ADVANCED SWITCHING COMMUNICATIONS INC
424B3, 2000-10-05
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1

                                                Filed pursuant to rule 424(b)(3)
                                                   Registration number 333-40624

PROSPECTUS

                 [ADVANCED SWITCHING COMMUNICATIONS, INC. LOGO]

                                6,250,000 Shares
                                  COMMON STOCK

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

ADVANCED SWITCHING COMMUNICATIONS, INC. IS OFFERING SHARES OF ITS COMMON STOCK.
THIS IS OUR INITIAL PUBLIC OFFERING AND NO PUBLIC MARKET CURRENTLY EXISTS FOR
OUR SHARES.

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

OUR COMMON STOCK HAS BEEN APPROVED FOR QUOTATION ON THE NASDAQ NATIONAL MARKET
UNDER THE SYMBOL "ASCX."

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

INVESTING IN THE COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING ON
PAGE 5.

                            ------------------------
                               PRICE $15 A SHARE
                            ------------------------

<TABLE>
<CAPTION>
                                                                 UNDERWRITING
                                                 PRICE TO        DISCOUNTS AND      PROCEEDS TO
                                                  PUBLIC          COMMISSIONS         COMPANY
                                                 --------        -------------      -----------
<S>                                             <C>              <C>                <C>
Per Share.....................................    $15.00            $1.05             $13.95
Total.........................................  $93,750,000      $6,562,500         $87,187,500
</TABLE>

Advanced Switching Communications, Inc. has granted the underwriters the right
to purchase up to an additional 937,500 shares to cover over-allotments.

The Securities and Exchange Commission and state securities regulators have not
approved or disapproved these securities, or determined if this prospectus is
truthful or complete. Any representation to the contrary is a criminal offense.

Morgan Stanley & Co. Incorporated expects to deliver the shares to purchasers on
October 10, 2000.

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

MORGAN STANLEY DEAN WITTER

                                   CHASE H&Q

                                                              ROBERTSON STEPHENS

October 4, 2000
<PAGE>   2

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Prospectus Summary....................    1
Risk Factors..........................    5
Special Note Regarding Forward-Looking
  Statements..........................   13
Use of Proceeds.......................   14
Dividend Policy.......................   14
Capitalization........................   15
Dilution..............................   16
Selected Financial Data...............   17
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   19
Business..............................   27
</TABLE>

<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Management............................   40
Certain Transactions..................   49
Principal Stockholders................   53
Description of Securities.............   55
Shares Eligible for Future Sale.......   58
United States Tax Consequences to Non-
  United States Holders...............   60
Underwriters..........................   64
Legal Matters.........................   66
Experts...............................   66
Where You Can Find More Information...   66
Index to Financial Statements.........  F-1
</TABLE>

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

     UNTIL OCTOBER 29, 2000, 25 DAYS AFTER COMMENCEMENT OF THIS OFFERING, ALL
DEALERS THAT BUY, SELL OR TRADE SHARES, WHETHER OR NOT PARTICIPATING IN THIS
OFFERING, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS IS IN ADDITION TO THE
DEALERS' OBLIGATION TO DELIVER A PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH
RESPECT TO THEIR UNSOLD ALLOTMENTS OR SUBSCRIPTIONS.
<PAGE>   3

                               PROSPECTUS SUMMARY

     You should read the following summary together with the more detailed
information regarding our company and the common stock being sold in this
offering and our financial statements and notes thereto appearing elsewhere in
this prospectus.

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

     We design and market a line of products that enable telecommunications
service providers to offer high speed, or broadband, services to end-users. Our
broadband access platforms are compact and software-configurable products that
enable our customers to transmit voice, data and multimedia communications
traffic more rapidly and cost-effectively while preserving their investments in
existing communications systems. In response to the rapid increase in data
communications traffic driven by the growth of the Internet and worldwide
deregulation, telecommunications service providers are rapidly building advanced
packet-based networks. Packet-based networks, which transport communications
traffic in small bundles, or "packets," offer a significantly more flexible,
cost-effective and efficient means for providing communications services than
existing circuit-based networks, which were designed years ago to carry
telephone calls. Telecommunications service providers typically situate
high-speed packet transmission equipment at the core or backbone of their
networks, but rely on voice-oriented technology for their access networks. Our
products are deployed at the entry points to a telecommunications network. These
sites, which serve as staging areas for the delivery of telecommunications
services to the end-user, are called central offices for local telephone
companies or points of presence for most other telecommunications service
providers. By extending the benefits of packet technology beyond the network
core, our products reduce transmission and operating costs, increase the
efficiency of core network equipment, provide access to fiber optic core
networks and allow our customers to develop networks for broadband services. We
market our products to telecommunications service providers worldwide, focusing
on established as well as emerging carriers, multi-tenant unit service providers
and digital subscriber line service providers. We currently have 27 customers in
three market segments. Broadband Office, 2nd Century Communications and Access
Lan accounted for 53%, 11% and 10% of our revenue, respectively, for the six
months ended June 30, 2000. We sell our products primarily through a direct
sales force. We also increase awareness and customer acceptance of our products
through strategic relationships with original equipment manufacturers,
distributors and resellers.

     We designed our product line to meet the requirements of broadband service
providers worldwide. Our products offer the following benefits and features:

     - Enhanced Revenue Opportunities.  Our product design and multi-service
       capabilities enable service providers to efficiently add services and
       quickly penetrate new markets to capitalize on new revenue opportunities,
       with relatively low initial investment.

     - Highly Scalable Product Architecture.  Our products are designed to
       proportionally meet our customers' network requirements. In small
       markets, a customer can deploy services with a single card in a stackable
       platform and add platforms as demand grows. In large markets, customers
       can deploy our multiple card system using the same individual cards from
       the stackable platforms.

     - Multi-Service Capabilities.  Our products' ports, which transmit and
       receive data to and from physical access lines, are
       software-configurable, which means that they eliminate the need for
       service providers to predetermine the number of ports dedicated to each
       specific service. Service providers that use our products can set up or
       change the services supported on individual ports from a remote computer
       terminal. This enables our customers to quickly add services, with
       minimal service disruption and without dispatching personnel to
       physically change an end user's connection.

     - Reduced Operating Costs.  Our products convert different end-user
       services to a single format for transmission to the core network,
       eliminating the need to deploy multiple core networks, one for each
       service offered. Our products also aggregate the local access lines that
       carry these services into fewer

                                        1
<PAGE>   4

       high-speed optical or electrical connections to the core network,
       allowing core network equipment to operate more efficiently. This service
       conversion and access line aggregation reduces the costs of building and
       operating a service provider network.

     - Interoperability with Existing Systems.  Our products comply with
       stringent network facility standards for central office equipment and
       operate with leading core network components, allowing service providers
       to capitalize on the value of their existing investments. Our products
       utilize industry standard protocols and have built-in software
       flexibility to add new protocols as they are adopted and standardized in
       the marketplace.

     - Space and Physical Design Advantages.  Our equipment's compact design and
       high port density of our equipment means that it occupies minimal space
       at central offices, multi-tenant unit office buildings, or other points
       of presence. In addition, the lower power requirements and the low heat
       output of our products allow service providers to deploy services to
       locations previously excluded from the network because of the physical
       limitations of the space.

     Our objective is to become a leading provider of broadband access platforms
for integrated voice, data and multimedia services. To achieve our objective, we
intend to:

     - broaden our customer base domestically and internationally;

     - leverage our technology leadership from the access network into the
       network core;

     - provide our customers with a smooth migration path to next-generation
       network architectures;

     - expand our global sales efforts and our customer service and support
       capabilities; and

     - continue to outsource our product manufacturing.

     Given our limited operating history and the competitive environment in our
industry, we may face a number of difficulties in achieving our objective. Prior
to 1999, we were a development stage company principally engaged in research and
development. We shipped our first product in March 1999. We depend on a single
contract manufacturer to manufacture substantially all of our products. We
derive a substantial portion of our revenue from a limited number of customers.
We have incurred significant losses since our inception and as of June 30, 2000
we had an accumulated deficit of $25.6 million. We expect to continue to incur
net losses. For a discussion of these and other risks that may adversely affect
our ability to become a leading provider of broadband access platforms, see
"Risk Factors" beginning on page 5.

     We were incorporated in 1997 under the laws of the State of Delaware. Our
headquarters are located at 8330 Boone Boulevard, Vienna, Virginia 22182, and
our telephone number is (703) 448-5540. Our website address is www.asc.com. The
information contained on our website is not part of this prospectus.

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

     Except as otherwise indicated, information in this prospectus is based on
the following assumptions:

     - all outstanding shares of our redeemable convertible preferred stock will
       be converted into shares of common stock immediately prior to the
       completion of this offering;

     - the underwriters will not exercise their over-allotment option; and

     - we will file our amended and restated certificate of incorporation upon
       the completion of this offering.

                                        2
<PAGE>   5

                                  THE OFFERING

<TABLE>
<S>                                               <C>
Common stock offered............................  6,250,000 shares
Common stock to be outstanding after the
  offering......................................  41,115,883 shares

Over-allotment option...........................  937,500 shares

Use of proceeds.................................  We intend to use the net proceeds for
                                                  working capital and other general corporate
                                                  purposes. See "Use of Proceeds" on page 14

Nasdaq National Market symbol...................  ASCX
</TABLE>

     The foregoing information is based upon shares outstanding as of September
30, 2000 and excludes:

     - 5,422,245 shares of common stock issuable upon the exercise of options
       outstanding as of September 30, 2000 with a weighted average exercise
       price of $4.48 per share;

     - 359,000 shares of common stock issuable upon the exercise of warrants
       outstanding as of September 30, 2000 with a weighted average exercise
       price of $10.61 per share;

     - 4,736,755 shares of common stock reserved for additional option grants
       under our stock plans as of September 30, 2000; and

     - additional shares of common stock issuable upon conversion of our
       outstanding preferred stock in respect of dividends accruing after
       September 30, 2000.
                            ------------------------------

     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell shares of common stock and
seeking offers to buy shares of common stock, only in jurisdictions where offers
and sales are permitted.

                                        3
<PAGE>   6

                             SUMMARY FINANCIAL DATA

<TABLE>
<CAPTION>
                                         PERIOD FROM
                                          INCEPTION
                                        (SEPTEMBER 10,                            SIX MONTHS
                                            1997)            YEAR ENDED             ENDED
                                           THROUGH          DECEMBER 31,           JUNE 30,
                                         DECEMBER 31,    ------------------   ------------------
                                             1997         1998       1999      1999       2000
                                        --------------   -------   --------   -------   --------
                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                     <C>              <C>       <C>        <C>       <C>
STATEMENT OF OPERATIONS DATA:
Revenue...............................      $   --       $    --   $  4,278   $   402   $ 12,933
Gross profit..........................          --            --      1,439        65      3,377
Loss from operations..................        (309)       (5,127)    (9,781)   (4,732)   (10,146)
Net loss..............................        (293)       (5,111)    (9,329)   (4,640)    (9,090)
Accretion of transaction costs and
  accrued dividends on redeemable
  convertible preferred stock.........          --          (367)    (2,589)     (482)    (2,815)
                                            ------       -------   --------   -------   --------
Net loss applicable to common
  shareholders........................      $ (293)      $(5,478)  $(11,918)  $(5,122)  $(11,905)
                                            ======       =======   ========   =======   ========
Basic and diluted net loss per
  share...............................      $(0.05)      $ (0.48)  $  (1.01)  $ (0.43)  $  (1.03)
                                            ======       =======   ========   =======   ========
Shares used in computing net loss per
  share...............................       5,742        11,389     11,789    11,958     11,601
                                            ======       =======   ========   =======   ========
Pro forma basic and diluted net loss
  per share(1)........................                             $  (0.38)            $  (0.28)
                                                                   ========             ========
Shares used in computing pro forma
  basic and diluted net loss per
  share(1)............................                               24,251               32,462
                                                                   ========             ========
</TABLE>

<TABLE>
<CAPTION>
                                                                    AS OF JUNE 30, 2000
                                                         ------------------------------------------
                                                                                       PRO FORMA
                                                          ACTUAL    PRO FORMA (2)   AS ADJUSTED (3)
                                                         --------   -------------   ---------------
                                                                       (IN THOUSANDS)
<S>                                                      <C>        <C>             <C>
BALANCE SHEET DATA:
Cash and cash equivalents..............................  $  5,464      $ 5,464         $ 91,452
Working capital........................................    20,082       20,082          106,070
Total assets...........................................    43,952       43,952          129,940
Long-term debt, less current portion...................        37           37               37
Redeemable convertible preferred stock.................    58,383           --               --
Total stockholders' equity (deficit)...................   (25,371)      33,012          119,000
</TABLE>

---------------
    (1) Pro forma net loss per share for the year ended December 31, 1999 and
        the six months ended June 30, 2000 is computed using the weighted
        average number of common shares outstanding, including the pro forma
        effects of the automatic conversion of our outstanding preferred stock
        into shares of common stock effective upon the completion of this
        offering as if such conversion occurred on January 1, 1999, or at date
        of original issuance, if later.

    (2) Pro forma to give effect to the conversion of all issued and outstanding
        shares of redeemable convertible preferred stock into common stock.

    (3) As adjusted to reflect the sale of 6,250,000 shares of common stock
        offered hereby at the initial public offering price of $15 per share
        after deducting the underwriting discount and estimated offering
        expenses payable by us. See "Use of Proceeds" on page 14 for more
        information on our intended use of the proceeds from this offering and
        "Capitalization" on page 15 for more information on our capital
        structure.

                                        4
<PAGE>   7

                                  RISK FACTORS

     You should carefully consider the risks described below before making a
decision to invest in our common stock.

RISKS RELATED TO OUR BUSINESS AND FINANCIAL PERFORMANCE

     OUR LIMITED OPERATING HISTORY MAY MAKE IT DIFFICULT TO VALUE AND EVALUATE
OUR BUSINESS AND OUR FUTURE PROSPECTS

     We commenced operations in September 1997 and commercially released our
first product in the first quarter of 1999. Your evaluation of the risks and
uncertainties of our business will be difficult because of our limited operating
history. In addition, our limited operating history means that we have less
insight into how technological and market trends may affect our business. The
revenue and income potential of our business and market are unproven. You must
consider our business and prospects in light of the risks and difficulties
typically encountered by companies in their early stages of development,
particularly those in new, rapidly evolving and highly competitive markets such
as the market for broadband access solutions.

     WE HAVE INCURRED SUBSTANTIAL LOSSES TO DATE AND MAY NOT BE ABLE TO ACHIEVE
OR MAINTAIN PROFITABILITY, WHICH COULD CAUSE OUR STOCK PRICE TO DECLINE

     Since we began operations, we have incurred net losses in every fiscal
period. We incurred a net loss of $9.1 million in the first six months of 2000
and our accumulated deficit through June 30, 2000 was $25.6 million. We expect
to incur net losses in the future. Our operating losses have been due in part to
the commitment of significant resources to our research and development and
sales and marketing organizations. We expect our expenses to continue to
increase in an effort to develop our business and, as a result, we will need to
generate significant revenue to achieve profitability. We cannot be certain if
or when we will become profitable. Our failure to become profitable within the
timeframe expected by investors may adversely affect the market price of our
common stock.

     UNEXPECTED FLUCTUATIONS IN OUR OPERATING RESULTS MAY CAUSE OUR STOCK PRICE
TO DECLINE

     Our operating results are difficult to forecast and may fluctuate
significantly from quarter to quarter. As a result of our limited operating
history, we do not have historical financial data for a significant number of
periods upon which to forecast quarterly financial performance. It is likely
that in some future quarters, our operating results may fall below the
expectations of investors or securities analysts, which could cause the price of
our common stock to fall substantially.

     IF WE FAIL TO INCREASE OUR REVENUE, OR IF WE EXPERIENCE DELAYS IN
GENERATING REVENUE, WE WILL CONTINUE TO INCUR SUBSTANTIAL OPERATING LOSSES.

     We plan to significantly increase our operating expense to fund greater
levels of research and development, expand our sales and marketing operations,
broaden our customer support capabilities and develop new distribution channels.
We also plan to expand our general and administrative capabilities to address
the demands resulting from this offering and the continued growth of our
business. Our operating expenses are largely based on anticipated personnel
requirements and revenue trends, and a high percentage of our expenses are, and
will continue to be, fixed. In addition, we may be required to spend more in
research and development than originally budgeted in order to respond to
industry trends. As a result, if we fail to increase our revenue, or if we
experience delays in generating revenue, we will continue to incur substantial
operating losses.

     THERE IS INTENSE COMPETITION IN THE MARKET FOR BROADBAND ACCESS SOLUTIONS
AND IF WE FAIL TO COMPETE SUCCESSFULLY, OUR REVENUE COULD DECLINE AND WE COULD
EXPERIENCE ADDITIONAL LOSSES

     The market for broadband access solutions is new, rapidly evolving and very
competitive. We expect competition in this market to increase as a result of a
number of factors, including the entrance of new or larger competitors and the
introduction of new products or technologies. This competition could, among
other things:

     - divert sales from us;

     - force us to charge lower prices; and

                                        5
<PAGE>   8

     - adversely affect our strategic relationships with manufacturers,
       resellers and others.

If any of these risks occurred, our revenues could decline, our gross margins
could decrease, our expenses could increase and we could experience additional
losses. Our principal competitors may be different depending on the market we
target, and include large networking equipment companies such as Alcatel, Cisco
Systems, Lucent Technologies, Marconi(Fore) and Nortel Networks, as well as
companies such as Accelerated Networks, ADC Kentrox, and Tiara Networks.

     Many of our current and potential competitors are large public companies
that have longer operating histories and significantly greater financial,
technical, marketing and other resources than we do. As a result, these
competitors are able to devote greater resources to the development, promotion,
sale and support of their products. In addition, competitors with large market
capitalization or cash reserves are much better positioned than we are to
acquire other companies, including our competitors, and thereby acquire new
technologies or products that may displace our product lines.

     WE PURCHASE SEVERAL OF OUR KEY COMPONENTS FROM SINGLE SOURCES, AND WE COULD
LOSE REVENUE AND MARKET SHARE IF WE ARE UNABLE TO OBTAIN A SUFFICIENT SUPPLY OF
THOSE COMPONENTS

     Several key components of our products are currently available from single
or limited sources with whom we have no guaranteed supply agreements, including:

     - programmable chips supplied by Lucent Technologies;

     - asynchronous transfer mode, or ATM, chips supplied by Conexant Systems
       Inc.; and

     - circuit emulation chips supplied by PMC-Sierra, Inc.

If we are unable to obtain a sufficient supply of these or other critical
components from our current vendors:

     - we may be unable to manufacture and ship our products on a timely basis,
       which could result in lost or delayed revenue, harm to our reputation,
       increased manufacturing costs and exposure to claims by our customers;
       and

     - we may be forced either to develop alternative sources of supply or to
       modify the design of our products to use more readily available
       components, which may take a long time and may involve significant
       additional expense.

For example, during the first quarter of 2000, we encountered delays in
receiving programmable chips used in our A-1240 product, which resulted in
production delays. In addition, our vendors may increase their prices for these
components. Accordingly, the lack of alternative sources for these components
may also force us to pay higher prices for these components, which would cause
our gross margins to decrease.

     WE ARE ENTIRELY DEPENDENT ON OUR LINE OF BROADBAND ACCESS PLATFORM PRODUCTS
AND OUR PRODUCTS MAY NOT BE READILY ACCEPTED

     Widespread commercial acceptance of our products is critical to our future
success. To date, our A-1000, A-2000, A-1240, A-3010 and A-4000 products are the
only products that we have sold and we expect that revenue from these products
will account for a substantial portion of our revenue for the foreseeable
future. We intend to develop and introduce new products and enhancements to
existing products in the future. If our target customers do not adopt, purchase
and successfully deploy our current and planned products, our revenue will not
grow significantly. The acceptance of our products may be hindered by:

     - the failure of prospective customers to recognize the value of broadband
       access platform products;

     - the reluctance of our prospective customers to replace or expand their
       current access equipment, which may be supplied by more established
       vendors, with our products; and

     - the emergence of new technologies or industry standards that could cause
       our products to be less competitive or become obsolete.

                                        6
<PAGE>   9

     BECAUSE MOST OF OUR SALES ARE MADE UNDER SHORT-TERM PURCHASE ORDERS, WE MAY
EXPEND SIGNIFICANT RESOURCES AND BE UNABLE TO RECOVER THE COSTS IF OUR CUSTOMERS
FAIL TO PURCHASE ADDITIONAL PRODUCTS

     Our contracts and purchase orders are separately negotiated with each of
our customers and the terms may vary widely. A majority of our sales are made
under short-term purchase orders for one or a few of our products at one time
instead of long-term contracts for large scale deployment of our products. These
purchase orders do not ensure that they will purchase any additional products
other than those specifically listed in the order. Moreover, since we believe
that these purchase orders represent the early portion of longer term customer
programs, we expend significant financial and personnel resources and expand our
operations to be able to fulfill these programs. If our customers fail to
purchase additional products to expand their programs as we expect, we may be
unable to recover the costs we incurred.

     OUR CUSTOMER CONTRACTS ALLOW OUR CUSTOMERS TO TERMINATE WITHOUT SIGNIFICANT
PENALTIES

     Our contracts are generally non-exclusive and contain provisions allowing
our customers to terminate them without significant penalties. Our contracts
also may specify the achievement of shipment, delivery and installation
commitments. We are generally able to meet these commitments or negotiate
extensions with our customers. However, if we fail to meet these commitments in
a timely manner, our customers may choose to terminate their contracts with us
or impose monetary penalties. If our customers elect to terminate their
contracts with us, our future revenues would be reduced.

     WE DEPEND UPON A SINGLE CONTRACT MANUFACTURER TO MANUFACTURE SUBSTANTIALLY
ALL OF OUR PRODUCTS. IF THAT MANUFACTURER IS UNABLE OR UNWILLING TO MANUFACTURE
A SUFFICIENT QUANTITY OF OUR PRODUCTS, OUR REVENUE MAY DECLINE AND OUR CUSTOMER
RELATIONSHIPS MAY BE DAMAGED

     We currently subcontract the manufacturing and testing of substantially all
of our products to Benchmark Electronics, an independent manufacturer with whom
we have no long-term agreement. Our reliance on a single manufacturer exposes us
to a number of risks, including reduced control over manufacturing capacity,
product completion and delivery times, product quality and manufacturing costs.
If, as we anticipate, we experience increased demand for our products and
introduce new products and product enhancements, the challenges we face in
managing our relationship with Benchmark will be increased. If Benchmark is
unable or unwilling to manufacture a sufficient quantity of products for us, on
the time schedules and with the quality that we demand:

        - we may not be able to fulfill customer orders on a timely basis; and

        - we may be forced to engage additional or replacement manufacturers,
          which is expensive and time consuming.

If that occurs, our revenue may decline and our customer relationships may be
damaged.

     IF WE FAIL TO PREDICT OUR MANUFACTURING AND COMPONENT REQUIREMENTS
ACCURATELY, WE COULD INCUR ADDITIONAL COSTS OR EXPERIENCE MANUFACTURING DELAYS

     We provide forecasts of our demand to our contract manufacturer and
component vendors up to six months prior to scheduled delivery of products to
our customers. If we overestimate our requirements, we may have excess
inventory, which could increase our costs and harm our relationships with our
contract manufacturer and component vendors by reducing our future orders. If we
underestimate our requirements, we may have an inadequate inventory of
components. Inadequate inventory could interrupt manufacturing of our products
and result in delays in shipments. In addition, lead times for materials and
components that we order are long and depend on factors such as the procedures
of, or contract terms with, a specific supplier and demand for each component at
a given time. In the case of some components in short supply, component vendors
have imposed strict allocations that limit the number of these components they
will supply to a given customer in a specified time period. These vendors may
choose to increase allocations to larger, more established companies, which
could reduce our allocations and harm our ability to manufacture our products.

     DUE TO THE LONG AND UNPREDICTABLE SALES CYCLE FOR OUR PRODUCTS, THE TIMING
OF REVENUE IS DIFFICULT TO PREDICT AND MAY CAUSE OUR OPERATING RESULTS TO
FLUCTUATE UNEXPECTEDLY

     The sales and deployment cycle for our products is lengthy and varies
substantially from customer to customer; it may extend for six months or more.
The length of our sales cycle may cause our revenue and

                                        7
<PAGE>   10

operating results to vary unexpectedly from quarter to quarter. A customer's
decision to purchase our products involves a significant commitment of its
resources and a lengthy evaluation and product qualification process.
Consequently, we may incur substantial expenses and devote senior management
attention to potential relationships that never materialize, in which event our
investments will largely be lost and we may miss other opportunities.

     BECAUSE WE DERIVE A SUBSTANTIAL PORTION OF OUR REVENUE FROM A LIMITED
NUMBER OF CUSTOMERS, ANY LOSS OF OR DELAY IN RECEIVING REVENUE FROM THOSE
CUSTOMERS COULD SIGNIFICANTLY DAMAGE OUR FINANCIAL PERFORMANCE

     We have historically derived a significant portion of our revenue from a
relatively small number of customers. If any of these customers stop or delay
purchasing products or services from us, our financial performance would be
negatively impacted. For the year ended December 31, 1999, 2nd Century
Communications and AccessLan accounted for 22% and 53% of our revenue. These
same customers accounted for 11% and 10% of our revenue for the six months ended
June 30, 2000. One additional customer, Broadband Office, accounted for 53% of
our revenue for the six months ended June 30, 2000. Most of our customers are
not contractually obligated to purchase future products or services from us, and
they may discontinue doing so at any time. In addition, although our largest
customers will probably vary from period to period, we anticipate that a small
number of customers will continue to represent a large percentage of our revenue
in any given fiscal period. Accordingly, the failure to obtain a significant
order from a customer within the fiscal period expected by us could have a
significant adverse effect on our financial performance for that fiscal period.

     WE ANTICIPATE THAT THE AVERAGE SELLING PRICES OF OUR PRODUCTS WILL DECLINE,
WHICH COULD REDUCE OUR GROSS MARGINS AND REVENUE

     Our industry has experienced rapid erosion of average product selling
prices. We anticipate that the average selling prices of our products will
decline in response to competitive pressures, increased sales discounts, new
product introductions by our competitors or other factors. We are seeking to
improve our product design to reduce our costs and increase our sales. If we are
unable to do so, declines in average selling prices will reduce our gross
margins and revenue.

     IF NETWORK SERVICE PROVIDERS CHOOSE A PROTOCOL OTHER THAN ATM FOR THEIR
CORE NETWORKS AND WE ARE NOT ABLE TO ADAPT TO THE CHANGE, OUR TARGET MARKET
COULD BE REDUCED

     While we have designed a product that is adaptable to many communications
protocols, our initial architecture is based on an ATM infrastructure. In the
service providers' networks ATM competes with other protocols such as time
division multiplexing (TDM) and Internet protocol (IP). We believe that an
eventual migration to an IP-based protocol is possible. To the extent that
network service providers choose a protocol other than ATM for their core
networks, we may not be able to react in time or adapt to the change and our
target market could be substantially reduced.

     IF WE ARE NOT SUCCESSFUL IN DEVELOPING AND MARKETING, OR IF WE ARE DELAYED
IN INTRODUCING, NEW AND ENHANCED PRODUCTS AND FEATURES THAT KEEP PACE WITH
TECHNOLOGY AND OUR CUSTOMERS' NEEDS AND EXPECTATIONS, OUR SALES AND COMPETITIVE
POSITION WILL SUFFER

     The market for broadband access solutions is characterized by rapidly
changing technologies, frequent new product introductions and evolving customer
requirements and industry standards. In order to remain competitive, we will
need to introduce on a timely basis new products or product enhancements that
offer significantly improved performance and features, at lower prices, and we
may not be successful in doing so. Some prior versions of our products were
released behind schedule, and this may happen again in the future. Delays in
introducing new products and features, or the introduction of new products which
do not meet the evolving demands of our customers, could damage our reputation
and cause a loss of or delay in revenue.

     IF WE DO NOT EXPAND OUR DIRECT AND INDIRECT SALES CHANNELS, WE MAY BE
UNABLE TO INCREASE MARKET AWARENESS AND SALES OF OUR PRODUCTS, WHICH MAY PREVENT
US FROM ACHIEVING AND MAINTAINING PROFITABILITY

     Our products and services require a technical sales effort targeted at
several key people within each of our prospective customers' organizations. Our
sales efforts require the attention of sales personnel and specialized system
engineers with extensive experience in networking technologies. Competition for
these individuals is

                                        8
<PAGE>   11

intense, and we may not be able to hire sufficient numbers of qualified sales
personnel and specialized system engineers. We also plan to expand our
relationships with resellers and original equipment manufacturers. If we fail to
develop or cultivate relationships with significant resellers or original
equipment manufacturers, or if these resellers and original equipment
manufacturers are not successful in their sales efforts, our business may be
harmed. Many of our resellers also sell our competitors' products. Failure to
expand these channels could adversely affect our revenues and operating results.

     IF WE DO NOT EXPAND OUR CUSTOMER SERVICE AND SUPPORT ORGANIZATION, WE MAY
BE UNABLE TO INCREASE OUR SALES

     In response to our growing base of product installations, we will need to
increase our customer service and support organization to support new and
existing customers. We generally do not enter into service contracts as part of
our sales process, and our products have not required extensive servicing to
date. However, as our product base continues to expand, we intend to offer an
enhanced level of customer support on a post-product sale basis both to generate
additional revenue opportunities and to distinguish us from our competitors. Our
products are complex and require highly-trained customer service and support
personnel. Hiring customer service and support personnel is difficult in our
industry due to the limited number of people available with the necessary
technical skills. If we are unable to expand our customer service and support
organization and train our personnel rapidly, we may not be able to increase
sales.

     IF WE ARE NOT ABLE TO HIRE AND RETAIN QUALIFIED PERSONNEL, OR IF WE LOSE
KEY PERSONNEL, WE MAY BE UNABLE TO MANAGE OR GROW OUR BUSINESS

     The growth of our business and revenue depends in large part upon our
ability to attract and retain sufficient numbers of highly skilled employees,
particularly qualified sales and engineering personnel. Qualified personnel are
in great demand throughout our industry, particularly in the Washington, D.C.
metropolitan area. We may not be successful in hiring and retaining the skilled
personnel that we need.

     Our future success also depends to a significant degree on the skills and
efforts of Asghar Mostafa, our co-founder, Chairman of the Board and Chief
Executive Officer, and on the ability of our other executive officers and
members of senior management to work effectively as a team. The loss of the
services of Mr. Mostafa or one or more of our other executive officers or senior
management members could have a material adverse effect on our financial
performance and ability to compete.

     OUR COMPANY IS GROWING RAPIDLY AND WE MAY BE UNABLE TO MANAGE OUR GROWTH
EFFECTIVELY, WHICH COULD RESULT IN LOST SALES OR DISRUPTIONS TO OUR BUSINESS

     Our failure to effectively manage our recent and anticipated growth could
have a material adverse effect on the quality of our products, our ability to
retain key personnel and our financial performance. From June 30, 1999 to June
30, 2000, the number of our employees increased from 50 to 122. In addition, the
proceeds of this offering will be used in part to further expand our operations
and increase the number of our employees. This growth has strained, and may
further strain, our management, operational systems and other resources. To
manage our growth effectively, we must be able to enhance our financial and
accounting systems and controls, integrate new personnel and manage expanded
operations. We may not be able to do so.

     WE ARE BEGINNING TO EXPAND OUR INTERNATIONAL BUSINESS, WHICH EXPOSES US TO
ADDITIONAL RISKS THAT WE DO NOT FACE IN OUR U.S. BUSINESS

     In 1999, we derived approximately 10% of our revenue from sales outside the
United States, and we expect that percentage to increase as our business grows.
An expanded international business exposes us to a number of risks that we do
not have to address in our U.S. operations. These risks include:

     - longer sales cycles;

     - challenges and costs inherent in managing geographically dispersed
       operations;

     - protectionist laws and business practices that favor local competitors;

     - difficulties in finding and managing local resellers;

     - diverse and changing governmental laws and regulations, including greater
       regulation of the telecommunications industry; and

                                        9
<PAGE>   12

     - foreign currency exchange rate fluctuations.

     If we are unsuccessful in addressing these risks, our international
business will not achieve the revenue or profits we expect.

     IF OUR PRODUCTS DO NOT COMPLY WITH EVOLVING INDUSTRY STANDARDS, WE MAY LOSE
SALES AND INCUR ADDITIONAL EXPENSES

     Our success depends in part on both the adoption of industry standards for
technologies in the broadband access solutions market and our products'
compliance with those industry standards as different standards emerge, evolve
and achieve acceptance. The absence of industry standards for a particular
technology may prevent widespread adoption of products based on that technology.
In addition, because many technological developments occur prior to the adoption
of related industry standards, we may develop products that do not comply with
the industry standards that are eventually adopted, which would hinder our
ability to sell those products. Moreover, if a competitor obtains a leadership
position in selling broadband access products, that competitor may have the
ability to establish de facto standards within the industry.

