EXCEL SWITCHING CORP
8-K, 1999-05-25
COMMUNICATIONS EQUIPMENT, NEC
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

          Date of Report (Date of earliest event reported) May 10, 1999


                           EXCEL SWITCHING CORPORATION
             (Exact name of registrant as specified in its charter)


                                  MASSACHUSETTS
                 ----------------------------------------------
                 (State or other jurisdiction of incorporation)


         0-23263                                           04-2992806
 ------------------------                      ---------------------------------
 (Commission File Number)                      (IRS Employer Identification No.)



                             255 INDEPENDENCE DRIVE
                          HYANNIS, MASSACHUSETTS 02601
              -----------------------------------------------------
                    (Address of principal executive offices)

                    Registrant's telephone number, including
                                   area code:

                                 (508) 862-3000
                                 --------------

<PAGE>

ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS.

         On May 10, 1999, Racepoint Acquisition Corp.("Racepoint"), a
wholly-owned subsidiary of Excel Switching Corporation ("Excel"), merged (the
"Merger") with and into RAScom, Inc. ("RAScom"). As a result of the Merger,
RAScom became a wholly-owned subsidiary of Excel.

         RAScom's assets consist primarily of its open remote access server
technology including the RAServer product line which concurrently supports
access over both the public switched telephony networks and the internet. Prior
to the Merger, RAScom designed and manufactured a remote access solution based
on open platforms for enterprise networks, carriers and internet software
providers ("ISPs"). Excel intends to integrate RAScom's remote access server
technology with Excel's programmable switching technology for the enhanced
services and wireless and infrastructure markets, as well as for small and
medium sized ISPs.

         Pursuant to the terms of the Merger, an aggregate of 1,099,940 shares
of Excel's common stock (the "Common Stock") were issued in exchange for all of
the outstanding capital stock and options to purchase capital stock of RAScom.
The shareholders of RAScom received, in the aggregate, 1,021,187 shares of
Excel's Common Stock in exchange for their shares of RAScom capital stock. In
addition, the optionholders of RAScom received, in the aggregate, options to
purchase 78,753 shares of Excel's Common Stock in exchange for their options to
purchase capital stock of RAScom. The source of the consideration for this
acquisition came from the authorized capital stock of Excel, and to the extent
that cash was paid for fractional shares, from Excel's cash on hand.

         The terms of this transaction and the consideration received by RAScom
shareholders and option holders were the result of arm's-length negotiations
between management of Excel, management of RAScom and the shareholders of
RAScom. The terms of this transaction and the exchange of RAScom securities for
the Common Stock are more fully described in the Agreement and Plan of Merger
and Reorganization (the "Merger Agreement"), dated as of April 15, 1999, as
amended, among Excel, Racepoint, RAScom, the shareholders of RAScom and Mark B.
Galvin as Indemnification Representative (attached as Exhibit 2.1 to this report
and hereby incorporated by reference). Additional terms are also provided in
Amendment No. 1 to the Merger Agreement ("Amendment No. 1 to the Merger
Agreement"), dated as of May 7, 1999, among Excel, Racepoint, RAScom, those
shareholders of RAScom that are signatories thereto, and Mark B. Galvin as
Indemnification Representative (attached as Exhibit 2.2 to this report and
hereby incorporated by reference).

         Of the 1,021,187 shares of Common Stock issued in the Merger to the
RAScom shareholders, 102,122 shares were placed in escrow pursuant to the terms
of an Escrow Agreement (the "Escrow Agreement"), dated as of May 10, 1999, by
and among Excel, Racepoint, RAScom, State Street Bank and Trust Company ("State
Street"), the shareholders of RAScom, and Mark B. Galvin as Indemnification
Representative (attached as Exhibit 4.1 to this report and hereby incorporated
by reference). Additional terms related to the escrow of Excel Common Stock
issued in the Merger is also provided in a Side Letter Agreement (the "Side
Letter Agreement"), dated as of May 10, 1999 by and among Excel, Racepoint,
RAScom, State Street and Mark B.

                                       -2-

<PAGE>

Galvin as Indemnification Representative (attached as Exhibit 4.2 to this report
and hereby incorporated by reference).

         Shareholders of RAScom that obtained Common Stock of Excel in the
Merger are also entitled to certain registration rights as detailed in the
Registration Rights Agreement (the "Registration Rights Agreement"), dated as of
May 10, 1999, between the various shareholders of RAScom and Excel (attached as
Exhibit 4.3 to this report and hereby incorporated by reference).

         The Merger was approved by the Board of Directors of Excel, Racepoint
and RAScom, and in addition, by the shareholders of RAScom. This transaction
will be accounted for as a pooling of interests.

         The information contained in the press release of Excel, dated May 11,
1999, announcing the consummation of the Merger, and which is attached to this
report as Exhibit 99.1, is also hereby incorporated by reference. The
information contained in the press release of Excel, dated April 15, 1999,
announcing the acquisition of RAScom by Excel, and reported on a Form 8-K filed
with the Commission on April 23, 1999, is also hereby incorporated by reference.


FACTORS THAT MAY AFFECT FUTURE OPERATING RESULTS

         Statements contained in this Report on Form 8-K that are not historical
fact may constitute forward-looking statements and are made under the safe
harbor provisions of the Private Securities Litigation Reform Act of 1995.
Excel's actual results of operations and financial condition may in the future
vary significantly from those stated in any forward-looking statements. Factors
that may cause such differences include, but are not limited to, the risks,
uncertainties and other information discussed within this Report on Form 8-K and
other risks identified in Excel's Securities and Exchange Commission filings.

         The following factors, among others, could cause actual results to
differ materially from those set forth in forward-looking statements contained
or incorporated by reference in this report and presented by management from
time to time. Such factors, among others, may have a material adverse effect
upon Excel's business, results of operations and financial condition:

         Difficulty of Integrating Two Companies. In connection with Excel's
acquisition of RAScom, Inc., the successful integration of the operations,
personnel and product lines of the two companies is important to the future
financial performance of the combined enterprise. The anticipated benefits of
the acquisition may not be achieved unless, among other things, the operations
of RAScom are successfully combined with those of Excel in a timely manner. The
diversion of the attention of management, and any difficulties encountered in
the transition process, could have an adverse impact on the revenues, financial
condition and results of operations of the combined enterprise. Excel may not be
able to successfully integrate RAScom and its services and products into Excel's
operations. The inability of management to successfully integrate the operations
of the companies could have a material adverse effect upon the business,
financial condition and results of operations of Excel.

                                       -3-

<PAGE>

         Difficulty of Integrating RAScom Product Lines. As part of its product
plans following the acquisition of RAScom, Excel expects to be integrating
RAScom's remote access technology with Excel's programmable switching technology
for the enhanced services and wireless and infrastructure markets, as well as
for small- and medium-sized Internet Service Providers. The integration by Excel
of RAScom's product offerings can be costly, and result in unanticipated delays
or difficulties with product integration, and require further development
expenses and further expenditures for sales and marketing campaigns associated
with advertising the new, complementary product offerings. There is no assurance
that the RAScom research and development team can be successfully assimilated
with Excel's engineering personnel, or that the RAScom engineering personnel
will continue to remain with Excel following the acquisition. Excel has no
assurance that its existing customers will purchase the new RAScom product
lines, once integrated, or that Excel will be able to attract new customers with
the added RAScom product capabilities. While management believes that RAScom's
technology enhances Excel's existing product offerings and expands its
addressable markets, delays or difficulties associated with this product
integration or the loss of RAScom engineering personnel could have a material
adverse effect on Excel's business and results of operations.

         Uncertainties Relating to Integration of Operations. Excel believes
that the acquisition of RAScom will result in long-term strategic benefits.
However, the realization of these benefits will depend on whether management can
integrate the operations of Excel and RAScom in an efficient and effective
manner. Among other things, Excel must integrate the respective companies'
products, technologies, distribution channels and key personnel. Furthermore,
Excel must coordinate the sales, marketing and research and development efforts
of RAScom. The difficulties of integrating RAScom may be increased by the need
to coordinate organizations with distinct cultures and widely dispersed
operations. The effective integration of the various operations will depend on
the ability of Excel to attract and retain key management, sales, marketing and
research and development personnel. The integration of operations following the
acquisition will require significant attention of management and thus may
distract attention from other day-to-day operations of Excel.

         Need to Integrate and Retain Key Employees of RAScom. The successful
integration of RAScom, Inc. is dependent on the retention and integration of the
key management, sales, marketing, engineering and other technical employees of
RAScom. Competition for qualified personnel in the industries in which Excel and
RAScom compete is very intense, and competitors may use aggressive tactics to
recruit key employees of Excel and RAScom during the integration phase following
the acquisition which could result in the loss of key employees. The loss of
these key personnel could have a material adverse effect on Excel's business,
financial condition and results of operations.


ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.

(a)      Financial Statements of Business Acquired. Pursuant to Instruction
         (a)(4) of Item 7 of Form 8-K, financial statements of RAScom, Inc. will
         be filed not later than 60 days after May 25, 1999, the date that this
         initial report on Form 8-K must be filed.

                                       -4-

<PAGE>

(b)      Pro Forma Financial Information. Pursuant to Instruction (b)(2) of Item
         7 of Form 8-K, pro forma financial information relating to RAScom, Inc.
         will be filed not later 60 days after May 25, 1999, the date that this
         initial report on Form 8-K must be filed.

(c)      Exhibits.

         Exhibit No.            Description
         -----------            -----------

                 2.1            Agreement and Plan of Merger and Reorganization
                                dated as of April 15, 1999, by and among Excel
                                Switching Corporation, Racepoint Acquisition
                                Corp., RAScom, Inc., the shareholders of RAScom,
                                Inc. and Mark B. Galvin as Indemnification
                                Representative.
                 2.2            Amendment No. 1 to the Agreement and Plan of
                                Merger and Reorganization dated as of May 7,
                                1999, by and among Excel Switching Corporation,
                                Racepoint Acquisition Corp., RAScom, Inc., those
                                shareholders of RAScom, Inc. that are
                                signatories thereto, and Mark B. Galvin as
                                Indemnification Representative.
                 4.1            Escrow Agreement dated as of May 10, 1999, by
                                and among Excel Switching Corporation, Racepoint
                                Acquisition Corp., RAScom, Inc., State Street
                                Bank and Trust Company, the shareholders of
                                RAScom, Inc. and Mark B. Galvin as
                                Indemnification Representative.
                 4.2            Side Letter Agreement dated as of May 10, 1999
                                by and among Excel Switching Corporation,
                                Racepoint Acquisition Corp., RAScom, Inc., State
                                Street Bank and Trust Company and Mark B. Galvin
                                as Indemnification Representative.
                 4.3            Registration Rights Agreement, dated as of May
                                10, 1999, between the shareholders of RAScom
                                that are signatories thereto and Excel Switching
                                Corporation.
                 99.1           Press Release of Excel Switching Corporation,
                                dated May 11, 1999, announcing the consummation
                                of the Merger.
                 99.2           Press Release of Excel Switching Corporation
                                dated April 15, 1999 announcing the acquisition
                                of RAScom, Inc. by Excel Switching Corporation
                                (incorporated by reference to Exhibit 99.1 of
                                the Report on Form 8-K filed by Excel Switching
                                Corporation with the Commission on April 23,
                                1999).

                                       -5-

<PAGE>

                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                         EXCEL SWITCHING CORPORATION


Dated:  May 25, 1999                     By: /s/ Christopher Stavros
                                            ------------------------------------
                                             Christopher Stavros
                                             Vice President and General Counsel

                                       -6-

<PAGE>

                                  EXHIBIT INDEX
                                  -------------

Exhibit No.          Description
- -----------          -----------

        2.1          Agreement and Plan of Merger and Reorganization dated as of
                     April 15, 1999, by and among Excel Switching Corporation,
                     Racepoint Acquisition Corp., RAScom, Inc., the shareholders
                     of RAScom, Inc. and Mark B. Galvin as Indemnification
                     Representative.
        2.2          Amendment No. 1 to the Agreement and Plan of Merger and
                     Reorganization dated as of May 7, 1999, by and among Excel
                     Switching Corporation, Racepoint Acquisition Corp., RAScom,
                     Inc., those shareholders of RAScom, Inc. that are
                     signatories thereto, and Mark B. Galvin as Indemnification
                     Representative.
        4.1          Escrow Agreement dated as of May 10, 1999, by and among
                     Excel Switching Corporation, Racepoint Acquisition Corp.,
                     RAScom, Inc., State Street Bank and Trust Company, the
                     shareholders of RAScom, Inc. and Mark B. Galvin as
                     Indemnification Representative.
        4.2          Side Letter Agreement dated as of May 10, 1999 by and among
                     Excel Switching Corporation, Racepoint Acquisition Corp.,
                     RAScom, Inc., State Street Bank and Trust Company and Mark
                     B. Galvin as Indemnification Representative.
        4.3          Registration Rights Agreement, dated as of May 10, 1999,
                     between the shareholders of RAScom that are signatories
                     thereto and Excel Switching Corporation.
        99.1         Press Release of Excel Switching Corporation, dated May 11,
                     1999, announcing the consummation of the Merger.
        99.2         Press Release of Excel Switching Corporation dated April
                     15, 1999 announcing the acquisition of RAScom, Inc. by
                     Excel Switching Corporation (incorporated by reference to
                     Exhibit 99.1 of the Report on Form 8-K filed by Excel
                     Switching Corporation with the Commission on April 23,
                     1999).

                                       -7-


                                                                     EXHIBIT 2.1
                                                                     -----------


                 AGREEMENT AND PLAN OF MERGER AND REORGANIZATION


                                  BY AND AMONG


                           EXCEL SWITCHING CORPORATION


                           RACEPOINT ACQUISITION CORP.


                                  RASCOM, INC.

                                       AND

             THOSE SHAREHOLDERS LISTED ON THE SIGNATURE PAGE HERETO

                           Dated as of APRIL 15, 1999








<PAGE>

                 AGREEMENT AND PLAN OF MERGER AND REORGANIZATION
                                TABLE OF CONTENTS
<TABLE>
                                                                                                               Page
                                                                                                               ----
<S>                                                                                                              <C>
ARTICLE I.........................................................................................................1

   SECTION 1.1  THE MERGER........................................................................................1
   SECTION 1.2  EFFECTIVE TIME....................................................................................1
   SECTION 1.3  EFFECTS OF THE MERGER.............................................................................1
   SECTION 1.4  DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION...............................................1
   SECTION 1.5  WRITTEN CONSENT OF THE SHAREHOLDERS OF THE COMPANY................................................2
   SECTION 1.6  CLOSING; CONSUMMATION OF THE MERGER...............................................................2
   SECTION 1.7  TERMINATION OF COMPANY STOCKHOLDERS AGREEMENT.....................................................2

ARTICLE II........................................................................................................3

   SECTION 2.1  CONVERSION OF COMPANY SHARES......................................................................3
   SECTION 2.2  DELIVERY OF MERGER CONSIDERATION..................................................................5
   SECTION 2.3  DISSENTING COMPANY SHARES.........................................................................6
   SECTION 2.4  NO FRACTIONAL SHARES..............................................................................7
   SECTION 2.5  ADJUSTMENTS.......................................................................................7
   SECTION 2.6  STOCK OPTIONS.....................................................................................7

ARTICLE III.......................................................................................................8

   SECTION 3.1  ORGANIZATION AND QUALIFICATION....................................................................8
   SECTION 3.2  CAPITALIZATION....................................................................................8
   SECTION 3.3  AUTHORITY RELATIVE TO THIS AGREEMENT..............................................................8
   SECTION 3.4  NON-CONTRAVENTION.................................................................................9
   SECTION 3.5  REPORTS AND FINANCIAL STATEMENTS..................................................................9
   SECTION 3.6  VALIDITY OF PARENT COMMON STOCK..................................................................10
   SECTION 3.7  CONSENTS AND APPROVALS OF GOVERNMENTAL AUTHORITIES...............................................10
   SECTION 3.8  LITIGATION.......................................................................................10
   SECTION 3.9  UNDISCLOSED LIABILITIES..........................................................................10
   SECTION 3.10  INTELLECTUAL PROPERTY...........................................................................10

ARTICLE IV.......................................................................................................11

   SECTION 4.1  ORGANIZATION AND QUALIFICATION...................................................................11
   SECTION 4.2  CAPITALIZATION...................................................................................11
   SECTION 4.3  SUBSIDIARIES.....................................................................................12
   SECTION 4.4  AUTHORITY RELATIVE TO THIS AGREEMENT.............................................................13
   SECTION 4.5  NON-CONTRAVENTION................................................................................13
   SECTION 4.6  REQUIRED AND OTHER CONSENTS......................................................................14
   SECTION 4.7  FINANCIAL STATEMENTS AND REPORTS.................................................................14
   SECTION 4.8  TITLE TO PROPERTIES AND ASSETS...................................................................15
   SECTION 4.9  ABSENCE OF CERTAIN CHANGES OR EVENTS.............................................................15
   SECTION 4.10  DISCLOSURE OF LIABILITIES.......................................................................17
   SECTION 4.11  ACCOUNTS, NOTES AND RECEIVABLES.................................................................17
</TABLE>

<PAGE>
<TABLE>
<S>                                                                                                              <C>
   SECTION 4.12  LITIGATION......................................................................................18
   SECTION 4.13  AGREEMENTS......................................................................................18
   SECTION 4.14  LICENSES AND PERMITS............................................................................19
   SECTION 4.15  INTELLECTUAL PROPERTY...........................................................................20
   SECTION 4.16  EMPLOYEES.......................................................................................22
   SECTION 4.17  ENFORCEABILITY OF CONTRACTS, ETC................................................................23
   SECTION 4.18 TAXES............................................................................................24
   SECTION 4.19  INSURANCE.......................................................................................26
   SECTION 4.20  BOOKS AND RECORDS...............................................................................26
   SECTION 4.21  COMPLIANCE WITH GOVERNMENTAL REGULATIONS........................................................26
   SECTION 4.22  ENVIRONMENTAL COMPLIANCE........................................................................27
   SECTION 4.23  FIRE, FLOOD, ACCIDENT, ETC......................................................................27
   SECTION 4.24  REAL ESTATE.....................................................................................27
   SECTION 4.25  BANK ACCOUNTS...................................................................................27
   SECTION 4.26  EMPLOYEE BENEFIT PLANS..........................................................................28
   SECTION 4.27  CONSENTS AND APPROVALS OF GOVERNMENTAL AUTHORITIES..............................................28
   SECTION 4.28  CONFLICTS OF INTEREST...........................................................................28
   SECTION 4.29  ACCURACY OF REPRESENTATIONS.....................................................................28
   SECTION 4.30  INFORMATION STATEMENT...........................................................................29

ARTICLE IV-A.....................................................................................................29

ARTICLE V........................................................................................................30

   SECTION 5.1  CONDUCT OF BUSINESS BY THE COMPANY PENDING THE MERGER............................................30
   SECTION 5.2  ACCESS AND INFORMATION; CONFIDENTIALITY..........................................................32
   SECTION 5.3  REASONABLE EFFORTS...............................................................................33
   SECTION 5.4  NO SOLICITATION..................................................................................33
   SECTION 5.5  PUBLIC ANNOUNCEMENTS.............................................................................33
   SECTION 5.6  INSURANCE........................................................................................34
   SECTION 5.7  POOLING..........................................................................................34
   SECTION 5.8  SHAREHOLDER APPROVAL.............................................................................34
   SECTION 5.9  RESALE REGISTRATION STATEMENTS...................................................................34
   SECTION 5.10  REQUIRED NOTIFICATION...........................................................................34

ARTICLE VI.......................................................................................................35

   SECTION 6.1  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.......................................35
   SECTION 6.2  CONDITIONS TO OBLIGATION OF THE COMPANY AND THE COMPANY SHAREHOLDERS TO EFFECT THE MERGER........35
   SECTION 6.3  CONDITIONS TO OBLIGATIONS OF PARENT AND MERGER SUB TO EFFECT THE MERGER..........................37

ARTICLE VII......................................................................................................39

   SECTION 7.1  SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS............................................39

ARTICLE VIII.....................................................................................................40

   SECTION 8.1  TERMINATION......................................................................................40
   SECTION 8.2  EFFECT OF TERMINATION............................................................................41
</TABLE>
                                      -ii-
<PAGE>
<TABLE>
<S>                                                                                                              <C>
   SECTION 8.3  AMENDMENT........................................................................................41
   SECTION 8.4  WAIVER...........................................................................................41

ARTICLE IX.......................................................................................................41

   SECTION 9.1  BROKERS..........................................................................................41
   SECTION 9.2  NOTICES..........................................................................................42
   SECTION 9.3  SUBSIDIARIES.....................................................................................42
   SECTION 9.4  HEADINGS.........................................................................................43
   SECTION 9.5  ENTIRE AGREEMENT; ASSIGNMENT.....................................................................43
   SECTION 9.6  PARTIES IN INTEREST..............................................................................43
   SECTION 9.7  VALIDITY.........................................................................................43
   SECTION 9.8  COUNTERPARTS.....................................................................................43
   SECTION 9.9  EXPENSES.........................................................................................43
   SECTION 9.10 GOVERNING LAW....................................................................................44

</TABLE>

SIGNATURES

EXHIBITS

EXHIBIT A   Certificate of Merger

EXHIBIT B   Form of Escrow Agreement

EXHIBIT C   Form of Opinion to be Issued by Testa, Hurwitz & Thibeault, LLP

EXHIBIT D   Form of Registration Rights Agreement

EXHIBIT E   Form of Opinion to be Issued by Foley, Hoag & Eliot LLP

EXHIBIT F   Form of Employee Non Disclosure, Invention & Covenant Not to
            Compete Agreement

EXHIBIT G   Form of Representation by President or Chief Financial Officer

                                     -iii-
<PAGE>

                 AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

         Agreement and Plan of Merger and Reorganization, dated as of April 15,
1999, by and among Excel Switching Corporation, a Massachusetts corporation
("PARENT"), Racepoint Acquisition Corp., a Delaware corporation and a
wholly-owned subsidiary of Parent ("MERGER SUB"), RAScom, Inc., a Delaware
corporation (the "COMPANY"), those certain shareholders of the Company set forth
on the signature pages hereto, and Mark B. Galvin (the "INDEMNIFICATION
REPRESENTATIVE").

                                    ARTICLE I

                                   THE MERGER

         SECTION 1.1 THE MERGER. Subject to the terms and conditions hereof, and
in accordance with the Delaware General Corporation Law (the "DCL"), Merger Sub
will be merged with and into the Company (the "MERGER"), as soon as practicable
following the satisfaction or waiver of the conditions set forth in Article VI
hereof. Following the Merger, the Company shall continue as the surviving
corporation (the "SURVIVING CORPORATION") under the laws of the State of
Delaware and the separate corporate existence of Merger Sub shall cease.

         SECTION 1.2 EFFECTIVE TIME. The Merger shall become effective upon the
filing of a duly executed Certificate of Merger substantially in the form of
Exhibit A hereto (the "CERTIFICATE OF MERGER") with the Secretary of State of
the State of Delaware (the date and time of such filing being hereinafter
referred to as the "EFFECTIVE TIME").

         SECTION 1.3 EFFECTS OF THE MERGER. The Merger shall have the effects
set forth in Section 259 of the DCL. As of the Effective Time, the Company shall
be a wholly-owned subsidiary of Parent. The Merger is intended to be a
reorganization within the meaning of Section 368(a) of the Internal Revenue Code
of 1986, as amended (the "CODE").

         SECTION 1.4 CERTIFICATE OF INCORPORATION; BY-LAWS; DIRECTORS AND
OFFICERS OF THE SURVIVING CORPORATION. The Certificate of Incorporation of the
Surviving Corporation (other than Article First thereof) shall, from and after
the Effective Time, be as set forth in the Certificate of Incorporation of
Company as in effect immediately prior to the Effective Time until changed as
permitted by law or by such Certificate of Incorporation. The By-laws of the
Surviving Corporation shall, from and after the Effective Time, be the by-laws
of the Merger Sub as in effect immediately prior to the Effective Time until
changed as permitted by law, by the Certificate of Incorporation of the
Surviving Corporation or by such By-laws. At the Effective Time, each director
of the Company shall cease to hold such office, and the directors of the
Surviving Corporation shall be the directors of Merger Sub immediately prior to
the Effective Time, each of whom shall hold such office until the next annual
meeting of shareholders of the Surviving Corporation and until his or her
successor shall have been elected or appointed and qualified to serve, or
otherwise as provided in the Certificate of Incorporation or By-laws of the
Surviving Corporation. At the Effective Time, the officers of Merger Sub
immediately prior to


<PAGE>

the Effective Time shall be the officers of the Surviving Corporation, in the
same capacity or capacities, to serve until his or her successor shall have been
duly elected and qualified to serve.

         SECTION 1.5 WRITTEN CONSENT OF THE SHAREHOLDERS OF THE COMPANY. The
Company will take all action necessary in accordance with applicable law and its
Restated Certificate of Incorporation and By-laws to solicit from each holder of
capital stock of the Company outstanding on the date of this Agreement the
approval of this Agreement, the Merger and all the transactions contemplated
hereby, by the shareholders of the Company, by means of a Written Consent of
Shareholders (the "COMPANY'S SHAREHOLDERS' CONSENT"). The record date set for
such solicitation shall be the date of this Agreement. The Company shall use its
best efforts to obtain such shareholder approval. The Company represents and
warrants that its Board of Directors, at a meeting duly called and held, has (i)
approved the Merger and this Agreement and declared its advisability and (ii)
resolved to recommend to the shareholders of the Company that they adopt this
Agreement, the Merger and all the transactions contemplated hereby.

         SECTION 1.6 CLOSING; CONSUMMATION OF THE MERGER. The closing of the
transactions contemplated by this Agreement (the "CLOSING") shall take place:
(a) at the offices of Testa, Hurwitz & Thibeault, LLP, High Street Tower, 125
High Street, Boston, Massachusetts 02110, on or before May 15, 1999, or (b) at
such other date and place as Parent and the Company may agree. The date of the
Closing, determined pursuant to this Section 1.6, is hereinafter referred to as
the "CLOSING DATE." If all conditions set forth in Article VI hereof are
determined to be satisfied (or duly waived) at the Closing, as soon as
practicable the parties hereto will cause the Merger to be consummated by the
filing of the Certificate of Merger with the Secretary of State of the State of
Delaware, in such form as required by and executed in accordance with the
requirements of the DCL, and the Closing shall be consummated.

         SECTION 1.7 TERMINATION OF COMPANY STOCKHOLDERS AGREEMENT. The
shareholders of the Company executing this Agreement are parties to that certain
Amended and Restated Stockholders Agreement dated as of August 22, 1997 by and
among the Company and certain of its stockholders (the "Company Stockholders
Agreement"). By execution and delivery of this Agreement, such shareholders
constituting a sufficient percentage of the shares held by all of the parties to
the Company Stockholders Agreement as well as each other person required to take
such action, agree that, as of the Effective Time, the Company Stockholders
Agreement shall be terminated in accordance with Section 12 thereof and shall be
of no further force and effect.


                                   ARTICLE II

           CONVERSION OF SHARES; EXCHANGE OF SHARES; DISSENTING SHARES

         SECTION 2.1  CONVERSION OF COMPANY SHARES.

                  (a) Subject, without limitation, to the provisions of Section
2.2 hereof, at the Effective Time, (i) all of the shares of common stock, $.001
par value per

                                      -2-
<PAGE>

share, of the Company (the "COMPANY COMMON STOCK") issued and outstanding
immediately prior to the Effective Time and each share of Series A Convertible
Redeemable Preferred Stock, $0.001 par value per share (including Series A-1
Preferred Stock and Series A-2 Preferred Stock), Series B Convertible Redeemable
Preferred Stock, $0.001 par value per share (including Series B-1 Preferred
Stock) and Series C Convertible Redeemable Preferred Stock, $0.001 par value per
share (collectively, the "PREFERRED STOCK") issued and outstanding immediately
prior to the Effective Time, (together, the "COMPANY SHARES") (excluding any
Company Shares held by Parent or Merger Sub or any other subsidiary of Parent or
by the Company, which shares shall be canceled in the Merger, and Dissenting
Company Shares (as defined in Section 2.3 hereof)) shall automatically, by
virtue of the Merger and without any action on the part of the holder thereof,
be converted into shares of common stock, $.01 par value per share, of Parent
(the "PARENT COMMON STOCK") in accordance with Sections 2.1(c) and (d) (rounded
down to the nearest whole share), and cash (rounded to the nearest whole cent)
in lieu of fractional shares, if any, pursuant to Section 2.4 below, and (ii)
all Outstanding Options (as defined in Section 2.6 hereof) shall be assumed by
Parent and shall automatically, by virtue of the Merger and without any action
on the part of the holder thereof, be converted into options to purchase shares
of Parent Common Stock in accordance with Section 2.6 (such Parent Common Stock
and cash being referred to herein as the "MERGER CONSIDERATION").

                  (b) The number of shares of Parent Common Stock to be issued
in exchange for the acquisition of all Company Shares and Outstanding Options
(as defined in Section 2.6 hereof) shall be One Million One Hundred Thousand
(1,100,000) shares, provided that such number shall be adjusted to the extent
required by Section 2.5 herein. Such number of shares is herein referred to as
the "CONSIDERATION SHARES". The Consideration Shares shall be delivered in
exchange for all outstanding shares of capital stock of the Company of any kind,
class or series, and all securities convertible or exchangeable for any class or
series of capital stock, including all options, warrants, convertible
securities, purchase rights or commitments, accrued, declared or cumulative
dividends, and whether such rights or securities are vested or unvested,
exercisable or unexercisable, accrued or contingent. Parent shall not be
obligated to deliver any Parent Common Stock in excess of the Consideration
Shares.

                  (c) Allocation of the Consideration Shares shall be as set
forth in the Parent Disclosure Schedule, which amounts were determined according
to the following formulae: The number of shares of Parent Common Stock to be
issued in exchange for the acquisition of all the shares of each series of
Preferred Stock shall be equal to (i) the aggregate Liquidation Amount payable
in respect of such series of Preferred Stock as of the Effective Time,
determined in accordance with Section (A)(4)(a) of Article Fourth of the
Restated Certificate of Incorporation of the Company, divided by (ii) $25.64375,
which represents the ten (10) trading day average of the closing sale price per
share of the Parent Common Stock on the Nasdaq National Market from March 15,
1999 through March 26, 1999, which has been determined by the Board of Directors
of the Company to be the fair market value of the Parent Common Stock for
purposes of Section (A)(4)(c) of such Restated Certificate of Incorporation. The
aggregate number of shares of Parent Common Stock to be issued in exchange for
all the Preferred Stock may hereinafter be referred to as the "Preferred
Consideration Shares" and the total number of Consideration Shares less the
number of Preferred Consideration Shares may hereinafter be referred to as the
"Common Consideration Shares." Subject to Section 2.4 below, each holder of
shares of a series of Preferred Stock shall be entitled to receive that number
of shares of Parent Common Stock equal to the product of the number of shares of
such series of Preferred Stock


                                      -3-
<PAGE>

held by such holder multiplied by the quotient of (x) the aggregate number of
Preferred Consideration Shares issuable in respect of such series divided by (y)
the aggregate number of shares of such series issued and outstanding at the
Effective Time.

                  (d) The ratio at which each share of Company Common Stock and
each Outstanding Option will be converted into shares of Parent Common Stock at
the Effective Time is herein called the "CONVERSION RATIO" and shall be
calculated as set forth in this Section 2.1(d). Subject to Section 2.4, at the
Effective Time, each share of Company Common Stock and each Outstanding Option
shall be converted into the right to receive that number (which may be a
fraction) of shares of Parent Common Stock that equals the quotient (rounded to
the fifth decimal place) obtained by dividing the Common Consideration Shares
(as may be adjusted pursuant to Section 2.5) by the sum of the number of shares
of Company Common Stock outstanding immediately prior to the Effective Time and
the number of shares of Company Common Stock issuable upon exercise in full of
all Outstanding Options. Each holder of Company Common Stock (each, a "COMPANY
COMMON SHAREHOLDER") shall be entitled to receive that aggregate number of
shares of Parent Common Stock equal to the Conversion Ratio multiplied by the
number of shares of Company Common Stock held by such holder immediately prior
to the Effective Time, subject to Section 2.4 herein.

                  (e) As of the Effective Time, all Company Shares shall no
longer be outstanding and shall automatically be canceled and retired and shall
cease to exist, and each holder of a certificate representing any such Company
Shares (each a "Company Shareholder") shall cease to have any rights with
respect thereto, except the right to receive the Merger Consideration in respect
thereof. Each holder of Outstanding Options shall be entitled to receive an
option to purchase shares of Parent Common Stock as determined pursuant to
Section 2.6 hereof.

                  (f) At the Effective Time, each Company Share held by the
Company shall automatically, by virtue of the Merger, be retired and returned to
the status of authorized and unissued shares of capital stock of the Company
without payment of any consideration therefor and without any conversion
thereof.

                  (g) At the Effective Time, each Company Share held by Parent
or Merger Sub or any other subsidiary of Parent shall automatically, by virtue
of the Merger, be canceled without payment of any consideration therefor and
without any conversion thereof.

