ADVANCED FIBRE COMMUNICATIONS INC
S-1, 1997-01-24
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 24, 1997
                                                           REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                              -------------------
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                            <C>
           DELAWARE                          3661                  68-0277743
 (State or other jurisdiction    (Primary Standard Industrial   (I.R.S. Employer
              of                 Classification Code Number)     Identification
incorporation or organization)                                        No.)
</TABLE>
 
                         1445 MCDOWELL BOULEVARD NORTH
                               PETALUMA, CA 94954
                                 (707) 794-7700
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                             ---------------------
                                  DONALD GREEN
               CHAIRMAN OF THE BOARD AND CHIEF EXECUTIVE OFFICER
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                         1445 MCDOWELL BOULEVARD NORTH
                               PETALUMA, CA 94954
                                 (707) 794-7700
  (Name and address, including zip code, and telephone number, including area
                          code, of agent for service)
                             ---------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                                 <C>
              SCOTT D. LESTER, ESQ.                              KENNETH M. SIEGEL, ESQ.
              DAVID R. GILBERT, ESQ.                             TAMARA G. MATTISON, ESQ.
         BROBECK, PHLEGER & HARRISON LLP                     WILSON SONSINI GOODRICH & ROSATI
                    ONE MARKET                                   PROFESSIONAL CORPORATION
                SPEAR STREET TOWER                                  650 PAGE MILL ROAD
             SAN FRANCISCO, CA 94105                             PALO ALTO, CA 94304-1050
                  (415) 442-0900                                      (415) 493-9300
</TABLE>
 
                              -------------------
    APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: AS SOON AS
PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
 
    If any of the securities being registered on this form are to be offered  on
a  delayed or continuous basis pursuant to  Rule 415 under the Securities Act of
1933, check the following box. / /
 
    If this Form  is filed  to register  additional securities  for an  offering
pursuant  to Rule 462(b) under  the Securities Act, check  the following box and
list the  Securities  Act registration  statement  number of  earlier  effective
registration statement for the same offering. / /
 
    If  this Form  is a post-effective  amendment filed pursuant  to Rule 462(c)
under the Securities Act,  check the following box  and list the Securities  Act
registration  statement number  of the earlier  effective registration statement
for the same offering. / /
 
    If delivery of the prospectus is expected  to be made pursuant to Rule  434,
please check the following box. / /
                              -------------------
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<CAPTION>
                                                                        PROPOSED MAXIMUM    PROPOSED MAXIMUM       AMOUNT OF
             TITLE OF EACH CLASS OF                   AMOUNT TO BE       OFFERING PRICE    AGGREGATE OFFERING   REGISTRATION FEE
           SECURITIES TO BE REGISTERED               REGISTERED (1)      PER SHARE (2)         PRICE (2)              (3)
<S>                                                <C>                 <C>                 <C>                 <C>
Common Stock, $.01 par value.....................      2,990,000            $51.875           $155,106,250          $47,002
</TABLE>
 
(1)  Includes  390,000 shares  that  the U.S.  Underwriters  have the  option to
    purchase to cover over-allotments, if any.
 
(2) The proposed maximum offering price per share is based on the average of the
    high and low prices for a share of the Company's Common Stock as reported on
    the Nasdaq National Market on January 22, 1997.
 
(3) Estimated pursuant to Rule 457(c) solely for the purpose of calculating  the
    amount of the registration fee.
 
    THE  REGISTRANT HEREBY  AMENDS THIS REGISTRATION  STATEMENT ON  SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS  REGISTRATION
STATEMENT  SHALL THEREAFTER BECOME EFFECTIVE IN  ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT  OF 1933, AS  AMENDED, OR UNTIL  THIS REGISTRATION  STATEMENT
SHALL  BECOME EFFECTIVE ON SUCH DATE  AS THE SECURITIES AND EXCHANGE COMMISSION,
ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE
 
    This  Registration Statement contains two forms of prospectus: (i) one to be
used in connection with an offering in  the United States and Canada (the  "U.S.
Prospectus")  and (ii)  the other  to be  used in  connection with  a concurrent
offering  outside  of   the  United  States   and  Canada  (the   "International
Prospectus"). The U.S. Prospectus and the International Prospectus are identical
in all respects except for the front cover page of the International Prospectus,
which  is included  herein after the  final page  of the U.S.  Prospectus and is
labeled "Alternate Page for  International Prospectus." Final  forms of each  of
the Prospectuses will be filed with the Securities and Exchange Commission under
Rule 424(b).
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
 PROSPECTUS (SUBJECT TO COMPLETION)
 ISSUED JANUARY 24, 1997
                                2,600,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
                             ---------------------
 
