNERS, L.P.
- ----------------------------
Brian F. Addy                      By Madison Dearborn Partners, L.P., its 
                                   General Partner

                                   By Madison Dearborn Partners, Inc., its 
                                   General Partner

/s/ John R. Barnicle               By   /s/ James N. Perry, Jr.
- ----------------------------          ----------------------------------   
John R. Barnicle                   Its      Vice President
                                      ---------------------------------- 
/s/  Joseph Beatty
- ----------------------------
Joseph Beatty                      FRONTENAC VI, L.P.
                                   By Frontenac Company, its General Partner

/s/  Robert C. Taylor, Jr.         By  /s/ James E. Crawford III
- ----------------------------          ----------------------------------
Robert C. Taylor, Jr.              Its  General Partner
                                      ----------------------------------
 
                                   BATTERY VENTURES III, L.P.
                                   By Battery Partners III, L.P., its General 
                                   Partner 
                                   By   /s/ Richard D. Frisbie
                                      -----------------------------------
                                   Its   Managing Partner
                                      ----------------------------------- 


                                   FOCAL COMMUNICATIONS CORPORATION

                                   By   /s/ Robert C. Taylor, Jr.
                                      -----------------------------------  
                                   Its   President
                                      -----------------------------------
                                     

                                     -29-
<PAGE>
 
                                                                      APPENDIX A
                                                                      ----------

                              INDEX OF DEFINITIONS
                              --------------------

          For the purposes of this Agreement, the following terms have the
meanings set forth below:

          "Addy" has the meaning set forth in the preamble.
           ----

          "Affiliate" of any particular Person means any other Person
           ---------
controlling, controlled by or under common control with such particular Person,
where "control" means the possession, directly or indirectly, of the power to
direct the management and policies of a Person whether through the ownership of
voting securities, contract or otherwise.

          "Agreement" has the meaning set forth in the preamble.
           ---------                                  

          "Barnicle" has the meaning set forth in the preamble.
           --------                                 

          "Beatty" has the meaning set forth in the preamble.
           ------

          "Board" has the meaning set forth in paragraph 1D.
           -----                                        

          "BV" has the meaning set forth in the preamble.
           --                                            

          "Bylaws" has the meaning set forth in paragraph 2C.
           ------                                        

          "Cash" has the meaning set forth in paragraph 1C.
           ----                                        

          "Certificate of Incorporation" has the meaning set forth in paragraph
           ----------------------------                 
2B.

          "Chicago Common Carrier Status" has the meaning set forth in paragraph
           -----------------------------                 
2H.

          "Class A Common" has the meaning set forth in paragraph 1A.
           --------------                              

          "Class B Common" has the meaning set forth in paragraph 7B(i).
           --------------                              

          "Class C Common" has the meaning set forth in paragraph 7B(i).
           --------------                              

          "Common Stock" has the meaning set forth in paragraph 7B(i).
           ------------                              

          "Company" has the meaning set forth in the preamble.
           -------                                  

          "Executive Investor" has the meaning set forth in the preamble.
           ------------------                           

          "Executive Stock" has the meaning ascribed to such term in the 
           ---------------                             
Executive Stock Agreements.

                                     -S1-
<PAGE>
 
          "Executive Stock Agreements" has the meaning set forth in paragraph 
           --------------------------                 
2E.

          "Exercise Notice" has the meaning set forth in paragraph 5A.
           ---------------                              

          "Frontenac" has the meaning set forth in the preamble.
           ---------                                  

          "Indebtedness" means at a particular time, without duplication, (i)
           ------------
any indebtedness for borrowed money or issued in substitution for or exchange of
indebtedness for borrowed money, (ii) any indebtedness evidenced by any note,
bond, debenture or other debt security, (iii) any indebtedness for the deferred
purchase price of property or services with respect to which a Person is liable,
contingently or otherwise, as obligor or otherwise (including, without
limitation, vendor Financing), (iv) any commitment by which a Person assures a
creditor against loss (including, without limitation, contingent reimbursement
obligations with respect to letters of credit), (v) any indebtedness guaranteed
in any manner by a Person (including, without limitation, guarantees in the form
of an agreement to repurchase or reimburse), (vi) any obligations under
capitalized leases with respect to which a Person is liable, contingently or
otherwise, as obligor, guarantor or otherwise, or with respect to which
obligations a Person assures a creditor against loss, (vii) any indebtedness
secured by a Lien on a Person's assets; and (viii) any unsatisfied obligation
for "withdrawal liability" to a "multiemployer plan" as such terms are defined
under ERISA.

          "Initial Business Plan" has the meaning set forth in the preamble.
           ---------------------                     

          "Initial Closing" has the meaning set forth in paragraph 1C.
           ---------------                              


          "Initial Closing Date" has the meaning set forth in paragraph 1C. 
           --------------------                     

          "Initial Contribution" has the meaning set forth in paragraph 1B.
           --------------------                     

          "Institutional Investor" has the meaning set forth in the preamble.
           ----------------------                     

          "Institutional Investor Stock" means (i) the Class A Common issued to
           ----------------------------
the Institutional Investors hereunder, (ii) any securities repurchased by an
Institutional Investor pursuant to paragraph 3(e)(i) of any Executive Stock
Agreement, and (iii) any securities issued directly or indirectly with respect
to the foregoing securities by way of a stock dividend or stock split or in
connection with a combination of shares, recapitalization, merger, consolidation
or other reorganization.  As to any particular shares of Institutional Investor
Stock, such shares shall forever cease to be Institutional Investor Stock when
they have (a) been effectively registered under the Securities Act and disposed
of in accordance with the registration statement covering them, (b) been sold
pursuant to Rule 144 (or any similar provision then in force) under the
Securities Act, or (c) been forfeited pursuant to the provisions of any Vesting
Agreement.

          "Intellectual Property Rights" means all (i) patents, patent
           ----------------------------
applications, patent disclosures and inventions, (ii) trademarks, service marks,
trade dress, trade names, logos and corporate names and registrations and
applications for registration thereof together with all of the goodwill
associated therewith, (iii) copyrights (registered or unregistered) and
copyrightable works and registrations and applications for registration thereof,
(iv) mask works and registrations and applications for registration thereof, (v)
computer software, data, data bases and documen-

                                     -A2-
<PAGE>
 
tation thereof, (vi) trade secrets and other confidential information
(including, without limitation, ideas, formulas, compositions, inventions
(whether patentable or unpatentable and whether or not reduced to practice),
know-how, manufacturing and production processes and techniques, research and
development information, drawings, specifications, designs, plans, proposals,
technical data, copyrightable works, financial and marketing plans and customer
and supplier lists and information), (vii) other intellectual property rights
and (viii) copies and tangible embodiments thereof (in whatever form or medium).

          "Interconnection Agreement" has the meaning set forth in paragraph 2H.
           -------------------------                     

          "Investment" as applied to any Person means (i) any direct or indirect
           ---------- 
purchase or other acquisition by such Person of any notes, obligations,
instruments, stock, securities or ownership interest (including partnership
interests and joint venture interests) of any other Person and (ii) any capital
contribution by such Person to any other Person.

          "Investor" has the meaning set forth in the preamble.
           --------                                  

          "Investor Stock" means (i) the Class A Common issued hereunder, (ii)
           --------------  
any securities repurchased by an Institutional Investor pursuant to paragraph
3(e)(i) of an Executive Stock Agreement, and (iii) any securities issued
directly or indirectly with respect to the foregoing securities by way of a
stock dividend or stock split or in connection with a combination of shares,
recapitalization, merger, consolidation or other reorganization.  As to any
particular shares of Investor Stock, such shares  shall forever cease to be
Investor Stock when they have (a) been effectively registered under the
Securities Act and disposed of in accordance with the registration statement
covering them, (b) been sold pursuant to Rule 144 (or any similar provision then
in force) under the Securities Act, or (c) been forfeited pursuant to the
provisions of any Vesting Agreement.

          "IRC" means the Internal Revenue Code of 1986, as amended, and any
           ---
reference to any particular IRC section shall be interpreted to include any
revision of or successor to that section regardless of how numbered or
classified.

          "IRS" means the United States Internal Revenue Service.
           ---                                          

          "Lien" means any mortgage, pledge, security interest, encumbrance,
           ----
lien or charge of any kind (including, without limitation, any conditional sale
or other title retention agreement or lease in the nature thereof), any sale of
receivables with recourse against the Company, any Subsidiary or any Affiliate,
any filing or agreement to file a financing statement as debtor under the
Uniform Commercial Code or any similar statute other than to reflect ownership
by a third party of property leased to the Company or any Subsidiaries under a
lease which is not in the nature of a conditional sale or title retention
agreement, or any subordination arrangement in favor of another Person (other
than any subordination arising in the ordinary course of business).

          "Majority Holders" has the meaning set forth in paragraph 5A.
           ----------------                              

          "Management" has the meaning set forth in paragraph 3A.
           ----------                              

          "Maximum Commitment" has the meaning set forth in paragraph 1D.
           ------------------                           

                                     -A3-
<PAGE>
 
          "MDCP" has the meaning set forth in the preamble.
           ----                                  

          "MSA"has the meaning set forth in the preamble.
           ---                                           

          "Note" has the meaning set forth in paragraph 1C(ii).
           ----                                        

          "Officer's Certificate" means a certificate signed by the Company's
           ---------------------
president or its chief financial officer, stating that (i) the officer signing
such certificate has made or has caused to be made such investigations as are
reasonably necessary in order to permit him to verify the accuracy of the
information set forth in such certificate and (ii) to the best of such officer's
knowledge, such certificate does not misstate any material fact and does not
omit to state any fact necessary to make the certificate not misleading.

          "Permitted Lien" means:
           --------------        

               (i)    tax liens with respect to taxes not yet due and payable or
     which are being contested in good faith by appropriate proceedings and for
     which appropriate reserves have been established in accordance with
     generally accepted accounting principles, consistently applied;

               (ii)   deposits or pledges made in connection with, or to secure
     payment of, utilities or similar services, workers' compensation,
     unemployment insurance, old age pensions or other social security
     obligations;

               (iii)  purchase money security interests in any property acquired
     by the Company or any Subsidiary to the extent permitted by this Agreement;

               (iv)   interests or title of a lessor under any lease permitted
     by this Agreement;

               (v)    mechanics', materialmen's or contractors' liens or
     encumbrances or any similar lien or restriction for amounts not yet due and
     payable;

               (vi)   easements, rights-of-way, restrictions and other similar
     charges and encumbrances not interfering with the ordinary conduct of the
     business of the Company and its Subsidiaries or detracting from the value
     of the assets of the Company and its Subsidiaries; and

               (vii)  liens outstanding on the date hereof which secure
     Indebtedness and which are described in the schedules to this Agreement.

          "Permitted Stock Option Plan" has the meaning set forth in paragraph
           ---------------------------                                        
4C(xix).

          "Person" means an individual, a partnership, a corporation, a limited
           ------
liability company, an association, a joint stock company, a trust, a joint
venture, an unincorporated organization and a governmental entity or any
department, agency or political subdivision thereof.

                                     -A4-
<PAGE>
 
          "Public Offering" means any underwritten sale of the company's common
           ---------------
stock pursuant to an effective registration statement under the Securities Act
filed with the Securities and Exchange Commission on Form S-1 (or a successor
form adopted by the Securities and Exchange Commission); provided that the
                                                         --------
following shall not be considered a Public Offering: (i) any issuance of common
stock as consideration or financing for a merger or acquisition, and (ii) any
issuance of common stock or rights to acquire common stock to employees of the
Company or its Subsidiaries as part of an incentive or compensation plan.

          "Qualified Holder" has the meaning set forth in paragraph 4A.
           ----------------                                            

          "Registration Agreement" has the meaning set forth in paragraph 2F.
           ----------------------                                            

          "Repurchase Closing" has the meaning set forth in paragraph 5D.
           ------------------                                            

          "Repurchase Notice" has the meaning set forth in paragraph 5A.
           -----------------                                            

          "Repurchase Price" has the meaning set forth in paragraph 5C.
           ----------------                                            

          "Restricted Securities" means (i) the Class A Common issued hereunder,
           ---------------------
and (ii) any securities issued with respect to the securities referred to such
Class A Common by way of a stock dividend or stock split or in connection with a
combination of shares, recapitalization, merger, consolidation or other
reorganization.  As to any particular Restricted Securities, such securities
shall cease to be Restricted Securities when they have (a) been effectively
registered under the Securities Act and disposed of in accordance with the
registration statement covering them, (b) become eligible for sale pursuant to
Rule 144 (or any similar provision then in force) under the Securities Act or
(c) been otherwise transferred and new certificates for them not bearing the
Securities Act legend set forth in paragraph 9C have been delivered by the
Company in accordance with paragraph 6B.  Whenever any particular securities
cease to be Restricted Securities, the holder thereof shall be entitled to
receive from the Company, without expense, new securities of like tenor not
bearing a Securities Act legend of the character set forth in paragraph 9C.

          "Revised Repurchase Notice" has the meaning set forth in paragraph 5A.
           -------------------------                                            

          "Securities Act" means the Securities Act of 1933, as amended, or any
           --------------                                                      
similar federal law then in force.

          "Securities and Exchange Commission" includes any governmental body or
           ----------------------------------
agency succeeding to the functions thereof.

          "Securities Exchange Act" means the Securities Exchange Act of 1934,
           -----------------------  
as amended, or any similar federal law then in force.

          "Specified Contribution" has the meaning set forth in paragraph 1D.
           ----------------------                                            

          "Stockholders Agreement" has the meaning set forth in paragraph 2D.
           ----------------------                                            

          "Subsequent Business Plan" has the meaning set forth in paragraph 3A.
           ------------------------                                            

                                     -A5-
<PAGE>
 
          "Subsequent Closings" has the meaning set forth in paragraph 1D.
           -------------------                                            

          "Subsidiary" means, with respect to any Person, any corporation,
           ----------
limited liability company, partnership, association or other business entity of
which (i) if a corporation, a majority of the total voting power of shares of
stock entitled (without regard to the occurrence of any contingency) to vote in
the election of directors, managers or trustees thereof is at the time owned or
controlled, directly or indirectly, by that Person or one or more of the other
Subsidiaries of that Person or a combination thereof, or (ii) if a limited
liability company, partnership, association or other business entity, a majority
of the partnership or other similar ownership interest thereof is at the time
owned or controlled, directly or indirectly, by any Person or one or more
Subsidiaries of that Person or a combination thereof.  For purposes hereof, a
Person or Persons shall be deemed to have a majority ownership interest in a
limited liability company, partnership, association or other business entity if
such Person or Persons shall be allocated a majority of limited liability
company, partnership, association or other business entity gains or losses or
shall be or control any managing director or general partner of such limited
liability company, partnership, association or other business entity.

          "Taylor" has the meaning set forth in the preamble.
           ------                                            

          "Vesting Agreement" has the meaning set forth in paragraph 2G.
           -----------------                                            

          "Wholly-Owned Subsidiary" means, with respect to any Person, a
           -----------------------
Subsidiary of which all of the outstanding capital stock or other ownership
interests are owned by such Person or another Wholly-Owned Subsidiary of such
Person.

                                     -A6-
<PAGE>
 
                                                                      APPENDIX B
                                                                      ----------
                             SCHEDULE OF INVESTORS
                             ---------------------

<TABLE>
<CAPTION>
                                             Number of     Initial Purchase   Investor's
            Names and                        Shares of        Price for        Maximum
            Addresses                      Class A Common   Class A Common    Commitment
            ---------                      --------------  ----------------  ------------
<S>                                        <C>             <C>               <C>
Madison Dearborn Capital Partners, L.P.        46, 153.85     $2,325,581.40   $15,000,000
Three First National Plaza, Suite 1330
Chicago, Illinois 60670
Tel. (312) 732-5400
Fax (312) 732-4098
Attention: James N. Perry, Jr.
                 and Paul Finnegan

Frontenac VI, L.P.                              21,538.46     $1,085,271.32   $ 7,000,000
135 South LaSalle Street, Suite 3800
Chicago, Illinois
Tel. (312) 368-0044
Fax (312) 368-9520
Attention: James Crawford

Battery Ventures III, L.P.                     10, 769.23     $ 542, 635.66   $ 3,500,000
20 William Street, Suite 200
Wellesley, Massachusetts 02181
Tel. (617) 237-1001
Fax (617) 237-7788
Attention: Richard Frisbie
 
Brian F. Addy                                      230.77     $  11, 627.91   $    75,000
300 Washington Blvd., Suite 1408
Chicago, Illinois 60606
(312) 578-8400

John R. Barnicle                                   230.77     $   11,627.91   $    75,000
300 Washington Blvd., Suite 1408
Chicago, Illinois 60606
(312) 578-8400
 
Joseph Beatty                                      230.77     $   11,627.91   $    75,000
300 Washington Blvd., Suite 1408
Chicago, Illinois 60606
(312) 578-8400

Robert C. Taylor, Jr.                              230.77     $   11,627.91   $    75,000
300 Washington Blvd., Suite 1408
Chicago, Illinois 60606
(312) 578-8400
 
                                          ---------------  ----------------  ------------
TOTAL                                           79,384.62     $4,000,000.02   $25,800,000
</TABLE>

                                     -B1-
<PAGE>
 
                     EXHIBITS TO STOCK PURCHASE AGREEMENT
 
 
Exhibit 1  -  The Initial Business Plan
 
Exhibit 2  -  Restated Certificate of Incorporation, dated November 26, 1996 -
              Previously filed as Exhibit 3.1 to the Form S-4 Registration
              Statement on April 3, 1998.
               
Exhibit 3  -  Form of Promissory Note
 
Exhibit 4  -  Form of Executive Investor Stock Pledge Agreement -Previously
              filed as Exhibits 4.7- 4.10 to the Form S-4 Registration Statement
              on April 3, 1998. 
 
Exhibit 5  -  Bylaws Amendment - Previously filed as Exhibit 3.2 to the Form S-4
              Registration Statement on April 3, 1998. 

Exhibit 6  -  Stockholders Agreement by and among Focal, MDCP, Frontenac, BV,
              Addy, Barnicle, Beatty and Taylor - Previously filed as Exhibit
              4.11 to the Form S-4 Registration Statement on April 3, 1998.

Exhibit 7  -  Form of Executive Stock Agreement and Employment Agreement -
              Previously filed as Exhibits 4.12-4.15 to the Form S-4
              Registration Statement on April 3, 1998.

Exhibit 8  -  Registration Agreement by and among Focal, MDCP, Frontenac, BV,
              Addy, Barnicle, Beatty and Taylor - Previously filed as Exhibit
              4.16 to the Form S-4 Registration Statement on April 3, 1998.

Exhibit 9  -  Form of Vesting Agreement
 
Exhibit 10 -  Interconnection Agreement by and among Ameritech Statement on
              April 3, 1998. Information Industry Services and Focal, dated
              October 28, 1996- Previously filed as Exhibit 10.1 to the Form S-4
              Registration 
 
Exhibit 11 -  Form of Opinion of Bischoff, Kenney & Niehaus (Initial Closing)
 
Exhibit 12 -  Form of Opinion of Bischoff, Kenney & Niehaus (Subsequent
              Closings)
 
Exhibit 13 -  Form of Nondisclosure and Noncompetition Agreement

<PAGE>
 
                     EXHIBIT 1 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------

                             INITIAL BUSINESS PLAN
                             ---------------------

     The financial statements and projections attached hereto represent a 
financial model for implementing the business of the Company in the Chicago 
MSA-1 market. The Company shall use such funds contemplated hereunder 
(specifically, initial capital of $4,000,000; $8,000,000 in the aggregate) to 
obtain necessary assets (through purchase or lease), engage personnel, and take 
all actions necessary to provide facilities-based and resold, switched and 
dedicated, local exchange services in the identified market and interexchange 
services throughout Illinois.
<PAGE>

Focal Communications Corp.              Initial Business Plan
Chicago Financial Plan
9/23/96

<TABLE>
<CAPTION>
                                               Year 1            Year 2          Year 3           Year 4           Year5
<S>                                          <C>               <C>             <C>              <C>             <C>
Income Statement:
Corp/VAR acct revenue                           208,701         2,524,442       6,231,920       17,352,528      29,902,725
ISP revenue                                     592,391         4,494,017       6,394,925       17,950,505      26,749,132
Total Revenue                                   801,093         7,018,459      16,626,846       35,303,032      56,651,857
 Carrier settlements                            431,926         2,178,197       4,595,682        8,609,522      14,047,349
 Sales & customer service expense             2,707,161         4,149,763       6,829,377       10,932,858      14,072,091
 General & administrative expense               286,700           376,457         475,305          592,647         689,639
Gross Profit                                 (1,624,694)          316,022       4,726,480       15,168,006      27,842,777
 Corporate Overhead                           1,371,360         1,820,232       1,693,627        1,970,692       2,241,253
(Total Cash Expenses)                         3,797,147         8,522,669      13,793,991       22,105,718      31,060,333
EBITDA                                       (2,996,054)       (1,504,210)      2,832,853       13,197,314      25,601,524
 Depreciations & Amortization                   344,617           687,304       1,079,449        1,666,301       2,231,059
Operating income                             (3,340,671)       (2,191,514)      1,753,404       11,531,013      23,370,466
 Other income (net)                                   0                 0               0                0               0
 Interest Expense                                81,329            49,251         114,846          (53,333)        (87,979)
 Income Taxes                                         0                 0               0        2,953,540       8,445,040
Net Income                                   (3,442,000)       (2,240,755)      1,638,758        8,630,806      15,013,405

Gross margin                                        neg                 5%             28%              43%             49%
EBITDA margin                                       neg               neg              17%              37%             45%
Operating margin                                    neg               neg              11%              33%             41%

Total customers
Total lines                                       2,426             7,087          13,240           22,730          33,926
Total MOUs (millions)                              50.2             410.7           674.3           2159.4          3580.7
Total employees                                      27                43              55               74              89

Statement of Cash Flows:
Net income                                   (3,422,000)       (2,240,765)      1,638,758        8,630,806      15,013,405
Depreciation & amortization                     344,617           687,304       1,079,449        1,666,301       2,231,059
Change in working capital                        24,033           210,554         498,805        1,059,091       1,699,556
Other non-cash items                                  0                 0               0                0               0
Cash from Operations                         (3,053,350)       (1,342,907)      3,217,012       11,356,198      18,944,019

Capital expenditures                         (4,736,879)       (2,253,685)     (5,191,502)      (7,615,744)     (8,870,517)
Other investments                                     0                 0               0                0               0
Cash for investing                           (4,736,879)       (2,253,685)     (5,191,502)      (7,615,744)     (8,870,517)

Secured financing                             2,672,651         2,253,685       5,191,502                0               0
Debt repayment                                 (355,331)         (926,397)     (1,826,444)      (2,529,460)     (2,174,128)
Other debt financing                                  0                 0               0                0               0
Common A                                      6,000,000         2,000,000               0                0               0
Other equity                                          0                 0               0                0               0
Other                                                 0                 0               0                0               0
Cash from Financing                           8,317,319         3,327,288       3,365,059       (2,529,460)     (2,174,128)

Beg. cash balance                                     0           527,090         257,785        1,648,354       2,659,349
Change in cash                                  527,090          (269,305)      1,390,569        1,210,995       7,899,373
Ending Cash Balance                             527,090           257,785       1,648,354        2,859,349      10,758,722
</TABLE>

<PAGE>
 
Focal Communications Corp.              Initial Business Plan
Chicago Financial Plan
9/23/96
<TABLE> 
<CAPTION> 
                                        Year 1          Year 2          Year 3          Year 4          Year 8
<S>                                   <C>             <C>             <C>             <C>             <C> 
Cash Summary:
Cash from Operations                  (3,053,350)     (1,342,907)      3,217,012      11,356,198      16,944,019
Cash for Investing                    (4,736,879)     (2,253,885)     (5,191,502)     (7,615,744)     (8,870,517)
Net Cash Flow                         (7,790,229)     (3,596,592)     (1,974,490)      3,740,454      10,073,502
Cash from Financing                    8,317,319       3,327,288       3,365,059      (2,529,460)     (2,174,128)
Cumulative Net Cash                      527,090         257,785       1,648,354       2,859,349      10,758,722

Balance Sheet:
Cash & mkt. securities                   527,090         257,785       1,648,354       2,859,349      10,758,722
Accounts receivable                      268,493         843,030       1,787,551       2,565,788       3,897,172
Other current assets                           0               0               0               0               0
Current Assets                           795,583       1,100,816       3,435,905       5,425,137      14,655,894

Gross PPE                              4,684,369       6,592,675      10,840,120      16,167,068      20,484,404
Accum depreciation                       344,617       1,031,921       2,111,370       3,777,671       6,008,730
Net PPE                                4,339,752       5,560,754       8,728,750      12,389,397      14,475,674

Goodwill & other intangibles                   0               0               0               0               0
Other non-current assets              (1,510,236)     (2,749,367)     (5,343,769)     (3,105,690)      1,910,691
Non-current Assets                     2,829,518       2,811,387       3,384,981       9,283,707      16,386,365
Total Assets                           3,625,099       3,912,203       6,820,888      14,708,844      31,042,260

Accounts Payable                         605,635       1,018,110       1,586,689       2,521,808       3,492,442
Debt maturities                          102,258         100,604         257,077        (209,354)       (166,174)
Other accrued expenses                    50,470          84,842         132,224         210,151         291,037
Current Liabilities                      758,363       1,203,556       1,975,990       2,522,605       3,617,305

Secured debt                             238,268         286,589         736,878        (630,711)       (486,285)
Other long-term debt                           0               0               0               0               0
Other non-current liab.                   50,470          84,842         132,224         210,151         291,037
Non-Current Liabilities                  288,736         371,412         868,902        (420,560)       (195,248)

Common stock A                         6,000,000       8,000,000       8,000,000       8,000,000       8,000,000
Other common stock                             0               0               0               0               0
Additional paid-in capital                     0               0               0               0               0
Retained earnings (deficit)           (3,422,000)     (5,662,765)     (4,024,007)      4,606,799      19,620,204
Shareowners Equity                     2,578,000       2,337,235       3,975,993      12,606,799      27,620,204
Total Liabilities & Shareowners
 Equity                                3,625,099       3,912,203       6,820,886      14,708,844      31,042,260

Financial Ratios:                                                                                                
EBITDA/Cash Interest                       (36.8)          (30.5)           24.7              NA              NA 
EBITDA-Capital Cash Interest               (95.1)          (76.3)          (20.6)             NA              NA 
EBITDA/Interest                            (36.8)          (30.5)           24.7          (247.5)         (291.0)
EBITDA-Capital Interest                    (95.1)          (76.3)          (20.6)         (104.7)         (190.2)
Debt/EBITDA                                 (0.0)           (0.0)            0.0            (0.0)           (0.0)
Total Debt                               340,524         387,173         993,755        (840,065)       (652,460)
</TABLE> 

<PAGE>
 
Focal Communications Corp.      Initial Business Plan
Chicago Financial Plan
9/23/96
<TABLE> 
<CAPTION> 
                                  Year 1                                       
                                 Month 1      Month 2      Month 3      Month 4      Month 5       Month 6      Month 7     Month 8
<S>                             <C>          <C>          <C>          <C>          <C>           <C>          <C>         <C> 
Income Statement:             
Corp/VAR acct revenue                  0            0            0            0            0             0        4,575      13,988
ISP revenue                            0            0            0            0            0             0       12,855      40,379
Total Revenue                          0            0            0            0            0             0       17,430      54,367
 Carrier settlements                   0            0            0            0            0             0       33,422      49,232
 Sales & customer service                                                        
  expense                         28,986       45,112       54,640       82,010      102,573       137,080      166,816     192,035
 General & administrative                                                        
  expenses                        20,500       20,500       20,500       20,500       20,500        23,100       26,850      26,850
Gross Profit                     (49,486)     (65,612)     (75,140)    (102,510)    (123,073)     (160,180)    (209,658)   (213,750)
 Corporate Overhead               75,250       92,750      112,001      115,751      121,951       121,951      121,951     121,951
(Total Cash Expenses)            124,736      158,362      187,141      218,261      245,024       282,131      349,039     390,068
EBITDA                          (124,736)    (158,362)    (187,141)    (218,261)    (245,024)     (282,132)    (331,609)   (335,701)
 Depreciation & Amortization       4,281        6,561        8,842       11,123       31,404        33,684       35,965      38,246
Operating income                (129,017)    (164,923)    (195,983)    (229,384)    (276,427)     (315,815)    (367,574)   (373,947)
 Other income (net)                    0            0            0            0            0             0            0           0
 Interest Expense                  1,026        2,576        3,359        3,730        9,654        15,342       13,636      10,485
 Income Taxes                          0            0            0            0            0             0            0           0
Net Income                      (130,042)    (167,500)    (199,341)    (233,114)    (286,082)     (331,157)    (381,210)   (384,431)
                              
Gross margin                          NA           NA           NA           NA           NA            NA          neg         neg 
EBITDA margin                         NA           NA           NA           NA           NA            NA          neg         neg 
Operating margin                      NA           NA           NA           NA           NA            NA          neg         neg 
                              
Total customers               
Total lines                             0           0            0            0            0             0          264         619
Total MOUs (millions)                  00          00           00           00           00            00          1.0         3.2
Total employees                         7          12           15           20           23            24           27          27
                              
Statement of Cash Flows:      
Net income                       (130,042)   (167,500)    (199,341)    (233,114)    (286,062)     (331,157)    (381,210)   (384,431)
Depreciation & amortization         4,281       6,561        8,842       11,123       31,404        33,684       35,965      38,248
Change in working capital               0           0            0            0            0             0          523       1,631
Other non-cash items                    0           0            0            0            0             0            0           0 
Cash from Operations             (125,762)   (160,938)    (190,499)    (221,991)    (254,678)     (297,473)    (344,722)   (344,555)
                              
Capital expenditures             (428,073)   (228,073)    (228,073)    (228,073)  (2,028,073)     (228,073)    (228,073)   (228,073)
Other investments                       0           0            0            0            0             0            0           0 
Cash for investing               (428,073)   (228,073)    (228,073)    (228,073)  (2,028,073)     (228,073)    (228,073)   (228,073)
                              
Secured financing                 214,037     114,037      114,037      114,037    1,318,248       114,037      114,037     114,037
Debt repayment                          0      (4,459)      (6,835)      (9,211)     (11,586)      (39,050)     (41,426)    (43,801)
Other debt financing            
Common A                        4,000,000                                                                                 
Other equity                  
Other                         
Cash from Financing             4,214,037     109,578      107,202      104,826    1,306,661        74,987       72,611      70,235
                              
Beg cash balance                        0   3,660,202    3,380,768    3,069,397    2,724,159     1,748,069    1,297,510     797,326
Change in cash                  3,660,202    (279,434)    (311,371)    (345,238)    (976,090)     (450,559)    (500,184)   (502,393)
Ending Cash Balance             3,660,202   3,380,768    3,069,397    2,724,159    1,748,069     1,297,510      797,326     294,933

<CAPTION> 
                                                                        Year 1
                                 Month 9     Month 10     Month 11     Month 12
<S>                             <C>          <C>          <C>          <C>     
Income Statement:            
Corp/VAR acct revenue              25,794      39,243       54,451       70,650  
ISP revenue                        75,694     114,669      150,952      197,842
Total Revenue                     101,488     153,912      205,403      268,493
 Carrier settlements               67,276      76,199       94,127      111,669
 Sales & customer service         
  expense                         208,257     219,786      225,642      244,226 
 General & administrative     
  expenses                         26,850      26,850       26,850       26,850
Gross Profit                     (200,895)   (168,924)    (141,216)    (114,252)
 Corporate Overhead               121,951     121,951      121,951      121,951
(Total Cash Expenses)             424,334     444,787      468,570      504,696
EBITDA                           (322,848)   (290,876)    (263,167)    (238,203)
 Depreciation & Amortization       40,405      42,558       44,704       46,844
Operating income                 (363,251)   (333,432)    (307,870)    (283,047)
 Other income (net)                     0           0            0            0 
 Interest Expense                   7,737       5,755        4,437        3,592
 Income Taxes                           0           0            0            0  
Net Income                       (370,988)   (339,168)    (312,308)    (286,639)
                             
Gross margin                          neg         neg          neg          neg 
EBITDA margin                         neg         neg          neg          neg 
Operating margin                      neg         neg          neg          neg 
                              
Total customers                  
Total lines                         1,065       1,469        1,929        2,426
Total MOUs (millions)                 6.2         9.7         12.9         17.2
Total employees                        27          27           27           27
                             
Statement of Cash Flows:     
Net income                       (370,988)   (339,188)    (312,308)    (286,839)
Depreciation & amortization        40,405      42,558       44,704       46,844
Change in working capital           3,045       4,617        6,162        8,055
Other non-cash items                    0           0            0            0   
Cash from Operations             (327,539)   (292,013)    (261,442)    (231,740)
                             
Capital expenditures             (228,073)   (228,073)    (228,073)    (228,073) 
Other investments                       0           0            0            0   
Cash for investing               (228,073)   (228,073)    (228,073)    (228,073) 
                             
Secured financing                 114,037     114,037      114,037      114,037
Debt repayment                    (46,177)    (48,553)     (50,929)     (53,304)
Other debt financing            
Common A                        2,000,000
Other equity                 
Other                        
Cash from Financing             2,067,859      65,484       63,108       60,732
                             
Beg cash balance                  294,933   1,807,181    1,352,578      926,172
Change in cash                  1,512,247    (454,602)    (426,407)    (399,081)
Ending Cash Balance             1,807,181   1,352,578      926,172      527,090
</TABLE> 

<PAGE>
 
FOCEL COMMUNICATIONS CORP.           INITIAL BUSINESS PLAN
CHICAGO FINANCIAL PLAN
9/23/96                                

<TABLE> 
<CAPTION> 
                                       YEAR 1
                                       Month 1       Month 2       Month 3       Month 4       Month 5       Month 6
<S>                                    <C>           <C>           <C>           <C>           <C>           <C> 
Cash Summary:
Cash from Operations                   (125,762)     (160,938)     (190,499)     (221,991)     (254,678)     (297,473)
Cash for investing                     (428,073)     (228,073)     (228,073)     (228,073)   (2,028,073)     (228,073)
Net Cash Flow                          (553,835)     (389,011)     (418,573)     (450,064)   (2,282,751)     (525,546)
Cash from Financin                    4,214,037       109,578       107,202       104,826     1,306,661        74,987
Cumulative Net Cash                   3,660,202     3,380,768     3,069,397     2,724,159     1,748,069     1,297,510

Balance Sheet:
Cash & mid securites                  3,660,202     3,380,768     3,069,397     2,724,159     1,748,069     1,297,510
Accounts Receivable                           0             0             0             0             0             0
Other Current Assets                          0             0             0             0             0             0
Current Assets                        3,660,202     3,380,768     3,069,397     2,724,159     1,748,069     1,297,510

Gross PPE                               428,073       656,147       884,220     1,112,293     3,140,366     3,368,440
Accum. Depreciation                       4,281        10,842        19,684        30,807        62,211        95,895
Net PPE                                 423,793       645,304       864,535     1,081,486     3,078,155     3,272,544

Goodwill & other intangibles                  0             0             0             0             0              0
Other non-current Assets                174,630       221,707        208,488      171,152        114,294        65,936
Non-current Assets                      598,423       867,011      1,073,023    1,252,638     3,192,449      3,338,480
Total Assets                          4,258,625     4,247,779      4,142,420    3,976,797     4,940,518      4,635,990

Accounts Payable                        149,683       190,034        224,569      261,913       294,028        338,557
Debt maturities                               0        53,509         80,904       94,327       100,307        403,391
Other accrued expenses                   12,474        15,836         18,714       21,828        24,502         28,213
Current Liabilities                     162,157       259,380        324,186      378,066       418,838        770,161

Secured Debt                           214,037        270,105        296,403      306,903     1,513,256      1,184,852
Other long-term debt                         0              0              0            0             0              0
Other non-current liab                  12,474         15,836         18,714       21,826        24,502         28,213
Non-current Liabilities                226,510        285,941        315,117      328,729     1,537,759      1,213,065

Common stock A                       4,000,000      4,000,000      4,000,000    4,000,000     4,000,000      4,000,000
Other common stock                           0              0              0            0             0              0 
Additional paid-in capital                   0              0              0            0             0              0
Retained earnings (deficit)           (130,042)      (297,542)      (496,883)    (729,997)   (1,016,079)    (1,347,236)
Shareowners Equity                   3,869,958      3,702,458      3,503,117    3,270,003     2,983,921      2,652,764
Total Liab & Shareowners Equity      4,258,625      4,247,779      4,142,420    3,976,797     4,940,518      4,635,990

Financial Ratios:
EBITDA/Cash Interest                    (121.6)         (61.5)         (55.7)       (58.5)        (25.4)         (18.4)
EBITDA-Capex/Cash Interest              (539.0)        (150.0)        (123.6)      (119.6)       (235.5)         (33.3)
EBITDA/Interest                         (121.6)         (61.5)         (55.7)       (58.5)        (25.4)         (18.4)
EBITOA-Capex/Cash Interest              (539.0)        (150.0)        (123.6)      (119.6)       (235.5)         (33.3)
Debt/EBITDA                               (0.1)          (0.2)         (0.2)         (0.2)         (0.5)          (0.5)
    
<CAPTION> 
                                                                                                              Year 1
                                       Month 7       Month 8       Month 9       Month 10      Month 11      Month 12
<S>                                    <C>           <C>           <C>           <C>           <C>           <C> 
Cash Summary:
Cash from Operations                   (344,722)     (344,555)     (327,539)     (292,013)     (261,442)     (231,740)
Cash for investing                     (228,073)     (228,073)     (228,073)     (228,073)     (228,073)     (228,073)
Net Cash Flow                          (572,795)     (572,628)     (555,612)     (520,086)     (489,515)     (459,814)
Cash from Financin                       72,611        70,235     2,067,859        65,484        63,108        60,732
Cumulative Net Cash                     797,326       294,933     1,807,181     1,352,578       926,172       527,090

Balance Sheet:
Cash & mid securites                    797,326       294,933     1,807,181     1,352,578       926,172       527,090
Accounts Receivable                      17,430        54,367       101,488       153,912       205,403       268,493
Other Current Assets                          0             0             0             0             0             0
Current Assets                          814,756       349,300     1,908,669     1,506,490     1,131,575       795,583

Gross PPE                             3,596,513     3,824,586     4,040,501     4,255,769     4,470,391     4,684,369
Accum. Depreciation                     131,861       170,106       210,511       253,069       297,773       344,617
Net PPE                                3,464,652    3,654,480     3,829,990     4,002,700     4,172,618     4,339,752

Goodwill & other intangibles                  0             0             0             0             0              0
Other non-current Assets               (261,736)     (639,924)      (944,325)  (1,192,587)   (1,374,525)    (1,510,236)
Non-current Assets                    3,202,916     3,014,555      2,885,665    2,810,113     2,798,093      2,829,516
Total Assets                          4,017,672     3,363,855      4,794,334    4,316,603     3,929,668      3,625,099

Accounts Payable                        418,846       468,081        509,201      533,744       562,284        605,635
Debt maturities                         397,061       314,366        232,659      171,033       129,239        102,258
Other accrued expenses                   34,904        39,007         42,433       44,479        46,857         50,470
Current Liabilities                     850,811       821,454        784,294      749,255       738,380        758,363

Secured Debt                           860,402        616,272        451,472      345,923       279,792        238,266
Other long-term debt                         0              0              0            0             0              0
Other non-current liab                  34,904         39,007         42,433       44,479        46,857         50,470
Non-current Liabilities                895,306        655,279        493,905      390,401       326,649        288,736

Common stock A                       4,000,000      4,000,000      6,000,000    6,000,000     6,000,000      6,000,000
Other common stock                           0              0              0            0             0              0 
Additional paid-in capital                   0              0              0            0             0              0
Retained earnings (deficit)         (1,728,446)    (2,112,877)    (2,483,866)  (2,823,053)   (3,135,361)    (3,422,000)
Shareowners Equity                   2,271,554      1,887,123      3,516,134    3,176,947     2,864,639      2,578,000
Total Liab & Shareowners Equity      4,017,672      3,363,855      4,794,334    4,316,603     3,928,668      3,825,000

Financial Ratios:
EBITDA/Cash Interest                     (24.3)         (32.0)         (41.7)       (50.5)        (59.3)         (65.8)
EBITDA-Capex/Cash Interest               (41.0)         (53.8)         (71.2)       (90.2)       (110.7)        (129.3)
EBITDA/Interest                          (24.3)         (32.0)         (41.7)       (50.5)        (59.3)         (65.8)
EBITOA-Capex/Cash Interest               (41.0)         (53.8)         (71.2)       (90.2)       (110.7)        (129.3)
Debt/EBITDA                               (0.3)          (0.2)         (0.2)         (0.1)         (0.1)          (0.1)
</TABLE> 
    

<PAGE>
 
Focal Communications Corp.                      Initial Business Plan
Chicago Financial Plan
9/23/96

<TABLE> 
<CAPTION> 

                                        Year 2
                                       Month 13    Month 14    Month 15    Month 16    Month 17    Month 18    Month 19    Month 20
<S>                                    <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C> 
Income Statement:                        
Corp/VAR acct revenue                    93,163     110,249     129,314     148,541     168,614     191,320     214,176     238,277
ISP revenue                             247,728     281,793     314,541     329,810     343,781     359,312     389,796     407,397
Total Revenue                           340,891     392,042     443,856     478,351     512,595     550,632     603,972     645,674
 Carrier settlements                    117,265     128,004     143,166     145,160     157,212     172,847     186,496     191,738
 Sales & customer service expense       323,718     309,271     316,260     304,864     310,872     338,990     361,521     356,398
 General & administrative expenses       28,075      29,075      29,075      29,075      29,075      33,012      33,012      33,012
Gross Profit                           (129,167)    (74,307)    (44,645)       (748)     15,437       5,783      22,942      64,526
 Corporate Overhead                     151,686     151,686     151,686     151,686     151,686     151,686     151,686     151,686
(Total Cash Expenses)                   621,744     618,035     640,187     630,785     648,844     696,535     732,715     732,834
EBITDA                                 (280,683)   (225,993)   (196,331)   (152,434)   (136,249)   (145,903)   (128,744)    (87,160)
 Depreciation & Amortization             48,478      50,104      51,723      53,333      54,935      56,529      58,115      59,693
Operating income                       (329,331)   (276,097)   (248,054)   (205,767)   (191,183)   (202,432)   (186,659)   (146,852)
 Other income (net)                           0           0           0           0           0           0           0           0
 Interest Expense                         3,406       3,756       4,114       4,348       4,454       4,465       4,411       4,317
 Income Taxes                                 0           0           0           0           0           0           0           0
Net Income                             (332,738)   (279,853)   (252,168)   (210,114)   (195,638)   (205,896)   (191,270)   (151,170)
                                             
Gross margin                                neg         neg         neg         neg          3%          1%          4%         10%
EBITDA margin                               neg         neg         neg         neg         neg         neg         neg         neg
Operating margin                            neg         neg         neg         neg         neg         neg         neg         neg
                                             
Total customers                              
Total lines                               2,896       3,322       3,750       4,032       4,328       4,640       5,113       5,464
Total MOUs (millions)                      21.0        24.3        27.4        29.7        31.2        32.8        25.3        37.8
Total employees                              39          39          39          39          39          43          43          43
                                             
Statement of Cash Flows:                     
Net income                             (332,738)   (279,853)   (252,168)   (210,114)   (195,638)   (206,896)   (191,270)   (151,170)
Depreciation & amortization              48,478      50,104      51,723      53,333      54,935      56,529      58,115      59,693
Change in working capital                10,227      11,761      13,316      14,351      15,378      16,519      18,119      19,370
Other non-cash items                          0           0           0           0           0           0           0           0
Cash from Operations                   (274,033)   (217,988)   (187,130)   (142,431)   (125,325)   (133,849)   (115,036)    (72,107)
                                             
Capital expenditures                   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)
Other investments                             0           0           0           0           0           0           0           0
Cash for investing                     (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)   (187,807)
                                             
Secured financing                       187,807     187,807     187,807     187,807     187,807     187,807     187,807     187,807
Debt repayment                          (55,680)    (59,593)    (63,506)    (67,418)    (71,331)    (75,243)    (79,156)    (83,069)
Other debt financing                         
Common A                              2,000,000
Other equity                                 
Other                                        
Cash from Financing                   2,132,127     128,214     124,302     120,389     116,476     112,564     108,651     104,738

Beg cash balance                        527,090   2,197,377   1,919,796   1,669,161   1,459,312   1,262,656   1,053,564     859,372
Change in cash                        1,670,287    (277,580)   (250,635)   (209,849)   (196,656)   (209,092)   (194,192)   (155,176)
Ending Cash Balance                   2,197,377   1,919,796   1,669,161   1,459,312   1,262,656   1,053,564     859,372     704,196

<CAPTION> 

                                                                            Year 2
                                       Month 21    Month 22    Month 23    Month 24
<S>                                    <C>         <C>         <C>         <C> 
Income Statement:                      
Corp/VAR acct revenue                   264,823     291,944     321,672     352,148  
ISP revenue                             425,248     442,807     460,921     490,882  
Total Revenue                           690,071     734,751     782,593     843,030  
 Carrier settlements                    208,956     224,383     241,956     259,013  
 Sales & customer service expense       365,907     373,321     383,948     404,713  
 General & administrative expenses       33,012      33,012      33,012      33,012  
Gross Profit                             82,197     104,035     123,677     146,292  
 Corporate Overhead                     151,686     151,686     151,686     151,686  
(Total Cash Expenses)                   759,561     782,402     810,602     848,425  
EBITDA                                  (69,489)    (47,651)    (28,009)     (5,394) 
 Depreciation & Amortization             61,263      62,825      64,380      65,927  
Operating income                       (130,752)   (110,477)    (92,389)    (71,321) 
 Other income (net)                           0           0           0           0  
 Interest Expense                         4,200       4,068       3,928       3,783  
 Income Taxes                                 0           0           0           0  
Net Income                             (134,952)   (114,545)    (96,317)    (75,104)  
                                       
Gross margin                                 12%         14%         16%         17%
EBITDA margin                                neg         neg         neg         neg
Operating margin                             neg         neg         neg         neg 
                                   
Total customers                        
Total lines                               5,835       6,224       6,635       7,067 
Total MOUs (millions)                      39.7        41.7        43.8        46.0   
Total employees                              43          43          43          43  
                                  
Statement of Cash Flows:          
Net income                             (134,952)   (114,545)    (96,317)    (75,104) 
Depreciation & amortization              61,263      62,825      64,380      65,927 
Change in working capital                20,702      22,043      23,478      25,291 
Other non-cash items                          0           0           0           0
Cash from Operations                    (52,987)    (29,677)     (8,459)     16,113 
                                  
Capital expenditures                   (187,807)   (187,807)   (187,807)   (187,807)    
Other investments                             0           0           0           0    
Cash for investing                     (187,807)   (187,807)   (187,807)   (187,807)    
                                  
Secured financing                       187,807     187,807     187,807     187,807  
Debt repayment                          (86,981)    (90,894)    (94,807)    (98,719)
Other debt financing              
Common A                            
Other equity                      
Other                             
Cash from Financing                     100,826      96,913      93,000      89,088

Beg cash balance                        704,196     564,228     443,657     340,391
Change in cash                         (139,968)   (120,571)   (103,266)    (82,606)
Ending Cash Balance                     564,228     443,657     340,391     257,785

</TABLE> 
<PAGE>
 
Focal Communication Corp.               Initial Business Plan
Chicago Financial Plan
9/23/96

<TABLE> 
<CAPTION> 
                                 Year 2                          
                                 Month 13        Month 14        Month 15        Month 16        Month 17       Month 18          
<S>                             <C>             <C>             <C>             <C>             <C>             <C>              
Cash Summary:
Cash from Operations             (274,033)       (217,988)       (187,130)       (142,431)       (125,325)       (133,849)
Cash for Investing               (187,807)       (187,807)       (187,807)       (187,807)       (187,807)       (187,807)
Net Cash Flow                    (461,840)       (405,795)       (374,937)       (330,238)       (313,132)       (321,656)
Cash from Financing             2,132,127         128,214         124,302         120,389         116,476         112,564
Cumulative Net Cash             2,197,377       1,919,796       1,669,161       1,459,312       1,262,656       1,053,564

Balance Sheet:
Cash & mkt securities           2,197,377       1,919,796       1,669,161       1,459,312       1,262,656       1,053,564
Accounts receivable               340,891         392,042         443,856         478,351         512,595         550,632
Other current assets                    0               0               0               0               0               0
Current Assets                  2,538,267       2,311,839       2,113,017       1,937,663       1,775,251       1,604,196


Gross PPE                       4,847,815       5,010,444       5,172,260       5,333,266       5,493,468       5,652,869
Accum depreciation                393,095         443,199         494,922         548,255         603,189         659,718
Net PPE                         4,454,720       4,567,245       4,677,338       4,785,012       4,890,279       4,993,151

Goodwill & other intangibles            0               0               0               0               0               0
Other non-current assets       (1,506,890)     (1,634,948)     (1,735,672)     (1,874,249)     (1,982,279)     (2,057,210)
Non-current Assets              2,947,830       2,932,296       2,941,665       2,910,763       2,908,000       2,935,941
Total Assets                    5,486,097       6,244,135       5,054,682       4,848,426       4,683,252       4,540,137

Accounts Payable                  746,093         741,642         768,224         756,942         778,613         835,842
Debt maturities                    85,131          92,598         103,369         111,295         115,550         116,845
Other accured expense              62,174          61,804          64,019          63,079          64,884          69,654
Current Liabilities               893,398         896,044         935,612         931,316         959,047       1,022,341

Secured debt                      285,262         320,878         341,811         350,905         351,831         347,549
Other long-term debt                    0               0               0               0               0               0
Other non-current liab             62,174          61,804          64,019          63,079          64,884          69,654
Non-Current Liabilities           347,437         382,682         405,829         413,983         416,715         417,203

Common stock A                  8,000,000       8,000,000       8,000,000       8,000,000       8,000,000       8,000,000
Other common stock                      0               0               0               0               0               0
Additional paid-in-capital              0               0               0               0               0               0
Retained earnings (deficit)    (3,754,737)     (4,034,591)     (4,285,759)     (4,496,873)     (4,692,511      (4,899,407)
Shareowners Equity              4,245,263       3,965,409       3,713,241       3,503,127       3,307,489       3,100,593
Total Liabilities & 
 Shareowners Equity             5,486,097       5,244,135       6,054,682       4,848,426       4,683,252       4,540,137

Financial Ratios:
EBITDA/Cash Interest                 (82.4)          (60.2)          (47.7)           (35.1)          (30.6)         (32.7)
EBITDA-Caper/Cash Interest          (137.6)         (110.2)          (93.4)           (78.3)          (72.8)         (74.7)
EBITDA/Interest                      (82.4)          (60.2)          (47.7)           (35.1)          (30.6)         (32.7)
EBITDA-Capex/Interest               (137.6)         (110.2)          (93.4)           (78.3)          (72.8)         (74.7)
Debt/EBITDA                           (0.1)           (0.2)          (0.2)            (0.3)           (0.3)          (0.3)      

<CAPTION> 
                                 Year 2                          
                                 Month 19        Month 20        Month 21        Month 22        Month 23       Month 24          
<S>                             <C>             <C>             <C>             <C>             <C>             <C>              
Cash Summary:
Cash from Operations             (115,036)       ( 72,107)       ( 52,987)       ( 29,677)         (8,459)         16,113 
Cash for Investing               (187,807)       (187,807)       (187,807)       (187,807)       (187,807)       (187,807)
Net Cash Flow                    (302,843)       (259,914)       (240,794)       (217,484)       (196,266)       (171,694)
Cash from Financing               108,651         104,738         100,826          96,913          93,000          89,088
Cumulative Net Cash               859,372         704,196         564,228         443,657         340,391         257,785

Balance Sheet:
Cash & mkt securities             859,372         704,196         564,228         443,657         340,391         257,785
Accounts receivable               603,972         645,674         690,071         734,751         782,593         843,030
Other current assets                    0               0               0               0               0               0
Current Assets                  1,463,343       1,349,871       1,254,299       1,178,408       1,122,984       1,100,816


Gross PPE                       5,811,473       5,969,283       6,126,305       6,282,541       6,437,997       6,592,675
Accum depreciation                717,833         777,525         838,789         901,614         965,994       1,031,921
Net PPE                         5,093,640       5,191,758       5,287,516       5,380,927       5,472,003       5,560,754

Goodwill & other intangibles            0               0               0               0               0               0
Other non-current assets       (2,165,658)     (2,312,668)     (2,423,614)     (2,537,997)     (2,645,389)     (2,749,367)
Non-current Assets              2,927,982       2,879,090       2,863,903       2,842,930       2,826,613       2,811,387
Total Assets                    4,391,325       4,228,961       4,118,202       4,021,339       3,949,598       3,912,203

Accounts Payable                  879,258         879,401         911,473         930,883         972,722       1,018,110
Debt maturities                   116,099         114,050         111,210         107,904         104,330         100,604
Other accured expense              73,272          73,283          75,956          78,240          81,060          84,842
Current Liabilities             1,069,629       1,066,734       1,098,639       1,125,027       1,158,112       1,203,556

