ADVANCED FIBRE COMMUNICATIONS INC
424B4, 1996-10-01
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
   
 PROSPECTUS
    
   
                                                    FILED PURSUANT TO
                                                    RULE 424(b)(4)
                                                    FILE NO. 333-8921
    
                                4,500,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
                             ---------------------
   
OF  THE 4,500,000  SHARES OF  COMMON STOCK  OFFERED, 3,800,000  SHARES ARE BEING
OFFERED INITIALLY IN THE UNITED STATES AND CANADA BY THE U.S. UNDERWRITERS AND
  700,000 SHARES ARE BEING OFFERED INITIALLY OUTSIDE OF THE UNITED STATES  AND
  CANADA  BY THE INTERNATIONAL UNDERWRITERS. SEE "UNDERWRITERS." ALL OF THE
     SHARES OF COMMON STOCK OFFERED HEREBY  ARE BEING SOLD BY THE  COMPANY.
     PRIOR
       TO  THIS OFFERING, THERE HAS BEEN  NO PUBLIC MARKET FOR THE COMMON
       STOCK OF THE COMPANY. SEE ``UNDERWRITERS" FOR A DISCUSSION OF THE
        FACTORS CONSIDERED IN  DETERMINING THE  INITIAL PUBLIC  OFFERING
        PRICE.
    
 
                         ------------------------------
 
         THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE ``RISK FACTORS"
                          COMMENCING ON PAGE 4 HEREOF.
                             ---------------------
 
THESE  SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS   THE
    SECURITIES  AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION
     PASSED  UPON   THE   ACCURACY   OR  ADEQUACY   OF   THIS   PROSPECTUS.
       ANY   REPRESENTATION  TO  THE  CONTRARY  IS  A  CRIMINAL  OFFENSE.
                            ------------------------
 
   
                               PRICE $25 A SHARE
    
                            ------------------------
 
   
<TABLE>
<CAPTION>
                                                                                  UNDERWRITING
                                                                PRICE TO         DISCOUNTS AND        PROCEEDS TO
                                                                 PUBLIC         COMMISSIONS (1)       COMPANY (2)
                                                           ------------------  ------------------  ------------------
<S>                                                        <C>                 <C>                 <C>
PER SHARE................................................        $25.00              $1.75               $23.25
TOTAL (3)................................................     $112,500,000         $7,875,000         $104,625,000
</TABLE>
    
 
- ------------
    (1) THE COMPANY  HAS AGREED  TO INDEMNIFY THE  UNDERWRITERS AGAINST  CERTAIN
       LIABILITIES,  INCLUDING LIABILITIES UNDER THE  SECURITIES ACT OF 1933, AS
       AMENDED.
 
    (2)  BEFORE  DEDUCTING  EXPENSES  PAYABLE   BY  THE  COMPANY  ESTIMATED   AT
       $1,200,000.
 
   
    (3)  THE COMPANY HAS GRANTED TO THE U.S. UNDERWRITERS AN OPTION, EXERCISABLE
       WITHIN 30 DAYS  OF THE DATE  HEREOF, TO  PURCHASE UP TO  AN AGGREGATE  OF
       675,000  ADDITIONAL  SHARES  AT  THE PRICE  TO  PUBLIC  LESS UNDERWRITING
       DISCOUNTS AND COMMISSIONS FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS, IF
       ANY. IF THE  U.S. UNDERWRITERS EXERCISE  SUCH OPTION IN  FULL, THE  TOTAL
       PRICE  TO PUBLIC, UNDERWRITING DISCOUNTS  AND COMMISSIONS AND PROCEEDS TO
       COMPANY WILL BE $129,375,000, $9,056,250 AND $120,318,750,  RESPECTIVELY.
       SEE "UNDERWRITERS."
    
                         ------------------------------
 
   
    THE  SHARES ARE OFFERED, SUBJECT TO PRIOR  SALE, WHEN, AS AND IF ACCEPTED BY
THE UNDERWRITERS NAMED HEREIN AND SUBJECT  TO APPROVAL OF CERTAIN LEGAL  MATTERS
BY WILSON, SONSINI, GOODRICH & ROSATI, PROFESSIONAL CORPORATION, COUNSEL FOR THE
UNDERWRITERS.  IT IS  EXPECTED THAT DELIVERY  OF THE  SHARES WILL BE  MADE ON OR
ABOUT OCTOBER 4, 1996 AT  THE OFFICE OF MORGAN  STANLEY & CO. INCORPORATED,  NEW
YORK, N.Y., AGAINST PAYMENT THEREFOR IN IMMEDIATELY AVAILABLE FUNDS.
    
 
                            ------------------------
 
MORGAN STANLEY & CO.
            INCORPORATED
 
                MERRILL LYNCH & CO.
 
                                COWEN & COMPANY
 
                                                               HAMBRECHT & QUIST
 
   
SEPTEMBER 30, 1996
    
<PAGE>
    NO  PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO  MAKE ANY REPRESENTATION OTHER  THAN AS CONTAINED IN  THIS
PROSPECTUS, AND IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR BY ANY UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY BY ANY PERSON IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL FOR SUCH PERSON TO
MAKE  SUCH AN OFFERING OR SOLICITATION.  NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY  SALE  MADE  HEREUNDER  SHALL UNDER  ANY  CIRCUMSTANCE  IMPLY  THAT  THE
INFORMATION  CONTAINED HEREIN IS CORRECT  AS OF ANY DATE  SUBSEQUENT TO THE DATE
HEREOF.
                            ------------------------
 
   
    UNTIL OCTOBER 25, 1996 (25 DAYS AFTER THE COMMENCEMENT OF THE OFFERING), ALL
DEALERS EFFECTING TRANSACTIONS IN THE COMMON STOCK, WHETHER OR NOT PARTICIPATING
IN THIS DISTRIBUTION,  MAY BE REQUIRED  TO DELIVER A  PROSPECTUS. THIS  DELIVERY
REQUIREMENT  IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A PROSPECTUS
WHEN ACTING  AS UNDERWRITERS  AND WITH  RESPECT TO  THEIR UNSOLD  ALLOTMENTS  OR
SUBSCRIPTIONS.
    
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                       PAGE
                                                                                                                     ---------
<S>                                                                                                                  <C>
Prospectus Summary.................................................................................................          3
Risk Factors.......................................................................................................          4
The Company........................................................................................................         13
Use of Proceeds....................................................................................................         14
Dividend Policy....................................................................................................         14
Capitalization.....................................................................................................         15
Dilution...........................................................................................................         16
Selected Consolidated Financial Data...............................................................................         17
Management's Discussion and Analysis of Financial Condition and Results of Operations..............................         18
Business...........................................................................................................         25
Management.........................................................................................................         39
Certain Transactions...............................................................................................         50
Principal Stockholders.............................................................................................         53
Description of Capital Stock.......................................................................................         55
Shares Eligible for Future Sale....................................................................................         58
Underwriters.......................................................................................................         60
Legal Matters......................................................................................................         63
Experts............................................................................................................         63
Additional Information.............................................................................................         63
Glossary of Terms..................................................................................................         64
Index to Financial Statements......................................................................................        F-l
</TABLE>
 
                            ------------------------
 
    The  Company intends to  furnish its stockholders  annual reports containing
audited consolidated financial statements examined by an independent  accounting
firm  and quarterly  reports for  the first three  quarters of  each fiscal year
containing interim unaudited consolidated financial information.
                            ------------------------
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE  COMPANY AT  A LEVEL ABOVE  THAT WHICH  MIGHT OTHERWISE PREVAIL  IN THE OPEN
MARKET. SUCH  TRANSACTIONS MAY  BE EFFECTED  ON THE  NASDAQ NATIONAL  MARKET  OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
                            ------------------------
 
    The  Universal Modular Carrier  1000-TM- is a trademark  of the Company. All
other trademarks or trade names referred to in this Prospectus are the  property
of their respective owners.
                            ------------------------
 
    EXCEPT AS OTHERWISE NOTED HEREIN, INFORMATION IN THIS PROSPECTUS (I) ASSUMES
NO  EXERCISE  OF  THE  UNDERWRITERS'  OVER-ALLOTMENT  OPTION,  (II)  REFLECTS  A
TWO-FOR-ONE STOCK SPLIT EFFECTED IN AUGUST 1996 AND (III) REFLECTS THE AUTOMATIC
CONVERSION UPON  THE CLOSING  OF  THIS OFFERING  OF  ALL OUTSTANDING  SHARES  OF
PREFERRED  STOCK OF THE COMPANY INTO AN AGGREGATE OF 18,717,463 SHARES OF COMMON
STOCK. THE COMPANY OPERATES ON A 13-WEEK FISCAL QUARTER, COMPRISED OF FOUR, FOUR
AND FIVE  WEEK MONTHS  ENDING ON  THE  LAST SATURDAY  OF THE  LAST WEEK  OF  THE
FIVE-WEEK MONTH. FOR PRESENTATION PURPOSES ONLY, THE COMPANY HAS SHOWN ITS FIRST
THREE  FISCAL QUARTERS AS ENDING ON MARCH 31, JUNE 30, AND SEPTEMBER 30, AND ITS
FISCAL YEAR AS ENDING ON DECEMBER 31.
<PAGE>
             THE UMC SYSTEM PROVIDES COST-EFFECTIVE, MULTI-FEATURE
             SUBSCRIBER LOOP SOLUTIONS FOR SMALL LINE-SIZE MARKETS.
 
The UMC architecture is based upon a modular software and hardware product
platform that can be configured and adapted to the particular requirements of
the customer.
Line cards are designed to provide voice and data transmissions in either analog
or digital form for both domestic and international requirements.
The Company believes that the UMC system is the only digital loop carrier that
can operate simultaneously over a variety of transmission media, including
copper wire, fiber optic cable, coaxial cable and analog radio networks.
 
<TABLE>
<S>                                                                              <C>
                                                                                 The proprietary backplane
                                                                                 design currently supports
                                                                                 a variety of voice and
                                                                                 data services.
 
        [diagram of the UMC channel bank assembly including line cards]          The UMC system is easily
                                                                                 scalable from six to 672
                                                                                 lines through the addition
                                                                                 of plug-in components.
</TABLE>
 
<TABLE>
<S>                          <C>
The UMC system was designed  [diagram of basic UMC configuration]
to require a minimum number
of common control units to
provide a cost-effective
subscriber loop solution.
</TABLE>
 
[AFC Logo]
<PAGE>
                               PROSPECTUS SUMMARY
 
    THIS  PROSPECTUS  CONTAINS CERTAIN  STATEMENTS  OF A  FORWARD-LOOKING NATURE
RELATING TO FUTURE EVENTS OR THE FUTURE FINANCIAL PERFORMANCE OF THE COMPANY. IN
EVALUATING SUCH STATEMENTS, PROSPECTIVE  INVESTORS SHOULD SPECIFICALLY  CONSIDER
THE  VARIOUS FACTORS IDENTIFIED  IN THIS PROSPECTUS,  INCLUDING, BUT NOT LIMITED
TO, THE MATTERS SET  FORTH UNDER THE CAPTION  "RISK FACTORS," WHICH COULD  CAUSE
ACTUAL RESULTS TO DIFFER MATERIALLY FROM THOSE INDICATED BY SUCH FORWARD-LOOKING
STATEMENTS.  THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE
DETAILED INFORMATION  AND CONSOLIDATED  FINANCIAL STATEMENTS  AND NOTES  THERETO
APPEARING  ELSEWHERE IN THIS PROSPECTUS. SEE "GLOSSARY  OF TERMS" ON PAGE 64 FOR
DEFINITIONS OF VARIOUS ACRONYMS AND TECHNICAL TERMS USED IN THIS PROSPECTUS.
 
                                  THE COMPANY
 
    Advanced Fibre  Communications,  Inc.  ("AFC"  or  the  "Company")  designs,
develops,  manufactures,  markets  and supports  the  Universal  Modular Carrier
1000-TM- (the  "UMC"  system),  a  cost-effective,  multi-feature  digital  loop
carrier  system developed  to serve small  line-size markets.  The Company's UMC
system is  designed to  enable telephone  companies, cable  companies and  other
service  providers to connect subscribers to the central office switch for voice
and data communications over copper wire,  fiber optic cable, coaxial cable  and
analog  radio networks.  The Company  believes that the  UMC system  is the only
digital  loop  carrier  that  can  operate  simultaneously  over  a  variety  of
transmission  media.  The UMC  system meets  the  service needs  of subscribers,
including plain old telephone  service, universal voice  grade service and  high
speed  digital data service.  ISDN capability is currently  in beta testing, and
the Company believes the  UMC system will be  capable of providing  asynchronous
and synchronous data channel service in the near future.
 
    The  UMC  system  has  been  sold to  more  than  350  independent telephone
companies in the  United States, is  being initially deployed  by Ameritech  and
GTE,  and is in laboratory  or field trials at  Pacific Bell, BellSouth and U.S.
West. The Company has also sold the UMC system to telephone companies in France,
Hong Kong, Canada, Mexico, the Netherlands Antilles, the Dominican Republic  and
China.  The UMC  system is distributed  and serviced worldwide  through a direct
sales force  in  the  United  States and  through  distributors  and  agents  in
international markets.
 
                                  THE OFFERING
 
   
<TABLE>
<S>                                                                 <C>
U.S. Offering.....................................................  3,800,000 shares
International Offering............................................  700,000 shares
    Total.........................................................  4,500,000 shares
Common Stock to be outstanding after the offering.................  29,286,947 shares (1)
Use of proceeds...................................................  For repayment of approximately $14.8 million
                                                                    of indebtedness and for general corporate
                                                                    purposes, including working capital
Nasdaq National Market symbol.....................................  AFCI
</TABLE>
    
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                                       SIX MONTHS
                                                                     YEAR ENDED DECEMBER 31,         ENDED JUNE 30,
                                                                 -------------------------------  --------------------
                                                                   1993       1994       1995       1995     1996 (2)
                                                                 ---------  ---------  ---------  ---------  ---------
<S>                                                              <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues.......................................................  $     620  $  18,802  $  54,287  $  19,245  $  53,772
Gross profit (loss)............................................     (1,954)     4,678     20,818      7,324     22,714
Operating income (loss)........................................     (7,291)    (7,791)     3,805        348    (10,028)
Net income (loss)..............................................     (7,291)    (7,765)     2,341       (155)    (1,541)
Pro forma net income (loss) per share (3)......................                        $    0.09  $   (0.01) $   (0.06)
Shares used in per share computations (3)......................                           27,329     23,800     24,711
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                                                JUNE 30, 1996
                                                                                          --------------------------
                                                                                           ACTUAL    AS ADJUSTED (4)
                                                                                          ---------  ---------------
<S>                                                                                       <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents...............................................................  $  10,885     $  97,504
Working capital.........................................................................     23,720       127,145
Total assets............................................................................     67,299       153,918
Redeemable convertible preferred stock..................................................     39,317        --
Total stockholders' equity (deficit)....................................................     (8,241)      134,501
</TABLE>
    
 
- -------------
(1)  Based on  the number of  shares outstanding  as of June  30, 1996. Excludes
    7,175,676 shares of Common Stock  reserved for issuance under the  Company's
    stock  option plans, under  which options to  purchase 4,076,918 shares were
    outstanding as of June 30, 1996, and 1,500,000 shares reserved for  issuance
    under  the Company's Employee  Stock Purchase Plan.  Also excludes 5,135,080
    shares of Common  Stock reserved for  issuance pursuant to  the exercise  of
    warrants outstanding as of June 30, 1996. See "Management -- Stock Incentive
    Plan,"  "  --  Employee  Stock Purchase  Plan,"  "Certain  Transactions" and
    "Description of Capital Stock."
 
(2) Includes a charge  of $15.8 million  in the quarter ended  June 30, 1996  to
    reflect  a cash payment of  $3.0 million paid in  June 1996, additional cash
    payments of $8.5 million (subject to reduction to present value in the event
    of prepayment) payable through  2001 and the issuance  of 719,424 shares  of
    Common  Stock to DSC Communications Corporation in settlement of outstanding
    litigation. See  "Business  --  Legal  Proceedings."  Without  this  charge,
    operating income for the six months ended June 30, 1996 would have been $5.8
    million.
 
(3)  See Note 1 of Notes to Consolidated Financial Statements for an explanation
    of the determination of the number of shares used in computing pro forma net
    income (loss) per share.
 
   
(4) As adjusted to reflect (i) the  sale of 4,500,000 shares of Common Stock  by
    the  Company  (after deducting  underwriting  discounts and  commissions and
    estimated offering  expenses), (ii)  the application  of the  estimated  net
    proceeds  therefrom  and  (iii)  the conversion  upon  the  closing  of this
    offering of all outstanding shares of Preferred Stock of the Company into an
    aggregate of  18,717,463 shares  of  Common Stock.  See "Use  of  Proceeds,"
    "Capitalization" and Note 1 of Notes to Consolidated Financial Statements.
    
 
                                       3
<PAGE>
                                  RISK FACTORS
 
    THIS  PROSPECTUS CONTAINS FORWARD-LOOKING STATEMENTS WHICH INVOLVE RISKS AND
UNCERTAINTIES. THE COMPANY'S ACTUAL RESULTS  COULD DIFFER MATERIALLY FROM  THOSE
ANTICIPATED  IN THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF CERTAIN FACTORS,
INCLUDING THOSE SET FORTH  IN THE FOLLOWING RISK  FACTORS AND ELSEWHERE IN  THIS
PROSPECTUS.  IN EVALUATING THE COMPANY'S  BUSINESS, PROSPECTIVE INVESTORS SHOULD
CAREFULLY CONSIDER THE FOLLOWING  FACTORS IN ADDITION  TO THE OTHER  INFORMATION
PRESENTED IN THIS PROSPECTUS.
 
    LIMITED   HISTORY  OF  OPERATIONS  AND   PROFITABILITY.    The  Company  was
incorporated in May 1992  and was in the  initial startup and development  phase
through  December 1993. The Company began shipping  the UMC in January 1994 and,
accordingly,  has  a  limited  operating  history.  The  Company  has   incurred
substantial  expenditures related to the  development, manufacturing startup and
marketing of the UMC  system. As a result  of these expenditures, combined  with
$25.9  million of  expenses and settlement  amounts recorded  in connection with
certain litigation with DSC Communications Corporation ("DSC") which was settled
in June 1996, the Company had an accumulated deficit of $14.9 million as of June
30, 1996.  Although  the Company  first  achieved profitability  in  the  second
quarter  of 1995, it  recorded a net loss  in the second quarter  of 1996 due to
charges associated with the settlement of litigation with DSC, and there can  be
no  assurance that the Company will sustain or increase its profitability in the
future. See "Management's  Discussion and  Analysis of  Financial Condition  and
Results of Operations" and "Business -- Legal Proceedings."
 
    POTENTIAL  FLUCTUATIONS  IN  FUTURE  OPERATING  RESULTS;  SEASONALITY.   The
Company's operating results have  been, and will continue  to be, affected by  a
wide  variety of factors,  some of which  are outside of  the Company's control,
that could have a material adverse effect on revenues and results of  operations
during  any particular  period. These  factors include:  the timing  and size of
orders which are received and can be  shipped in a quarter; the availability  of
adequate  supplies  of  key  components  and  assemblies  and  the  adequacy  of
manufacturing capacity;  the Company's  ability to  introduce new  products  and
technologies  on  a timely  basis; the  timing of  new product  introductions or
announcements by the Company or its competitors; price competition; unit volume;
customer mix; and the mix between domestic and international sales.
 
    The UMC system is sold primarily to telephone companies that install the UMC
system as part of their access  networks. Additions to those networks  represent
complex  engineering projects which can require from three to twelve months from
project conceptualization  to completion.  The UMC  system typically  represents
only a portion of a given project and, therefore, the timing of product shipment
and revenue recognition is often difficult to forecast. In developing countries,
delays  and  reductions  in the  planned  project  deployment can  be  caused by
additional factors, including reductions in capital availability due to declines
in  the  local   economy,  currency  fluctuations,   priority  changes  in   the
government's  budget and delays in  receiving government approval for deployment
of the UMC system in the local loop. The Company's expenditures for research and
development, marketing and sales, and  general and administrative functions  are
based  in part on future revenue projections and in the near term are relatively
fixed. The  Company may  be unable  to adjust  spending in  a timely  manner  in
response to any unanticipated declines in revenues. Accordingly, any significant
decline  in demand for  the UMC system  relative to planned  levels could have a
material adverse  effect  on the  Company's  business, financial  condition  and
results  of operations in that quarter or  subsequent quarters. All of the above
factors are difficult to forecast, and  these or other factors could  materially
adversely  affect  the Company's  business, financial  condition and  results of
operations. As a result, the Company believes that period-to-period  comparisons
are  not necessarily meaningful and should not  be relied upon as indications of
future performance. Fluctuations  in the Company's  operating results may  cause
volatility  in the price  of the Company's  Common Stock. Further,  it is likely
that in some future quarter the Company's revenues or operating results will  be
below  the expectations of  public market analysts or  investors. In such event,
the market  price of  the  Company's Common  Stock  would likely  be  materially
adversely affected.
 
    The Company's customers normally install the equipment in outdoor locations.
Shipments  of the  UMC system  are subject to  the effects  of seasonality, with
fewer installation projects  scheduled for the  winter months. Accordingly,  the
Company  believes that over time this seasonality will cause its revenues in the
 
                                       4
<PAGE>
quarter ended March 31 to be lower than revenues in the preceding quarter  ended
December  31. See "Management's  Discussion and Analysis  of Financial Condition
and Results of Operations -- Quarterly Results of Operations."
 
    DEPENDENCE ON TELECOMMUNICATIONS INDUSTRY AND  SMALL LINE-SIZE MARKET.   The
Company's  customers are  concentrated in the  public carrier telecommunications
industry. Accordingly, the  Company's future  success depends  upon the  capital
spending  patterns of such customers and  the continued demand by such customers
for the  UMC  system. The  target  markets for  the  UMC system  are  the  small
line-size  markets of the United  States and developing countries. Historically,
these markets have had little access to  the advanced services that can be  made
available  through the  UMC system and,  accordingly, there can  be no assurance
that potential customers  will consider the  near term value  of these  advanced
services  to be sufficient  to influence their  purchase decisions. Furthermore,
there can be no  assurance that the UMC  system will find widespread  acceptance
among  the telephone companies and other  potential customers in small line-size
markets  or  that  such  customers  and  potential  customers  will  not   adopt
alternative  architectures or  technologies that  are incompatible  with the UMC
technology, which  would  have  a  material  adverse  effect  on  the  Company's
business,  financial condition and results of operations. In addition, there can
be no assurance that telephone companies, foreign governments or other customers
will pursue infrastructure upgrades that will necessitate the implementation  of
advanced  products such as the UMC system. Infrastructure improvements requiring
the Company's or similar technology may be delayed or prevented by a variety  of
factors,  including cost, regulatory obstacles, the  lack of consumer demand for
advanced telecommunications  services  and  alternative  approaches  to  service
delivery.  See "Management's Discussion and  Analysis of Financial Condition and
Results   of   Operations,"   "Business   --   Markets   and   Customers"    and
"-- Competition."
 
    CONCENTRATED PRODUCT LINE, NEW PRODUCTS AND RAPID TECHNOLOGICAL CHANGE.  The
Company  currently derives substantially all of its revenues from the UMC system
and expects that this concentration will continue in the foreseeable future.  As
a  result, any decrease in the overall level of sales of, or the prices for, the
UMC system due to  product enhancements, introductions  or announcements by  the
Company's  competitors,  a decline  in the  demand for  the UMC  system, product
obsolescence or any  other reason could  have a material  adverse effect on  the
Company's   business,  financial  condition  and   results  of  operations.  See
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations."
 
    The telecommunications equipment market is characterized by rapidly changing
technology,  evolving industry standards, changes  in end-user requirements, and
frequent  new  product  introductions  and  enhancements.  The  introduction  of
products  embodying new technologies or the  emergence of new industry standards
can render existing  products obsolete  or unmarketable.  The Company's  success
will  depend upon its ability  to enhance the UMC  technology and to develop and
introduce, on a  timely basis, new  products that keep  pace with  technological
developments  and  emerging  industry standards  and  address  changing customer
requirements in a  cost-effective manner.  There can  be no  assurance that  the
Company  will  be  successful  in  identifying,  developing,  manufacturing, and
marketing product enhancements  or new  products that  respond to  technological
change  or evolving  industry standards,  that the  Company will  not experience
difficulties  that   could  delay   or  prevent   the  successful   development,
introduction  and  marketing of  these products,  or that  its new  products and
product enhancements will  adequately meet the  requirements of the  marketplace
and  achieve market acceptance. Furthermore, from  time to time, the Company may
announce new products  or product  enhancements, services  or technologies  that
have  the potential to replace  or shorten the life cycle  of the UMC system and
that may cause customers  to defer purchasing  the UMC system.  There can be  no
assurance  that future technological advances in the telecommunications industry
will not diminish market acceptance of the  UMC system or render the UMC  system
obsolete  and,  thereby,  materially adversely  affect  the  Company's business,
financial condition and results of operations.
 
    The  Company   has  experienced   delays  in   completing  development   and
introduction  of new products, product variations and features, and there can be
no assurance  that  such  delays will  not  continue  or recur  in  the  future.
Furthermore,  the UMC system  contains a significant  amount of complex software
that may contain undetected or unresolved  errors as products are introduced  or
as  new versions are released.  The Company has in  the past discovered software
errors   in   certain    UMC   system   installations.    There   can   be    no
 
                                       5
<PAGE>
assurance that, despite significant testing by the Company, software errors will
not  be  found in  new  enhancements of  the  UMC system  after  commencement of
shipments, resulting in delays in or loss of market acceptance, either of  which
could  have  a  material adverse  effect  on the  Company's  business, financial
condition and  results of  operations.  See "Business  -- Competition"  and  "--
Research and Product Development."
 
    DEPENDENCE  ON SOLE-SOURCE AND OTHER KEY SUPPLIERS.  Certain components used
in the  Company's  products,  including the  Company's  proprietary  application
specific integrated circuits ("ASICs"), codecs, certain surface mount technology
components  and other  components, are  only available  from a  single source or
limited number of  suppliers. Some  of the Company's  sole-source suppliers  are
companies  which  from  time  to  time  allocate  parts  to  telephone equipment
manufacturers due to market demand for telecommunications equipment. Many of the
Company's competitors  are  much larger  and  may  be able  to  obtain  priority
allocations  from these shared suppliers,  thereby limiting or making unreliable
the sources  of supply  for  these components.  The Company  encountered  supply
delays  for  codecs in  the second  quarter  of 1994  which resulted  in delayed
shipments of  the  UMC  system, and  there  can  be no  assurance  that  similar
shortages  will not occur in the future or will not result in the Company having
to pay  a higher  price  for components.  If the  Company  is unable  to  obtain
sufficient  quantities of these or any other components, delays or reductions in
manufacturing or  product shipments  could  occur which  would have  a  material
adverse  effect on  the Company's business,  financial condition  and results of
operations. See "Business -- Manufacturing."
 
    DEPENDENCE ON  LIMITED  NUMBER  OF THIRD  PARTY  MANUFACTURERS  AND  SUPPORT
ORGANIZATIONS.     The  Company  relies  on  a  limited  number  of  independent
contractors that manufacture the  subassemblies to the Company's  specifications
for  use in the  Company's products. In  particular, the Company  relies on: (i)
Flextronics International  Ltd. and  Tanon Manufacturing,  Inc. (a  division  of
Electronic  Associates, Inc.) to manufacture the Company's printed circuit board
assemblies; (ii)  Paragon,  Inc.  to manufacture  backplanes  and  channel  bank
assemblies and (iii) Sonoma Metal Products, Inc. and Cowden Metal San Jose, Inc.
to   manufacture  the  outside  cabinets.  In   the  event  that  the  Company's
subcontractors were to experience financial, operational, production, or quality
assurance difficulties that resulted in a reduction or interruption in supply to
the  Company  or   otherwise  failed   to  meet   the  Company's   manufacturing
requirements,  the  Company's  business,  financial  condition  and  results  of
operations would be adversely affected until the Company established  sufficient
manufacturing  supply from alternative  sources. There can  be no assurance that
the Company's current  or alternative  manufacturers will  be able  to meet  the
Company's  future requirements or that such manufacturing services will continue
to be available to the Company at favorable prices, or at all. See "Business  --
Manufacturing."
 
    The   Company   also   relies   on   Point-to-Point   Communications,   Inc.
("Point-to-Point"), a third-party  support organization,  to provide  first-line
technical  assistance and post-sales  support to AFC customers.  There can be no
assurance that Point-to-Point  will be  able to  provide the  level of  customer
support demanded by the Company's existing or potential customers. See "Business
- -- Sales, Marketing and Customer Support."
 
    COMPETITION.  The market for equipment for local telecommunications networks
is  extremely competitive. The Company's competitors range from small companies,
both domestic  and  international,  to  large  multinational  corporations.  The
Company's  competitors include Alcatel Alsthom Compagnie Generale d'Electricite,
DSC, ECI Telecom, Inc., E/O Networks, Fujitsu America, Inc., Hitron  Technology,
Inc., Lucent Technologies, Inc., NEC America, Inc., Northern Telecom Ltd., Opnet
Technologies  Co. Ltd.,  RELTEC Corporation, Seiscor  Technologies Inc., Siemens
Corporation, Teledata Communications Ltd. and  Vidar-SMS Co. Ltd. Many of  these
competitors  have more  extensive financial,  marketing and  technical resources
than the Company and enjoy superior name recognition in the market. In addition,
the Company has entered into agreements with the Industrial Technology  Research
Institute  ("ITRI") to jointly develop products based on the UMC system. ITRI is
a Taiwanese government-sponsored  research and development  organization in  the
telecommunications  field. Such agreements grant ITRI  and certain of its member
companies certain rights to manufacture and sell the European Telecommunications
Standards Institute ("ETSI") version of the UMC system outside of North America.
Such entities  currently  compete with  the  Company in  international  markets,
primarily  in  China.  In  addition, upon  termination  of  the  agreements with
 
                                       6
<PAGE>
   
ITRI  in  2002,  ITRI  will  have  a  worldwide,  non-exclusive,   royalty-free,
irrevocable  license  to  use  the  ETSI  version  of  the  UMC  technology and,
consequently, such member  companies will be  able to compete  with the  Company
worldwide  at  such time.  There  is an  ongoing  dispute subject  to litigation
between the  Company and  ITRI and  such  member companies  as to,  among  other
things, whether ITRI possesses the right to grant such rights to manufacture and
sell  the ETSI version of the UMC system to new member companies and whether AFC
has terminated or may terminate such agreements  and the rights, if any, of  the
member  companies  thereunder. Depending  on the  outcome  of this  dispute, the
Company may face competition from new  member companies for the ETSI version  of
the  UMC  system. Such  companies may  possess substantially  greater financial,
marketing and technical resources  than the Company. The  Company may also  face
competition from new market entrants. There can be no assurance that the Company
will   be  able  to  compete  successfully  in  the  future.  See  "Business  --
Competition," "-- Proprietary Rights and Licenses" and "-- Legal Proceedings."
    
 
    RISKS ASSOCIATED WITH PENDING LITIGATION.  The Company is a party to certain
legal proceedings  including the  litigation between  the Company  and ITRI  and
certain of its member companies arising primarily out of a dispute regarding the
payment  of royalties and the  supply of ASICS under  the agreements between the
Company and  ITRI. The  Company is  unable  to determine  the total  expense  or
possible  loss, if  any, that  may ultimately be  incurred in  the resolution of
these proceedings. Regardless of the ultimate outcome of these proceedings, they
could result in significant diversion of time by the Company's management. After
consideration of  the nature  of the  claims  and the  facts relating  to  these
proceedings,  the Company believes that the resolution of these proceedings will
not have  a  material  adverse  effect  on  the  Company's  business,  financial
condition  and results of operations; however, the results of these proceedings,
including any potential settlements, are uncertain and there can be no assurance
to that effect. See "Business -- Competition" and "-- Legal Proceedings."
 
    LIMITED PROTECTION OF PROPRIETARY TECHNOLOGY; RISK OF THIRD-PARTY CLAIMS  OF
INFRINGEMENT.    The  Company  attempts  to  protect  its  technology  through a
combination of copyrights,  trade secret laws  and contractual obligations.  The
Company does not presently hold any patents for its existing products and has no
patent  applications  pending.  There can  be  no assurance  that  the Company's
intellectual  property  protection  measures  will  be  sufficient  to   prevent
misappropriation  of the Company's technology  or that the Company's competitors
will not independently develop technologies that are substantially equivalent or
superior to the  Company's technology.  In addition,  the laws  of many  foreign
countries  do not protect the Company's intellectual property rights to the same
extent as the laws of the United  States. The failure of the Company to  protect
its  proprietary  information  could  have  a  material  adverse  effect  on the
Company's business, financial condition and results of operations.
 
    The increasing dependence of the telecommunications industry on  proprietary
technology  has  resulted in  frequent litigation  based  on allegations  of the
infringement of patents  and other intellectual  property. The Company  recently
settled  litigation with DSC  under which DSC had  claimed proprietary rights to
the UMC  technology. See  "Business --  Legal Proceedings."  In the  future  the
Company  may  be  subject to  additional  litigation to  defend  against claimed
infringements of the rights of others or to determine the scope and validity  of
the  proprietary rights  of others. Future  litigation also may  be necessary to
enforce and protect trade secrets  and other intellectual property rights  owned
by  the Company.  Any such  litigation could  be costly  and cause  diversion of
management's attention, either of which could have a material adverse effect  on
the  Company's business, financial condition  and results of operations. Adverse
determinations in such  litigation could  result in  the loss  of the  Company's
proprietary  rights, subject the Company to significant liabilities, require the
Company to  seek  licenses from  third  parties,  or prevent  the  Company  from
manufacturing  or selling its products,  any one of which  could have a material
adverse effect on  the Company's  business, financial condition  and results  of
operations.  Furthermore, there can be no  assurance that any necessary licenses
will be available on reasonable terms.  See "Business -- Proprietary Rights  and
Licenses."
 
    RISK  OF FAILURE TO  MANAGE EXPANDING OPERATIONS.   The Company has recently
experienced a period  of rapid growth,  which has placed  and could continue  to
place,  a significant strain on the Company's management, operational, financial
and other resources. The members of  the Company's management team have  limited
experience in the management of rapidly growing companies. To effectively manage
the recent
 
                                       7
<PAGE>
growth  as well as any  future growth, the Company  will need to recruit, train,
assimilate, motivate and retain qualified managers and employees. Management  of
future  growth,  if such  growth occurs,  may require  the Company  to implement
expanded or new management and accounting systems. Information systems expansion
or replacement can be  a complex, costly and  time-consuming process, and  there
can  be  no  assurance that  any  such  activities can  be  accomplished without
disruption of the Company's  business. Any business  disruption or other  system
transition  difficulties could have  a material adverse  effect on the Company's
business, financial  condition and  results of  operations. The  failure of  the
Company  to effectively manage its domestic  and international operations or any
current or future growth could have  a material adverse effect on the  Company's
business,  financial condition and results  of operations. The Company's results
of  operations  will  be  adversely   affected  if  revenues  do  not   increase
sufficiently to compensate for the increase in operating expenses resulting from
any  expansion.  See  "Business  --  Employees"  and  "Management  --  Executive
Officers, Key Employees and Directors."
 
    CUSTOMER CONCENTRATION.   Approximately  15.7% and  15.6% of  the  Company's
revenues  in 1995 and the  first six months of  1996, respectively, were derived
from sales to  ALLTEL Supply, Inc.  In 1995 and  the six months  ended June  30,
1996,  the Company's five  largest customers accounted  for approximately 37% of
revenues. Although the Company's  largest customers have  varied from period  to
period,  the Company  anticipates that  its results  of operations  in any given
period will continue to  depend to a  significant extent upon  sales to a  small
number  of  customers.  None of  the  Company's  customers has  entered  into an
agreement requiring it to purchase a minimum amount of product from the Company.
There can be no assurance that  the Company's principal customers will  continue
to  purchase product from the Company at current  levels, if at all. The loss of
one or  more  major  customers could  have  a  material adverse  effect  on  the
Company's   business,  financial  condition  and   results  of  operations.  See
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations" and "Business -- Markets and Customers."
 
    RISKS   ASSOCIATED   WITH  INTERNATIONAL   MARKETS.     International  sales
constituted 13.2% and 12.6% of the Company's total revenues in 1995 and the  six
months ended June 30, 1996, respectively. International sales have fluctuated in
absolute  dollars and as a percentage of  revenues, and are expected to continue
to fluctuate in future  periods. The Company relies  on a number of  third-party
distributors  and agents  to market  and sell  the UMC  system outside  of North
America. There can be no assurance that such distributors or agents will provide
the support and effort necessary  to service international markets  effectively.
The  Company intends to  expand its existing  international operations and enter
new international markets,  which will demand  significant management  attention
and  financial commitment.  The Company's  management has  limited experience in
international operations, and there  can be no assurance  that the Company  will
successfully  expand  its international  operations.  In addition,  a successful
expansion by the Company  of its international operations  and sales in  certain
markets may depend on the Company's ability to establish and maintain productive
strategic relationships. To date, the Company has formed three joint ventures to
pursue  international markets, two of  which have been or  are in the process of
being terminated  or  liquidated  due  to differences  with  the  joint  venture
partners.  There can be no  assurance that the Company  will be able to identify
suitable parties for joint ventures or strategic relationships or, even if  such
parties   are   identified,  that   successful   joint  ventures   or  strategic
relationships will result. Moreover, there can be no assurance that the  Company
will be able to increase international sales of the UMC system through strategic
relationships  or joint ventures. The failure to do so could significantly limit
the Company's ability to  expand its international operations  and could have  a
material  adverse  effect on  the  Company's business,  financial  condition and
results of operations.
 
    International telephone  companies  are  in many  cases  owned  or  strictly
regulated  by  local regulatory  authorities. Access  to  such markets  is often
difficult due to  the established  relationships between a  government owned  or
controlled  telephone  company  and  its  traditional  indigenous  suppliers  of
telecommunications equipment. In  addition, the Company's  bids for business  in
certain international markets typically will require the Company to post bid and
performance  bonds and  to incur contract  penalties should the  company fail to
meet production and delivery time schedules on large orders. The failure of  the
Company  to meet these schedules  could result in the  loss of collateral posted
for the bonds or financial penalties which could adversely affect the  Company's
business, financial condition and results of operations.
 