OF THE 2,600,000  SHARES OF  COMMON STOCK  OFFERED, 2,080,000  SHARES ARE  BEING
OFFERED INITIALLY IN THE UNITED STATES AND CANADA BY THE U.S. UNDERWRITERS AND
  520,000 SHARES ARE BEING OFFERED INITIALLY OUTSIDE OF THE UNITED STATES AND
    CANADA  BY THE  INTERNATIONAL UNDERWRITERS.  SEE "UNDERWRITERS."  OF THE
    2,080,000  SHARES  OF   COMMON  STOCK   BEING  OFFERED   BY  THE   U.S.
     UNDERWRITERS,  160,000  SHARES  ARE  BEING  SOLD  BY  THE  COMPANY AND
     1,920,000 SHARES ARE  BEING SOLD  BY THE  SELLING STOCKHOLDERS.  SEE
       "PRINCIPAL  AND  SELLING  STOCKHOLDERS."  THE  COMPANY  WILL NOT
         RECEIVE ANY OF  THE PROCEEDS FROM  THE SALE OF  SHARES BY  THE
         SELLING STOCKHOLDERS. THE COMPANY'S COMMON STOCK IS LISTED ON
          THE  NASDAQ NATIONAL  MARKET UNDER  THE SYMBOL  "AFCI." ON
            JANUARY 23,  1997, THE  LAST SALE  PRICE OF  THE  COMMON
            STOCK  AS REPORTED ON THE  NASDAQ  NATIONAL MARKET WAS
              $53 1/4  PER  SHARE.  SEE  "PRICE  RANGE  OF  COMMON
                                    STOCK."
 
                           --------------------------
 
         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 $  A SHARE
                            ------------------------
 
<TABLE>
<CAPTION>
                                                             UNDERWRITING                            PROCEEDS TO
                                           PRICE TO         DISCOUNTS AND        PROCEEDS TO           SELLING
                                            PUBLIC         COMMISSIONS (1)       COMPANY (2)         STOCKHOLDERS
                                      ------------------  ------------------  ------------------  ------------------
<S>                                   <C>                 <C>                 <C>                 <C>
PER SHARE...........................          $                   $                   $                   $
TOTAL (3)...........................          $                   $                   $                   $
</TABLE>
 
- ------------
    (1) THE COMPANY AND  THE SELLING STOCKHOLDERS HAVE  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 $450,000.
 
    (3)  CERTAIN SELLING STOCKHOLDERS  HAVE GRANTED TO  THE U.S. UNDERWRITERS AN
       OPTION, EXERCISABLE WITHIN 30 DAYS OF THE DATE HEREOF, TO PURCHASE UP  TO
       AN  AGGREGATE OF  390,000 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 SELLING STOCKHOLDERS WILL BE $            , $
       AND $           , 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             , 1997 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
 
           , 1997
<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.
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                       PAGE
                                                                                                                     ---------
<S>                                                                                                                  <C>
Prospectus Summary.................................................................................................          3
Risk Factors.......................................................................................................          4
The Company........................................................................................................         13
Use of Proceeds....................................................................................................         14
Dividend Policy....................................................................................................         14
Price Range of Common Stock........................................................................................         14
Capitalization.....................................................................................................         15
Selected Consolidated Financial Data...............................................................................         16
Management's Discussion and Analysis of Financial Condition and Results of Operations..............................         17
Business...........................................................................................................         24
Management.........................................................................................................         38
Certain Transactions...............................................................................................         48
Principal and Selling Stockholders.................................................................................         51
Description of Capital Stock.......................................................................................         54
Shares Eligible for Future Sale....................................................................................         57
Underwriters.......................................................................................................         59
Legal Matters......................................................................................................         62
Experts............................................................................................................         62
Additional Information.............................................................................................         62
Glossary of Terms..................................................................................................         63
Index to Financial Statements......................................................................................        F-l
</TABLE>
 
                            ------------------------
 
    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 ASSUMES  NO
EXERCISE  OF THE UNDERWRITERS' OVER-ALLOTMENT OPTION.  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 FOURTH FISCAL QUARTER AND FISCAL
YEAR AS ENDING ON DECEMBER 31.
                            ------------------------
 
    SEE "GLOSSARY OF  TERMS" COMMENCING ON  PAGE 63 FOR  DEFINITIONS OF  VARIOUS
ACRONYMS AND TECHNICAL TERMS USED IN THIS PROSPECTUS.
                            ------------------------
 
    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.
                            ------------------------
 
    IN CONNECTION WITH THIS OFFERING, CERTAIN UNDERWRITERS MAY ENGAGE IN PASSIVE
MARKET MAKING TRANSACTIONS  IN THE  COMMON STOCK OF  THE COMPANY  ON THE  NASDAQ
NATIONAL MARKET IN ACCORDANCE WITH RULE 10B-6A UNDER THE SECURITIES EXCHANGE ACT
OF 1934. SEE "UNDERWRITERS."
 