Secured debt                      340,102         330,790         320,406         309,415         298,085         266,569
Other long-term debt                    0               0               0               0               0               0
Other non-current liab             73,272          73,283          75,956          78,240          81,060          84,842
Non-Current Liabilities           413,373         404,073         396,362         387,655         379,146         371,412

Common stock A                  8,000,000       8,000,000       8,000,000       8,000,000       8,000,000       8,000,000
Other common stock                      0               0               0               0               0               0
Additional paid-in-capital              0               0               0               0               0               0
Retained earnings (deficit)    (5,090,677)     (5,241,847)     (5,376,799)     (5,491,343)     (5,587,660)     (5,662,765)
Shareowners Equity              2,909,323       2,758,153       2,623,201       2,508,657       2,412,340       2,337,235
Total Liabilities & 
 Shareowners Equity             4,301,325       4,228,961       4,118,202       4,021,339       3,946,598       3,912,203

Financial Ratios:
EBITDA/Cash Interest                 (29.2)          (20.2)          (16.5)           (11.7)          (7.1)          (1.4) 
EBITDA-Caper/Cash Interest           (71.8)          (63.7)          (61.3)           (57.9)          (54.9)         (51.1)
EBITDA/Interest                      (29.2)          (20.2)          (16.5)           (11.7)          (7.1)          (1.4)
EBITDA-Capex/Interest                (71.8)          (63.7)          (61.3)           (57.9)          (54.9)         (51.1)
Debt/EBITDA                           (0.3)           (0.4)          (0.5)            (0.7)           (1.2)          (6.0)      
</TABLE> 
s
<PAGE>
 
<TABLE> 
<CAPTION> 
 
Focal Communications Corp.               Initial Business Plan
Chicago Financial Plan
9/23/96                                Year 3
                                      Month 25        Month 26       Month 27        Month 28        Month 29        Month 30
<S>                                  <C>             <C>            <C>             <C>             <C>             <C> 
Income Statement:                       
Corp/VAR acct revenue                   475,218         508,798        543,624         580,873         618,646         657,821 
ISP revenue                             547,717         572,672        595,559         620,327         645,055         670,600 
Total Revenue                         1,022,935       1,081,470      1,139,184       1,201,200       1,263,701       1,328,421
 Carrier settlements                    284,021         292,895        309,464         329,449         347,570         366,250 
 Sales & customer service expense       618,718         505,566        513,294         526,278         535,573         547,581 
 General & administrative expenses       39,609          39,609         39,609          39,609          39,609          39,609
Gross Profit                             80,588         243,400        276,817         306,864         340,949         374,982  
 Corporate Overhead                     157,802         157,802        157,802         157,802         157,802         157,802 
(Total Cash Expenses)                 1,100,150         995,873      1,020,169       1,053,138       1,080,554       1,111,241   
EBITDA                                  (77,214)         86,597        119,015         148,062         183,147         217,180 
 Depreciation & Amortization             70,253          74,579         78,116          81,618          85,085          88,517
Operating income                       (147,467)         11,018         40,898          66,444          98,062         126,663 
 Other income (net)                           0               0              0               0               0               0
 Interest Expense                         4,810           6,983          8,813          10,014          10,671          10,941
 Income Taxes                                 0               0              0               0               0               0
Net Income                             (152,277)          4,035         32,085          56,430          87,391         117,722 
                                                        
Gross margin                                  8%             23%            24%             25%            27%              28%
EBITDA margin                               neg               8%            10%             12%            14%              16%    
Operating margin                            neg               1%             4%              6%             8%              10%    
                                             
Total customers                             
Total lines                               7,602           8,014          8,442           8,888          9,352            9,834
Total MOUs (millions)                       54.6            58.0           60.8            63.7           66.7             69.9
Total employees                              55              55             55              55             55               55
                                             
Statement of Cash Flows:                    
Net income                             (152,277)          4,035         32,085          56,430         87,391          117,722
Depreciation & amortization              70,253          74,579         78,116          81,618         85,085           88,517
Change in working capital                30,688          32,444         34,176          36,036         37,911           39,853
Other non-cash items                          0               0              0               0              0                0
Cash from Operations                    (51,336)        111,058        144,377         174,084        210,387          246,091
                                             
Capital expenditures                   (432,625)       (432,625)      (432,625)       (432,625)      (432,625)        (432,625)     
Other investments                             0               0              0               0              0                0
Cash for investing                     (432,625)       (432,625)      (432,625)       (432,625)      (432,625)        (432,625) 
                                             
Secured financing                       432,625         432,625        432,625         432,625        432,625          432,625
Debt repayment                         (102,632)       (111,645)      (120,658)       (129,671)      (138,684)         147,697
Other debt financing                         
Common A                                     
Other equity                                 
Other                                        
Cash from Financing                     329,993         320,980        311,967         302,954        293,941          284,928

Beg cash balance                        257,785         103,817        103,231         126,950        171,362          243,065
Change in cash                         (153,968)           (587)        23,719          44,413         71,703           98,394
Ending Cash Balance                     103,817         103,231        126,950         171,362        243,055          341,460


<CAPTION> 
Focal Communications Corp.               Initial Business Plan
Chicago Financial Plan
9/23/96                                                                                                               Year 3
                                      Month 31        Month 32       Month 33        Month 34        Month 35        Month 36
<S>                                  <C>             <C>            <C>             <C>             <C>             <C> 
Income Statement:                       
Corp/VAR acct revenue                   699,581         742,033        786,063         829,148         872,615         917,499 
ISP revenue                             712,924         743,930        774,210         804,647         837,231         870,052 
Total Revenue                         1,412,505       1,485,963      1,560,273       1,833,795       1,709,846       1,787,551
 Carrier settlements                    397,111         410,279        432,727         452,880         475,510         497,526 
 Sales & customer service expense       577,379         577,197        588,727         598,849         612,912         627,304 
 General & administrative expenses       39,609          39,609         39,609          39,609          39,609          39,609
Gross Profit                            398,406         458,879        499,211         542,457         581,815         623,112  
 Corporate Overhead                     157,802         157,802        157,802         157,802         157,802         157,802 
(Total Cash Expenses)                 1,171,901       1,184,887      1,218,865       1,249,140       1,285,833       1,322,241   
EBITDA                                  240,604)        301,076        341,408         384,655         424,013         465,310 
 Depreciation & Amortization             91,915          95,279         98,609         101,906         105,170         108,401
Operating income                        148,689         205,797        242,799         282,749         318,843         356,909 
 Other income (net)                           0               0              0               0               0               0
 Interest Expense                        10,961          10,827         10,601          10,323          10,014           9,689
 Income Taxes                                 0               0              0               0               0               0
Net income                              137,728         194,971        232,198         272,426         308,829         347,220 
                                                        
Gross margin                                 28%             31%            32%             33%            34%              35%
EBITDA margin                                17%             20%            22%             24%            25%              26%    
Operating margin                             11%             14%            16%             17%            19%              20%    
                                             
Total customers                             
Total lines                              10,479          11,006         11,554          12,096         12,658           13,240
Total MOUs (millions)                       73.8            78.0           81.6            85.3           89.0             92.9
Total employees                              55              55             55              55             55               55
                                             
Statement of Cash Flows:                    
Net income                              137,728         194,971        232,198         272,426        308,829          347,220
Depreciation & amortization              91,915          95,279         98,609         101,906        105,170          108,401
Change in working capital                42,375          44,579         46,808          49,014         51,295           53,627
Other non-cash items                          0               0              0               0              0                0
Cash from Operations                    272,018         334,829        377,616         423,346        465,294          509,248
                                             
Capital expenditures                   (432,625)       (432,625)      (432,625)       (432,625)      (432,625)        (432,625)     
Other investments                             0               0              0               0              0                0
Cash for investing                     (432,625)       (432,625)      (432,625)       (432,625)      (432,625)        (432,625) 
                                             
Secured financing                       432,625         432,625        432,625         432,625        432,625          432,625
Debt repayment                         (156,710)       (165,723)      (174,736)       (183,749)      (192,762)        (201,775)
Other debt financing                         
Common A                                     
Other equity                                 
Other                                        
Cash from Financing                     275,915         266,902        257,889         248,876        239,863          230,850

Beg cash balance                        341,460         456,768        625,873         828,753      1,068,350        1,340,882
Change in cash                          115,308         169,106        202,879         239,597        272,532          307,472
Ending Cash Balance                     456,768         625,873        828,753       1,068,350      1,340,882        1,648,354
</TABLE> 
<PAGE>

<TABLE>
<CAPTION>

Focal Communications Corp.                         Initial Business Plan
Chicago Financial Plan
9/23/96                                               Year 3
                                                     Month 25    Month 26     Month 27     Month 28     Month 29     Month 30
<S>                                               <C>          <C>          <C>          <C>          <C>          <C>

Cash Summary:
Cash from Operations                                 (51,336)     111,058      144,377      174,084      210,387      246,091
Cash for investing                                  (432,625)    (432,625)    (432,625)    (432,625)    (432,625)    (432,625)
Net Cash Flow                                       (483,961)    (321,567)    (288,248)    (258,541)    (222,238)    (186,534)
Cash from Financing                                  329,993      320,980      311,967      302,954      293,941      284,928
Cumulative Net Cash                                  103,817      103,231      126,950      171,362      243,065      341,460

Balance Sheet:
Cash & mkt securities                                103,817      103,321      126,950      171,362      243,065      341,460
Accounts receivable                                1,022,935    1,081,470    1,139,184    1,201,200    1,263,701    1,328,421
Other current assets                                       0            0            0            0            0            0
Current Assets                                     1,126,753    1,184,701    1,266,133    1,372,562    1,506,766    1,669,681

Gross PPE                                          7,025,300    7,457,925    7,811,645    8,161,827    8,508,508    8,851,722
Accum depreciation                                 1,102,174    1,176,753    1,254,869    1,336,488    1,421,573    1,510,090
Net PPE                                            5,923,126    6,281,172    6,556,776    6,825,340    7,086,935    7,341,632

Goodwill & other intangibles                               0            0            0            0            0            0
Other non-current assets                          (2,708,149)  (3,041,908)  (3,175,018)  (3,354,658)  (3,580,387)  (3,825,422)
Non-current Assets                                 3,214,978    3,239,264    3,381,757    3,470,681    8,506,548    3,516,210
Total Assets                                       4,341,731    4,423,965    4,647,891    4,843,244    5,013,314    5,186,091

Accounts Payable                                   1,320,180    1,195,047    1,224,203    1,263,765    1,296,665    1,333,490
Debt maturities                                       96,793      154,141      210,187      249,644      272,836      283,910
Other accrued expenses                               110,015       99,587      102,017      105,314      108,055      111,124
Current Liabilities                                1,526,988    1,448,775    1,536,407    1,618,723    1,677,556    1,728,524

Secured debt                                         519,769      686,609      788,389      841,699      862,804      863,822
Other long-term debt                                       0            0            0            0            0            0
Other non-current liab                               110,015       99,587      102,017      105,314      108,055      111,124
Non-Current Liabilities                              629,784      786,196      890,406      947,013      970,860      974,946

Common stock A                                     8,000,000    8,000,000    8,000,000    8,000,000    8,000,000    8,000,000
Other common stock                                         0            0            0            0            0            0
Additional paid-in capital                                 0            0            0            0            0            0
Retained earnings (deficit)                       (5,815,042)  (5,811,007)  (5,778,922)  (5,722,492)  (5,635,101)  (5,517,380)
Shareowners Equity                                 2,184,958    2,188,993    2,221,078    2,277,508    2,364,899    2,482,620
Total Liabilities & Shareowners Equity             4,341,731    4,423,965    4,647,891    4,843,244    5,013,314    5,186,091

EBITDA/Cash Interest Ratios:                           (16.1)        12.3         13.5         14.8         17.2         19.8
EBITDA-Capex/Cash Interest                            (106.0)       (49.7)       (35.6)       (28.4)       (23.4)       (19.7)
EBITDA/Interest                                        (16.1)        12.3         13.5         14.8         17.2         19.8
EBITDA-Capex/Internet                                 (106.0)       (49.7)       (35.6)       (28.4)       (23.4)       (19.7)
Debt/EBITDA                                             (0.7)         0.8          0.7          0.6          0.5          0.4


<CAPTION>

Focal Communications Corp.                         Initial Business Plan
Chicago Financial Plan
9/23/96                                                                                                               Year 3
                                                     Month 31    Month 32     Month 33     Month 34     Month 35     Month 36
<S>                                               <C>          <C>          <C>          <C>          <C>          <C>

Cash Summary:
Cash from Operations                                 272,018)     334,829      377,616      423,346      465,294      509,248
Cash for investing                                  (432,625)    (432,625)    (432,625)    (432,625)    (432,625)    (432,625)
Net Cash Flow                                       (160,607)     (97,797)     (55,010)      (9,279)      32,669       76,622
Cash from Financing                                  275,915      266,902      257,889      248,876      239,663      230,850
Cumulative Net Cash                                  456,768      625,873      828,753    1,068,350    1,340,882    1,648,354

Balance Sheet:
Cash & mkt securities                                456,768      625,873      828,753    1,068,350    1,340,882    1,648,354
Accounts receivable                                1,412,505    1,485,963    1,560,273    1,633,795    1,709,846    1,787,551
Other current assets                                       0            0            0            0            0            0
Current Assets                                     1,869,273    2,111,836    2,389,026    2,702,145    3,050,728    3,435,905

Gross PPE                                          9,191,504    9,527,888    9,860,906   10,190,596   10,516,990   10,840,120
Accum depreciation                                 1,602,005    1,697,284    1,795,893    1,897,799    2,002,969    2,111,370
Net PPE                                            7,589,499    7,830,604    6,065,015    8,292,799    8,514,022    8,728,750

Goodwill & other intangibles                               0            0            0            0            0            0
Other non-current assets                          (4,058,024)  (4,348,573)  (4,607,451)  (4,864,593)  (5,107,502)  (5,343,769)
Non-current Assets                                 3,531,475    3,482,031    3,457,564    3,428,206    3,406,520    3,365,981
Total Assets                                       5,400,748    5,593,867    5,846,590    6,130,351    6,457,248    6,820,886

Accounts Payable                                   1,406,282    1,421,864    1,462,638    1,498,968    1,543,000    1,586,689
Debt maturities                                      286,933      284,934      279,927      273,165      265,403      257,077
Other accrued expenses                               117,190      118,489      121,886      124,914      128,583      132,224
Current Liabilities                                1,810,405    1,825,287    1,864,451    1,897,047    1,936,986    1,975,990

Secured debt                                         852,804      834,772      812,734      788,445      762,906      736,678
Other long-term debt                                       0            0            0            0            0            0
Other non-current liab                               117,190      118,489      121,886      124,914      128,583      132,224
Non-Current Liabilities                              969,994      953,261      934,621      913,359      891,489      868,902

Common stock A                                     8,000,000    8,000,000    8,000,000    8,000,000    8,000,000    8,000,000
Other common stock                                         0            0            0            0            0            0
Additional paid-in capital                                 0            0            0            0            0            0
Retained earnings (deficit)                       (5,379,651)  (5,184,680)  (4,952,482)  (4,680,056)  (4,371,227)  (4,024,007)
Shareowners Equity                                 2,620,349    2,815,320    3,047,518    3,319,944    3,628,773    3,975,993
Total Liabilities & Shareowners Equity             5,400,748    5,593,867    5,846,590    6,130,351    6,457,248    6,820,886

EBITDA/Cash Interest Ratios:                            22.0         27.8         32.2         37.3         42.3         48.0
EBITDA-Capex/Cash Interest                             (17.5)       (12.2)        (8.6)        (4.6)        (0.9)         3.4
EBITDA/Interest                                         22.0         27.8         32.2         37.3         42.3         46.0
EBITDA-Capex/Internet                                  (17.5)       (12.2)        (8.6)        (4.6)        (0.9)         3.4
Debt/EBITDA                                             (0.4)         0.3          0.3          0.2          0.2          0.2
</TABLE>

<PAGE>
 
<TABLE> 
<CAPTION> 
Focal Communications Corp.                      Initial Business Plan
Chicago Financial Plan
9/23/96                                 Year 4
                                       Month 37    Month 38    Month 39    Month 40    Month 41    Month 42    Month 43  
<S>                                   <C>         <C>         <C>         <C>         <C>         <C>         <C>        
Income Statement:                                                                                                        
Corp/VAR acct revenue                 1,075,998   1,135,318   1,197,435   1,260,448   1,329,886   1,398,540   1,467,493  
ISP revenue                           1,193,032   1,245,673   1,295,504   1,346,238   1,399,894   1,455,720   1,526,037  
Total Revenue                         2,269,030   2,380,991   2,492,938   2,606,686   2,729,780   2,854,261   2,993,530  
 Carrier settlements                    552,010     571,376     601,494     629,887     664,119     695,353     733,959  
 Sales & customer service expense     1,146,258     790,326     804,612     820,914     844,793     878,076     908,064  
 General & administrative expenses       46,855      46,855      46,855      46,855      46,855      51,196      51,196  
Gross Profit                            523,907     972,434   1,039,077   1,109,030   1,174,013   1,229,636   1,300,312  
 Corporate Overhead                     164,224     164,224     164,224     164,224     164,224     164,224     164,224  
(Total Cash Expenses)                 1,909,348   1,572,781   1,617,185   1,661,880   1,719,991   1,788,849   1,857,443  
EBITDA                                  359,682     808,210     875,763     944,806   1,009,789   1,065,412   1,136,088  
 Depreciation & Amortization            113,600     118,747     123,843     128,887     133,205     137,458     141,646  
Operating income                        246,082     689,462     751,910     815,918     876,584     927,953     994,440  
 Other income (net)                           0           0           0           0           0           0           0  
 Interest Expense                         7,282       2,839      (1,001)     (3,731)     (5,501)     (6,588)     (7,233) 
 Income Taxes                                 0           0           0           0           0     336,435     360,602  
Net Income                              238,801     689,623     752,912     819,649     882,084     598,106     641,071  
                                                                                                                         
Gross margin                                23%         41%         42%         43%         43%         43%         43%  
EBITDA margin                               16%         34%         35%         36%         37%         37%         38%  
Operating margin                            11%         29%         30%         31%         32%         33%         33%  
                                                                                                                         
Total customers                                                                                                          
Total lines                              14,027      14,697      15,390      16,107      16,885      17,652      18,548  
Total MOUs (millions)                     139.8       147.1       153.6       160.3       167.4       174.7       182.9  
Total employees                              70          70          70          70          70          74          74  
                                                                                                                         
Statement of Cash Flows:                                                                                                 
Net income                              238,801     686,623     752,912     819,649     882,084     598,106     641,071  
Depreciation & amortization             113,600     118,747     123,843     128,887     133,205     137,458     141,648  
Change in working capital                68,071      71,430      74,788      78,201      81,893      85,628      89,806  
Other non-cash items                          0           0           0           0           0           0           0  
Cash from Operations                    420,472     876,800     951,542   1,026,737   1,097,183     821,193     872,524  
                                                                                                                         
Capital expenditures                   (634,645)   (634,645)   (634,645)   (634,645)   (634,645)   (634,645)   (634,645) 
Other investments                             0           0           0           0           0           0           0  
Cash for investing                     (634,645)   (634,645)   (634,645)   (634,645)   (634,645)   (634,645)   (634,645)  
                                                                                                                         
Secured financing                                                                                                        
Debt repayment                         (210,788)   (210,788)   (210,788)   (210,788)   (210,788)   (210,788)   (210,788) 
Other debt financing                                                                                                     
Common A                                                                                                                 
Other equity                                                                                                             
Other                                                                                                                    
Cash from Financing                    (210,788)   (210,788)   (210,788)   (210,788)   (210,788)   (210,788)   (210,788)  
                                                                                                                         
Beg cash balance                      1,648,354   1,223,392   1,254,758   1,360,867   1,542,171   1,793,920   1,769,679  
Change in cash                         (424,962)     31,366     106,109     181,303     251,749     (24,241)     27,091  
Ending Cash Balance                   1,223,392   1,254,758   1,360,867   1,542,171   1,793,920   1,769,679   1,796,770  

<CAPTION> 

Focal Communications Corp.                      Initial Business Plan
Chicago Financial Plan
9/23/96                                                                                 Year 4
                                       Month 44    Month 45    Month 46    Month 47    Month 48 
<S>                                   <C>         <C>         <C>         <C>         <C>       
Income Statement:                     
Corp/VAR acct revenue                 1,544,164   1,622,928   1,697,557   1,772,477   1,850,283
ISP revenue                           1,584,422   1,638,793   1,695,977   1,754,085   1,815,128
Total Revenue                         3,128,587   3,261,720   3,383,534   3,526,563   3,665,412
 Carrier settlements                    763,777     798,667     831,107     865,080     902,693
 Sales & customer service expense       918,509     931,388     945,003     961,521     983,393
 General & administrative expenses       51,196      51,196      51,196      51,196      51,196 
Gross Profit                          1,395,104   1,480,470   1,566,228   1,648,766   1,728,129
 Corporate Overhead                     164,224     164,224     164,224     164,224     164,224 
(Total Cash Expenses)                 1,897,707   1,945,475   1,991,530   2,042,021   2,101,507
EBITDA                                1,230,880   1,316,245   1,402,004   1,484,542   1,563,905
 Depreciation & Amortization            145,774     149,839     153,843     157,786     161,671
Operating income                      1,085,105   1,166,406   1,248,161   1,326,755   1,402,235
 Other income (net)                           0           0           0           0           0
 Interest Expense                        (7,606)     (7,818)     (7,936)     (8,002)     (8,038) 
 Income Taxes                           393,376     422,721     452,195     480,513     507,698
Net Income                              699,335     751,503     803,902     854,245     902,574 
                                           
Gross margin                                45%         45%         46%         47%         47%
EBITDA margin                               39%         40%         41%         42%         43%
Operating margin                            35%         36%         37%         38%         38% 
                                      
Total customers                       
Total lines                              19,365      20,208      21,025      21,865      22,730
Total MOUs (millions)                     191.3       198.9       206.6       214.4       222.5
Total employees                              74          74          74          74          74
                                      
Statement of Cash Flows:              
Net income                              699,335     751,503     803,902     854,245     902,574 
Depreciation & amortization             145,774     149,839     153,843     157,786     161,671
Change in working capital                93,858      97,852     101,806     105,797     109,962
Other non-cash items                          0           0           0           0           0 
Cash from Operations                    938,967     999,194   1,059,551   1,117,828   1,174,207
                                      
Capital expenditures                   (634,645)   (634,645)   (634,645)   (634,645)   (634,645)  
Other investments                             0           0           0           0           0
Cash for investing                     (634,645)   (634,645)   (634,645)   (634,645)   (634,645)  
                                      
Secured financing                     
Debt repayment                         (210,788)   (210,788)   (210,788)   (210,788)   (210,788)  
Other debt financing                  
Common A                              
Other equity                          
Other                                 
Cash from Financing                    (210,788)   (210,788)   (210,788)   (210,788)   (210,788)  
                                      
Beg cash balance                      1,796,679   1,890,303   2,044,064   2,258,181   2,530,575
Change in cash                           93,534     153,760     214,117     272,394     328,774
Ending Cash Balance                   1,890,303   2,044,064   2,258,181   2,530,575   2,859,349
</TABLE> 

<PAGE>
 
<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                 Year 4                                                                    
                                                       Month 37             Month 38            Month 39            Month 40      
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:       
Cash from Operations                                     420,472             876,800             951,542           1,026,737   
Cash for investing                                      (634,645)           (634,645)           (634,645)           (634,645)  
Net Cash Flow                                           (214,174)            242,155             316,897             392,092   
Cash from Financing                                     (210,788)           (210,788)           (210,788)           (210,788)  
Cumulative Net Cash                                    1,223,392           1,254,758           1,360,867           1,542,171   
                                                                                                                               
Balance Sheet:                                                                                                                 
Cash & mid securities                                  1,223,392           1,254,758           1,360,867           1,542,171   
Accounts receivable                                    2,269,030           1,904,793           1,994,351           2,085,349   
Other current assets                                           0                   0                   0                   0   
Current Assets                                         3,492,422           3,159,551           3,355,218           3,627,519   
                                                                                                                               
Gross PPE                                             11,360,017          11,874,716          12,384,268          12,888,724   
Accum depreciation                                     2,224,970           2,343,717           2,467,560           2,596,447    
Net PPE                                                9,135,047           9,530,999           9,916,708          10,292,277    
                                                                                                                               
Goodwill & other intangibles                                   0                   0                   0                   0   
Other non-current assets                              (5,213,699)         (5,520,576)         (5,629,136)         (5,622,238)  
Non-current Assets                                     3,921,348           4,010,422           4,287,572           4,670,039   
Total Assets                                           7,413,771           7,169,973           7,642,790           8,297,558   
                                                                                                                               
Accounts Payable                                       2,291,217           1,887,338           1,940,622           1,994,256   
Debt maturities                                          248,439             131,473              16,666             (68,899)  
Other accrued expenses                                   190,935             157,278             161,719             166,188   
Current Liabilities                                    2,730,591           2,176,088           2,119,007           2,091,545   
                                                                                                                               
Secured debt                                             277,451             (64,810)           (292,264)           (434,152)  
Other long-term debt                                           0                   0                   0                   0   
Other non-current liab.                                  190,935             157,278             161,719             166,188  
Non-Current Liabilities                                  468,386              92,469            (130,545)           (267,964)  
                                                                                                                               
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000   
Other common stock                                             0                   0                   0                   0   
Additional paid-in capital                                     0                   0                   0                   0   
Retained earnings (deficit)                           (3,785,206)         (3,098,583)         (2,345,672)         (1,526,022)  
Shareowners Equity                                     4,214,794           4,901,417           5,654,328           6,473,978   
Total Liabilities & Shareowners Equity                 7,413,771           7,163,973           7,642,790           8,297,558   

Financial Ratios:
EBITDA/Cash Interest                                        49.4               284.6                  NA                  NA
EBITDA-Capex/Cash Interest                                 (37.8)               61.1                  NA                  NA
EBITDA/Interest                                             49.4               284.6              (874.8)             (253.2)
EBITDA-Capex/Interest                                      (37.8)               61.1              (240.8)              (83.1)
Debt/EBITDA                                                  0.1                 0.0                (0.0)               (0.0)
</TABLE> 

<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                 
                                                       Month 41             Month 42            Month 43            Month 44     
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:
Cash from Operations                                   1,097,183             821,193             872,524             938,967    
Cash for investing                                      (634,645)           (634,645)           (634,645)           (634,645)   
Net Cash Flow                                            462,538             186,547             237,879             304,322    
Cash from Financing                                     (210,788)           (210,788)           (210,788)           (210,788)   
Cumulative Net Cash                                    1,793,920           1,769,679           1,796,770           1,890,303    
                                                                                                                                
Balance Sheet:                                                                                                                  
Cash & mid securities                                  1,793,920           1,769,679           1,796,770           1,890,303    
Accounts receivable                                    1,910,846           1,997,982           2,095,471           2,190,011    
Other current assets                                           0                   0                   0                   0    
Current Assets                                         3,704,766           3,767,661           3,892,241           4,080,314    
                                                                                                                                
Gross PPE                                             13,320,519          13,745,837          14,164,775          14,577,429    
Accum depreciation                                     2,729,652           2,887,111           3,008,759           3,154,533    
Net PPE                                               10,590,866          10,878,726          11,156,016          11,422,896    
                                                                                                                                
Goodwill & other intangibles                                   0                   0                   0                   0    
Other non-current assets                              (5,176,523)         (4,917,796)         (4,632,117)         (4,359,662)   
Non-current Assets                                     5,414,343           5,960,930           6,523,899           7,063,234    
Total Assets                                           9,119,109           9,728,591          10,416,140          11,143,548    
                                                                                                                                
Accounts Payable                                       2,063,989           2,146,619           2,228,932           2,277,249    
Debt maturities                                         (125,763)           (161,235)           (182,492)           (194,880)   
Other accrued expenses                                   171,999             178,885             185,744             189,771    
Current Liabilities                                    2,110,226           2,164,269           2,232,184           2,272,140    
                                                                                                                                
Secured debt                                            (519,178)           (568,731)           (597,028)           (612,936)   
Other long-term debt                                           0                   0                   0                   0    
Other non-current liab.                                  171,999             178,885             185,744             189,771    
Non-Current Liabilities                                 (347,179)           (389,846)           (411,283)           (423,165)   
                                                                                                                                
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000    
Other common stock                                             0                   0                   0                   0    
Additional paid-in capital                                     0                   0                   0                   0    
Retained earnings (deficit)                             (643,938)            (45,832)            595,239           1,294,574    
Shareowners Equity                                     7,356,062           7,954,186           8,595,239           9,294,574    
Total Liabilities & Shareowners Equity                 9,119,109           9,728,591          10,416,140          11,143,548    

Financial Ratios:
EBITDA/Cash Interest                                          NA                  NA                  NA                  NA
EBITDA-Capex/Cash Interest                                    NA                  NA                  NA                  NA
EBITDA/Interest                                           (183.6)             (161.7)             (157.1)             (161.8)
EBITDA-Capex/Interest                                      (68.2)              (65.4)              (69.3)              (78.4)
Debt/EBITDA                                                 (0.1)               (0.1)               (0.1)               (0.1)
</TABLE> 

<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                                                                              Year 4
                                                       Month 45             Month 46            Month 47            Month 48     
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:
Cash from Operations                                     999,194           1,059,551           1,117,828           1,174,207   
Cash for investing                                      (634,645)           (634,645)           (634,645)           (634,645)  
Net Cash Flow                                            364,549             424,906             483,183             539,562   
Cash from Financing                                     (210,788)           (210,788)           (210,788)           (210,788)  
Cumulative Net Cash                                    2,044,064           2,258,181           2,530,575           2,859,349   
                                                                                                                               
Balance Sheet:                                                                                                                 
Cash & mid securities                                  2,044,064           2,258,181           2,530,575           2,859,349   
Accounts receivable                                    2,283,204           2,375,474           2,468,594           2,565,788
Other current assets                                           0                   0                   0                   0   
Current Assets                                         4,327,268           4,633,655           4,999,169           5,425,137   
                                                                                                                               
Gross PPE                                             14,983,893          15,384,260          15,778,622          16,167,068   
Accum depreciation                                     3,304,372           3,458,214           3,616,001           3,777,671
Net PPE                                               11,679,521          11,926,046          12,162,621          12,389,397   
                                                                                                                               
Goodwill & other intangibles                                   0                   0                   0                   0   
Other non-current assets                              (4,060,771)         (3,754,137)         (3,436,152)         (3,105,690)  
Non-current Assets                                     7,618,750           8,171,909           8,726,469           9,283,707   
Total Assets                                          11,946,018          12,805,564          13,726,838          14,708,844   
                                                                                                                               
Accounts Payable                                       2,334,570           2,389,837           2,450,425           2,521,808    
Debt maturities                                         (201,954)           (205,931)           (208,140)           (209,354)  
Other accrued expenses                                   194,548             199,153             204,202             210,151   
Current Liabilities                                    2,327,164           2,383,058           2,446,488           2,522,605   
                                                                                                                               
Secured debt                                            (621,770)           (626,628)           (629,276)           (630,711)  
Other long-term debt                                           0                   0                   0                   0   
Other non-current liab.                                  194,548             199,153             204,202             210,151  
Non-Current Liabilities                                 (427,223)           (427,475)           (425,074)           (420,560)  
                                                                                                                               
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000   
Other common stock                                             0                   0                   0                   0   
Additional paid-in capital                                     0                   0                   0                   0   
Retained earnings (deficit)                            2,046,078           2,849,980           3,704,225           4,606,799   
Shareowners Equity                                    10,046,078          10,849,980          11,704,225          12,606,799   
Total Liabilities & Shareowners Equity                11,946,018          12,805,564          13,725,638          14,708,844    

Financial Ratios:
EBITDA/Cash Interest                                          NA                  NA                  NA                  NA
EBITDA-Capex/Cash Interest                                    NA                  NA                  NA                  NA
EBITDA/Interest                                           (168.4)             (176.7)             (185.5)             (194.6)
EBITDA-Capex/Interest                                      (87.2)              (96.7)             (106.2)             (115.6)
Debt/EBITDA                                                 (0.1)               (0.0)               (0.0)               (0.0)
</TABLE> 
<PAGE>

Focal Communications Corp.                      Initial Business Plan
Chicago Financial Plan
9/23/96

<TABLE>
<CAPTION>
                                              Year 5
                                             Month 49      Month 50      Month 51      Month 52      Month 53      Month 54
<S>                                          <C>          <C>            <C>           <C>           <C>           <C>
Income Statement:
Corp/VAR acct revenue                        2,062,858     2,140,241     2,218,239     2,297,708     2,378,677     2,462,299
ISP revenue                                  1,827,145     1,895,007     1,960,737     2,028,783     2,098,091     2,170,683
Total Revenue                                3,890,003     4,035,247     4,178,976     4,326,491     4,476,767     4,632,983
 Carrier settlements                           971,754     1,000,600     1,037,545     1,075,406     1,112,755     1,153,710
 Sales & customer service expense            1,117,839     1,053,647     1,067,607     1,087,196     1,106,095     1,180,484
 General & administrative expenses              54,811        54,811        54,811        54,811        54,811        59,369
Gross Profit                                 1,745,599     1,926,189     2,019,013     2,109,077     2,203,106     2,239,420
 Corporate Overhead                            186,771       186,771       185,771       186,771       186,771       186,771
(Total Cash Expenses)                        2,331,175     2,295,830     2,346,734     2,404,185     2,460,432     2,580,334
EBITDA                                       1,558,828     1,739,418     1,832,242     1,922,308     2,016,335     2,052,649
 Depreciation & Amortization                   165,682       169,612       173,464       177,239       180,939       184,564
Operating income                             1,393,147     1,569,805     1,658,776     1,745,067     1,835,397     1,868,084
 Other income (net)                                  0             0             0             0             0             0
 Interest Expense                               (8,057)       (8,047)       (7,998)       (7,930)       (7,851)       (7,646)
 Income Taxes                                  504,434       568,027       600,039       631,079       663,569       675,263
Net Income                                     896,771     1,009,825     1,066,737     1,121,918     1,179,678     1,200,467

Gross margin                                        45%           48%           48%           49%           49%           48%
EBITDA margin                                       40%           43%           44%           44%           45%           44%
Operating margin                                    36%           39%           40%           40%           41%           40%

Total customers
Total lines                                     23,703        24,559        25,438        26,341        27,268        28,220
Total MOUs (millions)                            244.2         254.0         263.0         272.3         281.9         291.8
Total employees                                     82            82            82            82            82            89

Statement of Cash Flows:
Net income                                     896,771     1,009,825     1,066,737     1,121,918     1,179,678     1,200,467
Depreciation & amortization                    165,682       169,612       173,464       177,239       180,939       184,564
Change in working capital                      116,700       121,057       125,369       129,795       134,303       138,989
Other non-cash items                                 0             0             0             0             0             0
Cash from Operations                         1,179,152     1,300,495     1,365,570     1,428,952     1,494,920     1,524,021

Capital expenditures                          (739,210)     (739,210)     (739,210)     (739,210)     (739,210)     (739,210)
Other investments                                    0             0             0             0             0             0
Cash for investing                            (739,210)     (739,210)     (739,210)     (739,210)     (739,210)     (739,210)

Secured financing
Debt repayment                                (210,788)     (206,329)     (203,953)     (201,578)     (199,202)     (171,738)
Other debt financing
Common A
Other equity
Other
Cash from Financing                           (210,788)     (208,329)     (203,953)     (201,578)     (199,202)     (171,738)

Beg cash balance                             2,859,349     3,088,503     3,443,459     3,865,656     4,354,031     4,910,539
Change in cash                                 229,154       354,956       442,407       488,165       556,508       613,073
Ending Cash Balance                          3,088,503     3,443,459     3,865,866     4,354,031     4,910,539     5,523,611

<CAPTION>
                                                                                                                    Year 5
                                             Month 55      Month 56      Month 57      Month 58      Month 59      Month 60
<S>                                          <C>          <C>            <C>           <C>           <C>           <C>
Income Statement: 
Corp/VAR acct revenue                        2,535,601     2,609,906     2,684,248     2,759,642     2,837,229     2,915,075
ISP revenue                                  2,263,071     2,346,741     2,427,925     2,502,034     2,576,603     2,652,313
Total Revenue                                4,799,672     4,956,647     5,112,174     5,261,678     5,413,832     5,567,389
 Carrier settlements                         1,195,463     1,225,631     1,263,634     1,297,091     1,337,470     1,376,091
 Sales & customer service expense            1,208,503     1,216,803     1,233,445     1,245,573     1,266,762     1,280,137
 General & administrative expenses              59,369        59,369        59,369        59,369        59,369        59,369
Gross Profit                                 2,336,337     2,454,844     2,555,526     2,659,843     2,750,231     2,843,791
 Corporate Overhead                            186,771       186,771       186,771       186,771       186,771       186,771
(Total Cash Expenses)                        2,650,106     2,688,574     2,143,419     2,788,804     2,650,372     2,910,350
EBITDA                                       2,149,566     2,268,073     2,348,766     2,472,872     2,563,460     2,657,020
 Depreciation & Amortization                   188,117       191,599       195,011       198,355       201,632       204,844
Operating income                             1,961,449     2,076,474     2,173,744     2,274,517     2,361,827     2,452,176
 Other income (net)                                  0             0             0             0             0             0
 Interest Expense                               (7,317)       (7,018)       (6,777)       (6,589)       (6,438)       (6,311)
 Income Taxes                                  708,756       750,057       764,988       821,198       852,574       885,056
Net Income                                   1,260,011     1,333,435     1,395,533     1,459,908     1,515,690     1,573,432

Gross margin                                        49%           50%           50%           51%           51%           51%
EBITDA margin                                       45%           46%           46%           47%           47%           48%
Operating margin                                    41%           42%           43%           43%           44%           44%

Total customers
Total lines                                     29,267        30,197        31,151        32,056        32,980        33,926
Total MOUs (millions)                            302.8         313.9         313.9         334.3         344.1         354.2
Total employees                                     89            89            89            89            89            89

Statement of Cash Flows:
Net income                                   1,260,011     1,333,435     1,395,533     1,459,906     1,515,690     1,573,432
Depreciation & amortization                    188,117       191,599       195,011       198,355       201,632       204,844
Change in working capital                      143,990       148,699       153,365       157,850       157,415       167,022
Other non-cash items                                 0             0             0             0             0             0
Cash from Operations                         1,592,118     1,673,733     1,743,910     1,816,113     1,879,737     1,945,298

Capital expenditures                          (739,210)     (739,210)     (739,210)     (739,210)     (739,210)     (739,210)
Other investments                                    0             0             0             0             0             0
Cash for investing                            (739,210)     (739,210)     (739,210)     (739,210)     (739,210)     (739,210)

Secured financing                             (169,363)     (166,987)     (164,611)     (162,235)     (159,860)     (157,484)
Debt repayment
Other debt financing
Common A
Other equity
Other
Cash from Financing                           (169,363)     (166,987)     (164,611)     (162,235)     (159,860)     (157,484)

Beg cash balance                             5,523,611     6,207,157     6,974,693     7,814,782     8,729,450     9,710,118
Change in cash                                 683,545       767,537       840,089       914,668       980,668     1,048,604
Ending Cash Balance                          6,207,157     6,974,693     7,814,782     8,729,450     9,710,118    10,758,722
</TABLE>

<PAGE>
 
<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                 Year 5                                                                    
                                                       Month 49             Month 50            Month 51            Month 52      
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:       
Cash from Operations                                   1,179,152           1,300,495           1,365,570           1,428,952   
Cash for investing                                      (739,210)           (739,210)           (739,210)           (739,210)  
Net Cash Flow                                            439,943             561,285             626,360             689,742   
Cash from Financing                                     (210,788)           (206,329)           (203,953)           (201,578)  
Cumulative Net Cash                                    3,088,503           3,443,459           3,865,866           4,354,031   
                                                                                                                               
Balance Sheet:                                                                                                                 
Cash & mid securities                                  3,088,503           3,443,459           3,865,866           4,354,031   
Accounts receivable                                    2,723,002           2,824,673           2,925,283           3,028,544   
Other current assets                                           0                   0                   0                   0   
Current Assets                                         5,811,505           6,268,132           6,791,149           7,382,574   
                                                                                                                               
Gross PPE                                             16,568,152          16,961,215          17,346,416          17,723,914   
Accum depreciation                                     3,943,353           4,112,965           4,286,429           4,463,568    
Net PPE                                               12,624,800          12,848,250          13,059,987          13,260,245    
                                                                                                                               
Goodwill & other intangibles                                   0                   0                   0                   0   
Other non-current assets                              (2,510,590)         (2,226,638)         (1,816,967)         (1,398,426)  
Non-current Assets                                    10,114,210          10,621,612          11,243,020          11,661,819   
Total Assets                                          15,925,715          16,889,745          18,034,169          19,244,383   
                                                                                                                               
Accounts Payable                                       2,797,410           2,754,995           2,816,081           2,885,022   
Debt maturities                                         (210,016)           (210,375)           (209,453)           (207,848)  
Other accrued expenses                                   233,117             229,583             234,673             240,418   
Current Liabilities                                    2,820,511           2,774,204           2,841,301           2,917,592   
                                                                                                                               
Secured debt                                            (631,483)           (627,437)           (621,938)           (615,668)  
Other long-term debt                                           0                   0                   0                   0   
Other non-current liab.                                  233,117             229,583             234,673             240,418  
Non-Current Liabilities                                 (398,365)           (397,854)           (387,264)           (375,249)  
                                                                                                                               
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000   
Other common stock                                             0                   0                   0                   0   
Additional paid-in capital                                     0                   0                   0                   0   
Retained earnings (deficit)                            5,503,570           6,513,395           7,580,132           8,702,050   
Shareowners Equity                                    13,503,570          14,513,395          15,580,132          16,702,050   
Total Liabilities & Shareowners Equity                16,926,716          16,889,745          18,034,169          19,244,393   

Financial Ratios:
EBITDA/Cash Interest                                          NA                  NA                  NA                  NA
EBITDA-Capex/Cash Interest                                    NA                  NA                  NA                  NA
EBITDA/Interest                                           (193.5)             (216.2)             (229.1)             (242.4)
EBITDA-Capex/Interest                                     (101.7)             (124.3)             (136.7)             (149.2)
Debt/EBITDA                                                 (0.0)               (0.0)               (0.0)               (0.0)
</TABLE> 

<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                 
                                                       Month 53             Month 54            Month 55            Month 56     
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:
Cash from Operations                                   1,494,920           1,524,021           1,592,118           1,673,733    
Cash for investing                                      (739,210)           (739,210)           (739,210)           (739,210)   
Net Cash Flow                                            755,710             784,811             852,908             934,523    
Cash from Financing                                     (199,202)           (171,738)           (169,363)           (166,987)   
Cumulative Net Cash                                    4,910,539           5,523,611           6,207,157           6,974,693    
                                                                                                                                
Balance Sheet:                                                                                                                  
Cash & mid securities                                  4,910,539           5,523,611           6,207,157           6,974,693    
Accounts receivable                                    3,133,737           3,243,088           3,359,771           3,469,653    
Other current assets                                           0                   0                   0                   0    
Current Assets                                         8,044,278           8,766,699           9,566,927          10,444,346    
                                                                                                                                
Gross PPE                                             18,093,861          18,456,409          18,811,707          19,159,898    
Accum depreciation                                     4,644,607           4,829,171           5,017,288           5,208,887    
Net PPE                                               13,449,254          13,627,238          13,794,419          13,951,011    
                                                                                                                                
Goodwill & other intangibles                                   0                   0                   0                   0    
Other non-current assets                                (982,066)           (480,004)            (55,366)            326,108    
Non-current Assets                                    12,467,188          13,147,235          13,739,053          14,277,119    
Total Assets                                          20,511,463          21,913,934          23,305,980          24,721,465    
                                                                                                                                
Accounts Payable                                       2,952,518           3,096,401           3,180,127           3,226,289    
Debt maturities                                         (205,879)           (203,717)           (195,182)           (186,594)   
Other accrued expenses                                   246,043             258,033             265,011             268,857    
Current Liabilities                                    2.992,683           3,150,717           3,249,956           3,308,552    
                                                                                                                                
Secured debt                                            (608,991)           (577,012)           (551,192)           (531,585)   
Other long-term debt                                           0                   0                   0                   0    
Other non-current liab.                                  246,043             258,033             265,011             268,857    
Non-Current Liabilities                                 (362,948)           (318,978)           (286,182)           (262,728)   
                                                                                                                                
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000    
Other common stock                                             0                   0                   0                   0    
Additional paid-in capital                                     0                   0                   0                   0    
Retained earnings (deficit)                            9,881,728)         11,082,195          12,342,206          13,675,641    
Shareowners Equity                                    17,881,728          19,082,195          20,342,206          21,675,641    
Total Liabilities & Shareowners Equity                20,511,463          21,913,934          23,305,880          24,721,465    

Financial Ratios:
EBITDA/Cash Interest                                          NA                  NA                  NA                  NA
EBITDA-Capex/Cash Interest                                    NA                  NA                  NA                  NA
EBITDA/Interest                                           (256.8)             (268.5)             (293.8)             (323.2)
EBITDA-Capex/Interest                                     (162.7)             (171.8)             (192.7)             (217.9)
Debt/EBITDA                                                 (0.0)               (0.0)               (0.0)               (0.0)
</TABLE> 

<TABLE> 
<CAPTION> 
Focal Communications Corp.                            Initial Business Plan
Chicago financial Plan
9/23/96                                                                                                              Year 5
                                                       Month 57             Month 58            Month 59            Month 60     
<S>                                                    <C>                 <C>                <C>                <C>              
Cash Summary:
Cash from Operations                                   1,743,910           1,816,113           1,879,737           1,945,298   
Cash for investing                                      (739,210)           (739,210)           (739,210)           (739,210)  
Net Cash Flow                                          1,004,700           1,076,903           1,140,528           1,206,088   
Cash from Financing                                     (164,611)           (162,235)           (159,860)           (157,484)  
Cumulative Net Cash                                    7,814,782           8,729,450           9,710,118          10,758,722   
                                                                                                                               
Balance Sheet:                                                                                                                 
Cash & mid securities                                  7,814,782           8,729,450           9,710,118          10,758,722   
Accounts receivable                                    3,578,522           3,683,173           3,789,683           3,897,172
Other current assets                                           0                   0                   0                   0   
Current Assets                                        11,393,304          12,412,623          13,499,801          14,655,894   

                                                                                                                               
Gross PPE                                             19,501,126          19,835,529          20,163,244          20,484,404   
Accum depreciation                                     5,403,898           5,602,253           5,803,886           6,008,730
Net PPE                                               14,097,227          14,233,275          14,359,358          14,475,674   
                                                                                                                               
Goodwill & other intangibles                                   0                   0                   0                   0   
Other non-current assets                                 725,233           1,110,621           1,513,437           1,910,691   
Non-current Assets                                    14,822,460          15,343,897          15,872,795          16,386,365   
Total Assets                                          26,215,764          27,756,520          29,372,595          31,042,260   
                                                                                                                               
Accounts Payable                                       3,292,103           3,346,565           3,420,447           3,492,442   
Debt maturities                                         (179,545)           (174,049)           (169,722)           (166,174)  
Other accrued expenses                                   274,342             278,880             285,037             291,037   
Current Liabilities                                    3,386,900           3,451,396           3,535,762           3.617,305   
                                                                                                                               
Secured debt                                            (516,652)           (504,838)           (494,976)           (486,285)  
Other long-term debt                                           0                   0                   0                   0   
Other non-current liab.                                  274,342             278,880             285,037             291,037  
Non-Current Liabilities                                 (242,310)           (225,958)           (209,939)           (195,248)  
                                                                                                                               
Common stock A                                         8,000,000           8,000,000           8,000,000           8,000,000   
Other common stock                                             0                   0                   0                   0   
Additional paid-in capital                                     0                   0                   0                   0   
Retained earnings (deficit)                           15,071,174          16,531,082          18,046,771          19,620,204   
Shareowners Equity                                    23,071,174          24,531,082          26,046,771          27,620,204   
Total Liabilities & Shareowners Equity                26,215,764          27,756,520          29,372,595          31,042,260    

Financial Ratios:
EBITDA/Cash Interest                                          NA                  NA                  NA                  NA
EBITDA-Capex/Cash Interest                                    NA                  NA                  NA                  NA
EBITDA/Interest                                           (349.5)             (375.3)             (398.2)             (421.0)
EBITDA-Capex/Interest                                     (240.4)             (263.1)             (283.4)             (303.9)
Debt/EBITDA                                                 (0.0)               (0.0)               (0.0)               (0.0)
</TABLE> 

<PAGE>
 
                     EXHIBIT 2 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------


Restated Certificate of Incorporation, dated November 26, 1996 - Previously
filed as Exhibit 3.1 to the Form S-4 Registration Statement on April 3, 1998.

<PAGE>
 
                     EXHIBIT 3 TO STOCK PURCHASE AGREEMENT

                            Form of Promissory Note
<PAGE>
 
                                PROMISSORY NOTE
                                ---------------

$5,627.91                                                      November 27, 1996


       For value received, Brian F. Addy (the "Executive Investor") hereby
                                               ------------------         
promises to pay to the order of Focal Communications Corporation, a Delaware
corporation (the "Company"), the principal amount of $5,627.91, together with
                  -------                                                       
interest thereon calculated from the date hereof in accordance with the
provisions of this promissory note (this "Note").  This Note is issued pursuant
                                          ----                                 
to the stock purchase agreement of even date herewith, by and between the
Company, the Executive Investor, and certain other investors listed on the
signature pages attached thereto (as amended from time to time pursuant to its
terms, the "Stock Purchase Agreement").  The amounts due under this Note are
            ------------------------                                        
secured by a pledge of all Company common stock held by the Executive Investor
during the period of this Note, pursuant to the terms of a pledge agreement of
even date herewith, by and between the Company and the Executive Investor (the
"Executive Investor Stock Pledge Agreement").
 -----------------------------------------   

       Interest shall accrue on a daily basis on the outstanding principal
amount of this Note at a rate per annum equal to the applicable federal rate
for obligations of similar duration, published monthly by the Internal Revenue
Service, and such interest shall be due and payable at such time as the
principal amount of this Note becomes due and payable, or, if earlier, at such
time as the principal amount of this Note is paid in full.

       The Executive Investor shall repay the entire unpaid principal amount of
this Note and any accrued and unpaid interest thereon on the 90th day after the
date first written above (the "Maturity Date"). The Executive Investor may, at
                                -------------                                  
any time and from time to time, without premium or penalty, prepay all or any
portion of the outstanding principal amount of this Note; provided that any
                                                          --------         
prepayment shall first be applied to any accrued but unpaid interest.

       In the event the Executive Investor fails to pay any amounts due
hereunder when due, the Executive Investor shall pay to the holder hereof, in
addition to such amounts due, all costs of collection, including reasonable
attorneys fees.

       The Executive Investor, or his successors and assigns, hereby waives
diligence, presentment, protest and demand and notice of protest, demand,
dishonor and nonpayment of this Note, and expressly agrees that this Note, or
any payment hereunder, may be extended from time to time and that the holder
hereof may accept security for this Note or release security for this Note, all
without in any way affecting the liability of the Executive Investor hereunder.

       This Note shall be governed by the internal laws, and not the laws of
conflicts, of the State of Illinois.



                                             /s/ Brian F. Addy
                                        ----------------------------------------
                                                 Brian F. Addy
<PAGE>
 
                                PROMISSORY NOTE
                                ---------------


$5,627.91                                                      November 27, 1996


       For value received, John R. Barnicle (the "Executive Investor") hereby
                                                  ------------------         
promises to pay to the order of Focal Communications Corporation, a Delaware
corporation (the "Company"), the principal amount of  $5,627.91, together
                  -------                                                   
with interest thereon calculated from the date hereof in accordance with the
provisions of this promissory note (this "Note").  This Note is issued pursuant
                                          ----                                 
to the stock purchase agreement of even date herewith, by and between the
Company, the Executive Investor, and certain other investors listed on the
signature pages attached thereto (as amended from time to time pursuant to its
terms, the "Stock Purchase Agreement").  The amounts due under this Note are
            ------------------------                                        
secured by a pledge of all Company common stock held by the Executive Investor
during the period of this Note, pursuant to the terms of a pledge agreement of
even date herewith, by and between the Company and the Executive Investor (the
"Executive Investor Stock Pledge Agreement").
- ------------------------------------------   

       Interest shall accrue on a daily basis on the outstanding principal
amount of this Note at a rate per annum equal to the applicable federal rate for
obligations of similar duration, published monthly by the Internal Revenue
Service, and such interest shall be due and payable at such time as the
principal amount of this Note becomes due and payable, or, if earlier, at such
time as the principal amount of this Note is paid in full.

       The Executive Investor shall repay the entire unpaid principal amount of
this Note and any accrued and unpaid interest thereon on the 90th day after the
date first written above (the "Maturity Date").  The Executive Investor may, at
                               -------------                                   
any time and from time to time, without premium or penalty, prepay all or any
portion of the outstanding principal amount of this Note; provided that any
                                                          --------         
prepayment shall first be applied to any accrued but unpaid interest.