                  (h) At the Effective Time, each share of common stock, $.01
par value per share, of Merger Sub issued and outstanding immediately prior to
the Effective Time shall, by virtue of the Merger and without any action on the
part of the holder hereof, be converted into one share of common stock, $.01 par
value per share, of the Surviving Corporation.

         SECTION 2.2  DELIVERY OF MERGER CONSIDERATION.

                  (a) Promptly after the Effective Time, Parent, on behalf of
the Surviving Corporation, shall deliver certificates to State Street Bank and
Trust Company (the "INDEMNIFICATION ESCROW AGENT") and the holders of Company
Shares representing the shares

                                      -4-
<PAGE>

of Parent Common Stock and the cash (in immediately available funds) to which
holders of Company Shares shall be entitled pursuant to Sections 2.1 and 2.4
hereof.

                  (b) At the Closing or as soon as practicable thereafter, each
holder of record (other than Parent or Merger Sub or any other subsidiary of
Parent) of a certificate or certificates which immediately prior to the
Effective Time represented issued and outstanding Company Shares (individually a
"CERTIFICATE" and collectively the "CERTIFICATES") shall deliver to the Exchange
Agent (as defined below) such shareholder's Certificates. The holder of such
Certificate(s) shall be entitled to receive in exchange therefor a certificate
representing all of the shares of Parent Common Stock (excluding those shares
being placed in escrow as described below) and all the cash, if any, that such
holder is entitled to receive pursuant to Sections 2.1 and 2.4 hereof. State
Street Bank and Trust Company shall act as the agent for the Company
Shareholders for purposes of mailing and receiving transmittal letters and
distributing the Merger Consideration to the Company Shareholders (the "EXCHANGE
AGENT"). Of the shares otherwise issuable to the Company Shareholders, an
aggregate number of shares equal to 10% of the Parent Common Stock to be issued
in exchange for the acquisition of all Company Shares (the "INDEMNIFICATION
ESCROW SHARES") rounded up to the nearest whole share shall be deposited by the
Parent with the Indemnification Escrow Agent in accordance with the terms and
provisions of the Escrow Agreement to be executed as of the Closing between the
Parent, Merger Sub, the Company, the Indemnification Representatives and the
Indemnification Escrow Agent (the "ESCROW AGREEMENT"). The delivery of the
Indemnification Escrow Shares by Parent to the Indemnification Escrow Agent
shall be made on behalf of the Company Shareholders in accordance with the
provisions hereof, with the same force and effect as if such shares had been
delivered by Parent directly to such holders and subsequently delivered by such
holders to the Indemnification Escrow Agent. The shares so deposited shall be
evidenced by a separate certificate in the name of the Escrow Agent on behalf of
the Company Shareholders and shall be subject to the restrictions on transfer
and assignment provided in the Escrow Agreement.

         Mark B. Galvin has been selected as the initial representative of the
Company Shareholders (the "INDEMNIFICATION REPRESENTATIVE") and, in the event of
his inability or unwillingness prior to the execution of the Escrow Agreement to
act as Indemnification Representative, a substitute Indemnification
Representative will be selected by the holders of a majority of the Company
Shares. In the event of the inability or unwillingness of the then current
Indemnification Representative to act as Indemnification Representative after
the Closing, a substitute Indemnification Representative will be selected by the
holders of a majority of the shares of Parent Common Stock issued as Merger
Consideration. Such Indemnification Representative is authorized by this
Agreement, as a specific term of the Merger provided for herein, to act as
Indemnification Representative of the Company Shareholders in accordance with
the provisions hereof, with the powers and authority provided for in the Escrow
Agreement. The written consent to the Merger by a Company Shareholder and
adoption and approval of this Agreement and receipt of any Merger Consideration
by any Company Shareholder shall also constitute approval by such Company
Shareholder of the terms and provisions of the Escrow Agreement, including the
indemnification provided for therein, their confirmation of the appointment of
State Street Bank and Trust to act as Indemnification Escrow Agent, and their
approval of the terms and provisions therein relating to the Indemnification
Representative,

                                      -5-
<PAGE>

including the provisions relating to the appointment of replacements, and their
confirmation of the appointment of Mr. Galvin to act as the initial
Indemnification Representative.

                  (c) If any certificate for shares of Parent Common Stock is to
be issued in a name other than that in which the certificate surrendered in
exchange therefor is registered, it will be a condition of the issuance thereof
that such transfer be in compliance with any applicable state and federal
securities laws and that the certificate so surrendered will be properly
endorsed and otherwise in proper form for transfer and that the person
requesting such exchange will have paid to Parent or any agent designated by it
any transfer or other taxes required by reason of the issuance of a certificate
for shares of Parent Common Stock in any name other than that of the registered
holder of the certificate surrendered, or established to the satisfaction of
Parent or any agent designated by it that such tax has been paid or is not
payable.

                  (d) Until surrendered, each Certificate shall, after the
Effective Time, represent only the right to receive shares of Parent Common
Stock and the right to receive cash into which the Company Shares formerly
represented thereby shall have been converted pursuant to Section 2.1 hereof.
Any dividends or other distribution declared after the Effective Time with
respect to Parent Common Stock shall be paid to the holder of any Certificate
when the holder thereof surrenders such Certificate. At and after the Effective
Time, the holders of Certificates shall cease to have any rights as shareholders
of the Company, except for the right to surrender certificates pursuant to
Section 2.2(b). After the Closing there shall be no transfers on the stock
transfer books of the Company (the stock transfer books of which shall be
closed).

         SECTION 2.3 DISSENTING COMPANY SHARES. Company Shares for which the
Company's Shareholders' Consent has not been executed and delivered and with
respect to which a demand for payment and appraisal shall have been properly
made in accordance with the DCL ("DISSENTING COMPANY SHARES") shall not be
converted into the right to receive the Merger Consideration at or after the
Effective Time unless and until the holder of such Company Shares withdraws his
or her demand or becomes ineligible pursuant to the provisions of the DCL for
such payment and appraisal. If a holder of Dissenting Company Shares shall
withdraw his or her demand for such payment and appraisal or shall become
ineligible for such payment and appraisal, then, as of the Effective Time or the
occurrence of such event of withdrawal or ineligibility, whichever last occurs,
such holder's Dissenting Company Shares shall cease to be Dissenting Company
Shares and shall be converted into the right to receive, and shall be
exchangeable for, the Merger Consideration into which such Dissenting Company
Shares would have been converted pursuant to Section 2.1 hereof.

         SECTION 2.4 NO FRACTIONAL SHARES. No certificates or scrip for
fractional shares of Parent Common Stock will be issued, no Parent stock split
or dividend shall be paid in respect of any fractional share interest, and no
such fractional shares interest shall entitle the owner thereof to vote or to
any rights of or as a stockholder of Parent. In lieu of such fractional shares,
any holder of Company Shares who would otherwise be entitled to a fraction of a
share of Parent Common Stock at the Effective Time (after aggregating all
fractional shares of Parent Common Stock to be received by such holder) will be
paid the cash value of such fraction (rounded down to the nearest cent), which
shall be equal to the fraction multiplied by $25.64375, which

                                      -6-
<PAGE>

represents the ten (10) trading day average of the closing sale price per share
of the Parent Common Stock on the Nasdaq National Market from March 15, 1999
through March 26, 1999.

         SECTION 2.5 ADJUSTMENTS. If, between the date hereof and the Effective
Time, the outstanding shares of Parent Common Stock shall be changed into a
different number of shares or a different class by reason of any
reclassification, recapitalization, split-up, exchange of shares or
readjustment, or if a stock dividend thereon shall be declared with a record
date within such period, the number of shares of Parent Common Stock to be
issued and delivered in the Merger for each outstanding Company Share as
provided in this Agreement shall be correspondingly adjusted.

         SECTION 2.6 STOCK OPTIONS. At or prior to the Effective Time, Parent
and the Company shall take all action necessary to cause the assumption by
Parent as of the Effective Time of the options to purchase Common Stock of the
Company outstanding as of the Effective Time (the "OUTSTANDING OPTIONS"). Each
of the Outstanding Options shall be converted without any action on the part of
the holder thereof into an option to purchase shares of Parent Common Stock as
of the Effective Time. The number of shares of Parent Common Stock that the
holder of an assumed Outstanding Option shall be entitled to receive upon the
exercise of such option shall be a number of shares (rounded down to the nearest
whole number) determined by multiplying the number of shares of Common Stock of
the Company subject to such option, determined immediately before the Effective
Time, by the Conversion Ratio. The option price of each share of Parent Common
Stock subject to an assumed Outstanding Option shall be the amount (rounded up
to the nearest whole cent) obtained by dividing the exercise price per share of
Common Stock of the Company at which such option is exercisable immediately
before the Effective Time by the Conversion Ratio applicable to the Company
Shares. The assumption and substitution of Outstanding Options as provided
herein shall not give the holders of such options additional benefits which they
did not have immediately prior to the Effective Time or relieve the holders of
any obligations or restrictions applicable to their options or the shares
obtainable upon exercise of the options. Parent shall (i) reserve out of its
authorized but unissued shares of Common Stock sufficient shares to provide for
the exercise of the Outstanding Options and (ii) use all commercially reasonable
efforts to register under the Securities Act, as promptly as practicable after
the Effective Time and in no event later than ten (10) business days after the
Effective Time, those shares of Parent Common Stock to be issued upon the
exercise of the Outstanding Options for a period up to and ending on the first
date by which all Outstanding Options have been exercised, which registration
shall initially be effective under a registration statement on Form S-8 or such
other form as may be permitted under the Securities Act.


                                   ARTICLE III

             REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB

         Except as set forth in the disclosure schedule of Parent dated as of
the date hereof and delivered herewith to the Company (the "PARENT DISCLOSURE
SCHEDULE") (it being agreed that with respect to any matter that is clearly
disclosed in any Section of the Parent Disclosure Schedule in such a way as to
make its relevance to the information called for by another Section

                                      -7-
<PAGE>

readily apparent, such matter shall be deemed to have been included in the
Parent Disclosure Schedule in response to such other Section, notwithstanding
the omission of any appropriate cross-reference thereto) Parent and Merger Sub
represent and warrant to the Company and to each Company Shareholder as follows:

         SECTION 3.1 ORGANIZATION AND QUALIFICATION. Each of Parent and Merger
Sub is a corporation duly organized, validly existing and in good standing under
the laws of its jurisdiction of incorporation and has the requisite corporate
power to carry on its business as it is now being conducted. Parent is duly
qualified as a foreign corporation to do business, and is in good standing, in
each jurisdiction where the character of its properties owned or leased or the
nature of its activities makes such qualification necessary, except where the
failure to be so qualified would not have, individually or in the aggregate, a
material adverse effect on the business, assets, condition (financial or
otherwise) or result of operations of Parent and its subsidiaries taken as a
whole.

         SECTION 3.2 CAPITALIZATION. The authorized capital stock of Parent
consists of 10,000,000 shares of preferred stock, $.01 par value per share, of
which no shares are issued or outstanding or held in Parent's treasury, and
100,000,000 shares of Parent Common Stock, of which, as of March 22, 1999, (a)
34,465,955 shares were validly issued and outstanding, fully paid and
nonassessable and (b) 12,602,175 shares were reserved for issuance pursuant to
options granted under the Parent's stock option and stock purchase plans for its
employees, consultants and directors. Except as set forth above, there are no
options, warrants, conversion privileges or preemptive or other rights or
agreements outstanding to purchase or otherwise acquire any shares of Parent
Common Stock.

         SECTION 3.3 AUTHORITY RELATIVE TO THIS AGREEMENT. Each of Parent and
Merger Sub has the requisite corporate power and authority to enter into this
Agreement, the Escrow Agreement and the Registration Rights Agreement (as
defined in Section 6.2(d)) and to carry out its obligations hereunder. The
execution and delivery of this Agreement, the Escrow Agreement and the
Registration Rights Agreement and the consummation of the transactions
contemplated hereby and thereby have been duly authorized by the respective
Boards of Directors of Parent and Merger Sub and the sole shareholder of Merger
Sub and no other corporate proceedings on the part of Parent or Merger Sub are
necessary to authorize this Agreement, the Escrow Agreement and the Registration
Rights Agreement and the transactions contemplated hereby and thereby. This
Agreement, the Escrow Agreement and the Registration Rights Agreement have been
duly and validly executed and delivered by each of Parent and Merger Sub and,
assuming this Agreement, the Escrow Agreement and the Registration Rights
Agreement constitute valid and binding obligations of each Party hereto and
thereto other than Parent and Merger Sub, this Agreement, the Escrow Agreement
and the Registration Rights Agreement each constitutes a valid and binding
agreement of each of Parent and Merger Sub enforceable against each of Parent
and Merger Sub in accordance with their respective terms, except as the
enforceability hereof or thereof may be subject to or limited by bankruptcy,
insolvency, reorganization, arrangement or similar laws affecting the rights of
creditors generally, judicial limitations upon the specific performance of
certain types of obligations and public policy.

                                      -8-
<PAGE>

         SECTION 3.4 NON-CONTRAVENTION. Neither Parent nor Merger Sub is subject
to or obligated under any charter, by-law or contract provision or any license,
franchise or permit, or any order, writ, injunction, decree, statute, rule or
regulation which would be breached or violated or in respect of which a right of
acceleration would be created by its executing and carrying out this Agreement,
other than any such breach, violation or right which would not have,
individually or in the aggregate, a material adverse effect on the business,
assets, condition (financial or otherwise) or result of operations of Parent and
its subsidiaries taken as a whole, or the transactions contemplated by this
Agreement.

         SECTION 3.5 REPORTS AND FINANCIAL STATEMENTS. Parent has previously
furnished to the Company true and correct copies of its (i) Annual Report on
Form 10-K for the period ended December 31, 1998, as amended, (ii) its Quarterly
Reports on Form 10-Q for the periods ended March 28, 1998, June 27, 1998 and
September 26, 1998, (iii) its Current Report on Form 8-K filed as of December
14, 1998, (iv) its definitive Proxy Statement dated April 9, 1999, (v) its
Annual Report to Stockholders for the fiscal year ended December 31, 1998, (vi)
all other reports or registration statements filed by it with the Securities and
Exchange Commission (the "COMMISSION") under the Exchange Act since December 31,
1998 and (vi) Parent hereby agrees to furnish to the Company true and correct
copies of all reports or registration statements filed by it with the Commission
after the date hereof prior to the Closing all in the form so filed
(collectively, the "REPORTS"). As of their respective dates, the Reports
complied or will comply in all material respects with the then applicable
published rules and regulations of the Commission with respect thereto at the
date of their issuance and did not contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein, in light of the circumstances under which they
were made, not misleading. Each of the audited consolidated financial statements
and unaudited interim financial statements included in Parent's Reports has been
prepared in accordance with generally accepted accounting principles applied on
a consistent basis (except as may be indicated therein or in the notes thereto)
and fairly presents the financial position of the Parent as at its date, subject
to normal year-end adjustments and any other adjustments described therein,
which adjustments are not expected to be material in amount or effect.

         SECTION 3.6 VALIDITY OF PARENT COMMON STOCK. The shares of Parent
Common Stock to be issued in the Merger will, when issued, be duly authorized,
validly issued, fully paid and nonassessable.

         SECTION 3.7 CONSENTS AND APPROVALS OF GOVERNMENTAL AUTHORITIES. Except
for (a) the requirements of state securities (or "BLUE SKY") laws, (b) the
filing and recording of appropriate documents as provided by the laws of the
State of Delaware, (c) the filing of appropriate documents with the Nasdaq
National Market and (d) the filing of a Form D with the Commission, if
applicable, no consent, approval or authorization of, or declaration, filing or
registration with, any governmental or regulatory authority is required to be
made or obtained by Parent or Merger Sub in connection with the execution,
delivery and performance of this Agreement or the consummation of the
transactions contemplated hereby.

         SECTION 3.8 LITIGATION. Except as set forth on the Parent Disclosure
Schedule or in the Reports, there is no action, suit, claim, investigation or
proceeding pending against or threatened

                                      -9-
<PAGE>

against the Parent or Merger Sub or their properties and assets before any court
or arbitrator or any governmental body, agency, official or authority.

         SECTION 3.9 UNDISCLOSED LIABILITIES. Except as disclosed in the Reports
or in the Parent Disclosure Schedule, neither Parent nor any of its subsidiaries
has any liabilities or obligations of any nature (whether accrued, absolute,
contingent or otherwise) required by generally accepted accounting principles to
be recognized or disclosed on a consolidated balance sheet of Parent and its
subsidiaries or in the notes thereto, except (i) liabilities reflected in the
consolidated balance sheet of the Parent as of September 26, 1998 and (ii)
liabilities incurred since September 26, 1998, in the ordinary course of
business and consistent with past practice, none of which individually, or in
the aggregate has resulted in, is causing or will cause a material adverse
effect on the business, assets, condition (financial or otherwise) of Parent.

         SECTION 3.10 INTELLECTUAL PROPERTY. The "PARENT INTELLECTUAL PROPERTY"
consists of all material trade secrets, copyrights, patents, trademarks, service
marks, trade dress, all registrations and applications with respect thereto and
all material licenses or rights under the same, that are owned or used by
Parent. Except as set forth in the Parent Disclosure Schedule, (a) no claim has
been asserted or, to the knowledge of Parent, threatened by any person against
Parent with respect to the ownership or use of any Parent Intellectual Property
by Parent (including infringement claims) nor has Parent asserted any similar
claim against any person and, to the knowledge of Parent, there exists no set of
circumstances which would likely give rise to any such claim; and (b) Parent is
not in breach or violation of any agreement under which it holds or uses any
Parent Intellectual Property which breach or material violation would have a
material adverse effect on the business, prospects, results of operations or
financial condition of Parent and (c) Parent owns or has the right to use all
Parent Intellectual Property that is necessary for the conduct of Parent's
business as presently conducted.


                                   ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY


         Except as set forth in the disclosure schedule of the Company dated as
of the date hereof and delivered herewith to Parent (the "COMPANY DISCLOSURE
SCHEDULE") (it being agreed that with respect to any matter that is clearly
disclosed in any Section of the Company Disclosure Schedule in such a way as to
make its relevance to the information called for by another Section readily
apparent, such matter shall be deemed to have been included in the Company
Disclosure Schedule in response to such other Section, notwithstanding the
omission of any appropriate cross-reference thereto and that any reference to
the Company in this Article IV shall also include any and all subsidiaries), the
Company represent and warrant to Parent and Merger Sub as follows:

         SECTION 4.1 ORGANIZATION AND QUALIFICATION. The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the requisite corporate power and all material
governmental licenses, authorizations, consents

                                      -10-
<PAGE>

and approvals required for the ownership and operation of its properties and the
carrying on of its business as it is now being conducted and as it is now
proposed to be conducted through the Closing. The Company is duly qualified as a
foreign corporation to do business, and is in good standing, in the
jurisdictions identified in Section 4.1 of the Company Disclosure Schedule,
which are all the jurisdictions in which the character of its properties owned
or leased or the nature of its activities makes such qualification necessary,
except where the failure to be so qualified will not, individually or in the
aggregate, have a material adverse effect on the business, assets, condition
(financial or otherwise) or result of operations of the Company.

         SECTION 4.2  CAPITALIZATION.

                  (a) The authorized capital stock of the Company consists
20,000,000 shares of common stock of the Company and 10,696,402 shares of
preferred stock of the Company.

                  (b) The issued and outstanding capital stock of the Company,
which are and as of the Closing will be held of record and beneficially by the
shareholders of the Company, is as set forth on the Company Disclosure Schedule.
All of the issued and outstanding shares of capital stock of the Company have
been duly authorized and validly issued, are fully paid and nonassessable, are
not subject to any right of rescission and have been offered, issued, sold and
delivered by the Company in compliance with all registration or qualification
requirements (or applicable exemptions therefrom) of applicable federal and
state securities laws. Except as set forth on the Company Disclosure Schedule,
there are no options, warrants, conversion privileges or preemptive or other
rights or agreements outstanding to purchase or otherwise acquire any shares of
common stock of the Company. Except as set forth in the Company Disclosure
Schedule, there are, to the Company's knowledge, no options, warrants,
conversion privileges or preemptive or other rights or agreements as to which
the Company is not a party involving the purchase or other acquisition of any
capital stock in the Company, and there is no liability for dividends accrued
but unpaid. Except as set forth on the Company Disclosure Schedule, there are no
voting agreements, rights of first refusal or other restrictions (other than
normal restrictions on transfer under applicable federal and state securities
laws) applicable to any of the Company's capital stock. Each shareholder of the
Company holds of record and owns beneficially the number of shares of common
stock set forth opposite his, her or its name in the Company Disclosure
Schedule, free and clear of any restrictions on transfer, taxes, security
interests, options, warrants, purchase rights, contracts, commitments, equities,
claims, and demands, except for transfer restrictions arising under applicable
securities laws. No person other than the shareholders and holders of options to
purchase shares of the Company's capital stock listed in the Company Disclosure
Schedule holds any interest in any of the capital stock of the Company. True and
correct copies of the stock records of the Company, showing all issuances and
transfers of shares of capital stock of the Company since inception, have been
provided to Parent.

                  (c) Except as set forth in the Company Disclosure Schedule,
there are no outstanding rights of first refusal, preemptive rights, options,
warrants, conversion rights or other agreements, either directly or indirectly,
for the purchase or acquisition from the Company or any shareholder of the
Company of any shares of the Company's capital stock.

                                      -11-
<PAGE>

                  (d) Except as set forth on the Company Disclosure Schedule,
the Company is not a party or subject to any agreement or understanding, and
there is no agreement or understanding between any of the shareholders of the
Company that affects or relates to the voting or giving of written consents with
respect to any securities of the Company. Except as set forth on the Company
Disclosure Schedule, no shareholder of the Company or any affiliate thereof is
indebted to the Company, and the Company is not indebted to any shareholder of
the Company or any affiliate thereof. Except as set forth in the Company's
Disclosure Schedule, the Company is not under any contractual or other
obligation to register any of its presently outstanding securities or any of its
securities which may hereafter be issued.

         SECTION 4.3 SUBSIDIARIES. Except as disclosed in Section 4.3 of the
Company Disclosure Schedule, the Company has never owned, nor does it currently
own, directly or indirectly, any capital stock or other equity securities of any
corporation or have direct or indirect equity or ownership interest in any
association, partnership, joint venture or other entity other than RAScom
International, Inc., a Delaware corporation and wholly-owned subsidiary of the
Company and RAScom GmbH, a company organized under the laws of Germany and a
wholly-owned subsidiary of RAScom International Inc. (collectively, the
"SUBSIDIARIES"). Except for RAScom GmbH, no Subsidiary has conducted any
business operations or incurred any liability. All of the outstanding shares of
capital stock of each of the Subsidiaries are owned beneficially and of record
by the Company, one of the Subsidiaries, or any combination of the Company
and/or one or more of the Subsidiaries, in each case free and clear of any
liens, charges, restrictions, claims or encumbrances of any nature whatsoever;
and there are no outstanding subscriptions, warrants, options, convertible
securities, or other rights (contingent or other) pursuant to which any of the
Subsidiaries is or may become obligated to issue any shares of its capital stock
to any person other than the Company or one of the other Subsidiaries. Each
Subsidiary is duly organized, validly existing and in good standing in its
jurisdiction of organization and has the requisite corporate power and all
material governmental licenses, authorizations, consents and approvals required
for the ownership and operation of its properties and the carrying on of its
business as it is now being conducted and as it is now proposed to be conducted
through the Closing. Each Subsidiary is in good standing in each jurisdiction
where the character of its properties owned or leased or the nature of its
activities makes such qualification necessary, except where the failure to be so
qualified will not, individually or in the aggregate, have a material adverse
effect on the business, assets, condition (financial or otherwise) or result of
operations of the Company.

         SECTION 4.4 AUTHORITY RELATIVE TO THIS AGREEMENT. The Company has the
requisite corporate power and authority to enter into this Agreement and the
Escrow Agreement and to carry out its obligations hereunder and thereunder. The
execution and delivery of this Agreement and the Escrow Agreement and the
consummation of the transactions contemplated hereby and thereby have been duly
authorized by the Company's Board of Directors and, other than the adoption of
this Agreement by the Company Shareholders pursuant to the DCL, no other
corporate proceedings on the part of the Company are necessary to authorize this
Agreement and the Escrow Agreement and the transactions contemplated hereby and
thereby. This Agreement and the Escrow Agreement have been duly and validly
executed and delivered by the Company and, assuming this Agreement and the
Escrow Agreement constitute valid and binding obligations of each of Parent,
Merger Sub and each of the Company Shareholders that is a party

                                      -12-
<PAGE>

hereto and thereto, and assuming its adoption by the Company Shareholders, this
Agreement and the Escrow Agreement constitute valid and binding agreements of
the Company, enforceable against the Company in accordance with their terms,
except as the enforceability hereof may be subject to or limited by bankruptcy,
insolvency, reorganization, arrangement or similar laws affecting the rights of
creditors generally, judicial limitations upon the specific performance of
certain types of obligations and public policy.

         SECTION 4.5 NON-CONTRAVENTION. Assuming the receipt of all Required
Consents and Other Consents (each as defined in Section 4.6 below), neither the
execution, delivery or performance of this Agreement or the Escrow Agreement by
the Company, nor the consummation of the Merger or any other transaction
described herein, does or will, after the giving of notice, or the lapse of
time, or otherwise:

                  (a) conflict with, result in a breach of, or constitute a
default under, the Restated Certificate of Incorporation or the By-laws of the
Company or any federal, foreign, state or local court or administrative order or
process, or any contract, agreement or commitment to which the Company is a
party, or under which the Company is obligated, or by which the Company or any
of the rights, properties or assets of the Company are subject or bound;

                  (b) result in the creation of any mortgage, pledge, lien,
claim, charge, encumbrance or assessment upon, or otherwise adversely affect,
any of the rights, properties or assets of the Company;

                  (c) terminate, amend or modify, or give any party the right to
terminate, amend, modify, abandon or refuse to perform or comply with, any
contract, agreement or commitment to which the Company is a party, or under
which the Company is obligated, or by which the Company or any of the rights,
properties or assets of the Company are subject or bound; or

                  (d) accelerate, postpone or modify, or give any party the
right to accelerate, postpone or modify, the time within which, or the terms and
conditions under which, any liabilities, duties or obligations are to be
satisfied or performed, or any rights or benefits are to be received, under any
contract, agreement or commitment to which the Company is a party, or under
which the Company may be obligated, or by which the Company or any of the
rights, properties or assets of the Company are subject or bound.

                                      -13-
<PAGE>

         SECTION 4.6  REQUIRED AND OTHER CONSENTS.

                  (a) Section 4.6(a) of the Company Disclosure Schedule sets
forth each agreement, contract or other instrument binding upon the Company or
any Permit (as defined in Section 4.14 below) requiring a consent as a result of
the execution, delivery and performance of this Agreement and the Escrow
Agreement and the consummation of the transactions contemplated hereby and
thereby (each such consent, a "REQUIRED CONSENT"), except such consents as would
not, individually or in the aggregate, result in a material adverse change in
the business, assets, condition (financial or otherwise) or result of operations
of the Company, if not received by the Closing Date.

                  (b) Section 4.6(b) of the Company Disclosure Schedule sets
forth every other consent (each such consent, an "OTHER CONSENT") under such
agreements, contracts or other instruments or such Permits that are required
with respect to the execution, delivery and performance of this Agreement and
the Escrow Agreement and the consummation of the transactions contemplated
hereby and thereby.

         SECTION 4.7 FINANCIAL STATEMENTS AND REPORTS. The audited consolidated
balance sheets of the Company as of December 31, 1996 and December 31, 1997 and
the related consolidated audited statements of operations, stockholders' equity
and cash flows for each of the years ended December 31, 1996 and December 31,
1997 (the "COMPANY AUDITED FINANCIAL STATEMENTS"), delivered to Parent in
accordance with Section 6.3(i), in each case, present fairly, in all material
respects, the financial position of the Company and any subsidiaries as of the
dates thereof and their results of operations and changes in financial position
for the periods then ended in conformity with generally accepted accounting
principles applied on a consistent basis throughout the periods then ended. The
Company has also furnished Parent with a true and complete copy of the unaudited
consolidated statements of operations, stockholder's equity and cash flows of
the Company and any subsidiaries for the twelve months ended December 31, 1998
and the unaudited consolidated balance sheet of the Company and any subsidiaries
as of December 31, 1998 (the "BALANCE SHEET DATE") (collectively, the "COMPANY
UNAUDITED FINANCIAL STATEMENTS"). The consolidated balance sheets included in
the Company Unaudited Financial Statements fairly present the financial position
of the Company and any subsidiaries as of their dates and the other statements
included in the Company Unaudited Financial Statements fairly present the
results of operations, shareholders' equity and changes in financial position,
as the case may be, of the Company and any subsidiaries for the period therein
set forth, in each case in accordance with generally accepted accounting
principles consistently applied during the periods involved except as otherwise
stated therein and provided that the Company Unaudited Financial Statements lack
footnotes and other presentation items required by generally accepted accounting
principles and are subject to normal year-end adjustments which adjustments are
not expected to be material in amount.

         SECTION 4.8 TITLE TO PROPERTIES AND ASSETS. On December 31, 1998, the
Company had, and now has, good and valid title to all of the properties and
assets, tangible or intangible, owned by it, whether or not reflected in the
balance sheet dated December 31, 1998 or subsequently acquired by it, subject to
no mortgages, pledges, liens, encumbrances or other charges of any kind except
for those mortgages, pledges, liens, encumbrances or charges disclosed in

                                      -14-
<PAGE>

Section 4.8 of the Company Disclosure Schedule. Except as aforesaid, the assets
and properties owned by the Company at the Effective Time shall be free and
clear of mortgages, pledges, liens, encumbrances or charges of any kind. There
is no tangible asset used or required by the Company in the conduct of its
business as presently operated which is not either owned by it or licensed or
leased to it under a license or lease listed in Section 4.13 of the Company
Disclosure Schedule. All of the fixtures, machinery, equipment, tools and other
tangible personal property owned, leased or licensed by the Company are, and at
the Effective Time will be, sufficient to carry on the Company's business as
presently conducted.

         SECTION 4.9 ABSENCE OF CERTAIN CHANGES OR EVENTS. Since December 31,
1998, except as disclosed in Section 4.9 of the Company Disclosure Schedule or
reflected in the Company Unaudited Financial Statements, there has not been:

                  (a) any material adverse change in the business, assets,
condition (financial or otherwise) or result of operations of the Company, or
any fact, or anticipated event which, individually or in the aggregate, may
reasonably be expected to give rise to any material adverse change in the
business, assets, condition (financial or otherwise), results of operations or
prospects of the Company;

                  (b) any change in any method of accounting or accounting
practice of the Company;

                  (c) any declaration, setting aside or payment of any dividend
or other distribution with respect to any shares of capital stock of the
Company, or any repurchase, redemption, retirement or other acquisition by the
Company of any outstanding shares of capital stock or other securities of, or
other equity or ownership interests in, the Company;

                  (d) any change in the Restated Certificate of Incorporation or
By-laws of the Company or any amendment of any term of any outstanding security
of the Company;

                  (e) any incurrence, assumption or guarantee by the Company of
any indebtedness for borrowed money, other than in the ordinary course of
business and in an aggregate amount not exceeding $10,000;

                  (f) any creation or assumption by the Company of any lien on
any asset;

                  (g) any making of any loan, advance or capital contributions
to, or investment in, any person other than the Subsidiaries;

                  (h) any sale, lease, pledge, transfer or other disposition of
any capital asset;

                  (i) any transaction or commitment made, or any material
contract or agreement entered into, by the Company relating to its assets or
business (including the acquisition or disposition of any assets) other than in
the ordinary course of business and consistent with past practice or any
relinquishment by the Company of any contract or other right;

                                      -15-
<PAGE>

                  (j) any (A) grant of any severance or termination pay to any
director, officer or employee of the Company, (B) entering into of any
employment, severance, management, consulting, deferred compensation or other
similar agreement (or any amendment to any such existing agreement) with any
director, officer or employee of the Company, (C) change in benefits payable
under existing severance or termination pay policies or employment, severance,
management, consulting or other similar agreements, (D) change in compensation,
bonus or other benefits payable to directors or officers or, other than in the
ordinary course of business and consistent with past practice, to employees of
the Company or (E) change in the payment or accrual policy with respect to any
of the foregoing;

                  (k) any labor dispute or any activity or proceeding by a labor
union or representative thereof to organize any employees of the Company, or any
lockouts, strikes, slowdowns, work stoppages or threats thereof by or with
respect to any employees of the Company;

                  (l) any notes or accounts receivable or portions thereof
written off by the Company as uncollectible in an aggregate amount exceeding
$10,000;

                  (m) any issuance or sale of any stock, bonds or other
securities of which the Company is the issuer other than pursuant to the
exercise of employee stock options, or the grant, issuance or change of any
stock options, warrants, or other rights to purchase securities of the Company;

                  (n) any discharge or satisfaction of any lien or encumbrance
or payment or satisfaction of any obligation or liability (whether absolute,
accrued, contingent or otherwise and whether due or to become due) other than
current liabilities shown on the Balance Sheet and current liabilities incurred
since the Balance Sheet Date in the ordinary course of business and consistent
with past practice;

                  (o) any cancellation of any debts or claims or waiver of any
rights of substantial value in an aggregate amount exceeding $10,000;

                  (p) any sale, assignment or transfer of any Company
Intellectual Property (as defined in Section 4.15) or other similar assets,
including licenses therefore, other than in the ordinary course of business and
consistent with past practice;

                  (q) any capital expenditures, or commitment to make any
capital expenditures, for additions to property, plant or equipment in an
individual amount exceeding $5,000;

                  (r) payment of any amounts to, or liability incurred to or in
respect of, or sale of any properties or assets (real, personal or mixed,
tangible or intangible) to, or any transaction or any agreement or arrangement
with, any corporation or business in which the Company or any of its corporate
officers or directors, or any "affiliate" or "associate" (as such terms are
defined in the rules and regulations promulgated under the Securities Act of
1933, as amended (the "SECURITIES ACT") of any such person, has any direct or
indirect ownership interests; or

                                      -16-
<PAGE>

                  (s) any agreement undertaking or commitment to do any of the
foregoing.