                                       8
<PAGE>
    The   Company's   international   sales   currently   are   primarily   U.S.
dollar-denominated. As a  result, an increase  in the value  of the U.S.  dollar
relative   to  foreign  currencies  could   make  the  Company's  products  less
competitive in international markets. For example, increases in the value of the
U.S. dollar relative to the Mexican peso in late 1994 resulted in a  significant
decrease  in  sales  of  the  UMC  system  to  Telefonos  de  Mexico  for  1995.
Furthermore, operating in international markets subjects the Company to  certain
additional  risks,  including  unexpected  changes  in  regulatory requirements,
political and economic  conditions, tariffs or  other barriers, difficulties  in
staffing  and  managing  international operations,  exchange  rate fluctuations,
potential exchange and  repatriation controls on  foreign earnings,  potentially
negative  tax consequences,  longer sales and  payment cycles  and difficulty in
accounts receivable  collection.  In addition,  any  inability to  obtain  local
regulatory  approval could delay or prevent entrance into international markets,
which could materially  impact the Company's  business, financial condition  and
results of operations. In order to compete in international markets, the Company
will  need to comply  with various regulations  and standards. See "Management's
Discussion and  Analysis  of Financial  Condition  and Results  of  Operations,"
"Business  --  Markets  and Customers"  and  "-- Sales,  Marketing  and Customer
Support."
 
    DEPENDENCE ON KEY PERSONNEL.  The Company's success depends to a significant
extent upon a number of key  technical and management employees. In  particular,
the  Company's success  depends in  large part  on the  knowledge, expertise and
services of  its co-founders:  Donald Green,  Chairman of  the Board  and  Chief
Executive  Officer; James  T. Hoeck,  Vice President,  Advanced Development; and
John W. Webley, Vice President, Advanced  Development. The loss of the  services
of  any of  these persons  or other key  employees of  the Company  could have a
material adverse  effect  on the  Company's  business, financial  condition  and
results  of operations. The Company does not have employment agreements with, or
key person life  insurance for,  any of  its employees.  Competition for  highly
qualified  employees is  intense and the  process of locating  key technical and
management personnel with the combination  of skills and attributes required  to
execute  the Company's strategy is often lengthy. There can be no assurance that
the Company will  be successful in  retaining its existing  key personnel or  in
attracting   and  retaining  the  additional   employees  it  may  require.  See
"Management."
 
   
    COMPLIANCE WITH  REGULATIONS AND  INDUSTRY  STANDARDS.   The UMC  system  is
required  to  comply with  a  large number  of  voice and  data  regulations and
standards, which vary between domestic  and international markets, and may  vary
by  the specific international market into which the Company sells its products.
The standards in the United States are determined by the Federal  Communications
Commission  ("FCC"),  by  Underwriters  Laboratories,  by  independent telephone
companies and  by Bell  Communications Research  ("Bellcore"). In  international
markets,  the Company's products must comply  with recommendations issued by the
Consultative  Committee  on  International  Telegraph  and  Telephony  and  with
requirements  established by the individual  regional carriers which specify how
equipment that is connected to their  local networks must operate. In  addition,
the  Company's  products  must  comply with  standards  issued  by  the European
Telecommunications Standards  Institute.  These standards  are  implemented  and
enforced by the Telecommunications Regulatory Authority of each European nation.
Standards  for new services continue to evolve, and the Company will be required
to modify its products or  develop and support new  versions of its products  to
meet these standards. The failure of the Company's products to comply, or delays
in  meeting compliance,  with the  evolving standards  both in  its domestic and
international markets  could have  a material  adverse affect  on the  Company's
business, financial condition and results of operations.
    
 
   
    In  addition, the Company will  need to ensure that  its products are easily
integrated with  the carriers'  network management  systems. The  Regional  Bell
Operating  Companies  ("RBOCs"), which  represent a  large  segment of  the U.S.
telecommunications market, in many cases require that equipment integrated  into
their  networks  be  tested  by  Bellcore,  indicating  that  the  products  are
interoperable with the operations, administration, maintenance and  provisioning
systems  used by the  RBOCs to manage their  networks. Bellcore testing requires
significant investments  in  resources to  achieve  compliance. The  UMC  system
recently  completed a Bellcore technical audit  and was found to meet applicable
requirements. The failure  to maintain such  compliance or to  obtain it on  new
features  released in  the future  could have a  material adverse  affect on the
Company's business, financial condition and results of operations.
    
 
                                       9
<PAGE>
    The Company has not received ISO certification, which certifies that  design
and  manufacturing  processes  adhere  to  certain  established  standards. Many
telecommunications service  providers,  particularly in  international  markets,
will   not  purchase  products  from  suppliers   that  have  not  received  ISO
certification. Accordingly, until it  is able to  obtain ISO certification,  the
Company  may be precluded  from selling its products  to these service providers
and its ability to compete with other suppliers of communications equipment  may
be  adversely affected.  The Company intends  to initiate the  formal process of
applying for ISO-9001 certification during  the first quarter of 1997.  ISO-9001
addresses quality assurance in design, development, production, installation and
service.  There can be  no assurance as to  when or if  the Company will receive
such certification. The failure  to obtain such  certification may preclude  the
Company from selling the UMC system in certain markets.
 
    The   U.S.   Congress   recently   passed   new   regulations   that  affect
telecommunications services, including changes to pricing, access by competitive
suppliers and  many  other broad  changes  to the  data  and  telecommunications
networks  and services. These changes will have a major impact on the pricing of
existing services,  and may  affect  the deployment  of future  services.  These
changes  could cause  greater consolidation in  the telecommunications industry,
which in turn could disrupt existing customer relationships and have a  material
adverse  effect on  the Company's business,  financial condition  and results of
operations. There can be no assurance that any regulatory changes will not  have
a  material  adverse  effect  on  the demand  for  the  UMC  system. Uncertainty
regarding future policies combined with emerging new competition may also affect
the demand for telecommunications products such as the UMC system. See "Business
- -- Compliance with Regulatory and Industry Standards."
 
    RISKS ASSOCIATED WITH POTENTIAL ACQUISITIONS.   An important element of  the
Company's  strategy is to review acquisition prospects that would complement its
existing  product  offerings,  augment  its  market  coverage  or  enhance   its
technological  capabilities or  that may  otherwise offer  growth opportunities.
While the  Company  has no  current  agreements or  negotiations  underway  with
respect  to any  such acquisitions,  the Company  recently acquired  a partner's
interest in one of  its joint ventures and  may make additional acquisitions  of
businesses,  products or technologies in the  future. Future acquisitions by the
Company could result in potentially dilutive issuances of equity securities, the
incurrence of debt and contingent liabilities and amortization expenses  related
to goodwill and other intangible assets, any of which could materially adversely
affect  the Company's  business, financial  condition and  results of operations
and/or the price  of the  Company's Common Stock.  Acquisitions entail  numerous
risks,  including  difficulties  in  the  assimilation  of  acquired operations,
technologies and products, diversion of management's attention to other business
concerns, risks of entering markets in which the Company has no or limited prior
experience and potential loss  of key employees  of acquired organizations.  The
Company's  management has no experience  in assimilating acquired organizations.
No assurance can  be given  as to  the ability  of the  Company to  successfully
integrate  any  businesses, products,  technologies or  personnel that  might be
acquired in the future,  and the failure of  the Company to do  so could have  a
material  adverse  effect on  the  Company's business,  financial  condition and
results of operations. See "Use of Proceeds."
 
    MANAGEMENT'S DISCRETION AS TO USE OF UNALLOCATED NET PROCEEDS.  The  Company
has  designated only limited specific uses for the net proceeds from the sale of
Common  Stock  described  in  this  Prospectus.  The  Company  expects  to   use
approximately  $14.8 million of  the net proceeds to  repay indebtedness and the
remainder  for   general   corporate  purposes,   including   working   capital.
Consequently,  the Board  of Directors and  management of the  Company will have
broad discretion in allocating a significant portion of the net proceeds of this
offering. See "Use of Proceeds."
 
    CONTROL OF  THE  COMPANY; ANTI-TAKEOVER  EFFECTS.   Immediately  after  this
offering,  officers,  directors  and  their  affiliates  will  beneficially  own
approximately 35.4%  of the  Company's outstanding  Common Stock  (34.6% if  the
Underwriters' over-allotment option is exercised in full). Due to this ownership
position, these stockholders will be able to significantly influence the affairs
and  policies of  the Company,  the election  of directors  and the  approval or
disapproval of matters submitted to  a vote of stockholders. Furthermore,  these
stockholders may have conflicts of interest with other stockholders with respect
to  the affairs  and policies  of the  Company. The  Company is  also subject to
certain provisions of  Delaware law  which could  have the  effect of  delaying,
deterring  or preventing a  change in control of  the Company, including Section
203 of the
 
                                       10
<PAGE>
Delaware General Corporation  Law, which prohibits  a Delaware corporation  from
engaging  in  any business  combination with  any  interested stockholder  for a
period of three years from the date the person became an interested  stockholder
unless  certain conditions  are met. In  addition, the  Company's certificate of
incorporation and  bylaws  contain  certain  provisions  that  could  discourage
potential  takeover attempts and make more difficult attempts by stockholders to
change management. The  Company's Board  of Directors is  classified into  three
classes  of directors serving staggered, three-year terms and has the authority,
without action by the Company's stockholders, to fix the rights and  preferences
and  issue shares of the  Preferred Stock, and to  impose various procedural and
other requirements that could make it more difficult for stockholders to  effect
certain  corporate actions. The Company's  certificate of incorporation provides
that directors may be  removed only by  the affirmative vote  of the holders  of
two-thirds  of the shares of capital stock  entitled to vote. Any vacancy on the
board of directors may be filled only by vote of the majority of directors  then
in office. Further, the Company's certificate of incorporation provides that any
"Business  Combination" (as  therein defined)  requires the  affirmative vote of
two-thirds of the shares  entitled to vote, voting  together as a single  class.
These   provisions,  and  certain   other  provisions  of   the  certificate  of
incorporation which may have the effect of delaying proposed stockholder actions
until the  next annual  meeting  of stockholders,  together with  the  ownership
position  of the officers, directors and their affiliates, could have the effect
of delaying or preventing a tender offer for the Company's Common Stock or other
changes of control or  management of the Company,  which could adversely  affect
the  market price  of the  Company's Common  Stock. See  "Description of Capital
Stock."
 
   
    ABSENCE OF PUBLIC MARKET AND POSSIBLE  VOLATILITY OF STOCK PRICE.  Prior  to
this  offering, there has been no public  market for the Common Stock. There can
be no assurance that, following this offering, a regular trading market for  the
Common Stock will develop or be sustained. The initial public offering price was
determined by negotiations between the Company and the Underwriters and will not
necessarily reflect the market price of the Common Stock after the offering. See
"Underwriters."  The  market  price of  the  Common  Stock could  be  subject to
significant fluctuations  in  response  to  variations  in  quarterly  operating
results,  changes in analysts' earnings estimates, announcements of new products
and innovations by  the Company or  its competitors, general  conditions in  the
telecommunications  equipment industry and other factors. In addition, the stock
market in recent  years has  experienced extreme price  and volume  fluctuations
that  often have been unrelated or disproportionate to the operating performance
of companies. These broad fluctuations may adversely affect the market price  of
the Common Stock.
    
 
   
    IMMEDIATE  AND SUBSTANTIAL DILUTION.  Purchasers of the Common Stock offered
hereby will suffer an immediate and substantial dilution of $20.51 per share. To
the extent outstanding  options and  warrants to purchase  the Company's  Common
Stock are exercised, there will be further dilution. See "Dilution."
    
 
    SHARES ELIGIBLE FOR FUTURE SALE.  Sales of a substantial number of shares of
Common Stock in the public market following this offering could adversely affect
the  market price for the Company's Common Stock. The number of shares of Common
Stock available for sale in the  public market is limited by restrictions  under
the  Securities  Act of  1933, as  amended (the  "Securities Act"),  and lock-up
agreements under which the  holders of such  shares have agreed  not to sell  or
otherwise dispose of any of their shares for a period of 180 days after the date
of  this Prospectus without  the prior written  consent of Morgan  Stanley & Co.
Incorporated or the Company, as the case  may be. However, Morgan Stanley &  Co.
Incorporated  may, or the Company  may with the consent  of Morgan Stanley & Co.
Incorporated in its sole discretion and at any time without notice, release  all
or  any portion of the securities subject  to lock-up agreements. As a result of
these restrictions, based on shares outstanding  and options granted as of  June
30, 1996, the following shares of Common Stock will be eligible for future sale.
On  the  date of  this Prospectus,  no  shares other  than the  4,500,000 shares
offered hereby will be eligible for sale.  Beginning 180 days after the date  of
this  Prospectus, an additional 19,403,743 shares  will become eligible for sale
in  the  public  market  upon  expiration  of  lock-up  agreements,  subject  to
compliance  with the provisions of Rule 144 adopted under the Securities Act. In
addition, at various times after 180 days after the date of this Prospectus,  an
additional  5,383,204 shares will become eligible  for sale in the public market
upon expiration of their respective two-year holding periods, subject to certain
volume and resale restrictions set forth  in Rule 144. In addition, the  Company
expects  to file a  registration statement on  Form S-8 with  the Securities and
Exchange Commission (the "Commission")
 
                                       11
<PAGE>
   
shortly after  this  offering  to  register 8,675,676  shares  of  Common  Stock
reserved  for issuance under the Company's Employee Stock Purchase Plan and 1996
Stock Incentive Plan. Of such shares, 4,076,918 shares subject to stock  options
outstanding  under  the  1996  Stock  Incentive  Plan  are  subject  to  lock-up
agreements and  will  be eligible  for  sale  upon expiration  of  such  lock-up
agreements  180 days after the date of this Prospectus. In addition, the Company
has agreed to restrict the transfer  of the remaining 3,098,758 shares that  are
issued  pursuant to exercise  of options granted under  the 1996 Stock Incentive
Plan for a period of 180 days  after the date of this Prospectus. The  remaining
1,500,000  shares subject to options under the Employee Stock Purchase Plan will
be eligible  for  sale  upon  exercise  and  upon  filing  of  the  registration
statement.  As  of June  30, 1996  there were  outstanding warrants  to purchase
5,135,080  shares  of  Common  Stock.   These  warrants  contain  net   exercise
provisions.  Accordingly, any shares  issued upon net  exercise will be eligible
for sale immediately upon expiration of lock-up agreements pursuant to Rule 144.
In addition, the holders of approximately 20,679,023 shares of Common Stock  and
warrants to purchase approximately 5,135,080 shares of Common Stock have certain
rights to require the Company to register those shares under the Securities Act.
If  such holders, by exercising their  demand registration rights, cause a large
number of shares  to be registered  and sold  in the public  market, such  sales
could  have a  material adverse  effect on  the market  price for  the Company's
Common Stock. If  the Company were  required to include  in a  Company-initiated
registration  shares  held by  such holders  pursuant to  the exercise  of their
piggyback registration rights,  such sales  may have  an adverse  effect on  the
Company's  ability to raise needed capital.  See "Description of Capital Stock,"
"Shares Eligible for Future Sale" and "Underwriters."
    
 
                                       12
<PAGE>
                                  THE COMPANY
 
    Advanced Fibre  Communications,  Inc.  ("AFC"  or  the  "Company")  designs,
develops,  manufactures,  markets  and supports  the  Universal  Modular Carrier
1000-TM- (the  "UMC"  system),  a  cost-effective,  multi-feature  digital  loop
carrier  system developed  to serve small  line-size markets.  The Company's UMC
system is  designed to  enable telephone  companies, cable  companies and  other
service  providers to connect subscribers to the central office switch for voice
and data communications over copper wire,  fiber optic cable, coaxial cable  and
analog  radio networks.  The Company  believes that the  UMC system  is the only
digital  loop  carrier  that  can  operate  simultaneously  over  a  variety  of
transmission  media.  The UMC  system meets  the service  needs of  domestic and
international subscribers,  including  plain  old  telephone  service  ("POTS"),
universal  voice grade service ("UVG") and high speed digital data service. ISDN
capability is currently in beta testing, and the Company believes the UMC system
will be capable of providing  asynchronous and synchronous data channel  service
("ADU"  and  "SDU") in  the  near future.  Through  a relationship  with Tellabs
Operations, Inc. ("Tellabs"), AFC has developed the capability to deliver  these
same services over cable TV networks.
 
    Although  urban  markets have  experienced the  greatest initial  demand for
additional  lines  and  high-speed  telecommunications  services,  the   Company
believes  that demand  for these  services is  increasing in  rural and suburban
markets as well.  The Company  also believes,  however, that  telecommunications
service  providers  in suburban  and  rural markets  generally  do not  have the
resources to  completely replace  existing copper  networks and  therefore  must
upgrade to fiber in incremental steps. These incremental infrastructure upgrades
result  in hybrid networks containing both  copper and fiber transmission lines.
In addition,  worldwide demand  for POTS  and, to  a lesser  extent, high  speed
telecommunications services, is creating the need for significant infrastructure
investments  to  increase the  effective  capacity of  existing  copper, replace
deteriorating copper and  provide services in  new areas. As  telecommunications
service  providers upgrade to fiber technology, deploy new networks and plan for
future subscriber  services,  they must  determine  how to  ensure  a  seamless,
cost-effective  connection between copper and  fiber facilities within the local
loop.
 
    The UMC system is easily scalable from six to 672 lines through the addition
of plug-in components. Utilizing a single  platform and a variety of line  cards
supporting  specific services, the UMC system is capable of providing a range of
voice and data  services. In  addition, the  UMC system  can be  installed in  a
variety of network configurations to support the varying geographic distribution
of  subscriber  bases. The  Company has  designed  the UMC  system to  require a
minimum number of common control units to support transmission over a variety of
media and  the delivery  of more  advanced services  and features  by  telephone
companies.  Thus, the UMC  system offers a cost-effective  solution to the small
line-size market with a wide variety of features and advanced services.
 
    The UMC  system  has  been  sold to  more  than  350  independent  telephone
companies  in the  United States, is  being initially deployed  by Ameritech and
GTE, and is in laboratory or field trials at the following RBOCs: Pacific  Bell,
BellSouth  and U.S. West. The Company has  also sold the UMC system to telephone
companies in France, Hong  Kong, Canada, Mexico,  the Netherlands Antilles,  the
Dominican  Republic  and  China.  The UMC  system  is  distributed  and serviced
worldwide through  a  direct  sales  force in  the  United  States  and  through
distributors and agents in international markets.
 
    The Company was incorporated in California in May 1992 and reincorporated in
Delaware  in  September  1995.  The Company's  principal  executive  offices are
located at 1445 McDowell  Boulevard North, Petaluma,  California 94954, and  the
telephone number at that address is (707) 794-7700.
 
                                       13
<PAGE>
                                USE OF PROCEEDS
 
   
    The  net proceeds to  the Company from  the sale of  the 4,500,000 shares of
Common Stock offered by the Company hereby will be approximately $103.4  million
($119.1  million if the over-allotment option granted to the Underwriters by the
Company is exercised in  full), after deducting  the underwriting discounts  and
commissions  and estimated offering expenses. A portion of the net proceeds will
be used (i) to repay the outstanding balance on the Company's revolving line  of
credit  (approximately $7.7  million as of  the date of  this Prospectus), which
expires in November 1996  and bears interest  at the prime  rate plus 0.50%  per
annum  and (ii)  to repay  the outstanding  balance on  the Company's  term loan
(approximately $7.1 million), which  is due in January  1997, bears interest  at
5.75%  per annum and  requires compensating balances  totaling $4.0 million. The
funds borrowed under the revolving line of credit were used for working  capital
purposes,  and the funds borrowed  under the term loan were  used to pay in full
all cash amounts owed to DSC under the settlement agreement entered into in June
1996. See "Business --  Legal Proceedings" and Note  9 of Notes to  Consolidated
Financial  Statements. The  Company expects  to use  the remaining  proceeds for
general  corporate   purposes,  including   the  funding   of  working   capital
requirements.  Pending such  uses, the Company  will invest the  net proceeds of
this offering in investment-grade, interest-bearing securities.
    
 
    From time to time, the Company may evaluate opportunities to enter into  new
strategic relationships, joint ventures, potential acquisitions or other similar
transactions  and  may  use  a  portion  of  the  proceeds  to  enter  into such
transactions. There are no present understandings or agreements with respect  to
any  such transaction, and there can be no assurance that the Company will enter
into any such arrangements.
 
                                DIVIDEND POLICY
 
    The Company has never declared or paid cash dividends on its capital  stock.
The  Company currently intends to retain all of its earnings, if any, for use in
its  business  and  does  not  anticipate  paying  any  cash  dividends  in  the
foreseeable  future.  In  addition,  the  Company's  revolving  line  of  credit
agreement requires the prior consent of the bank before payment of dividends  by
the Company.
 
                                       14
<PAGE>
                                 CAPITALIZATION
 
   
    The   following  table  sets  forth   the  short-term  bank  borrowings  and
capitalization of the Company (i) at June 30, 1996, (ii) on a pro forma basis to
give effect to the July 1996 increase  in short-term bank borrowings to pay  the
DSC  settlement and the conversion of  all outstanding shares of Preferred Stock
into Common  Stock and  the authorization  of 5,000,000  shares of  undesignated
Preferred Stock upon the closing of this offering, and (iii) such pro forma data
as  adjusted to give  effect to the sale  by the Company  of 4,500,000 shares of
Common  Stock  (after  deducting  underwriting  discounts  and  commissions  and
estimated  offering expenses) and the application  of the estimated net proceeds
therefrom.
    
 
   
<TABLE>
<CAPTION>
                                                                                         JUNE 30, 1996
                                                                              ------------------------------------
                                                                                ACTUAL     PRO FORMA   AS ADJUSTED
                                                                              ----------  -----------  -----------
                                                                               (IN THOUSANDS, EXCEPT SHARE DATA)
<S>                                                                           <C>         <C>          <C>
Short-term bank borrowings (1)..............................................  $    9,700   $  16,806    $  --
                                                                              ----------  -----------  -----------
                                                                              ----------  -----------  -----------
Redeemable Convertible Preferred Stock, $.01 par value; actual -- 35,565,816
 shares authorized, 17,231,204 shares issued and outstanding; pro forma and
 as adjusted -- no shares authorized, issued and outstanding (2)............  $   39,317   $  --        $  --
                                                                              ----------  -----------  -----------
Stockholders' equity (deficit):
  Preferred Stock, $.01 par value; actual -- no shares authorized, issued
   and outstanding; pro forma and as adjusted -- 5,000,000 shares
   authorized, no shares issued and outstanding.............................      --          --           --
  Common Stock, $.01 par value; actual -- 84,654,184 shares authorized,
   6,069,484 shares issued and outstanding; pro forma -- 100,000,000 shares
   authorized, 24,786,947 shares issued and outstanding; as adjusted --
   29,286,947 shares issued
   and outstanding (3)......................................................          61         248          293
Additional paid-in capital..................................................       6,806      45,936      149,316
Notes receivable from stockholders..........................................        (176)       (176)        (176)
Accumulated deficit.........................................................     (14,932)    (14,932)     (14,932)
                                                                              ----------  -----------  -----------
  Total stockholders' equity (deficit)......................................      (8,241)     31,076      134,501
                                                                              ----------  -----------  -----------
      Total capitalization..................................................  $   31,076   $  31,076    $ 134,501
                                                                              ----------  -----------  -----------
                                                                              ----------  -----------  -----------
</TABLE>
    
 
- ---------
(1) Pro forma short-term bank borrowings  does not give effect to the  repayment
    by  the Company in  August 1996 of $2.0  million of outstanding indebtedness
    under the Company's revolving bank line.
 
(2) See Note 8 of Notes to Consolidated Financial Statements.
 
(3) Excludes 7,175,676 shares  of Common Stock reserved  for issuance under  the
    Company's  stock  option plans,  under which  options to  purchase 4,076,918
    shares were outstanding as of June  30, 1996, and 1,500,000 shares  reserved
    for issuance under the Company's Employee Stock Purchase Plan. Also excludes
    5,135,080  shares  of Common  Stock reserved  for  issuance pursuant  to the
    exercise of warrants outstanding  as of June 30,  1996. See ``Management  --
    Stock  Incentive  Plan,"  ``  -- Employee  Stock  Purchase  Plan," ``Certain
    Transactions" and ``Description of Capital Stock."
 
                                       15
<PAGE>
                                    DILUTION
 
   
    The pro forma net  tangible book value  of the Company as  of June 30,  1996
(after  giving effect to  the conversion of all  outstanding shares of Preferred
Stock into shares of Common Stock) would  have been $28.2 million, or $1.14  per
share  of Common Stock. Pro forma net tangible  book value per share is equal to
the Company's total tangible assets less  its total liabilities, divided by  the
total  number  of shares  of Common  Stock  outstanding (assuming  the automatic
conversion upon  the closing  of  this offering  of  all outstanding  shares  of
Preferred Stock into shares of Common Stock). After giving effect to the sale of
4,500,000  shares of Common Stock offered by the Company hereby (after deducting
underwriting discounts and commissions and estimated offering expenses), and the
receipt of the estimated  net proceeds therefrom, the  as adjusted net  tangible
book value of the Company as of June 30, 1996 would have been $131.6 million, or
$4.49  per share. This represents an immediate increase in the net tangible book
value of $3.35 per share to the existing stockholders and an immediate  dilution
of  $20.51 per share to new investors  purchasing shares of Common Stock in this
offering. The following table illustrates this per share dilution:
    
 
   
<TABLE>
<S>                                                                   <C>        <C>
Initial public offering price per share.............................             $   25.00
  Pro forma net tangible book value per share as of June 30, 1996...  $    1.14
  Increase per share attributable to new investors..................       3.35
                                                                      ---------
As adjusted net tangible book value per share after the offering....                  4.49
                                                                                 ---------
Dilution per share to new investors.................................             $   20.51
                                                                                 ---------
                                                                                 ---------
</TABLE>
    
 
   
    The following table summarizes on  a pro forma basis,  as of June 30,  1996,
the  number of shares of  Common Stock purchased from  the Company (assuming the
automatic conversion upon the closing of this offering of all outstanding shares
of Preferred Stock into shares of Common Stock), the total consideration paid to
the Company and the average price per share paid by existing stockholders and by
the investors  purchasing  shares  of  Common Stock  in  this  offering  (before
deducting   estimated  underwriting  discounts  and  commissions  and  estimated
offering expenses):
    
 
   
<TABLE>
<CAPTION>
                                                     SHARES PURCHASED           TOTAL CONSIDERATION
                                                 -------------------------  ---------------------------    PER SHARE
                                                    NUMBER       PERCENT        AMOUNT        PERCENT    AVERAGE PRICE
                                                 ------------  -----------  --------------  -----------  -------------
<S>                                              <C>           <C>          <C>             <C>          <C>
 
Existing stockholders..........................    24,786,947       84.6%   $   50,103,000       30.8%     $    2.02
New stockholders...............................     4,500,000       15.4       112,500,000       69.2          25.00
                                                 ------------      -----    --------------      -----
Total..........................................    29,286,947      100.0%   $  162,603,000      100.0%
                                                 ------------      -----    --------------      -----
                                                 ------------      -----    --------------      -----
</TABLE>
    
 
    The foregoing analysis is  based on the number  of shares outstanding as  of
June  30,  1996, and  excludes  7,175,676 shares  of  Common Stock  reserved for
issuance under the Company's stock option plans, under which options to purchase
4,076,918 shares were  outstanding as  of June  30, 1996,  and 1,500,000  shares
reserved  for issuance  under the  Company's Employee  Stock Purchase  Plan. The
analysis also excludes 5,135,080  shares of Common  Stock reserved for  issuance
pursuant  to  the exercise  of warrants  outstanding  as of  June 30,  1996. See
``Management --  Stock  Incentive Plan,"  ``--  Employee Stock  Purchase  Plan,"
``Certain  Transactions" and ``Description of Capital Stock." To the extent that
options and warrants are exercised in the future, there will be further dilution
to new investors.
 
                                       16
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
    The following  selected  consolidated  financial  data  should  be  read  in
conjunction  with  the  Company's consolidated  financial  statements  and notes
thereto and  the  discussion under  ``Management's  Discussion and  Analysis  of
Financial  Condition  and  Results  of Operations"  included  elsewhere  in this
Prospectus. The consolidated statement  of operations data  for the years  ended
December  31, 1993,  1994 and  1995 and  consolidated balance  sheet data  as of
December 31, 1994  and 1995 are  derived from financial  statements, which  have
been  audited by KPMG Peat Marwick LLP, independent auditors, included elsewhere
in this Prospectus. The  balance sheet data  as of December  31, 1993 have  been
derived  from audited financial statements not  included in this Prospectus. The
consolidated statement of operations  data for the period  from May 29, 1992  to
December  31, 1992  and balance  sheet data  as of  December 31,  1992 have been
derived from unaudited financial  statements that are  not contained herein  but
which  reflect, in management's  opinion, all adjustments,  consisting of normal
recurring adjustments, necessary for a fair presentation thereof. The  statement
of  operations data  for the  six months ended  June 30,  1995 and  1996 and the
actual and pro forma balance  sheet data as of June  30, 1996 have been  derived
from  unaudited  interim  financial statements  contained  elsewhere  herein and
reflect, in management's  opinion, all  adjustments, consisting  only of  normal
recurring   adjustments,  necessary  for  a  fair  presentation  thereof.  These
historical results are not necessarily indicative of the results to be  expected
in the future.
 
<TABLE>
<CAPTION>
                                                         INCEPTION (MAY
                                                          29, 1992) TO                                       SIX MONTHS ENDED
                                                          DECEMBER 31,        YEAR ENDED DECEMBER 31,            JUNE 30,
                                                         ---------------  -------------------------------  --------------------
                                                              1992          1993       1994       1995       1995     1996 (1)
                                                         ---------------  ---------  ---------  ---------  ---------  ---------
                                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                      <C>              <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues...............................................     $     275     $     620  $  18,802  $  54,287  $  19,245  $  53,772
Cost of revenues.......................................            38         2,574     14,124     33,469     11,921     31,058
                                                                -----     ---------  ---------  ---------  ---------  ---------
  Gross profit (loss)..................................           237        (1,954)     4,678     20,818      7,324     22,714
                                                                -----     ---------  ---------  ---------  ---------  ---------
Operating expenses:
  Research and development.............................           622         2,044      2,867      5,730      2,264      5,894
  Selling, general and administrative..................           266         2,509      5,051      9,660      3,962      7,901
  DSC litigation costs.................................        --               784      4,551      1,623        750     18,947
                                                                -----     ---------  ---------  ---------  ---------  ---------
    Total operating expenses...........................           888         5,337     12,469     17,013      6,976     32,742
                                                                -----     ---------  ---------  ---------  ---------  ---------
Operating income (loss)................................          (651)       (7,291)    (7,791)     3,805        348    (10,028)
Equity in loss of joint venture........................        --            --         --         (1,516)      (542)      (167)
Other income (expense), net............................           (25)       --             26        149         41         66
                                                                -----     ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes......................          (676)       (7,291)    (7,765)     2,438       (153)   (10,129)
Income taxes (benefit).................................        --            --         --             97          2     (8,588)
                                                                -----     ---------  ---------  ---------  ---------  ---------
Net income (loss)......................................     $    (676)    $  (7,291) $  (7,765) $   2,341  $    (155) $  (1,541)
                                                                -----     ---------  ---------  ---------  ---------  ---------
                                                                -----     ---------  ---------  ---------  ---------  ---------
Pro forma net income (loss) per share (2)..............                                         $    0.09  $   (0.01) $   (0.06)
                                                                                                ---------  ---------  ---------
                                                                                                ---------  ---------  ---------
Shares used in per share computations (2)..............                                            27,329     23,800     24,711
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                              JUNE 30, 1996
                                                                          DECEMBER 31,                    ----------------------
                                                        ------------------------------------------------                 PRO
                                                             1992          1993       1994       1995      ACTUAL     FORMA (3)
                                                        ---------------  ---------  ---------  ---------  ---------  -----------
                                                                                     (IN THOUSANDS)
<S>                                                     <C>              <C>        <C>        <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents.............................     $  --         $     450  $   3,858  $  11,118  $  10,885      10,885
Working capital.......................................            77           466      6,809     18,770     23,720      23,720
Total assets..........................................           458         3,787     14,884     36,680     67,299      67,299
Redeemable convertible preferred stock................        --             9,152     23,546     37,777     39,317      --
Total stockholders' equity (deficit)..................          (661)       (7,952)   (15,706)   (15,765)    (8,241)     31,076
</TABLE>
 
- ------------
(1)  Includes a charge  of $15.8 million in  the quarter ended  June 30, 1996 to
    reflect a cash payment  of $3.0 million paid  in June 1996, additional  cash
    payments of $8.5 million (subject to reduction to present value in the event
    of  prepayment) payable through  2001 and the issuance  of 719,424 shares of
    Common Stock to DSC in settlement of outstanding litigation. See  ``Business
    --  Legal Proceedings."  Without this charge,  operating income  for the six
    months ended June 30, 1996 would have been $5.8 million.
 
(2) See Note 1 of Notes to Consolidated Financial Statements for an  explanation
    of the determination of the number of shares used in computing pro forma net
    income (loss) per share.
 
(3)  Gives effect to the conversion of all outstanding shares of Preferred Stock
    into Common Stock, which will occur automatically upon the completion of the
    offering. See Notes 7 and 9 of Notes to Consolidated Financial Statements.
 
                                       17
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
    THE  FOLLOWING MANAGEMENT'S  DISCUSSION AND ANALYSIS  OF FINANCIAL CONDITION
AND RESULTS  OF OPERATIONS  CONTAINS  FORWARD-LOOKING STATEMENTS  WHICH  INVOLVE
RISKS  AND UNCERTAINTIES. THE  COMPANY'S ACTUAL RESULTS  COULD DIFFER MATERIALLY
FROM THOSE  ANTICIPATED  IN THESE  FORWARD-LOOKING  STATEMENTS AS  A  RESULT  OF
CERTAIN  FACTORS, INCLUDING THOSE SET FORTH  UNDER ``RISK FACTORS" AND ELSEWHERE
IN THIS PROSPECTUS.
 
OVERVIEW
 
    AFC designs, develops, manufactures, markets and supports the UMC system,  a
cost-effective,  multi-feature digital  loop carrier  system developed  to serve
small line-size  markets.  The  Company's  UMC  system  is  designed  to  enable
telephone  companies,  cable companies  and other  service providers  to connect
subscribers to the central office switch for voice and data communications  over
copper,  fiber,  coaxial  cable  and  analog  radio  networks.  The  Company was
incorporated in May 1992  and was in the  initial startup and development  phase
through  December 1993. The Company began shipping  the UMC in January 1994 and,
accordingly, has a limited operating history.
 
    The  Company   has  incurred   substantial  expenditures   related  to   the
development,  manufacturing startup and marketing of the UMC system. As a result
of these expenditures, combined  with $25.9 million  of expenses and  settlement
amounts  recorded  in  connection with  certain  litigation with  DSC  which was
settled in June 1996, the Company had an accumulated deficit of $14.9 million as
of June  30, 1996.  Although the  Company first  achieved profitability  in  the
second quarter of 1995, it recorded a net loss in the second quarter of 1996 due
to  charges associated with the settlement of litigation with DSC, and there can
be no assurance that the Company  will sustain or increase its profitability  in
the future.
 
    The Company currently derives substantially all of its revenues from the UMC
system  and expects  that this  concentration will  continue in  the foreseeable
future. As a  result, any  decrease in  the overall level  of sales  of, or  the
prices  for,  the  UMC  system due  to  product  enhancements,  introductions or
announcements by the Company's competitors, a decline in the demand for the  UMC
system,  product obsolescence or any other  reason would have a material adverse
effect on the Company's business, financial condition and results of operations.
The Company derives a minor amount  of revenue from license fees generated  from
the  Company's  various  strategic  relationships.  Support  revenues  have been
negligible since most systems shipped to date remain under the Company's initial
two-year product warranty period.
 
    The Company sells its products worldwide, primarily through its direct sales
force  in  the  domestic  market,   and  through  distributors  and  agents   in
international markets. In April 1994, the Company and a third party entered into
a  joint venture, pursuant to which a Hong Kong-based subsidiary was formed, 49%
of which was owned by  the Company and the remaining  51% of which was owned  by
the  third party. In April 1996, the Company acquired the third party's interest
in  the  subsidiary.  As  a  result  of  this  acquisition,  the  Company  began
consolidating  the  results  of  the  Hong  Kong-based  subsidiary's  and  of  a
China-based joint venture, 60% of  which is owned by  the subsidiary and 40%  of
which  is owned by the joint venture  partner. The change in accounting from the
equity method to consolidation did not  have a material impact on the  Company's
financial  condition and results of operations.  In August 1996, the Company and
the joint venture partner agreed to liquidate the joint venture. The liquidation
is expected to occur over  the remainder of 1996 and  is not expected to have  a
material  impact on the Company's financial condition and results of operations.
See Note 2 of Notes to Consolidated Financial Statements.
 
                                       18
<PAGE>
RESULTS OF OPERATIONS
 
    The following table sets forth, for the periods indicated, the percentage of
revenues represented by  certain items reflected  in the Company's  consolidated
statements of operations:
 
<TABLE>
<CAPTION>
                                                                                                   SIX MONTHS ENDED
                                                                   YEAR ENDED DECEMBER 31,             JUNE 30,
                                                               -------------------------------  ----------------------
                                                                 1993       1994       1995       1995      1996 (1)
                                                               ---------  ---------  ---------  ---------  -----------
 
<S>                                                            <C>        <C>        <C>        <C>        <C>
Revenues.....................................................      100.0%     100.0%     100.0%     100.0%      100.0%
Cost of revenues.............................................      415.2       75.1       61.7       61.9        57.8
                                                               ---------  ---------  ---------  ---------       -----
  Gross profit (loss)........................................     (315.2)      24.9       38.3       38.1        42.2
                                                               ---------  ---------  ---------  ---------       -----
Operating expenses:
  Research and development...................................      329.7       15.2       10.6       11.8        11.0
  Selling, general and administrative........................      404.7       26.9       17.8       20.6        14.7
  DSC litigation costs.......................................      126.4       24.2        3.0        3.9        35.2
                                                               ---------  ---------  ---------  ---------       -----
    Total operating expenses.................................      860.8       66.3       31.3       36.2        60.9
                                                               ---------  ---------  ---------  ---------       -----
Operating income (loss)......................................   (1,176.0)     (41.4)       7.0        1.8       (18.6)
Equity in loss of joint venture..............................     --         --           (2.8)      (2.8)       (0.3)
Other income, net............................................     --            0.1        0.3        0.2         0.1
                                                               ---------  ---------  ---------  ---------       -----
Income (loss) before income taxes............................   (1,176.0)     (41.3)       4.5       (0.8)      (18.8)
Income taxes (benefit).......................................     --         --            0.2     --           (16.0)
                                                               ---------  ---------  ---------  ---------       -----
Net income (loss)............................................   (1,176.0)%     (41.3)%       4.3%      (0.8)%       (2.9)%
                                                               ---------  ---------  ---------  ---------       -----
                                                               ---------  ---------  ---------  ---------       -----
</TABLE>
 
- ------------
(1)  Includes a charge  of $15.8 million in  the quarter ended  June 30, 1996 to
    reflect a cash payment  of $3.0 million paid  in June 1996, additional  cash
    payments of $8.5 million (subject to reduction to present value in the event
    of  prepayment) payable through  2001 and the issuance  of 719,424 shares of
    Common Stock to DSC in  settlement of outstanding litigation. See  "Business
    -- Legal Proceedings." Without this charge, operating income as a percentage
    of revenues for the six months ended June 30, 1996 would have been 10.7%.
 