       In the event the Executive Investor fails to pay any amounts due
hereunder when due, the Executive Investor shall pay to the holder hereof, in
addition to such amounts due, all costs of collection, including reasonable
attorneys fees.

       The Executive Investor, or his successors and assigns, hereby waives
diligence, presentment, protest and demand and notice of protest, demand,
dishonor and nonpayment of this Note, and expressly agrees that this Note, or
any payment hereunder, may be extended from time to time and that the holder
hereof may accept security for this Note or release security for this Note, all
without in any way affecting the liability of the Executive Investor hereunder.

       This Note shall be governed by the internal laws, and not the laws of
conflicts, of the State of Illinois.


                                             /s/ John R. Barnicle
                                        ----------------------------------------
                                                 John R. Barnicle
<PAGE>
 
                                PROMISSORY NOTE
                                ---------------

$5,627.91                                                      November 27, 1996


       For value received, Joseph A. Beatty (the "Executive Investor") hereby
                                                  ------------------         
promises to pay to the order of Focal Communications Corporation, a Delaware
corporation (the "Company"), the principal amount of $5,627.91, together with
                  -------                                                       
interest thereon calculated from the date hereof in accordance with the
provisions of this promissory note (this "Note").  This Note is issued pursuant
                                          ----                                 
to the stock purchase agreement of even date herewith, by and between the
Company, the Executive Investor, and certain other investors listed on the
signature pages attached thereto (as amended from time to time pursuant to its
terms, the "Stock Purchase Agreement").  The amounts due under this Note are
            ------------------------                                        
secured by a pledge of all Company common stock held by the Executive Investor
during the period of this Note, pursuant to the terms of a pledge agreement of
even date herewith, by and between the Company and the Executive Investor (the
"Executive Investor Stock Pledge Agreement").
- ------------------------------------------   

       Interest shall accrue on a day basis on the outstanding principal amount
of this Note at a rate per annum equal to the applicable federal rate for
obligations of similar duration, published monthly by the Internal Revenue
Service, and such interest shall be due and payable at such time as the
principal amount of this Note becomes due and payable, or, if earlier, at such
time as the principal amount of this Note is paid in full.

       The Executive Investor shall repay the entire unpaid principal amount of
this Note and any accrued and unpaid interest thereon on the 90th day after the
date first written above (the "Maturity Date").  The Executive Investor may, at
                               -------------                                   
any time and from time to time, without premium or penalty, prepay all or any
portion of the outstanding principal amount of this Note; provided that any
                                                          --------         
prepayment shall first be applied to any accrued but unpaid interest.

       In the event the Executive Investor fails to pay any amounts due
hereunder when due, the Executive Investor shall pay to the holder hereof, in
addition to such amounts due, all costs of collection, including reasonable
attorneys fees.

       The Executive Investor, or his successors and assigns, hereby waives
diligence, presentment, protest and demand and notice of protest, demand,
dishonor and nonpayment of this Note, and expressly agrees that this Note, or
any payment hereunder, may be extended from time to time and that the holder
hereof may accept security for this Note or release security for this Note, all
without in any way affecting the liability of the Executive Investor hereunder.

       This Note shall be governed by the internal laws, and not the laws of
conflicts, of the State of Illinois.

                                             /s/ Joseph A. Beatty
                                        ----------------------------------------
                                                 Joseph A. Beatty
<PAGE>
 
                                PROMISSORY NOTE
                                ---------------

$5,627.91                                                      November 27, 1996


       For value received, Robert C. Taylor, Jr. (the "Executive Investor")
                                                       ------------------  
hereby promises to pay to the order of Focal Communications Corporation, a
Delaware corporation (the "Company"), the principal amount of $5,627.91,    
together with interest thereon calculated from the date hereof in accordance
with the provisions of this promissory note (this "Note"). This Note is issued
                                                   ----                       
pursuant to the stock purchase agreement of even date herewith, by and between
the Company, the Executive Investor, and certain other investors listed on the
signature pages attached thereto (as amended from time to time pursuant to its
terms, the "Stock Purchase Agreement"). The amounts due under this Note are
            ------------------------                                       
secured by a pledge of all Company common stock held by the Executive Investor
during the period of this Note, pursuant to the terms of a pledge agreement of
even date herewith, by and between the Company and the Executive Investor (the
"Executive Investor Stock Pledge Agreement").
- ------------------------------------------   

       Interest shall accrue on a daily basis on the outstanding principal
amount of this Note at a rate per annum equal to the applicable federal rate for
obligations of similar duration, published monthly by the Internal Revenue
Service, and such interest shall be due and payable at such time as the
principal amount of this Note becomes due and payable, or, if earlier, at such
time as the principal amount of this Note is paid in full.  

       The Executive Investor shall repay the entire unpaid principal amount of
this Note and any accrued and unpaid interest thereon on the 90th day after the
date first written above (the "Maturity Date"). The Executive Investor may, at
                               -------------
any time and from time to time, without premium or penalty, prepay all or any
portion of the outstanding principal amount of this Note; provided that any
                                                          --------
prepayment shall first be applied to any accrued but unpaid interest.

       In the event the Executive Investor fails to pay any amounts due
hereunder when due, the Executive Investor shall pay to the holder hereof, in
addition to such amounts due, all costs of collection, including reasonable
attorneys fees.

       The Executive Investor, or his successors and assigns, hereby waives
diligence, presentment, protest and demand and notice of protest, demand,
dishonor and nonpayment of this Note, and expressly agrees that this Note, or
any payment hereunder, may be extended from time to time and that the holder
hereof may accept security for this Note or release security for this Note, all
without in any way affecting the liability of the Executive Investor hereunder.

       This Note shall be governed by the internal laws, and not the laws of
conflicts, of the State of Illinois.


                                             /s/ Robert C. Taylor, Jr.
                                        ----------------------------------------
                                                 Robert C. Taylor, Jr.
<PAGE>
 
                     EXHIBIT 4 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------



Form of Executive Investor Stock Pledge Agreement - Exhibits 4.7-4.10 to the
Form S-4 Registration Statement filed on April 3, 1998 are Executive Investor
Stock Pledge Agreements executed by Addy, Barnicle, Beatty, and Taylor, Jr.,
respectively.
<PAGE>
 
                     EXHIBIT 5 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------



Bylaws Amendment - Previously filed as Exhibit 3.2 to the Form S-4 Registration
Statement on April 3, 1998.
<PAGE>
 
                     EXHIBIT 6 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------



Stockholders Agreement by and among Focal, MDCP, Frontenac, BV, Addy, Barnicle,
Beatty and Taylor - Previously filed as Exhibit 4.11 to the Form S-4
Registration Statement on April 3, 1998.
<PAGE>
 
                     EXHIBIT 7 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------



Form of Executive Stock Agreement and Employment Agreement - Exhibits 4.12-4.15
to the Form S-4 Registration Statement filed on April 3, 1998 are Executive
Stock Agreement and Employment Agreements executed by Addy, Barnicle, Beatty and
Taylor, Jr., respectively.
<PAGE>
 
                     EXHIBIT 8 TO STOCK PURCHASE AGREEMENT
                     -------------------------------------



Registration Agreement by and among Focal, MDCP, Frontenac, BV, Addy, Barnicle,
Beatty and Taylor - Previously filed as Exhibit 4.16 to the Form S-4
Registration Statement on April 3, 1998.
<PAGE>
 
                     EXHIBIT 9 TO STOCK PURCHASE AGREEMENT

                           Form of Vesting Agreement
<PAGE>
 
                               VESTING AGREEMENT
                               -----------------

     THIS VESTING AGREEMENT (this "Agreement") is made as of November 27, 1996,
                                   ---------                                   
by and among Battery Ventures III, L.P. (the "New Capital Investor"), Focal
                                              --------------------         
Communications Corporation (the "Company"), and each of Robert C. Taylor, Jr.,
                                 -------                                      
John R. Barnicle, Brian F. Addy and Joseph Beatty (individually an "Executive
                                                                    ---------
Investor" and collectively the "Executive Investors").
- --------                        -------------------   

     The execution and delivery of this Agreement is a condition to the purchase
of the Company's Class A Common Stock, par value $.01 per share (the "Class A
                                                                      -------
Common"), by the New Capital Investor, the Executive Investors and certain other
- ------                                                                          
investors (collectively, the "Investors"), pursuant to a Stock Purchase
                              ---------                                
Agreement of even date herewith by and among the Company and such Investors (the
"Stock Purchase Agreement").  Capitalized terms used but not otherwise defined
 ------------------------                                                     
herein are used herein with the meanings ascribed to such terms in Sections 2
and 3 below.

     NOW, THEREFORE, in consideration of the mutual premises made herein and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties agree as follows:

     Section 1.     Vesting and Forfeiture.
                    ---------------------- 

     1A.  Vesting and Forfeiture upon a Sale.  Contemporaneously with any sale
          ----------------------------------                                  
or transfer by the New Capital Investor to any person of any shares of Qualified
Common (including by way of merger or consolidation, but excluding (i) any sale
or transfer of shares to a Successor Fund upon such Successor Fund's execution
of a counterpart to this Agreement agreeing to be bound by the provisions hereof
and to succeed to the rights and obligations of New Capital Investor hereunder
with respect to the shares of Qualified Common sold or transferred to such
Successor Fund, and (ii) any recapitalization or other reorganization in which
the New Capital Investor's holdings of the Company's equity immediately after
such transaction are equal to the New Capital Investor's holdings of the
Company's equity immediately prior to such transaction) (a "Sale"):
                                                            ----   

                    (a)   a number (if any) of the shares of Unvested Class C
     Common held by each holder of Unvested Class C Common shall vest equal to
     the product obtained by multiplying (x) the number of shares of Qualified
     Common being transferred in such Sale, times (y) such holder's Applicable
                                            -----                             
     Percentage for such Sale;

                    (b)   a number (if any) of the New Capital Investor's shares
     of Nonqualified Common equal to the product obtained by multiplying (i) the
     number of shares of Qualified Common being transferred in such Sale, times
     (ii) the sum of the Applicable Percentages for all holders of Unvested
     Class C Common for such Sale, shall without further action by the Company
     or the New Capital Investor automatically be deemed forfeited, and the New
     Capital Investor shall thereafter no longer exercise nor have the right to
     exercise any of its rights with respect to such forfeited shares; and

                    (c)   a number of the shares of Unvested Class C Common held
     by each holder of Unvested Class C Common equal to the difference (if any)
     obtained by subtracting

<PAGE>
 
     (i) the number of such holder's shares of Unvested Class C Common that are
     to vest as a result of such Sale, from (ii) the number of such holder's
     shares of Unvested Class C Common that would vest as a result of such Sale
     if the Return Multiple for such Sale were 35, shall without further action
     by the Company or such holder automatically be deemed forfeited and such
     holder shall thereafter no longer exercise nor have the right to exercise
     any of its rights with respect to such forfeited shares.

          1B.  Vesting and Forfeiture upon Election Notice following a Rule 144
               ----------------------------------------------------------------
Quarter. If, within 10 business days after any calendar quarter (following the
- -------                                                                       
consummation of  the Company's initial Public Offering) during which any shares
of Qualified Common then held by the New Capital Investor (excluding (i) shares
sold or transferred pursuant to a Sale during such calendar quarter, and (ii)
shares the transfer of which during such calendar quarter would have been
restricted under any hold-back agreement entered into with, or for the benefit
of, the Company or its underwriters) are eligible to be transferred pursuant to
Rule 144 promulgated by the Securities Exchange Commission under the Securities
Act of 1933, as amended, or any successor rule or rules then in effect ("Rule
                                                                         ----
144") as of the last business day of such calendar quarter (such a calendar
- ---                                                                        
quarter, a "Rule 144 Quarter") (such eligible shares, the "Rule 144 Eligible
            ----------------                               -----------------
Shares"), any holder of Unvested Class C Common gives written notice to the New
- ------                                                                         
Capital Investor setting forth the number of Rule 144 Eligible Shares for such
Rule 144 Quarter, such holder's estimated calculation of the Fair Market Value
of such Rule 144 Eligible Shares (including all market information necessary to
enable the New Capital Investor to perform such calculation), and such holder's
estimated calculation of the number of such holder's shares of Unvested Class C
Common that will vest pursuant to paragraph I B(a) with respect to such Rule 144
Quarter ("Election Notice"), then on the 20th business day following such Rule
          ---------------                                                     
144 Quarter:

               (a)   a number (if any) of the shares of Unvested Class C Common
     held by each such electing holder shall vest equal to the product obtained
     by multiplying (x) the number of Rule 144 Eligible Shares for such Rule 144
     Quarter, times (y) such holder's Applicable Percentage for such Rule 144
     Quarter;

               (b)   a number (if any) of the New Capital Investor's shares of
     Nonqualified Common equal to the product obtained by multiplying (x) the
     number of Rule 144 Eligible Shares for such Rule 144 Quarter, times (y) the
                                                                   -----        
     sum of the Applicable Percentages for such Rule 144 Quarter for all holders
     of Unvested Class C Common giving Election Notice with respect to such Rule
     144 Quarter, shall without further action by the Company or the New Capital
     Investor automatically be deemed forfeited, and the New Capital Investor
     shall thereafter no longer exercise nor have the right to exercise any of
     its rights with respect to such forfeited shares;

               (c)   a number of the shares of Unvested Class C Common held by
     each holder of Unvested Class C Common giving Election Notice with respect
     to such Rule 144 Quarter equal to the difference (if any) obtained by
     subtracting (i) the number of such holder's shares of Unvested Class C
     Common that are to vest as a result of giving such 

                                      -2-
<PAGE>
 
     Election Notice, from (ii) the number of such holder's shares of Unvested
     Class C Common that would vest as a result of giving such Election Notice
     if the Return Multiple for such Rule 144 Quarter were 35, shall without
     further action by the Company or such holder automatically be deemed
     forfeited, and such holder shall thereafter no longer exercise nor have the
     right to exercise any of its rights with respect to such forfeited shares.

          1C.  Vesting and Forfeiture upon Liquidation.  Contemporaneously with
               ---------------------------------------                         
a complete liquidation of the Company (the "Liquidation"):
                                            -----------   

               (a)   a number (if any) of the shares of Unvested Class C Common
     held by each holder of Unvested Class C Common shall vest equal to the
     product obtained by multiplying (x) the number of shares of Qualified
     Common held by New Capital Investor as of the date of the Liquidation,
     times (y) such holder's Applicable Percentage for such Liquidation;
     -----                                                              

               (b)   a number (if any) of the New Capital  Investor's shares of
     Nonqualified Common equal to the product obtained by multiplying (i) the
     number of shares of Qualified Common held by the New Capital Investor as of
     the date of the Liquidation, times (ii) the sum of the Applicable
                                  -----                               
     Percentages for all holders of Unvested Class C Common for such
     Liquidation, shall without further action by the Company or the New Capital
     Investor automatically be deemed forfeited, and the New Capital Investor
     shall thereafter no longer exercise nor have the right to exercise any of
     its rights with respect to such forfeited shares.

               (c)   a number of the shares of Unvested Class C Common held by
     each holder of Unvested Class C Common equal to the difference (if any)
     obtained by subtracting (i) the number of such holder's shares of Unvested
     Class C Common that are to vest as a result of such Liquidation, from (ii)
     the number of such holders shares of Unvested Class C Common that would
     vest as a result of such Liquidation if the Return Multiple for such
     Liquidation were 35, shall without further action by the Company or such
     holder automatically be deemed forfeited, and such holder shall thereafter
     no longer exercise nor have the right to exercise any of its rights with
     respect to such forfeited shares.

          1D.  Forfeiture upon Termination of this Agreement.  Upon the seventh
               ---------------------------------------------                   
anniversary of the date hereof, all Unvested Class C Common then outstanding
shall without further action by the Company or any holder of such Unvested Class
C Common automatically be deemed forfeited, and each such holder shall
thereafter no longer exercise nor have the right to exercise any of its rights
with respect to such forfeited shares.

          1E.  Forfeiture Procedure.  Upon any forfeiture of any shares of
               --------------------                                       
Unvested Class C Common or Nonqualified Common pursuant to this Agreement, the
holder of such forfeited shares shall promptly submit the certificate or
certificates representing such forfeited shares to the Company for cancellation.
Upon such submission, the Company shall take all actions necessary to retire
such forfeited shares and to cause such shares to resume the status of
authorized and unissued shares.  The 

                                      -3-
<PAGE>
 
Company shall promptly cancel the submitted certificate(s) and issue to such
holder (i) a certificate, bearing the legend set forth in paragraph 5B below,
representing the number of shares (if any) of Unvested Class C Common or
Nonqualified Common, as applicable, which were evidenced by the submitted
certificate(s) but which were not forfeited, and (ii) a certificate, not bearing
the legend set forth in paragraph 4B below, representing the number of shares
represented by the submitted certificate(s) that were not forfeited and that in
connection with such forfeiture ceased to be Nonqualified Common or became
Vested Class C Common. as applicable.

          Section 2.     Calculation of Each Holder's Applicable Percentage.

          2A.  Applicable Percentage.  For each Sale, Liquidation, or Rule 144
               ---------------------                                          
Quarter, the "Applicable Percentage" for each holder of Unvested Class C Common
              ---------------------                                            
shall be equal to the percentage obtained by multiplying:

               (a)   25% (or if such holder is no longer employed by the Company
     or any of its Subsidiaries ("Termination"), the product of (i) 25%, times
                                  -----------                                 
     (ii) a fraction, the numerator of which is the number of shares of Unvested
     Class C Common held by such holder immediately prior to Termination that
     were not elected to be repurchased pursuant to an Executive Stock Agreement
     as a result of such Termination, and the denominator of which is the number
     of shares of Unvested Class C Common held by such holder immediately prior
     to such Termination); times

               (b)   the quotient obtained by dividing (x) the Return Multiple
     for such Sale, Liquidation, or Rule 144 Quarter minus 20 (provided that
                                                     -----     --------
     such difference shall not be less than zero nor greater than 15), by (y)
     65.

          2B.  Calculation of the Return Multiple.
               ---------------------------------- 

          (a)  The "Return Multiple" for each Sale shall be equal to the
                    ---------------
     quotient obtained by dividing:

               (i)   the Fair Market Value of all consideration that the New
     Capital Investor will receive in such Sale in exchange for the shares of
     Qualified Common to be transferred or sold by the New Capital Investor in
     such Sale, by

               (ii)  the Total Cost and Contributions for the shares of
     Qualified Common to be transferred or sold by the New Capital Investor in
     such Sale (as well as any shares of Nonqualified Common that will be
     forfeited pursuant to this Agreement in connection with such Sale).

          (b)  The "Return Multiple" for each Liquidation shall be equal to the
                    ---------------                                            
quotient obtained by dividing:

                                      -4-
<PAGE>
 
               (i)    the Fair Market Value of all consideration to be
     distributed in such Liquidation to the New Capital Investor with respect to
     the shares of Qualified Common held by the New Capital Investor as of the
     date of such Liquidation, by

               (ii)   the Total Cost and Contributions for the shares of
     Qualified Common held by the New Capital Investor as of the date of such
     Liquidation (as well as any shares of Nonqualified Common that will be
     forfeited pursuant to this Agreement in connection with such Liquidation).

          (c)  The "Return Multiple" for each Rule 144 Quarter shall be equal to
                    ---------------                                             
the quotient obtained by dividing:

               (i)    the Fair Market Value of all of the New Capital Investor's
     Rule 144 Eligible Shares for such Rule 144 Quarter, by

               (ii)   the Total Cost and Contributions for the New Capital
     Investor's Rule 144 Eligible Shares for such Rule 144 Quarter (as well as
     any shares of Nonqualified Common to be forfeited pursuant to this
     Agreement by virtue of all Election Notices filed with respect to such Rule
     144 Quarter).

          Section 3.  Definitions.

          "Executive Stock Agreements" means the executive stock agreements of
            -------------------------                                         
even date herewith, each by and between the Company and one Executive Investor,
as amended from time to time pursuant to their terms.

          "Fair Market Value" shall mean:
           -----------------             

               (i)    with respect to any Rule 144 Eligible Share, the weighted
     average (based on the volume of trading in shares of the class of the
     Company's common stock that includes the Rule 144 Eligible Shares (the
     Company's "Common Stock") on each business day during the Rule 144 Quarter)
                ------------                                                    
     over all of the business days during such Rule 144 Quarter, of the average
     of the closing prices of the sales of such Common Stock on all securities
     exchanges on which such Common Stock may at that time be listed, or, if
     there have been no sales on any such exchange on any day, the average of
     the highest bid and lowest asked prices on all such exchanges at the end of
     such day, or, if on any day the Common Stock is not so listed, the average
     of the representative bid and asked prices quoted in the NASDAQ System as
     of 4:00 P.M., New York time, or, if on any day the Common Stock is not
     quoted in the NASDAQ System, the average of the highest bid and lowest
     asked prices on such day in the domestic over-the-counter market as
     reported by the National Quotation Bureau Incorporated, or any similar
     successor organization; and

                                      -5-
<PAGE>
 
               (ii)  with respect to consideration received in a Sale or
     Liquidation, the amount of all cash consideration received plus the fair
     market value of all other consideration received (as shall be determined in
     good faith by the New Capital Investor).

          "Nonqualified Common" means 2,019.23 of the shares of Class A Common
           -------------------                                                
purchased by the New Capital Investor under the Stock Purchase Agreement
(together with any shares issued with respect to such shares of Nonqualified
Common, including any stock splits, stock dividends, or recapitalizations);
provided that
- --------     

               (i)   contemporaneously with a Sale, the number of shares of
     Nonqualified Common that would be forfeited in connection with such Sale if
     the Return Multiple for such Sale were 35 shall (whether or not actually
     forfeited in connection with such Sale) forever cease to be Nonqualified
     Common,

               (ii)  if any holder or holders of Unvested Class C Common give(s)
     Election Notice with respect to a Rule 144 Quarter, the number of shares of
     Nonqualified Common that would be forfeited in connection with such Rule
     144 Quarter if the Return Multiple for such Rule 144 Quarter were 35 shall
     (whether or not actually forfeited in connection with such Rule 144
     Quarter) forever cease to be Nonqualified Common, and

               (iii) contemporaneously with a Liquidation or termination of
     this Agreement, any and all shares of Nonqualified Common then held by the
     New Capital Investor shall forever cease to be Nonqualified Common,

               (iv)  if any shares of an Executive Investor's Unvested Class C
     Common are repurchased pursuant to the provisions of an Executive Stock
     Agreement, or if any Executive Investor waives (pursuant to paragraph 5G
     below) his right to have any of his shares of Unvested Class C Common vest,
     a number of New Capital Investor's shares of Nonqualified Common shall vest
     equal to the number of shares of Unvested Class C Common so repurchased or
     of which the rights to vest are so waived.

          "Public Offering" means the initial underwritten sale of the company's
           ---------------                                                      
common stock pursuant to an effective registration statement under the
Securities Act filed with the Securities and Exchange Commission on Form S- I
(or a successor form adopted by the Securities and Exchange Commission);
provided that the following shall not be considered a Public Offering: (i) any
- --------                                                                      
issuance of common stock as consideration or financing for a merger or
acquisition, and (ii) any issuance of common stock or rights to acquire common
stock to employees of the Company or its Subsidiaries as part of an incentive or
compensation plan.

          "Qualified Common" means 8,750 of the shares of Class A Common
           ----------------                                             
purchased by the New Capital Investor under the Stock Purchase Agreement
(together with any shares issued with respect to such shares of Qualified
Common, including by any stock splits, stock dividends, or recapitalizations),
provided that any such share shall forever cease to be Qualified Common (i) upon
- --------                                                                        

                                      -6-
<PAGE>
 
a Liquidation, (ii) when such share has been sold or transferred in a Sale, or
(iii) upon termination of this Agreement; and further provided further that if
                                              ------------------------        
any holder of Unvested Class C Common gives Election Notice with respect to a
Rule 144 Quarter, all Rule 144 Eligible Shares for such Rule 144 Quarter shall,
for all purposes as to such electing holder, thereafter forever cease to be
Qualified Common.

          "Successor Fund" means, with respect to the New Capital Investor, any
           --------------                                                      
private equity fund formed for the principal purpose of making equity
investments, where such fund is managed by the same principal parties having
management responsibility for the New Capital Investor.

          "Total Cost and Contributions" means, with respect to each share of
           ----------------------------                                      
Qualified Common or Nonqualified Common held by the New Capital Investor on any
specified date, the sum of (i) the New Capital Investors Initial Contribution
(as that term is defined in the Stock Purchase Agreement) divided by the 
                                                          -------              
aggregate number of shares of Class A Common purchased by the New Capital
Investor under the Stock Purchase Agreement (as adjusted for stock splits, 
stock dividends, recapitalizations, and other reorganizations, the 
"Original Class A Common"), and (ii) for all Subsequent Contributions (as that
 -----------------------   
term is defined in the Stock Purchase Agreement) made by the New Capital
Investor from the date hereof through such specified date, the quotient obtained
by dividing (x) the amount of each such Subsequent Contribution by the aggregate
number of shares of Original Class A Common held by the New Capital Investor as
of the date of each such Subsequent Contribution.

          "Unvested Class C Common" means, as to each Executive Investor,
           -----------------------                                       
504.8075 of the shares of Class C Common issued as of the date hereof (together
with shares issued with respect to such shares of Unvested Class C Common as
part of any stock split, stock dividend. or recapitalization); provided that any
                                                               --------         
such share shall forever cease to be Unvested Class C Common when it has been
(i) repurchased by the Company, an Investor, or an executive employee of the
Company or its Subsidiaries pursuant to paragraph 3 of an Executive Stock
Agreement, (ii) forfeited pursuant to -the terms of this Agreement or (iii)
vested pursuant to the terms of this Agreement (at which time, such share shall
become Vested Class C Common).

          "Vested Class C Common" means all shares of Unvested Class C Common
           ---------------------                                             
that have vested pursuant to the terms of this Agreement (and thereby ceased to
be Unvested Class C Common).

          Section 4.     Pledge of Unvested Class C Common
                         ---------------------------------

          4A.  Pledge.  Each Executive Investor hereby initially pledges to the
               ------                                                          
New Capital Investor, and grants to the New Capital Investor a security interest
in such Executive Investor's Unvested Class C Common (such Executive Investor's
"Pledged Shares") as security for its duties and obligations pursuant to this
 --------------                                                              
Agreement.

                                      -7-
<PAGE>
 
          4B.  Delivery of Pledged Shares. Upon the execution of this Agreement,
               --------------------------                                       
each Executive Investor shall deliver to the New Capital Investor the
certificate(s) representing such Executive Investor's Pledged Shares, together
with duly executed forms of assignment sufficient to transfer title thereto to
the New Capital Investor.

          4C.  Status as Holder.  For purposes of determinations and
               ----------------                                     
calculations under this Agreement, each Executive Investor shall be deemed to be
the holder of such Executive Investor's Pledged Shares.

          4D.  Distributions, Other Certificates, etc.  If any Executive
               ---------------------------------------                  
Investor becomes entitled to receive or receives any securities or other
property with respect to, in substitution of, or in exchange for any of such
Executive Investor's Pledged Shares (whether as a distribution in connection
with any recapitalization, reorganization or reclassification, a stock dividend
or otherwise), or any certificate(s) representing any of such Executive
Investor's Pledged Shares, such Executive Investor shall accept such securities,
property, or certificate(s) on behalf of and for the benefit of the New Capital
Investor as additional security for such Executive Investor's obligations
hereunder and shall promptly deliver such additional security to the New Capital
Investor together with duly executed forms of assignment, and such additional
security shall be deemed to be part of such Executive Investor's Pledged Shares.

          4E.  Delivery to and by the New Capital Investor.  If the Company
               -------------------------------------------                 
issues any certificate representing Pledged Shares, the Company shall in keeping
with the purpose of paragraph 4D deliver such certificate directly to the New
Capital Investor.  If the holder of such Pledged Shares is required pursuant to
the terms of this Agreement to transfer any certificate representing Pledged
Shares to the Company for cancellation the New Capital Investor shall transfer
such certificate to the Company on behalf of such holder.

          4F.  Release of Pledged Shares upon Vesting.  Upon any of Executive
               --------------------------------------                        
Investor's Pledged Shares becoming Vested Class C Common pursuant to this
Agreement, the New Capital Investor shall deliver to such Executive Investor the
certificate or certificates representing such shares of Vested Class C Common
(or, if necessary, the New Capital Investor shall submit the certificate or
certificates representing such Vested Class C Common to the Company, and the
Company shall issue to such Executive Investor a certificate representing the
number of shares of Vested Class C Common represented by such submitted
certificate(s), and shall deliver to the New Capital Investor a certificate
(issued in such Executive Investor's name) representing the number of shares of
Class C Common which were represented by such submitted certificate(s) but which
were not Vested Class C Common and not forfeited), and such Vested Class C
Common shall no longer constitute part of such Executive Investor's Pledged
Shares.

          4G.  Voting Proxy.  Each Executive Investor hereby appoints the New
               ------------                                                  
Capital Investor as his true and lawful proxy and attorney-in-fact, with full
power of substitution, to vote all of such Executive Investor's Pledged Shares
on all matters to be voted on by the Company's shareholders.  These proxies and
powers granted by each Executive Investor pursuant to this 

                                      -8-
<PAGE>
 
paragraph 4G are coupled with an interest, and are given to secure each
Executive Investor's obligations to the New Capital Investor under this
Agreement. Such proxies and powers shall be irrevocable with respect to each
such Pledged Share (and shall survive the death, disability, incompetency, or
bankruptcy of such Executive Investor) until such time as such Pledged Share
becomes Vested Class C Common pursuant to the provisions of this Agreement and
thereby ceases to be a Pledged Share, at which time such proxy shall be deemed
revoked with respect to such share (but not with respect to any shares of such
holder that remain Pledged Shares).

          4H.  Further Assurance.  Each Executive Investor agrees that at any
               -----------------                                             
time and from time to time upon the request of the New Capital Investor, such
Executive Investor shall execute and deliver such further documents and take
such further actions as the New Capital Investor may reasonably request in order
to effect the purpose of this Agreement.

          Section 5.     Miscellaneous.
                         ------------- 

          5A.  New Capital Investor Determinations.  All calculations and other
               -----------------------------------                             
determinations under provisions of this Agreement (including the final
determination of the Fair Market Value of Rule 144 Eligible Shares) shall be
performed and made in good faith by the New Capital Investor, and such good
faith determinations shall be binding on all parties hereto.  The Company and
the Executive Investors shall deliver to the New Capital Investor such
information as the New Capital Investor may reasonably request in connection
with performing such calculations or making such determinations.

          5B.  Restrictive Legend.  Each certificate evidencing shares of
               ------------------                                        
Nonqualified Common and Unvested Class C Common shall bear the following legend:

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
          FORFEITURE PROVISIONS SET FORTH IN A VESTING AGREEMENT DATED AS OF
          NOVEMBER 27, 1996, BY AND AMONG THE ISSUER OF SUCH SECURITIES, AND
          CERTAIN PERSONS LISTED ON THE SIGNATURE PAGES ATTACHED THERETO,  AS
          AMENDED FROM TIME TO TIME PURSUANT TO ITS TERMS,  A COPY OF SUCH
          VESTING AGREEMENT SHALL BE FURNISHED WITHOUT CHARGE BY THE COMPANY TO
          THE HOLDER HEREOF UPON WRITTEN REQUEST."

The legend set forth above shall be removed from the certificates evidencing any
of the above shares when such shares cease to be Nonqualified Common or Unvested
Class C Common, as applicable.

          5C.  Complete Agreement.   This Agreement, those documents expressly
               ------------------                                             
referred to herein and other documents of even date herewith embody the complete
agreement and understanding among the parties and supersede and preempt any
prior understandings, agreements 


                                      -9-
<PAGE>
 
or representations by or among the parties,
written or oral, which may have related to the subject matter hereof in any way.

          5D.  Counterparts.  This Agreement may be executed in separate
               ------------                                             
counterparts, none of which need contain the signature of more than one party
hereto but each of which shall be deemed to be an original and all of which
taken together shall constitute one and the same agreement.

          5E.  Successors and Assigns.  Except as otherwise provided herein,
               ----------------------                                       
this Agreement shall bind the parties hereto and their respective successors and
assigns and shall inure to the benefit of and be enforceable by the parties
hereto and their respective successors and assigns. Notwithstanding the
foregoing, the Executive Investors shall not transfer any Unvested Class C
Common to any person, except (i) pursuant to the pledge and forfeiture
provisions of this Agreement, or (ii) to the executor of such Executive
Investor's estate, at which time such executor shall sign a counterpart to this
Agreement agreeing to stand in the place of the Executive Investor and be bound
by the provisions hereof with respect to such shares of Unvested Class C Common.

          5F.  Choice of Law. The corporate law of the State of Delaware shall
               -------------                                                  
govern all questions concerning the relative rights of the Company and its
stockholders.  All other questions concerning the construction, validity,
enforcement and interpretation of this Agreement and the exhibits hereto shall
be governed by the internal law, and not the law of conflicts, of the State of
Illinois.

          5G.  Amendment and Waiver.  The provisions of this Agreement may be
               --------------------                                          
amended and waived only with the prior written consent of the Company, the New
Capital Investor and the holders of a majority of the shares of Unvested Class C
Common then outstanding, and such an amendment or waiver shall be binding on all
parties; provided that any holder of Unvested Class C Common may waive the
         --------                                                         
rights under this Agreement to have the shares of Unvested Class C Common held
by such holder vest (upon such waiver, such shares the rights to vest of which
are waived shall be treated for purposes of this Agreement (including paragraph
2A(c) and Section 3) as if they had been repurchased pursuant to the repurchase
provisions of an Executive Stock Agreement.

          5H.  Notice.  Any notice provided for in this Agreement shall be in
               ------                                                        
writing and shall be deemed to have been given when personally delivered to the
recipient, three business days after being mailed to the recipient by first
class mail (postage prepaid and return receipt requested), or one business day
after being sent to the recipient by reputable overnight courier service
(charges prepaid). Such notices shall be sent to each recipient at the address
specified for such recipient in the Stock Purchase Agreement, or to such other
address or to the attention of such other person as the recipient party shall
have specified by prior written notice to the sending party. Any notice given by
a holder of Unvested Class C Common pursuant to paragraph I B hereof shall, in
addition to the other requirements for such notice set forth in paragraph I B,
state in a conspicuous manner that, subject to the conditions and determinations
contemplated thereby, the events described therein are

                                      -10-
<PAGE>
 
scheduled to occur on the 20th day following the end of the Rule 144 Quarter
(and the notice shall conspicuously specify the actual date that is such 20th
day).

          5I.  Remedies.  Each of the parties to this Agreement shall be
               --------                                                 
entitled to enforce its rights under this Agreement specifically, to recover
damages and costs (including reasonable attorney's fees) caused by any breach of
any provision of this Agreement and to exercise all other rights existing in its
favor.  The parties hereto agree and acknowledge that money damages would not be
an adequate remedy for any breach of the provisions of this Agreement and that
any party may in its sole discretion apply to any court of law or equity of
competent jurisdiction (without posting any bond or deposit) for specific
performance and/or other injunctive relief in order to enforce or prevent any
violations of the provisions of this Agreement

          5J.  Termination.  The provisions of this Agreement shall terminate
               -----------                                                   
upon the earlier of (i) the first date upon which there remains either no
Unvested Class C Common outstanding, and (ii) the seventh anniversary of the
date hereof; provided that the obligations under this Agreement with respect to
any events resulting in the termination hereof shall survive such termination.

                      *          *          *          *

                                      -11-
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first written above.

                              BATTERY VENTURES III, L.P.

                              By Battery Partners, III, L.P.


                              By:
                                 --------------------------------------

                              Its:
                                  -------------------------------------

                                /s/ Brian F. Addy       
                              -----------------------------------------  
                                    Brian F. Addy

                                /s/ John R. Barnicle
                              -----------------------------------------  
                                    John R. Barnicle

                                /s/ Joseph Beatty        
                              -----------------------------------------  
                                    Joseph Beatty

                                /s/ Robert C. Taylor, Jr.
                              -----------------------------------------  
                                    Robert C. Taylor, Jr.


                              FOCAL COMMUNICATIONS CORPORATION


                              By:    /s/ Robert C. Taylor, Jr.   
                                 --------------------------------------

                              Its:   President
                                  -------------------------------------

                                      -12-
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first Written above.


                              -----------------------------------------  
                                    New Capital Investor


                              By:   /s/
                                 --------------------------------------

                              Its:   GP
                                  -------------------------------------


 
                              -----------------------------------------  
                                    Brian F. Addy

 
                              -----------------------------------------  
                                    John R. Barnicle

 
                              -----------------------------------------  
                                    Joseph Beatty

 
                              -----------------------------------------  
                                    Robert C. Taylor, Jr.


                              FOCAL COMMUNICATIONS CORPORATION

 
                              By:
                                 --------------------------------------

                              Its:
                                  -------------------------------------

                                      -13-
<PAGE>
 
                     ASSIGNMENT SEPARATE FROM CERTIFICATE


     FOR VALUE RECEIVED, Brian F. Addy hereby sells, assigns and transfers unto
Battery Ventures III, L.P., Five Hundred Four and 8075/10,000 (504.8075) shares
of the Class C Common Stock, par value $.01 per share, of Focal Communications
Corporation, a Delaware corporation (the "Corporation") standing in his name on
the books of said Corporation represented by Certificate Number C-9, and does
hereby irrevocably constitute and appoint _____________________ attorney to
transfer the said stock on the books of the Corporation with full power of
substitution in the premises.


Dated:  November 27, 1996

                                     /s/  Brian F. Addy
                                    --------------------------------    
                                    Brian F. Addy
<PAGE>
 
                     ASSIGNMENT SEPARATE FROM CERTIFICATE


     FOR VALUE RECEIVED, John R. Barnicle hereby sells, assigns and transfers
unto Battery Ventures III, L.P., Five Hundred Four and 8075/10,000 (504.8075)
shares of the Class C Common Stock, par value $.01 per share, of Focal
Communications Corporation, a Delaware corporation (the "Corporation") standing
in his name on the books of said Corporation represented by Certificate Number
C-10, and does hereby irrevocably constitute and appoint _____________________
attorney to transfer the said stock on the books of the Corporation with full
power of substitution in the premises.


Dated:  November 27, 1996

                                     /s/  John R. Barnicle
                                    -----------------------------------    
                                    John R. Barnicle
<PAGE>
 
                     ASSIGNMENT SEPARATE FROM CERTIFICATE


     FOR VALUE RECEIVED, Joseph Beatty hereby sells, assigns and transfers unto
Battery Ventures III, L.P., Five Hundred Four and 8075/10,000 (504.8075) shares
of the Class C Common Stock, par value $.01 per share, of Focal Communications
Corporation, a Delaware corporation (the "Corporation") standing in his name on
the books of said Corporation represented by Certificate Number C-11, and does
hereby irrevocably constitute and appoint _____________________ attorney to
transfer the said stock on the books of the Corporation with full power of
substitution in the premises.


Dated:  November 27, 1996

             
                                      /s/ Joseph Beatty
                                    ---------------------------------    
                                    Joseph Beatty
<PAGE>
 
                     ASSIGNMENT SEPARATE FROM CERTIFICATE


     FOR VALUE RECEIVED, Robert C. Taylor, Jr. hereby sells, assigns and
transfers unto Battery Ventures III, L.P., Five Hundred Four and 8075/10,000
(504.8075) shares of the Class C Common Stock, par value $.01 per share, of
Focal Communications Corporation, a Delaware corporation (the "Corporation")
standing in his name on the books of said Corporation represented by Certificate
Number C-12, and does hereby irrevocably constitute and appoint
_____________________ attorney to transfer the said stock on the books of the
Corporation with full power of substitution in the premises.


Dated:  November 27, 1996

                                    /s/ Robert C. Taylor, Jr.
                                    -----------------------------------    
                                    Robert C. Taylor, Jr.
<PAGE>
 
                     EXHIBIT 10 TO STOCK PURCHASE AGREEMENT
                     --------------------------------------



Interconnection Agreement by and among Ameritech Information Industry Services
and Focal, dated October 28, 1996 - Previously filed as Exhibit 10.1 to the Form
S-4 Registration Statement on April 3, 1998.
<PAGE>
 
                    Exhibit 11 to Stock Purchase Agreement

        Form of Opinion of Bischoff, Kenney & Niehaus (Initial Closing)

<PAGE>
 
                  [Letterhead of Bischoff, Kenney & Niehaus]

                               November 27, 1996


James N. Perry, Jr.
Madison Dearborn Capital Partners, L.P.
Three First National Plaza, Suite 3800
Chicago, Illinois 60670

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies.  We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others.  As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:
<PAGE>
 
James N. Perry, Jr.
Madison Dearborn Capital Partners, L.P.
November 27, 1996
Page 2




     (i)    The Company has been duly incorporated and organized, and is validly
existing and in good standing, under the laws of the State of Delaware, and the
Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;

     (ii)   The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;

     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)   The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v)    Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)   In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

            (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

            (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;
<PAGE>
 
James N. Perry, Jr.
Madison Dearborn Capital Partners, L.P.
November 27, 1996
Page 3



            (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the transactions contemplated by such agreements, will result
     in the conditioning, restriction, or withdrawal of such certification;

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii) The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)   The offering, sale and issuance of the Class A Common under the
Stock Purchase Agreement and the other securities issued by the Company at the
Closing do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x)    The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose.  This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                                  BISCHOFF, KENNEY & NIEHAUS


                                  By:  /s/  Charles D. Niehaus
                                     -------------------------------------
                                       Charles D. Niehaus

<PAGE>
 
                   [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


Frontenac VI, L.P.
135 South LaSalle Street, Suite 3800
Chicago, Illinois 60670

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

     (i)      The Company has been duly incorporated and organized, and is
validly existing and in good standing, under the laws of the State of Delaware,
and the Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;


<PAGE>
 
Frontenac, VI L.P.
135 South LaSalle Street, Suite 3800
Chicago, Illinois 60670
Page 2

      (ii)   The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;

     (iii)   The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)    The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v)     Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)    In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

             (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

             (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

             (3) neither the Company's entering into the Stock Purchase
     Agreement or any of the other agreements of even date therewith to which
     the Company is party, nor the 


<PAGE>
 
Frontenac VI L.P.
135 South LaSalle Street, Suite 3800
Chicago, Illinois 60670
Page 3

     transactions contemplated by such agreements, will result in the
     conditioning, restriction, or withdrawal of such certification;

     (vii)   The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii)  The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)    The offering, sale and issuance of the Class A Common under the
Stock Purchase Agreement and the other securities issued by the Company at the
Closing do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x)     The Capitalization Schedule attached to the Stock Purchase
Agreement correctly sets forth the number of shares of each class of the
Company's authorized capital stock and the number of outstanding shares of each
such class as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                             BISCHOFF, KENNEY & NIEHAUS


                             By:  /s/  Charles D. Niehaus
                                ---------------------------------
                                   Charles D. Niehaus
<PAGE>
 
                  [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


Battery Ventures III, L.P.
20 William Street, Suite 200
Wellesley, Massachusetts 02181

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

     (i) The Company has been duly incorporated and organized, and is validly
existing and in good standing, under the laws of the State of Delaware, and the
Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;
<PAGE>
 
Battery Ventures III, L.P.
20 William Street, Suite 200
Wellesley, Massachusetts 02181
Page 2

     (ii)   The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;

     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)   The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v)    Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)   In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

            (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

            (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

            (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the 


<PAGE>
 
Battery Ventures III, L.P.
20 William Street, Suite 200
Wellesley, Massachusetts 02181
Page 3


     transactions contemplated by such agreements, will result in the
     conditioning, restriction, or withdrawal of such certification;

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii) The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)   The offering, sale and issuance of the Class A Common under the
Stock Purchase Agreement and the other securities issued by the Company at the
Closing do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x)    The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                             BISCHOFF, KENNEY & NIEHAUS


                             By:  /s/ Charles D. Niehaus
                                ----------------------------------- 
                                      Charles D. Niehaus
<PAGE>
 
                  [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


Brian F. Addy
Focal Communications Corporation
300 West Washington Street, Suite 1408
Chicago, Illinois 60601

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

     (i)   The Company has been duly incorporated and organized, and is
validly existing and in good standing, under the laws of the State of Delaware,
and the Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;
<PAGE>
 
Brian F. Addy
Focal Communications Corporation
Page 2

     (ii)  The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;


     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)  The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v) Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)  In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

          (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

          (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

          (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the transactions contemplated by such agreements, will result
     in the conditioning, restriction, or withdrawal of such certification;
<PAGE>
 
Brian F. Addy
Focal Communications Corporation
Page 3

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii)  The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)  The offering, sale and issuance of the Class A Common under the Stock
Purchase Agreement and the other securities issued by the Company at the Closing
do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x) The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                         BISCHOFF, KENNEY & NIEHAUS


                         By: /s/ Charles D. Niehaus
                            ----------------------------------------------------
                                 Charles D. Niehaus
<PAGE>
 
                   [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


John Barnicle, Executive Vice President
Focal Communications Corporation
300 West Washington, Suite 1408
Chicago, Illinois 60601

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

     (i) The Company has been duly incorporated and organized, and is validly
existing and in good standing, under the laws of the State of Delaware, and the
Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;
<PAGE>
 
John Barnicle, Executive Vice President
Focal Communications Corporation
Page 2

     (ii)  The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;

     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)  The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v) Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)  In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

          (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

          (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

          (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the transactions contemplated by such agreements, will result
     in the conditioning, restriction, or withdrawal of such certification;
<PAGE>
 
John Barnicle, Executive Vice President
Focal Communications Corporation
Page 3

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii)  The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)  The offering, sale and issuance of the Class A Common under the Stock
Purchase Agreement and the other securities issued by the Company at the Closing
do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x) The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                         BISCHOFF, KENNEY & NIEHAUS


                         By: /s/ Charles D. Niehaus
                            ----------------------------------------------------
                              Charles D. Niehaus
<PAGE>
 
                   [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


Robert C. Taylor, Jr., President
Focal Communications Corporation
300 West Washington Street, Suite 1408
Chicago, Illinois 60601

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

          (i) The Company has been duly incorporated and organized, and is
validly existing and in good standing, under the laws of the State of Delaware,
and the Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;
<PAGE>
 
Robert C. Taylor, Jr., President
Focal Communications Corporation
Page 2

     (ii)  The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;


     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)  The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v) Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)  In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

          (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

          (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

          (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the transactions contemplated by such agreements, will result
     in the conditioning, restriction, or withdrawal of such certification;
<PAGE>
 
Robert C. Taylor, Jr., President
Focal Communications Corporation
Page 3

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii)  The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)  The offering, sale and issuance of the Class A Common under the Stock
Purchase Agreement and the other securities issued by the Company at the Closing
do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x) The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                         BISCHOFF, KENNEY & NIEHAUS


                         By:  /s/ Charles D. Niehaus
                            ----------------------------------------------------
                              Charles D. Niehaus
<PAGE>
 
                   [Letterhead of Bischoff, Kenney & Niehaus]


                               November 27, 1996


Joseph Beatty
Focal Communications Corporation
300 West Washington, Suite 1408
Chicago, Illinois 60601

Gentlemen:

     We are counsel to Focal Communications Corporation (the "Company") in
connection with a transaction whereby the capital structure of the Company will
be recapitalized, the Restated Certificate of Incorporation will be amended and
new shareholders will be issued certain classes of Common Stock, all pursuant to
agreements dated herewith by and among all or some Focal Communications
Corporation, Madison Dearborn Capital Partners, L.P., Frontenac VI, L.P.,
Battery Ventures III, L.P., Brian F. Addy, John R. Barnicle, Joseph A. Beatty,
and Robert C. Taylor, Jr. and described as follows: Stock Purchase Agreement,
Executive Stock Agreement and Employment Agreement, Stockholders Agreement,
Registration Agreement, and Vesting Agreements (hereinafter all commonly
referred to as the "Agreements" and the transaction hereinafter commonly
referred to as the "Transaction").  This opinion is being delivered to you
pursuant to Paragraph 2K of the Stock Purchase Agreement.

     For purposes of this opinion, we have examined the corporate records of the
Company, including but not limited to the Certificate of Incorporation, the
Restated Certificate of Incorporation, the Bylaws in effect prior to the date
hereof and the Bylaws adopted as of the date hereof, the Resolutions of
Shareholders and the Board of Directors, and such other documents as we have
deemed necessary under the circumstances.  In making our examination, we have
assumed the genuineness of the signatures on all original documents, and the
conformity to original documents of all copies submitted to us as facsimile,
photostatic or conformed copies. We have assumed that the amended and Restated
Certificate of Incorporation, which shall be filed as of the date herewith,
shall be accepted and duly recorded by the Secretary of State of Delaware as of
the date hereof.  As to various questions of fact material to our opinion, we
have relied upon statements or certificates of officers or representatives of
the Company and others. As to various questions of fact and law material to our
opinion, we have relied upon statements or certificates of public officials.

     Based upon and subject to the foregoing, it is our opinion that:

     (i) The Company has been duly incorporated and organized, and is validly
existing and in good standing, under the laws of the State of Delaware, and the
Company has all necessary corporate power and authority and all material
licenses, permits and authorizations necessary to own its properties in the
locations presently owned and to conduct its business in the manner and in the
locations now conducted;
<PAGE>
 
Joseph Beatty
Focal Communications Corporation
Page 2

     (ii)  The Company has all necessary corporate power and authority to
execute, deliver and perform its obligations under the Agreements;


     (iii)  The Interconnection Agreement and the Agreements have been duly
authorized, executed and delivered by the Company, and each Agreement is a valid
and binding obligation of the Company, enforceable in accordance with its terms;

     (iv)  The execution and delivery by the Company of the Agreements, the
offering, sale and issuance of the Class A Common, and the fulfillment of and
the compliance with the respective terms thereof by the Company do not and shall
not (A) conflict with or result in a breach of the terms, conditions or
provisions of, (B) constitute a default under, (C) result in the creation of any
lien, mortgage, security interest, charge or other encumbrance upon the
Company's capital stock or assets pursuant to, (D) give any third party the
right to accelerate any obligation under, (E) result in a violation of, or (F)
require any authorization, consent, approval, exemption or other action by or
notice to any court or administrative or governmental body pursuant to, the
Company's Restated Certificate of Incorporation, the Company's Bylaws, any law,
statute, rule or regulation to which the Company is subject, or any material
agreement, indenture, instrument, order, judgment or decree to which the Company
is subject;

     (v) Brian F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C.
Taylor, Jr., have each executed and delivered an Executive Stock Agreement and
Employment Agreement and the Stockholders Agreement, and each such agreement is
a valid and binding obligation of each such person, enforceable in accordance
with its terms;

     (vi)  In November, 1996, the Illinois Commerce Commission certified the
Company to provide facilities-based and resold, switched and dedicated, local
exchange services in those portions of MSA-1 served by Ameritech and Centel, and
interexchange services throughout Illinois:

          (1) such certification has not been conditioned, restricted,
     withdrawn, and is not presently under challenge;

          (2) the Company has filed all statements and reports, obtained all
     consents, licenses, and approvals, and taken all other material actions
     required by the ICC, FCC, or other laws or regulations, necessary to
     maintain such certification and to provide such services in the Chicago
     MSA;

          (3) neither the Company's entering into the Stock Purchase Agreement
     or any of the other agreements of even date therewith to which the Company
     is party, nor the transactions contemplated by such agreements, will result
     in the conditioning, restriction, or withdrawal of such certification;
<PAGE>
 
Joseph Beatty
Focal Communications Corporation
Page 3

     (vii)  The restatement to the Company's Certificate of Incorporation
containing the provisions set forth in Exhibit 2 to the Stock Purchase Agreement
has been duly adopted by the Company, has been duly filed with the Secretary of
State of Delaware, has become effective under the laws of Delaware and
constitutes a valid and binding obligation of the Company, enforceable in
accordance with its terms;

     (viii)  The certificates representing the Class A Common purchased at the
Closing have been duly authorized, executed and delivered by the Company, such
Class A Common has been validly issued and is outstanding, fully paid and
nonassessable, and there are no statutory, or contractual, preemptive rights of
stockholders or rights of first refusal with respect to the issuance of such
Class A Common;

     (ix)  The offering, sale and issuance of the Class A Common under the Stock
Purchase Agreement and the other securities issued by the Company at the Closing
do not require registration under the Securities Act or registration or
qualification under any state securities laws;

     (x) The Capitalization Schedule attached to the Stock Purchase Agreement
correctly sets forth the number of shares of each class of the Company's
authorized capital stock and the number of outstanding shares of each such class
as of the Closing;

     This opinion has been furnished to you in accordance with Paragraph 2K of
the Stock Purchase Agreement and may not be relied upon by any other person or
for any other purpose. This opinion is based on existing Delaware and federal
laws, rules and regulations.

     We express no opinion as to laws, rules or regulations other than these.
This opinion is limited to those matters expressly stated and no opinion shall
be inferred or applied beyond such matters.