     IF OUR PRODUCTS CONTAIN DEFECTS OR FAIL TO PERFORM PROPERLY OR WORK
EFFECTIVELY WITH OUR CUSTOMERS' NETWORKS, WE COULD LOSE REVENUE AND INCUR DAMAGE
TO OUR REPUTATION AND LIABILITY TO OUR CUSTOMERS

     Our products must work effectively with our customers' existing networks,
which typically include products from a variety of different vendors and utilize
multiple protocol standards. The complexity of these networks makes it difficult
for us to ensure that our products will function properly within these networks
and also makes it difficult for us to identify the source of any problems which
occur in the operation of our products. Despite testing by us and our customers,
our products may contain undetected software or hardware errors which result in
product failures or poor product performance. We have experienced such errors in
the past in connection with new products and product upgrades. We expect that
such errors will be found from time to time in new or enhanced products after we
have already shipped the products. If our products contain defects or fail to
work properly, we may:

     - suffer a loss of or delay in revenue;

     - incur additional expenses in our efforts to identify and remedy the
       problems;

     - suffer damage to our reputation; and

     - be exposed to damage claims by our customers.

     CLAIMS BY NORTEL NETWORKS OR OTHER COMPANIES THAT WE ARE INFRINGING THEIR
PROPRIETARY RIGHTS COULD HINDER OR BLOCK OUR ABILITY TO SELL OUR PRODUCTS,
SUBJECT US TO SIGNIFICANT MONETARY LIABILITY AND DIVERT THE TIME AND ATTENTION
OF OUR MANAGEMENT

     The broadband access equipment industry is characterized by the existence
of a large number of patents and frequent claims and related litigation
regarding patent and other intellectual property rights. In particular, leading
companies in the data communications and networking markets have extensive
patent portfolios with respect to networking technology. We recently received a
letter from Nortel Networks Corporation alleging that a specific feature of our
products infringes one of Nortel's patents relating to inverse multiplexing over
ATM. We believe that our products do not infringe the relevant Nortel patent and
we intend to contest this claim vigorously. However, we cannot assure you that
we will prevail in our objection to this claim or any other claim Nortel may
make with respect to other patents it owns, nor can we assure you that this
dispute will not result in litigation or that an adverse result or judgment will
not adversely affect our financial condition. The Nortel claim could be
time-consuming, result in costly litigation and diversion of technical and
management personnel, or require us to develop non-infringing technology. If
Nortel succeeds in its claim, we would need to enter into royalty or license
agreements. These royalty or license agreements, if required, may not be
available on acceptable terms, if at all.

     We expect that we may increasingly be subject to infringement claims as the
numbers of products and competitors in the market for broadband access equipment
grows and the functionality of products overlaps. If there is a successful claim
of infringement or if we fail to develop non-infringing technology or license
proprietary rights on a timely basis that may become necessary, our ability to
use technologies, products, and brand names may be limited and our business may
be harmed.

                                       10
<PAGE>   13

     OUR COMPETITIVE POSITION WOULD BE ADVERSELY AFFECTED IF WE WERE UNABLE TO
PROTECT OUR PROPRIETARY RIGHTS

     Our success and competitiveness are dependent to a significant degree on
the protection of our proprietary rights. We rely primarily on a combination of
copyrights, trademarks, trade secret laws and contractual restrictions and, to a
lesser extent, on patents to protect our proprietary rights. We have one U.S.
patent, and we have filed a corresponding application under the Patent
Cooperation Treaty relating to the management of tunneling protocols. There can
be no assurance that these patent applications will be approved, that any issued
patents will protect our intellectual property or that third parties will not
challenge them. We enter into confidentiality or license agreements with our
employees, consultants and corporate partners, and control access to and
distribution of our software, documentation and other proprietary information.
Despite these precautions, we cannot guarantee that the steps we have taken to
protect our proprietary rights will be adequate to deter misappropriation of our
intellectual property. Others may be able to copy or reverse engineer aspects of
our products, to obtain and use information that we regard as proprietary or to
independently develop similar technology. If we are unable to protect our
trademarks and other proprietary rights against unauthorized use by others, our
reputation and brand name may be damaged and our competitive position may be
significantly harmed.

     IF WE MAKE ACQUISITIONS OR STRATEGIC INVESTMENTS, OUR STOCKHOLDERS COULD BE
DILUTED, WE COULD INCUR ADDITIONAL DEBT, AND WE COULD ASSUME ADDITIONAL
CONTINGENT LIABILITIES

     We intend to consider investments in complementary companies, products or
technologies. While we have no current agreements to do so, we may buy
businesses, products or technologies in the future. If we make an acquisition or
investment, we may:

     - issue stock that would dilute your stock ownership;

     - incur debt which would restrict our cash flow;

     - assume liabilities which may result in additional costs;

     - incur amortization expenses related to goodwill and other intangible
       assets; or

     - incur large and immediate write-offs.

     WE MAY NOT BE ABLE TO SUCCESSFULLY INTEGRATE OR MANAGE THE ACQUISITIONS OR
INVESTMENTS WE MAKE

     We have not completed any acquisitions or investments to date, so, as a
company, we have no experience in this area. Therefore, acquisitions or
investments made by us could involve numerous risks, including:

     - problems combining the purchased operations, technologies or products;

     - unanticipated costs;

     - diversion of management's attention from our core business;

     - adverse effects on existing business relationships with suppliers and
       customers;

     - risks associated with entering markets in which we have no or limited
       prior experience; and

     - potential loss of key employees, particularly those of the purchased
       organizations.

     We may not be able to successfully integrate businesses, products,
technologies or personnel that we might acquire in the future. Any failure to do
so could disrupt our business and seriously harm our financial condition.

     WE MAY NEED ADDITIONAL CAPITAL TO FUND OUR OPERATIONS, WHICH MAY NOT BE
AVAILABLE

     At June 30, 2000, we had approximately $25.5 million in cash, cash
equivalents and marketable securities. We believe that these amounts, combined
with proceeds from this offering and cash anticipated to be available from
future operations, will enable us to meet our working capital and capital
expenditure requirements for at least the next 12 months. However, if cash from
available sources is insufficient, or if cash is used to acquire complementary
companies, products or technologies, or for other uses not presently planned, we
may need additional capital. The development and marketing of new and enhanced
products and the expansion of our sales channels and associated support
personnel will require a significant commitment of

                                       11
<PAGE>   14

resources. In addition, if the market for broadband access solutions develops at
a slower pace than anticipated or if we fail to establish significant market
share and achieve a meaningful level of revenue, we may continue to incur
significant operating losses and utilize significant amounts of capital. As a
result, we could be required to raise substantial additional capital. Additional
capital may not be available to us at all, or if available, may be available
only on unfavorable terms. Any inability to raise additional capital when we
require it would materially adversely affect our business, results of operations
and financial condition.

RISKS RELATED TO THE SECURITIES MARKETS AND THIS OFFERING

     STOCK MARKET VOLATILITY HAS INCREASED, MAKING YOUR INVESTMENT MORE RISKY

     The price at which our common stock will trade following this offering is
likely to be highly volatile and may fluctuate substantially. The price of the
common stock that will prevail in the market after this offering may be higher
or lower than the price you pay, depending on many factors, some of which are
beyond our control. In particular, given the limited amount of our product sales
and our limited number of customers, the announcement of any significant
customer developments, awards or losses or of any significant partnerships or
acquisitions by us or our competitors could have a material adverse effect on
our stock price. In addition, the stock markets, particularly the Nasdaq
National Market, on which we expect our common stock to be listed, have
experienced extreme price and volume fluctuations. These fluctuations have
particularly affected the market prices of equity securities of technology
related companies and have often been unrelated or disproportionate to the
operating performance of those companies.

     THE SIGNIFICANT CONCENTRATION OF OWNERSHIP OF OUR COMMON STOCK WILL LIMIT
YOUR ABILITY TO INFLUENCE CORPORATE ACTIONS

     Immediately following this offering, our executive officers, directors and
their affiliates will together own approximately 71% of our outstanding common
stock. As a result, those stockholders, if they act together, will be able to
determine the outcome of the vote on any matter requiring stockholder approval,
including the election of directors and the approval of significant corporate
transactions. This concentration of ownership may have the effect of delaying,
preventing or deterring a change in control of our company, could deprive our
stockholders of an opportunity to receive a premium for their common stock as
part of a sale of our company and might affect the market price of our common
stock.

     SOME PROVISIONS OF OUR CHARTER AND BY-LAWS MAY DELAY OR PREVENT
TRANSACTIONS THAT MANY STOCKHOLDERS MAY FAVOR

     Some provisions of our certificate of incorporation and by-laws may have
the effect of delaying, discouraging, or preventing a merger or acquisition that
our stockholders may consider favorable, including transactions in which
stockholders might receive a premium for their shares. These provisions include:

     - authorization of the issuance of "blank check" preferred stock without
       the need for action by stockholders;

     - a classified board of directors with staggered three-year terms;

     - inability of stockholders to call special meetings of stockholders or act
       by written consent; and

     - advance notice requirements for proposing matters that can be acted on by
       stockholders at stockholder meetings.

     Some provisions of Delaware law may also discourage, delay or prevent
someone from acquiring us or merging with us. See "Description of
Securities -- Delaware Law and Certain Charter and By-Law Provisions;
Anti-Takeover Effects" on page 56 for more detailed information on these
provisions.

                                       12
<PAGE>   15

     SUBSTANTIAL FUTURE SALES OF OUR COMMON STOCK IN THE PUBLIC MARKET COULD
CAUSE THE MARKET PRICE OF OUR COMMON STOCK TO FALL

     Additional sales of our common stock in the public market after this
offering, or the perception that such sales could occur, could cause the market
price of our common stock to decline. Upon completion of this offering, we will
have 41,115,883 shares of common stock outstanding. See "Prospectus
Summary -- The Offering" on page 3 for a detailed discussion of shares included
and excluded from this number. The 6,250,000 shares sold in this offering will
be freely transferable without restriction or registration under the Securities
Act of 1933. Based on shares outstanding as of September 30, 2000, the remaining
shares of common stock outstanding after this offering will be available for
sale as follows:

<TABLE>
<CAPTION>
       DAYS AFTER DATE OF            APPROXIMATE SHARES
        THIS PROSPECTUS           ELIGIBLE FOR FUTURE SALE                       COMMENT
       ------------------         ------------------------                       -------
<S>                               <C>                        <C>
90 days after effectiveness.....             79,500          Eligible for sale under Rule 144 or Rule 701
180 days after effectiveness....         34,786,383          Eligible for sale upon expiration of lock-up
</TABLE>

     In addition, Morgan Stanley & Co. Incorporated may, in its sole discretion,
at any time without notice, release all or any portion of the shares subject to
the lock-up agreements, which would result in more shares being available for
sale in the public market at an earlier date. Sales of common stock by existing
stockholders in the public market, or the availability of these shares for sale,
could materially and adversely affect the market price of our common stock.

     In addition, as soon as practicable after the date of this prospectus, we
intend to file a registration statement on Form S-8 with the Securities and
Exchange Commission covering the shares of common stock reserved for issuance
under our stock option plans. Based on shares and options outstanding as of
September 30, 2000, approximately 4,736,755 shares of common stock will be
reserved for issuance under our stock option plans on the effective date of this
offering. On the date 180 days after the effective date of this offering, at
least 1,475,864 shares will be subject to immediately exercisable options, based
on options outstanding on September 30, 2000. Sales of a large number of these
shares could have an adverse effect on the market price for our common stock.

     After this offering, the holders of 20,738,045 shares of common stock,
including shares issuable upon exercise of warrants which will be outstanding
immediately after the consummation of this offering, will have certain rights
with respect to registration of such shares for sale to the public. If such
holders, by exercising their registration rights, cause a large number of
securities to be registered and sold in the public market, such sales could have
an adverse effect on the market price for our common stock. If we were to
include in a company-initiated registration statement shares held by these
holders pursuant to the exercise of their registration rights, these sales may
have an adverse effect on our ability to raise needed capital. See "Shares
Eligible for Future Sale" beginning on page 58 for further details regarding the
number of shares eligible for sale in the public market after this offering.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     This prospectus contains forward-looking statements that relate to future
events or our future financial performance. In some cases, you can identify
forward-looking statements by terminology such as "may," "will," "should,"
"expects," "plans," "anticipates," "believes," "estimates," "predicts,"
"intend," "potential" or "continue" or the negative of such terms or other
comparable terminology. These statements are only predictions. Although we
believe that the expectations reflected in the forward-looking statements are
reasonable, we cannot guarantee future results, levels of activity, performance
or achievements. Our actual results could differ materially from those
anticipated in these forward-looking statements as a result of various factors,
including the risks outlined under "Risk Factors" beginning on page 5 and
elsewhere in this prospectus.

                                       13
<PAGE>   16

                                USE OF PROCEEDS

     We estimate that our net proceeds from the sale of the 6,250,000 shares of
common stock we are offering at an initial public offering price of $15 per
share will be approximately $86.0 million, or $99.1 million if the underwriters
exercise their over-allotment option in full, after deducting underwriting
discounts and commissions, and after deducting our estimated offering expenses.

     The principal purposes of this offering are to obtain additional capital,
to create a public market for our common stock, and to enhance our ability to
acquire businesses, products or technologies through the use of our common
stock. We expect to use the net proceeds of this offering primarily to fund
operating losses and for working capital and other general corporate purposes,
including increased expenditures for research and development and sales and
marketing, as well as capital expenditures, to implement our business
strategies. In addition, we may use a portion of the net proceeds for the
acquisition of businesses, products and technologies that are complementary to
ours. However, we have no current plans, agreements or commitments and are not
currently engaged in any negotiations with respect to any acquisition.

     No specific amount has been allocated to any particular purpose. However,
we presently intend to use approximately $30.0 to $40.0 million to expand our
research and development efforts, approximately $25.0 to $35.0 million on sales
and marketing activities, and approximately $5.0 to $10.0 million for capital
expenditures. The amount we actually spend for any of the purposes above will
vary significantly depending on a number of factors, including competitive and
technological developments, the amount of cash used in our operations, the rate
of growth, if any, of our business, and the availability of appropriate
opportunities to acquire complementary businesses or technologies. Pending these
uses, we intend to invest the net proceeds of this offering in investment grade,
interest-bearing securities.

     Our management will have considerable discretion in the application of the
net proceeds of this offering and you will not have the opportunity, as part of
your investment decision, to assess whether the proceeds are being used
appropriately. The net proceeds may be used for corporate purposes that do not
increase our profitability or our market value. Pending application of the
proceeds, they may be placed in investments that lose value.

                                DIVIDEND POLICY

     We have never paid or declared cash dividends on our common stock or other
securities and do not anticipate paying cash dividends in the foreseeable
future. Any future determination to pay cash dividends will be at the discretion
of our board of directors and will be dependent upon our financial condition,
results of operations, capital requirements, general business condition and any
other factors that the board may deem relevant.

                                       14
<PAGE>   17

                                 CAPITALIZATION

     The following table shows our capitalization as of June 30, 2000:

     - on an actual basis;

     - on a pro forma basis to reflect the conversion of all outstanding shares
       of preferred stock into 22,651,937 shares of common stock; and

     - on a pro forma as adjusted basis to reflect the sale of 6,250,000 shares
       of common stock in this offering and the application of the estimated net
       proceeds of $86.0 million, after deducting underwriting discounts and
       commissions and our estimated offering expenses.

     The outstanding share information excludes (1) 4,188,782 shares of common
stock issuable upon the exercise of options outstanding as of June 30, 2000 with
a weighted average exercise price of $2.11 per share, (2) 347,000 shares of
common stock issuable upon the exercise of warrants outstanding as of June 30,
2000 with a weighted average exercise price of $10.52 per share, and (3) 90,468
shares of common stock reserved for additional option grants under our stock
option plans as of June 30, 2000 and (4) additional shares of common stock
issuable upon conversion of outstanding preferred stock in respect of dividends
accruing after June 30, 2000. You should read this table together with our
financial statements and related notes, "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and "Use of Proceeds" appearing
elsewhere in this prospectus.

<TABLE>
<CAPTION>
                                                                     AS OF JUNE 30, 2000
                                                              ----------------------------------
                                                                                      PRO FORMA
                                                               ACTUAL    PRO FORMA   AS ADJUSTED
                                                              --------   ---------   -----------
                                                              (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                           <C>        <C>         <C>
Long-term debt, less current portion........................  $     37   $     37     $     37
Redeemable convertible preferred stock $.01 par value;
  actual -- 8,977,984 shares authorized, 8,755,920 shares
  issued and outstanding; pro forma and pro forma as
  adjusted -- no shares authorized, issued or outstanding...    58,383         --           --
Stockholders' equity (deficit):
Preferred stock, $.01 par value; actual -- 1,022,016 shares
  authorized, no shares issued or outstanding; pro forma and
  pro forma as adjusted -- 10,000,000 shares authorized, no
  shares issued or outstanding..............................
Common stock, $.0025 par value; actual -- 37,908,000 shares
  authorized, 11,688,750 shares issued and outstanding, pro
  forma -- 37,908,000 authorized, 34,340,687 shares issued
  and outstanding; pro forma as adjusted -- 250,000,000
  shares authorized, 40,590,687 issued and outstanding......        30         86          101
Additional paid-in capital..................................     7,682     66,009      151,982
Accumulated deficit.........................................   (25,634)   (25,634)     (25,634)
Treasury stock..............................................      (200)      (200)        (200)
Deferred stock compensation.................................    (7,212)    (7,212)      (7,212)
Accumulated comprehensive loss..............................       (37)       (37)         (37)
                                                              --------   --------     --------
     Total stockholders' equity (deficit)...................   (25,371)  $ 33,012      119,000
                                                              --------   --------     --------
     Total capitalization...................................  $ 33,049                $119,037
                                                              ========                ========
</TABLE>

                                       15
<PAGE>   18

                                    DILUTION

     The pro forma net tangible book value of our common stock as of June 30,
2000, was approximately $33.0 million, or $0.96 per share of common stock. Pro
forma net tangible book value per share represents the amount of our total
tangible assets reduced by the amount of our total liabilities, divided by
34,340,687 shares of common stock outstanding after giving effect to the
conversion of all outstanding shares of preferred stock into shares of common
stock upon completion of this offering. After giving effect to our sale of
6,250,000 shares of common stock in this offering at an initial offering price
of $15 per share and after deducting the estimated underwriting discounts and
commissions and our estimated offering expenses, our net tangible book value as
of June 30, 2000, would have been $119 million or $2.93 per share. This
represents an immediate increase in net tangible book value of $1.97 per share
to existing stockholders and an immediate dilution in net tangible book value of
$12.07 per share to purchasers of common stock in this offering, as illustrated
in the following table:

<TABLE>
<S>                                                           <C>        <C>
Public offering price per share.............................              $15.00
  Pro forma net tangible book value per share as of June 30,
     2000...................................................   $0.96
  Increase in pro forma net tangible book value per share
     attributable to new investors from this offering.......    1.97
                                                               -----
Pro forma net tangible book value per share after this
  offering..................................................                2.93
                                                                          ------
Dilution per share to new investors.........................              $12.07
                                                                          ======
</TABLE>

     The following table sets forth on a pro forma basis, as of June 30, 2000,
the number of shares of common stock purchased from us, the total consideration
paid or to be paid to us, and the average price per share paid or to be paid by
existing stockholders and by new investors, before deducting underwriting
discounts and commissions and estimated offering expenses payable by us:

<TABLE>
<CAPTION>
                                       SHARES PURCHASED      TOTAL CONSIDERATION      AVERAGE
                                     --------------------   ----------------------   PRICE PER
                                       NUMBER     PERCENT      AMOUNT      PERCENT     SHARE
                                     ----------   -------   ------------   -------   ---------
<S>                                  <C>          <C>       <C>            <C>       <C>
Existing stockholders..............  34,340,687     84.6%   $ 56,908,800     37.8%    $ 1.66
New investors......................   6,250,000     15.4      93,750,000     62.2      15.00
                                     ----------    -----    ------------    -----     ------
          Total....................  40,590,687    100.0%   $150,658,800    100.0%    $ 3.71
                                     ==========    =====    ============    =====     ======
</TABLE>

     The table above excludes (1) 4,188,782 shares of common stock issuable upon
the exercise of options outstanding as of June 30, 2000 with a weighted average
exercise price of $2.11 per share, (2) 347,000 shares of common stock issuable
upon the exercise of warrants outstanding as of June 30, 2000 with a weighted
average exercise price of $10.52 per share, (3) 90,468 shares of common stock
reserved for additional option grants under our stock option plans as of June
30, 2000 and (4) additional shares of common stock issuable upon conversion of
our outstanding preferred stock in respect of dividends accruing after June 30,
2000. To the extent outstanding options or warrants are exercised, there will be
further dilution to new investors. See "Management -- Stock Option Plans" on
page 45 and note 9 to our financial statements.

                                       16
<PAGE>   19

                            SELECTED FINANCIAL DATA

     You should read the following selected financial data in conjunction with
our financial statements and related notes and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included elsewhere in
this prospectus. The statement of operations data for the period from September
10, 1997 (inception) through December 31, 1997 and for the years ended December
31, 1998 and 1999, and the balance sheet data at December 31, 1998 and 1999 are
derived from audited financial statements included elsewhere in this prospectus.
The statement of operations data for the six months ended June 30, 1999 and 2000
and the balance sheet data at June 30, 2000 are derived from unaudited financial
statements included elsewhere in this prospectus. In the opinion of management,
these statements have been prepared on the same basis as the audited financial
statements and include all adjustments, consisting only of normal recurring
adjustments, necessary for the fair statement of the results for these periods.
Historical results are not necessarily indicative of results that may be
expected for any future period. The balance sheet data at December 31, 1997 is
derived from audited financial statements not included in this prospectus.

<TABLE>
<CAPTION>
                                            PERIOD FROM
                                             INCEPTION
                                           (SEPTEMBER 10,
                                               1997)            YEAR ENDED        SIX MONTHS ENDED
                                              THROUGH          DECEMBER 31,           JUNE 30,
                                            DECEMBER 31,    ------------------   -------------------
                                                1997         1998       1999       1999       2000
                                           --------------   -------   --------   --------   --------
                                                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                        <C>              <C>       <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenue..................................      $       --   $    --   $  4,278   $    402   $ 12,933
Cost of revenue..........................              --        --      2,839        337      9,556
                                               ----------   -------   --------   --------   --------
Gross profit.............................              --        --      1,439         65      3,377
Operating expenses:
  Research and development, excluding
     stock compensation amortization
     amounts(1)..........................             111     3,717      6,718      3,021      5,528
  Sales and marketing, excluding stock
     compensation amortization
     amounts(1)..........................              73       799      3,209      1,292      6,543
  General and administrative, excluding
     stock compensation amortization
     amounts(1)..........................             125       611      1,251        484        961
  Amortization of stock
     compensation(1).....................              --        --         42         --        491
                                               ----------   -------   --------   --------   --------
          Total operating expenses.......             309     5,127     11,220      4,797     13,523
                                               ----------   -------   --------   --------   --------
Loss from operations.....................            (309)   (5,127)    (9,781)    (4,732)   (10,146)
                                               ----------   -------   --------   --------   --------
Other income, net........................              16        16        452         92      1,056
                                               ----------   -------   --------   --------   --------
Net loss.................................            (293)   (5,111)    (9,329)    (4,640)    (9,090)
Accretion of transaction costs and
  accrued dividends on redeemable
  convertible preferred stock............              --      (367)    (2,589)      (482)    (2,815)
                                               ----------   -------   --------   --------   --------
Net loss applicable to common
  shareholders...........................      $     (293)  $(5,478)  $(11,918)  $ (5,122)  $(11,905)
                                               ==========   =======   ========   ========   ========
Basic and diluted net loss per share.....      $    (0.05)  $ (0.48)  $  (1.01)  $  (0.43)  $  (1.03)
                                               ==========   =======   ========   ========   ========
Shares used in computing net loss per
  share..................................           5,742    11,389     11,789     11,958     11,601
                                               ==========   =======   ========   ========   ========
Pro forma basic and diluted net loss per
  share(2)...............................                             $  (0.38)             $  (0.28)
                                                                      ========              ========
Shares used in computing pro forma basic
  and diluted net loss per share(2)......                               24,251                32,462
                                                                      ========              ========
</TABLE>

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

<TABLE>
<S>                                        <C>              <C>       <C>        <C>        <C>
(1) AMORTIZATION OF STOCK COMPENSATION AMOUNTS:
    Research and development.............      $       --   $    --   $      5   $     --   $    207
    Sales and marketing..................              --        --         35         --        233
    General and administrative...........              --        --          2         --         51
                                               ----------   -------   --------   --------   --------
                                               $       --   $    --   $     42   $     --   $    491
                                               ==========   =======   ========   ========   ========
</TABLE>

(2) Pro forma net loss per share for the year ended December 31, 1999 and the
    six months ended June 30, 2000 is computed using the weighted average number
    of common shares outstanding, including the pro forma effects of the
    automatic conversion of our outstanding preferred stock into shares of
    common stock effective upon the completion of this offering as if such
    conversion occurred on January 1, 1999, or at date of original issuance, if
    later.

                                       17
<PAGE>   20

<TABLE>
<CAPTION>
                                                         AS OF DECEMBER 31,
                                             ------------------------------------------   AS OF JUNE 30,
                                                 1997           1998           1999            2000
                                             ------------   ------------   ------------   ---------------
                                                                    (IN THOUSANDS)
<S>                                          <C>            <C>            <C>            <C>
BALANCE SHEET DATA:
Cash and cash equivalents..................     $  98         $ 1,449        $33,012         $  5,464
Working capital............................        23           3,916         35,069           20,082
Total assets...............................       368           6,451         41,695           43,952
Long-term debt, less current portion.......       263             286             98               37
Redeemable convertible preferred stock.....        --          10,593         55,517           58,383
Total stockholders' deficit................      (122)         (5,478)       (17,475)         (25,371)
</TABLE>

                                       18
<PAGE>   21

          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS

     The following discussion and analysis of our financial condition and
results of operations should be read together with our financial statements and
related notes appearing elsewhere in this prospectus.

OVERVIEW

     We design and market a line of broadband access platforms to
telecommunications service providers. Our compact and software-configurable
products enable our customers to transmit voice, data and multimedia
communications traffic more rapidly and cost-effectively while preserving their
investments in existing communications systems.

     From our inception in September 1997 through the fourth quarter of 1998, we
were a development stage company and had no revenue and our operating activities
related primarily to research and development, developing and testing prototype
products, building our technical support infrastructure, staffing our marketing,
sales and customer service organizations, and establishing relationships with
suppliers, manufacturers and potential customers. We commenced shipments of our
products in the first quarter of 1999. Since our inception, we have incurred
significant losses, and as of June 30, 2000, we had an accumulated deficit of
$25.6 million.

     We derive our revenue from sales of our line of broadband access platforms.
We generally recognize revenue from product sales upon shipment provided that a
purchase order has been received or a contract has been executed, there are no
significant uncertainties regarding customer acceptance, the fee is fixed and
determinable and collectibility is deemed probable. If our arrangement with the
customer includes obtaining customer acceptance, revenue is recognized when
customer acceptance has been received.

     We market and sell our products primarily through a direct sales and
marketing organization and, to a lesser extent through resellers and original
equipment manufacturers. We depend on a relatively small number of customers for
a large percentage of our revenue in any particular quarter. For the year ended
December 31, 1999, 2nd Century Communications and AccessLan accounted for 22%
and 53% of our revenue. These same customers accounted for 11% and 10% of our
revenue for the six months ended June 30, 2000, while Broadband Office accounted
for 53% of our revenue for the six months ended June 30, 2000. While the level
of sales to any specific customer is anticipated to vary from period to period,
we expect that we will continue to have significant customer concentration in
the foreseeable future. In addition to the customer concentration we have
experienced, we have a lengthy sales cycle for our products, which may extend
for six months or more, and there is often a significant delay between the time
we incur expenses and the time we realize the related revenue. Moreover, we have
historically derived a significant portion of our revenue from sales that occur
near the end of a fiscal quarter. As a result, delays in anticipated sales are
more likely to result in a deferral of the associated revenue beyond the end of
a particular quarter, which could have a significant impact on our operating
results for that quarter.

     Despite increased revenues, we have not achieved profitability on a
quarterly or an annual basis, and anticipate that we will continue to incur net
losses. We expect to continue to incur significant sales and marketing, research
and development and general and administrative expenses and, as a result, we
will need to generate significant revenues to achieve and maintain
profitability.

     Our cost of revenue includes all costs associated with the production of
our products, including cost of materials, manufacturing and assembly costs paid
to contract manufacturers, manufacturing start-up expenses and manufacturing
personnel, including related overheads. Because we outsource our manufacturing
and assembly requirements, a significant portion of our manufacturing expenses
consist of payments to third-party contract manufacturers. Manufacturing
engineering and documentation controls are performed at our facility in Vienna,
Virginia. During the fourth quarter of 1999 and the first six months of 2000 we
engaged a new contract manufacturer, Benchmark Electronics, and modified our
manufacturing arrangements to increase the scope of activities outsourced. Prior
to that time, we retained responsibility for negotiating with various suppliers
and purchasing product components, and the responsibility of our manufacturer
was limited to

                                       19
<PAGE>   22

assembling and testing the products. Under our present turnkey arrangements, we
have outsourced a number of additional tasks for which we had previously been
responsible, including:

     - determining the supply of components necessary to build the product;

     - negotiating with, and ordering components from, suppliers; and

     - purchasing and maintaining an inventory of product components.

     Our gross margin for the fourth quarter of 1999 and the first six months of
2000 was negatively affected by:

     - increased manufacturing costs associated with (1) early production of one
       of our products, the A-1240, which at such time was our most complex
       product, and (2) the changes in our manufacturing process described
       above; and

     - strategic price reductions implemented to penetrate a high volume, high
       growth target market, which we believe will continue to account for a
       major portion of our revenue for the next few quarters.

     We expect that continued increases in production volumes and further
improvement in the design of the A-1240 will allow more efficient production of
the product and will continue to improve margins in comparison to the margins we
experienced in the first six months of 2000. We also expect our new
manufacturing arrangements to contribute to improved margins in the near future
as Benchmark becomes more familiar with our products and we begin to benefit
from additional purchasing power as a result of increases in production volume.
In addition, as our products gain acceptance in new target markets, we expect
our margins to benefit from reduced costs due to volume and product design
changes and from pricing changes.

     We believe that our gross margins will continue to be affected primarily by
the following factors:

     - price declines as a result of competitive pressures, increased sales
       discounts, new product introductions by our competitors, or other factors
       without corresponding cost reductions;

     - the mix of sales channels through which our products and services are
       sold, as we generally realize higher gross margin on direct sales, in
       particular since our expansion into international markets means we will
       rely more on sales to resellers and original equipment manufacturers;

     - the mix of product configurations sold, as the software options available
       to our customers generally have a higher gross margin than hardware
       components; and

     - the volume of manufacturing and the effect on manufacturing and component
       costs as we attempt to continue to manage the costs of necessary
       components and our arrangements with our contract manufacturers.

     Research and development expenses consist primarily of salaries and related
personnel costs, prototype costs and other costs related to the design,
development, testing and enhancement of our products. To date, we have expensed
our research and development costs as they were incurred. Several components of
our research and development effort require significant expenditures, the timing
of which can cause quarterly variability in our expenses. We incur significant
expenses in connection with the purchase of testing equipment for our products.
We believe that research and development is critical to our strategic product
development objectives and intend to enhance our technology to meet the changing
requirements of our customers. As a result, in the future, we expect our
research and development expenses to increase in absolute dollars, but decline
as a percentage of revenue.

     Sales and marketing expenses consist primarily of salaries and related
personnel costs, commissions, promotional, travel and other marketing expenses
and recruiting expenses. We intend to increase our direct sales efforts, expand
our operations internationally, hire additional sales and marketing personnel,
initiate additional marketing programs and establish sales offices in new
locations. As a result, in the future, we expect our sales and marketing
expenses to increase in absolute dollars, but decline as a percentage of
revenue.

                                       20
<PAGE>   23

     General and administrative expenses consist primarily of salaries and
related expenses for executive, finance, legal, facilities, human resources and
information technology personnel, recruiting expenses and professional fees. We
expect our general and administrative expenses to increase in absolute dollars
as we add personnel and incur additional costs related to the growth of our
business and our operation as a public company.

     Amortization of stock compensation represents the amortization of costs
incurred in connection with option grants whose exercise prices are below the
deemed fair value of our common stock at the date of grant. These costs are
amortized over the vesting period which represents the period to which the
employees' services related.

RECENT DEVELOPMENTS

     On October 3, 2000 we entered into a procurement agreement with Qwest
Communications Corporation. Under that agreement, Qwest has agreed to purchase
$24 million of our products through the end of 2001. The agreement also
contemplates possible additional purchases during 2002. The actual amount and
timing of purchases by Qwest are uncertain and depend on future product
developments and other factors, some of which are beyond our control. Qwest can
terminate the agreement if we fail to deliver our products as set forth in the
contract or if another person acquires 50% or more of Qwest's voting securities
or substantially all of its assets.