SIX MONTHS ENDED JUNE 30, 1995 AND 1996
 
    REVENUES.   Revenues increased $34.5 million, or 179%, from $19.2 million in
the first six months of 1995 to $53.8 million for the comparable period of 1996.
This significant increase was primarily the result of expansion of the Company's
customer  base  and  the  introduction  of  new  features  in  the  UMC  system.
International  revenues increased $3.2 million, or 88%, from $3.6 million in the
first six months of 1995 to $6.8 million for the comparable period of 1996,  and
represented  18.8% and  12.6% of total  revenues during  the respective periods.
International revenues have fluctuated in  absolute dollars and as a  percentage
of  total revenues, and are expected to continue to fluctuate in future periods.
ALLTEL Supply,  Inc.,  an affiliate  of  ALLTEL, a  major  independent  domestic
telephone  company, accounted for 17.9% and 15.6%  of revenues in the first half
of 1995 and 1996, respectively. No other  customer accounted for 10% or more  of
revenues  in either period. Although the Company's largest customers have varied
from period to period, the Company anticipates that its results of operations in
any given period will continue to depend to a significant extent upon sales to a
small number  of  customers.  There  can be  no  assurance  that  the  Company's
principal  customers  will  continue to  purchase  product from  the  Company at
current levels, if at all. The loss of one or more major customers could have  a
material  adverse  effect on  the  Company's business,  financial  condition and
results of operations.
 
    GROSS PROFIT.    Gross  profit  is comprised  of  revenues  less  materials,
manufacturing and warranty costs. Gross profit increased $15.4 million, or 210%,
from  $7.3 million  in the  first six  months of  1995 to  $22.7 million  in the
comparable period of 1996, and represented  gross margins of 38.1% and 42.2%  in
such  periods. The  improvement in gross  margins from  1995 to 1996  was due to
lower product costs resulting from  engineering design improvements and  greater
efficiencies achieved in purchasing and manufacturing activities associated with
higher  unit volumes. In the  future, gross margins may  fluctuate due to a wide
variety of factors, including: the timing and size of orders which are  received
and  can be shipped in  a quarter; the availability  of adequate supplies of key
components and assemblies and the adequacy of manufacturing
 
                                       19
<PAGE>
capacity; the Company's ability to introduce new products and technologies on  a
timely  basis; the timing  of new product introductions  or announcements by the
Company or its competitors;  price competition; unit  volume; customer mix;  and
the mix between domestic and international sales.
 
    RESEARCH  AND DEVELOPMENT.  Research and development expenses increased $3.6
million, or 160%,  from $2.3 million  in the first  six months of  1995 to  $5.9
million  in the same period  in 1996. As a  percentage of revenues, research and
development expenses decreased  from 11.8% in  the first six  months of 1995  to
11.0%  in the comparable period of  1996, reflecting the increased revenue base.
The  increase  in  absolute  dollars  resulted  primarily  from  the  hiring  of
additional  personnel and  the use  of outside  services for  certain additional
development efforts  in the  first half  of  1996. The  number of  employees  in
research  and development increased from 49 as of June 30, 1995 to 98 as of June
30,  1996.  The  increase  in   research  and  development  expenses  was   also
attributable to higher costs for material and test equipment used to develop and
test   new  products  and  features.  The  Company  expects  that  research  and
development expenditures generally will continue to increase in absolute dollars
to support the continued development of new features and product cost  reduction
efforts. All research and development costs have been expensed as incurred.
 
    SELLING,  GENERAL AND  ADMINISTRATIVE.  Selling,  general and administrative
expenses increased $3.9  million, or  99%, from $4.0  million in  the first  six
months of 1995 to $7.9 million in the comparable period of 1996. As a percentage
of  revenues, selling,  general and administrative  expenses fell  from 20.6% of
revenues in the first six months of 1995 to 14.7% of revenues in the  comparable
period  of  1996.  Employee costs  in  the  sales and  marketing  area increased
significantly from period to period reflecting  the hiring of new employees  and
commissions  earned by the Company's  sales force as a  result of higher revenue
levels. Outside  service  costs also  increased  in 1996  due  to costs  of  the
third-party  support organization that  provides first-line technical assistance
and post-sales  support  to the  Company's  customers and  commissions  paid  to
international  sales representatives. The Company also increased its advertising
and trade  show  participation  in 1996.  General  and  administrative  expenses
increased  from the first six months of 1995 as compared with the same period in
1996 due to increases  in the Company's administrative  staff and higher  travel
costs  associated with the  Company's activities in  its foreign operations. The
Company anticipates incurring additional general and administrative expenses  as
a  result  of becoming  a public  company, and  additional selling,  general and
administrative expenses as a result of anticipated expansion of its operations.
 
    DSC LITIGATION COSTS.  Litigation  expenses incurred in connection with  the
DSC  litigation increased $18.2 million from $750,000 in the first six months of
1995 to  $18.9  million in  the  comparable period  of  1996. The  increase  was
primarily  attributable  to  the $15.8  million  charge recorded  in  the second
quarter of 1996  in connection with  final settlement of  the DSC litigation  in
such  period.  See  "Business --  Legal  Proceedings"  and Note  9  of  Notes to
Consolidated Financial Statements.
 
    EQUITY IN LOSS OF JOINT VENTURE.  During each quarter of 1995 and the  first
quarter  of 1996,  the Company  made advances  to a  joint venture  in which the
Company had a 50% ownership interest. In April 1995, the Company made a loan  of
$1.0 million to the joint venture. During the first six months of 1995 and 1996,
the  Company recorded its  proportionate share of the  joint venture's losses to
the extent of  the loan and  advances. As  a result, the  loan and  intercompany
receivables  were reduced to zero on the Company's balance sheets as of December
31, 1995 and June 30,  1996. In the first quarter  of 1996, the Company and  the
joint  venture partner entered  into discussions to  dissolve the joint venture.
Under the present  draft of  the agreement to  dissolve the  joint venture,  the
joint  venture partner  would receive a  development license  and certain market
rights, principally in the  cable television market, in  exchange for which  the
Company   would  receive  royalties,  OEM  revenues  on  certain  products,  and
reimbursement of all loans and advances made to the joint venture, which totaled
approximately $1.7 million at June 30, 1996. If a definitive agreement is signed
on these proposed terms, the Company will record the reimbursement of loans  and
advances as a gain in the period in which the agreement is signed.
 
    INCOME  TAXES (BENEFIT).  An income tax benefit of $8.6 million was recorded
in the first six  months of 1996  to reflect the benefit  of the DSC  litigation
settlement  and the  decrease in  the valuation  allowance recorded  against the
Company's deferred tax assets. As of June 30, 1996, the Company has recorded  no
valuation  allowance against its deferred tax assets because management believes
such assets are realizable. In future  periods, the Company anticipates it  will
record  income taxes at an effective rate that approximates the combined federal
and state statutory rate.
 
                                       20
<PAGE>
YEARS ENDED DECEMBER 31, 1993, 1994, AND 1995
 
    REVENUES.  Revenues were $620,000, $18.8 million and $54.3 million in  1993,
1994  and 1995, respectively. Revenues in 1993 were primarily from license fees.
The Company  began shipping  the UMC  1000 in  January 1994.  The revenue  level
achieved in 1994 reflected initial market acceptance of the Company's product by
independent  telephone companies  in the  United States, as  well as  sales to a
distributor in Mexico. The 189% increase in revenues in 1995 compared with  1994
resulted  from growth in system  sales of the UMC  to an expanded customer base.
During 1994, shipments to PTI,  a major independent domestic telephone  company,
accounted  for approximately 27.0%  of revenues. In  1995, the Company's largest
customer, ALLTEL Supply, Inc., accounted for 15.7% of revenues. No other  single
customer  accounted for 10% or  more of revenues in  1994 or 1995. International
revenues increased  $3.6 million,  or 99%  from  $3.6 million  in 1994  to  $7.2
million  in 1995, and represented 19.2% and  13.2% of revenues in 1994 and 1995,
respectively.
 
    GROSS PROFIT  (LOSS).   Gross profit  increased to  $4.7 million  and  $20.8
million in 1994 and 1995, respectively, and gross margins increased to 24.9% and
38.3%  in 1994  and 1995,  respectively. The  Company had  a gross  loss of $2.0
million in 1993. Gross margins  improved in 1994 and  1995 due to lower  product
costs  resulting from  engineering design improvements  and greater efficiencies
achieved in purchasing and manufacturing activities associated with higher  unit
volumes.  Gross  margins in  1993  included a  reserve  for excess  and obsolete
inventory and  inventory  adjustments  resulting from  the  installation  of  an
inventory and standard cost tracking system.
 
    RESEARCH  AND  DEVELOPMENT.   Research  and development  expenses  were $2.0
million, $2.9 million and $5.7 million in 1993, 1994 and 1995, respectively.  As
a  percentage of revenues, research and  development expenses were 329.7%, 15.2%
and 10.6%  in 1993,  1994, and  1995, respectively.  The Company  increased  its
engineering  staff to support continued  product development and cost reductions
during these periods from 24  to 38 to 63 employees  at December 31, 1993,  1994
and  1995, respectively. The decrease in  research and development expenses as a
percentage of revenues from 1993 to 1995  was the result of the Company's  rapid
growth  in revenues.  All research and  development costs have  been expensed as
incurred.
 
    SELLING, GENERAL AND  ADMINISTRATIVE.  Selling,  general and  administrative
expenses  were $2.5 million,  $5.1 million and  $9.7 million, in  1993, 1994 and
1995  respectively.  As   a  percentage  of   revenues,  selling,  general   and
administrative  expenses were  404.7%, 26.9% and  17.8% in 1993,  1994 and 1995,
respectively, reflecting the increased revenue  base. The increases in  absolute
dollars  reflect the building of the Company's domestic and international direct
sales team, investments in customer support and marketing, costs associated with
trade  shows  and   other  marketing   efforts,  expansion   of  the   Company's
administrative   staff  and  installation   of  information,  manufacturing  and
financial control systems.
 
    DSC LITIGATION COSTS.  DSC litigation costs were $784,000, $4.6 million  and
$1.6  million in 1993, 1994 and 1995, respectively. DSC litigation costs in 1993
and 1994  included reserves  for  a possible  settlement  of $500,000  and  $2.0
million,  respectively. See ``Business -- Legal Proceedings" and Note 9 of Notes
to Consolidated Financial Statements.
 
    EQUITY IN LOSS OF JOINT  VENTURE.  During 1995, the  Company made a loan  of
$1.0  million  and other  advances totaling  approximately  $516,000 to  a joint
venture in which the Company had a 50% ownership interest. In 1995, the  Company
recorded  its proportionate share of the joint venture's losses to the extent of
the loan and advances. As a  result, the loan and intercompany receivables  were
reduced to zero on the Company's balance sheet as of December 31, 1995.
 
    OTHER  INCOME, NET.  Other income was $26,000 and $149,000 in 1994 and 1995,
respectively,  and  consisted  of  interest  income  from  the  Company's   cash
investments,  net of interest expense on stockholder loans in 1993 and 1994, and
advances under the Company's bank line of credit in 1995.
 
    INCOME TAXES.  Because of operating  losses sustained in 1993 and 1994,  the
Company  did  not provide  for income  taxes  in those  periods, other  than the
minimum California state franchise tax. In fiscal 1995, the provision for income
taxes was $97,000 and consisted of  the federal alternative minimum tax and  the
California  minimum state  franchise tax.  See Note  6 of  Notes to Consolidated
Financial Statements.
 
                                       21
<PAGE>
QUARTERLY RESULTS OF OPERATIONS
 
    The following tables present  unaudited quarterly financial information  for
the  four quarters of 1995 and the first two quarters of 1996. In the opinion of
the Company's management, this  unaudited information has  been prepared on  the
same basis as the audited financial statements contained herein and includes all
adjustments  (consisting  only  of normal  recurring  adjustments)  necessary to
present fairly the information set forth therein. The operating results for  any
quarter are not necessarily indicative of results for any future period.
<TABLE>
<CAPTION>
                                                                             QUARTER ENDED
                                                  -------------------------------------------------------------------
                                                   MAR. 31,    JUNE 30,   SEPT. 30,  DEC. 31,   MAR. 31,    JUNE 30,
                                                     1995        1995       1995       1995       1996      1996 (1)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
                                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                               <C>          <C>        <C>        <C>        <C>        <C>
Revenues........................................   $   7,456   $  11,789  $  15,548  $  19,494  $  24,121  $   29,651
Cost of revenues................................       4,633       7,288      9,837     11,711     14,101      16,957
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Gross profit....................................       2,823       4,501      5,711      7,783     10,020      12,694
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Operating expenses:
  Research and development......................       1,050       1,214      1,406      2,060      2,619       3,275
  Selling, general and administrative...........       1,681       2,281      2,471      3,227      3,545       4,356
  DSC litigation costs..........................         358         392        324        549        691      18,256
                                                  -----------  ---------  ---------  ---------  ---------  ----------
      Total operating expenses..................       3,089       3,887      4,201      5,836      6,855      25,887
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Operating income (loss).........................        (266)        614      1,510      1,947      3,165     (13,193)
Other income (expense):
  Equity in loss of joint venture...............        (202)       (340)      (526)      (448)      (167)     --
  Other income (expense), net...................          26          15         (4)       112         84         (18)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Income (loss) before income taxes...............        (442)        289        980      1,611      3,082     (13,211)
Income taxes (benefit)..........................      --               2         39         56        910      (9,498)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Net income (loss)...............................   $    (442)  $     287  $     941  $   1,555  $   2,172  $   (3,713)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
                                                  -----------  ---------  ---------  ---------  ---------  ----------
 
<CAPTION>
 
                                                                      AS A PERCENTAGE OF REVENUES
                                                  -------------------------------------------------------------------
<S>                                               <C>          <C>        <C>        <C>        <C>        <C>
Revenues........................................       100.0%      100.0%     100.0%     100.0%     100.0%      100.0%
Costs of revenues...............................        62.1        61.8       63.3       60.1       58.5        57.2
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Gross profit....................................        37.9        38.2       36.7       39.9       41.5        42.8
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Operating expenses:
  Research and development......................        14.1        10.3        9.0       10.6       10.9        11.0
  Selling, general and administrative...........        22.5        19.3       15.9       16.6       14.7        14.7
  DSC litigation costs..........................         4.8         3.3        2.1        2.8        2.9        61.6
                                                  -----------  ---------  ---------  ---------  ---------  ----------
      Total operating expenses..................        41.4        33.0       27.0       29.9       28.4        87.3
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Operating income (loss).........................        (3.6)        5.2        9.7       10.0       13.1       (44.5)
Other income (expense):
  Equity in loss of joint venture...............        (2.7)       (2.9)      (3.4)      (2.3)      (0.7)     --
  Other income, net.............................         0.3         0.1     --            0.6        0.3        (0.1)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Income (loss) before income taxes...............        (5.9)        2.5        6.3        8.3       12.8       (44.6)
Income taxes (benefits).........................      --          --            0.3        0.3        3.8       (32.0)
                                                  -----------  ---------  ---------  ---------  ---------  ----------
Net income (loss)...............................        (5.9)%       2.5%       6.0%       8.0%       9.0%      (12.5)%
                                                  -----------  ---------  ---------  ---------  ---------  ----------
                                                  -----------  ---------  ---------  ---------  ---------  ----------
</TABLE>
 
- ------------
(1)  Includes a charge  of $15.8 million in  the quarter ended  June 30, 1996 to
    reflect a cash payment  of $3.0 million paid  in June 1996, additional  cash
    payments of $8.5 million (subject to reduction to present value in the event
    of  prepayment) payable through  2001 and the issuance  of 719,424 shares of
    Common Stock to DSC in  settlement of outstanding litigation. See  "Business
    -- Legal Proceedings." Without this charge, operating income for the quarter
    ended  June 30, 1996  would have been  $2.6 million, and  as a percentage of
    revenues would have been 8.8%.
 
    The Company's operating results have been, and will continue to be, affected
by a  wide variety  of  factors, some  of which  are  outside of  the  Company's
control,  that could have a  material adverse effect on  revenues and results of
operations during any particular period.  These factors include: the timing  and
size of
 
                                       22
<PAGE>
orders  which are received and can be  shipped in a quarter; the availability of
adequate  supplies  of  key  components  and  assemblies  and  the  adequacy  of
manufacturing  capacity;  the Company's  ability to  introduce new  products and
technologies on  a timely  basis; the  timing of  new product  introductions  or
announcements by the Company or its competitors; price competition; unit volume;
customer mix; and the mix between domestic and international sales.
 
    The UMC system is sold primarily to telephone companies that install the UMC
system  as part of their access  networks. Additions to those networks represent
complex engineering projects which can require from three to twelve months  from
project  conceptualization to  completion. The  UMC system  typically represents
only a portion of a given project and, therefore, the timing of product shipment
and revenue recognition is often difficult to forecast. In developing countries,
delays and  reductions  in the  planned  project  deployment can  be  caused  by
additional factors, including reductions in capital availability due to declines
in   the  local  economy,   currency  fluctuations,  priority   changes  in  the
government's budget and delays in  receiving government approval for  deployment
of the UMC system in the local loop. The Company's expenditures for research and
development,  marketing and sales, and  general and administrative functions are
based in part on future revenue projections and in the near term are  relatively
fixed.  The  Company may  be unable  to adjust  spending in  a timely  manner in
response to any unanticipated declines in revenues. Accordingly, any significant
decline in demand for  the UMC system  relative to planned  levels could have  a
material  adverse effect  on the  business, financial  condition and  results of
operations in that quarter or subsequent quarters. All of the above factors  are
difficult  to forecast,  and these or  other factors  could materially adversely
affect the Company's business, financial condition and results of operations. As
a result,  the  Company  believes  that  period-to-period  comparisons  are  not
necessarily  meaningful and should  not be relied upon  as indications of future
performance.  Fluctuations  in  the   Company's  operating  results  may   cause
volatility  in the price  of the Company's  Common Stock. Further,  it is likely
that in some future quarter the  Company's revenue or operating results will  be
below  the expectations of  public market analysts or  investors. In such event,
the market  price of  the  Company's Common  Stock  would likely  be  materially
adversely affected.
 
    The Company's customers normally install the equipment in outdoor locations.
Shipments  of the  UMC system  are subject to  the effects  of seasonality, with
fewer installation projects  scheduled for the  winter months. Accordingly,  the
Company  believes that over time this seasonality will cause its revenues in the
quarter ended March 31 to be lower than revenues in the preceding quarter  ended
December 31.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The  Company has funded  its operations since  inception primarily through a
series of preferred stock financings.  From its incorporation through  September
1995,  the  Company  completed  five  private  financings  of  equity securities
providing aggregate net  proceeds of approximately  $38.1 million. In  September
1995,  the Company  repurchased and  retired approximately  $4.2 million  of its
outstanding preferred stock.
 
    In April 1995, the Company  made a loan of $1.0  million to a joint  venture
owned  50% by the Company  which bears interest at a  rate of 5.5%. Beginning in
fiscal 1995, the Company recorded its proportionate share of the joint venture's
losses to the extent of the loan balance and advances made to the joint venture.
As a result, the loan and advances to  the joint venture were written off as  of
December  31, 1995.  In the first  quarter of  fiscal 1996, the  Company and the
joint venture partner entered  into discussions to  dissolve the joint  venture.
Under  the present  draft of  the agreement to  dissolve the  joint venture, the
Company's joint venture partner would receive a development license and  certain
market rights, principally in the cable television market, in exchange for which
the  Company  would receive  royalties, OEM  revenues  on certain  products, and
reimbursement of all loans and advances made to the joint venture, which totaled
approximately $1.7 million  as of June  30, 1996. If  a definitive agreement  is
signed  on these  proposed terms, the  Company will record  the reimbursement of
loans and advances as a gain in the period in which the agreement is signed.
 
    In April  1996, the  Company purchased  all of  the stock  outstanding in  a
49%-owned  subsidiary  that had  not  previously been  owned  by the  Company in
exchange for  220,000 shares  of  the Company's  Series  F Preferred  Stock  and
approximately $939,000 in cash.
 
                                       23
<PAGE>
    In  June 1996, as  part of the  DSC litigation settlement,  the Company paid
$3.0 million in cash and issued 719,424  shares of Common Stock to DSC. In  July
1996,  the Company  borrowed approximately $7.1  million under  a six-month term
loan with Bank  of the West.  The proceeds from  the loan were  used to pay  the
remaining  obligations  under  the  DSC litigation  settlement.  The  loan bears
interest at  a  rate  of 5.75%  and  has  a $4.0  million  compensating  balance
requirement.  The loan is due in January  1997. The Company expects to repay the
loan from the  proceeds received  from this  offering. See  ``Use of  Proceeds,"
``Business  -- Legal Proceedings," and Note 9 of Notes to Consolidated Financial
Statements.
 
    In December 1995, the Company's bank line was increased from $5.0 million to
$12.0 million. The  bank line  expires in November  1996. Under  this line,  the
Company  is able to borrow up to $12.0 million at an interest rate of prime plus
0.5%. The amount available to the Company for borrowing under the line is  based
upon  the  balance  of eligible  domestic  accounts  receivable at  the  time of
borrowing. As part of the bank line, the bank may issue letters of credit up  to
$10.0  million and foreign exchange contracts up  to $5.0 million. The bank line
requires the Company to comply with certain financial covenants. As of  December
31,  1995 and 1994,  no borrowings were  outstanding under the  bank line. As of
June 30, 1996,  a total  of $9.7  million was  outstanding under  the line,  and
$564,000  was  reserved for  forward exchange  contracts  and letters  of credit
supporting bid and performance bonds on certain international transactions.  The
Company  also has lease lines totaling $4.5 million to be used for equipment and
furniture purchases.  Approximately $1.2  million remained  available under  the
lease lines as of June 30, 1996.
 
    Cash  and  cash  equivalents totaled  $10.9  million  as of  June  30, 1996.
Included in  cash  and  cash  equivalents was  approximately  $150,000  held  as
collateral for bonds on certain contracts. Net cash used by operating activities
totaled  $7.0  million, $10.6  million  and $971,000  for  1993, 1994  and 1995,
respectively. For the six months ended June 30, 1996, net cash used by operating
activities was $7.2 million, primarily  due to increases in accounts  receivable
and inventory to support the higher sales levels.
 
    The  Company anticipates that the proceeds from this offering, together with
existing sources of liquidity and cash anticipated to be provided by operations,
will satisfy the Company's working capital requirements through the next  twelve
months.
 
                                       24
<PAGE>
                                    BUSINESS
 
    THE  FOLLOWING  BUSINESS SECTION  CONTAINS FORWARD-LOOKING  STATEMENTS WHICH
INVOLVE RISKS  AND  UNCERTAINTIES. THE  COMPANY'S  ACTUAL RESULTS  COULD  DIFFER
MATERIALLY  FROM  THOSE ANTICIPATED  IN  THESE FORWARD-LOOKING  STATEMENTS  AS A
RESULT OF CERTAIN FACTORS, INCLUDING THOSE  SET FORTH UNDER ``RISK FACTORS"  AND
ELSEWHERE IN THIS PROSPECTUS. SEE "GLOSSARY OF TERMS" ON PAGE 64 FOR DEFINITIONS
OF VARIOUS ACRONYMS AND TECHNICAL TERMS USED IN THIS PROSPECTUS.
 
COMPANY OVERVIEW
 
    Advanced Fibre Communications, Inc. designs, develops, manufactures, markets
and  supports  the  UMC  system, a  cost-effective,  multi-feature  digital loop
carrier system developed  to serve  small line-size markets.  The Company's  UMC
system  is designed  to enable  telephone companies,  cable companies  and other
service providers to connect subscribers to the central office switch for  voice
and  data communications over copper, fiber, coax and analog radio networks. The
Company believes that the UMC system is  the only digital loop carrier that  can
operate  simultaneously over  a variety  of transmission  media. The  UMC system
meets the  service needs  of domestic  and international  subscribers  including
POTS,  UVG and high speed digital data  service. ISDN capability is currently in
beta testing  and  the  Company believes  the  UMC  system will  be  capable  of
providing  ADU and SDU service  in the near future.  Through a relationship with
Tellabs Operations,  Inc.  (``Tellabs"), AFC  has  developed the  capability  to
deliver these same services over cable TV networks.
 
    The  UMC  system  has  been  sold to  more  than  350  independent telephone
companies in the  United States, is  being initially deployed  by Ameritech  and
GTE,  and is in laboratory or field trials at the following RBOCs: Pacific Bell,
BellSouth and U.S. West. The Company has  also sold the UMC system to  telephone
companies  in France, Hong Kong, Mexico, the Netherlands Antilles, the Dominican
Republic and China. The UMC system is distributed and serviced worldwide through
a direct sales force in the United States and through distributors and agents in
international markets.  See  ``-- Markets  and  Customers" and  "--  Proprietary
Rights and Licenses."
 
INDUSTRY BACKGROUND
 
    Much  of  the existing  local  loop, which  connects  the subscriber  to the
central office switch, was designed  to provide analog voice communications,  or
POTS,  over copper.  As a transmission  medium, copper  suffers from significant
signal degradation, particularly when  transmitting signals beyond 10,000  feet.
In  addition, the traditional copper infrastructure  was designed to support low
speed  telecommunications  services  and  offers  relatively  poor  transmission
quality,  especially  in  data communications  applications.  Before  the 1970s,
various solutions were  implemented to  address these  concerns; however,  these
solutions   were  generally   costly  to   maintain  and   resulted  in  complex
architectures. In  the early  1970s,  to decrease  the  cost and  complexity  of
extending  service  beyond  10,000  feet  from  the  central  office,  telephone
companies began to deploy digital loop carriers (``DLCs"), which convert  analog
signals  into  digital bit  streams  for transmission  to  and from  the central
office. The resulting  improved signal  quality enabled  telephone companies  to
increase transmission distances from the central office to the customer.
 
    Advancements  in digital technology have  enabled central office switches to
increase by tenfold the  number of lines served.  While these advancements  have
permitted greater centralization of switch resources, they have also resulted in
increased  distances  between  the  central office  and  the  subscribers. Rapid
deployment of  DLCs was  necessary to  effectively transmit  signals over  these
greater  distances. However, the copper infrastructures supported by traditional
DLCs lacked the bandwidth for additional lines and the transmission quality  for
high  speed telecommunications. In response to  these limitations as well as the
deterioration of the existing  copper infrastructure, telephone companies  began
installing  fiber  in  high  density  urban  markets  in  the  late  1980s. Next
generation DLCs (``NGDLCs") were  designed and introduced to  the market in  the
early  1990s to support telecommunications  services over fiber-only networks in
densely populated urban markets with 600  to 2,000 lines within the  serviceable
area  of the NGDLC  (``large line-size markets"). NGDLCs  address certain of the
limitations inherent in DLCs. However,  NGDLCs have high installation costs  and
complex,  support-intensive  characteristics  and are  optimized  for fiber-only
networks and large line-size markets.
 
                                       25
<PAGE>
    Although urban  markets have  experienced the  greatest initial  demand  for
additional   lines  and  high-speed  telecommunications  services,  the  Company
believes that demand  for these  services is  increasing in  rural and  suburban
markets  as well.  The Company  also believes,  however, that telecommunications
service providers  in suburban  and  rural markets  generally  do not  have  the
resources  to  completely replace  existing copper  networks and  therefore must
upgrade to fiber in incremental steps. These incremental infrastructure upgrades
result in hybrid networks containing  both copper and fiber transmission  lines.
In  addition, worldwide  demand for  POTS and,  to a  lesser extent,  high speed
telecommunications services, is creating the need for significant infrastructure
investments to  increase  the effective  capacity  of existing  copper,  replace
deteriorating  copper and provide  services in new  areas. As telecommunications
service providers upgrade to fiber technology, deploy new networks and plan  for
future  subscriber  services,  they must  determine  how to  ensure  a seamless,
cost-effective connection between copper and fiber within the local loop.
 
THE AFC SOLUTION
 
    The  Company  has  developed  the  UMC  system  to  provide  cost-effective,
multi-feature local loop systems for the small line-size market, incorporating a
modular architecture that supports copper, fiber and coax and the evolution from
one  transmission media to another. The Company  believes that the UMC system is
the only digital loop carrier that can operate simultaneously over a variety  of
transmission  media. The  UMC system  is easily scalable  from six  to 672 lines
through the addition of  plug-in components. Utilizing a  single platform and  a
variety of line cards supporting specific services, the UMC system is capable of
providing a range of voice and data services. In addition, the UMC system can be
installed  in  a  variety  of  network  configurations  to  support  the varying
geographic distribution of subscriber  bases. The Company  has designed the  UMC
system  to  require  a  minimum  number  of  common  control  units  to  support
transmission over a variety of media and the delivery of more advanced  services
and   features  by   telephone  companies.  Thus,   the  UMC   system  offers  a
cost-effective solution for the  small line-size market with  a wide variety  of
features and advanced services.
 
AFC'S STRATEGY
 
    AFC's   objective  is  to   be  the  leading   provider  of  cost-effective,
multi-feature local loop systems for small line-size markets worldwide. The  key
elements of its strategy to achieve this objective include:
 
    TARGET  DOMESTIC SMALL LINE-SIZE MARKETS.   The Company sells the UMC system
principally through  its  direct  sales  force  into  domestic  small  line-size
markets. These markets, which are generally located in rural and suburban areas,
are  served by  independent telephone  companies and  by the  RBOCs. The Company
intends to expand its direct sales force and augment its marketing and  customer
support  efforts  to  further  penetrate  its  existing  customer  base  of  350
independent telephone companies and penetrate  the balance of the  approximately
1,300 independent telephone companies. In addition, with the recent satisfactory
completion of a Bellcore technical audit, the Company intends to expand into the
RBOC  market by  offering the UMC  system as  a solution to  the small line-size
system requirements of the RBOCs.
 
    PENETRATE INTERNATIONAL  MARKETS.    The  Company  markets  the  UMC  system
internationally   through  local  distributors  and  agents,  through  strategic
relationships, and directly to local  service providers. The Company intends  to
enhance  its existing international operations  with greater sales and marketing
resources to  pursue  market  opportunities in  countries  currently  undergoing
initial   infrastructure  deployment  or  upgrades  which  demand  flexible  and
cost-effective systems.
 
    PROVIDE COST-EFFECTIVE SOLUTIONS.  The UMC system enhances the  transmission
quality and capacity of existing copper facilities, enabling telephone companies
to  maximize  the  performance  of  the  existing  copper  infrastructure  while
permitting  a  cost-effective  and  easily  configurable  upgrade  solution   as
infrastructure is modernized or demands for more advanced communication services
increase. The Company believes that
 
                                       26
<PAGE>
the UMC system is the only digital loop carrier that can operate seamlessly over
hybrid  networks including  copper, fiber and  analog radio. The  UMC system can
also serve as a  platform for providing high  speed data transmission and  other
advanced  digital  services  such  as video  teleconferencing.  The  Company has
designed the UMC system to require a  minimum number of common control units  to
support  transmission over a variety of media  and the delivery of more advanced
services and  features by  telephone companies.  The Company's  engineering  and
manufacturing  efforts are  directed toward  preserving and  enhancing the cost-
effectiveness of the UMC system as new features and designs are released.
 
    EXTEND TECHNOLOGY  LEADERSHIP.    The  UMC  system  contains  a  proprietary
software  and backplane design and  modular architecture, which enable telephone
companies  to  more  easily  support  the  varying  geographic  distribution  of
subscriber  bases by employing multiple  configurations which may be distributed
over any combination of  transmission media (including  copper, fiber, coax  and
analog  radio). The proprietary backplane design currently supports a variety of
voice and data services, and the  Company is developing improvements to  support
higher  bandwidth applications. The  Company is engaged  in ongoing research and
development to leverage its technical expertise  and to adapt its technology  to
new markets and applications.
 
    DEVELOP  STRATEGIC  RELATIONSHIPS.   The  Company has  entered  into certain
strategic relationships in order to  broaden the manufacturing and  distribution
of  the  UMC system  into developing  international markets,  such as  China and
India, and  to leverage  the  UMC technology  for  applications in  markets  not
directly  targeted by the  Company, such as the  provision of telephone services
over existing  cable TV  systems.  The Company  intends  to invest  in  existing
strategic   relationships  and   to  seek   additional  relationships   to  gain
manufacturing and distribution leverage, to access advanced technologies and  to
broaden the acceptance of the UMC system.
 
TECHNOLOGY AND PRODUCT ARCHITECTURE
 
    The  UMC architecture is based upon  a modular software and hardware product
platform that can be  configured and adapted to  the particular requirements  of
the  customer.  Each line  card, transceiver  and  common control  unit contains
proprietary application specific integrated circuits ("ASICs") that  incorporate
the  digital cross-connect function, eliminating the need for a separate digital
cross-connect within the assembly. This design improves efficiency, allowing the
Company to deliver the common control required by telephone companies with fewer
assemblies than most NGDLCs.
 
    A basic UMC system consists of two terminals. Each terminal contains a power
supply, a  central  processing unit  ("CPU"),  a  transceiver and  a  line  card
providing  subscriber service, such as analog  voice service. The Local Exchange
Terminal (``LET"), located  next to  the local  exchange switch  in the  central
office,  contains  a  central processing  unit  and transmits  and  receives the
telephone signal from the Remote Service Terminal (``RST") mounted close to  the
subscriber group in a weatherproof housing. The RST receives analog signals from
the  telephone  instruments  of  subscribers,  transforms  them  into  digitally
encoded, time divisioned  multiplexed bit  streams, and  transports them  across
either copper, fiber or radio transmission media to a central office. There, the
LET  either decodes the  signal and converts  it back into  an analog signal for
connection into the telephone network,  or connects the digital signal  directly
into the network.
 
    The  base UMC system permits telephone companies to offer basic analog voice
service to six subscribers and is priced at approximately $4,000, excluding  the
cabinet.  The  base  UMC  system  can  be  expanded  to  accommodate  additional
subscribers, to  provide advanced  services  and to  operate over  different  or
multiple  transmission media. The UMC system can be configured to accommodate up
to 120 subscribers through the addition of line cards and up to 672  subscribers
through  the addition of  channel bank assemblies. During  the second quarter of
1996, UMC systems with capacities of 120 and 240 lines of POTS sold for  average
prices,   including  the   cabinet,  of   approximately  $25,000   and  $44,000,
respectively.
 
                                       27
<PAGE>
    In addition, the UMC architecture enables telephone companies to more easily
support the varying  geographic distribution  of subscriber  bases by  employing
multiple configurations which may be distributed over any combination of various
transmission  media, including copper, fiber and  coax. A sample installation is
depicted below:
 
                  [Diagram of sample UMC system installation.]
 
        The UMC  system consists  of  the following  modules, which  may  be
    configured according to the needs of the Company's customers:
 
        CHANNEL  BANK ASSEMBLY.   The channel bank assembly  is used at both
    the remote and central office location, employing a 98 megabit backplane
    and a flexible slot architecture which supports system expansion (via  a
    fiber connection between channel bank assemblies) to 672 subscribers, as
    well as a variety of configurations to match the geographic distribution
    of the subscribers served.
 
        COMMON  CONTROL  UNITS.   Common control  units include  the central
    processing unit, power supplies  at both the  central office and  remote
    location,  connection  units  for  expansion  of  the  system  from  120
    subscriber lines to 672  subscriber lines and a  metallic test unit  for
    network testing from the central switching office.
 
        TRANSCEIVERS.   Transceivers used for providing the transport of the
    signal  between  the  subscriber  and  the  central  office  switch  are
    available in fiber, E1, T1 and analog radio versions.
 
        LINE  CARDS.   Line  cards are  designed to  provide voice  and data
    transmissions in either  analog or  digital form for  both domestic  and
    international requirements.
 
        SOFTWARE.   The UMC proprietary system  software is menu driven with
    self-configurable plug and play  orientation, providing detailed  system
    monitoring, alarm information, card inventory and security.
 
        CABINET.   The UMC cabinet is available in configurations supporting
    subscriber levels  of 48,  120, 240  or 672.  The cabinet  is a  weather
    resistant,  field installable unit and  includes power supplies, battery
    backup, lightning protection and cross-connect capabilities.
 
                                       28
<PAGE>
MARKETS AND CUSTOMERS
 
    To date, the UMC system  has been deployed primarily  in the U.S. rural  and
suburban  markets served by  independent telephone companies.  While the Company
believes this market has substantial  revenue potential and intends to  continue
to  pursue customers in  the U.S. small  line-size market, the  Company has also
begun to pursue other potential markets  and customers for the UMC system,  such
as the RBOCs, international telecommunications service providers and competitive
access providers.
 
    DOMESTIC SMALL LINE-SIZE MARKET
 
    The  domestic small  line-size markets  for telecommunications  services are
generally located in rural  and suburban areas and  are served by  approximately
1,300  independent  telephone companies  and  the seven  RBOCs.  The independent
telephone companies range from rural companies with as few as 125 subscribers to
GTE, with approximately  17 million  subscribers. The  independent companies  in
general  do  not  require  telephone  equipment  suppliers  to  satisfy Bellcore
testing, and typically do not require specific design changes in the product  in
order  for the equipment  to be deployed. As  a result, the  Company was able to
deploy the UMC system  rapidly to independent telephone  companies and to  build
customer  acceptance  of  the  UMC  system  quickly.  In  addition,  independent
telephone companies typically have smaller budgets for telephone equipment  than
the  RBOCs and demand easily scalable and configurable cost-effective solutions.
The UMC  system's  ability  to  improve analog  transmission  and  increase  the
capacity   of  existing   networks,  together   with  its   ability  to  operate
simultaneously over a variety of transmission media, enables telephone companies
to maximize the performance of existing copper infrastructure while permitting a
cost-effective and  easily configurable  upgrade solution  as infrastructure  is
modernized  or demands for more  advanced communication services increase. Thus,
the Company believes that the UMC system provides an attractive solution for the
independent telephone companies in small line-size markets. Moreover, since  the
UMC  system  has  recently completed  a  Bellcore technical  audit,  the Company
intends to expand into the RBOC market by offering the UMC system as a  solution
for the small line-size system requirements of the RBOCs.
 