                         BISCHOFF, KENNEY & NIEHAUS


                         By:  /s/ Charles D. Niehaus
                            ----------------------------------------------------
                              Charles D. Niehaus
<PAGE>

                    EXHIBIT 12 TO STOCK PURCHASE AGREEMENT

                    FORM OF OPINION FOR SUBSEQUENT CLOSINGS
                    ---------------------------------------


     It is our opinion that:

           (i)    The Company has been duly incorporated and organized, and is 
     validly existing and in good standing, under the laws of the State of
     Delaware, and the Company has all necessary corporate power and authority
     and all material licenses, permits and authorizations necessary to own its
     properties in the locations presently owned and to conduct its business in
     the manner and in the locations now conducted;

           (ii)   Each of the Interconnection Agreement, [other material 
     Interconnection Agreements], the Stock Purchase Agreement, the Registration
     Agreement, the Stockholders Agreement, and the other agreements
     contemplated by the Stock Purchase Agreement to which the Company and Brian
     F. Addy, John R. Barnicle, Joseph A. Beatty, and Robert C. Taylor, Jr. is a
     party has been duly authorized by such person and remains a valid and
     binding obligation of such person, enforceable in accordance with its
     terms;

           (iii)  In _____________, the __________ Commerce Commission certified
     the Company to provide facilities-based and resold, switched and dedicated,
     local exchange services in those portions of ________ served by ________,
     and interexchange services throughout ________;

                  (1)  such certification has not been conditioned, restricted, 
           withdrawn, and is not presently under challenge;

                  (2)  the Company has filed all statements and reports, 
           obtained all consents, licenses, and approvals, and taken all other
           material actions required by the _CC, FCC, or other laws or
           regulations, necessary to maintain such certification and to provide
           such services in the _______ MSA;

                  (3)  neither the Company's entering into the Stock Purchase 
           Agreement or any of the other agreements of even date therewith to
           which the Company is party, nor the transactions contemplated by such
           agreements, will result in the conditioning, restriction, or
           withdrawal of such certification;

           (iv)   The Capitalization Schedule attached to _______ correctly sets
     forth the number of shares of each class of the Company's authorized
     capital stock and the number of outstanding shares of each such class as of
     the Closing;

     This opinion has been furnished to you in accordance with Paragraph 3F of 
the Stock Purchase Agreement and may not be relied upon by any other person or 
for any other purpose.  This opinion is based on existing Delaware and federal 
laws, rules and regulations.  We express no opinion 


<PAGE>
 
as to laws, rules or regulations other than these. This opinion is limited to
those matters expressly stated and no opinion shall be inferred or applied
beyond such matters.



<PAGE>
 
                  EXHIBIT 13 TO THE STOCK PURCHASE AGREEMENT

                                CONFIDENTIALITY
                                ---------------
                                      AND
                                      ---
                           NONCOMPETITION AGREEMENT
                           ------------------------

     This Agreement ("Agreement") made this ___ day of ___________, 19__, by and
between Focal Communications Corporation, a Delaware corporation (the "Company")
and ___________, an individual resident of the State of ___________ (the "Key 
Employee").

     WHEREAS, the Key Employee is desirous of being in the Company's employment 
as an at-will employee based upon the conditions set forth in this Agreement; 
and

     WHEREAS, the Key Employee will have access to and be entrusted with 
confidential and proprietary information of the Company; and 

     WHEREAS, the Company wishes to employ the Key Employee as an at-will 
employee, but is willing to do so only if the Key Employee agrees to be bound by
the terms of this Agreement, and, in further consideration of the Key Employee's
execution hereof, the Company will pay to the Key Employee the sum of $1,000.00 
upon the execution of this Agreement.

     NOW, THEREFORE, in consideration of being in the Company's employment as an
at-will employee, in that the employment may be terminated by the Key Employee 
or the Company at any time, for any reason or no reason, with or without notice,
and in further consideration of the material covenants and agreements contained 
herein, including the Company's payment to the Key Employee of $_______________
upon execution of this Agreement, the parties hereto, each intending to be 
legally bound, covenant and agree as follows:

     Section 1. At-will Employment. In consideration of being employed as an 
     ---------  ------------------
at-will employee, in that the Key Employee or the Company can terminate 
employment at any time, for any reason or no reason, with or without notice, the
employee agrees to the at-will employment condition as set forth herein, as well
as all conditions as are or may be from time to time promulgated by the Company.
<PAGE>
 
      Section 2. Covenant not to Compete. Key Employee acknowledges and agrees 
      ---------  -----------------------
that if, after the termination of his employment, he performs certain services 
for any entity that is engaged in a similar business or entity competing with 
the Company, that such any entity would obtain an unfair advantage over the 
Company due to the knowledge and management information that the Key Employee 
has gained by reason of his employment hereunder. Key Employee acknowledges and 
agrees that the Company has a legitimate interest in being protected from the 
Key Employee's employment by an entity that engages in a similar business or 
competes with the Company. Key Employee hereby agrees to the following 
restrictions (in addition to those contained in Sections 3, 4, 5 and 6): During 
the term of his employment pursuant hereto and for a period of eighteen (18) 
months after the termination of employment (the "Noncompetition Period"), the 
Key Employee will not, directly or indirectly, (whether as sole proprietor, 
partner or venturer, stockholder, director, officer, employee or consultant or 
any other capacity as principal or agent or through any person, subsidiary or 
employee acting as nominee or agent):

           (a) Conduct or engage in or be interested or associated with any 
person, firm, association, partnership, corporation, or other entity which 
conducts or engages in a similar business or competes with the Company in any 
geographic area where the Company is conducting business at the time of the 
termination of the Key Employee's employment, or in any geographic area where 
the Company has planned to conduct business and such Key Employee has knowledge 
of such plan(s). (The Restricted Area);

           (b) Take any action, directly or indirectly, to finance, guarantee, 
or provide any other material assistance to any person, firm, association, 
partnership, corporation, or other entity which conducts or engages in a similar
business or competes with the Company in the Restricted Area; 

           (c) Influence or attempt to influence any person, firm, association, 
partnership, corporation, or other entity who is a contracting party with the 
Company at any time during the Noncompetition Period to terminate any written or
oral agreement with the Company;

           (d) Hire or attempt to hire for employment any person who is employed
by the Company or attempt to influence any such person to terminate employment 
with the Company; or 

           (e) Call on, solicit, or take away as a client or customer or attempt
to call on, solicit or take away as a client or customer any person, firm, 
association, partnership, corporation, or other entity that was a client or 
customer of the Company, including actively sought prospective customers, with 
whom the Key Employee had material contact during the term of his employment 
that 
<PAGE>
 
was serviced by or under the supervision of the Key Employee during the term of 
such employment; provided, however, that nothing herein shall prohibit the Key 
Employee from general advertising and marketing efforts not specifically 
targeting such clients or customers of the Company.

     This covenant shall apply and inure to the benefit of any assignee of the 
Company.  The restrictive provisions of this Agreement shall not prohibit Key 
Employee from having an equity interest in the securities of any corporation 
engaged in a similar business to that of the Company, which are listed on a 
recognized securities exchange or traded in the over-the-counter market to the 
extent that such interest does not exceed one percent (1%) of such corporation 
or does not constitute control of such corporation.

     Section 3. Confidential Information.  Key Employee acknowledges and agrees 
     ---------  ------------------------
that all nonpublic information concerning the Company's business relating, 
without limitation, to (i) products or services, (ii) fees, costs and pricing 
structures, (iii) designs, (iv) analysis, (v) drawings, photographs and reports,
(vi) computer software, including operating systems, applications and program 
listings, (vii) flow charts, manuals and documentation, (viii) data basis, (ix) 
accounting and business methods, (x) inventions, devices, new developments, 
methods and processes, whether patentable or unpatentable and whether or not 
reduced to practice, (xi) customers and clients and customer or client lists, 
(xii) copyrightable works, (xiii) all technology and trade secrets (xiv) 
business plans and financial models, and (xv) all similar and related 
information in whatever form (collectively, the "Confidential Information") is 
and shall remain the property of the Company.  The Key Employee recognizes and 
agrees that all of the Confidential Information, whether developed by Key 
Employee or made available to Key Employee, other than information that is 
generally known to the public, is a unique asset of the Company, the disclosure 
of which would be damaging to the Company.  Key Employee agrees that he will 
not at any time during the term of his employment or for a period of eighteen 
(18) months after the termination of employment, directly or indirectly, 
disclose to any person any Confidential Information of the Company, other than 
information that is already know to the public, except as may be required in the
ordinary course of business of the Company or as may be required by law.

     Section 4.  Property of the Company.  Key Employee acknowledges that from 
     ---------   -----------------------
time to time in the course of providing services pursuant to this Agreement, he 
shall have the opportunity to inspect and use certain property, both tangible 
and intangible, of the Company, including Confidential Information, and Key 
Employee hereby agrees that such property shall remain the exclusive property of
the Company.


<PAGE>
 
     Section 5. Intangible Assets.  Key Employee shall never at any time have or
     ---------  ----------------
claim any right, title, or interest in any trade name, trademark, copyright, 
patent, whether registered or unregistered, or other similar rights belonging to
or used by the Company and shall never have or claim rights, title, or interest 
in any material matter of any sort prepared for or used in connection with the 
business or promotion of the Company, whether produced, prepared, or published 
in whole or in part by the Company.

     Section 6.  The Company Ownership of Intellectual Property.
     ---------   ----------------------------------------------

     (a)   Acknowledgment of Company Ownership.  In the event that Key Employee,
           -----------------------------------
as part of his activities on behalf of the Company, generates, authors or 
contributes to any invention, design, new development, device, product, method 
or process (whether or not patentable or reduced to practice or constituting 
Confidential Information), any copyrightable work (whether or not constituting 
Confidential Information) or any other form of Confidential Information relating
directly or indirectly to the Company's business as now or hereinafter conducted
(collectively, "Intellectual Property"), Key Employee acknowledges that such 
Intellectual Property is the exclusive property of the Company and hereby 
assigns all right, title and interest in and to such Intellectual Property to 
the Company.  Any copyrightable work prepared in whole or in part by Key 
Employee will be deemed "a work made for hire" under Section 201(b) of the 1976
Copyright Act, and the Company shall own all of the rights comprised by the 
copyright therein.  Key Employee shall promptly and fully disclose all 
Intellectual Property to the Company and shall cooperate with the Company to 
protect the Company's interests in and rights to such Intellectual Property 
(including, without limitation, providing reasonable assistance in securing 
patent protection and copyright registrations and executing all documents as 
reasonably requested by the Company, whether such requests occur prior to or 
after termination of Key Employee's employment with the Company).

     (b)   Delivery of Materials Upon Termination of Employment.  As requested 
           ----------------------------------------------------
by the Company from time to time and upon the termination of Key Employee's 
employment with the Company, Key Employee shall promptly deliver to the Company 
all copies and embodiments, in whatever form, of all Confidential Information
and Intellectual Property in Key Employee's possession or within his control
(including, but not limited to, written records, notes, photographs, manuals,
notebooks, documentation, program listings, flow charts, magnetic media, disks,
diskettes, tapes and all other materials containing any Confidential Information
or Intellectual Property) irrespective of the
<PAGE>
 
location or form of such material and, if requested by the Company, shall 
provide the Company with written confirmation that all such materials have been 
delivered to the Company.

     Section 7. Remedies.  The parties hereby acknowledge and agree that the 
     ---------  --------
services to be rendered by the Key Employee and the various rights granted to 
the Key Employee hereunder are special, unique and of extraordinary character 
which gives a peculiar value to the Company which is impossible of replacement 
and for the loss of which the Company cannot reasonably or adequately be 
compensated in damages, and Key Employee acknowledges and agrees that a breach 
by him/her of this Agreement will cause the Company irreparable injury and 
damage.  Therefore, Key Employee expressly agrees that in the event of a breach 
by the Key Employee of the provisions of Sections 2, 3, 4, 5 or 6 hereunder, the
Company shall be entitled to injunctive and other equitable relief to remedy
such breach of this Agreement, or any part thereof, and to secure its
enforcement, in addition to any other remedy to which the Company might be
entitled.

     Section 8. Waiver.  No delay or failure on the part of any party hereto in 
     ---------  ------
exercising any right, power, or privilege under this Agreement or any other 
documents furnished in connection with or pursuant to this Agreement shall 
impair any such right, power, or privilege or be construed as a waiver of any 
default or any acquiescence therein.  No single or partial exercise of any such 
right, power, or privilege shall preclude the further exercise of such right, 
power, or privilege, or the exercise of any other right, power, or privilege.  
No waiver shall be valid against any party hereto unless made in writing and 
signed by the party against whom enforcement of such waiver is sought and then 
only to the extent expressly specified therein.

     Section 9. Governing Law.  This Agreement, the rights and obligations of 
     ---------  -------------
the parties hereto, and any claims or any disputes related hereto, shall be 
governed by and construed in accordance with the laws of the State of _________.
                                                                      
     Section 10. Binding Effects.  Subject to any provisions hereof restricting
     ----------  ---------------
assignment, this Agreement shall be binding upon and shall inure to the benefit 
of the parties hereto and their respective successors, heirs, executors, 
administrators, legal representatives and assigns.

     Section 11. Acknowledgment.  The Key Employee has been provided a 
     ----------  --------------
reasonable amount of time to have this document reviewed by legal counsel, has 
been fully made aware of his rights, duties and obligations hereunder, or has 
elected not to have such reviewed by counsel but fully understands the terms and
conditions of this Agreement and the ramifications of breaching this Agreement.


<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement, 
or have caused this Agreement to be duly executed on their behalf as of the day 
and year first above written.

WITNESSES:                              FOCAL COMMUNICATIONS CORPORATION


                                        By:
- ----------------------------------         ---------------------------------

                                        Print Name:
- ----------------------------------                 -------------------------

                                        Print Title:
                                                    ------------------------


                                        KEY EMPLOYEE


                                        By:
- ----------------------------------         ---------------------------------

- ---------------------------------- 
<PAGE>
 
               DISCLOSURE SCHEDULES TO STOCK PURCHASE AGREEMENT




Licenses Schedule

Capitalization Schedule

Liabilities Schedule

Assets Schedule

Contracts Schedule

Intellectual Property Schedule

Litigation Schedule

Consents Schedule

Affiliated Transcations Schedule












<PAGE>
 
                             7A. LICENSES SCHEDULE
                             ---------------------

1. Permit to conduct business in the city of Chicago.







<PAGE>
 
                        7B(i). CAPITALIZATION SCHEDULE
                        ------------------------------


As of November 25, 1996, the Capital Stock of the Company is as follows:


Common Stock, no par

     Authorized Shares    1,500
     Outstanding Shares   1,500

As of the initial Closing and immediately thereafter, the capital stock of the
Company shall be as follows:


Class A Common, $.01 par value


     Authorized Shares    80,000
     Outstanding Shares   79,384.62


Class B Common, $.01 par value


     Authorized Shares    20,000
     Outstanding Shares   20,000

Class C Common, $.01 par value


     Authorized Shares    15,000
     Outstanding Shares   14,711.54


<PAGE>
 
                                7D. LIABILITIES
                                ---------------


Prior to the Initial Closing, the Company has incurred the following expenses,
obligations or liabilities:

Liabilities:


        Reed, Smith, Shaw & McClay                  $12,656.74
        
        Swidler & Berlin                            $   598.84

        Kirkland & Ellis                        Unknown as of Closing
        
        Skadden, Arps, Slate, Meagher & Flom    Unknown as of Closing

        Arthur Andersen L.P.                    Unknown as of Closing

        Bischoff, Kenney & Niehaus              Unknown as of Closing





<PAGE>
 
                              7E. ASSETS SCHEDULE
                              -------------------


General office materials and equipment, the value of which does not exceed
$1,000.00.

<PAGE>
 
                             7G. CONTRACTS SCHEDULE
                             ----------------------


Prior to Initial Closing, the Company and/or any subsidiary is a party to or 
bound by the following written and/or oral agreements:


       1. Letter of Intent with Data Center Design and Development for design 
and construction of central office space, November 18, 1996.


       2. Letter of Intent with Northern Telecom, Inc. for procurement of one
DMS-500 central office switching system, October 9, 1996.


       3. Letter of firm commitment with Northern Telecom, Inc. to purchase 
minimum of six DMS-500 central office switching systems, October 9, 1996.


       4. Interconnection Agreement with Ameritech Information Industry
Services, October 28, 1996.


       5. Letter of Intent with Miglin-Beitler Management Corporation to lease
200 N. LaSalle for central office and general corporate office space, October 
24, 1996.


       6. Employee health insurance agreement with Brockford & Company, 
August  1, 1996.


       7. Enhanced 9-1-1 Service Agreement with Ameritech Infomation Industry
Services, October 28, 1996.


       8. Directory Assistance Agreement with Ameritech Information Services, 
October 28, 1996.


       9. Switched Access Meet Point Billing Agreement with Ameritech 
Information Industry Services, October 28, 1996.
<PAGE>
 
                      7H. INTELLECTUAL PROPERTY SCHEDULE
                      ----------------------------------


(a)  Patented or registered Intellectual Property Rights owned or used by the
     Company or any Subsidiary:


           NONE

(b)  Pending patent applications for registration of other Intellectual
     Property Rights filed by the Company or any Subsidiary:

           (1) Federal application for service mark:
                 FOCAL COMMUNICATIONS CORPORATION

           (2) Federal application for service mark:
                 FOCAL 

           (3) Federal application for service mark:
                 FOCAL AND DESIGN (Logo)

(c)  Unregistered trade names and corporate names owned or used by the Company
     or any Subsidiary:

           NONE

(d)  Unregistered trademarks and service marks:

     (1) Slogan:
           FOCUSED ON LOCAL COMMUNICATIONS

     (2) Slogan:
           FUNCTIONALLY EQUIVALENT, TECHNICALLY
           SUPERIOR, LOW COST TELECOMMUNICATIONS
           SERVICES
                 
<PAGE>
 
                            7I. LITIGATION SCHEDULE
                            -----------------------


NO EXCEPTION
<PAGE>
 
                             7K. CONSENTS SCHEDULE
                             ---------------------


SEE ALSO LICENSES SCHEDULE
         -----------------

1. Permit to conduct business in the City of Chicago.

2. Building Permits as necessary from the City of Chicago.

3. Permits, if any, required from other jurisdictions upon implementation of 
   such Subsequent Business Plan(s) contemplated hereunder.
<PAGE>
 
                     7M. AFFILIATED TRANSACTIONS SCHEDULE
                     ------------------------------------
NO EXCEPTION



<PAGE>
 
    
*Certain portions of this Exhibit have been omitted where indicated by an "*"
 pursuant to a request for confidential treatment, and the omitted portions have
 been separately filed with the Commission.       

                                                                    Exhibit 10.5

                       NETWORK PRODUCTS PURCHASE AGREEMENT

Northern Telecom Inc., a Delaware corporation having offices at 2350 Lakeside
Bvld., Richardson, TX, 75082 ("Nortel") and Focal Communications Corporation, a
Delaware corporation, having its principal offices and place of business at 300
W. Washington Street, Suite 1408, Chicago, IL 60606 ("Buyer") agree as follows:

1.       SCOPE

         1.1      Certain terms used in this Agreement shall be defined as set
                  forth in Exhibit A.

         1.2      The terms and conditions of this Agreement shall apply to the
                  purchase by Buyer and the sale by Nortel of Equipment and
                  Services and the licensing of Software furnished in connection
                  with such Equipment. The terms and conditions contained in a
                  Product Attachment shall modify and/or supplement the other
                  terms and conditions of this Agreement, only with respect to
                  the Product Line and Services described in the Product
                  Attachment, subject to Section 18.6 herein.

         1.3      All Products and Services obtained by Buyer pursuant to this
                  Agreement shall be obtained by Buyer solely for initial use by
                  Buyer in its internal business to provide services available
                  through its networks, and not as stock in trade or inventory
                  which is intended for resale by Buyer to any third party as
                  new and unused material. All such Products shall be installed
                  in the United States.

2.       TERM

         2.1      This Agreement shall be in effect during the period that any
                  Product Attachment is in effect. Each Product Attachment shall
                  be in effect during its Product Attachment Term. This
                  Agreement or any part thereof may be terminated in accordance
                  with the express provisions of this Agreement concerning
                  termination or by written agreement of the parties.

         2.2      The termination of this Agreement or any part thereof shall
                  not affect the obligations of either party thereunder which
                  have not been fully performed with respect to any accepted
                  Order, unless such Order is expressly terminated in accordance
                  with this Agreement or by written agreement of the parties.

3.       ORDERING

         All purchases pursuant to this Agreement shall be made by means of
         Orders issued from time to time by Buyer and accepted by Nortel in
         writing within fifteen (15) days. Otherwise, any such Order shall be
         deemed to be void. Should Nortel not accept an Order, Nortel shall
         advise the Buyer in writing of the reason or reasons that the Order was
         not accepted and shall
<PAGE>
 
         provide the Buyer the opportunity to correct the Order so that it may
         be accepted by Nortel. All Orders shall reference this Agreement and
         the applicable Product Attachment and shall be governed solely by the
         terms and conditions set forth herein as modified and/or supplemented
         pursuant to Section 1.2 by the terms and conditions of any applicable
         Product Attachments.

4.       PRICES

         4.1      The prices, charges, and fees applicable to Orders shall be
                  set forth in the appropriate Product Attachments and may be
                  revised in accordance with the provisions stated therein.
                  Buyer shall pay transportation charges, including insurance,
                  in accordance with the applicable Product Attachment.

         4.2      Until the total of all prices, charges and fees for Products
                  and related Services furnished hereunder shall have been paid
                  to Nortel, Buyer shall cooperate with Nortel in perfecting
                  Nortel's purchase money security interest in such Products and
                  Buyer shall promptly execute all documents and take all
                  actions required by Nortel in connection therewith. Unless
                  otherwise agreed in writing Buyer shall not sell, lease or
                  otherwise transfer such Products or any portion thereof or
                  allow any liens or encumbrances to attach to such Products or
                  any portion thereof prior to payment in full to Nortel of the
                  total of all such prices, charges, and fees.

5.       TERMS OF PAYMENT

         5.1      The amounts payable for Products and/or Services may be
                  invoiced by Nortel to Buyer in accordance with the applicable
                  Product Attachments. All amounts payable and properly invoiced
                  pursuant to this Agreement shall be paid by Buyer to Nortel
                  within thirty (30) days from the date of Nortel's invoice in
                  accordance with the payment instructions contained in such
                  invoice.

         5.2      Overdue payments, excluding those which are the subject of a
                  good faith dispute, shall be subject to interest charges,
                  calculated daily commencing on the 31st day after the date of
                  the invoice, at one and one half percent (11/2%) per month or
                  such lesser rate as may be the maximum permissible rate under
                  applicable law.

6.       TAXES

         Buyer shall at Nortel's direction promptly pay to Nortel or pay
         directly to the applicable government or taxing authority, if requested
         by Nortel, all taxes and charges, including, without limitation,
         penalties and interest, which may be imposed by any federal, state, or
         local governmental or taxing authority arising hereunder, such as, but
         not limited to all such taxes and charges relating to the purchase,
         license, ownership, possession, use, operation and/or relocation of any
         Equipment, Software, or Services furnished by Seller pursuant to

                                       2
<PAGE>
 
         this Agreement, excluding, however, all taxes computed upon the net
         income of Nortel. Buyer's obligations pursuant to this Section 6 shall
         survive any termination of this Agreement.

7.       RISK OF LOSS, TITLE

         7.1      Risk of loss or damage to Products shall pass to Buyer upon
                  delivery to the loading dock at the installation site or other
                  delivery location specified by Buyer in its Order, and Buyer
                  shall keep such Products fully insured for the total amount
                  then due Nortel for such Products. Nortel shall bear the risk
                  of loss or damage to the Products if the loss or damages is
                  the result of Nortel's negligence or willful misconduct.

         7.2      Good title to Equipment furnished hereunder which shall be
                  free and clear of all liens and encumbrances shall vest in
                  Buyer upon full payment by Buyer of the total prices, charges
                  and fees payable by Buyer for such Equipment and any related
                  Software or Services furnished by Nortel in connection with
                  such Equipment.

         7.3      Buyer shall receive a license to use Software subject to the
                  terms set forth in Exhibit B.

8.       TESTING, TURNOVER AND ACCEPTANCE

         8.1      If Nortel installs any Products furnished hereunder, the
                  rights and obligations of the parties with respect to testing,
                  turnover and acceptance of such Products shall be as set forth
                  in the applicable Product Attachment.

         8.2      If Nortel does not install Products furnished hereunder,
                  Nortel shall prior to delivery of the Products perform such
                  factory tests as Nortel determines to be appropriate in order
                  to confirm that such Products shall be in accordance with the
                  applicable Specifications. Buyer shall be deemed to have
                  accepted the Products upon completion of such tests.

         8.3      In the event that Buyer places Products into
                  revenue-generating service, such Products shall be deemed to
                  have been accepted by Buyer without limitation or restriction.

         8.4      Acceptance of the Products by Buyer shall not constitute a
                  waiver by Buyer of its rights under the Warranty provisions
                  set forth in Exhibit D of this Agreement.

9.       DISCLAIMERS OF WARRANTIES AND REMEDIES

         THE WARRANTIES AND REMEDIES SET FORTH IN EXHIBIT D AND IN ANY
         PRODUCT ATTACHMENT CONSTITUTE THE ONLY WARRANTIES OF

                                       3
<PAGE>
 
         NORTEL WITH RESPECT TO THE PRODUCTS AND SERVICES AND BUYER'S
         EXCLUSIVE REMEDIES IN THE EVENT SUCH WARRANTIES ARE
         BREACHED. THEY ARE IN LIEU OF ALL OTHER WARRANTIES WRITTEN OR
         ORAL. STATUTORY, EXPRESS OR IMPLIED. INCLUDING WITHOUT
         LIMITATION ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
         PARTICULAR PURPOSE. NORTEL SHALL NOT BE LIABLE FOR ANY
         INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY NATURE
         WHATSOEVER. BEFORE OR AFTER THE PLACING OF ANY PRODUCT INTO
         SERVICE.

10.      LIABILITY FOR BODILY INJURY, PROPERTY DAMAGE AND PATENT
         INFRINGEMENT

         10.1     A party hereto shall defend the other party against any suit,
                  claim, or proceeding brought against the other party for
                  direct damages due to bodily injuries (including death) or
                  damage to tangible property which allegedly result from the
                  negligence or willful misconduct of the defending party in the
                  performance of this Agreement. The defending party shall pay
                  all litigation costs, reasonable attorney's fees, settlement
                  payments and such direct damages awarded or resulting from any
                  such suit, claim or proceeding.

         10.2     Nortel shall defend Buyer against any suit, claim or
                  proceeding brought against Buyer alleging that any Products,
                  excluding Vendor Items, furnished hereunder infringe any
                  United States patent. Nortel shall pay all litigation costs,
                  reasonable attorney's fees, settlement payments and any
                  damages awarded or resulting from any such suit, claim or
                  proceeding. With respect to Vendor Items, Nortel shall assign
                  any rights with respect to infringement of U.S. patents
                  granted to Nortel by the supplier of such Vendor Items to the
                  extent of Nortel's right to do so.

         10.3     The party entitled to defense pursuant to Section 10.1 or 10.2
                  shall promptly advise the party required to provide such
                  defense of the applicable suit, claim, or proceeding and shall
                  cooperate with such party in the defense or settlement
                  thereof. The party required to provide such defense shall have
                  sole control of the defense of the applicable suit, claim, or
                  proceeding and of all negotiations for its settlement or
                  compromise.

         10.4     If an injunction is obtained against Buyer's use of any
                  Products as a result of any suit, claim, or proceeding
                  described in Section 10.2, Nortel shall at Nortel's option use
                  its reasonable efforts to either:

                  10.4.1   procure for Buyer the right to continue using the
                           portions of the Products enjoined from use; or

                                       4
<PAGE>
 
                  10.4.2   within a reasonable time, replace or modify the same
                           with equivalent or better Products so that Buyer's
                           use is not subject to any such injunction.

         10.5     If Nortel cannot perform under Section 10.4.1 or 10.4.2, Buyer
                  shall have the right to return the infringing Products to
                  Nortel upon written notice to Nortel, and in the event of such
                  return, neither party shall have any further liabilities or
                  obligations under this Agreement on account of such
                  infringement or return, except Nortel shall refund the
                  depreciated value of such Products carried on Buyer's books at
                  the time of such return, less any outstanding monies due
                  Nortel hereunder.

         10.6     The obligations of Nortel hereunder with respect to any suit,
                  claim, or proceeding described in Section 10.2 shall not apply
                  with respect to Products which are (a) manufactured or
                  supplied by Nortel in accordance with any design or any
                  special instruction furnished by Buyer, (b) used by Buyer in a
                  manner or for a purpose not contemplated by this Agreement,
                  (c) located by Buyer outside the United States, or (d) used by
                  Buyer in combination with other products not provided by
                  Nortel, including, without limitation, any software developed
                  solely by Buyer through the permitted use of Products
                  furnished hereunder, provided the infringement arises from
                  such combination or the use thereof. Buyer shall indemnify and
                  hold Nortel harmless against any loss, cost, expense, damage,
                  settlement or other liability, including, but not limited to,
                  attorneys' fees, which may be incurred by Nortel with respect
                  to any suit, claim, or proceeding described in this Section
                  10.6.

         10.7     Notwithstanding the above, Nortel shall have no obligation or
                  liability with regard to any patent infringement suit, claim,
                  or proceeding that may be made or brought against Buyer (i)
                  alleging that method of use claims in such patent are
                  infringed by any service offering and/or by any use by Buyer
                  of Products furnished hereunder to make such service offering
                  available or (ii) resulting in a settlement payment, or award
                  of damages, or accounting of profits, where such settlement,
                  award, or accounting is based on the revenues or profits
                  earned or other value obtained by Buyer from its use of such
                  Products and/or is based on the lost revenues or profits of
                  third parties arising from Buyer's use of such Products.

         10.8     If Nortel determines that any Products are or may become the
                  subject of a suit, claim, or proceeding as described in
                  Section 10.7, Nortel may provide Buyer with notice to that
                  effect. Nortel shall have no liability to Buyer pursuant to
                  Section 10.2,10.4, or 10.5 with respect to Buyer's use of such
                  Products which occurs subsequent to such notice. In addition
                  to its obligations pursuant to Section 10.3, if Buyer becomes
                  aware that any Products may become the subject of any such
                  suit, claim, or proceeding before receiving any such notice
                  from Nortel, Buyer shall provide Nortel with notice to that
                  effect.

                                       5
<PAGE>
 
         10.9     After receipt of notice from Nortel pursuant to Section 10.8,
                  Buyer shall have the option to return to Nortel the applicable
                  Products identified in such notice and Nortel shall refund the
                  depreciated value (as carried on the books of Buyer) of the
                  returned Products to Buyer as more fully set forth in Section
                  10.5.

         10.10    The provisions of Sections 10.2 through 10.9 state the entire
                  liability of Nortel and its suppliers and the exclusive remedy
                  of Buyer with respect to any suits, claims, or proceedings of
                  the nature described in Section 10.2.

         10.11    Each party's respective obligations pursuant to this Section
                  shall survive any termination of this Agreement.

11.      REMEDIES AND LIMITATION OF LIABILITY

         11.1     Nortel shall have the right to suspend its performance by
                  written notice to Buyer and forthwith remove and take
                  possession of all Products that shall have been delivered to
                  Buyer, if, prior to payment to Nortel of any amounts due
                  pursuant to this Agreement with respect to such Products,
                  Buyer shall (a) become insolvent or bankrupt or cease, be
                  unable, or admit in writing its inability, to pay all debts as
                  they mature, or make a general assignment for the benefit of,
                  or enter into any arrangement with, creditors, (b) authorize,
                  apply for, or consent to the appointment of, a receiver,
                  trustee, or liquidator of all or a substantial part of its
                  assets or have proceedings seeking such appointment commenced
                  against it which are not terminated within ninety (90) days of
                  such commencement, or (c) file a voluntary petition under any
                  bankruptcy or insolvency law or under the reorganization or
                  arrangement provisions of the United States Bankruptcy Code or
                  any similar law of any jurisdiction or have proceedings under
                  any such law instituted against it which are not terminated
                  within ninety (90) days of such commencement.

         11.2     In the event of any material breach of this Agreement which
                  shall continue for thirty (30) or more days after written
                  notice of such breach (including a reasonably detailed
                  statement of the nature of such breach) shall have been given
                  to the breaching party by the aggrieved party, the aggrieved
                  party shall be entitled at its option to avail itself of any
                  and all remedies available at law or equity, except as
                  otherwise provided in this Agreement.

         11.3     Nothing contained in Section 11.2 or elsewhere in this
                  Agreement shall make Nortel liable for any incidental,
                  indirect, consequential or special damages of any nature
                  whatsoever for any breach of this Agreement whether the claims
                  for such damages arise in tort, contract, or otherwise, or
                  shall increase the liability of Nortel under Section 9 or 10
                  or Exhibit D beyond that prescribed therein.

                                       6
<PAGE>
 
         11.4     Nortel shall not be liable for any additional costs, expenses,
                  losses or damages resulting from errors, acts or omissions of
                  Buyer, including, but not limited to, inaccuracy,
                  incompleteness or untimeliness in the provision of information
                  by Buyer to Nortel or fulfillment by Buyer of any of its
                  obligations under this Agreement.

         11.5     Any action for breach of this Agreement or to enforce any
                  right hereunder shall be commenced within two (2) years after
                  the cause of action accrues or it shall be deemed waived and
                  barred, except any action for nonpayment by Buyer of any
                  prices, charges, or fees payable hereunder may be brought by
                  Nortel at any time permitted by applicable law.

         11.6     The limitations on Nortel's liability and other obligations
                  set forth in Sections 9,10, and 11 shall survive any
                  termination of this Agreement.

12.      FORCE MAJEURE

         If the performance by a party of any of its obligations under this
         Agreement shall be interfered with by reason of any circumstances
         beyond the reasonable control of that party, including without
         limitation, unavailability of supplies or sources of energy, power
         failure, breakdown of machinery, or labor difficulties, including
         without limitation, strikes, slowdowns, picketing or boycotts, then
         that party shall be excused from such performance for a period equal to
         the delay resulting from the applicable circumstances and such
         additional period as may be reasonably necessary to allow that party to
         resume its performance. With respect to labor difficulties as described
         above, a party shall not be obligated to accede to any demands being
         made by employees or other personnel.

13.      CONFIDENTIAL INFORMATION

         13.1     Each party which receives the other party's Confidential
                  Information shall use reasonable care to hold such
                  Confidential Information in confidence and not disclose such
                  Confidential Information to anyone other than to its employees
                  and employees of its affiliates with a need to know. A party
                  that receives the other party's Confidential Information shall
                  not reproduce such Confidential Information, except to the
                  extent reasonably required for the performance of its
                  obligations pursuant to this Agreement and in connection with
                  any permitted use of such Confidential Information.

         13.2     Buyer shall take reasonable care to use Nortel's Confidential
                  Information only for study, operating, or maintenance purposes
                  in connection with Buyer's use of Products furnished by Nortel
                  pursuant to this Agreement.

         13.3     Nortel shall take reasonable care to use Buyer's Confidential
                  Information only to perform Nortel's obligations to provide
                  Products and/or Services to Buyer, provided

                                       7
<PAGE>
 
                  Nortel may use any of Buyer's Confidential Information for the
                  development, manufacture, marketing and maintenance of new
                  products and/or services and/or changes or modifications to
                  the existing Products and/or Services, which Nortel may, in
                  either case, provide to third parties without restriction.

         13.4     The obligations of either party pursuant to this Section 13
                  shall not extend to any Confidential Information which
                  recipient can demonstrate through written documentation was
                  already known to the recipient prior to its disclosure to the
                  recipient, was known or generally available to the public at
                  the time of disclosure to the recipient, becomes known or
                  generally available to the public (other than by act of the
                  recipient) subsequent to its disclosure to the recipient, is
                  disclosed or made available in writing to the recipient by a
                  third party having a bona fide right to do so, or is required
                  to be disclosed by process of law, provided that the recipient
                  shall notify the disclosing party promptly upon any request or
                  demand for such disclosure.

         13.5     The parties' obligations pursuant to this Section 13 shall
                  survive any termination of this Agreement.

14.      BUYER'S RESPONSIBILITIES

         14.1     All sites at which the Products shall be delivered or
                  installed shall be prepared by Buyer in accordance with
                  Nortel's standards, including, without limitation,
                  environmental requirements.

         14.2     Buyer shall provide Nortel-designated personnel access to the
                  Products during the times deemed necessary by Nortel to
                  install, maintain and service the Products in accordance with
                  Nortel's obligations. Nortel personnel shall comply with
                  Buyer's reasonable site and security regulations, provided
                  Nortel receives written notice of any such regulations
                  reasonably in advance of the arrival of Nortel's personnel at
                  the site.

         14.3     Buyer shall provide reasonable working space and facilities,
                  including heat, light, ventilation, telephones, electrical
                  current, trash removal and other necessary utilities for use
                  by Nortel-designated maintenance personnel, and adequate
                  secure storage space, if required by Nortel, for Products and
                  materials. Buyer shall also provide adequate security for the
                  Products while on Buyer's site.

         14.4     Buyer shall obtain all necessary governmental permits
                  applicable to Buyer in connection with the installation,
                  operation, and maintenance of Products furnished hereunder,
                  excluding any applicable permits required in the normal course
                  of Nortel's doing business.

                                       8
<PAGE>
 
         14.5     Any information which Nortel reasonably requests from Buyer
                  and which is necessary for Nortel to properly install or
                  maintain the Products shall be provided by Buyer to Nortel in
                  a timely fashion and in a form reasonably specified by Nortel.

15.      HAZARDOUS MATERIALS

         15.1     Prior to issuing any Order for Services to be performed at
                  Buyer's facilities, Buyer shall identify and notify Nortel in
                  writing of the existence of all Hazardous Materials which
                  Nortel may encounter during the performance of such Services,
                  including, without limitation, any Hazardous Materials
                  contained within any equipment to be removed by Nortel.

         15.2     If Buyer breaches its obligations pursuant to Section 15.1,
                  (a) Nortel may discontinue the performance of the appropriate
                  Services until all the applicable Hazardous Materials have
                  been removed or abated to Nortel's satisfaction by Buyer at
                  Buyer's sole expense, and (b) Buyer shall defend, indemnify
                  and hold Nortel harmless from any and all damages, claims,
                  losses, liabilities and expenses, including, without
                  limitation, attorneys' fees, which arise out of Buyer's breach
                  of such obligations. Buyer's obligations pursuant to this
                  Section 15.2 shall survive any termination of this Agreement.

16.      SUBCONTRACTING

         Nortel may subcontract any of its obligations under this Agreement, but
         no such subcontract shall relieve Nortel of primary responsibility for
         performance of its obligations.

17.      REGULATORY COMPLIANCE

         In the event of any change in the Specifications or Nortel's
         manufacturing or delivery processes for any Products as a result of the
         imposition of requirements by any government, Nortel may upon notice to
         Buyer, increase its prices, charges and fees to cover the added costs
         and expenses directly incurred by Nortel as a result of such change.

18.      GENERAL

         18.1     If any of the provisions of this Agreement shall be invalid or
                  unenforceable under applicable law and a party deems such
                  provisions to be material, that party may terminate this
                  Agreement upon notice to the other party. Otherwise, such
                  invalidity or unenforceability shall not invalidate or render
                  this Agreement unenforceable, but this Agreement shall be
                  construed as if not containing the particular invalid or
                  unenforceable provision and the rights and obligations of the
                  parties shall be construed and enforced accordingly.

                                       9
<PAGE>
 
     
         18.2     A party shall not release without the prior written approval
                  of the other party any advertising or other publicity relating
                  to this Agreement wherein such other party may reasonably be
                  identified. In addition each party shall take reasonable
                  precautions to keep the existence and the contents of this
                  Agreement confidential so long as this Agreement remains in
                  effect *________________________________.      

         18.3     The construction, interpretation and performance of this
                  Agreement shall be governed by the laws of the State of North
                  Carolina, except for its rules with respect to the conflict of
                  laws.

         18.4     Neither party may assign or transfer this Agreement or any of
                  its rights hereunder without the prior written consent of the
                  other party, such consent not to be unreasonably withheld,
                  except Buyer's consent shall not be required for any
                  assignment or transfer by Nortel (a) to any Affiliate of all
                  or any part of this Agreement or of Nortel's rights hereunder,
                  or (b) to any third party of Nortel's right to receive any
                  monies which may become due to Nortel pursuant to this
                  Agreement.

         18.5     Notices and other communications shall be transmitted in
                  writing by certified United States Mail, postage prepaid,
                  return receipt requested, by guaranteed overnight delivery, or
                  by facsimile addressed to the parties as follows:

                  To Buyer:     Focal Communications Corporation
                                300 W. Washington St. Suite 1408
                                Chicago, IL 60606
                                Attention: Executive Vice President
                                Facsimile: (312) 578-8403

                  To Nortel:    Northern Telecom Inc.
                                2221 Lakeside Blvd.
                                Richardson,TX 75083

                                Attention:  General Manager, Carrier
                                            Networks Facsimile: (972) 684-8845

                  In addition, notices submitted by Buyer to Nortel specific to
                  any Product Attachment shall be delivered to the address
                  stated in the applicable Product Attachment along with a copy
                  submitted to Nortel at the address stated above.

                  Any notice or communication sent under this Agreement shall be
                  deemed given upon receipt, as evidenced by the United States
                  Postal Service return receipt Mail if given by certified
                  United States Mail, on the following business day if sent by
                  guaranteed overnight delivery, or on the transmission date if
                  given by facsimile during the receiving party's normal
                  business hours.

                                       10
<PAGE>
 
                  The address information listed for a party in this Section or
                  any Product Attachment may be changed from time to time by
                  that party by giving notice to the other as provided above.

         18.6     In the event of a conflict between the provisions of this
                  Agreement which are not contained in a Product Attachment and
                  the provisions of a Product Attachment, the provisions of the
                  Product Attachment shall prevail with respect to the Product
                  Line and Services described in that Product Attachment.

         18.7     All headings used herein are for index and reference purposes
                  only, and shall not be given any substantive effect. This
                  Agreement has been created jointly by the parties, and no rule
                  of construction requiring interpretation against the drafter
                  of this Agreement shall apply in its interpretation.

         18.8     Buyer shall not export any technical data received from Nortel
                  pursuant to this Agreement, or release any such technical data
                  with the knowledge or intent that such technical data will be
                  exported or transmitted to any country or to foreign nationals
                  of any country, except in accordance with applicable U.S. law
                  concerning the exporting of such technical data. Buyer shall
                  obtain all authorizations from the U.S. government in
                  accordance with applicable law prior to exporting or
                  transmitting any such technical data as described above.

         18.9     Any changes to this Agreement may only be effected if agreed
                  upon in writing by duly authorized representatives of the
                  parties hereto. No agency, partnership, joint venture, or
                  other similar business relationship shall be or is created by
                  this Agreement.

                                       11
<PAGE>
 
         18.10    This Agreement, including all Product Attachments and Exhibits
                  constitutes the entire agreement of the parties with respect
                  to the subject matter hereof.

NORTHERN TELECOM INC.                         FOCAL COMMUNICATIONS
                                              CORPORATION


By:   /s/ Vickie Yohe                         By: /s/ John Barnicle
      --------------------------------           -------------------------------
            (Signature)                              (Signature)


Name:   Vickie Yohe                           Name: John Barnicle
      --------------------------------              ----------------------------
        (Print)                                         (Print)


Title:  V.P. and General Manager              Title: Executive Vice President
      --------------------------------              ----------------------------

Date:   January 21, 1997                      Date: January 17, 1997
      --------------------------------              ----------------------------

                                       12
<PAGE>
 
                                    EXHIBIT A

                                   DEFINITIONS

As used in the Agreement (as defined below), the following initially capitalized
terms shall have the following meanings:

"Affiliate" shall mean Nortel's parent corporation, Northern Telecom Limited and
any corporation controlled directly or indirectly by Northern Telecom Limited
through the ownership or control of shares or other securities in such
corporation.

"Agreement" shall mean the Agreement to which this Exhibit is attached, and all
Exhibits and Product Attachments.

"Confidential Information" shall mean all information, including, without
limitation, specifications, drawings, documentation, know-how and pricing
information, of every kind or description which may be disclosed by either party
or an Affiliate to the other party in connection with this Agreement, provided
the disclosing party shall clearly mark any such information which is disclosed
in writing as the confidential property of the disclosing party and the
disclosing party shall identify the confidential nature of any such information
which it orally discloses at the time of such disclosure and shall provide a
written summary of the orally disclosed information to the recipient within
fifteen (15) days of such disclosure.

"Equipment" shall mean the hardware listed or otherwise identified in, or
pursuant to, any Product Attachment.

"Exhibits" shall mean Exhibits A, B, C, and D attached hereto, and any
additional Exhibits which Nortel and Buyer subsequently agree in writing shall
be incorporated into, and made a part of the Agreement by reference.

"Hazardous Materials" shall mean any pollutants or dangerous, toxic or hazardous
substances (including, without limitation, asbestos) as defined in, or pursuant
to, the OSHA Hazard Communication Standard (29 CFR Part 1910, Subpart Z), the
Resource Conservation and Recovery Act of 1976 (42 USC Section 6901, et seq.),
the Toxic Substances Control Act (15 USC Section 2601, et seq.), the
Comprehensive Environmental Response Compensation and Liability Act (42 USC
Section 9601, et seq.), and any other federal, state or local environmental law,
ordinance, rule or regulation.

"Order" shall mean a written purchase order issued by Buyer to Nortel. Each
Order shall specify on the face of the Order the types and quantities of
Products and/or Services to be furnished by Nortel pursuant to the Order, the
applicable prices, charges and/or fees with respect to such Products and/or
Services, Buyer's facility to which the Products are to be delivered, the
delivery and/or completion schedule, and any other information which may be
required to be included in an Order in accordance with the provisions of this
Agreement.
<PAGE>
 
"Product Attachments" shall mean any Product Attachments which the parties agree
in writing shall be incorporated into, and made a part of, this Agreement.

"Product Attachment Term" shall mean the period specified in a Product
Attachment during which that Product Attachment shall be in effect.

"Product Line" shall mean the Products described in and which may be furnished
pursuant to a specific Product Attachment.

"Products" shall mean any Equipment and/or Software which may be provided under
this Agreement.

"Services" shall mean all services listed or otherwise identified in, or
pursuant to, any Product Attachment which may be purchased from or provided by
Nortel and which are associated with the Product Line described in that Product
Attachment.

"Software" shall mean (a) programs in machine-readable code or firmware which
(i) are owned by, or licensed to, Nortel or any of its Affiliates, (ii) reside
in Equipment memories, tapes, disks or other media, and (iii) provide basic
logic operating instructions and user-related application instructions, and (b)
documentation associated with any such programs which may be furnished by Nortel
to Buyer from time to time.

"Specifications" shall mean, with respect to any Product Line, the
specifications identified in the applicable Product Attachment, provided Nortel
shall have the right at its sole discretion to modify, change or amend such
specifications at any time.

"Third Party Software Vendor" shall mean any supplier of programs contained in
the Software which is not an Affiliate.

"Vendor Items" shall mean, with respect to a Product Line, those portions of the
Product which are identified in the applicable Product Attachment as Vendor
Items.

"Warranty Period" shall mean, with respect to a Product Line, the Warranty
Period specified in the applicable Product Attachment.

                                       2
<PAGE>
 
                                    EXHIBIT B

                                SOFTWARE LICENSE

1.       Buyer acknowledges that the Software may contain programs which have
         been supplied by, and are proprietary to, Third Party Software Vendors.
         In addition to the terms and conditions herein, Buyer shall abide by
         any additional terms and conditions provided by Nortel to Buyer with
         respect to any Software provided by any Third Party Software Vendor.

2.       Upon Buyer's payment to Nortel of the applicable fees with respect to
         any Software furnished to Buyer pursuant to this Agreement, Buyer shall
         be granted a personal, non-exclusive, paid-up license to use the
         version of the Software furnished to Buyer only in conjunction with
         Buyer's use of the Equipment with respect to which such Software was
         furnished for the life of that Equipment as it may be repaired or
         modified. Buyer shall be granted no title or ownership rights to the
         Software, which rights shall remain in Nortel or its suppliers.

3.       As a condition precedent to this license and to the supply of Software
         by Nortel pursuant to the Agreement, Nortel requires Buyer to give
         proper assurances to Nortel for the protection of the Software.
         Accordingly, all Software supplied by Nortel under or in implementation
         of the Agreement shall be treated by Buyer as the exclusive property,
         and as proprietary and a TRADE SECRET, of Nortel and/or its suppliers,
         as appropriate, and Buyer shall: a) hold the Software, including,
         without limitation, any methods or concepts utilized therein in
         confidence for the benefit of Nortel and/or its suppliers, as
         appropriate; b) not provide or make the Software available to any
         person except to its employees on a 'need to know' basis; c) not
         reproduce, copy, or modify the Software in whole or in part except as
         authorized by Nortel; d) not attempt to decompile, reverse engineer,
         disassemble, reverse translate, or in any other manner decode the
         Software; e) issue adequate instructions to all persons, and take all
         actions reasonably necessary to satisfy Buyer's obligations under this
         license; and f) forthwith return to Nortel, or with Nortel's consent
         destroy, any magnetic tape, disc, semiconductor device or other memory
         device or system and/or documentation or other material, including, but
         not limited to all printed material furnished by Nortel to Buyer which
         shall be replaced, modified or updated.

4.       The obligations of Buyer hereunder shall not extend to any information
         or data relating to the Software which is now available to the general
         public or becomes available by reason of acts or failures to act not
         attributable to Buyer.

5.       Buyer shall not assign this license or sublicense any rights herein
         granted to any other party without Nortel's prior written consent.

6.       Buyer shall indemnify and hold Nortel and its suppliers, as
         appropriate, harmless from any loss or damage resulting from a breach
         of this Exhibit B. The obligations of Buyer under this Exhibit B shall
         survive the termination of the Agreement and shall continue if the
         Software is removed from service.
<PAGE>
 
                                    EXHIBIT C

                                     STORAGE

If Buyer notifies Nortel prior to the scheduled shipment date of Products that
Buyer does not wish to receive such Products on the date agreed by the parties,
or the installation site or other delivery location is not prepared in
sufficient time for Nortel to make delivery in accordance with such date, or
Buyer fails to take delivery of any portion of such Products, Nortel may place
the applicable Products in storage. In that event Buyer shall be liable for all
additional costs thereby incurred by Nortel. Delivery by Nortel of any Products
to a storage location as provided above shall be deemed to constitute delivery
of the Products to Buyer for purposes of this Agreement, including, without
limitation, provisions for payment, invoicing, passage of risk of loss, and
commencement of the Warranty Period.
<PAGE>
 
                                    EXHIBIT D

                          LIMITED WARRANTS AND REMEDIES

1.       Nortel warrants that the Equipment supplied hereunder will under normal
         use and service be free from defective material and faulty workmanship
         and will conform to the applicable Specifications for the Warranty
         Period specified in the Product Attachment with respect to such
         Equipment. The foregoing warranty shall not apply to items normally
         consumed in operation, such as, but not limited to, lamps and fuses or
         to Vendor Items. Any installation Services performed by Nortel with
         respect to such Equipment shall be free from defects in workmanship for
         the Warranty Period set forth in the applicable Product Attachment.

2.       Nortel's sole obligation and Buyer's exclusive remedy under the
         warranty set forth in Section 1 above shall be limited to the
         replacement or repair, at Nortel's option and expense, of the defective
         Equipment, or correction of the defective installation Services.
         Replacement Equipment may be new or reconditioned at Nortel's option.

3.       Nortel warrants that any Software licensed by Nortel to Buyer under
         this Agreement shall function during the Warranty Period of the
         Equipment with respect to which such Software is furnished without any
         material, service affecting nonconformance to the applicable
         Specifications, provided that Buyer shall have paid all Software
         support fees specified in the applicable Product Attachment. If the
         Software fails to so function, Buyer's sole remedy and Nortel's sole
         obligation under this warranty is for Nortel to correct such failure
         through, at Nortel's option, the replacement or modification of the
         Software or such other actions as Nortel reasonably determines to be
         appropriate.

4.       Unless otherwise stated in a Product Attachment, (a) Nortel's
         warranties in Section 3 above shall only apply to the portion of the
         Software actually developed by Nortel or its Affiliates, (b) all other
         Software shall be provided by Nortel "AS IS", (c) Nortel shall assign
         to Buyer on a nonexclusive basis any warranty on such other Software
         provided to Nortel by the developer of such other Software to the
         extent of Nortel's legal right to do so.

5.       The obligations and remedies set forth in Sections 1, 2, and 3 above
         shall be conditional upon: the Equipment not having been altered or
         repaired, the Software not having been modified, and the Products not
         having been installed outside the United States; any defect or
         nonconformance not being the result of mishandling, abuse, misuse,
         improper storage, improper performance of installation, other services,
         maintenance or operation by other than Nortel (including use in
         conjunction with any product which is incompatible with the applicable
         Equipment or Software or of inferior performance), and/or any error,
         act, or omission of Buyer described in Section 11.4; the Product not
         having been damaged by fire, explosion, power failure, power surge, or
         other power irregularity, lightning, failure to comply with all
         applicable environmental requirements for the Products specified by
         Nortel or any other applicable supplier, such as but not limited to
         temperature or humidity ranges,
<PAGE>
 
         or any act of God, nature or public enemy; and written notice of the
         defect having been given to Nortel within the applicable Warranty
         Period.