         SECTION 4.10 DISCLOSURE OF LIABILITIES. On December 31, 1998, the
Company had no liability of any nature (whether accrued, absolute, contingent or
otherwise) required by generally accepted accounting principles to be reflected
on the balance sheet dated December 31, 1998 or otherwise disclosed that was not
fully disclosed, reflected or reserved against in the balance sheet dated
December 31, 1998. Except for the Secured Promissory Note dated October 26, 1998
payable to the Parent and the Security Agreement dated October 26, 1998 by and
between the Parent and the Company and liabilities which have been incurred
since December 31, 1998 in the ordinary and regular course of business, none of
which individually or in the aggregate has resulted in, is causing, or will
cause a material adverse effect on the business, assets, condition (financial or
otherwise) or result of operations of the Company, and except for liabilities
incurred by the Company in connection with the preparation and execution of this
Agreement and the consummation of the transactions contemplated herein since
December 31, 1998, the Company has not incurred any liability of any nature
(whether accrued, absolute, contingent or otherwise) which would be required by
generally accepted accounting principles to be reflected in a balance sheet
dated the date hereof.

         SECTION 4.11 ACCOUNTS, NOTES AND RECEIVABLES. All of the accounts,
notes and other receivables which are reflected in the balance sheet dated
December 31, 1998 were acquired in the ordinary and regular course of business;
and, except to the extent reserved against in the balance sheet dated December
31, 1998, all of the accounts, notes and other receivables which are reflected
therein have been collected in full, or are reasonably believed by the Company
to be good and collectible, in the ordinary and regular course of business; and
all of the accounts, notes and other receivables which have been acquired by the
Company since December 31, 1998 were acquired in the ordinary and regular course
of business and have been collected in full, or are reasonably believed by the
Company to be good and collectible, subject to an appropriate reserve determined
in a manner consistent with past practices of the Company, in the ordinary and
regular course of business. Except as set forth on the Company Disclosure
Schedule, no accounts, notes or other receivables are contingent upon the
performance by the Company after the date hereof of any material obligation or
contract. Except as disclosed in Section 4.11 of the Company Disclosure
Schedule, no person has any lien, charge, pledge, security interest or other
encumbrance on any of such receivables and no agreement for deduction or
discount has been made with respect thereto.

         SECTION 4.12 LITIGATION. Except as set forth in Section 4.12 of the
Company Disclosure Schedule, there is no action, suit, claim, investigation or
proceeding pending against or threatened against the Company or its properties
and assets before any court or arbitrator or any governmental body, agency,
official or authority.

                                      -17-
<PAGE>

         SECTION 4.13  AGREEMENTS.

                  (a) Section 4.13 of the Company Disclosure Schedule sets forth
a list of each agreement, contract or commitment of the following types under
which the Company is obligated:

                        (i) any agreements of guarantee or indemnification;

                        (ii) any contract for personal services or employment
which is not terminable at will by the Company without penalty or obligation to
make payments related to such termination;

                        (iii) any agreement or commitment containing a covenant
limiting or purporting to limit the freedom of the Company to compete with any
person in any geographic area or engage in any line of business;

                        (iv) any lease to which the Company is a party as lessor
or lessee;

                        (v) any joint venture contract or similar arrangement or
any other similar agreement which involves a sharing of profits or future
payments to other persons;

                        (vi) except for trade indebtedness incurred in the
ordinary course of business, any loan or credit agreements providing for the
extension of credit to the Company or any instrument evidencing or related in
any way to indebtedness incurred in the acquisition of companies or other
entities or indebtedness for borrowed money by way of direct loan, sale of debt
securities, purchase money obligation, conditional sale, guarantee, or other
debt obligation or instrument which individually is in the amount of $1,000 or
more;

                        (vii) any distributor, dealer, franchise, manufacturer's
representative, sales agency or other similar contract or commitment;

                        (viii) any license agreement, either as licensor or
licensee or any other similar contract or commitment;

                        (ix) any contract or agreement for the future sale,
license or sublicense by the Company of materials, products, services or
supplies;

                        (x) any contract, purchase order or agreement for the
future purchase by the Company of any materials, equipment, services or
supplies, which provides for payments which cannot be terminated by the Company
without penalty upon less than thirty (30) days' notice;

                        (xi) any contract or commitment for the sale by the
Company of any materials, products, services or supplies;

                                      -18-
<PAGE>

                        (xii) any agreement or arrangement for the assignment,
sale or other transfer by the Company of any contract or lease (or right to
payment thereunder);

                        (xiii) any contract or commitment for the acquisition,
construction or sale of fixed assets;

                        (xiv) any agreement pertaining to the Company's
maintenance or support of its products, services or supplies;

                        (xv) any agreement or arrangement for the sale of any of
the assets, properties or rights of the Company or for the grant of any
preferential rights to purchase any of its assets, properties or rights or which
requires the consent of any third party to the transfer and assignment of any of
its assets, properties or rights; or

                        (xvi) any contract or agreement, not elsewhere
specifically disclosed pursuant to this Agreement, involving the payment or
receipt by the Company of more than $10,000 in the aggregate.

                  (b) Since the Balance Sheet Date, the Company has not amended,
modified or terminated the terms of the contracts or agreements referred to in
Section 4.13(a) hereof unless such amendment, modification or termination was in
the ordinary course of business and the Company has provided Parent with written
notification of such.

         SECTION 4.14 LICENSES AND PERMITS. Section 4.14 of the Company
Disclosure Schedule correctly describes each material license, franchise, permit
or other similar governmental authorization affecting, or relating in any way
to, the business of the Company, together with the name of the government agency
or entity issuing such license or permit (the "PERMITS"). Such Permits are valid
and in full force and effect and, assuming the related Required Consents and
Other Consents have been obtained prior to the Closing Date, will not be
terminated or impaired or become terminable as a result of the transactions
contemplated hereby. Upon consummation of the transactions contemplated hereby,
the Surviving Corporation will, assuming the related Required Consents and Other
Consents have been obtained prior to the Closing Date, have all of the right,
title and interest in all the Permits.

         SECTION 4.15  INTELLECTUAL PROPERTY.

         (a) The "COMPANY INTELLECTUAL PROPERTY" consists of all material trade
secrets, copyrights, patents, trademarks, service marks, trade dress, all
registrations and applications with respect thereto and all licenses or rights
under the same, that are owned or used by the Company, including without
limitation, any of the foregoing embodied or contained in any of the following:
net lists; textual information contained in web sites; schematics; manufacturing
processes; customer lists and supplier lists; know-how and show-how; computer
software programs, source code and object code; complete system build software;
development and test tools, documentation, specifications, programmer and user
manuals used by the Company to install, operate, maintain, correct, test, repair
enhance, extend, modify, prepare derivative works based upon, design, develop,
reproduce and package software; all license and other rights in any third-

                                      -19-
<PAGE>

party product, intellectual property, proprietary or personal rights,
documentation, or tangible or intangible property; all documents, record and
electronic files relating to the design, end user documentation, manufacturing,
quality control, sales, marketing, or customer support; and all products of the
Company currently being licensed or sold or that are currently being developed,
including all hardware products and tools, software products and tools, and
services that are currently licensed, offered or under development by the
Company ("COMPANY PRODUCTS").

         As used in this Agreement "SOFTWARE" means any and all current and
prior and currently under development versions and releases, and predecessors of
the software and computer programs and applications of the Company to the extent
related to the business as currently being conducted or as currently required or
as reasonably can be anticipated to be conducted in the future, including all
such software and computer programs in machine readable source code forms and in
machine executable object code forms and all related specifications (including
all logic architectures, algorithms and logic flows and all physical,
functional, operating and design parameters), any data used by or related to
software, work in progress relating to corrections, modifications, revisions,
upgrades, translations or enhancements, all Company and third party development
and test tools used to develop or test the software, third party application
program interfaces to the software written by them and all methods of
implementation and packaging, together with all associated know-how and show-how
and all related Documentation. As used in this Agreement, "DOCUMENTATION" means
all documentation, specifications, manuals and other materials relating to the
software, including programmer and user manuals which are used by the Company to
install, operate, maintain, correct, test, repair, enhance, extend, modify,
prepare derivative works based upon, design, develop, reproduce and package such
software.

         (b) The Company Disclosure Schedule lists: (i) all patents, copyright
registrations, mask works, trademarks, service marks, trade dress, any renewal
rights for any of the foregoing, and any applications and registrations for any
of the foregoing, which are included in the Company Intellectual Property and
owned by or on behalf of the Company; (ii) all Company Products; and (iii) all
licenses, sublicenses and other agreements to which the Company is a party and
pursuant to which the Company or any other person is authorized to use the
Company Intellectual Property or exercise any other right with regard thereto
and (iv) any customer, supplier or other person expressly permitted by the
Company to purchase equipment directly from a third party manufacturer which
equipment would otherwise be supplied by the Company. The Company has delivered
to Parent true and complete copies of the agreements described in (iii) hereof.

         (c) The Company Intellectual Property consists solely of items and
rights which are either: (i) owned by the Company; (ii) in the public domain; or
(iii) rightfully used and authorized for use by the Company and its successors
pursuant to a valid license. All Company Intellectual Property which consists of
licenses or other rights to third party intellectual property is set forth in
the Company Disclosure Schedule. The Company has all rights in the Company
Intellectual Property necessary to commercially exploit the same in connection
with the Company's current, former, and planned or scheduled (whether for
release or development) activities in all geographic locations and fields of use
in which the Company currently operates or is scheduled to operate, and to
sublicense any or all such rights to third parties, including the right to grant
further sublicenses. All software created by the Company is as described in the

                                      -20-
<PAGE>

Documentation and performs in all material respects in accordance with the
specifications included in the Documentation.

         (d) The Company is not, nor as a result of the execution or delivery of
this Agreement and all other agreements contemplated hereby, or performance of
the Company's obligations hereunder, will the Company be, in violation of any
license, sublicense or other agreement to which the Company is a party. The
Company Disclosure Schedule lists all contracts or agreements under which the
Company is obligated to provide any consideration (whether financial or
otherwise) to any third party, or under which any third party otherwise would be
entitled to any consideration, with respect to any exercise of rights by the
Company or Buyer in the Company Intellectual Property.

         (e) The use, reproduction, modification, distribution, licensing,
sublicensing, sale or any other exercise of rights by the Company with respect
to any of the Company Products does not infringe any copyright, trade secret,
trademark, service mark, trade name, trade dress or mask work, or any patent,
moral right or other intellectual property right, right of privacy, or right in
personal data of any person. No claims (i) challenging the validity,
effectiveness or ownership by the Company of any of the Company Intellectual
Property, or (ii) to the effect that the use, reproduction, modification,
manufacturing, distribution, licensing, sublicensing, sale or any other exercise
of rights by the Company with respect to any of the Company Products infringes
or will infringe on any intellectual property or other proprietary or personal
right of any person, have been asserted to the Company or, to the knowledge of
the Company, are threatened by any person, nor to the knowledge of the Company
are there any valid grounds for any bona fide claim of any such kind. All
granted or issued patents and mask works and all registered trademarks listed on
the Company Disclosure Schedule and all registered copyrights held by the
Company are valid, enforceable and subsisting. To the knowledge of the Company,
there are no pending or unissued patent rights which infringe upon or impair the
Company Intellectual Property. To the knowledge of the Company, there is no
unauthorized use, infringement or misappropriation of any of the Company
Intellectual Property by any third party, employee or former employee.

         (f) No parties other than the Company possess any current or contingent
rights to any source code that is part of the Company Intellectual Property.
None of the Company Intellectual Property is subject to any source code, escrow
or similar agreement.

         (g) The Company Disclosure Schedule lists all parties who have created
any portion of, or otherwise have any rights in or to, the Company Intellectual
Property, other than employees of the Company who have no rights in or to any
Company Intellectual Property. The Company has secured from all parties who have
created any portion of, or otherwise have any rights in or to, the Company
Intellectual Property valid and enforceable written assignments of any such work
or other rights to Company and has provided true and complete copies of such
assignments to Parent.

         (h) "YEAR 2000 COMPLIANCE" refers to the ability of (i) the Company's
Products; (ii) the Company's internal computer system and (iii) the computer and
data processing systems of the Company's suppliers and other third parties on
whose products and services the Company relies to accurately recognize, process,
manage and manipulate date and time data from, into and



                                      -21-
<PAGE>

between the 20th and 21st centuries, including the years 1999, 2000 and leap
year calculations, such that neither performance nor functionality will be
affected by dates prior to, during or after the year 2000 and without causing a
disruption, failure of operation or substantial defect in such computer systems.
The Company has provided Parent with a memorandum (the "COMPANY YEAR 2000
MEMORANDUM") describing the Company's plan for achieving Year 2000 Compliance,
the current status of such effort, the costs expended by the Company in 1997 and
1998 towards year 2000 Compliance, and the anticipated future expenditures
related to Year 2000 Compliance. The Company has taken and is taking all
reasonably necessary and appropriate actions to achieve Years 2000 Compliance,
and the annual cost of such reasonably anticipated actions and expenditures to
achieve Year 2000 Compliance is not expected to be materially in excess of the
amounts set forth in the Company Year 2000 Memorandum. The costs of attaining
Year 2000 Compliance are not expected to have a material adverse effect on the
results or operations or liquidity of the Company.

         (i) The Company Disclosure Schedule includes a true and complete list
of support and maintenance agreements relating to Company Intellectual Property
including the identity of the parties entitled to receive such service or
maintenance, and the term of such agreements.

         (j) Company has obtained written agreements from all employees and
third parties with whom Company has shared confidential proprietary information
(i) of the Company, or (ii) received from others which the Company is obligated
to treat as confidential, which agreements require such employees and third
parties to keep such information confidential. The Company has delivered or
given access to all copies of such written agreements, as executed, to Parent.
None of the present or former employees, officers or directors of the Company
owns directly or indirectly, in whole or in part, any Company Intellectual
Property or application therefor.

         SECTION 4.16  EMPLOYEES.

                  (a) Section 4.16 of the Company Disclosure Schedule identifies
a list of (a) the names, titles, annual salaries and all other compensation of
all employees of the Company and (b) the wage rates for non-salaried employees
of the Company (by classification) delivered to Parent. Neither the Company nor
its officers or directors have any knowledge that any key employee of the
Company intends to resign or retire as a result of the transactions contemplated
by this Agreement or otherwise within 6 months after the Closing Date.

                  (b) Each current and former officer, employee and consultant
of the Company having access to confidential or proprietary information of the
Company has executed and delivered to the Company an agreement regarding the
protection of such confidential or proprietary information and the assignment of
inventions to the Company; copies of the currently used forms of all such
agreements have been delivered to Parent. The Company is not and never has been
engaged in any dispute or litigation with an employee or former employee
regarding matters pertaining to intellectual property or assignment of
inventions.

                  (c) The Company (i) has never been and is not now subject to a
union organizing effort, (ii) is not subject to any collective bargaining
agreement with respect to any of its employees, (iii) is not subject to any
other contract, written or oral, with any trade or labor



                                      -22-
<PAGE>

union, employees' association or similar organization, and (iv) has no material
current labor dispute. The Company has good labor relations, and has no
knowledge of any facts indicating that the consummation of the transactions
provided for herein will have a material adverse effect on its labor relations.

                  (d) Hours worked by and payments made to employees of the
Company have not been in violation of the Fair Labor Standards Act or any other
applicable federal, foreign, state or local laws dealing with such matters.

                  (e) All payments due from the Company on account of employee
health and welfare insurance in respect of years and periods (and portions
thereof) ended on or prior to the Closing Date were or will be paid prior to the
Closing Date or accrued as a liability on the Company's balance sheet dated
December 31, 1998 and previously disclosed to Parent.

                  (f) All severance and vacation payments which are or were due
under the terms of any agreement, oral or written, in respect of years and
periods (and portions thereof) ended on or prior to the Closing Date, were or
will be paid prior to the Closing Date or accrued as a liability on the
Company's balance sheet dated December 31, 1998 and previously disclosed to
Parent.

         SECTION 4.17  ENFORCEABILITY OF CONTRACTS, ETC.

                  (a) No person, firm, corporation or entity who is a party to
any contract, agreement, commitment or plan to which the Company is a party
(excluding warranty claims arising in the ordinary course of business and
consistent with past practice, which are not expected by the Company to be
material in the aggregate) involving potential liability or obligation in excess
of $10,000 has a valid defense, on account of non-performance or malfeasance by
the Company, which would make any such contracts, agreement, commitment or plan
not valid and binding upon or enforceable against such parties in accordance
with their terms, except to the extent such enforceability may be subject to or
limited by bankruptcy, insolvency, reorganization, arrangement or similar laws
affecting the rights of creditors generally and usual equity principles.

                  (b) Neither the Company, nor, to the knowledge of the Company,
any other person, firm, corporation or entity, is in breach or violation of, or
default under, any material contract, agreement, arrangement, commitment or plan
to which the Company is a party, and no event or action has occurred, is
pending, or, to the knowledge of the Company, is threatened, which, after the
giving of notice, or the lapse of time, or otherwise, would constitute a breach
or a default by the Company or, to the knowledge of the Company, any other
person, firm, corporation or entity, under any material contract, agreement,
arrangement, commitment or plan to which the Company is a party. The Company is
not in breach or violation of, or default under, its Restated Certificate of
Incorporation or By-laws, and no event or action has occurred, is pending, or is
threatened, which, after the giving of notice, or the lapse of time, or
otherwise, would constitute a breach or a default by the Company under its
Restated Certificate of Incorporation or By-laws.



                                      -23-
<PAGE>

         SECTION 4.18      TAXES.

                  (a) The term "TAXES" as used herein means all federal, state,
local, foreign net income, alternative or add-on minimum tax, estimated, gross
income, gross receipts, sales, use, ad valorem, value added, transfer,
franchise, capital profits, lease, service, license, withholding, payroll,
employment, excise, severance, stamp, occupation, premium, property,
environmental or windfall profit taxes, customs, duties and other taxes,
governmental fees and other like assessments and charges of any kind whatsoever,
together with all interest, penalties, additions to tax and additional amounts
with respect thereto, and the term "TAX" means any one of the foregoing Taxes.
The term "TAX RETURNS" as used herein means all returns, declarations, reports,
claims for refund, information statements and other documents relating to Taxes,
including all schedules and attachments thereto, and including all amendments
thereof, and the term "TAX RETURN" means any one of the foregoing Tax Returns.
"TAX AUTHORITY" means any governmental authority responsible for the imposition
of any Tax. "CODE" as used herein means the Internal Revenue Code of 1986, as
amended. For purposes of this Section 4.18, "Company" shall include the Company
and its subsidiaries.

                  (b) The Company has timely filed all Tax Returns required to
be filed and has paid all Taxes owed (whether or not shown as due on such
returns), including, without limitation, all Taxes which the Company is
obligated to withhold for amounts paid or owing to employees, creditors and
third parties. All Tax Returns filed by the Company were complete and correct in
all material respects, and such Tax Returns correctly reflected the material
facts regarding the income, business, assets, operations, activities, status and
other matters of the Company and any other information required to be shown
thereon. Except as set forth on Section 4.18 of the Company Disclosure Schedule,
none of the Tax Returns filed by the Company or Taxes payable by the Company
have been the subject of an audit, action, suit, proceeding, claim, examination,
deficiency or assessment by any governmental authority, and no such audit,
action, suit, proceeding, claim, examination, deficiency or assessment is
currently pending or, to the knowledge of the Company, threatened. Except as set
forth on the Company Disclosure Schedule, the Company is not currently the
beneficiary of any extension of time within which to file any Tax Return, and
the Company has not waived any statute of limitation with respect to any Tax or
agreed to any extension of time with respect to a Tax assessment or deficiency.
All material elections with respect to Taxes affecting the Company, as of the
date hereof, are set forth in the Company Audited Financial Statements or in the
Company Disclosure Schedule. None of the Tax Returns filed by the Company
contain a disclosure statement under former Section 6661 of the Code or Section
6662 of the Code (or any similar provision of state, local or foreign Tax law).

                  (c) The Company is not a party to any agreement, contract,
arrangement or plan that has resulted or would result, separately or in the
aggregate, in the payment of (i) any "excess parachute payments" within the
meaning of Section 280G of the Code (without regard to the exceptions set forth
in Sections 280G(b)(4) and 280G(b)(5) of the Code) or (ii) any amount for which
a deduction would be disallowed or deferred under Section 162 or Section 404 of
the Code. The Company has not agreed to make any adjustment under Section 481(a)
of the Code (or any corresponding provision of state, local or foreign Tax law)
by reason of a change in accounting method or otherwise, and will not be
required to make such an adjustment as a result



                                      -24-
<PAGE>

of the transactions contemplated by this Agreement. The Company is not, and has
not been, a U.S. real property holding company (as defined in Section 897(c)(2)
of the Code) during the applicable period specified in Section 897(c)(1)(A)(ii)
of the Code. No claim has ever been made by a Tax Authority in a jurisdiction
where the Company does not file Tax Returns that it is or may be subject to Tax
in that jurisdiction. The Company has not participated in an international
boycott as defined in Section 999 of the Code. No portion of the Merger
Consideration is subject to the Tax withholding provisions of Section 3406 of
the Code, or of Subchapter A of Chapter 3 of the Code or of any other provision
of law. The Company is not a party to any joint venture, partnership, or other
arrangement or contract which could be treated as a partnership for federal
income tax purposes. The Company does not have, and has not had, a permanent
establishment in any foreign country, as defined in any applicable Tax treaty or
convention between the United States and such foreign country. None of the
shares of outstanding capital stock of the Company are subject to a "substantial
risk of forfeiture" within the meaning of Section 83 of the Code. The Company
has never filed a consent pursuant to Section 341(f) of the Code, relating to
collapsible corporations.

                  (d) The Company is not a party to any Tax sharing agreement or
similar arrangement. The Company has never been a member of a group filing a
consolidated federal income Tax Return (other than a group the common parent of
which was the Company), and the Company does not have any liability for the
Taxes of any Person (other than the Company) under Treasury Regulation Section
1.1502-6 (or any corresponding provision of state, local or foreign Tax law), as
a transferee or successor, by contract, or otherwise. The Company has no net
operating losses or other tax attributes presently subject to limitation under
Sections 382, 383 or 384 of the Code, or the federal consolidated return
regulations (other than limitations imposed as a result of the transactions
contemplated pursuant to this Agreement).

                  (e) There are no liens for Taxes upon any of the assets, other
than for Taxes not yet due and payable. The unpaid Taxes of the Company did not,
as of December 31, 1998, exceed the reserve for actual Taxes (as opposed to any
reserve for deferred Taxes established to reflect timing differences between
book and Tax income) as shown on the Company Unaudited Balance Sheet dated
December 31, 1998, and will not exceed such reserve as adjusted for the passage
of time through the Closing Date in accordance with the past custom and practice
of the Company in filing their Tax Returns. Schedule 4.18 hereto contains a list
of all jurisdictions (whether foreign or domestic) to which the Company, to the
best of its knowledge, has been or will be liable for any Tax for any taxable
period after December 31, 1995 and ending on or before December 31, 1998.

         SECTION 4.19 INSURANCE. Section 4.19 of the Company Disclosure Schedule
sets forth a list of, and true and complete copies have previously been made
available to Parent and Merger Sub of, all insurance policies and fidelity bonds
covering the assets, business, operations and employees of the Company. There is
no claim by the Company pending under any of such policies or bonds as to which
coverage has been questioned, denied or disputed by the underwriters of such
policies or bonds. All premiums payable under all such policies and bonds have
been paid and the Company is otherwise in full compliance with the material
terms and conditions of all such policies and bonds. Such policies of insurance
and bonds (or other policies



                                      -25-
<PAGE>

and bonds providing substantially similar insurance coverage) have been in
effect since January 1, 1996 and remain in full force and effect.

         SECTION 4.20  BOOKS AND RECORDS.

                  (a) The books, records and accounts of the Company (i) are
accurate and complete in all material respects and have been maintained in
accordance with good business practices on a basis consistent with prior years,
(ii) are stated in reasonable detail and accurately and fairly reflect the
transactions and dispositions of the assets of the Company and (iii) accurately
and fairly reflect the basis for the Company Unaudited Financial Statements.

                  (b) The Company has implemented and maintained a system of
internal accounting controls sufficient to provide reasonable assurances that
(i) transactions are executed in accordance with management's general or
specific authorization; (ii) transactions are recorded as necessary (A) to
permit preparation of financial statements in conformity with generally accepted
accounting principles consistently applied and (B) to maintain accountability
for assets; and (iii) the amount recorded for assets on the books and records of
the Company is compared with the existing assets at reasonable intervals in
connection with the preparation of annual audits of the Company's financial
statements and appropriate action is taken with respect to any differences.

         SECTION 4.21 COMPLIANCE WITH GOVERNMENTAL REGULATIONS. The Company is
not in violation of any federal, foreign, state or local law, statute,
ordinance, rule, regulation or court or administrative order or process relating
to the operation, conduct or ownership of the property, business or affairs of
the Company except for violations that, individually or in the aggregate would
not have a material adverse effect on the Company.

         SECTION 4.22 ENVIRONMENTAL COMPLIANCE. (a) the Company has materially
complied with all applicable international, federal, state and/or local laws
(including without limitation case law, rules, regulations, orders, judgments,
decrees, permits, licenses and governmental approvals) that are intended to
protect the environment and/or human health or safety (collectively,
"ENVIRONMENTAL LAWS"); (b) the Company has not handled, generated, used, stored,
transported or disposed of any substance or waste which is regulated by
Environmental Laws, except for those reasonably incidental to its business which
have been handled in compliance with Environmental Laws; and (c) there are no
"Environmental Liabilities." For purposes of this Agreement "ENVIRONMENTAL
LIABILITIES" are any liabilities which (i) arise out of or in any way relate to
the Company or any real estate at any time owned, used or leased by the Company,
or the Company's use or ownership thereof, whether vested or unvested,
contingent or fixed, actual or potential, and (ii) arise from or relate to
actions (including any failure to act) occurring or conditions existing on or
before the Closing Date.

         SECTION 4.23 FIRE, FLOOD, ACCIDENT, ETC. Since the Balance Sheet Date,
the Company has not sustained any loss on account of fire, flood, accident or
other calamity of such character as to interfere with the continued operation of
its business, regardless of whether or not such loss shall have been insured
against.



                                      -26-
<PAGE>

         SECTION 4.24  REAL ESTATE.

                  (a) Section 4.24 of the Company Disclosure Schedule contains a
schedule setting forth and describing all real estate which is owned or leased
by the Company, or in which the Company has any other right, title or interest.
True and complete copies of each lease have been provided or made available to
Parent and such leases constitute the entire understanding relating to the
Company's use and occupancy of the leased premises. The leases are presently in
full force and effect without further amendment or modification. The Company is
not in default in any material respect in the performance of obligations under
any lease, and the Company does not know of any state of facts which with the
giving of notice or the passage of time, or both, would constitute a default by
the Company or any other party thereunder.

                  (b) To the knowledge of the Company, the improvements located
on the real estate described in Section 4.24 of the Company Disclosure Schedule
are not the subject of any official complaint or notice of violation of any
applicable zoning ordinance or building code and there is no use or occupancy
restriction or condemnation proceeding pending, or threatened against the
Company.

         SECTION 4.25 BANK ACCOUNTS. Section 4.25 of the Company Disclosure
Schedule contains a schedule setting forth and describing (i) all bank accounts
owned or maintained by the Company and all authorized signatories with respect
thereto; and (ii) safety deposit boxes maintained by the Company and all persons
having access with respect thereto.

         SECTION 4.26 EMPLOYEE BENEFIT PLANS. Except as disclosed on Schedule
4.26, neither the Company nor any person that together with the Company would be
treated as a single employer (an "ERISA AFFILIATE") under Section 414 of the
Internal Revenue Code of 1986, as amended (the "CODE") has established or
maintains or is obligated to contribute to (a) any bonus, severance, stock
option, or other type of incentive compensation plan, program, agreement,
policy, commitment, contract or arrangement (written or oral), (b) any pension,
profit-sharing, retirement or other plan, program or arrangement, or (c) any
other employee benefit plan, fund or program, including, but not limited to,
those described in Section 3(3) of the Employee Retirement Income Security Act
of 1974, as amended ("ERISA"). All such plans (individually, a "PLAN" and
collectively, the "PLANS") have been operated and administered in all material
respects in accordance with their terms, as applicable, with the requirements
prescribed by any and all statutes, orders, rules and regulations, including but
not limited to ERISA and the Code. Each Plan which is intended to be qualified
under Section 401(a) of the Code is so qualified and has been so qualified
during the period from its adoption to date. No act or failure to act by the
Company has resulted in, nor does the Company have knowledge of a non-exempt
"PROHIBITED TRANSACTION" (as defined in ERISA) with respect to the Plans.
Neither the Company nor any ERISA Affiliate maintains or has ever maintained or
contributed to any Plan subject to Title IV of ERISA. Except as disclosed on
Schedule 4.26, none of the Plans covers any non-United States employee or former
employee of the Company or any subsidiary. With respect to the employees and
former employees of the Company, there are no employee post-retirement medical
or health plans in effect, except as required by Section 4980B of the Code.



                                      -27-
<PAGE>

         SECTION 4.27 CONSENTS AND APPROVALS OF GOVERNMENTAL AUTHORITIES. Except
for (a) the requirements of state securities laws and (b) the filing and
recording of appropriate documents as provided by the laws of the State of
Delaware, no consent, approval or authorization of, or declaration, filing or
registration with, any governmental or regulatory authority is required to be
made or obtained by the Company in connection with the execution, delivery and
performance of this Agreement or the consummation of the transactions
contemplated hereby.

         SECTION 4.28 CONFLICTS OF INTEREST. To the knowledge of the Company and
the Company Shareholders, none of the directors, officers, employees or
shareholders of the Company (a) has any material direct or indirect interest in
any entity which does business with the Company; (b) has any direct or indirect
interest in any property, asset or right which is used by the Company in the
conduct of its business; or (c) has any contractual relationship with the
Company other than such relationships which occur from being an officer,
employee, director or security holder of the Company.

         SECTION 4.29 ACCURACY OF REPRESENTATIONS. The representations made by
the Company herein, subject to and supplemented by the Company Disclosure
Schedule, are true and correct, and, when taken as a whole, do not contain any
untrue statement of a material fact or knowingly omit to state any material fact
necessary in order to make the statements included herein or therein, in light
of the circumstances under which they were made, not misleading.

      SECTION 4.30 INFORMATION STATEMENT. The information regarding the Company
and its officers, directors and shareholders included in the information to be
sent to the Company Shareholders in connection with the consideration and
approval of the Merger, this Agreement and the other transactions contemplated
in the Company's Shareholders' Consent (such information statement as amended or
supplemented is referred to herein as the "INFORMATION STATEMENT") shall not, on
the date the Information Statement (or any amendment thereof or supplement
thereto) is first mailed to the Company's Shareholders, at the time of the
execution and delivery of the Company's Shareholders' Consent and at the
Effective Time, contain any statement which, at such time and in light of the
circumstances under which it shall be made, is false or misleading with respect
to any material fact, or shall omit to state any material fact necessary in
order to make the statements made therein not false or misleading; or omit to
state any material fact necessary to correct any statement in any earlier
communication with respect to the solicitation of signatures to the Company
Shareholders' Consent which has become false or misleading. If at any time prior
to the Effective Time any event relating to the Company or any of its
affiliates, officers or directors should be discovered by the Company which
should be set forth in an amendment or a supplement to the Information
statement, the Company shall promptly inform Parent and Merger Sub.
Notwithstanding the foregoing, the Company makes no representation or warranty
with respect to any information regarding Parent or Merger Sub which is
contained in any of the foregoing documents.