    The  Company has segmented and prioritized the independent telephone company
market  into  the  following:  (i)   small  independents  that  use   consulting
engineering   firms  to  provide  network   design  for  service  expansion  and
modernization; (ii)  medium-size independents  that perform  the network  design
internally;  and (iii)  large independents, such  as GTE,  that have engineering
committees that approve  equipment for standardization  and may require  testing
and  equipment modifications  to meet  their specific  network requirements. The
Company has targeted each  of these segments as  sources of potential  customers
and to date over 350 independents have purchased the Company's products.
 
                                       29
<PAGE>
    The  following  table lists  the independent  telephone companies  that have
purchased at least $200,000 of equipment from the Company since July 1995:
 
3 Rivers Telephone Co-Op
Ace Telephone Association
ALLTEL
Arvig Telephone
Benton Cooperative Telephone Company
Big Bend Telephone
Blackfoot Telephone Co-Op
Blue Earth Valley Telephone Company
Bridgewater Telephone
Central Texas Telephone Co-Op
Central Utah Telephone
Century Telephone
Champlain Valley Telecommunications Co-Op
Chequamegon Telephone Co-Op
Cimarron Telephone
Citizens Telephone
Classic Telephone
Clay County Rural Telephone
Cross Telephone
Crosslake Telephone & Cable
Custer Telephone Co-Op
Dickey Rural Telephone
Ellensburg Telephone
Farmers Telephone Co-Op
Franklin Telephone
Frontier Communications
Geneseo Telephone
Golden West Telecommunications
Granite State Telephone
GTE
Guadalupe Valley Telephone Co-Op
Hancock Rural Telephone
Hill Country Telephone Co-Op
Illinois Consolidated Telephone Company
JBN Telephone
Lakedale Telephone
Lincoln Telephone & Telegraph
Lincolnville Telephone
Mankato Citizens Telephone
Midplains Telephone
Nemont Telephone Co-Op
North Pittsburg Telephone
Northland Telephone
Pioneer Telephone Association
Pioneer Telephone Co-Op
Planters Telephone Co-Op
Pond Branch Telephone
Ponderosa Telephone
Prairie Grove Telephone
Project Telephone
PTI Communications
Pulaski-White Telephone
Roanoke & Botetourt Telephone
Roanoke Telephone
RT Communications
Rural Telephone Service
S&A Telephone
St. Joseph Telecommunications
Sioux Valley Telephone
Skyline Telephone
South Central Rural Telephone
Spring Valley Telephone
TDS Telcom
Twin Valley-Ulen Telephone
Valley Telephone Co-Op
West Carolina Rural Telephone Co-Op
West River Telecommunications
 
    INTERNATIONAL MARKETS
 
    The international telephone  market is segmented  into developing  countries
requiring  basic telecommunication  services, or  POTS, and  developed countries
which,  in   addition   to   POTS,   have   requirements   for   more   advanced
telecommunication  services  and which  have barriers  to entry  in the  form of
standards  or  unique  domestic  network   specifications.  In  most  of   these
international  markets, a  single telephone  company, which  is typically highly
regulated  and  government-owned,  provides  service  throughout  the   country.
Typically,  these companies are  striving to install  technology that offers the
opportunity in the future for advanced  services, with ease of installation  and
servicing  at an  attractive price. In  addition, they are  striving to optimize
existing facilities, which typically consist of copper, for a growing subscriber
base. The Company is  pursuing selected opportunities  to develop these  markets
primarily  through  direct  contacts  with local  distributors  and  through its
strategic relationships, where the market  also requires local manufacturing  to
address  high import tariffs and where the Company benefits from a local partner
that can assist customer relationships.
 
    As part of its international strategy,  the Company is primarily focused  on
the  substantial  market  opportunity  which  the  Company  believes  exists  in
developing countries currently undergoing infrastructure
 
                                       30
<PAGE>
deployment. Telecommunications companies  in these markets  demand flexible  and
cost-effective  systems. The Company has sold UMC systems to telephone companies
in China, Mexico, the Netherlands Antilles and the Dominican Republic. In China,
the UMC system has  been installed in several  customer sites and the  Company's
joint  venture has begun pilot  production of the UMC  system in Hangzhou, China
for the China market. In Mexico, the Company was selected as one of two  vendors
for Telefonos de Mexico's rural telephone program. AFC has shipped approximately
$2.7  million of  equipment to  Telefonos de  Mexico through  June 30,  1996 and
anticipates continued shipments through  1997. In South  Africa, the UMC  system
has  completed  field trials  and received  type approval,  and the  Company has
recently received its first order which is scheduled for delivery in the  second
half of 1996.
 
    Telecommunications  companies  in  more  developed  countries  require  that
products  have  modifications   and  design  specifications   that  meet   local
standardization  guidelines.  To date,  the Company  has successfully  met these
standards requirements in, and  is currently shipping  products to, both  France
and  Hong Kong.  The Company was  awarded a  contract with France  Telecom for a
multiplexer subscriber system.  Deliveries under  this contract  began in  April
1996.  The  Company  was  also  awarded  a  three-year  contract  with  Hongkong
Telecommunications Limited to deploy the  UMC system. Although neither of  these
contracts  require the customer to purchase  any specific amount of product from
the Company, the  Company believes  that these customers  present a  significant
opportunity to the Company.
 
    AFC  and Harris Corporation,  a stockholder of the  Company, entered into an
agreement to form a joint venture to manufacture, distribute and support the UMC
system in India. The  joint venture included formation  of a holding company  in
Mauritius,  owned 51% by AFC and 49% by  Harris, which in turn intends to form a
joint venture in India with local  Indian partners following receipt of  certain
government  approvals. To  date, the  parties have  identified and  selected two
Indian companies that  will collectively  own 34% of  the Indian  venture to  be
located  in Delhi. In addition, as a means to protect its licensed technology in
India, AFC formed a  100% foreign-owned subsidiary in  India, AFC India  Private
(Ltd.),  which  holds the  rights to  license  the UMC  technology in  India for
manufacturing in the local  market. To date, the  joint venture activities  have
included  testing  and obtaining  type approval  for the  UMC system.  The joint
venture partners  expect to  receive type  approval in  1996 and  will  actively
pursue sales opportunities for the UMC system.
 
    The  UMC  system  has  received or  is  currently  undergoing  type approval
qualification in  a  number  of countries,  including  Hungary,  Indonesia,  the
Philippines  and Russia.  There can  be no  assurance that  the UMC  system will
receive type  approval in  these or  other  countries or  that receipt  of  type
approval  will lead  to product  sales. In  addition, the  Company currently has
outstanding responses to bid requests from telephone companies in India,  Panama
and  Brazil. The Company's bid responses have been accepted in certain cases and
rejected in others in  the past, and  there can be  no assurance that  currently
outstanding  or future  bid responses  will be  accepted and,  even if accepted,
there can be no assurance that such acceptance will lead to significant sales.
 
    FUTURE MARKET OPPORTUNITIES
 
    REGIONAL BELL OPERATING  COMPANIES (RBOCS).   The  seven RBOCs  make up  the
largest  segment of the U.S. telecommunications  equipment market and serve over
80% of all  U.S. telephone  customers, primarily in  urban areas.  All of  these
companies  have stringent testing  and approval requirements,  known as Bellcore
testing, that must be  met before products can  be installed in their  networks.
Bellcore  testing  requires  significant  investments  in  resources  to achieve
compliance. In addition,  the RBOCs require  that the equipment  undergo one  or
more  field trials  to demonstrate  that the  equipment meets  the standards and
satisfies their  service  and  network requirements.  The  UMC  system  recently
completed  a Bellcore  technical audit,  and the  Company intends  to submit new
features for  Bellcore testing  as they  are released.  Through June  1996,  the
Company  has  delivered $2.3  million of  equipment to  Ameritech pursuant  to a
purchase agreement.  Although  this  agreement does  not  require  Ameritech  to
purchase  any specific amount of product  from the Company, the Company believes
that Ameritech presents a significant  opportunity to the Company. In  addition,
the  UMC system is in laboratory or field trials at the following RBOCs: Pacific
Bell, BellSouth and U.S. West.
 
    COMPETITIVE  ACCESS  PROVIDERS.    Deregulation  has  allowed  non-regulated
telephone companies to provide local telephone services. Through better pricing,
faster installation and better customer service, these
 
                                       31
<PAGE>
companies, known as competitive access providers, hope to attract customers away
from the RBOCs and independent telephone companies. These companies historically
have  focused on  high density  downtown business  customers. As  these carriers
diversify their sales efforts to include smaller businesses and office parks, an
increasing number will  require smaller  systems. The companies  active in  this
market segment are attractive targets for the Company because the UMC system has
the  capability  to  cost-effectively  provide  a  full  range  of communication
services. The  Company intends  to  address this  market primarily  through  its
strategic  relationship with Tellabs. AFC intends to serve this market both over
traditional transmission media as well as over coax media.
 
    CABLE-BASED TELEPHONY.   AFC  and  Tellabs, a  stockholder of  the  Company,
entered  into a general partnership in  1994 to design, develop, manufacture and
distribute a  new product  line derived  from the  UMC system.  This product  is
designed  to  allow telephone  services to  be provided  over existing  cable TV
systems as well  as other  transmission media. AFC  contributed a  non-exclusive
license  to  use  the UMC  technology,  Tellabs  contributed cash  to  the joint
venture,  and  each  received  defined   marketing  rights  for  the   developed
technology. In early 1996, upon review of the development of the market for this
product,  the Company concluded that the  market for transmitting voice and data
over cable systems would develop at  a slower pace than originally  anticipated.
In  the  interest  of  directing its  resources  towards  more  immediate market
opportunities, AFC entered into negotiations  with Tellabs in the first  quarter
of  1996 to  change the relationship  between the parties.  The new relationship
under discussion is intended to provide AFC with royalties and OEM revenues from
Tellabs on its  sales into  its markets  and in return  AFC expects  to work  on
selected   developments  of  the  UMC  technology  for  Tellabs'  markets  on  a
development contract basis.  AFC would retain  all rights in  its technology  as
well  as  the market  rights  previously defined.  The  Company and  Tellabs are
currently continuing discussions.
 
SALES, MARKETING AND CUSTOMER SUPPORT
 
    The Company markets the UMC system worldwide directly to telephone companies
and indirectly  through OEMs,  distributors and  joint ventures  to  accommodate
specific  markets and customer  support requirements. The  Company's sales force
consists of  two  groups,  one  that focuses  on  U.S.  and  Canadian  telephone
companies and one that focuses on international markets.
 
    The Company's North American sales force focuses on developing relationships
with independent telephone companies in the U.S. and Canada and on understanding
their  network deployment strategies and cost requirements. As of June 30, 1996,
the  Company's  domestic  sales   organization  consisted  of  thirteen   direct
salespersons,  a domestic sales vice president, and technical support personnel.
The Company has  sales personnel  located in  Pittsburgh, Minneapolis,  Atlanta,
Denver,  Dallas,  Chicago  and Seattle.  The  Company also  has  sales personnel
dedicated to specific customer accounts, such as GTE and Ameritech. In  addition
to  direct calls  on the telephone  companies, sales to  customers often involve
marketing through consulting  engineers who  are retained  by small  independent
telephone companies for engineering, specification and installation services.
 
    The  Company employs an international direct sales force consisting of three
salespersons and  one vice  president. The  primary tasks  of the  international
sales  force are  to market the  UMC system directly  to international telephone
companies and  to  select,  manage,  and  train  local  distributors.  Sales  to
international   customers   are  primarily   fulfilled  through   the  Company's
distributors and agents. The Company currently has an office in Hong Kong.
 
    The AFC sales  organization receives  support from  the Company's  marketing
department,  which is  responsible, among  other things,  for product marketing,
advertising and marketing communications. The marketing department works closely
with the planning and engineering departments of telephone companies in order to
provide product proposals that are optimal in terms of both performance and cost
for a specific network configuration.
 
    The Company's customer support organization is responsible for servicing the
Company's products and assisting the  Company's sales personnel. In addition  to
its  own  field technical  service  engineers, the  Company  uses Point-to-Point
Communications, Inc.  (``Point-to-Point"), a  third-party support  organization,
which  provides  first-line  support  for  the  Company's  customers  through  a
toll-free number open 24 hours per
 
                                       32
<PAGE>
day, 365 days  per year,  and provides  installation services  on a  subcontract
basis  for the Company. Although to date the Company believes Point-to-Point has
provided satisfactory  customer  assistance,  there can  be  no  assurance  that
Point-to-Point will be able to provide the level of customer support demanded by
existing  or potential customers. The  Company maintains a training organization
which is dedicated  to developing  training curriculums and  materials that  are
made  available to the customer either through a student training or a train the
trainer program. Internationally, the  Company provides customer support  either
directly  or  through authorized  distributors  or joint  venture  partners. The
Company's products generally have a warranty period of 24 months.
 
RESEARCH AND DEVELOPMENT
 
    The  Company's  research  and  development  efforts  have  been  focused  on
developing  local  loop  products  with advanced  features  for  small line-size
markets. The Company has developed a modular software and hardware platform that
can be configured and adapted to particular customer requirements. In  addition,
development  efforts include extensive attention to ease of installation and use
by the customer as evidenced in the menu driven software approach as well as the
compact and efficient hardware design  demonstrated in its PCBAs. The  Company's
research  and  development  personnel  work  closely  with  sales  and marketing
personnel to  ensure development  efforts  are targeted  at customer  needs.  In
addition,  the Company's Advanced Development Team, led by co-founders Jim Hoeck
and John Webley,  focuses on developing  new strategic enhancements  to the  UMC
system, such as a higher bandwidth backplane.
 
    The  current  focus of  the Company's  research  and development  efforts is
directed at new  releases of the  UMC system addressing  market demands for  new
features  and  services.  These  efforts  include  developing  new  transceivers
incorporating HDSL  capabilities, new  customer features  such as  ISDN and  new
interfaces  such as TR303. The Company  is also incorporating MLT remote testing
capabilities into the product in support of the RBOC market. In addition, future
releases  are  expected  to  include   capabilities  to  support  broader   star
configurations,  SONET  OC3 transceivers  and multi-point  support for  the coax
transceiver  version  of  the  product.  Finally,  the  engineering  team   also
concentrates its attention on numerous projects in the areas of cost and quality
improvements in the UMC system.
 
    In  1995 and the six months ended  June 30, 1996, the Company's research and
development expenditures were $5.7 million and $5.9 million, respectively, which
represented 10.6% and 11.0%, respectively, of total revenues in such periods. In
1993 and 1994,  the Company's  research and development  expenditures were  $2.0
million  and $2.9 million, respectively. The  Company considers its research and
development efforts  to be  vital to  its future  success and  anticipates  that
research  and development expenditures  as a percentage  of revenues will remain
significant for  the foreseeable  future. As  of June  30, 1996,  the  Company's
research and development staff consisted of 98 employees.
 
MANUFACTURING
 
    Manufacturing,   system  integration  and  certain  testing  operations  are
performed at the Company's headquarters  in Petaluma, California. The  Company's
manufacturing  operations consist  primarily of  assembling finished  goods from
components and  custom-made  subassemblies (primarily  printed  circuit  boards)
purchased  from third parties. The Company monitors quality at each stage of the
production process, including  the selection of  component suppliers,  warehouse
procedures,  the assembly  of finished  goods and  final testing,  packaging and
shipping. The  Company  also  performs  functional,  environmental  and  systems
testing  and  quality  assurance  procedures  on  the  subassemblies  which  are
incorporated into  the  UMC  system  and with  respect  to  the  final  products
themselves.
 
    The  Company  relies on  a limited  number  of independent  contractors that
manufacture the subassemblies  to the  Company's specifications for  use in  the
Company's  products.  In  particular,  the Company  relies  on:  (i) Flextronics
International Ltd.  and  Tanon Manufacturing,  Inc.  (a division  of  Electronic
Associates, Inc.) to manufacture the Company's printed circuit board assemblies;
(ii)  Paragon, Inc.  to manufacture backplanes  and channel  bank assemblies and
(iii) Sonoma Metal Products, Inc. and Cowden Metal San Jose, Inc. to manufacture
the outside cabinets. The Company believes that it has good relations with  each
of  its suppliers. As the  demand for the UMC  system has increased, the Company
has begun  a program  to identify,  and potentially  qualify at  a future  date,
additional suppliers to manufacture key product subassemblies. While the Company
 
                                       33
<PAGE>
believes  that the subassemblies  manufactured by any of  the suppliers could be
procured  from   alternate  suppliers,   in  the   event  that   the   Company's
subcontractors were to experience financial, operational, production, or quality
assurance difficulties that resulted in a reduction or interruption in supply to
the   Company  or   otherwise  failed   to  meet   the  Company's  manufacturing
requirements,  the  Company's  business,  financial  condition  and  results  of
operations  would be adversely affected until the Company established sufficient
manufacturing supply from alternative  sources. There can  be no assurance  that
the  Company's current  or alternative  manufacturers will  be able  to meet the
Company's future requirements or that such manufacturing services will  continue
to be available to the Company at favorable prices.
 
    Certain  components used in the  Company's products, including the Company's
proprietary ASICs, codecs, certain surface mount technology components and other
components, are  only  available from  a  single  source or  limited  number  of
suppliers.  Some of the Company's sole-source suppliers are companies which from
time to time allocate parts to  telephone equipment manufacturers due to  market
demand  for the telecommunication  equipment. Many of  the Company's competitors
are much larger and may be able to obtain priority allocations from these shared
suppliers, thereby limiting or making unreliable the sources of supply for these
components. The  Company encountered  supply  delays for  codecs in  the  second
quarter of 1994 which resulted in delayed shipments of the UMC system, and there
can  be no assurance that similar shortages will not occur in the future or will
not result in the Company  having to pay a higher  price for components. If  the
Company  is  unable  to  obtain  sufficient quantities  of  these  or  any other
components, delays or  reductions in  manufacturing or  product shipments  could
occur  which would  have a  material adverse  effect on  the Company's business,
financial condition and results of operations.
 
COMPETITION
 
    The market for equipment for local telecommunications networks is  extremely
competitive. The Company's competitors range from small companies, both domestic
and   international,   to  large   multinational  corporations.   The  Company's
competitors include Alcatel Alsthom  Compagnie Generale d'Electricite, DSC,  ECI
Telecom,  Ltd., E/O  Networks, Fujitsu  America, Inc.,  Hitron Technology, Inc.,
Lucent Technologies,  Inc.,  NEC America,  Inc.,  Northern Telecom  Ltd.,  Opnet
Technologies  Co. Ltd.,  RELTEC Corporation, Seiscor  Technologies Inc., Siemens
Corporation, Teledata Communications, Ltd. and Vidar-SMS Co. Ltd. Many of  these
competitors  have more  extensive financial,  marketing and  technical resources
than the Company and enjoy superior name recognition in the market. In addition,
the Company has entered  into agreements with ITRI  to jointly develop  products
based  on the UMC system. ITRI  is a Taiwanese government-sponsored research and
development organization in the telecommunications field. Such agreements  grant
ITRI  and certain of its member companies certain rights to manufacture and sell
the ETSI  version of  the UMC  system outside  of North  America. Such  entities
currently compete with the Company in international markets, primarily in China.
In  addition, upon termination  of the agreements  with ITRI in  2002, ITRI will
have a worldwide,  non-exclusive, royalty-free, irrevocable  license to use  the
ETSI version of the UMC technology and, consequently, such member companies will
be  able to compete with the Company worldwide at such time. There is an ongoing
dispute subject  to litigation  between the  Company and  ITRI and  such  member
companies  as to whether, among other things,  ITRI possesses the right to grant
such rights to manufacture and  sell the ETSI version of  the UMC system to  new
member companies. Depending on the outcome of this dispute, the Company may face
competition  from new member companies  for the ETSI version  of the UMC system.
Such companies  may  possess  substantially  greater  financial,  marketing  and
technical resources than the Company. The Company may also face competition from
new  market entrants.  The principal competitive  factors in the  segment of the
telecommunications equipment industry  in which the  Company operates are  total
cost  of solution, product quality  and performance, scalability, flexibility of
configuration and range of system  capabilities available. The Company  believes
that  it competes favorably with respect to  these factors, and that the ability
of the UMC  system to  offer voice  and data  communications over  a variety  of
transmission  media in a cost-effective package provides a competitive advantage
in the small line-size market. There can  be no assurance that the Company  will
be able to compete successfully in the future.
 
                                       34
<PAGE>
COMPLIANCE WITH REGULATORY AND INDUSTRY STANDARDS
 
   
    The  UMC system is required to comply with  a large number of voice and data
regulations and standards,  which vary domestically  versus internationally  and
may  vary by the  specific international market  to which the  Company sells its
products. The  standards in  the United  States are  determined by  the FCC,  by
Underwriters  Laboratories, by independent telephone  companies and by Bellcore.
The UMC technology is certified  by Underwriters Laboratories. In  international
markets,  the  Company's  products  must  comply  with  recommendations  by  the
Consultative  Committee  on  International  Telegraph  and  Telephony  and  with
requirements  established by the individual  regional carriers which specify how
equipment that is connected to their  local networks must operate. In  addition,
the  Company's  products  must  comply with  standards  issued  by  the European
Telecommunications Standards  Institute.  These standards  are  implemented  and
enforced by the Telecommunications Regulatory Authority of each European nation.
Standards  for new services continue to evolve, and the Company will be required
to modify its products or  develop and support new  versions of its products  to
meet these standards. The failure of the Company's products to comply, or delays
in  meeting compliance,  with the  evolving standards  both in  its domestic and
international markets  could have  a material  adverse affect  on the  Company's
business, financial condition and results of operations.
    
 
   
    In  addition, the Company will  need to ensure that  its products are easily
integrated with  the  carriers' network  management  systems. The  RBOCs,  which
represent  a large segment of the  U.S. telecommunications market, in many cases
require that equipment  integrated into  their networks be  tested by  Bellcore,
indicating   that   the  products   are   interoperable  with   the  operations,
administration, maintenance and provisioning systems used by the RBOCs to manage
their networks. Bellcore testing  requires significant investments in  resources
to  achieve compliance. The  UMC system recently  completed a Bellcore technical
audit and was  found to meet  applicable requirements. The  failure to  maintain
such compliance and/or to obtain it on new features released in the future could
have  a material adverse affect on the  Company's ability to sell the UMC system
to the RBOCs, which represent a large segment of the telecommunications market.
    
 
    The Company has not received ISO certification, which certifies that  design
and  manufacturing  processes  adhere  to  certain  established  standards. Many
telecommunications service providers particularly in international markets, will
not purchase products from suppliers  that have not received ISO  certification.
Accordingly,  until it is able  to obtain ISO certification,  the Company may be
precluded from selling its products to  these service providers and its  ability
to  compete with  other suppliers of  communications equipment  may be adversely
affected. The Company  intends to initiate  the formal process  of applying  for
ISO-9001  certification  during the  first quarter  of 1997.  ISO-9001 addresses
quality assurance in design, development, production, installation and  service.
There  can  be no  assurance as  to when  or  if the  Company will  receive such
certification. The failure to obtain such certification may preclude the Company
from selling the UMC system in certain markets.
 
    The  U.S.   Congress   recently   passed   new   regulations   that   affect
telecommunications services, including changes to pricing, access by competitive
suppliers  and  many  other broad  changes  to the  data  and telecommunications
networks and services. These changes will have a major impact on the pricing  of
existing  services,  and may  affect the  deployment  of future  services. These
changes could cause  greater consolidation in  the telecommunications  industry,
which  in turn could disrupt existing customer relationships and have a material
adverse effect on  the Company's  business, financial condition  and results  of
operations.  There can be no assurance that any regulatory changes will not have
a material  adverse  effect  on  the demand  for  the  UMC  system.  Uncertainty
regarding future policies combined with emerging new competition may also affect
the demand for telecommunications products such as the UMC system.
 
PROPRIETARY RIGHTS AND LICENSES
 
    The  Company attempts  to protect  its technology  through a  combination of
copyrights, trade secret laws and contractual obligations. The Company does  not
presently  hold  any  patents  for  its  existing  products  and  has  no patent
applications pending. There can be no assurance that the Company's  intellectual
property  protection measures will be  sufficient to prevent misappropriation of
the  Company's  technology   or  that   the  Company's   competitors  will   not
independently   develop  technologies  that   are  substantially  equivalent  or
 
                                       35
<PAGE>
superior to the  Company's technology.  In addition,  the laws  of many  foreign
countries  do not protect the Company's intellectual property rights to the same
extent as the laws of the United  States. The failure of the Company to  protect
its  proprietary  information  could  have  a  material  adverse  effect  on the
Company's business, financial condition and results of operations.
 
    The increasing dependence of the telecommunications industry on  proprietary
technology  has  resulted in  frequent litigation  based  on allegations  of the
infringement of patents  and other intellectual  property. The Company  recently
settled  litigation with DSC  under which DSC had  claimed proprietary rights in
the UMC technology. See ``-- Legal  Proceedings." In the future the Company  may
be  subject to additional litigation to  defend against claimed infringements of
the rights of others or to determine  the scope and validity of the  proprietary
rights of others. Future litigation also may be necessary to enforce and protect
trade  secrets and other intellectual property  rights owned by the Company. Any
such litigation could be  costly and cause  diversion of management's  attention
either  of which could have a material adverse effect on the Company's business,
financial condition and  results of  operations. Adverse  determination in  such
litigation could result in the loss of the Company's proprietary rights, subject
the  Company to  significant liabilities, require  the Company  to seek licenses
from third parties,  or prevent the  Company from manufacturing  or selling  its
products, any one of which could have a material adverse effect on the Company's
business,  financial condition and results of operations. Furthermore, there can
be no assurance  that any  necessary licenses  will be  available on  reasonable
terms.
 
    In  September 1992, AFC entered into agreements (the "ITRI Agreements") with
the  Industrial  Technology  Research  Institute  ("ITRI")  to  jointly  develop
products  based  on the  ETSI version  of the  UMC system.  ITRI is  a Taiwanese
government-sponsored   research    and   development    organization   in    the
telecommunications  field.  Under the  ITRI Agreements,  ITRI has  the exclusive
right in Taiwan to use and develop  the ETSI version of the UMC technology,  and
to  manufacture such version of the UMC system through the member companies, but
does not have the right to manufacture and sell the Company's proprietary  ASICs
except  in circumstances where AFC has failed  to provide the ASICs as required.
The ASIC designs were placed in escrow in order to be available to ITRI and  the
member  companies should the  right to manufacture  ASICs become effective. ITRI
and the member companies also  have a non-exclusive right  to sell or lease  the
ETSI  version of the UMC  system in all countries  outside of North America. The
ITRI Agreements require ITRI to pay the Company a royalty on sales or leases  of
the  UMC system made through  September 2002, at which  time the license becomes
fully-paid, and  ITRI  will  have  a  worldwide,  non-exclusive,  royalty  free,
irrevocable license to use the ETSI version of the UMC technology. ITRI's member
companies currently compete with the Company in international markets, primarily
in  China. The Company is currently involved in litigation with ITRI and certain
of its  member companies  arising  out of  disputes  over, among  other  things,
payment  of royalties  and the  supply of ASICs.  See ``--  Competition" and "--
Legal Proceedings -- ITRI."
 
LEGAL PROCEEDINGS
 
    ITRI
 
   
    In 1995,  a dispute  arose among  the Company,  ITRI and  certain of  ITRI's
member companies (the "Member Companies") in which the Company claimed that ITRI
and the Member Companies were, among other things, failing to pay royalties when
due.  In reliance upon certain provisions of the ITRI Agreements, in April 1996,
the Company ceased delivering to the Member Companies certain proprietary  ASICs
used  in the  manufacture of  the UMC system.  Pursuant to  agreements with ITRI
reached in  1994, design  documentation for  these  ASICs are  held in  a  trust
account,  with directions that the designs can  be made available to ITRI on the
occurrence of specified conditions.  On July 9,  1996, the trustee-custodian  of
the  ASIC designs filed suit  against the Company in  the United States District
Court, Eastern District of  New York, alleging that  the Company had  wrongfully
discontinued  the sale of the ASICs to the Member Companies. Among other things,
the complaint  seeks  unspecified  damages  on behalf  of  the  trustee,  and  a
determination that the trustee can release the ASIC designs to ITRI. On July 31,
1996, the Company filed a counterclaim against the trustee claiming, among other
things,  that the trustee improperly disclosed the design documentation to third
parties.
    
 
                                       36
<PAGE>
   
    On July 30,  1996, the Company  filed suit  against ITRI and  others in  the
United States District Court, Northern District of California, for breach of the
ITRI   Agreements,   breach   of   covenants  of   good   faith,   trade  secret
misappropriation, tortious  interference,  and  related  claims.  The  complaint
alleges  that ITRI breached the ITRI  Agreements, among other things, by failing
to collect royalties owed to the  Company, by developing UMC-based products  not
shared  with  the Company,  by transferring  UMC  technology to  an unauthorized
company, and by misappropriating the Company's  trade secrets and that the  ITRI
Agreements  have been terminated.  The Company seeks  damages, punitive damages,
and declaratory  and injunctive  relief. On  September 13,  1996, ITRI  filed  a
demand  for arbitration of the dispute and claimed, among other things, that the
Company has breached the ITRI Agreements and is liable for unspecified royalties
and punitive damages, and claiming proprietary rights in certain UMC technology.
On September 30,  1996, the Company  amended the complaint  in its suit  against
ITRI to add the Member Companies and another company as parties to the suit.
    
 
   
    On  August 27, 1996, the Member Companies  filed suit against the Company in
United States District Court, Northern  District of California, alleging  breach
of  contract and  unfair competition based  on the  Company's discontinuation of
ASIC sales to the Member Companies. The complaint filed by the Member  Companies
alleges  that the Company lacked justification  to discontinue the sale of ASICs
and that its failure  to sell ASICs to  the Member Companies constituted  unfair
competition. The complaint seeks court-ordered arbitration, unspecified damages,
punitive  damages and an injunction requiring further  sales of the ASICs to the
Member  Companies.  On  September  6,  1996,  the  court  granted  a   temporary
restraining  order pursuant to which the Company  will be required to supply the
Member Companies with a specified number  of ASICs during the ensuing two  month
period on the terms and conditions set forth in the ITRI Agreements. The court's
order  was granted  as an  interim measure  to preserve  the status  quo pending
adjudication on  the  merits. The  Company  believes that  compliance  with  the
court's order will not have a material adverse effect on the Company's business,
financial  condition  and  results of  operations.  On September  16,  1996, the
Company filed  counterclaims  seeking  declaratory  and  injunctive  relief  and
damages  against Member Companies  for, among other  things, breach of contract,
fraud and misappropriation of trade secrets.  On September 23, 1996, the  Member
Companies filed a demand for arbitration of the dispute and claimed, among other
things,  actual damages in  excess of $60  million, legal fees  and expenses and
punitive damages.
    
 
   
    The Company believes that it has meritorious defenses to the claims asserted
by ITRI  and  the Member  Companies  and it  intends  to defend  the  litigation
vigorously.  Moreover, the Company  believes that the  Member Companies' damages
claim is without  merit. The Company  further believes that  its claims  against
ITRI  and  the  Member Companies  are  meritorious  and the  Company  intends to
vigorously pursue such  claims. However,  due to the  nature of  the claims  and
because the proceedings are in the discovery stage, the Company cannot determine
the  total expense  or possible  loss, if any,  that may  ultimately be incurred
either in the context  of a trial,  arbitration or as a  result of a  negotiated
settlement.  Regardless of  the ultimate  outcome of  the proceedings,  it could
result in  significant diversion  of  time by  the Company's  management.  After
consideration  of  the  nature of  the  claims  and the  facts  relating  to the
proceedings, the Company believes  that the resolution of  this matter will  not
have  a material adverse  effect on the  Company's business, financial condition
and results of operations; however, the results of these proceedings,  including
any  potential settlement, are uncertain  and there can be  no assurance to that
effect. See "Risk Factors -- Competition" and "-- Risks Associated with  Pending
Litigation."
    
 
    DSC
 
   
    From  July 1993 until June 1996 the  Company was involved in litigation with
DSC. DSC had alleged, among other  things, that the UMC technology contained  or
was  derived from  trade secrets  and other  proprietary technology  of DSC. The
parties entered into a Settlement Agreement and Mutual Releases dated as of June
24, 1996 (the  ``Settlement Agreement"),  pursuant to which  the litigation  was
terminated.  Under the terms  of the Settlement Agreement,  the Company paid DSC
$3.0 million in June 1996,  agreed to pay DSC up  to an additional $8.5  million
(subject  to reduction to present value in the event of prepayment) through 2001
and agreed  to issue  certain  shares of  Common Stock  to  DSC. Of  the  shares
issuable  under the  Settlement Agreement,  719,424 shares  were issued  in June
1996, subject  to certain  adjustments.  In addition,  under  the terms  of  the
Settlement  Agreement, AFC maintains  all rights to the  UMC technology free and
    
 
                                       37
<PAGE>
clear of any claim by DSC. In July 1996, the Company borrowed approximately $7.1
million (representing the present value of the $8.5 million obligation) under  a
six-month  term loan and  repaid its remaining  obligations under the Settlement
Agreement. See "Selected Consolidated Financial Data," ``Management's Discussion
and Analysis of Financial Condition and Results of Operations" and Notes 7 and 9
of  Notes   to  Consolidated   Financial   Statements.  The   Company   provided
indemnification to certain stockholders in connection with the settlement of the
DSC litigation. See "Certain Transactions."
 
    OTHER
 
    On  June  20,  1995,  two  investment  limited  partnerships,  Equity-Linked
Investors, L.P. and Equity-Linked Investors, L.P. II (the ``Plaintiffs"),  filed
a  complaint against  the Company  in the United  States District  Court for the
Southern District of  New York.  The Plaintiffs' complaint  contains claims  for
breach  of contract, promissory estoppel, and specific performance related to an
alleged subordinated  debt financing  agreement. The  Plaintiffs are  affiliated
with  Desai Capital Management Incorporated (``Desai"). From March to June 1995,
the Company  was  involved  in  negotiations with  Desai  regarding  a  proposed
subordinated  debt financing  of the  Company. On  June 13,  1995, the Company's
Board of  Directors  disapproved  the proposed  transaction.  According  to  the
Plaintiff's  complaint, the Company had a binding commitment to proceed with the
proposed financing. The complaint alleges that the Company committed to accept a
$10 million to  $15 million loan  from the Plaintiffs  in exchange for  interest
payments  and  warrants to  purchase 350,000  shares of  the Company's  Series E
Preferred Stock at $12.50 per share (not taking into account a two-for-one stock
split in September 1995 and the  further two-for-one stock split to be  effected
in  August 1996).  The complaint  alleges damages  of ``at  least the difference
between their exercisable $12.50 per share  price on 350,000 shares and the  per
share price of stock sold in any initial public offering."
 
    On  July  12, 1995,  and September  8,  1995, the  Company filed  motions to
dismiss the case for lack of federal jurisdiction and failure to state a  claim.
The  Company's motions to  dismiss the case remain  pending and undecided. There
has been no discovery in the case, and no trial date is set.
 
    The  Company   denies  the   allegations  of   the  Plaintiffs'   complaint,
specifically  denies that  there was  any contract,  and intends  to contest the
claims vigorously.
 
EMPLOYEES
 
    As of  June 30,  1996, AFC  had  315 full-time  employees, including  53  in
marketing,  sales and support  services, 98 in research  and development, 121 in
operations and  43 in  general administrative  positions. Substantially  all  of
AFC's employees are based at the Company's headquarters in Petaluma, California.
None  of the Company's employees  are represented by a  labor union. The Company
believes its relationships with its employees are good and has never experienced
a strike or work stoppage.
 
PROPERTIES
 
    The Company's administrative, sales  and marketing, and product  development
headquarters  are  located in  Petaluma,  California, where  the  Company leases
approximately 75,000 square feet under leases expiring beginning in March  2005.
The  Company  recently  completed lease  negotiations  for  approximately 90,000
square feet  of  additional space  in  two  buildings, which  is  scheduled  for
occupancy  in the latter half  of 1996 and early  1997. The Company believes its
facilities are  adequate  for  its  current  needs and  for  its  needs  in  the
foreseeable future.
 
                                       38
<PAGE>
                                   MANAGEMENT
 
EXECUTIVE OFFICERS, KEY EMPLOYEES AND DIRECTORS
 
    The  executive officers,  key employees  and directors  of the  Company, and
their respective ages as of June 30, 1996, are as follows:
 
<TABLE>
<CAPTION>
NAME                                                  AGE      POSITION
- ------------------------------------------------      ---      ------------------------------------------------
<S>                                               <C>          <C>
EXECUTIVE OFFICERS
Donald Green....................................          65   Chairman of the Board and Chief Executive
                                                               Officer
Carl J. Grivner.................................          42   President and Chief Operating Officer and
                                                               Director
Karen Godfrey...................................          42   Corporate Controller and Assistant Secretary
Glenn Lillich...................................          49   Vice President, Domestic Sales and Marketing
Dan E. Steimle..................................          48   Vice President, Chief Financial Officer,
                                                               Treasurer and Secretary
KEY EMPLOYEES
James Hoeck.....................................          35   Vice President, Advanced Development
John Webley.....................................          38   Vice President, Advanced Development
David Arnold....................................          46   Vice President, Engineering Development
Michael Hatfield................................          33   Vice President, International and Product
                                                               Management
Peter Kilkus....................................          51   Vice President, Quality
Greg Steele.....................................          35   Vice President, Operations
OUTSIDE DIRECTORS
B.J. Cassin (1).................................          62   Director
Clifford H. Higgerson (1) (2)...................          56   Director
Brian Jackman (2)...............................          55   Director
Dan Rasdal (1)..................................          62   Director
</TABLE>
 
- ---------
(1) Member of the Audit Committee.
 
(2) Member of the Compensation Committee.
 