RESULTS OF OPERATIONS

     SIX MONTHS ENDED JUNE 30, 1999 AND 2000

     Revenue.  Our revenue increased by approximately $12.5 million, from
$402,000 for the six months ended June 30, 1999 to $12.9 million for the six
months ended June 30, 2000. This increase was due principally to an increase in
sales of our A-1000, A-2000 and A-1240 products to new customers.

     Cost of Revenue.  Cost of revenue increased by approximately $9.2 million,
from $337,000 for the six months ended June 30, 1999 to $9.6 million for the six
months ended June 30, 2000. Our gross margin increased from 16% to 26%,
primarily due to the significant increase in sales volume which exceeded the
growth in manufacturing overhead costs. The margin growth resulting from the
decrease in overhead costs as a percentage of revenue was partially offset by an
increase in the level of discounts granted to customers to penetrate a new
market segment and an increase in materials and assembly costs resulting from
changes in our manufacturing arrangements.

     Research and Development Expenses.  Our research and development expenses
increased by approximately $2.5 million, or 83%, from $3.0 million for the six
months ended June 30, 1999 to $5.5 million for the six months ended June 30,
2000, representing 63% and 41% of total operating expenses for the six months
ended June 30, 1999 and 2000, respectively. The increase was due principally to
an increase in the number of research and development personnel and related
costs associated with the development of new products such as the A-3010,
A-4000, A-5040 and the A-7010 and new features and functionality of the A-1000,
A-1240 and the A-2000.

     Sales and Marketing Expenses.  Our sales and marketing expenses increased
by approximately $5.3 million, or 406%, from $1.3 million for the six months
ended June 30, 1999 to $6.5 million for the six months ended June 30, 2000,
representing 27% and 48% of total operating expenses for the six months ended
June 30, 1999 and 2000, respectively. The increase was due principally to
warrant issuance costs of $3.0 million along with higher costs from the
following: the hiring of additional sales and marketing personnel, sales-based
commissions and marketing program costs including web development costs, trade
shows, advertising and product launch activities.

     Warrant issuance costs represent expenses incurred in connection with the
issuance of warrants to existing or potential customers. In March 2000, in
connection with the signing of a purchase agreement, we issued to Intermedia
Communications, Inc. a warrant to purchase 125,000 shares of our common stock at
an exercise price of $15.00 per share. Under the original warrant agreement, the
warrant vested and became

                                       21
<PAGE>   24

exercisable as product payments were made. In June 2000, we amended and restated
the warrant agreement to provide for immediate vesting of the warrant and to
permit Intermedia to exercise the warrant after seven years, or earlier
depending on the timing and amount of products purchased. We accounted for the
warrant as a cost of establishing a relationship with a potential customer and
recorded a one-time charge of $1.1 million in June 2000. We determined the cost
associated with the warrant under the Black-Scholes option pricing model using
the following assumptions: volatility of 70%; risk-free interest rate of 6.3%;
dividend rate of 0%; and term of seven years.

     In June 2000, in connection with the signing of a purchase agreement, we
issued to Broadband Office a warrant to purchase 222,000 shares of our common
stock at an exercise price of $8.00 per share. The warrant vests immediately and
is exercisable at any time over the next 36 months. We accounted for this
warrant as a cost of developing a long-term business relationship with this
customer. Therefore, in June 2000, we recognized a one-time charge of $1.9
million. The amount of the charge was determined using the Black-Scholes option
pricing model and the following assumptions: volatility of 70%; risk-free
interest rate of 6.0%; dividend rate of 0%; and term of three years.

     General and Administrative Expenses.  Our general and administrative
expenses increased by $477,000, or 99%, from $484,000 for the six months ended
June 30, 1999 to $961,000 for the six months ended June 30, 2000, representing
10% and 7% of total operating expenses for the six months ended June 30, 1999
and 2000, respectively. This increase was due to the hiring of additional
general and administrative personnel and increased expenses necessary to support
our growing operations.

     Other Income, Net.  Other income, net of expenses increased by $964,000, or
1048%, from $92,000 for the six months ended June 30, 1999 to $1.1 million for
the six months ended June 30, 2000. Other income, net consists of interest
earned on our cash balances and marketable securities and interest expense
associated with our bank debt. The increase in other income, net was primarily
due to higher interest income as a result of increases in invested balances
during 2000.

     Net Operating Loss Carryforwards.  As of June 30, 2000, we had
approximately $22.8 million of federal and state net operating loss
carryforwards for tax reporting purposes available to offset future taxable
income. See "-- Net Operating Loss Carryforwards" on page 24 below.

     YEARS ENDED DECEMBER 31, 1998 AND 1999

     Revenue.  We did not generate any revenue in 1998. In 1999 our revenue was
$4.3 million from sales of our A-1000, A-2000 and A-1240 products.

     Cost of Revenue.  We did not incur any cost of revenue in 1998. In 1999 our
cost of revenue was $2.8 million, and our gross margin was 34%.

     Research and Development Expenses.  Our research and development expenses
increased by approximately $3.0 million, or 81%, from $3.7 million in 1998 to
$6.7 million in 1999, representing 72% and 60% of total operating expenses for
1998 and 1999, respectively. The increase in research and development expenses
was due principally to an increase in the number of research and development
personnel and related costs associated with the development of the A-1000,
A-1240, A-2000, A-3010 and A-4000 products as well as enhancements to the
features and functionality of those products.

     Sales and Marketing Expenses.  Our sales and marketing expenses increased
by approximately $2.4 million, or 302%, from $799,000 in 1998 to $3.2 million in
1999, representing 16% and 29% of total operating expenses for 1998 and 1999,
respectively. The increase in sales and marketing expenses reflects the hiring
of additional sales and marketing personnel, sales based commissions and
marketing program costs including web development costs, trade shows,
advertising and product launch activities.

     General and Administrative Expenses.  Our general and administrative
expenses increased by approximately $640,000, or 105%, from $611,000 in 1998 to
$1.3 million in 1999, representing 12% and 11% of total operating expenses for
1998 and 1999, respectively. The increase was due to the hiring of additional
general and administrative personnel and expenses necessary to support our
growing operations.

                                       22
<PAGE>   25

     Other Income, Net.  Other income, net of expenses increased by
approximately $436,000 from $16,000 in 1998 to $452,000 in 1999. Other income,
net consists of interest earned on our cash balances and marketable securities
and interest expense associated with our bank debt. The increase in other
income, net was primarily due to higher interest income as a result of increases
in invested balances during 1999, partially offset by increased interest expense
on bank debt.

     Net Operating Loss Carryforwards.  As of December 31, 1999, we had
approximately $14.7 million of federal and state net operating loss
carryforwards for tax reporting purposes available to offset future taxable
income. See "-- Net Operating Loss Carryforwards" on page 24 below.

     INCEPTION THROUGH DECEMBER 31, 1997 AND YEAR ENDED DECEMBER 31, 1998

     From our inception in September 1997 through the end of 1998, we recognized
no revenue and incurred no cost of revenue. Our operating expenses were $309,000
for the period from inception through December 31, 1997. Our operating
activities during this period related primarily to research and development,
developing and testing prototype products, building our technical support
infrastructure, staffing our marketing, sales and customer service
organizations, and establishing relationships with suppliers, manufacturers and
potential customers. As a result, we believe that a discussion of our results of
operations for the period from inception through December 31, 1997 compared to
our results of operations for the year ended December 31, 1998 would not be
meaningful.

QUARTERLY RESULTS OF OPERATIONS

     The following table sets forth, for each of our last six quarters, selected
data from our statement of operations and such data as a percentage of revenue.
The information for each of these quarters is unaudited and has been prepared on
the same basis as the audited financial statements appearing elsewhere in this
prospectus. In the opinion of management, all necessary adjustments consisting
only of normal recurring adjustments have been included to present fairly the
unaudited quarterly results when read in conjunction with our audited financial
statements and the related notes appearing elsewhere in this prospectus. The
operating results for any quarter are not necessarily indicative of the results
of any future period.

<TABLE>
<CAPTION>
                                                               QUARTER ENDED
                                     ------------------------------------------------------------------
                                     MAR. 31,    JUNE 30,    SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,
                                       1999        1999        1999        1999       2000       2000
                                     ---------   ---------   ---------   --------   --------   --------
                                                           (DOLLARS IN THOUSANDS)
<S>                                  <C>         <C>         <C>         <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA:
Revenue............................    $   186     $   216    $ 1,201    $ 2,675    $ 4,994    $ 7,939
Cost of revenue....................        161         176        727      1,775      3,777      5,779
                                     ---------   ---------    -------    -------    -------    -------
  Gross profit.....................         25          40        474        900      1,217      2,160
Operating expenses:
  Research and development,
     excluding stock compensation
     amortization amounts(1).......      1,410       1,611      1,548      2,149      2,651      2,877
  Sales and marketing, excluding
     stock compensation
     amortization amounts(1).......        561         731        698      1,219      1,453      5,090
  General and administrative,
     excluding stock compensation
     amortization amounts(1).......        238         246        397        370        476        485
  Amortization of stock
     compensation(1)...............         --          --         --         42        129        362
                                     ---------   ---------    -------    -------    -------    -------
          Total operating
            expenses...............      2,209       2,588      2,643      3,780      4,709      8,814
                                     ---------   ---------    -------    -------    -------    -------
Loss from operations...............     (2,184)     (2,548)    (2,169)    (2,880)    (3,492)    (6,654)
Other income, net..................         75          17         19        341        604        452
                                     ---------   ---------    -------    -------    -------    -------
Net loss...........................    $(2,109)    $(2,531)   $(2,150)   $(2,539)   $(2,888)   $(6,202)
                                     =========   =========    =======    =======    =======    =======
</TABLE>

                                                         (footnote on next page)

                                       23
<PAGE>   26

<TABLE>
<CAPTION>
                                                               QUARTER ENDED
                                     ------------------------------------------------------------------
                                     MAR. 31,    JUNE 30,    SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,
                                       1999        1999        1999        1999       2000       2000
                                     ---------   ---------   ---------   --------   --------   --------
                                                           (DOLLARS IN THOUSANDS)
<S>                                  <C>         <C>         <C>         <C>        <C>        <C>
AS A PERCENTAGE OF REVENUE:
Revenue............................      100.0%      100.0%     100.0%     100.0%     100.0%     100.0%
Cost of revenue....................       86.6        81.5       60.5       66.4       75.6       72.8
                                     ---------   ---------    -------    -------    -------    -------
  Gross profit.....................       13.4        18.5       39.5       33.6       24.4       27.2
Operating expenses:
  Research and development,
     excluding stock compensation
     amortization amounts..........      758.1       745.8      128.9       80.3       53.1       36.2
  Sales and marketing, excluding
     stock compensation
     amortization amounts..........      301.6       338.4       58.1       45.6       29.1       64.1
  General and administrative,
     excluding stock compensation
     amortization amounts..........      128.0       113.9       33.1       13.8        9.5        6.1
  Amortization of stock
     compensation..................         --          --         --        1.6        2.6        4.6
                                     ---------   ---------    -------    -------    -------    -------
          Total operating
            expenses...............    1,187.7     1,198.1      220.1      141.3       94.3      111.0
                                     ---------   ---------    -------    -------    -------    -------
Loss from operations...............   (1,174.3)   (1,179.6)    (180.6)    (107.7)     (69.9)     (83.8)
Other income, net..................       40.3         7.9        1.6       12.7       12.1        5.7
                                     ---------   ---------    -------    -------    -------    -------
Net loss...........................   (1,134.0)%  (1,171.7)%   (179.0)%    (94.9)%    (57.8)%    (78.1)%
                                     =========   =========    =======    =======    =======    =======
</TABLE>

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

<TABLE>
<S>                                  <C>         <C>         <C>         <C>        <C>        <C>
(1) AMORTIZATION OF STOCK
     COMPENSATION AMOUNTS:
    Research and development.......  $      --   $      --    $    --    $     5    $    54    $   153
    Sales and marketing............         --          --         --         35         64        169
    General and administrative.....         --          --         --          2         11         40
                                     ---------   ---------    -------    -------    -------    -------
                                     $      --   $      --    $    --    $    42    $   129    $   362
                                     =========   =========    =======    =======    =======    =======
</TABLE>

     Our revenue and operating results may vary significantly from quarter to
quarter due to a number of factors, many of which are outside of our control and
any of which may cause our stock price to fluctuate. In addition, we plan to
increase significantly our operating expenses to fund greater levels of research
and development, expand our sales and marketing operations, broaden our customer
support capabilities and develop new distribution channels. We also plan to
expand our general and administrative capabilities to address the increased
reporting and other administrative demands which will result from becoming a
public company and the growth of our business. Our operating expenses are
largely based on anticipated organizational growth and revenue trends and a high
percentage of our expenses are, and will continue to be, fixed. As a result, any
delay in generating or recognizing revenue could cause significant variations in
our operating results from quarter to quarter and could result in substantial
operating losses. We believe that quarter-to-quarter comparisons of our
operating results are not a good indication of our future performance. You
should not rely on our results or growth for one quarter as any indication of
our future performance. In future quarters, if our operating results are below
the expectations of public market analysts and investors, the price of our
common stock will probably decrease.

NET OPERATING LOSS CARRYFORWARDS

     Our state and federal net operating loss carryforwards begin to expire in
2004 and 2012, respectively, to the extent that they are not used. We have not
recognized any benefit from the future use of loss carryforwards for these
periods, or for any other periods, since inception. Management's evaluation of
the available evidence in assessing realizability of the tax benefits of such
loss carryforwards indicates that the underlying assumptions of future
profitable operations contain risks that do not provide sufficient assurance to
recognize the tax benefits currently. The net operating loss carryforwards could
be limited in future years if there is a significant change in our ownership.

                                       24
<PAGE>   27

LIQUIDITY AND CAPITAL RESOURCES

     Since our inception, we have financed our operations through private sales
of securities and, to a lesser extent, bank borrowings and equipment lease
financing. We have raised an aggregate of $53.1 million, net of offering
expenses, through the sale of our capital stock.

     Net cash used in operating activities for the six months ended June 30,
2000 was $6.4 million. Net cash used in operating activities for the period from
inception through December 31, 1997 and for the years ended December 31, 1998
and 1999 was $126,000, $4.2 million and $12.7 million, respectively. Net cash
used in operating activities for each period consists primarily of the net loss
for the period as well as increases in accounts receivable and inventory for
both the year ended December 31, 1999 and the six months ended June 30, 2000.

     Net cash used in investing activities for the six months ended June 30,
2000 was $21.7 million. Net cash provided by investing activities for the year
ended December 31, 1999 was $2.2 million. Net cash used in investing activities
was $275,000 for the period from inception through December 31, 1997 and $4.9
million for the year ended December 31, 1998. Net cash used in investing
activities for all periods consisted primarily of purchases of marketable
securities as well as purchases of property and equipment. Net cash provided by
investing activities consisted of proceeds from the sale of marketable
securities.

     Net cash provided by financing activities for the three months ended June
30, 2000 was $604,000. Net cash provided by financing activities for the period
from inception through December 31, 1997 and for the years ended December 31,
1998 and 1999 was $499,000, $10.5 million and $42.0 million, respectively. For
each period, the net cash provided by financing activities consists primarily of
proceeds from the issuance of our capital stock.

     We have no material commitments other than obligations under our credit
facilities and both operating and capital leases.

     As of June 30, 2000, our principal source of liquidity consisted of $25.5
million in cash, cash equivalents and marketable securities. Our management
intends to invest our cash in excess of current operating requirements in
short-term, interest-bearing, investment-grade securities. The development and
marketing of new and enhanced products and the expansion of our sales channels
and associated support personnel will require a significant commitment of
resources. Our future capital requirements will depend upon a number of factors,
including the rate of growth of our sales, the timing and level of research and
development activities and sales and marketing campaigns. As of June 30, 2000,
we did not have any material commitments for capital expenditures. However, we
expect to incur capital expenditures as we expand our operations in the near
future. Although we do not have any current plans or commitments to do so, from
time to time, we may also consider the acquisition of, or evaluate investments
in, products and businesses complementary to our business. Any acquisition or
investment may require additional capital.

     Although it is difficult for us to predict future liquidity requirements
with certainty, we believe that the net proceeds from this offering, together
with our current cash, cash equivalents and marketable securities will be
sufficient to meet our anticipated cash needs for working capital and capital
expenditures for at least the next 12 months. We may require additional capital
to fund our business if we seek to acquire complementary companies, products or
technologies, or for other uses not presently planned. In addition, if the
market for broadband access equipment develops at a slower pace than anticipated
or if we fail to establish significant market share and achieve a meaningful
level of revenue, we may continue to incur significant operating losses and
utilize significant amounts of capital. As a result, we could be required to
raise substantial additional capital. If cash from other available sources is
insufficient to satisfy our liquidity requirements, we may seek to sell
additional equity or debt securities. If additional funds are raised through the
issuance of debt securities, these securities could have rights, preferences and
privileges senior to holders of common stock, and the terms of this debt could
impose restrictions on our operations and cause us to incur significant interest
expense. The sale of additional equity or convertible debt securities could
result in additional dilution to our stockholders. Additional capital may not be
available to us at all, or if available, may be available only on unfavorable
terms. Any inability to raise additional capital when we require it would
materially adversely affect our business, results of operations and financial
condition.

                                       25
<PAGE>   28

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     As of June 30, 2000, we had investments in marketable securities of $20.1
million. All of these securities consisted of highly liquid investments. Of the
total, $11.2 million was for marketable securities with remaining maturities at
the date of purchase of less than 365 days, the balance of the securities or
$8.9 million had remaining maturities at the date of purchase of 365 days or
greater. These investments are subject to interest rate risk and will decrease
in value if market interest rates increase. A hypothetical increase or decrease
in market interest rates by 10% from the June 30, 2000 rates would not cause a
material change in the fair value of these short-term investments. We have the
ability to hold these investments until maturity, and therefore we do not expect
the value of these investments to be affected to any significant degree by the
effect of a sudden change in market interest rates. Declines in interest rates
over time will, however, reduce our interest income.

     As of June 30, 2000, we did not own any equity investments. Therefore, we
did not have any material equity price risk.

     Substantially all of our revenue is currently realized in U.S. dollars. In
addition, we do not maintain significant asset or cash account balances in
currencies other than the United States dollar. Therefore, we do not believe
that we currently have any significant direct foreign currency exchange rate
risk. In the future, a portion of our international sales may be denominated in
currencies other than U.S. dollars, which would then expose us to gains and
losses based upon exchange rate fluctuations.

RECENT ACCOUNTING PRONOUNCEMENTS

     In March 1998, the American Institute of Certified Public Accountants, or
AICPA, issued Statement of Position, or SOP, No. 98-1, Accounting for the Costs
of Computer Software Developed or Obtained for Internal Use. SOP No. 98-1
requires that entities capitalize costs related to internal-use software. We
were required to implement SOP No. 98-1 for the year ended December 31, 1999.
The adoption of SOP No. 98-1 did not have a material impact on our financial
position, results of operations or cash flows.

     In April 1998, the AICPA issued SOP No. 98-5, Reporting on the Costs of
Start-Up Activities. SOP No. 98-5 requires that all start-up costs related to
new operations must be expensed as incurred. In addition, SOP No. 98-5 requires
that all start-up costs that were capitalized in the past must be written off.
We were required to implement SOP 98-5 for the year ended December 31, 1999. The
adoption of SOP No. 98-5 did not have a material impact on our financial
position, results of operations or cash flows.

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards, or SFAS, No. 133, Accounting for Derivative
Instruments and Hedging Activities. SFAS No. 133 establishes methods of
accounting for derivative financial instruments and hedging activities related
to those instruments as well as other hedging activities. Because we currently
hold no derivative instruments and do not engage in hedging activities, we
expect that the adoption of SFAS No. 133 will not have a material impact on our
financial position, results of operations or cash flows. We will be required to
implement SFAS No. 133 for the year ending December 31, 2001.

     In December 1999, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 101, or SAB 101. This summarizes certain areas of the
Staff's views in applying generally accepted accounting principles to revenue
recognition in financial statements. We believe that our current revenue
recognition principles comply with SAB 101.

     In March 2000, the Financial Accounting Standards Board issued FASB
Interpretation No. 44, "Accounting for Certain Transactions Involving Stock
Compensation, an Interpretation of APB Opinion No. 25." This interpretation is
generally effective for applicable transactions beginning July 1, 2000. We do
not expect this interpretation to have a material impact on our financial
statements.

                                       26
<PAGE>   29

                                    BUSINESS

OVERVIEW

     Advanced Switching Communications, Inc. designs and markets a line of
broadband access platforms to telecommunications service providers. Our compact
and software-configurable products enable our customers to transmit voice, data
and multimedia communications traffic more rapidly and cost-effectively while
preserving their investments in existing communications systems. Our products
are deployed at central offices, points of presence or multi-tenant office
buildings that comprise the entry points to a service provider's access network.
By extending the benefits of packet technology beyond the network core, our
products reduce transmission and operating costs, increase the efficiency of
core network equipment, provide access to fiber optic core networks and allow
our customers to develop networks for broadband services. We market our products
to telecommunications service providers worldwide, focusing on established as
well as emerging carriers, multi-tenant unit service providers and digital
subscriber line service providers.

INDUSTRY BACKGROUND

     INTERNET AND DEREGULATION DRIVING DATA TRAFFIC AND CLEC GROWTH

     Growth in broadband applications, such as Internet access, electronic
commerce, business usage of web-based communications, remote access for
teleworkers, application hosting and other services has generated enormous
growth in data traffic. This explosion of data traffic, coupled with existing
demand for voice traffic, is placing significant strains on the existing network
infrastructure. Meanwhile, worldwide deregulation of the telecommunications
industry has resulted in the emergence of new service providers who are building
advanced packet-based networks, which transport voice and data in small bundles,
or "packets." These networks use available network bandwidth more efficiently
than traditional circuit-switched telephone networks, which were designed for
voice traffic and built long before the advent of the Internet. Packet-based
networks offer a highly flexible, cost-effective and efficient means to provide
communications services, including data, voice and multimedia, and are
undergoing rapid expansion. In the United States, for example, the Association
for Local Telecommunications Services estimates in its year 2000 annual report
that more than 300 new competitive local exchange carriers, or CLECs, have
emerged since the passage of the Telecommunications Act of 1996 and are
investing, on average, over $1 billion per month in the aggregate on their
networks. In general, these competitive service providers seek to capture
opportunities in markets that larger incumbent service providers have generally
ignored, including small to medium sized-businesses and lower population density
markets. In response to deregulation and increased competition, incumbent
service providers worldwide are seeking to upgrade their existing networks to
enable them to provide broadband services that are comparable to the offerings
of competitive service providers. As a result, both incumbent and competitive
service providers are aggressively pursuing equipment solutions that allow them
to offer broadband services while capitalizing on their investment in existing
network infrastructure.

     LIMITATIONS OF EXISTING LOCAL ACCESS NETWORKS

     Telecommunications service providers typically situate high-speed packet
transmission equipment at the core or backbone of their networks, but rely on
voice-oriented technology for their access networks. Local access networks are
comprised of a system of central offices, facilities that serve as staging areas
for the delivery of telecom services to the end user. Commonly known as the
"last mile," access networks generally still use the copper infrastructure
originally built to transmit voice signals using technology known as analog. As
a result of the technological constraints of voice-oriented technology, existing
access network architectures consist of separate voice and data networks that
operate with different transmission protocols. These multiple or overlay
networks are unable to efficiently satisfy the demand for enhanced services.
While the bandwidth capabilities of local area networks (at customer premises)
and fiber-based core networks have dramatically

                                       27
<PAGE>   30

increased, the access networks that link the two have not kept pace. Existing
access equipment alternatives do not adequately meet the needs of service
providers because:

     - Traditional access equipment does not support broadband services.

     - Existing packet-based solutions, known as edge switching equipment, that
       do support broadband services are generally large, inflexible and costly
       adaptations of core network products that are difficult to install,
       operate and upgrade.

We believe that the size of the market for the type of access equipment
described above is best characterized by the edge aggregation market estimates
of RHK, a market research and consulting firm. According to RHK, the market for
edge aggregation is forecasted to grow from $3.7 billion in 1999 to between
$14.1 billion and $16.3 billion in 2003, a compound annual growth rate of
between 39% and 44%.

     ACCESS EQUIPMENT REQUIREMENTS FOR BROADBAND SERVICE PROVIDERS

     Deregulation and increased competition are forcing service providers to
invest in equipment that accelerates the delivery of broadband services to
customers. Service providers must reduce time-to-market, offer significant cost
advantages and provide differentiated and expanded service offerings in order to
win customers and gain market share. As a result, today's service providers
require multi-service access equipment with the following characteristics:

     - Scalability.  With demand for broadband services growing rapidly across
       all market segments, service providers need equipment suitable for all of
       their markets. In order for service providers to grow their customer base
       and increase the breadth and number of available service offerings, this
       equipment must scale in a linear fashion regardless of customer density.

     - Multi-Service Support.  Today's networks carry multiple transmission
       types or protocols, including frame relay, asynchronous transfer mode, or
       ATM, Internet protocol, and time division multiplexing, or TDM. Global
       multi-billion dollar service markets have been built around each of these
       protocols. Service providers require a solution that adapts these
       multiple access protocols to a single packet-based network. A unified
       solution can dramatically streamline provisioning, create structural cost
       advantages and simplify network architectures.

     - Cost Effectiveness.  Service providers seek equipment with low initial
       cost that will allow them to build their networks rapidly and target
       customers and markets that may otherwise go unserved. In addition, widely
       deployed equipment must allow service providers to maintain low operating
       costs by minimizing the time and expense involved in provisioning and
       upgrading services.

     - Space and Other Physical Requirements.  The demand for broadband services
       is causing service providers to extend their networks closer to their
       customers in larger numbers of central offices, points of presence and
       new locations, such as basements of multi-tenant units. Space in these
       locations is limited and expensive and may have insufficient power and
       cooling capacity necessary to operate traditional networking equipment.
       Equipment deployed at these sites must be compact and must have minimal
       power and cooling requirements. However, this equipment must also comply
       with the rigorous industry standards established for central office
       equipment.

     - Interoperability with Existing Systems.  Service providers require
       equipment that operates in conjunction with the exacting standards of
       today's carrier network systems and preserves the value of their existing
       networks. In addition, they seek a network architecture that is not
       easily disrupted and that will maximize the performance of their core
       network equipment, such as switches and routers.

     - Rapid Provisioning and Response Times.  Competitors in today's
       telecommunications market are racing to expand their networks and
       increase their market share. Service providers require a solution that
       enables them to rapidly offer reliable integrated services on a wide
       scale. Once deployed, their equipment must support quick response times
       to end-user requests. Moreover, service providers need equipment that can
       be configured from a remote terminal so that they can avoid sending a
       technician to physically modify the equipment to add or change a
       customer's service.

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<PAGE>   31

THE ASC SOLUTION

     Our product line is focused exclusively on providing solutions at the local
access network level and enabling our customers to extend the high-speed
benefits of packet technology from their typically optical core networks into
local access applications. We have designed our product line to meet the
protocol flexibility, price-point, scalability and interoperability requirements
of broadband service providers worldwide. Our innovative products are easily
integrated into the access network architecture and offer the following benefits
and features:

     - Enhanced Revenue Opportunities.  Our product design and multi-service
       capabilities help service providers generate additional revenue by
       penetrating new markets and expanding the types of services and variety
       of service packages they can offer and allowing them to provision
       services more rapidly. The relatively low initial investment required to
       deploy our equipment enables service providers to increase revenue growth
       by rapidly building and expanding their network.

     - Highly Scalable Product Architecture.  Our products are designed to
       proportionally meet our customers' network requirements. In small
       markets, a customer can deploy services with a single card in a stackable
       platform and add platforms as demand grows. In large markets, customers
       can deploy our multiple card system using the same individual cards from
       the stackable platforms. Our scalable product architecture allows service
       providers to target small and medium sized markets that are prohibitively
       expensive to service using other, less scalable technologies.

     - Multi-Service Capabilities.  Our products' ports, which transmit and
       receive data to and from physical access lines, are individually software
       configurable to support various transmission protocols, including frame
       relay, ATM, and TDM (for voice). Our products also support enhancements
       to frame relay and ATM, known as multi-link frame relay and inverse
       multi-plexing over ATM, respectively, that allow service providers to use
       existing network capacity more efficiently and provide new broadband
       services. By converting these protocols into a single network protocol,
       we can significantly simplify a service provider's core network. In
       addition, new protocols can be added through software instead of
       hardware. Our software-configurable ports eliminate the need for service
       providers to predetermine the number of ports dedicated to each specific
       protocol or service. Service providers that use our products can remotely
       configure ports for new services as end users request them. In addition,
       a service provider can change a customer's service using software, with
       minimal service disruption and without dispatching personnel to
       physically change a customer's connection.

     - Reduced Operating Costs.  Our products convert different end-user
       services to a single format or protocol for transmission to the core
       network, eliminating the need to deploy multiple core networks, one for
       each service offered. Our products also aggregate the local access lines
       that carry these services into fewer high-speed optical or electrical
       connections to the core network, allowing core network equipment to
       operate more efficiently. This service conversion and access line
       aggregation reduces the costs of building and operating a service
       provider network. Additionally, converging access services into a single
       network protocol eliminates the complexity and expense of deploying
       multiple overlay networks for each protocol or service offered.

     - Interoperability with Existing Systems.  Since our products operate with
       all leading core network components, service providers can preserve and
       leverage the value of their existing investments. Our products utilize
       industry standard protocols and have built-in software flexibility to add
       new protocols as they are adopted and standardized in the marketplace.

     - Space and Physical Design Advantages.  The compact design and high port
       density of our equipment means that it occupies minimal space at central
       offices, multi-tenant office buildings, or other points of presence. In
       addition, the lower power requirements and the low heat output of our
       products allow service providers to deploy services to locations
       previously excluded from the network because of the physical limitations
       of the space. Finally, our products comply with Network Equipment
       Building System, or NEBS, level 3 standards, the most stringent network
       facility standard set forth by Bellcore

                                       29
<PAGE>   32

       for central office equipment. This means that they can be deployed in
       virtually any central office in a service provider's network.

STRATEGY

     Our objective is to become a leading provider of broadband access platforms
that enable service providers worldwide to provide integrated voice, data and
multimedia broadband services. To achieve our objective, we enable service
providers to continue building high-speed networks that extend packet technology
outward from the network core to the access network and thereby eliminate the
need for and added cost of operating multiple single-protocol networks. Key
elements of our strategy include:

     Broaden Customer Base Domestically and Internationally.  We have won
strategic customer accounts in three market segments: next-generation carriers,
multi-tenant unit service providers and digital subscriber line service
providers. We plan to leverage this success to generate increased sales by
focusing global sales efforts on these key segments, publicizing early wins and
developing marketing materials and campaigns targeted at these segments. For
example, many next-generation carriers are positioning themselves to offer
integrated voice-data-multimedia services over a single network infrastructure,
while some are expanding and extending their packet-based networks to satisfy
customers' bandwidth and networking demands. We intend to capitalize on these
developments and broaden our focus by targeting groups within incumbent local
exchange carriers (ILECs), interexchange carriers, post telephone and telegraph
organizations abroad and other types of service providers building packet-based
networks.

     Leverage Technology Leadership from Access into Core.  We believe we have
established a technology leadership position in the market for broadband access
platforms. Our broadband access platforms are designed for deployment in
hundreds or thousands of points of presence, central offices or multi-tenant
office buildings within a service provider's network. Once our products are
installed in a service provider's network, we can simplify its network
architecture and operations. To address evolving network needs, we will continue
to extend the capabilities of our product by leveraging our unique
software-upgradeable design to support new protocols, greater numbers of
end-users and higher speed optical connections, as well as enhanced switching
capabilities. Moreover, as we add new features and products, our solutions will
gradually assume more functionality previously relegated to core platforms,
extending our platforms into the core of service provider networks.

     Provide Customers with a Smooth Migration Path to a New Generation of
Networks.  Our product line is designed to support the current infrastructures
and services in the market with a software-based architecture that supports new
protocols and services without major hardware changes. Today, the predominant
network protocol used to provide integrated multi-protocol services is ATM. We
plan to leverage our flexible architecture to allow our customers to rapidly
capture market share using ATM as a network protocol and cost-effectively evolve
their networks to support the Internet protocol and optical-based services of
the future.

     Expand Our Global Sales Efforts and Our Customer Service and Support
Capabilities.  We primarily sell our products through our direct sales force. We
plan to expand our direct sales force domestically and internationally,
including expansion in Europe, Asia and Latin America which represented an
aggregate of 10% of our revenue in 1999. To support our direct sales efforts, we
will continue to develop relationships with multiple distribution partners,
systems integrators, resellers and original equipment manufacturers to help
build acceptance of our products. We plan to complement our product line by
expanding our professional service and support organization designed to ensure
effective product implementations and high levels of customer satisfaction.

