VINA TECHNOLOGIES INC
S-1, 2000-05-05
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<PAGE>   1

      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 5, 2000

                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                            VINA TECHNOLOGIES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                      <C>                                      <C>
               CALIFORNIA
       (PRIOR TO REINCORPORATION)
                DELAWARE
        (AFTER REINCORPORATION)                            3661                                  77-0432782
    (STATE OR OTHER JURISDICTION OF            (PRIMARY STANDARD INDUSTRIAL                   (I.R.S. EMPLOYER
     INCORPORATION OR ORGANIZATION)            CLASSIFICATION CODE NUMBER)                  IDENTIFICATION NO.)
</TABLE>

                            VINA TECHNOLOGIES, INC.
                              42709 LAWRENCE PLACE
                               FREMONT, CA 94538
                                 (510) 492-0800
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                                STEVEN M. BAUMAN
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                            VINA TECHNOLOGIES, INC.
                              42709 LAWRENCE PLACE
                           FREMONT, CALIFORNIA 94538
                                 (510) 492-0800
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                         <C>
                      STANTON D. WONG                                             KENNETH R. LAMB
                      BLAIR W. WHITE                                             PETER T. HEILMANN
                     PATRICK J. DEVINE                                             BRIAN R. GIN
                      JASON M. VENNER                                             JONATHAN GORDON
               PILLSBURY MADISON & SUTRO LLP                                GIBSON, DUNN & CRUTCHER LLP
                       P.O. BOX 7880                                           PACIFIC TELESIS TOWER
              SAN FRANCISCO, CALIFORNIA 94120                                  ONE MONTGOMERY STREET
                      (415) 983-1000                                      SAN FRANCISCO, CALIFORNIA 94104
                   (415) 983-1200 (FAX)                                           (415) 393-8200
                                                                               (415) 986-5309 (FAX)
</TABLE>

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

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
  As soon as practicable after this Registration Statement becomes effective.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box.  [ ]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]   _____________

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]   _____________

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]   _____________

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
                            ------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                         PROPOSED
                  TITLE OF EACH CLASS OF                            MAXIMUM AGGREGATE                      AMOUNT OF
                SECURITIES TO BE REGISTERED                         OFFERING PRICE(1)                   REGISTRATION FEE
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>                                <C>
Common Stock, $.0001 par value.............................            $80,500,000                          $21,252
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457(o) of the Securities Act of 1933, as amended.
                            ------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2

        THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
        WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED
        WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS
        PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT
        SOLICITING OFFERS TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER
        OR SALE IS NOT PERMITTED.

                    SUBJECT TO COMPLETION, DATED MAY 5, 2000

PROSPECTUS

                                           SHARES

                            VINA TECHNOLOGIES, INC.

                                  [VINA LOGO]

                                  Common Stock

- --------------------------------------------------------------------------------
This is our initial public offering of shares of common stock. We are offering
               shares. No public market currently exists for our shares.

We propose to list our common stock on the Nasdaq National Market under the
symbol "VINA."

 INVESTING IN THE SHARES INVOLVES RISK. SEE "RISK FACTORS" BEGINNING ON PAGE 5.

<TABLE>
<CAPTION>
                                                              Per Share       Total
                                                              ---------       -----
<S>                                                           <C>           <C>
Public Offering Price.......................................  $             $
Underwriting Discount.......................................  $             $
Proceeds to VINA Technologies, Inc. ........................  $             $
</TABLE>

We have granted the underwriters a 30-day option to purchase up to
additional shares of common stock to cover any over-allotments.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

Lehman Brothers, on behalf of the underwriters, expects to deliver the shares on
or about                , 2000.

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

LEHMAN BROTHERS
                        THOMAS WEISEL PARTNERS LLC
                                             U.S. BANCORP PIPER JAFFRAY

                  , 2000.
<PAGE>   3

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
Prospectus Summary........................................................................    1
Risk Factors..............................................................................    5
Special Note Regarding Forward-Looking Statements.........................................   22
Use Of Proceeds...........................................................................   23
Dividend Policy...........................................................................   23
Capitalization............................................................................   24
Dilution..................................................................................   25
Selected Consolidated Financial Data......................................................   26
Management's Discussion and Analysis of Financial Condition and Results of Operations.....   28
Business..................................................................................   35
</TABLE>

<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
Management................................................................................   48
Related Party Transactions................................................................   55
Principal Stockholders....................................................................   56
Description Of Capital Stock..............................................................   58
Rescission Offer..........................................................................   61
Shares Eligible For Future Sale...........................................................   61
Underwriting..............................................................................   64
Legal Matters.............................................................................   66
Experts...................................................................................   66
Where You Can Find Additional Information.................................................   66
Index To Consolidated Financial Statements................................................  F-1
</TABLE>

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

                             ABOUT THIS PROSPECTUS

     You should rely only on the information contained in this prospectus. We
and the underwriters have not authorized anyone to provide you with information
different from that contained in this prospectus. We are offering to sell, and
seeking offers to buy, shares of common stock only in jurisdictions where offers
and sales are permitted. The information contained in this prospectus is
accurate only as of the date of this prospectus, regardless of the time of
delivery of this prospectus or of any sale of the common stock.

     This prospectus includes the following registered trademarks of VINA
Technologies: T1 Integrator, VINA, VINA Technologies, and Business
OfficeXchange. We have filed applications to register the following trademarks:
VINA HDSL Integrator, DSL eLink, VINA Multiservice Xchange, Simplifying the
first mile, and Architects of the first mile. All other trademarks and trade
names appearing in this prospectus are the property of their respective holders;
for example, SLC, ConnectReach and AnyMedia are trademarks and trade names of
Lucent Technologies. The inclusion of other companies' brand names and products
in this prospectus is not an endorsement of VINA. These companies are not
involved with the offering of our securities.

     Until               , 2000, all dealers that buy, sell or trade the common
stock, whether or not participating in this offering, may be required to deliver
a prospectus. This requirement is in addition to the dealers' obligation to
deliver a prospectus when acting as underwriters and with respect to their
unsold allotments or subscriptions.

                                        i
<PAGE>   4

                               PROSPECTUS SUMMARY

     This summary highlights some information contained elsewhere in this
prospectus. You should read the entire prospectus carefully, including the
section entitled "Risk Factors" and our financial statements and related notes,
before deciding to invest in our common stock.

                               VINA TECHNOLOGIES

     VINA Technologies is a leading developer of multiservice broadband access
communications equipment that enables communications service providers to
deliver bundled voice and data services. Our products integrate various
broadband access technologies, including both circuit- and packet-based
technologies, onto a single platform to alleviate capacity constraints in the
local loop, or first mile, of communications networks. We believe that by
integrating voice and data services onto a single broadband access platform, our
solutions decrease network access equipment costs and operating expenses for our
service provider customers. Our products also create additional revenue
opportunities for service providers by enabling them to deliver enhanced service
offerings. These services include local and long distance voice, as well as
high-speed data services, such as Internet access, business-to-business
electronic commerce, extended local area networks, outsourced applications
services and messaging. By supporting both circuit- and packet-based
technologies, our products protect service providers' existing investments in
legacy networks and offer them a clear migration path to next generation,
converged voice and data networks. They also facilitate seamless and remote
upgrades and service provisioning by our customers.

     We sell our products directly through our sales force and indirectly as an
original equipment manufacturer for Lucent Technologies and PairGain
Technologies, which sell our products to competitive local exchange carriers, or
CLECs, and incumbent local exchange carriers, or ILECs. Our largest direct and
indirect communications service provider customers include 2nd Century
Communications, Allegiance Telecom, Birch Telecom, Broadwing, Gabriel
Communications, Intermedia Communications and Time Warner Telecom.

     The volume of Internet and other data traffic has grown rapidly over the
past several years. While service providers have deployed next generation
technologies to expand the speed and capacity of long distance networks, more
limited investment has been made in local access networks. As a result, the
first mile has become the communications infrastructure's principal bottleneck.
In part to address this problem, the federal government enacted legislation to
facilitate competition in the first mile, enabling a host of competitive service
providers to enter the local access market and deploy voice and data services.
This environment poses significant challenges for service providers which must
differentiate their services in order to improve customer retention and achieve
profitability. Furthermore, the deployment of voice and data services has
resulted in the creation of parallel circuit- and packet-based networks,
challenging service providers with the expense and complexity of building and
maintaining discrete networks. Accordingly, service providers are seeking
solutions that allow them to deliver a wide variety and mix of broadband voice
and data services, while protecting their investment in legacy equipment and
ensuring a seamless migration to converged, next generation networks. This
solution must also be affordable, scalable, and easy to install and operate.

     We offer a family of products for the first mile of communications networks
designed to allow service providers to deliver cost-effectively a complete suite
of bundled voice and data services over a reduced number of network connections.
We believe that our products offer service providers the following benefits:

     - Reduced Network Complexity and Operating Cost.  Our platform-based
       solution integrates multiple products, such as routers, firewalls,
       channel banks, modems and features of private branch exchanges, or PBXs,
       which reduces the operating costs and the complexity of delivering
       bundled voice and data services.

     - Increased Value Added Services.  Our solution allows service providers to
       enhance revenue derived from their installed customer base by selling
       additional software-enabled services.

                                        1
<PAGE>   5

     - Defined Network Migration Path.  Our products offer a seamless migration
       path from the legacy, circuit-based voice network environment to the next
       generation, packet-based voice-and-data network environment.

     - Ease of Deployment.  Our platforms incorporate a software-based
       management system which facilitates installation, use and remote
       management of our products.

     - Robust Service Platform.  Our products provide telecommunications grade
       quality and reliability and are adaptable to the unpredictable course of
       first mile technology and standards developments.

     We introduced our first product, the T1 Integrator, in March 1997 and
subsequently introduced the HDSL Integrator. We believe these were the first
multiservice broadband access devices to integrate voice, data, video and
Internet services over a single broadband digital communications line. Our
Multiservice Xchange platform, introduced in May 1999, enables communications
service providers to deliver all of these broadband services and offers them a
migration path from circuit-based to packet-based environments. This is our
first product that supports both domestic and international transmission
standards. Our newest product, the DSL eLink, addresses the emerging market for
voice over DSL, or VoDSL, service transmitted over the copper communications
lines which dominate the first mile.

     Our objective is to be the leading provider of complete, integrated
solutions for the first mile. Key elements of our strategy include:

     - Enhancing strategic value to our service provider customers;

     - Expanding our product and service set to further simplify the first mile;

     - Leveraging competitive trends in the communications services market to
       accelerate deployment of our multiservice broadband access products;

     - Developing and strengthening our strategic relationships with
       communications equipment vendors and service providers;

     - Maintaining and extending the compatibility of our products with those of
       leading communications equipment vendors; and

     - Broadening our distribution channels in domestic and international
       markets.

     We were incorporated in California in June 1996 as Vina Technologies, Inc.
We plan to reincorporate in Delaware prior to the commencement of this offering
under the name VINA Technologies, Inc. Our principal executive offices are
located at 42709 Lawrence Place, Fremont, California 94538 and our telephone
number is (510) 492-0800. Our website address is www.vina-tech.com. Information
on our website does not constitute part of this prospectus.

                                        2
<PAGE>   6

                                  THE OFFERING

Common stock offered by VINA
Technologies........................                    shares

Common stock to be outstanding after
this offering.......................                    shares

Use of proceeds.....................     We expect to use the net proceeds of
                                         the offering for general corporate
                                         purposes, including working capital and
                                         capital expenditures; the acquisition
                                         of complementary businesses, products
                                         or technologies; or and expanding our
                                         domestic and international sales and
                                         marketing efforts. See "Use of
                                         Proceeds."

Proposed Nasdaq National Market
symbol..............................     VINA

                             ABOUT THIS PROSPECTUS

     Unless otherwise indicated, the information in this prospectus assumes no
exercise of the underwriters' over-allotment option.

     Unless specifically stated, all information in this prospectus:

     - reflects the conversion of all outstanding shares of our preferred stock
       into 17,694,657 shares of common stock automatically upon the closing of
       this offering; and

     - assumes our reincorporation as a Delaware corporation prior to this
       offering.

     The common stock outstanding immediately after this offering:

     - is based upon 27,861,752 common shares outstanding as of March 31, 2000,
       which assumes the conversion of all outstanding shares of preferred stock
       into shares of common stock;

     - excludes 8,481,471 shares of common stock issuable upon the exercise of
       options outstanding as of March 31, 2000, at a weighted average exercise
       price of $0.84 per share; and

     - excludes           shares of common stock available for future issuance
       under our 1998 stock plan.

                                        3
<PAGE>   7

                      SUMMARY CONSOLIDATED FINANCIAL DATA
                (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)

<TABLE>
<CAPTION>
                                        PERIOD FROM
                                       JUNE 21, 1996
                                        (INCEPTION)
                                          THROUGH              YEARS ENDED            THREE MONTHS ENDED
                                       DECEMBER 31,            DECEMBER 31,                MARCH 31,
                                       -------------   ----------------------------   -------------------
                                           1996         1997      1998       1999       1999       2000
                                       -------------   -------   -------   --------   --------   --------
<S>                                    <C>             <C>       <C>       <C>        <C>        <C>
CONSOLIDATED STATEMENTS OF OPERATIONS
  DATA:
Net revenue..........................      $  --       $   579   $ 4,393   $ 12,700   $ 2,903    $ 5,187
Gross profit(2)......................         --            37     2,339      4,987     1,417      1,948
Total costs and expenses.............        841         4,517    10,742     22,286     3,474      9,879
Loss from operations.................       (841)       (4,480)   (8,403)   (17,299)   (2,057)    (7,931)
Net loss.............................       (832)       (4,315)   (7,990)   (17,076)   (1,966)    (7,805)
Net loss per share, basic and
  diluted(1).........................        N/A       $ (4.83)  $ (2.63)  $  (3.30)  $ (0.46)   $ (1.12)
                                           =====       =======   =======   ========   =======    =======
Shares used in computation, basic and
  diluted(1).........................         --           894     3,038      5,169     4,270      6,958
                                           =====       =======   =======   ========   =======    =======
Pro forma net loss per share, basic
  and diluted(1).....................                                      $  (0.88)             $ (0.34)
                                                                           ========              =======
Shares used in pro forma computation,
  basic and diluted(1)...............                                        19,457               23,278
                                                                           ========              =======
</TABLE>

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

(1) See Notes 1 and 6 of notes to consolidated financial statements for further
    details on the determination of the number of shares used in computing per
    share data.

(2) Excludes the amortization of deferred stock compensation.

<TABLE>
<CAPTION>
                                                                  MARCH 31, 2000
                                                              ----------------------
                                                                          PRO FORMA
                                                              ACTUAL     AS ADJUSTED
                                                              -------    -----------
<S>                                                           <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments...........  $21,557
Working capital.............................................   19,443
Total assets................................................   26,966
Long-term debt, less current portion........................      404
Total shareholders' equity..................................   20,841
</TABLE>

     The preceding table presents a summary of our consolidated balance sheet
data as of March 31, 2000:

     - on an actual basis; and

     - on a pro forma, as adjusted basis to give effect to the automatic
       conversion of all of our outstanding shares of convertible preferred
       stock into 17,694,657 shares of common stock and to the sale of
                 shares of common stock in this offering at an assumed initial
       offering price of $     per share, after deducting the estimated
       underwriting discount and estimated offering expenses.

                                        4
<PAGE>   8

                                  RISK FACTORS

     You should carefully consider the risks described below before making a
decision to buy our common stock. The risks and uncertainties described below
are not the only ones we face. Additional risks and uncertainties not presently
known to us or that we currently deem immaterial may also impair our business
operations. If any of these risks actually occur, our business and financial
results could be harmed. In that case, the trading price of our common stock
could decline and you might lose all or part of your investment. You should also
refer to the other information set forth in this prospectus, including our
financial statements and the related notes.

                         RISKS RELATED TO OUR BUSINESS

BECAUSE WE HAVE A LIMITED OPERATING HISTORY AND OPERATE IN A NEW AND RAPIDLY
EVOLVING MARKET, YOU MAY HAVE DIFFICULTY ASSESSING OUR BUSINESS AND FUTURE
PROSPECTS.

     We have a very limited operating history upon which to base an investment
decision. We were incorporated in June 1996 and did not begin shipping our
products until March 1997. Due to our limited operating history, it is difficult
or impossible for us to predict our future results of operations. Investors in
our common stock must consider our business, industry and prospects in light of
the risks and difficulties typically encountered by companies in their early
stages of development, particularly those in rapidly evolving and intensely
competitive markets such as the market for broadband access equipment. In
particular, you should carefully consider the specific risks that are discussed
in more detail in this section and the disclosure elsewhere in this prospectus.

WE HAVE A HISTORY OF LOSSES, WE EXPECT FUTURE LOSSES, AND WE MAY NOT BE ABLE TO
GENERATE SUFFICIENT NET REVENUE IN THE FUTURE TO ACHIEVE OR SUSTAIN
PROFITABILITY.

     We have incurred significant losses since inception and expect that our net
losses and negative cash flow from operations will continue for the foreseeable
future. We have incurred net losses of approximately $4.3 million in 1997, $8.0
million in 1998, $17.1 million in 1999 and $7.8 million for the three months
ended March 31, 2000. As of March 31, 2000, we had an accumulated deficit of
approximately $38.0 million.

     We have large fixed expenses and expect to continue to incur significant
and increasing expenses for research and development, sales and marketing,
customer support, developing direct sales and distribution channels, and general
and administrative expenses. Given our early stage of development, our
increasing operating expenses, and the rate at which competition in our industry
is intensifying, we may not be able to adequately control our costs and expenses
or achieve or maintain adequate operating margins. To achieve profitability, we
will need to generate and sustain substantially higher revenue while maintaining
reasonable cost and expense levels. We do not know when or if we will become
profitable. If we do achieve profitability, we may not be able to sustain or
increase profitability on a quarterly or an annual basis.

A NUMBER OF FACTORS COULD CAUSE OUR QUARTERLY AND ANNUAL FINANCIAL RESULTS TO
FLUCTUATE OR BE WORSE THAN EXPECTED, WHICH COULD CAUSE OUR STOCK PRICE TO FALL.

     We believe that period-to-period comparisons of our operating results are
not a good indication of our future performance. Our quarterly operating results
have fluctuated in the past and are likely to fluctuate significantly in the
future due to a variety of factors, many of which are outside of our control.
Some of the factors that could affect our quarterly or annual operating results
include:

     - the level of market acceptance of our products;

     - fluctuation in demand for our products, which could be affected by the
       overall success of our service provider customers, and our original
       equipment manufacturer, or OEM, customers and value-added resellers, or
       VARs;
                                        5
<PAGE>   9

     - variations in the timing of orders and shipments of our products;

     - the cancellation or rescheduling of significant orders for our products;

     - the addition or loss of significant customers;

     - our ability to develop, manufacture, introduce, ship and support new
       products and product enhancements;

     - our ability to manage product transitions and adapt to technological
       advancements;

     - entry of new competitors into our market;

     - announcements and introductions of new products by us or our competitors;

     - changes in our pricing policies or the pricing policies of our
       competitors;

     - our mix of products sold;

     - channels through which our products are sold;

     - the amount and timing of our research and development expenses;

     - our ability to control costs;

     - our ability to obtain sufficient supplies of sole or limited source
       components for our products and fluctuations in the prices of these
       components;

     - the length and variability of the sales cycle for our products;

     - the timing of recognizing revenue and deferral of revenue;

     - our ability to receive and fulfill orders evenly, across any given
       quarter;

     - potential seasonality of our sales;

     - costs relating to possible acquisitions and integration of technologies
       or businesses; and

     - telecommunications market conditions and general economic conditions.

     Since inception, our order backlog at the beginning of each quarter has not
been significant, and we expect this trend to continue for the foreseeable
future. Accordingly, we must obtain substantial additional orders in a quarter
for shipments in that quarter to achieve our revenue objectives. Our sales
agreements allow purchasers to delay scheduled delivery dates without penalty.
Our customer purchase orders also allow purchasers to cancel orders within
negotiated time frames without significant penalty. In addition, due in part to
factors such as the timing of product release dates, purchase orders and product
availability, significant volume shipments of our products could occur near the
end of our fiscal quarters. If we fail to ship products by the end of a quarter,
our operating results would be adversely affected for that quarter.

     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 demands resulting from this offering and the expected 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 for
research and development than originally budgeted in order to respond to
industry trends. 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.

     For these reasons, we believe that quarterly and annual comparisons of our
operating results should not be used as an indication of our future performance.
Our quarterly or annual operating results may be below the expectations of
public market analysts and investors. This could cause the price of our common
stock to significantly decline.

                                        6
<PAGE>   10

WE RELY ON A SMALL NUMBER OF CUSTOMERS FOR SUBSTANTIAL PORTIONS OF OUR NET
REVENUES.

     We derive almost all of our net revenue from direct sales to a small number
of customers and our indirect sales through our major OEM customers that sell
and market our products. If we lose one of our customers or experience a delay
or cancellation of a significant order or a decrease in the level of purchases
from any of our customers, our net revenue could decline and our operating
results and business could be harmed. Sales through our most significant OEM
customer, Lucent Technologies, accounted for approximately 46% of our net
revenue for the year ended December 31, 1999 and approximately 28% of our net
revenue for the quarter ended March 31, 2000. Our five largest customers,
including Lucent, accounted for approximately 80% of our net revenue in 1999 and
approximately 82% for the three months ended March 31, 2000. We expect that the
telecommunications industry will continue to experience consolidation, which
could affect our customers and their relationships with us. If any of our
customers is acquired by a company that is one of our competitors' customers, we
may lose its business. Also, the ultimate business success of our direct service
provider customers, our OEM customers and VARs, and our indirect customers who
purchase our products through OEM customers and VARs, could have a significant
effect upon the demand for our products. We are unable to influence or predict
the ultimate success of these customer groups, and if they fail to successfully
implement their own business plans, we could suffer a substantial decrease in
sales of our products. In addition, any difficulty in collecting amounts due
from one or more of our key customers could harm our operating results and
financial condition.

OUR NET REVENUE COULD DECLINE SIGNIFICANTLY IF OUR RELATIONSHIPS WITH OUR MAJOR
OEM CUSTOMERS DETERIORATE.

     A significant portion of our net revenue is derived from sales to our major
OEM customers. Our agreements with our OEM customers are not exclusive and do
not contain minimum volume commitments. Our OEM agreement with Lucent expires in
May 2002. Lucent may terminate the agreement earlier upon 60 days' notice. At
any time or after a short period of notice, our OEM customers could elect to
cease marketing and selling our products. They may so elect for a number of
reasons, including the acquisition by an OEM customer of one or more of our
competitors or their technologies, or because one or more of our competitors
introduces superior or more cost-effective products. In addition, we intend to
develop and market new products that may compete directly with the products of
our OEM customers, which may also harm our relationships with these customers.
Our existing relationships with our OEM customers could make it harder for us to
establish similar relationships with our OEM customers' competitors. Any loss,
reduction, delay or cancellation in expected sales to any of our OEM customers,
or our inability to establish similar relationships with new OEM customers in
the future, would hurt our business and our ability to increase revenues and
could cause our quarterly results to fluctuate significantly.

IT IS DIFFICULT TO ACCURATELY FORECAST THE TIMING AND SIZE OF ORDERS.

     We may receive purchase orders for significant dollar amounts on an
irregular basis depending upon the timing of our customers' network deployment
and sales and marketing efforts. Because orders we receive may have short lead
times, we may not have sufficient inventory to fulfill these orders, and we may
incur significant costs in attempting to expedite and fulfill these orders. In
addition, orders expected in one quarter could shift to another because of the
timing of our customers' purchase decisions and order reductions or
cancellations. The time required for our customers to incorporate our products
into their own can vary significantly and generally exceeds several months,
which further complicates our planning processes and reduces the predictability
of our operating results. Accordingly, our revenue and operating results may
vary significantly and unexpectedly from quarter to quarter.

     Under our OEM agreements, our OEM customers have the right to delay
previously-placed orders for any reason. Delays can be caused by late deliveries
by other vendors, changes in implementation priorities, slower than anticipated
growth in demand for multiservice broadband access devices or in the capital
expenditures of our service provider customers and consolidation among our
customers.

                                        7
<PAGE>   11

     Our customers have in the past built, and may in the future build,
significant inventory in order to facilitate more rapid deployment of
anticipated major projects or for other reasons. After building a significant
inventory of our products, these parties may be faced with delays in these
anticipated major projects for various reasons. As a result, these customers may
be required to maintain a significant inventory of our products for longer
periods than they originally anticipated, which would reduce further purchases.
These reductions, in turn, could cause fluctuations in our future results of
operations and severely harm our business and financial condition.

IF WE FAIL TO CAPITALIZE ON OPPORTUNITIES TO WIN CONTRACTS FROM EXISTING AND
POTENTIAL CUSTOMERS, WE MAY NOT BE ABLE TO SELL PRODUCTS TO THOSE CUSTOMERS FOR
AN EXTENDED PERIOD OF TIME.

     Our existing and potential customers generally select a limited number of
suppliers at the beginning of a deployment cycle. As a result, if we are not
selected as one of these suppliers, we may not have an opportunity to sell
products to that customer until its next purchase cycle, which may be an
extended period of time. In addition, if we fail to win contracts from existing
and potential customers that are at an early stage in their design cycle, our
ability to sell products to these customers in the future may be adversely
affected because they may prefer to continue purchasing products from their
existing vendor. Since we rely on a small number of customers for the majority
of our sales, our failure to capitalize on limited opportunities to win
contracts with these customers would severely harm us.

WE MAY NOT BE SUCCESSFUL IF OUR CUSTOMER BASE DOES NOT GROW.

     Our future success will depend on our ability to attract additional
customers. The growth of our customer base could be adversely affected by:

     - level of customer demand for our products;

     - any delays or difficulties that we may incur in completing the
       development and introduction of our planned products or product
       enhancements;

     - new product introductions or announcements by our competitors;

     - any failure of our products to perform as expected; or

     - any difficulty we may incur in meeting customers' delivery requirements.

SINCE THE SALES CYCLES FOR OUR PRODUCTS ARE TYPICALLY LONG AND UNPREDICTABLE, WE
HAVE DIFFICULTY PREDICTING FUTURE REVENUES AND OUR REVENUE AND OPERATING RESULTS
MAY FLUCTUATE SIGNIFICANTLY.

     A customer's decision to purchase our products often involves a significant
commitment of its resources and a lengthy evaluation and product qualification
process. Our sales cycles typically last from nine months to one year. As a
result, we may incur substantial sales and marketing expenses and expend
significant management effort without any assurance of a sale. Long sales cycles
also subject us to other risks, including customers' budgetary constraints,
internal acceptance reviews and order reductions or cancellations.

     Even after deciding to purchase our products, our customers often deploy
our products slowly. Timing of deployment can vary widely and depends on:

     - the technical abilities and resources of our customers;

     - the size of the network deployment;

     - the complexity of our customers' network;

     - the hardware and software configuration necessary to deploy our products;
       and

     - our customers' ability to finance their purchase of our products as well
       as their operations.

                                        8
<PAGE>   12

WE DEPEND UPON A SINGLE CONTRACTOR TO MANUFACTURE OUR PRODUCTS, SO TERMINATION
OF THIS CONTRACT WILL IMPOSE SIGNIFICANT COSTS ON US AND COULD HARM OR INTERFERE
WITH OUR ABILITY TO MEET SCHEDULED PRODUCT DELIVERIES.

     We do not have internal manufacturing capabilities. We have relied on a
sole manufacturer, PCB Assembly, Inc., to build our products. PCB Assembly was
recently acquired by Flextronics International Limited. Although our contract
remains in effect, Flextronics may cancel it on 60 days' notice and is not
obligated to supply products to us for any specific period, in any specific
quantity or at any specific price, except as may be provided in a particular
purchase order. Our reliance on Flextronics involves a number of risks,
including the lack of operating history between us and Flextronics, the absence
of control over our manufacturing capacity, the unavailability of, or
interruptions in, access to process technologies and reduced control over
component availability, delivery schedules, manufacturing yields and costs. If
Flextronics is unable or unwilling to manufacture our products in required
volumes and at high quality levels, we will have to identify and qualify
acceptable alternative manufacturers, which would result in substantial
manufacturing delays and cause us to incur significant costs. It is possible
that an alternate source may not be available to us when needed or be in a
position to satisfy our production requirements at acceptable prices and
quality. If our contract manufacturer fails to build products of sufficient
quality or quantity, our reputation and sales will be harmed. Any significant
interruption in manufacturing would harm our ability to meet our scheduled
product deliveries to our customers, and could cause the loss of existing or
potential customers. Flextronics also builds products for other companies, and
we cannot be certain that they will always have sufficient quantities of
inventory available to meet our production requirements, or that they will
allocate their internal resources to fill our orders on a timely basis.

WE DEPEND ON SOLE SOURCE AND LIMITED SOURCE SUPPLIERS FOR KEY COMPONENTS. IF WE
ARE UNABLE TO BUY COMPONENTS ON A TIMELY BASIS, WE WILL NOT BE ABLE TO DELIVER
OUR PRODUCTS TO OUR CUSTOMERS ON TIME, AND IF WE PURCHASE EXCESS COMPONENTS TO
REDUCE THIS RISK, WE MAY INCUR SIGNIFICANT INVENTORY COSTS.

     We currently provide forecasts of our demand to our contract manufacturer
12 months prior to scheduled delivery of products to our customers. Lead times
for the materials and components that we order vary significantly and depend on
numerous factors, including the specific supplier, contract terms and demand for
a component at a given time. We obtain several of the key components used in our
products from single or limited sources of supply. We have encountered, and
expect in the future to encounter, difficulty in obtaining these components from
our suppliers. As recently as the fourth quarter of 1999, we experienced a
severe shortage of components, particularly subscriber line interface circuits,
which jeopardized our ability to deliver our products in a timely fashion. The
suppliers of our components range from small vendors to large established
companies. Components for which we currently have only a single source include
subscriber line interface circuits that we purchase from Advanced Micro Devices
and microprocessors that we purchase from Motorola Corporation. Components for
which we currently have limited sources include digital signal processors,
digital subscriber line modules and flash memory. We purchase most components on
a purchase order basis and we do not have guaranteed supply arrangements with
most of our key suppliers. We or our contract manufacturer may not be able to
obtain necessary supplies in a timely manner. Financial or other difficulties
faced by our suppliers or significant changes in demand for these components
could limit the availability of these components to us at acceptable prices and
on a timely basis, if at all.

     We have limited control over the quality of the components supplied and the
timing of deliveries by our suppliers because of our limited supply
relationships. In addition, any of our key suppliers could be acquired by, or
enter into exclusive arrangements with, our competitors, stop selling their
products or components to us at commercially reasonable prices, or refuse to
sell their products or components to us altogether. Any interruption or delay in
the supply of any of these components, or our inability to obtain these
components from alternate sources at acceptable prices and within a reasonable
amount of time, would limit our ability to meet scheduled product deliveries to
our customers and would harm our sales and business. If we are unable to obtain
adequate supplies of key components, we may be unable to produce our products or
be forced to reengineer our products, which may hurt our gross margins and our

                                        9
<PAGE>   13

ability to deliver products on a timely basis, if at all. A substantial period
of time could be required before we would begin receiving adequate supplies from
alternative suppliers, if available. In addition, qualifying additional
suppliers is time consuming and expensive and exposes us to potential supplier
production difficulties or quality variations.

     If we overestimate our component requirements, our contract manufacturer
may purchase excess inventory. For those parts that are unique to our products,
we could be required to pay for these excess parts and recognize related
inventory write-down costs. If we underestimate our requirements, our contract
manufacturer may have an inadequate inventory, which could interrupt
manufacturing of our products and result in delays in shipments and revenue.

OUR FAILURE TO ENHANCE OUR EXISTING PRODUCTS OR DEVELOP AND INTRODUCE NEW
PRODUCTS THAT MEET CHANGING CUSTOMER REQUIREMENTS AND TECHNOLOGICAL ADVANCES
WOULD LIMIT OUR ABILITY TO SELL OUR PRODUCTS.

     The telecommunications industry is undergoing a period of rapid
technological innovation that could cause substantial changes in supplier and
customer relationships, changes in end-user requirements, frequent new product
introductions, and changes in voice and data service offerings by service
providers. Our future success will depend significantly on our ability to
anticipate or adapt to those changes and to offer, on a timely and
cost-effective basis, products that meet changing customer demands and industry
standards. For example, the current shifting of the industry away from
circuit-based technology toward technologies based on delivering data in packets
may occur more quickly than we expect or we may be able to react. Also, a new
technology could gain favor in the market more quickly than we could respond.

     Developing new or enhanced products is a complex and uncertain process and
we may not have sufficient resources to successfully and accurately anticipate
technological and market trends, or to successfully manage long development
cycles. We may also experience design, manufacturing, marketing and other
difficulties that could delay or prevent our development, introduction or
marketing of new products and enhancements. We must manage the transition from
older products to new or enhanced products to minimize disruption in customer
ordering patterns and ensure that adequate supplies of new products are
available for delivery to meet anticipated customer demand. We expect to
continue to work with other companies that provide products that complement our
products, such as vendors of voice over digital subscriber line products. Our
products must work with those other companies' products so together we can offer
our customers a broader solution for their telecommunications needs. We may be
unable to develop or maintain relationships with some of these other companies,
and some of these companies may also be our competitors. Any significant delay
or failure to release new products or product enhancements on a timely and
cost-effective basis could harm our reputation and customer relationships,
provide a competitor with a first-to-market opportunity or allow a competitor to
achieve greater market share.