                                      -28-
<PAGE>

                                  ARTICLE IV-A

                         REPRESENTATIONS AND WARRANTIES
                           OF THE COMPANY SHAREHOLDERS

         Each Company Shareholder executing and delivering this Agreement
severally represents and warrants to Parent and Merger Sub, as to itself,
himself or herself only, as follows:

                  (a) Subject to applicable community property laws, such
Company Shareholder is the lawful owner of the Company Shares to be exchanged
for shares of Parent Common Stock pursuant to this Agreement and has, and on the
Closing Date will have, good and clear title to such Company Shares, free of all
restrictions on transfer, liens, encumbrances, security interests and claims
whatsoever, other than as set forth in the Amended and Restated Stockholders
Agreement dated as of August 22, 1997 among the Company, such Company
Shareholder and certain other shareholders of the Company.

                  (b) Such Company Shareholder has, and on the Closing Date will
have, full legal right, power and authority to enter into this Agreement and to
sell and deliver the Company Shares in the manner provided herein, and this
Agreement, the Escrow Agreement and the Registration Rights Agreement have been
duly authorized, executed and delivered by such Company Shareholder and this
Agreement, the Escrow Agreement and the Registration Rights Agreement are valid
and binding agreements of such Company Shareholder enforceable in accordance
with their respective terms, except as may be limited by bankruptcy, insolvency,
reorganization, arrangement or similar laws affecting the rights of creditors
generally, judicial limitations upon equitable remedies including the specific
performance of certain types of obligations and public policy.

                  (c) The execution, delivery and performance of this Agreement,
the Registration Rights Agreement and the Escrow Agreement by such Company
Shareholder, compliance by such Company Shareholder with all the provisions
hereof and thereof and the consummation of the transactions contemplated hereby
or thereby will not require any consent, approval, authorization or other order
of any court, regulatory body, administrative agency or other governmental body,
or any agreement, indenture or other instrument to which such Company
Shareholder is a party or by which such Company Shareholder or property of such
Company Shareholder is bound, or violate or conflict with any laws,
administrative regulation or ruling or court decree applicable to such Company
Shareholder or property of such Company Shareholder.




                                      -29-
<PAGE>

                                    ARTICLE V

                                    COVENANTS

         The following covenants shall apply to the period of time from the date
hereof until the Effective Time unless otherwise specifically provided. All
references to the Company in Article V shall refer to the Company and any and
all subsidiaries.

         SECTION 5.1 CONDUCT OF BUSINESS BY THE COMPANY PENDING THE MERGER.
Except as contemplated by this Agreement, during the period from the date of
this Agreement to the Effective Time, the Company will conduct its operations
only in the ordinary and usual course of business and consistent with past
practice and will use its best efforts to preserve intact its present business
organization, keep available the services of its present officers and key
employees and preserve its relationships with customers, suppliers and others
having business dealings with it to the end that its goodwill and on-going
business shall not be impaired at the Effective Time. During such period the
Company shall promptly report to Parent any occurrence or omission which shall
have caused any representation or warranty of the Company hereunder to become
untrue as of the time of such occurrence or omission, and shall confer on a
regular and frequent basis with representatives of Parent to report operational
matters of a material nature and to report the general status of the ongoing
operations of the business of the Company. Without limiting the generality of
the foregoing, and except as contemplated by this Agreement and the Company
Disclosure Schedule, the Company will not, prior to the Effective Time, without
the prior written consent of Parent in each instance:

                  (a) issue, sell or pledge, or authorize or propose the
issuance, sale or pledge of (i) any shares of capital stock of any class of the
Company (including Company Shares), or securities convertible into any such
shares, or any rights, warrants or options to acquire any such shares or
convertible securities, or (ii) any other securities in respect of, in lieu of
or in substitution for Outstanding Company Shares;

                  (b) purchase or redeem or otherwise acquire, or propose to
purchase or redeem or otherwise acquire, any outstanding shares of capital stock
of any class (including Company Shares), or securities convertible into any such
shares, or any rights, warrants or options to acquire any such shares or
convertible securities;

                  (c) declare or pay any dividend or distribution on any shares
of its capital stock other than as approved in writing by Parent;

                  (d) authorize, recommend, propose or announce an intention to
authorize, recommend or propose, or enter into a letter of intent (whether or
not binding), an agreement in principle or an agreement with respect to any
merger, consolidation or business combination (other than the Merger), any
acquisition of assets or securities, any disposition of assets or securities, or
any change in the Company's capitalization, or an entry into a material contract
other than in the ordinary course of business or any amendment or modification
of any material contract rights;



                                      -30-
<PAGE>

                  (e) except as may be contemplated herein, take any action
which would make any representation or warranty in this Agreement (other than
any representation or warranty that speaks as of a particular date) untrue or
incorrect, as if made as of such time;

                  (f) enter into any agreement, contract or commitment (other
than in the ordinary course of business and other than agreements, contracts or
commitments which were under negotiation on the date hereof and which are
disclosed on the Company Disclosure Schedule) which, if entered into prior to
the date hereof, would be required to be listed in Section 4.13 of the Company
Disclosure Schedule and which involves a payment, obligation or commitment in
excess of $10,000;

                  (g) enter into any contract, agreement, license or commitment
which would be breached or violated or in respect of which a right of
acceleration would be created by the Company's execution, delivery and
performance of this Agreement and the transactions contemplated hereby;

                  (h) (i) increase or agree to increase the compensation payable
or to become payable to its officers or employees, (ii) grant any severance or
termination pay to, or enter into any employment or severance agreement, with
any employee, (iii) enter into any collective bargaining agreement, (iv)
establish, adopt, enter into or amend in any material respect any bonus, profit
sharing, thrift, compensation, stock option, restricted stock, pension,
retirement, deferred compensation, employment, termination, severance or other
plan, trust, fund, policy or arrangement for the benefit of any directors,
officers or employees; or

                  (i) agree in writing or otherwise to take any of the foregoing
actions.

         SECTION 5.2  ACCESS AND INFORMATION; CONFIDENTIALITY.

                  (a) The Company shall afford to Parent and to Parent's
accountants, counsel and other representatives access throughout the period
prior to the Effective Time to its senior management, properties, books,
contracts, commitments and records (including but not limited to tax returns)
and all other information concerning its business, properties and personnel as
Parent may reasonably request.

                  (b) Parent shall afford to the Company and to its counsel and
to the Company Shareholders access throughout the period prior to the Effective
Time to its senior management, and all other information concerning Parent as
the Company or a Company Shareholder may reasonably request. The Company
Shareholders shall also be afforded the opportunity to ask questions and to
receive accurate and complete answers from Parent concerning the terms and
conditions of the Merger and the issuance of shares of Parent Common Stock
pursuant thereto.

                  (c) The Company and its affiliates will hold, and will use
their best efforts to cause their respective officers, directors, employees,
accountants, counsel, consultants, advisors and agents to hold, in confidence,
unless compelled to disclose by judicial or administrative process or by other
requirements of law, (i) all confidential documents and information concerning
Parent and its affiliates furnished to the Company or its affiliates or
representatives in



                                      -31-
<PAGE>

connection with the transactions contemplated by this Agreement, and (ii) (after
the Closing Date) all confidential documents and information concerning the
Company, except to the extent that such information can be shown to have been
(A) previously known on a nonconfidential basis by the Company, (B) in the
public domain through no fault of the Company or (C) later lawfully acquired by
the Company from sources other than the Company (with respect to information
described in clause (ii) above) or Parent; provided that the Company may
disclose such information to its affiliates, stockholders, officers, directors,
employees, accountants, counsel, consultants, advisors and agents in connection
with the transactions contemplated by this Agreement so long as such persons are
informed by the Company of the confidential nature of such information and are
directed by the Company to treat such information confidentially. The obligation
of the Company to hold any such information in confidence shall be satisfied if
it exercises the same care with respect to such information as it would take to
preserve the confidentiality of its own similar information.

                  (d) Prior to the Closing Date and after any termination of
this Agreement, Parent and its affiliates will hold, and will use their best
efforts to cause their respective officers, directors, employees, accountants,
counsel, consultants, advisors and agents to hold, in confidence, unless
compelled to disclose by judicial or administrative process or by other
requirements of law, all confidential documents and information concerning the
Company furnished to Parent or its affiliates in connection with the
transactions contemplated by this Agreement, except to the extent that such
information can be shown to have been (i) previously known on a nonconfidential
basis by Parent, (ii) in the public domain through no fault of Parent or (iii)
later lawfully acquired by Parent from sources other than the Company; provided
that Parent may disclose such information to its officers, directors, employees,
accountants, counsel, consultants, advisors and agents in connection with the
transactions contemplated by this Agreement so long as such persons are informed
by Parent of the confidential nature of such information and are directed by
Parent to treat such information confidentially. The obligation of Parent to
hold any such information in confidence shall be satisfied if it exercises the
same care with respect to such information as they would take to preserve the
confidentiality of its own similar information.

                  (e) If this Agreement is terminated in accordance with Section
8.1 hereof, Parent shall, and shall cause its accountants, counsel and other
representatives to immediately destroy or deliver to the Company all documents
and other material, and all copies thereof, obtained by Parent or on its behalf
from the Company in connection with this Agreement, whether so obtained before
or after the execution hereof, and will not disclose any such information or
documents to any third parties or make any use of such. If this Agreement is
terminated in accordance with Section 8.1 hereof, the Company shall, and shall
cause its accountants, counsel and other representatives to, immediately destroy
or deliver to Parent all documents and other material, and all copies thereof,
obtained by the Company or on its behalf from Parent in connection with this
Agreement, whether so obtained before or after the execution hereof, and will
not disclose any such information or documents to any third parties or make any
use of such.

         SECTION 5.3 REASONABLE EFFORTS. Subject to the terms and conditions
herein provided, each of the parties hereto agrees to use all reasonable efforts
to take, or cause to be taken, all



                                      -32-
<PAGE>

action and to do, or cause to be done, all things necessary, proper or advisable
under applicable laws and regulations expeditiously and practicably to
consummate and make effective the transactions contemplated by this Agreement,
including using its reasonable efforts to obtain all necessary actions or
non-actions, waivers, consents and approvals from governmental or regulatory
bodies and to effect all necessary registrations and filings.

         SECTION 5.4 NO SOLICITATION. Unless and until this Agreement shall have
been terminated pursuant to Section 8.1 hereof, the Company agrees that it will
not directly or indirectly (or authorize its subsidiaries, agents, investment
bankers, officers, directors, employees, affiliates or representatives or any of
their respective family members to) solicit, entertain, negotiate or discuss
with any person or entity (other than Parent) the sale or licensing of the
Company's products (other than transactions consistent with the Company's
ordinary course of business) or the sale or transfer of the Company or the
Company's business, whether by asset sale, stock sale, merger or any other form
of business combination, joint venture or strategic alliance or enter into any
agreement or understanding with respect thereto. If the Company (or any of its
subsidiaries, agents, investment bankers, officers, directors, employees,
affiliates or representatives or any of their respective family members) shall
receive any bona fide offer or proposal concerning the above, such offer or
proposal shall be promptly delivered to Parent.

         SECTION 5.5 PUBLIC ANNOUNCEMENTS. Parent and the Company will consult
with each other before issuing any press release or otherwise making any public
statements with respect to the transactions contemplated hereby and shall not
issue any such press release or make any such public statement prior to such
consultation, except as may be required by law.

         SECTION 5.6 INSURANCE. The Company will use its best efforts to
maintain in force at the Effective Time policies of insurance of the same
character and coverage as those described in Section 4.19 of the Company
Disclosure Schedule and the Company will promptly notify Parent in writing of
any changes in such insurance coverage occurring prior to the Effective Time.

         SECTION 5.7 POOLING. Parent, the Merger Sub, the Company and each of
the Company Shareholders shall use all reasonable efforts, shall cooperate fully
and shall take all actions as are reasonably necessary to allow the Merger and
other transactions contemplated by this Agreement to be accounted for as a
"pooling of interests" in accordance with United States generally accepted
accounting principles.

         SECTION 5.8 SHAREHOLDER APPROVAL. The Company shall use its best
efforts to obtain the approval of the Merger, this Agreement and the
transactions contemplated herein by the Company Shareholders by means of a
shareholder solicitation in compliance with the terms and conditions of
Regulation D under the Securities Act.

         SECTION 5.9 RESALE REGISTRATION STATEMENTS. Within sixty (60) days
after the Effective Time, Parent shall file a registration statement (the
"RESALE REGISTRATION STATEMENT") on Form S-3 registering fifty percent (50%) of
the shares of Parent Common Stock issued to each of the Company Shareholders
upon consummation of the Merger under the Securities Act and shall use all
commercially reasonable efforts to cause the Resale Registration Statement to be
declared effective by the Commission on, or as expeditiously as possible after,
the publication by Parent



                                      -33-
<PAGE>

of financial results including at least thirty (30) days' post-Closing combined
results of operations of Parent and the Company and to cause such Resale
Registration Statement to remain effective until the first anniversary of the
Effective Time, all as more fully described in the Registration Rights
Agreement. Parent agrees to cause a registration statement under the Securities
Act on Form S-3 relating to the remaining fifty percent (50%) of the shares of
Parent Common Stock issued to each Company Shareholder pursuant to the Merger
Agreement to be filed within one year after the Closing Date, and shall use
commercially reasonable efforts to cause such registration statement to be
declared effective by the Commission as expeditiously as possible, and to
maintain the effectiveness of such registration statement for at least nine
months thereafter.

         SECTION 5.10 REQUIRED NOTIFICATIONS. The Company shall, within a
reasonable time after the Closing, notify the parties to those contracts listed
in Section 4.6(a) of the Company Disclosure Schedule and identified as requiring
notification upon a merger or a change in control affecting the Company.


                                   ARTICLE VI

                                   CONDITIONS

         SECTION 6.1 CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGER.
The respective obligations of each party to effect the Merger shall be subject
at its option to the fulfillment at or prior to the Effective Time of the
following conditions:

                  (a) this Agreement and the transactions contemplated hereby
shall have been approved and adopted by at least 95% in interest of the
shareholders of the Company;

                  (b) all statutory requirements for the valid consummation by
the Company, Parent and Merger Sub of the transactions contemplated by this
Agreement shall have been fulfilled; and all authorizations, waivers, consents,
approvals and actions of all federal and state governmental agencies and
authorities or other regulatory bodies required to be obtained in order to
permit consummation by the Company, the Company Shareholders, Parent and Merger
Sub of the transactions contemplated by this Agreement shall have been obtained,
without the imposition of a Burdensome Condition ("BURDENSOME CONDITION" shall
mean the imposition of a material restriction on Parent's ability to operate the
Company following the Effective Time or requiring the Parent to dispose of
assets of the Company or the Parent following the Effective Time), unless any of
the Parent, the Company Shareholders, or the Company voluntarily agrees to
satisfactorily resolve the Burdensome Condition;

                  (c) no court of competent jurisdiction shall have issued any
order, decree or injunction restraining or preventing the consummation of the
Merger or otherwise materially adversely affecting the transactions contemplated
by this Agreement;

                  (d) no investigation, action, suit or proceeding by any
governmental or regulatory commission, agency, body or authority, and no action,
suit or proceeding by any other



                                      -34-
<PAGE>

person, firm, corporation or entity, shall be pending on the Closing Date which
challenges, or might reasonably be expected to result in a challenge to, this
Agreement or the Merger or any other transaction contemplated hereby, or which
claims, or might reasonably be expected to give rise to a claim for, damages in
a material amount as a result of the consummation of the Merger or any other
transaction contemplated hereby;

                  (e) the Company, the Indemnification Representative, Merger
Sub, and Parent shall have executed and delivered the Escrow Agreement in
substantially the form of Exhibit B.

         SECTION 6.2 CONDITIONS TO OBLIGATION OF THE COMPANY AND THE COMPANY
SHAREHOLDERS TO EFFECT THE MERGER. The obligation of the Company and the Company
Shareholders to effect the Merger shall be subject at the option of the Company
to the fulfillment at or prior to the Effective Time of the following
conditions:

                  (a) Parent and Merger Sub shall have performed in all material
respects their agreements contained in this Agreement required to be performed
on or prior to the Effective Time; and the representations and warranties of
Parent and Merger Sub set forth in Article III hereof shall be true, correct and
complete as of the Effective Time as if made as of such time, except as
contemplated or permitted by this Agreement; and at the Closing the Company
shall have received certificates executed by the Presidents or Chief Executive
Officers of Parent and Merger Sub to the foregoing effects;

                  (b) no action, suit, claim, investigation or proceeding shall
be pending or threatened against the Parent or its properties and assets which,
if adversely determined, could reasonably be expected to have a material adverse
effect on the business, assets, condition (financial or otherwise) or result of
operations of Parent and its subsidiaries taken as a whole.

                  (c) at the Closing, there shall be delivered to the Company
and the Company Shareholders the opinion of Testa, Hurwitz & Thibeault, LLP,
counsel for Parent and Merger Sub, dated the Closing Date, in form and substance
satisfactory to the Company and its counsel and substantially as set forth in
Exhibit C.

                  (d) Parent shall have executed a Registration Rights Agreement
(the "REGISTRATION RIGHTS AGREEMENT") in substantially the form of Exhibit D;

                  (e) all corporate and other proceedings to be taken by Parent
and Merger Sub in connection with the transactions contemplated hereby and all
documents incident thereto shall be satisfactory in form and substance to the
Company and its counsel, and the Company and its counsel shall have received all
such counterpart originals or certified or other copies of such documents as
they reasonably may request;

                  (f) at the Closing, the Company and its counsel shall have
received copies of the following documents:

                        (i) (A) the Articles of Organization and Certificate of
Incorporation of Parent and Merger Sub, respectively, certified as of a recent
date by the Secretary of the



                                      -35-
<PAGE>

Commonwealth of the Commonwealth of Massachusetts and the Secretary of State of
the State of Delaware, and (B) a certificate of each said Secretary dated as of
a recent date as to the due incorporation and good standing of each of Parent
and Merger Sub, and listing all documents of each on file with said Secretary.

                        (ii) a certificate of the Clerk or Secretary of each of
Parent and Merger Sub dated the Closing Date and certifying: (A) that attached
thereto is a true and complete copy of the By-laws of the Parent and Merger Sub,
as the case may be, as in effect on the date of such certification; (B) that
attached thereto is a true and complete copy of all resolutions adopted by the
Board of Directors or the shareholders of Parent and Merger Sub, as the case may
be, authorizing the execution, delivery and performance of this Agreement and
the Merger, and that all such resolutions are in full force and effect and are
all the resolutions adopted in connection with the transactions contemplated by
this Agreement; (C) that the Articles of Organization or Certificate of
Incorporation of Parent and Merger Sub, as the case may be, have not been
amended since the date of the last amendment referred to in the certificate
delivered pursuant to clause (i)(B) above; and (D) to the incumbency and
specimen signature of each officer of Parent or Merger Sub, as the case may be,
executing this Agreement, and any certificate or instrument furnished pursuant
hereto, and a certification by another officer of Parent or Merger Sub, as the
case may be, as to the incumbency and signature of the officer signing the
certificate referred to in this clause.

                        (iii) a certificate of the President or Chief Financial
Officer of Parent dated the Closing Date and certifying as to the matters set
forth in Exhibit G.

                  (g) no material adverse change in the business, assets,
condition (financial or otherwise) or results of operations of Parent and its
subsidiaries taken as a whole shall have occurred; and

                  (h) the Company shall have the right to waive in writing any
of the foregoing conditions precedent.

         SECTION 6.3 CONDITIONS TO OBLIGATIONS OF PARENT AND MERGER SUB TO
EFFECT THE MERGER. The obligations of Parent and Merger Sub to effect the Merger
shall be subject at the option of Parent and Merger Sub to the fulfillment at or
prior to the Effective Time of the following conditions:

                  (a) the Company and each of the Company Shareholders shall
have performed in all material respects its agreements contained in this
Agreement required to be performed on or prior to the Effective Time and the
representations and warranties of the Company and the Company Shareholders set
forth in Article IV and IVA hereof, respectively, shall be true, correct and
complete as of the Effective Time as if made as of such time other than
representations or warranties that speak as of a particular date, which shall
continue to be true, correct and complete as of such date, and except as
contemplated or permitted by this Agreement; and at the Closing Parent and
Merger Sub shall have received a certificate executed by the President of the
Company and each Company Shareholder executing a counterpart signature page to
this Agreement to the foregoing effects;



                                      -36-
<PAGE>

                  (b) no action, suit, claim, investigation or proceeding shall
be pending or threatened against the Company or its properties and assets which,
if adversely determined, could reasonably be expected to have a material adverse
effect on the business, assets, condition (financial or otherwise) or results of
operations of the Company;

                  (c) At the Closing, there shall be delivered to Parent and
Merger Sub the opinion of Foley, Hoag & Eliot LLP, counsel for the Company and
the Company Shareholders, dated the Closing Date, in form and substance
satisfactory to Parent and Merger Sub and their counsel and substantially as set
forth in Exhibit E:

                  (d) Parent shall have received an unqualified written opinion
from Arthur Andersen, L.L.P., Parent's independent accountants, that both
parties to the Merger are poolable and that the Merger qualifies as a "pooling
of interests" under generally accepted accounting principles.

                  (e) the Company shall have received all Required Consents and
all consents, authorizations or approvals from the governmental agencies, as
well as all consents and waivers required under the Company's Restated
Certificate of Incorporation in each case in form and substance satisfactory to
Parent and Merger Sub and their counsel, and no such consent, authorization or
approval shall have been withdrawn;

                  (f) all corporate and other proceedings to be taken by the
Company in connection with the transactions contemplated hereby and all
documents incident thereto shall be satisfactory in form and substance to Parent
and Merger Sub and their counsel, and Parent and Merger Sub and their counsel
shall have received all such counterpart originals or certified or other copies
of such documents as they reasonably may request;

                  (g) At or prior to the Closing, Parent shall have received
copies of the following documents:

                        (i) (A) the Restated Certificate of Incorporation of the
Company and each subsidiary, certified as of a recent date by the Secretary of
State of the State of Delaware or a similar official in its jurisdiction of
incorporation and (B) a certificate of said Secretary dated as of a recent date
as to the due incorporation and good standing of the Company and each
subsidiary, and listing all documents of the Company and each subsidiary on file
with said Secretary.

                        (ii) A certificate of the Secretary of the Company dated
the Closing Date and certifying: (A) that attached thereto is a true and
complete copy of the By-laws of the Company and each subsidiary as in effect on
the date of such certification; (B) that attached thereto is a true and complete
copy of all resolutions adopted by the Board of Directors or the shareholders of
the Company authorizing the execution, delivery and performance of this
Agreement, and that all such resolutions are in full force and effect and are
all the resolutions adopted in connection with the transactions contemplated by
this Agreement; (C) that the Restated Certificate of Incorporation of the
Company has not been amended since the date of the



                                      -37-
<PAGE>

last amendment referred to in the certificate delivered pursuant to clause
(i)(B) above; and (D) as to the incumbency and specimen signature of each
officer of the Company executing this Agreement, and any certificate or
instrument furnished pursuant hereto, and a certification by another officer of
the Company as to the incumbency and signature of the officer signing the
certificate referred to in this clause (ii).

                        (iii) Such additional supporting documents and other
information with respect to the operations and affairs of the Company as Parent
and Merger Sub or their counsel reasonably may request.

                  (h) Parent shall be satisfied, in its sole discretion after
consultation with its counsel, that the issuance of Parent Common Stock
hereunder shall have been conducted in compliance with Regulation D of the
Securities Act;

                  (i) The Company shall have furnished Parent with a true and
complete copy of the audited balance sheets of the Company as of December 31,
1996 and December 31, 1997 and the audited statements of operations,
shareholders' equity and cash flows for the twelve months ended December 31,
1996 and December 31, 1997 .

                  (j) The Company shall have delivered to Parent a properly
executed statement satisfying the requirements of Treasury Regulation Sections
1.897-2(h) and 1.1445-2(c)(3) in a form reasonably acceptable to Parent;

                  (k) No material adverse change in the business, assets,
condition (financial or otherwise) or results of operations of the Company or
any subsidiary shall have occurred since the date of this Agreement.

                  (l) Holders of Outstanding Company Shares representing at
least ninety-five percent (95%) of the voting power of Company Shares entitled
to approve the Merger and the form of this Agreement shall have executed and
delivered the Company's Shareholders' Consent in favor of the transactions
contemplated herein.

                  (m) Each of Mark Galvin, Reed Simpson and Steve Nickerson
shall have executed an Employee Non-Disclosure, Invention and Covenant Not to
Compete Agreement in substantially the form of Exhibit F.

                  (n) With respect to all payments that would constitute "excess
parachute payments" (within the meaning of Section 280G of the Code) but for the
exceptions set forth in Sections 280G(b)(4) and 280G(b)(5) of the Code, the
Company shall obtain the shareholder approval described in Section 280G(b)(5)(B)
of the Code so that such payments will not be nondeductible under Section 280G
of the Code and will not be subject to the tax imposed under Section 4999 of the
Code.

                  (o) Parent and Merger Sub shall have the right in their sole
discretion to waive in writing any of the foregoing conditions precedent.



                                      -38-
<PAGE>

                  (p) Each Company Shareholder shall have executed a counterpart
signature page to this Agreement and the Escrow Agreement for purposes of
Article IV, Article IV-A and Article VII.


                                   ARTICLE VII

             SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS;
                                 INDEMNIFICATION

         SECTION 7.1 SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS. All
representations, warranties and covenants of the Company, Company Shareholders,
Parent and Merger Sub contained herein or in any schedule, document, written
statement, certificate or other instrument referred to herein or in the Escrow
Agreement shall survive the execution and delivery of this Agreement and the
Escrow Agreement, any investigation by or on behalf of the Company, the Company
Shareholders, Parent or Merger Sub, as the case may be, and the completion of
the transactions contemplated hereby and shall terminate on the first
anniversary of the Closing or, if sooner, the date of publication of audited
financial statements of Parent for the fiscal year ending December 31, 1999 (the
"INDEMNIFICATION TERMINATION DATE"); provided, however, that the aggregate
liability of each Company Shareholder under the Escrow Agreement shall be
limited as set forth in Section 1 of the Escrow Agreement; provided further,
however, that nothing in this Agreement or the Escrow Agreement shall be deemed
to limit any right or remedy for criminal activity or fraud, or to limit any
right or remedy against a Company Shareholder for breaches of covenants or
inaccuracies in any representations or warranties set forth in Section 4.18 or
Article IV-A hereof or the Registration Rights Agreement or for any expenses
incurred by Parent in connection with the Merger and on behalf of the Company in
excess of the limits set forth in Section 9.9 hereof.


                                  ARTICLE VIII

                        TERMINATION; AMENDMENT AND WAIVER

         SECTION 8.1 TERMINATION. This Agreement may be terminated at any time
prior to the Effective Time:

                  (a) By mutual written consent of Parent, Merger Sub and
Company;

                  (b) By Parent or Merger Sub, if there has been a material
breach of this Agreement on the part of the Company or any of the Company
Shareholders with respect to any of their covenants, representations or
warranties contained herein and such breach has not been cured by the earlier of
the time scheduled for the Closing under Section 1.6 hereof or within 10
business days after written notice thereof from Parent or Merger Sub;

                  (c) By Company, or a Company Shareholder if there has been a
material breach of this Agreement on the part of Parent or Merger Sub with
respect to any of their



                                      -39-
<PAGE>

covenants, representations or warranties contained herein and such breach has
not been cured by the earlier of the time scheduled for the Closing under
Section 1.6 hereof or within 10 business days after written notice thereof from
Company; or

                  (d) By Parent, Merger Sub or by Company if, at or before the
Closing, any conditions set forth herein for the benefit of Parent, Merger Sub
or Company, as the case may be, (i) shall not have been timely met or (ii) shall
have become impossible to satisfy; or

                  (e) By Parent, Merger Sub or by Company if: (i) the Closing of
the transactions contemplated by this Agreement shall not have occurred on or
before May 15, 1999 or such later date as may have been agreed upon in writing
by the parties hereto; provided, that the right to terminate this Agreement
under this clause (i) shall not be available to any party if such party's breach
of any representation, warranty or agreement contained in this Agreement has
been the cause of or resulted in the failure of the Closing to occur on or
before such date; (ii) there shall be a final nonappealable order of a federal
or state court in effect preventing consummation of the Merger; (iii) there
shall be any action taken, or any statute, rule, regulation or order enacted,
promulgated or issued or deemed applicable to the Merger by any governmental
agency or entity which would make consummation of the Merger illegal; or (iv)
there shall be any action taken, or any statute, rule, regulation or order
enacted, promulgated or issued or deemed applicable to the Merger by any
governmental agency or entity, which would (A) prohibit Parent's or the
Company's ownership or operation of all or a material portion of the business of
the Company, or compel Parent or the Company to dispose of or hold separate all
or a material portion of the business or assets of the Company or Parent as a
result of the Merger or (B) render Parent, Merger Sub or the Company unable to
consummate the Merger.

         The party desiring to terminate this Agreement shall give written
notice of such termination to the other parties.

         SECTION 8.2 EFFECT OF TERMINATION. In the event of termination of this
Agreement as provided above, this Agreement shall forthwith become void and
there shall be no liability on the part of either Parent, Merger Sub or the
Company, except (i) the provisions of Section 5.2(c) hereof shall survive
indefinitely; (ii) in the event this Agreement is terminated pursuant to Section
8.1(b), the reasonable, documented expenses incurred by the Parent on behalf of
the Parent shall be paid by the Company; and (iii) in the event this Agreement
is terminated pursuant to Section 8.1(c), the reasonable, documented expenses
incurred by the Company on behalf of the Company shall be paid by Parent. All
payments pursuant to this section shall be made within 30 days of a written
claim.

         SECTION 8.3 AMENDMENT. This Agreement may not be amended except by an
instrument in writing signed on behalf of the Company, a majority of the Company
Shareholders and the Parent.

         SECTION 8.4 WAIVER. At any time prior to the Effective Time, the
Company and Parent may (a) extend the time for the performance of any of the
obligations or other acts of the parties hereto, (b) waive any inaccuracies in
the representations and warranties contained herein or in any document delivered
pursuant hereto and (c) waive compliance with any of the agreements or



                                      -40-
<PAGE>

conditions contained herein. Any agreement on the part of the party hereto to
any such extension or waiver shall be valid if set forth in an instrument in
writing signed on behalf of such party.


                                   ARTICLE IX

                               GENERAL PROVISIONS

         SECTION 9.1 BROKERS. Except for NationsBanc Montgomery Securities LLC,
neither the Company nor the Company Shareholders have retained any investment
banker, broker, finder or other intermediary to act on behalf of such party and
who may be entitled to a fee or commission from the Parent or the Company, or
any affiliate thereof, in connection with, or upon consummation of, the
transactions contemplated by this Agreement.

         SECTION 9.2 NOTICES. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given if delivered in
person, by overnight courier, electronic facsimile or telex (and shall be deemed
to have been duly given on the date of delivery if so given), or by first class
mail (postage prepaid) (and shall be deemed to have been duly given the second
business day after the date of the postmark if so given) to the respective
parties as follows:

         If to Parent or Merger Sub:

                  Excel Switching Corporation
                  255 Independence Drive
                  Hyannis, MA  02601

         If to the Company:

                  RAScom, Inc.
                  5 Industrial Way
                  Salem, NH  03070


         If the Indemnification Representative:

                  Mark Galvin
                  RAScom, Inc.
                  5 Industrial Way
                  Salem, NH 03079
                  Telephone: (603) 870-4222
                  Facsimile: (603) 898-4242



                                      -41-
<PAGE>

         If the Indemnification Escrow Agent:

                  State Street Bank and Trust
                  Two International Place
                  Boston, MA 02110
                  Attn: Corporate Trust Department

or to such other address as any party may have furnished to the others in
writing in accordance herewith, except that notices of changes of address shall
only be effective upon receipt.

         SECTION 9.3 SUBSIDIARIES. When a reference is made in this Agreement to
subsidiaries of Parent or the Company, the word "SUBSIDIARIES" means any
corporation or other entity of which voting securities possessing voting power
sufficient to elect a majority of the Board of Directors or similar body are, at
the time which any determination is being made, beneficially owned by Parent or
Company, as the case may be.

         SECTION 9.4 HEADINGS. The descriptive headings in this Agreement have
been inserted for convenience only and shall not be deemed to limit or otherwise
affect the construction of any provision hereof.

         SECTION 9.5 ENTIRE AGREEMENT; ASSIGNMENT. This Agreement, including the
Parent and Company Disclosure Schedules, the Escrow Agreement and the
Registration Rights Agreement constitute the entire agreement among the parties
with respect to the subject matter hereof and thereof and supersede all other
prior agreements and understandings, both written and oral, among the parties or
any of them with respect to the subject matter hereof and thereof. This
Agreement shall not be assigned by operation of law or otherwise.

         SECTION 9.6 PARTIES IN INTEREST. This Agreement shall be binding upon
and inure solely to the benefit of the parties hereto, and nothing in this
Agreement, express or implied, is intended to confer upon any other person any
rights or remedies of any nature whatsoever under or by reason of this
Agreement.

         SECTION 9.7 VALIDITY. The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provisions of this Agreement, each of which shall remain in full force
and effect, provided that enforcement of such other provisions in the absence of
the invalid or unenforceable provisions does not deprive either the Company, the
Company Shareholders or Parent of the benefit of the bargain.