     Continue to Outsource Product Manufacturing.  Our manufacturing strategy is
based on the use of one or more contract manufacturers for the assembling,
testing, packaging, warehousing and shipping of our products. By continuing to
outsource the manufacturing of our products, we can continue to focus our
resources on product design and development, and executing sales and marketing
initiatives. In addition, outsourcing allows us to achieve economies of scale in
operating and purchasing while reducing the significant capital investments
required for manufacturing equipment and inventory management. Currently, we use
one primary contract manufacturer, Benchmark Electronics.

                                       30
<PAGE>   33

PRODUCTS

     Our product family of broadband access platforms includes the A-1000,
A-2000, A-1240, A-3010 and A-4000. Our unique, scalable architecture provides
cost effective access solutions at a variety of port densities, large or small.
Each of our compact, stackable platforms, the A-1000, the A-2000, the A-1240,
and the A-3010 operates as a complete stand-alone system or as a card, or
component, in the A-4000, which contains 18 slots to house these individual
cards. The following table summarizes our product line. All of the products set
forth below are currently commercially available, except the following, which
are expected to be available in 2001:

     - the A-4500, a multi-slot system with high-speed optical switching
       capabilities;

     - the A-5040, a card with four high-speed 155 Mbps (OC-3c) optical
       connections; and

     - the A-7010, a card with one high-speed 622 Mbps (OC-12c) optical
       connection.

                              SINGLE-SLOT PRODUCTS

<TABLE>
<CAPTION>
  PRODUCT                                                                                                FIRST
   NAME             PROTOCOLS SUPPORTED               AVAILABLE PORTS             APPLICATIONS          SHIPMENT
  <S>       <C>                                   <C>                      <C>                          <C>
  A-1000    ATM                                   - 12 T1/E1               Low customer density points  1Q 1999
            Frame Relay                           - 1 T3/E3                of presence.
            Inverse Multiplexing over ATM (IMA)
            Multilink frame relay (MFR)
            ATM-frame relay conversion

  A-2000    ATM                                   - 4 T3/E3                Low customer density points  1Q 1999
            Frame Relay                           - 1 OC-3c                of presence or as
            ATM-frame relay conversion                                     aggregation platform behind
                                                                           multiple A-1000s, A-1240s,
                                                                           and A-3010s or other
                                                                           equipment with T3/ E3
                                                                           network connections.

  A-1240    ATM                                   - 24 T1/E1               Low to medium customer       3Q 1999
            Frame Relay                           - 1 T3/E3                density points of presence.
            IMA                                   - 1 10/100 BaseT         In-building points of
            MFR                                   Ethernet                 presence.
            ATM-frame relay conversion
            TDM (via ATM Circuit Emulation)
            VLAN (over Ethernet)

  A-3010    ATM                                   - 28 T1/E1 (over         Low to medium customer       3Q 2000
            Frame Relay                           channelized T3/E3)       density points of presence.
            IMA                                   - 1 T3/E3 (unchann.)
            MFR                                   - 1 10/100 BaseT
            ATM-frame relay conversion            Ethernet
            TDM (via ATM Circuit Emulation)
            VLAN (over Ethernet)
</TABLE>

                              MULTI-SLOT PRODUCTS

<TABLE>
<CAPTION>
  PRODUCT                                                                                                FIRST
   NAME             PROTOCOLS SUPPORTED               AVAILABLE PORTS             APPLICATIONS          SHIPMENT
  <S>       <C>                                   <C>                      <C>                          <C>
  A-4000    ATM                                   - up to 392 T1/E1        Aggregation at high          2Q 2000
            Frame Relay                           - 56 T3/E3               customer density points of
            IMA                                   - 4 OC-3c/ STM-1 or 16   presence and at sites used
            MFR                                     T3/E3 (scales to 16    to aggregate traffic from
            ATM-frame relay conversion              OC-3c/ STM-1 with      multiple smaller points of
            TDM (via ATM Circuit Emulation)         A-5040 or 4 OC-12c/    presence or buildings.
                                                    STM-4 with A-7010 in
                                                    2001)

  A-4500    IP/MPLS                               - 64 OC-3c or 16 OC-12c  Switching at high customer   Estimated
            ATM                                     alone initially        density points of presence     2001
            Frame Relay                           - Planned to scale to    and at network hub sites.
            IMA                                     higher optical speeds
            MFR                                     and densities
            ATM-frame relay conversion
            TDM (via ATM Circuit Emulation)
            Scales from speeds of DS-0 or 64
            Kbps to OC-48 and OC-192 or 9.95
            Gbps.
</TABLE>

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<PAGE>   34

TECHNOLOGY AND PRODUCT ARCHITECTURE

     Our product architecture is designed to give service providers a platform
to offer broadband services today while providing a smooth migration path to the
new generation of networks.

     SYSTEM-ON-A-CARD DESIGN

     The fundamental building block of our broadband access systems is our
system-on-a-card design. We have engineered compact entry-level systems that
contain all of the components necessary for a service provider to deliver
broadband services. With traditional systems, customers must make a considerable
upfront investment in costly equipment before installing the components that
connect to end-users. Our customers can stack our individual single-slot
products as the number of their end-users grows, and eventually move to our
multi-slot products with considerably lower upfront costs than with traditional
equipment. In addition, the cards used in our single-slot products may be
removed and inserted into our A-4000 multi-slot product, allowing our customers
to preserve their initial investments.

     PROTOCOL INDEPENDENT PORTS

     In traditional system architectures, the support of each service or
protocol is dependent on a separate hardware component. Many products were
designed to support a single type of service. Other products have incorporated
multiple services in a single system through separate physical components that
support different services. Our universal ports create a new paradigm by
eliminating the need for hardware dedicated to specific services. Through
software, our universal ports can be remotely configured for different services.
Because they are protocol-independent and software-configurable, our ports can
greatly simplify network planning and significantly reduce capital expenditures
on hardware, as service providers no longer need to install separate components
for different services.

     MULTI-SERVICE SWITCH FABRIC

     We have designed a custom switch fabric explicitly for the needs of access
networks. Our fabric employs a proprietary network processor. Our network
processor is unique in that it natively supports both cell-based, or fixed
length, and frame-based, or variable length, packet-oriented protocols without
requiring conversion between the protocols. Since cell-based protocols are able
to prioritize traffic and ensure that time sensitive voice traffic is not
delayed, the predominant approach to providing integrated voice-data services in
today's access networks centers around cell-based protocols, such as ATM.
Because of the pervasiveness of the Internet and the growth in related traffic,
an eventual migration to an Internet protocol or variable length packet based
protocol is possible. Our products' switch fabric anticipates a migration to a
native Internet protocol approach. With native support of both cell- and
frame-based packet protocols, our switch fabric adapts to the needs of today's
access networks, while providing flexibility to evolve without major hardware
modifications.

     COMMON SOFTWARE ARCHITECTURE

     Our software architecture is scalable and identical both for the
single-slot and multi-slot systems. One of our key-enabling features is a
high-performance and efficient software system that scales from a stackable to a
multi-slot product. This system supports distributed call control processing,
bandwidth resource allocation and network administration and management while
providing a common view of management information regardless of the size of the
system. Another key feature we have built into this design is a software system
that determines where specific functions occur either locally or remotely across
a system. Both of these software features preserve a consistent "look and feel"
to the user. This facilitates network management and service provisioning and
allows customers to preserve their investment in network management systems and
our existing hardware as they grow their network into higher densities and new
services.

     MULTISTREAM TECHNOLOGY

     Most local access networks are based on connections that come in two sizes:
T1/E1 or T3/E3. There is a large difference in capacity and cost between the
T1/E1, which represents 1.5/2.0 Mbps, and the T3/E3, which represents 45/34
Mbps. Moreover, service providers typically take longer to provision or deliver
T3/E3

                                       32
<PAGE>   35

connections. In many smaller markets these larger connections may not be readily
available. Our MultiStream technology bridges the capacity and cost gaps between
T1/E1 and T3/E3. This technology bundles multiple physical T1/E1s onto one
logical connection that operates like a single large "pipe." The total capacity
of a bundle equals the sum of the combined links. However, if one of the T1/E1
connections should fail, the software adjusts the capacity downward and
continues using the remaining active T1/E1 lines, providing a built-in source of
network redundancy.

     MultiStream employs bundling technology for both ATM traffic, which is
called inverse multiplexing over ATM, or IMA, and frame relay traffic, which is
called multi-link frame relay, or MFR. Because all of our product ports are
configured with software, we believe we are the only equipment provider who can
support both IMA bundles and MFR bundles simultaneously on the same card. In
addition, the software configurability of our broadband access platforms allows
the service provider to add T1/E1 connections and increase the connection size
without interrupting service.

     Service providers can apply our MultiStream technology in two ways:

     - End-user applications and services. Service providers can bundle
       connections from the central office or point of presence to the end-user
       to offer a menu of access speeds between a T1/E1 and a T3/E3.

     - Internal service provider network connections.  MultiStream technology
       can also be applied to connections from the central office to the network
       or between points of presence, allowing the service provider to (1) save
       money and avoid wasted capacity with a bundled connection instead of a
       T3/E3 and (2) speed time to market by utilizing more readily available
       T1/E1 connections when a T3/E3 connection is unavailable or will not be
       available for several months.

CUSTOMERS

     We market to telecommunications and data communications service providers
worldwide. Customers that have purchased or committed to purchase in excess of
$100,000 of our products through September 30, 2000: AccessLan, BroadBand
Office, Broadview Networks, Dishnet DSL, Intermedia Communications, Inc., mPower
Communications, Qwest Communications, 2nd Century Communications, Urban Media
and UUNet. We focus on the following key service provider market segments:

     NEXT-GENERATION CARRIERS

     Emerging carriers, which we refer to as next-generation carriers, include
several different classifications of service providers including CLECs, Internet
service providers and other more traditional service providers. Next generation
carriers, however, are unified by their fundamental reliance on packet network
architectures to provide advanced broadband services. Next-generation carriers
are moving away from traditional voice-oriented architectures and extending
packet platforms into the far reaches of their networks. Many are driving to
offer integrated voice-data-multimedia services over a single network
infrastructure, while some are expanding and extending their data networks to
satisfy their customers' bandwidth and networking demands. Our broadband access
platforms can be used by next-generation carriers to extend their networks to
new locations, offer additional and differentiated services and migrate to an
advanced architecture. Our customers that are next-generation carriers include:
2nd Century Communications, Intermedia Communications Inc., Qwest Communications
and UUNet.

     MULTI-TENANT UNIT SERVICE PROVIDERS

     Multi-tenant unit service providers represent a relatively new class of
service provider that locates a point of presence or "mini-central office" in
the basement or wiring closet of a shared office building. By creating this
service aggregation point within a building, the multi-tenant unit service
provider is able to bypass the ILEC network, thereby eliminating the need to
rent space and place equipment at the ILEC's central office. As a result, the
multi-tenant unit service provider can deliver differentiated services to
building tenants with significant cost advantages compared to the ILEC and
improve customer responsiveness. While it may take several weeks for an end user
to obtain service from an ILEC's central office, once a multi-tenant unit
service provider has a point-of-presence in a building, an end-user in that
building can generally receive service in a matter of days. Many multi-tenant
unit service providers intend to use the in-building approach as leverage to

                                       33
<PAGE>   36

launch nationwide service delivery networks and for delivering business
application level services to end-users. Our products can be used by
multi-tenant unit service providers for in-building service delivery as well as
at metropolitan aggregation sites. We market to the class of multi-tenant unit
service providers that sell to the business market. Our customers that are
multi-tenant unit service providers include: BroadBand Office and Urban Media.

     DIGITAL SUBSCRIBER LINE SERVICE PROVIDERS

     There has been significant investment over the past several years by
service providers offering broadband services using digital subscriber line
technology, a technology that provides high-speed access services over standard
copper telephone lines. These service providers place equipment, known as
digital subscriber line access multiplexers, or DSLAMs, at ILEC central offices
and connect residential or corporate customer access lines to these devices to
deliver broadband access. We market to digital subscriber line service providers
that are facilities-based, meaning that they purchase and install their own
DSLAMs and network infrastructure, instead of reselling services from another
service provider. Our products can help carry the user's traffic from the DSLAM
or multiple DSLAMs into the service provider's core more cost-effectively. Our
customers that are digital subscriber line service providers include: Broadview
Networks, Dishnet DSL, mPower Communications and Network Plus (through an
original equipment manufacturing arrangement with AccessLan).

     The following examples illustrate how organizations in our target markets
are using our products to deploy their broadband service offerings:

     CLEC TARGETS NEW REVENUE OPPORTUNITIES THROUGH MULTISTREAM TECHNOLOGY

     One of the country's largest CLECs wanted to offer customers a menu of
frame relay and ATM services with access speeds between 1.5 Mbps (T1) and 45
Mbps (T3) to increase market share and revenue. Traditionally, when end-user
customers reach capacity on a T1 connection, their options are limited: they can
either purchase a T3 line, which would be expensive and severely underutilized;
or purchase costly proprietary equipment. This CLEC chose our products as a way
to bridge the T1-T3 gap and be first to market in providing incremental frame
relay and ATM bandwidth options between 1.5 Mbps and 45 Mbps. Currently, the
CLEC is in the process of deploying our stand-alone products such as the A-1240
in lower density sites and plans to deploy the A-4000 in higher density sites.

     NEXT-GENERATION CLEC OFFERS INTEGRATED SERVICES AT SIGNIFICANT COST
ADVANTAGE OVER INCUMBENT CARRIER

     A next-generation CLEC wanted to build a local access network that did not
rely on existing infrastructure or equipment. It estimated that the cost of
building a packet-based network that supports both voice and data would be
approximately 60 percent less than a voice-oriented network. Traditionally,
network service providers have offered voice and data services over a
voice-oriented or TDM infrastructure. With TDM, voice and data services are
delivered to the customer through separate overlay networks. As a result,
bandwidth and equipment ports throughout the network must remain dedicated to
specific customer applications even when those applications are inactive. Our
customer sought to eliminate the need for separate overlay networks in order to
obtain the cost advantages and offer the enhanced services it needed to compete
with incumbents.

     Our customer chose our products to play an integral role in its
infrastructure and deployed our stand-alone broadband access platforms in
central offices to aggregate traffic from multiple customers and create a single
network connection into the core network. Our products permit our customer's
network capacity and ports on core switches to be shared among different
applications and customers. In addition, the compact size of our broadband
access platforms reduces their space requirements. With a packet-oriented
network in place, our customer can offer integrated voice and data services over
existing connections without having to purchase traditional TDM and voice
switching equipment. As a result, our customer can compete aggressively against
incumbents and offer unique services.

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<PAGE>   37

     MULTI-TENANT UNIT SERVICE PROVIDER ATTACKS SMALL-MEDIUM BUSINESS MARKET
     WITH NEW APPROACH

     A multi-tenant unit service provider needed to rapidly deploy services to
large numbers of shared office buildings nationwide. In order to capture
customers, our customer had to differentiate its service offerings from those of
incumbent providers. Our customer faced two main connectivity problems: how to
distribute services within a building and how to connect that building to its
nationwide network. The uneven mix of facilities available to connect buildings
to the network exacerbated these problems.

     Our customer selected the A-1240 broadband access platform to establish a
point of presence in large numbers of office buildings, deliver high-speed
Internet access and other services within the buildings, integrate end-user
voice traffic and connect all traffic to its network. It chose our broadband
access platform because it allows the service provider to offer end-users a
range of Internet bandwidth options up to 100 Mbps and to reconfigure an
end-user's access speed remotely through software. Additionally, end users'
existing voice equipment can connect directly to the A-1240, providing a
mechanism for the multi-tenant unit service provider to integrate voice traffic
with little disruption to the customer's existing equipment. Our A-1240's
flexibility enables our customer to use multiple methods when connecting
buildings to its network, and our MultiStream technology allows it to deploy
services rapidly by bundling T1 connections when a T3 connection is not
available. Our customer also installed our equipment at its metropolitan hub
sites to aggregate traffic from multiple buildings for a faster, more efficient
access network architecture.

SALES AND MARKETING

     We sell our broadband access platforms primarily through a direct sales
force both domestically and internationally. We also drive awareness and
customer acceptance of our products through strategic relationships with
original equipment manufacturers, distributors and resellers. Because of our
focus on the access network, we have established co-marketing relationships with
a wide range of equipment providers operating either inside service provider
networks closer to the core or at the end-user location. We seek to partner
widely to deliver a complete, end-to-end solution to service providers. To that
end, we have a variety of co-marketing arrangements designed to extend our reach
into our service provider segments. As of September 30, 2000, our sales and
marketing organization consisted of 46 persons in 9 locations.

     SALES

     Direct Sales.  Our direct sales force is regionally dispersed throughout
the United States, in Canada and the United Kingdom, and we plan to establish an
office in Hong Kong to cover the Asian market. Our sales force is comprised of
regional sales directors, managers and system engineers who manage customer
relationships and sell our products into different levels of the service
provider organization.

     Distribution Channel Sales.  We intend to develop relationships with
distribution partners and resellers to extend our market reach to additional
service providers, including regional service providers and independent
telephone companies. These relationships will also provide an additional product
fulfillment channel. We currently have agreements with Consulintel, Netways,
Solunet, Technica Corporation, Walker Associates and Westcon.

     Original Equipment Manufacturer Sales.  We intend to employ relationships
with a limited number of original equipment manufacturers to expand our market
reach, especially in segments or application areas where we are part of a
complete solution. We currently have agreements with AccessLan and Alidian.

     International Sales.  We are currently building our international sales
organization, primarily in Europe, Asia and Latin America. In addition, we seek
to develop strategic relationships with key system integrators and resellers to
build acceptance for our products. We anticipate that we will rely on these
types of relationships to a greater degree internationally than domestically.

     MARKETING

     We have a variety of marketing programs and initiatives to support the sale
and distribution of our products. We target these activities to prospective and
existing customers, distribution partners and resellers, and the trade press and
analysts. Marketing activities include preparation of sales tools, business
cases, competitive analyses and other marketing collateral, sales training,
publication of customer deployments, new

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<PAGE>   38

product information and educational articles in industry journals, maintenance
of our World Wide Web site as well as an Intranet site, participation in
technical conferences, advertising in industry journals and other venues, and
direct marketing to prospective customers. We also participate in leading
industry tradeshows domestically and internationally.

CUSTOMER SERVICE

     Providing a high level of service and support is critical to our objective
of establishing and developing long-term customer relationships. Our expanding
customer service and support efforts are divided into three distinct functions
that ensure effective implementation of our products. First, product quality
assurance seeks to ensure that the highest quality product is available for sale
to customers. Second, project management provides the technical leadership,
support and training to help existing or potential customers understand new
products in order to bring the product to revenue-generating capability as
quickly as possible. Finally, network support provides our customers with
ongoing support once the equipment has been sold and installed. As our product
base continues to expand, we intend to offer an enhanced level of customer
support on a post-product sale basis. We expect to charge our customers
separately when we do begin to offer this higher level of service. Currently,
our customer service and support organization is comprised of headquarters-based
software, project and application engineers and field-based network engineers.
Services are delivered through web-based support, by phone or in person.

RESEARCH AND DEVELOPMENT

     We have assembled a team of highly experienced networking professionals
recruited from industry-leading communications companies. Our product
development staff has successfully developed hardware and software products and
has expertise in the areas of voice, frame relay, ATM, IP, switching/routing,
network management, and provisioning for carrier-class networks. The team
includes hardware and software engineers, many with advanced degrees and proven
product successes for wide area switching and routing systems. As of September
30, 2000, we employed 79 people in our research and development staff, with
plans to continue expanding all functional areas of our research and development
organization. Research and development expenses totaled $3.7 million in 1998,
$6.7 million in 1999 and $5.5 million in the first six months of 2000.

MANUFACTURING

     Our manufacturing operations consist of prototype development, materials
planning and procurement, final assembly, testing, systems integration, order
fulfillment and quality control. This subcontracting activity extends from
prototypes to full production and includes activities such as material
procurement, final assembly, test, control and shipment to our customers. We
design, specify and monitor all of the tests that are required to meet internal
and external quality standards. We maintain relationships with strategic
technology suppliers in tandem with Benchmark and utilize distribution channels
to help manage supply.

     We currently subcontract the manufacturing and testing of substantially all
of our products through purchase orders with Benchmark Electronics. We have not,
however, entered into any long-term agreements with Benchmark Electronics. Our
reliance on Benchmark Electronics as our principal manufacturer exposes us to a
number of risks, including reduced control over manufacturing capacity, product
completion and delivery times, product quality and manufacturing costs. If
Benchmark Electronics is unable or unwilling to manufacture a sufficient
quantity of products for us, on the time schedules and with the quality that we
demand, we may not be able to fulfill customer orders on a timely basis and may
be forced to engage additional or replacement manufacturers. We have identified
potential alternative manufacturers if Benchmark terminates its relationship
with us. However, qualifying a new contract manufacturer and commencing a volume
production is expensive and time consuming. If we are required or choose to
change contract manufacturers, our revenue may decline and our customer
relationships may be damaged.

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<PAGE>   39

COMPETITION

     Our product line is focused on providing the next-generation access
solution for the access network. Many vendors have product lines that compete in
the broadband access equipment market. We believe that the principal competitive
factors for next-generation access equipment are:

     - scalability to high and low customer density locations with a
       cost-effective solution;

     - multi-service capability with service interworking;

     - inherent support of voice, data, and multimedia traffic;

     - ability to support new protocols and services with software upgrades;

     - product innovation and speed to market;

     - ability to react quickly to customer demands and requirements; and

     - price.

     Many of our current and potential competitors, including Alcatel, Cisco
Systems, Lucent Technologies, Marconi (Fore) and Nortel Networks, are large
public companies that have longer operating histories and significantly greater
financial, technical, marketing and other resources than we do. As a result,
these competitors are able to devote greater resources to the development,
promotion, sale and support of their products. In addition, competitors with
large market capitalizations or cash reserves are much better positioned than we
are to acquire other companies, including our competitors, and thereby acquire
new technologies or products that may displace our product lines.

     Many of our competitors have significantly more established customer
support and professional services organizations than we do. In addition, many of
our competitors have more extensive customer bases and broader customer
relationships than we do, including relationships with many of our current and
potential customers. Moreover, these competitors often have broader product
offerings than we do. These companies can leverage their customer relationships
and broader product offerings and adopt aggressive pricing policies to gain
market share. As a result, we may not be able to maintain a competitive position
against current or future competitors. Our failure to maintain and enhance our
competitive position within the market could seriously harm our business,
results of operations and financial condition.

INTELLECTUAL PROPERTY

     We rely on a combination of patent, copyright, trademark and trade secret
laws and contractual restrictions to protect our proprietary rights. We have one
U.S. patent, and we have filed a corresponding application under the Patent
Cooperation Treaty relating to the management of tunneling protocols. There can
be no assurance that these patent applications will be approved, that any issued
patents will protect our intellectual property or that third parties will not
challenge them. Furthermore, there can be no assurance that others will not
independently develop similar or competing technology or design around any
patents that may be issued. We also have four pending trademark applications in
the United States and three domain names.

     We enter into confidentiality or license agreements with our employees,
consultants and corporate partners, and control access to and distribution of
our software, documentation and other proprietary information. Despite our
efforts to protect our proprietary rights, unauthorized parties may attempt to
copy or otherwise obtain and use our products or technology. There can be no
assurance that these precautions will prevent misappropriation or infringement
of our intellectual property. Monitoring unauthorized use of our products is
difficult, and we cannot be certain that the steps we have taken will prevent
misappropriation of our proprietary rights, particularly in foreign countries
where the laws may not protect our proprietary rights as fully as in the United
States.

     The broadband access equipment industry is characterized by the existence
of a large number of patents and frequent claims and related litigation
regarding patent and other intellectual property rights. In particular, leading
companies in the data communications and networking markets have extensive
patent portfolios with respect to networking technology. We recently received a
letter from Nortel Networks Corporation alleging that a specific feature of our
products infringes one of Nortel's patents relating to inverse multiplexing over
ATM. We believe that our products do not infringe the relevant Nortel patent and
we intend to contest this claim vigorously. However, we cannot assure you that
we will prevail in our objection to this claim or any other

                                       37
<PAGE>   40

claim Nortel may make with respect to other patents it owns, nor can we assure
you that this dispute will not result in litigation or that an adverse result or
judgment will not adversely affect our financial condition. The Nortel claim
could be time-consuming, result in costly litigation and diversion of technical
and management personnel, or require us to develop non-infringing technology. If
Nortel succeeds in its claim, we would need to enter into royalty or license
agreements. These royalty or license agreements, if required, may not be
available on acceptable terms, if at all. If there is a successful claim of
infringement or if we fail to develop non-infringing technology or license the
proprietary rights on a timely basis, our ability to use certain technologies,
products and brand names may be limited and our business may be harmed.

     From time to time, other third parties, including leading companies, have
asserted against others and may assert against us patent, copyright, trademark
and other intellectual property rights. We expect that we may increasingly be
subject to infringement claims as the numbers of products and competitors in the
market for broadband access equipment grow and the functionality of products
overlaps. If third parties assert claims or initiate litigation against us or
our manufacturers, suppliers or customers alleging infringement of their
proprietary rights with respect to our existing or future products, we will be
subject to risks similar to those described in the preceding paragraph.

     We have agreed and may agree in the future to indemnify certain of our
customers against claims that our products infringe upon the proprietary rights
of others. We could incur substantial costs in defending ourselves and our
customers against infringement claims. In the event of a claim of infringement,
we and our customers may be required to obtain one or more licenses from third
parties. We cannot assure you that we or our customers could obtain necessary
licenses from third parties at a reasonable cost or at all.

     We have licensed, and may license in the future, elements of our
trademarks, trade dress and similar proprietary rights to third parties. We
attempt under such licenses to ensure that the quality of our brand is
maintained by these parties, however, such third parties may take actions that
could materially and adversely affect the value of our proprietary rights or
reputation.

     Litigation may be necessary in the future to enforce or defend our
proprietary rights or to determine the validity and scope of the proprietary
rights of others. This litigation, whether successful or unsuccessful, could
result in substantial costs and diversion of management and technical resources.
In addition, any inability to protect our proprietary rights may harm our
business and financial prospects.

     We license from third parties software that is used in our products or is
required to develop new products or product enhancements. In the future,
third-party licenses may not be available to us on commercially reasonable terms
or at all. Third parties who hold exclusive rights to software technology that
we seek to license may include our competitors. If we are unable to obtain any
necessary third-party licenses, we would be required to redesign our product or
obtain substitute technology, which may perform less well, be of lower quality
or be more costly.

GOVERNMENT REGULATION

     In the United States, our products must comply with various regulations and
standards defined by the Federal Communications Commission, or FCC, and
Underwriters Laboratories. Internationally, products that we develop may be
required to comply with standards established by telecommunications authorities
in various countries as well as with recommendations of the International
Telecommunication Union. Moreover, the encryption technology contained in our
products is subject to U.S. export controls, which limit our ability to
distribute some versions of our products outside of the United States and
Canada. If we do not comply with existing or evolving standards and regulations
or if we fail to obtain timely domestic or foreign regulatory approvals or
certificates, we would not be able to sell our products where these standards or
regulations apply, which may prevent us from sustaining our revenue or
maintaining profitability.

     The jurisdiction of the FCC extends to the communications industry, to our
customers and to the products and services that our customers sell. Future FCC
regulations, or regulations set forth by other regulatory bodies, may adversely
affect the broadband access services industry. Regulation of our customers may
have a material adverse affect on our business, results of operations and
financial condition. For example, FCC regulatory policies that affect the
availability of data and Internet services may impede our customers' penetration
into broadband access markets. In addition, international regulatory bodies are
beginning to adopt

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<PAGE>   41

standards for the communications industry. The delays that these governmental
processes may entail may cause order cancellations or postponements of product
purchases by our customers, which would materially adversely affect our
business, results of operations and financial condition.

EMPLOYEES

     As of September 30, 2000, we had a total of 155 employees, of whom 150 were
based in the United States and five were based internationally. Seventy-nine of
our employees are engaged in research and development, 16 in operations, 46 in
marketing and sales and 14 in finance and administrative functions.
Additionally, we hire consultants as necessary. We believe that our future
success will depend in significant part on our ability to attract and retain
highly skilled technical, marketing and management personnel. None of our
employees are represented by a labor union or subject to a collective bargaining
agreement. We believe that our relations with our employees are good.

FACILITIES

     Our executive offices and principal operations are located in Vienna,
Virginia. We lease approximately 21,000 square feet of office and laboratory
space pursuant to a lease that expires on November 30, 2005. We lease an
additional 21,000 square feet in the same building under a lease that expires on
August 31, 2002. We also lease sales offices in Tampa, Boston, Denver, Dallas
and Atlanta. We believe that our facilities are adequate to meet our current
needs, and that additional facilities will be available as we expand in the
future.

LEGAL PROCEEDINGS

     We are not aware of any pending legal proceedings against us that,
individually or in the aggregate, would have a material adverse effect on our
business, results of operations or financial condition. We may in the future be
party to litigation arising in the course of our business, including claims that
we allegedly infringe on third-party trademarks and other intellectual property
rights. These claims, even if not meritorious, could result in the expenditure
of significant financial and managerial resources.

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<PAGE>   42

                                   MANAGEMENT

     The following table sets forth information regarding our executive officers
and directors.

<TABLE>
<CAPTION>
            NAME              AGE                           POSITION
            ----              ---   --------------------------------------------------------
<S>                           <C>   <C>
Asghar D. Mostafa...........  42    Chairman, President and Chief Executive Officer
Ronald S. Westernik.........  45    Director, Senior Vice President-Business Development and
                                      Strategy
James R. Loehndorf, Jr......  45    Vice President and Chief Scientist
Harry J. D'Andrea...........  44    Chief Financial Officer
Lisa Adams..................  43    Senior Vice President-Worldwide Sales
Glen A. Hunt................  52    Vice President-Engineering
Lawrence Kraft..............  34    Vice President-Marketing
Alexander H. Dobson.........  37    Vice President-Sales
Jeffrey M. Range............  40    Vice President-Worldwide Operations
Betsy S. Atkins.............  45    Director
Henry G. Baker..............  53    Director
Robert Ted Enloe, III(1)....  61    Director
Richard H. Kimball(1).......  43    Director
Arthur J. Marks(1)(2).......  55    Director
Edward W. Scott(2)..........  37    Director
John W. Seazholtz(2)........  63    Director
</TABLE>

---------------
(1) Member of Audit Committee

(2) Member of Compensation Committee

     Asghar D. Mostafa has served as our President, Chief Executive Officer and
Chairman of the board of directors since our inception. Prior to co-founding our
company, Mr. Mostafa served as Vice President and general manager of 3Com
Corporation's Broadband Access Communications Division from August 1995 to
August 1997. From February 1990 to May 1995, Mr. Mostafa was the founder,
President, and Chief Executive Officer of ISDN Systems Corporation. Previously,
he was Vice President of Product Development for the telecommunications division
of Data General Corporation as well as co-founder and director of engineering
for International Communications, Inc., a developer of T1 multiplexers.

     Ronald S. Westernik has served as our Senior Vice President-Business
Development and Strategy since July 1999, as a director since our inception, and
previously served as our Vice President-Marketing from our inception to June
1999. Prior to co-founding our company, Mr. Westernik was Vice President of
Marketing for the Broadband Access Communications Division at 3Com from June
1996 to June 1997. Mr. Westernik also spent 17-years with AT&T Corp., where he
held several positions including Director of Strategy and Planning for Systems
Marketing.

     James R. Loehndorf, Jr. has served as our Vice President and Chief
Scientist since our inception. Prior to co-founding our company, Mr. Loehndorf
was Systems Architect for the Broadband Access Communications Division at 3Com
from October 1996 to September 1997. From May 1989 to October 1996, Mr.
Loehndorf was a senior member of the technical staff at Ameritech Corporation's
Science and Technology Group, responsible for Ameritech's ADSL strategy. He also
served as a data-communications systems architect at ITT/Courier from May 1978
to May 1989.

     Harry J. D'Andrea has served as our Chief Financial Officer since June
1999. Prior to joining our company, Mr. D'Andrea served as Chief Financial
Officer for Call Technologies, Inc. from 1998 to June 1999. He was also Chief
Financial Officer of Yurie Systems, Inc. (acquired by Lucent Technologies) from
1997 to 1998 and Chief Financial Officer of American Communications Services,
Inc. (now e.spire Communications) in 1996. From 1993 to 1995, Mr. D'Andrea
served as Executive Vice President, Chief Financial Officer and Treasurer at
Caterair International Corporation. He has also held senior management positions
at Marriott Corporation. Mr. D'Andrea serves on the board of directors of
Informax, Inc.