                                       2
<PAGE>
                               PROSPECTUS SUMMARY
 
    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.
 
                                  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  analog services such as plain  old telephone service, universal voice
grade service and  analog switched data  service, and digital  services such  as
high  speed digital  data service,  ISDN and  asynchronous and  synchronous data
channel services.
 
    The UMC  system  has  been  sold to  more  than  450  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 and BellSouth.  The
Company  has  also sold  the UMC  system  to telephone  companies in  Hong Kong,
France,  Brazil,  Canada,  China,  Mexico,  the  Netherlands  Antilles  and  the
Dominican Republic. The UMC system is distributed and serviced worldwide through
its  direct sales  force in  the domestic  market and  through its  direct sales
force, distributors and agents in international markets.
 
RECENT DEVELOPMENTS
 
    Revenues for the  quarter ended December  31, 1996 increased  112% to  $41.4
million  from $19.5 million  for the quarter ended  December 31, 1995. Operating
income in the quarter increased 218% to  $6.2 million from $1.9 million and  net
income  in the quarter increased  258% to $5.6 million  from $1.6 million in the
quarter ended December 31, 1995. The Company continued to expand its penetration
of international markets, completing sales to its first customers in Brazil  and
increasing  sales in China. The Company  has begun working with Flextronics, one
of the  Company's contract  manufacturers, to  manufacture UMC  assemblies at  a
Flextronics facility in China.
 
                                  THE OFFERING
 
<TABLE>
<S>                                                   <C>        <C>
U.S. Offering.......................................  2,080,000  Shares
International Offering..............................    520,000  Shares
    Total...........................................  2,600,000  Shares (including 200,000 Shares by the Company and
                                                                 2,400,000 Shares by the Selling Stockholders)
Common Stock to be outstanding after the offering...  33,157,535 Shares (1)
Use of proceeds.....................................  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>
                                                                                       YEAR ENDED DECEMBER 31,
                                                                              ------------------------------------------
                                                                                1993       1994       1995     1996 (2)
                                                                              ---------  ---------  ---------  ---------
<S>                                                                           <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues....................................................................  $     620  $  18,802  $  54,287  $ 130,193
Gross profit (loss).........................................................     (1,954)     4,678     20,818     56,243
Operating income (loss).....................................................     (7,291)    (7,791)     3,805      1,695
Net income (loss)...........................................................     (7,291)    (7,765)     2,341      7,237
Pro forma net income per share (3)..........................................                        $    0.09  $    0.21
Shares used in per share computations (3)...................................                           27,329     34,282
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                             DECEMBER 31, 1996
                                                                                         --------------------------
                                                                                          ACTUAL    AS ADJUSTED (4)
                                                                                         ---------  ---------------
<S>                                                                                      <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents and marketable securities....................................  $ 108,430     $ 118,456
Working capital........................................................................    145,338       155,364
Total assets...........................................................................    175,679       185,705
Total stockholders' equity.............................................................    158,023       168,049
</TABLE>
 
- ------------
(1)  Based on the number  of shares outstanding as of  December 31, 1996 and the
    number of shares issuable upon the  exercise of warrants by certain  Selling
    Stockholders  in connection with this offering. Excludes 7,008,142 shares of
    Common Stock reserved for issuance  under the Company's stock option  plans,
    under  which options  to purchase  4,313,544 shares  were outstanding  as of
    December 31,  1996, and  1,500,000 shares  reserved for  issuance under  the
    Company's  Employee Stock Purchase  Plan. Also excludes  2,265,848 shares of
    Common Stock  reserved for  issuance pursuant  to the  exercise of  warrants
    outstanding  as of December 31, 1996, after giving effect to the exercise of
    warrants to  acquire  307,928 shares  of  Common Stock  by  certain  Selling
    Stockholders to be sold in this offering. See "Management -- Stock Incentive
    Plan,"   "  --  Employee  Stock   Purchase  Plan,"  "Certain  Transactions,"
    "Principal and Selling Stockholders" and "Description of Capital Stock."
(2) Includes  a charge  of $15.8  million to  reflect a  cash payment  of  $10.1
    million  and  the  issuance  of  725,787  shares  of  Common  Stock  to  DSC
    Communications Corporation  in  settlement of  outstanding  litigation.  See
    "Business  -- Legal Proceedings." Without  this charge, operating income for
    the year ended December 31, 1996 would have been $17.5 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 per share.
 