         SECTION 9.8 COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original but all of which
shall constitute one and same Agreement.

         SECTION 9.9 EXPENSES. Except as provided in Section 8.2, all costs and
expenses incurred in connection with the transactions contemplated by this
Agreement shall be paid by Parent if such costs and expenses were incurred on
behalf of Parent, its shareholders or Merger Sub and by the Company Shareholders
if such costs and expenses were incurred on behalf of the



                                      -42-
<PAGE>

Company or the Company Shareholders; all fees and expenses of Arthur Andersen,
L.L.P. shall be deemed to be incurred on behalf of Parent. If the Merger is
consummated, Parent shall pay (i) the reasonable, documented expenses incurred
by the Company for accountants and attorneys incurred on behalf of the Company
and in connection with the Merger up to a maximum amount not to exceed $125,000,
and (ii) the fee of NationsBanc Montgomery Securities LLC in connection with the
Merger, which fee shall be $750,000; provided, any amounts in excess of such
$125,000 or $750,000 amount, as applicable, shall be borne by the Company
Shareholders and not the Company, Merger Sub or Parent and shall be paid in full
at the Closing. To the extent such expenses in excess of $875,000 become a
liability or debt of the Company, Merger Sub or Parent, such excess shall be
offset against the Indemnification Escrow Shares. Except as provided in Section
8.2, in the event the Merger is not consummated, all costs and expenses incurred
by the Company shall be paid by the Company.

         SECTION 9.10 GOVERNING LAW. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware, regardless of
the laws that might otherwise govern under applicable principles of conflicts of
laws thereof.



                                      -43-
<PAGE>

         IN WITNESS WHEREOF, Parent, Merger Sub, the Company, the Company
Shareholders and the Indemnification Representative have caused this Agreement
to be signed by their respective officers thereunto duly authorized, and their
respective seals to be affixed hereto, as of the date first written above.


                                         EXCEL SWITCHING CORPORATION

                                         By:  /s/ Robert P. Madonna
                                              -----------------------------
                                         Title: President and Chief
                                                Executive Officer
                                                ---------------------------


                                         RACEPOINT ACQUISITION CORPORATION

                                         By:  /s/ Robert P. Madonna
                                              -----------------------------
                                         Title: President
                                                ---------------------------


                                         RASCOM, INC.

                                         By:  /s/ Mark B. Galvin
                                              -----------------------------
                                         Title: President
                                                ---------------------------


                                         /s/ Mark B. Galvin
                                         ----------------------------------
                                         Name:  Mark B. Galvin
                                         as Indemnification Representative


                                         Company Shareholders:




                                         /s/ Mark B. Galvin
                                         ----------------------------------
                                         Mark Galvin
                                         Address:  69 Indian Ridge Road
                                                   East Hempstead, NH  03826

                                      -44-

<PAGE>

                                         /s/ Aaron A. Galvin
                                         /s/ Frayda Galvin
                                         ----------------------------------
                                         Aaron A. Galvin and Frayda Galvin
                                         Address:  130 Mt. Auburn Street
                                                   Cambridge, MA  02138


                                         /s/ Allan M. Kline
                                         ----------------------------------
                                         Allan M. Kline
                                         Address:  34 Philips Road
                                                   Sudbury, MA  01776


                                         /s/ Allen A. Hauf
                                         ----------------------------------
                                         Allen A. Hauf
                                         Address:  60 Brucewood East
                                                   Acton, MA  01720


                                         /s/ Arnold B. Denton
                                         ----------------------------------
                                         Arnold B. Denton
                                         Address:  36 The Garrison
                                                   Dover, NH  03820


                                         /s/ C.W. Dick
                                         ----------------------------------
                                         C.W. Dick
                                         Address:  19 Thoreau Circle
                                                   Beverly, MA  01915


                                         CHARLES RIVER PARTNERSHIP VII
                                         1000 Winter Street, Suite 3300
                                         Waltham, MA 02154


                                         By: /s/ Michael Zak
                                             ------------------------------
                                         Title: General Partner
                                                ---------------------------


                                         /s/ Chris Carroll
                                         ----------------------------------
                                         Chris Carroll
                                         Address:  120 Gray Street
                                                   North Andover, MA  01845

                                      -45-

<PAGE>

                                         /s/ Dennis A. Kirshy
                                         ----------------------------------
                                         Dennis A. Kirshy
                                         Address:  26 Cart Path Road
                                                   Weston, MA  02193


                                         /s/ Edward J. Los
                                         ----------------------------------
                                         Edward J. Los
                                         Address:  7 Cheyenne Drive
                                                   Nashua, NH  03063


                                         FIRST ALBANY CORPORATION
                                         CUSTODIAN FBO JAMES C. SCHWALBE IRA
                                         7 Carousel Court
                                         Londonderry, NH  03053


                                         By:  /s/ Matthew Hurley
                                              -----------------------------
                                         Title: Supervisor
                                                ---------------------------

                                         By:  /s/ Scott Perkins
                                              -----------------------------
                                         Title: Guarantor
                                                ---------------------------


                                         /s/ Geoffrey Devin
                                         ----------------------------------
                                         Geoffrey Devine
                                         Address:  P.O. Box 233
                                                   Salem, NH  03079


                                         /s/ Gerald A. Friesen
                                         ----------------------------------
                                         Gerald A. Friesen
                                         Address:  1300 Chinquapin Road
                                                   Churchville, PA 18966


                                         /s/ Gilbert M. Kaufman
                                         ----------------------------------
                                         Gilbert M. Kaufman
                                         Address:  19 Grist Mill Road
                                                   Acton, MA  01720

                                      -46-

<PAGE>

                                         HARBOURVEST PARTNERS V -
                                         DIRECT FUND L.P.
                                         One Financial Center
                                         Boston, MA  02109

                                         By: HVP V - Direct Associates L.L.C.
                                         Its: General Partner

                                         By: Harbour Vest Partners, LLC
                                         Its: Managing Member

                                         By:  /s/ Ofer Nemerovsky
                                              -----------------------------
                                         Title: Managing Director
                                                ---------------------------


                                         /s/ Harry Newton
                                         ----------------------------------
                                         Harry Newton
                                         Address:  12 West 21st Street
                                                   New York, NY  10010


                                         INTERSTOCK ANSTALT
                                         Herrengasse 21
                                         P.O. Box 339
                                         FL-9490 Vaduz
                                         LICHTENSTEIN

                                         By: /s/ Heimo Quaderer
                                             /s/ Edith Hueppi
                                            -------------------------------
                                         Title: Directors
                                               ----------------------------


                                         /s/ James C. Schwalbe
                                         ----------------------------------
                                         James C. Schwalbe
                                         Address:


                                         /s/ Jeffery S. Basile
                                         ----------------------------------
                                         Jeffery S. Basile
                                         Address:  24 Southgate Road
                                                   Hollis, NH  03049


                                         /s/ Joseph C. Genovese
                                         ----------------------------------
                                         Joseph C. Genovese
                                         Address:  24 Mill Street
                                                   Lincoln, MA  01773

                                      -47-

<PAGE>

                                         /s/ Joseph H. Reilly
                                         ----------------------------------
                                         Joseph H. Reilly
                                         Address:  41 Pilgrim Street, #201
                                                   Cambridge, MA  03087


                                         /s/ Kathryn Barrie
                                         ----------------------------------
                                         Kathryn Barrie
                                         Address:  277 Harrantis Lake Road
                                                   Chester, NH  03036


                                         /s/ Kenneth M. Stess
                                         ----------------------------------
                                         Kenneth M. Stess
                                         Address:  26 Chandler Drive
                                                   Atkinson, NH  03811


                                         /s/ Kevin D. Smith
                                         /s/ Kathryn B. Smith
                                         ----------------------------------
                                         Kevin D. and Kathryn B. Smith
                                         Address:  15 Varley Drive
                                                   Hanata, Ontario K2K 1E7
                                                   CANADA


                                         /s/ Kevin Dick
                                         ----------------------------------
                                         Kevin Dick
                                         Address:  37 Riverdale Avenue
                                                   Bradford, MA  01835


                                         /s/ Kimberly A. Ward
                                         ----------------------------------
                                         Kimberly A. Ward
                                         Address:  6 Harmony Drive
                                                   Londonderry, NH  03053

                                      -48-

<PAGE>

                                         LE SERRE
                                         c/o Frank M. Polestra
                                         Ascent Venture Management, Inc.
                                         60 State Street, 19th Floor
                                         Boston, MA  02109


                                         By: /s/ Frank Polestra
                                             ------------------------------
                                         Title: Partner
                                                ---------------------------


                                         /s/ Leigh Michl
                                         ----------------------------------
                                         Leigh Michl
                                         Address:  74 Cherry Brook Road
                                                   Weston, MA  02193


                                         /s/ Louis Piazza
                                         ----------------------------------
                                         Louis Piazza
                                         Address:  11 Carter Lane
                                                   Andover, MA  01810


                                         /s/ Marcia Haskel
                                         ----------------------------------
                                         Marcia Haskel
                                         Address:  8 Ivanhoe Lane
                                                   Andover, MA  01810


                                         /s/ Margo Bik
                                         /s/ Nicholas Bik
                                         ----------------------------------
                                         Margo and Nicholas Bik
                                         Address:  132 Farm Street
                                                   Balckstone, MA  01504


                                         /s/ Michael Barza
                                         ----------------------------------
                                         Michael Barza
                                         Address:  46 Tudor Road
                                                   Chestnut Hill, MA  02167


                                         /s/ Michael J. Wood
                                         ----------------------------------
                                         Michael J. Wood
                                         Address:  11 Lori Road
                                                   Derry, NH  03038

                                      -49-

<PAGE>

                                         /s/ Mitchel Sayare
                                         /s/ Susan E. Whitehead
                                         ----------------------------------
                                         Mitchel Sayare and Susan E. Whitehead
                                         Address:  15 Woodcliff Avenue
                                                   Wellesley, MA  02181


                                         /s/ Naresh C. Parmer
                                         ----------------------------------
                                         Naresh C. Parmer
                                         Address:  36 Adelman Road
                                                   Billerica, MA  01821


                                         /s/ Peter Livingstone
                                         ----------------------------------
                                         Peter Livingstone
                                         Address:  2 Elmwood Avenue, Apt. 35
                                                   Winchester, MA  01890


                                         /s/ Peter S. Rood
                                         ----------------------------------
                                         Peter S. Rood
                                         Address:  6 High Ridge Road
                                                   Franklin, MA  02038


                                         /s/ Philip Arrigo
                                         /s/ Frances Arrigo
                                         ----------------------------------
                                         Philip Arrigo and Frances Arrigo
                                         Address:  74 Governor Dinsmore
                                                   Windham, NH  03087


                                         PCC TRANSFER LIMITED
                                         PARTNERSHIP
                                         60 State Street, 19th Floor
                                         Boston, MA 02109


                                         By: /s/ Frank Polestra
                                             ------------------------------
                                         Title: Manager
                                                ---------------------------

                                      -50-

<PAGE>

                                         PIONEER VENTURES LIMITED
                                         PARTNERSHIP II
                                         60 State Street
                                         Boston, MA  02109


                                         By: /s/ Frank Polestra
                                             ------------------------------
                                         Title: President
                                                ---------------------------


                                         /s/ R. Stephen Cheheyl
                                         ----------------------------------
                                         R. Stephen Cheheyl
                                         Address:  130 Lane's End
                                                   Concord, MA  01742


                                         /s/ Reid L. Simpson
                                         ----------------------------------
                                         Reid L. Simpson
                                         Address:  141 Greenwood Road
                                                   Andover, MA  01810


                                         /s/ Robert J. Grochmal
                                         ----------------------------------
                                         Robert J. Grochmal
                                         Address:  6 Independence Avenue
                                                   Derry, NH  03038


                                         /s/ Robert J. Grochmal
                                         /s/ Debra A. Grochmal
                                         ----------------------------------
                                         Robert J.Grochmal and Debra A.Grochmal,
                                         JTWROS
                                         Address:  6 Independence Avenue
                                                   Derry, NH  03038

                                      -51-

<PAGE>

                                         /s/ Rodger P. Nordblom
                                         ----------------------------------
                                         Rodger P. Nordblom
                                         Address:  c/o Nordblom Company
                                                   31 Third Avenue
                                                   Brighton, MA  01803


                                         /s/ Ron Pullis
                                         ----------------------------------
                                         Ron Pullis
                                         Address:  42527 S.E. 175th Place
                                                   North Bend, WA  98045


                                         /s/ Rubin Gruber
                                         ----------------------------------
                                         Rubin Gruber
                                         Address:  709 Sudbury Road
                                                   Concord, MA  01742


                                         /s/ Stefan Gieseler
                                         ----------------------------------
                                         Stefan Gieseler
                                         Address:  Erbstollen 8A
                                                   44797 Bochum
                                                   GERMANY


                                         /s/ Steven A. Mulawski
                                         ----------------------------------
                                         Steven A. Mulawski
                                         Address:  6 Virginia Road
                                                   Tyngsboro, MA  01879


                                         SVE STAR VENTURES ENTERPRISES NO. V,
                                         a German Civil Law Partnership
                                         (with Limitation of Liability)
                                         Possart Strasse 9
                                         D-81679 Munich
                                         GERMANY

                                         By: SVM Star Ventures
                                         Managementgesellschaft mbH Nr. 3
                                         Its: Managing Partner

                                         By: /s/ Meir Barel
                                             ------------------------------
                                         Title: Managing Director
                                                ---------------------------

                                      -52-

<PAGE>

                                         SVM STAR VENTURES
                                         MANAGEMENTGESELLSCHAFT MBH
                                         Nr. 3 & Co. KG
                                         Possart Strasse 9
                                         D-81679 Munich
                                         GERMANY

                                         By: SVM Star Ventures
                                         Managementgesellschaft mbH Nr. 3
                                         Its:  Managing Partner

                                         By: /s/ Meir Barel
                                             ------------------------------
                                         Title: Managing Partner
                                                ---------------------------


                                         /s/ Terry R. Young
                                         ----------------------------------
                                         Terry R. Young
                                         Address:  4 Aiken Street
                                                   Derry, NH  03038


                                         THE MHF SYLVAN FUND
                                         63 Sylvan Lane
                                         Weston, MA 02193


                                         By: /s/ Edward Saxe
                                             ------------------------------
                                         Title: Trustee
                                                ---------------------------


                                         /s/ Thomas W. Mullaney, Jr.
                                         ----------------------------------
                                         Thomas W. Mullaney, Jr.
                                         Address:  11 Seaview Drive
                                                   Newbury, MA  01951


                                         /s/ Warren J. Maxwell
                                         ----------------------------------
                                         Warren J. Maxwell
                                         Address:  72 High Road
                                                   Newbury, MA  01951

                                      -53-

<PAGE>

                                         WATERLINE CAPITAL, LLC
                                         c/o Alexander M. Levine
                                         790 Boylston Street
                                         Boston, MA  02199

                                         By: /s/ Alexander M. Levine
                                             ------------------------------
                                         Title: Managing Director
                                                ---------------------------


                                         /s/ Richard Hannapel
                                         ----------------------------------
                                         Richard Hannapel
                                         Address:


                                         /s/ Joseph A. Keelan
                                         ----------------------------------
                                         Joseph A. Keelan
                                         Address:  139 Plain Road
                                                   Westford, MA  01886


                                         CASSIE DALTON STESS TRUST
                                         c/o Kenneth Stess

                                         By: /s/ Kenneth Stess
                                             ------------------------------
                                         Title: Trustee
                                                ---------------------------

In accordance with Item 601 (b)(2) of Regulation S-K, the Schedules and certain
Exhibits to this Agreement have not been filed. Specifically, the Parent
Disclosure Schedule and the Company Disclosure Schedule (as those terms are
defined in the Merger Agreement) have been omitted. The omitted schedules
principally contain disclosure information with respect to Excel and RAScom
which supplement both Excel's and RAScom's representations and warranties and
consist of, among other things, various corporate matters, financial matters,
liabilities, properties, employee matters, material contracts, and other
matters. In addition, Exhibit A (Certificate of Merger), Exhibit C (Form of
Opinion to be issued by Testa, Hurwitz & Thibeault, LLP), Exhibit E (Form of
Opinion to be issued by Foley, Hoag & Eliot LLP), Exhibit F (Form of Employee
Non Disclosure, Invention & Covenant Not to Compete Agreement) and Exhibit G
(Form of Representation by President or Chief Financial Officer of Excel) have
been omitted. Exhibit G contains representations of Excel concerning certain tax
matters. The Registrant hereby agrees to furnish supplementally a copy of any
omitted schedule or exhibit to the Commission upon request.



                                                                     EXHIBIT 2.2
                                                                     -----------

       AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER AND REORGANIZATION

     This Amendment No. 1 (this "AMENDMENT") to the Agreement and Plan of Merger
and Reorganization dated as of April 15, 1999 (the "MERGER AGREEMENT"), by and
among Excel Switching Corporation, a Massachusetts corporation ("PARENT"),
Racepoint Acquisition Corporation, a Delaware corporation and a wholly-owned
subsidiary of Parent ("MERGER SUB"), RAScom, Inc., a Delaware corporation (the
"COMPANY"), those certain shareholders of the Company set forth on the signature
pages thereof (the "COMPANY SHAREHOLDERS"), and Mark B. Galvin as the
"Indemnification Representative identified therein (the "INDEMNIFICATION
REPRESENTATIVE"), is entered into by and among Parent, the Company, those
stockholders of the Company whose signatures appear below and the
Indemnification Representative as of this 7th day of May, 1999.

     WHEREAS, the parties to this Amendment and others have entered into the
Merger Agreement;

     WHEREAS, Section 8.3 of the Merger Agreement provides that the Merger
Agreement may not be amended except by an instrument in writing signed on behalf
of the Company, a majority of the Company Shareholders and Parent;

     WHEREAS, the parties hereto desire to amend the Merger Agreement as set
forth below, and constitute a sufficient percentage of the Company Shareholders
and each other party specified in Section 8.3 of the Merger Agreement required
to take such action;

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereby agree as
follows:

     1.       Amendment of Merger Agreement. The Merger Agreement is hereby
amended by adding, at the end of Section 2.2(b) thereof, the following new
sentence:

                      Without limiting the foregoing, and notwithstanding the
              prior execution of the Escrow Agreement by the parties thereto in
              the form attached as Exhibit B hereto, the Indemnification
              Representative shall be authorized, in his capacity as
              Indemnification Representative and on behalf of the Company
              Shareholders, to enter into such additional agreement with Parent,
              Merger Sub, the Company and the Indemnification Escrow Agent as
              may be reasonably requested by the Indemnification Escrow Agent
              for the purpose of clarifying or more fully setting forth the
              rights and responsibilities of the Indemnification Escrow Agent
              under the Escrow Agreement; provided, that no such additional
              agreement shall have the effect of enlarging the scope of the
              indemnification obligations of the Company Shareholders, extending
              the Escrow Termination Date, as defined in the Escrow Agreement,
              increasing the number of Indemnification Escrow Shares to be
              delivered to the Indemnification Escrow Agent or providing for
              disparate treatment among similarly situated Company Shareholders
              except to the extent already provided for in the Escrow Agreement.

<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of
the date first written above.



                                 EXCEL SWITCHING CORPORATION

                                 By: /s/ Christopher Stavros
                                     -------------------------------------
                                 Title: Vice President and General Counsel
                                        ----------------------------------


                                 RACEPOINT ACQUISITION CORPORATION

                                 By: /s/ Christopher Stavros
                                     -------------------------------------
                                 Title: Vice President
                                        ----------------------------------


                                 RASCOM, INC.

                                 By: /s/ Mark Galvin
                                     -------------------------------------
                                     Mark Galvin, President


                                 /s/ Mark Galvin
                                 -----------------------------------------
                                 Mark Galvin, as a Company Shareholder
                                 and as Indemnification Representative


                                 CHARLES RIVER PARTNERSHIP VII

                                 By: /s/ Michael Zak
                                     -------------------------------------
                                 Title: General Partner
                                        ----------------------------------



                                 PCC TRANSFER LIMITED PARTNERSHIP

                                 By: /s/ Frank Polestra
                                     -------------------------------------
                                 Title: Manager
                                        ----------------------------------

<PAGE>


                                 PIONEER VENTURES LIMITED PARTNERSHIP II

                                 By: /s/ Frank Polestra
                                     -------------------------------------
                                 Title: President
                                        ----------------------------------


                                 HARBOURVEST PARTNERS V -
                                 DIRECT FUND L.P.
                                 One Financial Center
                                 Boston, MA  02109

                                 By: HVP V - Direct Associates L.L.C.
                                 Its: General Partner

                                 By: Harbour Vest Partners, LLC
                                 Its: Managing Member

                                 By: /s/ Ofer Nemerovsky
                                     -------------------------------------
                                 Title: Managing Director
                                        ----------------------------------


                                                                     EXHIBIT 4.1
                                                                     -----------

                                ESCROW AGREEMENT


         Agreement dated as of May 10, 1999, by and among Excel Switching
Corporation, a Massachusetts corporation ("Parent"), Racepoint Acquisition
Corporation, a Delaware corporation and a wholly-owned subsidiary of Parent
("Merger Sub"), RAScom, Inc., a Delaware corporation (the "Company"), State
Street Bank and Trust Company (the "Indemnification Escrow Agent"), Mark B.
Galvin (the "Indemnification Representative") and each of the Shareholders of
the Company identified on the signature page hereto (the "Company
Shareholders").

         WHEREAS, the Parent, Merger Sub, the Company and the Company
Shareholders have entered into an Agreement and Plan of Merger and
Reorganization (the "Merger Agreement") dated as of April 15, 1999; and

         WHEREAS, the Merger Agreement provides for the designation of Mark B.
Galvin as the Indemnification Representative with all the powers and authority
ascribed to the Indemnification Representative herein; and

         WHEREAS, it is a condition of the Merger Agreement that the parties
thereto enter into this Agreement.

         NOW, THEREFORE, in consideration of the premises and agreements set
forth below, the parties agree as follows:


         SECTION 1  SURVIVAL OF REPRESENTATIONS, WARRANTIES AND COVENANTS. As
provided in the Merger Agreement, all representations, warranties and covenants
of the Company, Company Shareholders, Parent and Merger Sub contained therein or
in any other agreement, schedule, document, written statement, certificate or
other instrument delivered by or on behalf of the Company, Company Shareholders,
Parent or Merger Sub, as the case may be, pursuant to the terms of this
Agreement or the Merger Agreement shall survive the execution and delivery of
this Agreement and the Merger Agreement, any investigation by or on behalf of
the Company, the Company Shareholders, Parent or Merger Sub, as the case may be,
and the completion of the transactions contemplated hereby and thereby and shall
terminate on the "Indemnification Termination Date", as that term is defined in
Section 7.1 of the Merger Agreement. The aggregate liability of each Company
Shareholder under this Agreement and the Merger Agreement shall be limited to
fifteen percent (15%) of the value of the Parent Common Stock, including the
Indemnification Escrow Shares, and cash received by such Company Shareholder at
the Effective Time pursuant to Article II of the Merger Agreement (the
"Limitation Amount"); provided, however, that nothing in this Agreement or the
Merger Agreement shall be deemed to limit any right or remedy of Parent or the
Surviving Corporation for criminal activity or fraud, or breaches by any Company
Shareholder of covenants or inaccuracies in any representations or warranties
set forth in any Registration Rights Agreement or for breaches by the Company or
any Company Shareholder of the

<PAGE>

                                       -2-

representations, warranties or covenants set forth in Section 4.18 or Article
IV-A of the Merger Agreement or for any expenses incurred by Parent in
connection with the Merger and on behalf of the Company in excess of the limits
set forth in Section 9.9 of the Merger Agreement. The value of each share of
Parent Common Stock hereunder shall be $25.64375, which represents the ten (10)
trading day average of the closing sale price per share of the Parent Common
Stock on the Nasdaq National Market from March 15, 1999 through March 26, 1999.
Any capitalized term herein not otherwise defined shall have the meaning
ascribed to such term in the Merger Agreement.

         Parent and the Surviving Corporation shall not be entitled to
indemnification pursuant to Section 2 hereof until the aggregate amount of all
losses, expenses, liabilities and other damages suffered by Parent or the
Surviving Corporation exceeds $300,000 (including attorney's fees and expenses
incurred in connection therewith) (the "Indemnity Threshold") whereupon Parent
and the Surviving Corporation shall be entitled to indemnification hereunder for
the aggregate amount of all of such losses, expenses, liabilities and other
damages suffered by Parent or the Surviving Corporation exceeding $300,000. The
Indemnity Threshold shall be determined without regard to any materiality
qualification contained in any representation or warranty and shall not apply
with respect to claims under Section 8.2 or with respect to Section 4.18 or
Article IV-A of the Merger Agreement or for any expenses incurred by Parent in
connection with the Merger on behalf of the Company in excess of the limits set
forth in Section 9.9 of the Merger Agreement.


         SECTION 2  INDEMNIFICATION.

                  (a) Parent and the Surviving Corporation shall be indemnified
and held harmless by the Company Shareholders against any loss, expense,
liability or other damage (including reasonable legal and accounting fees and
costs) suffered by Parent or the Surviving Corporation through the
Indemnification Termination Date resulting from:

                           (i) any inaccuracy in or breach of any of the
representations, warranties, or covenants made by the Company or a Company
Shareholder in the Merger Agreement, as modified and supplemented by the Company
Disclosure Schedule, or any certificate issued by the Company or a Company
Stockholder pursuant to Sections 6.3(a), 6.3(g) and 6.3(j) of the Merger
Agreement; or

                           (ii) any expenses and fees incurred by the
Indemnification Representative pursuant to Section 6(c) hereof or incurred by
Parent in connection with the Merger on behalf of the Company in excess of the
limits set forth in Section 9.9 of the Merger Agreement; or

                           (iii) the failure of any Company Product shipped by
the Company prior to the Closing Date to meet the standards set forth for Year
2000 Compliance as such term is described in Section 4.15 of the Merger
Agreement.

<PAGE>

                                       -3-

                  (b) In case any event shall occur which would otherwise
entitle any of the parties to assert a claim for indemnification hereunder, no
loss, damage or expense shall be deemed to have been sustained by such party to
the extent of any proceeds received by such party from any insurance policies
with respect thereto.

                  (c) The indemnification obligations of the Company
Shareholders hereunder shall be joint and several, except as set forth below.
The indemnity obligations of the Company Shareholders in respect of Article IV-A
of the Merger Agreement shall be several and not joint, and shall apply, in the
case of any particular Company Shareholder, only to losses arising out of the
breach by such Company Stockholder of his representations and warranties in such
Article.


         SECTION 3  DISTRIBUTIONS AND CLAIMS.

                  (a) Upon obtaining knowledge of any facts, claim or demand
which has given rise to, or could reasonably give rise to, a claim for
indemnification hereunder (referred to herein as an "Indemnification Claim"),
Parent or the Surviving Corporation, as applicable (the "Indemnified Party"),
shall promptly give written notice of such facts, claim or demand ("Notice of
Claim") to the party from whom indemnification is sought (the "Indemnifying
Party") as described below. The Indemnified Party shall give the Notice of Claim
to either (i) the Indemnification Representative and to the Indemnification
Escrow Agent if the Notice of Claim is given prior to the earlier of (x) one (1)
year from the Effective Time and (y) publication of Parent's audited financial
results for the year ended December 31, 1999 (the "Escrow Termination Date") or
(ii) the Company Shareholder(s) against whom the Parent is asserting the
Indemnification Claim if the Notice of Claim is given after the date all
Indemnification Escrow Shares have been delivered to Parent or the Surviving
Corporation in satisfaction of other Indemnification Claims. Parent shall give
written notice to the Indemnification Escrow Agent and the Indemnification
Representative of the publication of Parent's audited financial results for the
year ended December 31, 1999. Such notice shall also set forth the Escrow
Termination Date. Parent or the Surviving Corporation, as applicable, shall not
be entitled to give a Notice of Claim after the Indemnification Termination Date
except with respect to any matter which was the subject of a Notice of Claim
given prior to such date.

                  The Notice of Claim shall set forth the amount of the loss,
expense, liability or other damage suffered, or which may be suffered, by the
Indemnified Party, and, in the case of a Notice of Claim delivered pursuant to
clause (ii) above, the amount to be paid by the Company Shareholder(s). So long
as the Notice of Claim is given by the Indemnified Party prior to the
Indemnification Termination Date, no failure or delay by the Indemnified Party
in the giving of a Notice of Claim shall reduce or otherwise affect the
Indemnified Party's right to indemnification hereunder except to the extent that
the Indemnifying Party has been prejudiced thereby.
The date of a Notice of Claim shall be deemed to be:

<PAGE>

                                       -4-

                           (x) the second business day after the date of the
                     postmark on the registered or certified mail (postage
                     prepaid, return receipt requested) containing the Notice of
                     Claim; or

                           (y) if the Notice of Claim is personally delivered,
                     the date of such personal delivery.

                  (b)      (i) Upon receipt of a Notice of Claim at any time
after the Indemnity Threshold has been reached and prior to the Escrow
Termination Date, the Indemnification Escrow Agent shall, subject to the
provisions of Section 3(b)(ii) hereof, deliver to Parent, as promptly as
practicable after expiration of the twenty-day notice period set forth in clause
(ii) below, Indemnification Escrow Shares with a value equal to the amount of
the loss, expense, liabilities or other damage set forth in the Notice of Claim
(as determined pursuant to Section 1 and rounded up to the nearest whole share).

                           (ii) The Indemnification Representative shall have
twenty (20) days from the date of a Notice of Claim within which to object, by
written notice of objection given to Parent and the Indemnification Escrow
Agent, to any Indemnification Claim (a "Challenged Claim"). If notice of
objection to any such claim is not provided by the Indemnification
Representative, the validity and stated amount of the claim and the number of
Indemnification Escrow Shares to be delivered will be deemed to have been
accepted (such claims being referred to herein as "Accepted Claims"). The
Indemnification Representative, Parent and Surviving Corporation shall submit
the matter of a Challenged Claim to arbitration in accordance with Section 9
hereof. If a Notice of Claim sets forth a claim or demand asserted by a third
party (a "Third Party Claim"), the provisions of Section 3(d) shall also apply.

                           (iii) The Indemnification Escrow Agent shall retain
in escrow after the Escrow Termination Date the number of Indemnification Escrow
Shares having a value (as determined pursuant to Section 1 and rounded up to the
nearest whole share) equal to the dollar amount of all Challenged Claims and
pending or threatened Indemnification Claims which have not been finally
determined ("Pending Claims"). The "dollar amount" of any Pending
Indemnification Claim shall be calculated assuming the maximum possible exposure
set forth in the Notice of Claim, except, however, that, with respect to a
Pending Indemnification Claim for which legal action has not been taken against
Parent or the Surviving Corporation within one year following the Notice of
Claim (the "Period"), then the dollar amount of such Pending Indemnification
Claim shall be as agreed upon by Parent and the Indemnification Representative,
and if they cannot agree within 90 days of the end of the Period, then such
dollar amount shall be determined by arbitration in accordance with Section 9
herein.

                           (iv) As promptly as practicable after the Escrow
Termination Date, the Indemnification Escrow Agent shall deliver to the Company
Shareholders the balance of the Indemnification Escrow Shares not delivered to
Parent or the Surviving Corporation, as applicable, or retained in escrow
pursuant to Section 3(b)(iii). Each Company Shareholder shall receive his
proportional share interest in such distribution, to

<PAGE>

                                       -5-

be determined as follows: the number of Indemnification Escrow Shares to be
distributed to each Company Shareholder shall be equal to a percentage of the
remaining Indemnification Escrow Shares determined by dividing (A) the sum of
the number of Indemnification Escrow Shares delivered to the Escrow Agent at the
Closing for the account of such Company Shareholder, less the number of
Indemnification Escrow Shares distributed by the Escrow Agent for the account of
such Company Shareholder in respect of Indemnification Claims for which other
Company Shareholders were not jointly liable by (B) the sum of the remaining
number of Indemnification Escrow Shares plus the aggregate number of
Indemnification Escrow Shares distributed by the Escrow Agent in respect of
Indemnification Claims for which the Company Shareholders were jointly liable.

                           (v) Upon receipt of a Notice of Claim at any time
after (i) the Indemnity Threshold has been reached and (ii) the date all
Indemnification Escrow shares have been delivered to Parent, and prior to the
Indemnification Termination Date, a Company Shareholder shall, subject to the
provisions of Section 3(b)(vi) hereof, deliver to Parent within five (5) days of
the expiration of the twenty-day notice period set forth in clause (vi) below,
shares of Parent Common Stock acquired in the Merger, or, in the event that such
Company Shareholder no longer owns shares of Parent Common Stock acquired in the
Merger, cash, having a value (as determined under Section 1 above) equal to the
amount set forth in the Notice of Claim or, if less, an amount equal to the
Limitation Amount in respect of such Company Shareholder, determined pursuant to
Section 1 above, less the value of the Indemnification Escrow Shares delivered
to the Escrow Agent for the account of such Company Shareholder at the Effective
Time, determined pursuant to Section 1 above.