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<PAGE>   43

     Lisa Adams has served as our Senior Vice President-Worldwide Sales since
September 2000. Prior to joining our company, Ms. Adams served as Executive Vice
President of Sales and Business Development for NetRail from September 1999 to
September 2000. She was also the Southeastern Sales Manager of Ascend
Communications (acquired by Lucent Technologies) from 1997 to 1999. Ms. Adams
served as Carrier Account Manager for Cascade Communications Corporation
(acquired by Ascend Communications) from October 1994 to June 1997. From 1992 to
1994, Ms. Adams served as Western Regional Manager for On-Stream Networks, Inc.
(purchased by 3Com Corporation).

     Glen A. Hunt has served as our Vice President-Engineering since June 1999
and as our Vice President-Product Development from January 1999 to June 1999.
Mr. Hunt joined our company from Netrix Corporation where he was Executive
Director of Network Products from July 1992 to January 1997 and Vice President
of Marketing from January 1997 to December 1998. Previously, he was Director of
Advanced Network Management for Sprint from April 1988 to June 1992 and Director
of Product Development at Dynatech Corporation from April 1985 to March 1988.

     Lawrence Kraft has served as our Vice President-Marketing since June 1999.
Prior to joining our company, Mr. Kraft was Vice President of Marketing for
NetFax Corporation from July 1998 to October 1998. Previously, he was Manager of
Product Marketing at U.S. Robotics (now 3Com) from August 1995 to October 1997,
vice president of marketing at ISC from June 1995 to August 1995, and held
various positions with Sprint Corporation from June 1992 to June 1995, including
Group Product Manager for SprintLink Internet services.

     Alexander H. Dobson has been with our company since January 1999 and served
as Vice President-Sales since October 1999. Mr. Dobson joined our company from
3Com where he managed the worldwide activities of the MCIWorldCom account team
from February 1998 to January 1999. Previously, he was the director of carrier
sales for U.S. Robotics (now 3Com) Canada from January 1996 to February 1998 and
held various sales and sales management positions at Motorola Information
Systems from May 1993 to January 1996.

     Jeffrey M. Range has served as our Vice President-Worldwide Operations
since January 2000. Mr. Range joined our company from Newbridge Networks, Inc.,
where he held several management positions including Vice President, NSA
Operations from September 1996 to November 1999. Mr. Range also served as Vice
President, Corporate Planning and Logistics for Newbridge Networks, Inc. in
Canada from September 1993 to September 1996.

     Betsy S. Atkins has served as a director of our company since August 2000.
Since 1995, Ms. Atkins has served as Chief Executive Officer of Baja
Corporation, a consulting firm. Prior to joining Baja, Ms. Atkins was the Chief
Executive Officer of NCI, a manufacturing company. Ms. Atkins is a founder of
Ascend, a Lucent Network Solutions company and serves on the board of directors
of Lucent Technologies. She also serves on the board of directors of Polycom
Corporation and Selectica, Inc.

     Henry G. Baker, Ph.D. has served as a director of our company since August
1998. Since March 1996, Dr. Baker has been a co-founder and general partner of
Baker Communications Fund, L.P., a private equity fund that invests exclusively
in communications equipment, services and application providers. Prior to
co-founding Baker Communications, Dr. Baker consulted for various venture
capital firms and start-up companies. From 1980 to 1985, he was a founder and
employee of Symbolics, Inc., a computer workstation manufacturer.

     Robert Ted Enloe, III has served as a director of our company since June
2000. Mr. Enloe has been managing partner of Balquita Partners, Ltd., a real
estate and securities investment partnership, since 1996. Mr. Enloe served as
Vice Chairman and a member of the Office of the Chief Executive of Compaq
Computer Corporation from April to July 1999. From 1975 to 1996 he was
president, and from 1992 to 1996 Chief Executive Officer, of Liberte Investors,
Inc. Mr. Enloe is also a director of Compaq, Leggett & Platt, Inc. and Data
Return Corporation.

     Richard H. Kimball has served as a director of our company since September
1999. Mr. Kimball is a Managing General Partner of Technology Crossover
Ventures, a venture capital firm he co-founded in 1995. Prior to that, Mr.
Kimball spent over ten years at Montgomery Securities serving as a securities
analyst and

                                       41
<PAGE>   44

Managing Director. He is currently on the board of directors of Copper Mountain
Networks, Vastera, Inc. and several private companies.

     Arthur J. Marks has served as a director of our company since September
1999. Since 1984, Mr. Marks has been a general partner of New Enterprise
Associates, a private equity fund that invests in early stage companies in
information technology and medical and life sciences. Mr. Marks serves on the
board of directors of Epicor Software, eXcelon Corporation, Progress Software,
Talk.com and several private companies.

     Edward W. Scott has served as a director of our company since August 1998.
Since March 1996, Mr. Scott has been a co-founder and general partner of Baker
Communications Fund, L.P., a private equity fund that invests exclusively in
communications equipment, services and application providers. Prior to co-
founding Baker Communications, from December 1990 to March 1996 Mr. Scott was a
private equity investor with the Apollo Investment Fund, L.P. Mr. Scott also
serves on the board of directors of Akamai Technologies, Inc. and several
private companies.

     John W. Seazholtz has served as a director of our company since April 1998.
Since April 2000, Mr. Seazholtz has been Chairman of the board of directors of
Westell Technologies, Inc. From May 1998 to April 2000, Mr. Seazholtz was the
President and CEO of Telesoft America, Inc. (a subsidiary of Telesoft spa).
Prior to Telesoft, he was the Chief Technology Officer for Bell Atlantic
Corporation from 1984 to April 1998. Mr. Seazholtz has also worked at New Jersey
Bell, Bell Telephone Laboratories and AT&T. Mr. Seazholtz also serves on the
board of directors of Odetics, Inc.

BOARD OF DIRECTORS

     Our board of directors currently consists of nine members. Upon the
completion of this offering, the terms of office of the board of directors will
be divided into three classes: Class I, whose term will expire at the annual
meeting of stockholders to be held in 2001; Class II, whose term will expire at
the annual meeting of stockholders to be held in 2002; and Class III, whose term
will expire at the annual meeting of the stockholders to be held in 2003. At
each annual meeting of stockholders after the initial classification, the
successors to directors whose terms will then expire will be elected to serve
from the time of election and qualification until the third annual meeting
following election. This classification of the board of directors may have the
effect of delaying or preventing a change of control or management of our
company. Each officer serves at the discretion of the board of directors. There
are no family relationships among any of our directors or officers.

     BOARD COMMITTEES

     Our board of directors currently has two committees: an audit committee and
a compensation committee. The audit committee consists of Messrs. Enloe, Kimball
and Marks. The audit committee makes recommendations to our board of directors
regarding the selection of independent auditors, reviews the results and scope
of audit and other services provided by our independent auditors and reviews the
accounting principles and auditing practices and procedures to be used for our
financial statements. The compensation committee consists of Messrs. Marks,
Scott and Seazholtz. The compensation committee makes recommendations to our
board of directors regarding our stock plans and the compensation of officers
and other managerial employees.

     DIRECTOR COMPENSATION

     Directors currently do not receive any cash compensation from us for their
services as members of our board of directors, although we are authorized to pay
members for attendance at meetings or a salary in addition to reimbursement for
expenses in connection with attendance at meetings. We have granted options to
our directors in the past and we may continue to do so in the future.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     None of the members of the compensation committee is currently or has been
an officer or employee of ours at any time since our formation. No member of the
compensation committee serves as a member of the board of directors or
compensation committee of any entity that has one or more executive officers
serving as a member of our board of directors or compensation committee.

                                       42
<PAGE>   45

LIMITATION OF LIABILITY AND INDEMNIFICATION

     Pursuant to the Delaware General Corporation Law, we will adopt provisions
in our certificate of incorporation that limit or eliminate the personal
liability of our directors for a breach of their fiduciary duty of care as a
director. The duty of care generally requires that, when acting on behalf of the
corporation, directors exercise an informed business judgment based on all
material information reasonably available to them. Consequently, a director will
not be personally liable to us or our stockholders for monetary damages or
breach of fiduciary duty as a director, except for liability for:

     - any breach of the director's duty of loyalty to us or our stockholders;

     - acts or omissions not in good faith or that involve intentional
       misconduct or a knowing violation of law;

     - unlawful payments of dividends or unlawful stock repurchases, redemptions
       or other distributions; or

     - any transaction from which the director derived an improper personal
       benefit.

     Our certificate of incorporation also will allow us to indemnify our
officers, directors and other agents to the full extent permitted by Delaware
law. We have entered into indemnification agreements with each of our directors
and officers that give them additional contractual reassurances regarding the
scope of indemnification and that provide additional procedural protection. The
indemnification agreements require actions such as:

     - indemnifying officers and directors against certain liabilities that may
       arise because of their status as officers or directors; and

     - advancing expenses, as incurred, to officers and directors in connection
       with a legal proceeding, subject to certain limited exceptions.

     The limited liability and indemnification provisions in our certificate of
incorporation may discourage stockholders from bringing a lawsuit against our
directors for breach of their fiduciary duty and may reduce the likelihood of
derivative litigation against our directors and officers, even though a
derivative action, if successful, might otherwise benefit us and our
stockholders. Moreover, a stockholder's investment in our company may be
adversely affected to the extent we pay the costs of settlement or damage awards
against our directors and officers under these indemnification provisions. At
present, there is no pending litigation or proceeding involving any of our
directors, officers or employees in which indemnification is sought, nor are we
aware of any threatened litigation that may result in claims for
indemnification.

EXECUTIVE COMPENSATION

     The table below sets forth, for the fiscal year ended December 31, 1999,
the compensation earned by:

     - our chief executive officer; and

     - our next four most highly compensated executive officers, collectively
       referred to below as the named executive officers.

     In accordance with the rules of the Securities and Exchange Commission, the
compensation set forth in the table below does not include medical, group life
or other benefits which are available to all of our salaried employees, and
perquisites and other benefits, securities or property which do not exceed the
lesser of $50,000 or 10% of the person's salary and bonus shown in the table. In
the table below, columns required by the

                                       43
<PAGE>   46

regulations of the Securities and Exchange Commission have been omitted where no
information was required to be disclosed under those columns.

<TABLE>
<CAPTION>
                                                                                               LONG-TERM
                                                                       ANNUAL                 COMPENSATION
                                                                    COMPENSATION                 AWARDS
                                                          ---------------------------------   ------------
                                                                                  OTHER        SECURITIES
                                                                                  ANNUAL       UNDERLYING
              NAME AND PRINCIPAL POSITION                  SALARY     BONUS    COMPENSATION     OPTIONS
              ---------------------------                 --------   -------   ------------   ------------
<S>                                                       <C>        <C>       <C>            <C>
Asghar D. Mostafa.......................................  $164,583   $    --     $    --              --
  President and Chief Executive Officer
Glen A. Hunt............................................   138,889        --          --          60,000
  Vice President-Engineering
James R. Loehndorf, Jr..................................   110,000    25,000      96,657(1)           --
  Vice President and Chief Scientist
Ronald S. Westernik.....................................   105,208    25,000          --              --
  Senior Vice President-Business Development and
    Strategy
Alexander H. Dobson.....................................    66,458    34,781(2)        --        151,562
  Vice President-Sales
</TABLE>

---------------
(1) Represents reimbursement of an amount that, after taxes, was sufficient to
    cover relocation expenses.

(2) Represents bonus and commission income.

OPTION GRANTS IN LAST FISCAL YEAR

     The following table sets forth information with respect to stock options
granted by us to the named executive officers during 1999. All of these options
granted by us were granted under the Second 1998 Nonqualified Stock Option Plan
and have a term of 10 years, subject to earlier termination in the event the
optionee's services to our company cease. See "-- Stock Option Plans" for a
description of the material terms of these options. During fiscal 1999, we
granted options to purchase a total of 1,913,979 shares of common stock under
our Second 1998 Nonqualified Stock Option Plan.

<TABLE>
<CAPTION>
                                                                                              POTENTIAL REALIZABLE
                                          INDIVIDUAL GRANTS                                     VALUE AT ASSUMED
                         ----------------------------------------------------                     ANNUAL RATES
                         NUMBER OF      PERCENT OF                                            OF PRICE APPRECIATION
                         SECURITIES   TOTAL OPTIONS    EXERCISE                                FOR OPTION TERM(3)
                         UNDERLYING     GRANTED TO     PRICE PER                             -----------------------
                          OPTIONS      EMPLOYEES IN      SHARE     EXPIRATION   ESTIMATED
         NAME             GRANTED     FISCAL 1999(1)    ($/SH)        DATE       VALUE(2)        5%          10%
         ----            ----------   --------------   ---------   ----------   ----------   ----------   ----------
<S>                      <C>          <C>              <C>         <C>          <C>          <C>          <C>
Asghar D. Mostafa......        --           --              --            --            --           --           --
Glen A. Hunt...........    60,000          3.1%          $1.50       1/11/09    $  810,000   $1,376,005   $2,244,368
James R. Loehndorf,
  Jr. .................        --           --              --            --            --           --           --
Ronald S. Westernik....        --           --              --            --            --           --           --
Alexander H. Dobson....   100,000          5.2            1.50       2/15/09     1,350,000    2,293,342    3,740,614
                           40,000          2.1            2.00      11/01/09       520,000      897,337    1,476,245
                            3,242          0.2            2.00      10/31/09        42,146       72,729      119,650
                            1,876          0.1            2.00      11/30/09        24,388       42,085       69,236
                            6,444          0.3            2.00      12/31/09        83,772      144,561      237,823
</TABLE>

---------------
(1) Based on an aggregate of 1,913,979 options granted by us, during the fiscal
    year ended December 31, 1999, to our employees, including the named
    executive officers.

(2) Estimated values are computed by (i) multiplying the number of shares of
    common stock subject to a given option by the initial public offering price
    of $15 per share, and (ii) subtracting from that result the aggregate option
    exercise price.

(3) Potential realizable values are computed by (i) multiplying the number of
    shares of common stock subject to a given option by the initial public
    offering price of $15 per share, (ii) assuming that the aggregate stock
    value derived from that calculation compounds at the annual 5% or 10% rates
    shown in the table over the term of the options, and (iii) subtracting from
    that result the aggregate option exercise price. The potential realizable
    values set forth above do not take into account applicable tax and

                                       44
<PAGE>   47

    expense payments that may be associated with such option exercises. Actual
    realizable value, if any, will be dependent on the future price of the
    common stock on the actual date of exercise, which may be earlier than the
    stated expiration date. The 5% and 10% table above are mandated by the rules
    of the Securities and Exchange Commissions and do not represent our estimate
    or projection of the future price of the common stock on any date. There is
    no representation either express or implied that the stock appreciation
    rates for the common stock assumed for purposes of this table will actually
    be achieved.

FISCAL YEAR-END OPTION VALUES

     The following table sets forth for each of the named executive officers the
number and value of securities underlying unexercised stock options that were
held by the named executive officer as of December 31, 1999. No stock options
were exercised by any named executive officers during 1999.

<TABLE>
<CAPTION>
                                                    NUMBER OF SECURITIES
                                                         UNDERLYING               VALUE OF UNEXERCISED
                                                     UNEXERCISED OPTIONS          IN-THE-MONEY OPTIONS
                                                    AT DECEMBER 31, 1999         AT DECEMBER 31, 1999(1)
                                                 ---------------------------   ---------------------------
                                                 EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
                                                 -----------   -------------   -----------   -------------
<S>                                              <C>           <C>             <C>           <C>
Asghar D. Mostafa..............................      --                --          --                 --
Glen A. Hunt...................................      --            60,000          --         $  810,000
James R. Loehndorf, Jr. .......................      --                --          --                 --
Ronald S. Westernik............................      --                --          --                 --
Alexander H. Dobson............................      --           151,562          --          2,020,306
</TABLE>

---------------
(1) Options are "in-the-money" if the value of our common stock exceeds the
    exercise price of the options. There was no public trading market for common
    stock as of December 31, 1999. We have calculated the value of unexercised
    in-the-money options at fiscal year-end on the basis of the initial public
    offering price of $15 per share, less the aggregate exercise price.

STOCK OPTION PLANS

     2000 STOCK INCENTIVE PLAN

     Our board of directors adopted the Advanced Switching Communications, Inc.
2000 Stock Incentive Plan in August 2000, subject to stockholder approval. The
purpose of the 2000 Stock Incentive Plan is to provide an incentive to our
employees, officers, consultants and directors and advisors through the granting
or awarding of incentive and nonqualified stock options, stock appreciation and
dividend equivalent rights, restricted stock, performance units, performance
shares, shares awards and phantom stock awards.

     Share Reserve.  We have authorized 6,000,000 shares of common stock for
issuance under the 2000 Stock Incentive Plan for the grant of stock options and
other incentive awards to eligible individuals.

     Eligibility.  Employees, officers, consultants and directors and advisors
of our company are eligible to receive awards under the 2000 Stock Incentive
Plan.

     Administration.  The 2000 Stock Incentive Plan will be administered by our
board of directors or by a committee, which will consist of non-employee
directors. Under the 2000 Stock Incentive Plan, the committee will have the
authority to, among other things:

     - select the employees to whom stock options and other incentive awards
       will be granted;

     - determine the type, size and the terms and conditions of stock options
       and other incentive awards; and

     - establish the terms for treatment of stock options and other incentive
       awards upon termination of employment or change in control.

     Termination or Amendment.  The 2000 Stock Incentive Plan will terminate on
the day preceding the tenth anniversary of the date of its adoption by the board
of directors. The board of directors will be able to at any time and from time
to time amend or terminate the 2000 Stock Incentive Plan; provided, however,
that, to the extent necessary under applicable law, no such change will be
effective without the requisite approval of the stockholders. In addition, no
such change will alter or adversely impair any rights or obligations under any
stock option and other incentive awards previously granted, except with the
written consent of the grantee.

                                       45
<PAGE>   48

     Acceleration of Vesting.  In the event of a change in control, or upon such
other events as may be determined by the committee, the committee may provide,
in its sole discretion, that each outstanding option will immediately become
fully exercisable with respect to the total number of shares subject to the
option and each outstanding incentive award will immediately become fully
vested. Additionally, if within one year following a change in control, the
successor corporation terminates the employee other than for cause or the
employee resigns for certain specified reasons, all of his or her options and
awards will become vested upon the termination of his or her employment.

     Change in Control.  A change in control occurs when (i) any person acquires
beneficial ownership of 50% or more of the company's voting securities; (ii) the
identity of more than a majority of members of the board of directors of the
company changes, unless the election of the new directors was approved by at
least a majority of the directors who were either directors when the plan was
adopted or whose election was approved by such directors; or (iii) the
consummation of certain mergers, consolidations or reorganizations, an agreement
for the sale of all or substantially all of the company's assets or a complete
liquidation or dissolution of the company occurs.

     OTHER STOCK OPTION PLANS

     Since inception, we have granted stock options pursuant to three stock
option plans:

     - 1999 Nonqualified Stock Option Plan;

     - Second 1998 Nonqualified Stock Option Plan; and

     - 1998 Nonqualified Stock Option Plan.

Each of these plans is subject to the following terms:

     Eligibility.  Our key personnel, including directors or officers, are
eligible to receive awards under each stock plan.

     Administration.  Our compensation committee administers each stock plan.
The compensation committee is appointed by our board of directors and is
composed of three members of our board of directors. The compensation committee
is responsible for the operation of the plans and makes recommendations to our
board of directors with respect to who may participate in the plans and the
extent of their participation. Upon recommendation of the compensation committee
and subject to any applicable limitations contained in the plans, our board of
directors selects the recipients of awards and determines:

     - the exercise price of options; and

     - the duration of options.

     Our board of directors authorizes the options granted under the stock
plans. Our board of directors may require that any shares purchased by an
optionee under each plan be subject to the terms of a stockholders' agreement or
that the optionee remain employed by, or render services to, our company.

     Options.  The plans provide for nonstatutory stock options to purchase
shares of our common stock. Optionees receive the right to purchase a specified
number of shares of common stock at a specified option price and subject to such
other terms and conditions as are specified in connection with the option grant.
Optionees must pay the exercise price in full in cash at the time an option is
exercised under the plan. Options can be exercised in whole or in part. If an
optionee ceases to be an employee, officer or director of our company, other
than due to retirement or death, any options granted under the plans shall
terminate immediately.

     Termination or Amendment.  No award may be granted under the plans after
the tenth anniversary of the effective date, but the vesting and effectiveness
of the awards previously granted may extend beyond that date. No award under the
plans, however, may be exercised after the tenth anniversary of the grant. Our
board of directors may at any time terminate, amend or revise the stock plans
with respect to any shares as to which options have not been granted and within
three months after termination of employment if the optionee engages in
activities contrary to the best interests of our company.

                                       46
<PAGE>   49

     1999 NONQUALIFIED STOCK OPTION PLAN

     Share Reserve.  In 1999, our board of directors approved our 1999
Nonqualified Stock Option Plan, which was amended on February 2, 2000 and March
21, 2000. We reserved 4,498,000 shares under our amended 1999 plan. As of June
30, 2000, we granted 1,332,617 options under the 1999 plan. Upon the adoption of
the 2000 plan, we will not make any further awards under the 1999 plan.

     Acceleration of Vesting.  Under the plan, in the event of the liquidation
or dissolution of our company, or upon such other event as may be determined by
the stock option committee, each outstanding option will immediately become
fully exercisable with respect to the total number of shares subject to the
option.

     Change in Control.  If following a transaction resulting in a change in
control the successor corporation terminates the employee other than for cause
or the employee resigns for certain specified reasons, all of his or her options
will become vested upon the termination date of his or her employment.

     SECOND 1998 NONQUALIFIED STOCK OPTION PLAN

     Share Reserve.  On July 31, 1998, our board of directors adopted our Second
1998 Nonqualified Stock Option Plan, which was amended on August 31, 1998 and
September 28, 1999. We reserved 2,216,000 shares under the second 1998 plan and
granted 2,572,979 options to purchase shares. The options granted under the
second 1998 plan were in excess of the amount of shares reserved due to
forfeitures of previous grants. Upon the adoption of the 1999 plan, no further
awards have been, or will be, made under the second 1998 plan.

     Acceleration of Vesting.  The second 1998 plan provides that in the event
of the: (i) consummation of a merger or consolidation in which our company is
not the surviving entity, (ii) consummation of a sale of more than 50% of the
outstanding common stock to persons who are not shareholders of our company on
the date of the grant, or (iii) liquidation or dissolution of our company, each
outstanding option will immediately become fully exercisable with respect to the
total number of shares subject to the option.

     1998 NONQUALIFIED STOCK OPTION PLAN

     Share Reserve.  On February 3, 1998, our board of directors adopted our
1998 Nonqualified Stock Option Plan. We reserved 2,000,000 shares under the 1998
plan and granted 982,000 options to purchase shares. Upon the adoption of the
second 1998 plan, no further awards have been, or will be, made under the 1998
plan.

     Acceleration of Vesting.  Each outstanding option granted under the 1998
plan will immediately become fully exercisable with respect to the total number
of shares subject to the option upon the: (i) consummation of a merger or
consolidation in which our company is not the surviving entity, (ii)
consummation of a sale of more than 50% of the outstanding common stock to
persons who are not shareholders of our company on the date of the grant, (iii)
liquidation or dissolution of our company, or (iv) effectiveness of a
registration statement providing for the initial offering of our shares to the
public.

401(k)PLAN

     We have established a tax-qualified employee savings and retirement plan
commonly known as a 401(k) plan. The 401(k) plan provides that each participant
may contribute up to 15% of his or her pre-tax gross compensation (up to the
annual statutory limit). We may make profit sharing contributions in our
discretion as determined annually by our board of directors. Employer
contributions to the plan vest according to a schedule entitling full vesting
after four years. We have not made any company contributions to the plan since
inception.

EMPLOYMENT AGREEMENTS

     Asghar D. Mostafa.  On August 31, 1998, we entered into an executive
employment agreement with Mr. Mostafa, our Chief Executive Officer and President
and Chairman of our board of directors, which continues indefinitely unless
terminated in accordance with the agreement. The employment agreement provides
that we may terminate Mr. Mostafa's employment at any time with cause. Mr.
Mostafa may terminate the employment agreement without cause or for good reason
upon sixty days written notice to us. In addition, the employment agreement will
terminate automatically upon Mr. Mostafa's death or disability.

                                       47
<PAGE>   50

     Under his employment agreement, Mr. Mostafa's base salary was initially
$150,000 per year. Upon the achievement of milestones related to product
shipments, which have already been achieved, Mr. Mostafa's annual base salary
was increased to $200,000. Mr. Mostafa's base salary may also be increased
annually upon approval of a majority of our board of directors. In addition to a
base salary, Mr. Mostafa receives bonuses determined, upon recommendation of our
compensation committee, by the consent of a majority of our board of directors.

     The employment agreement provides that if Mr. Mostafa's employment is
terminated upon death or disability or if he resigns because of a material
diminution of his responsibilities and duties, assignment to commute a distance
substantially greater than he currently commutes, a decrease in his salary, a
purported termination or any termination within 60 days following a change in
control, Mr. Mostafa is entitled to continue to receive all benefits under the
employment agreement for a period of two years. In addition, if Mr. Mostafa
resigns for the reasons described above, he is entitled to a severance payment
to be paid in 24 equal monthly installments in an amount equal to:

     - three years of his base salary at the time of termination, assuming
       minimum increases;

     - two times the average aggregate bonuses previously paid to him pursuant
       to his employment agreement; and

     - any deferred compensation or accrued vacation time.

     Mr. Mostafa's agreement contains restrictive covenants requiring
non-disclosure of our proprietary information and restricting him from competing
with us or soliciting our employees and customers for a two year period after
termination of his employment.

     Other Named Executive Officers.  We have entered into key employee
employment agreements with each of Ronald S. Westernik, James R. Loehndorf, Jr.,
Glen A. Hunt and Alexander H. Dobson under which these officers are entitled to
annual base salaries of $100,000, $100,000, $145,000 and $95,000, respectively.
Each agreement has a term of three years. Under these agreements, in addition to
his base salary, each officer receives:

     - bonuses as determined by our board of directors or our chief executive
       officer;

     - payment of necessary business expenses; and

     - benefits that are made available to our other employees including medical
       and permanent disability insurance.

     Each agreement contains restrictive covenants requiring each of the named
executive officers to disclose, assign and transfer to us all work product and
intellectual property created by him during his employment with us and
restricting him from competing with us and soliciting our employees and
customers for a two year period after termination of his employment.

     Each agreement provides that we may terminate the executive officer at any
time with cause and, upon two weeks written notice and the consent of our board
of directors, without cause. Each named executive officer may terminate his
employment agreement upon two weeks written notice.

                                       48
<PAGE>   51

                              CERTAIN TRANSACTIONS

COMMON STOCK ISSUANCES

     On December 9, 1997, we issued and sold an aggregate of 9,100,000 shares of
common stock to our co-founders, Asghar D. Mostafa, Ronald S. Westernik and
James R. Loehndorf, Jr. for a total purchase price of $162,435, or approximately
$0.018 per share.

     KEY EMPLOYEE STOCK AGREEMENTS

     We entered into key employee stock agreements with some of our officers and
employees, including Ronald S. Westernik and James R. Loehndorf, Jr. in
connection with our issuance of common stock to these employees.

     Repurchase Rights.  Under the key employee stock agreements, we are
entitled to repurchase all, but not less than all, of the shares of common stock
owned by the employee if the employee:

     - is terminated for cause;

     - commits or permits unauthorized transfers of any of his or her shares; or

     - terminates his or her employment without cause.

Our repurchase rights will terminate:

     - with respect to 50% of the shares, upon the completion of this offering;

     - with respect to another 25% of the shares, six months after the
       completion of this offering; and

     - with respect to the remaining 25%, one year after the completion of this
       offering.

     Right of First Refusal.  If the employee receives an offer from a third
party to purchase his or her shares, the employee must notify us and offer to
sell those shares to us. We have the right to repurchase these shares within 60
days of receipt of the notice. If we choose not to repurchase the shares, the
employee is free to consummate the sale with a third party. Our right to
repurchase these shares terminates:

     - with respect to 50% of the shares, upon the completion of this offering;

     - with respect to another 25% of the shares, six months after the
       completion of this offering; and

     - with respect to the remaining 25%, one year after the completion of this
       offering.

     STOCKHOLDERS AGREEMENT

     In 1998, we entered into stockholders agreements with Asghar D. Mostafa and
Mostafa Investments Limited Partnership. The agreements provide that, in the
event of Mr. Mostafa's death, all shares owned by Mr. Mostafa and Mostafa
Investments Limited Partnership will be sold to us at a price equal to the
greater of (1) the proceeds of life insurance policies owned by us naming Mr.
Mostafa as the insured or owned by us for the purpose of repurchasing these
shares or (2) the appraised value of the shares. If Mr. Mostafa or Mostafa
Investments Limited Partnership transfers the shares or the stockholders
agreements terminate, Mr. Mostafa will have the right to purchase from us any
life insurance policies naming him as the insured for an amount equal to the
greater of (1) the cash value of the policies, (2) the unearned premiums on the
policies or (3) $1.00. If Mr. Mostafa is permanently disabled or terminates his
employment with us for any reason, Mr. Mostafa or Mostafa Investments Limited
Partnership may cause us to repurchase all of the shares within 180 days at the
value of the shares determined as of the last day of the month preceding the
date he exercises this right. These stockholders agreements will terminate upon
the closing of this offering.

PREFERRED STOCK ISSUANCES

     Since 1998, we have issued and sold shares of convertible redeemable
preferred stock to the following persons and entities who are our executive
officers, directors or principal stockholders. Upon the closing of the

                                       49
<PAGE>   52

offering, each share of preferred stock will convert into shares of our common
stock. For more detail on shares held by these investors, see "Principal
Stockholders."

<TABLE>
<CAPTION>
                                        PREFERRED STOCK                    TOTAL SHARES    CONSIDERATION
                                       -----------------       TOTAL         OF COMMON      PER COMMON
                                        NUMBER             CONSIDERATION     STOCK AS          SHARE
              INVESTOR                 OF SHARES   CLASS    PAID TO ASC    CONVERTED (1)    EQUIVALENT
              --------                 ---------   -----   -------------   -------------   -------------
<S>                                    <C>         <C>     <C>             <C>             <C>
Asghar D. Mostafa (2)................      9,428     A      $2,357,000         632,544         $4.28
                                           8,800(3)  B       2,200,000       2,524,003          1.00
                                         292,412     D       2,500,123         634,301          4.28
Ronald S. Westernik..................        100     A          25,000           6,709          4.28
                                             400     B         100,000         114,727          1.00
James R. Loehndorf, Jr...............        240     B          60,000          68,836          1.00
John W. Seazholtz....................        240     B          60,000          68,836          1.00
Baker Communications Fund, L.P.......  3,989,270     C      10,400,000       9,063,260          1.36
                                         292,412     D       2,500,123         634,302          4.28
New Enterprise Associates (4)........  1,462,061     D      12,500,621       3,171,511          4.28
Technology Crossover Ventures (5)....  1,462,061     D      12,500,621       3,171,511          4.28
Robert Ted Enloe, III................     67,567     E         500,000          68,929          7.40
</TABLE>

---------------
(1) Represents the number of shares of common stock issuable upon conversion of
    the preferred stock as of September 30, 2000. The amount of common stock
    issuable upon conversion of the preferred stock will increase as dividends
    continue to accrue on the preferred stock.

(2) Represents shares originally purchased by Mostafa Investment Limited
    Partnership and presently owned by Mostafa Venture Fund, LLC, both of which
    are controlled by Asghar D. Mostafa.

(3) Asghar D. Mostafa originally purchased 8,800 shares of Class B preferred
    stock in June 1998, and subsequently sold 4,091 of these shares to Baker
    Communications on September 10, 1999. The shares in the table are shown
    before giving effect to this transfer.

(4) New Enterprise Associates includes the following entities managed by NEA
    Partners VIII and NEA General Partners, L.P.: New Enterprise Associates
    VIII, L.P., NEA Presidents' Fund, L.P. and NEA Ventures 1999, L.P.

(5) Technology Crossover Ventures includes the following entities managed by
    Technology Crossover Management III, L.L.C.: TCV III (GP), TCV III, L.P.,
    TCV III (Q), L.P., and TCV III Strategic Partners, L.P.

     Class A Preferred Stock.  In 1998, we issued an aggregate of 9,528 shares
of Class A preferred stock to Asghar D. Mostafa and Ronald S. Westernik. The per
share price for our Class A preferred stock was $250 which was paid through the
conversion of loans.

     Class B Preferred Stock.  In 1998, we issued an aggregate of 10,960 shares
of Class B preferred stock to 15 investors, including Asghar D. Mostafa, Ronald
S. Westernik, James R. Loehndorf, Jr. and John Seazholtz. The per share purchase
price for our Class B preferred stock was $250. On September 10, 1999, Asghar D.
Mostafa sold 4,091 shares of Class B preferred stock to Baker Communications
Fund, L.P. at a per share purchase price of $338.96.