(4)  As adjusted to  reflect the sale of  200,000 shares of  Common Stock by the
    Company at an  assumed public  offering price of  $53 1/4  per share  (after
    deducting  estimated  underwriting discounts  and commissions  and estimated
    offering expenses) and the issuance of  307,928 shares of Common Stock  upon
    exercise  of certain outstanding warrants at an exercise price of $1.165 per
    share. The  shares issued  on exercise  of  such warrants  will be  sold  by
    certain  Selling Stockholders in this offering. The Company will receive the
    exercise price of such warrants, but will not receive the proceeds from  the
    sale  of the underlying  shares of Common  Stock. See "Use  of Proceeds" and
    "Principal and Selling Stockholders."
 
                                       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 $6.2  million as  of
December  31, 1996.  Although the Company  achieved profitability  for the years
ended December 31, 1995  and 1996, 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 mix between domestic
and international sales; the customer mix;  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; and unit volume.
 
    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  a portion  of the  UMC system  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
 
                                       4
<PAGE>
December 31. In particular, the Company currently believes that revenues in  the
quarter  ended March 31,  1997 may be  lower than revenues  in the quarter ended
December 31,  1996.  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 and  feature enhancements 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 feature enhancements,  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
 
                                       5
<PAGE>
released. The Company has in the past discovered software errors in certain  UMC
system  installations.  There  can  be no  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
 
                                       6
<PAGE>
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, 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.  In June  1996, the
Company 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
 
                                       7
<PAGE>
limited   experience  in  the  management   of  rapidly  growing  companies.  To
effectively manage the recent 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. In
connection with the Company's recent growth, management has begun evaluation  of
new  management and  accounting systems and  intends to  begin implementing such
systems in 1997. There can be no  assurance that the Company will complete  such
evaluation or implementation on a timely basis. 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  8.1% of  the  Company's
revenues  in  1995 and  1996, respectively,  were derived  from sales  to ALLTEL
Supply, Inc. In 1995  and 1996, the Company's  five largest customers  accounted
for  approximately 37% and 28% of revenues, respectively. 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 20.8%  of the Company's total  revenues in 1995 and  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
 
                                       8
<PAGE>
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.
 
    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
 
                                       9
<PAGE>
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.
 
    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 has initiated the formal process of applying
for ISO-9001  certification and  expects to  complete the  audit process  during
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
expects  to  use  the net  proceeds  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 28.5%  of the  Company's  outstanding Common  Stock. 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
 
                                       10
<PAGE>
Delaware law which could have the effect of delaying, deterring or preventing  a
change  in control of the Company, including Section 203 of the 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."
 
    POSSIBLE  VOLATILITY OF STOCK PRICE.  The  trading price of the Common Stock
has fluctuated  significantly since  the Company's  initial public  offering  in
October  1996 and could be subject to  significant fluctuations in the future 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.
 
    BENEFITS OF THE  OFFERING TO  SELLING STOCKHOLDERS.   Existing  stockholders
will  be selling 2,400,000 shares of  the Common Stock offered hereby (2,790,000
shares if the Underwriter's over-allotment  option is exercised). The price  per
share  paid by the  Selling Stockholders for  their shares is  a fraction of the
proposed public offering price for the Common Stock offered hereby. See "Certain
Transactions."
 
    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  by  the
following  lock-up agreements  (collectively, the "Lock-Up  Agreements"): (i) in
connection with the Company's initial  public offering, the Company's  officers,
directors  and certain stockholders agreed (the  "IPO Lock-Up Agreement") not to
sell or otherwise dispose of any of their shares for 180 days following the date
of the Company's  initial public offering  without the prior  consent of  Morgan
Stanley  &  Co. Incorporated;  and (ii)  in connection  with this  offering, the
Company's executive  officers,  directors  and  the  Selling  Stockholders  have
entered  into agreements with Morgan Stanley  & Co. Incorporated (the "Follow-On
Lock-Up Agreements")  pursuant to  which  such holders  agreed  not to  sell  or
otherwise  dispose of any  of their shares  for 90 days  following completion of
this offering.  Morgan Stanley  & Co.  Incorporated may,  however, in  its  sole
discretion  at any time  and without notice,  release all or  any portion of the
securities subject to Lock-Up Agreements. Upon completion of this offering,  the
Company  will  have  outstanding 33,157,535  shares  of Common  Stock.  Of these
shares: 7,793,750 shares (including the  5,175,000 shares sold in the  Company's
initial  public offering and the 2,600,000 shares sold in this offering) will be
available for immediate sale; 10,547,936 shares will become eligible for sale on
March 30, 1997 upon  expiration of the IPO  Lock-Up Agreements pursuant to  Rule
701  or  Rule  144  under  the  Securities  Act  ("Rule  701"  and  "Rule  144,"
respectively) (subject in certain cases to the volume limitations of Rule  144);
13,346  shares will become  eligible for sale  pursuant to Rule  144 (subject in
 