   
    DONALD GREEN was  a co-founder  of the Company  and has  been the  Company's
Chairman  of the Board  and Chief Executive  Officer since May  1992. He founded
Optilink Corporation ("Optilink") in 1987 to develop a fiber NGDLC system called
the Litespan 2000. Mr.  Green was the President  and Chief Executive Officer  of
Optilink  from 1987 until  its acquisition by  DSC in 1990.  From 1990 until the
founding of the Company, Mr. Green was Vice President and General Manager of the
Access Products division of  DSC. Prior to founding  Optilink, Mr. Green  served
for  17 years as Chief Executive Officer of Digital Telephone Systems, a company
he founded in  1969 to  develop, manufacture and  market the  D960 Digital  Loop
Carrier system. Prior to founding Digital Telephone Systems, Mr. Green served as
Project  Engineer  and, subsequently,  Vice President  of Engineering  for Lynch
Communication Inc., a  telecommunications company ("Lynch"),  as well as  Design
Engineer  for RCA Standard Telephone  Cables (UK), a telecommunications company.
Mr. Green began his career  with British Telecom, a telecommunications  company,
and is a graduate of the British Institute of Electrical Engineers.
    
 
    CARL J. GRIVNER has been the Company's President and Chief Operating Officer
since  December 1995 and a  Director since May 1996.  From July 1995 to December
1995 he was the Company's Chief  Operating Officer. From September 1994 to  July
1995, he was President of Enhanced Business Services of Ameritech, an RBOC. From
1986 to September 1994, Mr. Grivner held various general management positions at
Ameritech,  including  President  of  Ameritech's  Advertising  Services (Yellow
Pages) Unit. From 1977 to 1986,
 
                                       39
<PAGE>
he held a variety of technical and marketing positions at International Business
Machines, Inc.  Mr. Grivner  holds a  Bachelor of  Arts degree  in Biology  from
Lycoming  College and  an advanced degree  from the  University of Pennsylvania,
Wharton School of Business.
 
    KAREN GODFREY has been the Company's Corporate Controller since May 1994 and
its Assistant Secretary since  February 1995. From September  1992 to May  1994,
Ms.  Godfrey was self-employed as a financial management consultant. Ms. Godfrey
was the Chief Financial Officer of  Fortune's Almanac, Inc., a catalog  company,
from  September 1991 to September 1992 and  the Chief Financial Officer and Vice
President of Operations  of Paracomp,  Inc., a  software company,  from 1989  to
September  1991. Ms.  Godfrey held  various financial  management positions with
WordStar International  Corporation,  a software  company,  from 1984  to  1989,
including Corporate Controller. Ms. Godfrey started her professional career with
KPMG  Peat Marwick. She  is a C.P.A. and  holds a Bachelor  of Science degree in
Accountancy from the University of Illinois, Champaign-Urbana.
 
    GLENN LILLICH  has been  the Company's  Vice President,  Domestic Sales  and
Marketing  since June 1996. From February 1993 to June 1996, Mr. Lillich was the
Company's Vice President, Sales. From January  1992 to December 1992, he  served
as  the Western  Region Director  of Sales for  the Telecom  Division of Stratus
Company, a  manufacturer of  computer systems.  Mr. Lillich  held various  sales
positions  at DSC from 1984  to December 1991, most  recently as Vice President,
Sales;  GTE  Telenet  Systems  Corporation,  a  manufacturer  of  packet  switch
hardware,  from  1980  to  1983; and  Northern  Telecom  Systems  Corporation, a
manufacturer and distributor of data processing systems, from 1978 to 1979.  Mr.
Lillich  holds  a  Bachelor of  Science  degree  in Accounting  from  Ohio State
University and an MBA in Behavioral Management from Pepperdine University.
 
    DAN E. STEIMLE  has been the  Company's Vice President  and Chief  Financial
Officer  since  December 1993.  He  has also  been  the Company's  Secretary and
Treasurer since July  1995. He  was the  Senior Vice  President for  Operations,
Chief  Financial Officer  and Treasurer for  The Santa Cruz  Operations, Inc., a
software company, from 1991 until joining  AFC. Mr. Steimle served as  Corporate
Director  of  Business Development  at  Mentor Graphics  Corporation,  a company
supplying engineering  design software,  from 1989  to September  1991 and  held
various  financial positions  at Cipher Data  Products, Inc.,  a manufacturer of
computer peripherals, from  1982 to  1989, including  Corporate Vice  President,
Chief  Financial Officer and Treasurer. Mr.  Steimle holds a Bachelor of Science
degree in Accounting  from Ohio  State University and  an MBA  in Marketing  and
Management  from the University of Cincinnati. Mr. Steimle is also a director of
Mitek Systems, Inc., a software company.
 
    JAMES HOECK was a  co-founder of the Company  and served as Vice  President,
Engineering  from inception through January 1995  when he became Vice President,
Advanced  Development.  In  November  1990,  he  co-founded  Quadrium   Research
Corporation,  a  design  consulting  company  ("Quadrium"),  and  served  as its
President until May 1992. Previously, Mr. Hoeck served as a manager of  firmware
at Optilink and as a member of the technical staff at Teradyne, Inc., a test and
measurement  equipment company. Mr. Hoeck holds  a Bachelor of Science degree in
Electrical Engineering from Northwestern University.
 
    JOHN WEBLEY was a  co-founder of the Company  and served as Vice  President,
Engineering  from inception through January 1995  when he became Vice President,
Advanced Development. In November 1990,  he co-founded Quadrium with Mr.  Hoeck,
and  served as its Vice President until June 1992. Previously, Mr. Webley served
as manager  of  systems interface  hardware  at Optilink,  as  a member  of  the
technical  staff at  Rockwell International, a  defense contractor,  as a senior
engineer at  Lynch and  as a  network  systems engineer  for the  Department  of
Telecommunications  in Cape Town,  South Africa. Mr. Webley  holds a Bachelor of
Science degree in Electrical Engineering, an Hon. B.Sc. and a Master of  Science
degree  in  Electrical Engineering  from the  University of  Stellenbosch, South
Africa.
 
    DAVID ARNOLD has been the Company's Vice President, Engineering  Development
since April 1996. From November 1993 to November 1995, he was senior director of
telephony products research at Ericsson Raynet, a provider of telecommunications
equipment.  From 1989  to November 1993,  he served as  engineering director for
Alcatel Network Systems, a provider of telecommunications equipment. Previously,
from
 
                                       40
<PAGE>
1978 to 1983,  Mr. Arnold  held a variety  of engineering  positions at  Digital
Equipment Corporation, a provider of computer and data processing equipment. Mr.
Arnold  holds  a  Bachelor  of  Science  degree  in  Computer  Science  from the
University of California, Berkeley.
 
    MICHAEL HATFIELD has  been the Company's  Vice President, International  and
Product Management since June 1996. From September 1992 to June 1996 he was Vice
President,  Marketing.  From  July 1992  to  September  1992, he  served  as the
director of  marketing  for the  synchronization  products division  of  Telecom
Solutions,  Inc., a  telecommunications company.  Previously, Mr.  Hatfield held
various marketing positions at DSC from 1987 to July 1992. Mr. Hatfield holds  a
Bachelor  of  Science  degree  in Electrical  Engineering  from  the Rose-Hulman
Institute of Technology and an MBA in Finance from Indiana University.
 
    PETER KILKUS has been the Company's Vice President, Quality Assurance  since
March  1995. From 1990 to March 1995,  he served as the Senior Director, Quality
Assurance, for DSC. From  1988 to 1990, he  held various positions at  Optilink,
most  recently as Vice President; Operations. Mr.  Kilkus holds an MA in Physics
from the University of California, Santa  Barbara and a Bachelor of Arts  degree
in Physics from St. Mary's University of Minnesota.
 
    GREG  STEELE has been  the Company's Vice  President, Operations since April
1995. Prior to joining the Company, from 1990 to November 1994, Mr. Steele  held
various  positions at  DSC, including director  of account  marketing and senior
manager of manufacturing from 1990 to April 1993. Previously, from 1984 to 1990,
Mr. Steele held several manufacturing positions at Texas Instruments. Mr. Steele
holds a Bachelor of Science degree  in Industrial Engineering from Oregon  State
University.
 
    B.J.  CASSIN has been  a director of  the Company since  January 1993. Since
1979, he has been a private venture capitalist. Previously, he co-founded  Xidex
Corporation,  a manufacturer of data storage media,  in 1969, and served as Vice
President, Marketing. He is currently a director of six private companies.
 
    CLIFFORD H. HIGGERSON has been a director of the Company since January 1993.
Mr. Higgerson  has been  a  general partner  of  Vanguard Ventures  Partners,  a
venture  capital firm  and a  stockholder of  the Company,  since July  1991 and
managing partner of Communications Ventures, a venture capital firm, since 1987.
Mr. Higgerson is  also a  director of  Digital Microwave  Corporation and  eight
private companies.
 
    BRIAN  JACKMAN has been  a director of  the Company since  October 1993. Mr.
Jackman  has   been  the   Executive  Vice   President  of   Tellabs,  Inc.,   a
telecommunications  equipment company and a stockholder  of the Company, and the
President of Tellabs Operations Inc., a subsidiary of Tellabs, Inc., since 1993.
From 1990 to  1993, Mr.  Jackman was the  Executive Vice  President of  Business
Operations   of  Tellabs.   From  1989   to  1990,   he  was   the  Senior  Vice
President/General Manager of the data  communications division of Tellabs,  Inc.
Mr. Jackman is also a director of Tellabs, Inc. and Universal Electronics, Inc.
 
    DAN RASDAL has been a director of the Company since January 1993. Mr. Rasdal
has  been  Chairman of  the Board  of  SymmetriComm, Inc.,  a telecommunications
company, since  July 1989,  and the  President and  Chief Executive  Officer  of
SymmetriComm since 1985.
 
    The  current  directors  have been  elected  pursuant  to the  terms  of the
Company's certificate  of incorporation  and a  voting agreement  among  certain
stockholders  of the Company, whereby holders of Series A and Series B Preferred
Stock of the Company have  the right to elect  three directors in the  aggregate
and the parties to the voting agreement agreed to vote for a director designated
in  accordance with the voting agreement.  Such arrangements will terminate upon
closing of this offering.
 
    Upon closing of  the offering,  the Company's  certificate of  incorporation
will  provide for a  classified Board of Directors  composed of seven directors.
Accordingly, the terms of the office of  the Board of Directors will be  divided
into  three  classes.  Class  I  will  expire  at  the  annual  meeting  of  the
stockholders to be held in 1997; Class  II will expire at the annual meeting  of
the  stockholders to be  held in 1998; and  Class III will  expire at the annual
meeting of the stockholders to  be held in 1999. At  each annual meeting of  the
stockholders,  beginning  with  the  1997  annual  meeting,  the  successors  to
directors whose terms will then expire will be elected to serve from the time of
election and qualification until the third annual meeting following election and
until their successors  have been  duly elected  and qualified,  or until  their
earlier
 
                                       41
<PAGE>
resignation  or removal,  if any.  Carl Grivner  and Clifford  Higgerson will be
designated as  Class  I  directors.  B.J.  Cassin  and  Brian  Jackman  will  be
designated as Class II directors. Donald Green and Dan Rasdal will be designated
as  Class  III  directors. A  seventh  director  will be  nominated  as  soon as
practicable upon  the  closing of  this  offering. To  the  extent there  is  an
increase   in  the  number  of  directors,  additional  directorships  resulting
therefrom will be  distributed among  the three classes  so that,  as nearly  as
possible, each class will consist of an equal number of directors.
 
    Each  executive officer  and key  employee serves  at the  discretion of the
Board of Directors. The Company does not have any existing employment agreements
with any executive officer  or key employee. There  are no family  relationships
among any of the directors, executive officers and key employees of the Company.
 
BOARD COMMITTEES
 
    The Board of Directors has two standing committees: an Audit Committee and a
Compensation  Committee. The  Audit Committee,  currently consisting  of Messrs.
Cassin, Higgerson and Rasdal, meets with the Company's financial management  and
its  independent  accountants  at various  times  during each  year  and reviews
internal control conditions,  audit plans and  results, and financial  reporting
procedures.   The  Compensation  Committee,   currently  consisting  of  Messrs.
Higgerson  and  Jackman,  reviews   and  approves  the  Company's   compensation
arrangements for key employees and administers the 1996 Stock Incentive Plan and
the Employee Stock Purchase Plan.
 
DIRECTOR COMPENSATION
 
    Non-employee  Board members will not receive any cash fees for their service
on the Board or any Board committee, but they will be entitled to  reimbursement
of  all  reasonable out-of-pocket  expenses  incurred in  connection  with their
attendance at  Board and  Board committee  meetings. In  addition,  non-employee
Board  members will receive stock options pursuant to the automatic option grant
program in effect under the Company's 1996 Stock Incentive Plan. See `` -- Stock
Incentive Plan" for further information concerning this program.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
    The Company's certificate of incorporation limits the liability of directors
to the maximum extent permitted by  Delaware law. This provision is intended  to
allow  the Company's directors  the benefit of  Delaware General Corporation Law
which provides  that  directors of  Delaware  corporations may  be  relieved  of
monetary  liabilities for breach of their  fiduciary duties as directors, except
under certain circumstances, including breach of their duty of loyalty, acts  or
omissions  not in  good faith or  involving intentional misconduct  or a knowing
violation of law, unlawful payments  or dividends or unlawful stock  repurchases
or  redemptions or any  transaction from which the  director derived an improper
personal benefit. As a result, the Company and its stockholders may be unable to
obtain monetary damages  from a director  for breach of  duty of care.  Although
stockholders  may continue to  seek injunctive or other  equitable relief for an
alleged breach of fiduciary  duty by a director,  stockholders may not have  any
effective  remedy against the  challenged conduct if  equitable remedies are not
available. In  addition, the  Company's bylaws  provide that  the Company  shall
indemnify its executive officers and directors to the fullest extent provided by
Delaware  law. The bylaws also authorize  the use of indemnification agreements,
and the Company has entered into such agreements with each of its directors  and
executive  officers. Prospective  investors should be  aware that  the effect of
such indemnification provisions may be to shift to the Company liabilities which
may otherwise have been payable by individual directors or officers. Insofar  as
indemnification for liabilities arising under the Securities Act may be provided
to  the Company's executive officers and directors, the Company has been advised
that,  in  the  opinion  of   the  Securities  and  Exchange  Commission,   such
indemnification is against public policy as expressed in the Securities Act, and
is, therefore, unenforceable.
 
    The  Company intends to obtain officer and director liability insurance with
respect to liabilities arising out of certain matters, including matters arising
under the Securities Act.
 
    There is no pending litigation or proceeding involving a director,  officer,
employee  or other  agent of  the Company as  to which  indemnification is being
sought, nor is the Company aware of any threatened litigation that may result in
claims for indemnification by any director, officer, employee or other agent.
 
                                       42
<PAGE>
EXECUTIVE COMPENSATION
 
    SUMMARY OF CASH AND OTHER COMPENSATION.  The following table sets forth  the
compensation  earned by the  Company's Chief Executive  Officer, three executive
officers who were serving as  such at the end of  1995 and one former  executive
officer  (the ``Named Executive Officers"), each of whose aggregate compensation
for the year  ended December 31,  1995 was  in excess of  $100,000 for  services
rendered in all capacities to the Company for such fiscal year.
 
<TABLE>
<CAPTION>
                                                                        LONG-TERM
                                                                      COMPENSATION
                                                                      -------------
                                                                        NUMBER OF
                                               ANNUAL COMPENSATION     SECURITIES
                                              ----------------------   UNDERLYING      ALL OTHER
NAME AND PRINCIPAL POSITION                     SALARY      BONUS        OPTIONS     COMPENSATION
- --------------------------------------------  ----------  ----------  -------------  -------------
<S>                                           <C>         <C>         <C>            <C>
Donald Green (1) ...........................  $  185,000  $  115,625       25,000         --
 Chairman of the Board and Chief Executive
 Officer
Carl J. Grivner (2) ........................     102,115      48,894      212,000      $  14,690(3)
 President and Chief Operating Officer
Glenn Lillich ..............................     160,000      54,400       12,000         --
 Vice President, Domestic Sales and
 Marketing
Dan E. Steimle .............................     160,000      54,400       12,000         --
 Vice President, Chief Financial Officer,
 Treasurer and Secretary
Carlos Baradello (4) .......................     153,846      65,000       129,000        166,013 (3)
 Vice President, Engineering Development
</TABLE>
 
- ---------
(1) On May 31, 1995, Mr. Green purchased 167,200 shares of Common Stock from the
    Company  in exchange for a  note payable in the  amount of $52,250, the fair
    market value  of  such shares  on  such  date, pursuant  to  a  compensation
    agreement  approved by the Board of Directors.  The Company has the right to
    repurchase such shares  at the original  purchase price per  share upon  Mr.
    Green's  cessation of service prior to vesting in such shares and a right of
    first refusal  in connection  with transfers  of such  shares prior  to  the
    Company's initial public offering. See ``Certain Transactions."
 
(2)  Mr. Grivner  joined the Company  in July 1995  at an annual  base salary of
    $225,000.
 
(3) Represents relocation expenses paid by the Company.
 
(4) Mr. Baradello resigned from the Company effective May 1996.
 
    In 1996, the Company  instituted a bonus program  pursuant to which  bonuses
will  be paid  to executive officers  based on Company  performance targets. The
aggregate bonuses  to be  paid under  this program  are limited  to 15%  of  the
Company's income before income taxes.
 
                                       43
<PAGE>
    STOCK  OPTION GRANTS TO  NAMED EXECUTIVE OFFICERS.  The following table sets
forth certain information  regarding stock  option grants  made to  each of  the
Named  Executive Officers in 1995. No  stock appreciation rights were granted to
the Named Executive Officers during such year.
 
<TABLE>
<CAPTION>
                                                      INDIVIDUAL GRANTS (1)                    POTENTIAL REALIZABLE
                                     --------------------------------------------------------    VALUE AT ASSUMED
                                      NUMBER OF                                                ANNUAL RATES OF STOCK
                                     SECURITIES     PERCENT OF                                  PRICE APPRECIATION
                                     UNDERLYING    TOTAL GRANTED     PER SHARE                  FOR OPTION TERM (2)
                                       OPTIONS    TO EMPLOYEES IN    EXERCISE     EXPIRATION   ---------------------
NAME                                   GRANTED      FISCAL YEAR    BASE PRICE(3)     DATE         5%         10%
- -----------------------------------  -----------  ---------------  -------------  -----------  ---------  ----------
<S>                                  <C>          <C>              <C>            <C>          <C>        <C>
Donald Green.......................      25,000            2.0%      $  1.50        12/12/05   $  23,584  $   59,765
Carl J. Grivner....................     200,000           15.7          0.625       08/15/05      78,612     199,218
                                         12,000            0.9          1.50        12/12/05      11,320      28,687
Glenn Lillich......................      12,000            0.9          1.50        12/12/05      11,320      28,687
Dan E. Steimle.....................      12,000            0.9          1.50        12/12/05      11,320      28,687
Carlos Baradello...................     120,000            9.4          0.3125      01/18/05      23,584      59,765
                                          9,000            0.7          1.50        12/12/05       8,490      21,516
</TABLE>
 
- ---------
(1) Each option is immediately exercisable  for all the option shares.  However,
    any  shares purchased under the option will  be subject to repurchase by the
    Company, at the  exercise price paid  per share, in  the event the  optionee
    terminates  employment prior to  vesting in those  shares. Twenty percent of
    the option  shares will  vest  upon optionee's  completion  of one  year  of
    service  measured  from  the vesting  date,  and  the balance  will  vest in
    successive equal monthly  installments over  the next 48  months of  service
    thereafter.  All the  option shares will  immediately vest in  the event the
    Company is acquired by merger or asset sale, unless the options are  assumed
    by the acquiring entity.
 
(2)  Realizable values are reported net of the option exercise price. The dollar
    amounts under these columns are the result of calculations based upon  stock
    price  appreciation at  the assumed 5%  and 10% compounded  annual rates (as
    applied to the estimated fair market value of the option shares on the  date
    of  grant, not the  current fair market  value of those  shares) and are not
    intended to forecast any actual or potential future appreciation, if any, in
    the value  of the  Company's stock  price. Actual  gains, if  any, on  stock
    option exercises will be dependent upon the future performance of the Common
    Stock  as  well  as the  option  holder's continued  employment  through the
    vesting period. The potential realizable value calculation assumes that  the
    option holder waits until the end of the option term to exercise the option.
 
(3)  The exercise price for the shares  of Common Stock subject to option grants
    made under the Plan may be paid in cash or in shares of Common Stock  valued
    at  fair market value on the exercise date. The option may also be exercised
    through a same-day sale program without any cash outlay by the optionee.  In
    addition,  the Plan Administrator may provide financial assistance to one or
    more optionees in the exercise of their outstanding options by allowing such
    individuals to deliver a full-recourse, interest-bearing promissory note  in
    payment  of the exercise price and any associated withholding taxes incurred
    in connection with such exercise.
 
    On June 25, 1996, non-qualified stock options exercisable for 184,902 shares
of Common Stock, with a per share exercise price of $12.50, were granted to  Mr.
Green.  Such options vest ratably on a monthly basis over a two year period from
the date of the grant.
 
                                       44
<PAGE>
    OPTION EXERCISES  AND HOLDINGS.    The following  table sets  forth  certain
information with respect to the Named Executive Officers concerning their option
holdings  for 1995. No options were exercised by the Named Executive Officers in
1995, and no stock appreciation rights were exercised or were outstanding at the
end of such year.
 
<TABLE>
<CAPTION>
                                        NUMBER OF SECURITIES
                                       UNDERLYING UNEXERCISED        VALUE OF UNEXERCISED
                                              OPTIONS                IN-THE-MONEY OPTIONS
                                      AT DECEMBER 31, 1995 (1)     AT DECEMBER 31, 1995 (2)
                                     --------------------------  ----------------------------
<S>                                  <C>          <C>            <C>            <C>
NAME                                 EXERCISABLE  UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
- -----------------------------------  -----------  -------------  -------------  -------------
Donald Green.......................      41,334         63,666    $    60,968    $    57,032
Carl J. Grivner....................      --            212,000        --             175,000
Glenn Lillich......................     110,932        137,068        160,175        170,675
Dan E. Steimle.....................      77,334        134,666        111,768        171,732
Carlos Baradello...................      --            129,000        --             142,500
</TABLE>
 
- ---------
(1) Although each option is immediately  exercisable for all the option  shares,
    any  shares  purchased under  the option  are subject  to repurchase  by the
    Company, at the  exercise price paid  per share, in  the event the  optionee
    terminates  employment prior to  vesting in those  shares. Twenty percent of
    the option  shares will  vest  upon optionee's  completion  of one  year  of
    service  measured  from  the vesting  date,  and  the balance  will  vest in
    successive equal monthly  installments over  the next 48  months of  service
    thereafter.  All the  option shares will  immediately vest in  the event the
    Company is acquired by merger or asset sale, unless the options are  assumed
    by  the acquiring entity. Accordingly, the table reflects such option shares
    as to which the repurchase right  has lapsed under the "exercisable"  column
    and   such  option  shares  subject  to   the  repurchase  right  under  the
    "unexercisable" column.
 
(2) Based on the fair market value of the Company's Common Stock at December 31,
    1995 ($1.50 per  share as  determined by the  Board of  Directors) less  the
    exercise price payable for such shares.
 
    Mr.  Steimle exercised  options for 160,000  shares of Common  Stock in June
1996 at an exercise price of $0.025 per share.
 
TERMINATION OF EMPLOYMENT AND CHANGE IN CONTROL ARRANGEMENTS
 
    The Compensation Committee as Plan Administrator of the 1996 Stock Incentive
Plan has the authority to provide for  the accelerated vesting of the shares  of
Common  Stock subject to outstanding options held by the Chief Executive Officer
and the Company's other executive officers or any unvested shares actually  held
by  those individuals  under the  1996 Stock  Incentive Plan,  in the  event the
Company is acquired  by merger or  asset sale or  there is a  hostile change  in
control  effected by a successful tender or  exchange offer for more than 50% of
the Company's outstanding voting securities or  a change in the majority of  the
Board  as a  result of  one or  more contested  elections for  Board membership.
Alternatively, the Compensation Committee may condition such accelerated vesting
upon  the  individual's  termination  of  service  within  a  designated  period
following  the  acquisition  or  hostile  change in  control.  See  ``  -- Stock
Incentive Plan."
 
STOCK INCENTIVE PLAN
 
    The Company's 1996 Stock  Incentive Plan (the ``1996  Plan") is intended  to
serve  as the  successor equity  incentive program  to the  Company's 1993 Stock
Option/Stock Issuance Plan (the ``Predecessor Plan"). The 1996 Plan was  adopted
by  the Board of Directors on July 12,  1996 and approved by the stockholders in
August 1996. A  total of 7,175,676  shares of Common  Stock have initially  been
authorized  for  issuance under  the 1996  Plan. This  initial share  reserve is
comprised of (i)  the shares  which remained  available for  issuance under  the
Predecessor   Plan,  including   the  shares  subject   to  outstanding  options
thereunder, plus (ii) an additional increase of 1,000,000 shares. As of June 30,
1996, there  were options  to purchase  4,076,918 shares  under the  Predecessor
Plan.  In addition,  the share  reserve will  automatically be  increased on the
first trading day of each calendar year, beginning with the 1997 calendar  year,
by  an amount equal to 3% of the number of shares of Common Stock outstanding on
the last trading day of the immediately preceding calendar year. However, in  no
event  may any one participant in the  1996 Plan receive option grants or direct
stock issuances for more than 400,000 shares in the aggregate per calendar year.
The 1996 Plan  is administered  by the Compensation  Committee of  the Board  of
Directors (the ``Plan Administrator").
 
                                       45
<PAGE>
    Outstanding options under the Predecessor Plan will be incorporated into the
1996  Plan upon the closing of this  offering, and no further option grants will
be made under the Predecessor Plan. The incorporated options will continue to be
governed by their existing terms, unless the Plan Administrator elects to extend
one or more  features of  the 1996  Plan to  those options.  However, except  as
otherwise  noted  below,  the  outstanding options  under  the  Predecessor Plan
contain substantially the  same terms  and conditions summarized  below for  the
Discretionary Option Grant Program in effect under the 1996 Plan.
 
    The   1996  Plan  is   divided  into  five   separate  components:  (i)  the
Discretionary Option  Grant Program,  under which  eligible individuals  in  the
Company's  employ or service (including officers, non-employee Board members and
consultants) may,  at  the discretion  of  the Plan  Administrator,  be  granted
options  to purchase shares of  Common Stock at an  exercise price not less than
85% of  their fair  market value  on the  grant date;  (ii) the  Stock  Issuance
Program   under  which  such  individuals   may,  in  the  Plan  Administrator's
discretion, be issued shares  of Common Stock directly  through the purchase  of
such shares at a price not less than 100% of their fair market value at the time
of  issuance or as a bonus tied to the performance of services; (iii) the Salary
Investment  Option  Grant  Program  under  which,  if  activated  by  the   Plan
Administrator  for a given year, executive officers and other highly compensated
employees may elect to apply a portion of their base salary for such year to the
acquisition of  special below-market  stock option  grants; (iv)  the  Automatic
Option  Grant Program  under which option  grants will automatically  be made at
periodic intervals to eligible non-employee Board members to purchase shares  of
Common  Stock at an exercise  price equal to 100% of  their fair market value on
the grant date; and (v) the Director  Fee Option Grant Program, if activated  by
the  Plan Administrator  for a  given year,  pursuant to  which the non-employee
Board members may apply  all or a  portion of the annual  retainer fee, if  any,
otherwise  payable  to them  in cash  each  year to  the acquisition  of special
below-market option grants.
 
    The Plan  Administrator will  have complete  discretion to  determine  which
eligible  individuals are to receive option  grants or stock issuances under the
Discretionary Option Grant,  Salary Investment  Option Grant  or Stock  Issuance
Programs, the time or times when such option grants or stock issuances are to be
made, the number of shares subject to each such grant or issuance, the status of
any  granted option as either an incentive stock option or a non-statutory stock
option under the Federal tax laws, the vesting schedule to be in effect for  the
option grant or stock issuance and the maximum term for which any granted option
is to remain outstanding. Generally, options will be immediately exercisable for
all  the option shares. However,  any shares purchased under  the option will be
subject to repurchase by the Company, at  the exercise price paid per share,  in
the  event the optionee terminates employment  prior to vesting in those shares.
The administration of the Automatic Option  Grant and Director Fee Option  Grant
Programs  will be  self-executing in accordance  with the  express provisions of
each such program.
 
    The exercise price for the shares  of Common Stock subject to option  grants
made  under the Plan may be paid in cash  or in shares of Common Stock valued at
fair market value on the exercise date. The option may also be exercised through
a same-day sale program  without any cash outlay  by the optionee. In  addition,
the Plan Administrator may provide financial assistance to one or more optionees
in  the exercise  of their outstanding  options by allowing  such individuals to
deliver a  full-recourse, interest-bearing  promissory note  in payment  of  the
exercise  price and any associated withholding taxes incurred in connection with
such exercise.
 
    In the event  that the Company  is acquired  by merger or  asset sale,  each
outstanding  option under the Discretionary Option Grant Program which is not to
be assumed by the successor  corporation will automatically accelerate in  full,
and  all unvested shares under the Stock Issuance Program will immediately vest,
except to  the extent  the Company's  repurchase rights  with respect  to  those
shares  are to be assigned to  the successor corporation. The Plan Administrator
will have the authority under the Discretionary Option Grant and Stock  Issuance
Programs  to grant options and to structure repurchase rights so that the shares
subject to those  options or repurchase  rights will automatically  vest in  the
event the individual's service is terminated, whether involuntarily or through a
resignation  for good reason, within a  specified period (not to exceed eighteen
(18) months) following (i)  a merger or  asset sale in  which those options  are
assumed  or those  repurchase rights  are assigned or  (ii) a  hostile change in
control of the Company effected by a  successful tender offer for more than  50%
of  the outstanding voting stock  or by proxy contest  for the election of Board
 
                                       46
<PAGE>
members. The Plan Administrator will also have the discretion to provide for the
automatic acceleration of outstanding options  and the lapse of any  outstanding
repurchase  rights upon (i) a hostile change  in control of the Company effected
by a successful  tender offer  for more than  50% of  the Company's  outstanding
voting  stock or by proxy contest for the  election of Board members or (ii) the
termination of  the individual's  service, whether  involuntarily or  through  a
resignation  for good reason, within a  specified period (not to exceed eighteen
(18) months)  following such  a  hostile change  in control.  Options  currently
outstanding  under the Predecessor  Plan will accelerate  upon an acquisition of
the Company by merger  or asset sale,  unless those options  are assumed by  the
acquiring  entity, but  such options  are not  subject to  acceleration upon the
termination of the optionee's  service following an  acquisition in which  those
options are assumed or a hostile change in control of the Company.
 
    Stock   appreciation   rights  are   authorized   for  issuance   under  the
Discretionary Option Grant Program which  provide the holders with the  election
to surrender their outstanding options for an appreciation distribution from the
Company equal to the excess of (i) the fair market value of the vested shares of
Common  Stock subject to the surrendered option over (ii) the aggregate exercise
price payable for  such shares. Such  appreciation distribution may  be made  in
cash  or in  shares of  Common Stock. There  are currently  no outstanding stock
appreciation rights under the Predecessor Plan.
 
    The Plan  Administrator has  the  authority to  effect the  cancellation  of
outstanding  options  under the  Discretionary  Option Grant  Program (including
options incorporated from the Predecessor Plan)  in return for the grant of  new
options for the same or different number of option shares with an exercise price
per  share based upon the fair market value of the Common Stock on the new grant
date.
 
    In the event the Plan Administrator elects to activate the Salary Investment
Option Grant Program for one or more calendar years, each executive officer  and
other  highly compensated employee of the Company selected for participation may
elect, prior to the start of the calendar year, to reduce his or her base salary
for that calendar year by  a specified dollar amount  not less than $10,000  nor
more  than $50,000. If such election is  approved by the Plan Administrator, the
officer will  be  granted, as  soon  as practical  following  the start  of  the
calendar year for which the salary reduction is to be in effect, a non-statutory
option  to purchase that number of shares of Common Stock determined by dividing
the salary reduction amount by two-thirds of the fair market value per share  of
Common  Stock on the grant  date. The option will be  exercisable at a price per
share equal to one-third of  the fair market value of  the option shares on  the
grant  date. As a result, the  total spread on the option  shares at the time of
grant will be equal to the amount of salary invested in that option. The  option
will  vest  in a  series  of twelve  (12)  equal monthly  installments  over the
calendar year for which the salary reduction is in effect and will be subject to
full and immediate vesting upon certain  changes in the ownership or control  of
the Company.
 
    Under  the Automatic Option  Grant Program, each  individual who first joins
the Board after June  30, 1996 as  a non-employee Board  member will receive  an
option  grant  for 20,000  shares of  Common Stock  at  the time  of his  or her
commencement of Board service, provided  such individual has not otherwise  been
in  the prior  employ of  the Company.  In addition,  at each  annual meeting of
stockholders, beginning with the 1997 annual meeting, each individual who is  to
continue  to  serve as  a non-employee  Board  will receive  an option  grant to
purchase 6,000 shares of Common Stock,  whether or not such individual has  been
in  the prior  employ of the  Company and  whether or not  such individual first
joined the Board after June 30,  1996, provided that such individual has  served
as a non-employee Board member for at least six months.
 
    Each  automatic grant will have  an exercise price equal  to the fair market
value per share of Common Stock on the  grant date and will have a maximum  term
of  10 years, subject to earlier  termination following the optionee's cessation
of Board  service.  Each  automatic  option  will  be  immediately  exercisable;
however,  any shares purchased  upon exercise of  the option will  be subject to
repurchase, at the option exercise price  paid per share, should the  optionee's
service  as a non-employee  Board member cease  prior to vesting  in the shares.
Each automatic  option grant  will vest  in a  series of  installments over  the
optionee's  period of Board  service as follows: one-third  of the option shares
upon completion of  one year of  Board service, and  the balance in  twenty-four
(24)  successive equal  monthly installments  upon the  optionee's completion of
each
 
                                       47
<PAGE>
additional month of Board service  thereafter. However, each outstanding  option
will  immediately vest upon (i)  certain changes in the  ownership or control of
the Company or (ii) the death or  disability of the optionee while serving as  a
Board member.
 
    Should  the Director  Fee Option Grant  Program be activated  in the future,
each non-employee Board  member would  have the opportunity  to apply  all or  a
portion  of the annual  retainer fee, if  any, otherwise payable  in cash to the
acquisition of a below-market option grant. The option grant would automatically
be made on the first trading day in  January in the year for which the  retainer
fee  would otherwise be payable in cash.  The option will have an exercise price
per share equal to one-third  of the fair market value  of the option shares  on
the  grant  date,  and  the number  of  shares  subject to  the  option  will be
determined by dividing the amount of the retainer fee applied to the program  by
two-thirds of the fair market value per share of Common Stock on the grant date.
As a result, the total spread on the option (the fair market value of the option
shares  on the grant  date less the  aggregate exercise price  payable for those
shares) will  be equal  to the  portion of  the retainer  fee invested  in  that
option.  The option will become exercisable for the option shares in a series of
installments over the optionee's period of Board service as follows: one half of
the option shares will become exercisable upon the optionee's completion of  six
(6) months of Board service during the calendar year of the option grant and the
balance will become exercisable in six (6) successive equal monthly installments
upon  his or her  completion of each  additional month of  Board service in such
calendar year. However, the option  will become immediately exercisable for  all
the  option  shares upon  certain changes  in  the ownership  or control  of the
Company.
 
    The Board may amend or modify the 1996 Plan at any time. The 1996 Plan  will
terminate on June 30, 2006, unless sooner terminated by the Board.
 
EMPLOYEE STOCK PURCHASE PLAN
 
    The  Company's  Employee  Stock  Purchase Plan  (the  ``Purchase  Plan") was
adopted by  the  Board  of Directors  on  July  12, 1996  and  approved  by  the
stockholders  in August  1996. The Purchase  Plan is designed  to allow eligible
employees of the Company  and participating subsidiaries  to purchase shares  of
Common   Stock,  at  semi-annual  intervals,   through  their  periodic  payroll
deductions under the Purchase Plan, and a reserve of 1,500,000 shares of  Common
Stock has been established for this purpose.
 
    The  Purchase Plan  will be implemented  in a series  of successive offering
periods, each  with  a maximum  duration  of  24 months.  However,  the  initial
offering  period will begin on the day the Underwriting Agreement is executed in
connection with this  Offering and will  end on  the last business  day in  July
1998.
 
    All   individuals  employed  by  the  Company  (or  any  current  or  future
participating subsidiary) will be eligible  to participate in the Purchase  Plan
if they are regularly scheduled to work more than twenty (20) hours per week for
more than five (5) calendar months per year.
 
    Individuals  who are  eligible employees on  the start date  of any offering
period may enter  the Purchase  Plan on  that start  date or  on any  subsequent
semi-annual  entry  date (February  1 or  August 1  each year).  Individuals who
become eligible employees after the start  date of the offering period may  join
the Purchase Plan on any subsequent semi-annual entry date within that period.
 
    Payroll  deductions may not exceed 10%  of the participant's base salary for
each semi-annual period of participation, and the accumulated payroll deductions
will be applied to the  purchase of shares on  the participant's behalf on  each
semi-annual purchase date (January 31 and July 31 each year, with the first such
purchase  date to occur on  January 31, 1997) at a  purchase price per share not
less than eighty-five percent (85%) of the LOWER of (i) the fair market value of
the Common Stock  on the participant's  entry date into  the offering period  or
(ii)  the  fair market  value on  the  semi-annual purchase  date. In  no event,
however, may  any  participant  purchase  more than  1,500  shares  on  any  one
semi-annual  purchase date. Should the fair market  value of the Common Stock on
any semi-annual purchase date be less than  the fair market value of the  Common
Stock  on the first day of the offering period, then the current offering period
will automatically end, and  a new twenty-four  (24)-month offering period  will
begin, based on the lower fair market value.
 
                                       48
<PAGE>
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    The  Board of  Directors established a  Compensation Committee  in May 1994.
During the last fiscal year, Messrs. Higgerson and Jackman served as members  of
the  Compensation Committee. Neither of these individuals has served at any time
as an officer  or employee of  the Company.  Prior to the  establishment of  the
Compensation  Committee, all  decisions relating to  executive compensation were
made by the Company's Board of Directors. For a description of the  transactions
between  the  Company and  members of  the  Compensation Committee  and entities
affiliated with such members, see  "Certain Transactions." No executive  officer
of  the Company  serves as a  member of  the board of  directors or compensation
committee of any entity which  has one or more  executive officers serving as  a
member of the Company's Board of Directors or Compensation Committee.
 