                           (vi) A Company Shareholder shall have twenty (20)
days from the date of a Notice of Claim within which to object, by written
notice to Parent, to any Indemnification Claim (a "Shareholder Challenged
Claim"). If notice of objection to any such claim is not provided by the Company
Shareholder, the validity and stated amount of the claim will be deemed to have
been accepted. The parties shall submit the matter of a Shareholder Challenged
Claim to arbitration in accordance with Section 9 hereof. If a Notice of Claim
sets forth a Third Party Claim the provisions of Section 3(d) shall also apply.

                  (c) Indemnification Escrow Shares that are not distributed to
the Company Shareholders on the Escrow Termination Date because they have been
retained pursuant to Section 3(b)(iii) shall be distributed (as appropriate) as
promptly as practicable after disposition of each such Indemnification Claim.
Upon the date after which the last of all Challenged Claims and all other
Indemnification Claims has been finally determined and the final distribution
has been made to Parent (and to the Indemnification Representative, if
applicable) (the "Termination Date"), the balance of all Indemnification Escrow
Shares shall be delivered to the Company Shareholders in accordance with Section
3(b)(iv).

<PAGE>


                                       -6-

                  (d)      (i) In the event of a Third Party Claim, the
Indemnifying Party acting through the Indemnification Representative if
applicable, shall have the right, but not the obligation, exercisable by written
notice to the Indemnified Party within 10 days of the date of the Notice of
Claim concerning the commencement or assertion of any Third Party Claim, to
participate in the defense of such Third Party Claim. The Indemnified Party
shall not settle such Third Party Claim without the prior written consent of the
Indemnifying Party, which consent shall not be unreasonably withheld or delayed.
Notwithstanding the foregoing, the Indemnified Party shall have the right to pay
or settle any Third Party Claim at any time, provided that in such event it
waives any right to indemnification therefor by the Indemnifying Party.

                           (ii) Within 10 days of the date a court of competent
jurisdiction or arbitrator shall determine that the Indemnified Party is liable
for all or a portion of the monetary liability arising out of any Third Party
Claim or a settlement is reached, the Indemnifying Party shall be obligated to
deliver to the Indemnified Party cash or, at the option of the Indemnifying
Party, shares of Parent Common Stock, with a value (as determined pursuant to
Section 1 and rounded up to the nearest whole share) equal to such liability or
settlement unless an appeal is made in accordance with the next sentence. If the
Indemnifying Party desires to appeal from an adverse judgment, then the
Indemnifying Party shall post and pay the cost of the security or bond required
to stay execution of the judgment pending appeal. Upon the payment in full by
the Indemnifying Party of such amounts, the Indemnifying Party shall succeed to
the rights of such Indemnified Party, to the extent not waived in settlement,
against the third party who made such Third Party Claim. The Indemnifying Party
and Indemnified Party shall submit disputes regarding any payments due under
this Section 3(d)(ii) to arbitration in accordance with Section 9.

                           (iii) The Indemnifying Party and the Indemnified
Party shall cooperate, in the defense or prosecution of any Third Party Claim
and shall furnish or cause to be furnished such records, information and
testimony, and attend such conferences, discovery proceedings, hearings, trials
or appeals, as may be requested in connection therewith.


         SECTION 5  VOTING RIGHTS AND DISTRIBUTIONS.

                  (a) The Indemnification Escrow Shares, unless and until
delivered to Parent pursuant to this Agreement, shall be registered in the
respective name of the Indemnification Escrow Agent and held on behalf of the
Company Shareholders. The Indemnification Escrow Agent will vote any
Indemnification Escrow Shares held by it for the account of any Company
Shareholder in accordance with any written instructions that are provided by
such Company Shareholder to the Indemnification Escrow Agent. All cash dividends
or distributions of assets declared by Parent with respect to its Common Stock
prior to the Escrow Termination Date, shall be payable to the Company
Shareholders as if each had received all of the shares of Parent Common Stock
deliverable to him at the Effective Time of the Merger and no shares had been
placed into escrow under this Agreement (subject to reduction to reflect the
delivery of

<PAGE>


                                       -7-

Indemnification Escrow Shares to Parent or the Surviving Corporation) under this
Agreement).

                  (b) All shares of Parent Common Stock relating to
Indemnification Escrow Shares still held by the Indemnification Escrow Agent
under this Agreement and resulting from conversion, stock dividend, stock split,
reclassification, recapitalization or corporate reorganization of Parent, shall
be delivered to the Indemnification Escrow Agent when deliverable to holders of
other outstanding shares of Parent Common Stock, shall be credited to the
accounts of the Company Shareholders and shall constitute additional
Indemnification Escrow Shares.


         SECTION 6  THE INDEMNIFICATION REPRESENTATIVE.

                  (a) As long as there are shares held in escrow pursuant to
this Agreement, the Company Shareholders, and each of them, will be represented
by the Indemnification Representative who is empowered to receive any notice
under this Agreement for the Company Shareholders, and each of them, and to give
any and all notices and instructions and take any and all action for and on
behalf of the Company Shareholders, and each of them, under this Agreement. The
Company Shareholders will have the right to remove the Indemnification
Representative and, upon such removal or, in the event of the Indemnification
Representative's death or resignation, to appoint as the new Indemnification
Representative any former Company Shareholder at any time and from time to time
during the period when any shares are held in escrow, by a vote of Company
Shareholders holding a majority interest in the Indemnification Escrow Shares
held in escrow at such time evidenced by a writing executed by such Company
Shareholders. The appointment of a new Indemnification Representative will be of
no force or effect whatsoever upon Parent or the Indemnification Escrow Agent or
otherwise under this Agreement until the Indemnification Escrow Agent receives
actual notice of such appointment, which notice must include at least: (i) the
identity and address of the new Indemnification Representative and a statement
that such Indemnification Representative has been appointed by a vote of Company
Shareholders holding a majority interest in the Indemnification Escrow Shares
and then held in escrow; (ii) the duly acknowledged signatures of each of the
Company Shareholders voting for the new Indemnification Representative; and
(iii) a statement that any non-signing Company Shareholder has been notified in
writing of the appointment of the new Indemnification Representative. Parent and
the Indemnification Escrow Agent will be entitled to rely on any notice received
in such form without conducting an investigation of the contents thereof. Prior
to the Escrow Termination Date, any notice given to the Indemnification
Representative will constitute notice to each and all of the Company
Shareholders at the time notice is given to the Indemnification Representative.
Any action taken by, or notice or instruction received from, the Indemnification
Representative will be deemed to be action by, or notice or instruction from,
each and all of the Company Shareholders. Parent may, and the Indemnification
Escrow Agent will, disregard any notice or instruction received from any Company
Shareholder other than the then acting Indemnification Representative with
regard to this Agreement prior to the Escrow Termination Date.

<PAGE>


                                       -8-

                  (b) The Indemnification Representative shall not suffer any
liability or loss for any act performed or omitted to be performed by him under
this Agreement in the absence of gross negligence, bad faith or willful
misconduct. The Indemnification Representative may consult with counsel in
connection with his duties hereunder and shall be fully protected by any act
taken, suffered, permitted, or omitted in good faith in accordance with the
advice of counsel. The Indemnification Representative shall not be responsible
for the sufficiency or accuracy of the form, execution, validity or genuineness
of documents or securities now or hereafter deposited hereunder, or of any
endorsement thereof or for any lack of endorsement thereon, or for any
description therein, nor shall he be responsible or liable in any respect on
account of the identity, authority or rights of the persons executing or
delivering or purporting to execute or deliver any such document, security or
endorsement, and the Indemnification Representative shall be fully protected in
relying upon any written notice, demand, certificate or document which he in
good faith believes to be genuine.

                  (c) The Indemnification Representative shall be entitled to
employ such legal counsel and other experts as he may deem necessary to advise
him properly with respect to his rights and obligations hereunder and to
evaluate Indemnification Claims and to pursue challenges to Indemnification
Claims or to defend Third Party Claims. The reasonable expenses and fees of such
counsel and experts, and any reasonable, documented out-of-pocket expenses which
the Indemnification Representative incurs under Section 3 or hereunder in
relation to evaluating, challenging or contesting claims, shall be reimbursed by
Parent, provided that any amounts so paid by Parent shall entitle Parent to file
a Notice of Claim with respect to such amounts and collect against the Escrow.

                  (d) The Indemnification Representative hereby agrees to do
such acts, and execute further documents, as shall be necessary to carry out the
provisions of this Agreement or to transfer any Indemnification Escrow Shares
pursuant to the terms hereof.


         SECTION 7   INTEREST IN ESCROW SHARES. The interest of the Company
Shareholders in the Indemnification Escrow Shares (until released to them
hereunder) is nonassignable and shall be transferable only by operation of law.


         SECTION 8   PROVISIONS CONCERNING THE ESCROW AGENT.

                  (a) The Indemnification Escrow Agent shall be entitled to
reasonable compensation for all services rendered and expenses incurred by it in
the performance of its obligations hereunder (on the basis of its regular fees
as set forth on Exhibit A attached hereto). The Indemnification Escrow Agent
shall be entitled to employ such legal counsel and other experts as it may deem
necessary to properly advise it in connection with its obligations hereunder,
and may rely on the advice of such counsel, and may pay them reasonable
compensation therefor. The Indemnification Escrow Agent and such legal counsel's
and other expert's fees and expenses shall be borne by Parent.

<PAGE>


                                       -9-

                  (b) The Indemnification Escrow Agent shall not be liable for
any diminution of value of the Indemnification Escrow Shares. The
Indemnification Escrow Agent shall have no authority to sell or otherwise
dispose of or encumber the Indemnification Escrow Shares except as provided
herein.

                  (c) Notwithstanding any other provisions herein contained, the
Indemnification Escrow Agent may at all times act upon and in accordance with
the joint written instructions of Parent and the Indemnification Representative.
The Indemnification Escrow Agent shall not be liable for any act done or omitted
by it in accordance with such instructions or pursuant to the advice of counsel
of its selection.

                  (d) The duties and responsibilities of the Indemnification
Escrow Agent shall be limited to those expressly set forth in this Agreement and
instructions given to the Indemnification Escrow Agent pursuant to this
Agreement, and the Indemnification Escrow Agent shall not be subject to, nor
obligated to recognize, any other agreement between any or all of the parties
hereto even though reference thereto may be made herein; provided, however, with
the written consent of the Indemnification Escrow Agent, this Agreement may be
amended at any time by an instrument in writing signed by Parent and the
Indemnification Representative. The Indemnification Escrow Agent shall advise
Parent and the Indemnification Representative from time to time, upon request,
as to (i) the number of Indemnification Escrow Shares represented by the
certificate held by the Indemnification Escrow Agent, and (ii) the number of
Indemnification Escrow Shares distributed by the Indemnification Escrow Agent to
the Company Shareholders.

                  (e) The Indemnification Escrow Agent shall not be responsible
for the sufficiency or accuracy of the form, execution, validity or genuineness
of documents or securities now or hereafter deposited hereunder, or of any
endorsement thereof, or for any lack of endorsement thereon, or for any
description therein, nor shall it be responsible or liable in any respect on
account of the identity, authority or rights of the persons executing or
delivering or purporting to execute or deliver any such document, security or
endorsement of this Agreement, and the Indemnification Escrow Agent shall be
fully protected in relying upon any written notice, demand, certificate or
document which it in good faith believes to be genuine.

                  (f) The Indemnification Escrow Agent is authorized, in its
sole discretion, to disregard any and all notices or instructions given by any
of the parties hereto or by any other person, firm or corporation, except such
notices or instructions as are herein provided for in this Agreement and orders
or process of any court entered or issued with or without jurisdiction. If any
property subject hereto is at any time attached, garnished or levied upon under
any court order, or in case the payment, assignment, transfer, conveyance or
delivery of any such property shall be stayed or enjoined by any court order, or
in case any order, judgment or decree shall be made or entered by any court
affecting such property or any part thereof, then and in any of such events, the
Indemnification Escrow Agent is authorized, in its sole discretion, to rely upon
and comply with any such order, writ, judgment or decree which the
Indemnification Escrow

<PAGE>


                                      -10-

Agent is advised by legal counsel of its own choosing is binding upon it; and if
the Indemnification Escrow Agent complies with any such order, writ, judgment or
decree, it shall not be liable to any of the parties hereto or to any other
person, firm or corporation by reason of such compliance even though such order,
writ, judgment or decree may be subsequently reversed, modified, annulled, set
aside or vacated.

                  (g) The Indemnification Escrow Agent may resign by giving
sixty (60) days' advance written notice to Parent and the Indemnification
Representative and thereafter shall deliver the Indemnification Escrow Shares to
such substitute escrow agent as Parent and the Indemnification Representative
shall jointly direct in writing. If such direction to deliver to a substitute
escrow agent is not received by the Indemnification Escrow Agent within sixty
(60) days after mailing such notice of resignation, it is unconditionally and
irrevocably authorized, directed and empowered to file an interplea motion and
deliver all items held by it to a court of competent jurisdiction.

                  (h) In consideration of its acceptance of the appointment as
the Indemnification Escrow Agent, the Parent agrees to indemnify and hold the
Indemnification Escrow Agent harmless as to any liability incurred by it to any
person, firm or corporation by reason of its having accepted the same or in
carrying out any of the terms hereof (except as such liability may arise out of
or be based upon the gross negligence, bad faith or willful misconduct of the
Indemnification Escrow Agent), and to reimburse the Indemnification Escrow Agent
for all its reasonable expenses, including, among other things, counsel fees and
court costs, incurred by reason of its position hereunder or actions taken
pursuant hereto.


         SECTION 9   ARBITRATION. All disputes related to the indemnification
obligations of all or any of the parties hereto under the provisions of this
Agreement shall be submitted to, and settled by, arbitration in Boston,
Massachusetts, in accordance with the Rules of the American Arbitration
Association. The dispute shall be submitted to one arbitrator agreed to by the
Indemnified Party and the Indemnifying Party. If the Indemnified Party and the
Indemnifying Party cannot agree on one arbitrator, one arbitrator will be
selected by each party, with the two selected arbitrators then selecting a third
arbitrator. The fees and expenses of the arbitration or arbitrators shall be
paid by the Indemnifying Party unless the indemnification obligation is reduced
to less than 50% of the amount in the related Notice of Claim and in such event
the fees and expenses shall be paid by the Indemnified Party. Any arbitration
award may be entered in and enforced by any court having jurisdiction thereover
and the parties hereby consent and commit themselves to the jurisdiction of the
courts of the Commonwealth of Massachusetts for the purposes of the enforcement
of any arbitration award.


         SECTION 10   NOTICES. All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be given if delivered in
person, by overnight courier, electronic facsimile or telex (and shall be deemed
to have been duly given on the date of delivery if so given), or by first class
mail (postage prepaid) (and shall be deemed to have been duly given the second
business day after the date of the postmark if so given) to the respective
parties as follows:

<PAGE>


                                      -11-

         If to Parent:

                Excel Switching Corporation
                255 Independence Drive
                Hyannis, MA  02601

                Facsimile:  (508) 862-3160

         If to the Company:

                RAScom, Inc.
                5 Industrial Way
                Salem, NH  03070

                Facsimile:

         If to the Indemnification Representative or any Company Shareholder:
                  Mark Galvin
                  RAScom, Inc.
                  5 Industrial Way
                  Salem, NH 03079
                  Telephone: (603)870-4222
                  Facsimile: (603) 898-4242

         If to the Indemnification Escrow Agent:
                  State Street Bank and Trust Company
                  Two International Place
                  Boston, MA 02110
                  Attn: Corporate Trust Department

or to such other address or facsimile number as any party may have furnished to
the others in writing in accordance herewith, except that notices of changes of
address shall only be effective upon receipt.


         SECTION 11   HEADINGS. The descriptive headings in this Agreement have
been inserted for convenience only and shall not be deemed to limit or otherwise
affect the construction of any provision hereof.


         SECTION 12  ENTIRE AGREEMENT; ASSIGNMENT. This Agreement and the Merger
Agreement constitute the entire agreement among the parties with respect to the
subject matter hereof and thereof and supersede all other prior agreements and
understandings, both written and oral, among the parties or any of them with
respect to the subject matter hereof and thereof. This Agreement shall not be
assigned by operation of law or otherwise.

<PAGE>


                                      -12-

         SECTION 13   PARTIES IN INTEREST. This Agreement shall be binding upon
and inure solely to the benefit of the parties hereto, and nothing in this
Agreement, express or implied, is intended to confer upon any other person any
rights or remedies of any nature whatsoever under or by reason of this
Agreement.


         SECTION 14   VALIDITY. The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provisions of this Agreement, each of which shall remain in full force
and effect, provided that enforcement of such other provisions in the absence of
the invalid or unenforceable provisions does not deprive any party of the
benefit of the bargain.


         SECTION 15  COUNTERPARTS. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original but all of which
shall constitute one and same Agreement.


         SECTION 16   GOVERNING LAW. This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware, regardless of
the laws that might otherwise govern under applicable principles of conflicts of
laws thereof.

<PAGE>

                                      -13-

         IN WITNESS WHEREOF, Parent, Merger Sub, the Company, the
Indemnification Representative, the Indemnification Escrow Agent and each
Company Shareholder have caused this Agreement to be signed by their respective
officers thereunto duly authorized, and their respective seals to be affixed
hereto, as of the date first written above.


                                 EXCEL SWITCHING CORPORATION


                                 By: /s/ Chritopher Stavros
                                     -------------------------------------
                                 Title: Vice President and General Counsel
                                        ----------------------------------



                                 RACEPOINT ACQUISITION CORPORATION

                                 By: Christopher Stavros
                                     -------------------------------------
                                 Title: Vice President
                                        ----------------------------------


                                 RASCOM, INC.

                                 By: /s/ Mark Galvin
                                     -------------------------------------
                                 Title: President
                                        ----------------------------------

                                 /s/ Mark Galvin
                                 -----------------------------------------
                                 Name:  Mark Galvin
                                 as Indemnification Representative



                                 STATE STREET BANK AND TRUST COMPANY
                                 As Indemnification Escrow Agent

                                 By: /s/ Arthur Blakeslee
                                     -------------------------------------
                                 Title: Assistant Vice President
                                        ----------------------------------

                                 /s/ Mark Galvin
                                 -----------------------------------------
                                 Mark Galvin
                                 Address:  69 Indian Ridge Road
                                           East Hempstead, NH  03826

<PAGE>

                                      -14-

                                 /s/ Aaron A. Galvin
                                 /s/ Fryda Galvin
                                 -----------------------------------------
                                 Aaron A. Galvin and Frayda Galvin
                                 Address:  130 Mt. Auburn Street
                                           Cambridge, MA  02138


                                 /s/ Allan M. Kline
                                 -----------------------------------------
                                 Allan M. Kline
                                 Address:  34 Philips Road
                                           Sudbury, MA  01776


                                 /s/ Allen A. Hauf
                                 -----------------------------------------
                                 Allen A. Hauf
                                 Address:  60 Brucewood East
                                           Acton, MA  01720


                                 /s/ Arnold B. Denton
                                 -----------------------------------------
                                 Arnold B. Denton
                                 Address:  36 The Garrison
                                           Dover, NH  03820


                                 /s/ C.W. Dick
                                 -----------------------------------------
                                 C.W. Dick
                                 Address:  19 Thoreau Circle
                                           Beverly, MA  01915


                                 CHARLES RIVER PARTNERSHIP VII
                                 1000 Winter Street, Suite 3300
                                 Waltham, MA 02154


                                 By: /s/ Michael Zak
                                     -------------------------------------
                                 Title: General Partner
                                        ----------------------------------


                                 /s/ Chris Carroll
                                 -----------------------------------------
                                 Chris Carroll
                                 Address:  120 Gray Street
                                           North Andover, MA  01845

<PAGE>


                                      -15-

                                 /s/ Dennis A. Kirshy
                                 -----------------------------------------
                                 Dennis A. Kirshy
                                 Address:  26 Cart Path Road
                                           Weston, MA  02193


                                 /s/ Edward J. Los
                                 -----------------------------------------
                                 Edward J. Los
                                 Address:  7 Cheyenne Drive
                                           Nashua, NH  03063


                                 FIRST ALBANY CORPORATION
                                 CUSTODIAN FBO JAMES C. SCHWALBE IRA
                                 7 Carousel Court
                                 Londonderry, NH  03053


                                 By: /s/ Matthew Hurley
                                     -------------------------------------
                                 Title: Supervisor
                                        ----------------------------------


                                 By: /s/ Scott Perkins
                                     -------------------------------------
                                 Title: Guarantor
                                        ----------------------------------


                                 /s/ Geoffrey Devine
                                 -----------------------------------------
                                 Geoffrey Devine
                                 Address:  P.O. Box 233
                                           Salem, NH  03079


                                 /s/ Gerald A. Friesen
                                 -----------------------------------------
                                 Gerald A. Friesen
                                 Address:  1300 Chinquapin Road
                                           Churchville, PA 18966


                                 /s/ Gilbert M. Kaufman
                                 -----------------------------------------
                                 Gilbert M. Kaufman
                                 Address:  19 Grist Mill Road
                                           Acton, MA  01720

<PAGE>

                                      -16-

                                 HANCOCK VENTURE PARTNERS V-DIRECT FUND L.P.
                                 One Financial Center
                                 Boston, MA  02109

                                 By:  HVP V - Direct Associates L.L.C.
                                 Its: General Partner

                                 By:  Harbour Vest Partners, LLC
                                 Its: Managing Member


                                 By: /s/ Ofer Nemerovsky
                                     -------------------------------------
                                 Title: Managing Director
                                        ----------------------------------


                                 /s/ Harry Newton
                                 -----------------------------------------
                                 Harry Newton
                                 Address:  12 West 21st Street
                                           New York, NY  10010



                                 INTERSTOCK ANSTALT
                                 Herrengasse 21
                                 P.O. Box 339
                                 FL-9490 Vaduz
                                 LICHTENSTEIN

                                 By: /s/ Heimo Quaderer
                                     /s/ Edith Hueppi
                                     -------------------------------------
                                 Title: Directors
                                       -----------------------------------


                                 /s/ James C. Schwalbe
                                 -----------------------------------------
                                 James C. Schwalbe
                                 Address:


                                 /s/ Jeffery S. Basile
                                 -----------------------------------------
                                 Jeffery S. Basile
                                 Address:  24 Southgate Road
                                           Hollis, NH  03049


                                 /s/ Joseph C. Genovese
                                 -----------------------------------------
                                 Joseph C. Genovese
                                 Address:  24 Mill Street
                                           Lincoln, MA  01773

<PAGE>

                                      -17-

                                 /s/ Joseph H. Reilly
                                 -----------------------------------------
                                 Joseph H. Reilly
                                 Address:  41 Pilgrim Street, #201
                                           Cambridge, MA  03087


                                 /s/ Kathryn Barrie
                                 -----------------------------------------
                                 Kathryn Barrie
                                 Address:  277 Harrantis Lake Road
                                           Chester, NH  03036


                                 /s/ Kenneth M. Stess
                                 -----------------------------------------
                                 Kenneth M. Stess
                                 Address:  26 Chandler Drive
                                           Atkinson, NH  03811


                                 /s/ Kevin D. Smith
                                 /s/ Kathryn B. Smith
                                 -----------------------------------------
                                 Kevin D. and Kathryn B. Smith
                                 Address:  15 Varley Drive
                                           Hanata, Ontario K2K 1E7
                                           CANADA


                                 /s/ Kevin Dick
                                 -----------------------------------------
                                 Kevin Dick
                                 Address:  37 Riverdale Avenue
                                           Bradford, MA  01835


                                 /s/ Kimberly A. Ward
                                 -----------------------------------------
                                 Kimberly A. Ward
                                 Address:  6 Harmony Drive
                                           Londonderry, NH  03053

<PAGE>

                                      -18-

                                 LE SERRE
                                 c/o Frank M. Polestra
                                 Ascent Venture Management, Inc.
                                 60 State Street, 19th Floor
                                 Boston, MA  02109


                                 By: /s/ Frank Polestra
                                     -------------------------------------
                                 Title: Partner
                                        ----------------------------------


                                 /s/ Leigh Michl
                                 -----------------------------------------
                                 Leigh Michl
                                 Address: 74 Cherry Brook Road
                                          Weston, MA  02193


                                 /s/ Louis Piazza
                                 -----------------------------------------
                                 Louis Piazza
                                 Address: 11 Carter Lane
                                          Andover, MA  01810


                                 /s/ Marcia Haskel
                                 -----------------------------------------
                                 Marcia Haskel
                                 Address: 8 Ivanhoe Lane
                                          Andover, MA  01810


                                 /s/ Margo Bik
                                 /s/ Nicholas Bik
                                 -----------------------------------------
                                 Margo and Nicholas Bik
                                 Address:  132 Farm Street
                                           Balckstone, MA  01504


                                 /s/ Michael Barza
                                 -----------------------------------------
                                 Michael Barza
                                 Address:  46 Tudor Road
                                           Chestnut Hill, MA  02167


                                 /s/ Michael J. Wood
                                 -----------------------------------------
                                 Michael J. Wood
                                 Address:  11 Lori Road
                                           Derry, NH  03038

<PAGE>

                                      -19-

                                 /s/ Mitchel Sayare
                                 /s/ Susan E. Whitehead
                                 -----------------------------------------
                                 Mitchel Sayare and Susan E. Whitehead
                                 Address:  15 Woodcliff Avenue
                                           Wellesley, MA  02181


                                 /s/ Naresh C. Parmer
                                 -----------------------------------------
                                 Naresh C. Parmer
                                 Address:  36 Adelman Road
                                           Billerica, MA  01821


                                 /s/ Peter Livingstone
                                 -----------------------------------------
                                 Peter Livingstone
                                 Address:  2 Elmwood Avenue, Apt. 35
                                           Winchester, MA  01890


                                 /s/ Peter S. Rood
                                 -----------------------------------------
                                 Peter S. Rood
                                 Address:  6 High Ridge Road
                                           Franklin, MA  02038


                                 /s/ Philip Arrigo
                                 /s/ Frances Arrigo
                                 -----------------------------------------
                                 Philip Arrigo and Frances Arrigo
                                 Address:  74 Governor Dinsmore
                                           Windham, NH  03087


                                 PCC TRANSFER LIMITED
                                 PARTNERSHIP
                                 60 State Street, 19th Floor
                                 Boston, MA 02109


                                 By: /s/ Frank Polestra
                                     -------------------------------------
                                 Title: Manager
                                        ----------------------------------

<PAGE>

                                      -20-

                                 PIONEER VENTURES LIMITED PARTNERSHIP II
                                 60 State Street
                                 Boston, MA  02109

                                 By: /s/ Frank Polestra
                                     -------------------------------------
                                 Title: President
                                        ----------------------------------


                                 /s/ R. Stephen Cheheyl
                                 -----------------------------------------
                                 Stephen R. Cheheyl
                                 Address:  130 Lane's End
                                           Concord, MA  01742


                                 /s/ Reid L. Simpson
                                 -----------------------------------------
                                 Reid L. Simpson
                                 Address:  141 Greenwood Road
                                           Andover, MA  01810


                                 /s/ Robert J. Grochmal
                                 -----------------------------------------
                                 Robert J. Grochmal
                                 Address:  6 Independence Avenue
                                           Derry, NH  03038


                                 /s/ Robert J. Grochmal
                                 /s/ Debra A. Grochmal
                                 -----------------------------------------
                                 Robert J. Grochmal and Debra A.Grochmal, JTWROS
                                 Address:  6 Independence Avenue
                                           Derry, NH  03038

<PAGE>

                                      -21-

                                 /s/ Rodger P. Nordblom
                                 -----------------------------------------
                                 Rodger P. Nordblom
                                 Address:  c/o Nordblom Company
                                           31 Third Avenue
                                           Brighton, MA  01803


                                 /s/ Ron Pullis
                                 -----------------------------------------
                                 Ron Pullis
                                 Address:  42527 S.E. 175th Place
                                           North Bend, WA  98045


                                 /s/ Rubin Gruber
                                 -----------------------------------------
                                 Rubin Gruber
                                 Address:  709 Sudbury Road
                                           Concord, MA  01742


                                 /s/ Stefan Giesler
                                 -----------------------------------------
                                 Stefan Gieseler
                                 Address:  Erbstollen 8A
                                           44797 Bochum
                                           GERMANY


                                 /s/ Steven A. Mulawski
                                 -----------------------------------------
                                 Steven A. Mulawski
                                 Address:  6 Virginia Road
                                           Tyngsboro, MA  01879


                                 SVE STAR VENTURES ENTERPRISES NO. V,
                                 a German Civil Law Partnership
                                 (with Limitation of Liability)
                                 Possart Strasse 9
                                 D-81679 Munich
                                 GERMANY


                                 By: SVM Star Ventures
                                 Managementgesellschaft mbH Nr. 3
                                 Its: Managing Partner

                                 By: /s/ Meir Barel
                                     -------------------------------------
                                 Title: Managing Director
                                        ----------------------------------

<PAGE>

                                      -22-

                                 SVM STAR VENTURES
                                 MANAGEMENTGESELLSCHAFT MBH
                                 Nr. 3 & Co. KG
                                 Possart Strasse 9
                                 D-81679 Munich
                                 GERMANY

                                 By: SVM Star Ventures
                                 Managementgesellschaft mbH Nr. 3
                                 Its: Managing Partner

                                 By: /s/ Meir Barel
                                     -------------------------------------
                                 Title: Managing Partner
                                        ----------------------------------


                                 /s/ Terry R. Young
                                 -----------------------------------------
                                 Terry R. Young
                                 Address:  4 Aiken Street
                                           Derry, NH  03038


                                 THE MHF SYLVAN FUND
                                 63 Sylvan Lane
                                 Weston, MA  02193


                                 By: /s/ Edward Saxe
                                     -------------------------------------
                                 Title: Trustee
                                        ----------------------------------


                                 /s/ Thomas W. Mullaney, Jr.
                                 -----------------------------------------
                                 Thomas W. Mullaney, Jr.
                                 Address:  11 Seaview Drive
                                           Newbury, MA  01951


                                 /s/ Warren J. Maxwell
                                 -----------------------------------------
                                 Warren J. Maxwell
                                 Address:  72 High Road
                                           Newbury, MA  01951

<PAGE>

                                      -23-

                                 WATERLINE CAPITAL, LLC
                                 c/o Alexander M. Levine
                                 790 Boylston Street
                                 Boston, MA  02199

                                 By: /s/ Alexander M. Levine
                                     -------------------------------------
                                 Title: Managing Director
                                        ----------------------------------


                                 /s/ Richard Hannapel
                                 -----------------------------------------
                                 Richard Hannapel
                                 Address:


                                 /s/ Joseph A. Keelan
                                 -----------------------------------------
                                 Joseph A. Keelan
                                 Address:  139 Plain Road
                                           Westford, MA  01886



                                 CASSIE DALTON STESS TRUST
                                 c/o Kenneth Stess

                                 By: /s/ Kenneth Stess
                                     -------------------------------------
                                 Title: Trustee
                                       -----------------------------------


Exhibit A to this Escrow Agreement has not been filed. Exhibit A contains fee
information for services rendered by the Indemnification Escrow Agent. The
Registrant hereby agrees to furnish a copy of Exhibit A if so requested by the
Commission.



                                                                     EXHIBIT 4.2
                                                                     -----------

                              SIDE LETTER AGREEMENT


         Side Letter Agreement dated as of May 10, 1999, by and among Excel
Switching Corporation, a Massachusetts corporation ("Parent"), Racepoint
Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary of
Parent ("Merger Sub"), RAScom, Inc., a Delaware corporation (the "Company"),
State Street Bank and Trust Company (the "Escrow Agent"), and Mark B. Galvin
(the "Indemnification Representative").

         WHEREAS, the parties are entering into a certain Escrow Agreement dated
of even date herewith (the "Escrow Agreement"), and the parties desire to
further clarify the duties of the Escrow Agent under such Escrow Agreement by
supplementing such Escrow Agreement to include the terms provided below;

         NOW, THEREFORE, in consideration of the premises and agreements set
forth below, the parties agree as follows to supplement the Escrow Agreement by
this Side Letter Agreement:

         Section 1. DEPOSIT OF SHARES. Capitalized terms used herein but not
defined shall have the meanings set forth in the Escrow Agreement. On or after
the Effective Date of the Merger, the Parent shall cause to be delivered to the
Escrow Agent the amount of 102,122 shares of Parent Common Stock as set forth on
the attached Schedule I (the "Indemnification Escrowed Shares") in the name of
the Escrow Agent. The Escrow Agent agrees to hold and administer said shares
subject to the terms of this Agreement and the Escrow Agreement. Each Company
Shareholder shall have a percentage interest in said Indemnification Escrow
Shares as set forth on Schedule I hereto (each Company Shareholder's "Percentage
Interest"). The Escrow Agent shall not hold any cash hereunder and shall have no
duty to invest any escrowed property.