                                       11
<PAGE>
certain cases to the  applicable Rule 144 volume  limitations) at various  dates
between  March  30,  1997  and  the expiration  date  of  the  Follow-On Lock-Up
Agreements  upon  expiration  of  the  applicable  Rule  144  holding   periods;
11,499,943  shares will become eligible for sale 90 days after the completion of
this offering upon expiration  of the Follow-On  Lock-Up Agreements pursuant  to
Rule 701 or Rule 144 (subject in certain cases to the volume limitations of Rule
144);  and the remaining 3,302,560 shares will become eligible for sale pursuant
to Rule  144  (subject  in certain  cases  to  the applicable  Rule  144  volume
limitations)  at  various dates  following expiration  of the  Follow-On Lock-Up
Agreements. In addition, as  of December 31, 1996,  the Company had  outstanding
warrants  to purchase  an aggregate of  2,265,848 shares of  Common Stock (after
giving effect  to  the  exercise  of warrants  to  purchase  307,928  shares  in
connection  with this offering). These warrants contain net exercise provisions.
Accordingly, any  shares issued  upon net  exercise will  be eligible  for  sale
immediately  upon expiration of any lock-up  agreements to which such shares are
subject pursuant to Rule 144. In addition, the Company has filed a  registration
statement  on  Form  S-8  with  the  Securities  and  Exchange  Commission  (the
"Commission") registering 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, 4,313,544 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 as follows: 3,290,108 shares
on March 30, 1997 and  the remaining 1,023,436 shares 90  days from the date  of
this Prospectus. The 1,500,000 shares reserved under the Employee Stock Purchase
Plan  will  be eligible  for sale  upon  issuance. In  addition, the  holders of
approximately 19,368,927 shares  of Common  Stock outstanding  or issuable  upon
exercise  of outstanding warrants 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 analog services such as plain old telephone
service ("POTS"), universal voice grade service ("UVG") and analog switched data
service, and digital services such as high speed digital data service, ISDN  and
asynchronous  and synchronous data channel ("ADU" and "SDU") services. 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  450  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 and BellSouth.  The
Company  has  also sold  the UMC  system  to telephone  companies in  Hong Kong,
France,  Brazil,  Canada,  China,  Mexico,  the  Netherlands  Antilles  and  the
Dominican Republic. The UMC system is distributed and serviced worldwide through
its  direct sales  force in  the domestic  market and  through its  direct sales
force, 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.
 
RECENT DEVELOPMENTS
 
    Revenues for the  quarter ended December  31, 1996 increased  112% to  $41.4
million  from $19.5 million  for the quarter ended  December 31, 1995. Operating
income in the quarter increased 218% to  $6.2 million from $1.9 million and  net
income  in the quarter increased  258% to $5.6 million  from $1.6 million in the
quarter ended December 31, 1995. The Company continued to expand its penetration
of international markets, completing sales to its first customers in Brazil  and
increasing  sales  in  China. The  Company  has begun  working  with Flextronics
International,   Ltd.   ("Flextronics"),   one   of   the   Company's   contract
manufacturers, to manufacture UMC assemblies at a Flextronics facility in China.
 
                                       13
<PAGE>
                                USE OF PROCEEDS
 
    The  net proceeds  to the  Company from  the sale  of the  200,000 shares of
Common Stock  offered by  the Company  hereby and  the exercise  of warrants  to
purchase  307,928 shares of Common Stock by certain Selling Stockholders will be
approximately $10.0 million,  assuming a public  offering price of  $53 1/4  per
share  and after deducting estimated  underwriting discounts and commissions and
estimated offering expenses. The Company will not receive any proceeds from  the
sale  of Shares by the Selling Stockholders.  The Company expects to use the net
proceeds received by  it from the  Shares sold by  it in this  offering and  the
exercise  of the warrants by certain  Selling Stockholders 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.
 
                          PRICE RANGE OF COMMON STOCK
 
    The  Company's Common Stock  has traded on the  Nasdaq National Market under
the symbol "AFCI" since October 1,  1996. The Company's initial public  offering
price  was $25.00  per share.  The following table  sets forth,  for the periods
indicated, the high and low closing  sale prices for the Company's Common  Stock
as reported by the Nasdaq National Market:
 
<TABLE>
<CAPTION>
                                                                                 HIGH        LOW
                                                                               ---------  ---------
<S>                                                                            <C>        <C>
Year Ending December 31, 1997:
  First Quarter (through January 23, 1997)...................................  $  55 5/8  $      47
Year Ending December 31, 1996:
  Fourth Quarter (beginning October 1, 1996).................................     61 1/4     44 1/2
</TABLE>
 
    On January 23, 1997, the last reported sale price of the Common Stock on the
Nasdaq National Market was $53 1/4 per share. As of December 31, 1996 there were
approximately 211 holders of record of the Common Stock.
 