     In developing our products, we have made, and will continue to make,
assumptions about the standards that may be adopted by our customers and
competitors. If the standards adopted are different from those which we have
chosen to support, market acceptance of our products may be significantly
reduced or delayed.

     In addition, the introduction of products incorporating new technologies
and the emergence of new industry standards could render our existing products
obsolete. In order to introduce products incorporating new technologies and new
industry standards, we must be able to gain access to the latest technologies of
our customers, our suppliers and other vendors. Any failure to gain access to
the latest technologies could impair the competitiveness of our products.

IF WE ARE UNABLE TO DEVELOP AND MAINTAIN STRATEGIC RELATIONSHIPS WITH THIRD
PARTIES OUR ABILITY TO OPERATE AND GROW OUR BUSINESS MAY BE HARMED.

     Our success will depend on our ability to develop and maintain strategic
relationships. It is important that we continue to leverage our OEM customer
relationships with major parties such as Lucent to support both our domestic and
planned international distribution and sales operations. Many of our strategic
relationships are relatively new, and we cannot be certain that any significant
revenue will be
                                       10
<PAGE>   14

derived from those arrangements. We also depend on these relationships for
access to information on technical developments and specifications we need to
develop our products. We cannot control the amount and timing of resources which
our strategic partners devote to our business, and our strategic partners may
not meet their obligations as expected. We also may not be able to predict which
existing or potential partners will develop leading technologies or industry
standards. We may not be able to maintain or develop strategic relationships or
replace strategic partners that we lose. If we fail to develop or maintain
strategic relationships with companies that develop the necessary technologies
or create the industry standards, our products could become obsolete. We could
also be at a competitive disadvantage in attempting to negotiate relationships
with those potential partners in the future. In addition, if any strategic
partner breaches or terminates its relationship with us, we may not be able to
sustain or grow our business.

IF WE ARE UNABLE TO ATTRACT AND RETAIN KEY PERSONNEL, WE MAY NOT BE ABLE TO
SUSTAIN OR GROW OUR BUSINESS AND SUCCESSFULLY ACHIEVE OUR OBJECTIVES.

     Our success depends to a significant degree upon the continued
contributions of the principal members of our sales, marketing, engineering and
management personnel, many of whom would be difficult to replace. None of our
officers or key employees is bound by an employment agreement for any specific
term, and we do not have "key person" life insurance policies covering any of
our employees. If we lose the services of any key personnel, particularly senior
management, sales personnel and engineers, our business could be severely
harmed.

     The competition for qualified personnel is particularly intense in our
industry and in Northern California, where there is a high concentration of
established and emerging growth technology companies. This competition makes it
more difficult to retain our key personnel and to recruit new highly qualified
personnel. To attract and retain qualified personnel, we may be required to
grant large option or other stock-based incentive awards, which may be highly
dilutive to existing stockholders. We may also be required to pay significant
base salaries and cash bonuses to attract and retain these individuals, which
could harm our operating results. In particular, we have experienced difficulty
in hiring software and system test engineers and engineers with voice and data
experience. We believe that we will continue to experience difficulty in
recruiting and retaining qualified personnel in the future. If we are not able
to attract and retain the necessary personnel, we could face delays in
developing our products and implementing our sales and marketing plans, and we
may not be able to grow our business.

BECAUSE OF OUR LONG PRODUCT DEVELOPMENT PROCESS, WE INCUR SUBSTANTIAL EXPENSES
BEFORE WE REALIZE ASSOCIATED REVENUES.

     The development of new or enhanced products is a complex and uncertain
process. We may experience design, manufacturing, marketing and other
difficulties that could delay or prevent the development, introduction or
marketing of new products and enhancements. Development costs and expenses are
incurred before we generate any revenues from sales of products resulting from
these efforts. Our total research and development expenses were approximately
$1.9 million in 1997, $4.2 million in 1998, $6.7 million in 1999 and $2.5
million for the three months ended March 31, 2000. We intend to continue to
incur substantial research and development expenses, which could have a negative
impact on our earnings in future periods.

OUR BUSINESS WILL BE HARMED IF WE FAIL TO MANAGE EFFECTIVELY THE GROWTH OF OUR
OPERATIONS.

     We have rapidly and significantly expanded our operations in recent periods
and expect to continue to do so. This expansion significantly strains our
managerial, operational and financial resources. Some of our senior management
personnel joined us within the last 12 months, including a number of key
managerial, technical and operations personnel whom we have not yet fully
integrated. Our President, Vice President of Finance and Administration, Vice
President of Marketing, Vice President of Operations and Vice

                                       11
<PAGE>   15

President of Sales have all joined us since June 1999. To manage the expected
growth of our operations and personnel, we will be required to:

     - improve existing and implement new operational, financial and management
       controls, reporting systems and procedures;

     - hire, train, motivate and manage additional qualified personnel;

     - expand access to additional manufacturing capacity;

     - effectively manage multiple relationships with our customers, suppliers,
       distributors and other third parties; and

     - coordinate our domestic and international operations and establish the
       necessary infrastructure to implement our international strategy.

     If we are not able to manage our growth in an efficient and timely manner,
our business will be severely harmed.

THE RAPID GROWTH OF OUR BUSINESS HAS REQUIRED US TO EXPAND OUR FACILITIES BY
OBTAINING ADDITIONAL OFFICE SPACE. IF WE FAIL TO PROPERLY MANAGE THE DEPLOYMENT
OF THESE NEW FACILITIES THERE COULD BE A DISRUPTION IN OUR OPERATIONS.

     Our success depends, to a large degree, on the efficient and uninterrupted
operation of our facilities. Our current facilities will not be sufficient to
accommodate our anticipated growth. We are in the process of negotiating a lease
for additional facilities located in Fremont, California, and currently plan to
move into this facility by August 2000. Relocating a portion of our employees
could cause temporary disruptions in our operations and divert management's
attention, due to factors such as computer network reconfigurations, telephone
and customer service transitions, equipment loss or damage by moving companies
and delays caused by movers. If complications relating to the move arise or if
we do not sign a lease and we are not able to relocate these functions by the
end of July 2000, we may need to obtain temporary additional office space.
Because of acute shortages in Northern California office space, we cannot assure
you that we will be able to locate suitable temporary office space on acceptable
terms or at all.

WE PLAN TO INVEST A SIGNIFICANT AMOUNT OF OUR RESOURCES TO MARKET AND SELL OUR
PRODUCTS; HOWEVER, IF WE ARE UNABLE TO EXPAND OUR SALES AND MARKETING
OPERATIONS, WE WILL NOT BE ABLE TO ACHIEVE BRAND AWARENESS FOR OUR PRODUCTS AND
GENERATE ADDITIONAL SALES.

     The products and services we offer are generally of a highly technical
nature and require a sophisticated sales and marketing effort targeted at
several key people within each of our prospective customers' organizations. We
plan to invest a significant amount of our resources to develop, market and sell
our products. Accordingly, our success will depend on our ability to generate
sufficient revenue from sales of these products to offset the expenses
associated with developing, marketing and selling them. We have recently
expanded our direct sales force and plan to hire additional sales personnel and
system and consulting engineers. We might not be able to hire the kind and
number of marketing and sales personnel and system and consulting engineers that
we need. We have only recently hired our Vice President of Marketing and plan to
hire additional marketing professionals. Further, many of our competitors have
significantly larger marketing budgets and sales forces than we have. As a
result, we may not be able to create sufficient brand awareness to generate
additional sales of our products. In addition, if our products exhibit poor
performance or other defects, our brand may be significantly diluted, which
would inhibit our ability to attract or retain customers.

                                       12
<PAGE>   16

WE HAVE NO SIGNIFICANT EXPERIENCE OPERATING IN INTERNATIONAL MARKETS AND MAY NOT
SUCCESSFULLY ESTABLISH AND MANAGE OUR INTERNATIONAL OPERATIONS.

     We have sales and customer support personnel in the United Kingdom and have
initiated distribution relationships covering Germany, France, Australia and New
Zealand. We intend to further expand our international operations and enter new
markets. This expansion will require significant management attention and
financial resources. We have limited experience in marketing and distributing
our products internationally and in developing versions of our products that
comply with local standards. In addition, our international operations will be
subject to other inherent risks, including:

     - the failure to adopt regulatory changes that facilitate the provisioning
       of competitive communications services;

     - difficulties adhering to international protocol standards;

     - difficulties and costs of staffing and managing foreign operations;

     - transportation delays and interruptions;

     - longer sales cycles;

     - the complexities of managing operations in various geographic locations;

     - expenses associated with customizing products for other countries;

     - dependence on strategic relationships with international distribution
       partners and local vendors;

     - protectionist laws and business practices that favor local competition;

     - reduced protection for intellectual property rights in some countries;

     - difficulties enforcing agreements through other legal systems and in
       complying with foreign laws;

     - greater difficulty in collecting accounts receivable;

     - fluctuations in currency exchange rates;

     - political and economic instability;

     - import or export licensing requirements; and

     - potential adverse tax consequences.

IF OUR PRODUCTS CONTAIN UNDETECTED SOFTWARE OR HARDWARE ERRORS, WE COULD INCUR
SIGNIFICANT UNEXPECTED EXPENSES, EXPERIENCE PRODUCT RETURNS AND LOST SALES AND
BE SUBJECT TO PRODUCT LIABILITY CLAIMS.

     Our products are highly technical and are designed to be deployed in very
large and complex networks. While we have tested our products, because of their
nature, they can only be fully tested when deployed in networks that generate
high amounts of voice or data traffic. Because of our short operating history,
our products have not yet been broadly deployed. Consequently, our customers may
discover errors or defects in our products after they have been broadly
deployed. In addition, our customers may use our products in conjunction with
products from other vendors. As a result, when problems occur, it may be
difficult to identify the source of the problem. Any defects or errors in our
products discovered in the future, or failures of our customers' networks,
whether caused by our products or another vendor's products, could result in:

     - loss of, or delay in, revenue and loss of market share;

     - product returns;

     - product liability claims and legal actions by our customers;

     - negative publicity regarding us and our products;

                                       13
<PAGE>   17

     - loss of customers;

     - failure to attract new customers;

     - unexpected expenses to remedy errors;

     - diversion of our development resources;

     - increased service warranty and repair costs; and

     - increased insurance costs.

     We may be subject to significant liability claims because our products are
used in connection with critical communications services. Our agreements with
customers typically contain provisions intended to limit our exposure to
liability claims. However, these limitations may not preclude all potential
claims resulting from a defect in one of our products. Liability claims could
require us to spend significant time and money in litigation or to pay
significant damages. Any of these claims, whether or not successful, could
seriously damage our reputation and business.

IF OUR PRODUCTS ARE NOT COMPATIBLE WITH OTHER COMPANIES' PRODUCTS WITHIN OUR
CUSTOMERS' NETWORKS, ORDERS WILL BE DELAYED OR CANCELLED AND SUBSTANTIAL PRODUCT
RETURNS COULD OCCUR.

     Many of our customers require that our products be designed to work with
their existing networks, each of which may have different specifications and
utilize multiple protocols that govern the way devices on the network
communicate with each other. Our customers' networks may contain multiple
generations of products from different vendors that have been added over time as
their networks have grown and evolved. Our products may be required to work with
these products as well as with future products in order to meet our customers'
requirements. In some cases, we may be required to modify our product designs to
achieve a sale, which may result in a longer sales cycle, increased research and
development expense, and reduced operating margins. If our products are not
compatible with existing equipment in our customers' networks, whether open or
proprietary, installations could be delayed, orders for our products could be
cancelled or our products could be returned.

IF WE DO NOT EXPAND OUR CUSTOMER SERVICE AND SUPPORT ORGANIZATION, WE WILL NOT
BE ABLE TO PROVIDE THE LEVEL OF SERVICE REQUIRED TO ESTABLISH STRONG
RELATIONSHIPS WITH OUR CUSTOMERS.

     The complex nature of our products requires us to provide our customers
with a high level of service and support by highly trained customer service and
support personnel. We currently have a small customer service and support
organization, and we will need to increase these resources to support any
increases in the needs of our existing and new customers. Hiring customer
service and support personnel in our industry is very competitive due to the
limited number of people available with the necessary technical skills and
understanding of our technologies. We currently plan to use Timeplex, Inc. to
install and maintain our products, including in connection with our planned
international expansion, when our customers request these services. Our
agreement with Timeplex expires in August 2001, and may be terminated earlier
upon 60 days' notice. If our relationship with Timeplex ends, we may be unable
to find a replacement or to establish the necessary capabilities internally. If
we are unable to expand or maintain our customer service and support
organization, or if Timeplex fails to install or maintain our products
appropriately, our customers may become dissatisfied and we could lose customers
and our reputation could be harmed. A reputation for poor service would prevent
us from increasing sales to existing or new customers.

                                       14
<PAGE>   18

WE DO NOT CURRENTLY PROVIDE INITIAL CUSTOMER SUPPORT TO MANY END-USER CUSTOMERS
USING OUR PRODUCTS; IF END-USER CUSTOMERS DO NOT RECEIVE ADEQUATE CUSTOMER
SERVICE AND SUPPORT FROM OUR OEM CUSTOMERS AND VARS, SALES OF OUR PRODUCTS MAY
BE SIGNIFICANTLY REDUCED AND OUR ABILITY TO SUSTAIN OR GROW OUR BUSINESS MAY BE
HARMED.

     Our ability to continue to grow and to retain current and future customers
is affected by the quality of the customer service and support provided by our
distribution channels. Accordingly, we have little control over the quality and
responsiveness of the customer service and support that end users receive until
they contact us directly. We provide initial support to our direct customers and
back-up support to our distribution channels. The failure by us or distribution
channels to offer adequate customer support to end users could harm our
reputation or cause demand for our products to decline.

FAILURE TO PROTECT OUR INTELLECTUAL PROPERTY WILL LIMIT OUR ABILITY TO COMPETE.

     Our success and ability to compete depend substantially on our proprietary
technology. Any infringement of our proprietary rights could result in
significant litigation costs, and any failure to adequately protect our
proprietary rights could result in our competitors offering similar products,
potentially resulting in loss of a competitive advantage and decreased revenue.
We rely on a combination of patent, copyright, trademark and trade secret laws,
as well as confidentiality agreements and licensing arrangements, to establish
and protect our proprietary rights. We presently have two U.S. patent
applications pending, but no issued patents. Despite our efforts to protect our
proprietary rights, existing copyright, trademark and trade secret laws afford
only limited protection. In addition, the laws of many foreign countries do not
protect our proprietary rights to the same extent as do the laws of the United
States. Attempts may be made to copy or reverse engineer aspects of our products
or to obtain and use information that we regard as proprietary. Accordingly, we
may not be able to protect our proprietary rights against unauthorized
third-party copying or use. Furthermore, policing the unauthorized use of our
products is difficult. Litigation may be necessary in the future to enforce our
intellectual property rights, to protect our trade secrets or to determine the
validity and scope of the proprietary rights of others. This litigation could
result in substantial costs and diversion of resources and may not ultimately be
successful.

WE MAY BE SUBJECT TO INTELLECTUAL PROPERTY INFRINGEMENT CLAIMS THAT ARE COSTLY
TO DEFEND AND COULD LIMIT OUR ABILITY TO USE SOME TECHNOLOGIES IN THE FUTURE.

     Our industry is characterized by frequent intellectual property litigation
based on allegations of infringement of intellectual property rights. From time
to time, third parties have asserted, and may assert in the future, patent,
copyright, trademark and other intellectual property rights to technologies or
rights that are important to our business. In addition, in our agreements, we
may agree to indemnify our customers for any expenses or liabilities resulting
from claimed infringements of patents, trademarks or copyrights of third
parties. Any claims asserting that our products infringe or may infringe the
proprietary rights of third parties, with or without merit, could be
time-consuming, resulting in costly litigation and diverting the efforts of our
technical and management personnel. These claims could cause us to stop selling,
incorporating or using our products that use the challenged intellectual
property and could also result in product shipment delays or require us to
redesign or modify our products or enter into licensing agreements. These
licensing agreements, if required, would increase our product costs and may not
be available on terms acceptable to us, if at all.

     We may be a party to litigation involving intellectual property claims
against us in the future. We also cannot assure you that we would prevail in any
such actions, given their complex technical issues and inherent uncertainties.
Although we carry general liability insurance, our insurance may not cover
potential claims of this type or may not be adequate to indemnify us for all
liability that may be imposed. If there is a successful claim of infringement or
we fail to develop non-infringing technology or license the proprietary rights
on a timely basis, our business could be harmed.

                                       15
<PAGE>   19

IF NECESSARY LICENSES OF THIRD-PARTY TECHNOLOGY ARE NOT AVAILABLE TO US OR ARE
VERY EXPENSIVE, WE MAY BE UNABLE TO DEVELOP NEW PRODUCTS OR PRODUCT
ENHANCEMENTS.

     From time to time we may be required to license technology from third
parties to develop new products or product enhancements. These third-party
licenses may not be available to us on commercially reasonable terms, if at all.
Our inability to obtain necessary third-party licenses may force us to obtain
substitute technology of lower quality or performance standards or at greater
cost, any of which could seriously harm the competitiveness of our products.

IF A NATURAL DISASTER OCCURS, OUR BUSINESS COULD BE SHUT DOWN OR SEVERELY
IMPACTED.

     Our business and operations depend on the extent to which our facility and
products are protected against damage from fire, earthquakes, power loss and
similar events. Despite precautions taken by us, a natural disaster or other
unanticipated problem could, among other things, hinder our research and
development efforts, delay the shipment of our products and affect our ability
to receive and fulfill orders. For example, since we conduct all of our final
assembly and tests in one location, any fire or other disaster at the assembly
facility would severely harm our business. In addition, our headquarters are
located in Northern California, which is a region containing active earthquake
faults.

        RISKS ASSOCIATED WITH THE MULTISERVICE BROADBAND ACCESS INDUSTRY

INTENSE COMPETITION COULD PREVENT US FROM INCREASING OR SUSTAINING OUR REVENUE
AND PREVENT US FROM ACHIEVING OR SUSTAINING PROFITABILITY.

     The market for multiservice broadband access products is highly
competitive. We compete directly with numerous companies, including Accelerated
Networks, Inc., ADTRAN, Inc., Carrier Access Corporation, Cisco Systems, Inc.,
Efficient Networks, Inc., Lucent Technologies, Inc., Nortel Networks, Inc. and
Sonoma Systems, Inc. Many of our current and potential competitors have longer
operating histories, significantly greater selling and marketing, technical,
manufacturing, financial, customer support, professional services and other
resources, including vendor-sponsored financing programs. As a result, these
competitors are able to devote greater resources to the development, promotion,
sale and support of their products. In addition, our competitors may foresee the
course of market developments more accurately than we do and could develop new
technologies that compete with our products or even render our products
obsolete. We may not have sufficient resources to continue to make the
investments or achieve the technological advances necessary to compete
successfully with existing or new competitors. In addition, due to the rapidly
evolving markets in which we compete, additional competitors with significant
market presence and financial resources, including other large
telecommunications equipment manufacturers, may enter our markets, thereby
further intensifying competition.

     The markets in which we compete are characterized by increasing
consolidation, as exemplified by the recent or pending acquisitions of Promatory
Communications, Inc. by Nortel Networks, FlowPoint Corporation by Efficient
Networks, Inc., PairGain Technologies, Inc. by ADC Telecommunications, Inc. and
Newbridge Networks Corporation by Alcatel. We cannot predict how industry
consolidation will affect our competitors and we may not be able to compete
successfully in an increasingly consolidated industry. Additionally, because we
are dependent on strategic relationships with third parties in our industry, any
consolidation involving these parties could reduce the demand for our products
and otherwise harm our business prospects. Our competitors that have large
market capitalizations or cash reserves are also better positioned than we are
to acquire other companies, including our competitors, thereby increasing market
share or obtaining new technologies or products that may displace our product
lines. Any of these acquisitions could give our competitors a strategic
advantage that could adversely affect demand for our products.

     In addition, many of our competitors have much greater name recognition and
have a more extensive customer base, broader customer relationships, significant
financing programs and broader product offerings than we do. These companies can
adopt aggressive pricing policies and leverage their customer bases and
                                       16
<PAGE>   20

broader product offerings to gain market share. We have encountered, and expect
to continue to encounter, potential customers that, due to existing
relationships with our competitors, are committed to the product offerings of
these competitors. As a result, these potential customers may not consider
purchasing our products.

     We believe that our existing OEM customers continuously evaluate whether to
offer their own multiservice broadband access devices. If any of our OEM
customers decides to internally design and sell its own multiservice broadband
access devices, or acquire one or more of our competitors or their broadband
access technologies, it could eliminate or substantially reduce its purchases of
our products. In addition, our current growth may cause some OEM customers to
view us as greater competition. Our OEM relationships could also be harmed as we
develop and market new products that may compete directly with the products of
our OEM customers. We cannot assure you that any of our OEM customers will
continue to rely, or expand their reliance, on us as an external source of
supply for their multiservice broadband access devices. Because we rely on only
a few OEM customers for a substantial portion of our revenues, any loss of sales
to these OEM customers would seriously harm our business, financial condition
and results of operations.

OUR PRODUCTS ARE SUBJECT TO PRICE REDUCTION AND MARGIN PRESSURES.

     In the past, competitive pressures have forced us to reduce the prices of
our products. In the second quarter of 1999, we reduced the price of our T1
Integrator product line in response to competition, which reduced our gross
margins in subsequent periods. We expect similar price reductions to occur in
the future in response to competitive pressures. In addition, our average
selling prices decline when we negotiate volume price discounts with customers
and utilize indirect distribution channels. If our average selling prices
decline and we fail to offset that decline through cost reductions, our gross
margins and potential profitability would be seriously harmed.

SALES OF OUR PRODUCTS DEPEND ON THE WIDESPREAD ADOPTION OF MULTISERVICE
BROADBAND ACCESS SERVICES AND IF THE DEMAND FOR MULTISERVICE BROADBAND ACCESS
SERVICES DOES NOT DEVELOP, THEN OUR RESULTS OF OPERATIONS AND FINANCIAL
CONDITION WOULD BE HARMED.

     Our business will be harmed if the demand for multiservice broadband access
services does not increase as rapidly as we anticipate, or if our customers'
multiservice broadband access service offerings are not well received in the
marketplace. Critical factors affecting the development of the multiservice
broadband access services market include:

     - the development of a viable business model for multiservice broadband
       access services, including the capability to market, sell, install and
       maintain these services;

     - cost constraints, such as installation, space and power requirements at
       ILEC central offices;

     - compatibility of equipment from multiple vendors in service provider
       networks;

     - evolving industry standards for transmission technologies and transport
       protocols;

     - varying and uncertain conditions of the communications network
       infrastructure, including quality and complexity, electrical
       interference, and crossover interference with voice and data
       telecommunications services;

     - domestic and foreign government regulation; and

     - the ability of CLECs to obtain sufficient funding and to successfully
       grow their businesses.

     The market for multiservice broadband access devices may fail to develop
for other reasons or may develop more slowly than anticipated, which would harm
our business.

                                       17
<PAGE>   21

IF WE FAIL TO COMPLY WITH REGULATIONS AND EVOLVING INDUSTRY STANDARDS, SALES OF
OUR EXISTING AND FUTURE PRODUCTS COULD BE HARMED.

     The markets for our products are characterized by a significant number of
communications regulations and standards, some of which are evolving as new
technologies are deployed. Our customers may require our products to comply with
various standards, including those promulgated by the Federal Communications
Commission, or FCC, standards established by Underwriters Laboratories and
Telcordia Technologies or proprietary standards promoted by our competitors. In
addition, our key competitors may establish proprietary standards which they
might not make available to us. As a result, we may not be able to achieve
compatibility with their products. Internationally, we may also be required to
comply with standards established by telecommunications authorities in various
countries as well as with recommendations of the International
Telecommunications Union.

     Our customers may also require, or we may otherwise deem it necessary or
advisable, that we modify our products to address actual or anticipated changes
in the regulatory environment. Failure of our products to comply, or delays in
compliance, with the various existing, anticipated and evolving industry
regulations and standards could decrease sales of our existing and future
products. Moreover, the enactment of new laws or regulations, changes in the
interpretation of existing laws or regulations or a reversal of the trend toward
deregulation in the telecommunications industry, could affect our customers, and
thereby harm our business.

OUR CUSTOMERS ARE SUBJECT TO GOVERNMENT REGULATION, AND CHANGES IN CURRENT OR
FUTURE LAWS OR REGULATIONS THAT NEGATIVELY IMPACT OUR CUSTOMERS COULD HARM OUR
BUSINESS.

     The jurisdiction of the FCC extends to the entire communications industry,
including our customers. Future FCC regulations affecting the broadband access
industry, our customers or their service offerings may harm our business. For
example, FCC regulatory policies that affect the availability of data and
Internet services may impede our customers' penetration into markets or affect
the prices that they are able to charge. In addition, international regulatory
bodies are beginning to adopt standards and regulations for the broadband access
industry. If our customers are hurt by laws or regulations regarding their
business, products or service offerings, demand for our products may decrease.

                ADDITIONAL RISKS THAT MAY AFFECT OUR STOCK PRICE

OUR STOCK PRICE MAY BE VOLATILE, AND YOU MAY NOT BE ABLE TO RESELL OUR SHARES AT
OR ABOVE THE PRICE YOU PAID, OR AT ALL.

     There has previously not been a public market for our common stock. We
cannot predict the extent to which investor interest in our stock will lead to
the development of a trading market or how liquid that market might become. The
initial public offering price for the shares will be determined by negotiations
between us and the representatives of the underwriters and may not be indicative
of prices that will prevail in the trading market. The trading price of our
common stock could be subject to wide fluctuations in response to factors such
as:

     - actual or anticipated variations in our quarterly operating results;

     - our loss of customers;

     - changes in financial estimates by securities analysts and failure to meet
       analyst predictions and projections;

     - changes in market valuations of broadband access equipment companies;

     - announcements of technological innovations;

     - new products or services introduced or offered by us or our competitors;

                                       18
<PAGE>   22

     - announcements of significant acquisitions, strategic partnerships, joint
       ventures or capital commitments by us or our competitors;

     - additions or departures of key personnel; and

     - our sales of common stock or other securities in the future.

     In addition, the stock market in general, and the Nasdaq National Market
and technology companies in particular, have experienced extreme price and
volume fluctuations that have often been unrelated or disproportionate to the
operating performance of companies. The trading prices and valuations of many
technology companies are substantially above historical levels. These trading
prices and valuations may not be sustainable. These broad market and industry
factors may decrease the market price of our common stock, regardless of our
actual operating performance.

     In addition, in the past, following periods of volatility in the overall
market and the market price of a company's securities, securities class action
litigation has often been instituted against these companies. This litigation,
if instituted against us, could result in substantial costs and a diversion of
our management's attention and resources.

OUR MANAGEMENT HAS BROAD DISCRETION AS TO HOW TO USE THE PROCEEDS FROM THIS
OFFERING AND THE PROCEEDS MAY NOT BE USED IN A MANNER WITH WHICH YOU AGREE.

     We intend to use the proceeds from this offering for general corporate
purposes, including working capital and capital expenditures, and we may use a
portion of the proceeds to acquire complementary businesses, products or
technologies and expand our sales and marketing efforts. We will have broad
discretion over how we use these proceeds. You will not have the opportunity to
evaluate the economic, financial or other information on which we base our
decisions regarding how to use the proceeds from this offering, and we may spend
these proceeds in ways with which you may disagree. Pending any of these uses,
we plan to invest the proceeds of this offering in short-term, investment-grade,
interest-bearing securities. We cannot predict whether these investments will
yield a favorable return. See "Use of Proceeds."

WE MAY ENGAGE IN FUTURE ACQUISITIONS OR STRATEGIC INVESTMENTS THAT WE MAY NOT BE
ABLE TO SUCCESSFULLY INTEGRATE OR MANAGE, AND THESE ACQUISITIONS OR STRATEGIC
INVESTMENTS MAY DILUTE OUR STOCKHOLDERS AND CAUSE US TO INCUR DEBT AND ASSUME
CONTINGENT LIABILITIES.

     We may review acquisition prospects and strategic investments that could
complement our current product offerings, augment our market coverage, enhance
our technical capabilities or otherwise offer growth opportunities. The issuance
of equity securities in connection with these acquisitions or investments could
significantly dilute our investors. If we incur or assume debt in connection
with these acquisitions or investments, we may incur interest charges that could
harm our net income. We have little experience in evaluating, completing,
managing or integrating acquisitions and strategic investments. Acquisitions and
strategic investments may entail numerous integration risks and impose costs on
us, including:

     - difficulties in assimilating acquired operations, technologies or
       products including the loss of key employees;

     - unanticipated costs;

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

     - adverse effects on business relationships with our suppliers and
       customers or those of the acquired businesses;

     - risks of entering markets in which we have no or limited prior
       experience;

     - assumption of contingent liabilities;

     - incurrence of significant amortization expenses related to goodwill and
       other intangible assets; and

                                       19
<PAGE>   23

     - incurrence of significant write-offs.

WE MAY NEED TO RAISE MORE CAPITAL, BUT THE AVAILABILITY OF ADDITIONAL FINANCING
IS UNCERTAIN.

     We intend to use the proceeds from this offering for general corporate
purposes, including working capital and capital expenditures, and we may use a
portion of the proceeds to acquire complementary businesses, products or
technologies and expand our sales and marketing efforts. We believe that these
proceeds, together with our existing capital resources, will be sufficient to
meet our capital requirements for at least the next 12 months. However, our
capital requirements depend on several factors, including:

     - the rate of market acceptance of our products;

     - our ability to expand our customer base;

     - the growth of our research and development and sales and marketing
       organizations; and

     - our ability to achieve profitability and positive cash flow.

     If our capital requirements vary significantly from those currently
planned, we may require additional financing sooner than anticipated. If
additional funds are raised through the issuance of equity securities, the
percentage equity ownership of our existing stockholders will be reduced. In
addition, holders of these equity securities may have rights, preferences or
privileges senior to those of the holders of our common stock. If additional
funds are raised through the issuance of debt securities, we may incur
significant interest charges, and these securities would have rights,
preferences and privileges senior to holders of common stock. The terms of these
securities could also impose restrictions on our operations. Additional
financing may not be available when needed on terms favorable to us or at all.
If adequate funds are not available or are not available on acceptable terms, we
may be unable to develop or enhance our products and services, take advantage of
future opportunities or respond to competitive pressures, which could negatively
impact our product development and sales.

SUBSTANTIAL FUTURE SALES OF OUR COMMON STOCK IN THE PUBLIC MARKET COULD CAUSE
OUR STOCK PRICE 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           shares of common stock outstanding. The           shares sold in
this offering will be freely transferable without restriction or additional
registration under the Securities Act of 1933. The remaining shares of common
stock outstanding after this offering will be available for sale, assuming the
effectiveness of lock-up agreements under which our stockholders have agreed not
to sell or otherwise dispose of their shares of common stock in the public
market, as follows:

<TABLE>
<CAPTION>
NUMBER OF SHARES                               DATE OF AVAILABILITY FOR SALE
- ----------------                               -----------------------------
<S>                                            <C>

</TABLE>

     (DATE OF PROSPECTUS)

     (180 DAYS AFTER PROSPECTUS)

     In addition, Lehman Brothers 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 the shares for sale, could
significantly reduce 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

                                       20
<PAGE>   24

common stock reserved for issuance under our stock incentive plans. On the date
180 days after the effective date of this offering, at least           shares
will be subject to immediately exercisable options, based on options outstanding
on March 31, 2000. Sales of a large number of these shares could decrease the
market price of our common stock.

     After this offering, the holders of           shares of common stock will
have rights with respect to registration of these shares for sale to the public.
If these holders, by exercising their registration rights, cause a large number
of securities to be registered and sold in the public market, the sales could
decrease the market price for our common stock. If we were to include in a
company-initiated registration shares held by these holders pursuant to the
exercise of their registration rights, these sales may hinder our ability to
raise needed capital.

MANY CORPORATE ACTIONS WILL BE SUBSTANTIALLY CONTROLLED BY OFFICERS, DIRECTORS
AND AFFILIATED ENTITIES REGARDLESS OF THE DESIRE OF OTHER INVESTORS TO PURSUE AN
ALTERNATIVE COURSE OF ACTION.

     After this offering, our directors, executive officers and their affiliated
entities will beneficially own approximately      % of our outstanding common
stock. These stockholders, if they acted together, could exert substantial
control over matters requiring approval by our stockholders, including electing
directors and approving mergers or other business combination transactions. This
concentration of ownership may also discourage, delay or prevent a change in
control of our company, which could deprive our stockholders of an opportunity
to receive a premium for their stock as part of a sale of our company and might
reduce our stock price. These actions may be taken even if they are opposed by
our other stockholders, including those who purchase shares in this offering.