6.       The performance by Nortel of any of its obligations described in
         Section 2 or 3 of this Exhibit D shall not extend the applicable
         Warranty Period except to the extent specified in the applicable
         Product Attachment.

7.       Upon expiration of the applicable Warranty Period for Equipment
         furnished hereunder, repair and replacement Service for such Equipment
         shall be available to Buyer from Nortel in accordance with Nortel's
         then-current terms, conditions and prices. Such repair and replacement
         Service and notice of any discontinuance of such repair and replacement
         Service shall be available for a minimum period set forth in the
         Product Attachment applicable to such Equipment. This provision shall
         survive the expiration of this Agreement.

8.       Unless Nortel elects to repair or replace defective Equipment at
         Buyer's facility, all Equipment to be repaired or replaced, whether in
         or out of warranty, shall be packed by Buyer in accordance with
         Nortel's instructions stated in the applicable Product Attachment and
         shipped at Buyer's expense and risk of loss to a location designated by
         Nortel. Replacement Equipment shall be returned to Buyer at Nortel's
         expense and risk of loss. Buyer shall ship the defective Equipment to
         Nortel within thirty (30) days of receipt of the replacement Equipment.
         In the event Nortel fails to receive such defective Equipment within
         such thirty (30) day period, Nortel shall invoice Buyer for the
         replacement Equipment at the then current price in effect therefor.

9.       With respect to any Vendor Item furnished by Nortel to Buyer pursuant
         to this Agreement, Nortel shall assign to Buyer on a nonexclusive basis
         any warranty granted by the party that supplied such Vendor Item to
         Nortel to the extent of Nortel's right to do so.

10.      Neither Nortel nor Nortel's suppliers, as appropriate, shall have any
         responsibility for warranties offered by Buyer to any of its customers.
         Buyer shall indemnify Nortel and Nortel's suppliers, as appropriate,
         with respect thereto.

                                       2
<PAGE>
 
                               PRODUCT ATTACHMENT
                            CARRIER NETWORKS PRODUCTS

Northern Telecom Inc. ("Nortel") and Focal Communications Corporation ("Buyer")
agree as follows:

1.       INCORPORATION BY REFERENCE

         This Product Attachment shall be incorporated into and made a part of
         Network Products Purchase Agreement No. JRD0197FCC between Nortel and
         Buyer.

2.       DEFINITIONS

         For purposes of this Product Attachment:

         "Acceptance Criteria" shall mean, with respect to any Products
         installed by Nortel hereunder, the standards and specifications
         contained in the Nortel Installation Manuals which are applicable to
         such Products.

         "Equipment" shall mean the equipment listed in Schedule A.

         "Extension" shall mean Equipment and/or Software which Nortel engineers
         and installs and which is added to an Initial System after the Turnover
         Date of the Initial System.

         "Initial System" shall mean the Equipment and Software which is
         included in any configuration identified in Schedule A as an "Initial
         System."

         "Installation Site" shall mean Buyer's facility identified in an Order
         to which the applicable Products identified in such Order shall be
         delivered or at which the applicable Services, if any, are to be
         performed, respectively.

         "Merchandise" shall mean any Equipment which is not part of a System
         and with respect to which no engineering or installation Services shall
         be provided by Nortel.

         "Product Attachment Term" shall mean the period which shall commence on
         the date this Product Attachment is executed by the latter of the
         parties and shall expire thirty six (36) months thereafter.

         "Services" shall mean the services described in Schedule B.

         "Software" shall mean the software listed in Schedule A.
<PAGE>
 
         "Specifications" shall mean with respect to any Products furnished
         hereunder, the specifications published by Nortel which Nortel
         identifies as its standard performance specifications for such Products
         as of the date of Buyer's Order for such Products.

         "System" shall mean any Initial System or Extension.

         "Turnover Date" shall mean, with respect to any Products installed by
         Nortel hereunder, the date on which Nortel provides the Turnover Notice
         to Buyer pursuant to Section 8.a. of this Product Attachment.

         "Warranty Period" shall mean, with respect to:

         (a)      Any System, the period which shall commence upon the Turnover
                  Date with respect to such System and shall expire twelve (12)
                  months thereafter,

         (b)      Merchandise, the period which shall commence upon the date of
                  shipment with respect to such Merchandise by Nortel to Buyer
                  and shall expire ninety (90) days thereafter,

         (c)      Installation Services involving any System, the period which
                  shall commence upon the Turnover Date with respect to such
                  System and shall expire twelve (12) months thereafter,

         (d)      Equipment which is repaired or replaced pursuant to Nortel's
                  obligations under Exhibit D to the Agreement, the period
                  commencing five (5) days after (i) shipment of the replacement
                  Equipment to Buyer or (ii) completion of the repair at the
                  Installation Site of the applicable Equipment and which shall
                  expire on the later of ninety (90) days thereafter or the last
                  day of the original Warranty Period with respect to the
                  Equipment which was repaired or replaced, and

         (e)      Software which was corrected pursuant to Nortel's obligations
                  under Exhibit D to the Agreement, the period commencing upon
                  delivery of the corrected Software by Nortel to Buyer and
                  expiring on the later of ninety (90) days thereafter or the
                  last day of the original Warranty Period with respect to such
                  Software.

3.       SCOPE
    
a.       Buyer shall during the Product Attachment Term issue Orders for a
         minimum of *_______ DMS-500 Initial Systems as described in Schedule A
         for delivery and installation in Buyer's facilities designated by
         Buyer. Buyer may during the Product Attachment Term issue Orders for
         additional DMS-500 Initial Systems and Extensions as described in
         Schedule A for delivery and installation in Buyer's facilities. Buyer
         shall pay the prices, fees and charges set forth in Schedule A for the
         Initial Systems and the Extensions in accordance with Section 7 of this
         Product Attachment.      

                                       2
<PAGE>
 
    
b.       During the Product Attachment Term Buyer shall purchase from Nortel
         *_____________ "Class 4" and "Class 5" switches (as those terms are 
         used in the telecommunications industry), except that Buyer shall be
         relieved of its obligation to purchase *______________ "Class 4" and
         "Class 5" switches in the event the Buyer acquires a company through
         a merger or acquisition and which, at the time of the merger or 
         acquisition, operates for "Class 4" and "Class 5" switches not 
         manufactured by Nortel.      
    
c.       In the event Nortel fails, through no fault other than its own, to
         effect turnover of an Initial System within *___________________
         following the date that Buyer approves in writing the floor plans
         prepared by Nortel for installation of the applicable Initial System,
         or the date that Buyer agrees in writing to the final hardware
         configuration for the applicable Initial systems (that date being the
         same date on which Buyer signs the completed Customer Information
         ("CI")), whichever occurs later, then Nortel shall pay Buyer, as
         liquidated damages and not as a penalty, and as Buyer's sole and
         exclusive remedy, the amount of *________________ per day for each day
         that Turnover is delayed beyond such *_________________ day. In no
         event shall Nortel's liability under this clause exceed *__________ for
         each Initial System ordered by Buyer pursuant to Section 3a above. 
     

4.       SCHEDULES

         The following Schedules which are attached hereto are an integral part
         of the Product Attachment and are incorporated herein by reference:

                  Schedule A  - Products, Prices, and Fees
                  Schedule B  - Services and Charges
                  Schedule C  - Delivery
                  Schedule D  - Documentation

5.       ORDERING

         With respect to Section 3, ORDERING of the Agreement the following
         additional terms shall apply:

a.       Buyer shall identify in each Order for Products whether the Products
         constitute an Initial System, Extension, or Merchandise. All Orders for
         Merchandise and/or any Services other than engineering and installation
         Services provided by Nortel in connection with an Order for an Initial
         System and/or an Extension shall be subject to written agreement of
         Buyer and Nortel on the applicable prices, charges and fees with
         respect thereto as required pursuant to Section 6, PRICING, of this
         Product Attachment.
    
b.       Notwithstanding Exhibit C to the Agreement, Buyer may by written notice
         to Nortel cancel without charge any Order for Products and/or Services
         prior to the delivery date of the applicable Products set forth in such
         Order or the agreed date for the commencement by Nortel of the
         applicable Services ("Service Commencement Date"), except that if Buyer
         cancels such Order within six (6) weeks or less of any such date, a
         cancellation fee of *___________ of the aggregate price of all Products
         and/or Services included in such cancelled Order shall be payable by
         Buyer. Nortel may invoice such amount upon receipt of Buyer's notice of
         cancellation of the Order.      

c.       Notwithstanding Exhibit C to the Agreement, Buyer may by written notice
         to Nortel not less than six (6) weeks prior to the delivery date of any
         Products set forth in an Order and/or the Service Commencement Date of
         the applicable Services, delay the delivery date of such Products
         and/or the Service Commencement Date of such Services for a period
         which shall not exceed ninety (90) days from the date such Products
         were originally scheduled to be delivered or ninety (90) days from the
         Service Commencement Date, subject to the availability from Nortel of
         the applicable Products and/or Services after such period of delay.

                                       3
<PAGE>
 
d.       Except as set forth in Sections 5.b. and 5.c. of this Product
         Attachment, any change to an Order after Nortel's acceptance of such
         Order shall require written agreement of Nortel and Buyer upon a
         written change to the Order ("Change Order") which shall reference the
         original Order and be executed by the parties. No such changes shall be
         implemented until the applicable Change Order has been executed by the
         parties.
    
e.       With respect to each Order for Products which is accepted by Nortel,
         Buyer may make a written request at least ninety (90) days prior to the
         scheduled shipment date of such Products for a change ("Change")
         consisting of certain addition(s) or deletion(s) to such Products.
         After receipt of such request, Nortel shall submit a Job Change Order
         ("JCO") to Buyer for Buyer's approval with respect to the requested
         Change. Each JCO shall state whether the requested Change shall
         increase or decrease the Price and/or time required by Nortel for any
         aspect of its performance under the Agreement with respect to such
         Order. Buyer shall accept or reject the JCO in writing within ten (10)
         days of receipt thereof. Failure of the Buyer to accept or reject the
         JCO in writing as described above shall be deemed a rejection of the
         JCO by Buyer. In the event an accepted JCO involves the return to
         Nortel of any Equipment which shall have been previously delivered to
         Buyer, Nortel may invoice and Buyer shall pay the transportation costs
         and Nortel's then-current restocking charge for the returned Equipment,
         such restocking charge shall not exceed *____________ of the list price
         for the returned Equipment.      

f.       Any increase or decrease in the Price with respect to an Order
         hereunder which is occasioned by an accepted JCO shall be added to or
         subtracted from, as applicable, the amount of the last payment due
         pursuant to Section 6 with respect to such Order.

g.       If Buyer rejects a proposed JCO, then the rights and obligations of the
         parties with respect to the applicable Order shall not be subject to
         Buyer's requested Changes. Nortel shall be entitled to an extension of
         the dates for performance of its obligations with respect to the
         applicable Order as a result of any delays in such performance which
         result from the foregoing.

6.       PRICING

         With respect to Section 4, PRICES of the Agreement, the following
         additional terms shall apply:

a.       The prices set forth in Schedule A with respect to any Initial System
         and/or Extension shall be in effect for the Product Attachment Term.
         The prices listed in Schedule A shall apply to any Order for an Initial
         System and/or an Extension listed in Schedule A which shall be received
         by Nortel during the Product Attachment Term, provided that the
         delivery date for such Initial System and/or Extension as set forth in
         the applicable Order shall be not more than one hundred twenty (120)
         days after Nortel's acceptance of such Orders.

                                       4
<PAGE>
 
b.       The prices for Equipment, the fees for the right to use the Software,
         prices for any Merchandise, and charges for any Services, other than
         engineering and installation Services provided with any Initial System
         and/or an Extension shall be as subsequently agreed in writing by
         Nortel and Buyer.

c.       Shipment of the Product shall be F. O. B. the Installation Site

7.       TERMS OF PAYMENT

         With respect to Section 5, TERMS OF PAYMENT, the following additional
         terms shall apply:

a.       With respect to each Initial System and/or Extension furnished
         hereunder by Nortel to Buyer the price listed in Schedule A shall be
         invoiced by Nortel in accordance with the following schedule:

         (i)      Twenty percent (20%) of such price may be invoiced upon
                  Nortel's acceptance of the Order for such Initial System
                  and/or Extension,

         (ii)     Fifty percent (50%) of such price may be invoiced on the date
                  of shipment by Nortel to Buyer of the switch component of such
                  Initial System and/or the Equipment of such Extension,

         (iii)    Twenty percent (20%) of such price may be invoiced on the
                  Turnover Date of such Initial System and/or Extension, and

         (iv)     Ten percent (10%) of such price may be invoiced on the date of
                  Acceptance of such Initial System and/or Extension.

b.       Except as may be otherwise agreed in writing by the parties Nortel's
         prices for Merchandise and charges for any Services determined in
         accordance with Section 6.b. above may be respectively invoiced upon
         delivery of such Merchandise and upon performance of such Services by
         Nortel.

8.       TESTING, TURNOVER, AND ACCEPTANCE

         Pursuant to Section 8.1 of the Agreement, the rights and obligations of
         the parties with respect to testing, turnover and acceptance of any
         Products furnished hereunder and installed by Nortel shall be as
         follows:

a.       Nortel shall provide Buyer with five (5) days written notice prior to
         commencing final commissioning and testing of any Products installed by
         Nortel. Buyer shall cause an authorized representative of Buyer to be
         present at the applicable Installation Site to witness such final
         commissioning and testing, provided that in the event such
         representative fails to

                                       5
<PAGE>
 
         be present for any reason, Nortel shall not be required to delay
         performance of such final commissioning and testing. In connection with
         the final commissioning and testing of such Products, Nortel shall test
         the Products for conformity with the applicable Acceptance Criteria.
         When such tests have been successfully completed, Nortel shall provide
         Buyer with written notice ("Turnover Notice") that the applicable
         Products meet such Acceptance Criteria and are ready for Buyer's
         testing for compliance with such Acceptance Criteria. Buyer shall
         promptly complete and return to Nortel Buyer's acknowledgment of
         receipt of such Turnover Notice.


b.       Following the Turnover Date, Buyer may test the applicable Products for
         compliance with the Acceptance Criteria using the tests and test
         procedures contained in Nortel's Installation Manuals with respect to
         such Products. Within thirty (30) days following the Turnover Date of
         the applicable Products, Buyer shall notify Nortel either that Buyer
         has accepted such Products in writing using Nortel's standard
         Acceptance Notice form or that Buyer has not accepted such Products in
         which case Buyer shall also provide Nortel with a written notice
         ("Notice of Deficiency") which shall provide in reasonable detail the
         manner in which Buyer asserts that the Products failed to meet the
         Acceptance Criteria. With respect to any such details with which Nortel
         agrees, Nortel shall promptly proceed to take appropriate corrective
         action and following correction, Buyer may retest the Products in
         accordance with this Section. Buyer shall accept the Products in
         writing without delay when the tests pursuant to this Section indicate
         that the Products comply with the Acceptance Criteria.

c.       With respect to any points of disagreement between Nortel and Buyer
         concerning any Notice of Deficiency which are not resolved by Nortel
         and Buyer within twenty (20) days after the effective date of the
         Notice of Deficiency, Buyer, at its option, may waive any rights it may
         have on account of any such points of disagreement, or require that the
         disputed points be resolved by arbitration.

d.       Buyer shall notify Nortel in writing of its election pursuant to
         Section 8.c. not later than twenty (20) days after the effective date
         of the Notice of Deficiency, if any, given to Nortel by Buyer. Such
         twenty (20) day period may be extended by mutual agreement in writing
         signed by the parties. Upon expiration of such twenty (20) day period,
         or any extension mutually agreed to by the parties, unless Buyer has
         notified Nortel to the contrary, Buyer shall be deemed to have elected
         to waive its right with respect to any points of disagreement then
         existing between it and Nortel with respect to such Notice of
         Deficiency.

e.       If Buyer makes timely election to require arbitration of such disputed
         points, the arbitrator shall be chosen by mutual agreement. If the
         parties cannot agree upon an arbitrator within three (3) days of
         Buyer's election to arbitrate, each party shall within three (3) days
         thereafter select an independent and an unaffiliated person to be an
         arbitrator. These two (2) persons selected shall select a third person,
         independent and unaffiliated with either party, as a third arbitrator.
         The arbitration shall be conducted in accordance with the Rules of the
         American Arbitration Association, provided, however that the
         Arbitrator(s) shall be empowered to

                                       6
<PAGE>
 
         reduce the Prices of Products only to the extent that the Arbitrator(s)
         find that the benefit of Buyer's bargain has been reduced. The
         Arbitrator(s) shall not have any authority to grant partial or total
         rescission unless the Arbitrator(s) determine that (i) Buyer has not
         substantially received the benefit of its bargain; and (ii) money
         damages will not provide an adequate remedy. Judgment upon the award
         rendered by the Arbitrator(s) may be entered in any Court of competent
         jurisdiction.

f.       For purposes of this Product Attachment, "Acceptance" of the applicable
         Products shall occur upon the earliest of the following and Buyer shall
         upon request sign Nortel's Acceptance Notice confirming such
         Acceptance:

         (i)      The date on which Buyer accepts such Products pursuant to
                  Section 8.b. of this Product Attachment;

         (ii)     The failure of Buyer to provide Nortel with any notice
                  required by Section 8.b. of this Product Attachment, with
                  respect to such Products;

         (iii)    Use by Buyer of such Products or any portion thereof in
                  revenue producing service at any time; or

         (iv)     Waiver by Buyer of its rights pursuant to Section 8.c. or 8.d.

g.       Acceptance by Buyer of such Products pursuant to Section 8.f. of this
         Product Attachment above shall not be withheld or postponed due to:

         (i)      Deficiencies of such Products resulting from causes not
                  attributable to Nortel, such as, but not limited to (A)
                  inaccuracy of information provided by Buyer, (B) inadequacy or
                  deficiencies of any materials, facilities or services provided
                  directly or indirectly by Buyer and tested in conjunction with
                  the applicable Products, or (C) spurious outputs from adjacent
                  material; or

         (ii)     Minor deficiencies or shortages with respect to such Products
                  which are attributable to Nortel, but of a nature that do not
                  prevent full and efficient operation of the Products.

h.       With respect to any deficiencies of the type described in Section
         8.g.(i), Nortel shall at Buyer's request and expense assist Buyer in
         the elimination or minimization of any such deficiencies. With respect
         to any deficiencies or shortages as described in the Section 8.g.(ii),
         Nortel shall, at Nortel's expense, take prompt and effective action to
         correct any such deficiencies or shortages.

i.       In the event Buyer's Acceptance of any Products is withheld or
         postponed due to any deficiencies of the type described in Section
         8.g.(i), Nortel shall invoice and Buyer shall pay

                                       7
<PAGE>
 
         Nortel's charges and reasonable expenses incurred by Nortel associated
         with Nortel's investigation of the reasons for Buyer's withholding or
         postponement of such Acceptance.

9.       WARRANTIES AND REMEDIES

         With respect to Exhibit D, LIMITED WARRANTIES AND REMEDIES, the
         following additional terms shall apply:

a.       Except as set forth in Section 9.b. below, Nortel shall in performance
         of its obligations under Section 2 of Exhibit D to the Agreement, (i)
         ship replacement Equipment or complete the repair within fifteen (15)
         days of Nortel's receipt of the Equipment to be replaced or repaired,
         and (ii) commence the correction of the applicable installation
         Services within fifteen (15) days of receipt of notice from Buyer
         pursuant to Section 5 of Exhibit D to the Agreement.
    
b.       For emergency warranty service situations involving the Equipment,
         Nortel shall during the applicable Warranty Period use all reasonable
         efforts to ship replacement Equipment within twenty-four (24) hours of
         notification of the applicable warranty defect by Buyer pursuant to
         Section 5 of Exhibit D to the Agreement, provided that Buyer shall have
         requested such emergency service. Nortel may invoice Buyer and Buyer
         shall pay Nortel's surcharge for emergency warranty services, such
         surcharge shall not exceed *____________________. If Nortel determines
         that due to the particular circumstances, onsite technical assistance
         is necessary, Nortel shall use all reasonable efforts to dispatch
         emergency service personnel to the applicable Installation Site within
         twenty-four (24) hours of receipt of notice from Buyer as described
         above.      

c.       All Products to be repaired or replaced, both within and outside of the
         applicable Warranty Period, shall be packed by Buyer in accordance with
         Nortel's then current instructions.

d.       No later than ninety (90) days prior to the expiration of the Warranty
         Period with respect to any Initial System, Nortel shall offer to Buyer
         post-warranty support by means of an extended service plan or other
         terms, provided that neither party shall have any obligation with
         respect thereto except as may be agreed upon in writing by the parties.
         Should Nortel fail to provide such notice of offering a post-warranty
         support, Buyer shall have sixty (60) days after expiration of the
         Warranty Period, in which to purchase such post-warranty support.

10.      NOTICES

         Pursuant to Section 18.5 of the Agreement, any notices by Buyer to
         Nortel which are specific to this Product Attachment shall be delivered
         to the following address:

                                       8
<PAGE>
 
                           Northern Telecom Inc.
                           2350 Lakeside Blvd.
                           Richardson, Texas 75082-4399
                           Attn: Vice President, Carrier Networks


11.      ADDITIONAL TERMS

         The following additional terms shall apply to the Agreement:

a.       With respect to Section 14, BUYER'S RESPONSIBILITIES, the following
         additional terms shall apply:

         (i)      Buyer shall be responsible for ordering and coordinating with
                  each applicable local telephone company the installation of
                  all central office trunks and test trunks and Buyer shall be
                  responsible for all utility charges associated with the
                  installation, testing, operation and maintenance of Products
                  furnished hereunder, including, but not limited to, all
                  applicable charges for such central office trunks, test trunks
                  and any tie lines.

b.       Nortel shall provide documentation with respect to the Products in
         accordance with Schedule D to this Product Attachment.
    
c.       In consideration of Buyer's commitment under Section 3, Nortel hereby
         grants Buyer *___________ worth of credits (each, a "Credit"). Each
         Credit shall have a value of One Dollar ($1.00). Buyer may use the
         credits any time during the Product Attachment Term. *________________
         of the *________________ worth of credits may be used for the purchase
         of ClusterVision services, a module of the LaserGuided Marketing
         services, as those services are described and priced in Nortel
         publication number 5004.15/09-96 titled "LaserGuided Marketing
         ClusterVision Price List". The remaining *_______________ of the
         *______________ worth of credits may be used during the Product
         Attachment Term to purchase Total Network Solution services, as those
         services are generally described and priced in Nortel's proposal dated
         January 13, 1997, which proposal shall be subject to revision. The
         purchase of those services shall be covered by a separate agreement,
         the terms and conditions of which shall be mutually agreed upon. The
         Credits may not be redeemed for cash or used for the purchase of any
         other products or services, and Buyer shall not be entitled to any
         refund for any Credits not used prior to the expiration of the Product
         Attachment Term.      

d.       In the event Nortel decides to discontinue the manufacture of any
         Schedule A Products during the period of seven (7) years following the
         Turnover Date of each Initial System Ordered under this Product
         Attachment, then Nortel shall give Buyer written notice of such intent
         at least twelve (12) months prior to the date of such discontinuance.
         Buyer may, during

                                       9
<PAGE>
 
         the twelve month period following noticaftion, order and Nortel shall
         deliver as much of such Schedule A Products as Buyer needs at the then
         current prices and/or license fees. Nothing herein shall be construed
         to require Nortel to continue to manufacture any Schedule A Products.


NORTHERN TELECOM INC.                         FOCAL COMMUNICATIONS
                                              CORPORATION


By:   /s/ Vickie Yohe                         By: /s/ John Barnicle
      --------------------------------           -------------------------------
            (Signature)                              (Signature)


Name:   Vickie Yohe                           Name: John Barnicle
      --------------------------------              ----------------------------
        (Print)                                         (Print)


Title:  V.P. and General Manager              Title: Executive Vice President
      --------------------------------              ----------------------------

Date:   January 21, 1997                      Date: January 17, 1997
      --------------------------------              ----------------------------

                                       10
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 1


                               PRODUCT ATTACHMENT
                            S/DMS ACCESSNODE PRODUCTS

Northern Telecom Inc. ("Nortel") and Focal Communications Corporation ("Buyer")
agree as follows:

NOW, THEREFORE Buyer and Nortel agree as follows:

1.           INCORPORATION BY REFERENCE

             This Product Attachment shall be incorporated into and made a part
             of Network Products Purchase Agreement No. JRD0197FCC between
             Nortel and Buyer.

2.           DEFINITIONS

             For purposes of this Product Attachment:

             "Equipment" shall mean the equipment listed in Schedule A.
    
             "Product Attachment Term" shall mean the period which shall
             commence on the date this Product Attachment is executed by the
             latter of the parties and shall expire December 31, 2000.      

             "Services" shall mean the services described in Schedule B.

             "Software" shall mean the software listed in Schedule A.

             "Specifications" shall mean Nortel's standard published
             performance specifications for the Products.
    
             "Warranty Period" shall mean *_______ months from the date of
             shipment stamped on the Equipment or, if the date of shipment is
             not marked on the Equipment, *______ months from the date of
             manufacture. In the event Nortel performs installation Services,
             the Equipment warranty shall be *______ months from the date of
             acceptance as set forth in Section 7 herein.      

3.           SCHEDULES

             The following Schedules which are attached hereto are an integral
             part of the Product Attachment and are incorporated herein by
             reference:

                         Schedule A - Products, Prices, and Fees
                         Schedule B - Services and Charges
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 2


                         Schedule C - Delivery Intervals
                         Schedule D - Forecast

4.           ORDERING

             4.1         All Orders shall specify the Products required and the
                         Services, Nortel is to perform, if any.

             4.2         Any change to the original Order initiated by Buyer
                         after Nortel's acceptance of the Order and any
                         resulting adjustments to prices, schedule and/or other
                         requirements of the Order shall be negotiated, mutually
                         agreed upon and subsequently detailed in a written
                         change to the Order ("Change Order"), referencing the
                         original Order and executed by authorized
                         representatives of Buyer and Nortel. The adjustment of
                         the Order prices for Products and charges for any
                         Services, as applicable, in a Change Order shall be
                         established on the basis of Nortel's then current
                         merchandise prices for such Products and/or charges for
                         Services. In the event that the Change Order affects
                         work already performed, the adjustment of the Order
                         price shall include reasonable charges incurred by
                         Nortel related to such work. No such changes shall be
                         performed until a Change Order has been executed by
                         Nortel and Buyer as described above.

5.           PRICING

             5.1         During the Product Attachment Term, Pricing for
                         Equipment and Software shall be as set forth in
                         Schedule A.

             5.2         The prices for engineering, installation and/or system
                         line-up and testing ("SLAT") Services performed by
                         Nortel with respect to an accepted Order shall be as
                         quoted by Nortel and agreed to by Buyer prior to
                         issuance of the applicable Order.

             5.3         Nortel will prepay freight charges and the cost of any
                         insurance requested by Buyer and invoice Buyer for
                         these items at Nortel's actual cost. These charges will
                         appear as separate line items on Nortel's invoice.

6.           TERMS OF PAYMENT

             Nortel shall invoice Buyer for the price of the Products as well as
             any prepaid freight and insurance charges upon shipment of the
             Products. Any Services provided hereunder shall be invoiced to
             Buyer upon Nortel's completion of such Services.

7.           TESTING, TURNOVER AND ACCEPTANCE
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 3



             7.1         When Nortel installs the Products, Buyer's acceptance
                         of the Products and Services shall take place, or be
                         deemed to have taken place, upon completion by Nortel
                         of installation and SLAT Services in accordance with
                         Nortel's standard procedures and practices, as
                         evidenced by the acceptance test results showing that
                         the Products meet and perform in accordance with the
                         applicable Specifications. Upon such acceptance, Nortel
                         shall provide Buyer with a turnover notice to be
                         acknowledged in writing by Buyer. By providing the
                         turnover notice, Nortel certifies that the Products
                         meet and perform in accordance with the applicable
                         Specifications. Acceptance of the Products shall not be
                         withheld or postponed due to:

                    a)   deficiencies of the Products or any other product with
                         which such Products are used or operated, resulting
                         from causes not attributable to Nortel, such as but not
                         limited to (i) inaccuracy of information provided by
                         Buyer, (ii) inadequacy or deficiencies of product,
                         facilities or services provided by Buyer or a third
                         party and tested in conjunction with the Products, or
                         (iii) other conditions, external to the Products
                         provided by Nortel, which are beyond limits specified
                         herein and are used by Nortel in performance
                         calculations and spurious outputs from adjacent
                         product. Nortel shall, however, at Buyer's expense,
                         assist Buyer in the elimination or minimization of such
                         deficiencies; or

                    b)   minor deficiencies or shortages, attributable to
                         Nortel, of a nature that do not prevent full and
                         efficient commercial operation of the Products. Nortel
                         shall, however, at its expense, take prompt and
                         effective action to correct any such deficiencies or
                         shortages.

             7.2         The effort associated with Nortel's investigation of
                         any deficiencies not attributable to Nortel shall be
                         billed to Buyer.

8.           WARRANTIES AND REMEDIES
    
             8.1         The repair or replacement of Equipment and the
                         correction of defective installation Services shall be
                         warranted for a period of *___ days or the remainder of
                         the original Warranty Period whichever is longer.      

             8.2         Nortel shall provide Buyer with repair and replacement
                         service for a minimum period of seven (7) years from
                         the commencement date of this Product Attachment,
                         subject to the condition that should Nortel discontinue
                         manufacture or repair of the Product or portions
                         thereof prior to the expiration of such seven (7) year 
                         period (such right of discontinuance being expressly
                         reserved by Nortel), Nortel shall provide Buyer with a
                         twelve (12) month prior written notice of any
                         discontinuance so as to enable Buyer to
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 4


                         place an order for its requirements or to enter into
                         any other mutually satisfactory agreement with Nortel
                         prior to such discontinuance. This provision shall
                         survive the expiration of this Product Attachment.

9.           NOTICES

             Pursuant to Section 18.5 of the Agreement, any notices by Buyer to
             Nortel which are specific to this Product Attachment shall be
             delivered to the following address:

                         Northern Telecom Inc.
                         5555 Windward Parkway, Suite B
                         Alpharetta, Georgia 30201-3895
                         Attn: Vice President and General Manager, 
                           Access Networks

10.          ADDITIONAL TERMS

             10.1        Nortel may, from time to time, issue updates to the
                         Software and, upon Buyer's payment of applicable Right
                         to Use Fees or Software License Fees, if any, shall
                         license these updates to Buyer. Nortel shall classify
                         such updates as either: 1) Incremental Software
                         Upgrades ("ISUs"), designed to correct any
                         nonconformance to the applicable Software
                         specifications or 2) enhancements which will provide
                         additional features ("Enhancements"). Updates to
                         Software, classified as ISUs by Nortel, will be
                         provided at no cost to Buyer. Notwithstanding the
                         foregoing, ISUs and Enhancements shall not include the
                         cost of any associated hardware that may be required to
                         update such ISUs. Updates classified as Enhancements,
                         which will be used by Buyer in its operations shall be
                         made available to Buyer on a billable basis. In the
                         event Nortel determines that the update includes both
                         ISUs and Enhancements which will be used by Buyer in
                         its operations, such update shall be made available to
                         Buyer. If Buyer elects to receive the update, Nortel
                         shall invoice Buyer only for the amount determined by
                         Nortel to be attributed to the Enhancements contained
                         in such update.

             10.2        In order to allow Nortel to meet its delivery
                         requirements, Buyer shall issue a forecast showing the
                         specific types and quantities of Products to be
                         released and the dates such Products will be released
                         throughout the Product Attachment Term. Buyer shall
                         update such forecasts quarterly with each forecast
                         stating the specific types of Products and quantities
                         of Products to be released during the next quarter. The
                         initial forecast shall be as set forth in Schedule D.
                         In the event Buyer does not meet its obligation to
                         update its forecast quarterly, then Nortel shall not be
                         obligated to meet its forecasted delivery intervals as
                         stated in Schedule C.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 5


                         
                         Nortel's only obligation regarding such delivery
                         intervals shall be to meet delivery dates set forth in
                         an accepted Order. If Nortel, prior to acceptance of an
                         Order, advises Buyer that it cannot meet a delivery
                         date shown in an Order, both parties will negotiate a
                         revised date prior to acceptance of the Order by
                         Nortel. The installation and SLAT intervals applicable
                         to an Order will be quoted by Nortel and agreed to by
                         Buyer and Nortel prior to issuance of such Order.

             10.3        If Nortel is providing Buyer with installation
                         Services, Buyer shall be responsible for having all
                         installation sites ready on time and in accordance with
                         Nortel's requirements. Buyer shall be responsible for
                         any expense incurred by Nortel as a result of Buyer's
                         failure to meet the foregoing obligations.

         
    
11.          EXCLUSIVITY

             During the Product Attachment Term, Buyer shall purchase from
             Nortel *_________________ digital loop carriers ("DLCs") or
             *__________ of Products, whichever is less. Buyer shall be relieved
             of its obligation to purchase its requirements for DLCs from Nortel
             in the event Buyer acquires a company through a merger or
             acquisition and which, at the time of the merger or acquisition,
             operates DLCs not manufactured by Nortel.      

12.          HOST DIGITAL TERMINALS
    
             12.1        Buyer shall issue an Order for a voice module ("Voice
                         Module") and host digital terminal ("HDT") in
                         accordance with Section 4, ORDERING, and the pricing
                         set forth in Schedule A. *____________________ Each HDT
                         supports up to fourteen (14) Voice Modules in the AN14
                         Software release therefore, 70% full shall equal ten
                         (10) Voice Modules interfacing the HDT. For the AN16
                         Software release, the HDT supports up to twenty-eight
                         (28) Voice Modules therefore, 70% full shall equal
                         twenty (20) Voice Modules interfacing the HDT. The
                         most recently ordered HDT shall be seventy percent
                         (70%) of full capacity and HDTs previously ordered
                         shall be one hundred percent (100%) of full capacity
                         before additional HDTs may be ordered by Buyer.      
    
             12.2        One week after Buyer's acceptance of the HDT and
                         AccessNode Express as described in Section 7, TESTING,
                         TURNOVER, AND ACCEPTANCE, Nortel shall provide an
                         instructor for one (1) on-site training course for a
                         maximum of ten (10) people on AccessNode Express, at no
                         charge, for each new metropolitan area where a Nortel
                         switch with an AccessNode Express is deployed by Buyer.
                         Nortel shall be responsible for travel and living
                         expenses of the course instructor and Buyer shall be
                         responsible for travel and living expenses of course
                         attendees.      
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                          PAGE 6



NORTHERN TELECOM INC.                    FOCAL COMMUNICATIONS           
                                         CORPORATION                    
                                                                        
By:    /s/ Martin Rist                   By:    /s/ John R. Barnicle   
       ---------------------------              ----------------------------
       Signature                                Signature                
                                                                        
Name:  Martin Rist                       Name:  John R. Barnicle     
       ---------------------------              ----------------------------
       Print                                    Print             
                                                                        
Title: V.P. Marketing                    Title: E.V.P. - C.O.O.         
       ---------------------------              ---------------------------- 
                                                                        
Date:  February 20, 1998                 Date:  February 17, 1998        
       ---------------------------              ----------------------------
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                      SCHEDULE A
                                                                     PAGE 1 OF 1


                           PRODUCTS, PRICING AND FEES

           SECTION

             1           Pricing for Stock Models

             2           Merchandise List

    
                   * FIFTEEN PAGES REGARDING PRICING AND 
                   MERCHANDISE LISTINGS ARE SUBJECT TO 
                   FOCAL'S CONFIDENTIALITY REQUEST AND 
                   HAVE BEEN OMITTED FROM THIS FILING        
<PAGE>
 
                                                        AGREEMENT NO. JRD0971FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                      SCHEDULE B
                                                                     PAGE 1 OF 1

                              SERVICES AND CHARGES

          SECTION

             1           Repair/Replacement Procedures

             2           Equipment Support

             3           Training

             4           Service Charges
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 1 OF 7




                          REPAIR/REPLACEMENT PROCEDURES


1.           GENERAL

             Nortel's Replacement-Repair Service Center located in Nashville,
             Tennessee, handles all repairs for Broadband/AccessNode Equipment.
             Broadband/AccessNode Equipment processed through Nortel is
             typically handled on a "Replacement-Repair" basis.

2.           REPAIR SERVICES - EQUIPMENT

             2.1         Normal Replacement Intervals

                         Normally, Nortel will ship a replacement unit within
                         thirty (30) calendar days after receipt of a defective
                         unit.

             2.2         On-Site Repair

                         The nature of some Equipment may make it more feasible
                         to effect the repairs on the Buyer's premises. These
                         arrangements will be made through the Nortel's Global
                         Product Support ("GPS") group serving the Buyer's area.

             2.3         Emergency Replacement

                         Defective Equipment vital to the call processing
                         ability of a system qualifies for emergency service.
                         This service is not intended to take the place of
                         normal replacement service. Emergency replacement will
                         be provided under the following conditions:

                         a.          The last spare circuit pack has been used
                                     to replace a defective pack in a system and
                                     all similar packs in the system are
                                     carrying live traffic.

                         b.          Nortel's ETAS group advises that an
                                     emergency situation exists and certain
                                     Equipment is required to correct the
                                     situation.

                         Nortel provides emergency replacement Equipment (new,
                         repaired, or functionally equivalent) at the service
                         charges set forth in Section 4 of this Schedule within
                         twenty-four (24) hours of a verbal request from the
                         Buyer. This service is available twenty-four (24) hours
                         a day, including holidays. Upon receiving verbal 
                         request, a replacement unit will be shipped to the
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                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 2 OF 7


                         Buyer. Written confirmation of the verbal request must 
                         be forwarded to Nortel within three (3) working days
                         of the verbal request for replacement. To request
                         emergency replacement service, phone 1-800-251-1758,
                         option 8 or 1-800- 423-9658.

             2.4         Upgrade to a Later Vintage Level

                         If requested by the Buyer, an upgrade may be applied to
                         a Buyer's unit submitted to Nortel for repair, provided
                         that the Equipment is upgradeable to the requested
                         vintage. Typically, the Buyer will be billed at normal
                         repair prices for this service. The Buyer shall make
                         prior arrangements with the appropriate service center
                         to obtain this service.

             2.5         Vendor Products (OEM)

                         The repair of most OEM equipment can be coordinated
                         through the Replacement-Repair Service Center in
                         Nashville, Tennessee. Upon receipt from the Buyer of
                         defective OEM equipment, Nortel will arrange the repair
                         and return of these units by the OEM vendor.

3.           SOFTWARE SERVICE

             3.1         New Software Updates

                         New Software Updates will be introduced via Nortel's
                         established Product Change Notice (PCN) routine. At
                         least sixty (60) days prior to field introduction,
                         notification of these changes will be provided to Buyer
                         by Nortel in writing.

             3.2         Software Updates

                         Software updates can be performed in-service on the
                         system without site visits. The policy for
                         compatibility over time is that a single step
                         in-service update will be supported for a period of two
                         (2) years from the general availability date of the
                         product release. Upgrading a system to the most recent
                         update from a product release beyond the two (2) year
                         window may involve an intermediate step (i.e.,
                         upgrading the system to an intermediate update) and the
                         purchase by Buyer of additional Equipment.


             3.3         Software Update Fees

                         Updates which are classified as Enhancements by Nortel
                         will be made available to Buyer at a price determined
                         by Nortel at the time such Software
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 3 OF 7

                         Update is offered to Buyer. Updates which are
                         classified as ISUs by Nortel will be provided at no
                         cost to the Buyer. Notwithstanding the foregoing, ISUs
                         and Enhancements shall not include the cost of any
                         associated hardware that may be required.

4.           BUYER PROCEDURE FOR REPLACEMENT-REPAIR SERVICE

             Two types of Replacement-Repair services are offered to Buyer:

             a.          Direct mail-in Replacement-Repair

             b.          Advance Authorization Replacement-Repair

                         Buyer may have Replacement-Repair service
                         pre-authorized and initiated within Nortel by a
                         telephone call to Nortel's Replacement Repair Service
                         Center.

             The decision on which procedure to use is the Buyer's. (Emergency
             service is handled as Advance Authorization Replacement-Repair
             only). Regardless of the procedure selected, certain guidelines as
             prescribed below are to be followed.

             4.1         Direct Mail-In Procedure for Replacement-Repair

                         a. For each defective unit, failure tags
                            should be completed and attached to the
                            Equipment.

                         b. Two copies of Nortel's mail-in form, or an
                            equivalent form approved by Nortel, should
                            be completed and enclosed with each
                            shipment.

                         c. The following data must be provided on the mail-in
                            form:

                            o Buyer's shipping address and phone number to 
                              contact in case of a shipping discrepancy;

                            o Buyer's billing address, billing contact, and 
                              phone number;

                            o Buyer's Order number and authorization;

                            o Shipping instructions;

                            o Unit identification (Nortel Product Engineering 
                              Code);
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 4 OF 7



                            o Quantity of units;

                            o Date shipped.

                         d. Defective units are to be packaged for
                            shipment following the procedures outlined
                            in Section 4.3 and shipped to Nortel in
                            accordance with Section 4.4.

                         e. Defective units are to be shipped to:

                            Northern Telecom Nashville Service Center
                            917 Air Park Center Drive, Dock F
                            Nashville, Tennessee 37217
                            Attention: Repair and Return

                         Any discrepancy in the above procedure will be brought
                         to the attention of the Buyer upon Nortel's receipt of
                         the defective Equipment.

                         Buyer's inquiries related to Direct Mail-In service
                         must reference the Buyer's Order number.

             4.2         Advance Authorization Procedure for Replacement-Repair

                         a. Upon Buyer's identification of defective
                            units, Nortel's Replacement-Repair Service
                            Center can be contacted as follows:

                            o Monday through Friday, excepting
                              holidays, from 7:00 am to 6:00 pm,
                              central standard time, telephone
                              1-800-251-1758, option 8 or
                              1-800-423-9658. The call will be received
                              directly by a Customer Service
                              Representative.

                         b. The following information must be provided
                            by the Buyer when calling:

                            o Buyer's ship to address;

                            o Buyer's billing address;

                            o Buyer's Purchase Order number and authorization
                              number;

                            o Urgency of request (normal or emergency);    

<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 5 OF 7


                            

                            o Shipping instructions;

                            o Unit identification (Nortel Product Engineer 
                              Code);

                            o Quantity of units.

                         c. A unique repair order identification number
                            will be issued by Nortel's
                            Replacement-Repair Service Center for each
                            order. Please reference this number on all
                            inquiries.

                         d. Failure tags should be completed and
                            attached to each defective unit.

                         e. Defective units are to be packaged and
                            shipped in accordance with the procedures
                            outlined in the following Sections. The
                            repair order identification number should
                            be clearly marked on the outside of cartons
                            and on all paperwork.

             4.3         Packaging

                         Defective Equipment should be packaged in anti-static
                         containers, preferably of standardized design for
                         circuit packs. (Buyer shall consult with Nortel's
                         Customer Service Representative for information on
                         approved containers.)

                         Note:       Neither bubble pack nor Styrofoam chips
                                     should be used as packaging material. Use
                                     of such material may generate static
                                     electricity which could severely damage a
                                     circuit pack. Use of this material may, at
                                     Nortel's discretion, result in shipments
                                     being refused and/or warranties being
                                     voided.

                         Failure tags should be completed and attached to each
                         unit. Each unit should be wrapped individually.



                        Note:         Failure tags should be attached to the
                                       lock latch of a circuit pack. Please do
                                       not attach the tag to any component on
                                       the circuit pack as this could result in
                                       damage to the Equipment.

                         A copy of the packing list should be placed inside each
                         box to further ensure proper receipt of a multiple box
                         shipment.

             4.4         Basic Shipping Procedure


<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 6 OF 7


                         a.          Buyer shall bear risk of loss and damage on
                                     shipments to Nortel. Nortel shall bear risk
                                     of loss or damage on shipments to Buyer.

                         b.          The Mail-In Form or a packing list (where
                                     advance authorization is required) must be
                                     included. The following information is
                                     required by Nortel:

                                     o Repair order identification (if advance 
                                       authorization replace-ment-repair service
                                       is used);

                                     o Buyer's Order number;

                                     o Buyer's name, ship to address, and 
                                       telephone number to contact in case of a
                                       shipping discrepancy;

                                     o Buyer's bill-to address, contact person,
                                       and telephone number;

                                     o Date shipped;

                                     o Unit identification (Nortel's Product 
                                       Engineering Code);

                                     o Quantity shipped.

                                     Note: Failure to provide the above 
                                           information could result in a delay 
                                           in processing the Order.

                         c.          Buyer shall select an appropriate carrier
                                     based upon the weight and size of shipment.

             4.5         Shipping Costs

                         a.          In Warranty and Out of Warranty

                                     1.           Buyer shall return defective
                                                  Equipment to Nortel prepaid.

                                     2.           Nortel shall ship the
                                                  replacement Equipment to Buyer
                                                  prepaid using an appropriate
                                                  surface carrier. Arrangements
                                                  can be made for air shipments
                                                  at Buyer's expense.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 1
                                                                     PAGE 7 OF 7





             4.6         Unrepairable Equipment

                         a. In Warranty

                            In the event Equipment under warranty is
                            returned to Nortel and is judged by
                            Nortel to be beyond repair due to faulty
                            material or workmanship, Nortel will
                            replace the defective Equipment with a
                            new, repaired, or functionally equivalent
                            unit at no cost to Buyer.

                         b. Out of Warranty

                            In the event Equipment not covered by
                            warranty is returned to Nortel and is
                            judged by Nortel to be beyond repair, it
                            will be returned to the Buyer. Nortel
                            will replace the defective Equipment at
                            Buyer's request, and invoice the Buyer at
                            the then current price for such new
                            Equipment.

             4.7         Non-Return of Defective Units - Buyer Responsibility

                         When Nortel has shipped a replacement unit to Buyer
                         after verbal notification of a defective unit, Buyer is
                         responsible for returning the associated defective
                         Equipment to Nortel within thirty (30) calendar days of
                         the shipping date of its replacement. If Buyer's
                         defective Equipment is not received within such thirty
                         (30) calendar day period, Buyer shall be invoiced the
                         then current price of new Equipment plus fifteen
                         percent (15%). Consequently, an open Purchase Order
                         number must be provided by the Buyer when obtaining a
                         Return Authorization number.

5.           BUYER PROCEDURE FOR SOFTWARE UPDATES                          
                                                                           
             Software updates are to be handled via the normal Advanced    
             Authorization Procedure as set forth in Section 4.2. The Basic
             Shipping procedure contained in Section 4.4 shall be followed 
             except that the Software license(s) shall be returned to Nortel 
             via registered mail.                                     
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 2
                                                                     PAGE 1 OF 5



                           EQUIPMENT/SOFTWARE SUPPORT

1.           WARRANTY SUPPORT

             1.1         Remote (off-site) Assistance

                         Technical support offered at no charge to Buyer during
                         the Warranty Period includes Remote (off-site)
                         assistance to Buyer's trained personnel in resolving
                         Equipment and Software operational and compatibility
                         problems.

                         Remote (off-site) assistance consists of one or more of
                         the following:

                         a. Over-the-phone consultations and guidance at
                            1-800-275-8726.

                         b. Interrogation and analysis of systems over
                            data lines from Nortel's service facility.

                         c. Other activity directly related to problem
                            resolution, where Nortel travel is not
                            involved.

                         If after investigation, Nortel determines that the
                         problem was caused by equipment, software, or
                         conditions not attributable to Nortel then such
                         technical assistance shall be billable to Buyer in
                         accordance with Nortel's current rates and procedures
                         as set forth in Section 3 of this Schedule.

                         Calls to Nortel's service facilities during Nortel's
                         off-hours shall be limited to Equipment or Software
                         failures directly affecting service that Buyer could
                         not resolve by following standard troubleshooting
                         procedures, covered by NTPs.

             1.2         Local (on-site) Assistance

                         Local (on-site) assistance by Nortel field engineers is
                         also available as part of the warranty support. To
                         qualify for Local (on-site) assistance without charge,
                         the following efforts must have been exhausted prior to
                         the field trip:

                         a. Buyer has determined that the Equipment or Software 
                            is the source of the problem; and

                         b. Buyer was unable to resolve the problem by
                            using standard troubleshooting procedures
                            covered by applicable NTP's; and
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 2
                                                                     PAGE 2 OF 5

                         c. Nortel 's engineer could not resolve the
                            problem remotely with full cooperation of
                            Buyer's personnel.

                         Local on-site assistance, provided at Buyer's request,
                         that does not meet above requirements is billable in
                         accordance with Nortel's current rates and procedures
                         as set forth in Section 3 of this Schedule. If after
                         investigation, Nortel determines that the need for
                         Local (on-site) assistance was not caused by the
                         Equipment, Software nor conditions attributable to
                         Nortel then, such technical assistance and associated
                         travel and living expenses shall be billable to Buyer
                         at Nortel's current rates and procedures as set forth
                         in Section 3 of this Schedule.

                         The following types of assistance fall outside the
                         scope of warranty support and are billable;

                         a. Local (on-site) assistance with system
                            verification and pre-service testing, where
                            required by the Buyer.

                         b. Local (on-site) assistance for Software
                            upgrades, where required by the Buyer.

                         c. Analysis to determine origins of the fault
                            and resolution of technical problems
                            associated with equipment or software not
                            furnished by Nortel.

                         d. Non-emergency calls for technical
                            assistance during Service Center off-hours.

                         e. Consultation in excess of 1/2 hour on
                            matters that are adequately covered by
                            standard documentation and/or for which
                            training programs are available, including
                            Software upgrades.

2.           OUT-OF-WARRANTY SUPPORT

             Technical assistance as set forth in Section 1 of this Schedule is
             available for out-of-warranty Equipment and is billable at the
             current rates and procedures as set forth in Section 1 of this
             Schedule.

3.           TECHNICAL SERVICE RATES

             All billable technical services are billed at hourly rate plus
             expenses as defined herein.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 2
                                                                     PAGE 3 OF 5

             Billable expenses include travel, meals and lodging costs for
             Nortel's service representatives, long distance telephone and data
             link charges and other costs which are directly related to the
             service effort. These expenses shall be augmented by fifteen
             percent (15%) handling and administration charge.

             For Local (on-site) assistance service, both work and travel time
             are included and charged as applicable. Minimum charge for Local
             (on-site) assistance service is eight (8) hours plus expenses.

             Minimum charge for Remote assistance service shall be one (1) hour,
             billable according to the rate structure listed below.

             The following standard rates are in effect for these procedures:
    
             i)          REGULAR WORKING HOURS (STD) - * ______
             ii)         OVERTIME 1 RATE (OTT) - * ______
             iii)        OVERTIME 2 RATE (OT2) - *        
                                                   ______ 


<TABLE>
<CAPTION>

Buyer's Local Time    00000             0800             16:30                     2400
                      Midnight          8:00 a.m.        4:30 p.m.             Midnight
- --------------------  ----------------  ---------------  -------------  ---------------
<S>                   <C>               <C>              <C>            <C>
MON-FRI                       OT1               STD                  OT1
- ---------------------------------------------------------------------------------------
SAT                                  OT1                             OT1
- ---------------------------------------------------------------------------------------
SUN/HOLIDAYS                                          OT2
- ---------------------------------------------------------------------------------------
</TABLE>

NOTE:        Nortel observed holidays are. New Year's Day, Memorial Day,
             Independence Day, Labor Day, Thanksgiving Day and the day after,
             and Christmas week.

The telephone number for the Broadband Technical Support Group is as follows:

             Non-Emergency Support:  1-800-ASK TRAN (1-800-27~8726)
             Emergency Support:      1-800ASK ETAS  (1-800-27~3827)

4.           TECHNICAL PROBLEM RESOLUTION OBJECTIVES

             As different types of problems require different levels of
             reaction, a Nortel Priority Classification system is set up to
             establish a relationship between the reported problems and
             appropriate level of reaction and resolution. The Priority System
             is based upon problem's direct or potential effect upon subscriber
             service. Each reported problem is assigned priority rating
             accordingly.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 2
                                                                     PAGE 4 OF 5

             The Priority System has five levels:

                         E1 - Emergency: Severe Degradation or Outage

                         E2 - Emergency: Potential Degradation or Outage

                         S1 - Non-Emergency: Service-Affecting Problem

                         S2 - Non-Emergency: Intermittently Service Affecting

                         NS - Non-Service Affecting Problem

             The resolution objective for E1 or E2 Emergency classification is
             immediate and continuous assistance until the service level is
             restored to pre-incident operation. For assistance in such E1 or E2
             Emergency, please call 1-800-275-3827. The resolution objective for
             non-emergency condition is to provide a status response in two (2)
             weeks and solution to the problem in four (4) weeks for S1
             Classification or eight (8) weeks for S2. The resolution objective
             for non-service affecting condition is to provide a status response
             in six (6) weeks and a fix, if applicable, will be scheduled for
             future standard hardware, software or documentation update or
             revision.