                                       14
<PAGE>
                                 CAPITALIZATION
 
    The  following table  sets forth  the capitalization  of the  Company (i) at
December 31,  1996, and  (ii) as  adjusted to  give effect  to the  sale by  the
Company of 200,000 shares of Common Stock at an assumed public offering price of
$53  1/4  per  share  (after  deducting  estimated  underwriting  discounts  and
commissions and estimated  offering expenses)  and the exercise  of warrants  to
purchase  307,928 shares  of Common  Stock at  an exercise  price of  $1.165 per
share.
 
<TABLE>
<CAPTION>
                                                                                              DECEMBER 31, 1996
                                                                                           -----------------------
                                                                                             ACTUAL    AS ADJUSTED
                                                                                           ----------  -----------
                                                                                            (IN THOUSANDS, EXCEPT
                                                                                                 SHARE DATA)
<S>                                                                                        <C>         <C>
Stockholders' equity (deficit):
  Preferred Stock, $.01 par value; 5,000,000 shares authorized, no shares issued and
   outstanding...........................................................................  $   --       $  --
  Common Stock, $.01 par value; 100,000,000 shares authorized, 32,649,607 shares issued
   and outstanding, actual; 33,157,535 shares issued and outstanding, as adjusted (1)....         326         332
Additional paid-in capital...............................................................     164,002     174,022
Notes receivable from stockholders.......................................................        (151)       (151)
Accumulated deficit......................................................................      (6,154)     (6,154)
                                                                                           ----------  -----------
  Total stockholders' equity.............................................................     158,023     168,049
                                                                                           ----------  -----------
      Total capitalization...............................................................  $  158,023   $ 168,049
                                                                                           ----------  -----------
                                                                                           ----------  -----------
</TABLE>
 
- ---------
(1) Excludes 7,008,142 shares  of Common Stock reserved  for issuance under  the
    Company's  stock  option plans,  under which  options to  purchase 4,313,544
    shares were  outstanding  as of  December  31, 1996,  and  1,500,000  shares
    reserved for issuance under the Company's Employee Stock Purchase Plan. Also
    excludes  2,265,848 shares of Common Stock reserved for issuance pursuant to
    the exercise of warrants  outstanding as of December  31, 1996 after  giving
    effect  to the issuance of 307,928 shares  of Common Stock upon the exercise
    of  warrants  by  certain  Selling  Stockholders  in  connection  with  this
    offering.  See ``Management --  Stock Incentive Plan,"  `` -- Employee Stock
    Purchase Plan," ``Certain Transactions" and ``Description of Capital Stock."
 
                                       15
<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, 1994,  1995 and  1996 and  consolidated balance  sheet data  as of
December 31, 1995  and 1996 are  derived from financial  statements, which  have
been  audited by KPMG Peat Marwick LLP, independent auditors, included elsewhere
in this Prospectus. The consolidated statement  of operations data for the  year
ended  December 31, 1993 and the consolidated  balance sheet data as of December
31, 1993  and 1994  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. These historical results are not necessarily indicative of
the results to be expected in the future.
 
<TABLE>
<CAPTION>
                                                                  INCEPTION (MAY
                                                                   29, 1992) TO
                                                                   DECEMBER 31,             YEAR ENDED DECEMBER 31,
                                                                  ---------------  ------------------------------------------
                                                                       1992          1993       1994       1995     1996 (1)
                                                                  ---------------  ---------  ---------  ---------  ---------
                                                                             (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                               <C>              <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues........................................................     $     275     $     620  $  18,802  $  54,287  $ 130,193
Cost of revenues................................................            38         2,574     14,124     33,469     73,950
                                                                         -----     ---------  ---------  ---------  ---------
  Gross profit (loss)...........................................           237        (1,954)     4,678     20,818     56,243
                                                                         -----     ---------  ---------  ---------  ---------
Operating expenses:
  Research and development......................................           622         2,044      2,867      5,730     14,413
  Selling, general and administrative...........................           266         2,509      5,051      9,660     21,188
  DSC litigation costs..........................................        --               784      4,551      1,623     18,947
                                                                         -----     ---------  ---------  ---------  ---------
    Total operating expenses....................................           888         5,337     12,469     17,013     54,548
                                                                         -----     ---------  ---------  ---------  ---------
Operating income (loss).........................................          (651)       (7,291)    (7,791)     3,805      1,695
Gain on dissolution (equity in loss) of joint venture, net......        --            --         --         (1,516)     1,516
Other income (expense), net.....................................           (25)       --             26        149        872
                                                                         -----     ---------  ---------  ---------  ---------
Income (loss) before income taxes...............................          (676)       (7,291)    (7,765)     2,438      4,083
Income taxes (benefit)..........................................        --            --         --             97     (3,154)
                                                                         -----     ---------  ---------  ---------  ---------
Net income (loss)...............................................     $    (676)    $  (7,291) $  (7,765) $   2,341  $   7,237
                                                                         -----     ---------  ---------  ---------  ---------
                                                                         -----     ---------  ---------  ---------  ---------
Pro forma net income per share (2)..............................                                         $    0.09  $    0.21
                                                                                                         ---------  ---------
                                                                                                         ---------  ---------
Shares used in per share computations (2).......................                                            27,329     34,282
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                         DECEMBER 31,
                                                                  -----------------------------------------------------------
                                                                       1992          1993       1994       1995       1996
                                                                  ---------------  ---------  ---------  ---------  ---------
                                                                                        (IN THOUSANDS)
<S>                                                               <C>              <C>        <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash and cash equivalents and marketable securities.............     $  --         $     450  $   3,858  $  11,118  $ 108,430
Working capital.................................................            77           466      6,809     18,770    145,338
Total assets....................................................           458         3,787     14,884     36,680    175,679
Redeemable convertible preferred stock..........................        --             9,152     23,546     37,777     --
Total stockholders' equity (deficit)............................          (661)       (7,952)   (15,706)   (15,765)   158,023
</TABLE>
 