PURCHASERS IN THIS OFFERING WILL IMMEDIATELY EXPERIENCE SUBSTANTIAL DILUTION IN
NET TANGIBLE BOOK VALUE.

     Because our common stock has in the past been sold at prices substantially
less than the initial public offering price that you will pay, you will suffer
immediate dilution of $     per share in pro forma net tangible book value,
based on an assumed initial offering price of $     per share of common stock.
The exercise of outstanding options may result in further dilution.

DELAWARE LAW AND OUR CORPORATE CHARTER AND BYLAWS CONTAIN ANTI-TAKEOVER
PROVISIONS THAT WOULD DELAY OR DISCOURAGE TAKE-OVER ATTEMPTS THAT STOCKHOLDERS
MAY CONSIDER FAVORABLE.

     Provisions in our certificate of incorporation, as amended and restated
upon the closing of this offering, may have the effect of delaying or preventing
a change of control or changes in our management. These provisions include:

     - the right of the board of directors to elect a director to fill a vacancy
       created by the expansion of the board of directors;

     - the ability of the board of directors to alter our bylaws without
       obtaining stockholder approval;

     - the establishment of a classified board of directors;

     - the ability of the board of directors to issue, without stockholder
       approval, up to five million shares of preferred stock with terms set by
       the board of directors which rights could be senior to those of common
       stock; and

     - the elimination of the right of stockholders to call a special meeting of
       stockholders and to take action by written consent.

     Each of these provisions could discourage potential take-over attempts and
could lower the market price of our common stock.

     In addition, because we are incorporated in Delaware, we are governed by
the provisions of Section 203 of the Delaware General Corporation Law. These
provisions may prohibit large stockholders, in particular those owning 15% or
more of our outstanding voting stock, from merging or combining with us. These
provisions in our charter, bylaws and under Delaware law could reduce the price
that investors

                                       21
<PAGE>   25

might be willing to pay for shares of our common stock in the future and result
in the market price being lower than it would be without these provisions.

WE MAY BE REQUIRED TO REPURCHASE OR BE LIABLE UNDER CALIFORNIA STATE SECURITIES
LAWS FOR SHARES ISSUED, AND OPTION GRANTS MADE, UNDER OUR 1996 STOCK OPTION
PLAN.

     The issuance of the shares and options under our 1996 stock option plan may
have violated California securities laws because these stock issuances and
option grants may not have been exempt from qualification under those securities
laws. We could be required to make total payments to the holders of these shares
and options of approximately $353,000 plus statutory interest of 7% per year, if
our offer to repurchase options and common stock issued upon exercise of options
is accepted. If any or all of these holders reject the repurchase offer, we may
continue to be liable under California securities laws for up to a total amount
of approximately $353,000 plus statutory interest of 7% per year.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     This prospectus contains forward-looking statements. The forward-looking
statements are contained principally in the sections entitled "Prospectus
Summary," "Risk Factors," "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and "Business." These statements involve
known and unknown risks, uncertainties and other factors which may cause our
actual results, performance or achievements to be materially different from any
future results, performances or achievements expressed or implied by the
forward-looking statements. Forward-looking statements include, but are not
limited to, statements about:

     - marketing and commercialization of our products under development;

     - our estimates regarding our capital requirements and our needs for
       additional financing;

     - plans for future products and services and for enhancements of existing
       products and services;

     - our patent applications and licensed technology regarding our products
       and technology;

     - our ability to attract customers and establish collaboration and
       licensing agreements; and

     - sources of revenues and anticipated revenues, including contributions
       from corporate collaborations, license agreements and other collaborative
       efforts, and the continued viability and duration of those agreements and
       efforts.

     In some cases, you can identify forward-looking statements by terms such as
"may," "intend," "might," "will," "should," "could," "would," "expect,"
"believe," "estimate," "predict," "potential," or the negative of these terms,
and similar expressions intended to identify forward-looking statements. These
statements reflect our current views with respect to future events and are based
on assumptions and subject to risks and uncertainties. Given these
uncertainties, you should not place undue reliance on these forward-looking
statements. We discuss many of these risks in this prospectus in greater detail
under the heading "Risk Factors." Also, these forward-looking statements
represent our estimates and assumptions only as of the date of this prospectus.

     This prospectus contains statistical data regarding the integrated access
device industry that we obtained from industry publications, including reports
generated by the Yankee Group, Ryan Hankin Kent, Gartner Group and Dataquest.
These industry publications generally indicate that they have obtained their
information from sources believed to be reliable, but do not guarantee the
accuracy and completeness of their information. We have not independently
verified their data.

     You should read this prospectus and the documents that we reference in this
prospectus and have filed as exhibits to the registration statement, of which
this prospectus is a part, completely and with the understanding that our actual
future results may be materially different from what we expect. We qualify all
of our forward-looking statements by these cautionary statements.

                                       22
<PAGE>   26

                                USE OF PROCEEDS

     We expect that the net proceeds we will receive from the sale of the shares
of common stock offered by us will be approximately $     , based on an assumed
initial public offering price of $     per share, and after deducting the
estimated underwriting discount and estimated offering expenses. If the
underwriters exercise their over-allotment option in full, our net proceeds will
be approximately $     . We currently intend to use the net proceeds of this
offering for general corporate purposes, including working capital and capital
expenditures and expansion of our domestic and international sales and marketing
efforts.

     In addition, we also may use a portion of the net proceeds of this offering
for the acquisition of complementary businesses, products or technologies. While
we evaluate these types of opportunities from time to time, there are currently
no agreements or negotiations with respect to any specific transaction.

     We have not yet determined all of our expected expenditures and we cannot
estimate the amounts to be used for each purpose set forth above. Accordingly,
our management will have significant flexibility in applying the net proceeds of
this offering. Pending use of the net proceeds as described above, we intend to
invest the net proceeds of this offering in short-term, interest-bearing,
investment-grade securities.

                                DIVIDEND POLICY

     We have never declared or paid any cash dividends on our capital stock, and
we do not currently intend to pay any cash dividends on our common stock in the
foreseeable future. We expect to retain future earnings, if any, to fund the
development and growth of our business. Our board of directors will determine
future dividends, if any.

                                       23
<PAGE>   27

                                 CAPITALIZATION

     The following table describes our capitalization as of March 31, 2000:

     - on an actual basis;

     - on a pro forma basis after giving effect to the automatic conversion of
       all of our outstanding shares of convertible preferred stock into
       17,694,657 shares of common stock upon completion of this offering; and

     - on a pro forma as adjusted basis to give effect to the sale of
                      shares of common stock in this offering at an assumed
       initial public offering price of $     per share, after deducting the
       estimated underwriting discount and estimated offering expenses.

     Please read this table together with the sections of this prospectus
entitled "Selected Financial Data" and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" and our consolidated financial
statements and the notes to those statements appearing elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                                                       MARCH 31, 2000
                                                            ------------------------------------
                                                                                      PRO FORMA
                                                             ACTUAL     PRO FORMA    AS ADJUSTED
                                                            --------    ---------    -----------
                                                             (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                         <C>         <C>          <C>
Long term debt --.........................................  $    404    $    404        $404
                                                            --------    --------        ----
Shareholders' equity:
  Convertible preferred stock, $.0001 par value,
     18,500,000 shares authorized; 17,694,657 shares
     issued and outstanding, actual; no shares issued and
     outstanding, pro forma and pro forma as adjusted.....    48,120
  Common stock, $.0001 par value, 35,000,000 shares
     authorized; 10,167,095 shares issued and outstanding,
     actual; 27,861,752 shares issued and outstanding, pro
     forma;      shares issued and outstanding, pro forma
     as adjusted..........................................    37,697      85,817
Deferred stock compensation...............................   (26,959)    (26,959)
Accumulated deficit.......................................   (38,017)    (38,017)
                                                            --------    --------        ----
  Total shareholders' equity..............................    20,841      20,841
                                                            --------    --------        ----
  Total capitalization....................................  $ 21,245    $ 21,245        $
                                                            ========    ========        ====
</TABLE>

     The table excludes:

     -           shares of common stock issuable upon the exercise of the
       underwriters' over-allotment option;

     - 8,481,471 shares of common stock issuable upon the exercise of stock
       options outstanding as of March 31, 2000, at a weighted average exercise
       price of $0.84 per share; and

     -           shares available for future issuance under our 1998 Stock Plan.

                                       24
<PAGE>   28

                                    DILUTION

     Our pro forma net tangible book value as of March 31, 2000 was
approximately $20,841,000, or $0.75 per share of common stock. Pro forma net
tangible book value per share represents the amount of our pro forma total
tangible assets less total liabilities, divided by the pro forma number of
shares of common stock outstanding assuming the conversion of all shares of
convertible preferred stock outstanding as of March 31, 2000 into 17,694,657
shares of common stock. After giving effect to the sale of the        shares of
common stock by us at an assumed initial public offering price of $     per
share, and after deducting the estimated underwriting discount and estimated
offering expenses, our pro forma net tangible book value as of March 31, 2000
would have been $       , or $     per share of common stock. This represents an
immediate increase in net tangible book value of $     per share of common stock
to existing stockholders and an immediate dilution in pro forma net tangible
book value of $     per share to new investors purchasing shares of common stock
in this offering.

     Pro forma net tangible book value dilution per share represents the
difference between the amount per share paid by purchasers of shares of common
stock in this offering and the pro forma net tangible book value per share of
common stock immediately after completion of this offering on an as adjusted
basis. The following table illustrates this per share dilution:

<TABLE>
<S>                                                           <C>         <C>
Assumed initial public offering price.......................              $
                                                                          --------
  Pro forma net tangible book value per share before
     offering...............................................  $
  Increase in pro forma net tangible book value per share
     attributable to this offering..........................
                                                              --------
Pro forma net tangible book value per share after this
  offering..................................................
                                                                          --------
Dilution per share to new investors.........................              $
                                                                          ========
</TABLE>

     The following table summarizes, on a pro forma basis as of March 31, 2000,
the number of shares of common stock purchased from us, the total consideration
paid and the average price per share paid by existing and new investors
purchasing shares of common stock in this offering, before deducting the
estimated underwriting discount and estimated offering expenses.

<TABLE>
<CAPTION>
                                                                          TOTAL
                                                 SHARES PURCHASED     CONSIDERATION
                                                 ----------------    ----------------    AVERAGE PRICE
                                                 NUMBER   PERCENT    AMOUNT   PERCENT      PER SHARE
                                                 ------   -------    ------   -------    -------------
<S>                                              <C>      <C>        <C>      <C>        <C>
Existing stockholders..........................                 %    $              %       $
New investors..................................
                                                 -----     -----     ------   ------
     Total.....................................            100.0%    $         100.0%
                                                 =====     =====     ======   ======
</TABLE>

     The table above assumes no exercise of any outstanding stock options. As of
March 31, 2000, there were 8,481,471 shares of common stock issuable upon
exercise of outstanding stock options at a weighted average exercise price of
$0.84 per share and           shares available for future issuance under our
1998 Stock Plan. To the extent that any of these options are exercised, there
will be further dilution to new investors.

                                       25
<PAGE>   29

                      SELECTED CONSOLIDATED FINANCIAL DATA

     The following selected consolidated financial data as of December 31, 1998
and 1999 and for each of the three years in the period ended December 31, 1999
are derived from the consolidated financial statements included elsewhere in
this prospectus, which have been audited by Deloitte & Touche LLP, independent
auditors. The consolidated financial data as of March 31, 2000 and for the three
months ended March 31, 1999 and 2000 are derived from unaudited consolidated
financial statements included elsewhere in this prospectus. The consolidated
financial data as of December 31, 1996 and 1997 and for the period from June 21,
1996 (inception) through December 31, 1996 are derived from audited consolidated
financial statements not included in this prospectus. We have prepared the
unaudited information on the same basis as the audited consolidated financial
statements and have included all adjustments, consisting of only normal
recurring adjustments, that we consider necessary for a fair presentation of our
financial position and operating results. When you read this selected
consolidated financial data, it is important that you also read the consolidated
financial statements and related notes included in this prospectus, as well as
the section of this prospectus entitled "Management's Discussion and Analysis of
Financial Condition and Results of Operations." Our historical results are not
necessarily indicative of our future results.

<TABLE>
<CAPTION>
                                        PERIOD FROM
                                       JUNE 21, 1996
                                        (INCEPTION)                                     THREE MONTHS
                                          THROUGH        YEARS ENDED DECEMBER 31,      ENDED MARCH 31,
                                       DECEMBER 31,    ----------------------------   -----------------
                                           1996         1997      1998       1999      1999      2000
                                       -------------   -------   -------   --------   -------   -------
                                               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE DATA)
<S>                                    <C>             <C>       <C>       <C>        <C>       <C>
CONSOLIDATED STATEMENTS OF OPERATIONS
  DATA:
Net revenue..........................      $ --        $   579   $ 4,393   $ 12,700   $ 2,903   $ 5,187
Cost of revenue......................                      542      2054      7,713     1,486     3,239
                                           ----        -------   -------   --------   -------   -------
Gross profit.........................        --             37     2,339      4,987     1,417     1,948
                                           ----        -------   -------   --------   -------   -------
Costs and expenses:
     Research and development........       499          1,906     4,174      6,690     1,280     2,505
     Selling, general and
       administrative................       342          2,532     6,414     10,881     2,077     3,721
     Amortization of deferred stock
       compensation*.................                       79       154      4,715       117     3,653
                                           ----        -------   -------   --------   -------   -------
       Total costs and expenses......       841          4,517    10,742     22,286     3,474     9,879
                                           ----        -------   -------   --------   -------   -------
Loss from operations.................      (841)        (4,480)   (8,403)   (17,299)   (2,057)   (7,931)
Interest income, net.................         9            165       413        223        91       126
                                           ----        -------   -------   --------   -------   -------
Net loss.............................      $(832)      $(4,315)  $(7,990)  $(17,076)  $(1,966)  $(7,805)
                                           ====        =======   =======   ========   =======   =======
Net loss per share, basic and
  diluted(1).........................       N/A        $ (4.83)  $ (2.63)  $  (3.30)  $ (0.46)  $ (1.12)
                                           ====        =======   =======   ========   =======   =======
Shares used in computation, basic and
  diluted(1).........................        --            894     3,038      5,169     4,270     6,958
                                           ====        =======   =======   ========   =======   =======
Pro forma net loss per share, basic
  and diluted(2).....................                                      $  (0.88)            $ (0.34)
                                                                           ========             =======
Shares used in pro forma computation,
  basic and diluted(2)...............                                        19,457              23,278
                                                                           ========             =======
</TABLE>

- ------------------------
* Amortization of deferred stock compensation

<TABLE>
<S>                                    <C>             <C>       <C>       <C>        <C>       <C>
Cost of revenue......................        --        $    --   $     2   $    152   $     8   $   154
Research and development.............        --             36        78      1,098        58     1,160
Selling, general and
  administrative.....................        --             43        74      3,465        51     2,339
                                           ----        -------   -------   --------   -------   -------
                                             --        $    79   $   154   $  4,715   $   117   $ 3,653
                                           ====        =======   =======   ========   =======   =======
</TABLE>

                                       26
<PAGE>   30

<TABLE>
<CAPTION>
                                                          DECEMBER 31,
                                              -------------------------------------    MARCH 31,
                                               1996      1997      1998       1999       2000
                                              ------    ------    -------    ------    ---------
                                                                (IN THOUSANDS)
<S>                                           <C>       <C>       <C>        <C>       <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term
  investments...............................  $5,049    $3,543    $11,359    $2,568     $21,557
Working capital (deficit)...................   4,842     2,896     11,058      (492)     19,443
Total assets................................   5,314     4,524     14,456     6,673      26,966
Long-term debt, less current portion........     129       400        655       534         404
Total shareholders' equity..................   4,917     3,233     11,549       348      20,841
</TABLE>

- ---------------
(1) The diluted net loss per share computation excludes potential shares of
    common stock issuable pursuant to convertible preferred stock and options to
    purchase common stock, as well as common stock subject to repurchase rights
    held by us, as their effect would be antidilutive. See Notes 1 and 6 of
    notes to consolidated financial statements for a detailed explanation of the
    determination of the shares used in computing basic and diluted net loss per
    share.

(2) Includes the weighted average number of shares resulting from the assumed
    conversion of all outstanding shares of convertible preferred stock upon the
    completion of this offering. See Note 1 of notes to consolidated financial
    statements for a detailed explanation of the determination of the shares
    used in computing pro forma net loss per share. The diluted pro forma net
    loss per share computation excludes potential shares of common stock
    issuable pursuant to options to purchase common stock, as well as common
    stock subject to repurchase rights held by us, as their effect would be
    antidilutive.

                                       27
<PAGE>   31

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

     The following discussion of our financial condition and results of
operations should be read together with the consolidated financial statements
and related notes that are included elsewhere in this prospectus. Our actual
results may differ materially from those anticipated in these forward-looking
statements as a result of various factors, including those set forth under "Risk
Factors" or in other parts of this prospectus.

OVERVIEW

     VINA Technologies is a leading developer of multiservice broadband access
communications equipment that enable communications service providers to deliver
bundled voice and data services. Our products integrate various broadband access
technologies, including circuit and packet-based networks, onto a single
platform to alleviate capacity constraints in the local loop, or first mile, of
communications networks.

     From our inception in June 1996 through February 1997, our operating
activities related primarily to developing and testing prototype products,
commencing the staffing of our sales and customer service organizations and
establishing relationships with our customers. We began shipments of our
Multiservice T1 Integrator product family in March 1997. In May 1999, we began
shipping our Multiservice Xchange product. Since inception, we have incurred
significant losses, and as of March 31, 2000, we had an accumulated deficit of
$38.0 million.

     We market and sell our products directly to communications service
providers and through OEM customers and value-added resellers, or VARs. Our
revenue is recognized when persuasive evidence of an arrangement exists,
delivery has occurred or services have been rendered, the price is fixed and
determinable, and collectibility is reasonably assured. This generally occurs
upon commercial shipment of our products at which time we have no further
performance obligations to our customers. We also record a provision at the time
we recognize revenue primarily for warranty costs. No revenue is recognized on
products shipped on a trial basis. We recognize extended warranty and other
service revenue ratably over the respective service periods. This service
revenue has not been significant to date.

     Our customer base is highly concentrated. A relatively small number of
customers have accounted for a significant portion of our historical net
revenue. For the year ended December 31, 1999, sales to Lucent Technologies
accounted for 46% of our net revenue. Five customers, including Lucent
Technologies, accounted for approximately 80% of our net revenue for the year
ended December 31, 1999. For the three months ended March 31, 2000, sales to our
five largest customers accounted for approximately 82% of our net revenue, of
which sales to Lucent Technologies, PairGain Technologies, Phillips
Communications and Equipment Company, 2nd Century Communications, and Gabriel
Communications accounted for 28%, 15%, 15%, 12% and 12% of our net revenue.
While the level of sales to any specific customer is anticipated to vary from
period to period, we expect that we will continue to experience significant
customer concentration for the foreseeable future. To date, international sales
have not been significant. International sales have been denominated solely in
U.S. dollars and, accordingly, we have not been exposed to significant
fluctuations in foreign currency exchange rates.

     Cost of revenue consists primarily of costs of products manufactured by a
third-party contract manufacturer, component costs, personnel related costs to
manage the contract manufacturer and warranty costs, and excludes amortization
of deferred stock compensation. We conduct program management, manufacturing
engineering, quality assurance and documentation control at our facility in
Fremont, California. We outsource our manufacturing and testing requirements to
Flextronics International Ltd. Accordingly, a significant portion of our cost of
revenue consists of payments to this contract manufacturer.

     We expect our gross margin to be affected by many factors, including
competitive pricing pressures, fluctuations in manufacturing volumes, costs of
components and sub-assemblies, costs from our contract manufacturers and the mix
of products or system configurations sold. Additionally, our gross margin may

                                       28
<PAGE>   32

fluctuate due to changes in our mix of distribution channels. Currently, we
derive the majority of our revenue from sales made to our OEM customers. A
significant increase in revenue to these OEM customers would adversely impact or
reduce our gross margin.

     Research and development expenses consist primarily of personnel and
related costs, consulting expenses and prototype costs related to the design,
development, testing and enhancement of our multiservice broadband access
products, and excludes amortization of deferred stock compensation. We expense
all of our research and development expenses as incurred.

     Selling, general and administrative expenses consist primarily of personnel
and related costs, including salaries and commissions for personnel engaged in
direct and indirect selling and marketing and other administrative functions and
promotional costs, including advertising, trade shows and related costs, and
excludes amortization of deferred stock compensation.

     For the years ended December 31, 1997, 1998 and 1999 and for the three
months ended March 31, 2000, we recorded an aggregate of $35.6 million in
deferred stock compensation. This amount represents the difference between the
deemed fair market value of our common stock at the time of option grants during
these periods and the exercise prices of these options. As there is no public
market for our common stock, the fair market value of our common stock on option
grant dates has been determined by our board of directors. The board of
directors in their determination of fair market value takes into consideration
many factors including, but not limited to, our financial performance, current
economic trends, actions by competitors, market maturity, emerging technologies,
near-term backlog and, in some circumstances, valuation analyses performed by
independent appraisers using generally accepted valuation methodologies such as
the income and market approaches. We are amortizing deferred stock compensation
using a multiple option award valuation approach over the vesting periods of the
applicable options, which is generally four years. See Note 6 of notes to
consolidated financial statements. The amortization of deferred stock
compensation for options granted through March 31, 2000 for the next four years
totals $13.4 million in the remaining nine months in 2000, $8.7 million in 2001,
$3.8 million in 2002 and $1.0 million in 2003.

     Interest income, net, consists primarily of interest earned on our cash,
cash equivalent and short-term investment balances partially offset by interest
expense associated with our debt obligations.

RESULTS OF OPERATIONS

     The following table sets forth selected consolidated statements of
operations data as a percentage of net revenue for the periods indicated. For
purposes of this table, cost of revenue, gross profit, research and development,
and selling, general and administrative amounts do not include amortization of
deferred stock compensation.

<TABLE>
<CAPTION>
                                                                            THREE MONTHS ENDED
                                               YEARS ENDED DECEMBER 31,         MARCH 31,
                                              --------------------------    ------------------
                                               1997      1998      1999     1999         2000
                                              ------    ------    ------    -----       ------
<S>                                           <C>       <C>       <C>       <C>         <C>
Net revenue.................................   100.0%    100.0%    100.0%   100.0%       100.0%
Cost of revenue.............................    93.6      46.8      60.7     51.2         62.4
                                              ------    ------    ------    -----       ------
Gross profit................................     6.4      53.2      39.3     48.8         37.6
                                              ------    ------    ------    -----       ------
Cost and expenses:
  Research and development..................   329.2      95.0      52.7     44.1         48.3
  Selling, general and administrative.......   437.3     146.0      85.7     71.5         71.7
  Amortization of deferred stock
     compensation...........................    13.6       3.5      37.1      4.0         70.5
                                              ------    ------    ------    -----       ------
     Total costs and expenses...............   780.1     244.5     175.5    119.6        190.5
                                              ------    ------    ------    -----       ------
Loss from operations........................  (773.7)   (191.3)   (136.2)   (70.8)      (152.9)
Interest income, net........................    28.4       9.4       1.8      3.1          2.4
                                              ------    ------    ------    -----       ------
Net loss....................................  (745.3)%  (181.9)%  (134.4)%  (67.7)%     (150.5)%
                                              ======    ======    ======    =====       ======
</TABLE>

                                       29
<PAGE>   33

  Three Months Ended March 31, 2000 and 1999

     Net revenue.  Net revenue increased to $5.2 million for the three months
ended March 31, 2000 from $2.9 million for the three months ended March 31,
1999. The growth in net revenue primarily resulted from sales of our
Multiservice Xchange products introduced in the second quarter of 1999 and
increased unit sales of our other products, offset by price reductions effected
in the second quarter of 1999.

     Cost of revenue.  Cost of revenue increased to $3.2 million for the three
months ended March 31, 2000 from $1.5 million for the three months ended March
31, 1999. Gross profit increased to $1.9 million for the three months ended
March 31, 2000 from $1.4 million for the three months ended March 31, 1999.
Gross margin decreased to 37.6% for the three months ended March 31, 2000 from
48.8% for the three months ended March 31, 1999. This decrease in gross margin
was due primarily to price reductions effected in the second quarter of 1999.

     Research and development expenses.  Research and development expenses
increased to $2.5 million for the three months ended March 31, 2000, from $1.3
million for the three months ended March 31, 1999. Research and development
expenses increased as a percentage of net revenue from 44.1% in the first
quarter of 1999 to 48.3% in the first quarter of 2000. These increases in
absolute dollar amounts and as a percentage of revenue were primarily a result
of additional personnel costs, prototype expenses and consulting costs. We
believe that continued investment in research and development is critical to
attaining our strategic product and cost reduction objectives, and as a result,
we expect these research and development expenses to increase in absolute
dollars in the future.

     Selling, general and administrative expenses.  Selling, general and
administrative expenses increased to $3.7 million for the three months ended
March 31, 2000 from $2.1 million for the three months ended March 31, 1999. This
increase was primarily attributable to increased personnel costs, including
hiring of additional sales and key management personnel, as well as increased
recruiting costs. Selling, general and administrative expenses as a percentage
of revenue remained flat for the first quarter of 2000 compared to the first
quarter of 1999. We intend to actively participate in marketing, business
development activities and selling and promotional programs, and therefore we
expect expenses related to these programs to continue to increase substantially
in absolute dollars in the future. In addition, we expect to substantially
expand our field sales operations and customer support organizations, which
would also result in an increase in selling and marketing expenses. We expect
selling, general and administrative expenses to continue to increase in absolute
dollars as we build our infrastructure to support our anticipated business
growth and operation as a public company.

     Amortization of deferred stock compensation.  Amortization of deferred
stock compensation increased to $3.7 million for the three months ended March
31, 2000 from $117,000 for the three months ended March 31, 1999. Based on stock
options granted through March 31, 2000, we expect to record $5.0 million of
amortization of stock-based compensation in the quarter ending June 30, 2000.

     Interest income, net.  Interest income, net for the three months ended
March 31, 2000 increased to $126,000 from $91,000 for the three months ended
March 31, 1999. This increase was primarily attributable to interest earned on
higher average cash balances throughout the relevant period.

  Fiscal Years Ended December 31, 1999, 1998 and 1997

     Net revenue.  Net revenue was $12.7 million for 1999, $4.4 million for 1998
and $579,000 for 1997. The increase in net revenue was primarily attributable to
increased unit sales of existing and new products, offset by price reductions
effected in the second quarter of 1999.

     Cost of revenue.  Cost of revenue was $7.7 million for 1999, $2.1 million
for 1998 and $542,000 for 1997. Gross profit increased to $5.0 million for 1999
from $2.3 million for 1998 and $37,000 for 1997. Gross margin decreased to 39.3%
for 1999 from 53.2% in 1998. This decrease was due primarily to price reductions
effected in the second quarter of 1999. Gross margin increased between 1997 and
1998 as a result of an increase in net revenue, which leveraged our
manufacturing personnel expenses and lowered the per unit cost.
                                       30
<PAGE>   34

     Research and development expenses.  Research and development expenses
increased to $6.7 million in 1999 from $4.2 million in 1998 and $1.9 million in
1997. These increases were primarily a result of additional personnel costs,
higher prototype expenses and higher consulting costs associated with our
continuing research and development efforts. Research and development expenses
decreased as a percentage of net revenue from 329.2% in 1997, to 95.0% in 1998
and 52.7% in 1999. These decreases were a result of net revenue increasing at a
rate faster than research and development expenses.

     Selling, general and administrative expenses.  Selling, general and
administrative expenses increased to $11.0 million in 1999 from $6.4 million in
1998 and $2.5 million in 1997. These increases were primarily attributable to
increased personnel costs, including hiring of additional sales and key
management personnel, as well as increased promotional expenses, including trade
shows and advertising. Selling, general and administrative expenses decreased as
a percentage of revenue from 437.3% in 1997, to 146.0% in 1998 and 85.7% in
1999. These decreases were a result of net revenue increasing at a rate faster
than selling, general and administrative expenses.

     Amortization of deferred stock compensation.  We recorded deferred stock
compensation of $17.9 million in 1999, $394,000 in 1998 and $200,000 in 1997.
Amortization of deferred stock compensation was $4.7 million in 1999, $154,000
in 1998 and $79,000 for 1997.

     Interest income, net.  Interest income, net decreased to $223,000 in 1999,
from $413,000 in 1998. This decrease was primarily attributable to lower cash
balances resulting in lower interest income earned. Interest income, net
increased to $413,000 in 1998 from $165,000 in 1997. This increase was primarily
attributable to increased interest income earned on higher cash balances
partially offset by interest expense on bank loans.

                                       31
<PAGE>   35

QUARTERLY RESULTS OF OPERATIONS

     The following tables set forth unaudited consolidated statements of
operations data for the past five quarters, including the quarter ended March
31, 2000. The unaudited consolidated information for each of these quarters has
been prepared on substantially the same basis as the audited consolidated
financial statements included elsewhere in this prospectus and, in our opinion,
includes all adjustments, consisting only of normal recurring adjustments,
necessary for a fair presentation of the results of operations for these
periods. For purposes of these tables, cost of revenue, gross profit, research
and development and selling, general and administrative amounts do not include
amortization of deferred stock compensation. Historical results are not
necessarily indicative of the results to be expected in the future, and results
of the interim periods are not necessarily indicative of our results of
operations for the entire year.

<TABLE>
<CAPTION>
                                                              THREE MONTHS ENDED
                                          -----------------------------------------------------------
                                          MARCH 31,    JUNE 30,    SEPT. 30,    DEC. 31,    MARCH 31,
                                            1999         1999        1999         1999        2000
                                          ---------    --------    ---------    --------    ---------
                                                                (IN THOUSANDS)
<S>                                       <C>          <C>         <C>          <C>         <C>
STATEMENTS OF OPERATIONS DATA:
Net revenue.............................   $ 2,903     $ 2,771      $ 2,992     $ 4,034      $ 5,187
Cost of revenue.........................     1,486       1,292        2,177       2,758        3,239
                                           -------     -------      -------     -------      -------
Gross profit............................     1,417       1,479          815       1,276        1,948
                                           -------     -------      -------     -------      -------
Cost and expenses:
  Research and development..............     1,280       1,478        1,531       2,401        2,505
  Selling, general and administrative...     2,077       2,443        2,832       3,529        3,721
  Amortization of deferred stock
     compensation.......................       117         453        1,547       2,598        3,653
                                           -------     -------      -------     -------      -------
     Total costs and expenses...........     3,474       4,374        5,910       8,528        9,879
                                           -------     -------      -------     -------      -------
Loss from operations....................    (2,057)     (2,895)      (5,095)     (7,252)      (7,931)
Interest income, net....................        91          77           50           5          126
                                           -------     -------      -------     -------      -------
Net loss................................   $(1,966)    $(2,818)     $(5,045)    $(7,247)     $(7,805)
                                           =======     =======      =======     =======      =======
AS A PERCENTAGE OF NET REVENUE:
Net revenue.............................     100.0%      100.0%       100.0%      100.0%       100.0%
Cost of revenue.........................      51.2        46.6         72.8        68.4         62.4
                                           -------     -------      -------     -------      -------
Gross profit............................      48.8        53.4         27.2        31.6         37.6
                                           -------     -------      -------     -------      -------
Costs and expenses:
  Research and development..............      44.1        53.3         51.2        59.5         48.3
  Selling, general and administrative...      71.5        88.2         94.6        87.5         71.7
  Amortization of deferred stock
     compensation.......................       4.0        16.4         51.7        64.4         70.5
                                           -------     -------      -------     -------      -------
     Total costs and expenses...........     119.6       157.9        197.5       211.4        190.5
                                           -------     -------      -------     -------      -------
Loss from operations....................     (70.8)     (104.5)      (170.3)     (179.8)      (152.9)
Interest income, net....................       3.1         2.8          1.7          .2          2.4
                                           -------     -------      -------     -------      -------
Net loss................................     (67.7)%    (101.7)%     (168.6)%    (179.6)%     (150.5)%
                                           =======     =======      =======     =======      =======
</TABLE>

     Net revenue has increased in each successive quarter since the quarter
ended June 30, 1999, as we have expanded our product line and increased OEM
sales of our products. Net revenue for the quarter ended June 30, 1999 decreased
$132,000 from the quarter ended March 31, 1999, primarily due to price
reductions on our TI Integrator product line in response to competitive
pressures during the quarter ended June 30, 1999, which was partially offset by
net revenue from the initial shipments of our Multiservice Xchange product line.

     Gross profit has increased in absolute dollars in each of the two most
recent quarters, as a result of cost reductions and increased net revenue
resulting in lower per unit costs. Gross margin in the quarter ended September
30, 1999 was significantly lower than in the quarter ended June 30, 1999,
primarily

                                       32
<PAGE>   36

because of price reductions on our T1 Integrator product line effected during
the quarter ended June 30, 1999.