     Class C Preferred Stock.  In 1998 and 1999, we issued an aggregate of
3,835,286 shares of Class C preferred stock to Baker Communications Fund, L.P.
for a purchase price of $2.71 per share, a portion of which was paid through the
conversion of a loan. On September 10, 1999, we issued an additional 153,984
shares of Class C preferred stock to Baker Communications Fund, L.P. in
consideration of Baker's agreement to forego its right to receive additional
common shares upon conversion of the Class A shares.

     Class D Preferred Stock.  On September 10, 1999 and October 10, 1999, we
issued in two tranches an aggregate of 4,678,594 shares of Class D preferred
stock to 13 investors, including Asghar Mostafa, Baker Communications Fund, L.P.
and entities affiliated with New Enterprise Associates, Technology Crossover
Ventures and Morgan Stanley & Co. Incorporated. The per share purchase price for
our Class D preferred

                                       50
<PAGE>   53

stock was $8.55 which, with respect to Mr. Mostafa and Baker Communications, was
paid through the conversion of loans.

     Class E Preferred Stock.  On June 30, 2000, we issued 67,567 shares of
Class E preferred stock to Robert Ted Enloe, III for a purchase price of
$500,000 or $7.40 per share.

RELATIONSHIPS AMONG OFFICERS AND DIRECTORS WITH CERTAIN INVESTORS

     Four of our directors are partners in entities that own more than five
percent of our capital stock. Henry G. Baker and Edward W. Scott are general
partners of Baker Communications Fund, L.P., Richard H. Kimball is a general
partner of Technology Crossover Ventures and Arthur J. Marks is a general
partner of New Enterprise Associates.

LOANS FROM EXECUTIVE OFFICERS AND STOCKHOLDERS

     Between October 7, 1997 and September 7, 1999, we borrowed an aggregate of
approximately $11.4 million from Asghar D. Mostafa, Ronald S. Westernik, James
H. Loehndorf, Jr., and Baker Communications Fund, L.P. Each of these loans was
evidenced by an interest-bearing promissory note and was ultimately paid in full
or converted into shares of our convertible preferred stock, as set forth in the
table below.

<TABLE>
<CAPTION>
                                                 LOANS                 CONVERSION INTO PREFERRED STOCK
                                    --------------------------------   -------------------------------
              LENDER                 DATE       AMOUNT     INT. RATE     DATE       CLASS     SHARES
              ------                -------   ----------   ---------   --------     ------  ----------
<S>                                 <C>       <C>          <C>         <C>          <C>     <C>
Asghar D. Mostafa.................  10/7/97   $  107,143      6.5%     6/26/98        A           428
                                     2/6/98      250,000      6.5      6/26/98        A         1,000
                                     3/9/98    1,750,000      6.5      6/26/98        A         7,000
                                    6/11/98      250,000      6.5      6/26/98        A         1,000
                                    4/20/99    1,000,000      5.0           --(1)    --            --
                                     9/7/99    2,500,000      5.0      9/10/99        D       292,412
Ronald S. Westernik...............  12/5/97       25,000      6.5      6/26/98        A           100
James R. Loehndorf, Jr.(2)........  12/5/97       12,500      6.5           --       --            --
Baker Communications Fund, L.P....  4/20/99    3,000,000      5.0      6/30/99        C     1,106,332
                                     9/7/99    2,500,000      5.0      9/10/99        D       292,412
</TABLE>

---------------
(1) This promissory note was cancelled and the principal amount was included in
    the $2,500,000 loan made to us by Mr. Mostafa on September 7, 1999.

(2) We repaid this loan in full together with accrued interest on July 7, 1998.

OPTION GRANTS

     In the past, we have granted options to our executive officers and
directors. We intend to grant additional options to our executive officers and
directors in the future. See "Management -- Option Grants in Last Fiscal Year."

INDEMNIFICATION AGREEMENT

     On September 19, 1997, we entered into an indemnification agreement with
Asghar D. Mostafa. Under this agreement, Mr. Mostafa agreed to provide
securities valued at $1.3 million as collateral to a bank in order to induce the
bank to issue a standby letter of credit in favor of our landlord. In return, we
agreed to indemnify Mr. Mostafa against any and all losses related to the lease
and agreed to give Mr. Mostafa a first priority security interest in our
intellectual property. In 1999, we provided substitute collateral for the letter
of credit. Accordingly, the indemnification agreement and the security interest
have been terminated.

                                       51
<PAGE>   54

INDEMNIFICATION AND LIMITATION OF DIRECTOR AND OFFICER LIABILITY

     We have entered into indemnification agreements with our directors for the
indemnification of and advancement of expenses to such persons to the full
extent permitted by law. We also intend to execute such agreements with our
future directors.

     We believe that the transactions set forth above were made on terms no less
favorable to us and at least as beneficial for us as could have been obtained
from unaffiliated third parties. All future transactions, including loans
between us and our officers, directors, principal stockholders and their
affiliates will be approved by a majority of the board of directors, and will
continue to be on terms no less favorable to us than could be obtained from
unaffiliated third parties.

                                       52
<PAGE>   55

                             PRINCIPAL STOCKHOLDERS

     The following table sets forth certain information concerning the
beneficial ownership of our common stock as of September 30, 2000, and as
adjusted to reflect the sale of the shares of common stock in this offering by:

     - each person who is known by us to beneficially own more then 5% of our
       common stock;

     - each of our named executive officers;

     - each of our directors; and

     - all officers and directors as a group.

     Unless otherwise indicated, the address of each listed stockholder is c/o
Advanced Switching Communications, Inc., 8330 Boone Boulevard, 8th Floor,
Vienna, Virginia 22182. The number and percentage of shares beneficially owned
are based on 34,865,883 shares of common stock outstanding as of September 30,
2000, assuming conversion of all outstanding shares of preferred stock into
common stock, and an additional 6,250,000 shares of common stock outstanding
after the completion of this offering, assuming the underwriters' over-allotment
option to purchase 937,500 shares of common stock is not exercised. Beneficial
ownership is determined under the rules and regulations of the Securities and
Exchange Commission. Shares of common stock subject to options or warrants that
are currently exercisable or exercisable within 60 days of September 30, 2000
are deemed to be outstanding and beneficially owned by the person holding the
options or warrants for the purpose of computing the number of shares
beneficially owned and the percentage ownership of that person. The shares
subject to options or warrants held by a person are not deemed to be outstanding
for the purpose of computing the percentage ownership of any other person.
Except as indicated in the footnotes to this table, and subject to applicable
community property laws, the persons named in the table have sole voting and
investment power with respect to all shares of our common stock shown as
beneficially owned by them. Percentage ownership figures after the offering do
not include shares that may be purchased by each person in the offering. Entries
denoted by an asterisk represent an amount less than 1%.

<TABLE>
<CAPTION>
                                                                                   PERCENT OF SHARES
                                                             NUMBER OF SHARES     BENEFICIALLY OWNED
                                                               BENEFICIALLY     -----------------------
                                                             OWNED BEFORE THE   BEFORE THE    AFTER THE
 NAME AND ADDRESS OF OFFICER, DIRECTOR OR BENEFICIAL OWNER       OFFERING        OFFERING     OFFERING
 ---------------------------------------------------------   ----------------   -----------   ---------
<S>                                                          <C>                <C>           <C>
Asghar D. Mostafa(1).......................................     10,617,474         30.5%        25.8%
Baker Communications Fund, L.P.............................     10,870,936         31.2         26.4
  c/o Baker Capital Partners, LLC
  540 Madison Avenue
  New York, NY 10022
New Enterprise Associates(2)...............................      3,171,511          9.1          7.7
  11951 Freedom Drive
  One Freedom Square, Suite 1240
  Reston, VA 20190
Technology Crossover Ventures(3)...........................      3,171,511          9.1          7.7
  575 High Street
  Palo Alto, CA 94301
Ronald S. Westernik........................................        721,437          2.1          1.8
James R. Loehndorf, Jr.....................................        568,836          1.6          1.4
Alexander Dobson...........................................         36,279            *            *
Glen A. Hunt...............................................         15,000            *            *
Betsy S. Atkins............................................         23,111            *            *
Henry G. Baker(4)..........................................     10,870,936         31.2         26.4
  c/o Baker Capital Partners, LLC
  540 Madison Avenue
  New York, NY 10022
</TABLE>

                                       53
<PAGE>   56

<TABLE>
<CAPTION>
                                                                                   PERCENT OF SHARES
                                                             NUMBER OF SHARES     BENEFICIALLY OWNED
                                                               BENEFICIALLY     -----------------------
                                                             OWNED BEFORE THE   BEFORE THE    AFTER THE
 NAME AND ADDRESS OF OFFICER, DIRECTOR OR BENEFICIAL OWNER       OFFERING        OFFERING     OFFERING
 ---------------------------------------------------------   ----------------   -----------   ---------
<S>                                                          <C>                <C>           <C>
Robert Ted Enloe, III(5)...................................         68,929            *            *
  c/o Balquita Partners, Ltd.
  3102 Maple Avenue, Suite 200
  Dallas, TX 75201
Richard H. Kimball(3)......................................      3,171,511          9.1          7.7
  c/o Technology Crossover Ventures
  528 Ramona Street
  Palo Alto, CA 94301
Arthur J. Marks(2).........................................      3,171,511          9.1          7.7
  c/o New Enterprise Associates
  11951 Freedom Drive
  One Freedom Square, Suite 1240
  Reston, VA 20190
Edward W. Scott(4).........................................     10,870,936         31.2         26.4
  c/o Baker Capital Partners, LLC
  540 Madison Avenue
  New York, NY 10022
John W. Seazholtz(6).......................................        208,836            *            *
  399 Princeton Avenue
  Brick, NJ 08724
Directors and officers as a group (16 persons)(7)..........     29,275,470         84.1%        71.4
</TABLE>

---------------
(1) Includes 8,000,000 shares owned by Mostafa Investments Limited Partnership,
    an investment partnership controlled by Asghar D. Mostafa, and 2,564,280
    shares owned by Mostafa Venture Fund, LLC, an investment limited liability
    company controlled by Asghar D. Mostafa. Excludes 67,533 shares owned by Mr.
    Mostafa's brother, Iraj Mostafa, an employee of ASC.
(2) Represents shares held by New Enterprise Associates, which includes the
    following entities managed by NEA Partners VIII and NEA General Partners,
    L.P.: New Enterprise Associates VIII, L.P., NEA Presidents' Fund, L.P. and
    NEA Ventures 1999, L.P. The following natural persons exercise voting and/or
    dispositive powers for the shares held by New Enterprise Associates: Arthur
    J. Marks, Charles Newhall, John Nehra, Nancy Dorman, Peter Barris, Dick
    Kramlich, Mark Perry, Peter Morris, Ron Case and Tom McConnell. Arthur. J.
    Marks, a member of our board of directors, is a general partner of NEA
    Partners VIII, which is the general partner of New Enterprise Associates
    VIII, L.P., and of NEA General Partners L.P., which is the general partner
    of NEA Presidents' Fund, L.P. Mr. Marks disclaims beneficial ownership of
    these shares, except to the extent of his pecuniary interest therein.
(3) Represents shares held by TCV III (GP), TCV III, L.P., TCV III (Q), L.P.,
    and TCV III Strategic Partners, L.P. (collectively, the "TCV Funds"). Mr.
    Kimball, a director of the Company, is a Managing Member of Technology
    Crossover Management III, L.L.C. which is the General Partner of each of the
    TCV Funds. Mr. Kimball may be deemed to have sole dispositive power and
    shared voting power with respect to the securities held by the TCV Funds.
    Mr. Kimball disclaims beneficial ownership of such shares except to the
    extent of his pecuniary interest therein. The address for each of these
    persons and entities is c/o Technology Crossover Ventures, 528 Ramona
    Street, Palo Alto, California 94301.
(4) Represents shares held by Baker Communications Fund, L.P. Baker Capital
    Partners, LLC is the general partner of Baker Communications Fund, L.P.
    Henry G. Baker and Edward W. Scott, members of our board of directors, are
    members of Baker Capital Partners, LLC. Each of Mr. Baker and Mr. Scott
    disclaims beneficial ownership of these shares, except to the extent of his
    pecuniary interest therein. The following natural persons jointly, but not
    individually, exercise voting and/or dispositive power with respect to the
    shares held by Baker Communications Fund, L.P.: John C. Baker; Larry A.
    Bettino; Ashley Leeds; Edward W. Scott and Henry G. Baker.
(5) Represents shares held by Balquita Partners, Ltd., a limited partnership
    controlled by Mr. Enloe.
(6) Includes 140,000 shares issuable upon the exercise of options granted under
    our stock option plans.
(7) Excludes 408,390 shares issuable upon the exercise of options granted under
    our stock option plans.

                                       54
<PAGE>   57

                           DESCRIPTION OF SECURITIES

     After this offering, our authorized capital stock will consist of
250,000,000 shares of common stock, $.0025 par value per share, and 10,000,000
shares of preferred stock, $.01 par value per share. As of September 30, 2000,
there were outstanding:

     - 34,865,883 shares of common stock held by 57 stockholders of record,
       assuming the conversion into common stock of all outstanding shares of
       redeemable convertible preferred stock; and

     - options to purchase an aggregate of 5,422,245 shares of common stock.

     Based upon the number of shares outstanding as of that date, and giving
effect to the issuance of the shares of common stock offered by us in this
offering, there will be 41,115,883 shares of our common stock outstanding upon
the closing of this offering.

     The descriptions of common stock and preferred stock reflect changes to our
capital structure that will occur upon the closing of this offering in
accordance with the amended and restated certificate of incorporation that we
will adopt immediately prior to the closing of this offering.

COMMON STOCK

     Holders of common stock are entitled to one vote for each share held on all
matters submitted to a vote of stockholders and do not have cumulative voting
rights. Accordingly, holders of a majority of the shares of common stock
entitled to vote in any election of directors may elect all of the directors
standing for election. Holders of common stock are entitled to receive
proportionately any such dividends declared by the board of directors, subject
to any preferential dividend rights of outstanding preferred stock. Upon the
liquidation, dissolution or winding up of our company, the holders of common
stock are entitled to receive ratably our net assets available after the payment
of all debts and other liabilities and subject to the prior rights of any
outstanding preferred stock. Holders of common stock have no preemptive,
subscription, redemption or conversion rights. The rights, preferences and
privileges of holders of common stock are subject to the rights of the holders
of shares of any series of preferred stock which we may designate and issue in
the future. Certain holders of common stock have the right to require us to
register their shares of common stock under the Securities Act in certain
circumstances. See "Shares Eligible for Future Sale."

PREFERRED STOCK

     The board of directors is authorized to issue shares of preferred stock in
one or more series without stockholder approval. The board has discretion to
determine the rights, preferences, privileges and restrictions, including voting
rights, dividend rights, conversion rights, redemption privileges and
liquidation preferences of each series of preferred stock. The purpose of
authorizing the board of directors to issue preferred stock and determine its
rights and preferences is to eliminate delays associated with a stockholder vote
on specific issuances. The issuance of preferred stock, while providing
desirable flexibility in connection with possible acquisitions and other
corporate purposes, could make it more difficult for a third party to acquire,
or could discourage a third party from acquiring, a majority of our outstanding
voting stock. We have no present plans to issue any shares of preferred stock.

WARRANTS

     On March 10, 2000, we issued to one of our customers a warrant to purchase
125,000 shares of common stock at an exercise price of $15.00 per share. This
warrant was amended and restated on June 30, 2000. The warrant has vested, and
if not sooner exercised, this warrant will remain outstanding until June 30,
2007. The warrant may be exercised earlier depending on the timing and amount of
products purchased.

     On June 21, 2000, we issued to one of our customers a warrant to purchase
222,000 shares of common stock at an exercise price of $8.00 per share. The
warrant vested immediately upon issuance and is exercisable at any time until
June 21, 2003.

     On August 25, 2000, we issued to one of our vendors a warrant to purchase
12,500 shares of common stock at an exercise price of $13.00 per share. The
warrant vested immediately upon issuance and is exercisable until August 25,
2003.

                                       55
<PAGE>   58

DELAWARE LAW AND CERTAIN CHARTER AND BY-LAW PROVISIONS; ANTI-TAKEOVER EFFECTS

     We are subject to the provisions of Section 203 of the General Corporation
Law of Delaware. In general, the statute prohibits a publicly held Delaware
corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years after the date of the transaction in
which the person became an interested stockholder, unless the business
combination is approved in a prescribed manner. A "business combination"
includes mergers, asset sales and other transactions resulting in a financial
benefit to the interested stockholder. Subject to certain exceptions, an
"interested stockholder" is a person who, together with affiliates and
associates, owns, or within three years did own, 15% or more of the
corporation's voting stock. The amended and restated certificate of
incorporation and amended and restated by-laws to be effective on the closing of
this offering provide:

     - that the board of directors be divided into three classes, as nearly
       equal in size as possible, with staggered three-year terms;

     - that directors may be removed only for cause by the affirmative vote of
       the holders of two-thirds of the shares of our capital stock entitled to
       vote; and

     - that any vacancy on the board of directors, however occurring, including
       a vacancy resulting from an enlargement of the board, may only be filled
       by vote of the directors then in office.

     The classification of the board of directors and the limitations on the
removal of directors and filling of vacancies could have the effect of making it
more difficult for a third party to acquire, or of discouraging a third party
from acquiring, us.

     The amended and restated certificate of incorporation and amended and
restated by-laws, both effective upon the closing of this offering, also provide
that, after the closing of this offering:

     - any action required or permitted to be taken by the stockholders at an
       annual meeting or special meeting of stockholders may only be taken if it
       is properly brought before such meeting and may not be taken by written
       action in lieu of a meeting; and

     - special meetings of the stockholders may only be called by the board of
       directors.

     Our amended and restated by-laws, effective upon the closing of this
offering, provide that, in order for any matter to be considered "properly
brought" before a meeting, a stockholder must comply with requirements regarding
advance notice to us. These provisions could delay until the next stockholders'
meeting stockholder actions which are favored by the holders of a majority of
our outstanding voting securities. These provisions may also discourage another
person or entity from making a tender offer for our common stock, because such
person or entity, even if it acquired a majority of our outstanding voting
securities, would be able to take action as a stockholder (such as electing new
directors or approving a merger) only at a duly called stockholders meeting, and
not by written consent. Delaware's corporation law provides generally that the
affirmative vote of a majority of the shares entitled to vote on any matter is
required to amend a corporation's certificate of incorporation or by-laws,
unless a corporation's certificate of incorporation or by-laws, as the case may
be, requires a greater percentage. Our amended and restated certificate of
incorporation, effective upon the closing of this offering, permits the board of
directors to amend or repeal our by-laws by majority vote but requires the
affirmative vote of the holders of at least 66 2/3% of the shares of our capital
stock entitled to vote to amend or repeal any of the provisions of our amended
and restated by-laws. Generally, our amended and restated certificate of
incorporation, effective upon the closing of this offering, may be amended by
holders of a majority of the shares of our capital stock issued and outstanding
and entitled to vote. The stockholder vote with respect to our certificate of
incorporation or by-laws, as amended and restated upon the closing of this
offering, would be in addition to any separate class vote that might in the
future be required pursuant to the terms of any series preferred stock that
might be outstanding at the time any such amendments are submitted to
stockholders.

                                       56
<PAGE>   59

LIMITATION OF LIABILITY AND INDEMNIFICATION

     Our amended and restated certificate of incorporation, effective upon the
closing of this offering, provides that our directors and officers shall be
indemnified by us to the fullest extent authorized by Delaware law. This
indemnification would cover all expenses and liabilities reasonably incurred in
connection with their services for or on behalf of us. In addition, our amended
and restated certificate of incorporation, effective upon the closing of this
offering, provides that our directors will not be personally liable for monetary
damages to us for breaches of their fiduciary duty as directors, unless they
violated their duty of loyalty to us or our stockholders, acted in bad faith,
knowingly or intentionally violated the law, authorized illegal dividends or
redemptions or derived an improper personal benefit from their action as
directors.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for the common stock is American Stock
Transfer & Trust Company.

                                       57
<PAGE>   60

                        SHARES ELIGIBLE FOR FUTURE SALE

     Based on shares outstanding as of September 30, 2000, upon completion of
this offering, we will have 41,115,883 shares of common stock outstanding
(assuming no exercise of outstanding options). See "Prospectus Summary -- The
Offering" on page 3 for a detailed discussion of shares included and excluded
from this number. Of these shares, the 6,250,000 shares sold in this offering
will be freely tradable without restriction or further registration under the
Securities Act of 1933, as amended, except that any shares purchased by our
affiliates, as that term is defined in Rule 144 under the Securities Act, may
generally only be sold in compliance with the limitations of Rule 144 described
below. The remaining 34,865,883 shares of common stock held by existing
stockholders were issued and sold by us in reliance on exemptions from the
registration requirements of the Securities Act. Of these shares, 34,786,383
shares will be subject to "lock-up" agreements described below on the effective
date of this offering. Upon expiration of the lock-up agreements, these shares
will become eligible for sale subject in most cases to the limitations of either
Rule 144 or Rule 701. In addition, holders of stock options could exercise such
options and sell certain of the shares issued upon exercise as described below
under "Stock Options".

SALES OF RESTRICTED SHARES

<TABLE>
<CAPTION>
       DAYS AFTER DATE OF            APPROXIMATE SHARES
        THIS PROSPECTUS           ELIGIBLE FOR FUTURE SALE                       COMMENT
       ------------------         ------------------------                       -------
<S>                               <C>                        <C>
90 days after effectiveness.....             79,500          Eligible for sale under Rule 144 or Rule 701
180 days after effectiveness....         34,786,383          Eligible for sale upon expiration of lock-up
</TABLE>

     Certain of the shares listed in the foregoing table as not eligible for
sale until 180 days after effectiveness may become eligible for sale earlier as
described below under "Lock-up Agreements".

     In general, under Rule 144, a person (or persons whose shares are
aggregated), including an affiliate, who has beneficially owned shares for at
least one year is entitled to sell, within any three-month period, a number of
such shares that does not exceed the greater of (1) one percent of the then
outstanding shares of common stock (approximately 411,160 shares immediately
after this offering) or (2) the average weekly trading volume in the common
stock in the over-the-counter market during the four calendar weeks preceding
the date on which notice of such sale is filed, provided certain requirements
concerning availability of public information, manner of sale and notice of sale
are satisfied. In addition, our affiliates must comply with the restrictions and
requirements of Rule 144, other than the one-year holding period requirement, in
order to sell shares of common stock which are not restricted securities.

     Under Rule 144(k), a person who is not an affiliate and has not been an
affiliate for at least three months prior to the sale and who has beneficially
owned shares for at least two years may resell such shares without compliance
with the foregoing requirements. In meeting the one-and two-year holding periods
described above, a holder of shares can include the holding periods of a prior
owner who was not an affiliate. The one-and two-year holding periods described
above do not begin to run until the full purchase price or other consideration
is paid by the person acquiring the shares from the issuer or an affiliate. Rule
701 provides that currently outstanding shares of common stock acquired under
our employee compensation plans, and shares of common stock acquired upon
exercise of presently outstanding options granted under these plans, may be
resold beginning 90 days after the date of this prospectus:

     - by persons, other than affiliates, subject only to the manner of sale
       provisions of Rule 144, and

     - by affiliates under Rule 144 without compliance with its one-year minimum
       holding period, subject to certain limitations.

STOCK OPTIONS

     At September 30, 2000, approximately 325,000 shares of common stock were
issuable pursuant to immediately exercisable options granted under our 1998
Nonqualified Stock Option Plan and the balance of the shares granted under our
1998 plan will vest automatically upon the closing of the offering.
Approximately 200,000 shares are not subject to lock-up agreements with the
underwriters. At September 30, 2000, approximately 398,200 shares of common
stock were issuable pursuant to immediately exercisable options granted under
our Second 1998 Nonqualified Stock Option Plan of which approximately 130,200
shares are

                                       58
<PAGE>   61

not subject to lock-up agreements with the underwriters. At September 30, 2000,
there were 23,333 shares of common stock issuable pursuant to immediately
exercisable options granted under the 1999 Nonqualified Stock Option Plan of
which 21,875 are not subject to lock-up agreements with the underwriters. At
September 30, 2000, there were 163,668 shares of common stock issuable pursuant
to immediately exercisable options granted under the 2000 Stock Incentive Plan
of which 3,556 are subject to lock-up agreements with the underwriter. We intend
to file a registration statement on Form S-8 under the Securities Act as soon as
practicable following the date of this prospectus, to register up to 4,139,532
shares of common stock issuable under our stock plans, including the 668,575
shares of common stock subject to immediately exercisable options as of
September 30, 2000. This registration statement is expected to become effective
upon filing.

LOCK-UP AGREEMENTS

     All officers and directors and certain stockholders holding an aggregate of
approximately 34,786,383 shares of our common stock have agreed, subject to
certain exceptions, not to offer, pledge, sell, contract to sell, sell any
option or contract to purchase, purchase any option or contract to sell, grant
any option, right or warrant to purchase, or otherwise transfer or dispose of,
directly or indirectly (or enter into any swap or other arrangement that
transfers to another, in whole or in part, any of the economic consequences of
ownership of), any shares of common stock or any securities convertible into or
exercisable or exchangeable for shares of common stock for a period of 180 days
after the date of this prospectus, without the prior written consent of Morgan
Stanley & Co. Incorporated. However, if the reported last sale price of the
common stock on the Nasdaq National Market is at least twice the initial public
offering price per share for 20 of the 30 trading days ending on the last
trading day preceding the 120th day after the date of this prospectus, 25% of
the shares of our common stock subject to the 180-day restriction described
above will be released from these restrictions provided that the stockholder is
not an executive officer of our company. The release of these shares will occur
on the later to occur of:

     - the 120th day after the date of this prospectus if we make our first
       post-offering public release of our quarterly or annual earnings results
       during the period beginning on the eleventh trading day after the date of
       this prospectus and ending on the day prior to the 120th day after the
       date of this prospectus; or

     - on the second trading day following the first public release of our
       quarterly or annual results occurring on or after the 120th day after the
       date of this prospectus, if we do not make our first post-offering public
       release as set forth in the preceding clause.

Morgan Stanley & Co. Incorporated may in its sole discretion choose to release
any or all of these shares from such restrictions prior to the expiration of
such 120- or 180-day period. However, Morgan Stanley & Co. Incorporated does not
have any current intention to release shares of common stock subject to lock-up
agreements. Any determination to release any shares subject to the lock-up
agreements would be based on a number of factors at the time of determination,
including the market price of the common stock, the liquidity of the trading
market for the common stock, general market conditions, the number of shares
proposed to be sold and the timing, purpose and terms of the proposed sale.

REGISTRATION RIGHTS

     After this offering, the holders of approximately 20,738,045 shares of
common stock will be entitled to rights with respect to the registration of such
shares under the Securities Act. Under the terms of the agreement between us and
the holders of such registrable securities, if we propose to register any of our
securities under the Securities Act, either for our own account or for the
account of other security holders exercising registration rights, such holders
are entitled to notice of such registration and are entitled to include shares
of such common stock therein. Additionally, such holders are also entitled to
demand registration rights pursuant to which they may require us on up to two
occasions to file a registration statement under the Securities Act at our
expense with respect to shares of our common stock, and we are required to use
our best efforts to effect such registration. Further, holders may require us to
file two additional registration statements on Form S-3 at our expense during
any one year period. All of these registration rights are subject to conditions
and limitations, among them the right of the underwriters of an offering to
limit the number of shares included in such registration.

                                       59
<PAGE>   62

          UNITED STATES TAX CONSEQUENCES TO NON-UNITED STATES HOLDERS

     The following is a general discussion of the principal United States
federal income and estate tax consequences of the ownership and disposition of
our common stock by a non-U.S. holder. As used in this discussion, the term
"non-U.S. holder" means a beneficial owner of our common stock that is not, for
U.S. federal income tax purposes:

     - an individual who is a citizen or resident of the United States;

     - a corporation or partnership created or organized in or under the laws of
       the United States or of any political subdivision of the United States,
       other than a partnership treated as foreign under U.S. Treasury
       regulations;

     - an estate whose income is includable in gross income for U.S. federal
       income tax purposes regardless of its source; or

     - a trust, in general, if a U.S. court is able to exercise primary
       supervision over the administration of the trust and one or more U.S.
       persons have authority to control all substantial decisions of the trust.

     An individual may be treated as a resident of the United States in any
calendar year for U.S. federal income tax purposes, instead of a nonresident,
by, among other ways, being present in the United States on at least 31 days in
that calendar year and for an aggregate of at least 183 days during a three-year
period ending in the current calendar year. For purposes of this calculation,
you would count all of the days present in the current year, one-third of the
days present in the immediately preceding year and one-sixth of the days present
in the second preceding year. Residents are taxed for U.S. federal income tax
purposes as if they were U.S. citizens.

     This discussion does not consider:

     - U.S. state and local or non-U.S. tax consequences;

     - specific facts and circumstances that may be relevant to a particular
       non-U.S. holder's tax position, including, if the non-U.S. holder is a
       partnership or trust that the U.S. tax consequences of holding and
       disposing of our common stock may be affected by certain determinations
       made at the partner or beneficiary level;

     - the tax consequences for the shareholders, partners or beneficiaries of a
       non-U.S. holder;

     - special tax rules that may apply to particular non-U.S. holders, such as
       financial institutions, insurance companies, tax-exempt organizations,
       U.S. expatriates, broker-dealers, and traders in securities; or

     - special tax rules that may apply to a non-U.S. holder that holds our
       common stock as part of a "straddle," "hedge," "conversion transaction,"
       "synthetic security" or other integrated investment.

     The following discussion is based on provisions of the U.S. Internal
Revenue Code of 1986, as amended, applicable existing and proposed U.S. Treasury
regulations and administrative and judicial interpretations, all as in effect on
the date of this prospectus, and all of which are subject to change,
retroactively or prospectively. The following summary assumes that a non-U.S.
holder holds our common stock as a capital asset. EACH NON-U.S. HOLDER SHOULD
CONSULT A TAX ADVISOR REGARDING THE U.S. FEDERAL, STATE, LOCAL AND NON-U.S.
INCOME AND OTHER TAX CONSEQUENCES OF ACQUIRING, HOLDING AND DISPOSING OF SHARES
OF OUR COMMON STOCK.

DIVIDENDS

     We do not anticipate paying cash dividends on our common stock in the
foreseeable future. See "Dividend Policy." In the event, however, that we pay
dividends on our common stock, we will have to withhold a U.S. federal
withholding tax at a rate of 30%, or a lower rate under an applicable income tax
treaty, from the gross amount of the dividends paid to a non-U.S. holder.
Non-U.S. holders should consult their tax advisors regarding their entitlement
to benefits under a relevant income tax treaty.

                                       60
<PAGE>   63

     Dividends that are effectively connected with a non-U.S. holder's conduct
of a trade or business in the United States or, if an income tax treaty applies,
attributable to a permanent establishment in the United States, are generally
taxed on a net income basis at the regular graduated rates and in the manner
applicable to U.S. persons. In that case, we will not have to withhold U.S.
federal withholding tax if the non-U.S. holder complies with applicable
certification and disclosure requirements, which generally requires the non-U.S.
holder to provide a U.S. taxpayer identification number. In addition, a "branch
profits tax" may be imposed at a 30% rate, or a lower rate under an applicable
income tax treaty, on dividends received by a foreign corporation that are
effectively connected with the conduct of a trade or business in the United
States.

     Dividends paid prior to 2001 to an address in a foreign country are
presumed, absent actual knowledge to the contrary, to be paid to a resident of
such country for purposes of the withholding discussed above and for purposes of
determining the applicability of a tax treaty rate. For dividends paid after
December 31, 2000, a non-U.S. holder who claims the benefit of an applicable
income tax treaty rate generally will be required to satisfy applicable
certification and other requirements. However,

     - in the case of common stock held by a foreign partnership, the
       certification requirement will generally be applied to the partners of
       the partnership and the partnership will be required to provide certain
       information, including a U.S. taxpayer identification number;

     - in the case of common stock held by a foreign trust, the certification
       requirement will be applied to the trust or the beneficial owners of the
       trust depending on whether the trust is a "foreign complex trust,"
       "foreign simple trust" or "foreign grantor trust" as defined in the U.S.
       Treasury regulations;

     - in the case of common stock hold by a foreign estate, the certification
       requirement will be applied to the estate; and

     - look-through rules will apply for tiered partnerships, foreign simple
       trusts and foreign grantor trusts.

     A non-U.S. holder that is a foreign trust is urged to consult its own tax
advisor regarding its status under these U.S. Treasury regulations and the
certification requirement applicable to it.

     A non-U.S. holder that is eligible for a reduced rate of U.S. federal
withholding tax under an income tax treaty may obtain a refund or credit of any
excess amounts withheld by filing an appropriate claim for a refund with the
U.S. Internal Revenue Service.

     The U.S. Treasury regulations generally effective for payments made after
December 31, 2000 also provide special rules for dividend payments made to
foreign intermediaries, U.S. or foreign wholly owned entities that are
disregarded for U.S. federal income tax purposes and entities that are treated
as fiscally transparent in the United States, the applicable income tax treaty
jurisdiction, or both. In addition, recently enacted legislation, effective
August 5, 1997, denies income tax treaty benefits to foreigners receiving income
derived through a partnership, or otherwise fiscally transparent entity, in
certain circumstances. Prospective investors should consult with their own tax
advisers concerning the effect, if any, of these new Treasury regulations and
this recent legislation on an investment in our common stock.