         Section 2. ESCROW AGENT'S DUTY. The Escrow Agent shall have no duty to
review or interpret, or monitor compliance with the terms of, the Merger
Agreement or the other documents executed in connection therewith, and may rely
on the use of defined terms in any communication received by it. Any claim for
indemnification thereunder from Indemnification Escrow Shares shall be valued by
dividing such indemnification claim amount by the Per Share Value to arrive at
the correct amount of Indemnification Escrow Shares to be surrendered. Any
surrender of Indemnification Escrow Shares to satisfy a claim hereunder shall be
accomplished by transfer of Parent Common Stock certificates held in escrow by
the Escrow Agent to the Parent's transfer agent ("Transfer Agent") with
instructions to cancel the requisite amount of shares to satisfy such claim, and
to return a stock certificate or certificates to the Escrow Agent for any
remaining Parent Common Stock still in escrow. All disbursements by the Escrow
Agent from the escrow account shall be made in accordance with written
instructions provided by Parent and the Indemnification Representative
(including the allocation of any claims among the Company Shareholders) and the
Escrow Agent may rely conclusively on such written instructions.

         Any disbursements of Indemnification Escrow Shares to Company
Shareholders shall be made by the Transfer Agent based upon written instructions
of the Escrow Agent.


<PAGE>

         Any claim submitted by Parent or the Indemnification Representative to
the Escrow Agent shall contain a certification that the Indemnity Threshold has
been met.

         Any Notice of Claim shall specify if the claim thereunder relates to a
joint and several claim, or a several claim against a particular Company
Shareholder.

         The parties agree that they will give or cause the Indemnification
Escrow Agent to be given written instructions as to any voting of
Indemnification Escrow Shares not less than three (3) business days prior to
such vote, and the Escrow Agent shall otherwise be under no obligation to
preserve, protect or exercise rights in the Indemnification Escrow Shares, and
shall be responsible only for reasonable measures to maintain the physical
safekeeping thereof, and otherwise to perform and observe such duties on its
part as are expressly set forth in this Agreement. The Escrow Agent shall not be
responsible for forwarding to any party, notifying any party with respect to, or
taking any action with respect to, any notice, solicitation or other document or
information, written or otherwise, received from an issuer or other person with
respect to the Indemnification Escrow Shares, including but not limited to,
proxy materials, tender options, the pendency of calls and maturities and
expiration of rights.

         The Escrow Agent shall have no more or less responsibility or liability
on account of any action or omission of any book-entry depository, securities
intermediary or other subescrow agent employed by the Escrow Agent than any such
book-entry depository, securities intermediary or other subescrow agent has to
the Escrow Agent, except to the extent that such action or omission of any
book-entry depository, securities intermediary or other subescrow agent was
caused by the Escrow Agent's own gross negligence, bad faith or willful
misconduct in breach of this Agreement.

         Section 3. NOTICE OF CORPORATE EVENTS. Parent shall give prompt written
notice to the Indemnification Escrow Agent of any corporate event such as a
stock dividend, stock split, reclassification, recapitalization or corporate
reorganization, or any adjustment in the Per Share Value.

         Section 4. TAX INDEMNIFICATION. The Parent shall (i) assume any and all
obligations imposed now or hereafter by any applicable tax law with respect to
any payment or distribution of the Indemnification Escrow Shares or performance
of other activities under the Escrow Agreement, (ii) instruct the Escrow Agent
in writing with respect to the Escrow Agent's responsibility for withholding and
other taxes, assessments or other governmental charges, and to instruct the
Escrow Agent with respect to any certifications and governmental reporting that
may be required under any laws or regulations that may be applicable in
connection with its acting as Escrow Agent under the Escrow Agreement, and (iii)
indemnify and hold the Escrow Agent harmless from any liability or obligation on
account of taxes, assessment, additions for late payment, interest, penalties,
expenses and other governmental charges that may be assessed or asserted against
the Escrow Agent in connection with or relating to any payment made or other
activities performed under the terms of the Escrow Agreement, including without
limitation any liability for the withholding or deduction of (or the failure to
withhold or deduct) the same, and any liability for failure to obtain proper
certifications or to report properly to governmental


<PAGE>

authorities in connection with the Escrow Agreement, including costs and
expenses (including reasonable legal fees and expenses), interest and penalties.
The foregoing indemnification and agreement to hold harmless, and the
indemnification set forth in Section 8(h) of the Escrow Agreement, shall apply
to the officers, directors, employees and agents of the Indemnification Escrow
Agent and shall survive the termination of the Escrow Agreement.

         Section 5. DISPUTE RESOLUTION. It is understood and agreed that (i) the
Escrow Agent's duties under the Indemnification Escrow Agreement are ministerial
and not fiduciary in nature, and (ii) should any dispute arise with respect to
the delivery, ownership, right of possession, and/or disposition of the
Indemnification Escrow Shares, or should the Escrow Agent request or require
additional clarification or instruction, or should any claim be made upon the
Escrow Agent or the Indemnification Escrow Shares by a third party, the Escrow
Agent upon request for clarification or instruction or receipt of notice of such
dispute or claim is authorized and shall be entitled (at its sole option and
election) to retain in its possession without liability to anyone, all or any of
said shares until such dispute shall have been settled either by the mutual
written agreement of the parties involved or by a final order, decree or
judgment of a court in the United States of America, the time for perfection of
an appeal of such order, decree or judgment having expired, or the receipt by
the Escrow Agent of adequate instruction from the Parent and the Indemnification
Representative. The Indemnification Escrow Agent may, but shall be under no duty
whatsoever to, institute or defend any legal proceedings which relate to the
Indemnification Escrow Shares.

         In no event shall the Escrow Agent be liable for indirect, punitive,
special or consequential damage or loss (including but not limited to lost
profits) whatsoever, even if the Escrow Agent has been informed of the
likelihood of such loss or damage and regardless of the form of action.

         This Side Letter Agreement and the Escrow Agreement may not be altered
or modified without the express written consent of the parties hereto. No course
of conduct shall constitute a waiver of any of the terms and conditions of this
Side Letter Agreement or the Escrow Agreement, unless such waiver is specified
in writing, and then only to the extent so specified. A waiver of any of the
terms and conditions of the Escrow Agreement or this Side Letter Agreement on
one occasion shall not constitute a waiver of the other terms of the Escrow
Agreement or this Side Letter Agreement, or of such terms and conditions on any
other occasion.

         Section 6. CONSENT TO JURISDICTION AND SERVICE. Each of the Parent and
the Indemnification Representative hereby absolutely and irrevocably consent and
submit to the jurisdiction of the courts in the Commonwealth of Massachusetts
and of any Federal court located in said Commonwealth in connection with any
actions or proceedings brought against any of the parties (or each of them) by
the Indemnification Escrow Agent arising out of or relating to the Escrow
Agreement. In any such action or proceedings, the parties each hereto absolutely
and irrevocably (i) waives any objection to jurisdiction or venue, (ii) waives
personal services of any summons, complaint, declaration or other process, and
(iii) agrees that the service thereof may be made by certified or registered
first-class mail directed to such party, as the case may be, at their respective
addresses set forth in the Escrow Agreement


<PAGE>

         Section 7. FORCE MAJEURE. The Indemnification Escrow Agent shall not be
responsible for delays or failures in performance resulting from acts beyond its
control. Such acts shall include but not be limited to acts of God, strikes,
lockouts, riots, acts of war, epidemics, governmental regulations superimposed
after the fact, fire, communication line failures, computer viruses, power
failures, earthquakes or other disasters.




<PAGE>


         IN WITNESS WHEREOF, Parent, Merger Sub, the Company, the
Indemnification Representative, the Indemnification Escrow Agent have caused
this Side Letter Agreement to be signed by their respective officers thereunto
duly authorized, and their respective seals to be affixed hereto as an
instrument under seal governed by the laws of the Commonwealth of Massachusetts,
as of the date first written above.


EXCEL SWITCHING CORPORATION


By:  /s/ Christopher Stavros
     -------------------------------------
Title:  Vice President and General Counsel
        ----------------------------------

RACEPOINT ACQUISITION CORPORATION

By: /s/ Christopher Stavros
    --------------------------------------
Title:  Vice President
        ----------------------------------

RASCOM, INC.

By:  /s/ Mark Galvin
     -------------------------------------
Title:  President
        ----------------------------------

/s/ Mark Galvin
- ------------------------------------------
Name:  Mark Galvin
as Indemnification Representative


STATE STREET BANK AND TRUST COMPANY
As Escrow Agent

By:  /s/ Arthur Blakeslee
     -------------------------------------
Title:  Assistant Vice President
        ----------------------------------


<PAGE>


                       EXHIBIT I -- SHARES TO BE ESCROWED

- --------------------------------------------------- -------------- -------------
                                                     EXCEL SHARES    PERCENTAGE
NAME OF SHAREHOLDER                                 TO BE ESCROWED  INTEREST (%)
- --------------------------------------------------- -------------- -------------
Arrigo, Philip                                                 13          .013
- --------------------------------------------------- -------------- -------------
Barrie, Kathy                                                   1          .001
- --------------------------------------------------- -------------- -------------
Barza, Michael                                                768          .752
- --------------------------------------------------- -------------- -------------
Basile, Jeffrey S.                                            348          .341
- --------------------------------------------------- -------------- -------------
Bik, Margo & Nicholas                                         287          .281
- --------------------------------------------------- -------------- -------------
C.W. Dick                                                     181          .177
- --------------------------------------------------- -------------- -------------
Carroll, Chris                                                 19          .019
- --------------------------------------------------- -------------- -------------
Cassie Dalton Stess Trust                                      45          .044
- --------------------------------------------------- -------------- -------------
Charles River Partnership VII                              18,088        17.712
- --------------------------------------------------- -------------- -------------
Cheheyl, R. Stephen                                           274          .268
- --------------------------------------------------- -------------- -------------
Denton, Arnold                                                  6          .006
- --------------------------------------------------- -------------- -------------
Devine, Geoffrey                                              266          .260
- --------------------------------------------------- -------------- -------------
Dick, Kevin                                                    26          .025
- --------------------------------------------------- -------------- -------------
First Albany Custodian FBO J.C. Schwalbe IRA                   87          .085
- --------------------------------------------------- -------------- -------------
Friesen, Gerald A.                                            497          .487
- --------------------------------------------------- -------------- -------------
Galvin, Aaron & Frayda                                      1,606         1.573
- --------------------------------------------------- -------------- -------------
Galvin, Mark B.                                            17,751        17.382
- --------------------------------------------------- -------------- -------------
Genovese, Joseph C.                                           432          .423
- --------------------------------------------------- -------------- -------------
Gieseler, Stefan                                              211          .207
- --------------------------------------------------- -------------- -------------
Grochmal, Robert                                               45          .044
- --------------------------------------------------- -------------- -------------
Grochmal, Robert and Debra JTWROS                              67          .066
- --------------------------------------------------- -------------- -------------
Gruber, Rubin                                                 452          .443
- --------------------------------------------------- -------------- -------------
Harbour Vest Partners V - Direct Fund L.P.                 21,663        21.213
- --------------------------------------------------- -------------- -------------
Hannappel, Richard                                              6          .006
- --------------------------------------------------- -------------- -------------
Haskell, Marcia                                                22          .022
- --------------------------------------------------- -------------- -------------
Hauf, Allen A.                                                612          .599
- --------------------------------------------------- -------------- -------------
Interstock Anstalt                                            343          .336
- --------------------------------------------------- -------------- -------------
Kaufman, Gilbert                                              296          .290
- --------------------------------------------------- -------------- -------------
Keelan, Joseph                                                  7          .007
- --------------------------------------------------- -------------- -------------
Kirshy, Dennis A.                                             682          .668
- --------------------------------------------------- -------------- -------------
Kline, Allan M.                                               327          .320
- --------------------------------------------------- -------------- -------------
Le Serre                                                      362          .354
- --------------------------------------------------- -------------- -------------
Livingstone, Peter                                             39          .038
- --------------------------------------------------- -------------- -------------
Los, Edward                                                    33          .032
- --------------------------------------------------- -------------- -------------
Maxwell, Warren                                                25          .024
- --------------------------------------------------- -------------- -------------
Michl, Leigh                                                   34          .033
- --------------------------------------------------- -------------- -------------
Mulawski, Steve                                               174          .170
- --------------------------------------------------- -------------- -------------
Mullaney, Thomas                                               48          .047
- --------------------------------------------------- -------------- -------------
Newton, Harry                                                 497          .487
- --------------------------------------------------- -------------- -------------



<PAGE>

- --------------------------------------------------- -------------- -------------
                                                     EXCEL SHARES    PERCENTAGE
NAME OF SHAREHOLDER                                 TO BE ESCROWED  INTEREST (%)
- --------------------------------------------------- -------------- -------------
Nordblom, Rodger P.                                         1,529         1.497
- --------------------------------------------------- -------------- -------------
Parmar, Naresh                                                 53          .052
- --------------------------------------------------- -------------- -------------
PCC Transfer Limited Partnership                            7,235         7.085
- --------------------------------------------------- -------------- -------------
Piazza, Louis                                                 100          .098
- --------------------------------------------------- -------------- -------------
Pioneer Ventures Limited Partnership II                    10,853        10.627
- --------------------------------------------------- -------------- -------------
Pullis, Ronald                                                 45          .044
- --------------------------------------------------- -------------- -------------
Reilly, Joseph                                                 13          .012
- --------------------------------------------------- -------------- -------------
Rood, Peter                                                    90          .088
- --------------------------------------------------- -------------- -------------
Sayare, Mitchell & Whitehead, Susan                           508          .497
- --------------------------------------------------- -------------- -------------
Schwalbe, James                                               178          .174
- --------------------------------------------------- -------------- -------------
Simpson, Reid                                                  41          .040
- --------------------------------------------------- -------------- -------------
Smith, Kevin B. & Kathryn D.                                  543          .532
- --------------------------------------------------- -------------- -------------
Stess, Kenneth M.                                              34          .033
- --------------------------------------------------- -------------- -------------
SVE Star Ventures Enterprises No. V                         8,387         8.213
- --------------------------------------------------- -------------- -------------
SVM Star Ventures Management gmbH Nr. 3 & Co. KG            1,890         1.851
- --------------------------------------------------- -------------- -------------
The MHF Sylvan Fund                                         1,637         1.603
- --------------------------------------------------- -------------- -------------
Ward, Kim                                                       3          .003
- --------------------------------------------------- -------------- -------------
Waterline Capital, LLC                                      2,261         2.214
- --------------------------------------------------- -------------- -------------
Wood, Michael                                                  53          .052
- --------------------------------------------------- -------------- -------------
Young, Terry                                                   29          .028
- --------------------------------------------------- -------------- -------------
                                TOTAL                     102,122        99.998
- --------------------------------------------------- -------------- -------------



                                                                     EXHIBIT 4.3
                                                                     -----------

                          REGISTRATION RIGHTS AGREEMENT

                                                              May 10, 1999

Dear Sir/Madam:

         Pursuant to the Agreement and Plan of Merger Reorganization dated as of
April 15, 1999 (the "MERGER AGREEMENT"), among Excel Switching Corporation (the
"COMPANY"), Racepoint Acquisition Corporation, a subsidiary of the Company
("MERGER SUB"),RAScom, Inc. ("TARGET") and the other parties named herein,
Merger Sub is being merged with and into Target. In connection therewith, as one
of the holders (the "HOLDERS") of Common Stock of Target, you are acquiring
shares of Common Stock of the Company. As context requires, a Holder may be
referred to as a "SELLER". In connection with the transaction, the Company and
you covenant and agree as follows:

         1. CERTAIN DEFINITIONS. As used in this Agreement, the following terms
shall have the following respective meanings:

         "COMMISSION" shall mean the Securities and Exchange Commission, or any
      other federal agency at the time administering the Securities Act.

         "COMMON SHARES" shall mean the shares of Common Stock of the Company
      issued to the Holders pursuant to the Merger Agreement.

         "COMMON STOCK" shall mean the Common Stock, $.01 par value, of the
      Company, as constituted as of the date of this Agreement.

         "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
      amended, or any similar federal statute, and the rules and regulations of
      the Commission thereunder, all as the same shall be in effect at the time.

         "REGISTRATION EXPENSES" shall mean the expenses so described in Section
      8.

         "RESTRICTED STOCK" shall mean the Common Shares, excluding Common
      Shares which have been (a) registered under the Securities Act pursuant to
      an effective registration statement filed thereunder and disposed of in
      accordance with the registration statement covering them, (b) sold
      pursuant to Rule 144 under the Securities Act or (c) transferred in a
      transaction in which the seller's rights and obligations under this
      Agreement were not assigned in accordance with this Agreement.

         "SECURITIES ACT" shall mean the Securities Act of 1933, as amended, or
      any similar federal statute, and the rules and regulations of the
      Commission thereunder, all as the same shall be in effect at the time.

         "SELLING EXPENSES" shall mean the expenses so described in Section 8.


<PAGE>

         2. COMPLIANCE WITH SECURITIES LAWS. You represent and warrant that:

                  (a) You are acquiring the Common Shares to be issued to you
solely in exchange for the shares of capital stock of Target owned by you or
otherwise issuable to you by Target in connection with the transactions
contemplated by the Merger Agreement.

                  (b) You have paid no brokerage or similar commissions in
connection with the acquisition of such Common Shares.

                  (c) You are acquiring such Common Shares solely for your
account.

                  (d) You have provided such information as may reasonably have
been requested by the Company in order for the Company or its counsel to
evaluate the availability of an exemption under the Securities Act for the
issuance of Company Stock to you.

                  (e) Subject to applicable community property laws, you are the
lawful owner of the shares of Target Common Stock to be exchanged for shares of
the Company's Common Stock pursuant to the Merger Agreement and have good and
clear title to such shares, free of all restrictions on transfer, liens,
encumbrances, security interests and claims whatsoever.

         3. SECURITIES ACT MATTERS. You acknowledge and agree that the Common
Shares to be issued to you have not been (and at the time of acquisition by you,
will not have been) registered under the Securities Act or under the securities
laws of any state, in reliance upon certain exemptive provisions of such
statutes. You recognize and acknowledge that such claims of exemption are based,
in part, upon your representations contained in this Agreement. You further
recognize and acknowledge that, because the Common Shares are unregistered under
federal and state laws, they are not presently eligible for public resale, and
may only be resold in the future pursuant to an effective registration statement
under the Securities Act and any applicable state securities laws, or pursuant
to a valid exemption from such registration requirements. You recognize and
acknowledge that Rule 144 promulgated under the Securities Act (which
facilitates routine sales of securities in accordance with the terms and
conditions of that Rule, including a holding period requirement) is not now
available to you for resale of the Common Shares, and you recognize and
acknowledge that, in the absence of the availability of Rule 144, a sale
pursuant to a claim of exemption from registration under the Securities Act
would require compliance with some other exemption under the Securities Act,
none of which may be available for resale of the Common Shares by you. You
recognize and acknowledge that, except as set forth in this Agreement, the
Company is under no obligation to register the Common Shares, either pursuant to
the Securities Act or the securities laws of any state.

         4. RESTRICTIVE LEGEND. Each certificate representing Common Shares
shall, except as otherwise provided in this Section 4 or in Section 5, be
stamped or otherwise imprinted with a legend substantially in the following
form:

              "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
              1933 AND MAY NOT BE TRANSFERRED OR


<PAGE>

              OTHERWISE DISPOSED OF UNLESS IT HAS BEEN REGISTERED UNDER THAT ACT
              OR AN EXEMPTION FROM REGISTRATION IS AVAILABLE. THE HOLDER OF THIS
              SECURITY IS ENTITLED TO CERTAIN REGISTRATION RIGHTS SET FORTH IN A
              REGISTRATION RIGHTS AGREEMENT DATED MAY 10, 1999, A COPY OF WHICH
              MAY BE OBTAINED FROM THE CLERK OF THE CORPORATION."

Such certificates shall not bear the above legend if in the opinion of counsel
satisfactory to the Company the securities being sold thereby may be publicly
sold without registration under the Securities Act or if such securities have
been sold pursuant to Rule 144 or an effective registration statement.

         5. NOTICE OF PROPOSED TRANSFER. Prior to any proposed transfer of any
Common Shares, the holder thereof shall give written notice to the Company of
its intention to effect such transfer. Each such notice shall describe the
manner of the proposed transfer and, if requested by the Company, shall be
accompanied by an opinion of counsel satisfactory to the Company to the effect
that the proposed transfer may be effected without registration under the
Securities Act, whereupon the holder of such security shall be entitled to
transfer such security in accordance with the terms of its notice; provided,
however, that no prior notice or opinion of counsel shall be required if the
sale is made in compliance with Rule 144 or if such transfer is to one or more
partners of the transferor (in the case of a transferor that is a partnership).
Each certificate for Common Shares transferred as above provided shall bear the
legend set forth in Section 4, except that such certificate shall not bear such
legend if (i) such transfer is in accordance with the provisions of Rule 144 (or
any other rule permitting public sale without registration under the Securities
Act) or (ii) the opinion of counsel referred to above is to the further effect
that the transferee and any subsequent transferee (other than an affiliate of
the Company) would be entitled to transfer such securities in a public sale
without registration under the Securities Act. The restrictions provided for in
this Section 5 shall not apply to securities which are not required to bear the
legend prescribed by Section 4 in accordance with the provisions of that
Section.

         6. REGISTRATION.

                  (a) Shelf Registration. (i) The Company agrees to cause a
registration statement under the Securities Act on Form S-3 relating to up to
fifty percent (50%) of the shares of Common Stock issued to each Holder pursuant
to the Merger Agreement to be filed within sixty (60) days after the Closing
Date (as defined in the Merger Agreement) and shall use all commercially
reasonable efforts to cause such registration statement to be declared effective
by the Commission on, or as expeditiously as possible after, the publication by
the Company of financial results including at least thirty (30) days
post-Closing combined results of operations of the Company and Target, subject
to and in accordance with Section 7 hereof.

                  (ii) The Company agrees to cause a registration statement
under the Securities Act on Form S-3 relating to the remaining fifty percent
(50%) of the shares of Common Stock issued to each Holder pursuant to the Merger
Agreement to be filed within one year after the Closing Date, and shall use all
commercially reasonable efforts to cause such registration statement to be


<PAGE>

declared effective by the Commission as expeditiously as possible, and to
maintain the effectiveness of such registration statement for at least nine
months thereafter.

                  (b) Piggyback Registration Rights. On one occasion between the
first and second anniversary of the Closing Date, each holder of Restricted
Stock shall have the right to have his, her or its shares of Restricted Stock
included for sale on any registration statement filed by the Company, except
registration statements filed on Form S-4 and Form S-8 or their successor forms
or any other form which does not permit registration of the Restricted Stock, at
the Company's cost and expense (except commissions or discounts and fees of the
holder's own professionals, if any); provided, however, that this provision
shall not apply to any shares of Restricted Stock that may, at the time of
filing of such Company registration statement, be sold within any three-month
period under Rule 144 of the Act. If the offering with respect to which a
registration statement is filed is managed by an independent underwriter, and if
in the reasonable judgment of the managing underwriter, the sale of shares of
Restricted Stock in connection with the proposed offering would have a material
adverse effect on the offering, then the number of shares of Restricted Stock to
be sold by stockholders of the Company may be reduced and cut back, pro rata
with other Holders who propose to sell shares in the offering; provided,
however, that management of the Company shall have priority in the event of any
cut-back. The Company shall give the Holder ten (10) business days notice of the
intended filing date of any registration statement, other than a registration
statement filed on Form S-4 or Form S-8 or any successor form, and the Holder
shall have one week after receipt of such notice to notify the Company of its
intent to include any shares of Restricted Stock in such registration statement.

         7. REGISTRATION PROCEDURES. In using its efforts to effect the
registration of any shares of Restricted Stock under the Securities Act as
described in Section 6, the Company will, as expeditiously as possible:

                  (a) prepare and file with the Commission a registration
statement on Form S-3 with respect to such securities as specified in Section 6
above and use its commercially reasonable efforts to cause such registration
statement to become effective as soon as reasonably practicable thereafter and
to remain effective until the earlier of the sale of all Restricted Stock
covered thereby or one year after the Closing Date, provided, however, that the
Company may delay the filing or effectiveness of such registration statement or
suspend sales at any time under the registration statement immediately upon
notice to the undersigned at the last known address of the undersigned, for a
period or periods of time not to exceed in the aggregate 90 days during any
12-month period, if there then exists material, non-public information relating
to the Company which, in the reasonable opinion of the Company, would not be
appropriate for disclosure during that time. Moreover, anything herein to the
contrary notwithstanding, the Company shall not be required to take any action
to cause the registration statement to be declared effective by the Commission
at any time prior to the publication by the Company of financial results
including at least thirty (30) days' post-Closing combined results of operations
of the Company and Target;

                  (b) prepare and file with the Commission such amendments and
supplements to such registration statement and the prospectus used in connection
therewith as may be


<PAGE>

necessary to keep such registration statement effective until the earlier of the
sale of all Restricted Stock covered thereby or the first anniversary of the
Closing Date;

                  (c) furnish to each seller of Restricted Stock such number of
copies of the registration statement and each such amendment and supplement
thereto (in each case including exhibits) and the prospectus included therein
(including each preliminary prospectus) as such persons reasonably may request
in order to facilitate the public sale or other disposition of the Restricted
Stock covered by such registration statement;

                  (d) use its commercially reasonable efforts to register or
qualify the Restricted Stock covered by such registration statement under the
securities or "blue sky" laws of such jurisdictions as the sellers of Restricted
Stock reasonably shall request, provided, however, that the Company shall not
for any such purpose be required to qualify generally to transact business as a
foreign corporation in any jurisdiction where it is not so qualified or to
consent to general service of process in any such jurisdiction;

                  (e) use its commercially reasonable efforts to have the
Restricted Stock covered by such registration statement approved for listing and
subject to quotation on the Nasdaq National Market;

                  (f) notify each seller of Restricted Stock under such
registration statement (at any time when a prospectus relating thereto is
required to be delivered under the Securities Act), of the happening of any
event of which the Company has knowledge as a result of which the prospectus
contained in such registration statement, as then in effect, includes an untrue
statement of a material fact or omits to state a material fact required to be
stated therein or necessary to make the statements therein not misleading in
light of the circumstances then existing, and promptly prepare and furnish to
such seller a reasonable number of copies of a prospectus supplemented or
amended so that, as thereafter delivered to the purchasers of such Restricted
Stock, such prospectus shall not include an untrue statement of material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein not misleading in light of the circumstances then
existing; and

                  (g) furnish, at the request of any Holder requesting
registration of Restricted Stock, on the date that such Restricted Stock is
delivered to the underwriters for sale in connection with a registration
pursuant to this Agreement if such securities are being sold through
underwriters, (i) an opinion, dated such date, of the counsel representing the
Company for the purposes of such registration, in form and substance as is
customarily given to underwriters in an underwritten public offering, addressed
to the underwriters, if any, and (ii) a letter dated such date, from the
independent certified public accountants of the Company, in form and substance
as is customarily given by independent certified public accountants to
underwriters in an underwritten public offering, addressed to the underwriters,
if any.

         If the Company shall determine in its discretion that it is in the best
interest of the Company to effect distribution by means of an underwriting, the
Company shall promptly notify each seller of such determination. In such event,
the right of any seller to participate in such distribution shall be conditioned
upon such seller's agreement to enter into a written agreement


<PAGE>

with the managing underwriter in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

         8. EXPENSES. All expenses incurred by the Company in complying with
Sections 6 and 7, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses incurred in connection
with complying with state securities or "blue sky" laws, fees of the National
Association of Securities Dealers, Inc., transfer taxes, fees of transfer agents
and registrars, and costs of issuance, but excluding any Selling Expenses, are
called "REGISTRATION EXPENSES". All fees and expenses of counsel to the sellers,
underwriting discounts (if any) and selling commissions applicable to the sale
of Restricted Stock are called "SELLING EXPENSES".

         The Company will pay all Registration Expenses in connection with a
registration statement on Form S-3 under Section 6. All Selling Expenses in
connection with any registration statement under Section 6 shall be borne by the
participating sellers in proportion to the number of shares sold by each and
each seller shall be responsible for the fees and expenses of his, her or its
own counsel. The Company shall not be obligated to pay any Registration Expenses
in connection with the registration statement under Section 6 if such
registration statement is withdrawn, delayed or abandoned for any reason by the
sellers.

         9. INDEMNIFICATION AND CONTRIBUTION.

                  (a) In connection with the registration of the Restricted
Stock under the Securities Act pursuant to Section 6, the Company will indemnify
and hold harmless each seller of such Restricted Stock thereunder, its officers
and directors, each underwriter of such Restricted Stock thereunder and each
other person, if any, who controls such seller or underwriter within the meaning
of the Securities Act, against any losses, claims, damages or liabilities, joint
or several, to which such seller, officer, director, underwriter or controlling
person may become subject under the Securities Act, Exchange Act, state
securities laws or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon (i)
any untrue statement or alleged untrue statement of material fact contained in
the registration statement under which such Restricted Stock was registered
under the Securities Act pursuant to Section 6, any preliminary prospectus or
final prospectus contained therein, or any amendment or supplement thereto, (ii)
the omission or alleged omission of a material fact required to be stated
therein or necessary to make the statements therein not misleading or (iii) any
violation by the Company or its agents of any rule or regulation promulgated
under the Securities Act, Exchange Act or state securities laws applicable to
the Company or its agents and relating to action or inaction required of the
Company in connection with such registration, and the Company will reimburse
each such seller, each such officer and director, each such underwriter and each
such controlling person for any legal or other expenses reasonably incurred by
them in connection with investigating or defending any such loss, claim, damage,
liability or action, provided, however, that the Company will not be liable in
any such case to the extent that any such loss, claim, damage or liability
arises out of or is based upon an untrue statement or alleged untrue statement
or omission or alleged omission so made in reliance


<PAGE>

upon and in conformity with information furnished by any such seller in writing,
any such underwriter or any such controlling person.

                  (b) In connection with the registration of the Restricted
Stock under the Securities Act pursuant to Section 6, each seller of such
Restricted Stock thereunder, severally and not jointly, will indemnify and hold
harmless the Company, each person, if any, who controls the Company within the
meaning of the Securities Act, each officer of the Company who signs the
registration statement, each director of the Company, each underwriter and each
person who controls any underwriter within the meaning of the Securities Act,
against all losses, claims, damages or liabilities, joint or several, to which
the Company or such officer, director, underwriter or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or
are based upon (i) the failure of such seller to comply with the provisions of
Section 12 herein or (ii) any untrue statement or alleged untrue statement of
any material fact contained in the registration statement, any preliminary
prospectus or final prospectus contained therein, or any amendment or supplement
thereto, or arise out of or are based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading, and will reimburse the Company and each
such officer, director, underwriter and controlling person for any legal or
other expenses reasonably incurred by them in connection with investigating or
defending any such loss, claim, damage, liability or action, provided, however,
that such seller will be liable hereunder in any such case if and only to the
extent that any such loss, claim, damage or liability arises out of or is based
upon an untrue statement or alleged untrue statement or omission or alleged
omission made in reliance upon and in conformity with information pertaining to
such seller, and furnished in writing by or on behalf of such seller.

                  (c) Promptly after receipt by an indemnified party hereunder
of notice of the commencement of any action, such indemnified party shall, if a
claim in respect thereof is to be made against the indemnifying party hereunder,
notify the indemnifying party in writing thereof, but the omission so to notify
the indemnifying party shall not relieve it from any liability which it may have
to such indemnified party other than under this Section 9 and shall only relieve
it from any liability which it may have to such indemnified party under this
Section 9 if and to the extent the indemnifying party is prejudiced by such
omission. In case any such action shall be brought against any indemnified party
and it shall notify the indemnifying party of the commencement thereof, the
indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof and the approval by the indemnified party of the counsel chosen
by the indemnifying party, the indemnifying party shall not be liable to such
indemnified party under this Section 9 for any legal expenses subsequently
incurred by such indemnified party in connection with the defense thereof other
than reasonable costs of investigation and of liaison with counsel so selected,
provided, however, that, if the defendants in any such action include both the
indemnified party and the indemnifying party and if the interests of the
indemnified party reasonably may be deemed to conflict with the interests of the
indemnifying party, the indemnified party shall have the right to select a
separate counsel and to assume such legal defenses and otherwise to participate
in the defense of such action, with the


<PAGE>

expenses and fees of such separate counsel and other expenses related to such
participation to be reimbursed by the indemnifying party as incurred.

                  (d) In order to provide for just and equitable contribution to
joint liability in any case in which either (i) any holder of Restricted Stock
exercising rights under this Agreement, or any controlling person of any such
holder, makes a claim for indemnification pursuant to this Section 9 but it is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that this Section 9 provides for indemnification in
such case, or (ii) contribution under the Securities Act may be required on the
part of any such selling holder or any such controlling person in circumstances
for which indemnification is provided under this Section 9; then, and in each
such case, the Company and such holder will contribute to the aggregate losses,
claims, damages or liabilities to which they may be subject (after contribution
from others) in proportion to the relative fault of the Company, on the one
hand, and each holder, severally, on the other hand; provided, however, that, in
any such case, no person or entity guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Securities Act) will be entitled to
contribution from any person or entity who was not guilty of such fraudulent
misrepresentation, and further provided, that in no event shall the liability of
such holder for contribution hereunder exceed the amount for which such holder
would have been liable if Section 9(b) above were determined to be enforceable.