     Costs and expenses have increased in absolute dollars in each successive
quarter referred to in the table above. These increases were primarily the
result of increased research and development expenses to introduce new products
and enhance existing products, increased selling and marketing costs associated
with higher revenue levels and increased general and administrative expenses
primarily associated with the hiring of key management and other personnel.

     Our quarterly and annual operating results will continue to fluctuate
significantly in the future due to a variety of factors, many of which are
outside our control. Additionally, as a result of our limited operating history
and the emerging nature of the multiservice broadband access device market in
which we compete, it is difficult for us to forecast our revenues or earnings
accurately. Our current and future expense levels are based largely on our
investment plans and estimates of future revenues and are, to a large extent,
fixed. We may be unable to adjust spending in a timely manner to compensate for
any unexpected revenue shortfall. Any significant shortfall in net revenue
relative to our planned expenditures would harm our operating results. Due to
these factors, our quarterly revenues and operating results are difficult to
forecast. We believe that period to period comparisons of our operating results
may not be meaningful and should not be relied upon as an indication of future
performance. In addition, it is possible that in one or more future quarters our
operating results will fall below the expectations of investors and securities
analysts, should analysts cover our stock in the future. In either event, the
trading price of our common stock would likely fall.

LIQUIDITY AND CAPITAL RESOURCES

     Since inception, we have satisfied our cash requirements primarily through
private sales of convertible preferred stock which generated gross proceeds of
approximately $48.8 million. At March 31, 2000, we had cash, cash equivalents
and short-term investments of $21.6 million, and $924,000 of outstanding
obligations under our equipment loan facility.

     Net cash used in operating activities was $9.1 million in 1999, $8.1
million in 1998 and $3.8 million in 1997. Net cash used in operating activities
for the three months ended March 31, 2000 was $5.0 million. Cash used in
operating activities resulted primarily from net losses from operations in each
period.

     Net cash provided by investing activities was $3.1 million in 1999. Net
cash used in investing activities was $4.7 million in 1998 and $645,000 in 1997.
The increase in cash provided by investing activities in 1999 was due to the
maturity of $8.0 million of short-term investments, partially offset by
purchases of $4.0 million of short-term investments and $938,000 of property and
equipment. The cash used in investing activities in 1998 and 1997 was primarily
due to the purchases of short-term securities and property and equipment. Net
cash used in investing activities was $13.2 million for the three months ended
March 31, 2000 and $2.2 million for the three months ended March 31, 1999, in
each case primarily reflecting purchases of short-term investments.

     Cash provided by financing activities was $1.2 million in 1999, $16.6
million in 1998 and $2.9 million in 1997. Cash provided by financing activities
in 1999 primarily consisted of proceeds from exercises of stock options and
sales of common stock. Cash provided by financing activities in 1998 and 1997
was primarily due to sales of convertible preferred stock. Cash provided by
financing activities for the three months ended March 31, 2000 was $24.5
million, primarily due to sales of convertible preferred stock. Cash provided by
financing activities for the three months ended March 31, 1999 was $281,000 due
primarily to proceeds from issuance of long-term debt.

     We currently have no significant commitments for capital expenditures. We
anticipate that we will increase our capital expenditures consistently with our
anticipated growth in personnel and infrastructure, including facilities and
systems.

                                       33
<PAGE>   37

     We expect to experience significant growth in our operating expenses for
the foreseeable future. As a result, we anticipate that operating expenses will
constitute a material use of our cash resources. In addition, we may use cash
resources, including net proceeds from this offering, to fund acquisitions or
investments in complementary businesses, technologies or products. We believe
that our cash on hand, available borrowings under our credit facilities and the
net proceeds from the sale of the common stock in this offering will be
sufficient to meet our working capital and capital expenditure requirements for
at least the next 12 months.

YEAR 2000 ISSUES

     The Year 2000 issue is the result of computer programs being written using
two digits rather than four to define the applicable year. Any computer programs
or hardware that have date-sensitive software or embedded chips may recognize a
date using "00" as the year 1900 rather than the year 2000. This could result in
system failures or miscalculations causing disruptions of operations for any
company using such computer programs or hardware, including, among other things,
a temporary inability to process research data, send invoices or engage in
normal business activities. We have not experienced any material Year 2000
related problems in connection with our internal systems or our products,
although we cannot assure you that such problems will not occur or become
apparent in the future. We plan to continue to monitor our internal systems and
products throughout the year to assess whether any problems develop. If any
errors or defects become evident, we may incur costs to resolve them.

NEW ACCOUNTING STANDARD

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards (SFAS) No. 133, "Accounting for Derivative
Instruments and Hedging Activities." This statement requires companies to record
derivatives on the balance sheet as assets or liabilities, measured at fair
value. Gains or losses resulting from changes in the values of those derivatives
would be accounted for depending on the use of the derivative and whether it
qualifies for hedge accounting. SFAS No. 133, as amended, will be effective for
us beginning in 2001. Although we have not fully assessed the implications of
SFAS No. 133, we do not believe adoption of this statement will have a material
impact on our consolidated financial position, results of operations or cash
flows.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS

     We are exposed to financial market risks related to interest rates and
foreign currency exchange rates. Our investments in commercial paper are subject
to interest rate risk, but due to the short-term nature of these investments,
interest rate changes would not have a material impact on their value at
December 31, 1998 and March 31, 2000. There were no such investments at December
31, 1999. We also had debt obligations of $1.0 million, $1.1 million and
$924,000 at December 31, 1998 and 1999 and March 31, 2000, respectively, which
bear interest based on prime plus a fixed percentage. We do not hedge any
interest rate exposures and a hypothetical change of 10% in the interest rates
would not have a material impact on the fair market value of these debt
obligations at December 31, 1998 and 1999 and March 31, 2000. To date, our
international sales have been denominated solely in U.S. dollars, and
accordingly, we have not been exposed to foreign currency exchange rate
fluctuations related to sales transactions. However, the functional currency of
our subsidiary in the United Kingdom is the U.S. dollar and as the local
accounts are maintained in British pounds, we are subject to foreign currency
exchange rate fluctuations associated with remeasurement to U.S. dollars. A
hypothetical change of 10% in the foreign currency exchange rates would not have
a material impact on our consolidated financial position or results of
operations.

                                       34
<PAGE>   38

                                    BUSINESS

     VINA Technologies is a leading developer of multiservice broadband access
communications equipment that enables communications service providers to
deliver bundled voice and data services. Our products integrate various
broadband access technologies, including both circuit- and packet-based
technologies, onto a single platform to alleviate capacity constraints in the
local loop, or first mile, of communications networks. We believe that by
integrating voice and data services onto a single broadband access platform, our
solutions decrease network access equipment costs and operating expenses for our
service provider customers. Our products also create additional revenue
opportunities for service providers by enabling them to deliver enhanced service
offerings. These services include local and long distance telephony, as well as
high-speed data services, such as Internet access, business-to-business
electronic commerce, extended local area networks, outsourced applications
services and messaging. By supporting both circuit- and packet-based
technologies, our products protect service providers' existing investments in
legacy networks and offer them a clear migration path to next generation,
converged voice and data networks. They also facilitate seamless and remote
upgrades and provisioning services by our customers.

INDUSTRY BACKGROUND

  Increasing Demand for Broadband Access

     The volume of Internet and other data traffic has grown quickly over the
past several years, due primarily to increased numbers of users and the
proliferation of bandwidth intensive applications such as business-to-business
electronic commerce, web hosting and remote access for telecommuters. According
to the Yankee Group, in 2000, over 50% of public communications network traffic
in the United States will be data traffic, surpassing the amount of voice
traffic on the public network for the first time. Moreover, Ryan Hankin Kent, a
market research and consulting firm, projects North American Internet traffic to
increase 45 times between 1999 and 2003. Electronic business applications have
become critical business tools and, as a result, businesses of all sizes
increasingly require their communication service provider to deliver constant
broadband connections at affordable rates.

  The First Mile Bottleneck

     Although service providers have deployed next generation technologies to
expand the speed and capacity of long distance networks, more limited investment
has been made in local networks, or the first mile, to address the substantial
increase in traffic. As a result, the first mile has become the communication
infrastructure's principal bottleneck, limiting the ability of service providers
to deliver broadband services to the market.

  Deregulation is Accelerating Competition and the Introduction of Broadband
Access

     Historically, in the United States, dominant telephone companies,
principally Regional Bell Operating Companies, were the exclusive operators of
facilities-based first mile communications networks. They offered circuit-based
digital network solutions, such as ISDN and T1, to address the demand for high-
bandwidth connectivity. The U.S. Telecommunications Act of 1996 opened the local
communications market to new entrants. The 1996 Act required the dominant local
carriers, known as incumbent local exchange carriers, or ILECs, to lease
portions of their networks to other carriers to compete in the first mile. These
new entrants are referred to as competitive local exchange carriers, or CLECs.
Expanded competition has accelerated the deployment of new technologies,
including digital subscriber line, or DSL, digital cable and broadband fixed
wireless, into the local market. To date, these broadband solutions have been
introduced as parallel data networks, co-existing along-side the voice
infrastructure controlled by ILECs, complicating the network.

     While both CLECs and ILECs have introduced services in the market to
address competition and the need for broadband access, each of them faces
significant challenges in their respective markets.

     CLECs.  CLECs have targeted the large business market in particular and
have gained market share from ILECs in recent years. Most CLECs have provided
either voice or data services and are facing

                                       35
<PAGE>   39

numerous challenges as they attempt to achieve profitability. CLECs are seeking
to decrease network expense by improving bandwidth management and reducing
customer turnover. They are also seeking to increase revenue per customer by
introducing bundled suites of enhanced voice and data services, such as long
distance, local call routing, Internet access, business-to-business electronic
commerce and web hosting. CLECs have also taken the lead in offering bundled
voice and data services to small to medium size businesses, a market which we
believe has been dominated, but underserved, by ILECs. These businesses often do
not have the financial or technical resources of large businesses to invest in
and manage costly parallel voice and data networks. We believe that small to
medium size businesses present an opportunity for CLECs to substantially grow
their customer base. According to the Yankee Group, in the U.S. there were
approximately 9.8 million small to medium size businesses with two to 499
employees in 1999.

     ILECs.  Historically, ILECs have faced strict regulations limiting their
investment returns in the voice market by tying those returns to their
infrastructure and other costs. ILECs now seek to introduce new enhanced data
services in deregulated markets where their returns are not so constrained.
Although ILECs have traditionally dominated the first mile market, they have
lost substantial market share to CLECs in the large business market and have
begun to lose market share in the small to medium size business market because
CLECs have been able to deliver more cost-effective services. In order to defend
their customer base in the small to medium size business market, ILECs are
seeking to provide bundled voice and data services to their customers. While the
Gartner Group and Dataquest report that approximately 95% of all North American
telecommunications revenue was voice related in 1998, they estimate that this
voice revenue will decrease to 75% of all telecommunications revenue by 2003. In
addition, ILECs are also experiencing a phone line, or copper pair shortage in
major metropolitan areas because there has been an increase in the number of
phone lines installed in customer premises for a variety of applications. Due to
this copper pair shortage, ILECs face pressure to more efficiently utilize their
copper infrastructure to meet the increasing demand for voice and high-speed
data access.

  Convergence of Voice and Data Networks

     Voice and data networks have evolved into parallel networks as broadband
access networks include both circuit-based networks utilizing time division
multiplexing, or TDM, and packet-based networks utilizing various protocols such
as asynchronous transfer mode, or ATM, Internet protocol, or IP, and frame
relay. The deployment of equipment dedicated to circuit-based networks and
packet-based networks has resulted in the creation of a highly complex
communications infrastructure comprised of multiple networks dedicated to
support various protocols. As a result, service providers are subject to high
network operating costs due to the redundancy of operating parallel networks and
limited equipment compatibility. In order for service providers to deliver
cost-effective, bundled voice and data services, we believe these parallel
networks as pictured in the diagram below need to be integrated and simplified.

[EDGAR DIAGRAM]

   [Edgar description of diagram: Diagram of parallel core networks entitled
"Today's Parallel Voice & Data Networks." The diagram depicts the path of voice
and data from the public communications network to the end user over the local
loop. At the top of the diagram are five clouds representing transport networks.
Below the clouds are several levels of boxes connected by arrows that describe
the data and voice paths.
   The first and top level consists of five clouds representing transport
networks. The three clouds on the left side of the page, and the levels below
them, make up three of the parallel networks. These three clouds, each
representing a transport standard, are labeled "ATM," "Frame Relay" and
"Internet." The two clouds on the right side of the page, and the levels below
them, make up two other parallel networks. These two clouds, each representing a
discrete network, are labeled "Local Voice Calling" and "Long Distance Voice
Calling." Connecting the top level with the levels below are arrows showing the
path of data and voice switches. Inside each of the five clouds is a box
entitled "Core Switches."
   The second level on the left side of the page, below and connected by arrows
with the three clouds above, is a row of boxes, each representing access
switches, labeled "ATM Concentrator," "Frame Relay Concentrator and "Router."
   The third level on the left side of the page, below and connected by arrows
the with boxes above, is a box labeled "CSU/DSU." -- Channel Service Unit/Data
Service Unit.
   The fourth level on the left side of the page, below and connected by three
arrows with the box above, is a box labeled "Firewall."
   The fifth level on the left side of the page, below and connected by arrows
the boxes above, is a circle labeled "Router/Hub."
   The sixth level on the left side of the page, below and connected by arrows
with the circle above, are boxes labeled "Video," "DHCP Server" and two personal
computers and a web server in boxes labeled "LAN."
   The second level on the right side of the page, below and connected by arrows
with the two clouds above, is a row of boxes, each representing core switches,
labeled "DLC" Digital Loop Concentrator and "DACS" -- Digital Cross-Connect
System.
   The third level on the right side of the page, below and connected by arrows
with the boxes above, is a box labeled "Channel Bank."
   The fourth level labeled Local Call Routing on the right side of the page,
below and connected by arrows with the boxes labeled "Channel Bank" and "DLC,"
is a box labeled "Key System or PBX."
   The fifth level labeled Local Call Routing on the right side of the page,
below and connected by arrows with the boxes labeled "Key System or PBX" and
"Channel Bank," are five boxes labeled "Phones."
   The third through sixth levels are all inside a box entitled "Local Call
Routing." The boxes at bottom of the page represent and are labeled "Customer
Premise."]

  Limitations Constraining the Deployment of Converged Next-Generation Network
Solutions

     While many service providers desire to provide bundled voice and data
services, they have been limited in their ability to deliver their services by
the following:

     - Multiple Equipment and Protocol Types.  Addressing multiple protocols has
       historically required service providers to tap multiple vendors and
       equipment types, and has resulted in confusion as well as unnecessary
       network complexity and expense. Service providers require multiservice
       access solutions that integrate readily into their existing networks,
       maintain compatibility with other components of their network and provide
       remote, dynamic bandwidth and service provisioning, eliminating the need
       for expensive manual provisioning and installation.

     - Inefficient use of network bandwidth.  The rapid increase in demand for
       bandwidth and the limited capacity available in the local loop have
       strained the level of services provided to end-users. Service

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<PAGE>   40

       providers require more efficient multiservice access solutions that
       minimize network expense, maximize bandwidth and are deliverable over a
       single copper line.

     - Uncertain migration path.  Service providers have invested billions of
       dollars in traditional circuit-based networks. They recognize that
       separate circuit-based voice networks and packet-based data networks must
       be converged because separate networks are not cost-effective in the long
       term. Service providers require multiservice access solutions that
       address both networks and offer a seamless migration path from legacy
       circuit-based networks to next-generation, packet-based networks.

     - Operational challenges to infrastructure deployment.  The scope and
       complexity of existing communication networks pose unique challenges to
       service providers in recruiting and training the necessary personnel to
       deploy, scale, provision and maintain the network. Simplified network
       solutions are needed to help reduce the number of personnel and technical
       expertise required.

     In order to address these challenges, several communications equipment
companies have introduced broadband integrated access devices, or IADs. First
generation IADs are circuit-based. As service providers plan their converged,
next-generation networks, they have become increasingly reluctant to invest in
communication equipment that cannot support packet-based traffic. In response,
several vendors have introduced packet-based IADs. However, we believe these new
devices have not been widely adopted because service providers have invested
billions of dollars in their circuit-based networks, which they are unwilling to
abandon. The transition to converged, next-generation networks is a costly and
complex process that will take many years to complete. Therefore, service
providers are seeking broadband access solutions that operate in both circuit-
and packet-based environments, enabling them to protect their investment in
legacy equipment while ensuring a seamless migration path to converged,
next-generation networks. This solution must be affordable, scalable and easy to
install and operate.

THE VINA SOLUTION

     We design, manufacture and market broadband access communications equipment
that offers, in one device, circuit- and packet-based services. Our products
enable service providers to offer a complete suite of bundled voice and data
services to end users, including voice, video, data and Internet services, such
as business-to-business electronic commerce and web hosting. Using our products,
service providers may remotely and dynamically customize the services they
deliver to individual customers. Furthermore, our products allow service
providers to cost-effectively deliver bundled offerings from a single vendor
with a single bill. Our products require little or no information technology
expertise on the end users' part and allow service providers to deliver products
for the first mile which reduce the cost and complexity associated with
purchasing, operating and maintaining their networks.

     We believe that our products offer service providers the following
benefits:

     - Reduced Network Complexity and Operating Cost.  Our platform-based
       solution integrates multiple products, such as routers, firewalls,
       channel banks, modems and features of private branch exchanges, or PBXs,
       which reduce the operating costs and the complexity of delivering bundled
       voice and data services. Service providers are able to operate more
       responsively and to roll out services on a cost-effective basis through
       our software-based remote bandwidth and service provisioning.

     - Increased Value Added Services.  Our solution allows service providers to
       enhance revenue derived from their installed customer base by selling
       additional software-enabled services, such as a firewall or local call
       routing. Our platform-based solution is designed to work with a broad
       range of first mile transport technologies.

     - Defined Network Migration Path.  Our products offer a smooth path from
       the legacy, circuit-based voice network environment to the next
       generation, packet-based voice and data network environment. We utilize
       software to migrate our products to next generation networks, minimizing
       or eliminating costly equipment upgrades. Our equipment is currently
       being installed in both circuit- and packet-based networks.
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<PAGE>   41

     - Ease of Deployment.  Our hardware products incorporate a software-based
       management system, including a graphical user interface to facilitate
       installation and use and to allow our service provider customers to
       remotely manage their product offerings and upgrades. Our product
       solution, combined with our extensive service program, simplifies and
       accelerates the deployment of bundled voice and data services.

     - Robust Service Platform.  Our products provide telecommunications grade
       quality and reliability. We offer robust solutions that have been
       designed to navigate the unpredictable course of local loop technology
       and standards development. We design our products to allow software-based
       upgrades for anticipated future network transport technologies.

VINA'S MULTISERVICE BROADBAND ACCESS SOLUTION

     The figure below illustrates how our solution accepts multiple transport
services into a single broadband access device. By incorporating various
functions, such as firewall, channel bank and features of a PBX, onto a single
platform, we enable our service provider customers to reduce their equipment
costs and network complexity, ease migration from circuit-based to packet-based
network, and enhance revenue opportunity from their installed customer base.

[EDGAR DESCRIPTION]

     [Edgar description of diagram 1. diagram of parallel core networks entitled
"VINA's Solution." The diagram depicts the path of voice and data from the
public communications network to the local loop. At the top of the diagram are
five clouds representing transport standards. Below the clouds are several
levels of boxes connected by arrows that describe the data and voice path.

     The first and top level consists of five clouds representing transport
standards. The three clouds on the left side are labeled "ATM," "Frame Relay"
and "Internet." The two clouds on the right side are labeled "Local Voice
Calling" and "Long Distance Voice Calling." Inside of each of five clouds is a
box entitled "Core Switches." Connecting the top level of clouds with the levels
of boxes are arrows showing the path of data and voice switches.

     The second level on the left side of the page below and connected by arrows
with the three clouds labeled "ATM," "Frame Relay" and "Internet," is a row of
boxes, each representing core switches, labeled "ATM Switch," "Frame Relay
Switch" and "Router Switch." The second level on the right side of the page,
below and connected by arrows with the two clouds labeled "Local Voice Calling"
and "Long Distance Voice Calling," is a row of boxes, each representing core
switches, labeled "DLC" and "DACS."

     The third level, below and connected by arrows with the boxes above, is a
box labeled "Multiservice Xchange." The arrow connecting this box with the boxes
above is labeled "TDM/ATM/FR/IP."

     The fourth level, below and connected by arrows with the box above, are the
following: (i) a box labeled "Video," (ii) three boxes labeled "LAN," (iii) a
box labeled "Key Systems or PBX," below which are three boxes labeled "Phones"
and (iv) two boxes labeled "Phones."

     The third and fourth levels are each inside a box entitled "Converged
Access Edge." The boxes at bottom of the page represent and are labeled
"Customer Premise."]

THE VINA STRATEGY

     Our objective is to be the leading provider of complete, integrated
solutions for the first mile of communications networks. Key elements of our
strategy include:

     - Enhancing Strategic Value to our Service Provider Customers.  We plan to
       continue to provide innovative multiservice broadband access solutions
       that allow our service provider customers to differentiate their service
       offerings from those of their competitors and to efficiently leverage
       their capital resources. We have instituted our QuickStart service and
       implementation program to help our service provider customers' marketing
       efforts for their bundled voice and data service offerings. We use our
       customer steering committee, comprised of engineering and marketing
       executives from some of our service provider customers, to identify and
       address customer needs and industry trends.

     - Expanding Product and Service Set to Further Simplify the First Mile.  We
       have an established track record of leadership in developing next
       generation broadband access solutions based on our technological
       developments in voice and data delivery systems. We intend to leverage
       our extensive
                                       38
<PAGE>   42

       voice and data development expertise to expand our product offerings and
       to introduce an end-to-end broadband solution for the first mile.

     - Leveraging Competitive Trends to Accelerate Deployment of Broadband
       Access.  The market for telecommunications services has been dominated by
       ILECs' legacy voice services. We plan to further facilitate competition
       in this market by enabling CLECs to offer differentiated, bundled voice
       and data services. We believe ILECs will respond to increased competition
       by also deploying multiservice broadband access devices. We also believe
       that deregulation in global markets will foster competition and promote
       the adoption of our products.

     - Developing and Strengthening Strategic Relationships.  We intend to
       continue to strengthen our relationships with a small number of
       established companies who offer our equipment on an OEM basis to further
       expand our service provider customer base. We supply products to Lucent
       Technologies and PairGain Technologies through OEM agreements. In
       addition, we maintain co-marketing relationships with complementary
       communications equipment vendors, including CopperCom, Copper Mountain
       Networks, Jetstream Communications, Tachion Networks, and Tollbridge
       Technologies. We intend to increase the number of these co-marketing
       relationships to ensure that our products are compatible with newly
       developed broadband access technologies.

     - Maintaining and Extending Compatibility with Leading Vendors.  We have
       designed our products to be compatible with leading telecommunications
       equipment vendors such as Lucent Technologies, PairGain Technologies,
       Alcatel S.A., Cisco Systems, LM Ericsson and Nortel Networks Corporation.
       We plan to extend our relationships with leading technology companies to
       jointly develop solutions that further integrate and simplify
       communications networks.

     - Broadening Distribution Channels.  We intend to continue to deepen and
       expand our direct sales force, as well as our indirect distribution
       network. We have developed an indirect network of distribution partners,
       including OEM customers and VARs. We intend to extend our global presence
       by expanding our existing sales force and establishing OEM and VAR
       relationships in Europe and the Pacific Rim.

OUR PRODUCTS

     We offer a family of products for the first mile designed to allow service
providers to deliver a complete suite of bundled voice and data services
cost-effectively over a reduced number of network connections.

  Multiservice T1 Integrator and HDSL Integrator

     Our Multiservice T1 Integrator and HDSL Integrator are hardware platform
solutions that allow service providers to integrate their customers' voice,
data, video and Internet requirements onto a single T1 line or high-bit rate
digital subscriber line, or HDSL. These multiservice broadband access devices
provide toll-quality voice service in both circuit- and packet-based networks.
In addition, they support software-based value-added features including
intelligent local call routing, firewalls, service level agreement statistics
and Business OfficeXchange, which enables our products to operate as stand-alone
PBX systems. Consequently, our multiservice broadband access devices not only
lower deployment costs and streamline provisioning, but also enable our service
providers to differentiate themselves in the market and address end users'
service requirements.

     Our T1 Integrator's channel bank function converts a T1 digital line into
24 individual analog telephone circuits. In addition, its integrated
multiplexing and routing functionality allows the allocation of channels for
video and personal computers, or PCs, as well as high-speed, dedicated Internet
and frame relay access. The T1 Integrator also supports standard channel bank
functionality and local call routing, which enables 911, 411 and local toll-free
calls to be switched to the ILEC and provides redundancy in the event of an
interruption in T1 service.

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<PAGE>   43

  Multiservice Xchange

     Our Multiservice Xchange, or MX, is a compact, next-generation multiservice
broadband access device that delivers circuit- and packet-based voice, data,
video and Internet access services over a maximum of two T1 or, its
international equivalent, E1 lines. The MX provides support for the legacy
circuit-based TDM network to deliver voice and data access services. It also
supports next generation, packet-based ATM voice and data services. Accordingly,
it meets the needs of both service providers who have implemented next
generation packet-based ATM networks, as well as providers who intend to migrate
from existing circuit-based to ATM-based networks. The MX provides toll-quality
voice service in both circuit- and packet-based networks. For packet-based voice
and data applications, the MX provides dynamic bandwidth allocation as well as
quality of service, or QoS, management, enabling service providers to further
maximize bandwidth in the first mile. Consequently, the MX enables our service
provider customers to realize savings in deployment, facility and maintenance
costs, streamline provisioning and expand the range of services our customers
are able to offer to end-users. The MX also supports telecommunication protocols
used in major international markets.

  DSL eLink

     To address the rapidly growing DSL access market, we recently introduced a
compact family of Voice over DSL, or VoDSL, multiservice broadband access
devices designed and supplied to us by Polycom. Known as the DSL eLink family of
products, these compact, cost-effective devices provide packet-based ATM and
frame-based voice, video, data and Internet services over a single unbundled
copper-pair symmetric network connection serving the 8- and 16-voice line
market. Using the DSL eLink, service providers can take advantage of DSL
technology to provide high speed services over the existing copper local loop
and reduce facility costs as compared to an equivalent T1 based service.
Additionally, VoDSL technology enables service providers to deliver voice and
data services over copper lines previously dedicated to data and Internet
services. The DSL eLink products are single device solutions serving all the
voice and data service needs of small to medium size businesses.

     The DSL eLink products are compatible with several of the major DSL access
multiplexes, or DSLAMs, including those from AccessLan Communications, Copper
Mountain Networks, Lucent Technologies, Nokia Corp., Nortel Networks and
packet-based voice gateways offered by CopperCom, Jetstream Communications and
Tollbridge Technologies.

                             VINA PRODUCTS SUMMARY

<TABLE>
<CAPTION>
   PRODUCT            FEATURE/FUNCTIONALITY                     BENEFIT HIGHLIGHTS                  PRICE RANGE
<S>            <C>                                  <C>                                          <C>
 T1            - Voice, video, data and Internet    - Offers a comprehensive suite of broadband  $1,700 to $4,400
 Integrator    over a single T1 line                  access needs for a business in an
               - Support for 4 to 24 analog           integrated device over a single T1 line
               telephone lines                      - Enables cost-effective voice, data and
               - Ethernet local area network, or      Internet access services
                 LAN, port                          - Extends customers' LAN to the wide area
               - A digital telephone switch port    network
               - A router                           - Connects to external PBX
               - Self-contained IP address          - Secures IP address management
               management                           - Connects to external router or data
               - A firewall                         device
               - A multipurpose high-speed serial
                 port, e.g., video port
               - Software-based enhanced features,
                 including intelligent local call
                 routing, service level agreement
                 statistics and Business
                 OfficeXchange (Centrex
                 functionality)
</TABLE>

                                       40
<PAGE>   44

<TABLE>
<CAPTION>
   PRODUCT            FEATURE/FUNCTIONALITY                     BENEFIT HIGHLIGHTS                  PRICE RANGE
<S>            <C>                                  <C>                                          <C>
 HDSL          All of the functions of the T1       All benefits of the T1 Integrator plus:      $2,300 to $5,000
 Integrator    Integrator plus support for HDSL     - Leverages unbundled copper local loop
               network connection                     through HDSL for high speed, lower cost
                                                      access
 Multiservice  All of the functions of the T1       All benefits of the T1 Integrator plus:      $3,500 to $17,000
 Xchange (MX)  Integrator plus:                     - Offers a comprehensive suite of broadband
               - Up to 3 ports (T1, E1 or DSL)      access needs for a business in an
               - Support for 4 to 48 analog           integrated device over up to 3 ports (T1,
               telephone lines                        E1 or DSL)
               - TDM or ATM voice and data          - Deploys and permits migration from
                 multiplexer                          circuit-based networks to packet-based
               - Supports ATM quality of service      networks
               for voice and data                   - Enables higher bandwidth efficiencies at
               - ATM dynamic bandwidth allocation   lower network costs through packet-based
                                                    capabilities
 DSL eLink     - Support for 8 or 16 analog voice   - Provides cost-effective voice, data and    $1,600 to $4,000
                 ports                                Internet access services using SDSL
               - Ethernet port with integral        - Extends customers' LAN to the wide area
               routing                                network
               - Dynamic host control protocol, or  - Enables higher bandwith efficiencies at
                 DHCP, server and firewall            lower network costs through packet-based
               - Symmetric DSL, or SDSL, network      capabilities
                 connection
               - Voice compression over ATM
</TABLE>

SALES AND MARKETING

  Sales

     We sell our products to service providers directly through our sales force,
and indirectly through our OEM customers and VARs. We have established a small
number of OEM customers and other marketing relationships in order to serve
particular markets and provide our service provider customers with opportunities
to purchase our products in conjunction with complementary products and
services.

     - Direct.  Direct sales have represented, and we believe will continue to
       represent, the majority of our sales. We believe that direct interaction
       with service providers offers us the best understanding of the business
       models and technical requirements of our customers. Further, we believe
       that the competitive nature of the telecommunications equipment industry
       requires us to reduce costs that by eliminating intermediate steps in the
       distribution chain.

     - OEM.  OEM sales through Lucent and PairGain are important distribution
       channels for us in the U.S. In particular, we believe Lucent's
       relationships with CLECs, ILECs and small independent operating companies
       will continue to enhance our ability to reach this large customer base.
       OEM customers use our products to deliver complete, end-to-end solutions
       that are installed and field-serviced by their technical support
       organizations. We plan to initiate and develop relationships with
       additional leaders in the communications equipment industries as
       potential OEM customers.

     - Value Added Resellers.  In addition to direct sales and OEM customers, we
       have existing relationships with VARs focused on the service provider
       market. We intend to leverage our existing VAR relationships to seek new
       opportunities for the deployment of our products. In addition to the VARs
       we work with in the United States, we are developing relationships with
       VARs in Europe and the Pacific Rim.

     Whether we ship our products directly or through one of our OEM customers
or VARs, maintaining a direct relationship with each of our service provider
customers is an important part of our sales strategy. Since establishing a
strong working relationship with our customers is critical to sales success and
future product development, we strive to maintain strong visibility across our
service provider customer base,

                                       41
<PAGE>   45

regardless of the distribution channel. As of April 30, 2000, our sales
organization consisted of 34 employees.

  Marketing

     Our marketing objectives include building market awareness and acceptance
of our company and our products, as well as generating qualified customer leads.
To accomplish this, our marketing activities include public relations,
communications, research, sales support, direct marketing, a web presence,
product marketing, as well as channel marketing. We work directly with service
providers to help them develop business models, introduce product packages,
promotional programs and pricing strategies, all designed to promote the
delivery of multiple voice and data services over a single broadband access
facility. In addition, we actively work with a number of industry and trade
publications and industry analysts to educate service providers on how to
deploy, and the benefits of, multiservice broadband access networks.

     We have developed an extensive co-marketing initiative targeting our
customers. Our QuickStart implementation program educates our customers on our
products and services through comprehensive training and sales programs, joint
marketing and lead generation activities, joint sales initiatives, and
communication and technical support. Currently, we maintain QuickStart marketing
relationships with eight customers, including Allegiance Telecom Inc., Birch
Telecom Inc., Broadwing Inc., Caprock Communications Corp., Intermedia
Communications Inc., Pacific Bell, 2nd Century Communications, Inc. and Time
Warner Telecom Inc. The tools and resources available through our QuickStart
program enable our customers to quickly understand our product solutions, expand
their customer base and create new revenue opportunities for their installed
base. As of April 30, 2000, our marketing organization consisted of nine
employees.

CUSTOMER SERVICE AND SUPPORT

     Our customer service organization maintains and supports products sold to
service providers and offers technical support to our OEM customers and VARs. We
also assist our OEM customers and VARs in offering installation, maintenance and
support services to their customers for our products. We handle questions and
problems over the Internet, telephone and e-mail. We continually update our
website to enable our direct and indirect customers to download the latest
technical information and tips, along with firmware, software and product
manuals.