                                       49
<PAGE>
                              CERTAIN TRANSACTIONS
 
    Since  its inception, the Company has  issued and sold, in private placement
transactions, shares of Preferred Stock and warrants to purchase Common Stock to
the Company's executive officers, directors and/or greater than 5%  stockholders
as follows:
 
<TABLE>
<CAPTION>
                                                         COMMON      COMMON      COMMON      COMMON
                                                       EQUIVALENT  EQUIVALENT  EQUIVALENT  EQUIVALENT
                                                       SHARES OF   SHARES OF   SHARES OF   SHARES OF
                                                        SERIES A    SERIES B    SERIES C    SERIES D       COMMON
                                                       PREFERRED   PREFERRED   PREFERRED   PREFERRED        STOCK
INVESTOR (1)                                           STOCK (2)   STOCK (3)   STOCK (4)   STOCK (5)      WARRANTS
- -----------------------------------------------------  ----------  ----------  ----------  ----------  ---------------
<S>                                                    <C>         <C>         <C>         <C>         <C>
B.J. Cassin..........................................   1,285,458     175,029     109,656      --          339,908(6)
Coral Partners II....................................      43,862       6,838   1,353,462     208,487    1,234,280(7)
Donald Green.........................................     681,552      --          --          --          294,044(8)
Harris Corporation...................................      --          --         877,248      87,725      800,000(9)
Dan E. Steimle.......................................      --          --           5,483      --            5,000(10)
St. Paul Venture Capital, Inc........................   1,485,720     231,602     439,655     263,174      831,880(11)
Tellabs, Inc. (12)...................................      --       1,141,322      13,176   1,403,597    1,352,836(13)
Vanguard IV, L.P. (14)...............................   1,485,720     231,602     351,956      87,725      779,464(15)
</TABLE>
 
- ---------
 (1)  Shares held by  all affiliated persons and  entities have been aggregated.
    See "Principal  Stockholders"  for  more  detail on  shares  held  by  these
    purchasers.
 
 (2) Shares of Series A Preferred Stock were issued in January and April 1993 at
    an effective common equivalent per share price of $0.45597.
 
 (3)  Shares  of Series  B Preferred  Stock were  issued in  October 1993  at an
    effective common equivalent per share price of $2.27985.
 
 (4) Shares of Series C Preferred Stock were issued in March and May 1994 at  an
    effective common equivalent per share price of $2.27985.
 
 (5)  Shares  of Series  D Preferred  Stock were  issued in  October 1994  at an
    effective common equivalent per share price of $2.84982.
 
 (6) 80,292 of these Common Stock  Warrants were exercised in February 1995,  at
    the  following  exercise prices:  6,472 at  $0.025 per  share and  73,820 at
    $0.125 per share. The remaining 259,616  warrants have an exercise price  of
    $1.165 per share.
 
 (7) These Common Stock Warrants have an exercise price of $1.165 per share.
 
 (8)  These Common Stock Warrants have the following exercise prices: 255,316 at
    $0.025 per share and 38,728 at $0.125 per share.
 
 (9) These Common Stock Warrants have an exercise price of $1.165 per share.
 
(10) These Common  Stock Warrants  were exercised in  July 1995  at an  exercise
    price of $1.165 per share.
 
(11)  These Common Stock  Warrants have the following  exercise prices: 6,472 at
    $0.025 per share, 63,260 at $0.125 per share, 150,000 at $0.25 per share and
    612,148 at $1.165 per share.
 
(12) Brian Jackman, an affiliate of Tellabs, is a director of the Company.
 
(13) 1,042,836 of these Common Stock Warrants  were exercised in May 1995 at  an
    exercise  price of $1.165 per share. The remaining 310,000 warrants have the
    following exercise prices: 300,000 at $0.25  per share and 10,000 at  $1.165
    per share.
 
(14)  Clifford H.  Higgerson, an  affiliate of  Vanguard, is  a director  of the
    Company.
 
(15) These Common Stock  Warrants have the following  exercise prices: 6,472  at
    $0.025 per share, 70,820 at $0.125 per share, 150,000 at $0.25 per share and
    552,172 at $1.165 per share.
 
                                       50
<PAGE>
    The  foregoing table  has been  adjusted to  reflect the  conversion of each
outstanding share of Series A, Series B,  Series C and Series D Preferred  Stock
of  the  Company  into 1.09656  shares  of  Common Stock  upon  closing  of this
offering. Each holder of such shares  of Common Stock issued upon conversion  of
Preferred Stock is entitled to certain registration rights. See ``Description of
Capital Stock -- Registration Rights."
 
    In  connection with  the issuance and  sale of Preferred  Stock, the Company
entered into an indemnity  agreement with its  Preferred Stock investors  (other
than investors of Series F Preferred Stock) pursuant to which the Company agreed
to indemnify such investors from the financial dilution they may experience as a
result  of  the  costs  and  potential liabilities  of  the  Company  arising in
connection with the  DSC litigation. In  connection with the  settlement of  the
litigation  with DSC, the Company entered into an Amended and Restated Indemnity
Agreement (the "Amended Indemnity Agreement")  with such investors. Pursuant  to
the  Amended Indemnity Agreement,  the indemnification was  limited to the costs
and expenses  of the  litigation  and was  effected  by amending  the  Company's
Articles of Incorporation in August 1996 to adjust the rate at which each series
of Preferred Stock (other than Series F) converts into Common Stock. The rate at
which  each share of Series  A, Series B, Series C  and Series D Preferred Stock
was adjusted so that  each of such  shares will convert  into 1.09656 shares  of
Common  Stock  and each  share of  Series  E Preferred  Stock will  convert into
1.02529  shares  of  Common  Stock.  Such  conversion  into  Common  Stock  will
automatically occur upon the consummation of the offering. Upon amendment of the
Articles  of Incorporation in  August 1996, the  Amended Indemnity Agreement was
terminated and  no further  indemnification obligation  remains. See  Note 9  of
Notes to Consolidated Financial Statements.
 
    In October 1995, the Company loaned to Carl Grivner, the President and Chief
Operating  Officer  of  the  Company,  the sum  of  $100,000  to  assist  him in
relocating to Northern California. Such loan bears interest at the rate of 6.37%
per annum, with accrued  interest due and  payable annually on  July 19 of  each
year,  and  the  principal  of such  loan  is  due and  payable  in  three equal
installments on July 19 of 1996, 1997 and 1998. As of June 30, 1996, the  entire
principal balance of this loan remains outstanding.
 
    In  May 1995, the  Company issued an  aggregate of 563,600  shares of Common
Stock at $0.3125  per share to  certain key employees  pursuant to  compensation
agreements approved by the Company's Board of Directors. In connection with such
issuance,  each such employee paid for the restricted stock by issuing a secured
note payable to the Company. The Company has the right to repurchase such  stock
at  the  original purchase  price per  share upon  the purchaser's  cessation of
service prior  to vesting  in  such shares.  The  repurchase right  lapses  with
respect  to the shares, and each purchaser  vests in his shares, as follows: 20%
of the shares upon completion of one  year of service measured from the date  of
issuance,  and the balance of the shares in a series of equal successive monthly
installments upon the purchaser's  completion of each of  the next 48 months  of
service  thereafter. Such stock is also subject  to the Company's right of first
refusal, which is  exercisable in  the event the  purchaser decides  to sell  or
otherwise  transfer  any of  the shares  purchased prior  to the  initial public
offering of Common Stock. Donald  Green, the Company's Chief Executive  Officer,
purchased  167,200  shares of  Common Stock  and  issued a  note payable  to the
Company in the amount  of $52,250. The  note is secured  by shares of  Preferred
Stock owned by Mr. Green. Such note bears interest at the rate of 6.5% per annum
with  the entire  principal balance  of the note,  together with  all accrued or
unpaid interest, due and payable on December 13, 2000.
 
    AFC and Harris, a stockholder of  the Company, entered into an agreement  in
1995  to form  a joint  venture to manufacture,  distribute and  support the UMC
system in India. The  joint venture includes formation  of a holding company  in
Mauritius,  owned 51% by AFC and 49% by  Harris, which in turn intends to form a
joint venture in India with local  Indian partners following receipt of  certain
government  approvals. To  date, the  parties have  identified and  selected two
Indian companies that  will collectively  own 34% of  the Indian  venture to  be
located in Delhi. See "Business -- Markets and Customers."
 
    AFC  and  Tellabs, a  stockholder  of the  Company,  entered into  a general
partnership in 1994 to design, develop, manufacture and distribute a new product
line derived from the UMC system. AFC contributed a non-exclusive license to use
the UMC technology,  Tellabs contributed  cash to  the joint  venture, and  each
received defined marketing rights for the developed technology. See "Business --
Markets and Customers."
 
                                       51
<PAGE>
    The  Company has granted  options to certain of  its directors and executive
officers.  See   ``Management  --   Executive  Compensation"   and   ``Principal
Stockholders."
 
    The  Company believes that all of the transactions set forth above were made
on terms no less  favorable to the  Company than could  have been obtained  from
unaffiliated  third parties. The  Company intends that  all future transactions,
including loans,  between the  Company and  its officers,  directors,  principal
stockholders  and their  affiliates be  approved by a  majority of  the Board of
Directors, including a  majority of  the independent  and disinterested  outside
directors  on the Board of  Directors, and be on terms  no less favorable to the
Company than could be obtained from unaffiliated third parties.
 
                                       52
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The following table sets forth certain information regarding the  beneficial
ownership  of the Company's Common Stock as of  June 30, 1996 and as adjusted to
reflect the sale of shares of Common Stock offered hereby by (i) each person (or
group of affiliated  persons) who is  known by the  Company to own  beneficially
more  than 5% of the outstanding shares of the Common Stock of the Company, (ii)
each executive officer of the Company,  (iii) each director of the Company,  and
(iv)  all  directors and  executive  officers of  the  Company as  a  group. The
following table has been adjusted to reflect the conversion of each  outstanding
share  of Series A, Series B, Series C and Series D Preferred Stock into 1.09656
shares of Common Stock, each outstanding share of Series E Preferred Stock  into
1.02529 shares of Common Stock, and each outstanding share of Series F Preferred
Stock into 1 share of Common Stock.
 
<TABLE>
<CAPTION>
                                                                                PERCENT OF TOTAL SHARES
                                                       NUMBER OF SHARES         BENEFICIALLY OWNED (1)
                                                         BENEFICIALLY     -----------------------------------
NAME                                                         OWNED         BEFORE OFFERING    AFTER OFFERING
- -----------------------------------------------------  -----------------  -----------------  ----------------
<S>                                                    <C>                <C>                <C>
Tellabs, Inc. (2) ...................................        3,889,966            15.5%             13.1%
 4951 Indiana Avenue
 Lisle, IL 60532
Coral Partners II (3) ...............................        3,341,431            12.7%             10.9%
 60 South Sixth Street, Suite 3510
 Minneapolis, MN 55402
St. Paul Venture Capital, Inc. (4)...................        3,252,031            12.7%             10.8%
 8500 Normandale Lake Blvd., Suite 1940
 Bloomington, MN 55437
Vanguard IV, L.P. (5) ...............................        2,958,398            11.6%              9.8%
 525 University Avenue
 Palo Alto, CA 94301
Harris Corporation (6) ..............................        1,764,973             6.9%              5.9%
 DTS Division
 300 Bel Marin Keys Blvd.
 Novato, CA 94944-1188
B.J. Cassin (7)......................................        1,343,915             5.4%              4.6%
Donald Green (8).....................................        2,046,534             8.1%              6.8%
Carl J. Grivner (9)..................................          218,000               *                 *
Clifford H. Higgerson (10)...........................        2,958,398            11.6%              9.8%
Brian Jackman (11)...................................        3,910,932            15.6%             13.2%
Dan Rasdal (12)......................................           63,000               *                 *
Glenn Lillich (13)...................................          268,000             1.1%                *
Dan E. Steimle (14)..................................          255,407             1.0%                *
Carlos Baradello (15)................................           60,000               *                 *
All executive officers and directors as a group (10
 persons) (16).......................................       11,225,772            41.2%             35.4%
</TABLE>
 
- ---------
 *  Less than 1%.
 
 (1)  Beneficial ownership  is determined  in accordance  with the  rules of the
    Securities  and  Exchange  Commission  and  generally  includes  voting   or
    investment  power with respect to securities. Shares of Common Stock subject
    to options and warrants currently exercisable  within 60 days are deemed  to
    be  outstanding  for computing  the percentage  of  the person  holding such
    options or  warrants  but  are  not deemed  outstanding  for  computing  the
    percentage   of  any  other   person.  Except  as   indicated  by  footnote,
 
                                       53
<PAGE>
    and subject to community property  laws where applicable, the persons  named
    in  the table  have sole  voting and  investment power  with respect  to all
    shares of Common Stock shown as beneficially owned by them.
 
 (2) Includes 300,000 shares which may be acquired upon exercise of a warrant.
 
 (3) Includes 1,445,716 shares which may be acquired upon exercise of  warrants.
    Also  includes 2,193 shares held by Yuval Almog, 5,263 shares held in an IRA
    by Dain Bosworth, Inc.  as a custodian  for the benefit  of Yuval Almog  and
    2,000  shares which may be acquired upon exercise of a warrant by Mr. Almog.
    Also includes 2,193 shares held by Peter McNerney, 2,000 shares which may be
    acquired upon exercise of  a warrant by Mr.  McNerney, 1,228 shares held  by
    Linda  Watchmaker, and 800 shares  which may be acquired  upon exercise of a
    warrant by Ms. Watchmaker. Messrs. Almog and McNerney and Ms. Watchmaker are
    the general partners of Coral Management  Partners II, which is the  general
    partner  of Coral Partners II, and may be deemed to be the beneficial owners
    of such  shares.  Mr.  Almog,  Mr.  McNerney  and  Ms.  Watchmaker  disclaim
    beneficial ownership of such shares.
 
 (4)  St. Paul Venture  Capital, Inc. is  a wholly owned  subsidiary of St. Paul
    Fire and Marine Insurance Company, which is the record owner of the  shares.
    Includes 831,880 shares which may be acquired upon exercise of warrants.
 
 (5) Includes 779,464 shares which may be acquired upon exercise of warrants.
 
 (6) Includes 800,000 shares which may be acquired upon exercise of a warrant.
 
 (7)  Includes 256,433  shares held  by Mr. Cassin  as a  conservator for Robert
    Cassin, 43,380 of which shares may  be acquired upon exercise of a  warrant.
    The  remaining shares are held in trust by B.J. Cassin and Isabel B. Cassin,
    Trustees of the Cassin Family Trust U/D/T, dated January 31, 1996.
 
 (8) Includes  289,902 shares  issuable upon  exercise of  options held  by  Mr.
    Green,  67,408 of which  shares will be vested  as of 60  days from June 30,
    1996. Also includes 294,044 shares which  may be acquired by Mr. Green  upon
    exercise  of warrants, and 24,248 shares which may be acquired upon exercise
    of a warrant,  held in  an IRA by  Cowen &  Company as a  custodian for  the
    benefit of Mr. Green. Excludes shares held by Mr. Green's adult children.
 
 (9)  Includes  212,000 shares  issuable upon  exercise of  options held  by Mr.
    Grivner, 43,334 of which shares will be  vested as of 60 days from June  30,
    1996.  Also includes 6,000 shares  which may be acquired  upon exercise of a
    warrant.
 
   
(10) Includes  2,958,398 shares  held by  Vanguard IV,  L.P., 779,464  of  which
    shares may be acquired upon exercise of warrants. Mr. Higgerson is a general
    partner  of Vanguard Venture Partners, L.P., which is the general partner of
    Vanguard IV, L.P.  and may  be deemed  to be  the beneficial  owner of  such
    shares  owned  by  Vanguard  IV,  L.P.  Mr.  Higgerson  disclaims beneficial
    ownership of such shares.
    
 
(11) Includes 3,889,966 shares  held by Tellabs, Inc.,  300,000 of which  shares
    may  be acquired upon  exercise of a  warrant. Mr. Jackman  is the Executive
    Vice President of  Tellabs, Inc.  and the President  of Tellabs  Operations,
    Inc.  and may be deemed  to be the beneficial owner  of such shares owned by
    Tellabs. Mr. Jackman  disclaims beneficial  ownership of  such shares.  Also
    includes 10,000 shares which may be acquired by Mr. Jackman upon exercise of
    a warrant.
 
(12)  Includes  63,000 shares  issuable  upon exercise  of  options held  by Mr.
    Rasdal, 33,600 of which shares  will be vested as of  60 days from June  30,
    1996.
 
(13)  Includes  248,000 shares  issuable upon  exercise of  options held  by Mr.
    Lillich, 142,400 of which shares will be vested as of 60 days from June  30,
    1996.  Also includes 20,000 shares which may  be acquired upon exercise of a
    warrant.
 
(14) Includes 69,334  shares subject to  a right of  repurchase by the  Company.
    Includes  52,000  shares  issuable  upon exercise  of  options  held  by Mr.
    Steimle, 13,334 of which shares will be  vested as of 60 days from June  30,
    1996;  4,800 shares held in an IRA by  Alex. Brown & Sons as a custodian for
    the benefit of Mr. Steimle; and 4,000 shares held in an IRA by Alex. Brown &
    Sons as a custodian for the benefit of Jessica Steimle.
 
(15) Includes 18,000 shares which may be acquired upon exercise of a warrant.
 
(16) Includes 69,334  shares subject to  a right of  repurchase by the  Company.
    Includes  950,102 shares issuable upon exercise of options, 338,810 of which
    shares will be vested as of 60 days from June 30, 1996, and 1,495,136 shares
    which may be acquired upon exercise of warrants.
 
                                       54
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    Upon the completion of  this offering, the authorized  capital stock of  the
Company  will consist of 100,000,000 shares of Common Stock, par value $0.01 per
share, and 5,000,000 shares Preferred Stock, par value $0.01 per share.
 
COMMON STOCK
 
    As  of  June  30,  1996,  there  were  24,786,947  shares  of  Common  Stock
outstanding,  held  of  record by  138  stockholders. There  will  be 29,286,947
shares, of  Common Stock  outstanding after  giving effect  to the  sale of  the
shares  of Common Stock offered hereby, assuming no exercise after June 30, 1996
of outstanding  stock options  and warrants  (29,961,947 if  the  over-allotment
option granted to the Underwriters by the Company is exercised in full). Subject
to  the rights of the  holders of any Preferred  Stock which may be outstanding,
each holder of Common Stock on the applicable record date is entitled to receive
such dividends as may be declared by the Board of Directors out of funds legally
available therefor, and, in the event of  liquidation, to share pro rata in  any
distribution  of the Company's assets after payment or providing for the payment
of liabilities  and  the liquidation  preference  of any  outstanding  Preferred
Stock.  Each holder of Common Stock is entitled  to one vote for each share held
of record on the applicable  record date on all matters  presented to a vote  of
stockholders,  including the election of directors. Holders of Common Stock have
no preemptive rights to purchase or subscribe for any stock or other securities,
and there are no conversion rights or redemption or sinking fund provisions with
respect to such Common  Stock. All outstanding shares  of Common Stock are,  and
the  shares of Common Stock  offered hereby will be  when issued, fully paid and
non-assessable.
 
PREFERRED STOCK
 
    The Board of  Directors is  authorized, without  further vote  or action  by
holders  of Common Stock, to issue 5,000,000 shares of Preferred Stock in one or
more series and to designate the rights, preferences, limitations,  restrictions
of  and upon shares of each  series, including voting, redemption and conversion
rights.  The  Board  of  Directors  may  also  designate  dividend  rights   and
preferences  in  liquidation. It  is not  possible  to state  the effect  of the
authorization and issuance of any series  of Preferred Stock upon the rights  of
holders  of Common  Stock until the  Board of Directors  determines the specific
terms, rights and preferences of such a series of Preferred Stock. However, such
effects might include, among other  things, restricting dividends on the  Common
Stock,  diluting  the  voting  power  of  the  Common  Stock  or  impairing  the
liquidation rights of such  shares without further action  by holders of  Common
Stock. In addition, under certain circumstances, the issuance of Preferred Stock
may  render more difficult or tend to discourage a merger, tender offer or proxy
contest, the assumption of control by a holder of a large block of the Company's
securities or the removal of  incumbent management, which could thereby  depress
the market price of the Company's Common Stock.
 
WARRANTS
 
    As  of  June  30, 1996,  the  Company  had issued  warrants  to  purchase an
aggregate of  5,135,080 shares  of Common  Stock with  the following  per  share
exercise  prices:  541,048  at  $0.025; 209,344  at  $0.125;  600,000  at $0.25;
3,754,620 at $1.165; and  30,068 at $7.00. These  warrants contain net  exercise
provisions and expire at various dates between January 1, 1998 and September 30,
2000. See ``Certain Transactions."
 
ANTI-TAKEOVER PROVISIONS
 
    DELAWARE LAW
 
    Section  203  (``Section  203")  of  the  Delaware  General  Corporation Law
(``DGCL") is applicable to corporate takeovers of Delaware corporations. Subject
to certain exceptions set forth therein, Section 203 provides that a corporation
shall not engage in any business combination with any ``interested  stockholder"
for  a three-year  period following  the date  that such  stockholder becomes an
interested stockholder unless (a) prior to such date, the board of directors  of
the  corporation  approved either  the business  combination or  the transaction
which resulted in the stockholder  becoming an interested stockholder, (b)  upon
consummation  of the transaction  which resulted in  the stockholder becoming an
interested stockholder, the  interested stockholder  owned at least  85% of  the
voting  stock  of  the  corporation  outstanding  at  the  time  the transaction
 
                                       55
<PAGE>
commenced (excluding certain shares) or (c)  on or subsequent to such date,  the
business  combination is approved  by the board of  directors of the corporation
and by the affirmative  votes of at least  two-thirds of the outstanding  voting
stock  which is not owned by the  interested stockholder. Except as specified in
Section 203,  an interested  stockholder  is generally  defined to  include  any
person  that is the owner of 15% or  more of the outstanding voting stock of the
corporation, or is  an affiliate  or associate of  the corporation  and was  the
owner  of 15% or more of the outstanding  voting stock of the corporation, or is
an affiliate or associate of the corporation and was the owner of 15% or more of
the outstanding voting  stock of  the corporation  any time  within three  years
immediately  prior to  the relevant date,  and the affiliates  and associates of
such person. Under certain  circumstances, Section 203  makes it more  difficult
for  an interested  stockholder to effect  various business  combinations with a
corporation for a three-year period, although the stockholders may, by  adopting
an  amendment to the corporation's certificate of incorporation or bylaws, elect
not to be  governed by  this section, effective  12 months  after adoption.  The
Company's certificate of incorporation and the bylaws do not exclude the Company
from  the restrictions  imposed under  Section 203.  It is  anticipated that the
provisions of Section 203  may encourage companies  interested in acquiring  the
Company to negotiate in advance with the Board of Directors of the Company since
the  stockholder  approval requirement  would be  avoided if  a majority  of the
directors then  in  office  approve  either  the  business  combination  or  the
transaction   which  resulted   in  the   stockholder  becoming   an  interested
stockholder. These provisions may have the effect of deterring hostile takeovers
or delaying changes in  control of the Company,  which could depress the  market
price  of  the  Common  Stock  and  which  could  deprive  the  stockholders  of
opportunities to realize a premium on shares of the Common Stock held by them.
 
    CHARTER AND BYLAW PROVISIONS
 
    The Company's  certificate  of  incorporation  and  bylaws  contain  certain
provisions  that  could discourage  potential  takeover attempts  and  make more
difficult attempts  by stockholders  to change  management. The  certificate  of
incorporation  and the  bylaws provide for  a classified Board  of Directors and
permit the Board to create new directorships and to elect new directors to serve
for the full term  of the class  of director in which  the new directorship  was
created. The terms of the directors are staggered to provide for the election of
approximately  one- third  of the  Board members  each year,  with each director
serving a three-year term. The Board (or its remaining members, even though less
than a quorum) is also  empowered to fill vacancies  on the Board occurring  for
any  reason for the remainder of the term of the class of directors in which the
vacancy occurred. Stockholders may  remove a director or  the entire Board,  and
such  removal requires  the affirmative vote  of two- thirds  of the outstanding
voting  stock.  The  Company's   certificate  of  incorporation  provides   that
stockholders  may not take action by written consent but only at a stockholders'
meeting, and that special meetings of  the stockholders of the Company may  only
be called by the Chairman of the Board or a majority of the Board.
 
    The Company's certificate of incorporation provides that, in addition to the
requirements  of  the  DGCL,  any ``Business  Combination"  (as  defined  in the
certificate of incorporation) requires the affirmative vote of two-thirds of the
votes entitled  to be  cast by  the holders  of the  Company's then  outstanding
capital  stock, voting together  as a class, unless  two-thirds of the directors
(excluding certain directors affiliated with persons interested in the  Business
Combination) approve the proposed transaction.
 
    A  ``Business  Combination,"  as  defined in  the  Company's  certificate of
incorporation, includes (i) a merger or  consolidation of the Company or any  of
its   subsidiaries  with  an  ``Interested   Stockholder"  (as  defined  in  the
certificate of incorporation) or any other  corporation which is, or after  such
transaction would be, an ``Affiliate" or ``Associate" (as such terms are defined
in  the Securities Exchange Act of 1934)  of an Interested Stockholder; (ii) any
sale, lease, exchange,  mortgage, pledge,  transfer or other  disposition to  or
with,  or  proposed  by or  on  behalf  of, any  Interested  Stockholder  or any
Affiliate or Associate of any Interested Stockholder involving any assets of the
Company or any  subsidiary that  constitute five percent  or more  of the  total
assets  of the  Company; (iii) the  issuance or  transfer by the  Company or any
subsidiary of any securities of the Company or any subsidiary to, or proposed by
on behalf of,  an Interested  Stockholder or any  Affiliate or  Associate of  an
Interested  Stockholder in exchange for cash,  securities or other property that
constitute five percent or  more of the  total assets of  the Company; (iv)  the
adoption  of any  plan or  proposal for  the liquidation  or dissolution  of the
Company  or  any  spin-off   or  split-up  of  any   kind  of  the  Company   or
 
                                       56
<PAGE>
any  subsidiary, proposed by  or on behalf  of an Interested  Stockholder or any
Affiliate  or   Associate   of   an   Interested   Stockholder;   or   (v)   any
reclassification,  recapitalization, or  merger or consolidation  of the Company
with any  of its  subsidiaries or  any other  transaction that  has the  effect,
directly  or indirectly, of  increasing the proportionate share  of any class or
series of  capital stock  of the  Company or  any of  its subsidiaries  that  is
beneficially owned by any Interested Stockholder or an Affiliate or Associate of
any Interested Stockholder.
 
    The   Company's  certificate   of  incorporation   defines  an  ``Interested
Stockholder" as (i)  an individual,  corporation or other  entity (a  ``person")
which is or was at any time within the two-year period preceding the date of the
transaction  in question, the beneficial owner of 15% or more of the outstanding
voting securities of the Company; (ii) an Associate or Affiliate of the  Company
who within the two-year period preceding the date of the transaction in question
was  the beneficial owner of 15% or more of the outstanding voting securities of
the Company; or  (iii) under certain  circumstances, an assignee  of any of  the
foregoing persons. A person is a ``beneficial owner" of any stock of the Company
(a) which such person or any of its Affiliates and Associates beneficially owns,
directly  or  indirectly; (b)  which such  person  or any  of its  Affiliates or
Associates has, directly or indirectly, (i)  the right to acquire (whether  such
right  is  exercisable immediately  or  subject only  to  the passage  of time),
pursuant to any agreement, arrangement or understanding or upon the exercise  of
conversion rights, exchange warrants or options, or otherwise, or (ii) the right
to  vote pursuant to  any agreement, arrangement or  understanding; or (c) which
are beneficially owned, directly or indirectly,  by any other person with  which
such  person  or  any  of  its  Affiliates  or  Associates  has  any  agreement,
arrangement or understanding for  the purpose of  acquiring, holding, voting  or
disposing of any shares of capital stock.
 
    The  foregoing provisions of the certificate  of incorporation and bylaws of
the Company may deter any potential unfriendly offers or other efforts to obtain
control of the Company that are not approved by the Board of Directors and could
thereby deprive the stockholders of opportunities to realize a premium on  their
Common  Stock and could  make removal of incumbent  directors more difficult. At
the same time,  these provisions  may have the  effect of  inducing any  persons
seeking  control of the  Company or a  business combination with  the Company to
negotiate terms acceptable  to the Board  of Directors. Such  provisions of  the
Company's certificate of incorporation and bylaws can be changed or amended only
by  the affirmative vote of the holders  of at least two-thirds of the Company's
then outstanding voting stock.
 
REGISTRATION RIGHTS
 
    Following this offering, the holders  of approximately 20,679,023 shares  of
Common  Stock and warrants to purchase  approximately 5,135,080 shares of Common
Stock or their assignees  (the ``Holders"), will be  entitled to certain  rights
with  respect to the registration of such shares under the Securities Act. Under
the terms of an agreement  between the Company and  the Holders, if the  Company
proposes to register any of its securities under the Securities Act, the Holders
are  entitled to notice of such registration  and are entitled to include shares
of such  Common  Stock  therein;  provided, among  other  conditions,  that  the
underwriters  of any offering have the right  to limit the number of such shares
included in such registration. In addition,  upon the request of the Holders  of
at  least 50% of the  registrable securities at any  time after January 1, 1997,
the Holders may  require the Company  on not more  than one occasion  to file  a
registration statement under the Securities Act with respect to such shares, and
the  Company is required  to use its  best efforts to  effect such registration,
subject to  certain conditions  and  limitations. The  Holders may  require  the
Company to register all or a portion of their shares with registration rights on
Form S-3 when such form becomes available to the Company, on not more than three
occasions,  subject to  certain conditions and  limitations. If  the Holders, by
exercising their demand registration rights, cause a large number of  securities
to be registered and sold in the public market, such sales could have an adverse
effect  on the  market price  for the Company's  Common Stock.  Moreover, if the
Company were to include in a  Company initiated registration shares held by  the
Holders  pursuant to exercise of their piggyback registration rights, such sales
may have an adverse effect on the Company's ability to raise additional capital.
 
TRANSFER AGENT AND REGISTRAR
 
    The Company has appointed The First National Bank of Boston as its  transfer
agent and registrar of the Common Stock.
 
                                       57
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE
 
    Prior to this offering, there has been no market for the Common Stock of the
Company.  Future  sales of  substantial amounts  of Common  Stock in  the public
market could adversely  affect market prices  prevailing from time  to time.  As
described  below, no  shares currently  outstanding will  be available  for sale
immediately after  this  offering due  to  certain contractual  restrictions  on
resale.  Sales of  substantial amounts  of Common  Stock of  the Company  in the
public market after the  lapse of such restrictions  could adversely affect  the
prevailing  market price and the ability of  the Company to raise equity capital
in the future.
 
   
    Upon  completion  of  this  offering,  the  Company  will  have  outstanding
29,286,947  shares of Common Stock, assuming no  exercise after June 30, 1996 of
outstanding options or warrants. Of these  shares, the 4,500,000 shares sold  in
this  offering will be freely tradeable without restriction under the Securities
Act, unless purchased by ``affiliates" of the Company as that term is defined in
Rule 144 under the Securities  Act, which shares will  be subject to the  resale
limitations  of  Rule 144  adopted under  the Securities  Act ("Rule  144"). The
remaining 24,786,947 shares of Common Stock existing are ``restricted shares" as
defined in Rule 144.  Such restricted shares  may be sold  in the public  market
only  if registered or if they qualify  for an exemption from registration under
Rules 144,  145  or 701  of  the Securities  Act.  As a  result  of  contractual
restrictions  described  below and  the provisions  of Rules  144, 145  and 701,
additional shares will be  available for sale in  the public market as  follows:
(i) other than 4,500,000 shares sold in this offering, no share will be eligible
for  immediate sale on the date of  this Prospectus, (ii) 19,403,743 shares will
be eligible for sale upon expiration of lock-up agreements (as described  below)
180  days  after  the date  of  this  Prospectus, subject  in  certain  cases to
applicable Rule 144 volume limitations, and (iii) the remaining 5,383,204 shares
will be  eligible  for  sale  thereafter upon  expiration  of  their  respective
two-year  holding period. As of June 30, 1996 there were outstanding warrants to
purchase 5,135,080 shares of Common  Stock. These warrants contain net  exercise
provisions.  Accordingly, any shares  issued upon net  exercise will be eligible
for sale immediately upon expiration of lock-up agreements pursuant to Rule 144.
    
 
    Each officer  and  director of  the  Company and  certain  stockholders  and
warrantholders  of the Company have agreed  not to offer, pledge, sell, contract
to sell,  sell  any option  or  contract to  purchase,  purchase any  option  or
contract  to sell, grant any option, right  or warrant to purchase, or otherwise
transfer or dispose of,  directly or indirectly, any  shares of Common Stock  or
any securities convertible into or exercisable or exchangeable for Common Stock,
or enter into any swap or similar agreement that transfers, in whole or in part,
the  economic risk of  ownership of the Common  Stock, for a  period of 180 days
after the date of this Prospectus,  without the prior written consent of  Morgan
Stanley  &  Co. Incorporated.  Morgan Stanley  & Co.  Incorporated, in  its sole
discretion at any time and  without notice, may release  any or all shares  from
these  lock-up agreements and permit holders of  the shares to resell all or any
portion of their  shares at  any time  prior to  the expiration  of the  180-day
lock-up period.
 
    In  addition, certain stockholders  of the Company  and all optionholders of
the Company have agreed  not to sell,  make any short sale  of, loan, grant  any
option  for the purchase of, or otherwise  dispose of any shares of Common Stock
for a period of 180 days after the offering without the prior written consent of
the Company. The Company has agreed not to release any of the shares subject  to
such  lock-up agreements without  the prior written consent  of Morgan Stanley &
Co. Incorporated.
 
    In general, under Rule 144 as  currently in effect, beginning 90 days  after
the  date of this Prospectus, a person  (or persons whose shares are aggregated)
who has beneficially owned Restricted Shares  for at least two years  (including
the  holding period of any prior owner except an affiliate) would be entitled to
sell within any three-month period a number  of shares that does not exceed  the
greater  of:  (i) one  percent  of the  number of  shares  of Common  Stock then
outstanding (which  will equal  approximately 282,869  shares immediately  after
this  offering); of (ii) the  average weekly trading volume  of the Common stock
during the four calendar weeks preceding the  filing of a Form 144 with  respect
to  such sale. Sales under  Rule 144 are also subject  to certain manner of sale
provisions and notice  requirements and  to the availability  of current  public
information  about the Company. Under Rule 144(k), a person who is not deemed to
have been an affiliate of the Company at any time during the 90 days preceding a
sale, and who has beneficially owned the
 
                                       58
<PAGE>
shares proposed  to be  sold for  at least  three years  (including the  holding
period  of any prior owner except an affiliate), is entitled to sell such shares
without complying with the manner of sale, public information, volume limitation
or notice provisions of Rule 144.
 
    Subject to  certain  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 the Company by its 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 Securities  and
Exchange  Commission has  indicated that  Rule 701  will apply  to stock options
granted by the Company 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 its  two-year
minimum holding period requirements.
 
   
    Shortly  after this  offering, the  Company intends  to file  a registration
statement under the  Securities Act  covering 8,675,676 shares  of Common  Stock
reserved  for issuance under the Company's Employee Stock Purchase Plan and 1996
Stock Incentive  Plan. Such  registration  statement will  automatically  become
effective  upon  filing. Accordingly,  any vested  shares registered  under such
registration statement will, subject to  Rule 144 volume limitations  applicable
to  affiliates  of  the  Company,  be available  for  sale  in  the  open market
immediately upon effectiveness  of such registration  statement, subject to  the
following  contractual restrictions. Of such shares, 4,076,918 shares subject to
stock options outstanding  under the 1996  Stock Incentive Plan  are subject  to
lock-up agreements and will be eligible for sale upon expiration of such lock-up
agreements  180 days after the date of this Prospectus. In addition, the Company
has agreed to restrict the transfer  of the remaining 3,098,758 shares that  are
issued  pursuant to exercise  of options granted under  the 1996 Stock Incentive
Plan for a period of 180 days  after the date of this Prospectus. The  remaining
1,500,000  shares subject to options under the Employee Stock Purchase Plan will
be eligible  for  sale  upon  exercise  and  upon  filing  of  the  registration
statement.
    
 
    In  addition, after this  offering, the holders  of approximately 20,679,023
shares of Common Stock and  warrants to purchase approximately 5,135,080  shares
of  Common Stock will be entitled to certain rights with respect to registration
of such shares under the Securities  Act. Registration of such shares under  the
Securities  Act would  result in such  shares becoming  freely tradeable without
restriction under the Securities Act (except for shares purchased by  affiliates
of  the Company)  immediately upon the  effectiveness of  such registration. See
``Description of Capital Stock -- Registration Rights."
 
                                       59
<PAGE>
                                  UNDERWRITERS
 
    Under the  terms and  subject  to conditions  contained in  an  Underwriting
Agreement,  the U.S.  Underwriters named  below, for  whom Morgan  Stanley & Co.
Incorporated, Merrill  Lynch,  Pierce,  Fenner &  Smith  Incorporated,  Cowen  &
Company and Hambrecht & Quist LLC are acting as U.S. Representatives (the ``U.S.
Underwriters"), have severally agreed to purchase, and the Company has agreed to
sell  to them, and  the International Underwriters named  below, for whom Morgan
Stanley &  Co.  International  Limited, Merrill  Lynch  International,  Cowen  &
Company  and Hambrecht &  Quist LLC are  acting as International Representatives
(the ``International Underwriters"), have severally agreed to purchase, and  the
Company  has agreed to sell  to them, the respective  number of shares of Common
Stock set forth opposite their respective names below:
 
   
<TABLE>
<CAPTION>
                                                                                             NUMBER OF
                                           NAME                                              OF SHARES
- -------------------------------------------------------------------------------------------  ----------
<S>                                                                                          <C>
U.S. Underwriters:
  Morgan Stanley & Co. Incorporated........................................................     712,500
  Merrill Lynch, Pierce, Fenner & Smith
            Incorporated...................................................................     712,500
  Cowen & Company..........................................................................     712,500
  Hambrecht & Quist LLC....................................................................     712,500
  Alex. Brown & Sons Incorporated..........................................................     100,000
  The Chicago Corporation..................................................................      50,000
  Dain Bosworth Incorporated...............................................................      50,000
  Donaldson, Lufkin & Jenrette Securities Corporation......................................     100,000
  EVEREN Securities, Inc...................................................................      50,000
  Fahnestock & Co. Inc.....................................................................      50,000
  Furman Selz LLC..........................................................................      50,000
  McDonald & Company Securities, Inc.......................................................      50,000
  Needham & Company, Inc...................................................................      50,000
  Nutmeg Securities, Ltd...................................................................      50,000
  Parker/Hunter Incorporated...............................................................      50,000
  Brad Peery Inc...........................................................................      50,000
  Pennsylvania Merchant Group Ltd..........................................................      50,000
  Raymond James & Associates, Inc..........................................................      50,000
  Smith Barney Inc.........................................................................     100,000
  Soundview Financial Group, Inc...........................................................      50,000
                                                                                             ----------
        Subtotal...........................................................................   3,800,000
                                                                                             ----------
International Underwriters:
  Morgan Stanley & Co. International Limited...............................................     175,000
  Merrill Lynch International..............................................................     175,000
  Cowen & Company..........................................................................     175,000
  Hambrecht & Quist LLC....................................................................     175,000
                                                                                             ----------
        Subtotal...........................................................................     700,000
                                                                                             ----------
            Total..........................................................................   4,500,000
                                                                                             ----------
                                                                                             ----------
</TABLE>
    
 
    The U.S. Underwriters  and the International  Underwriters are  collectively
referred to as the ``Underwriters." The Underwriting Agreement provides that the
obligations  of the several Underwriters  to pay for and  accept delivery of the
shares of Common  Stock offered hereby  are subject to  the approval of  certain
legal matters by their counsel and to certain other conditions. The Underwriters
are  obligated to  take and pay  for all of  the shares of  Common Stock offered
hereby (other than those covered by the over-allotment option described  below),
if any are taken.
 