             THESE OBJECTIVES DO NOT CONSTITUTE CONTRACTUAL OBLIGATION UPON
             NORTEL, BUT ARE GENERALLY IN SUPPORT OF THE TERMS AND CONDITIONS OF
             THIS AGREEMENT. NORTEL RESERVES THE RIGHT TO EXERCISE JUDGMENT ON
             THE ECONOMIC OR STRATEGIC BENEFITS OF EXECUTING ACTIONS ON ALL
             REPORTED OR ANTICIPATED PROBLEMS. THIS MAY RESULT IN AN ACTION
             DIFFERENT FROM THOSE DESCRIBED. IN SUCH CASE, THE CUSTOMER WILL BE
             INFORMED.

             The following is a detailed description of priority ratings:

                         E1 - Emergency: Severe Degradation or Outage

                         i)          System ceased call processing
                         ii)         10% or more subscribers out of service;
                         iii)        50% or more trunk circuits out of service;

             E2 - Emergency: Potential Degradation or Outage

                         i)          Redundant Common Equipment inoperable
                         ii)         20% or more trunk circuits out of service;
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 2
                                                                     PAGE 5 OF 5


             S1 - Service Affecting Problem

                         i)  Problems directly and continuously affecting
                             subscriber service, not
                             specified under E1 or E2;

                         ii) Problems that will seriously impair service after
                             in-service date;

             S2 - Intermittently Service Affecting Problem

                         i)  Software and hardware faults that only 
                             intermittently affect service;

                         ii) Documentation errors that result or lead to service
                             impairments;

                         iii)Problems where operating company can show
                             significant impact upon plant and traffic
                             operations;

             NS - Non-Service Affecting Problem

                         i)  Service analysis, operational
                             measurements, or system related
                             documentation inaccuracies that do not
                             affect call processing or revenue
                             collection capabilities;

                         ii) Non-service affecting software inconsistencies;

                         iii)Loss of test facilities for which manual
                             procedures or alternate test equipment can
                             be readily substituted.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 3
                                                                     PAGE 1 OF 2

                                    TRAINING

The Nortel training program offers Buyer courses for all S/DMS AccessNode
Product covered by this Agreement at Nortel's then current charge for such
courses.

"In-house" courses are given at training facilities located at Nortel's Regional
Training Centers. Fully equipped with captive systems covered in the course
offering, the student gains extensive "hands-on" experience at the Nortel
training facilities. Courses may also be given at a customer's "on-site"
location where appropriate facilities and equipment are available. Nortel
recommends students attending "In-house" courses when possible as "on-site"
courses generally do not offer as effective a presentation environment and also
limits "hands-on" experience.

All courses offer students with standard training material presented by
qualified instructors. Maintenance courses cover an explanation of the
transmission principles involved, installation, operation, maintenance
(including fault locate procedures for trouble-shooting equipment and circuit
replacement), and a thorough review of Nortel's product documentation (NTP's).

For scheduling of courses, determining presentation locations, and availability
of seats, please contact Nortel's Training Coordinator in Raleigh, North
Carolina at (919) 859-8400.

"IN-HOUSE" TRAINING

Courses are offered at the Nortel Regional Training Center located in Raleigh,
North Carolina.

"In-house" training courses normally accommodate up to eight (8) students with
seats filled on a "first come/first served" basis. Courses may be subject to
rescheduling if a minimum class size is not met.

Course charges are per student for each course with travel and living expenses
paid by Buyer. Nortel will provide information on local accommodations.

Nortel will confirm in writing the course dates for each student. After
confirmation, cancellation requires at least two (2) weeks notice prior to
course commencement.

"ON-SITE" TRAINING

Many of the training courses may be conducted at the Buyer's facilities
"on-site". Two (2) months advance notice is required to schedule these courses
with Buyer providing access to working equipment. Buyer also provides all test
equipment for training. Nortel can arrange for test equipment to be available at
additional charges of up to $2000 if Buyer does not have all requisite
equipment.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 3
                                                                     PAGE 2 OF 2


Charges for "on-site" training are on a per-course basis with a maximum of ten
(10) students to attend such courses unless otherwise stated. The course fee
does not cover the instructor's travel and living expenses. If Buyer cannot
provide suitable training facilities including audio/visual equipment, charges
for such equipment incurred by Nortel will be billed to the Buyer.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                           SCHEDULE B, SECTION 4
                                                                     PAGE 1 OF 1

                                 SERVICE CHARGES


1.           REPAIR/REPLACEMENT - EQUIPMENT

<TABLE>
<CAPTION>
                                            IN-WARRANTY*      OUT-OF-WARRANTY*
                                            ------------      ----------------
             <S>                            <C>               <C>              
             Normal Service                 No charge         Standard unit charges
             (30 days)                                        per current price list

             Emergency Service (24 hours)

             1.  Requested 8:00 AM-         $50 surcharge     $50 surcharge
                 6:00 PM EST weekdays       per unit          per unit plus standard
                                                              unit charges per
                                                              current price list

             2.  Requested weekends,        $100 surcharge    $100 surcharge per unit
                 holidays, and weekdays     per unit          plus standard unit charges
                 6:01 PM - 7:59 AM EST                        per current price list
</TABLE>




*Maximum charge is $250 for items on the same Order requiring emergency service.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                      SCHEDULE C
                                                                     PAGE 1 OF 1

                               DELIVERY INTERVALS

    
PRODUCT               FORECASTED             UNFORECASTED
- -------               ----------             ------------
S/DMS AccessNode      *                      * 
                      -------------          -------------------         
Notes:

1.           All After Receipt of Order ("AROCHEM") intervals are based on
             standard type Product.
<PAGE>
 
                                                        AGREEMENT NO. JRD0197FCC
                                                   ACCESSNODE PRODUCT ATTACHMENT
                                                                      SCHEDULE D
                                                                     PAGE 1 OF 1

                                    FORECAST


TO BE PROVIDED BY CUSTOMER

<PAGE>
 
    
        *Certain portions of this Exhibit have been omitted where indicated by
an "*" pursuant to a request for confidential treatment, and the omitted
portions have been separately filed with the Commission.      
 
                                                                    Exhibit 10.6

                          AMENDMENTS No. 1 & 2 TO THE

                      NETWORK PRODUCTS PURCHASE AGREEMENT

                                    BETWEEN

                             NORTHERN TELECOM INC.

                                      AND

                      FOCAL COMMUNICATIONS CORPORATION --

                        DELETED FOR SEC CONFIDENTIALITY


     THIS AMENDMENT No. 1 TO NETWORK PRODUCTS PURCHASE AGREEMENT, Carrier
Networks Products, is dated effective as of the date executed by the latter of
the parties below, (the "Amendment No. 1"), is by and between Northern Telecom
Inc. ("Nortel") and Focal Communications Corporation ("Buyer"), and amends the
Network Products Purchase Agreement Number JRD0197FCC, dated January 21, 1997
("NPPA"), by and between Nortel and Buyer;

     WHEREAS, the parties wish to amend the NPPA to reflect a change in the
address of the Buyer; and

     NOW, THEREFORE, for the consideration shown below, the parties hereby amend
the NPPA as follows:

1.   The Buyer's address for purposes of billing and notice pursuant to the
     preamble and Section 18.5, is amended and restated as follows:

                    Focal Communications Corporation
                    200 N. LaSalle Street
                    Chicago, Illinois 60601
                    Attn.:  Executive Vice President
                    Facsimile:  (312) 895-8403
<PAGE>
 
NORTHERN TELECOM INC.                        FOCAL COMMUNICATIONS
                                             CORPORATION


By: /s/ Vickie Yohe                          By: /s/ John R. Barnicle
   --------------------------------              -----------------------------
        Signature                                    Signature


Name: Vickie Yohe                            Name: John R. Barnicle
     ------------------------------                ---------------------------  
      Print                                        Print


Title: Group VP, Carrier Networks            Title: E.V.P. - C.O.O.
      -----------------------------                ---------------------------


Date:  March 6, 1998                         Date: February 17, 1998
     ------------------------------                ---------------------------

                                      -2-
<PAGE>
 
                     AMENDMENT No. 2 TO PRODUCT ATTACHMENT

                           CARRIER NETWORKS PRODUCTS

                                    BETWEEN

                             NORTHERN TELECOM INC.

                                      AND

                       FOCAL COMMUNICATIONS CORPORATION


     THIS AMENDMENT No. 2 TO PRODUCT ATTACHMENT, Carrier Networks Products, is
dated effective as of the date executed by the latter of the parties below, (the
"Amendment No. 2"), is by and between Northern Telecom Inc. ("Nortel") and Focal
Communications Corporation ("Buyer"), and amends the Product Attachment, dated
January 21, 1997 (the "Product Attachment"), as amended by Amendment No. 1 to
Product Attachment, dated June 10, 1997 (the "Amendment No. 1"), which are
attached to the Network Products Purchase Agreement Number JRD0197FCC, dated
January 21, 1997 ("NPPA"), by and between Nortel and Buyer;

     WHEREAS, the parties wish to amend the Product Attachment and the Schedule
A attached thereto to reflect a change in Buyer's commitment and Buyer's desire
to purchase additional Products and Services from Nortel; and

     NOW, THEREFORE, for the consideration shown below, the parties hereby amend
the Product Attachment and Schedule A as follows:

1.   "Product Attachment Term", as defined in Section 2.0, "Definitions" is
     amended and restated to read:

     "Product Attachment Term" shall mean the period of time which shall
     commence on the date this Amendment No. 2 to Product Attachment is executed
     by the latter of the parties and shall expire thirty six (36) months
     thereafter.

2.   Section 3, entitled "Scope", in the Product Attachment is amended and
     restated as follows:
    
     (a)  Buyer shall issue Orders for delivery and installation of the Products
          listed in the attached Schedule A, in the minimum amount of
          *_________________________ every twelve (12) months during the Product
          Attachment Term, for a total minimum commitment amount of
          *_______________________________ during the Product Attachment Term
          (the "Commitment Amount"). Included within the Commitment Amount,
          Buyer shall purchase a minimum of *_______________ DMS-500 Initial
          Systems, as      

<PAGE>
 
          described in the attached Schedule A, Part I, Section 1.0. Buyer shall
          pay the prices, fees and charges for the Products in accordance with
          Section 7 of this Product Attachment.
    
     (b)  In the event that Buyer does not purchase a minimum of
          *__________________ in Product every twelve months during the Product
          Attachment Term, Nortel shall invoice annually and Buyer shall pay
          *_______________ percent _______ of the difference between
          *_______________________ and the amount actually spent by the Buyer
          during that twelve (12) month period of time, within thirty (30) days
          from the date of invoice.      
    
     (c)  In the event that Buyer exceeds the purchase amount of *____________
          in Product every *__________________________ during the Product
          Attachment Term, Buyer shall receive an annual credit to be applied to
          Buyer's purchase of an Optional Software described in Schedule A, Part
          III, Section 1.0 and to any Software Upgrades described in Schedule A,
          Part I, Section 1.4 excluding any required hardware for feature
          functionality (the "Software Credit"). Such Software Credit shall be
          equal to *____________________________________________ up to a maximum
          of *________________________________________. Upon the expiration of
          the Product Attachment Term contemplated by this Amendment No. 2, all
          remaining Software Credits shall expire.     
    
     (d)  Buyer may issue Orders for the DMS-500 Optional Software described in
          the attached Schedule A, Part III, Section 1.0, from time to time
          during the Product Attachment Term. Buyer shall receive a
          *_______________________ discount on the prices, fees and charges set
          forth in the attached Schedule A, Part m, Section 1.0, on any DMS-500
          Optional Software Order included within or submitted in connection
          with Buyer's Order for a DMS-500 Initial System described in Schedule
          A, Part I, Section 1.0. Otherwise, Buyer shall receive a
          *_________________ discount on the prices, fees and charges set forth
          in the attached Schedule A, Part III, Section 1.0, on any DMS-500
          Optional Software Order issued at any other time during the Product
          Attachment Term.      

     (e)  Buyer shall receive a one (1) time forty five percent (45%) discount
          on the initial Merchandise Order issued by Buyer during each quarter
          during the Product Attachment Term, and a thirty percent (30%)
          discount on all subsequent Merchandise Orders issued by the Buyer
          during each quarter during the Product Attachment Term.

     (f)  No later than November 1st of each year during the Product Attachment
          Term, Buyer shall provide to Nortel a written forecast listing the
          Products that Buyer intends to order for delivery and installation
          during the following twelve (12) months of the Product Attachment Term
          (the "Annual Forecast"). The initial Annual Forecast is set forth in
          the attached Schedule C. Buyer may revise its then-current Annual
          Forecast from time to time, and, upon submission of the revised Annual
          Forecast to Nortel, each such revised Annual Forecast shall supersede
          all Annual Forecasts that were previously submitted to Nortel.

     (g)  Nortel shall perform an in-process and final audit for each and every
          Initial System purchased and installed hereunder prior to the Turnover
          Date as described in Section 8 of this Product Attachment. Also,
          Nortel shall perform a final audit for each and every Extension
          purchased and installed hereunder prior to the Turnover Date.

                                      -2-
<PAGE>
 
     
     (h)  During the Product Attachment Term, Buyer shall purchase from Nortel 
*_____________ "Class 4" and "Class 5" switches (as those terms are used in the 
telecommunications industry), except that Buyer shall be relieved of Buyer's 
obligation to purchase *_____________________ "Class 4" and "Class 5" switches 
in the event that Buyer acquires or merges with an entity which, at the time of 
the merger and acquisition, operates "Class 4" and "Class 5" switches not 
manufactured by Nortel.     
    
     (i)  In the event that Nortel, through no fault other than its own, fails 
to effect Turnover of an Initial System no later than *_______________________ 
after the date upon which the Installation Services commenced, Nortel shall pay 
to Buyer, as liquidated damages and not as a penalty, and as Buyer's sole and 
exclusive remedy, the amount of *_______________________________ per day for 
each day that Turnover is delayed beyond such *_______________________________. 
In no event shall Nortel's liability under this provision exceed *___________ 
for each Initial System ordered by Buyer hereunder.     

3.   Section 11, entitled "Additional Terms", in the Product Attachment is
     amended and restated as follows:

     (c)  In the event that Nortel elects to discontinue the manufacture of any
          Product described in the attached Schedule A at any time during the
          seven (7) years following the Turnover Date of each Initial System
          ordered hereunder, then Nortel shall provide Buyer with written notice
          of such discontinuance at least twelve (12) months prior to the
          scheduled date of such discontinuance. During the twelve (12) month
          period following Buyer's receipt of such notification from Nortel,
          Buyer may order and Nortel shall deliver as much of the Products
          described in the attached Schedule A as Buyer reasonably requires at
          the then current prices and/or licensing fees. Nothing herein shall be
          construed so as to require Nortel to continue to manufacture any
          Products described in the attached Schedule A.

     (d)  Deleted.

4.   All provisions of Schedule A as attached to the Product Attachment and
     Amendment No. 1 are hereby deleted and replaced with the Schedule A
     attached hereto.

5.   Schedule C to the Product Attachment is hereby deleted and replaced with
     the Schedule C attached hereto.


                                      -3-
<PAGE>
 
NORTHERN TELECOM INC.                  FOCAL COMMUNICATIONS
                                       CORPORATION


By: /s/ Vickie Yohe                    By: /s/ John R. Barnicle
   --------------------------------        -----------------------------
        Signature                              Signature


Name: Vickie Yohe                      Name: John R. Barnicle
     ------------------------------          ---------------------------       
      Print                                  Print


Title: Group VP, Carrier Networks      Title: E.V.P. - C.O.O.
      -----------------------------           --------------------------


Date:  March 6, 1998                   Date: February 17, 1998
      ------------------------------         ---------------------------
 
                                      -1-
<PAGE>
 
                                  SCHEDULE C
                                  --------- 

                           SWITCH DELIVERY FORECAST
                           ------------------------

                                                                       Purchase
Switch Type/#      Destination      Delivery Date       Ports          Price*

    
* The entire Section C is subject to Focal's Confidentiality Request and has 
  been omitted from this Filing.      

* Denotes ports and price for each DMS-500 and/or Extension.
<PAGE>
 
                                  Schedule A
                        Part I. DMS-500 Initial System
                          (DMS-500 Switching System)

Nortel shall engineer each Initial System ordered hereunder in accordance with
Nortel's standard engineering practices and procedures, and thereafter Nortel
shall provide Buyer with a detailed list of the components of such Initial
System.

1.0 Initial System DMS-500

     1.1 The following represents the SuperNode Equipment that will be delivered
     with the Initial System DMS-500 switch:
    
          Information from Section 1.1 has been deleted.* (Two pages of 
          information have been deleted from section 1.1).      

     1.2  Initial System DMS-500
    
          The price for the Initial System DMS-500 equipped and wired as
          described in Section 1.1 above, and the fee for the license of the
          Software is *___________.      

     1.3  Power Plant to support the above DMS-500 Initial System (Optional):

          1.3.1  Power Plant
    
                    *Information from Section 1.3.1 has been deleted.      

          1.3.2  Battery Distribution Fuse Bay
    
                    *Information from Section 1.3.2 has been deleted.      

     1.4  Software Upgrades for the DMS-500 Initial System (Optional):
    
                    *Information from Section 1.4 has been deleted.      
    
          1.4.1  The price for the NCS05 (LLTOB005-Local/Toll) to NCS06
                 (LLDOB006-Local/Toll) Software Upgrade is *___________________.
     
    
          1.4.2  The price for the NCS05 (LLTOB005-Local/Toll) to NCS07
                 (LLTOB007-Local/Toll) Software Upgrade is *___________________.
     
    
          1.4.3  The price for the NCS05 (LLTOB005-Local/Toll) to NCS08
                 (LLTOB008-Local/Toll) Software Upgrade is *___________________.
     
    
          1.4.4  The price for the NCS06 (LLDOB006-Local/Toll) to NCS08
                 (LLTOB008-Local/Toll) Software Upgrade is *___________________.
     

                                     - 2 -
<PAGE>
 
     
          1.4.5  The price for the NCS07 (LLTOB007-Local/Toll) to NCS08
                 (LLTOB008-Local/Toll) Software Upgrade is *___________________.
     

                                  Schedule A
                  Part II. DMS-500 Standard Software Features
                               (DMS-500 System)

1.0  DMS-500 Standard Software Features

     1.1  Nortel may deliver Software ordered hereunder in a single Software
          load which may include Software which Buyer has not yet licensed 
          ("Non-licensed Software"). Except as set forth in Section 1.2 below,
          Buyer shall not be entitled to use such Non-licensed Software, until
          such time as the applicable right to use fees are paid by Buyer
          pursuant to Section 1.5.

     1.2  Upon Buyer's placement of any Non-licensed Software in revenue
          generating service, Buyer shall pay the applicable right-to-use fees
          for such Non-licensed Software pursuant to this Agreement, except as
          described in Section 1.2. Buyer shall also have the option to pay the
          applicable right-to-use fees for any Non-licensed Software upon
          installation of a Software load containing such Non-licensed Software.
          For any Non-licensed Software that is installed and added pursuant to
          a product computing module load ("PCL") and or non-computing module
          load ("NCL"), if any, the right-to-use fees shall be the list price
          for such feature in effect as of the date of activation.

     1.3  To ensure Buyer's proper activation and/or usage of the appropriate
          Software, Buyer shall properly notify Nortel at the address specified
          in Section 9 of this Product Attachment to the attention of Director,
          Sales Engineering, prior to the activation and/or usage by Buyer of
          any Software. Buyer shall identify all Software being activated and/or
          used (including the number of units activated, if applicable) in each
          Initial System.

     1.4  Nortel shall promptly review notification from Buyer provided pursuant
          to Section 1.4 above and identify any applicable prerequisite
          Equipment or Software required by Buyer prior to activation and/or
          usage of the applicable Software. Nortel shall respond to Buyer's
          written notice by means of a price quotation. Such price quotation
          shall include Nortel's consent to activate and/or use such Software or
          notification that such Software requires engineering to determine
          whether the current switch configuration will require additional
          Equipment prior to activation and/or usage. Upon Buyer's written
          acceptance of Nortel's price quotation, Nortel shall grant its consent
          to Buyer to activate and/or use such Software prior to payment of the
          applicable right-to-use fees. However, under no circumstances shall
          such Software be activated and/or used by Buyer prior to Buyer's
          acceptance of Nortel's price quotation. Nortel shall invoice Buyer for
          all applicable right to use fees and associated feature

<PAGE>
 
          activation engineering charges. One hundred percent (100%) of such
          invoiced right to use fees and engineering charges shall be due and
          payable within thirty (30) days of the date of Nortel's invoice
          therefor.

     1.5  Notwithstanding the foregoing, Buyer shall not be required to pay
          additional right to use fees associated with the Software licensed
          prior to the initial date of this Product Attachment.

     1.6  Nortel reserves the right, every six (6) months to submit a written
          report for each site containing a Software load. The written report
          shall identify all Software activated and/or used (including the
          number of incremental units activated, if applicable) by Buyer during
          the applicable reporting period. Buyer shall audit the report against
          Purchase Order(s) which have been submitted by Buyer and accepted by
          Nortel during the applicable period to determine the existence of any
          discrepancies. Buyer shall submit such audited written report to
          Nortel at the address specified in Section 9 of this Product
          Attachment to the attention of Director, Sales Engineering, within
          thirty (30) days from receipt of such request.

     1.7  Nortel also reserves the right to access by remote polling or to
          conduct an on-site inspection of any site in which a Software load is
          installed and/or to perform an on-site review of Buyer's books and
          records related to such site to verify activation and/or usage of
          Software.

     1.8  Nortel shall issue invoices, for any applicable prices, charges or
          fees, in addition to those amounts previously invoiced, as a result of
          Buyer's activation and/or usage of any Software that does not appear
          on Nortel's written report or that appear as a result of Nortel's
          remote polling of an Initial Systems.

     1.9  Upon payment of the applicable right to use fees for Software
          activated and/or used by Buyer, Buyer shall receive a non-exclusive
          paid-up license to use such Software in accordance with the provisions
          of this Agreement. Nortel may immediately terminate the applicable
          license granted hereunder for Buyer's failure to pay the applicable
          right to use fees for such Software which has been activated and/or
          used.

     1.10 The obligations of Buyer under this Section 1 shall without limitation
          survive the termination of this Agreement and shall continue if the
          Software is removed from service. Buyer agrees to indemnify Nortel or
          Third Party Software Vendors as appropriate for any loss or damage
          resulting from a breach of this Section 1.

2.0  LLDOB008 Software included in the DMS-500 Initial System

                                     - 2 -
<PAGE>
 
     2.1  Software included in the DMS-500 Initial System

          The following represents the LLDOB008 Software packages that are
          included in the price of the DMS-500 Initial System, described in
          Schedule A, Part 1, Section 1.0. The following is a list of Software
          only and does not include any/all required Equipment to provide
          feature functionality.

          S/W Package         Description
          -----------         -----------
    
          *The information from this section has been deleted.      

                                     - 3 -
<PAGE>
 
                                  Schedule A
     Part III. DMS-500 Complete (Optional and Standard) Software Features
                               (DMS-500 System)


1.0  LLDOB008 Complete Software Features

     1.1  Complete Software Features

          The following represents all of the LLWB008 software packages that can
          be licensed on a DMS500 System. The following is a list of Software
          only and does not include any/all required Equipment to provide
          feature functionality.

          1.1.1     Standard Software Features

                    If the Software package IS LISTED in Schedule A, Part II,
                    and CONTAINS an "L" in the "License Status" column, such
                    Software packages ARE LICENSED to the Buyer as part of the
                    Standard Software load for the DMS-500 Initial System. The
                    price of that Software package IS INCLUDED in the price of
                    the DMS-500 Initial System set forth in Schedule A, Part I,
                    Section 1.2.

          1.1.2     Optional Software Features

                    If the Software package IS NOT LISTED in Schedule A, Part II
                    and DOES NOT CONTAIN an "L" in the "License Status" column,
                    such Software packages IS NOT LICENSED to the Buyer as part
                    of the Standard Software load for the DMS-500 Initial
                    System. The price of that Software package IS NOT INCLUDED
                    in the price of the DMS-500 Initial System set forth in
                    Schedule A, Part I, Section 1.2. Such Software Package may
                    be purchased by the Buyer under the Product Attachment as
                    Optional Software for the DMS-500 Initial System.
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 
L                 BASE0001          BASE                                        See Note         The Office license fee is:
Local/                                                                                           Local:$90,000;
Toll only                                                                                        Toll: $194,800
                                                                                                 Local/Toll/TOPS:$196,300;
                                                                                                 STP:$62,500; LD:$179,300;
                                                                                                 Local/Toll/TOPS/LD:$214,230;
                                                                                                 GSP:$194,800;
                                                                                                 GWY:$193,000;
                                                                                                 LD/GWY:$197,400

                  BASE0011          BASE CO Data Chg Capture                    $50,000

                  BASE0005          BASE SN SR50 Processor                      $633,000         The upgrade fee if previously
                                                                                                 licensed from: BASE0004 =
                                                                                                 $208,000 BASE0003 =
                                                                                                 $388,000 BASE0002 =
                                                                                                 $602,000

                  BASE0006          BASE SN SR60 Processor                      $696,000         The upgrade fee if previously
                                                                                                 licensed from: BASE0005 =
                                                                                                 $63,000BASE0004 = $271,000
                                                                                                 BASE0003 = $451,000
                                                                                                 BASE0002 = $665,000

L                 BASE0009          BASE SN SR70 Processor                      $881,000         The upgrade fee if previously
                                                                                                 licensed from: BASE0006
                                                                                                 =$185,000 BASE0005 =
                                                                                                 $248,000BASE0004 =
                                                                                                 $456,000 BASE0003
                                                                                                 =$636,000 BASE0002 =
                                                                                                 $850,000

                  BASE0008          BASE SNSE SR60 Processor                    $350,000         The upgrade fee if previously
                                                                                                 licensed from: BASE0007 =
                                                                                                 $350,000

                  BASE0010          BASE SNSE SR70 Processor                    $440,000         The upgrade fee if previously
                                                                                                 licensed from: BASE0008 =
                                                                                                 $90,000 BASE0007 =
                                                                                                 $440,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  ACD00001          ACD ACD Base                                See Note         The fee is $500 per ACD line
                                                                                                 plus $5,000 per ACD user
                                                                                                 group.

                  ACD00017          ACD Agent Increase                          See Note         The fee is $500 per ACD line for
                                                                                                 agents 5,001 to 10,000.
                                                                                
                  ACD00016          ACD Group Increase                          See Note         The fee is $5,000 per ACD
                                                                                                 user group for groups 257 to
                                                                                                 1024.

                  ACD00005          ACD MIS                                     See Note         The fee is $250 per ACD line.

                  ACD00006          ACD Miscellaneous                           $52,000

                  ACD00011          ACD Routing Enh.                            $6,000

                  ACD00019          ACD CompuCall Agt Desktp                    See Note         The fee is $2,000 per Switched
                                                                                                 Virtual Circuit.

                  ACD00002          ACD Compucall                               See Note         The fee is $7,500 per switched
                                                                                                 virtual circuit.

                  ACD00014          ACD CompuCALL RSBBScr                       See Note         The fee is $50.00 per ACD
                                                                                                 line.

                  ACD00013          ACD CompuCALL SCallCtrl                     See Note         The fee is $2,000 per Switched
                                                                                                 Virtual Circuit.

                  ACD00007          ACD Compucall-Func                          See Note         The fee is $42,000 per
                                                                                                 switched virtual circuit.

                  ACD00008          ACD Ctrx Coord V&Dta                        See Note         The fee is $5,000 per 100
                                                                                                 Centrex Iines.

                  ACD00004          ACD Networking                              See Note         The fee is $25,000 for the first
                                                                                                 100 Network ACD lines plus
                                                                                                 $500.00 per Network ACD line
                                                                                                 over the first 100.

                  ACD00010          ACD Network ACD on PRI                      See Note         The fee is $400.00 per ACD
                                                                                                 line.

                  ACD00009          ACD Network ACD on SS7                      See Note         The fee is $400.00 per ACD
                                                                                                 line.

                  AIN00002          AIN Essentials                              $700,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  AIN00001          AIN Primer                                  See Note         The fee is $80,000 Net (not
                                                                                                 subject to any discounts) to be
                                                                                                 paid annually.

                  AMA0001           AMA BASE                                    No Charge

                  AMA0004           AMA MOD [CAMA                               13,000
                                    MODULES]

                  AMA0002           AMA MOD [LAMA                               $11,000
                                    MODULES]

L                 BAS00001          BAS AMA-Cook                                $9,000

L                 BAS00028          BAS High Capacity DPP                       $15,000

L                 BAS00002          BAS ANI                                     $30,000

L                 BAS00004          BAS Generic - OAM                           $15,000

                  BAS00050          BAS 56Kb/S Trk Tst prt                      $15,000

                  BAS00024          BAS Offnet Access Svcs                      See Note         The fee is $22,960 per Switch
                                                                                                 and $11,500 per DTC.

L                 BAS00003          BAS Generic                                 See Note         The office license fee is:
Local/                                                                                           Local:$297,700; Toll:$122,200;
Toll only                                                                                        Local/Toll:$299,200;
                                                                                                 Toll/TOPS:$122,200;
                                                                                                 Local/Toll/TOPS:$299,200;
                                                                                                 Local/Toll/LD:$299,200;
                                                                                                 Local/Toll/TOPS/LD:
                                                                                                 $299,200.  Plus a SMA license
                                                                                                 fee of $10,000 per SMA and
                                                                                                 SMA2 module.

                  BAS00049          BAS ABBT LM-Cut Re-wrt                      $8,000

                  BAS00062          BAS ANI for E911 Abandon                    $5,700

                  BAS00064          BAS Black Box Fraud                         $34,300

                  BAS00063          BAS Enh Line Card Mon                       $5,700

                  BAS00041          BAS Enh Permanent Signal                    $40,000

L                 BAS00020          BAS Flex Bellcore AMA                       $7,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 
                  BAS00021          BAS MAP TELNET Access                       No Charge

                  BAS00022          BAS SDM Table Access                        No Charge

L                 BAS00007          BAS Logs                                    $10,000

                  BAS00009          BAS RSC-S                                   See Note         The fee is $120,000 per
                                                                                                 module incremental.

                  BAS00012          BAS Remotes Generic                         See Note         The fee is $22,500 plus
                                                                                                 $700.00 per LCM/LCME in
                                                                                                 the Remote office plus
                                                                                                 $5,500/Remote

                  DTP00001          DTP Datapath                                $17,500

                  DTP00003          DTP DataCall Tester                         No Charge

                  ENS00005          ENS E911                                    $15,000

                  ENS00002          ENS ACD PSAP                                See Note         The fee is $47,000 plus $2,000
                                                                                                 per E911 position. The fee is
                                                                                                 $32,000 plus $2,000 per E911
                                                                                                 position if ENS00001 has been
                                                                                                 previously licensed.

                  ENS00009          ENS Conf Compatibility                      $20,000

                  ENS00008          ENS Enha Called Pty Hld                     $30,000

                  ENS00001          ENS LDTPSAP                                 $125,000

                  ENS00004          ENS Large SRDB                              See Note         If more than 1 million records
                                                                                                 are required the fee is
                                                                                                 $195,000. If less than 1 million
                                                                                                 records are required the fee is
                                                                                                 $145,000.

L                 EQA00001          EQA Local                                   See Note         The fee is $52,000 plus $4,800
                                                                                                 per LGC/LGCI, $4,800 per
                                                                                                 LTC/LTCI, and $1,600 per
                                                                                                 LME. The total fee shall not
                                                                                                 exceed $72,000 per office.

L                 EQA00006          EQA C71SUPlrita CntnEAEO                    $1 00,000

                  EQA00004          EQA Cellular Interconnect                   $25,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  EQA00003          EQA Cellular Interconnect-EO                $15,000

                  EQA00007          EQA EA Alt Sw Point                         $35,000

                  EQA00025          EQA EQA Call Attrb Ctl                      $8,000

                  EQA00010          EQA Enh WATS                                $20,000
                                    opratn[POTS

                  EQA00011          EQA Equal Access OSS                        $8,000

                  EQA00009          EQA IBN iraLATA                             $20,000
                                    PIC EAEO

                  EQA00026          EQA International PIC                       $40,000

                  EQA00015          EQA IntraLATA PIC Enh Ph1                   $20,000

                  EQA00019          EQA IntraLATA PIC Ph2                       $9,500

                  EQA00024          EQA Override LPIC Priv                      $12,000

L                 EQA00008          EQA POTS IraLATA PlCeaeo                    $20,000

                  EQA00002          EQA Toll                                    See Note         The fee is $100,000 plus
                                                                                                 $4,800 per DTC/DTCI, $1,200
                                                                                                 per DCM and $300.00 per TM.
                                                                                                 The total fee shall not exceed
                                                                                                 $190,000 per office.

                  EQA00012          EQA C71SUPlerLta Conn AT                    $120,000

                  EQA00005          EQA Intermediate Tandem                     $20,000

                  ICM00020          ICM Call Queue Managemt                     See Note         The fee $250 per ACD Agent and/or
                                                                                                 Centrex line.
                                                                     
                  ICM00010          ICM Call Center Server                      See Note         The fee $250 per ACD Agent

                  ICM00001          ICM Call Manager l/F                        See Note         The fee $18,750 per switch
                                                                                                 plus $125 per ACD Agent
                                                                                                 and/or Centrex line.

                  ISDN0003          ISDN Line Drawer                            No Charge

                  ISDN0004          ISDN Line Drawer Nl-1 Enh                   No Charge
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  ISUP0001          ISUP Cellular                               $150,000

                  LEA00002          LEA LEAS Local                              $22,500

                  LEA00001          LEA LEAS Toll                               See Note         The fee is $145,000 for the
                                                                                                 first 50,000 Directory numbers
                                                                                                 plus $20,000 for each
                                                                                                 additional Group of 10,000
                                                                                                 Directory numbers over the
                                                                                                 first 50,000.

                  LEA00003          LEA SS7 I/W with LEAS                       $30,000

                  LOC00002          LOC Carrier Parameter                       $20,000

                  LOC00005          LOC Dial Plan Transl Enh                    $18,000

                  LOC00011          LOC End Office OA AMA                       $10,000

L                 LOC00001          LOC Services                                $10,000

                  LOC00006          LOC Intersw Call Trace                      $20,000

                  MDC00002          MDC - MDC MSAC                              $21,700

                  MDC00027          MDC Att Cons CF Recall                      $2,000

100               MDC00001          MDC - MDC Minimum                           See Note         The fee is $49,250 plus $1,750
                                                                                                 per group of 100 MDC lines,
                                                                                                 not to exceed $404,000 per
                                                                                                 office. The first 100 MDC lines
                                                                                                 are included in the base price.

                  MDC00050          MDC Cl Com-CFX Table Chg                    $7,000

                  MDC00056          MDC Code Restriction Grp                    $2,000

L                 MDC00003          MDC - MDC Standard                          $173,500

                  MDC00038          MDC CDAR-1A                                 $7,500
                                    TRANSPARENCY

                  MDC00042          MDC Call Forward Timed                      $7,000

                  MDC00020          MDC Personal Call Screen                    $5,000

                  MDC00004          MDC CLASS on MDC                            $23,500
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  MDC00010          MDC CLASS on MDC/                           $25,000
                                    MVP II

                  MDC00053          MDC CSMI                                    No Charge

                  MDC00040          MDC SCWID/DSCWID                            No Charge

                  MDC00035          MDC Teen Service                            See Note         The fee is $5,000 per 100
                                                                                                 MDC lines

                  MDC00005          MDC MBG Min                                 $73,500

                  MDC00006          MDC MBG Std                                 $167,500

                  MDC00055          MDC Auto Attndnt -RLT                       $2,000

                  MDC00045          MDC Conn Nm Disply Blkng                    $10,000

                  MDC00025          MDC NETNAME Expand                          $2,000

                  MDC00007          MDC MBS Minimum                             $9,900

                  MDC00008          MDC MBS STD                                 $50,000

                  MDCOOOO9          MDC MDC PRO                                 $239,200

                  MDC00034          MDC Enhanced WATS                           $20,000

                  MDC00018          MDC MDR VIA AMA                             $20,000
                                    STREAM

                  MDC00033          MDC Name/DN Blkng                           $15,000

                  MDC00011          MDC PVN                                     $195,000

                  MDC00036          MDC SMDR for PVN                            $15,000

                  MDC00044          MDC Per Ln Feature Cntrl                    $12,500

                  MDC00024          MDC TCAP Name Delivery                      $37,000

                  MDC00012          MDC Tailored MDC 1                          $26,500

                  MDC00013          MDC Tailored MDC 2                          $40,000

                  MDC00019          MDC MBS installer Tools                     $30,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  MDC00014          MDC Tailored MDC 3                          $45,000

                  MDC00015          MDC Tailored MDC 4                          $30,000

                  MDC00016          MDC Tailored NARS                           $50,000

                  MISC0003          MISC ISDN Enhancements                      No Charge

                  Nl000003          NlO DPN Support                             $10,000

                  Nl000004          NIODWS                                      See Note         The fee is $50,000 plus
                                                                                                 $11,500 per DWS Access link.

                  Nl000028          NlO DWS Carrier Acc                         $50,000

                  Nl000027          NlO DWS Flexible Acc                        $71,500

                  Nl000023          NlO Intertol ISUP & SS7                     $200,000

                  Nl000002          NlO DataSPAN                                See Note         The fee is $20,000 per LPP
                                                                                                 cabinet.

1,100             Nl000007          NlO ISDN BASE                               See Note         The fee is $68,500 plus $500
                                                                                                 per 100 ISDN Unes plus $250
                                                                                                 for each 2B+D line and $100
                                                                                                 for each 1B+D line

L                 Nl000022          NlO ISDN PRI BASE                           See Note         The fee is $30,000 plus $2,000
                                                                                                 per PRI link.

                  Nl000025          Nl0 Nl-1 PRI CLG SCRN                       $15,000

                  Nl000050          Nl0 Nl 2/3 BRI Svcs Ph I                    See Note         The fee is $140 per ISDN BRI
                                                                                                 line.

L                 Nl000009          Nl0 Nl-1 BRI Enhancd Mtc                    $68,000

1,100             Nl000008          Nl0 Nl-1 BRI                                See Note         The fee is $251,000 per switch
                                                                                                 plus $7,200 per each increment
                                                                                                 of 480 lines.

                  Nl000013          Nl0 Nl-1 PRI Ntwrkng                        See Note         The fee is $25,000 plus $3,750
                                                                                                 per PRl-Link. This
                                                                                                 functionality can be added on a
                                                                                                 per link basis.

                  Nl000012          Nl0 Nl-1 PRI i/w 4E/5ESS                    $50,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


L                 Nl000011          Nl0 Nl-1 PRI                                See Note         The fee is $66,500 plus $3,000
                                                                                                 per Nl0 Nl-1 PRl_Link. This
                                                                                                 Functionality can be added on
                                                                                                 a per link basis.

2                 Nl000010          Nl0 Nl-1 Packet                             See Note         The license fee is $75,000
NTFX10's                                                                                         includes 2: NTFX10's (x.25
100 D                                                                                            and/or x.75 protocols), plus
10 B                                                                                             100 'D' and 10 'B' terminals.
                                                                                                 An additional $35,000 per NTFX10,
                                                                                                 plus a license fee of $8,000 per
                                                                                                 100 'D' and $5,000 per 10 'B"
                                                                                                 terminals

                  Nl000014          Nl0 Nl-1 Tandem                             $60,000

                  Nl000015          Nl0 Nl-2 PRI Base Vrt                       See Note         The fee is $55,000 plus $2,000
                                                                                                 per existing PRl_Link and
                                                                                                 $7,000 per added PRl_Link.

                  Nl000017          Nl0 Call by Call Nl-2                       See Note         The fee is $2,000 per Call by
                                                                                                 Call PRl_Link. This
                                                                                                 functionality can be added on a
                                                                                                 per link basis.

                  Nl000016          Nl0 D ch Backup Nl-2                        See Note         The fee is $30,000 plus $500
                                                                                                 per PRl_Link.

                  Nl000051          Nl0 Nl-2/3 BRI Svs Ph II                    See Note         The fee is $140 per ISDN BRI
                                                                                                 line.

                  RES00001          RES Access Management                       $8,000

                  RES00043          RES Ntwk Suprsd Ringing                     $25,000

                  RES00052          RES Office Convrsn Enhmnt                   $15,000          

                  RES00010          RES Telemetry Applic                        See Note         The fee is $30,000 plus $5,000  
                                                                                                 per utility telemetry trunk.     

                  RES00012          RES Univ Acc to 3WC                         $75,000

                  RES00011          RESUnivAcc to CLASS                         See Note         The fee is $169,500 for the
                                                                                                 first 5000 equipped lines plus
                                                                                                 $90,000 for each additional
                                                                                                 5000 equipped lines over the
                                                                                                 first 5000.
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  RES00002          RES Advncd Cstm Calling                     See Note         The fee is $15,000 for the first
                                                                                                 100 Advanced Custom Calling
                                                                                                 featured lines plus $2,500 for
                                                                                                 each additional 100 featured
                                                                                                 lines. This capability is sold in
                                                                                                 increments of 100 featured
                                                                                                 lines.

                  RES00018          RES & MDC Warm Line                         $5,000

                  RES00077          RES Access to Messaging                     See Note         The fee is $12,000 per 5,000
                                                                                                 Equipped Lines. The fee is
                                                                                                 $6,000 per 5,000 Equipped
                                                                                                 Lines if MSA00006 or
                                                                                                 RES00076 have been
                                                                                                 previously or concurrently
                                                                                                 licensed.

                  RES00074          RES CFW Fraud Prevention                    $12,000

                  RES00019          RES Call FWD Remote Act                     $27,000

                  RES00047          RES Call Screening                          $20,000

                  RES00014          RES Call Wake Up Svc                        $15,000

                  RES00054          RES EXB Simpified S`vOrd                    $7,500

                  RES00053          RES Enhanced CSMI                           $10,000

                  RES00016          RES Expansion Svcs                          See Note         The fee is $20,000 for the first
                                                                                                 100 Single Line Variety pack
                                                                                                 featured lines plus $1,500 for
                                                                                                 each additional 100 featured
                                                                                                 lines over the first 100 featured
                                                                                                 lines. This capability is sold in
                                                                                                 increments of 100 featured
                                                                                                 lines.

                  RES00013          RES Ext Bridged Svcs                        $7,500

                  RES00078          RES Fax-Thru Service                        See Note         The fee is $12,000 per switch.
                                                                                                 The fee is No Charge if
                                                                                                 MSA00005 has been
                                                                                                 previously licensed unless
                                                                                                 additional equipped lines are
                                                                                                 added.
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  RES00059          RESLDA Enhancements                         See Note         The fee is $15,000 per 5,000
                                                                                                 equipped lines not to exceed
                                                                                                 $60,000 per switch. If
                                                                                                 RES00038 has been previously
                                                                                                 purchased, there is no charge
                                                                                                 for RES00059.

                  RES00070          RES Remote Message Ind                      $12,000

                  RES00037          RES Sbscr Prgmbl Rng Ctl                    $13,000

                  RES00015          RES Sub Act Code Biking                     $20,000

                  RES00017          RES Teen Service                            See Note         The fee is $11,500 for the first
                                                                                                 100 Teen lines plus $1,500 for
                                                                                                 each additional 100 Teen lines
                                                                                                 over the first 100.

                  RES00060          RES Use Sensitive Cal Fwd                   See Note         The fee is $12,000 per 5,000
                                                                                                 equipped lines.

100               RES00003          RES Disp Funct &Prvcy                       See Note         The fee is $30,000 for the first
                                                                                                 100 Call Number Display and
                                                                                                 Blocking featured lines plus
                                                                                                 $1,500 for each additional 100
                                                                                                 featured lines over the first 100
                                                                                                 featured lines. This capability
                                                                                                 is sold in blocks of 100
                                                                                                 featured lines.

                  RES00021          RES Anonym Caller Rej                       $30,000

100               RES00023          RES Call Nm Disp SW/TCAP                    See Note         The fee is $20,000 for the first
                                                                                                 100 Calling Name Displayed
                                                                                                 featured lines plus $3,000 for
                                                                                                 each additional 100 featured
                                                                                                 lines over the first 100.  This
                                                                                                 capability is sold in increments
                                                                                                 of 100 featured lines.

                  RES00025          RES Call Waiting Display                    See Note         The fee is $15,000 for the first
                                                                                                 5000 EQUIPPED lines plus
                                                                                                 $15,000 for each additional
                                                                                                 5000 EQUIPPED lines over the
                                                                                                 first 5000. This capability is
                                                                                                 sold in increments of 5,000
                                                                                                 equipped lines.
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  RES00040          RES Call Wtg Delux [TR]                     See Note         The fee is $20,000 for the first
                                                                                                 5,000 lines plus $20,000 for
                                                                                                 each additional 5,000 lines
                                                                                                 over the first 5,000. If
                                                                                                 RES00026 is licensed the fee is
                                                                                                 $10,000 for the first 5,000
                                                                                                 lines plus $10,000 for each
                                                                                                 additional 5,000 lines over the
                                                                                                 first 5,000.

L                 RES00022          RES Calling Na Del Blkng                    $8,000

                  RES00024          RES VSLE & Call Logging                     $50,000

                  RES00027          RES Visual Msg Waiting                      $10,000

L                 RES00004          RES MDC Voice Mail                          $35,000

                  RES00023          RES Bulk Call Line ID                       See Note         The fee is $20,000 for the first
                                                                                                 50 data links plus $10,000 for
                                                                                                 each additional 25 links over
                                                                                                 the first 50.

                  RES00020          RES Rem Call Fwd Enh                        $12,500

                  RES00039          RES SMDI CLID Suppr                         $12,000

                  RES00005          RES Non-Display Services                    See Note         The fee is $15,000 for the first
                                                                                                 100 Non-Display Service
                                                                                                 featured lines plus $1,500 for
                                                                                                 each additional 100 featured
                                                                                                 lines over the first 100 featured
                                                                                                 lines. This feature is sold in
                                                                                                 increments of 100 featured
                                                                                                 lines.

                  RES00029          RES Auto Recall                             $5,000

                  RES00036          RES Auto-Recall Blocking                    See Note         The fee is $1.00 (Net Price -
                                                                                                 not subject to any discount) per
                                                                                                 wired line.

                  RES00031          RES Cust Tracing Enh                        $3,500

                  RES00030          RES Customer Tracing                        $3,500
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  RES00034          RES Dist Ring Call Wtg                      See Note         The fee is $10,000 for the first
                                                                                                 100 Distinctive Ring Call
                                                                                                 Waiting featured lines plus
                                                                                                 $1,500 for each additional 100
                                                                                                 featured lines over the first 100
                                                                                                 featured lines. This capability
                                                                                                 is sold in increments of 100
                                                                                                 featured lines.

                  RES00076          RES Enh Busy Call Retum                     See Note         The fee is $14,000 per 5,000
                                                                                                 Equipped Lines. Replaces
                                                                                                 MSA00001 which has been
                                                                                                 MD'd.

                  RES00073          RES SLE/ACBAR NO TCAP                       $10,000

                  RES00035          RES Select Call Accept                      See Note         The fee is $3,000 for the first
                                                                                                 100 SCA lines plus $3,000 for
                                                                                                 each additional 100 SCA lines
                                                                                                 over the first 100.

                  RES00032          RES Selective Call Fwd                      See Note         The fee is $10,000 for the first
                                                                                                 100 Selective Call Forwarding
                                                                                                 featured lines plus $1,500 for
                                                                                                 each additional 100 featured
                                                                                                 lines lines over the first 100
                                                                                                 featured lines. This capability
                                                                                                 is sold in increments of 100
                                                                                                 featured lines.

                  RES00033          RES Selective Call Rej                      See Note         The fee is $10,000 for the first
                                                                                                 100 Selective Call Rejection
                                                                                                 featured lines plus $1,500 for
                                                                                                 each additional 100 featured
                                                                                                 lines over the first 100 featured
                                                                                                 lines. This capability is sold in
                                                                                                 increments of 100 featured
                                                                                                 lines.

L                 RES00006          RES Service Enablers                        $31,000

                  RES00007          RES Signing Routng OAM                      $20,000

                  SAID0001          SAID Essentials                             $100,000

                  SAID0003          SAID ESP                                    $60,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  SAID0005          SAID ESP Phase 2                            $15,000

                  SAID0002          SAID Plus                                   $30,000

                  SAID0004          SAID Universal                              $60,000

                  SERV0001          SERVSERVORD                                 No Charge
                                    Enhancements

L                 WLC00001          WLC Enhanced                                $25,000

                  WLC00004          WLC 40mA current limit                      $5,000

                  WLC00002          WLC Line Admin                              $20,000

                  AIN00010          AIN Default Routing                         $65,000

                  AIN00018          AIN ACB/AR Premium                          $5,000

                  AIN00006          AIN Call Management                         $200,000

                  AIN00007          AIN Call Model Cntrl                        $190,000

                  AIN00008          AIN Display Services                        $130,000

                  AIN00022          AIN Maint Enhancements                      $22,000

                  AIN00026          AIN Transitns Simplifctn                    $15,000

                  AIN00015          AIN Ntwk Srvcs Enhncmnts                    $45,000

                  AIN00027          AIN Office Trigger Flex                     $15,000

                  AIN00011          AIN SSP Svcs Enhcemnts                      $40,000

                  AIN00220          AIN Service Enablers R2                     See Note         Option 1: $44,000 (List) plus
                                                                                                 $.005 (Net) per each Call
                                                                                                 Related Office or Subscription
                                                                                                 Msg with a msg fee cap of
                                                                                                 $344,000 (Net). Option 2: One
                                                                                                 time RTU fee of $312,000
                                                                                                 (List)

                  AIN00210          AIN Service Enablers                        See Note         Option 1: $22,000 (List) plus
                                                                                                 $.005 (Net) per each Call
                                                                                                 Related Office Msg with a msg
                                                                                                 fee cap of $144,000 (Net).
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                                                                                                 Option 2: One time RTU fee of
                                                                                                 $1 31,000 (List)

                  AIN00009          AIN Services Supporting                     $50,000

                  BAS00015          BAS RSC-S Sync                              $30,000

                  BAS00016          BAS SCM/SMS/SMU                             $11,000

                  BAS00027          BAS SCM-SLC96 Spec Svcs                     $12,000

                  CDD00004          CDD Trnk Grp Mem Usage                      $22,500

L                 LNP00100          LNPLRN                                      $125,000

                  LNP00101          LNPQoR                                      See Note         The fee is $120,000 per switch.
                                                                                                 If purchased coincidentally
                                                                                                 with LRN (LNP00100) for
                                                                                                 network-wide deployment, the
                                                                                                 fee is $70,000 per switch.

                  LOC00010          LOC Expand POSNAME                          $11,400
                                    Table

                  LOC00004          LOC Intl 15-Dgt Dial                        $75,000          
                                                                                                 
                  Nl000024          Nl0 RLT on Nl-1 PRI                         See Note         The fee is $12,000 per office plus
                                                                                                 $1,000 per PRI link.

                  NTS00022          NTS 800 Expand - 822 Cod                    $10,000

                  NTS00021          NTS 800 Expand - 833 Cod                    $10,000

                  NTS00020          NTS 800 Expand - 844 Cod                    $10,000

                  NTS00019          NTS 800 Expand - 855 Cod                    $10,000

                  NTS00018          NTS 800 Expand - 866 Cod                    $10,000

                  NTS00017          NTS 800 Expand - 877 Cod                    $10,000

L                 NTS00023          NTS 800 Expand - 888 Cod                    $50,000

                  NTS00016          NTS 888 Expansion for AT                    $100,000

L                 NTS00005          NTS E800-US                                 $60,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  NTS00012          NTS Extended Capability                     $15,000

                  OAM00004          OAM EADAS DC and                            No Charge
                                    HW Inv

                  OAM00007          OAM Enhanced E/DC Buffer                    $6,900

                  OAM00005          OAM EADAS NM l/f                            No Charge

                  SMA00012          SMA SMA2 with ICB                           See Note         The fee is $71,420 per SMA2
                                                                                                 for the 1st through 3rd SMA2
                                                                                                 per site.  There is No Charge
                                                                                                 beyond the 3rd SMA2 at the
                                                                                                 same site.

                  SMA00007          SMA PLATFORM                                No Charge
                                    ENHANCEMENT

                  SMA00001          SMA TR303 I/F                               See Note         The fee is $50,000 per SMA or
                                                                                                 SMA2/SMA2 module.

                  SMA00002          SMA MBS/TR303 Access                        $67,500

                  SMA00010          SMA RDT Refresh                             $6,500

L                 UDD00001          UDD Services                                $9,200

L                 TEL00001          TEL Telecom Layer                           See Note         The office license fee is:
                                                                                                 Local:$217,500; Toll:$162,300
                                                                                                 Local/Toll:$1 98,200;
                                                                                                 Toll/TOPS:$162,300;
                                                                                                 Local/Toll/TOPS:$198,200;
                                                                                                 STP:$25,000; LD:$159,000;
                                                                                                 Local/Toll/TOPS/LD:$214,100;
                                                                                                 GSP:$162,300;
                                                                                                 GWY:$270,000;
                                                                                                 LD/GWY:$270,000

                                                                                                 1. Toll and Local/Toll offices:
                                                                                                 $15,000 per group of 500 wired Toll
                                                                                                 trunks in the office. The total
                                                                                                 incremental fee for such wired
                                                                                                 trunks will not exceed a total of
                                                                                                 $741,300.
                                                                                               
                                                                                                         
                                                                                                 2. ENET: the fee is $6.00 per
                                                                                                 channel for the first 3,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 
 

                                                                                                 channels and $28.00 per each
                                                                                                 channel over 3,000.
                                                                                        
                                                                                                 3. DAT: the fee is $20,000 for
                                                                                                 the first occurance of
                                                                                                 NT9X9OBA.