CUSTOMERS

     We primarily sell to CLECs, ILECs and smaller independent operating
companies through direct sales and indirectly through our OEM customers and
VARs. The following is a list of some of our direct and indirect service
provider customers:

- - 2nd Century Communications
- - Allegiance Telecom
- - ATG Technologies
- - Birch Telecom
- - Broadwing
- - CapRock Communications
- - Gabriel Communications
- - GST Telecommunications
- - ICG Communications
- - Intermedia Communications
- - KMC Telecom
- - MCI Worldcom
- - MediaOne Group
- - North American Telephone
- - Pacific Bell
- - TelePacific Communications
- - Time Warner Telecom

     For the year ended December 31, 1999, sales to Lucent accounted for 46% of
our net revenue. Five customers, including Lucent Technologies, accounted for
approximately 80% of our net revenue for the year ended December 31, 1999. For
the three months ended March 31, 2000, sales to our five largest customers
accounted for approximately 82% of our net revenue, of which sales to Lucent,
PairGain, Phillips Communications and Equipment, 2nd Century Communications and
Gabriel Communications accounted for 28%, 15%, 15%, 12% and 12% of our net
revenue.

                                       42
<PAGE>   46

STRATEGIC RELATIONSHIPS

     A key element of our plan is to expand our sales, marketing and
distribution channels through strategic relationships. We have established, and
will continue to pursue, these strategic relationships in order to grow
revenues, and to provide indirect sales and marketing of our solutions.

     Lucent Technologies.  In May 1998, we entered into an OEM agreement with
Lucent which we restated in May 1999. The Lucent agreement expires in May 2002
and can be renewed for a one year period. The agreement may be terminated by
Lucent at any time upon 60 days' notice. Our working relationship with Lucent
offers each of us a number of strategic advantages. Lucent uses our products to
offer a complete end-to-end solution for the first mile integrating voice and
data traffic. In turn, we have the opportunity to leverage Lucent's extensive
sales force and marketing relationships to reach new customers and markets.

     Lucent incorporates our T1 Integrator and MX into its ConnectReach product
family. ConnectReach consists of our Multiservice T1 Integrator and a seamless
connection to Lucent's SLC-2000 Access System, a digital loop carrier, enabling
the two products to function as a single, integrated voice and data access
system in the local loop. ConnectReach also interconnects with the AnyMedia
Access System, a next generation digital loop carrier. Lucent's ConnectReach
Plus consists of our MX with a seamless connection with either Lucent's SLC-2000
Access System or AnyMedia access system. Designed to offer cost-effective
enhanced bundled services to branch offices and small and medium sized
businesses, the ConnectReach Plus seamlessly integrates voice, data, video, and
Internet access over a common T1, E1 or DSL network connection. The ConnectReach
Plus can be deployed today in a TDM network to provide support for traditional
services such as TDM voice, data, and Internet access. The same ConnectReach
Plus chassis can be configured for voice over ATM, providing a smooth migration
path for service providers.

     PairGain.  In February 1998, we entered into a technology and distribution
agreement with PairGain to offer an integrated, cost-effective HDSL-based voice,
data, and Internet access solution. In February 1999, the agreement was renewed
for an additional year. The agreement is renewable for four more consecutive
12-month periods. PairGain provides us with modules for our DSL technology which
we incorporate into the products we design and produce for PairGain and into
products we sell under our label. Similar to our relationship with Lucent, we
plan to leverage PairGain's sales force and marketing relationship to reach new
customers and markets. PairGain sells our T1 Integrator to their customer base
as the PairGain T1 Integrator product. We incorporate PairGain's HDSL technology
into our T1 product family under the HDSL Integrator product. Our relationship
with PairGain addresses the increasing demand for simple, cost-effective
solutions. Our integrated HDSL solution enables PairGain and other service
providers to combine voice and data communications while significantly reducing
the cost of T1 deployment.

  Interoperability Relationships

     Maintaining product compatibility with a broad range of equipment vendors
and central office gateway protocols is critical to our success as a supplier of
first mile solutions. These relationships allow us to work with other vendors to
develop solutions that continue to simplify the network and enhance our market
position with service providers. We have entered into interoperability
agreements with four vendors in the voice over DSL market -- CopperCom,
Jetstream and Tollbridge. We also have relationships with developers of next
generation SS7 gateways to accelerate the deployment of next-generation
ATM-based local exchange carrier services, including relationships with
Convergent Networks, Tachion and TeraBridge. These relationships help minimize
the technology risk to our service provider customers.

TECHNOLOGY

     Our products and technology enable multiservice access over a single
broadband network with an open architecture. The open nature of our products
allows our solution to be seamlessly integrated into the traditional TDM
circuit-based infrastructure to deliver enhanced bundled services while offering
the ability
                                       43
<PAGE>   47

to migrate the network through hardware or software upgrades, to an ATM
packet-based network, and subsequently to an IP network. We have developed
extensive core competencies.

  Asynchronous Transfer Mode and Frame Relay Expertise

     We have developed expertise in packetized voice and data technology. The
two widely deployed and proven packet-based technologies that can be utilized to
integrate voice and data over a single line are ATM and frame relay. Our
expertise with packet-based technology stems from developing advanced system
functions such as digital signal processing, echo cancellation, dynamic call
setup and virtual circuit switching, as well as class of service management
capabilities.

  Digital Subscriber Line Expertise

     DSL has emerged as the most attractive first mile access technology for
providing high bandwidth data access over existing copper telephone lines. In
addition to high-speed access, DSL technology lowers access costs, compared to
equivalent T1 lines. Several versions of DSL are being implemented for differing
applications, including SDSL, high-bit rate digital subscriber line, or HDSL,
and HDSL2 for business applications. We have designed our products to scale
quickly and easily add new transmission technologies. Unlike other DSL
technologies, HDSL2 has been standardized to ensure open compatibility. HDSL2
technology provides T1 equivalent performance for both packet and channelized
services. We have implemented HDSL in our T1 Integrator product line and SDSL in
our DSL eLink product line. We plan to introduce products incorporating HDSL2.

  Internet and Internet Protocol Expertise

     Demand for Internet services has grown exponentially. These services
require an all IP infrastructure, especially in the access network for Web
applications and use, e-commerce and email. Our products incorporate an IP
router which offers firewall options that include circuit level security
technology and packet filtering, as well network address translation, or NAT,
and a software-based dynamic host control protocol, or DHCP, to provide dynamic
IP address management. These IP elements are necessary to ensure reliable and
secure Internet access. Our products offer our customers a fully integrated
Internet access solution.

  Time Division Multiplexing Expertise

     Most carrier networks use high bit rate digital systems employing
time-division multiplexing, or TDM. With extensive deployment of T1, digital
local offices and optical transmission, TDM became economically viable in the
1980s and 1990s. The existing public switched telephone network is predominantly
based on digital time division switching, transmission and signaling over the
out-of-band control network. Our family of products has been designed to allow
seamless integration into TDM circuit-based networks and to offer a migration
path to new packet-based technologies such as ATM.

  Hardware Design

     Our customers favor telecommunications grade hardware designs. Thus we have
avoided hardware design technology commonly used in the PC industry. Instead our
designs incorporate microprocessors specifically developed for communications
applications and for high reliability and high availability environments. We
utilize design techniques which result in over-design of our digital circuitry,
analog circuitry, cooling and power systems. We incorporate field programmable
gate array logic components where possible to simplify designs and improve
reliability. Our interface designs incorporate popular standard chipsets in
order to assure compatibility with other carrier equipment. Our hardware designs
include many maintenance features which reduce operating costs for our
customers. For example, our service provider customers can use our equipment to
test their analog lines while the line is not inoperable. We perform extensive
environmental testing on all of our products and most of our products are
designed for and meet network equipment building systems, or NEBs, requirements
adopted by most carriers. Our

                                       44
<PAGE>   48

products are also designed to meet the European telecommunications and physical
standards. We believe that all our designs meet applicable underwriters labs and
Federal Communications Commission standards.

RESEARCH AND DEVELOPMENT

     We believe that our success is, to a large extent, dependent upon our
responsiveness to the continued technological migration of our customers'
networks. Our research and development group works closely with our OEM
customers and our customer steering committee, and our marketing department for
product definition and to assure compatability with central office equipment.

     Research and development expenses, including all product development,
system testing and documentation, were approximately $1.9 million in 1997, $4.2
million in 1998, $6.7 million in 1999 and $2.5 million for the three months
ended March 31, 2000. All of our product development costs have been expensed as
incurred. We have licensed certain commercially available software from third
parties, some of which have associated royalties. We conduct the majority of our
research and development at our Fremont California headquarters and are in the
process of establishing additional centers through the United States and
internationally. As of April 30, 2000, we had 55 employees dedicated to research
and development.

     While we develop some custom products for our OEM customers, most of our
research and development efforts are focused on standard products. We have
significant hardware and software expertise in both TDM circuit-based and ATM
packet-based network technologies. We place heavy emphasis on our design
verification processes which include extensive testing at our Fremont facilities
and significant interoperability testing at partner sites.

MANUFACTURING

     We have outsourced our manufacturing operations to Flextronics
International, a contract manufacturer located in San Jose, California. We
believe outsourcing our manufacturing enables us to benefit from the component
purchasing capabilities of a global contract manufacturer that can accommodate
significant increases in production volume and product mix, as necessary. We use
a rolling 12-month forecast based on anticipated product orders to determine our
product requirements. We, in turn, provide these forecasts to Flextronics, who
purchases the components for our products and assembles them to our
specifications. We intend to utilize Flextronics' resources and expertise to
assist us in manufacturing, engineering, repair and product testing.

     Our manufacturer performs board assembly, systems configuration and testing
and product shipping. We have developed comprehensive inspection tests and use
statistical process controls to assure the reliability and quality of our
products. Our manufacturing engineers develop all test procedures and design and
build all equipment and stations required to test our products. We integrate
these manufacturing tests with our contract manufacturer's build processes. Our
manufacturing personnel work closely with our design engineers to design for
manufacturability, and to ensure that our test methods remain current as
broadband access technologies evolve.

     We obtain several of the key components used in our products from single or
limited sources of supply. We have encountered, and expect in the future to
encounter, difficulty in obtaining these components from our suppliers. As
recently as the fourth quarter of 1999, we experienced a severe shortage of
components, particularly subscriber line interface circuits, which jeopardized
our ability to deliver our products in a timely fashion. The suppliers of our
components range from small vendors to large established companies. Components
for which we currently have only a single source include subscriber line
interface circuits that we purchase from Advanced Micro Devices, and
microprocessors that we purchase from Motorola Corporation. Components for which
we currently have limited sources include digital signal processors, DSL modules
and flash memory. We purchase most components on a purchase order basis and do
not have guaranteed supply arrangements with most of our key suppliers. We or
our contract manufacturer may not be able to obtain necessary supplies in a
timely manner.

                                       45
<PAGE>   49

     We select manufacturers and suppliers on the basis of technology,
manufacturing capacity, materials management, quality and cost. We may, in the
future, seek additional manufacturers and suppliers to meet our anticipated
requirements and lower the cost of our products. We are in the process of
obtaining International Standards Organization, or ISO, 9001 certification.
Flextronics is ISO 9002 certified.

COMPETITION

     The market for multiservice broadband access products is extremely
competitive. We believe that competition will increase substantially as the
introduction of new technologies, deployment of broadband access networks, and
potential regulatory changes create new opportunities for established and
emerging companies. Furthermore, DSL- and T1-based solutions compete with
broadband wireless and cable offers. We face competition primarily in two areas:
equipment manufacturers, such as Accelerated Networks, ADTRAN, Carrier Access
Corporation, Efficient Networks, Sonoma Systems and diversified equipment
manufacturers such as Cisco Systems, Lucent and Nortel Networks. In addition, we
may in the future compete with SS7 gateway suppliers as well as VoDSL suppliers.

     The principal competitive factors for products utilized in our markets
include:

     - pricing;

     - product features;

     - reliability and scalability;

     - performance;

     - compatibility with other products;

     - ease of installation and use;

     - customer relationships, service and support; and

     - brand recognition.

     Some of our competitors have greater financial and other resources than do
we. With greater resources, our competitors may be able to take better advantage
of new competitive opportunities, including offering lease and other financing
programs. In addition, the rapid technological developments in our industry can
result in frequent changes to our group of competitors. Consolidation in our
industry may also affect our ability to compete. Acquisitions may strengthen our
competitors' financial, technical and marketing resources and provide greater
access to customers or new technologies. As a result, these competitors may be
able to devote greater resources than we can to the development, promotion, sale
and support of their products.

INTELLECTUAL PROPERTY

     We rely on a combination of copyright, patent, trademark, trade secret and
other intellectual property laws, nondisclosure agreements and other protective
measures to protect our proprietary rights. We also utilize unpatented
proprietary know-how and trade secrets and employ various methods to protect our
trade secrets and know-how. We currently have three patent applications pending,
and another patent application in process, but no issued patents. Although we
employ a variety of intellectual property in the development and manufacturing
of our products, we believe that none of our intellectual property is
individually critical to our current operations. However, taken as a whole, we
believe our intellectual property rights are significant and that the loss of
all or a substantial portion of such rights could have a material adverse effect
on our results of operations. Our intellectual property protection measures may
be insufficient to prevent misappropriation of our technology. From time to
time, third parties may assert patent, copyright, trademark and other
intellectual property rights to technologies, processes or rights that are
important to our business. These assertions may result in costly and
time-consuming litigation requiring us to pay substantial damages or to redesign
or stop selling our products. In addition, the laws of many foreign countries do
not protect our intellectual properties to the same extent as the laws of the
United
                                       46
<PAGE>   50

States. We may desire or be required to renew or to obtain licenses from others
in order to further develop and market commercially viable products effectively.
Any necessary licenses may not be available on reasonable terms.

EMPLOYEES

     As of April 30, 2000, we employed 126 full-time employees including 46 in
sales and marketing, 10 in operations, 55 in research and development, and 15 in
finance and administration. Our employees are not covered by any
collective-bargaining agreements, and we consider our relations with our
employees to be good.

FACILITIES

     Our principal executive offices are currently located in Fremont,
California, where we lease approximately 23,000 square feet. We are in the
process of negotiating a new lease for approximately 52,000 square feet of space
in a building located in Newark, California. We expect to sign a seven year
lease beginning in August 2000. We believe that these facilities will be
adequate to meet our requirements for the foreseeable future. We also have a
sales office in Basking Ridge, New Jersey, where we lease approximately 1,600
square feet.

LEGAL PROCEEDINGS

     From time to time, we may be involved in litigation relating to claims
arising out of the ordinary course of business. As of the date of this
prospectus, there are no material legal proceedings pending or, to our
knowledge, threatened against us.

                                       47
<PAGE>   51

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

     The following table shows information about our executive officers and
directors as of March 31, 2000:

<TABLE>
<CAPTION>
NAME                                   AGE                         POSITION(S)
- ----                                   ---    ------------------------------------------------------
<S>                                    <C>    <C>
Steven M. Bauman.....................  55     President, Chief Executive Officer and Director
Joshua W. Soske......................  41     Executive Vice President, Chief Technical Officer and
                                              Director
Gaymond W. Schultz...................  59     Executive Vice President
Stanley E. Kazmierczak...............  40     Vice President, Finance and Administration, Chief
                                              Financial Officer and Secretary
Thomas J. Barsi......................  32     Vice President, Business Development
Kay E. Kienast.......................  50     Vice President, Marketing
John W. Neese........................  50     Vice President, Engineering
T. Diane Pewitt......................  43     Vice President, Operations
C. Reid Thomas.......................  38     Vice President, Sales
W. Michael West......................  49     Chairman of the Board
Jeffrey M. Drazan....................  41     Director
John F. Malone.......................  52     Director
Philip J. Quigley....................  57     Director
Frank J. Marshall....................  53     Director
</TABLE>

     STEVEN M. BAUMAN has served as our President, Chief Executive Officer and
as a director since August 1999. Mr. Bauman was a principal at GeoPartners
Research Inc., a Cambridge, Massachusetts-based consultancy from February 1998
to August 1999. He was Vice President/General Manager, Network Systems Division
and then Vice President of Virtual Private Networks of 3Com Corporation, a
supplier of network systems, from October 1995 to February 1998. Mr. Bauman was
Vice President and General Manager, Software Group, Farallon Communications (now
Netopia) from 1993 until September 1995.

     JOSHUA W. SOSKE has served as our Executive Vice President and Chief
Technology Officer since August 1999, as a director since our inception and was
one of our founders. Mr. Soske served as our President and Chief Executive
Officer from inception until August 1999. He has been President and founder of
International Design and Research, a communications consulting firm which
provides management, architectural design and contract manufacturing services
dealing primarily with telephone, data network, and television technologies
since March 1979.

     GAYMOND W. SCHULTZ has served as our Executive Vice President since July
1996 and was one of our founders. Mr. Schultz was our Chief Financial Officer
from March 1997 until July 1999. Mr. Schultz was a partner at International
Design and Research from 1994 to June 1996. Additionally, Mr. Schultz was a
founder and served as Vice President of Engineering of StrataCom, Inc., a
provider of wide area data networking equipment, from 1985 to 1999.

     STANLEY E. KAZMIERCZAK has served as our Vice President, Finance and
Administration, Chief Financial Officer and Secretary since July 1999. Mr.
Kazmierczak served as Chief Financial Officer and Vice President, Finance and
Operations of Digital Link Corporation, a supplier of networking products, from
January 1999 to July 1999, and as Chief Financial Officer from December 1992 to
July 1999. He was Vice President, Finance and Administration of Digital Link
from March 1996 to January 1999.

     THOMAS J. BARSI has served as our Vice President, Business Development
since January 2000. Mr. Barsi served as our Director of Marketing until December
1999 and our Director of Sales from January 1999 to December 1999. Prior to
joining us, he was Director of Marketing responsible for the

                                       48
<PAGE>   52

product line of high-end business products for Pacific Bell Internet from June
1995 to July 1996 and a product manager at Pacific Bell Internet from September
1994 to June 1995.

     KAY E. KIENAST has served as our Vice President, Marketing since March
2000. Ms. Kienast was Vice President, NSA Marketing at Newbridge Networks, a
manufacturer of telecommunications equipment from August 1998 to June 1999. She
was Vice President, Marketing at Cincinnati Bell Information Systems from
January 1998 to August 1998 and was Director of Marketing at Unisys, a
telecommunications equipment manufacturer, from November 1995 to January 1998.
She was Manager, Strategy, Planning and Research at Digital Equipment
Corporation from mid 1993 to November 1995.

     JOHN W. NEESE has served as our Vice President, Engineering since March
2000. Mr. Neese was our Engineering Director from August 1996 to February 2000
and Chief Financial Officer and Secretary from August 1996 to March 1997. He was
Engineering Director at Corsair Communications, a manufacturer of cellular fraud
detection products, from August 1995 to August 1996.

     T. DIANE PEWITT has served as our Vice President, Operations since March
2000. Ms. Pewitt served as Vice President of Messaging for the service provider
line of business for Lucent Technologies from June 1999 to March 2000. She also
served as the Vice President of Operations for Lucent Technologies' Octel
Messaging Division from January 1998 to June 1999. Ms. Pewitt was also Director
of Operations for Lucent from June 1994 to January 1998.

     C. REID THOMAS has served as our Vice President, Sales since April 2000.
Mr. Thomas served as Managing Director, Sales for Lucent Technologies, where he
was responsible for AT&T Markets from August 1996 to April 2000. Prior to his
employment with Lucent, Mr. Thomas was Group Manager, Strategy and Alliances for
Octel Communications, from January 1995 to August 1996.

     W. MICHAEL WEST has served as Chairman of our board of directors since June
1999. He served as Executive Vice President for Lucent Technologies from
September 1997 to January 1998. Mr. West was President, Chief Operating Officer
and a director of Octel Communications Corporation from January 1995 to August
1997, after having served as Executive Vice President from September 1986 to
January 1995. Mr. West held multiple positions with Rolm Corporation from 1979
to September 1986, most recently as General Manager of the National Sales
Division. Mr. West currently serves as a director of Media Arts Group Inc.

     JEFFREY M. DRAZAN has served as a director since June 1996. Mr. Drazan has
been a General Partner of Sierra Ventures since 1984. He currently serves on the
boards of directors of FairMarket, Inc., and Vertel Corporation.

     JOHN F. MALONE has served as a director since January 1997. Mr. Malone has
been President and Chief Executive Officer of The Eastern Management Group, a
management consulting firm supplying professional services to major
communications companies since April 1979. Mr. Malone worked at AT&T where he
developed corporate strategy and managed sales and marketing organizations from
Ohio to New York.

     FRANK J. MARSHALL has served as a director since October 1997. Mr. Marshall
currently serves as a member of the InterWest Partners Advisory Committee and a
Venture Partner at Sequoia Capital. Mr. Marshall served as Vice President of
Engineering and Vice President and General Manager, Core Business Unit of Cisco
Systems from April 1992 to October 1997. Mr. Marshall currently serves as a
director of Covad Communications Group, Inc. and PMC-Sierra, Inc.

     PHILIP J. QUIGLEY has served as a director since April 1998. Mr. Quigley
was Chairman, President, and Chief Executive Officer of Pacific Telesis Group, a
telecommunications holding company, from April 1994 until his retirement in
December 1997. Mr. Quigley previously served as President and Chief Executive
Officer of Pacific Bell, Executive Vice President and Chief Operating Officer of
PacTel Corporation, and Chief Executive Officer of PacTel Personal
Communications. Mr. Quigley serves as a director of Wells Fargo & Company and
Nuance Communications, Inc. and as an advisory director of Thomas Weisel
Partners LLC, one of the underwriters.

                                       49
<PAGE>   53

BOARD OF DIRECTORS COMMITTEES AND OTHER INFORMATION

     We currently have seven authorized directors. All directors are elected to
hold office until the next annual meeting of our stockholders and until their
successors have been elected. There are no family relationships among any of our
directors or executive officers.

     Upon the closing of this offering, our restated certificate of
incorporation will provide for a board of directors consisting of seven members,
who will be divided into three classes serving staggered three-year terms:

     - The term of our Class I directors will expire at our 2001 annual meeting;

     - The term of our Class II directors will expire at our 2002 annual
       meeting; and

     - The term of our Class III directors will expire at our 2003 annual
       meeting.

     Our Class I directors will be Messrs.        and           . Our Class II
directors will be Messrs.        and           . Our Class III directors will be
Messrs.        ,           and           . Because we have a classified board,
only two of our seven board members will be elected at each annual stockholders'
meeting, or three in the case of elections for our Class III directors, with the
other directors continuing for the remainder of their class terms.

     Our board of directors has a compensation and an audit committee. Our
compensation committee is responsible for, among other things, determining
salaries, incentives and other forms of compensation for directors, officers and
employees and administering various incentive compensation and benefit plans.
Our board of directors established executive compensation levels for 1999.
Jeffrey M. Drazan, Philip J. Quigley and Steven M. Bauman are the current
members of the compensation committee. Mr. Bauman is a non-voting member of the
compensation committee. In 1999 Mr. Soske was a non-voting member of the
compensation committee. Our audit committee reviews our annual audit and meets
with our independent auditors to review our internal accounting procedures and
financial management practices. John F. Malone, Frank J. Marshall and Philip J.
Quigley are the current members of the audit committee.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     No interlocking relationship exists between our board of directors or
compensation committee and the board of directors or compensation committee of
any other entity, nor has any interlocking relationship existed in the past.

DIRECTOR COMPENSATION

     Except as we otherwise described below, we have not paid any cash
compensation to members of our board of directors for their services as
directors. We reimburse the directors for reasonable expenses in connection with
attendance at board and committee meetings. Directors also are eligible to
receive stock options under our 1998 Stock Plan. Upon the closing of this
offering, non-employee directors will each receive, to the extent the internal
policies of their respective organizations permit, an annual director's fee of $
          , plus $          for each board meeting.

     We pay W. Michael West an annual salary of $100,000 for his services as
chairman of the board. Additionally, in connection with his joining the board of
directors in June 1999, we sold 800,000 shares of common stock to Mr. West at a
price of $0.60 a share, subject to a repurchase right, that expires after a
four-year period, in the event that Mr. West's employment with us ceases.

EXECUTIVE COMPENSATION

     The following table summarizes all compensation paid to our Chief Executive
Officer and to our other most highly compensated executive officers other than
the Chief Executive Officer whose total annual

                                       50
<PAGE>   54

salary and bonus exceeded $100,000, for services rendered in all capacities to
us during the fiscal year ended December 31, 1999.

                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                    LONG TERM
                                                            ANNUAL COMPENSATION    COMPENSATION
                                                            -------------------    ------------
                                                                                    SECURITIES
                                                                                    UNDERLYING
NAME AND PRINCIPAL POSITION(S)                               SALARY      BONUS       OPTIONS
- ------------------------------                              --------    -------    ------------
<S>                                                         <C>         <C>        <C>
Steven M. Bauman..........................................  $ 67,634(1) $    --     1,660,000
  Chief Executive Officer and President
Joshua W. Soske...........................................   174,220         --            --
  Executive Vice President and Chief Technical Officer
Gaymond W. Schultz........................................   149,600         --            --
  Executive Vice President
C. G. Waters(2)...........................................   145,000     82,295            --
</TABLE>

- ---------------
(1) Mr. Bauman commenced his employment in August 1999 at a base salary of
    $200,000. Mr. Bauman is eligible to receive a bonus up to 50% of his base
    salary. Mr. Bauman has been guaranteed his first full year's bonus.

(2) Mr. Waters, our former vice president, sales, resigned from our company in
    January 2000.

STOCK OPTION GRANTS IN LAST FISCAL YEAR

     The following tables set forth selected information as of December 31, 1999
and for the fiscal year then ended with respect to stock options granted to and
exercised by the individuals named in the Summary Compensation Table above.

                             OPTION GRANTS IN 1999

<TABLE>
<CAPTION>
                                                                               POTENTIAL REALIZABLE VALUE AT
                                                                               ASSUMED ANNUAL RATES OF STOCK
                                            INDIVIDUAL GRANTS              PRICE APPRECIATION FOR OPTION TERM(4)
                                  --------------------------------------   -------------------------------------
                                  NUMBER OF      PERCENT OF
                                  SECURITIES   TOTAL OPTIONS
                                  UNDERLYING     GRANTED TO
                                   OPTIONS      EMPLOYEES IN    EXERCISE   EXPIRATION
NAME                              GRANTED(1)   FISCAL YEAR 99   PRICE(2)     DATE(3)        5%           10%
- ----                              ----------   --------------   --------   -----------   ---------   -----------
<S>                               <C>          <C>              <C>        <C>           <C>         <C>
Steven M. Bauman(5).............  1,160,000         28.2%        $1.00       8/23/09     $729,518    $1,848,741
                                    500,000         12.2%        $1.00       8/23/09     $314,447    $  796,871
Joshua W. Soske.................         --           --            --            --           --            --
Gaymond W. Schultz..............         --           --            --            --           --            --
C. G. Waters....................         --           --            --            --           --            --
</TABLE>

- ---------------
(1) These incentive stock options are exercisable in full immediately, but the
    shares received upon exercise are subject to repurchase by us. Our right of
    repurchase lapses as to 25% of the shares covered by the respective options
    on the first anniversary of the date of grant, and lapses ratably on a
    monthly basis thereafter, with the repurchase right terminating in full on
    the fourth anniversary of the date of grant.

(2) The exercise price for each grant is equal to 100% of the fair market value
    of our common stock on the date of grant.

(3) The options have a term of 10 years, subject to earlier termination in
    certain events related to termination of employment.

(4) The 5% and 10% assumed rates of appreciation are suggested by the rules of
    the Securities and Exchange Commission and do not represent our estimate or
    projection of the future common stock price. There can be no assurance that
    any of the values reflected in the table will be achieved.

(5) If a change of control occurs, that number of shares of Mr. Bauman's that
    would have vested over the next 24 months will immediately vest.
    Additionally, if he is terminated without good cause or resigns with good
    cause within 12 months of a change of control, his shares that would have
    vested over the 12 months following the change of control will immediately
    vest. A "change of control" will be deemed to occur if a substantial portion
    of our ownership changes or we sell substantially all of our assets.

                                       51
<PAGE>   55

AGGREGATE OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR END OPTION VALUES

     The following table provides summary information concerning stock option
exercises during our last fiscal year and options outstanding at the end of the
last fiscal year.

     The value realized represents the difference between $       , which is the
mid-point of the assumed price range of the offering, and the exercise price of
the option.

<TABLE>
<CAPTION>
                                                                    NUMBER OF SHARES
                                                                       UNDERLYING
                                                                      UNEXERCISED      VALUE OF UNEXERCISED
                                                                       OPTIONS AT          IN-THE-MONEY
                                                                      DECEMBER 31,          OPTIONS AT
                                                                          1999          DECEMBER 31, 1999
                                             SHARES                 ----------------   --------------------
                                            ACQUIRED      VALUE       EXERCISABLE/         EXERCISABLE/
                  NAME                     ON EXERCISE   REALIZED    UNEXERCISABLE        UNEXERCISABLE
                  ----                     -----------   --------   ----------------   --------------------
<S>                                        <C>           <C>        <C>                <C>
Steven M. Bauman.........................         --           --   1,660,000/0              $
Joshua W. Soske..........................         --           --       434,000
Gaymond W. Schultz.......................         --           --       245,500
C. G. Waters.............................         --           --            --
</TABLE>

STOCK PLANS

  1996 Stock Option/Stock Issuance Plan

     Our 1996 Stock Option/Stock Issuance Plan was adopted by our board of
directors and approved by our stockholders in December 1996. Upon the adoption
of our stock incentive plan in March 1998, subsequently incorporated into our
1998 Stock Plan, no further grants were made under our 1996 plan. As of March
31, 2000, 1,858,624 shares of common stock have been issued upon exercise of
options granted under the 1996 plan, options to purchase 772,940 shares of
common stock were outstanding, and no shares of our common stock remain
available for future issuance under the 1996 plan. Unless terminated sooner, the
1996 plan will terminate according to its terms in December 2006. The 1996 plan
provided for the granting of incentive stock options within the meaning of
Section 422 of the Internal Revenue Code of 1986, as amended, to employees,
officers and employee directors and the granting of nonstatutory stock options
and stock purchase rights to employees, officers, directors (including
non-employee directors) and consultants. The administrator determined the term
of options, which was prohibited from exceeding 10 years (five years in the case
of an incentive stock option granted to a stockholder holding more than 10% of
the voting shares of our company). To the extent an optionee would have the
right in any calendar year to exercise for the first time one or more incentive
stock options for shares having an aggregate fair market value in excess of
$100,000, any such excess options shall be treated as nonstatutory stock
options.

     No option may be transferred by the optionee other than by will or the laws
of descent or distribution. Each option may be exercised during the lifetime of
the optionee only by such optionee. Options granted under the 1996 plan
generally vest at the rate of one-fourth of the total number of shares subject
to the options twelve months after the vesting commencement date, and one
forty-eighth of the total number of shares subject to the options each month
thereafter.

     The restricted stock purchase agreements reflecting stock issued pursuant
to the 1996 plan provide that the purchase price for the stock must be at least
85% of the fair market value of our common stock as of the date of grant, except
in the case of a 10% stockholder, in which case the purchase price must be at
least 110% of the fair market value. The stock purchase agreements also
generally provide that we shall have a repurchase option exercisable upon the
voluntary or involuntary termination of the purchaser's employment for any
reason, including death or disability), unless the administrator determines
otherwise. Our repurchase right generally lapses at a rate one-fourth the total
number of shares subject to the repurchase right twelve months after the vesting
commencement date, and one forty-eighth of the total number of shares subject to
the repurchase right each month thereafter.

     Options will vest in full in the event of a merger, consolidation or asset
sale involving us unless the options are assumed by the successor entity, are
replaced with a cash incentive program of the successor

                                       52
<PAGE>   56

entity, or are subject to other limits imposed by the plan administrator. All
outstanding purchase rights under the plan terminate in the event of a merger,
consolidation or asset sale involving us unless these repurchase rights are
assigned to the successor entity or the termination was precluded by the plan
administrator when the purchase right was issued.

  1998 Stock Plan

     The 1998 Stock Plan was adopted by our board and stockholders in March
1998. The 1998 Stock Plan reserves for issuance      shares plus a number of
shares equal to the number of shares subject to expired, terminated or
unexercised options issued and currently outstanding under the 1996 plan. If any
option granted under the 1998 Stock Plan expires or terminates for any reason
without having been exercised in full, then the unpurchased shares subject to
that option will once again be available for additional option grants. Also, if
any option granted under the 1998 Stock Plan expires or terminates for any
reason without having been exercised in full, then the number of shares
available for issuance under the 1998 Stock Plan will be increased by a number
equal to the unpurchased shares subject to that option.

     Under the 1998 Stock Plan, all of our employees, outside directors and
consultants are eligible to purchase shares of common stock and to receive
awards of shares or grants of nonstatutory options. Employees are also eligible
to receive grants of incentive stock options, or ISOs, intended to qualify under
Section 422 of the Internal Revenue Code of 1986, as amended, or the Code. The
1998 Stock Plan is administered by the Compensation Committee of our Board of
Directors, which selects the persons to whom shares will be sold or awarded or
options will be granted, determines the number of shares to be made subject to
each sale, award or grant, and prescribes other terms and conditions, including
the type of consideration to be paid to us upon sale or exercise and vesting
schedules in connection with each sale, award or grant.