GAIN ON DISPOSITION OF COMMON STOCK

     A non-U.S. holder generally will not be taxed on gain recognized on a
disposition of our common stock unless:

     - the gain is effectively connected with the non-U.S. holder's conduct of a
       trade or business in the United States or, alternatively, if an income
       tax treaty applies, is attributable to a permanent establishment
       maintained by the non-U.S. holder in the United States; in these cases,
       the gain will be taxed on a net income basis at the regular graduated
       rates and in the manner applicable to U.S. persons (unless an applicable
       treaty provides otherwise) and, if the non-U.S. holder is a foreign
       corporation, the "branch profits tax" described above may also apply to
       its "effectively connected earnings and profits," within the meaning of
       the Internal Revenue Code for the taxable year, as adjusted for specific
       items, unless it qualifies for a lower rate under an applicable tax
       treaty;

                                       61
<PAGE>   64

     - the non-U.S. holder is an individual who holds our common stock as a
       capital asset, is present in the United States for at least 183 days in
       the taxable year of the disposition and meets other requirements, then
       such individual generally will be subject to a flat 30% tax on the gain
       derived from a sale, which may be offset by United States capital losses,
       notwithstanding the fact that such individual is not considered a
       resident alien of the U.S. Thus, individual non-U.S. holders who have
       spent (or expect to spend) more than a de minimis period of time in the
       United States in the taxable year in which they contemplate a sale of
       common stock are urged to consult their tax advisers prior to the sale
       concerning the U.S. tax consequences of such sale;

     - the non-U.S. holder is subject to tax under the provisions of the U.S.
       tax law applicable to certain United States expatriates; or

     - we are or have been a "U.S. real property holding corporation" for U.S.
       federal income tax purposes at any time during the shorter of the
       five-year period ending on the date of disposition or the period that the
       non-U.S. holder held our common stock.

     Generally, a corporation is a "U.S. real property holding corporation" if
the fair market value of its "U.S. real property interests" equals or exceeds
50% of the sum of the fair market value of its worldwide real property interests
plus its other assets used or held for use in a trade or business. The tax
relating to stock in a U.S. real property holding corporation generally will not
apply to a non-U.S. holder whose holdings, direct and indirect, at all times
during the applicable period, constituted 5% or less of our common stock,
provided that our common stock was regularly traded on an established securities
market. We believe that we are not currently, and we do not anticipate becoming
in the future, a U.S. real property holding corporation for U.S. federal income
tax purposes. If we were, or were to become, a U.S. real property holding
corporation, we believe that our common stock would be treated as "regularly
traded."

FEDERAL ESTATE TAX

     Common stock owned or treated as owned by an individual who is a non-U.S.
holder at the time of death will be included in the individual's gross estate
for U.S. federal estate tax purposes, unless an applicable estate tax or other
treaty provides otherwise and, therefore, may be subject to U.S. federal estate
tax.

INFORMATION REPORTING AND BACKUP WITHHOLDING TAX

     We must report annually to the U.S. Internal Revenue Service and to each
non-U.S. holder the amount of dividends paid to that holder and the tax withheld
from those dividends. Copies of the information returns reporting those
dividends and withholding may also be made available to the tax authorities in
the country in which the non-U.S. holder is a resident under the provisions of
an applicable income tax treaty or agreement.

     Under some circumstances, U.S. Treasury regulations require additional
information reporting and backup withholding at a rate of 31% on some payments
on common stock. Under currently applicable law, non-U.S. holders generally will
be exempt from these additional information reporting requirements and from
backup withholding on dividends paid prior to 2001 if we either were required to
withhold a U.S. federal withholding tax from those dividends or we paid those
dividends to an address outside the United States. Backup withholding and
information reporting generally will apply to dividends paid to addresses inside
the United States on shares of our common stock to beneficial owners that are
not "exempt recipients" and that fail to provide identifying information in the
manner required. After 2000, the gross amount of dividends paid to a non-U.S.
holder that fails to certify its non-U.S. holder status in accordance with
applicable U.S. Treasury regulations generally will be reduced by backup
withholding at a rate of 31% regardless of whether an address is inside or
outside the United States.

     The payment of the proceeds of the disposition of common stock by a
non-U.S. holder to or through the U.S. office of a broker or a non-U.S. office
of a U.S. broker generally will be reported to the U.S. Internal Revenue Service
and reduced by backup withholding at a rate of 31% unless the non-U.S. holder
either certifies its status as a non-U.S. holder under penalties of perjury or
otherwise establishes an exemption and the broker has no actual knowledge to the
contrary. The payment of the proceeds of the disposition of common

                                       62
<PAGE>   65

stock by a non-U.S. holder to or through a non-U.S. office of a non-U.S. broker
will not be reduced by backup withholding or reported to the U.S. Internal
Revenue Service unless the non-U.S. broker is a "U.S. related person." In
general, the payment of proceeds from the disposition of common stock by or
through a non-U.S. office of a broker that is a U.S. person or a "U.S. related
person" will be reported to the U.S. Internal Revenue Service and, after 2000,
may in limited circumstances be reduced by backup withholding at a rate of 31%,
unless the broker receives a statement from the non-U.S. holder, signed under
penalty of perjury, certifying its non-U.S. status or the broker has documentary
evidence in its files that the holder is a non-U.S. holder and the broker has no
actual knowledge to the contrary. For this purpose, a "U.S. related person" is:

     - a "controlled foreign corporation" for U.S. federal income tax purposes;

     - a foreign person 50% or more of whose gross income from all sources for
       the three-year period ending with the close of its taxable year preceding
       the payment, or for such part of the period that the broker has been in
       existence, is derived from activities that are effectively connected with
       the conduct of a U.S. trade or business; or

     - effective after 2000, a foreign partnership if, at any time during the
       taxable year, (A) at least 50% of the capital or profits interest in the
       partnership is owned by U.S. persons, or (B) the partnership is engaged
       in a U.S. trade or business.

     Non-U.S. holders should consult their own tax advisors regarding the
application of the information reporting and backup withholding rules to them,
including changes to these rules that will become effective after 2000. Any
amounts withheld under the backup withholding rules from a payment to a non-U.S.
holder will be refunded, or credited against the holder's U.S. federal income
tax liability, if any, provided that the required information is furnished to
the U.S. Internal Revenue Service.

                                       63
<PAGE>   66

                                  UNDERWRITERS

     Under the terms and subject to the conditions contained in an underwriting
agreement dated the date of this prospectus, the underwriters named below, for
whom Morgan Stanley & Co. Incorporated, Chase Securities Inc., and FleetBoston
Robertson Stephens Inc. are acting as representatives, have severally agreed to
purchase, and we have agreed to sell to them, severally, the number of shares
indicated below:

<TABLE>
<CAPTION>
                                                              NUMBER OF
                                                               SHARES
                                                              ---------
<S>                                                           <C>
Morgan Stanley & Co. Incorporated...........................  2,825,000
Chase Securities Inc........................................  1,412,500
FleetBoston Robertson Stephens Inc..........................  1,412,500
CIBC World Markets Corp. ...................................     75,000
Dain Rauscher Wessels.......................................     75,000
Ferris, Baker Watts, Incorporated...........................     75,000
First Union Securities, Inc. ...............................     75,000
Guzman & Company............................................     75,000
Edward D. Jones & Co., L.P..................................     75,000
Nutmeg Securities, Ltd. ....................................     75,000
Tucker Anthony Incorporated.................................     75,000
                                                              ---------
          Total.............................................  6,250,000
                                                              =========
</TABLE>

     The underwriters are offering the shares of common stock subject to their
acceptance of the shares from us and subject to prior sale. The underwriting
agreement provides that the obligations of the several underwriters to pay for
and accept delivery of the shares of common stock offered by this prospectus are
subject to the approval of certain legal matters by their counsel and to certain
other conditions. The underwriters are obligated to take and pay for all of the
shares of common stock offered by this prospectus if any such shares are taken.
However, the underwriters are not required to take or pay for the shares covered
by the underwriters over-allotment option described below.

     Morgan Stanley Dean Witter Online, Inc., an affiliate of Morgan Stanley &
Co. Incorporated, may act as a selected dealer in connection with the offering
to facilitate Internet distribution.

     The underwriters initially propose to offer part of the shares of common
stock directly to the public at the public offering price listed on the cover
page of this prospectus and part to certain dealers at a price that represents a
concession not in excess of $0.68 a share under the public offering price. Any
underwriter may allow, and such dealers may reallow, a concession not in excess
of $0.00 a share to other underwriters or to certain dealers. After the initial
offering of the shares of common stock, the offering price and other selling
terms may from time to time be varied by the representatives.

     We have granted to the underwriters an option, exercisable for 30 days from
the date of this prospectus, to purchase up to an aggregate of 937,500
additional shares of common stock at the public offering price listed on the
cover page of this prospectus, less underwriting discounts and commissions. The
underwriters may exercise this option solely for the purpose of covering
overallotments, if any, made in connection with the offering of the shares of
common stock offered by this prospectus. To the extent the option is exercised,
each underwriter will become obligated, subject to certain conditions, to
purchase about the same percentage of the additional shares of common stock as
the number listed next to the underwriter's name in the preceding table bears to
the total number of shares of common stock listed next to the names of all
underwriters in the preceding table. If the underwriters' option is exercised in
full, the total price to the public would be $107,812,500, the total
underwriters' discounts and commissions would be $7,546,875 and total proceeds
to us would be $100,265,625.

     The underwriters have informed us that they do not intend sales to
discretionary accounts to exceed five percent of the total number of shares of
common stock offered by them.

     Our common stock has been approved for quotation on the Nasdaq National
Market under the symbol "ASCX."

                                       64
<PAGE>   67

     We, our directors, executive officers and certain other stockholders have
agreed that, without the prior written consent of Morgan Stanley & Co.
Incorporated on behalf of the underwriters, each of us will not, during the
period ending 180 days after the date of this prospectus:

     - offer, pledge, sell, contract to sell, sell any option or contract to
       purchase, purchase any option or contract to sell, grant any option,
       right or warrant to purchase, lend or otherwise transfer or dispose of
       directly or indirectly, any shares of common stock or any securities
       convertible into or exercisable or exchangeable for common stock; or

     - enter into any swap or other arrangement that transfers to another, in
       whole or in part, any of the economic consequences of ownership of the
       common stock

whether any transaction described above is to be settled by delivery of common
stock or such other securities, in cash or otherwise. This lock-up restriction
is subject, in certain circumstances for shares held by stockholders other than
executive officers of ASC, to earlier release. See "Shares Eligible for Future
Sale -- Lock-up Agreements."

     The restrictions described in the preceding paragraph do not apply to:

     - the sale of any shares to the underwriters;

     - the issuance of shares of common stock by us upon the exercise of an
       option or a warrant or the conversion of a security outstanding on the
       date of this prospectus of which the underwriters have been advised in
       writing;

     - the sale of shares of common stock or the grant of an option to purchase
       common stock under our stock plans described in this prospectus;

     - the issuance by us to our customers or potential customers of warrants to
       purchase common stock existing on the date of the underwriting agreement;

     - the issuance by us of shares of common stock (or options, warrants or
       rights to purchase shares of common stock) in connection with our
       acquisition of other businesses, products or technologies, provided that
       the aggregate number of shares issued (or issuable upon exercise of
       options, warrants or rights issued) does not exceed 6,000,000 shares; or

     - transactions by any person other than us relating to shares of common
       stock or other securities acquired in open market transactions after the
       completion of the offering of the shares.

     In order to facilitate the offering of the common stock, the underwriters
may engage in transactions that stabilize, maintain or otherwise affect the
price of the common stock. Specifically, the underwriters may over-allot in
connection with the offering, creating a short position in the common stock for
their own account. In addition, to cover over-allotments or to stabilize the
price of the common stock, the underwriters may bid for, and purchase, shares of
common stock in the open market. Finally, the underwriting syndicate may reclaim
selling concessions allowed to an underwriter or a dealer for distributing the
common stock in the offering, if the syndicate repurchases previously
distributed common stock in transactions to cover syndicate short positions, in
stabilization transactions or otherwise. Any of these activities may stabilize
or maintain the market price of the common stock above independent market
levels. The underwriters are not required to engage in these activities, and may
end any of these activities at any time.

     From time to time, Morgan Stanley & Co. Incorporated has provided
investment banking services to us. In September 1999, Morgan Stanley Venture
Partners III, L.P., Morgan Stanley Venture Investors, III, L.P. and The Morgan
Stanley Venture Partners Entrepreneur Fund, L.P., affiliates of Morgan Stanley &
Co. Incorporated, purchased 12.5% of our Class D preferred stock.

     We and the underwriters have agreed to indemnify each other against certain
liabilities, including liabilities under the Securities Act.

     At our request, the underwriters have reserved for sale, at the initial
offering price, up to 312,500 shares offered hereby for our directors, officers,
employees, business associates, and related persons. The number of

                                       65
<PAGE>   68

shares of common stock available for sale to the general public will be reduced
to the extent such persons purchase such reserved shares. Any reserved shares
which are not so purchased will be offered by the underwriters to the general
public on the same basis as the other shares offered hereby.

PRICING OF THE OFFERING

     Prior to this offering, there has been no public market for the common
stock. The initial public offering price was determined by negotiations between
us and the representatives. Among the factors considered in determining the
initial public offering price were our future prospects and our industry in
general, sales, earnings and our other financial operating information in recent
periods, and the price-earnings ratios, price-sales ratios, market prices of
securities and certain financial and operating information of companies engaged
in activities similar to ours.

                                 LEGAL MATTERS

     Fried, Frank, Harris, Shriver & Jacobson, a partnership including
professional corporations, in Washington, D.C., will pass upon the validity of
the shares of common stock offered by this prospectus. Davis Polk & Wardwell, in
New York, New York, will pass upon certain legal matters relating to the
offering for the underwriters.

                                    EXPERTS

     The financial statements as of December 31, 1998 and 1999, and for the
period from September 10, 1997 (inception) through December 31, 1997 and for
each of the two years in the period ended December 31, 1999, included in this
prospectus have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their report appearing in this prospectus, and have been so included
in reliance upon the report of such firm given upon their authority as experts
in accounting and auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

     We filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act of 1933 with respect to the
shares of common stock offered by this prospectus. This prospectus does not
contain all of the information set forth in the registration statement and its
exhibits and schedules. Particular items are omitted in accordance with the
rules and regulations of the Securities and Exchange Commission. For further
information about our company and the common stock offered by this prospectus,
we refer you to the registration statement, including its exhibits and
schedules. You may read and copy the registration statement at the Securities
and Exchange Commission's following locations:

<TABLE>
<S>                    <C>                       <C>
Public Reference Room  New York Regional Office  Chicago Regional Office
Room 1024              Seven World Trade Center  Citicorp Center
450 Fifth Street,      Suite 1300                500 West Madison Street
N.W.                   New York, NY 10048        Suite 1400
Washington, DC 20549                             Chicago, IL 60661-2511
</TABLE>

     You may also obtain copies of the registration statement by mail from the
Public Reference Section of the Securities and Exchange Commission at 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549 or by telephone at
1-800-SEC-0330. The registration statement is also available to the public from
commercial document retrieval services and at the Securities and Exchange
Commission's World Wide Web site located at http://www.sec.gov.

     We intend to furnish our stockholders with annual reports containing
financial statements audited by an independent public accounting firm and make
available to our stockholders quarterly reports for the first three quarters of
each fiscal year containing interim unaudited financial information.

                                       66
<PAGE>   69

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Independent Auditors' Report................................  F-2
Balance Sheets..............................................  F-3
Statements of Operations....................................  F-4
Statements of Stockholders' Equity (Deficit)................  F-5
Statements of Cash Flows....................................  F-6
Statements of Comprehensive Loss............................  F-7
Notes to Financial Statements...............................  F-8
</TABLE>

                                       F-1
<PAGE>   70

                          INDEPENDENT AUDITORS' REPORT

To the Board of Directors and Stockholders of
Advanced Switching Communications, Inc.
McLean, Virginia

     We have audited the accompanying balance sheets of Advanced Switching
Communications, Inc. (the "Company") as of December 31, 1998 and 1999, and the
related statements of operations, comprehensive loss, stockholders' equity
(deficit), and cash flows for the period from September 10, 1997 (inception) to
December 31, 1997, and the years ended December 31, 1998 and 1999. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion of these financial statements based on
our audits.

     We conducted our audits in accordance with auditing standards generally
accepted in the United States of America. Those standards require that we plan
and perform the audits to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

     In our opinion, such financial statements present fairly, in all material
respects, the financial position of Advanced Switching Communications, Inc. as
of December 31, 1998 and 1999, and the results of its operations and its cash
flows for the period from September 10, 1997 (inception) to December 31, 1997,
and the years ended December 31, 1998 and 1999, in conformity with accounting
principles generally accepted in the United States of America.

/s/ DELOITTE & TOUCHE LLP
--------------------------------------

McLean, VA
June 9, 2000

                                       F-2
<PAGE>   71

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                                 BALANCE SHEETS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,                     PRO FORMA
                                                              ------------------    JUNE 30,      JUNE 30,
                                                               1998       1999        2000          2000
                                                              -------   --------   -----------   -----------
                                                                                                 (UNAUDITED)
                                                                                   (UNAUDITED)    (NOTE 1)
<S>                                                           <C>       <C>        <C>           <C>
Current assets:
  Cash and cash equivalents.................................  $ 1,449   $ 33,012    $  5,464
  Marketable securities.....................................    3,481         --      11,212
  Accounts receivable.......................................       --      2,116       8,848
  Inventories...............................................        7      2,088       4,964
  Other current assets......................................       29      1,368         432
                                                              -------   --------    --------
        Total current assets................................    4,966     38,584      30,920
                                                              -------   --------    --------
Property and equipment, net.................................    1,484      2,092       3,139
Marketable securities.......................................       --         --       8,872
Other assets................................................        1      1,019       1,021
                                                              -------   --------    --------
                                                                6,451     41,695      43,952
                                                              =======   ========    ========
LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND
  STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable..........................................      548      2,183       8,703
  Accrued compensation and related benefits.................      276        833         599
  Accrued warranty costs....................................       --        143         623
  Other accrued liabilities.................................       27        160         749
  Current portion of long-term debt.........................      199        196         164
                                                              -------   --------    --------
        Total current liabilities...........................    1,050      3,515      10,838
Long-term debt, less current portion........................      286         98          37
Deferred rent...............................................       --         40          65
                                                              -------   --------    --------
                                                                1,336      3,653      10,940
Commitments and contingencies
Class A redeemable convertible preferred stock $1.00 par
  value; 10 authorized; 10 issued and outstanding,
  liquidation value of $2,382 at December 31, 1999 and June
  30, 2000 (unaudited)......................................    2,462      2,617       2,694      $     --
Class B redeemable convertible preferred stock $1.00 par
  value; 14 authorized; 11 issued and outstanding,
  liquidation value of $2,740 at December 31, 1999 and June
  30, 2000 (unaudited)......................................    2,832      3,010       3,099            --
Class C redeemable convertible preferred stock $0.01 par
  value; 4,154 authorized; 2,173, 3,989 and 3,989 issued and
  outstanding at December 31, 1998, 1999 and June 30, 2000
  (unaudited), respectively, liquidation value of $11,639 at
  December 31, 1999 and $12,063 at June 30, 2000
  (unaudited)...............................................    5,299     10,989      11,478            --
Class D redeemable convertible preferred stock $0.01 par
  value; 4,700 authorized; 0, 4,679 and 4,679 issued and
  outstanding at December 31, 1998, 1999 and June 30, 2000
  (unaudited), respectively, liquidation value of $40,954 at
  December 31, 1999 and $42,550 at June 30, 2000
  (unaudited)...............................................       --     38,901      40,612            --
Class E redeemable convertible preferred stock $0.01 par
  value; 100 authorized; 0, 0 and 68 issued and outstanding
  at December 31, 1998, 1999 and June 30, 2000 (unaudited),
  respectively, liquidation value of $500 at June 30, 2000
  (unaudited)...............................................       --         --         500            --
Stockholders' equity (deficit):
    Common stock $0.0025 par value; 37,908 authorized;
      11,960, 11,530 and 11,689 issued and outstanding at
      December 31, 1998, 1999 and June 30, 2000 (unaudited),
      respectively..........................................       30         30          30            86
    Additional paid-in-capital..............................       --         --       7,682        66,009
    Accumulated deficit.....................................   (5,542)   (16,544)    (25,634)      (25,634)
    Treasury stock, 490 shares..............................       --       (200)       (200)         (200)
    Deferred stock compensation.............................       --       (761)     (7,212)       (7,212)
    Accumulated comprehensive loss..........................       34         --         (37)          (37)
                                                              -------   --------    --------      --------
        Total stockholders' equity (deficit)................   (5,478)   (17,475)    (25,371)     $ 33,012
                                                              -------   --------    --------      --------
                                                              $ 6,451   $ 41,695    $ 43,952
                                                              =======   ========    ========
</TABLE>

    The accompanying notes are an integral part of the financial statements.
                                       F-3
<PAGE>   72

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                            STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                     PERIOD FROM
                                      INCEPTION
                                    (SEPTEMBER 10,                                     SIX MONTHS ENDED
                                    1997) THROUGH       YEAR ENDED DECEMBER 31,            JUNE 30,
                                     DECEMBER 31,       -----------------------      ---------------------
                                         1997             1998          1999          1999          2000
                                    --------------      --------      ---------      -------      --------
                                                                                          (UNAUDITED)
<S>                                 <C>                 <C>           <C>            <C>          <C>
Revenue...........................      $   --          $    --       $  4,278       $   402      $ 12,933
Cost of revenue...................          --               --          2,839           337         9,556
                                        ------          -------       --------       -------      --------
Gross profit......................          --               --          1,439            65         3,377
Operating expenses:
  Research and development,
     excluding stock compensation
     amortization amounts(1)......         111            3,717          6,718         3,021         5,528
  Sales and marketing, excluding
     stock compensation
     amortization amounts(1)......          73              799          3,209         1,292         6,543
  General and administrative,
     excluding stock compensation
     amortization amounts(1)......         125              611          1,251           484           961
  Amortization of stock
     compensation(1)..............          --               --             42            --           491
                                        ------          -------       --------       -------      --------
       Total operating expenses...         309            5,127         11,220         4,797        13,523
                                        ------          -------       --------       -------      --------
Loss from operations..............        (309)          (5,127)        (9,781)       (4,732)      (10,146)
Other income (expenses):
  Interest income.................          18               87            539           112         1,068
  Interest expense................          (2)             (71)           (87)          (20)          (12)
                                        ------          -------       --------       -------      --------
       Total other income
          (expense)...............          16               16            452            92         1,056
                                        ------          -------       --------       -------      --------
Net loss..........................        (293)          (5,111)        (9,329)       (4,640)       (9,090)
Accretion of transaction costs and
  accrued dividends on redeemable
  convertible preferred stock.....          --             (367)        (2,589)         (482)       (2,815)
                                        ------          -------       --------       -------      --------
Net loss applicable to common
  shareholders....................      $ (293)         $(5,478)      $(11,918)      $(5,122)     $(11,905)
                                        ======          =======       ========       =======      ========
Basic and diluted loss per
  share...........................      $(0.05)         $ (0.48)      $  (1.01)      $ (0.43)     $  (1.03)
                                        ======          =======       ========       =======      ========
Weighted average shares used in
  net loss per share
  calculations....................       5,742           11,389         11,789        11,958        11,601
                                        ======          =======       ========       =======      ========
Pro forma net loss per share,
  basic and diluted (unaudited)
  (Note 1)........................                                    $  (0.38)                   $  (0.28)
                                                                      ========                    ========
Shares used in computing pro forma
  basic and diluted net loss per
  share (unaudited) (Note 1)......                                      24,251                      32,462
                                                                      ========                    ========
</TABLE>

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

<TABLE>
<S>                                     <C>             <C>          <C>           <C>          <C>
(1) AMORTIZATION OF STOCK COMPENSATION:
     Research and development.....      $   --          $    --      $      5      $    --      $    207
     Sales and marketing..........          --               --            35           --           233
     General and administrative...          --               --             2           --            51
                                        ------          -------      --------      -------      --------
                                        $   --          $    --      $     42      $    --      $    491
                                        ======          =======      ========      =======      ========
</TABLE>

    The accompanying notes are an integral part of the financial statements.
                                       F-4
<PAGE>   73

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                              COMMON STOCK     ADDITIONAL                                            ACCUMULATED    STOCKHOLDER'S
                             ---------------    PAID-IN     TREASURY   ACCUMULATED     DEFERRED     COMPREHENSIVE      EQUITY
                             SHARES   AMOUNT    CAPITAL      STOCK       DEFICIT     COMPENSATION       LOSS          (DEFICIT)
                             ------   ------   ----------   --------   -----------   ------------   -------------   -------------
<S>                          <C>      <C>      <C>          <C>        <C>           <C>            <C>             <C>
Shares issued..............   9,580    $24      $   147      $  --      $     --       $    --          $ --          $    171
Net loss...................      --     --           --         --          (293)           --            --              (293)
                             ------    ---      -------      -----      --------       -------          ----          --------
Balance, December 31,
  1997.....................   9,580     24          147                     (293)           --            --              (122)
Shares issued..............   2,380      6           36         --            --            --            --                42
Options granted for
  consulting services......      --     --           46         --            --            --            --                46
Dividends accrued on
  redeemable, convertible
  preferred stock..........      --     --         (229)        --          (100)           --            --              (329)
Accretion of transaction
  costs on redeemable,
  convertible preferred
  stock....................      --     --           --         --           (38)           --            --               (38)
Unrealized gain on
  securities...............      --     --           --         --            --            --            34                34
Net loss...................      --     --           --         --        (5,111)           --            --            (5,111)
                             ------    ---      -------      -----      --------       -------          ----          --------
Balance, December 31,
  1998.....................  11,960     30           --                   (5,542)           --            34            (5,478)
Shares repurchased.........      --     --           --       (200)           --            --            --              (200)
Options granted for
  consulting services......      --     --           47         --            --            --            --                47
Gain on sale of
  securities...............      --     --           --         --            --            --           (34)              (34)
Options exercised..........      59     --           66         --            --            --            --                66
Deferred compensation
  expense associated with
  equity awards............      --     --          803         --            --          (803)           --                --
Amortization of deferred
  compensation.............      --     --           --         --            --            42            --                42
Dividends accrued on
  redeemable, convertible
  preferred stock..........             --         (916)                  (1,035)           --                          (1,951)
Preferred stock dividend...      --     --           --         --          (418)           --            --              (418)
Accretion of transaction
  costs on redeemable,
  convertible preferred
  stock....................      --     --           --         --          (220)           --            --              (220)
Net loss...................      --     --           --         --        (9,329)           --            --            (9,329)
                             ------    ---      -------      -----      --------       -------          ----          --------
Balance, December 31,
  1999.....................  12,019     30           --       (200)      (16,544)         (761)           --           (17,475)
Options exercised
  (unaudited)..............     159     --          196         --            --            --            --               196
Deferred compensation
  expense associated with
  equity awards
  (unaudited)..............      --     --        6,942         --            --        (6,942)           --                --
Amortization of deferred
  compensation.............      --     --           --         --            --           491            --               491
Issuance of warrants
  (unaudited)..............      --     --        2,981         --            --            --            --             2,981
Beneficial conversion
  feature associated with
  preferred stock issued to
  a related party
  (unaudited)..............      --     --          378         --            --            --            --               378
Dividends accrued on
  redeemable, convertible
  preferred stock
  (unaudited)..............      --     --       (2,193)        --            --            --            --            (2,193)
Accretion of transaction
  costs and beneficial
  conversion feature on
  redeemable, convertible
  preferred stock
  (unaudited)..............      --     --         (622)        --            --            --            --              (622)
Unrealized gain on
  securities (unaudited)...      --     --           --         --            --            --           (37)              (37)
Net loss...................      --     --           --         --        (9,090)           --            --            (9,090)
                             ------    ---      -------      -----      --------       -------          ----          --------
Balance, June 30, 2000
  (unaudited)..............  12,178    $30      $ 7,682      $(200)     $(25,634)      $(7,212)         $(37)         $(25,371)
                             ======    ===      =======      =====      ========       =======          ====          ========
</TABLE>

    The accompanying notes are an integral part of the financial statements.
                                       F-5
<PAGE>   74

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                            STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                              PERIOD FROM
                                               INCEPTION
                                             (SEPTEMBER 10,
                                                 1997)            YEAR ENDED         SIX MONTHS ENDED
                                                THROUGH          DECEMBER 31,            JUNE 30,
                                              DECEMBER 31,    -------------------   -------------------
                                                  1997         1998        1999      1999        2000
                                             --------------   -------    --------   -------    --------
                                                                                        (UNAUDITED)
<S>                                          <C>              <C>        <C>        <C>        <C>
OPERATING ACTIVITIES:
  Net loss.................................      $(293)       $(5,111)   $ (9,329)  $(4,640)   $ (9,090)
  Adjustments to reconcile net loss to net
     cash used in operating activities:
     Loss on disposal of equipment.........         --             --          --        --          13
     Realized gain on marketable
       securities..........................         --            (45)        (34)      (34)       (105)
     Depreciation and amortization.........          5            216         657       293         593
     Amortization of stock compensation....         --             --          42        --         491
     Warrant issuance costs................         --             --          --        --       2,981
     Deferred rent.........................         71             --          40        20          25
     Consulting expense related to stock
       options.............................                        46          47                    --
  Changes in operating assets and
     liabilities:
     Accounts receivable...................         --             --      (2,116)     (316)     (6,732)
     Inventory.............................         --             (7)     (2,081)   (2,012)     (2,876)
     Other current assets..................         (1)           (28)     (1,339)       19         936
     Accounts payable......................         35            513       1,635     1,359       6,520
     Accrued liabilities...................         57            246         833        27         835
     Other assets..........................         --             (1)     (1,018)   (1,010)         (2)
                                                 -----        -------    --------   -------    --------
Net cash used in operating activities......       (126)        (4,171)    (12,663)   (6,294)     (6,411)
                                                 -----        -------    --------   -------    --------
INVESTING ACTIVITIES:
  Purchases of property and equipment......       (122)        (1,583)     (1,266)     (406)     (1,653)
  Proceeds from sales of marketable
     securities............................         --             --       3,481     3,481      14,046
  Purchases of marketable securities.......       (153)        (3,362)         --        --     (34,134)
                                                 -----        -------    --------   -------    --------
     Net cash used in (provided by)
       investing activities................       (275)        (4,945)      2,215     3,075     (21,741)
                                                 -----        -------    --------   -------    --------
FINANCING ACTIVITIES:
  Proceeds from issuance of common stock...        171             40          --        --          --
  Proceeds from issuance of preferred
     stock.................................         --         10,270      42,336     4,507         500
  Proceeds from exercise of stock
     options...............................         --             --          66        --         196
  Proceeds from issuance of notes
     payable...............................        333            408          --     1,000          --
  Principal payments on notes payable......         (5)          (251)       (191)      (98)        (92)
  Repurchase of treasury shares............         --             --        (200)       --          --
                                                 -----        -------    --------   -------    --------
     Net cash provided by (used in)
       financing activities................        499         10,467      42,011    (5,409)        604
                                                 -----        -------    --------   -------    --------
Net increase (decrease) in cash and cash
  equivalents..............................         98          1,351      31,563     2,190     (27,548)
Cash and cash equivalents, beginning of
  period...................................         --             98       1,449     1,449      33,012
                                                 -----        -------    --------   -------    --------
Cash and cash equivalents, end of period...      $  98        $ 1,449    $ 33,012   $ 3,639    $  5,464
                                                 =====        =======    ========   =======    ========
SUPPLEMENTAL SCHEDULE OF CASH FLOW
  INFORMATION:
  Interest paid............................      $   2        $    27    $     86   $    19    $     14
                                                 =====        =======    ========   =======    ========
</TABLE>

    The accompanying notes are an integral part of the financial statements.
                                       F-6
<PAGE>   75

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                        STATEMENTS OF COMPREHENSIVE LOSS
                             (AMOUNTS IN THOUSANDS)

<TABLE>
<CAPTION>
                                             PERIOD FROM
                                              INCEPTION
                                            (SEPTEMBER 10,
                                                1997)           YEAR ENDED       SIX MONTHS ENDED
                                               THROUGH         DECEMBER 31,          JUNE 30,
                                             DECEMBER 31,    -----------------   -----------------
                                                 1997         1998      1999      1999      2000
                                            --------------   -------   -------   -------   -------
                                                                                    (UNAUDITED)
<S>                                         <C>              <C>       <C>       <C>       <C>
Net loss..................................      $(293)       $(5,111)  $(9,329)  $(4,640)  $(9,090)
Unrealized gain (loss) on marketable
  securities..............................         --             34       (34)       --       (37)
                                                -----        -------   -------   -------   -------
Comprehensive loss........................      $(293)       $(5,077)  $(9,363)  $(4,640)  $(9,127)
                                                =====        =======   =======   =======   =======
</TABLE>

    The accompanying notes are an integral part of the financial statements.
                                       F-7
<PAGE>   76

                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                         NOTES TO FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

  Nature of Operations

     Advanced Switching Communications, Inc. ("ASC" or the "Company") was
incorporated in the state of Delaware in September 1997. The Company provides
next-generation broadband access platforms to telecommunications service
providers. ASC's products enable its customers to transmit voice, data and
multimedia traffic more rapidly and cost-effectively while preserving their
investments in existing communications systems. Through December 31, 1999, the
Company principally marketed its products in the United States. Through December
31, 1998, the Company was considered to be in the development stage and was
principally engaged in research and development, raising capital and building
its management team. The Company shipped its first product in March 1999.