- ------------
(1)  Includes  a charge  of $15.8  million to  reflect a  cash payment  of $10.1
    million and  the  issuance of  725,787  shares of  Common  Stock to  DSC  in
    settlement  of outstanding litigation. See ``Business -- Legal Proceedings."
    Without this charge, operating income for  the year ended December 31,  1996
    would have been $17.5 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 per share.
 
                                       16
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
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 $6.2 million as
of December 31, 1996. Although the Company achieved profitability for the  years
ended  December 31, 1995  and 1996, 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 its direct sales force, 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
and of a China-based joint venture, 60% of which was owned by the subsidiary and
40% of which was 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 1996. In August 1996,
the Company and the  China-based joint venture partner  agreed to liquidate  the
joint  venture. A charge for  liquidation costs of $383,000  was recorded in the
second half of  1996. The  liquidation is expected  to be  completed during  the
first  quarter of  1997 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.
 
    The  Company's customers  normally install  a portion  of the  UMC system 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. In  particular,  the  Company currently
believes that revenues in  the quarter ended  March 31, 1997  may be lower  than
revenues  in the quarter  ended December 31,  1996. See "Management's Discussion
and Analysis  of Financial  Condition  and Results  of Operations  --  Quarterly
Results of Operations."
 
                                       17
<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>
                                                                                          YEAR ENDED DECEMBER 31,
                                                                                     ---------------------------------
                                                                                       1994       1995       1996(1)
                                                                                     ---------  ---------  -----------
 
<S>                                                                                  <C>        <C>        <C>
Revenues...........................................................................      100.0%     100.0%      100.0%
Cost of revenues...................................................................       75.1       61.7        56.8
                                                                                     ---------  ---------       -----
  Gross profit.....................................................................       24.9       38.3        43.2
                                                                                     ---------  ---------       -----
Operating expenses:
  Research and development.........................................................       15.2       10.6        11.1
  Selling, general and administrative..............................................       26.9       17.8        16.3
  DSC litigation costs.............................................................       24.2        3.0        14.5
                                                                                     ---------  ---------       -----
    Total operating expenses.......................................................       66.3       31.3        41.9
                                                                                     ---------  ---------       -----
Operating income (loss)............................................................      (41.4)       7.0         1.3
Gain on dissolution (equity in loss) of joint venture, net.........................     --           (2.8)        1.2
Other income, net..................................................................        0.1        0.3         0.6
                                                                                     ---------  ---------       -----
Income (loss) before income taxes..................................................      (41.3)       4.5         3.1
Income taxes (benefit).............................................................     --            0.2        (2.4)
                                                                                     ---------  ---------       -----
Net income (loss)..................................................................      (41.3)%       4.3%        5.5%
                                                                                     ---------  ---------       -----
                                                                                     ---------  ---------       -----
</TABLE>
 
- ------------
(1) Includes  a charge  of $15.8  million to  reflect a  cash payment  of  $10.1
    million  and  the issuance  of  725,787 shares  of  Common Stock  to  DSC in
    settlement of  outstanding litigation.  See "Note  10 of  the Notes  to  the
    Consolidated Financial Statements." Without this charge, operating income as
    a  percentage of revenues  for the year  ended December 31,  1996 would have
    been 13.4%.
 