     The exercise price under the nonstatutory options generally must be at
least 85% of the fair market value of the common stock on the date of grant. The
exercise price under ISOs cannot be lower than 100% of the fair market value of
the common stock on the date of grant and, in the case of ISOs granted to
holders of more than 10% of the voting power of the Company, not less than 110%
of such fair market value. The term of an option cannot exceed 10 years, and the
term of an ISO granted to a holder of more than 10% of our voting power cannot
exceed five years. Options generally expire no later than 90 days following a
termination of employment or twelve months following the optionee's death or
permanent disability. No option may be transferred by the optionee other than by
will or the laws of descent and distribution.

     Share grants and purchases generally become vested in the event of a
merger, consolidation or asset sale involving us if the repurchase right is not
assigned to an entity that subsequently employs the purchaser or its parent or
subsidiary. Options generally become exercisable in full in the event of merger,
consolidation or asset sale involving us and the options do not remain
outstanding, are not assigned to the surviving corporation or its parent and are
not substituted for options with substantially the same terms.

     As of March 31, 2000, options to purchase an aggregate of 7,708,531 shares
of common stock under our 1998 Stock Plan were outstanding at a weighted average
per share exercise price of $0.91. A total of 1,687,808 shares of common stock
were available for future issuance under the 1998 Stock Plan as of such date.

2000 Employee Stock Purchase Plan

     Our board of directors plans to adopt a 2000 Employee Stock Purchase Plan
to be effective upon completion of this offering. We plan to submit it for
approval by our stockholders prior to the completion of this offering. A total
of                shares of common stock has been reserved for issuance under
our employee stock purchase plan. The number of shares reserved for issuance
under the 2000 Employee

                                       53
<PAGE>   57

Stock Purchase Plan will be increased on the first day of each of our fiscal
years, commencing 2001, by the lesser of:

     -   % of our fully diluted outstanding common stock on the day of the
       increase; or

     - a lesser number of shares determined by our board of directors.

     Our 2000 Employee Stock Purchase Plan, which is intended to qualify under
Section 423 of the Code, will be administered by the board of directors or by a
committee appointed by the board. Employees, including our officers and employee
directors but excluding 5% or greater stockholders, will be eligible to
participate if they are customarily employed for more than 20 hours per week and
for at least five months in any calendar year. Our 2000 Employee Stock Purchase
Plan will permit eligible employees to purchase common stock through payroll
deductions, which may not exceed 15% of an employee's compensation.

     The 2000 Employee Stock Purchase Plan will be implemented during a series
of                          , with new offering periods, other than the first
offering period, commencing on January 1 and July 1 of each year. Our 2000
Employee Stock Purchase Plan establishes
accumulation periods per year, neither of which will exceed      months. During
each accumulation period, payroll deductions will accumulate, without interest.
On the last business day of each accumulation period, purchase dates set by the
board of directors accumulated payroll deductions will be used to purchase
common stock. The initial offering period will be for a      month duration and
is expected to commence on the date of this offering. The initial accumulation
period will begin on the date of this offering and end on December 31, 2000.

     The purchase price will be equal to 85% of the fair market value per share
of common stock on either the last day of the accumulation period or on the last
trading day before the commencement of the applicable offering period, whichever
is less. Employees may withdraw their accumulated payroll deductions at any
time. Participation in our 2000 Employee Stock Purchase Plan ends automatically
on termination of employment with us. Immediately prior to the effective time of
a corporate reorganization, the participation period then in progress will
terminate and stock will be purchased with the accumulated payroll deductions
unless the 2000 Employee Stock Purchase Plan is assumed by the surviving
corporation or its parent corporation pursuant to the plan of merger or
consolidation.

401(K) PLAN

     Effective September 1999, we established a tax-qualified employee savings
and retirement plan for which our employees will generally be eligible. Under
the Vina Technologies, Inc. 401(k) Plan, employees may elect to reduce their
current compensation and have the amount of such reduction contributed to the
401(k) Plan. The 401(k) Plan permits, but does not require, additional matching
contributions to the 401(k) Plan by us on behalf of all participants in the
401(k) Plan. To date, we have made no matching contributions. The 401(k) Plan is
intended to qualify under Section 401 of the Code, so that contributions to the
401(k) Plan, and income earned on plan contributions, are not taxable to
employees until withdrawn from the 401(k) Plan, and so that contributions by us,
if any, will be deductible by us when made.

                                       54
<PAGE>   58

                           RELATED PARTY TRANSACTIONS

     In connection with our founding in July 1996, we sold 1,400,000 shares of
common stock to Gaymond W. Schultz, 1,400,000 shares of common stock to Joshua
W. Soske, 770,000 shares of common stock to John W. Neese and 770,000 shares of
common stock to Robert Luxenburg, all at a price of $0.0001 per share. These
shares are subject to a repurchase right held by us. Our repurchase right ends
in July 2000.

     From January 1997 through March 2000, we sold shares of our preferred stock
in private financings as follows:

     - an aggregate of 3,000,000 shares of Series C preferred stock at $4.00 per
       share in March and May 1998;

     - an aggregate of 790,517 shares of Series D preferred stock at $6.00 per
       share in October 1998 and April 1999; and

     - an aggregate of 3,404,140 shares of Series E preferred stock at $7.00 per
       share in January, February and March 2000.

     Each share of preferred stock will convert automatically into one share of
common stock upon the closing of this offering. The purchasers of the preferred
stock include the following directors, executive officers, holders of more than
5% of our securities and their affiliated entities:

<TABLE>
<CAPTION>
                                                SHARES OF PREFERRED STOCK
                               -----------------------------------------------------------
INVESTOR                       SERIES A     SERIES B     SERIES C     SERIES D    SERIES E
- --------                       ---------    ---------    ---------    --------    --------
<S>                            <C>          <C>          <C>          <C>         <C>
Entities affiliated with
  Sierra Ventures V,
  L.P.(1)....................  7,500,000    1,242,994      291,484    333,334     714,286
Entities affiliated with
  London Pacific Assurance
  Limited(2).................         --      146,782    1,750,000    333,334     714,286
Frank T. Marshall(3).........         --        1,194       20,000      1,000
Philip J. Quigley(4).........         --        7,456      125,000      4,107
W. Michael West..............         --                                           80,000
</TABLE>

- ---------------
(1) Includes shares held by Sierra Ventures V, L.P., Sierra Ventures VI, L.P.,
    and SV Associates VI, as nominee for its General Partner, UA General
    Partner, UA dated January 14, 1999. Jeffrey M. Drazan is a general partner
    of the Sierra Ventures entities and is our director. Other than 12,500
    shares of Series B preferred stock, 9,048 of Series D preferred stock and
    19,389 shares of Series E preferred stock owned through SV Associates VI, he
    disclaims beneficial ownership of the shares held by the Sierra Ventures
    entities except to the extent of his pecuniary interest in these shares.

(2) Includes shares held by London Pacific Life & Annuity Company and London
    Pacific Assurance Limited.

(3) Includes shares held by Frank Marshall Timark LP, of which Mr. Marshall is a
    general partner.

(4) Includes shares held by family trusts, of which Mr. Quigley is a trustee.

     The purchasers of the above shares of preferred stock are entitled to
registration rights. See "Description of Capital Stock -- Registration Rights."

     In June 1999 we sold 800,000 shares of common stock to W. Michael West, our
chairman of the board, at a price of $0.60 per share, for an aggregate purchase
price of $480,000.

     Frank J. Marshall, a director of ours, is a director of PMC-Sierra, Inc.,
which is one of our suppliers.

     We believe that the foregoing transactions were in our best interests. Our
current policy is that we will enter into transactions with our officers,
directors, 5% stockholders and their affiliates only if these transactions are
approved by a majority of the disinterested independent directors, are on terms
no less favorable to us than could be obtained from unaffiliated parties and are
reasonably expected to benefit us.

     For information concerning indemnification of directors and officers, see
"Description of Capital Stock -- Limitation of Liability and Indemnification
Matters."

                                       55
<PAGE>   59

                             PRINCIPAL STOCKHOLDERS

     The following table sets forth information as of March 31, 2000 about the
number of shares of common stock beneficially owned and the percentage of common
stock beneficially owned before and after the completion of this offering by:

     - each named executive officer;

     - each of our directors;

     - each person known to us to be the beneficial owner of more than 5% of our
       common stock; and

     - all of our directors and executive officers as a group.

     Unless otherwise noted below, the address of each beneficial owner listed
in the table is c/o VINA Technologies, Inc., 42709 Lawrence Place, Fremont,
California 94538.

     We have determined beneficial ownership in accordance with the rules of the
Securities and Exchange Commission. Except as indicated by the footnotes below,
we believe, based on the information furnished to us, that the persons and
entities named in the tables below have sole voting and investment power with
respect to all shares of common stock that they beneficially own, subject to
applicable community property laws.

     There were 27,861,752 shares of common stock outstanding on March 31, 2000
which assumes the conversion of all outstanding shares of preferred stock into
shares of common stock, and, for purposes of the table below, we have assumed
that           shares of common stock will be outstanding upon completion of
this offering. In computing the number of shares of common stock beneficially
owned by a person and the percentage ownership of that person, we deemed
outstanding shares of common stock subject to options held by that person that
are currently exercisable or exercisable within 60 days of March 31, 2000. We
did not deem these shares outstanding, however, for the purpose of computing the
percentage ownership of any other person. Asterisks represent beneficial
ownership of less than one percent.

<TABLE>
<CAPTION>
                                                                                   PERCENTAGE OF
                                                                                    COMMON STOCK
                                                                                 BENEFICIALLY OWNED
                                                           NUMBER OF SHARES     --------------------
                                                           OF COMMON STOCK      PRIOR TO     AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER                      BENEFICIALLY OWNED    OFFERING    OFFERING
- ------------------------------------                      ------------------    --------    --------
<S>                                                       <C>                   <C>         <C>
DIRECTORS AND EXECUTIVE OFFICERS:
Steven M. Bauman(1).....................................       1,560,000           5.3%
Joshua W. Soske(2)......................................       2,284,200           7.9
Gaymond W. Schultz(3)...................................       1,895,500           6.7
Jeffrey M. Drazan(4)....................................      10,309,098          36.9
John F. Malone(5).......................................         150,000             *
Philip J. Quigley(6)....................................         286,563           1.0
Frank J. Marshall(7)....................................         102,194             *
W. Michael West(8)......................................         880,000           3.1
C. G. Waters(9).........................................         243,833             *
</TABLE>

                                       56
<PAGE>   60

<TABLE>
<CAPTION>
                                                                                   PERCENTAGE OF
                                                                                    COMMON STOCK
                                                                                 BENEFICIALLY OWNED
                                                           NUMBER OF SHARES     --------------------
                                                           OF COMMON STOCK      PRIOR TO     AFTER
NAME AND ADDRESS OF BENEFICIAL OWNER                      BENEFICIALLY OWNED    OFFERING    OFFERING
- ------------------------------------                      ------------------    --------    --------
<S>                                                       <C>                   <C>         <C>
5% STOCKHOLDERS:
Entities affiliated with London Pacific Assurance
  Limited(10)...........................................       2,944,402          10.6
  Minden House
  6 Minden Place
  St. Melier, Jersey
  JE 24WQ, UK
Entities affiliated with Sierra Ventures V, L.P.(11)....      10,082,098          36.2
  3000 Sand Hill Road
  Building 4, Suite 210
  Menlo Park, CA 94025
All Directors and Executive Officers as a group (15
  persons)(12)..........................................      20,528,388          62.9
</TABLE>

- ---------------
  *  Less than 1%.

 (1) Includes 1,560,000 shares subject to options exercisable within 60 days
     after March 31, 2000.

 (2) Includes 87,500 shares subject to our repurchase at cost as of March 31,
     2000 and 884,200 shares subject to options exercisable within 60 days after
     March 31, 2000.

 (3) Includes 87,500 shares subject to our repurchase at cost as of March 31,
     2000 and 495,500 shares subject to options exercisable within 60 days after
     March 31, 2000.

 (4) Includes 32,709 shares subject to our repurchase at cost as of March 31,
     2000, 70,000 shares subject to options exercisable within 60 days after
     March 31, 2000, 9,397,915 shares held by Sierra Ventures V, L.P., 654,080
     shares held by Sierra Ventures VI, L.P. and 30,131 shares held by SV
     Associates VI, as nominee for its General Partner, UA General Partner, UA
     dated January 14, 1997. Jeffrey M. Drazan is a general partner of Sierra
     Ventures entities and is a director of ours. Other than 40,927 shares
     issued upon conversion of preferred stock owned through SV Associates VI,
     he disclaims beneficial ownership of the shares held by Sierra Ventures
     entities, except to the extent of his pecuniary interest in these shares.

 (5) Includes 150,000 shares subject to options exercisable within 60 days of
     March 31, 2000.

 (6) Includes 70,000 shares subject to options exercisable within 60 days of
     March 31, 2000, 41,667 shares subject to our repurchase at cost as of March
     31, 2000, and 136,563 shares held by a family trust of which Mr. Quigley is
     a trustee.

 (7) Includes 28,334 shares subject to our repurchase at cost as of March 31,
     2000.

 (8) Includes 720,000 shares subject to our repurchase at cost as of March 31,
     2000.

 (9) Does not include options to purchase 26,041 shares, which expired in April
     2000.

(10) Includes 714,286 shares held by London Pacific Life & Annuity Company and
     2,230,116 shares held by London Pacific Assurance Limited.

(11) Includes 9,397,915 shares held by Sierra Ventures V, L.P., 654,080 shares
     held by Sierra Ventures VI, L.P. and 30,103 shares held by SV Associates
     VI, as nominee for its General Partner, UA General Partner, UA dated
     January 14, 1997.

(12) Includes 4,784,700 shares subject to options exercisable within 60 days of
     March 31, 2000 and 1,463,835 shares subject to our repurchase at cost as of
     March 23, 2000.

                                       57
<PAGE>   61

                          DESCRIPTION OF CAPITAL STOCK

     The following description of our securities and provisions of our amended
and restated certificate of incorporation and bylaws is only a summary. You
should also refer to the copies of our restated certificate and bylaws which
have been filed with the Securities and Exchange Commission as exhibits to our
registration statement, of which this prospectus forms a part, and to the
provisions of Delaware law.

     Upon the closing of this offering, our authorized capital stock, after
giving effect to the conversion of all outstanding preferred stock into common
stock, and the amendment of our certificate of incorporation, will consist of
125,000,000 shares of common stock, $0.0001 par value, and 5,000,000 shares of
preferred stock, $0.0001 par value.

COMMON STOCK

     As of March 31, 2000 there were 27,861,752 shares of common stock
outstanding held by approximately 171 stockholders of record, assuming the
automatic conversion of each outstanding share of preferred stock upon the
closing of this offering.

     The holders of our common stock are entitled to one vote for each share
held of record on all matters submitted to a vote of the stockholders, including
the election of directors, and do not have cumulative voting rights.
Accordingly, the holders of a majority of the shares of common stock entitled to
vote in any election of directors can elect all of the directors standing for
election, if they so choose. Subject to preferences that may be applicable to
any then outstanding preferred stock, holders of common stock are entitled to
receive ratably such dividends, if any, as may be declared by the Board of
Directors out of funds legally available therefor. See "Dividend Policy." Upon
our liquidation, dissolution or winding up, the holders of common stock will be
entitled to share ratably in the net assets legally available for distribution
to stockholders after the payment of all of our debts and other liabilities,
subject to the prior rights of any preferred stock then outstanding. Holders of
common stock have no preemptive or conversion rights or other subscription
rights and there are no redemption or sinking funds provisions applicable to the
common stock. All outstanding shares of common stock are, and the common stock
to be outstanding upon completion of this offering will be, fully paid and
nonassessable.

PREFERRED STOCK

     Upon the closing of this offering, all outstanding shares of preferred
stock will be converted into common stock. See Note 6 of notes to consolidated
financial statements for a description of the currently outstanding preferred
stock. Following the conversion, our certificate of incorporation will be
restated to delete all references to the prior series of preferred stock, and
5,000,000 shares of undesignated preferred stock will be authorized. The board
of directors has the authority, without further action by the stockholders, to
issue from time to time the preferred stock in one or more series and to fix the
number of shares, designations, preferences, powers, and relative,
participating, optional or other special rights and the qualifications or
restrictions thereof. The preferences, powers, rights and restrictions of
different series of preferred stock may differ with respect to dividend rates,
amounts payable on liquidation, voting rights, conversion rights, redemption
provisions, sinking fund provisions, and purchase funds and other matters. The
issuance of preferred stock could decrease the amount of earnings and assets
available for distribution to holders of common stock or affect adversely the
rights and powers, including voting rights, of the holders of common stock, and
may have the effect of delaying, deferring or preventing a change in control of
us.

REGISTRATION RIGHTS

     After this offering, the holders of 17,694,657 shares of common stock
issued upon conversion of the preferred stock are entitled to rights with
respect to the registration of such shares under the Securities Act. If we
propose to register any of our securities under the Securities Act for our own
account, holders of common stock issuable upon conversion of the preferred stock
are entitled to notice of such registration and are entitled to include their
shares therein, provided, among other conditions, that the underwriters of
                                       58
<PAGE>   62

any such offering have the right to limit the number of shares included in such
registration. These holders have waived their rights to include their shares in
this offering. One hundred and eighty days after the effective date of the
Registration Statement of which this prospectus is a part, holders of at least
30% of the common stock issuable upon conversion of the preferred stock may
require us to prepare and file a registration statement under the Securities Act
at our expense covering the common stock issuable upon conversion of the
preferred stock provided that the shares to be included in such registration
have an anticipated aggregate public offering price of at least $10,000,000, and
we are required to use our best efforts to effect such registration, subject to
limitations. We are not obligated to effect more than two of these
stockholder-initiated registrations. Further, holders of common stock issuable
upon conversion of the preferred stock may require us to file additional
registration statements on Form S-3, subject to limitations.

DELAWARE ANTI-TAKEOVER LAW AND SELECTED CHARTER PROVISIONS

     We are subject to the provisions of Section 203 of the Delaware General
Corporation Law, or Delaware Law, an anti-takeover law. 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 a merger, asset sale or other transaction
resulting in financial benefit to the stockholder. An "interested stockholder"
is a person who, together with affiliates and associates, owns (or within three
years prior, did own) 15% or more of the corporation's voting stock.

     Upon the closing of this offering, our directors will be divided into three
classes. The number of directors will be distributed among the three classes so
that each class will consist of one-third of the board of directors. The
classification of the board of directors will have the effect of requiring at
least two annual stockholder meetings, instead of one, to replace a majority of
the directors, which could have the effect of delaying or preventing a change in
control of our company. Our restated certificate will authorize only the board
of directors to fill vacancies, including newly created directorships. Our
restated certificate will also provide that directors may be removed by
stockholders only for cause and only by the affirmative vote of holders of
two-thirds of the outstanding shares of voting stock.

     Upon the closing of this offering, our certificate of incorporation will
provide that our bylaws may be repealed or amended only by a two-thirds vote of
the board of directors or a two-thirds stockholder vote. Further, the
certificate of incorporation will require that all stockholder action be taken
at a stockholders' meeting. In addition, those provisions of the certificate of
incorporation may only be amended or repealed by the holders of at least
two-thirds of the voting power of all the then-outstanding shares of stock
entitled to vote generally for the election of directors voting together as a
single class. The provisions described above, together with the ability of the
board of directors to issue preferred stock as described above, may have the
effect of deterring a hostile takeover or delaying a change in our control or
management.

LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS

     We have adopted provisions in our certificate of incorporation that limit
the liability of our directors for monetary damages for breach of their
fiduciary duty as directors, except for liability that cannot be eliminated
under the Delaware Law. The Delaware Law provides that directors of a company
will not be personally liable for monetary damages for breach of their fiduciary
duty as directors, except for liability

     - for any breach of their duty of loyalty to us or our stockholders,

     - for acts or omissions not in good faith or which involve intentional
       misconduct or a knowing violation of law,

     - for unlawful payment of dividend or unlawful stock repurchase or
       redemption, as provided Section 174 of the Delaware Law, or

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

                                       59
<PAGE>   63

     Any amendment or repeal of these provisions requires the approval of the
holders of shares representing at least 66 2/3% of our shares entitled to vote
in the election of directors, voting as one class.

     Our certificate of incorporation and bylaws also provide that we will
indemnify our directors and officers to the fullest extent permitted by the
Delaware Law. We have entered into separate indemnification agreements with our
directors and executive officers that could require us, among other things, to
indemnify them against liabilities that may arise by reason of their status or
service as directors and to advance their expenses incurred as a result of any
proceeding against them as to which they could be indemnified. We believe that
the limitation of liability provision in our restated certificate of
incorporation and the indemnification agreements will facilitate our ability to
continue to attract and retain qualified individuals to serve as directors and
officers of us.

TRANSFER AGENT AND REGISTRAR

     The transfer agent and registrar for the common stock is           .

                                       60
<PAGE>   64

                                RESCISSION OFFER

REASONS FOR THE OFFER

     The issuance of shares and options between January 1997 and January 1998
under our 1996 Stock Option Plan may not have been exempt from qualification
under California state securities laws. If the issuances were not exempt, we may
have violated the qualification requirements of California state securities
laws.

TERMS OF THE OFFER

     As a result, we intend to make a repurchase offer to the holders of these
shares and options. This offer will be held open for 30 days after the date of
the offer to repurchase. These holders will be able to accept our repurchase
offer before the expiration date of the offer by returning to us shares and
options to be repurchased and an election notice that we will deliver to the
holders of these shares and options. If accepted, our repurchase offer could
require us to make total payments to those holders of up to approximately
$353,000 plus statutory interest.

SHARES AND OPTIONS SUBJECT TO THE OFFER

     This repurchase offer will cover a total of 3,089,900 shares issuable under
options granted under the 1996 Stock Option Plan, of which 1,858,624 shares were
issued upon option exercises and 772,940 shares were never exercised. We will
offer to repurchase shares issued upon options exercised at the price per share
paid for them under the 1996 Stock Option Plan, plus interest at a statutory
rate from the date of purchase by the purchaser to the expiration of the
repurchase offer. Also, we will offer to repurchase the prior option grants that
have not been exercised at a price of 20% of the exercise price per share. If
these holders reject the repurchase offer, we may continue to be liable under
state securities laws for up to a total amount of approximately $353,000 plus
statutory interest of 7% per year.

     We are not aware of any repurchase claims against us.

                        SHARES ELIGIBLE FOR FUTURE SALE

     Prior to this offering there has been no public market for our common
stock, and no predictions can be made regarding the effect, if any, that market
sales of shares or the availability of shares for sale will have on the market
price prevailing from time to time. As described below, only a limited number of
shares will be available for sale shortly after this offering due to contractual
and legal restrictions on resale. Nevertheless, sales of our common stock in the
public market after the restrictions lapse, or the perception that such sales
may occur, could adversely affect the prevailing market price.

SALE OF RESTRICTED SHARES

     Upon completion of this offering, we will have outstanding           shares
of common stock. The           shares of common stock being sold hereby will be
freely tradable (other than by any of our "affiliates" as defined in Rule 144(a)
under the Securities Act) without restriction or registration under the
Securities Act. All remaining shares were issued and sold by us in private
transactions and are eligible for public sale if registered under the Securities
Act or sold in accordance with Rule 144 or Rule 701 thereunder.

LOCK-UP AGREEMENTS

     Our directors, executive officers and certain stockholders, who
collectively hold an aggregate of           shares of common stock, have agreed
that they will not sell any common stock owned by them without the prior written
consent of the representatives of the underwriters for a period of 180 days from
the date of this prospectus. Transfers or dispositions can be made sooner only
with the prior written consent of Lehman Brothers Inc. As a result of the
lock-up agreements described above and the provisions
                                       61
<PAGE>   65

of Rules 144, 144(k) and 701, the restricted shares will be available for sale
in the public market as follows:

     - no shares will be eligible for sale prior to 180 days after the date of
       this prospectus;

     - shares will be eligible for sale upon the expiration of the lock-up
       agreements, described above, beginning 180 days after the date of this
       prospectus; and

     - shares will be eligible for sale upon the exercise of vested options 180
       days after the date of this prospectus.

See "Underwriting."

RULE 144

     In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this prospectus, a person deemed to be our affiliate, or a person
holding restricted shares who beneficially owns shares that were not acquired
from us or one of our affiliates within the previous one year, would be entitled
to sell within any three-month period a number of shares that does not exceed
the greater of:

     - 1% of the then outstanding shares of common stock, approximately
                 shares immediately after this offering, assuming no exercise of
       the underwriters' over-allotment option, or

     - the average weekly trading volume of the common stock during the four
       calendar weeks preceding the date on which notice of the sale is filed
       with the SEC.

     Sales under Rule 144 are subject to requirements relating to manner of
sale, notice and availability of current public information about us. However,
if a person (or persons whose shares are aggregated) is not deemed to have been
our affiliate at any time during the 90 days immediately preceding the sale, he
or she may sell his or her restricted shares under Rule 144(k) without regard to
the limitations described above, if at least two years have elapsed since the
later of the date the shares were acquired from us or from our affiliate.
          shares will qualify as "Rule 144(k) shares" within 180 days after the
date of this prospectus. The foregoing is a summary of Rule 144 and is not
intended to be a complete description of it.

RULE 701

     Subject to limitations on the aggregate offering price of a transaction and
other conditions, Rule 701 may be relied upon with respect to the resale of
securities originally purchased from us by our employees, directors, officers,
consultants or advisers prior to the closing of this offering, pursuant to
written compensatory benefit plans or written contracts relating to the
compensation of such persons. In addition, the SEC has indicated that Rule 701
will apply to stock options granted by us before this offering, along with the
shares acquired upon exercise of such options. Securities issued in reliance on
Rule 701 are deemed to be restricted shares and, beginning 90 days after the
date of this prospectus unless subject to the contractual restrictions described
above, may be sold 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 the two-year minimum holding period requirements.

STOCK OPTIONS

     We intend to file a registration statement under the Securities Act
covering approximately           shares of common stock reserved for issuance
under our stock plans. Such registration statement is expected to be filed soon
after the date of this prospectus and will automatically become effective upon
filing. Accordingly, shares registered under such registration statement will be
available for sale in the open market, unless such shares are subject to vesting
restrictions with us or the contractual restrictions described above.

                                       62
<PAGE>   66

REGISTRATION RIGHTS

     In addition, after this offering, the holders of approximately 17,694,657
shares of common stock will be entitled to rights to cause us to register the
sale of such shares under the Securities Act. Registration of these shares under
the Securities Act would result in these shares, other than shares purchased by
our affiliates, becoming freely tradable without restriction under the
Securities Act immediately upon the effectiveness of such registration. See
"Description of Capital Stock -- Registration Rights."

                                       63
<PAGE>   67

                                  UNDERWRITING

     Under the underwriting agreement, which is filed as an exhibit to the
registration statement relating to this prospectus, the underwriters named
below, for whom Lehman Brothers Inc., Thomas Weisel Partners LLC and U.S.
Bancorp Piper Jaffray Inc. are acting as representatives, have each agreed to
purchase from us the respective number of shares of common stock shown opposite
its name below:

<TABLE>
<CAPTION>
                                                                 NUMBER
UNDERWRITERS                                                    OF SHARES
- ------------                                                    ---------
<S>                                                             <C>
Lehman Brothers Inc.........................................
Thomas Weisel Partners LLC..................................
U.S. Bancorp Piper Jaffray Inc..............................

                                                                --------
     Total..................................................
                                                                ========
</TABLE>

     The underwriting agreement provides that the underwriters' obligations to
purchase shares of common stock depend on the satisfaction of the conditions
contained in the underwriting agreement. It also provides that, if any of the
shares of common stock are purchased by the underwriters under the underwriting
agreement, then all of the shares of common stock that the underwriters have
agreed to purchase under the underwriting agreement must be purchased. The
conditions contained in the underwriting agreement include the requirement that:

     - the representations and warranties made by us to the underwriters are
       true;

     - there is no material change in the financial markets; and

     - we deliver customary closing documents to the underwriters.

     The representatives have advised us that the underwriters propose to offer
the shares of common stock directly to the public at the public offering price
set forth on the cover page of this prospectus and to selected dealers, who may
include the underwriters, at this public offering price less a selling
concession not in excess of $     per share. The underwriters may allow, and the
selected dealers may reallow, a concession not in excess of $     per share to
brokers and dealers. After the offering, the underwriters may change the
offering price and other selling terms.

     We have granted to the underwriters an option to purchase up to an
aggregate of           additional shares of common stock, exercisable to cover
over-allotments, if any, at the public offering price less the underwriting
discount shown on the cover page of this prospectus. The underwriters may
exercise this option at any time until 30 days after the date of the
underwriting agreement. If this option is exercised, each underwriter will be
committed, so long as the conditions of the underwriting agreement are
satisfied, to purchase a number of additional shares of common stock
proportionate to the underwriter's initial commitment, as indicated in the table
above and we will be obligated, under the over-allotment option, to sell the
shares of common stock to the underwriters.

     The following table shows the per share and total underwriting discounts to
be paid to the underwriters by us. These amounts are shown assuming both no
exercise and full exercise of the underwriters' option to purchase additional
shares.

<TABLE>
<CAPTION>
PAID BY VINA                                                  NO EXERCISE    FULL EXERCISE
- ------------                                                  -----------    -------------
<S>                                                           <C>            <C>
Per share...................................................    $               $
Total.......................................................
</TABLE>

     We have agreed that, without the prior consent of Lehman Brothers Inc., we
will not, directly or indirectly, offer, sell or otherwise dispose of any shares
of common stock or any securities that may be converted into or exchanged for
any shares of common stock for a period of 180 days from the date of this
prospectus, except that we may, without their consent, grant options and sell
shares under our incentive and purchase plans, although the shares may not be
resold in the public market during the lock-up period. [All of our executive
officers, directors and stockholders holding all of the shares of our capital
stock,

                                       64
<PAGE>   68

including all of the holders of the preferred stock], have agreed under lock-up
agreements that, without prior written consent, they will not, directly or
indirectly, offer, sell or otherwise dispose of any shares of common stock or
any securities that may be converted into or exchanged for any shares of common
stock for the period ending 180 days after the date of this prospectus. Lehman
Brothers Inc. may, in its sole discretion, waive the restrictions of the lock-up
agreements at an earlier time without prior notice or announcement and allow one
or more stockholders to sell all or any portion of their shares. See "Shares
Eligible for Future Sale."

     Prior to the offering, there has been no public market for the shares of
common stock. The initial public offering price will be negotiated between the
representatives and us. In determining the initial public offering price of the
common stock, the representatives will primarily consider, among other things
and in addition to prevailing market conditions:

     - our historical performance and capital structure;

     - estimates of our business potential and earning prospects;

     - an overall assessment of our management; and

     - the consideration of the above factors in relation to market valuations
       of companies in related businesses.

     Application will be made to have our common stock approved for quotation on
the Nasdaq National Market under the symbol "VINA."

     We have agreed to indemnify the underwriters against liabilities, including
liabilities under the Securities Act and liabilities arising from breaches of
the representations and warranties contained in the underwriting agreement, and
to contribute to payments that the underwriters may be required to make for
these liabilities.

     We estimate that the total expenses of the offering, excluding the
underwriting discount, will be approximately $     .

     Until the distribution of the common stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the underwriters and
selling group members to bid for and purchase shares of common stock. As an
exception to these rules, the representatives are permitted to engage in
transactions that stabilize the price of the common stock. These transactions
may consist of bids or purchases for the purposes of pegging, fixing or
maintaining the price of the common stock.

     The underwriters may create a short position in the common stock in
connection with the offering, which means that they may sell more shares than
are set forth on the cover page of this prospectus. If the underwriters create a
short position, then the representatives may reduce that short position by
purchasing common stock in the open market. The representatives also may elect
to reduce any short position by exercising all or part of the over-allotment
option.

     The representatives also may impose a penalty bid on underwriters and
selling group members. This means that, if the representatives purchase shares
of common stock in the open market to reduce the underwriters' short position or
to stabilize the price of the common stock, they may reclaim the amount of the
selling concession from the underwriters and selling group members that sold
those shares as part of the offering.

     In general, purchases of a security for the purpose of stabilization or to
reduce a syndicate short position could cause the price of the security to be
higher than it might otherwise be in the absence of these purchases. The
imposition of a penalty bid might have an effect on the price of a security to
the extent that it was to discourage resales of the securities by purchasers in
an offering.

     Neither we nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the common stock. In

                                       65
<PAGE>   69

addition, neither we nor any of the underwriters makes any representation that
the representatives will engage in these transactions or that these
transactions, once commenced, will not be discontinued without notice.

     Any offers in Canada will be made only under an exemption from the
requirements to file a prospectus in the relevant province of Canada in which
the sale is made.