                                       60
<PAGE>
    Pursuant  to the Agreement Between U.S. and International Underwriters, each
U.S. Underwriter has represented  and agreed that,  with certain exceptions  set
forth  below, (a) it is not purchasing any of the U.S. Shares (as defined below)
for the account  of anyone other  than a  United States or  Canadian Person  (as
defined  below) and (b) it has not offered  or sold, and will not offer or sell,
directly or indirectly,  any of the  U.S. Shares or  distribute this  Prospectus
outside  the United States or Canada or to  anyone other than a United States or
Canadian Person.  Pursuant  to  the Agreement  Between  U.S.  and  International
Underwriters,  each International  Underwriter has represented  and agreed that,
with certain exceptions set  forth below, (a)  it is not  purchasing any of  the
International  Shares (as defined below) for the account of any United States or
Canadian Person and (b) it has not offered or sold, and will not offer or  sell,
directly  or  indirectly, any  of the  International  Shares or  distribute this
Prospectus in the United States  or Canada or to  any United States or  Canadian
Person.  The foregoing limitations do not apply to stabilization transactions or
to certain  other  transactions specified  in  the Agreement  Between  U.S.  and
International  Underwriters. As used herein, ``United States or Canadian Person"
means  any  national  or  resident  of  the  United  States  or  Canada  or  any
corporation,  pension, profit-sharing or  other trust or  other entity organized
under the laws of the  United States or Canada  or of any political  subdivision
thereof  (other than a branch located outside of the United States and Canada of
any United States or Canadian Person) and includes any United States or Canadian
branch of a person who is not otherwise a United States or Canadian Person,  and
``United  States"  means  the United  States  of America,  its  territories, its
possessions and all  areas subject  to its  jurisdiction. All  shares of  Common
Stock  to be  offered by  the U.S.  Underwriters and  International Underwriters
under the Underwriting Agreement  are referred to herein  as the ``U.S.  Shares"
and the ``International Shares," respectively.
 
    Pursuant to the Agreement Between U.S. and International Underwriters, sales
may  be made between the U.S. Underwriters and the International Underwriters of
any  number  of  shares  of  Common  Stock  to  be  purchased  pursuant  to  the
Underwriting  Agreement  as may  be  mutually agreed.  The  per share  price and
currency settlement of any shares  of Common Stock so  sold shall be the  public
offering  price set forth  on the cover  page hereof, in  United States dollars,
less an  amount not  greater than  the per  share amount  of the  concession  to
dealers set forth below.
 
    Pursuant  to the Agreement Between U.S. and International Underwriters, each
U.S. Underwriter has represented that it has not offered or sold, and has agreed
not to offer or  sell, any shares  of Common Stock,  directly or indirectly,  in
Canada  in contravention  of the  securities laws of  Canada or  any province or
territory thereof and has  represented that any offer  of such shares in  Canada
will  be  made only  pursuant to  an exemption  from the  requirement to  file a
prospectus in the province or territory of  Canada in which such offer is  made.
Each  U.S. Underwriter has  further agreed to  send to any  dealer who purchases
from it  any shares  of Common  Stock a  notice stating  in substance  that,  by
purchasing  such  shares, such  dealer  represents and  agrees  that it  has not
offered or sold and will not offer or sell, directly or indirectly, any of  such
shares  in  Canada in  contravention of  the  securities laws  of Canada  or any
province or territory thereof and  that any offer of  shares of Common Stock  in
Canada will be made only pursuant to an exemption from the requirement to file a
prospectus  in the province or territory of  Canada in which such offer is made,
and that such dealer will  deliver to any other dealer  to whom it sells any  of
such shares a notice to the foregoing effect.
 
    Pursuant  to the Agreement Between U.S. and International Underwriters, each
International Underwriter has represented  that (i) it has  not offered or  sold
and prior to the expiration of the period of six months from the date of closing
will  not offer  or sell  any shares of  Common Stock  to persons  in the United
Kingdom except to persons whose  ordinary activities involve them in  acquiring,
holding,  managing or disposing  of investments (as principal  or agent) for the
purposes of  their  businesses or  otherwise  in circumstances  which  have  not
resulted  and will not  result in an offer  to the public  in the United Kingdom
within the meaning  of the  Public Offers  of Securities  Regulations 1995  (the
``Regulations");  (ii)  it  has complied  and  will comply  with  all applicable
provisions of the Financial Services Act  1986 with respect to anything done  by
it  in  relation to  such  shares in,  from  or otherwise  involving  the United
Kingdom; and (iii) it has only issued or  passed on and will only issue or  pass
on to any person in the United Kingdom any
 
                                       61
<PAGE>
document  received by it in connection with the issue of such shares to a person
who is of a kind described in  Article 11(3) of the Financial Services Act  1986
(Investment Advertisements) (Exemptions) Order 1996, or is a person to whom such
document may otherwise lawfully be issued or passed on.
 
    Pursuant  to the Agreement Between U.S. and International Underwriters, each
International Underwriter has represented and agreed that it has not offered  or
sold,  and will not offer or sell, directly or indirectly, in Japan or to or for
the account of  any resident  thereof, any shares  of Common  Stock acquired  in
connection   with  this  offering,  except  for  offers  or  sales  to  Japanese
International Underwriters or dealers and except pursuant to any exemption  from
the  registration requirements of the Securities and Exchange Law of Japan. Each
International Underwriter has further agreed to send to any dealer who purchases
from it any of such  shares of Common Stock a  notice stating in substance  that
such dealer may not offer or sell any of such shares, directly or indirectly, in
Japan  or to or for the account of  any resident thereof, except pursuant to any
exemption from the registration requirements of the Securities and Exchange  Law
of  Japan, and that such dealer  will send to any other  dealer to whom it sells
any of such shares a notice to the foregoing effect.
 
   
    The Underwriters initially  propose to offer  part of the  shares of  Common
Stock  directly to the public at the  initial public offering price set forth on
the cover page hereof and part to certain dealers at a price which represents  a
concession  not in  excess of  $1.05 a share  under the  initial public offering
price. Any Underwriter may allow, and such dealers may reallow, a concession not
in excess of $0.10 a share to other Underwriters or to certain other dealers.
    
 
   
    The Company has granted to the U.S. Underwriters an option, exercisable  for
30  days from the date of this  Prospectus, to purchase up to 675,000 additional
shares of Common Stock  at the initial  public offering price  set forth on  the
cover  page  hereof,  less  underwriting  discounts  and  commissions.  The U.S.
Underwriters may exercise  such option  to purchase  solely for  the purpose  of
covering  over-allotments, if any, incurred in the  sale of the shares of Common
Stock offered hereby.
    
 
    The Representatives of the Underwriters  have informed the Company that  the
Underwriters  do  not  intend sales  to  discretionary accounts  to  exceed five
percent of the total number of shares of Common Stock offered hereby.
 
    The Company and the Underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act.
 
    The Company has agreed  not to offer, pledge,  sell, contract to sell,  sell
any  option or contract  to purchase, purchase  any option or  contract to sell,
grant any option, right or warrant to purchase, or otherwise transfer or dispose
of, directly  or  indirectly, any  shares  of  Common Stock  or  any  securities
convertible  into or exercisable or exchangeable for Common Stock, or enter into
any swap or similar agreement that transfers, in whole or in part, the  economic
risk  of ownership of the Common Stock, for  a period of 180 days after the date
of this Prospectus, without  the prior written consent  of Morgan Stanley &  Co.
Incorporated, subject to certain limited exceptions.
 
    See  ``Shares  Eligible  for  Future  Sale"  for  a  description  of certain
arrangements by which all  officers, directors and  stockholders of the  Company
have  agreed not to sell or otherwise dispose of the Common Stock of the Company
for a period of 180  days after the date of  this Prospectus, without the  prior
written consent of Morgan Stanley & Co. Incorporated.
 
   
    The  Underwriters have  reserved for  sale, at  the initial  public offering
price, up  to 260,000  shares of  the Common  Stock offered  hereby for  certain
individuals  who have expressed an interest  in purchasing such shares of Common
Stock in the offering. The  number of shares available  for sale to the  general
public will be reduced to the extent such persons purchase such reserved shares.
Any  reserved shares not so purchased will be offered by the Underwriters to the
general public on the same basis as other shares offered hereby.
    
 
PRICING OF THE OFFERING
 
   
    Prior to this offering,  there has been no  public market for the  Company's
Common  Stock. The initial public offering  price was determined by negotiations
among the Company and the Representatives of the
    
 
                                       62
<PAGE>
   
Underwriters. Among the  factors considered  in determining  the initial  public
offering  price were  the future  prospects of the  Company and  its industry in
general; sales, earnings and certain  other financial and operating  information
of  the Company  in recent periods;  and the  price-earnings ratios, price-sales
ratios,  market  prices  of  securities  and  certain  financial  and  operating
information of companies engaged in activities similar to those of the Company.
    
 
                                 LEGAL MATTERS
 
    The  validity of the Common Stock offered hereby will be passed upon for the
Company by Brobeck, Phleger &  Harrison LLP, San Francisco, California.  Certain
legal  matters in  connection with  this offering  will be  passed upon  for the
Underwriters by Wilson,  Sonsini, Goodrich &  Rosati, Professional  Corporation,
Palo Alto, California.
 
                                    EXPERTS
 
    The consolidated financial statements of the Company as of December 31, 1994
and  1995, and for each of the years in the three-year period ended December 31,
1995, have been included herein and in the Registration Statement in reliance on
the report of KPMG Peat  Marwick LLP, independent auditors, appearing  elsewhere
herein  and  upon  the  authority  of  said  firm  as  experts  in  auditing and
accounting.
 
    The financial statements of Advanced Access Labs as of December 30, 1994 and
December 29, 1995 and for the period April 11, 1994 (inception) through December
30, 1994 and for the year ended December 29, 1995, have been included herein and
in the Registration Statement in reliance  on the report of Grant Thornton  LLP,
independent  certified public  accountants, appearing elsewhere  herein and upon
the authority of said firm as experts in accounting and auditing.
 
                             ADDITIONAL INFORMATION
 
    The Company  has filed  with  the Securities  and Exchange  Commission  (the
``Commission")   a  registration  statement  on  Form  S-1  (together  with  all
amendments and  exhibits  thereto,  the  ``Registration  Statement")  under  the
Securities Act with respect to the Common Stock offered hereby. This Prospectus,
which  constitutes a part of the Registration Statement, does not contain all of
the information set forth in the Registration Statement, certain parts of  which
are  omitted in accordance with the Rules and Regulations of the Commission. For
further information with  respect to the  Company and the  Common Stock  offered
hereby,  reference is made to the Registration Statement and to the exhibits and
schedules filed therewith.  Statements contained  in this Prospectus  as to  the
contents  of any contract or other document are not necessarily complete, and in
each instance reference is made to the  copy of such contract or other  document
filed  as an  exhibit to the  Registration Statement, each  such statement being
qualified in  all  respects  by  such  reference.  Copies  of  the  Registration
Statement  and the exhibits and schedules thereto  may be inspected or copied at
the public  reference facilities  maintained  by the  Commission at  Room  1024,
Judiciary  Plaza, 450  Fifth Street,  N.W., Washington,  D.C. 20549,  and at the
Commission's regional offices  located at Northwestern  Atrium Center, 500  West
Madison  Street, Suite  1400, Chicago, Illinois  60661 and at  Seven World Trade
Center, 13th  Floor,  New York,  New  York  10048. Copies  of  the  Registration
Statement  may  also  be  obtained  from the  Public  Reference  Section  of the
Commission at  450 Fifth  Street,  N.W., Washington,  D.C. 20549  at  prescribed
rates.  The  Commission  also maintains  a  World  Wide Web  site  that contains
reports, proxy  and  information  statements  and  other  information  regarding
registrants,  such as the Company, that file electronically with the Commission.
The address of the site is http://www.sec.gov.
 
                                       63
<PAGE>
                               GLOSSARY OF TERMS
 
<TABLE>
<S>                                            <C>
Analog.......................................  A form of transmission employing a continuous
                                               electrical signal (rather than a pulsed or
                                               digital system) that varies in frequency and
                                               amplitude.
Application Specific Integrated Circuit        A broad term that refers to custom or semi-
 (ASIC)......................................  custom integrated circuits.
Asynchronous Data Channel Service (ADU)......  A low speed asynchronous data interface for
                                               rates up to 38.4 Kbps.
Backplane Design.............................  The design of the circuit board that
                                               interconnects a wide variety of service
                                               types. The interconnection of the traces on
                                               the backplane defines the performance and
                                               flexibility of the system.
Bandwidth....................................  A relative range of frequencies that carry a
                                               signal without distortion on a transmission
                                               medium.
Bellcore.....................................  Bell Communications Research. A standards
                                               body funded by the telecommunications
                                               industry that proposes new network
                                               architectures and performs validation testing
                                               and analysis.
Beta Testing.................................  A step in the engineering cycle prior to full
                                               manufacturing release.
Central Office...............................  A term commonly used to describe the location
                                               of the switching equipment that is used to
                                               re-direct telephone calls.
Central Office Switch........................  Used synonomously with Central Office.
Central Processing Unit (CPU)................  The circuit pack that contains the main
                                               operating software for the system. It is
                                               responsible for co-ordination of all system
                                               level functionality.
Channel Bank.................................  A multiplexer that puts many slow speed voice
                                               or data conversations onto one high speed
                                               link and controls the flow of the
                                               conversations.
Coaxial......................................  A type of electrical cable in which one
                                               conductor is wrapped around another and
                                               insulates the inner conductor.
Codec........................................  Electronic circuitry employed to digitize
                                               analog signals and to convert the digital
                                               signals back into analog form.
Digital......................................  The representation of information as discrete
                                               value (i.e., 1s and 0s). These digital values
                                               can be processed, manipulated, exchanged or
                                               stored by electronic systems.
Digital Loop Carrier (DLC)...................  A device used to concentrate susbscriber
                                               telephone circuits onto one or more high
                                               speed digital loops in a carrier's central
                                               office by converting analog signals into
                                               digital bit streams.
</TABLE>
 
                                       64
<PAGE>
<TABLE>
<S>                                            <C>
E1 Transceivers..............................  A transmitter and receiver (transceiver) for
                                               sending digital data at 2.04 Mbps over
                                               twisted pair cabling.
Frequency....................................  The number of identical cycles per second,
                                               measured in hertz, of a periodic oscillation
                                               or wave in radio propagation.
Hertz........................................  One cycle per second. The unit for measuring
                                               frequency signals.
High Speed Digital Subscriber Line (HDSL)....  A technology that enables high speed
                                               transmission of data over copper wires.
                                               Utilization of this technology requires
                                               minimal changes to existing copper phone
                                               lines.
Integrated Services Digital Network (ISDN)...  An internationally accepted standard for
                                               voice, data and signaling that makes all
                                               transmission circuits end-to-end digital and
                                               defines a standard out-of-band signaling
                                               system.
ISO-9001.....................................  ISO is the International Standards
                                               Organisation responsible for drafting quality
                                               procedures. 9001 is the quality procedure for
                                               manufacturing.
Large Line-Size Market.......................  Market with 600 to 2,000 lines within the
                                               serviceable area of the NGDLC, generally in
                                               urban areas.
Line Cards...................................  A term commonly used to refer to service
                                               interfaces that terminate on plug-in circuit
                                               packs.
Local Exchange Terminal (LET)................  The term the Company uses to describe the
                                               terminal that is housed in the Central
                                               Office. Exchange is the international word
                                               for switch.
Local Loop...................................  A term used to describe the copper cables
                                               that connect a customer's phone to the
                                               Central Office.
MLT Remote Testing Capabilities..............  MLT or mechanized loop testing is a technique
                                               the telephone companies use to test a
                                               customer's telephone line. When a DLC is
                                               used, special interfaces must be developed to
                                               provide this test interface.
Next Generation Digital Loop Carrier           The next generation of DLC's, designed and
 (NGDLC).....................................  introduced in the market in the early 1990s
                                               to support telecommunications services over
                                               fiber-only networks in densely populated
                                               urban markets with 600 to 2,000 lines within
                                               the serviceable area of the NGDLC.
PCBA.........................................  Printed Circuit Board Assembly.
Plain Old Telephone Service (POTS)...........  Basic telephone service with no enhanced
                                               features such as call waiting, conference
                                               calling or call forwarding.
Printed Circuit Boards.......................  A fiberglass laminated board with etched
                                               copper traces.
RBOC.........................................  Regional Bell Operating Company.
</TABLE>
 
                                       65
<PAGE>
<TABLE>
<S>                                            <C>
Remote Service Terminal (RST)................  A term the Company uses to describe its
                                               outside enclosures located at or near the
                                               customers that are being served from it.
Small Line-Size Market.......................  Market with less than 600 lines within the
                                               serviceable area of the DLC, generally in
                                               rural and suburban areas.
Synchronous Data Channel Service (SDU).......  A low speed data interface for rates less
                                               than 64 Kbps.
Synchronous Optical Network (SONET)..........  A standard designed to establish a digital
                                               hierarchical network that enables the
                                               transmission of data over a consistent
                                               transport scheme at speeds up to 2.4 Gbps.
SONET OC3 Transceivers.......................  An optical bi-directional circuit pack
                                               operating at the SONET OC3 rate (155.52 Mbps)
                                               that meets the SONET requirements for
                                               inter-operability.
T1 Transceivers..............................  A transmitter and receiver (transceiver) for
                                               sending digital data at 1.544 Mbps over
                                               twisted pair cabling.
Universal Voice Grade Service (UVG)..........  A multipurpose circuit pack that fulfills a
                                               variety of interface requirements for modems,
                                               etc.
</TABLE>
 
                                       66
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
                      ADVANCED FIBRE COMMUNICATIONS, INC.
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
 
<S>                                                                                                          <C>
Independent Auditors' Report...............................................................................        F-2
 
Consolidated Balance Sheets as of December 31, 1994 and 1995, and June 30, 1996............................        F-3
 
Consolidated Statements of Operations for the years ended December 31, 1993, 1994 and 1995, and for the six
 months ended June 30, 1995 and 1996.......................................................................        F-4
 
Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit for the years
 ended December 31, 1993, 1994 and 1995, and for the six months ended June 30, 1996........................        F-5
 
Consolidated Statements of Cash Flow for the years ended December 31, 1993, 1994 and 1995, and for the six
 months ended June 30, 1995 and 1996.......................................................................        F-6
 
Notes to Consolidated Financial Statements.................................................................        F-7
</TABLE>
 
                              ADVANCED ACCESS LABS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
 
<S>                                                                                                          <C>
Report of Independent Certified Public Accountants.........................................................  F-17
 
Balance Sheets as of December 30, 1994 and December 29, 1995...............................................  F-18
 
Statements of Operations for the periods ended December 30, 1994 and December 29, 1995.....................  F-19
 
Statement of Partners' Equity (Deficit) for the period from April 11, 1994 (inception) through December 30,
 1994 and the year ended December 29, 1995.................................................................  F-20
 
Statement of Cash Flows for the periods ended December 30, 1994 and December 29, 1995......................  F-21
 
Notes to Financial Statements..............................................................................  F-22
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
The Board of Directors
Advanced Fibre Communications, Inc.:
 
    We  have audited  the accompanying  consolidated balance  sheets of Advanced
Fibre Communications, Inc. and subsidiaries  (the "Company") as of December  31,
1994 and 1995, and the related consolidated statements of operations, redeemable
convertible preferred stock and stockholders' deficit and cash flows for each of
the  years in  the three-year  period ended  December 31,  1995. These financial
statements  are   the   responsibility   of  the   Company's   management.   Our
responsibility  is to express an opinion  on these financial statements based on
our audits.
 
    We conducted  our  audits in  accordance  with generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts and disclosures in the financial statements. An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our  opinion, the  consolidated financial  statements referred  to  above
present  fairly, in all material respects, the financial position of the Company
as of December 31, 1994 and 1995, and the results of its operations and its cash
flows for each of the years in the three-year period ended December 31, 1995, in
conformity with generally accepted accounting principles.
 
                                          KPMG Peat Marwick LLP
 
San Francisco, California
March 22, 1996, except for
 Notes 7, 8 and 9, which
 are as of August 15, 1996
 
                                      F-2
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                          CONSOLIDATED BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                  JUNE 30, 1996
                                                                            DECEMBER 31,      ----------------------
                                                                        --------------------                 PRO
                                                                          1994       1995      ACTUAL       FORMA
                                                                        ---------  ---------  ---------  -----------
                                                                                                   (UNAUDITED)
<S>                                                                     <C>        <C>        <C>        <C>
                                                                                                          (NOTE 1)
Current assets:
  Cash and cash equivalents, including restricted cash of $319,
   $1,730, and $150 in 1994, 1995, and 1996, respectively.............  $   3,858  $  11,118  $  10,885   $  10,885
  Accounts receivable.................................................      5,192     10,993     20,996      20,996
  Inventories.........................................................      4,620     10,149     19,328      19,328
  Deferred income taxes...............................................     --         --          7,953       7,953
  Prepaid expenses....................................................        120        132        212         212
                                                                        ---------  ---------  ---------  -----------
    Total current assets..............................................     13,790     32,392     59,374      59,374
Property and equipment, net...........................................      1,042      1,828      3,610       3,610
Other assets..........................................................         52      2,460      4,315       4,315
                                                                        ---------  ---------  ---------  -----------
      Total assets....................................................  $  14,884  $  36,680  $  67,299   $  67,299
                                                                        ---------  ---------  ---------  -----------
                                                                        ---------  ---------  ---------  -----------
 
                              LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND
                                           STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Bank borrowings.....................................................  $  --      $  --      $   9,700   $  16,806
  Accounts payable....................................................      2,605      7,121     11,346      11,346
  Accrued liabilities.................................................      4,376      6,501     14,608       7,502
                                                                        ---------  ---------  ---------  -----------
    Total current liabilities.........................................      6,981     13,622     35,654      35,654
Long-term liabilities.................................................         63      1,046        569         569
Redeemable convertible preferred stock, $0.01 par value; actual --
 16,832,908, 35,345,816, and 35,565,816 shares authorized in 1994,
 1995, and 1996, respectively; 15,432,908, 17,011,204, and 17,231,204
 shares issued and outstanding in 1994, 1995, and 1996, respectively;
 pro forma -- no shares authorized, issued, or outstanding............     23,546     37,777     39,317      --
Commitments and contingencies.........................................
Stockholders' equity (deficit):
  Preferred stock, $0.01 par value; pro forma -- 5,000,000 shares
   authorized; no shares issued and outstanding.......................     --         --         --          --
  Common stock, $0.01 par value; actual -- 60,000,000, 84,654,184, and
   84,654,184 shares authorized in 1994, 1995, and 1996, respectively;
   3,092,724, 5,015,168, and 6,069,484 shares issued and outstanding
   in 1994, 1995, and 1996, respectively; pro forma -- 100,000,000
   shares authorized; 24,786,947 shares issued and outstanding........         31         50         61         248
  Additional paid-in capital..........................................         (5)    (2,248)     6,806      45,936
  Notes receivable from stockholders..................................     --           (176)      (176)       (176)
  Accumulated deficit.................................................    (15,732)   (13,391)   (14,932)    (14,932)
                                                                        ---------  ---------  ---------  -----------
    Total stockholders' equity (deficit)..............................    (15,706)   (15,765)    (8,241)     31,076
                                                                        ---------  ---------  ---------  -----------
      Total liabilities, redeemable convertible preferred stock, and
       stockholders' equity (deficit).................................  $  14,884  $  36,680  $  67,299   $  67,299
                                                                        ---------  ---------  ---------  -----------
                                                                        ---------  ---------  ---------  -----------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-3
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS ENDED
                                                                YEAR ENDED DECEMBER 31,            JUNE 30,
                                                            -------------------------------  ---------------------
                                                              1993       1994       1995       1995        1996
                                                            ---------  ---------  ---------  ---------  ----------
                                                                                                  (UNAUDITED)
<S>                                                         <C>        <C>        <C>        <C>        <C>
Revenues..................................................  $     620  $  18,802  $  54,287  $  19,245  $   53,772
Cost of revenues..........................................      2,574     14,124     33,469     11,921      31,058
                                                            ---------  ---------  ---------  ---------  ----------
    Gross profit (loss)...................................     (1,954)     4,678     20,818      7,324      22,714
                                                            ---------  ---------  ---------  ---------  ----------
Operating expenses:
  Research and development................................      2,044      2,867      5,730      2,264       5,894
  Selling, general, and administrative....................      2,509      5,051      9,660      3,962       7,901
  DSC litigation costs....................................        784      4,551      1,623        750      18,947
                                                            ---------  ---------  ---------  ---------  ----------
    Total operating expenses..............................      5,337     12,469     17,013      6,976      32,742
                                                            ---------  ---------  ---------  ---------  ----------
    Operating income (loss)...............................     (7,291)    (7,791)     3,805        348     (10,028)
Other income (expense):
  Equity in loss of joint venture.........................     --         --         (1,516)      (542)       (167)
  Other income, net.......................................     --             26        149         41          66
                                                            ---------  ---------  ---------  ---------  ----------
  Income (loss) before income taxes.......................     (7,291)    (7,765)     2,438       (153)    (10,129)
Income taxes (benefit)....................................     --         --             97          2      (8,588)
                                                            ---------  ---------  ---------  ---------  ----------
    Net income (loss).....................................  $  (7,291) $  (7,765) $   2,341  $    (155) $   (1,541)
                                                            ---------  ---------  ---------  ---------  ----------
                                                            ---------  ---------  ---------  ---------  ----------
Pro forma net income (loss) per share.....................                        $    0.09  $   (0.01) $    (0.06)
                                                                                  ---------  ---------  ----------
                                                                                  ---------  ---------  ----------
Shares used in per share computations.....................                           27,329     23,800      24,711
                                                                                  ---------  ---------  ----------
                                                                                  ---------  ---------  ----------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-4
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF REDEEMABLE
             CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT
                 YEARS ENDED DECEMBER 31, 1993, 1994, AND 1995
                       (IN THOUSANDS, EXCEPT SHARE DATA)
<TABLE>
<CAPTION>
                                    REDEEMABLE CONVERTIBLE
                                       PREFERRED STOCK           COMMON STOCK       ADDITIONAL
                                    ----------------------  ----------------------    PAID-IN    NOTES RECEIVABLE   ACCUMULATED
                                     SHARES      AMOUNT      SHARES      AMOUNT       CAPITAL    FROM STOCKHOLDERS    DEFICIT
                                    ---------  -----------  ---------  -----------  -----------  -----------------  ------------
<S>                                 <C>        <C>          <C>        <C>          <C>          <C>                <C>
Balances as of December 31,
 1992.............................     --       $  --       3,000,000   $      30    $     (15)      $  --           $     (676)
Conversion of notes payable to
 preferred stock..................  2,041,200       1,020      --          --           --              --               --
Issuance of preferred stock.......  6,070,888       3,035      --          --           --              --               --
Conversion of notes payable to
 preferred stock..................    400,000       1,000      --          --           --              --               --
Issuance of preferred stock.......  1,640,820       4,090      --          --           --              --               --
Exercise of common stock
 warrants.........................     --          --           6,472      --           --              --               --
Net loss..........................     --          --          --          --           --              --               (7,291)
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
Balances as of December 31,
 1993.............................  10,152,908      9,145   3,006,472          30          (15)         --               (7,967)
Issuance of preferred stock.......  3,000,000       7,436      --          --           --              --               --
Conversion of notes payable to
 preferred stock..................    200,000         500      --          --           --              --               --
Issuance of preferred stock.......  2,080,000       6,465      --          --           --              --               --
Exercise of common stock
 warrants.........................     --          --          64,472           1            7          --               --
Exercise of common stock
 options..........................     --          --          21,780      --                3          --               --
Net loss..........................     --          --          --          --           --              --               (7,765)
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
Balances as of December 31,
 1994.............................  15,432,908     23,546   3,092,724          31           (5)         --              (15,732)
Issuance of preferred stock.......  2,193,540      14,539      --          --           --              --               --
Repurchase of preferred stock.....   (615,244)       (308)     --          --           (3,848)         --               --
Sale of common stock for notes
 receivable.......................     --          --         563,600           6          170            (176)          --
Exercise of common stock
 warrants.........................     --          --       1,305,192          13        1,424          --               --
Exercise of common stock
 options..........................     --          --          53,652      --               11          --               --
Net income........................     --          --          --          --           --              --                2,341
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
Balances as of December 31,
 1995.............................  17,011,204     37,777   5,015,168          50       (2,248)           (176)         (13,391)
Issuance of preferred stock
 (unaudited)......................    220,000       1,540      --          --           --              --               --
Issuance of common stock in
 settlement of litigation
 (unaudited)......................     --          --         719,424           7        8,986          --               --
Exercise of common stock warrants
 (unaudited)......................     --          --          86,000           1           46          --               --
Exercise of common stock options
 (unaudited)......................     --          --         248,892           3           22          --               --
Net income (unaudited)............     --          --          --          --           --              --               (1,541)
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
Balances as of June 30, 1996
 (unaudited)......................  17,231,204  $  39,317   6,069,484   $      61    $   6,806       $    (176)      $  (14,932)
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
                                    ---------  -----------  ---------         ---   -----------          -----      ------------
 
<CAPTION>
 
                                        TOTAL
                                    STOCKHOLDERS'
                                       DEFICIT
                                    -------------
<S>                                 <C>
Balances as of December 31,
 1992.............................    $    (661)
Conversion of notes payable to
 preferred stock..................       --
Issuance of preferred stock.......       --
Conversion of notes payable to
 preferred stock..................       --
Issuance of preferred stock.......       --
Exercise of common stock
 warrants.........................       --
Net loss..........................       (7,291)
                                    -------------
Balances as of December 31,
 1993.............................       (7,952)
Issuance of preferred stock.......       --
Conversion of notes payable to
 preferred stock..................       --
Issuance of preferred stock.......       --
Exercise of common stock
 warrants.........................            8
Exercise of common stock
 options..........................            3
Net loss..........................       (7,765)
                                    -------------
Balances as of December 31,
 1994.............................      (15,706)
Issuance of preferred stock.......       --
Repurchase of preferred stock.....       (3,848)
Sale of common stock for notes
 receivable.......................       --
Exercise of common stock
 warrants.........................        1,437
Exercise of common stock
 options..........................           11
Net income........................        2,341
                                    -------------
Balances as of December 31,
 1995.............................      (15,765)
Issuance of preferred stock
 (unaudited)......................       --
Issuance of common stock in
 settlement of litigation
 (unaudited)......................        8,993
Exercise of common stock warrants
 (unaudited)......................           47
Exercise of common stock options
 (unaudited)......................           25
Net income (unaudited)............       (1,541)
                                    -------------
Balances as of June 30, 1996
 (unaudited)......................    $  (8,241)
                                    -------------
                                    -------------
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-5
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                                 SIX MONTHS ENDED
                                                                  YEAR ENDED DECEMBER 31,            JUNE 30,
                                                              -------------------------------  --------------------
                                                                1993       1994       1995       1995       1996
                                                              ---------  ---------  ---------  ---------  ---------
                                                                                                   (UNAUDITED)
<S>                                                           <C>        <C>        <C>        <C>        <C>
Cash flows from operating activities:
  Net income (loss).........................................  $  (7,291) $  (7,765) $   2,341  $    (155) $  (1,541)
  Adjustments to reconcile net income (loss) to net cash
   used in operating activities:
    Noncash portion of litigation settlement................     --         --         --         --         12,807
    Deferred income taxes...................................     --         --         --         --         (8,588)
    Depreciation and amortization...........................        111        199        547        136        321
    Equity in loss of joint venture.........................     --         --          1,516        542        167
    Changes in operating assets and liabilities:
      Accounts receivable...................................       (377)    (4,815)    (5,802)    (5,197)    (9,648)
      Inventories...........................................     (1,883)    (2,513)    (5,529)    (1,642)    (7,690)
      Prepaid expenses and other assets.....................        (54)      (109)      (169)        71       (274)
      Accounts payable......................................      1,270      1,266      4,516      2,657      4,029
      Accrued liabilities...................................      1,124      3,215      1,626        439      3,226
      Long-term liabilities.................................         94        (30)       (17)       (17)        22
                                                              ---------  ---------  ---------  ---------  ---------
        Net cash used in operating activities...............     (7,006)   (10,552)      (971)    (3,166)    (7,169)
                                                              ---------  ---------  ---------  ---------  ---------
Cash flows from investing activities:
  Acquisition of technology license.........................     --         --         (1,000)    --         --
  Purchase of property and equipment........................       (676)      (452)    (1,084)      (328)    (1,886)
  Advances to joint venture.................................     --         --         (1,516)      (542)      (167)
  Business acquisition, net of cash acquired................     --         --         --         --           (783)
                                                              ---------  ---------  ---------  ---------  ---------
        Net cash used in investing activities...............       (676)      (452)    (3,600)      (870)    (2,836)
                                                              ---------  ---------  ---------  ---------  ---------
Cash flows from financing activities:
  Proceeds from bank borrowings.............................     --         --          1,550        550      9,700
  Repayment of bank borrowings..............................     --         --         (1,550)    --         --
  Proceeds from stockholder loans...........................      1,000      1,000     --         --         --
  Repayment of stockholder loans............................     --           (500)    --         --         --
  Proceeds from issuance of redeemable convertible preferred
   stock....................................................      7,132     13,901     14,539     --         --
  Repurchase of redeemable convertible preferred stock......     --         --         (4,156)    --         --
  Proceeds from exercise of common stock options and
   warrants.................................................     --             11      1,448      1,234         72
                                                              ---------  ---------  ---------  ---------  ---------
        Net cash provided by financing activities...........      8,132     14,412     11,831      1,784      9,772
                                                              ---------  ---------  ---------  ---------  ---------
Increase (decrease) in cash and cash equivalents............        450      3,408      7,260     (2,252)      (233)
Cash and cash equivalents, beginning of period..............     --            450      3,858      3,858     11,118
                                                              ---------  ---------  ---------  ---------  ---------
Cash and cash equivalents, end of period....................  $     450  $   3,858  $  11,118  $   1,606  $  10,885
                                                              ---------  ---------  ---------  ---------  ---------
                                                              ---------  ---------  ---------  ---------  ---------
Noncash financing and investing activities:
  Conversion of notes payable to redeemable convertible
   preferred stock..........................................  $   2,021  $     500     --         --         --
  Issuance of preferred stock for business acquisition......     --         --         --         --      $   1,540
  Issuance of common stock for notes receivable.............     --         --      $     176  $     176     --
  Deferred portion of technology license fee................     --         --      $   1,500     --         --
</TABLE>
 
                See accompanying notes to financial statements.
 
                                      F-6
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    Advanced Fibre Communications, Inc. (the "Company") operates in one business
segment and designs, develops, manufactures, markets, and supports the Universal
Modular  Carrier 1000-TM-  (the "UMC"  system), a  cost-effective, multi-feature
digital loop  carrier system  developed to  serve small  line-size markets.  The
Company's UMC system is designed to enable telephone companies, cable companies,
and  other service providers to connect subscribers to the central office switch
for voice and  data communications  over copper,  fiber, coax  and analog  radio
networks.
 
    PRINCIPLES OF CONSOLIDATION
 
    The  consolidated financial statements  include the accounts  of the Company
and its  subsidiaries. All  significant intercompany  balances and  transactions
have  been  eliminated. The  Company's investments  in 50%  or less  owned joint
ventures are accounted for under the equity method.
 
    INTERIM FINANCIAL INFORMATION
 
    The accompanying  consolidated  balance  sheet  as of  June  30,  1996,  the
consolidated  statements of operations  and cash flows for  the six months ended
June 30, 1995 and 1996, and the consolidated statement of redeemable convertible
preferred stock and stockholders' deficit for the six months ended June 30, 1996
are unaudited  and,  in  the  opinion of  management,  include  all  adjustments
(consisting  of normal recurring accruals) necessary  for a fair presentation of
the periods presented. The consolidated results of operations for the six months
ended June  30, 1996,  are not  necessarily indicative  of the  results for  any
future period.
 
    CASH AND CASH EQUIVALENTS
 
    The Company considers all highly liquid investments with original maturities
of  three months or less  to be cash equivalents.  Cash and cash equivalents are
generally invested in money market  funds, are classified as  available-for-sale
securities  and their cost approximates their market value. Included in cash and
cash equivalents is $319,000, $833,000, and $150,000 as of December 31, 1994 and
1995, and June 30, 1996, respectively, held in escrow as collateral for bonds on
certain contracts. Also included in cash and cash equivalents as of December 31,
1995, is  $897,000 held  in escrow  related to  sales to  a particular  customer
pending  resolution of the litigation described  in Note 9. This escrow released
upon the settlement of the litigation described in Note 9.
 
    INVENTORIES
 
    Inventories are valued at the lower of first-in, first-out cost or market.
 
    PROPERTY AND EQUIPMENT
 
    Property and equipment are recorded at cost. Depreciation is computed  using
the  straight-line method  over the  estimated useful  lives, generally  five to
seven years, of the related assets.
 
    REVENUE RECOGNITION
 
    Revenue is generally recognized when  products are shipped. Product  returns
and uncollectible accounts have been insignificant to date.
 