                                                                                                
                                                                                                 4. LPP: the fee is $200,000 for the
                                                                                                 first occurance of NT9X70_. The fee
                                                                                                 is $75,000 if NTEX01_ or NT9X7204
                                                                                                 and NT9X01MB have been previously
                                                                                                 purchased. The fee is $75,000 if
                                                                                                 TEL00008 or Nl000010 have been
                                                                                                 previously or is concurrently
                                                                                                 licensed.
                                                                                               
                                                                                                 5. FLIS: the fee is $125,000 for
                                                                                                 the first occurance of NTEX01_. The
                                                                                                 fee is no charge if NT9X7204 and
                                                                                                 NT9X01MB have been previously or
                                                                                                 are concurrently purchased.
                                                                                                                             
                                                                                                 6. SNSE LIS: the fee is $125,000 if
                                                                                                 NT9X7204 and NT9X01MB are purchased
                                                                                                 concurrently for the first time.
                                                                                                 The fee is $50,000 if TEL00008 is
                                                                                                 concurrently licensed.
                                                                                               
                                                                                                 7. Channelized access: the fee is
                                                                                                 $20,000 for the first occurance of
                                                                                                 NTEX28_. The fee is no charge if
                                                                                                 Nl000010 is concurrently licensed.

                                                                                                 8. Ethernet: the fee is $90,000 for
                                                                                                 the first occurance of N9X84_. The
                                                                                                 fee is $55,000 if STPM0001 is
                                                                                                 concurrently licensed. The fee is
                                                                                                 $13,750 if NTRX70_ is concurrently
                                                                                                 purchased. The fee is no 
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                                                                                                 charge if
                                                                                                 DMS mail is concurrently licensed.
                                                                                        
L                 TEL00002          TEL C7 Chan-lized Access                    $30,000

                  TEL00007          TEL C7 Link Flt. Locator                    $90,000

                  TEL00006          TEL C7 Link Prot. Tester                    $36,000

                  TELOOOO9          TEL C7 Network Integrity                    $76,000
                                    Items

                  TEL00004          TEL C7 Routset Increment                    See Note         The fee is no charge for the
                                                                                                 first 256 Route Sets. The fee is
                                                                                                 $200,000 for the second group
                                                                                                 of 256 Route Sets plus $25,000
                                                                                                 for each additional group of
                                                                                                 256 Route Sets.

L                 TEL00008          TELCCS7 Base                                $400,000         The fee is $125,000 if
                                                                                                 STPB0001 has been or is
                                                                                                 concurrently licensed.

                  TEL00003          TEL Gateway Screening                       $120,000

                  CAIN0001          CAIN Base                                   No Charge

                  CAIN0500          CAIN CUSTDP Trigger                         $100,000

                  CAIN0600          CAIN Con Digit Collect                      $125,000

                  CAIN0602          CAIN EDPs                                   $50,000

                  CAIN0200          CAIN Extension Parms                        $50,000

                  CAIN0605          CAIN Global IMT Support                     $125,OO0

                  CAIN0604          CAIN Inter IMT Support                      $125,000

                  CAIN0700          CAIN LNP QOO                                $125,000

                  CAIN0100          CAIN Messages                               No Charge

                  CAIN0506          CAIN NETBUSY Trigger                        $100,000

                  CAIN0507          CAIN OCLDBUSY Trigger                       $100,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  CAIN0502          CAIN OFFHKIM Trigger                        $100,000

                  CAIN0508          CAIN OFTRREQ Trigger                        $100,000

                  CAIN0505          CAIN ONOANSWER Trigger                      $100,000

                  CAIN0504          CAIN PRIBCHNLTrigger                        $100,000

                  CAIN0300          CAIN SCP Simulator                          $30,000

                  CAIN0601          CAIN SCP Trigger Sub                        $50,000

                  CAIN0503          CAIN SlOTRKTrigger                          $100,000

                  CAIN0501          CAIN SPECDIG Trigger                        $100,000

                  CAIN0603          CAIN STR Connection                         $50,000

                  CAIN0400          CAIN Test Query Tool                        $30,000

                  CRDS0001          CRDS Card Services                          $120,000

                  CRDS0004          CRDS CLG/CLD Number                         $15,000
                                    Query

                  CRDS0003          CRDS MVP Card Services                      $50,000

                  CRDS0002          CRDS TCAP Card Services                     $25,000

                  EOPS0001          EOPS EOPS Base                              S100,000

                  NOOR0100          NOO Routing Base                            No Charge

                  NOOR0001          NOOR NOO Routing                            $100,000

                  NOOR0002          NOOR NOOINXX TCAP                           $125,000
                                    SERVICE

                  NPRI0001          NPRI PRI Netwk Interface                    $25,000

                  NSER0003          NSER Inter/lntra IMT                        $50,000

                  NSER0001          NSER Network Services                       $100,000

                  NSER0002          NSER TCAP Auth 8                            $20,000
                                    & Acct Val
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  PRLT0001          PRLT ISDN PRI RLT                           $175,000

                  UBFR0100          UBFR0 Bill and Fraud                        No Charge

                  UBFR0001          UBFR0 Flexible CDR                          $20,000

                  UCSB0001          UCSB UCS Base                               $286,700

                  UDWS0001          UDWS UCS DialableWidebnd                    $175,000

                  UOAM0100          UOAM UCS OAM Base                           No Charge

                  URLT0001          URLT0 SS7 RLT Base                          See Note         The fee is $50,000. This
                                                                                                 feature replaces ENSR0001
                                                                                                 which has been MD'd in
                                                                                                 UCS06, if ENSR0001 is
                                                                                                 currently licensed then
                                                                                                 URLT0001 is No Charge.

                  URLT0003          URLT0 Nonzero SS7 RLT                       See Note         The fee is $35,000. This
                                                                                                 feature replaces ENSR0003
                                                                                                 which has been MD'd in
                                                                                                 UCS06, if ENSR0003 is
                                                                                                 currently licensed then
                                                                                                 URLT0003 is No Charge.

                  URLT0004          URLT0 SS7 RLT Billing Enh                   $50,000

                  URLT0002          URLT0 SS7 RLT Enh Reorig                    See Note         The fee is $75,000. This
                                                                                                 feature replaces ENSR0002
                                                                                                 which has been MD'd in
                                                                                                 UCS06, if ENSR0002 is
                                                                                                 currently licensed then
                                                                                                 URLT0002 is No Charge.

                  UTRS0100          UTRS Base                                   No Charge

                  UTRS0004          UTRS COS Screening Enh                      $50,000

                  UTRS0002          UTRS Flexible Dial Plans                    $75,000

                  UTRS0003          UTRS Routing Enh I                          $25,000

                  UTRS0001          UTRS UCS Trans & Rout                       $90,000

                  DCR00001          DCRDCR                                      See Note         One-time network software
                                                                                                 license fee of $200,000 plus a
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                                                                                                 per switch license fee of
                                                                                                 $50,000

                  DCR00003          DCR Dual X25 link                           See Note         One-time network software
                                                                                                 license fee of $20,000 plus a
                                                                                                 per switch license fee of
                                                                                                 $3,000

                  DCR00002          DCR Mult. Net. Access                       $75,000

                  DCR00004          DCR Univrsal Translation                    $16,000

                  ISP70001          ISP7 Base ISUP                              $83,000

                  ISP70003          ISP7 Aut Cngst Cntrls                       $25,000

                  ISP70002          ISP7 Hop Counter                            $46,000

                  ISP70004          ISP7 TFP/TFC Rtng Opts                      $15,000

                  OSEA0001          OSEA TOPS Equal Access                      $72,000

                  OSEA0003          OSEA Exc Acc Opr Svc Sig                    $12,000

                  OSEA0005          OSEA GR317/394                              $160,000
                                    ISUP/TOPS

                  OSEA0007          OSEA TOPS Carrier RLT                       $75,000

                  OSEA0006          OSEA TOPS ILP via OLNS                      $75,000

                  OSEA0004          OSEA TOPS Incom FGD Sig                     $87,500

                  OSEA0002          OSEA TOPS InterLATA Carr                    See Note         The fee is $150,000 plus
                                                                                                 $20,000 for each group of
                                                                                                 10,000 Directory numbers. The
                                                                                                 fee for the first 50,000
                                                                                                 Directory numbers is included
                                                                                                 in the $150,000 list price.

                  OSEA0008          OSEA TOPS LNP                               $350,000

                  ABS00001          ABS Atternate Bill Serv                     $425,000

                  ABS00006          ABS AABS Call Screening                     No Charge

                  ABS00011          ABS AABS Enh Srvcs Acc                      $263,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 



                  ABS00004          ABS Account Code Billing                    $80,000

                  ABS00002          ABS Auto Altr Billing Svc                   $750,000

                  ABS00014          ABS Disallowed Card Issue                   $100,000

                  ABS00005          ABS French/English AABS                     No Charge

                  ABS00003          ABS Op Hand-off to MBS                      $250,000

                  ABS00013          ABS TOPS Auth Code Billng                   $96,000

                  ABS00008          ABS TOPS Com Cre Card                       $125,000
                                    Spt

                  ABS00007          ABS TOPS DN Call Scming                     $60,000

                  ABS00012          ABS TOPS OLNS Interface                     $200,000

                  ADVQ0001          ADVQ Advanced Queueing                      No Charge

                  ADVQ0005          ADVQ H/R Nwk by QueType                     $150,000

                  ADVQ0003          ADVQ Host Que Mgmt Sys                      See Note         The fee is $55,000 for the first
                                                                                                 15 queues plus $50,000 for
                                                                                                 each group of 10 queues over
                                                                                                 the first 15 queues.

                  ADVQ0006          ADVQ QMS Cust Service                       $50,000
                                    Enh

                  ADVQ0004          ADVQ Rem QueMgmtSys                         See Note         The fee is $25,000 for the first
                                                                                                 15 queues plus $25,000 for
                                                                                                 each group of 10 queues over
                                                                                                 the first 15 queues.

                  ADVQ0002          ADVQ TOPS Close Down                        $25,000

                  ENSV0001          ENSV Enhanced Services                      No Charge

                  ENSV0011          ENSV Enh OC-lncr Rem Supt                   $25,000

                  ENSV0006          ENSV 2 Digit ANT-TOPS                       $25,000
                                    Off

                  ENSV0002          ENSV Auto Coin Toll Serv                    $60,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 



                  ENSV0010          ENSV Auto Country Direct                    $150,000

                  ENSV0017          ENSV Branding via SPID                      $80,000

                  ENSV0008          ENSV Enh TOPS OperCentra                    $50,000

                  ENSV0018          ENSV Est Call Charges                       $30,000

                  ENSV0005          ENSV Ext Aud Rep                            $20,000
                                    Host&Rem

                  ENSV0009          ENSV Externl RTRS Intrfce                   $170,000

                  ENSV0014          ENSV Operator Srvcs AIN                     See Note         The fee is $65,000 plus $2.00
                                                                                                 per 1,000 messages.

                  ENSV0007          ENSV Pre Paid Coin                          $88,000

                  ENSV0004          ENSV Screened Serv Rout                     $70,400

                  ENSV0003          ENSV TOPS Alternate Ann                     $5,000

                  ENSV0013          MDS- Offer of Service                       See Note         The fee of $295,000 applies to
                                                                                                 host Prompt TOPS switches
                                                                                                 physically connnected to
                                                                                                 Audiogram Delivery Service
                                                                                                 node(s). TOPS switches not
                                                                                                 physically connected to ADS
                                                                                                 will be No Charge.

                  EWSS0001          EWSS Enhancd W/S                            $50,000
                                    Software

                  EWSS0002          EWSS Auto OIA Sess Start                    $30,000

                  EWSS0006          EWSS TMS Networking                         See Note         The fee is $15,000 for 0-96
                                                                                                 positions.

                  EWSS0007          EWSS TMS Proc Upgrade                       See Note         The fee is $10,000 for 0-96
                                                                                                 positions.

                  EWSS0003          EWSS TOPS DASubtenTMS                       See Note         The fee is $90,000 per 96
                                                                                                 positions.  The fee is no charge
                                                                                                 if NTXJ67AA or NTXA83AA
                                                                                                 have been previously licensed.

                  EWSS0005          EWSS TOPS Incr Multiplex                    $116,000
</TABLE>
<PAGE>
 
<TABLE> 
<CAPTION> 

License           Order             ProductName                                 List Price       Pricing Notes
- -------           -----             -----------                                 ----------       -------------
Status            Code
- ------            ----
<S>               <C>               <C>                                         <C>              <C> 


                  EWSS0004          EWSS TOPS Open PosProt                      See Note         The fee is $150,000 for the
                                                                                                 first 100 positions plus $1,500
                                                                                                 for each additional position
                                                                                                 over the first 100.

                  OSB00001          OSB Oper Services Basic                     $151,200         This is a Net Price not subject
                                                                                                 to any discounts. The fee is no
                                                                                                 charge for extension offices.

                  OSDA0001          OSDA Directory Assistance                   See Note         The fee is $150,000 plus
                                                                                                 $2,000 per TOPS position.

                  OSDA0004          OSDA Auto DA Srvc                           $550,000
                                    (ADAS)

                  OSDA0002          OSDA Auto DACC w/AltBill                    $215,000

                  OSDA0003          OSDA Auto Int Call Comp                     $400,000

                  OSDA0005          OSDA Cell/lXC/LEC ADACC                     $325,000

                  OSDA0006          OSDA DA Automation l/F                      $400,000

                  OSDA0008          OSDA LPP/APU Support                        $20,000
</TABLE> 
<PAGE>
 
                                  Schedule A
                          Part IV. DMS-500 Extensions
                               (DMS-500 System)

DMS-500 Extension Pricing

1.0  DTCVDTC7 Port Extension Pricing

     1.1  DTCVDTC7 Port Extension Pricing

          The DTCI provides DS-1 interconnect for ISDN PRI or MF Trunking. The
          DTC7 provides DS-1 interconnect for SS7 or MF bunking. Each DTCI/DTC7
          Port Extension is configured in minimum increments of nine hundred
          sixty (960) ports, and is configured for SS7 or ISDN signaling at
          FOCAL's request. The price for the DTCI/DTC7 Port Extensions includes
          the following

          a.)  DTCI/DTC7 Equipment and XPM;

          b.)  Either UTR, STR, CTD as required for DTCs configured for SS7, or
               UTR and ISDN pre-processor circuit pack configured for ISDN PRI
               capability;

          c.)  Any required ENET, MS;

          d.)  Any required DMS-500 service/test circuits to support the
               DTCI/DTC7 Port Extensions;

          e.)  Power Distribution Center (PDC) equipment as required to support
               the DTEI Port Extensions;

          f.)  Spare circuit packs if required; and

          g.)  Wired ports contain all of the above except the DS-1 circuit
               packs.

     1.2  Initial Port Prices

          Additional DTC7/DTCI ports may be Ordered and Installed with the
          Initial System for the following listed prices:
<TABLE>     
<CAPTION>

                                         Minimum Port   Price per
          Description                      Increment      Port
          -----------                    ------------   ---------
          <S>                            <C>            <C>

          DTC7 ports Wired & Equipped         960         *____

          DTCI ports Wired & Equipped         960         *____
 
</TABLE>      
<PAGE>
 
     1.3  Extensions Port Prices

          The price for DTCI/DTC7 Port Extensions Ordered in minimum increments
          of 4800 ports over and above the initial configuration at any time
          other than with an Order for an Initial System, are as follows:

<TABLE>     
<CAPTION> 
                                              Minimum Port      Price per
          Description                         Increment         Port
          -----------                         ---------         ----
          <S>                                 <C>               <C> 
          DTC7 ports Wired & Equipped         4800              *___

          DTCI ports Wired & Equipped         4800              *___
</TABLE>      
    
          The price for DTCI/DTC7 Port Extensions Ordered in increments of 960
          up to 3840 ports over and above the initial configuration at any time
          other than with an Order for an Initial System are *____ per port. 
     

2.0  SMA2 Port Extension Pricing

     2.1  SMA2 Ports

          The SMA2 provides DS-1 interconnect for TR-303 interface. Each SMA2
          Port Extensions is configured in minimum increments of nine hundred
          sixty (960) ports. SMA2 is only available on DMS-100 and DMS-500
          systems. The price for an SMA2 Port Extensions includes the following:

          a)   SMA2 Equipment;

          b)   Any required ENET, MS;

          c)   Any required DMS-500 service/test circuits to support the SMA2
               Extensions;

          d)   Power Distribution Center (PDC) equipment as required to support
               the SMA2 Extensions;

          e)   Spare circuit packs if required; and

          f.)  Wired ports contain all of the above except the DS-1 circuit
               packs.

     2.2  Initial Port Prices

                                     - 2 -
<PAGE>
 
          Additional SMA2 ports may be Ordered and Installed with the Initial
          System at the following prices:

<TABLE>     
<CAPTION> 
                                              Minimum Port      Price per
          Description                         Increment         Port
          -----------                         ---------         ----
          <S>                                 <C>               <C> 
          SMA2 ports Wired & Equipped         960               *___
</TABLE>      

     2.3  Extension Port Prices

          Additional SMA2 ports may be Ordered in 1920 increments at any time
          other than with the Initial System for the following prices:
 
<TABLE>     
<CAPTION> 
                                              Minimum Port      Price per
          Description                         Increment         Port
          -----------                         --------          ----
          <S>                                 <C>               <C> 
          SMA2 ports Wired & Equipped         1920              *___

          SMA2 ports Wired & Equipped          960              *___
</TABLE>      
 
3.0  Link Peripheral Processor (LPP)

     3.1  Initial Channelized Access LIU 7 Interface Unit Pricing
    
          Additional Channelized Access LIU7 Interface Units may be Ordered and
          Installed with the Initial System for the price of *__________________
          per unit. Channelized Access LIU7 Interface Unit consists of the
          following:      
 
          Otv  PEC       Description
          ---  ---       -----------
 
          1    NTEX22BB  IPF Integrated Proc & FBUS
          1    NT9X76AA  STP- Signalling Terminator CP
          1    NTEX26AA  LUI Channel Bus I/F
          1    NT9X0193  STP Bulkhead Cable Assembly

     3.2  Extension Channelized Access LIU 7 Interface Unit Pricing
    
          Channelized Access LIU7 Interface Units may be Ordered at any time
          other than with an Initial System for the price of *__________________
          per unit. This price is for furnish only and does not include spares.
     
     3.3  Initial Ethernet Interface Unit Pricing

                                     - 3 -
<PAGE>
 
    
          Additional Ethernet Interface Units may be Ordered and Installed with
          the Initial System for the price of *____________________ per unit.
          Ethernet Interface Unit consists of the following:      

          Qty  PEC        Description
          ---  ---        -----------

          1    NTEX22BB   IPF Integrated Proc & FBUS
          1    NT9X84AA   Ethernet Interface Circuit Pack
          1    NT9X85AA   Ethernet Access Unit Interface PB
          1    NT9X0190   Ethernet Cable Assembly


     3.4  Extension Ethernet Interface Unit Pricing
    
          Ethernet Interface Units may be Ordered at any time other than with an
          Initial System for the price of *_________________________ per unit.
          This price is for furnish only and does not include spares.      

     3.5  Initial Frame Relay Interface Unit (FRIU) Pricing
    
          Additional Frame Relay Interface Units may be Ordered and Installed
          with the Initial System for the price of *____________________ per
          unit. Price does not include software. Frame Relay Interface Unit
          consists of the following:      
  
          Otv  PEC       Description
          ---  ---       -----------
 
          1    NTEX22BB  IPF Integrated Proc & FBUS
          1    NTEX30AA  Frame Relay T1 Access PB
          1    NTEX31BA  Frame Enhanced Relay Access Proc CP
          2    NT9X0191  FRIU Cable Assembly
 

     3.6  Extension Frame Relay Interface Unit (FRIU) Pricing
    
          Frame Relay Interface Units may be Ordered at any time other than with
          an Initial System for the price of *_______________________ per unit.
          This price is for furnish only. Pricing does not include spares or
          software.      

     3.7  Initial Packet Handler (XLIU) Pricing
    
          Additional Packet Handlers may be Ordered and Installed with the
          Initial System for the price of *_______________________ per unit.
          Price does not include software. Packet Handler consists of the
          following:      

                                     - 4 -
<PAGE>
 
          Oty    PEC       Description
          ---    ---       -----------
 
          1      NTEX22BB  IPF Integrated Proc & FBUS
          1      NTFX09AA  CBUS Interface PB
          1      NTFX1OAA  HDLC Frame Processor CP

     3.8  Extension Packet Handler (XLIU) Pricing
    
          Packet Handler may be Ordered at any time other than with an Initial
          System for the price of *____________________ per unit. This price is
          for furnish only. Pricing does not include spares or software.      

     3.9  Initial Network Interface Unit (NIU) Pricing
    
          Additional Network Interface Units may be Ordered and Installed with
          the Initial System for the price of *______________________ per unit.
          Network Interface Unit consists of the following:      
 
          Qty  PEC       Description
          ---  ---       -----------
 
          2    NTEX22BB  IPF Integrated Proc & FBUS
          1    NTEX25AA  Channel Bus Control Unit
          1    NTEX25BA  Channel Bus Control Unit
          2    NTEX28AA  DS30 Link Interface Unit
          4    NT9X7020  Cable Assemblies
          2    NT9X7021  NIU Inter CBC Cable

     4.10 Extension Network Interface Unit (NIU) Pricing
    
          Network Interface Unit may be Ordered at any time other than with an
          Initial System for the price of *____________________ per unit. This
          price is for furnish only.      

                                     - 5 -

<PAGE>
 
                                                                   Exhibit 10.17
    
     *    Certain portions of this Exhibit have been omitted where indicated by
          an "*" pursuant to a request for confidential treatment, and the
          omitted portions have been separately filed with the Commission.     

License Agreement # LA97-10
- ---------------------------

Licensee: FOCAL Communications Corporation
- ------------------------------------------
          200 N. LaSalle Street
- ------------------------------------------
          Chicago, Illinois  60601
- ------------------------------------------

                               SOFTWARE LICENSE

DPI/TFS, INC. ("DPI") and the Licensee identified above ("Licensee") in
consideration of the grants and mutual covenants made in this License, agree as
follow:

1.   DEFINITIONS:

     1.1  "Software" means the Telco Friendly Software in executable format
identified in Exhibit 1 and any DPI modifications to that Software.

     1.2  "Modifications" means DPI improvements, enhancements, additions, and
new versions of Telco Friendly Software.

     1.3  "Software Package" means the Software, related documentation, and the
DPI DEMO LIB package, or any part thereof, as the context requires.

     1.4  "Module" refers to any one of the Software programs listed on Exhibit
1.

     1.5  "Access Line" means the facilities that provide access to local and
toll switched networks and are located between a customer and a serving central
office. An access line may include central-office equipment, a subscriber loop,
a drop line, inside wiring, and a jack. It may be a discrete entity, such as a
wire pair or a channel in a multiplex system.

2.   DPI'S GRANTS WARRANTIES AND OBLIGATIONS:

     2.1  License:  Subject to the terms and conditions of this License, DPI
grants to Licensee

     (a)  a personal, non-exclusive and non-transferable license to use the
          software Package for Licensee's own internal purposes as specified in
          Exhibit 4 and no others;

     (b)  a non-exclusive license to make a reasonable number of copies of the
          Software for back-up purposes only;

<PAGE>
 
     (c)  non-exclusive license to copy the documentation provided by DPI for
          Licensee's internal purposes only.

     2.2  DELIVERY: DPI shall deliver the Software Package according to the
schedule in Exhibit 2 or as otherwise agreed by both Parties. If DPI fails to
deliver the Software Package to Licensee after four (4) attempts to make
delivery, Licensee may request a refund and upon such request DPI shall
reimburse all amounts paid by Licensee to DPI under this License. This License
shall thereupon terminate without further obligation of the Parties except any
obligation arising out of a previous default.

     2.3  USE OF SOFTWARE:  Licensee recognizes and agrees that, with respect to
the use of the Software, it accepts full responsibility (1) for the selection of
the Software and (2) that the Software will meet its intended use.

     2.4  WARRANTY OF PERFORMANCE:  For ninety (90) days following initial
receipt of the Software, DPI warrants that the Software shall have the functions
and capabilities and shall perform as described in Exhibit 7, provided, however,
that any program errors in the Software shall not violate this Warranty of
Performance. This "Warranty of Performance" shall not apply to any Module that
has been modified by Licensee. The Warranty of Performance shall terminate
immediately upon the occurrence of any of the following:

     (a)  a material breach by Licensee of any term or condition of this
          License;

     (b)  misuse, neglect or abuse of the Software, attempts to repair the
          Software, or any other causes beyond the range of normal usage; or

     (c)  failure by Licensee to cooperate with and assist DPI in DPI's efforts
          to repair, modify, or replace the defective Module.

Licensee acknowledges that Modifications to the Software may affect the way in
which the Software works and may affect Licensee's operating procedures. DPI
shall not be liable in the event that any Modification does not conform to the
Warranty of Performance, and DPI shall not be liable for any changes in
Licensee's operating procedures necessitated or caused by Modifications.

In the event Licensee believes a breach of the Warranty of Performance has
occurred, Licensee must promptly provide written notification to DPI
specifically describing the alleged breach. Upon receipt of such notice, DPI
shall, at its option and with reasonable dispatch: issue discrepancy or error
correction information or deliver corrected Software or Modules to Licensee. If
after four (4) attempts to correct a particular defect, DPI is unable to repair,
replace, or modify the Software or Module(s), Licensee may return the Software
or Modules for a refund of the License Fees associated with the return. This
refund remedy shall be available only if DPI's examination of the Software
discloses that the breach of the Warranty of Performance actually exists and was
not caused by conditions beyond DPI's control, or by

                                      -2-

<PAGE>
 
Licensee's misuse, neglect, abuse, or attempts to repair, or any other cause
beyond the range of normal usage, or by accident, fire, or other hazard.
Licensee's remedies as set forth above are exclusive of any other remedy to
which Licensee may be entitled.

     2.5  WARRANTY:  DPI warrants that the Software does not infringe any United
States copyright or use any trade secret of any third party. DPI shall, at its
own expense, defend Licensee from any claim or action to the extent that such
claim is based upon infringement by the Software of such intellectual property
rights of a third party. DPI shall have the right to control the defense of all
such claims and actions. DPI shall have no obligation under this paragraph if
Licensee fails to notify DPI of the claim or action within ten (10) days after
receipt by Licensee of notice of the claim or action, or if Licensee fails to
notify DPI before offering to settle such claim or action. In the event that the
Software or any portion of the Software is judicially declared to be subject to
the intellectual property right of a third party, DPI shall, at its option: (1)
obtain permission or a right for Licensee to continue using the Software or the
portion of the Software affected; or (2) replace or modify the Software or
affected portion of the Software to render it non-infringing; or (3) remove the
Software or affected portion of the Software and refund to Licensee the License
Fee or the pro-rata portion of the License Fee paid to DPI.

     2.6  LIMITATION OF WARRANTIES:  DPI MAKES NO OTHER WARRANTY, EXPRESS OR
IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. DPI MAKES NO ASSURANCE OF SUCCESSFUL INSTALLATION OF THE SOFTWARE.
NEITHER DPI NOR ANY AFFILIATE OF DPI SHALL BE RESPONSIBLE TO LICENSEE, OR TO ANY
OF ITS AFFILIATES FOR LOST REVENUES, LOST PROFITS, LOST DATA OR OTHER SPECIAL,
INCIDENTAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR FOR LOSS OR DAMAGE OR
OTHER EXPENSE DIRECTLY OR INDIRECTLY ARISING FROM LICENSEE'S, OR ANY OTHER
PARTY'S USE OF OR INABILITY TO USE THE SOFTWARE OR FOR COMMERCIAL LOSS OF ANY
KIND; NOR SHALL ANY RECOVERY AGAINST DPI, WHETHER IN CONTRACT, TORT (INCLUDING
NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, BE GREATER THAN THE AMOUNTS PAID BY
LICENSEE HEREUNDER.

     2.7  REPLACEMENT COPIES:  If the Software is unintentionally lost or
damaged after delivery but before the initial installation, DPI will promptly
deliver a replacement copy to Licensee. Licensee will be billed for and shall
pay the applicable media, preparation, shipping and handling fees for such a
replacement.

     2.8  DATA CONVERSION:  DPI assumes no responsibility for data conversion.

                                      -3-

<PAGE>
 
3.   LICENSEE'S OBLIGATIONS:

     3.1  PAYMENTS TO DPI:

          3.1.1  License Use Fees:  Licensee shall pay License Use Fees to DPI
in the amounts and as provided in Exhibit 3. Such payments shall be in U.S.
dollars and paid at an address to be specified by DPI.

          3.1.2  Payment For Service Required By Licensee Error: Licensee shall
pay DPI, at DPI's applicable service rates, including time and material fees,
for all maintenance services and warranty services required because of, in DPI's
determination, Licensee error or Licensee modification of the Software.

          3.1.3  Taxes:  Licensee shall be liable for any and all U.S. federal,
state, local, foreign or other governmental taxes, duties, or excises now or
hereafter applied to the production, storage, sale, transportation, import,
export, licensing or use of the Software or to the services provided hereunder,
including any sales tax, value added tax or similar tax. Any taxes imposed by
U.S. federal, or any other state, local, foreign or municipal government, or any
amount in lieu thereof, including interest and penalties thereon, paid or
payable at any time by DPI in connection with DPI's grant of license to
Licensee, exclusive of taxes based on DPI's net income, shall be borne by
Licensee. Licensee's payment obligation hereunder shall be made without
withholding on account of any taxes, levies, duties or other deduction
whatsoever. In the event that Licensee is required by applicable law to withhold
or deduct any sum from payments required hereby, licensee shall increase the
amount paid to DPI by such withholdings or deductions as may be necessary so
that DPI shall receive an amount which after the payment of such withholdings or
deductions shall be equal to the amount DPI would have received had such sum not
been withheld or deducted.

     3.2  THE DESIGNATED HARDWARE TYPE:

     Restricted Use of The Software: Licensee shall use the Software as
specified in Exhibit 5.

     3.3  OBLIGATIONS TO PROTECT DPI'S PROPRIETARY RIGHTS:

          3.3.1  Confidential Information:  Licensee acknowledges that the
Software Package contains confidential information belonging to DPI and that
Licensee has no right to such confidential information except as expressly
provided in this License. Except as otherwise provided herein, Licensee shall
not copy, use, disclose, transmit, or commercially exploit, or allow anyone else
to copy, use, disclose, transmit, or commercially exploit any part of the
Software Package, including such confidential information, without prior express
written consent of an officer of DPI. Licensee shall keep all copies of the
Software Package including Modifications at its address identified in this
License, except for a backup copy which shall be located at the address shown
below. Licensee shall exercise all reasonable precautions to

                                      -4-

<PAGE>
 
prevent access to, use of, or copying of the Software Package, including DPI's
confidential information.

Location of backup copy:

          --------------------------------------
          --------------------------------------
          --------------------------------------

Licensee shall execute a non-disclosure agreement, as set forth in Exhibit 6,
with each employee who has access to the Software Package. Additionally, in the
event that any third party attempts to obtain access to the Software Package or
any of DPI's confidential information, Licensee shall immediately notify DPI, in
writing and either personally or by telephone, and Licensee shall cooperate with
DPI in any litigation against such third parties to prevent the recurrence of
such events.

          3.3.2  Liens:  Licensee shall not permit any lien or encumbrance of
any nature or description to attach to any part of the Software Package.

          3.3.3  Retention of Rights:  Licensee agrees that all patents,
copyrights, trademarks, and trade secrets in the Software Package shall be and
shall remain the sole and separate property of DPI. Licensee further agrees that
DPI is the owner of the Software Package and that Licensee's rights are limited
to those rights expressly provided in this License.

          3.3.4  Proprietary Notices:  Licensee shall not remove any copyright
notices or any other notices or disclosures from any part of the Software
Package.

          3.3.5  Non-Competition: Licensee shall not directly or indirectly
develop, sell, license, or lease to others, offer to sell, license, or lease to
others, any computer applications competitive with the Software which may
violate any copyright associated with the Software. Licensee shall not use any
part of the Software Package to develop computer applications competitive with
the Software.

          3.3.6  DPI's Copyright in the Software Package:  Licensee acknowledges
that DPI is the owner of the copyright in the Software the Software Package, and
any Modifications, improvements, and enhancements. Licensee will not under any
circumstances challenge in court or elsewhere DPI's ownership of such copyright,
the validity of any DPI copyright registration for the Software or the Software
Package, or the facts recited in any such registration. Licensee shall, at DPI's
option, return to DPI at DPI's expense, or destroy, all copies of the replaced
or defective portion of the Software Package. Licensee shall notify DPI that all
such copies have returned or destroyed.

                                      -5-

<PAGE>
 
     3.4  DUTY TO RETURN OR DESTROY COPIES:  Upon receipt and installation of a
replacement, upgrade, or corrected copy of any part of the Software Package as
provided under Sections 2.2 and 2.5 of this License, Licensee shall, at DPI's
option, return to DPI at DPI's expense, or destroy, all copies of the replaced
or defective portion of the Software Package. Licensee shall notify DPI that all
such copies have been returned or destroyed.

     3.5  AUDIT:  During reasonable business hours, DPI will have the right
periodically to inspect Licensee's premises to assure itself that Licensee is
complying with the confidentiality provisions of this Agreement and to verify
that appropriate non-disclosure agreements have been executed. DPI will have the
right to periodically inspect Licensee's system, either on premises or remotely
through telecommunications link, to confirm Licensee's compliance with the
provisions of this Agreement.

     3.6  GENERAL PROCEDURES:  Licensee understands that generally accepted data
processing procedures dictate that Licensee always keeps back-up copies of data
files and of program files. Licensee further understands that generally accepted
data processing procedures dictate that the existing version of the Software
should be run concurrently with an upgraded version of the Software during at
least the first month of operation with the upgraded version.

4.   EFFECTIVE DATE AND TERMINATION:

     4.1  EFFECTIVE DATE:  Licensee shall be effective when signed by both
Parties.

     4.2  TERM:  Subject to termination as set forth herein, or by a subsequent
written agreement of the parties, the term of this Licensee shall be perpetual.

     4.3  TERMINATION:  DPI may immediately terminate this License by giving
written notice to Licensee if Licensee violates any provisions of this License.
Licensee may terminate this Agreement for any reason on written notice to DPI
following expiration or fulfillment of Licensee's obligations.

     4.4  RIGHT TO POSSESSION OF SOFTWARE:  In the event of termination of this
License, DPI shall have the right to take and Licensee shall have the duty to
deliver the Software Package immediately to DPI and all copies wherever located,
without demand or notice so long as no breach of the peace occurs, and upon so
doing Licensee shall certify that it has so done and that it retains no copies
in its possession. DPI has the right to inspect Licensee's premises without
advance notice, but during business hours, to verify that Licensee has returned
the Software and all copies. This right to inspect continues for one year after
DPI terminates this License.

     4.5  CONTINUING DUTIES:  Licensee's obligations under Sections 3.3, 3.4,
and 5 shall survive the termination of this License.

                                      -6-

<PAGE>
 
     4.6  CONSEQUENCES OF TERMINATION:  In addition to the provisions of Section
4.4, upon termination, Licensee shall cease all use of the Software Package, and
all amounts payable to DPI shall become due and payable on demand.

5.   REMEDIES:

     5.1  LIMITATIONS OF DPI'S LIABILITY:  In connection with this License,
DPI's liability shall be limited to the total amount of payments received by DPI
from Licensee. With respect to any claim relating to the Software or this
License, the provisions of Section 2.6 shall be applicable, even if DPI has been
advised of the possibility of damages.

     5.2  INJUNCTIVE RELIEF:  In the event that Licensee breaches any term of
this License, DPI may obtain injunctive relief, an appropriate security bond,
and specific performance, in addition to any other relief available. Licensee
agrees to such injunction, security bond, and specific performance, and
acknowledges that other remedies are inadequate.

     5.3  LITIGATION COSTS AND EXPENSES:  In any action between the Parties
relating to this License, the court may award all or any part of the costs and
expenses relating to such action, including attorney's fees, as the court shall
deem just.

     5.4  CUMULATIVE REMEDIES:  Except as expressly provided herein, the
remedies available to either party under this License are cumulative and not
exclusive of any other remedies available.

6.   GENERAL PROVISIONS:

     6.1  ASSIGNMENT:  This License shall be binding upon the parties'
respective successors and permitted assignees. Licensee may not assign this
License or any rights or obligations under this License without the prior
written consent of DPI, and any such attempted assignment shall be void.

     6.2  EXCUSES FOR NON-PERFORMANCE:  DPI shall be excused for any delay or
failure to fulfill its obligations under this License due to causes beyond its
control, such as natural disasters, acts of government, labor strikes of other
entities, acts of war, civil disturbances, or court order.

     6.3  ENTIRE AGREEMENT:  This License, together with its Exhibits, contains
the entire understanding of the Parties and supersedes all prior written or
verbal agreements or representations. No change or waiver of any provision of
this License shall be valid unless in writing and signed by the party against
whom such change or waiver is sought to be enforced. Any signature required by
DPI must be that of an officer of DPI. No employee, agent, or representative of
either party has authority to bind such party by any oral representation or
warranty.

                                      -7-

<PAGE>
 
     6.4  SURVIVING CLAUSES:  If a court deems or declares invalid or
unenforceable any clause or provision of this License, all other terms and
provisions shall remain in full force and effect.

     6.5  WAIVER:  No delay or omission by DPI to exercise any right or power
under this License shall impair any such right or power or be construed as a
waiver.

     6.6  CLAUSE HEADINGS:  Clause headings are inserted for ease of reference
only and shall not be used in construing the meaning or effect of this
Agreement.

     6.7  CONTROLLING LAW AND PLACE OF SUIT:  This License shall be subject to
and shall be interpreted according to the laws of the State of Texas. The
Parties hereby subject themselves to the venue and jurisdiction of any
appropriate Court in Texas.

The Parties have caused this License to be executed by their duly authorized
representatives this 10th day of April, 1997.


DPI/TFS, Inc.

By:          /s/ Mark Giles
   ------------------------------------
Print Name:  Mark Giles
           ----------------------------
Title:       General Manager
      ---------------------------------
Date:        4/10/97
     ----------------------------------


LICENSEE

By:          /s/ Robert C. Taylor, Jr.
   ------------------------------------
Print Name:  Robert C. Taylor, Jr.
           ----------------------------
Title:       President
      ---------------------------------
Date:        4/9/97
     ----------------------------------

                                      -8-

<PAGE>
 
                               SOFTWARE LICENSE

                                   EXHIBIT 1
                                 THE SOFTWARE
                                (Paragraph 1.1)

================================================================================

MODULES:

Commercial Billing
Service Orders
General Plant Information
Trouble Reporting
WATS Billing & Rating
General Ledger
Payroll/Labor Distribution
Accounts Payable
Inventory
Work Orders
Continuing Property Records
Toll Center Rating
Carrier Access Billing
Data Base System Control Records
Dynamic Menu System

                                      -9-

<PAGE>
 
                               SOFTWARE LICENSE

                                   EXHIBIT 2
                               DELIVERY SCHEDULE
                                (Paragraph 2.2)

================================================================================

Items to be supplied will be shipped or delivered within five (5) days of
execution of this Agreement.

                                     -10-

<PAGE>
 
                                SOFTWARE LICENSE

                                   EXHIBIT 3
                          PAYMENT AMOUNTS AND SCHEDULE
                      (Paragraphs 3.1.1, 3.1.2, and 3.1.3)

================================================================================
    
1.  License Use Fees: * _________ . This License Use Fee has been calculated
based on * _________ Access Lines. This allows usage of the Software up to *____
Access Lines. Usage with more than *___ Access Lines will require the payment of
additional License Use Fees as shown below:       

     Access Line Levels       Incremental License       Use Fee
    
* Chart deleted       

The Incremental License Use Fees are valid for a period of three (3) years from
execution of this Agreement. After such time they are subject to change without
notice.
    
Any usage beyond *___ Access Lines is subject to the then current License Use
Fees in effect at the time.       
    
Licensee will submit to DPI, in writing, a certified and accurate count of its
total Access Lines as of the first day (January 1) of each year following the
execution date of this Agreement. Licensee shall submit such certified Access
Line count prior to January 31 of the same year. DPI shall invoice Licensee upon
receipt of the certified Access Line count for any additional License Use Fees
as applicable. Payment in respect of such additional License Use Fees shall be
made by Licensee within 30 (thirty) days of receipt of the invoice. Not
withstanding the foregoing, in the event Licensee's access line growth exceeds
*_______ prior to the January 1 date of any year, beginning with January 1,
1999, Licensee shall promptly notify DPI of the number of additional Access
Lines and shall make payment of any applicable additional License Use Fees to
DPI within thirty (30) days of such notification.       

2.   License Use Fee Payment Schedule
    
     a.   *______________________
     b.   *______________________
     c.   *______________________        


                                    - 11 -
<PAGE>
 
                                SOFTWARE LICENSE

                                   EXHIBIT 4
           BUSINESS FOR WHICH LICENSEE WILL USE THE SOFTWARE PACKAGE
                               (Paragraphs 2.1A)

================================================================================

               Focal Communications Corporation, Holding Company
                 Focal Communications Corporation of Illinois,
                            wholly owned subsidiary
              Focal Communications Corporation of Massachusetts,
                            wholly owned subsidiary
                 Focal Communications Corporation of New York,
                            wholly owned subsidiary
                Focal Communications Corporation of California
                            wholly owned subsidiary

Licensee may not use the Software to perform service bureau or data processing
services for any third party without the express written consent of an officer
of DPI.

                                    - 12 -
<PAGE>
 
                                SOFTWARE LICENSE

                                   EXHIBIT 5
                          THE DESIGNATED HARDWARE TYPE
                                (Paragraphs 3.2)

================================================================================

Hardware Type: IBM AS/400

                                      - 13 -
<PAGE>
 
                                SOFTWARE LICENSE

                                   EXHIBIT 6
                            NON-DISCLOSURE AGREEMENT
                                (Paragraphs 3.3)

================================================================================

__________________________ ("Employee") and _______________________ ("Employer")
and ("Employee") agree as follows:


1.   Agreed Facts

     1.1  Employer has the right to use certain software with related
documentation (the "DPI Software Package") from DPI/TFS, Inc. (hereinafter
referred to as "DPI").  The Software Package contains confidential information
and trade secrets belonging to DPI.

2.   Covenants of Employee.  In consideration of continued and future employment
with Employer, Employee agrees:

     2.1  Employee shall not copy, duplicate, create, or recreate all or any
part of the DPI Software Package, other than as required for Employer's normal
operations.

     2.2  Employee shall not assign, lease, sell, market, donate, or
commercially exploit all or any part of the Software Package.

3.   Miscellaneous

     3.1  This Agreement shall be binding upon Employee and shall survive
termination of Employee's employment for a period of two (2) years.

     3.2  DPI is an intended beneficiary of this Agreement. Upon failure of
Employee to keep and perform the terms and conditions of this Agreement, DPI or
Employer may seek any and all remedies available at law or in equity, including
injunctive relief, together with costs and attorney fees.
 

     ----------------------------------  ---------------------------
     Employer                            Date

 
     ----------------------------------  ---------------------------
     Employer                            Date

                                      -14-
<PAGE>
 
                                SOFTWARE LICENSE

                                   EXHIBIT 7
                            SOFTWARE SPECIFICATIONS
                            (Paragraphs 2.4 and 2.5)

================================================================================

     The attachment represents the minimum specifications of the systems.
Enhancements and upgrades are a continual process, therefore some specifications
may change prior to physical installation.

                                      -15-
<PAGE>
 
WIDE AREA TELECOMMUNICATIONS SERVICE (WATS) RATING & BILLING
============================================================

Standard Features:

     .  On-Line Entry, Inquiry and Update

     .  User Friendly

     .  Menu and Screen Driven

     .  Operator Oriented Prompt Screens

     .  Comprehensive Reporting

     .  On-Going Updates Provided For FCC Approved Tariff Changes

     .  Uses Standard 8 1/2 x 11" and 14 7/8" x 11" Computer Paper

Application Features:

     .  Accommodates INWATS/OUTWATS/Two-Way WATS Billing

     .  Designed To Make Changes Easily When New Tariffs Are Approved

     .  Multiple Cycle Billing

     .  WATS Billing Data Can Be Printed For Edit And Review

                                      -16-
<PAGE>
 
GENERAL LEDGER APPLICATION

================================================================================
    
The GENERAL LEDGER system is designed to operate as an independent operating
application or as an integrated module with other applications. This system will
process multiple companies, locations, and cost centers. It allows up to *
unique general ledger formats for each company for printing the various reports
such as Operating Statement, Balance Sheet and Cost Center reports. All journal
entries posted to the general ledger are stored in the Accounting History fee.
The Journal Report By Source Code, General Ledger Detail Report By Account and
General Ledger Summary Report By Account are generated using the information
contained in this file. The system is designed to handle companies by fiscal or
calendar year. All companies have a master control record in the Master Data
Base. The information contained in the master control record determines how a
company is to be processed.        
    
All journal entries entered into the system have a control field for control
month and control year.  These fields control where the journal entries will be
posted in the ledger files (General Ledger Balance Forward, Work Order Ledger).
The General Ledger and Work Order files have a starting balance field and
*    control fields for annual processing. Multi/Year ledgers can be retained
in the ledger files. The system will convert to fiscal prior to posing the
ledger files. Detail journal entries are posted to the Accounting History file
and all entries charged to work orders are posted to the World Order History
file. The Accounting System is designed to group accounting entries by type of
entry and where the entry came from. In order to accomplish this, a source code
is provided to group entries from Payroll, Accounts Payable, Billing, A/R
Payments, Inventory and Manual Journal Entries.       

Below is a list of valid source codes:
    
* Chart deleted        

                                      -17-
<PAGE>
 
Standard Features Include:

     .    G/L Accounts Inquiry/Update

     .    G/L Budget Maintenance (used for setting up budget amounts for profit
          and loss statements)

     .    Profit & Loss Format Maintenance

     .    G/L Spread Master Maintenance

     .    G/L Year End Close

Reporting Includes:

     .    Journal Listing By Date Range Selection (from year/month to
          year/month)

     .    G/L Chart of Accounts Listing

     .    Profit and Loss Formats Listing

     .    G/L Detail Report By Date Range Selection (month and year)

     .    G/L Summary Report by Date Range Selection (month and year)

     .    G/L Spread Edit

     .    Financial Reports by Profit & Loss Format Selection (balance sheet
          operating statement, etc.)

Special Features:
    
* Chart deleted       

                                      -18-
<PAGE>
 
PAYROLL/LABOR DISTRIBUTION APPLICATION

================================================================================

Standard Features Include:

     .       Hourly and Salary Employee Processing

     .       Weekly, Biweekly, Semimonthly And Monthly Pay Frequencies

     .       Twenty-five (25) Voluntary Deductions (Insurance, Profit Sharing,
             Credit Union, etc.) Per Employee, And Ninety-nine (99) Per Company,
             In Addition To Tax Deductions

     .       Seven (7) Deduction Frequency Code Options (indicates how often
             deduction will be taken: each pay period, first and third pay
             periods only, etc.)

     .       Labor Costs Distribution To Detail Or Summary General Ledger
             Account Level (user defined)

     .       Labor Costs Accumulation By Work Order Number

     .       Designation of Direct or Indirect Labor

     .       Employee Master File Entry/Inquiry/Update (Employee number, name,
             address, employment date, marital status, rate, sick leave,
             deductions, department number, vacation, YTD amounts, exempt
             dependents, pay period, etc.)

     .       Master Control File Inquiry/Update (general ledger account numbers,
             deduction codes, state information, married and single percentage
             withholding tables, etc.)

     .       Time Card Information Entry/Update

     .       Calculate Trial Payroll (optional feature)

     .       Calculate Payroll (gross, taxes and voluntary deductions)

     .       Manual Check Entry/Validation

     .       Voided Check Entry

     .       Print Payroll Checks

     .       Print 941-A Forms

                                      -19-
<PAGE>
 
     .  Print W-2 Forms

Reporting Includes:

     .  Employee Master File Listing (all employees)

     .  Updated Employees Only Listing (payroll changes)

     .  Time Card Edit

     .  Employee Year-To-Date Listing (reflects gross pay, deductions, FICA,
        etc.)

     .  Trial Payroll Register (optional feature)

     .  Payroll Register

     .  Deductions Register

     .  Labor Distribution Register

     .  Labor Analysis Reports By:

          .  941-A Quarterly Report
          .  Employee W-2 Yearly Report
          .  Employee Payroll Detail Listing by Date Range Selection (reflects
             detail information for all payrolls processed during the date
             range selected)

     .  Payroll Data Base control Records Listing (reflects all control records
        maintained in the payroll database control files)

Special Features:
    
* Chart deleted       

                                      -20-
<PAGE>
 
ACCOUNTS PAYABLE APPLICATION

================================================================================

General:

This application provides the capability for entering into the system and
maintaining accounts payable information. The accounts payable system processes
all payable information on an open item basis. Transactions into the system
result from the processing of the direct payable transactions from the screen
input and mechanized computer entries. All information is maintained in detail
on a vendor/invoice basis. The system prints checks and allows hand check
processing with automatic journal entry process. The system produces detail
aging by customer and invoice and summary aging by customer reports. A cash
requirements report can be generated for each company and payment amounts are
listed by due date. The system has the ability to release by due date and has 
on-line inquiry to the open item file. All control accounts are entered in the
accounts payable control maintenance and are stored in the system data base. All
offset accounts and ranges are user defined. Standard features include
applicable user file inquiry, update maintenance functions and comprehensive
reporting.

Standard Features Include:

     .    Independent Reporting For Each Company                              

     .    Open Item Master File                                               

     .    On-Line Display And Update Via Screen                               

     .    Complete Detail Aging Analysis By Open Item                         

     .    Cash Requirements Reporting                                         

     .    Computer Checks And Manual Check Processing With Full Journal Entry 
          Reporting To General Ledger                                       

     .    Interfaces To Other System Applications                             

     .    Complete History Of All Invoiced Amounts, Debit Or Credit Adjustments
          And Payments                                                      

     .    General Ledger Entry/Update (Accounts payable vouchers and journal  
          entries)                                                          

     .    Vendor Inquiry By Company And Vendor Number Selection               

     .    Release Accounts Payable Hand Checks From Open Item Payables File By
          Voucher Or Document Number                                           

                                     -21-
<PAGE>
 
     .    Process Accounts Payable Hand Checks And Generate Appropriate Journal
          Entries                                                              
                                                                               
     .    Release Accounts Payable Checks By Company And Due Date Selection    
                                                                               
     .    Print Accounts Payable Checks By Company Selection And Generate      
          Appropriate Journal Entries                                          
                                                                               
     .    Accounts Payable Control Maintenance Inquiry/Update                   

Reporting Includes:

     .    Invoice Edit (Accounting Input Edit)      
                                                    
     .    Accounts Payable Detail and Aging Reports 
                                                    
     .    Cash Requirements Report (By due date)    
                                                    
     .    Accounts Payable Check Pre-Register       
                                                    
     .    Hand Checks Processed Report              
                                                    
     .    Vendor Listing                             

Special Features:
    
          *   Chart deleted       
                                     -22-
<PAGE>
 

INVENTORY APPLICATION

================================================================================

General:

This application provides the capabilities for entering into the system and
maintaining inventory and purchase order information. All inventory items are
maintained by company number, inventory item number and bin number in the
inventory master file. This file contains entries for company and inventory item
number, last date item was updated, inventory class, unit of measure, quantities
on hand and on order, MTD and YTD quantities for receipts, issues and
adjustments, current average cost, beginning of year on hand quantity, current
inventory value, primary and secondary vendor numbers, reorder point, staging
quantity breakdowns and reorder quantity. This information is accessible through
the inventory item inquiry or maintenance screen programs.

New purchase orders and inventory issues, receipts and adjustments are entered
via the transaction entry screen programs. After the transactions to be
processed have been entered, edit reports are generated for verification and
correction purposes prior to posting the transaction entry information to the
applicable inventory and purchase order files. During the posting cycle, each
inventory item having a receipt, issue or adjustment transaction is updated and
the open purchase order item quantities are reduced based on the quantity
received for each purchase order item. The application allows for automated
posting to the General Ledger for all inventory transactions during a month.
Current inventory dollar values are reduced accurately using calculations that
generate the true average cost of each inventory item being issued. Standard
features include applicable user file maintenance functions and the
comprehensive reporting.