                  (e) The indemnities provided in this Section 10 shall survive
the transfer of any Restricted Stock by such holder.

         10. REPORTS UNDER SECURITIES EXCHANGE ACT OF 1934. With a view to
making available to the Holders the benefits of Rule 144 promulgated under the
Securities Act and any other rule or regulation thereunder that may at any time
permit a Holder to sell securities of the Company to the public without
registration, the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144;

                  (b) maintain registration of its Common Stock under Section 12
of the Exchange Act;

                  (c) file in a timely manner all reports and other documents
required of the Company under the Securities Act and the Exchange Act; and

                  (d) furnish to any Holder, so long as the Holder owns any
Restricted Securities, forthwith upon request: (i) a written statement by the
Company that it has complied with the reporting requirements of Rule 144, (ii) a
copy of the most recent annual or quarterly report of the Company and such other
reports and documents so filed by the Company; and (iii) such other information
as may be reasonably requested in availing any Holder of any rule or regulation
under the Securities Act which permits the selling of any such securities
without registration or pursuant to such form.


<PAGE>

         11. CHANGES IN COMMON STOCK. If, and as often as, there is any change
in the Common Stock by way of a stock split, stock dividend, combination or
reclassification, or through a merger, consolidation, reorganization or
recapitalization, or by any other means, appropriate adjustment shall be made in
the provisions hereof so that the rights and privileges granted hereby shall
continue with respect to the Common Stock as so changed.

         12. SELLERS' CONDUCT. With respect to any sale of Common Shares
pursuant to Section 6, you understand and agree as follows:

                  (a) You will carefully review the information concerning you
contained in the registration statement (if any) and will promptly notify the
Company if such information is not complete and accurate in all respects,
including having properly disclosed any position, office or other material
relationship within the past three years with the Company, Target or their
affiliates;

                  (b) You agree to sell your Common Shares only in the manner
set forth in the registration statement and agree to comply with the
anti-manipulation rules under the Exchange Act in connection with purchases and
sales of securities of the Company during the time the registration statement
remains effective

                  (c) You agree to comply with the prospectus delivery
requirements of the Exchange Act;

                  (d) You agree to promptly notify the Company of any and all
planned sales and completed sales of shares; and

                  (e) You agree to suspend sales during the periods when sales
are required to be suspended pursuant to Section 7(a) herein.

                  (f) In connection with each registration hereunder, you agree
to furnish to the Company in writing such information requested by the Company
with respect to yourself and the proposed distribution by you as shall be
necessary in order to assure compliance with federal and applicable state
securities laws.

         13.      MISCELLANEOUS.

                  (a) 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 (including
without limitation transferees of any Restricted Stock, provided, that such
transferee executes a counterpart signature page to this Agreement), whether so
expressed or not.

                  (b) All notices, requests, consents and other communications
hereunder shall be in writing and shall be delivered by first class mail,
postage prepaid, by overnight courier or by electronic facsimile or telex and
addressed as follows:


<PAGE>

                  If to the Company, at:

                  Excel Switching Corporation
                  255 Independence Drive
                  Hyannis, MA  02601

                  Attn: Christopher Stavros
                        General Counsel

                  If to any other party hereto, at the address of such party set
              forth on the signature page hereto;

                  If to any subsequent holder of Restricted Stock, to it at such
              address as may have been furnished to the Company in writing by
              such holder;

or, in any case, at such other address or addresses as shall have been furnished
in writing to the Company (in the case of a holder of Restricted Stock) or to
the holders of Restricted Stock (in the case of the Company) in accordance with
the provisions of this paragraph.

                  (c) This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware.

                  (d) This Agreement may be amended or modified, and provisions
hereof may be waived, with the written consent of the Company and the Holders of
at least a majority of the shares of Restricted Stock outstanding at the time of
such amendment, modification or waiver.

                  (e) This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                  (f) If any provision of this Agreement shall be held to be
illegal, invalid or unenforceable, such illegality, invalidity or
unenforceability shall attach only to such provision and shall not in any manner
affect or render illegal, invalid or unenforceable any other provision of this
Agreement, and this Agreement shall be carried out as if any such illegal,
invalid or unenforceable provision were not contained herein.

                  (g) Without the prior written consent of the Company, the
registration rights set forth in this Agreement are not transferable except to a
trust or other estate planning entity created for the benefit of any seller or
their immediate family members. Such consent may be granted or denied at the
Company's sole discretion. All transferees must agree in writing to be bound by
all the provisions of this Agreement.


<PAGE>

         14. REPRESENTATIONS AND COVENANTS. You hereby represent and warrant to
the Company as follows:

                  (a) YOU UNDERSTAND THAT YOUR INVESTMENT IN THE SECURITIES
INVOLVES RISK.

                  (b) YOU HAVE CONSULTED YOUR OWN ATTORNEY, ACCOUNTANT OR
INVESTMENT ADVISOR WITH RESPECT TO THE INVESTMENT CONTEMPLATED HEREBY AND ITS
SUITABILITY FOR YOU. ANY SPECIFIC ACKNOWLEDGMENT SET FORTH BELOW WITH RESPECT TO
ANY STATEMENT OR INFORMATION FURNISHED TO YOU SHALL NOT BE DEEMED TO LIMIT THE
GENERALITY OF THIS REPRESENTATION AND WARRANTY.

                  (c) The Company has made available to you, during the course
of this transaction and prior to the acquisition of the Company Common Stock
(collectively, and hereinafter referred to as, the "SECURITIES"), the
opportunity to ask questions of and receive complete and correct answers from
representatives of the Company concerning the terms and conditions of the
Securities and to obtain any additional information relating to the financial
condition and business of the Company.

                  (d) You understand that you must bear the economic risk of
this investment until such time as the Securities are registered; that the
Securities are not currently registered under the Securities Act, and,
therefore, cannot be resold unless they are subsequently registered under the
Securities Act or unless an exemption from such registration is available; that
you are purchasing the Securities for investment for your account and not with
any present view toward resale or other distribution thereof; that you agree not
to resell or otherwise dispose of all or any part of the Securities, except as
permitted by law, including, without limitation, any and all applicable
provisions of the Merger Agreement and this Agreement and any regulations under
the Securities Act and applicable state securities laws; that except as provided
in the Merger Agreement and this Agreement, the Company is under no obligation
to register the Securities under the Securities Act or any state securities law
or to supply the information which may be necessary to enable you to sell the
Securities; and that Rule 144 under the Securities Act is not now available as a
basis for exemption from registration of any Securities hereunder.

                  (e) You have adequate means of providing for your current
needs and personal contingencies and have no need for liquidity in connection
with this investment in the Securities.

                  (f) Your overall commitment to investments which are not
readily marketable is not disproportionate to your net worth and your investment
in the Securities will not cause such overall commitment to become excessive.
The acquisition of the Securities by you is consistent with your general
investment objectives.

                  (g) You received an offer concerning the Securities and first
learned of this investment in the state or other jurisdiction listed in the
residence address on the signature page


<PAGE>

hereto, and intend that the state securities laws of that state or other
jurisdiction alone govern this transaction.

                  (H) IF YOU ARE NOT AN ACCREDITED INVESTOR (AS DEFINED IN RULE
501(A) UNDER THE SECURITIES ACT AND AS DETAILED IN "ITEM IV. ACCREDITED INVESTOR
STATUS" AS SET FORTH ON PAGE 16 OF THIS AGREEMENT) YOU HEREBY APPOINT MARK
GALVIN AS YOUR PURCHASER REPRESENTATIVE FOR PURPOSES OF EVALUATING THE MERITS
AND RISKS OF INVESTING IN THE SECURITIES. IF YOU CHOOSE NOT TO APPOINT MARK
GALVIN AS YOUR PURCHASER REPRESENTATIVE, PLEASE CHECK THE APPROPRIATE BOX ON THE
SIGNATURE PAGE (PAGE 13) OF THIS AGREEMENT AND HAVE YOUR PURCHASER
REPRESENTATIVE COMPLETE APPENDIX A. ALONE OR TOGETHER WITH YOUR PURCHASER
REPRESENTATIVE, YOU HAVE SUCH KNOWLEDGE AND EXPERIENCE IN FINANCIAL AND BUSINESS
MATTERS THAT YOU ARE CAPABLE OF EVALUATING THE MERITS AND RISKS OF THE
INVESTMENT IN THE SECURITIES AND YOU HAVE EVALUATED THE MERITS AND RISKS OF
INVESTING IN THE SECURITIES, AND HAVE DETERMINED THAT THE SECURITIES ARE A
SUITABLE INVESTMENT FOR YOU.


                  (i) You hereby acknowledge receipt of the documents described
in Section 3.5 of the Merger Agreement which documents you have (alone or
together with your purchaser representative) reviewed. You acknowledge and
warrant that any exhibits to these documents which were not directly furnished
to you have been made available to you, at your request, prior to consummation
of the transactions contemplated by the Agreement. You further acknowledge and
warrant that, prior to the execution of this Agreement, you have had the
opportunity to ask questions and receive answers from the Company and Target
concerning the terms and conditions of the transactions contemplated by the
Merger Agreement and the issuance of the Securities, and concerning any of the
documents identified above, and to obtain such additional further information
from the Company and Target as you have deemed necessary to verify the accuracy
of the information contained in the documents identified above or any other
information furnished to you.

                  (j) You understand that the representations, warranties and
covenants set forth herein will be relied upon by Target, other stockholders of
Target, the Company, stockholders of the Company and their respective counsel
and accounting firms.


<PAGE>


         Please indicate your acceptance of the foregoing by signing and
returning the enclosed counterpart of this letter, whereupon this Agreement
shall be a binding agreement between the Company and you. You understand that
the Company is expressly relying on the accuracy of the information contained
herein. By signing and returning this letter, you are representing and
warranting that the foregoing information is complete and correct as of the date
hereof. You hereby undertake to promptly notify the Company of any change in the
above information prior to investment in the Company.

                                Very truly yours,

                                EXCEL SWITCHING CORPORATION

                                By:  /s/ Robert P. Madonna
                                    ----------------------------------------
                                Title: President and Chief Executive Officer
                                      --------------------------------------

AGREED TO AND ACCEPTED as of the date first above written.

Name of Seller:
               ------------------------
Name of Person Signing:
                       ----------------
Signature:
          -----------------------------


                         YOU MUST ANSWER THE FOLLOWING:

1.   SELLER IS AN ACCREDITED INVESTOR (AS DEFINED IN RULE 501(A) UNDER THE
     SECURITIES ACT AND AS DETAILED IN "ITEM IV. ACCREDITED INVESTOR STATUS" AS
     SET FORTH ON PAGE 16 OF THIS AGREEMENT)?

                [ ] Yes                    [ ] No

     IF YOU ANSWERED "YES" PLEASE COMPLETE THE BLUE PAGES.

     IF YOU ANSWERED "NO" PLEASE ANSWER QUESTION NO. 2.

2. SELLER HEREBY WISHES TO APPOINT A PURCHASER REPRESENTATIVE OTHER THAN MARK
GALVIN?

                [ ] Yes                    [ ] No

     IF YOU ANSWERED "NO", PLEASE COMPLETE ONLY THE BLUE PAGES.

     IF YOU ANSWERED "YES", PLEASE COMPLETE THE BLUE PAGES AND HAVE YOUR
     DESIGNATED PURCHASER REPRESENTATIVE COMPLETE THE YELLOW PAGES AND RETURN
     THEM WITH THIS COMPLETED SIGNATURE PAGE.


<PAGE>

I. GENERAL INFORMATION

(1) Principal Residence Address:

     -----------------------------------------------------
     (Number and Street)

     ----------------------------------------------Note: Non-principal residence
     (City, State)                       (Zip Code)      addresses and post
                                                         office boxes cannot be
                                                         accepted.

     --------------------------------------
     (Residence Telephone)

(2) Mailing Address (if different from above)

     ------------------------------------------------------
     (Number and Street)

     ---------------------------------------
     (City, State)                     (Zip Code)

(3)  Age:
         ------------------------------

(4)  Citizenship:
                 -------------------------------

(5)  Social Security or Taxpayer I.D. No.:
                                           -----------------------------------

(6) Occupation or Nature of Business:

     --------------------------------------------------------------------------

     --------------------------------------------------------------------------


II.  INVESTMENT KNOWLEDGE AND EXPERIENCE

(1)     The frequency of my investments in marketable securities has been
        (   ) often; (   ) occasional; (   ) seldom; (   ) never.

(2)     The frequency of my investments in private offerings of securities has
        been ( ) often; ( ) occasional; ( ) more than once; ( ) never.


<PAGE>

(3) My private offering investment experience during the past five years
consists of the following:

                              ACTIVITY OF VENTURE
                        (E.G., EQUIPMENT LEASING, REAL     AMOUNT OF ORIGINAL
   NAME OF VENTURE            ESTATE, OIL AND GAS)             INVESTMENT
- --------------------- ---------------------------------- ----------------------

- --------------------- ---------------------------------- ----------------------

- --------------------- ---------------------------------- ----------------------

- --------------------- ---------------------------------- ----------------------

- --------------------- ---------------------------------- ----------------------

(4)     Investment Experience.

        I have made investments, or been involved in activities, of the type
        indicated below in the past five years (recognizing that the types of
        investments listed are not mutually exclusive and certain investments
        may fall into one or more of the categories listed below):

        ____      (a)      Real estate partnerships
        ____      (b)      Research and development partnerships
        ____      (c)      Mutual funds
        ____      (d)      Start-up or early stage corporations
        ____      (e)      Venture capital investments
        ____      (f)      Stocks
        ____      (g)      Bonds, government obligations and other fixed income
                           securities

        Please describe any other investments:
                                              ------------------------

        --------------------------------------------------------------

        --------------------------------------------------------------

        --------------------------------------------------------------

(5)     The total investments of ALL investments indicated in Item (4) above
        were in excess of (indicate highest applicable amount):

        [   ]     $ 50,000                                [   ]  $250,000
        [   ]     $150,000                                [   ]  $500,000

(6)     The amount indicated in Item (4) above includes TOTAL investments in
        start-up or early stage corporation in excess of (indicate highest
        applicable amount):

        [   ]     $  25,000                               [   ]  $100,000
        [   ]     $  50,000                               [   ]  over $150,000



<PAGE>

III.  INCOME AND NET WORTH

(1)  The following represents my gross income from all sources (excluding the
     gross income, if any, of my spouse) calculated by taking into account my
     individual gross income (as reported or to be reported on my income tax
     return) increased by any deduction for long term capital gain, any
     deduction for depletion, any exclusion for interest and any losses of a
     partnership allocated to me. [PLEASE CHECK ONE BOX FOR EACH YEAR]

<TABLE>
     <S>               <C>                        <C>              <C>
     1997 Actual       [ ] $150,000 - 200,000     [ ] $200,000 +   [ ] $__________ (fill in)

     1998 Actual       [ ] $150,000 - 200,000     [ ] $200,000 +   [ ] $__________ (fill in)

     1999 Estimated    [ ] $150,000 - 200,000     [ ] $200,000 +   [ ] $__________ (fill in)
</TABLE>


(2)     My total personal net worth (including the net worth, if any, of my
        spouse), valuing my personal residence at its fair market value (less
        encumbrances) is now estimated at: [PLEASE CHECK ONE]

<TABLE>
      <S>                             <C>                          <C>
      [ ] $ 50,000 - $  100,000       [ ] $  100,000 - $250,000    [ ] $250,000 - $500,000
      [ ] $500,000 - $1,000,000       [ ] $1,000,000 +             [ ] $____________ (fill in)
</TABLE>


(3)     My personal net worth (exclusive of homes, home furnishings and
        automobiles) is now estimated at: [PLEASE CHECK ONE]

<TABLE>
      <S>                             <C>                          <C>
      [ ] $ 50,000 - $  100,000       [ ] $  100,000 - $250,000    [ ] $250,000 - $500,000
      [ ] $500,000 - $1,000,000       [ ] $1,000,000 +             [ ] $____________ (fill in)
</TABLE>


IV.  ACCREDITED INVESTOR STATUS

        Please indicate which category below, if any, describes you:

______1. A natural person whose net worth, either individually or jointly with
such person's spouse, at the time of his purchase, exceeds $1,000,000.


______2. A natural person who had individual income in excess of $200,000, or
joint income with that person's spouse in excess of $300,000, in 1997 and 1998
and reasonably expects to reach the same income level in 1999.

______3. An entity in which all of the equity owners are described in one or
more of the categories set forth in paragraphs 1 and 2 above.


<PAGE>

                           AGREED TO AND ACCEPTED as of the
                           date first above written.

                           Name of Seller:  Mark B. Galvin
                                           -----------------------------------
                           Signature:  /s/ Mark B. Galvin
                                      ----------------------------------------

                           Name of Seller:  Aaron A. Galvin
                                            Frayda Galvin
                                           -----------------------------------

                           Signature:  /s/ Aaron A. Galvin
                                       /s/ Frayda Galvin
                                      ----------------------------------------

                           Name of Seller:  Allan M. Kline
                                           -----------------------------------
                           Signature:  /s/ Allan M. Kline
                                      ----------------------------------------

                           Name of Seller:  Allen A. Hauf
                                           -----------------------------------
                           Signature:  /s/ Allen A. Hauf
                                      ----------------------------------------

                           Name of Seller:  Arnold B. Denton
                                           -----------------------------------
                           Signature:  /s/ Arnold B. Denton
                                      ----------------------------------------

                           Name of Seller:  C.W. Dick
                                           -----------------------------------
                           Signature:  /s/ C.W. Dick
                                      ----------------------------------------

                           Name of Seller:  Charles River Partnership VII
                                           -----------------------------------
                           Signature:  /s/ Michael Zak (General Partner)
                                      ----------------------------------------

                           Name of Seller:  Chris Carroll
                                           -----------------------------------

                           Signature:  /s/ Chris Carroll
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Dennis A. Kirshy
                                           -----------------------------------

                           Signature:  /s/ Dennis A. Kirshy
                                      ----------------------------------------

                           Name of Seller:  Edward J. Los
                                           -----------------------------------

                           Signature:  /s/ Edward J. Los
                                      ----------------------------------------

                           FIRST ALBANY CORPORATION
                           CUSTODIAN FBO JAMES C. SCHWALBE IRA

                           Name of Seller:  First Albany Corporation Custodian
                                               FBO James C. Schwalbe IRA
                                           -----------------------------------

                           Signature:  /s/ Matthew Hurley (Supervisor)
                                      ----------------------------------------
                           Signature:  /s/ Scott Perkins (Guarantor)
                                      ----------------------------------------

                           Name of Seller:  Geoffrey Devin
                                           -----------------------------------

                           Signature:  /s/ Geoffrey Devin
                                      ----------------------------------------

                           Name of Seller:  Gerald A. Friesen
                                           -----------------------------------

                           Signature:  /s/ Gerald A. Friesen
                                      ----------------------------------------

                           Name of Seller:  Gilbert M. Kaufman
                                           -----------------------------------

                           Signature:  /s/ Gilbert M. Kaufman
                                      ----------------------------------------

                           Name of Seller:  HarbourVest Partners V - Direct Fund
                                               L.P.
                                           -----------------------------------

                           By:   HVP V - Direct Associates L.L.C.
                           Its: General Partner

                           By:  HarbourVest Partners, LLC
                           Its: Managing Member

                           Signature:  /s/ Ofer Nemerovsky (Managing Director)
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Harry Newton
                                           -----------------------------------

                           Signature:  /s/ Harry Newton
                                      ----------------------------------------

                           Name of Seller:  InterStock Anstalt
                                           -----------------------------------

                           Signature:  /s/ Heimo Quaderer (Director)
                                       /s/ Edith Hueppi (Director)
                                      ----------------------------------------

                           Name of Seller:  James C. Schwalbe
                                           -----------------------------------

                           Signature:  /s/ James C. Schwalbe
                                      ----------------------------------------

                           Name of Seller:  Jeffery S. Basile
                                           -----------------------------------

                           Signature:  /s/ Jeffery S. Basile
                                      ----------------------------------------

                           Name of Seller:  Joseph C. Genovese
                                           -----------------------------------

                           Signature:  /s/ Joseph C. Genovese
                                      ----------------------------------------

                           Name of Seller:  Joseph H. Reilly
                                           -----------------------------------

                           Signature:  /s/ Joseph H. Reilly
                                      ----------------------------------------

                           Name of Seller:  Kathryn Barrie
                                           -----------------------------------

                           Signature:  /s/ Kathryn Barrie
                                      ----------------------------------------

                           Name of Seller:  Kenneth M. Stess
                                           -----------------------------------

                           Signature:  /s/ Kenneth M. Stess
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Kevin D. Smith
                                            Kathryn B. Smith
                                           -----------------------------------

                           Signature:  /s/ Kevin D. Smith
                                       /s/ Kathryn B. Smith
                                      ----------------------------------------

                           Name of Seller:  Kevin Dick
                                           -----------------------------------

                           Signature:  /s/ Kevin Dick
                                      ----------------------------------------

                           Name of Seller:  Kimberly A. Ward
                                           -----------------------------------

                           Signature:  /s/ Kimberly A. Ward
                                      ----------------------------------------

                           Name of Seller:  Le Serre
                                           -----------------------------------

                           Signature:  /s/ Frank Polestra (Partner)
                                      ----------------------------------------

                           Name of Seller:  Leigh Michl
                                           -----------------------------------

                           Signature:  /s/ Leigh Michl
                                      ----------------------------------------

                           Name of Seller:  Louis Piazza
                                           -----------------------------------

                           Signature:  /s/ Louis Piazza
                                      ----------------------------------------

                           Name of Seller:  Marcia Haskel
                                           -----------------------------------

                           Signature:  /s/ Marcia Haskel
                                      ----------------------------------------

                           Name of Seller:  Margo Bik
                                            Nicholas Bik
                                           -----------------------------------

                           Signature:  /s/ Margo Bik
                                       /s/ Nicholas Bik
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Michael Barza
                                           -----------------------------------

                           Signature:  /s/ Michael Barza
                                      ----------------------------------------

                           Name of Seller:  Michael J. Wood
                                           -----------------------------------

                           Signature:  /s/ Michael J. Wood
                                      ----------------------------------------

                           Name of Seller:  Mitchel Sayare
                                            Susan E. Whitehead
                                           -----------------------------------

                           Signature:  /s/ Mitchel Sayare
                                       /s/ Susan E. Whitehead
                                      ----------------------------------------

                           Name of Seller:  Naresh C. Parmer
                                           -----------------------------------

                           Signature:  /s/ Naresh C. Parmer
                                      ----------------------------------------

                           Name of Seller:  Peter Livingstone
                                           -----------------------------------

                           Signature:  /s/ Peter Livingstone
                                      ----------------------------------------

                           Name of Seller:  Peter S. Rood
                                           -----------------------------------

                           Signature:  /s/ Peter S. Rood
                                      ----------------------------------------

                           Name of Seller:  Philip Arrigo
                                            Frances Arrigo
                                           -----------------------------------

                                       /s/ Frances Arrigo
                           Signature:  /s/ Philip Arrigo
                                      ----------------------------------------

                           Name of Seller:  PCC Transfer Limited Partnership
                                           -----------------------------------

                           Signature:  /s/ Frank Polestra (Manager)
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Pioneer Ventures Limited
                                               Partnership II
                                           -----------------------------------

                           Signature:  /s/ Frank Polestra (President)
                                      ----------------------------------------

                           Name of Seller:  R. Stephen Cheheyl
                                           -----------------------------------

                           Signature:  /s/ R. Stephen Cheheyl
                                      ----------------------------------------

                           Name of Seller:  Reid L. Simpson
                                           -----------------------------------

                           Signature:  /s/ Reid L. Simpson
                                      ----------------------------------------

                           Name of Seller:  Robert J. Grochmal
                                           -----------------------------------

                           Signature:  /s/ Robert J. Grochmal
                                      ----------------------------------------

                           Name of Seller:  Robert J. Grochmal and Debra A.
                                            Grochmal, JTWROS
                                           -----------------------------------

                           Signature:  /s/ Robert J. Grochmal
                                       /s/ Debra A. Grochmal
                                      ----------------------------------------

                           Name of Seller:  Rodger P. Nordblom
                                           -----------------------------------

                           Signature:  /s/ Rodger P. Nordblom
                                      ----------------------------------------

                           Name of Seller:  Ron Pullis
                                           -----------------------------------

                           Signature:  /s/ Ron Pullis
                                      ----------------------------------------

                           Name of Seller:  Rubin Gruber
                                           -----------------------------------

                           Signature:  /s/ Rubin Gruber
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Stefan Gieseler
                                           -----------------------------------

                           Signature:  /s/ Stefan Gieseler
                                      ----------------------------------------

                           Name of Seller:  Steven A. Mulawski
                                           -----------------------------------

                           Signature:  /s/ Steven A. Mulawski
                                      ----------------------------------------

                           Name of Seller:  SVM Star Ventures Enterprises No. V,
                                            a German Civil Law Partnership (with
                                            Limitation of Liability)
                                           -----------------------------------

                           By:  SVM Star Ventures Managementgesellschaft
                                mbH Nr. 3
                                ----------------------------------------------

                           Its:  Managing Partner
                                ----------------------------------------------

                           Signature:  /s/ Meir Barel (Managing Director)
                                      ----------------------------------------

                           Name of Seller:  SVM Star Ventures Enterprises
                                            No. 3 & Co. KG
                                           -----------------------------------

                           By:  SVM Star Ventures Managementgesellschaft
                                mbH Nr. 3
                                ----------------------------------------------

                           Its:  Managing Partner
                                 ---------------------------------------------

                           Signature:  /s/ Meir Barel (Managing Director)
                                      ----------------------------------------

                           Name of Seller:  Terry R. Young
                                           -----------------------------------

                           Signature:  /s/ Terry R. Young
                                      ----------------------------------------

                           Name of Seller:  The MHF Sylvan Fund
                                           -----------------------------------

                           Signature:  /s/ Edward Saxe (Trustee)
                                      ----------------------------------------


<PAGE>

                           Name of Seller:  Thomas W. Mullaney, Jr.
                                           -----------------------------------

                           Signature:  /s/ Thomas W. Mullaney, Jr.
                                      ----------------------------------------

                           Name of Seller:  Warren J. Maxwell
                                           -----------------------------------

                           Signature:  /s/ Warren J. Maxwell
                                      ----------------------------------------

                           WATERLINE CAPITAL, LLC

                           Name of Seller:  Alexander M. Levine
                                           -----------------------------------

                           Signature:  /s/ Alexander M. Levine (Managing
                                       Director
                                      ----------------------------------------

                           Name of Seller:  Richard Hannapel
                                           -----------------------------------

                           Signature:  /s/ Richard Hannapel
                                      ----------------------------------------

                           Name of Seller:  Joseph A. Keelan
                                           -----------------------------------

                           Signature:  /s/ Joseph A. Keelan
                                      ----------------------------------------

                           Name of Seller:  Cassie Dalton Stess Trust
                                           -----------------------------------

                           Signature:  /s/ Kenneth Stess (Trustee)
                                      ----------------------------------------


<PAGE>


                    APPENDIX A - REPRESENTATIVE'S CERTIFICATE

IF YOU CHOOSE NOT TO APPOINT MARK GALVIN AS YOUR PURCHASER REPRESENTATIVE, YOUR
DESIGNATED PURCHASER REPRESENTATIVE MUST FILL OUT THE FOLLOWING CERTIFICATE:

         Stockholder acknowledges that _____________________ will serve as
Purchaser Representative(s) in connection with evaluating the merits and risks
of his or her prospective investment in the securities offered by the Company,
and that said Representative(s) has/have previously disclosed to Stockholder, in
writing, any material relationship between the Representative(s) (or his or
their affiliates) and the Company or its affiliates that now exists or is
mutually understood to be contemplated or that has existed at any time during
the previous two years, and any compensation received or to be received as a
result of such relationship.

         ____________ has been named by the undersigned Stockholder as a person
upon whose advice the Stockholder has relied in evaluating the merits and risks
of investment in the Company. In connection with the proposed investment by the
Stockholder, the Purchaser Representative hereby represents and warrants as
follows:

         (i) Representative is not an affiliate, director, officer or other
employee of the Company or the beneficial owner of 10% or more of any class of
equity interest in the Company;

         (ii) Listed below are all material relationship (and any compensation
received or to be received by the Representative or his affiliates as a result
thereof) between the Representative (or his affiliates) and the Company or its
affiliates that now exist or have existed at any time during the past two years
or are now contemplated:


                 ----------------------------------------------

                 ----------------------------------------------

                 ----------------------------------------------


         (iii) Representative's educational background is as follows (please
state schools attended, degrees and years in which received):

                  -------------     -------------    -------------

                  -------------     -------------    -------------

                  -------------     -------------    -------------



<PAGE>


         (iv) Representative is primarily engaged in the following business or
profession:

                 ----------------------------------------------

                 ----------------------------------------------

                 ----------------------------------------------

         (v) Representative has known the Stockholder for _____ years in the
following capacity:

                 ----------------------------------------------

         (vi) Representative is familiar with the financial position and plans
of the Stockholder.

         (vii) Representative has previously rendered advice to the Stockholder
with respect to an investment of this type.

                  [  ] Yes         [  ] No         If "Yes", please specify:

                 ----------------------------------------------

         (viii) Representative has prior experience in advising persons with
respect to investments of a nature similar to that presently offered by the
Company.

                  [  ] Yes         [  ] No         If "Yes", please specify:

                 ----------------------------------------------

         (ix) Representative has knowledge and experience in financial and
business matters such that he is capable of evaluating, along, or together with
the Stockholder's other purchaser representatives, or together with the
Stockholder, the merits and risks of investment in the Company.


<PAGE>



         In witness whereof, the undersigned have signed this certificate as of
the _____ day of ____________, 1999.


                                       STOCKHOLDER:
                                       ------------


                                       Name:
                                            -----------------------------------


                                       (Address)
                                            -----------------------------------

                                            -----------------------------------


                                       REPRESENTATIVE:
                                       ---------------


                                       Name:
                                            -----------------------------------

                                       (Address)

                                            -----------------------------------

                                            -----------------------------------



                                                                    EXHIBIT 99.1
                                                                    ------------

FOR IMMEDIATE RELEASE
- ---------------------


        EXCEL SWITCHING CORPORATION COMPLETES ACQUISITION OF RASCOM, INC.

HYANNIS, MASS. -- MAY 11, 1999 -- Excel Switching Corporation (Nasdaq: XLSW), a
leading provider of open switching platforms for telecommunications networks
worldwide, today announced it has completed the acquisition of RAScom, Inc. of
Salem, N.H..

On April 15, 1999 Excel announced that it had signed a definitive agreement to
acquire privately-held RAScom, Inc., a leading provider of remote access server
(RAS) technology. The acquisition of RAScom will expand Excel's addressable
market by adding data capabilities to its Expandable Switching System (EXS)
product line for the Internet Service Provider (ISP) and Competitive Local
Exchange Carrier (CLEC) markets.

Under the terms of the acquisition, Excel acquired all outstanding shares and
options of RAScom in exchange for approximately 1.1 million shares of Excel
common stock, valued at approximately $24 million. The transaction was accounted
for as a pooling of interests transaction and qualified as a tax-free
reorganization.

ABOUT EXCEL
- -----------
Excel Switching Corporation is a leading provider of open switching platforms
for telecommunications networks worldwide. Excel develops, manufactures, markets
and supports a family of open, programmable, carrier-class voice and data
gateways that address the complex needs of network providers. Excel's products
are currently deployed in telecommunications networks worldwide. Visit Excel's
website at http://www.xl.com.
                                     (more)

<PAGE>


EXCEL SWITCHING COMPLETES ACQUISITION OF RASCOM                           PAGE 2


NOTE TO INVESTORS:
- ------------------
This release contains forward-looking statements that are made pursuant to the
Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995.
The forward-looking statements contained in this release are subject to a number
of risks and uncertainties that could cause actual results to differ materially
from the company's expectations. Factors that might cause such a difference
include, but are not limited to, those relating to Excel's highly competitive
market; risks associated with Excel's concentrated product family and new
product introductions; the evolving market for telecommunications services and
rapid technological change; possible delayed or lengthy sales cycles; risks
relating to acquisitions; risks associated with efficiently and effectively
integrating RAScom's product offerings and personnel; risks associated with
international sales; dependence on and concentration of relationships with
application developers, original equipment manufacturers and systems
integrators; Excel's dependence on its proprietary rights; and other risks
identified in the Company's Securities and Exchange Commission filings including
those risks identified in the section entitled "Risk Factors" of the Company's
Annual Report on Form 10-K for the year ended December 31, 1998. Product and
service names used within are trademarks, registered trademarks and service
marks of their respective owners.


                                      ####

CONTACTS:
- --------------------------------------------------------------------------------
Erica Robinson                                         Deborah Shih
Excel Switching Corporation                            FitzGerald Communications
(508) 862-3000                                         (617) 494-9500
[email protected]                                       [email protected]



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