     Purchasers of the shares of common stock offered in this prospectus may be
required to pay stamp taxes and other charges under the laws and practices of
the country of purchase, in addition to the offering price listed on the cover
page of this prospectus.

     The underwriters have informed us that they do not intend to confirm the
sales of shares of common stock offered by this prospectus to any accounts over
which they exercise discretionary authority in excess of 5% of the shares
offered by them.

     At our request, the underwriters have reserved up to                shares
of the common stock offered by this prospectus for sale to our officers,
directors, employees and their family members and to our business associates at
the initial public offering price set forth on the cover page of this
prospectus. These persons must commit to purchase no later than the close of
business on the day following the date of this prospectus. The number of shares
available for sale to the general public will be reduced to the extent these
persons purchase the reserved shares.

     Thomas Weisel Partners LLC, one of the representatives of the underwriters,
was organized and registered as a broker/dealer in December 1998. Since December
1998, Thomas Weisel Partners has acted as a lead or co-manager on numerous
public offerings of equity securities.

     Fidelity Capital Markets, a division of National Financial Services
Corporation, is acting as an underwriter of this offering and will be
facilitating electronic distribution through the Internet.

                                 LEGAL MATTERS

     Selected legal matters with respect to the validity of the common stock
offered by this prospectus will be passed upon for us by Pillsbury Madison &
Sutro LLP, San Francisco, California. Selected legal matters relating to the
offering will be passed upon for the underwriters by Gibson, Dunn & Crutcher
LLP, San Francisco, California.

                                    EXPERTS

     The consolidated financial statements as of December 31, 1998 and 1999 and
for each of the three years in the period ended December 31, 1999 included in
this prospectus and the related consolidated financial statement schedule
included elsewhere in the registration statement have been audited by Deloitte &
Touche LLP, independent auditors, as stated in their reports appearing herein
and elsewhere in the registration statement, and have been so included in
reliance upon the reports of such firm given upon their authority as experts in
accounting and auditing.

                   WHERE YOU CAN FIND ADDITIONAL INFORMATION

     We have filed with the Securities and Exchange Commission a registration
statement under the Securities Act of 1933 with respect to the common stock
offered by this prospectus. This prospectus does not contain all of the
information set forth in the registration statement and the exhibits and
schedules to the registration statement. Please refer to the registration
statement, exhibits and schedules for further information with respect to VINA
and the common stock offered by this prospectus. Statements contained in this
prospectus regarding the contents of any contract or other document are not
necessarily complete. With respect to any contract or document filed as an
exhibit to the registration statement, you should refer to the exhibit for a
copy of the contract or document, and each statement in this prospectus
regarding that contract or document is qualified by reference to the exhibit. A
copy of the registration statement and its exhibits and schedules may be
inspected without charge at the SEC's public reference room, located at
                                       66
<PAGE>   70

450 Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC at
1-800-SEC-0330 for further information on the public reference room. Our SEC
filings are also available to the public from the SEC's website at www.sec.gov.

     Upon completion of this offering, we will be subject to the information
reporting requirements of the Securities Exchange Act of 1934, as amended, and
we will file reports, proxy statements and other information with the SEC.

     We intend to furnish our stockholders with annual reports containing
financial statements audited by independent certified public accountants and
quarterly reports containing unaudited financial information for the first three
quarters of each fiscal year.

                                       67
<PAGE>   71

                            VINA TECHNOLOGIES, INC.

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Independent Auditors' Report................................  F-2
Consolidated Balance Sheets as of December 31, 1998 and 1999
  and March 31, 2000 (Unaudited)............................  F-3
Consolidated Statements of Operations for the Years Ended
  December 31, 1997, 1998 and 1999 and for the Three Months
  Ended March 31, 1999 (Unaudited) and 2000 (Unaudited).....  F-4
Consolidated Statements of Shareholders' Equity for the
  Years Ended December 31, 1997, 1998 and 1999 and for the
  Three Months Ended March 31, 2000 (Unaudited).............  F-5
Consolidated Statements of Cash Flows for the Years Ended
  December 31, 1997, 1998 and 1999 and for the Three Months
  Ended March 31, 1999 (Unaudited) and 2000 (Unaudited).....  F-6
Notes to Consolidated Financial Statements..................  F-7
</TABLE>

                                       F-1
<PAGE>   72

                          INDEPENDENT AUDITORS' REPORT

To the Board of Directors and Shareholders of
VINA Technologies, Inc.:

     We have audited the accompanying consolidated balance sheets of VINA
Technologies, Inc. and its subsidiary as of December 31, 1998 and 1999, and the
related consolidated statements of operations, shareholders' equity and cash
flows for each of the three years in the period ended December 31, 1999. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

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

     In our opinion, such consolidated financial statements present fairly, in
all material respects, the financial position of VINA Technologies, Inc. and its
subsidiary as of December 31, 1998 and 1999, and the results of their operations
and their cash flows for the each of the three years in the period ended
December 31, 1999 in conformity with accounting principles generally accepted in
the United States of America.

DELOITTE & TOUCHE LLP

San Jose, California
March 17, 2000

                                       F-2
<PAGE>   73

                            VINA TECHNOLOGIES, INC.

                          CONSOLIDATED BALANCE SHEETS
               (IN THOUSANDS, EXCEPT SHARE AND PER SHARE AMOUNTS)

                                     ASSETS

<TABLE>
<CAPTION>
                                                                                          PRO FORMA
                                                           DECEMBER 31,                   (NOTE 1)
                                                        -------------------   MARCH 31,   MARCH 31,
                                                          1998       1999       2000        2000
                                                        --------   --------   ---------   ---------
                                                                                   (UNAUDITED)
<S>                                                     <C>        <C>        <C>         <C>
Current assets:
  Cash and cash equivalents...........................  $  7,355   $  2,568   $  8,915
  Short-term investments..............................     4,004         --     12,642
  Accounts receivable, net of allowances of $109, $221
     and $236 in 1998, 1999 and 2000, respectively....     1,617      2,469      3,212
  Inventories.........................................         8         96         90
  Prepaid expenses and other..........................       326        166        305
                                                        --------   --------   --------
       Total current assets...........................    13,310      5,299     25,164
Property and equipment, net...........................     1,058      1,356      1,684
Other assets..........................................        88         18        118
                                                        --------   --------   --------
       Total assets...................................  $ 14,456   $  6,673   $ 26,966
                                                        ========   ========   ========
                               LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities:
  Accounts payable....................................  $    864   $  3,521   $  3,303
  Accrued compensation and related benefits...........       450        891        923
  Accrued warranty....................................       152        449        483
  Other current liabilities...........................       436        410        492
  Current portion of long-term debt...................       350        520        520
                                                        --------   --------   --------
       Total current liabilities......................     2,252      5,791      5,721
                                                        --------   --------   --------
Long-term debt........................................       655        534        404
                                                        --------   --------   --------
Commitments (Note 5)
Shareholders' equity:
  Convertible preferred stock; shares authorized: 1998
     and 1999, 15,000,000; 2000, 18,500,000; none
     issued and outstanding on a pro forma basis;
     aggregate liquidation preference of $24,993 in
     1999:
     Series A; $0.10 par value; 7,500,000 shares
       designated and outstanding.....................       744        744        744    $     --
     Series B; $2.50 par value; 3,000,000 shares
       designated and outstanding.....................     7,488      7,488      7,488          --
     Series C; $4.00 par value; 3,200,000 shares
       designated; 3,000,000 shares outstanding.......    11,345     11,345     11,345          --
     Series D; $6.00 par value; 1,200,000 shares
       designated; shares outstanding: 1998, 779,771;
       1999 and 2000, 790,517.........................     4,657      4,722      4,722          --
     Series E; $7.00 par value; 3,600,000 shares
       designated; 3,404,140 shares outstanding in
       2000...........................................        --         --     23,821          --
  Common stock; no par value; 35,000,000 shares
     authorized; shares outstanding: 1998, 6,681,918;
     1999, 8,746,081; 2000: actual, 10,167,095; pro
     forma, 27,861,752................................       837     19,784     37,697      85,817
  Subscription receivable.............................       (25)        --         --          --
  Deferred stock compensation.........................      (361)   (13,523)   (26,959)    (26,959)
  Accumulated deficit.................................   (13,136)   (30,212)   (38,017)    (38,017)
                                                        --------   --------   --------    --------
       Total shareholders' equity.....................    11,549        348     20,841      20,841
                                                        --------   --------   --------    --------
       Total liabilities and shareholders' equity.....  $ 14,456   $  6,673   $ 26,966    $ 26,966
                                                        ========   ========   ========    ========
</TABLE>

                See notes to consolidated financial statements.
                                       F-3
<PAGE>   74

                            VINA TECHNOLOGIES, INC.

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

<TABLE>
<CAPTION>
                                                                               THREE MONTHS
                                                YEARS ENDED DECEMBER 31,      ENDED MARCH 31,
                                              ----------------------------   -----------------
                                               1997      1998       1999      1999      2000
                                              -------   -------   --------   -------   -------
                                                                                (UNAUDITED)
<S>                                           <C>       <C>       <C>        <C>       <C>
Net revenue.................................  $   579   $ 4,393   $ 12,700   $ 2,903   $ 5,187
Cost of revenue
  (excluding amortization of deferred stock
  compensation).............................      542     2,054      7,713     1,486     3,239
                                              -------   -------   --------   -------   -------
Gross profit
  (excluding amortization of deferred stock
  compensation).............................       37     2,339      4,987     1,417     1,948
                                              -------   -------   --------   -------   -------
Costs and expenses:
  Research and development
     (excluding amortization of deferred
     stock compensation)....................    1,906     4,174      6,690     1,280     2,505
  Selling, general and administrative
     (excluding amortization of deferred
     stock compensation)....................    2,532     6,414     10,881     2,077     3,721
  Amortization of deferred stock
     compensation*..........................       79       154      4,715       117     3,653
                                              -------   -------   --------   -------   -------
          Total costs and expenses..........    4,517    10,742     22,286     3,474     9,879
                                              -------   -------   --------   -------   -------
Loss from operations........................   (4,480)   (8,403)   (17,299)   (2,057)   (7,931)
Interest income.............................      205       493        355       121       155
Interest expense............................      (40)      (80)      (132)      (30)      (29)
                                              -------   -------   --------   -------   -------
Net loss....................................  $(4,315)  $(7,990)  $(17,076)  $(1,966)  $(7,805)
                                              =======   =======   ========   =======   =======
Net loss per share, basic and diluted.......  $ (4.83)  $ (2.63)  $  (3.30)  $ (0.46)  $ (1.12)
                                              =======   =======   ========   =======   =======
Shares used in computation, basic and
  diluted...................................      894     3,038      5,169     4,270     6,958
                                              =======   =======   ========   =======   =======
Pro forma net loss per share, basic and
  diluted (Unaudited) (Note 1)..............                      $  (0.88)            $ (0.34)
                                                                  ========             =======
Shares used in pro forma computation, basic
  and diluted (Unaudited) (Note 1)..........                        19,457              23,278
                                                                  ========             =======

- ---------------
* Amortization of deferred stock
  compensation:
  Cost of revenue...........................  $    --   $     2   $    152   $     8   $   154
  Research and development..................       36        78      1,098        58     1,160
  Selling, general and administrative.......       43        74      3,465        51     2,339
                                              -------   -------   --------   -------   -------
                                              $    79   $   154   $  4,715   $   117   $ 3,653
                                              =======   =======   ========   =======   =======
</TABLE>

                See notes to consolidated financial statements.
                                       F-4
<PAGE>   75

                            VINA TECHNOLOGIES, INC.

                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)
<TABLE>
<CAPTION>
                                    CONVERTIBLE
                                  PREFERRED STOCK          COMMON STOCK                        DEFERRED
                                --------------------   --------------------   SUBSCRIPTION      STOCK       ACCUMULATED
                                  SHARES     AMOUNT      SHARES     AMOUNT     RECEIVABLE    COMPENSATION     DEFICIT
                                ----------   -------   ----------   -------   ------------   ------------   -----------
<S>                             <C>          <C>       <C>          <C>       <C>            <C>            <C>
Balances, January 1, 1997.....   9,500,000   $ 5,732    5,883,200   $    16       $ --         $     --      $   (831)
Exercise of stock options.....          --        --      417,000        52         --               --            --
Repurchase of common
 stock........................          --        --     (126,750)       --         --               --            --
Sale of Series B convertible
 preferred stock..............   1,000,000     2,500           --        --         --               --            --
Deferred stock compensation...          --        --           --       200         --             (200)           --
Amortization of deferred stock
 compensation.................          --        --           --        --         --               79            --
Net loss and comprehensive
 loss.........................          --        --           --        --         --               --        (4,315)
                                ----------   -------   ----------   -------       ----         --------      --------
Balances, December 31, 1997...  10,500,000     8,232    6,173,450       268         --             (121)       (5,146)
Exercise of stock options.....          --        --      608,468       187         --               --            --
Repurchase of common stock....          --        --     (100,000)      (12)        --               --            --
Sale of Series C convertible
 preferred stock (net of
 issuance costs of $655)......   3,000,000    11,345           --        --         --               --            --
Sale of Series D convertible
 preferred stock (net of
 issuance costs of $21).......     779,771     4,657           --        --         --               --            --
Subscription receivable.......          --        --           --        --        (25)              --            --
Deferred stock compensation...          --        --           --       394         --             (394)           --
Amortization of deferred stock
 compensation.................          --        --           --        --         --              154            --
Net loss and comprehensive
 loss.........................          --        --           --        --         --               --        (7,990)
                                ----------   -------   ----------   -------       ----         --------      --------
Balances, December 31, 1998...  14,279,771    24,234    6,681,918       837        (25)            (361)      (13,136)
Exercise of stock options.....          --        --    1,608,497       608         --               --            --
Repurchase of common stock....          --        --     (344,334)      (18)        --               --            --
Sale of common stock..........          --        --      800,000       480         --               --            --
Sale of Series D convertible
 preferred stock..............      10,746        65           --        --         --               --            --
Receipt of subscription
 receivable...................          --        --           --        --         25               --            --
Deferred stock compensation...          --        --           --    17,877         --          (17,877)           --
Amortization of deferred stock
 compensation.................          --        --           --        --         --            4,715            --
Net loss and comprehensive
 loss.........................          --        --           --        --         --               --       (17,076)
                                ----------   -------   ----------   -------       ----         --------      --------
Balances, December 31, 1999...  14,290,517    24,299    8,746,081    19,784         --          (13,523)      (30,212)
Exercise of stock options*....          --        --    1,584,766       894         --               --            --
Repurchase of common stock*...          --        --     (163,752)      (70)        --               --            --
Sale of Series E convertible
 preferred stock (net of
 issuance costs of $8)*.......   3,404,140    23,821           --        --         --               --            --
Deferred stock
 compensation*................          --        --           --    17,089         --          (17,089)           --
Amortization of deferred stock
 compensation*................          --        --           --        --         --            3,653            --
Net loss and comprehensive
 loss*........................          --        --           --        --         --               --        (7,805)
                                ----------   -------   ----------   -------       ----         --------      --------
Balances, March 31, 2000*.....  17,694,657   $48,120   10,167,095   $37,697       $ --         $(26,959)     $(38,017)
                                ==========   =======   ==========   =======       ====         ========      ========

<CAPTION>

                                    TOTAL
                                SHAREHOLDERS'
                                   EQUITY
                                -------------
<S>                             <C>
Balances, January 1, 1997.....    $  4,917
Exercise of stock options.....          52
Repurchase of common
 stock........................          --
Sale of Series B convertible
 preferred stock..............       2,500
Deferred stock compensation...          --
Amortization of deferred stock
 compensation.................          79
Net loss and comprehensive
 loss.........................      (4,315)
                                  --------
Balances, December 31, 1997...       3,233
Exercise of stock options.....         187
Repurchase of common stock....         (12)
Sale of Series C convertible
 preferred stock (net of
 issuance costs of $655)......      11,345
Sale of Series D convertible
 preferred stock (net of
 issuance costs of $21).......       4,657
Subscription receivable.......         (25)
Deferred stock compensation...          --
Amortization of deferred stock
 compensation.................         154
Net loss and comprehensive
 loss.........................      (7,990)
                                  --------
Balances, December 31, 1998...      11,549
Exercise of stock options.....         608
Repurchase of common stock....         (18)
Sale of common stock..........         480
Sale of Series D convertible
 preferred stock..............          65
Receipt of subscription
 receivable...................          25
Deferred stock compensation...          --
Amortization of deferred stock
 compensation.................       4,715
Net loss and comprehensive
 loss.........................     (17,076)
                                  --------
Balances, December 31, 1999...         348
Exercise of stock options*....         894
Repurchase of common stock*...         (70)
Sale of Series E convertible
 preferred stock (net of
 issuance costs of $8)*.......      23,821
Deferred stock
 compensation*................          --
Amortization of deferred stock
 compensation*................       3,653
Net loss and comprehensive
 loss*........................      (7,805)
                                  --------
Balances, March 31, 2000*.....    $ 20,841
                                  ========
</TABLE>

- ---------------
* Unaudited

                See notes to consolidated financial statements.
                                       F-5
<PAGE>   76

                            VINA TECHNOLOGIES, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                   THREE MONTHS
                                                                  YEARS ENDED DECEMBER 31,        ENDED MARCH 31,
                                                              --------------------------------   -----------------
                                                               1997        1998         1999      1999      2000
                                                              -------   -----------   --------   -------   -------
                                                                                                    (UNAUDITED)
<S>                                                           <C>       <C>           <C>        <C>       <C>
Cash flows from operating activities:
  Net loss..................................................  $(4,315)    $(7,990)    $(17,076)  $(1,966)  $(7,805)
  Reconciliation of net loss to net cash used in operating
    activities:
    Depreciation and amortization...........................      151         299          640       125       204
    Amortization of deferred stock compensation.............       79         154        4,715       117     3,653
    Changes in operating assets and liabilities:
      Accounts receivable...................................      (25)     (1,592)        (852)      406      (743)
      Inventories...........................................      (83)        126          (88)       (3)        6
      Prepaid expenses and other............................      (75)       (243)         160       176      (139)
      Other assets..........................................      (40)        (42)          70        --      (100)
      Accounts payable......................................      286         458        2,657        60      (218)
      Accrued compensation and related benefits.............      133         303          441        82        32
      Accrued warranty......................................       18         135          297       165        34
      Other current liabilities.............................       73         313          (26)     (293)       82
                                                              -------     -------     --------   -------   -------
        Net cash used in operating activities...............   (3,798)     (8,079)      (9,062)   (1,131)   (4,994)
                                                              -------     -------     --------   -------   -------
Cash flows from investing activities:
  Purchases of property and equipment.......................     (645)       (666)        (938)     (178)     (532)
  Purchases of short-term investments.......................       --      (6,004)      (3,994)   (4,997)  (12,642)
  Proceeds from sales and maturities of short-term
    investments.............................................       --       2,000        7,998     3,000        --
                                                              -------     -------     --------   -------   -------
        Net cash provided by (used in) investing
          activities........................................     (645)     (4,670)       3,066    (2,175)  (13,174)
                                                              -------     -------     --------   -------   -------
Cash flows from financing activities:
  Net proceeds from sale of convertible preferred stock.....    2,500      15,977           90        25    23,821
  Proceeds from sale of common stock........................       --          --          480        --        --
  Proceeds from exercise of stock options...................       52         187          608        56       894
  Repurchase of common stock................................       --         (12)         (18)       --       (70)
  Proceeds from issuance of long-term debt..................      467         666          464       298        --
  Repayments of long-term debt..............................      (82)       (257)        (415)      (98)     (130)
                                                              -------     -------     --------   -------   -------
        Net cash provided by financing activities...........    2,937      16,561        1,209       281    24,515
                                                              -------     -------     --------   -------   -------
Net change in cash and cash equivalents.....................   (1,506)      3,812       (4,787)   (3,025)    6,347
Cash and cash equivalents, beginning of period..............    5,049       3,543        7,355     7,355     2,568
                                                              -------     -------     --------   -------   -------
Cash and cash equivalents, end of period....................  $ 3,543     $ 7,355     $  2,568   $ 4,330   $ 8,915
                                                              =======     =======     ========   =======   =======
Supplemental cash flow information:
  Cash paid for interest....................................  $    35     $    78     $    103   $    23   $    24
                                                              =======     =======     ========   =======   =======
</TABLE>

                See notes to consolidated financial statements.
                                       F-6
<PAGE>   77

                            VINA TECHNOLOGIES, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

1. BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

     Business -- VINA Technologies, Inc. (the Company), incorporated in June
1996, designs, develops, markets and sells multiservice broadband access
communications equipment that enables communications service providers to
deliver bundled voice and data services. The Company has incurred significant
losses since inception and expects that net losses and negative cash flows from
operations will continue for the forseeable future.

     Basis of Presentation -- The consolidated financial statements include the
accounts of VINA Technologies, Inc. and its wholly-owned subsidiary in the
United Kingdom. All significant intercompany accounts and transactions have been
eliminated in consolidation.

     Use of Estimates -- The preparation of financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates.

     Reclassifications -- Certain prior year amounts in the accompanying
consolidated financial statements have been reclassified to conform to current
year presentation. These reclassifications had no effect on the consolidated
financial position, results of operations or cash flows for any of the periods
presented.

     Certain Significant Risks and Uncertainties -- Financial instruments which
potentially subject the Company to concentrations of credit risk consist
primarily of cash equivalents, short-term investments and accounts receivable.
The Company only invests its cash in highly liquid and high investment grade
instruments. The Company sells its products to distributors and end users
primarily in the United States and generally does not require its customers to
provide collateral or other security to support accounts receivable. To reduce
credit risk, management performs ongoing credit evaluations of its customers'
financial condition and maintains allowances for estimated potential bad debt
losses.

     The Company participates in a dynamic high technology industry and believes
that changes in any of the following areas could have a material adverse effect
on the Company's future financial position, results of operations or cash flows:
advances and trends in new technologies and industry standards; competitive
pressures in the form of new products or price reductions on current products;
changes in the overall demand for products offered by the Company; changes in
certain strategic relationships or customer relationships; litigation or claims
against the Company based on intellectual property, patent, product, regulatory
or other factors; risk associated with changes in domestic and international
economic and/or political conditions or regulations; availability of necessary
product components; and the Company's ability to attract and retain employees
necessary to support its growth.

     Certain components and subassemblies used in the Company's products are
purchased from a sole supplier or a limited group of suppliers. In addition, the
Company outsources the production and manufacture of its access integration
devices to a sole turnkey manufacturer. Any manufacturing disruption, shortage
of supply of products or components, or the inability of the Company to procure
products or components from alternative sources on acceptable terms could have a
material adverse effect on the Company's business, financial condition and
results of operations.

     Cash Equivalents -- The Company classifies all highly liquid debt
instruments with maturities at the date of purchase of three months or less as
cash equivalents.

     Short-Term Investments -- Short-term investments consist of various
instruments with investment grade credit ratings. All of the Company's
short-term investments are classified as "available-for-sale"
                                       F-7
<PAGE>   78
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

based on the Company's intended use and are stated at amortized cost (specific
identification basis), which approximates fair value.

     At December 31, 1998, short-term investments consist of certificates of
deposit of $1,001,000, corporate debt obligations of $2,002,000 and U.S.
government obligations of $1,001,000. Available-for-sale securities are
classified as current assets as all maturities are within one year. At March 31,
2000, short-term investments consist of investments in commercial paper with
maturities within one year.

     Fair Value of Financial Instruments -- The Company's financial instruments
include cash equivalents, short-term investments and long-term debt. Cash
equivalents and short-term investments are stated at cost which approximates
fair market value based on quoted market prices. The recorded carrying amount of
the Company's long-term debt approximates fair value since such debt instruments
bear interest at approximately market rates.

     Inventories -- Inventories are stated at the lower of cost (first-in,
first-out method) or market.

     Property and Equipment -- Property and equipment are stated at cost less
accumulated depreciation and amortization. Depreciation is computed using the
straight-line method over estimated useful lives of three to five years.
Amortization of leasehold improvements is computed over the shorter of the lease
term or the estimated useful lives of the related assets.

     Long-Lived Assets -- The Company evaluates long-lived assets for impairment
whenever events or changes in circumstances indicate that the carrying amount of
an asset may not be recoverable. An impairment loss would be recognized when the
sum of the undiscounted future net cash flows expected to result from the use of
the asset and its eventual disposition is less than its carrying amount.

     Income Taxes -- The Company accounts for income taxes under an asset and
liability approach. Deferred income taxes reflect the net tax effects of
temporary differences between the carrying amounts of assets and liabilities for
financial reporting purposes and the amounts used for income tax purposes, and
operating loss and tax credit carryforwards measured by applying currently
enacted tax laws. A valuation allowance is provided to reduce net deferred tax
assets to an amount that is more likely than not to be realized.

     Stock-Based Compensation -- The Company accounts for stock-based awards to
employees using the intrinsic value method in accordance with Accounting
Principles Board Opinion (APB) No. 25, "Accounting for Stock Issued to
Employees," and to nonemployees using the fair value method in accordance with
Statement of Financial Accounting Standards (SFAS) No. 123, "Accounting for
Stock-Based Compensation."

     Revenue Recognition -- Revenues are recognized when persuasive evidence of
an arrangement exists, delivery has occurred or services have been rendered, the
price is fixed and determinable and collectibility is reasonably assured. For
sales to both distributors and end users, this generally occurs at the time of
shipment. For certain sales to distributors with collection dependent on resale,
revenue recognition occurs upon resale to end users. A provision for estimated
sales returns and warranty costs is recorded at the time the product revenue is
recognized.

     For software upgrade sales, the Company also applies Statement of Position
(SOP) 97-2, "Software Revenue Recognition," as amended, which requires, among
other things, revenue earned on software arrangements involving multiple
elements to be allocated to each element based on the relative fair values of
the elements.

                                       F-8
<PAGE>   79
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

     Research and Development -- Costs incurred in research and development are
charged to operations as incurred.

     Foreign Currency -- The functional currency of the Company's foreign
subsidiary is the U.S. dollar. Transaction and remeasurement gains and losses
were not significant for any of the periods presented.

     Net Loss per Share -- Basic earnings per share (EPS) excludes dilution and
is computed by dividing net income (loss) attributable to common shareholders by
the weighted average number of common shares outstanding for the period
excluding the weighted average common shares subject to repurchase. Diluted EPS
reflects the potential dilution that could occur if securities or other
contracts to issue common stock (convertible preferred stock and common stock
options using the treasury stock method) were exercised or converted into common
stock. Potential common shares in the diluted EPS computation are excluded in
net loss periods as their effect would be antidilutive.

     Unaudited Pro Forma Net Loss per Share -- Pro forma net loss per share,
basic and diluted, is computed by dividing net loss attributable to common
shareholders by the weighted average number of common shares outstanding for the
period and the weighted average number of shares outstanding for the period
resulting from the assumed conversion of convertible preferred stock.

     Comprehensive Loss -- In accordance with SFAS No. 130, "Reporting
Comprehensive Income," the Company reports by major components and as a single
total, the change in its net assets during the period from nonowner sources.
Comprehensive loss for the years ended December 31, 1997, 1998 and 1999 and for
the three months ended March 31, 1999 and 2000 was the same as net loss.

     Unaudited Pro Forma Information -- The unaudited pro forma information in
the accompanying consolidated balance sheet assumes that the conversion of the
outstanding shares of convertible preferred stock into 17,694,657 shares of
common stock resulting from the completion of an initial public offering had
actually occurred on March 31, 2000. Common shares issued resulting from such an
initial public offering and its related estimated net proceeds are excluded from
such pro forma information.

     Unaudited Interim Financial Information -- The interim financial
information as of March 31, 2000 and for the three months ended March 31, 1999
and 2000 is unaudited and has been prepared on the same basis as the audited
consolidated financial statements. In the opinion of management, such unaudited
information includes all adjustments (consisting only of normal recurring
adjustments) necessary for a fair presentation of the interim information.
Operating results for the three months ended March 31, 2000 are not necessarily
indicative of the results that may be expected for the year ending December 31,
2000.

     New Accounting Standard -- In June 1998, the Financial Accounting Standards
Board issued SFAS No. 133, "Accounting for Derivative Instruments and Hedging
Activities." This statement requires companies to record derivatives on the
balance sheet as assets or liabilities, measured at fair value. Gains or losses
resulting from changes in the values of those derivatives would be accounted for
depending on the use of the derivative and whether it qualifies for hedge
accounting. SFAS No. 133, as amended, will be effective for the Company
beginning in 2001. Although the Company has not fully assessed the implications
of SFAS No. 133, management does not believe adoption of this statement will
have a material impact on the Company's financial position, results of
operations or cash flows.

                                       F-9
<PAGE>   80
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

2. INVENTORIES

     Inventories consist of the following:

<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                              ------------    MARCH 31,
                                                              1998    1999      2000
                                                              ----    ----    ---------
                                                                   (IN THOUSANDS)
<S>                                                           <C>     <C>     <C>
Raw materials and subassemblies.............................  $--     $48        $48
Finished goods..............................................    8      48         42
                                                              ---     ---        ---
Inventories.................................................  $ 8     $96        $90
                                                              ===     ===        ===
</TABLE>

3. PROPERTY AND EQUIPMENT

     Property and equipment consists of the following:

<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                              -----------------
                                                               1998      1999
                                                              ------    -------
                                                               (IN THOUSANDS)
<S>                                                           <C>       <C>
Computer equipment and software.............................  $  585    $   915
Machinery and equipment.....................................     792      1,227
Furniture and fixtures......................................      90        180
Leasehold improvements......................................      58        115
                                                              ------    -------
                                                               1,525      2,437
Accumulated depreciation and amortization...................    (467)    (1,081)
                                                              ------    -------
Property and equipment, net.................................  $1,058    $ 1,356
                                                              ======    =======
</TABLE>

4. LONG-TERM DEBT

     Long-term debt consists of the following:

<TABLE>
<CAPTION>
                                                                DECEMBER 31,
                                                              ----------------
                                                               1998      1999
                                                              ------    ------
                                                               (IN THOUSANDS)
<S>                                                           <C>       <C>
Capital expenditure term loan due April 1999................  $   41    $   --
Capital expenditure term loan due June 2001.................     669       401
1998 capital expenditure facility...........................     295       653
                                                              ------    ------
Total debt..................................................   1,005     1,054
Current portion of long-term debt...........................    (350)     (520)
                                                              ------    ------
Long-term debt..............................................  $  655    $  534
                                                              ======    ======
</TABLE>

     Borrowings under the capital expenditure term loans were utilized to
finance purchases of capital equipment. The outstanding balance on the term loan
due in April 1999 was paid in its entirety during 1999. The 36-month term loan
due in June 2001 is to be repaid in equal monthly principal installments of
$22,000 plus accrued interest at prime (8.5% at December 31, 1999) plus 1%. The
outstanding borrowings under this term loan are secured by substantially all
assets of the Company.

     Under the 1998 capital expenditure facility, borrowings are to be repaid in
36 equal monthly principal installments of $21,000 plus accrued interest at
prime plus 0.75%. Outstanding borrowings under this term loan are secured by
substantially all assets of the Company.

                                      F-10
<PAGE>   81
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

     In 1999, the Company entered into another capital expenditure facility.
Under the arrangement, the Company can borrow up to $1,000,000 on a
non-revolving line of credit to finance purchases of capital equipment. The
borrowing period extends through September 17, 2000. During the borrowing
period, no principal amounts are due and interest at prime plus 1% is payable
monthly. At the end of the borrowing period, any outstanding balances will
automatically be converted into a 36-month term loan payable in equal monthly
principal installments plus interest at prime plus 1%. Outstanding borrowings
under this facility would be secured by substantially all assets of the Company.
As of December 31, 1999, no borrowings have been made under this facility.

     Outstanding borrowings under the Company's debt arrangements are subject to
certain financial covenant requirements which include a minimum tangible net
worth, maximum debt to tangible net worth ratio, minimum quick ratio and minimum
cash balance to debt service coverage ratio. The Company received a waiver of
compliance requirements from its lender as of December 31, 1999 and through
March 31, 2000. Accordingly, at December 31, 1999, the outstanding borrowings
were classified as current or long-term in the accompanying consolidated balance
sheet based on their scheduled maturity dates.

     Future annual maturities of debt obligations outstanding at December 31,
1999 are as follows (in thousands):

<TABLE>
<S>                                                           <C>
2000........................................................  $  520
2001........................................................     387
2002........................................................     147
                                                              ------
          Total debt........................................  $1,054
                                                              ======
</TABLE>

5. COMMITMENTS

     The Company leases its primary facilities under a noncancelable operating
lease which expires in July 2000. Rent expense was $130,000, $298,000 and
$302,000 for the years ended December 31, 1997, 1998 and 1999, respectively.
Future annual minimum lease payments are $133,000 for 2000.

6. SHAREHOLDERS' EQUITY

  Convertible Preferred Stock

     In 1997, the Company issued 1,000,000 shares of Series B convertible
preferred stock at $2.50 per share resulting in proceeds of $2,500,000.