    WARRANTY
 
    The Company provides for estimated warranty costs at the time of sale.
 
    INCOME TAXES
 
    The  Company accounts for income taxes  using the asset and liability method
of accounting.  Under  this method,  deferred  tax assets  and  liabilities  are
recognized    based    on    the    future    tax    consequences   attributable
 
                                      F-7
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES -- (CONTINUED)
to differences  between the  financial statement  carrying amounts  of  existing
assets  and  liabilities  and their  respective  tax bases.  The  measurement of
deferred tax assets is reduced, if  necessary, by a valuation allowance for  any
tax benefits that are not expected to be realized.
 
    PRO FORMA NET INCOME (LOSS) PER SHARE
 
    Pro forma net income (loss) per share is computed using the weighted average
number  of shares of common stock and redeemable convertible preferred stock, on
an as-if converted basis outstanding  and common equivalent shares from  options
and  warrants to  purchase common  stock using  the treasury  stock method, when
dilutive. In accordance  with certain Securities  and Exchange Commission  Staff
Accounting   Bulletins,  such  computations  included   all  common  and  common
equivalent shares  issued within  the  12 months  preceding the  initial  public
offering  ("IPO")  date  as  if  they were  outstanding  for  all  prior periods
presented using the treasury stock method and the estimated IPO price.
 
    CONCENTRATION OF CREDIT RISK
 
    Financial instruments potentially exposing the Company to concentrations  of
credit  risk consist primarily  of cash and cash  equivalents and trade accounts
receivable. Cash and cash equivalents are  deposited in a single regional  bank.
The  Company  manufactures  and  sells  its  products  principally  to telephone
companies.  To  reduce  credit  risk,   the  Company  performs  ongoing   credit
evaluations  of  its  customers'  financial  condition.  The  Company  does  not
generally require collateral.
 
    USE OF ESTIMATES
 
    The Company has made a number  of estimates and assumptions that affect  the
reported  amount 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 these estimates.
 
    PRO FORMA BALANCE SHEET
 
    Upon  closing  of  the Company's  proposed  IPO, all  outstanding  shares of
redeemable convertible preferred stock will be converted into 18,717,463  shares
of  common stock. The pro  forma consolidated balance sheet  as of June 30, 1996
reflects this conversion and also gives effect to the July 1996 bank  borrowings
and  the  payment  of the  remaining  obligations under  the  DSC Communications
Corporation ("DSC") litigation settlement (See Notes 7 and 9).
 
    FISCAL PERIODS
 
    The Company operates on 13-week fiscal quarters ending on the last  Saturday
of  the last  week of  each fiscal period.  For presentation  purposes only, its
fiscal periods are  shown as ending  on the  last day of  the respective  fiscal
period.
 
(2) JOINT VENTURES
 
    ADVANCED ACCESS LABS
 
    During  fiscal 1994, the  Company entered into  a joint venture partnership,
Advanced Access  Labs,  with  a  stockholder. The  joint  venture  designed  and
developed  a product  to allow telephone  services to be  provided over existing
cable TV  coaxial systems  as  well as  other  transmission media.  The  Company
contributed  the right to use its technology  in exchange for a 50% ownership in
the joint venture partnership. During 1995, the Company loaned $1,000,000 to the
joint venture. In addition, during 1995, and the six months ended June 30, 1996,
the Company made other net advances  to the joint venture totaling $516,000  and
$167,000,  respectively. The Company has recorded its proportionate share of the
joint venture's losses to the
 
                                      F-8
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(2) JOINT VENTURES -- (CONTINUED)
extent of  the Company's  loans  and advances  therein.  As a  consequence,  the
Company's  loans and advances  to the joint  venture have been  reduced to zero.
During the first  quarter of  1996, the Company  and the  joint venture  partner
entered  into  discussions  to dissolve  the  joint venture.  The  joint venture
partner  would  receive  a  development  license  and  certain  market   rights,
principally  in the cable  television market, in exchange  for which the Company
would receive royalties and reimbursement of all loans and advances made to  the
joint  venture  to date,  which totaled  $1,683,000 as  of June  30, 1996.  If a
definitive agreement is signed  on these proposed terms,  then the Company  will
record the reimbursement of loans and advances as a gain.
 
    Condensed  financial information of Advanced Access Labs is summarized below
(in thousands):
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,            JUNE 30,
                                                              --------------------  --------------------
                                                                1994       1995       1995       1996
                                                              ---------  ---------  ---------  ---------
                                                                                        (UNAUDITED)
<S>                                                           <C>        <C>        <C>        <C>
Total current assets........................................  $     313  $     800  $     939  $     635
Noncurrent assets...........................................      1,975      1,791      1,907      1,601
Current liabilities.........................................        318      4,646      2,476      5,616
Partner's equity (deficit)..................................      1,970     (2,055)      (369)    (3,380)
Net loss....................................................      2,030      4,025      1,601      1,325
</TABLE>
 
    In addition, the Company provided engineering and administrative support  to
the joint venture for which it received reimbursement of $577,000 during 1994.
 
    AFTEK HONG KONG
 
    On  April 11, 1996,  the Company acquired  all of the  outstanding shares of
AFTEK Hong Kong,  of which the  Company had previously  been a 49%  stockholder.
AFTEK  Hong Kong is a holding  company that owns 60% of  a joint venture that is
licensed to manufacture and sell  the Company's telecommunications equipment  in
China. Total consideration consisted of the following (in thousands):
 
<TABLE>
<S>                                                                           <C>
Issuance of Series F preferred stock........................................  $   1,540
Cash paid to retire note payable............................................        939
Acquisition costs incurred..................................................         79
                                                                              ---------
                                                                              $   2,558
                                                                              ---------
                                                                              ---------
</TABLE>
 
    The  acquisition  has  been  accounted  for  using  the  purchase  method of
accounting, and,  accordingly, the  purchase  price has  been allocated  to  the
assets purchased and the liabilities assumed based upon their fair values at the
date  of acquisition. The excess  of the purchase price  over the fair values of
the net assets acquired was $932,000 and has been recorded as goodwill, which is
being amortized on a straight-line basis over 5 years.
 
    Historical results of AFTEK  Hong Kong and pro  forma results of  operations
giving   effect  to  the  acquisition  have  not  been  presented  because  such
information is immaterial in relation to the Company's results of operations.
 
    During 1995  and  the  six months  ended  June  30, 1996,  the  Company  had
$2,020,000 and $260,000, respectively, of sales to AFTEK Hong Kong.
 
                                      F-9
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(3) INVENTORIES
    The major components of inventories are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                        --------------------
                                                                          1994       1995
                                                                        ---------  ---------   JUNE 30,
                                                                                                 1996
                                                                                              -----------
                                                                                              (UNAUDITED)
<S>                                                                     <C>        <C>        <C>
Raw materials.........................................................  $   3,459  $   5,155   $   9,716
Work-in-progress......................................................        236        899         874
Finished goods........................................................        925      4,095       8,738
                                                                        ---------  ---------  -----------
                                                                        $   4,620  $  10,149   $  19,328
                                                                        ---------  ---------  -----------
                                                                        ---------  ---------  -----------
</TABLE>
 
(4) PROPERTY AND EQUIPMENT
    A summary of property and equipment follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                                         --------------------
                                                                           1994       1995
                                                                         ---------  ---------   JUNE 30,
                                                                                                  1996
                                                                                               -----------
                                                                                               (UNAUDITED)
<S>                                                                      <C>        <C>        <C>
Furniture and fixtures.................................................  $     226  $     375   $     649
Computer and office equipment..........................................        708      1,204       2,183
Engineering equipment..................................................        427        865       1,715
                                                                         ---------  ---------  -----------
                                                                             1,361      2,444       4,547
Less accumulated depreciation..........................................        319        616         937
                                                                         ---------  ---------  -----------
    Net property and equipment.........................................  $   1,042  $   1,828   $   3,610
                                                                         ---------  ---------  -----------
                                                                         ---------  ---------  -----------
</TABLE>
 
(5) ACCRUED LIABILITIES
    A summary of accrued liabilities follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31,
                                                                         --------------------
                                                                           1994       1995
                                                                         ---------  ---------   JUNE 30,
                                                                                                  1996
                                                                                               -----------
                                                                                               (UNAUDITED)
<S>                                                                      <C>        <C>        <C>
DSC litigation costs...................................................  $   2,766  $   2,674   $   8,218
Warranty...............................................................        285        852       2,214
Other..................................................................      1,325      2,975       4,176
                                                                         ---------  ---------  -----------
                                                                         $   4,376  $   6,501   $  14,608
                                                                         ---------  ---------  -----------
                                                                         ---------  ---------  -----------
</TABLE>
 
                                      F-10
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(6) INCOME TAXES
    A   summary  of  the  components  of  income  taxes  (benefit)  follows  (in
thousands):
 
<TABLE>
<CAPTION>
                                                                            CURRENT     DEFERRED     TOTAL
                                                                          -----------  ----------  ---------
<S>                                                                       <C>          <C>         <C>
Six months ended June 30, 1996 (unaudited):
  Federal...............................................................   $  --       $   (6,974) $  (6,974)
  State.................................................................                   (1,614)    (1,614)
                                                                                 ---   ----------  ---------
                                                                           $  --       $   (8,588) $  (8,588)
                                                                                 ---   ----------  ---------
                                                                                 ---   ----------  ---------
Year ended December 31, 1995:
  Federal...............................................................   $      82   $   --      $      82
  State.................................................................          15       --             15
                                                                                 ---   ----------  ---------
                                                                           $      97   $   --      $      97
                                                                                 ---   ----------  ---------
                                                                                 ---   ----------  ---------
</TABLE>
 
    Income taxes (benefit) differs from the amount computed by applying the U.S.
federal statutory rate of  34% to income (loss)  before income taxes as  follows
(in thousands):
 
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS
                                                                  YEAR ENDED DECEMBER 31,      ENDED JUNE
                                                              -------------------------------      30,
                                                                1993       1994       1995        1996
                                                              ---------  ---------  ---------  -----------
<S>                                                           <C>        <C>        <C>        <C>
                                                                                               (UNAUDITED)
Income taxes (benefit) at statutory rate....................  $  (2,479) $  (2,640) $     829   $  (3,444)
Current losses and temporary differences for which no
 benefit was recognized.....................................      2,479      2,640     --          --
Alternative minimum tax.....................................     --         --             82      --
State taxes net of federal benefit..........................     --         --             15        (629)
Change in valuation allowance...............................     --         --           (847)     (4,687)
Other.......................................................     --         --             18         172
                                                              ---------  ---------  ---------  -----------
                                                              $  --         --      $      97   $  (8,588)
                                                              ---------  ---------  ---------  -----------
                                                              ---------  ---------  ---------  -----------
</TABLE>
 
                                      F-11
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(6) INCOME TAXES -- (CONTINUED)
    The  tax  effects of  temporary differences  that  give rise  to significant
portions of deferred tax assets and liabilities are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                       --------------------   JUNE 30,
                                                                         1994       1995        1996
                                                                       ---------  ---------  -----------
<S>                                                                    <C>        <C>        <C>
                                                                                             (UNAUDITED)
Deferred tax assets:
  Net operating loss carryforwards...................................  $   4,099  $   3,316   $   5,493
  DSC settlement costs...............................................     --         --           1,267
  Allowances and accruals............................................      1,789      1,914       1,824
  Research tax credit carryforwards..................................        374     --          --
  Other..............................................................         52          6           4
                                                                       ---------  ---------  -----------
                                                                           6,314      5,236       8,588
                                                                       ---------  ---------  -----------
Deferred tax liability -- investment in joint venture................     --           (549)     --
                                                                       ---------  ---------  -----------
                                                                           6,314      4,687       8,588
Less valuation allowance.............................................     (6,314)    (4,687)     --
                                                                       ---------  ---------  -----------
Net deferred tax asset...............................................  $  --      $  --       $   8,588
                                                                       ---------  ---------  -----------
                                                                       ---------  ---------  -----------
</TABLE>
 
    As of December 31, 1995, the Company had net operating loss carryforwards of
approximately $9,000,000 and  $3,800,000 for federal  and California income  tax
purposes,  respectively. The difference in  the net operating loss carryforwards
between  tax  jurisdictions   results  primarily  from   a  50%  limitation   on
carryforwards  for California purposes. Federal net operating loss carryforwards
expire from  2007  through 2010.  California  net operating  loss  carryforwards
expire from 1998 through 2000.
 
    Federal  and state  tax laws impose  restrictions on the  utilization of net
operating losses in the event of an "ownership change" of a corporation. All net
operating loss carryforwards  are subject  to limitation  as a  result of  these
restrictions;  however, the  ownership change  restrictions are  not expected to
impair the Company's ability to utilize the affected carryforward items.
 
(7) BANK BORROWINGS
    The Company  has  a revolving  line  of credit  with  a bank  providing  for
borrowings  up to $12,000,000 at an interest rate of prime plus 0.5%. Borrowings
under the line  are secured by  the Company's accounts  receivable. The line  of
credit  expires on November 15, 1996. The line of credit contains covenants that
require the Company to maintain certain  financial ratios. As of June 30,  1996,
the  Company was in compliance with the covenants contained in the agreement. As
of December 31, 1994 and 1995, no borrowings were outstanding under the line  of
credit.  As of June 30, 1996, $9,700,000 was outstanding and $1,736,000 remained
available under the line of credit.
 
    In July  1996,  the Company  borrowed  approximately $7.1  million  under  a
six-month  term loan. The proceeds from the  loan were used to pay the remaining
obligations under the  DSC litigation settlement  (See Note 9).  The loan  bears
interest at 5.75% and has a $4.0 million compensating balance requirement.
 
                                      F-12
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(8)
    REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
 
    REDEEMABLE CONVERTIBLE PREFERRED STOCK
 
    As  of December 31, 1994 and  1995, and June 30,1996, redeemable convertible
preferred stock consisted of the following:
 
<TABLE>
<CAPTION>
                                                                   SHARES ISSUED AND OUTSTANDING
                                                              ----------------------------------------
                                                                     DECEMBER 31,
                                                   SHARES     --------------------------
                    SERIES                       AUTHORIZED       1994          1995
                    ------                      ------------  ------------  ------------    JUNE 30,
                                                                                              1996
                                                                                          ------------
                                                                                          (UNAUDITED)
<S>                                             <C>           <C>           <C>           <C>
A.............................................    16,224,176     8,112,088     7,496,844     7,496,844
B.............................................     4,081,640     2,040,820     2,040,820     2,040,820
C.............................................     6,400,000     3,200,000     3,200,000     3,200,000
D.............................................     4,160,000     2,080,000     2,080,000     2,080,000
E.............................................     4,480,000       --          2,193,540     2,193,540
F.............................................       220,000       --            --            220,000
                                                ------------  ------------  ------------  ------------
                                                  35,565,816    15,432,908    17,011,204    17,231,204
                                                ------------  ------------  ------------  ------------
                                                ------------  ------------  ------------  ------------
</TABLE>
 
    Redeemable convertible preferred stock has a liquidation preference equal to
the issue price and is entitled to dividends (if declared) in priority to common
stock on a noncumulative basis and is subject to a voting agreement.  Redeemable
convertible  preferred stock is convertible into common stock using a conversion
price formula and is redeemable  by the Company, at the  option of the Board  of
Directors, or at the request of the holders, on or after January 1, 2000.
 
    Each  year, beginning  in 1995,  the Company  is obligated  to indemnify the
holders of redeemable convertible preferred stock, except for holders of  Series
F  preferred stock, for  any costs, expenses,  damages, or liabilities resulting
from the litigation described in Note 9. This indemnification is effected  using
a  formula  that adjusts  the conversion  price  of each  redeemable convertible
preferred stock series. As  of June 30, 1996,  the number of shares  convertible
after  giving  effect  to  the  formula  were  8,220,739,  2,237,878, 3,508,988,
2,280,844, and 2,249,014 for Series  A, B, C, D,  and E, respectively. Series  F
redeemable convertible preferred stock had no indemnification provision.
 
    In  1993,  $1,000,000  was loaned  to  the  Company by  stockholders  of the
Company. These  loans  were  subsequently  converted  to  Series  A  convertible
preferred stock.
 
    In  1994,  $1,000,000  was loaned  to  the  Company by  stockholders  of the
Company. Loans totaling $500,000 were converted to Series C preferred stock  and
$500,000 was repaid using proceeds from the issuance of preferred stock.
 
                                      F-13
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(8) REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT) -- (CONTINUED)
    COMMON STOCK WARRANTS
 
    Warrants to purchase shares of common stock were issued to investors as part
of  the preferred  stock agreements. The  warrants expire beginning  in 1998 and
ending in 2000 and are summarized as follows:
 
<TABLE>
<CAPTION>
                                                                                           EXERCISE
                                                                            NUMBER          PRICE
                                                                           OF SHARES      PER SHARE
                                                                          -----------  ----------------
<S>                                                                       <C>          <C>
Warrants outstanding as of December 31, 1993............................      941,156  $  0.03 --  0.13
  Issued................................................................    5,619,520     0.25 --  1.17
  Exercised.............................................................      (64,472)       0.03
                                                                          -----------
Warrants outstanding as of December 31, 1994............................    6,496,204     0.03 --  1.17
  Issued................................................................       30,068        7.00
  Exercised.............................................................   (1,305,192)    0.03 --  1.17
                                                                          -----------
Warrants outstanding as of December 31, 1995............................    5,221,080     0.03 --  7.00
  Issued................................................................      --              --
  Exercised.............................................................      (86,000)    0.03 --  1.17
                                                                          -----------
Warrants outstanding as of June 30, 1996................................    5,135,080     0.03 --  7.00
                                                                          -----------
                                                                          -----------
</TABLE>
 
    COMMON STOCK OPTIONS
 
    Under the  Company's 1993  Stock Option/Stock  Issuance Plan  (the  "Plan"),
options  to purchase up to an aggregate  of 6,500,000 shares of common stock may
be granted to key employees, directors,  and consultants. The Plan provides  for
issuing both incentive stock options, which must be granted at fair market value
at  the date of grant, and nonqualified  stock options, which must be granted at
not less than 85% of fair market value of the stock. All incentive stock options
to date have been granted at the fair market value of the stock as determined by
the Board of  Directors (the "Board").  Options under the  Plan are  exercisable
immediately,  but when exercised shares issued  are subject to repurchase by the
Company at the exercise price. The  Company's right to repurchase expires as  to
20% after the first year and ratably thereafter over each of the next 48 months,
subject  to continued employment. The  options expire 10 years  from the date of
grant and are normally  canceled three months  after termination of  employment.
The Board administers the Plan.
 
                                      F-14
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(8) REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT) -- (CONTINUED)
    The following summarizes activity in the Plan:
 
<TABLE>
<CAPTION>
                                                                                          EXERCISE
                                                             AVAILABLE     NUMBER          PRICE
                                                             FOR GRANT    OF SHARES      PER SHARE
                                                            -----------  -----------  ----------------
 
<S>                                                         <C>          <C>          <C>
Options outstanding as of December 31, 1993...............    1,792,000    1,608,000  $  0.03 --  0.25
  Granted.................................................   (1,238,080)   1,238,080     0.25 --  0.32
  Exercised...............................................      --           (21,780)    0.03 --  0.25
  Canceled................................................       90,020      (90,020)    0.03 --  0.25
                                                            -----------  -----------
Options outstanding as of December 31, 1994...............      643,940    2,734,280     0.03 --  0.32
  Authorized..............................................    1,600,000      --              --
  Granted.................................................   (1,274,036)   1,274,036     0.32 --  1.50
  Exercised...............................................      --           (53,652)    0.03 --  0.25
  Canceled................................................       64,648      (64,648)    0.03 --  0.32
                                                            -----------  -----------
Options outstanding as of December 31, 1995...............    1,034,552    3,890,016     0.03 --  1.50
  Authorized (unaudited)..................................    1,500,000      --                     --
  Granted (unaudited).....................................     (622,582)     622,582     0.32 -- 12.50
  Exercised (unaudited)...................................      --          (248,892)    0.03 --  0.32
  Canceled (unaudited)....................................      186,788     (186,788)    0.03 --  1.50
                                                            -----------  -----------
Options outstanding as of June 30, 1996 (unaudited).......    2,098,758    4,076,918     0.03 -- 12.50
                                                            -----------  -----------
                                                            -----------  -----------
Exercisable as of December 31, 1995.......................                 1,189,402     0.03 --  1.50
                                                                         -----------
                                                                         -----------
</TABLE>
 
    In  July  and August  1996, the  Board granted  options to  purchase 269,700
shares of common stock under the Plan  to certain employees of the Company.  The
options vest over a five-year period and have exercise prices ranging from $1.50
to $12.00 per share.
 
    STOCK SPLIT AND REINCORPORATION
 
    In  September 1995, the Company's Board  of Directors approved a two-for-one
stock split and  reincorporation of  the Company in  the state  of Delaware.  In
August  1996, the  Company's Board of  Directors approved  a further two-for-one
stock split. The accompanying financial statements and notes have been  restated
to give effect to the stock splits and reincorporation.
 
(9) COMMITMENTS AND CONTINGENCIES
 
    LEASES
 
    The  Company  leases  office  space and  certain  equipment  under operating
leases. Future minimum payments under operating  leases with an initial term  of
more  than  one year  as  of December  31, 1995  are  summarized as  follows (in
thousands):
 
<TABLE>
<S>                                                                          <C>
1996.......................................................................  $   1,455
1997.......................................................................      1,657
1998.......................................................................      1,413
1999.......................................................................      1,046
Thereafter.................................................................      5,106
                                                                             ---------
Total minimum lease payments...............................................  $  10,677
                                                                             ---------
                                                                             ---------
</TABLE>
 
                                      F-15
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
         (INFORMATION AS OF JUNE 30, 1996 AND FOR THE SIX MONTHS ENDED
                      JUNE 30, 1995 AND 1996 IS UNAUDITED)
 
(9) COMMITMENTS AND CONTINGENCIES -- (CONTINUED)
    Total  rent  expense  for  all  operating  leases  was  $182,000,  $462,000,
$887,000,  and $1,019,000 for the years ended December 31, 1993, 1994, and 1995,
and the six months ended June 30, 1996, respectively.
 
    LITIGATION
 
    From July 1993 until June 1996  the Company was involved in litigation  with
DSC.  DSC  alleged,  among  other  things,  that  the  Company's  UMC technology
contained or was derived from trade secrets and other proprietary technology  of
DSC.  The parties entered into a  Settlement Agreement and Mutual Releases dated
as of  June  24,  1996  (the "Settlement  Agreement"),  pursuant  to  which  the
litigation  was terminated.  Under the  terms of  the Settlement  Agreement, the
Company paid DSC $3,000,000 in June 1996, agreed to pay DSC up to an  additional
$8,500,000  through 2001, and issued 719,424 shares  of common stock to DSC (see
Note 7). The settlement amount was recorded during the first six months of  1996
as  a charge of  $15,807,000. Under the  terms of the  Settlement Agreement, AFC
maintains all rights to the UMC technology free and clear of any claim by DSC.
 
    EMPLOYEE BENEFITS
 
    The Company has a 401(k) plan under which employees may contribute a portion
of their compensation on a tax deferred  basis to the plan. The Company, at  its
discretion,  may contribute to the  plan on a matching basis  up to a maximum of
$5,000 per employee per year. The Company is the plan administrator. During 1995
and the first six months of 1996, the Company contributed $133,000 and  $216,000
to the plan.
 
(10)COMPANY INFORMATION AND CERTAIN CONCENTRATIONS
    During  1995 and the  first six months  of 1996, one  customer accounted for
approximately 16% of revenues in each period. During 1994, a different  customer
accounted  for  27%  of  revenues.  During  fiscal  1993,  a  different customer
accounted for 20% of revenues. Export sales were 19%, 13%, and 13% during  1994,
1995 and the six months ended June 30, 1996, respectively.
 
    The Company currently derives substantially all of its revenue from the UMC,
and expects that this concentration will continue for the foreseeable future. As
a  result, any factor adversely affecting the demand for, or pricing of, the UMC
could have a material  adverse effect on the  Company's business and results  of
operations.
 
    The  Company's  manufacturing operations  consist of  the final  assembly of
out-sourced parts and  components, followed by  testing. Although the  Company's
product  designs employ primarily industry standard hardware, certain components
are only available through limited sources of supply. The Company's  proprietary
integrated  circuits,  codec  components,  and  some  surface  mount  technology
components and  other components  are  available from  limited sources.  If  the
Company  cannot  obtain essential  components as  required,  the Company  may be
unable to  meet  demand  for  its  products,  thereby  adversely  affecting  its
operating results. In addition, scarcity of such components could result in cost
increases that adversely affect the Company's gross margin.
 
    The  Company's printed circuit board  assemblies and channel bank assemblies
are provided by  a limited  number of outside  turnkey suppliers.  In the  event
operations of these turnkey suppliers are impaired or they are unable to support
the  manufacturing requirements of the  Company, the Company's operating results
could be adversely affected.
 
                                      F-16
<PAGE>
               REPORT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS
 
Joint Venture Partners
Advanced Access Labs
 
    We  have audited the accompanying balance  sheets of Advanced Access Labs (a
California partnership) as of December 30,  1994 and December 29, 1995, and  the
related statements of operations, partners' equity (deficit), and cash flows for
the period April 11, 1994 (inception) through December 30, 1994 and for the year
ended  December 29, 1995.  These financial statements  are the responsibility of
the Joint Venture's management. Our responsibility  is to express an opinion  on
these financial statements based on our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our opinion, the financial statements  referred to above present fairly,
in all material respects, the financial  position of Advanced Access Labs as  of
December  30, 1994 and December 29, 1995,  and the results of its operations and
its cash flows for  the period April 11,  1994 (inception) through December  30,
1994  and for  the year  ended December 29,  1995, in  conformity with generally
accepted accounting principles.
 
GRANT THORNTON LLP
San Francisco, California
January 18, 1996 (except for Note G,
  as to which the date is April 3, 1996)
 
                                      F-17
<PAGE>
                              ADVANCED ACCESS LABS
                                  BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                      DECEMBER 30,   DECEMBER 29,
                                                                                          1994           1995
                                                                                      -------------  -------------
<S>                                                                                   <C>            <C>
Current assets:
  Cash and cash equivalents.........................................................  $     313,143  $     800,287
                                                                                      -------------  -------------
    Total current assets............................................................        313,143        800,287
Property and equipment, net of accumulated depreciation of $13,854 and $58,481......        180,553        490,886
Investment..........................................................................         90,000       --
Intangibles, net of accumulated amortization of $300,000 and $700,000...............      1,700,000      1,300,000
Deposits............................................................................          4,190       --
                                                                                      -------------  -------------
      Total assets..................................................................  $   2,287,886  $   2,591,173
                                                                                      -------------  -------------
                                                                                      -------------  -------------
 
                                    LIABILITIES AND PARTNERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable and accrued liabilities..........................................  $      83,780  $     151,485
  Payable to Advanced Fibre Communications, Inc.....................................          7,738        516,480
  Payable to Tellabs................................................................        226,156      2,977,720
  Loan payable to Advanced Fibre Communications, Inc................................       --            1,000,000
                                                                                      -------------  -------------
    Total current liabilities.......................................................        317,674      4,645,685
Partners' equity (deficit):
  Partners' contributions...........................................................      4,000,000      4,000,000
  Accumulated deficit...............................................................     (2,029,788)    (6,054,512)
                                                                                      -------------  -------------
    Partners' equity (deficit)......................................................      1,970,212     (2,054,512)
                                                                                      -------------  -------------
      Total liabilities and partners' equity (deficit)..............................  $   2,287,886  $   2,591,173
                                                                                      -------------  -------------
                                                                                      -------------  -------------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                      F-18
<PAGE>
                              ADVANCED ACCESS LABS
                            STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                                              APRIL 11, 1994
                                                                                (INCEPTION)
                                                                                  THROUGH          YEAR ENDED
                                                                             DECEMBER 30, 1994  DECEMBER 29, 1995
                                                                             -----------------  -----------------
<S>                                                                          <C>                <C>
Product sales..............................................................    $    --            $     244,500
Costs and expenses:
  Cost of goods sold.......................................................         --                  150,002
  Research and development.................................................        2,037,670          3,902,438
  General and administrative...............................................           17,137            200,456
  Other (income) expenses..................................................          (25,019)            16,328
                                                                             -----------------  -----------------
    Total costs and expenses...............................................        2,029,788          4,269,224
                                                                             -----------------  -----------------
    Net loss...............................................................    $   2,029,788      $   4,024,724
                                                                             -----------------  -----------------
                                                                             -----------------  -----------------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                      F-19
<PAGE>
                              ADVANCED ACCESS LABS
 
                    STATEMENT OF PARTNERS' EQUITY (DEFICIT)
 
              APRIL 11, 1994 (INCEPTION) THROUGH DECEMBER 30, 1994
                                      AND
                          YEAR ENDED DECEMBER 29, 1995
 
<TABLE>
<CAPTION>
                                                                         PARTNERS'     ACCUMULATED
                                                                        CONTRIBUTION     DEFICIT         TOTAL
                                                                        ------------  -------------  -------------
<S>                                                                     <C>           <C>            <C>
Cash contribution.....................................................  $  2,000,000  $    --        $   2,000,000
Contribution of use of technology.....................................     2,000,000       --            2,000,000
Net loss for the period...............................................       --          (2,029,788)    (2,029,788)
                                                                        ------------  -------------  -------------
Balance at December 30, 1994..........................................     4,000,000     (2,029,788)     1,970,212
Net loss for the year.................................................       --          (4,024,724)    (4,024,724)
                                                                        ------------  -------------  -------------
Balance at December 29, 1995..........................................  $  4,000,000  $  (6,054,512) $  (2,054,512)
                                                                        ------------  -------------  -------------
                                                                        ------------  -------------  -------------
</TABLE>
 
         The accompanying notes are an integral part of this statement.
 
                                      F-20
<PAGE>
                              ADVANCED ACCESS LABS
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                                              APRIL 11, 1994
                                                                                (INCEPTION)
                                                                                  THROUGH          YEAR ENDED
                                                                             DECEMBER 30, 1994  DECEMBER 29, 1995
                                                                             -----------------  -----------------
<S>                                                                          <C>                <C>
Increase (decrease) in cash and cash equivalents
Cash flows from operating activities:
  Net loss.................................................................    $  (2,029,788)     $  (4,024,724)
  Adjustment to reconcile net loss to net cash used in operating
   activities:
    Amortization of intangibles............................................          300,000            400,000
    Depreciation...........................................................           13,854             44,627
    Distribution of investment to employees of joint venture partners......         --                   90,000
    Change in assets and liabilities:
      Deposits.............................................................           (4,190)             4,190
      Accounts payable and accrued liabilities.............................           83,780             67,705
      Payable to Advanced Fibre Communications, Inc........................            7,738            508,742
      Payable to Tellabs...................................................          226,156          2,751,564
                                                                             -----------------  -----------------
        Net cash used in operating activities..............................       (1,402,450)          (157,896)
Cash flows from investing activities:
  Purchase of property and equipment.......................................         (194,407)          (354,960)
  Purchase of investment...................................................          (90,000)          --
                                                                             -----------------  -----------------
        Net cash used in investing activities..............................         (284,407)          (354,960)
Cash flows from financing activities:
  Proceeds from issuance of note...........................................         --                1,000,000
  Partners' cash contributions.............................................        2,000,000           --
                                                                             -----------------  -----------------
        Net cash provided by financing activities..........................        2,000,000          1,000,000
                                                                             -----------------  -----------------
Net increase in cash and cash equivalents..................................          313,143            487,144
Cash and cash equivalents, beginning of period.............................         --                  313,143
                                                                             -----------------  -----------------
Cash and cash equivalents at end of year...................................    $     313,143      $     800,287
                                                                             -----------------  -----------------
                                                                             -----------------  -----------------
</TABLE>
 
        The accompanying notes are an integral part of these statements.
 
                                      F-21
<PAGE>
                              ADVANCED ACCESS LABS
                         NOTES TO FINANCIAL STATEMENTS
                    DECEMBER 30, 1994 AND DECEMBER 29, 1995
 
NOTE A -- BUSINESS AND SUMMARY OF ACCOUNTING POLICIES
    Advanced Access Labs (the "Joint Venture")  is a partnership by and  between
Advanced  Fibre  Communications, Inc.  and  Tellabs Operations,  Inc.  The Joint
Venture is engaged in the  design and development of  a product line which  will
allow telephone services to be provided over existing cable television installed
coaxial systems as well as other transmission media.
 
    A  summary of the significant accounting policies applied in the preparation
of the accompanying financial statements follows:
 
    BASIS OF PRESENTATION
 
    The Joint Venture was in the development stage as of December 30, 1994,  and
for   the  period  April  11,  1994   (inception)  through  December  30,  1994.
Accordingly, its  prior financial  statements were  presented as  a  development
stage  company.  In  1995, the  Joint  Venture  commenced sales  of  its initial
products; accordingly,  the  Joint Venture  is  no  longer considered  to  be  a
development stage company.
 
    CASH AND CASH EQUIVALENTS
 
    The  Joint Venture  considers all  highly liquid  debt instruments purchased
with a  maturity of  three months  or less  to be  cash equivalents.  The  Joint
Venture's  cash balances are maintained in  one financial institution located in
California, which  at  times may  exceed  federally insured  limits.  The  Joint
Venture  has not experienced any  losses in such account  and believes it is not
exposed to any significant risk on cash and cash equivalents.
 
    PROPERTY AND EQUIPMENT
 
    Property and  equipment is  depreciated utilizing  the straight-line  method
over 7 years.
 
    INTANGIBLES
 
    Intangibles  represent the value assigned to  the contribution by one of the
venture partners of the right to  use certain technology in the Joint  Venture's
research and development activities. This intangible is being amortized based on
the  straight-line  method  over  the  estimated  period  (5  years)  which  the
technology will be utilized in  continuing research and development  activities.
Amortization of this intangible is included as research and development expenses
in the statement of operations.
 
    RESEARCH AND DEVELOPMENT
 
    The  Joint  Venture  conducts research  and  development in  the  design and
development of a product line which will allow telephone services to be provided
over existing  cable  television installed  coaxial  systems as  well  as  other
transmission media. All research and development costs are expensed.
 
    INCOME TAXES
 
    No  provision has been made  for federal or state  income taxes (or credits)
since such items are the responsibility of the partners.
 
    PROFITS, LOSSES AND DISTRIBUTIONS
 
    Profits  and  losses  are  allocated   equally  among  the  partners.   Cash
distributions  of excess cash, if  any, will be made  equally to the partners in
accordance with the terms of the Joint Venture and Partnership Agreement.
 
    USE OF ESTIMATES IN THE FINANCIAL STATEMENTS
 
    In preparing  financial statements  in  conformity with  generally  accepted
accounting  principles, management is required to make estimates and assumptions
that affect the reported amounts of assets and liabilities and the disclosure of
contingent assets and liabilities  at the date of  the financial statements  and
revenues  and expenses during the reporting  period. Actual results could differ
from those estimates.
 
                                      F-22
<PAGE>
                              ADVANCED ACCESS LABS
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
                    DECEMBER 30, 1994 AND DECEMBER 29, 1995
 
NOTE B -- PROPERTY AND EQUIPMENT
    Property and equipment are comprised of the following:
 
<TABLE>
<CAPTION>
                                                                   DECEMBER 30,  DECEMBER 29,
                                                                       1994          1995
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Furniture and fixtures...........................................   $   14,591    $   22,351
Computer equipment...............................................       71,011       221,198
Other equipment..................................................      108,805       281,729
Leasehold improvements...........................................       --            24,089
                                                                   ------------  ------------
                                                                       194,407       549,367
Less: accumulated depreciation...................................      (13,854)      (58,481)
                                                                   ------------  ------------
                                                                    $  180,553    $  490,886
                                                                   ------------  ------------
                                                                   ------------  ------------
</TABLE>
 
NOTE C -- INVESTMENT
    As of December 30,  1994 the Joint Venture  owned 28,800 shares of  Advanced
Fibre  Communications,  Inc. Series  D Preferred  Stock  (adjusted to  reflect a
two-for-one stock split effected in September 1995 and a two-for-one stock split
effected in August 1996).  These shares were purchased  by the Joint Venture  as
part  of an incentive program to certain  personnel working on the Joint Venture
project. During the year ended December 29, 1995, these shares were  distributed
to employees of the Joint Venture Partners.
 
NOTE D -- NOTE PAYABLE
    The  Joint Venture has a note payable to Advanced Fibre Communications, Inc.
with interest at a rate  of 5.5% per annum.  The principal amount together  with
accrued  interest is due, on  the earlier to occur of  June 30, 1996, or written
demand by Advanced Fibre Communications, Inc.
 
NOTE E -- RELATED PARTY TRANSACTIONS
    The  Joint   Venture  utilizes   the  services   of  both   Advanced   Fibre
Communications,  Inc. and Tellabs  to conduct its  activities. The Joint Venture
has no  employees; its  research and  development, as  well as  its general  and
administrative  activities,  are performed  by  employees of  the  Partners. The
Partners bill  the Joint  Venture for  their services.  In addition,  the  Joint
Venture  occupies space  at Advanced Fibre  Communications, Inc.  and at Tellabs
Operations Inc.  facilities,  for which  it  is  charged based  upon  the  space
utilized. For the period ended December 30, 1994 and the year ended December 29,
1995, facility rent expense was $11,808 and $36,688, respectively. Certain other
expenses  of the Joint Venture  are paid for by the  Partners and are charged to
the Joint Venture at cost.
 
NOTE F -- JOINT VENTURE AND PARTNERSHIP AGREEMENT
    The Joint Venture and Partnership Agreement (the Agreement) was entered into
on April 11, 1994.  The Agreement required Tellabs  to contribute $2 million  in
cash   and  the  right  to  the  use   of  a  marketing  study;  Advanced  Fibre
Communications, Inc. was required to  contribute the use of certain  technology.
The contributions of each Partner have been recorded at $2 million. Each Partner
has  a 50% interest  in the Joint  Venture. The Agreement  provides, among other
things, that  sales of  the Joint  Venture products  will be  made only  to  the
Partners  who will then  market the products  to customers in  their markets (as
defined in the Agreement.) The term of the Agreement is 15 years.
 
NOTE G -- SUBSEQUENT EVENTS
    Effective  April  3,  1996,  the  Joint  Venture  Partners  entered  into  a
Memorandum  of Understanding which calls for  the distribution of all assets and
the liquidation  of  all  liabilities  among the  Partners.  The  terms  of  the
Memorandum  of  Understanding  are  subject  to  the  signing  of  a  definitive
agreement.
 
                                      F-23
<PAGE>
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