Standard Features Include:

     .    Inventory Item Inquiry By Company Number, Item Number and Bin

     .    Label Selection

     .    Inventory Transactions Entry/Inquiry/Update

          .    Transaction Types:

               -    1)  Receipts
               -    2)  Transfers
               -    3)  Adjustments
               -    4)  Purchase Orders

                                     -23-
<PAGE>
 
Reporting Includes:

     .    Active Inventory Item Number Listing (reflects all inventory items
          maintained in the inventory master file; includes company number, item
          number, class and description, unit of measure, item status, and
          totals for active items and inactive items)

     .    Inventory Transactions Entry Edits For: Receipts, Transfers,
          Adjustments and Purchase Orders

     .    Inventory Stock Status Report

     .    Inventory On Order Report

     .    Transaction Activity Report

     .    Inventory Activity To-Date

Special Features:
    
          * Chart deleted     
                                      -24-
<PAGE>
 
WORK ORDERS APPLICATION

================================================================================

The WORK ORDERS application provides the capability for entering into the system
and maintaining work order information by company number and work order number.
The work order master file accommodates entries for the work order number,
company number, project description, project completion date, estimated
completion date, budget and project status. Project cost to date information is
generated and maintained via journal entries created through the Accounts
Payable, Payroll Inventory and General Ledger applications. User assigned
account number entries are allowed for defining valid work order ledger account
numbers and the associated account number description. The information
maintained in the work order master and account number files is used for
validation purposes when the associated project costs are being allocated to the
work order or the completed work order costs are being spread to the Continuing
Property Records. Only valid work orders that reflect a project completion date
can be spread to the Continuing Property Records and completed work orders may
be purged from the work order master file by accounting year and month
selection. Standard features include applicable user file maintenance functions
and reporting includes Work Order Detail and Summary reports and a Work Order
Master File listing.

Standard Features Include:

     .    Work Order Master File Entry/Inquiry/Update

     .    Purge Completed Work Orders By Date Range Selection

          .    Valid General Ledger Work Order Accounts Inquiry/Update
               (accommodates as many work order accounts and account
               descriptions as the general ledger chart of accounts - up to
               9,999,999)

Reporting Includes:

     .    Work Order Detail Ledger Report (reflects detail transactions by work
          order)

     .    Work Order Summary Ledger Report (reflects work order activity costs
          by general ledger account for twelve (12) month period)

     .    Work Order Master Listing (reflects all current work orders, including
          work order number, project description, project completion date and
          project cost-to-date amounts)

Special Features:
    
          * Chart deleted     
                                     -25-
<PAGE>
 
CONTINUING PROPERTY RECORDS APPLICATION

================================================================================

General:

This application provides the capability for entering into the system and
maintaining continuing property records information. The application
accommodates 1) continuing property items entry 2) spreading of completed work
order costs to continuing property items and 3) retirement of specific
continuing property items. Standard features include applicable user file
inquiry, update maintenance functions, comprehensive audit trail and analysis
reporting.

Standard Features Include:

     .    Continuing Property Item Entry/Inquiry/Update

     .    Continuing Property Item Retirement Quantity Entry

     .    Spread Work Order Costs to Continuing Property Records

     .    Continuing Property Records Spread Amounts Update (updates CPR item
          masters with appropriate work order spread amounts)

     .    Continuing Property Records Item Retirement Update (updates CPR item
          masters with appropriate retirement quantities)

     .    Continuing Property Records Month End Reset (clears MTD received and
          retired quantity amounts)
 
     .    Continuing Property Records Year End Reset (clears MTD and YTD
          received and retired quantity amounts and updates beginning year
          totals)

Reporting Includes:

     .    Work Order Spread Amounts Edit (reflects work order amounts to be
          spread to each CPR item)

     .    Work Order Spread Amounts Posted Report (reflects work order amounts
          posted to each CPR item)

     .    Retired Continuing Property Record Items Posted Report (reflects
          retirement quantities posted to each CPR item)

     .    Continuing Property Records Analysis Report (reflects property
          analysis by exchange and plant type)

                                     -26-
<PAGE>
 
     .    Active Continuing Property Records Item Number Listing (reflects
          active CPR item numbers by exchange)

     .    Continuing Property Records Factored Quantity Analysis Report For All
          Exchanges (reflects totals by plant type and general ledger account
          number. Detail information includes: plant type, CPR item number, item
          description, last update, in place quantity and cost, unit of measure,
          factor of measure, factor of measure, factored quantity and property
          value. The item factor of measure allows the user to convert one type
          of measurement to another type of measurement, i.e., wire or cable
          footage to miles. This converted information can be used for both
          internal or external reporting purposes)

Special Features:
    
          * Chart deleted     
                                     -27-
<PAGE>
 

COMMERCIAL BILLING APPLICATION

================================================================================

     .    On-Line Access To Current & Comprehensive Subscriber Billing
          Information

     .    Subscriber Information Accessed By Name Or Telephone Number Selection:
 
          .    Primary Subscriber                .    Adjustments     
                                                                      
          .    Miscellaneous                     .    Payments        
                                                                      
          .    Service and Equipment             .    Treatment       
                                                                      
          .    Directory                         .    Toll            
                                                                      
          .    Group Billing                     .    Plant           
                                                                      
          .    Accounts Receivable               .    Trouble         
                                                                      
          .    Calling Card                      .    Service Order   
                                                                      
          .    Deposits and interest             .    Prior Billing    

          .    Equal Access information

     .    Scroll Screen Functions Facilitate Information Retrieval

     .    Accounts Receivables Payments

     .    Accounts Receivables Adjustments

     .    Group Billing

     .    Toll Processing

     .    Unlocated Toll

     .    Service & Equipment

     .    Service & Equipment Proration

     .    Service & Equipment Rate Changes

     .    Detail Or Summary DA Call Billing

                                     -28-
<PAGE>
 
     .    Cycle Billing (Accommodates Up To 99 Billing Cycles)

     .    Subscriber Reassignment

     .    Subscriber Treatment

     .    Deposits & Interest

     .    Calling Cards

     .    Subscriber Write Off

     .    Subscriber Billing Statements

     .    Reminder Notices

     .    Bank Drafts

     .    Subscriber Credit Rating Promotion/Demotion

     .    Accounts Receivable Reporting, Control And Auditing

     .    Directory Assistance Reporting

     .    High Toll Usage Reporting

     .    Advance or Arrears Billing Methods

     .    Subscriber Billing Information Updated From NYNEX DPI Service Order
          Application

     .    Variable Billing Statement Form Print Formats Available

     .    User Defined Billing Statement Handling Codes

     .    Allows Up To 99 Billing Statement Copies Per Subscriber

     .    Billing Statements Printed By Cycle With Handling Code.  Phone Number
          Order Option

     .    On-Line Balance Forward Accounts Receivable and Credit Rating
          Information Inquiry For Each Billing Period Per Main Number Billed

     .    Unlimited Number of Billing Periods Can Be Maintained

                                     -29-
<PAGE>
 
     .  Subscriber Physical Address Can Be Defined By: State, City, Subdivision,
        Street Name, Street Number, Street Direction a nd Street Subtitle,
        Building, Building Sub-number

     .  Free Format Directory Listings

     .  User Defined Directory Codes

     .  Multiple "List With" Entries

     .  Allows Prefix Designation To The Subscriber Service and Equipment Item
        Level For Special Rates (i.e., Vacation, Convention, etc.)

     .  Automatic Booking Of Refunds To Subscriber's Bill

     .  Industry Standard EMR 210 Toll Record Format Used Throughout Billing
        Process

     .  Up To 12 Months of Detail Toll information Can Be Accessed For Inquiry,
        Investigation Or Reporting Purposes

     .  Toll Dollar Limit Amounts Can Be Designated For Credit Or Security
        Deposit Purposes

     .  Up To 999 Deposit, Interest and Refund Amounts Per Subscriber

     .  User Defined and Controlled Data Base Control Records

     .  On-Line Entry, Inquiry and Update Menu and Screen Driven

     .  Operator Oriented Prompt and Instruction Screens

     .  Comprehensive Reporting With Variable Selections

     .  Comprehensive User Oriented Documentation

                                      -30-
<PAGE>
 

SERVICE ORDER

================================================================================

     .  On-Line Multi-User One Step Process Service Order Entry

     .  On-Line Access To Current And Comprehensive Service Order and Subscriber
        Billing Information

     .  Automatic Service Order Number Assignment

     .  Automatic Screen Mode For Entry Of New Orders

     .  Optional Planning Schedule Interfacing and Usage Reporting

     .  Service Order Entry Information Validated Against Data Base

     .  Automatic Retrieval of Existing Subscriber Information During Service
        Order Entry

     .  Scroll Screen Functions Facilitate Information Retrieval:

        .  Service Order By Number
        .  Service Order By Name
        .  Service Order By Telephone No. Number (Open Only)
        .  Service Order By Number (Open Only)
        .  Physical Address By Location
        .  Physical Address By Street
        .  Subscriber Deposits
        .  Line Card By Location
        .  Line Card By Street
        .  Line Card By Special Circuit
        .  Line Card By Telephone Number
        .  Line Card By Distribution Cable Card
        .  Line Card By Name
        .  Service & Equipment By Item Code
        .  Calling Card By Sequence Number

     .  Comprehensive Service Order Information:

        .    Physical Address             .  Service and Equipment
        .    Billing                      .  Calling Card
        .    Additional Subscriber        .  Free Form Memo w/Unlimited Pages
        .    Advance Payment And Deposit  .  Basic Order
        .    Directory                    .  Line Card


                                     -31-
<PAGE>
 

     .  User Defined Service Order Types

     .  Customer Contact Memo Printing With Multiple Copies Option

     .  Mass Order Processing Capability (No. Change, Disconnect, Switch Cut,
        etc.)

     .  Comprehensive Audit & Balancing Features

     .  Service Results Tracking

     .  Multi-Level Service Order Scheduling And Rescheduling

     .  Service Order Processing By Actual Completion Date or Effective Date

     .  Service Order Printing Controlled By User Designation

     .  User Defined Variable Print Routing Of Service Order Forms

     .  Automatic Removal Of Old Subscriber Information On Number Change,
        Transfer, And Disconnect Orders

     .  User Defined And Controlled Data Base Control Records

     .  On-Line Entry, Inquiry and Update

     .  Menu and Screen Driven

     .  Operator Oriented Prompt and Instruction Screens

     .  Comprehensive Reporting With Variable Selection Options:

        .   Service Order Information      .  Subscriber Information
        .   Service Order Activity         .  Before & After Service Order Post
        .   Advance Payments and Deposits  .  Station Gain and Loss   
        .   Planning Schedule Usage        .  Number Changes
        .   Service Order Log              .  Comprehensive User-Oriented
                                              Documentation


                                     -32-
<PAGE>
 
 
GENERAL PLANT/LINE ASSIGNMENT

================================================================================

     .    On-Line Inquiry To Current Line Card Information Including:
 
          . Physical Address
          . Dedicated Cable and Pair   . Service Order Activity
          . Distribution Drop          . Trouble Activity
          . Map Number                 . User-Defined Data Fields
          . Terminal Location          . Service and Equipment
          . Cable Network              . Carrier Information
          . Telephone Number           . Central Office Information
          . Service Type               . Special Circuit Information
          . Name                       . Detached Extension Information
          . Connect/Disconnect Date

     .    Service Area Master Broken Down By:
 
          . State (Or Region)          . Street Subdescription
          . City                       . Map Number
          . Subdivision                . Dedicated Cable and Pair
          . Street                     . Terminal Location #1
          . Street Direction           . Terminal Location #9
          . Street Subtitle            . Building Number
          . Street Number              . Building Subnumber
 
     .    Line Card Access By:
 
          . Telephone Number           . Distribution Cable
          . Name                       . Address
          . Special Circuit            . Street
 
     .    Line Card Scroll By:
 
          . Telephone Number           . Distribution Cable
          . Name                       . Address
          . Special Circuit            . Street

     .    Standard Listings and Reporting Including:

          . Line Card Print Out
          . Line Card Listing
          . Cable Usage Reports

                                     -33-
<PAGE>
 

Standard Features Include:

     .    Cable Network Assignment To Selected Address

     .    Cable Usage For All Or Specific Cable Routes (Available Pairs And
          Percentage Usage)

     .    Interface Into Billing, Service Order, And Trouble Applications

     .    Reports And Listings For Line Cards

     .    Validation Of Information Against User Defined Data Base

     .    Automatic Central Office Assignment, Direct Interface of Central
          Office Data Base To Commercial Representatives. Total Assignment To
          Premise May Be Accomplished From Commercial Office.

Currently Under Development:

     .    Automatic Polling of Central Office Diagnostics By Trouble Clerks.
          Results of Test Will Be Attached Automatically To Trouble Ticket.

                                     -34-
<PAGE>
 

TROUBLE REPORTING APPLICATION

================================================================================

General

This application provides the capability for entering into the system and
maintaining subscriber telephone trouble information. The application
accommodates 1) subscriber trouble entry 2) REA or user defined and controlled
data base 4) purging of cleared trouble calls from the system by date selection
and 5) printing of trouble codes and descriptions.

     .    Trouble Information Includes:

          . General Information                . Completion Information
          . Line Card Information              . Physical Address Information
          . Service and Equipment Information  . Subscriber Miscellaneous
                                                 Information (User-Defined)
          . Memo Information
          . Scheduling Information             . Testing Information
          . Dispatch Information

Standard Features Include:

     .    Subsequent and Common Cause Tickets

     .    Automatic Completion Of Common Cause Tickets

     .    Automatic Crediting of S/E Charges (User Option)

     .    Entry of Service Charges

     .    Unlimited Trouble History Capability

     .    Unlimited Memo Screen Information

     .    Trouble Ticket Printout Up To Twenty Locations

     .    Buried Drop Wire Requirements Reporting

     .    REA User Defined Reporting

     .    Validation Against Disconnect For Nonpayment Information

     .    User Defined Trouble Scheduling/Dispatch Tracking

                                     -35-
<PAGE>
 

     .    Purge Trouble File By Date Range Selection (All Cleared Trouble
          Records Having A Trouble Report Date That Is Equal To Or Less Than The
          Date Entered Will Be Purged From The System)

     .    Assign To Trouble Ticket Information By:

          . Ticket Number                         . Telephone Number
          . Address                               . Circuit Number
          . Appointment Date And Time             . Billing Name
          . Line Card Number                      . Cable Pair
 
     .    User Defined Data Base Information Includes:
 
          . Trouble Ticket Types                  . Cause Codes
          . Report Codes                          . Fault Codes
          . Action Taken Codes                    . Memo Information
          . Plant Class Codes                     . Completion Status Codes
          . Plant Usage Codes                     . Source Codes
          . Plant Item Codes                      . Trouble Service Results Code
          . Manufacturer Codes                    . Test Result Codes
          . Weather Codes                         . Appointment Codes
 
     .    User Controlled Information Includes:
 
          . Validation And Closeout Requirements  . REA Reporting
          . Entry Screen Access                   . Trouble Ticket Printing

Reporting Includes:

     .    Trouble Analysis Report By Variable Option Selection

          .    Detail Trouble By Telephone Number- (Reflects trouble location,
               report number and code, action taken, line number, reported data
               and time, cleared date and time, employee number, hours elapsed,
               plant class and item, manufacturer code, fault code, cause code,
               weather code, reassigned telephone number designation and total
               number of troubles reported.  Elapsed time is calculated from the
               time the trouble was reported to the time the trouble was
               cleared.)

          .    Summary Trouble By Exchange- (Reflects number of months
               processed, plant class code and description, plant item and
               description, number of troubles, trouble rate, plant units, index
               base sheath miles, etc., totals for number of troubles cleared,
               trouble reports, other reports and associated number of

                                     -36-
<PAGE>
 

               troubles, trouble rate, plant units and index base, and the
               exchange trouble percentage of all trouble.)

          .    Summary Trouble For All Exchanges By Plant Class - Reflects
               number of troubles, trouble rate, plant units and index base
               total stations for total troubles cleared, total other reports,
               total trouble reports, plant class and the plant class trouble
               percentage of all trouble.)

Variable Options:
 
          -    Weather                -    To Date Reported
          -    Manufacturer           -    Plant Item
          -    Exchange               -    From Date Reported
          -    Report Number          -    Report Code
          -    Fault Code             -    Incomplete Only
          -    Repair Person I.D.     -    Plant Class
          -    Cause Code

     .    Trouble Code And Descriptions Listing (Reflects all active trouble
          codes and descriptions)

Special Features:
    
          * Chart deleted     

                                     -37-
<PAGE>
 

TOLL CENTER RATING AND REPORTING

Standard Features:

     .    Rated Toll Data and Applicable Non-rated Converted Message Types
          Interfaces To The NYNEX DPI Commercial Billing Application

     .    Can Be Used Stand Alone With Other Billing Application Software

     .    User Selection Options Provided For Rating "One Rate Period Messages"
          and Rate Period Specific Billing (RPSB)

     .    On-Line Entry, Inquiry and Update

     .    Menu and Screen Driven

     .    Operator Oriented Prompt and Instruction Screens

     .    Comprehensive Reporting With Variable Selections

     .    Comprehensive User Oriented Documentation

     .    Standard 14 7/8" X 11" Computer Paper.  No Special Forms Required.

Application Features:
    
     * This information has been deleted. A total of 3 pages have been omitted 
       from this "Application Features" section.     

Reporting:

     .    Terminating Point Master (TPM) File Listings Selection Options:

          .    Beginning and Ending Place Abbreviations
          .    Beginning and Ending Area Codes
          .    Beginning and Ending Exchange Numbers
          .    Combination of Above

     .    ATTIX Master File Listings Selection Options:

          .    Beginning Ending Area Codes
          .    Beginning and Ending Exchange Numbers
          .    Combination of above

                                      -38-
<PAGE>
 

     .    Other Carrier Master File Listings Selection Options:
 
          .    Beginning and Ending Area Codes
          .    Beginning and Ending Exchange Numbers
          .    Combination of Above

     .    Rate Table Master File Listings Selection Options:
 
          .    Carrier Code            .    Rating Period Code
          .    Lata Indicator          .    Non-overseas and Overseas Points
          .    Place Code              .    Combination of Above
          .    Type Code (PP,SS,DD,CC)
 
     .    Rate Period Master File Listings Selection Options:
 
          .    Year To List            .    Call Type (PP,SS,DD,CC)
          .    Carrier Code            .    Non-Overseas and Overseas
          .    Lata Indicator          .    Combination of Above
          .    Place Abbreviation

     .    Exchange Master File Listings Selection Options:

          .    Individual Exchange
          .    All Exchanges

     .    Dial-It Master file Listings Selection Options:

          .    Individual Area Code
          .    All Area Codes

     .    Company Master File Listings Selection

     .    State Tax Master File Listing

     .    Collect Surcharge Master File Listing

     .    Group Location Master File Listing Selection Options:

          .    Individual Group Location
          .    All Group Locations

     .    Independent To Independent Points Master File Listing

                                     -39-
<PAGE>
 

     .    List All Toll Center Rating Data Base Master files

     .    Conversion Summary (Edit Reports)

          .    EAX No. 1, No. 2 and No. 5 Tape
          .    SATT Tape
          .    TOPS Tape
          .    Mark Sense

     .    Hand Tickets Edit Report

     .    Connect Hour Peg Count Summary Report

     .    Unratable Toll Listing (Invalid Tickets). Multiple Copies Option
          Provided in Toll Rating Process.

     .    Credit Toll Listing. Multiple Copies Option Provided in Toll Rating
          Process.

     .    Message Toll and WATS Data/B-I Settlement Reports Selection Options:

          .    Beginning Month and Day of Report
          .    Ending Month and Day of Report
          .    Year of Report
          .    Number of Copies
          .    Print Intra/Inter Lata Separately (Yes/No)

     .    Tape Invoice Summary Report

User Requirements:

The user is responsible for accommodating the transfer of tape data to and from
the AS/400 computer via tape drive or direct communication processing.

Ticketing Record Format Conversion Requirements:

Record format conversion programs are required for ticketing record formats not
presently accommodated by this application.

                                     -40-
<PAGE>


CARRIER ACCESS BILLING SYSTEM (CABS)

Standard Features:

     .  Stand Alone Application

     .  On-Line Entry, Inquiry and Update

     .  User Friendly

     .  Menu and Screen Driven

     .  Operator Oriented Prompt Screens

     .  Comprehensive Reporting

     .  On-going Updates Provided For FCC Approved Tariff Changes

     .  Uses Standard 8 1/2 x 11" and 14 7/8" x 11" Computer Paper

Application Features:
    
     *  This information has been deleted. (Two pages have been 
        omitted from this "Application Features" section)     

Reporting:

     .  Message and Minute Count Audit Report

     .  Measured Feature Group Usage Report

     .  Non-measured Feature Group Service Report

     .  Special Access Lines (S.A.L.) Recurring and Nonrecurring

     .  Installation Charges Report

     .  Billing and Collection Charges Report

     .  Accounts Receivable Transaction Report

     .  Management Analysis Reports consist of:

          . NECA Report (Current Month and Year-To-Date)
          . USOC Count Report

                                     -41-
<PAGE>
 
Listings:  (All Generated By Company, Carrier Combinations)

     .  Company Information Listing

     .  Carrier Information Listing

     .  CLLI Code Listing

     .  Switched and Special Route Listing

     .  Wire Center Listing

     .  Wire Center Message Factor Listing

     .  FCC Account Listing

     .  Charge Code Listing

     .  Wire Center Trunk Group Routing Listing

     .  Feature Group Rate Listing

     .  Universal Service Order Code (USOC) Listing (Utilizing Daily and Monthly
        Rates, Recurring and Nonrecurring Charges)

     .  Special Transport USOC Listing

     .  Access Connection USOC Listing

     .  Special Access Line USOC Listing

     .  Features and Functions USOC Listing

     .  Channel Mileage USOC Listing

     .  Point of Termination USOC Listing

     .  Channel Termination USOC Listing

     .  Billing and Collections USOC Listing

     .  Installation USOC Listing

     .  Rate Period Listing

                                      -42-
<PAGE>
 
     .  Carrier Network Listing

                                      -43-
<PAGE>
 
DATA BASE SYSTEM CONTROL RECORDS

================================================================================

General

The System Software is a highly integrated system with application programs
sharing common information to reduce redundant information being setup for each
application.  All control records are user defined and controlled, and only have
to be entered one time.

Once setup, all associated applications have immediate access to the data
entered.  This common integration not only helps reduce the required hardware
disk storage, but also provides more accurate editing and cross checking of the
application information entries through the built-in entry validation processes.

The system control record information must be entered first, as all other
applications utilize this information.  The control records for each application
must be setup prior to processing of that application.  Listings for each
control record type can be generated for initial setup validation, maintenance
and on-going reference purposes.

The following is a list of the current system control records used.

SYSTEM CONTROL MAINTENANCE
- --------------------------------------------------------------------------------

     1.  Company Information
     2.  Location Information
     3.  Department Information
     4.  Data Base Sequence Counters Maintenance
     5.  State Tax Codes
     6.  Batch Jobs Control Information
     7.  City Code
     8.  County Code
     9.  School Code
     10. Tax District
     11. Batch Jobs Control Information
     12. Intercompany Transfer J/E Data Base

BILLING CONTROL MAINTENANCE
- --------------------------------------------------------------------------------

     1.  Exchange Code
     2.  Service Code
     3.  Billing Method
     4.  Toll Limit
     5.  Handling Code
     6.  Credit Rating

                                      -44-
<PAGE>
 
     7.   Deposit Code
     8.   Interest Method
     9.   Billing Cycle
     10.  EMR Toll Record ID
     11.  Directory Code
     12.  Charge Codes
     13.  Service & Equipment Item
     14.  Service & Equipment Category
     15.  Service & Equipment Class Code
     16.  Directory Assistance Charges
     17.  Other Tax
     18.  EMR Message Type
     19.  EMR Rate Class
     20.  EMR Rate Period
     21.  Equal Access Transaction Codes
     22.  Equal Access Status Indicator
     23.  Matrix Category Codes
     24.  Payment Type Codes
     25.  Private Line Type Codes
     26.  "BRMIS" Item Codes
     27.  "BRMIS" Charge Codes
     28.  Billing Journal Entries
     29.  Corner Default Payment
     30.  Caller I.D. Codes
     31.  Toll Concession
     32.  Optional Calling Plan
     33.  OCP Schedule Definition
     34.  OCP Rerate Period
     35.  OCP Rerate Table
     36.  Tax Exempt Location
     37.  Reverse Billing

PAYROLL CONTROL MAINTENANCE
- ---------------------------

     1.   Payroll Rate
     2.   Hour Type
     3.   Paid Period Information
     4.   Hour Groups
     5.   Check Information
     6.   State Information
     7.   FICA Tax Limits
     8.   Federal Tax Table
     9.   The Card Hour Types
     10.  Deduction Information

                                      -45-
<PAGE>
 
     11.  Class Description
     12.  Grade Description
     13.  Step Description
     14.  Job Description
     15.  Education
     16.  Check Distribution
     17.  Last Raise Reason
     18.  Termination Reason
     19.  Labor Function Code
     20.  State Tax Tables
     21.  Deduction Registers Control
     22.  Sick Information
     23.  State FIPS 5-1 Code

                                      -46-
<PAGE>
 
WORK ORDER CONTROL MAINTENANCE
- --------------------------------------------------------------------------------

     1.   Project Status

SERVICE ORDER CONTROL MAINTENANCE
- --------------------------------------------------------------------------------

     1.   Last S/O Number
     2.   Routing Control Master
     3.   Contact Memo Routing
     4.   Service Order Type Codes
     5.   ISR Type Codes
     6.   Service Order Type Codes
     7.   Reason Not Complete Codes
     8.   Planning Schedule Codes
     9.   Employee Code
     10.  Memo Default
     11.  Service Order Entry Default
     12.  Service Order Stage Code Description

CONTINUING PROPERTY RECORD MAINTENANCE
- --------------------------------------------------------------------------------

     1.   Item Number
     2.   Plant Type
     3.   Plan/Item Combinations

GENERAL PLANT MAINTENANCE
- --------------------------------------------------------------------------------

     1.   State
     2.   City
     3.   Subdivision
     4.   Street Name
     5.   Street Direction
     6.   Street Subtitle
     7.   Taxing District
     8.   County Codes
     9.   School Codes
     10.  Cable Type Codes
     11.  Cable Record Codes
     12.  Distribution Cable Pair Counts
     13.  Line Card Miscellaneous Description Information
     14.  Cross Connect Box Location
     15.  Features and Functions

                                     -47-
<PAGE>
 
INVENTORY MAINTENANCE
- --------------------------------------------------------------------------------

     1.   Staging and Disbursement Codes
     2.   Offset G/L Account

TROUBLE MAINTENANCE
- --------------------------------------------------------------------------------

     1.   Trouble Control Master
     2.   Printing Control Master
     3.   Ticket Type
     4.   Source Code
     5.   Report Code
     6.   Schedule Code
     7.   Appointment Code
     8.   Plant Class
     9.   Plant Item
     10.  Plant Category
     11.  Fault Code
     12.  Cause Code
     13.  Action Taken Code
     14.  Weather Code
     15.  Plant Usage Code
     16.  Manufacturer Code
     17.  Employee Code
     18.  Completion Status Code
     19.  Test Result Code
     20.  Service Result Code
     21.  Memo Form
     22.  Plant Class/Item
     23.  Plant Unit of Measure
     24.  Trouble Ticket Surge Description

                                     -48-
<PAGE>
 
                            Future Release Addendum
                            -----------------------

This document is an addendum to the Software License agreement, number LA97-10
between DPI/TFS, Inc. ("DPI") and Focal Communication Corporation ("FOCAL").

Both parties have discussed plans for the two releases that will transition
Telco Friendly Software to the Integrated Customer Management System.  The
functional specifications for these releases are attached hereto as Exhibits 1
and 2.

The schedule below reflect wireline object code software only.

          Release                  Availability

          Release 1              2nd quarter 1997
          Release 2              4th quarter 1997

These figures are based on the number of access lines provided for in the
current License Agreement between DPI and FOCAL. Provided that delivery is made
as shown above, FOCAL will be obligated to pay the charges shown.

Both parties agree and understand that development plans are subject to change
and that it is possible that the releases described in this Addendum may not be
delivered. If a specific release, described above, is not delivered by the
delivery date shown above or does not contain all of the functions described in
the applicable attached Exhibit, FOCAL's sole remedy is that it may choose not
to accept the Release as and when it is available and be entitled to a refund of
Software License Fees paid to date upon if the Telco Friendly Software is
returned as described in the Software License. Other than the specific remedies
set forth in this paragraph, neither party shall have any obligation to the
other for any failure to deliver the future Releases and functions described
above.

Licenses to the releases will be provided under the terms and conditions of the
existing Software License agreement unless modified or additional terms are
provided no less than thirty (30) days prior to delivery of the release.

Agreed:                                       Agreed:

DPI/TFS, Inc.                                 Focal Communication Corporation

By:      /s/ Mark Giles         By:           /s/ Robert C. Taylor, Jr.
   --------------------------      ------------------------------------------
Name     Mark Giles             Name:         Robert C. Taylor, Jr.
    -------------------------        ----------------------------------------
Title:   General Manager        Title:        President
      -----------------------         ---------------------------------------
Date:    4/10/97                Date:         4/9/97
      -----------------------         ---------------------------------------

                                      -49-
<PAGE>
 
                                   Exhibit 1
                                   Release 1
                                   ---------

Full details of each enhancement will be provided in external specification
documents once the final details are approved and have passed all quality
verifications and inspections.

1.   E911 Interface
- -------------------

     .  Supports National Emergency Number Association (NENA) Version 2 file
        format
           Master Street Address Guide (MSAG)
           Automatic Location Identification (ALI)
     .  Various input and output options
           Electronic via CA/400
           Magnetic Tape
           Paper

2.   Installment and Lease Support
- ----------------------------------

     .  Supports automatic calculation of installment and lease payments
           Recurring charges over time
           Calculates interest on installments and lease payments
     .  Tracks current versus past due balances
     .  Supports late payment charges (through Accounts Receivable by Service)
     .  Allows early payoff or balloon payments

3.   Billing for Internet Services
- ----------------------------------

     .  Converts data, provided from a Service Provider, into a toll record
        billable format
     .  Processes and bills regular and overtime usage to customer accounts
     .  Provides error reports and capability of correcting errors or returning
        to service provider
     .  Provides capability of billing multiple sessions as a single line item

4.   Graphical User Interface
- -----------------------------

     .  "Point and click" environment
     .  Provides a pictorial representation of screen data including graphs and
        charts
     .  Pull down menus, tool bars and message bars
     .  Integrates PC functions with TFS applications

                                      -50-
<PAGE>
 
5.   Directory Management System
- --------------------------------
     .  Provides a single place for the storage and retrieval of directory
        related information
     .  Customer data is defaulted no re-entry required.
     .  Allows out-of-alphabetical order placement of listings
     .  Allows the look-up of directory information by a wide variation of
        selections
     .  Allows maintenance of multiple directories and multiple sections within
        a directory
     .  Generates publisher directory tapes, electronic files and reports

6.   Flexible Taxation
- ----------------------
     .  Supports multiple jurisdictions
     .  Supports taxes paid by customer or company
     .  Provides tax on tax capabilities
     .  Supports foreign state tax on in-collect messages
     .  Provides a flat tax per call
     .  Message taxation rules by carrier, record ID and jurisdiction
     .  Supports limits (tax only amounts over or under a fixed amount)
     .  Provides overrides
     .  Provides unlimited taxes per geographic location and billing element

                                      -51-
<PAGE>
 
                                   Exhibit 2
                                   ---------
                                   Release 2
                                   ---------

Full details of each enhancement will be provided in external specification
documents once the final details are approved and have passed all quality
verifications and inspections.

1.   Flexible Pricing Plans (OCP's)
- -----------------------------------

     .    Combines non-recurring, recurring and usage charges
     .    Provides flexible Alters to select eligible charges
     .    Provide cross product discounting capabilities     
     .    Allows utilization of loyalty plans                 

2.   ICMS Plant Records
- -----------------------

     .    Retains logical plant record information   
               Devices and terminals with ports    
               Bandwidth-defined transport elements
     .    Supports fiber optic and data services      

3.   ICMS Service Orders
- ------------------------

     .    Provides an expanded service order number               
     .    Provides a "Fast Path" function for new connections     
     .    Allows simple customer changes to be input interactively
          Name/Address changes                                    
          Billing-only S&E additions/changes                       

4.   Provisioning Performance and Jeopardy Monitoring
- -----------------------------------------------------

     .    Measures service order activity and stage performance
     .    Provides proactive commitment management             
     .    Allows real-time monitoring of work flow             
     .    User defined parameters for performance monitoring    

5.   Disputes Management
- ------------------------

     .    Captures and tracks customer disputes, complaints and inquiries
     .    Supports adjustments to customer accounts                      
     .    Parameter driven allowing enforcement of business rules.       
     .    Work flow support                                               


                                     -52-
<PAGE>
 
6.   Faults Management
- ----------------------

     .    Fault entry on multiple customer services                            
     .    Automatic creation of common cause faults through Network Fault entry
     .    Group scheduling of faults                                           
     .    Link/Unlink capabilities                                              

7.   Near Real-Time Rating
- --------------------------

     .    Message processing using logical manager/server controls
     .    Processes small batches of switch records               
     .    On-line access to rated records in unbilled detail       

8.   Customer Correspondence
- ----------------------------

     .    Generate customer correspondence documents importing customer data
          into custom forms

9.   Migration Aids
- -------------------

     .    Utilities available for conversion processes

10.  Customer and Account Model
- -------------------------------

     .    Manage customers at entity level                       
     .    Discounts applied at service, account or customer level
     .    Summary billing available for multi-account customers   

11.  *Multi-Service Billing Enabled Capabilities
- ------------------------------------------------

     .    Wireline (Telephony)
          * .  Wireless
          * .  Cable Television
          * .  Combined billing
     .    One-stop customer service

*Note:    Release 3 multi-service billing enabled capabilities are available as
     separate purchases.  The base price of the ICMS product supports wireline
     services only.

12.  Customer at-a-time Billing
- -------------------------------

     .    24 Hour on-line day         
     .    Self recovering             
     .    Multi-thread for performance 

                                     -53-
<PAGE>
 
13.  Custom Statement Formats
- -----------------------------

     .    System generates statement details file
     .    Processed by:
          -  Out source print/stuff/mail
          -  IBM AFP Printers
          -  Custom Statement Formatter (CSF, an option, add-on product)
          -  Other print solutions

14.  Credit Card Payments
- -------------------------

     .    Supports electronic credit card payments

15.  Third-party Billing
- ------------------------

     .    Support for resale of services on combined bill
     .    Segregates accounts receivable for treatment and write off

16.  Number Portability
- -----------------------

     .    Support for both Incumbent and Competitive LECs
     .    Industry standard interfaces

17.  Interconnection Support
- ----------------------------

     .    Support for incumbent and Competitive LECs
     .    Track network element ownership and usage
     .    Ordering and order fulfillment
     .    Invoicing and invoice reconciliation

18.  Century Date Support
- -------------------------

     .    Year 2000 support throughout system functions

Release contents subject to change.

                                     -54-

<PAGE>
 
                                                                   EXHIBIT 10.21

                        EXECUTIVE EMPLOYMENT AGREEMENT
                        ------------------------------

     This Executive Employment Agreement is made as of this 15th day of July,
1998, by and between Focal Communications Corporation of California, a Delaware
corporation (and with its affiliates, including its parent corporation, Focal
Communications Corporation, collectively  referred to as the "Company") and
Andrew K. Robitshek, whose address is 22 Second Street, Apartment 301,
Sausalito, CA 94965 (the "Executive").

     WHEREAS, the Company and the Executive wish to enter into an agreement for
employment which shall provide certain terms of employment.  The parties
acknowledge that all terms of employment may not be contained in this Agreement,
but that as to other conflicting terms of employment, which may be initiated
from time to time by the Company, the terms contained herein, or as amended from
time to time by the parties hereto, shall control.

     NOW THEREFORE, in accordance with the premise above, the parties agree as
follows:

     1.   Terms of Executive's Employment.
          ------------------------------- 

          (a) Employment.  The Company hereby employs Executive, and Executive
              ----------                                                      
hereby accepts employment and agrees to perform his duties and responsibilities
hereunder, in accordance with the terms and conditions hereinafter set forth.
The Company shall have the right to terminate the Executive's employment for any
reason, at any time, with or without Cause (defined below).  Executive shall
have the right to terminate his employment for any reason, at any time, upon
giving the Company written notice two weeks prior to such termination.

          (b) Duties and Responsibilities.
              --------------------------- 

              (i)   Initially, the Executive shall serve as Vice President and
     General Manager, Focal Communications Corporation of California, and so
     long as Executive is employed by the Company (including affiliates), the
     Executive shall serve in such position as may be determined by the Board of
     Directors of Focal Communications Corporation ("Board") and shall perform
     all duties and accept all responsibilities incident to such position or as
     may be assigned to him by the Board, and shall at all times comply with the
     policies and procedures adopted by the Company for its employees.

              (ii)  The Company and Executive acknowledge that the Executive has
     entered into a prior agreement with the Company regarding employment
     issues, including non-competition matters and that this agreement shall
     amend and supercede such prior agreement.  The Executive represents and
     covenants to the Company that he is not subject or a party to any
     employment agreement, non-competition agreement, nondisclosure agreement or
     any similar agreement, covenant or restriction that would prohibit the
     Executive from executing this Agreement and performing his duties and
     responsibilities assigned by the Company.
<PAGE>
 
          (c) Extent of Service.  So long as Executive is employed by the
              -----------------                                          
Company or any of its Subsidiaries, the Executive agrees to use his best efforts
to carry out his duties and responsibilities under paragraph 1(b) hereof and to
devote his full professional time and attention thereto.

          (d) Base Compensation.  For all the services rendered by the Executive
              -----------------                                                 
hereunder, the Company shall, commencing on the agreed upon start date of this
Agreement and continuing so long as Executive is employed by the Company or any
of its Subsidiaries, pay the Executive an annual salary at the rate of $130,000
per year, plus any additional amounts, if any, as may be approved by a majority
of the Board, less withholding required by law or agreed to by the Executive,
and payable in installments at such times as is customary with the Company but
in any event no less frequently than monthly.  The Company agrees that the
Executive's salary will be reviewed annually by the Board to determine if any
adjustment is appropriate.  For purposes of paragraph l(f) and Section 3 herein,
Executive's annual salary shall not be less than $130,000.  So long as Executive
is employed by the Company or any of its Subsidiaries, the Executive shall also
be entitled to participate in such vacation pay and any other fringe benefit
plans as may from time to time be adopted by a majority of the Board.
 
          (e) Incentive Compensation.  In addition to the compensation set forth
              ----------------------                                            
in paragraph l(d) above, so long as the Executive is employed by the Company the
Executive shall be entitled to participate in a discretionary annual bonus plan
providing for the payment to Executive of an annual bonus, in an amount to be
determined by a majority of the Board or another officer of the Company as the
Board determines.  The annual bonus is discretionary in nature and is determined
in the exclusive discretion of the Board or other officer so designated by the
Board.  The Company may adopt from time to time a bonus program, in which the
Executive shall participate, the terms of which require the Company to achieve
certain performance goals which are set in advance each year in the sole
discretion of the Board.

          In addition to the discretionary bonus plan described above, Executive
will be entitled to participate in the current Stock Option Plan adopted by the
Board.

          (f) Severance Pay.  If at any time after the date hereof Executive
              -------------                                                 
ceases to be employed by the Company and its Subsidiaries ("Termination") for
death or disability or by the Company for any reason other than Cause, Executive
(or, in the case of death, Executive's estate) shall, until the end of the
Severance Pay Period (as defined below), be entitled to receive a salary at the
same rate of pay as, and on the same schedule and terms as was customary for,
the salary Executive received under paragraph l(d) above immediately prior to
the Termination, as well as (except in the case of Executive's death) comparable
medical benefits to those provided by the Company to Executive immediately prior
to the Termination (such salary and benefits collectively, the "Severance Pay");
provided that if at any time during the Severance Pay Period Executive obtains
other employment, Executive's Severance Pay shall during the period of such
employment be reduced (but not below zero) by the amount of salary and benefits
Executive receives as compensation for such employment.  The payment of such
Severance Pay shall in no way be construed as a continuation of Executive's
employment after the Termination.  The "Severance Pay 
                                        -------------

                                       2
<PAGE>
 
Period" shall be equal to the 12-month period commencing on the date of
- ------
Termination. If Executive resigns or is terminated by the Company for Cause, the
Company shall not be obligated to pay any Severance Pay.
 
          (g) Nondisclosure and Nonuse of Confidential Information.
              ---------------------------------------------------- 

              (i)   Nondisclosure Obligation. Executive shall not disclose or
                    ------------------------
use at any time, either during his employment with the Company or thereafter,
any Confidential Information (as defined below) of which Executive is or becomes
aware, whether or not such information is developed by him, except to the extent
that such disclosure or use is directly related to and required by Executive's
performance of duties assigned to Executive by the Company. Executive shall take
all appropriate steps to safeguard Confidential Information and to protect it
against disclosure, misuse, espionage, loss and theft.

              (ii)  Confidential Information.  As used in this Agreement, the
                    ------------------------                                 
term "Confidential Information" means information that is not generally known to
      ------------------------                                                  
the public and that is used, developed or obtained by the Company in connection
with its business, including but not limited to (i) products or services, (ii)
fees, costs and pricing structures, (iii) designs, (iv) analysis, (v) drawings,
photographs and reports, (vi) computer software, including operating systems,
applications and program listings, (vii) flow charts, manuals and documentation,
(viii) data bases, (ix) accounting and business methods, (x) inventions,
devices, new developments, methods and processes, whether patentable or
unpatentable and whether or not reduced to practice, (xi) customers and clients
and customer or client lists, (xii) copyrightable works, (xiv) all technology
and trade secrets, (xv) business plans and financial models, and (xvi) all
similar and related information in whatever form. Confidential Information shall
not include any information that has been published in a form generally
available to the public prior to the date Executive proposes to disclose or use
such information.  Information shall not be deemed to have been published merely
because individual portions of the information have been separately published,
but only if all material features constituting such information have been
published in combination.

          (h) Cause.  Cause means a finding by 2/3 of the Board members then
              -----                                                         
serving, after Executive has been given the opportunity for a formal hearing, of
(A) Executive's theft or embezzlement, or attempted theft or embezzlement, of
money or property of the Company, Executive's perpetration or attempted
perpetration of fraud, or Executive's participation in a fraud or attempted
fraud, on the Company, or Executive's unauthorized appropriation of, or attempt
to misappropriate, any tangible or intangible assets or property of the Company,
(B) any act or acts of disloyalty, misconduct or moral turpitude by Executive
injurious to the interest, property, operations, business or reputation of the
Company or Executive's conviction of a crime the commission of which results in
injury to the Company or (C) Executive's repeated refusal or failure (other than
by reason of disability) to carry out reasonable instructions by his superiors
or the Board.


                                       3
<PAGE>
 
     2.   The Company's Ownership of Intellectual Property.
          ------------------------------------------------ 

          (a) Acknowledgment of Company Ownership.  In the event that Executive
              -----------------------------------                              
as part of his activities on behalf of the Company generates, authors or
contributes to any invention, design, new development, device, product, method
or process (whether or not patentable or reduced to practice or constituting
Confidential Information), any copyrightable work (whether or not constituting
Confidential Information) or any other form of Confidential Information relating
directly or indirectly to the Company's business as now or hereinafter conducted
(collectively, "Intellectual Property"), Executive acknowledges that such
                ---------------------                                    
Intellectual Property is the exclusive property of the Company and hereby
assigns all right, title and interest in and to such Intellectual Property to
the Company.  Any copyrightable work prepared in whole or in part by Executive
will be deemed "a work made for hire" under Section 201(b) of the 1976 Copyright
Act, and the Company shall own all of the rights comprised by the copyright
therein.  Executive shall promptly and fully disclose all Intellectual Property
to the Company and shall cooperate with the Company to protect the Company's
interests in and rights to such Intellectual property (including, without
limitation, providing reasonable assistance in securing patent protection and
copyright registrations and executing all documents as reasonably requested by
the Company, whether such requests occur prior to or after Termination of
Executive's employment with the Company).

          (b) Executive Invention.  Executive understands that paragraph 2 of
              -------------------                                            
this Agreement regarding the Company's ownership of Intellectual Property does
not apply to any invention for which no equipment, supplies, facilities or trade
secret information of the Company were used and which was developed entirely on
Executive's own time, unless (i) the invention relates to the business of the
Company or to the Company's actual or demonstrably anticipated research or
development or (ii) the invention results from any work performed by Executive
for the Company.

          (c) Delivery of Materials upon Termination of Employment.  As
              ----------------------------------------------------     
requested by the Company from time to time and upon the Termination of
Executive's employment with the Company for any reason, Executive shall promptly
deliver to the Company all copies and embodiments, in whatever form, of all
Confidential Information and Intellectual Property in Executive's possession or
within his control (including, but not limited to, written records, notes,
photographs, manuals, notebooks, documentation, program listings, flow charts,
magnetic media, disks, diskettes, tapes and all other materials containing any
Confidential Information or Intellectual Property) irrespective of the location
or form of such material and, if requested by the Company shall provide the
Company with written confirmation that all such materials have been delivered to
the Company.

     3.   Noncompetition and Nonsolicitation.
          ---------------------------------- 

          (a) Noncompetition.  Executive acknowledges and agrees with the
              --------------                                             
Company that Executive's services to the Company are unique in nature and that
the Company would be irreparably damaged if Executive were to provide similar
services to any person or entity competing with the Company or engaged in a
similar business.  For and in consideration of the terms contained 

                                       4
<PAGE>
 
herein Executive covenants and agrees with the Company that during the
Noncompetition Period (as defined below), Executive shall not, directly or
indirectly, either for himself or for any other individual, corporation,
partnership, joint venture or other entity, participate in any business
division, group or franchise (or if there are no divisions, any business) where
such division, group or franchise (or business, if applicable) engages or
proposes to engage in any business conducted by the Company or proposed to be
conducted pursuant to a Board resolution or Subsequent Business Plan (including,
but not limited to, the sale or distribution of local switched dial tone
telecommunication services) in any metropolitan statistical area ("MSA") in
which the Company conducts such business or proposes to conduct such business
pursuant to a Board resolution or Subsequent Business Plan. For purposes of this
Agreement, the term "participate in" shall include, without limitation, having
any direct or indirect interest in any corporation, partnership, joint venture
or other entity, whether as a sole proprietor, owner, stockholder, partner,
joint venturer, creditor or otherwise, or rendering any direct or indirect
service or assistance to any individual, corporation, partnership, joint venture
and other business entity (whether as a director, officer, manager, supervisor,
employee, agent, consultant or otherwise), other than ownership of up to 2% of
the outstanding stock of any class which is publicly traded.

          (b) Nonsolicitation.  During the Noncompetition Period, Executive
              ---------------                                              
shall not (i) induce or attempt to induce any employee of the Company to leave
the employ of the Company, or in any way interfere with the relationship between
the Company and any employee thereof, (ii) hire directly or through another
entity any person who was an employee of the Company at any time during the
Noncompetition Period, or (iii) induce or attempt to induce any customer,
supplier, licensee or other business relation of the Company to cease doing
business with the Company, or in any way interfere with the relationship between
any such customer, supplier, licensee or business relation and the Company
(including, without limitation, making any negative statements or communications
concerning the Company).

          (c) Noncompetition Period.  The "Noncompetition Period" shall commence
              ---------------------        ---------------------                
on the date hereof and continue (i) if Executive is terminated by the Company
with or without Cause, until such date as shall be specified by the Company in
writing within the 14 days after Termination, provided that such date shall not
                                              --------                         
be later than the first anniversary of the Termination, or (ii) otherwise, until
such date as shall be specified by the Company in writing within the 30 days
after Termination, provided that such date shall not be later than the 12-month
                   --------                                                    
anniversary of the Termination. After the end of the Severance Pay Period (or if
there is no Severance Pay, the date upon which the Company elects the duration
of the Noncompetition Period), the Company shall until the end of the
Noncompetition Period pay Executive his Noncompete Compensation (unless
Executive breaches his obligations under this paragraph 3, it being understood
that in such case Executive shall continue to be bound by such obligations as if
the Company were continuing to pay Noncompete Compensation).  If there is no
Severance Pay, the Company shall during the period from Termination until such
time as the Company elects the duration of the Noncompetition Period (the
"Interim Period"), pay Executive his Interim Compensation (unless Executive
- ---------------                                                            
breaches his obligations under this paragraph 3, it being understood that in
such case Executive shall continue to be bound by such obligations as if the
Company were continuing to pay Interim Compensation). "Noncompete Compensation"
                                                       ----------------------- 
shall consist of 50% of the salary that Executive received under 


                                       5
<PAGE>
 
paragraph l(d) above as compensation from the Company and its Subsidiaries
immediately prior to termination (Executive's "Previous Salary") together with
                                               ---------------
the continuation of the medical benefits that the Company provided to Executive
immediately prior to Termination (Executive's "Previous Benefits"); provided
                                               -----------------    --------
that if at any time during the Noncompetition Period Executive obtains other
employment (i) with comparable medical benefits to Executive's Previous
Benefits, Executive's Noncompete Compensation shall during the period of such
employment not include the continued provision of medical benefits, and (ii)
with a salary exceeding 50% of Executive's Previous Salary, Executive's
Noncompete Compensation shall during the period of such employment be reduced
(but not below zero) by the amount of such excess. "Interim Compensation" shall
                                                    --------------------
consist of 100% of Executive's Previous Salary and Previous Benefits, provided
                                                                      --------
that if at any time during the Interim Period Executive obtains other
employment, Executive's Interim Compensation shall during the period of such
employment be reduced (but not less than zero) by the amount of salary and
benefits received as compensation for such other employment.

     4.   Notices.  Any notice provided for in this Agreement must be in writing
          -------                                                               
and must be either personally delivered, mailed by first class mail (postage
prepaid and return receipt requested) or sent by reputable overnight courier
service (charges prepaid) to the recipient at the address below indicated:

          To the Company:     Focal Communications Corporation
                              200 N. LaSalle Street, Suite 800
                              Chicago, Illinois 60601
                              Attention:  President

          To Executive:       Andrew K Robitshek
                              22 Second Street, Apt. 301
                              Sausalito, CA 94965
  
or to such other address or to the attention of such other person as the
recipient party shall have specified by prior written notice to the sending
party.  Any notice under this Agreement shall be deemed to have been given when
personally delivered, one business day after being sent by reputable overnight
courier service, or three business days after being deposited in the U.S. mail.

     5.   General Provisions.
          ------------------ 

          (a) Severability.  Whenever possible, each provision of this Agreement
              ------------                                                      
shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

                                       6
<PAGE>
 
          (b) Complete Agreement.  This Agreement, those documents expressly
              ------------------                                            
referred to herein and other documents of even date herewith embody the complete
agreement and understanding among the parties and supersede and preempt any
prior understandings, agreements or representations by or among the parties,
written or oral, which may have related to the subject matter hereof in any way.

          (c) Counterparts.  This Agreement may be executed in separate
              ------------                                             
counterparts, none of which need contain the signature of more than one party
hereto but each of which shall be deemed to be an original and all of which
taken together shall constitute one and the same agreement.

          (d) Successors and Assigns.  Except as otherwise provided herein, this
              ----------------------                                            
Agreement shall bind the parties hereto and their respective successors and
assigns and shall inure to the benefit of and be enforceable by the parties
hereto and their respective successors and assigns.

          (e) Choice of Law.  All questions concerning the construction,
              -------------                                             
validity, enforcement and interpretation of this Agreement and the exhibits
hereto shall be governed by the laws of the State of California.

          (f) Remedies.  Each of the parties to this Agreement (including the
              --------                                                       
Investors shall be entitled to enforce its rights under this Agreement
specifically, to recover damages and cost (including reasonable attorney's fees)
caused by any breach of any provision of this Agreement and to exercise all
other rights existing in its favor.  The parties hereto agree and acknowledge
that, money damages would not be an adequate remedy for any breach of the
provisions of this Agreement and that any party may in its sole discretion apply
to any court of law or equity of competent jurisdiction (without posting any
bond or deposit) for specific performance and/or other injunctive relief in
order to enforce or prevent any violations of the provisions of this Agreement.

          (g) Amendment and Waiver.  The provisions of this Agreement may be
              --------------------                                          
amended and waived only with the prior written consent of the Company and
Executive.

          (h) Business Days.  If any time period for giving notice or taking
              -------------                                                 
action hereunder expires on a day which is a Saturday, Sunday or legal holiday
in the State of Illinois, the time period shall be automatically extended to the
business day immediately following such Saturday, Sunday or holiday.

                           *     *     *     *     *

                                       7
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Agreement on the
date first written above.


                    FOCAL COMMUNICATIONS CORPORATION
                    OF CALIFORNIA


                    By   /s/ John R. Barnicle
                      -----------------------------
                    Its: E.V.P. - C.O.O.
                        ---------------------------


                    EXECUTIVE:

                    /s/ Andrew K. Robitshek
                    -------------------------------
                    Andrew K. Robitshek


                                       8

<PAGE>
 
                                                                    Exhibit 23.1



                   Consent of Independent Public Accountants


          As independent public accountants, we hereby consent to the use of our
report (and to all references to our firm) included in or made a part of 
Registration Statement File No. 333-49397.


                                       /s/ Arthur Andersen LLP
                                       
                                       ARTHUR ANDERSEN LLP

Chicago, Illinois
July 31, 1998




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