     In 1998, the Company issued 3,000,000 shares of Series C convertible
preferred stock at $4.00 per share resulting in net proceeds of $11,345,000 and
775,604 shares of Series D convertible preferred stock at $6.00 per share
resulting in net proceeds of $4,632,000. The Company issued an additional 4,167
shares of Series D convertible preferred stock at $6.00 per share, for which the
proceeds were not payable until 1999, and accordingly, the Company established a
$25,000 subscription receivable at December 31, 1998.

     In 1999, the Company issued an additional 10,746 shares of Series D
convertible preferred stock at $6.00 per share resulting in proceeds of $65,000.

     From January 2000 through March 6, 2000, the Company issued 3,404,140
shares of Series E convertible preferred stock at $7.00 per share resulting in
net proceeds of $23,821,000.

                                      F-11
<PAGE>   82
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

     Significant terms of the convertible preferred stock are as follows:

     - Annual noncumulative cash dividends of $0.008, $0.20, $0.32, $0.48 and
       $0.56 per share of Series A, Series B, Series C, Series D and Series E,
       respectively, must be paid prior to any dividend on the common stock, if
       and when declared by the Board of Directors.

     - In the event of any liquidation, dissolution or winding up of the
       Company, the holders of Series A, Series B, Series C, Series D and Series
       E shall receive, prior to any distributions to holders of common stock,
       $0.10, $2.50, $4.00, $6.00 and $7.00 per share for Series A, Series B,
       Series C, Series D and Series E, respectively, plus any declared but
       unpaid dividends.

     - Each share of convertible preferred stock is convertible into one share
       of common stock, subject to adjustments for events of dilution, at the
       option of the holder any time after the date of issuance. In addition,
       each share of convertible preferred stock will automatically be converted
       into common stock either (i) upon the completion of a public offering of
       common stock with aggregate proceeds greater than $7,500,000 and at a
       price per share not less than $7.00 per share or (ii) at such time as the
       holders of more than 50% of all of the convertible preferred stock,
       voting as a single class, consent to the conversion of all shares.

     - Each share has the right to vote equal to the number of shares of common
       stock into which it is convertible.

  Common Stock

     Common stock issued under certain stock purchase agreements and stock
option plan exercises is subject to repurchase by the Company. The number of
shares subject to repurchase is generally reduced over a four-year vesting
period. At December 31, 1998 and 1999 and March 31, 2000, 2,724,157, 2,320,548
and 2,822,994 shares were subject to repurchase, respectively.

  Net Loss Per Share

     The following is a calculation of the denominators used for the basic and
diluted net loss per share computations:

<TABLE>
<CAPTION>
                                                                            THREE MONTHS
                                                YEARS ENDED DECEMBER 31,   ENDED MARCH 31,
                                                ------------------------   ---------------
                                                 1997     1998     1999     1999     2000
                                                ------   ------   ------   ------   ------
                                                              (IN THOUSANDS)
<S>                                             <C>      <C>      <C>      <C>      <C>
Weighted average common shares outstanding....   6,067    6,417    7,728    6,905    9,583
Weighted average common shares outstanding
  subject to repurchase.......................  (5,173)  (3,379)  (2,559)  (2,635)  (2,625)
                                                ------   ------   ------   ------   ------
  Shares used in computation, basic and
     diluted..................................     894    3,038    5,169    4,270    6,958
                                                ======   ======   ======   ======   ======
</TABLE>

     During all periods presented, the Company had securities outstanding which
could potentially dilute basic EPS in the future, but were excluded in the
computation of diluted EPS in such periods, as their effect would have been
antidilutive due to the net loss reported in such periods. Such outstanding
securities consist of the following at: December 31, 1997, 10,500,000 shares of
convertible preferred stock, 4,039,638 shares of common stock subject to
repurchase and options to purchase 2,101,400 shares of common stock; December
31, 1998, 14,279,771 shares of convertible preferred stock, 2,724,157 shares of
common stock subject to repurchase and options to purchase 5,191,511 shares of
common stock; December 31, 1999, 14,290,517 shares of convertible preferred
stock, 2,320,548 shares of common stock

                                      F-12
<PAGE>   83
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

subject to repurchase and options to purchase 7,540,482 shares of common stock;
March 31, 1999, 14,279,771 shares of convertible preferred stock, 2,466,594
shares of common stock subject to repurchase and options to purchase 4,963,531
shares of common stock; March 31, 2000, 17,694,657 shares of convertible
preferred stock, 2,822,994 shares of common stock subject to repurchase and
options to purchase 8,481,471 shares of common stock.

  Stock Plans

     Under the Company's stock plans adopted in 1996 and 1998, the Company may
grant options to purchase or directly issue up to 14,116,800 shares of common
stock to employees, directors and consultants at prices not less than the fair
market value (as determined by the Board of Directors) at the date of grant for
incentive stock options and not less than 85% of fair market value at the date
of grant for nonstatutory stock options. These options generally expire ten
years from the date of grant and are immediately exercisable. The Company has a
right to repurchase (at the option exercise price) common stock issued under
option exercises for unvested shares. The right of repurchase generally expires
25% after the first 12 months from the date of grant and then ratably over a
36-month period.

     The Board of Directors in their determination of fair market value on the
date of grant takes into consideration many factors including, but not limited
to, the Company's financial performance, current economic trends, actions by
competitors, market maturity, emerging technologies, near-term backlog and, in
certain circumstances, valuation analyses performed by independent appraisers.
These valuation analyses utilize generally accepted valuation methodologies such
as the income and market approaches to valuing the Company's business.

                                      F-13
<PAGE>   84
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

     Stock option activity under the stock plans is summarized as follows:

<TABLE>
<CAPTION>
                                                                      OUTSTANDING OPTIONS
                                                                     ---------------------
                                                                                  WEIGHTED
                                                        SHARES                    AVERAGE
                                                     AVAILABLE FOR   NUMBER OF    EXERCISE
                                                         GRANT         SHARES      PRICE
                                                     -------------   ----------   --------
<S>                                                  <C>             <C>          <C>
Balances, January 1, 1997..........................           --             --    $  --
Reserved...........................................    4,616,800             --       --
Granted (weighted average fair value of $0.11 per
  share)...........................................   (2,614,900)     2,614,900     0.18
Canceled...........................................       96,500        (96,500)    0.13
Exercised..........................................           --       (417,000)    0.13
                                                      ----------     ----------
Balances at December 31, 1997 (1,584 shares vested
  at a weighted average exercise price of $0.13 per
  share)...........................................    2,098,400      2,101,400     0.19
Reserved...........................................    3,000,000             --       --
Granted (weighted average fair value of $0.17 per
  share)...........................................   (3,989,579)     3,989,579     0.41
Canceled...........................................      291,000       (291,000)    0.33
Repurchased........................................      100,000             --       --
Exercised..........................................           --       (608,468)    0.31
                                                      ----------     ----------
Balances at December 31, 1998 (666,807 shares
  vested at a weighted average exercise price of
  $0.19 per share).................................    1,499,821      5,191,511     0.34
Reserved...........................................    3,000,000             --       --
Granted (weighted average fair value of $3.58 per
  share)...........................................   (4,411,500)     4,411,500     0.88
Canceled...........................................      454,032       (454,032)    0.42
Repurchased........................................       71,625             --       --
Exercised..........................................           --     (1,608,497)    0.38
                                                      ----------     ----------
Balances at December 31, 1999......................      613,978      7,540,482     0.64
Reserved...........................................    3,500,000             --       --
Granted............................................   (2,830,760)     2,830,760     1.19
Canceled...........................................      305,005       (305,005)    0.38
Repurchased........................................       99,585             --       --
Exercised..........................................           --     (1,584,766)    0.56
                                                      ----------     ----------
Balances, March 31, 2000...........................    1,687,808      8,481,471    $0.84
                                                      ==========     ==========
</TABLE>

     Additional information regarding options outstanding at December 31, 1999
is as follows:

<TABLE>
<CAPTION>
                           OPTIONS OUTSTANDING               VESTED OPTIONS
                  -------------------------------------   --------------------
                                  WEIGHTED
                                  AVERAGE      WEIGHTED               WEIGHTED
                                 REMAINING     AVERAGE                AVERAGE
                    NUMBER      CONTRACTUAL    EXERCISE    NUMBER     EXERCISE
EXERCISE PRICES   OUTSTANDING   LIFE (YEARS)    PRICE      VESTED      PRICE
- ---------------   -----------   ------------   --------   ---------   --------
<S>               <C>           <C>            <C>        <C>         <C>
    $0.13            491,400        7.4         $0.13       268,417    $0.13
    $0.25          1,276,250        8.1          0.25       379,042     0.25
    $0.40            971,091        8.5          0.40       277,230     0.40
    $0.60          1,854,791        9.2          0.60       229,719     0.60
    $1.00          2,946,950        9.7          1.00         9,000     1.00
                   ---------                              ---------
$0.13 - $1.00      7,540,482        9.0         $0.64     1,163,408    $0.33
                   =========                              =========
</TABLE>

                                      F-14
<PAGE>   85
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

  Deferred Stock Compensation

     As discussed in Note 1, the Company accounts for its stock-based awards to
employees using the intrinsic value method in accordance with APB No. 25.
Accordingly, the Company records deferred stock compensation equal to the
difference between the grant price and deemed fair value of the Company's common
stock on the date of grant. Such deferred stock compensation expense aggregated
$200,000, $394,000, $15,114,000 and $17,089,000 in 1997, 1998, 1999 and the
three months ended March 31, 2000, respectively, and is being amortized to
expense over the vesting period of the options, generally four years, using a
multiple option award valuation approach.

     In 1999, the Company issued 800,000 shares of common stock to a director at
$0.60 per share resulting in proceeds of $480,000. The Company has a right of
repurchase on such shares at the original issuance price upon termination of
employment. The right of repurchase expires over four years with certain
predefined events triggering accelerated vesting. The Company recorded
$2,664,000 of deferred stock compensation equal to the difference between the
purchase price and deemed fair value of the Company's common stock on the date
of issuance. Such deferred stock compensation is amortized to expense over the
vesting period using a multiple award option valuation approach.

     During 1998, the Company issued nonstatutory options to nonemployees for
the purchase of 104,958 shares of common stock at a weighted average exercise
price of $0.40 per share. The fair value of such awards was not significant, and
such shares are fully vested as of December 31, 1999.

     During 1999, the Company issued nonstatutory options to nonemployees for
the purchase of 23,000 shares of common stock at a weighted average exercise
price of $0.84 per share. Such options were issued for services provided by the
nonemployees and were immediately vested and exercisable. Accordingly, the
Company recorded the $99,000 fair value of such awards (using the Black-Scholes
option pricing model) as deferred stock compensation which was expensed on the
date of grant.

  Additional Stock Plan Information

     Since the Company continues to account for its stock-based awards to
employees using the intrinsic value method in accordance with APB No. 25, SFAS
No. 123 requires the disclosure of pro forma net income (loss) had the Company
adopted the fair value method. Under SFAS No. 123, the fair value of stock-based
awards is calculated through the use of option pricing models, even though such
models were developed to estimate the fair value of freely tradable, fully
transferable options without vesting restrictions, which significantly differ
from the Company's stock option awards. The Company's calculations were made
using the minimum value pricing model which requires subjective assumptions,
including expected time to exercise, which greatly affects the calculated
values. The following weighted average assumptions were used in the model for
1997, 1998 and 1999: expected life, 3.2 years for 1997, 3.4 years for 1998, 3.1
years for 1999; risk free interest rate, 7% for 1997 and 6% for 1998 and 1999;
and no dividends during the expected term. The Company's calculations are based
on a multiple option award valuation approach, and forfeitures are recognized as
they occur. If the computed fair values of the employee awards had been
amortized to expense over the vesting period of the awards, the Company's pro
forma net loss would have been $4,328,000 ($4.84 per share, basic and diluted)
in 1997, $8,083,000 ($2.66 per share, basic and diluted) in 1998 and $17,365,000
($3.36 per share, basic and diluted) in 1999.

  Rescission Offer

     The issuance of common shares and common stock options granted under the
1996 stock plan may have violated California securities laws because these
issuances and grants may not have been exempt

                                      F-15
<PAGE>   86
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

from qualification under those securities laws. In order to eliminate any
potential liability, the Company intends to make a rescission offer to
repurchase 2,632,000 outstanding common shares and common stock options for an
aggregate of approximately $350,000. The rescission offer will be held open for
30 days and will include statutory interest of 7% per year.

7. INCOME TAXES

     No income taxes were provided for any of the periods presented due to the
Company's significant net loss position.

     The components of net deferred tax assets are as follows:

<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              -------------------
                                                               1998        1999
                                                              -------    --------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Deferred tax assets:
  Accruals and reserves not currently deductible............  $   243    $    478
  Net operating loss carryforwards..........................    4,864       9,103
  Tax credit carryforwards..................................      488       1,138
                                                              -------    --------
                                                                5,595      10,719
Valuation allowance.........................................   (5,595)    (10,719)
                                                              -------    --------
Total net deferred tax assets...............................  $    --    $     --
                                                              =======    ========
</TABLE>

     The net $5,124,000 increase in the valuation allowance in 1999 was
primarily the result of increased net operating losses and tax credit
carryforwards generated during the year which the Company provided a full
valuation against based on the Company's evaluation of the likelihood of
realization of future tax benefits resulting from deferred tax assets.

     As of December 31, 1999, the Company had available for carryforward net
operating losses for federal and state income tax purposes of $23,992,000 and
$16,219,000, respectively. Federal net operating loss carryforwards will expire,
if not utilized, in 2011 through 2019. State net operating loss carryforwards
will expire, if not utilized, in 2003 through 2005.

     As of December 31, 1999, the Company had available for carryforward
research and experimentation tax credits for federal and state income tax
purposes of $581,000 and $434,000, respectively. Federal research and
experimentation tax credit carryforwards expire in 2011 through 2019. The
Company also had $123,000 in California manufacturers investment credits.

     Current federal and California tax laws include substantial restrictions on
the utilization of net operating losses and tax credits in the event of an
"ownership change" of a corporation. Accordingly, the Company's ability to
utilize net operating loss and tax credit carryforwards may be limited as a
result of such ownership change. Such a limitation could result in the
expiration of carryforwards before they are utilized.

                                      F-16
<PAGE>   87
                            VINA TECHNOLOGIES, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
                YEARS ENDED DECEMBER 31, 1997, 1998 AND 1999 AND
       THREE MONTHS ENDED MARCH 31, 1999 (UNAUDITED) AND 2000 (UNAUDITED)

 8. CUSTOMER CONCENTRATIONS

     The following table summarizes net revenues and accounts receivable for
customers which accounted for 10% or more of net revenues or accounts
receivable:

<TABLE>
<CAPTION>
                                                                    NET REVENUES
                          ACCOUNTS RECEIVABLE       ---------------------------------------------
                       -------------------------                                   THREE MONTHS
                       DECEMBER 31,                 YEARS ENDED DECEMBER 31,     ENDED MARCH 31,
                       ------------    MARCH 31,    -------------------------    ----------------
      CUSTOMER         1998    1999      2000       1997      1998      1999     1999       2000
      --------         ----    ----    ---------    -----     -----     -----    -----      -----
<S>                    <C>     <C>     <C>          <C>       <C>       <C>      <C>        <C>
A....................   39%     --        --         61%       57%       --       32%        --
B....................   34%     43%       26%        --        17%       46%      43%        28%
C....................   --      --        --         33%       --        --       --         --
D....................   --      33%       14%        --        --        --       --         12%
E....................   --      12%       --         --        --        --       --         --
F....................   --      --        14%        --        --        --       --         12%
G....................   --      --        13%        --        --        --       --         15%
H....................   --      --        20%        --        --        --       --         15%
I....................   --      --        --         --        --        --       12%        --
</TABLE>

 9. EMPLOYEE BENEFIT PLAN

     During 1997 and 1998, the Company sponsored a simple individual retirement
account plan (SEP IRA) and made discretionary contributions of $12,000 and
$39,000, respectively. The SEP IRA plan was replaced, effective January 1, 1999,
with a 401(k) tax deferred savings plan (401(k) plan) to provide for retirement
of employees meeting certain eligibility requirements. Employee contributions
are limited to 20% of their annual compensation subject to IRS annual
limitations. The Company may make contributions at the discretion of the Board
of Directors. There were no discretionary employer contributions to the 401(k)
plan in 1999.

10. SEGMENT INFORMATION

     As defined by the requirements of SFAS No. 131, "Disclosures About Segments
of an Enterprise and Related Information," the Company operates in one
reportable segment: the design, development, marketing and sale of multiservice
broadband access communications equipment. International sales were
insignificant for all periods presented.

                                      F-17
<PAGE>   88
[Edgar description of inside front cover artwork: In the upper left part of the
page is the VINA logo and the words "VINA Technologies Simplifying the First
Mile." In the middle of the page is the phrase "Helping Communications Service
Providers Become Successful," below which is the phrase in smaller fontsize
"SOLUTIONS FOR BROADBAND ACCESS." The background on the top part of the page
shows a blueprint and a telephone. The names and logos of several customers
appear at the bottom of the page.]

[Edgar description of gatefold artwork: Across the top and left side of the
artwork is the phrase "Architects of Broadband Access Solutions," below which is
a diagram. On the left side of the diagram are the words "VINA DELVERS,"
"VOICE," "INTERNET," "DATA" and "VIDEO," each followed by a textual description.
To the right of these words is a column of pictures of a telephone, video
recorder, personal computer and PBX. To the right of these pictures is a single
line connected to a column of four pictures of VINA's products (Multiservice
Xchange, T1 Integrator, HDSL Integrator and DSL eLink). To the right of these
pictures is a single line connected to a building labeled "Local Telephone
Service Provider." To the right of the building is a line connected to a cloud
labeled "Public Network," and a second line connected to a cloud labeled
"Internet."

Across the top and right side of the artwork is the phrase "Simplifying the
First Mile," below which are pictures of the Multiservice Xchange, T1
Integrator, HDSL Integrator and DSL eLink. Beside each picture is the name and a
textual description of the product.]

<PAGE>   89

                                      LOGO

                                                 Shares

                                  'VINA LOGO'
                            VINA TECHNOLOGIES, INC.
                                  Common Stock
                          ----------------------------
                                   PROSPECTUS
                                            , 2000
                          ----------------------------
                                LEHMAN BROTHERS
                           THOMAS WEISEL PARTNERS LLC
                           U.S. BANCORP PIPER JAFFRAY
<PAGE>   90

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the various expenses expected to be incurred
by the Registrant in connection with the sale and distribution of the securities
being registered hereby, other than underwriting discounts and commissions. All
amounts are estimated except the Securities and Exchange Commission registration
fee, the National Association of Securities Dealers, Inc. filing fee and the
Nasdaq National Market listing fee.

<TABLE>
<S>                                                             <C>
SEC registration fee........................................    $21,252
National Association of Securities Dealers, Inc. filing
  fee.......................................................      8,550
Nasdaq National Market listing fee..........................     95,000
Blue Sky fees and expenses..................................          *
Accounting fees and expenses................................          *
Legal fees and expenses.....................................          *
Printing and engraving expenses.............................          *
Registrar and Transfer Agent's fees.........................          *
Miscellaneous fees and expenses.............................          *
                                                                -------
     Total..................................................    $     *
                                                                =======
</TABLE>

- ---------------
* To be filed by amendment.

ITEM 14.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 145 of the Delaware General Corporation Law provides for the
indemnification of officers, directors, and other corporate agents in terms
sufficiently broad to indemnify such persons under certain circumstances for
liabilities (including reimbursement for expenses incurred) arising under the
Securities Act of 1933, as amended (the "Act"). The Registrant's Restated
Certificate of Incorporation and Registrant's Bylaws provide for indemnification
of the Registrant's directors, officers, employees and other agents to the
extent and under the circumstances permitted by the Delaware General Corporation
Law. The Registrant has also entered into agreements with our directors and
officers that will require the Registrant, among other things, to indemnify them
against certain liabilities that may arise by reason of their status or service
as directors or officers to the fullest extent not prohibited by law.

     The Underwriting Agreement provides for indemnification by the Underwriters
of the Registrant, our directors and officers, and by the Registrant of the
Underwriters, for certain liabilities, including liabilities arising under the
Act, and affords certain rights of contribution with respect thereto.

ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES

     (a) On various dates between January 1997 and March 2000, the Registrant
issued 4,218,731 shares of its common stock to 92 employees and directors
pursuant to the exercise of options granted under its 1996 and 1998 Stock Plans.
The exercise prices per share ranged from $0.125 to $1.00, for an aggregate
consideration of $1,741,728.

     (b) In March and May 1998, the Registrant issued and sold 3,000,000 shares
of Series C preferred stock to a total of 20 investors. The per share price was
$4.00, for an aggregate consideration of $12,000,000.

     (c) In October 1998 and April 1999, the Registrant issued and sold 790,517
shares of Series D preferred stock to a total of 24 investors. The per share
price was $6.00, for an aggregate consideration of $4,743,102.
                                      II-1
<PAGE>   91

     (d) In January, February and March 2000, the Registrant issued and sold
3,404,140 shares of Series E preferred stock to a total of 34 investors. The per
share price was $7.00, for an aggregate consideration of $23,828,980.

     (e) On June 1, 1999, the Registrant issued 800,000 shares of its common
stock to W. Michael West at a per share price of $.60, for an aggregate
consideration of $480,000.

     The sales of the above securities were considered to be exempt from
registration under the Securities Act in reliance on Section 4(2) of the
Securities Act, or Regulation D promulgated thereunder, or Rule 701 promulgated
under Section 3(b) of the Securities Act, as transactions by an issuer not
involving a public offering or transactions under compensatory benefit plans and
contracts relating to compensation as provided under Rule 701. The recipients of
securities in each of these transactions represented their intention to acquire
the securities for investment only and not with a view to or for sale with any
distribution thereof, and appropriate legends were affixed to the share
certificates and instruments issued in these transactions. All recipients had
adequate access, through their relationship with the Registrant, to information
about the Registrant.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     (a) Exhibits

<TABLE>
<CAPTION>
EXHIBIT
  NO.                               EXHIBIT
- --------                            -------
<S>       <C>
 1.1*     Form of Underwriting Agreement.
 3(i).1*  Amended and Restated Certificate of Incorporation of VINA
          Technologies, Inc.
 3(i).2*  Form of Amended and Restated Certificate of Incorporation of
          VINA Technologies, Inc. (proposed).
          Bylaws of VINA Technologies, Inc.
3(ii).1*
          Amended and Restated Bylaws of VINA Technologies, Inc.
3(ii).2*  (proposed).
 4.1*     Specimen Common Stock Certificate.
 4.2*     Fourth Amended and Restated Investors' Rights Agreement
          dated as of January 31, 2000.
 5.1.1*   Opinion of Pillsbury Madison & Sutro LLP.
10.1.1*   1996 Stock Plan and form of agreements thereunder.
10.1.2*   Amended and Restated 1998 Stock Plan and form of agreements
          thereunder.
10.1.3*   2000 Employee Stock Purchase Plan and form of agreements
          thereunder.
10.2*+    General Agreement for the Procurement of Products and
          Service and the Licensing of Software dated May 15, 1998
          between VINA Technologies, Inc. and Lucent Technologies,
          Inc.
10.3*+    OEM Purchase Agreement dated February 27, 1998 between VINA
          Technologies, Inc. and PainGain Technologies, Inc.
10.4*     Standard NNN Lease dated March 24, 1997 between VINA
          Technologies, Inc. and Limar Realty Corp.
10.5*     Form of Indemnification Agreement between VINA Technologies,
          Inc. and its officers and directors.
21.1*     Subsidiary
23.1      Independent Auditors' Consent.
23.2*     Consent of Pillsbury Madison & Sutro LLP (included in
          Exhibit 5.1).
24.1      Power of Attorney (included on page II-4).
27.1      Financial Data Schedules.
</TABLE>

- ---------------
* To be filed by amendment.

+ Confidential treatment requested as to certain portions of this exhibit from
  the SEC. The omitted portions have been filed separately with the SEC.
                                      II-2
<PAGE>   92

     (b) Financial Statement Schedules

     The following consolidated financial statement schedule is filed as part of
this registration statement and should be read in conjunction with the
consolidated financial statements:

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Schedule II -- Valuation & Qualifying Accounts                S-2
</TABLE>

     Schedules other than those referred to above have been omitted because they
are not applicable or not required or because the information is included
elsewhere in the consolidated financial statements or the notes thereto.

ITEM 17.  UNDERTAKINGS

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "Act"), may be permitted to directors, officers and
controlling persons of the Registrant pursuant to the foregoing provisions, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Act and is, therefore, unenforceable. In the event that a claim
for indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

     The undersigned Registrant hereby undertakes that:

     (1) For purposes of determining any liability under the Act, the
         information omitted from the form of prospectus filed as part of this
         registration statement in reliance upon Rule 430A and contained in a
         form of prospectus filed by the Registrant pursuant to Rule 424(b)(1)
         or (4) or 497(h) under the Act shall be deemed to be part of this
         registration statement as of the time it was declared effective.

     (2) For the purpose of determining any liability under the Act, each
         post-effective amendment that contains a form of prospectus shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

     (3) It will provide to the underwriters at the closing(s) specified in the
         underwriting agreement certificates in such denominations and
         registered in such names as required by the underwriters to permit
         prompt delivery to each purchaser.

                                      II-3
<PAGE>   93

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Fremont, State of
California, on the 5th day of May, 2000.

                                          VINA TECHNOLOGIES, INC.

                                          By      /s/ STEVEN M. BAUMAN
                                            ------------------------------------
                                                      STEVEN M. BAUMAN
                                               President and Chief Executive
                                                           Officer

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints Steven M. Bauman and Stanley E. Kazmierczak, and
each of them, his true and lawful attorneys-in-fact and agents, each with full
power of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities, to sign any and all amendments, including
post-effective amendments, to this Registration Statement, and any registration
statement relating to the offering covered by this Registration Statement and
filed pursuant to Rule 462(b) under the Securities Act of 1933, and to file the
same, with exhibits thereto and other documents in connection therewith, with
the Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done, as fully to all intents
and purposes as he might or could do in person, hereby ratifying and confirming
all that each of said attorneys-in-fact and agents or their substitute or
substitutes may lawfully do or cause to be done by virtue hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
                       NAME                                         TITLE                     DATE
                       ----                                         -----                     ----
<S>                                                  <C>                                   <C>
               /s/ STEVEN M. BAUMAN                  President and Chief Executive         May 5, 2000
- ---------------------------------------------------    Officer (Principal Executive
                 Steven M. Bauman                      Officer) and Director

            /s/ STANLEY E. KAZMIERCZAK               (Principal Financial and Accounting   May 5, 2000
- ---------------------------------------------------    Officer)
              Stanley E. Kazmierczak

               /s/ JEFFREY M. DRAZAN                 Director                              May 5, 2000
- ---------------------------------------------------
                 Jeffrey M. Drazan

                /s/ JOHN F. MALONE                   Director                              May 5, 2000
- ---------------------------------------------------
                  John F. Malone

               /s/ FRANK J. MARSHALL                 Director                              May 5, 2000
- ---------------------------------------------------
                 Frank J. Marshall
</TABLE>

                                      II-4
<PAGE>   94

<TABLE>
<CAPTION>
                       NAME                                         TITLE                     DATE
                       ----                                         -----                     ----
<S>                                                  <C>                                   <C>
               /s/ PHILIP J. QUIGLEY                 Director                              May 5, 2000
- ---------------------------------------------------
                 Philip J. Quigley

                /s/ JOSHUA W. SOSKE                  Director                              May 5, 2000
- ---------------------------------------------------
                  Joshua W. Soske

                /s/ W. MICHAEL WEST                  Director                              May 5, 2000
- ---------------------------------------------------
                  W. Michael West
</TABLE>

                                      II-5
<PAGE>   95

                    INDEPENDENT AUDITORS' REPORT ON SCHEDULE

To the Board of Directors and Shareholders of
VINA Technologies, Inc.:

     We have audited the consolidated balance sheets of VINA Technologies, Inc.
and its subsidiary (the Company) as of December 31, 1998 and 1999, and the
related consolidated statements of operations, shareholders' equity and cash
flows for each of the three years in the period ended December 31, 1999, and
have issued our report thereon dated March 17, 2000 (included elsewhere in this
registration statement). Our audits also included the consolidated financial
statement schedule listed in Item 16(b) of this registration statement. The
consolidated financial statement schedule is the responsibility of the Company's
management. Our responsibility is to express an opinion based on our audits. In
our opinion, such consolidated financial statement schedule, when considered in
relation to the basic consolidated financial statements taken as a whole,
presents fairly in all material respects the information set forth therein.

DELOITTE & TOUCHE LLP

San Jose, California
March 17, 2000

                                       S-1
<PAGE>   96

                            VINA TECHNOLOGIES, INC.

                                  SCHEDULE II
                       VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
                                                                           DEDUCTIONS-
                                               BALANCE AT    CHARGED TO    WRITE-OFFS
                                               BEGINNING     COSTS AND         OF          BALANCE AT
                                               OF PERIOD      EXPENSES      ACCOUNTS      END OF PERIOD
                                               ----------    ----------    -----------    -------------
<S>                                            <C>           <C>           <C>            <C>
Allowance for doubtful accounts:
Year ended
  December 31, 1999..........................     $109          $131          $ 19            $221
  December 31, 1998..........................       --           109            --             109
  December 31, 1997..........................       --            --            --               0
Accrued warranty:
Year ended
  December 31, 1999..........................     $152          $410          $113            $449
  December 31, 1998..........................       18           185            51             152
  December 31, 1997..........................       --            42            24              18
</TABLE>

                                       S-2
<PAGE>   97

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
  NO.                               EXHIBIT
- --------                            -------
<S>       <C>
 1.1*     Form of Underwriting Agreement.
 3(i).1*  Amended and Restated Certificate of Incorporation of VINA
          Technologies, Inc.
 3(i).2*  Form of Amended and Restated Certificate of Incorporation of
          VINA Technologies, Inc. (proposed).
          Bylaws of VINA Technologies, Inc.
3(ii).1*
          Amended and Restated Bylaws of VINA Technologies, Inc.
3(ii).2*  (proposed).
 4.1*     Specimen Common Stock Certificate.
 4.2*     Fourth Amended and Restated Investors' Rights Agreement
          dated as of January 31, 2000.
 5.1.1*   Opinion of Pillsbury Madison & Sutro LLP.
10.1.1*   1996 Stock Plan and form of agreements thereunder.
10.1.2*   Amended and Restated 1998 Stock Plan and form of agreements
          thereunder.
10.1.3*   2000 Employee Stock Purchase Plan and form of agreements
          thereunder.
10.2*+    General Agreement for the Procurement of Products and
          Service and the Licensing of Software dated May 15, 1998
          between VINA Technologies, Inc. and Lucent Technologies,
          Inc.
10.3*+    OEM Purchase Agreement dated February 27, 1998 between VINA
          Technologies, Inc. and PainGain Technologies, Inc.
10.4*     Standard NNN Lease dated March 24, 1997 between VINA
          Technologies, Inc. and Limar Realty Corp.
10.5*     Form of Indemnification Agreement between VINA Technologies,
          Inc. and each of its directors and officers.
21.1*     Subsidiary.
23.1      Independent Auditors' Consent.
23.2*     Consent of Pillsbury Madison & Sutro LLP (included in
          Exhibit 5.1).
24.1      Power of Attorney (included on page II-4).
27.1      Financial Data Schedules.
</TABLE>

- ---------------
* To be filed by amendment.

+ Confidential treatment requested as to certain portions of this exhibit from
  the SEC. The omitted portions have been filed separately with the SEC.

<PAGE>   1
                                                                    EXHIBIT 23.1


INDEPENDENT AUDITORS' CONSENT

We consent to the use in this Registration Statement of VINA Technologies, Inc.
on Form S-1 of our report dated March 17, 2000, appearing in the Prospectus,
which is part of this Registration Statement, and of our report dated March 17,
2000 relating to the financial statement schedule appearing elsewhere in this
Registration Statement.

We also consent to the reference to us under the headings "Selected Financial
Data" and "Experts" in such Prospectus.






DELOITTE & TOUCHE LLP

San Jose, California
May 4, 2000

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-2000
<PERIOD-START>                             JAN-01-2000
<PERIOD-END>                               MAR-31-2000
<CASH>                                           8,915
<SECURITIES>                                    12,642
<RECEIVABLES>                                    3,448
<ALLOWANCES>                                     (236)
<INVENTORY>                                         90
<CURRENT-ASSETS>                                25,164
<PP&E>                                           2,969
<DEPRECIATION>                                 (1,285)
<TOTAL-ASSETS>                                  26,966
<CURRENT-LIABILITIES>                            5,721
<BONDS>                                              0
                                0
                                     48,120
<COMMON>                                        37,697
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                    26,966
<SALES>                                          5,187
<TOTAL-REVENUES>                                 5,187
<CGS>                                            3,239
<TOTAL-COSTS>                                    3,239
<OTHER-EXPENSES>                                 9,879
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  29
<INCOME-PRETAX>                                (7,805)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (7,805)
<EPS-BASIC>                                     (0.34)
<EPS-DILUTED>                                   (0.34)


</TABLE>


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