  Revenue Recognition

     The Company recognizes revenue from product sales upon shipment. When the
arrangement with the customer includes obtaining customer acceptance, revenue is
recognized when customer acceptance has been received. Revenue is recognized in
amounts expected to be realized upon final settlement.

     ASC provides post-contract support under a warranty agreement for its
products. Upon shipment to its customers, ASC provides for the estimated cost to
repair or replace products to be returned under warranty. ASC's warranty period
is typically 12 months from the date of shipment to the end-user. This support
is considered insignificant to the sale of the products and therefore the
Company recognizes any revenue associated with post-contract support in
conjunction with the sale of the product.

  Research and Development

     Research and development costs are charged to operations as incurred.

  Cash and Cash Equivalents and Marketable Securities

     The Company considers all highly-liquid investments purchased with an
original maturity of three months or less to be cash equivalents, and
investments with original maturity dates greater than three months but less than
12 months to be short-term investments. To date, all marketable securities have
been classified as available-for-sale and have been carried at fair value, with
unrealized gains and losses, reported as a separate component of comprehensive
income. The fair value of marketable securities was determined based on quoted
market prices at the reporting date for those instruments. The cost of
securities sold is based on specific identification. Premiums and discounts are
amortized over the period from acquisition to maturity and are included in
investment income, along with interest and dividends.

     At December 31, 1998, the Company held U.S. mortgage-backed and corporate
debt securities with an amortized cost of $3,447,000 and a fair value of
$3,481,000, resulting in an unrealized holding gain of $34,000. At June 30,
2000, the Company held U.S. mortgage-backed and corporate debt securities,
commercial paper and taxable auction securities. The amortized cost of such
securities at June 30, 2000 was $24,807,000 (unaudited) resulting in an
unrealized holding loss of $37,000 (unaudited).

  Inventories

     Inventories are stated at the lower of cost (average cost basis) or market
(net realizable value).

                                       F-8
<PAGE>   77
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

  Other Assets

     Other assets include prepaid manufacturing costs to the contract
manufacturers of $1,314,000 at December 31, 1999. These prepaid costs were being
reduced as completed products were received by the Company. There were no such
prepaid costs at June 30, 2000 (unaudited).

  Property and Equipment

     Property and equipment is stated at cost and depreciated over the estimated
useful lives of the assets using the straight-line method, based upon the
following asset lives:

<TABLE>
<S>                                        <C>
Computer and telecommunications equipment  3 years
Computer software                          3 years
Furniture and office equipment             5 years
Leasehold improvements                     Shorter of lease term or useful life of asset
</TABLE>

  Income Taxes

     Income taxes are accounted for using the liability method. Under this
method, deferred tax assets and liabilities are recorded based on temporary
differences between the financial statement amounts and the tax bases of assets
and liabilities measured using enacted tax rates in effect for the year in which
the differences are expected to reverse. The Company periodically evaluates the
realizability of its net deferred tax assets and records a valuation allowance
if, based on the weight of available evidence, it is more likely than not that
some or all of the deferred tax assets will not be realized.

  Use of Estimates

     The preparation of financial statements in conformity with accounting
principles generally accepted in the United States requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities at the dates of the financial statements and the reported amounts of
revenue and expenses during the reporting period. Actual results could differ
from these estimates.

  Accounting for Stock-Based Compensation

     As permitted under Statement of Financial Accounting Standards (SFAS) No.
123, "Accounting for Stock-Based Compensation", ("SFAS 123"), the Company
accounts for stock option grants to employees and directors in accordance with
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees". Accordingly, ASC recognizes no compensation expense for stock option
grants with an exercise price equal to or greater than the fair value of the
shares at the date of grant. Stock options issued to consultants of the Company
are accounted for under SFAS 123, which requires an expense to be recognized
using an option-pricing model. The expense recorded in connection with the stock
option grants to consultants was $46,000 and $47,000 for the years ended
December 31, 1998 and 1999, respectively.

  Fair Value of Financial Instruments

     The carrying value of the Company's cash and cash equivalents, marketable
securities, accounts receivable, accounts payable and accrued liabilities
approximate their fair values due to their relatively short maturities. The fair
value of long-term marketable securities is estimated based on current interest
rates, degrees of risk and remaining maturities.

     The fair value of short and long-term debt is estimated based on current
interest rates available to the Company for debt instruments with similar terms,
degrees of risk and remaining maturities. The carrying amounts of these
obligations approximate their fair values.

                                       F-9
<PAGE>   78
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

  Concentration of Credit Risk, Product and Significant Customers and Supplier
Information

     Financial instruments which potentially subject the Company to
concentrations of credit risk consist principally of cash and cash equivalents,
investments in marketable securities and accounts receivable. The Company places
its temporary cash investments in money market funds and debt instruments with
high credit-quality issuers with no more than 10% of the portfolio due from any
one issuer. The Company's accounts receivable are derived from revenue earned
from customers located in the United States. The Company performs ongoing credit
evaluations of its customers' financial condition and, generally, requires no
collateral from its customers. The Company maintains an allowance for doubtful
accounts receivable based upon the expected collectibility of accounts
receivable.

     During the year ended December 31, 1999, two customers accounted for 22%
and 53% of the Company's revenue and at December 31, 1999, these two customers
accounted for 29% and 49% of total trade accounts receivable. During the six
months ended June 30, 2000, these same two customers accounted for 11% and 10%
of the Company's revenue and at June 30, 2000, these two customers accounted for
9% and 5% of total trade receivables (unaudited). One additional customer
accounted for 53% of the Company's revenue and 62% of total trade receivables at
June 30, 2000 (unaudited).

     The Company is currently dependent on two contract manufacturers and some
of the key components in the Company's product come from single or limited
sources of supply. If the Company is unable to manufacture and ship our products
on a timely basis, this could result in lost or delayed revenue or increased
manufacturing costs.

  Pro Forma Information (unaudited)

     Under the terms of the Company's agreements with the holders of the Class
A, B, C, D and E Redeemable Convertible Preferred Stock ("Convertible Preferred
Stock") (Note 7), all of such preferred stock will be converted automatically
into shares of common stock upon closing of the Company's initial public
offering and, therefore, all such shares have been converted for the pro forma
presentation. The pro forma balance sheet information at June 30, 2000 reflects
the conversion of the Class A, B, C, D and E preferred stock into 22,651,937
shares of common stock as if the conversion occurred on June 30, 2000. The
Common Shares to be issued resulting from an initial public offering and its
related net proceeds are excluded from such pro forma information.

  Net Loss Per Share

     The Company computes net loss per share in accordance with SFAS No. 128,
"Earnings per Share". Under the provisions of SFAS No. 128, basic net loss per
share is computed by dividing the net loss applicable to common shareholders for
the period by the weighted average number of common shares outstanding during
the period. Diluted net loss per share is computed by dividing the net loss for
the period by the weighted average number of common and common equivalent shares
outstanding during the period, if dilutive. Common equivalent shares consist of
incremental common shares issuable upon the exercise of stock options and upon
conversion of Class A, B, C, D and E Convertible Preferred Stock.

     The Company has excluded all potential common shares from the calculation
of diluted loss per common share because all such securities are anti-dilutive
for all periods presented. The total number of potential common shares excluded
from the calculations of diluted net loss per share was zero, 7,870,000,
22,272,000, 14,069,000 (unaudited) and 26,981,000 (unaudited) for the period
ended December 31, 1997, the years ended December 31, 1998 and 1999 and the six
months ended June 30, 1999 and 2000, respectively.

                                      F-10
<PAGE>   79
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

  Pro Forma Net Loss Per Share (Unaudited)

     Pro forma net loss per share for the year ended December 31, 1999 and the
six months ended June 30, 2000 is computed using the weighted average number of
common shares outstanding, including the pro forma effects of the automatic
conversion of the Company's Class A, B, C, D and E Convertible Preferred Stock
into shares of the Company's common stock effective upon the closing of the
Company's initial public offering as if such conversion occurred on January 1,
1999, or at date of original issuance, if later.

     The following table sets forth the pro forma computation of basic and
diluted net loss per share for the periods indicated (in thousands, except per
share amounts):

<TABLE>
<CAPTION>
                                                           YEAR ENDED           SIX MONTHS
                                                          DECEMBER 31,             ENDED
                                                              1999             JUNE 30, 2000
                                                          ------------         -------------
<S>                                                       <C>                  <C>
Numerator:
Net loss applicable to common shareholders..............    $(11,918)            $(11,905)
Accretion of transaction costs and accrued dividends on
  redeemable, convertible preferred stock...............       2,589               (2,815)
                                                            --------             --------
Pro Forma net loss......................................    $ (9,329)            $ (9,090)
                                                            ========             ========
Historical weighted average common shares outstanding...      11,789               11,601
Weighted average number of shares assumed upon
  conversion of redeemable convertible common stock.....      12,462               20,861
                                                            --------             --------
Shares used in computing pro forma basic and diluted net
  loss per share........................................      24,251               32,462
                                                            ========             ========
Pro forma basic and diluted net loss per share..........    $  (0.38)            $  (0.28)
                                                            ========             ========
</TABLE>

  New Accounting Pronouncements

     In June 1998, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards ("SFAS") No. 133, "Accounting for
Derivative Instruments and Hedging Activities." SFAS No. 133 established methods
of accounting for derivative financial instruments and hedging activities
related to those instruments as well as other hedging activities. Because the
Company currently holds no derivative instruments and does not engage in hedging
activities, the Company expects that the adoption of SFAS No. 133 will not have
a material impact on its financial position, results of operations or cash
flows. The Company will be required to implement SFAS No. 133 for the year
ending December 31, 2001.

     In March 2000, the FASB issued Interpretation No. 44, "Accounting for
Certain Transactions Involving Stock Compensation, an Interpretation of APB
Opinion No. 25." With the exception of certain provisions which require earlier
application, this interpretation is effective for all applicable transactions
beginning July 1, 2000. The Company does not expect that the adoption of this
Interpretation will have a material impact on its financial statements.

  Unaudited Interim Results

     The accompanying balance sheet as of June 30, 2000, the statements of
operations, cash flows and comprehensive loss for the six months ended June 30,
1999 and 2000 and the statement of stockholders' equity for the six months ended
June 30, 2000 are unaudited.

     In the opinion of management, these statements have been prepared on the
same basis as the audited financial statements and include all adjustments,
consisting only of normal recurring adjustments, necessary for the fair
statement of the results of these periods. The data disclosed in notes to the
financial statements for

                                      F-11
<PAGE>   80
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

these periods is also unaudited. Results of the six months ended June 30, 2000
are not indicative of results the entire year.

2.  INVENTORIES

     Inventories consisted of the following at December 31, 1998 and 1999 and
June 30, 2000 (in thousands):

<TABLE>
<CAPTION>
                                                                             (UNAUDITED)
                                                             1998    1999       2000
                                                             ----   ------   -----------
<S>                                                          <C>    <C>      <C>
Raw materials..............................................   $7    $1,065     $  373
Work in process............................................   --       798          6
Finished goods.............................................   --       225      4,585
                                                              --    ------     ------
                                                              $7    $2,088     $4,964
                                                              ==    ======     ======
</TABLE>

3.  PROPERTY AND EQUIPMENT

     Property and equipment consisted of the following at December 31, 1998 and
1999 (in thousands):

<TABLE>
<CAPTION>
                                                               1998     1999
                                                              ------   ------
<S>                                                           <C>      <C>
Computer software and equipment.............................  $  808   $1,454
Office equipment............................................     650    1,074
Furniture and fixtures......................................     231      419
Equipment under capital leases..............................      16       23
                                                              ------   ------
                                                               1,705    2,970
Less accumulated depreciation...............................    (221)    (878)
                                                              ------   ------
Property and equipment, net.................................  $1,484   $2,092
                                                              ======   ======
</TABLE>

4.  INCOME TAXES

     No provisions for income taxes have been recorded as the Company has
incurred net losses since inception.

     At December 31, 1998 and 1999, the Company had approximately $5.4 million
and $14.7 million of federal and state net operating loss carryforwards
available to offset future taxable income. The Federal and State net operating
loss carryforwards begin to expire in 2012 and 2004, respectively. Under the Tax
Reform Act of 1986, the amounts of and benefits from net operating loss
carryforwards may be impaired or limited in certain circumstances. Events which
cause limitations in the amount of net operating losses that the Company may
utilize in any one year include, but are not limited to, a cumulative ownership
change of more than 50%, as defined, over a three year period. Such a change may
have occurred as a result of the preferred stock issuances during 1998 and 1999.

     As of December 31, 1998 and 1999, the Company had gross deferred tax assets
of approximately $2.2 million and $5.9 million, respectively, related primarily
to net operating loss carryforwards that are available to reduce future taxable
income through 2019. Management believes that, based on a number of factors, the
available objective evidence creates sufficient uncertainty regarding the
realizability of the deferred tax assets such that a full valuation allowance
has been recorded.

                                      F-12
<PAGE>   81
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

5.  LONG-TERM DEBT

     Amounts borrowed consisted of the following at December 31, 1998 and 1999
(in thousands):

<TABLE>
<CAPTION>
                                                              1998    1999
                                                              -----   -----
<S>                                                           <C>     <C>
Bank note payable, interest at prime plus 2% (10.5% at
  December 31, 1999), due in monthly installments of $5 plus
  interest through November 2000, collateralized by the
  Company's furniture.......................................  $ 110   $  53
Bank note payable, interest at prime plus 0.5% (9.0% at
  December 31, 1999), due in monthly installments of $2 plus
  interest through April 2001, collateralized by
  substantially all of the Company's assets.................     43      26
Bank note payable, interest at prime plus 0.75% (9.25% at
  December 31, 1999), due in monthly installments of $10
  plus interest through June 2001, collateralized by
  substantially all of the Company assets...................    322     204
                                                              -----   -----
                                                                475     283
Amounts under capital lease (Note 6)........................     10      11
Less current portion........................................   (199)   (196)
                                                              -----   -----
Long-term portion...........................................  $ 286   $  98
                                                              =====   =====
</TABLE>

6.  COMMITMENTS

     The Company leases office space and equipment under various noncancelable
operating and capital leases with various expiration dates through 2005. The
terms of the facility leases provide for rental payments on a graduated scale.
The facility leases for the Company's headquarters expire in August 2002 and
November 2005. The Company leases office space for sales personnel in various
cities throughout the U.S. These leases are on a month-to-month arrangement or
are for a period of no longer than 1 year. The Company recognizes rent expense
on a straight-line basis over the lease periods. Rental expense for all
operating leases for the period from September 7, 1997 through December 31, 1997
and the years ended December 31, 1998 and 1999 was $71,000, $355,000 and
$673,000, respectively.

     Future minimum lease payments under noncancelable operating and capital
leases, including operating lease commitments entered into subsequent to
December 31, 1999, are as follows:

<TABLE>
<CAPTION>
                                                              CAPITAL    OPERATING
                                                              LEASES      LEASES
                                                              -------    ---------
<S>                                                           <C>        <C>
2000........................................................    $ 7       $1,097
2001........................................................      2        1,181
2002........................................................      2        1,017
2003........................................................     --          625
2004........................................................     --          639
Thereafter..................................................     --          600
                                                                ---       ------
                                                                 11       $5,159
                                                                ---       ======
Less current portion........................................     (7)
                                                                ---
Long-term portion...........................................    $ 4
                                                                ===
</TABLE>

     In connection with the lease of the Company's headquarters, the Company is
required to maintain $1,000,000 in an escrow account with the bank that has
issued a letter of credit to the landlord. This escrow requirement terminates at
the sooner of the end of the lease term or the time at which ASC has maintained
a

                                      F-13
<PAGE>   82
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

net worth in excess of $5,000,000 for 24 consecutive months. This amount has
been recorded in long-term other assets for the year ended December 31, 1999.

     Subsequent to December 31, 1999, the Company received a letter from Nortel
Networks Corporation alleging that our products infringe one of Nortel's patents
relating to inverse multiplexing over ATM. Management intends to contest this
claim vigorously. Management is of the opinion that any liability or loss
associated with this claim will not have a material adverse effect on the
Company's operations or liquidity.

     The Company is involved in various other claims arising in the normal
course of business. Management is of the opinion that any liability or loss
associated with such matters will not have a material adverse effect on the
Company's operations or liquidity.

7.  REDEEMABLE CONVERTIBLE PREFERRED STOCK

     Issuances of redeemable convertible preferred stock during the years ended
December 31, 1998 and 1999 and the six months ended June 30, 2000 (unaudited)
were as follows (in thousands).

<TABLE>
<CAPTION>
                                     SHARES
                               -------------------                ISSUANCE         DATE
            CLASS              AUTHORIZED   ISSUED    PROCEEDS     COSTS          ISSUED
            -----              ----------   ------    --------    --------    --------------
<S>                            <C>          <C>       <C>         <C>         <C>
A............................        10        10     $ 2,382      $   --     June 1998
B............................        14        11       2,740          --     June 1998
C............................     4,154     2,173       5,893         789     August 1998
                                            1,662       4,506          11     June 1999
                                              154(1)       --(1)       --     September 1999
D............................     4,700     4,094      35,002       1,822     September 1999
                                              585       5,000         338     October 1999
E............................       100        68         500          --     June 2000
                                 ------     -----     -------      ------
                                  8,978     8,757     $56,023      $2,960
                                 ======     =====     =======      ======
</TABLE>

---------------
(1) This tranche of Class C Redeemable Convertible Preferred shares was issued
    in accordance with the anti-dilutive provisions for Class C at the time of
    the sale of Class D Redeemable Convertible Preferred shares. As there were
    no proceeds in connection with the Class C shares, the number of shares
    valued at the liquidation price per share was treated as a dividend in order
    to record the Class C at its liquidation value in the balance sheet.

     The holders of the Redeemable Convertible Preferred Stock have various
rights and preferences as follows:

  Voting

     Each share of Class A, B, C and D has voting rights equal to an equivalent
number of shares of Common Stock into which it is convertible and votes together
as one class with the Common Stock.

  Dividends

     Holders of Class A, B, C and D Redeemable Convertible Preferred Stock are
entitled to receive cumulative dividends at the per annum rate of 6.5%, 6.5%, 8%
and 8% of the original purchase price paid, respectively, whether or not
declared, payable quarterly in arrears, when and if declared by the Board of
Directors. The holders of Class A, B, C and D have rights to receive a pro rata
share of dividends paid to holders of commons stock. No dividends on Convertible
Preferred Stock or Common Stock have been declared from inception through June
30, 2000. All accrued dividends are included in the Convertible Preferred Stock
balances at the respective balance sheet dates.

                                      F-14
<PAGE>   83
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

  Liquidation

     In the event of any involuntary liquidation, dissolution or winding up of
the Company the holders of Class A, B, C and D Convertible Preferred Stock are
entitled to receive an amount of $250, $250, $2.71 and $8.55 per share,
respectively, plus any accrued dividends, whether or not declared, prior to and
in preference to any distribution to the holders of Common Stock.

  Conversion

     Each share of Class A and B Convertible Preferred Stock is convertible, at
the option of the holder, upon the occurrence of a triggering event which is
defined as follows: (1) the closing of a public offering of Common Stock
generating aggregate proceeds of $50,000,000, or (2) the Company enters into a
merger consolidation or other similar combination, or (3) the Company achieves
an annual gross revenue of more than $25,000,000. Each share of Class C and D
Redeemable Convertible Preferred Stock may be converted at any time at the
option of the holder. Each share of Class C and D Redeemable Convertible
Preferred Stock automatically converts upon: (1) the closing of a public
offering of Common Stock generating aggregate proceeds of $50,000,000 or (2) the
Company enters into a merger, consolidation or other similar combination for a
total purchase price of the equity of the Company of at least $250,000,000. Upon
the conversion of Class C shares, Class A and B shares automatically convert
into shares of common stock. Class A, B, C and D preferred shares are
convertible into common shares based on the following calculation: the sum of
the original issuance price per share multiplied by the number of shares
outstanding plus the cumulative accrued dividends, divided by the applicable
conversion ratio. The original issue price per share is $250, $250, $2.7117 and
$8.55 for Classes A, B, C and D, respectively. The conversion ratios are 4.275,
1.00, 1.356 and 4.275 for Classes A, B, C and D, respectively.

     At December 31, 1999, the Company has reserved 612,000, 3,010,000,
8,584,000 and 9,580,000 shares of Common Stock for the conversion of Class A, B,
C and D convertible preferred stock, respectively.

     At June 30, 2000, the Company has reserved 630,000, 3,099,000, 8,902,000,
9,953,000 and 68,000 shares of Common Stock for the conversion of Class A, B, C,
D and E Convertible Preferred Stock, respectively (unaudited).

  Redemption

     The Class A and B shares are redeemable at the option of the holder upon
the same triggering event under which it is convertible, at a cash price equal
to the applicable liquidation preference. Shares of Class C and D are redeemable
at the option of the holder any time on or after August 31, 2005 at a cash price
equal to the applicable liquidation preference.

  Series E Convertible Redeemable Preferred Stock (unaudited)

     On June 30, 2000, the Company issued 67,567 shares of Class E convertible
redeemable preferred stock to a board member for a purchase price of $500,000 or
$7.40 per share. These shares are convertible at any time at the option of the
holder and automatically convert to common stock upon an initial public
offering. The total number of common shares into which they are convertible is
67,567 at the issuance date. At the time of issuance of the Class E shares, the
deemed fair value of the underlying common shares was $13.00 per share.
Therefore, $378,000 was initially allocated to additional paid-in capital as a
presumed beneficial conversion feature. As the Class E shares are convertible at
any time, the entire amount of $378,000 was immediately accreted to the Series E
Convertible Redeemable Preferred Stock on June 30, 2000.

                                      F-15
<PAGE>   84
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

8.  COMMON STOCK

     In February 1998, the Company's Board of Directors approved a 20-for-1
stock split of the issued and outstanding common stock and in July 1998, the
Company's Board of Directors approved a 10-for-1 stock split of the issued and
outstanding common stock. In August 1999, the Company's Board of Directors
approved a 2-for-1 stock split of the issued and outstanding common stock. The
2-for-1 split became effective in November 1999. All share and per share amounts
for common stock have been adjusted accordingly.

     The Company issued 339,000 and 31,000 options to purchase shares of Common
Stock to consultants and other service providers of the Company in 1998 and
1999, respectively. The fair value of the options issued was determined to be
$46,000 and $47,000 in 1998 and 1999, respectively, using the Black-Scholes
option pricing model and has been recognized in general and administrative
expenses. There were no options granted to third parties during the quarters
ended June 30, 1999 and 2000.

  Warrants (unaudited)

     In March 2000, in connection with the signing of a purchase agreement with
a customer, the Company issued to Intermedia Communications, Inc. a warrant to
purchase 125,000 shares of common stock at an exercise price of $15.00 per
share. Under the original warrant agreement, the warrant vested and became
exercisable as product payments were made. In June 2000, the Company amended and
restated the warrant agreement to provide for immediate vesting of the warrant
and to permit Intermedia to exercise the warrant after seven years, or earlier
depending on the timing and amount of products purchased. The Company accounted
for the warrant as a cost of establishing a relationship with a potential
customer and recorded a one-time charge of $1,131,000 in June 2000 as a sales
and marketing cost. The Company determined the cost associated with the warrant
under the Black-Scholes option pricing model using the following assumptions:
volatility of 70%; risk-free interest rate of 6.3%; no expected dividend yield
and a term of seven years. As of June 30, 2000, there have been no sales to
Intermedia.

     In June 2000, in connection with the signing of a purchase agreement with
Broadband Office, Inc. for the sale of ASC products, the Company issued a
warrant to purchase 222,000 shares at an exercise price of $8.00 per share. The
warrant vests immediately and is exercisable at any time over the next 36
months. The Company views the issuance of this warrant as a cost of developing a
long-term business relationship and, therefore, the associated expense was
recorded as a sales and marketing cost. Therefore, in June, the Company
recognized the cost as an operating expense in the amount of $1,850,000. The
cost was determined using the Black-Scholes option pricing model and the
following assumptions: volatility of 70%; risk-free interest rate of 6.0%; no
expected dividend yield and a term of three years.

9.  STOCK OPTIONS

     In February 1998 and July 1998, the Company adopted the Advanced Switching
Communications, Inc. 1998 and Second 1998 Nonqualified Stock Option Plans
(collectively "the 1998 Plan") to offer key employees, board members and third
parties who provide valuable services to the Company the option to purchase
shares of Common Stock. Under the 1998 Plan, the Company issues options to
eligible participants at an exercise price determined by the Board of Directors,
at the date of grant. Options vest 25% annually over a period of four years from
the date of grant and expire ten years from the date of grant. Vesting may
accelerate under certain circumstances including an initial public offering,
change of ownership, liquidation or dissolution of the Company. Options will no
longer be granted under the 1998 plan.

     In December 1999, the Company adopted the Advanced Switching
Communications, Inc. 1999 Nonqualified Stock Option Plan (the "1999 Plan"). The
1999 Plan provides for option grants to employees, board members and third
parties to purchase shares of Common Stock at an exercise price determined by
the Board of Directors at the date of grant. Options vest 25% on the first
anniversary of the grant date at which time the remaining options vest monthly
over a three-year period. Options granted under the 1999 Plan expire

                                      F-16
<PAGE>   85
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

ten years from the date of grant. Vesting may accelerate under certain
circumstances such as liquidation or dissolution of the Company. The maximum
number of options available for grants under the 1999 Plan was 3,198,000 at
December 31, 1999. The Board of Directors approved an increase to this amount
subsequent to December 31, 1999 to 4,498,000 (unaudited).

     The following table presents activity under the Plans (in thousands):

<TABLE>
<CAPTION>
                                                                           WEIGHTED AVERAGE
                                                        NUMBER OF SHARES    EXERCISE PRICE
                                                        ----------------   ----------------
<S>                                                     <C>                <C>
Balance, January 1, 1998..............................          --              $  --
  Options Granted.....................................       1,651               1.05
  Options Exercised...................................          --                 --
  Options Cancelled...................................          --                 --
                                                             -----              -----
Balance, December 31, 1998............................       1,651              $1.05
  Options Granted.....................................       1,914               1.65
  Options Exercised...................................         (59)              1.14
  Options Cancelled...................................        (260)              1.50
                                                             -----              -----
Balance, December 31, 1999............................       3,246              $1.35
  Options Granted (unaudited).........................       1,324               3.77
  Options Exercised (unaudited).......................        (159)              1.23
  Options Cancelled (unaudited).......................        (222)              1.65
                                                             -----              -----
Balance, June 30, 2000 (unaudited)....................       4,189              $2.11
                                                             =====              =====
</TABLE>

     The following table summarizes information about stock options outstanding
at December 31, 1999 (amounts in thousands, except dollars):

<TABLE>
<CAPTION>
                                 OPTIONS OUTSTANDING                         VESTED OPTIONS
                  -------------------------------------------------           EXERCISABLE
      RANGE OF     NUMBER OF     WEIGHTED AVG.                        ----------------------------
      EXERCISE      SHARES         REMAINING       WEIGHTED AVERAGE     NUMBER      WEIGHTED AVG.
       PRICES     OUTSTANDING   CONTRACTUAL LIFE    EXERCISE PRICE    EXERCISABLE   EXERCISE PRICE
     ----------   -----------   ----------------   ----------------   -----------   --------------
<S>  <C>          <C>           <C>                <C>                <C>           <C>
     $     0.60        240         8.15 years           $0.60              60           $0.60
           1.00      1,043         8.49 years            1.00             225            1.00
           1.50      1,347         9.31 years            1.50              48            1.50
           1.75         40         8.75 years            1.75              10            1.75
           2.00        576         9.91 years            2.00              --            2.00
     ----------      -----         ----------           -----             ---           -----
     $0.60-2.00      3,246         9.06 years           $1.35             343           $1.02
     ==========      =====         ==========           =====             ===           =====
</TABLE>

  Valuation of Option Grants

     At various dates during the year ended December 31, 1999, the Company
granted a total of 710,408 options to employees at exercise prices below the
estimated fair market value at the dates of grant. The Company recorded
compensation expense of $42,000 for the year ended December 31, 1999 resulting
in a remaining deferred compensation balance of $761,000 at December 31, 1999.

     The Company also granted a total of 1,324,484 options at exercise prices
below the estimated fair market value at the dates of grant for the six months
ended June 30, 2000. The total expense associated with these options was
$6,942,000 which will be amortized over the option vesting period of four years.

     Had compensation cost for the Company's stock-based compensation plans been
determined based on the fair market value at the grant dates for the awards
under SFAS No. 123, the Company's historical net loss and net loss per share
would not have changed significantly from the amounts reported based upon the
fact that a charge was recorded for options whose exercise price was below the
deemed fair market value of the

                                      F-17
<PAGE>   86
                    ADVANCED SWITCHING COMMUNICATIONS, INC.

                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)

options at the grant date. In addition, all other options granted were at prices
in excess of the deemed fair market value at the grant date.

     The Company calculated the fair value of each option grant on the date of
grant using the Black-Scholes pricing model with the following weighted average
assumptions:

<TABLE>
<CAPTION>
                                                                YEAR           YEAR
                                                               ENDED          ENDED
                                                            DECEMBER 31,   DECEMBER 31,
                                                                1998           1999
                                                            ------------   ------------
<S>                                                         <C>            <C>
Risk free interest rate...................................      5.33%          5.76%
Dividend yield............................................        --             --
Expected volatility.......................................        --             --
Expected life.............................................         5              5
</TABLE>

     The weighted average fair value at date of grant for options granted during
the years ended December 31, 1998 and 1999 was $0.05, and $0.27 per share,
respectively.

10.  EMPLOYEE BENEFIT PLAN

     The Company sponsors a 401(k) defined contribution profit sharing plan
covering substantially all employees. Employees can contribute up to 15%
(subject to statutory limitations) of their total compensation. Profit sharing
contributions made by the Company are discretionary and are determined annually
by the Board of Directors. Employer contributions, if any, vest to the employees
according to a schedule entitling full vesting after four years. There have been
no Company contributions to the plan since inception.

11.  LOANS FROM EXECUTIVE OFFICERS AND STOCKHOLDERS

     Between October 7, 1997 and September 7, 1999, the Company borrowed an
aggregate of approximately $11.4 million from certain executive officers and
stockholders. Each of these loans was evidenced by an interest-bearing
promissory note and was ultimately paid in full or converted into shares of our
convertible preferred stock, as set forth in the table below.

<TABLE>
<CAPTION>
             LOANS                  CONVERSION INTO PREFERRED STOCK
--------------------------------   ---------------------------------
 DATE       AMOUNT     INT. RATE     DATE       CLASS      SHARES
-------   ----------   ---------   ---------   -------   -----------
<S>       <C>          <C>         <C>         <C>       <C>
10/7/97   $  107,143      6.5%      6/26/98     A               428
12/5/97       25,000      6.5       6/26/98     A               100
12/5/97(1)    12,500      6.5            --     --               --
 2/6/98      250,000      6.5       6/26/98     A             1,000
 3/9/98    1,750,000      6.5       6/26/98     A             7,000
6/11/98      250,000      6.5       6/26/98     A             1,000
4/20/99    1,000,000      5.0            --(2)  --               --
4/20/99    3,000,000      5.0       6/30/99     C         1,106,332
 9/7/99    2,500,000      5.0       9/10/99     D           292,412
 9/7/99    2,500,000      5.0       9/10/99     D           292,412
</TABLE>

---------------
(1) The Company repaid this loan in full together with accrued interest on July
    7, 1998.

(2) This promissory note was cancelled and the principal amount was included in
    the first $2,500,000 loan made to the Company on September 7, 1999.

12.  BUSINESS SEGMENT AND GEOGRAPHIC AREA INFORMATION

     The Company operates in one industry segment, the development of
next-generation broadband access platforms. There were no sales to any
individual country outside the United States where such sales accounted for 10%
or more of total revenue for all periods presented. For the year ended December
31, 1999, total sales to customers within the United States were $3,848,000 and
total sales to international customers were $430,000.

                                      F-18
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                    [ADVANCED SWITCHING COMMUNICATIONS LOGO]


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