1996 COMPARED WITH 1995
 
    REVENUES.  Revenues increased  139.8% from $54.3 million  in 1995 to  $130.2
million  for 1996. International revenues increased  276.7% from $7.2 million in
1995 to $27.1 million in 1996 and represented 13.2% and 20.8% of total  revenues
in  1995 and 1996, respectively. No single customer accounted for 10% or more of
revenues in 1996.  ALLTEL Supply, Inc.  an affiliate of  ALLTEL, an  independent
domestic  telephone company, accounted  for 15.7% of total  revenues in 1995. No
other single customer accounted  for 10% or more  of revenues in 1995.  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.
 
    International  and domestic revenues  increased as a  result of expansion of
the Company's customer  base and  the introduction of  new features  in the  UMC
system. The increase in international revenues was partially due to higher sales
levels  in China resulting from  the acquisition in April  1996 of the shares of
the Company's Hong  Kong-based subsidiary  not previously owned  by the  Company
(which  resulted in  the consolidation for  financial reporting  purposes of the
Company's China-based operations) as well as increased levels of sales  activity
in  China. The increase in international revenues was also attributable to sales
to France Telecom, Hong Kong Telecom and Promon Electronics (Brazil).
 
    GROSS PROFIT.    Gross  profit  is comprised  of  revenues  less  materials,
manufacturing  and  warranty costs.  Gross  profit increased  170.2%  from $20.8
million in  1995 to  $56.2 million  in 1996.  As a  percent of  revenues,  gross
profits  were 38.3% in 1995 and 43.2%  in 1996. The improvement in gross margins
was  attributable  to  greater  efficiencies  in  purchasing  and  manufacturing
activities  resulting from higher unit volumes. Also, the Company realized lower
product costs as a result of engineering design improvements. Gross margins were
negatively impacted  in 1996  by the  increased level  of sales  in China  which
generally  have a lower gross margin due  to the higher cost of distribution and
price sensitivity as compared with other markets. In the
 
                                       18
<PAGE>
future, gross margins may fluctuate due to a wide variety of factors, including:
the mix between domestic and international  sales; customer mix; 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; and unit volume.
 
    RESEARCH AND DEVELOPMENT.   Expenses  relating to  research and  development
activities  increased 151.5% from $5.7 million in 1995 to $14.4 million in 1996.
As a percentage of  revenues, research and  development expenses increased  from
10.6% for 1995 to 11.1% in 1996. The increase resulted primarily from the hiring
of  additional personnel and  the increased use of  outside services for certain
development efforts  during  1996.  The  number of  employees  in  research  and
development  increased from 63 at December 31, 1995 to 124 at December 31, 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 119.3% from $9.7 million in 1995 to $21.2 million in 1996. As
a percentage of revenues, selling, general and administrative expenses decreased
from 17.8% in  1995 to  16.3% in  1996. 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  and  outside
international  sales representatives as  a result of  higher revenue levels. The
Company also increased  its advertising  and trade show  participation in  1996.
General  and administrative expenses  increased as a result  of the expansion of
the administrative  staff  in  1996,  the legal  costs  incurred  for  the  ITRI
litigation and the additional costs associated with being a public company.
 
    DSC  LITIGATION COSTS.  Litigation expenses  incurred in connection with the
DSC litigation increased from $1.6 million  for 1995 to $18.9 million for  1996.
The  increase is primarily attributable to  the $15.8 million charge recorded in
the second quarter of 1996  in connection with the  final settlement of the  DSC
litigation. See Note 10 of Notes to the Consolidated Financial Statements.
 
    GAIN  ON DISSOLUTION (EQUITY  IN LOSS) OF  JOINT VENTURE, NET.   In 1996 and
1995, 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 1995 and  the first quarter  of 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  sheet as  of December  31, 1995. On
December 23, 1996  the Company  and the joint  venture partner  entered into  an
agreement  to terminate the  joint venture. In  connection with the dissolution,
the joint venture partner  reimbursed the Company $1,683,000  for all loans  and
advances  made by the Company to date.  The reimbursement was recorded as a gain
in the fourth quarter of 1996 and is reflected in gain on dissolution (equity in
loss) of joint venture, net.
 
    OTHER INCOME, NET.   Net  other income increased  from $149,000  in 1995  to
$872,000  in 1996 and consisted primarily  of interest income from the Company's
cash and investments in  marketable securities, net of  interest expense on  the
Company's bank line of credit and short-term bank loan.
 
    INCOME  TAXES (BENEFIT).  An income tax benefit of $3.2 million was recorded
for 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 December 31, 1996, the Company has recorded no valuation allowance
against its  deferred tax  assets because  management believes  such assets  are
realizable. For the second half of 1996, the Company recorded income taxes at an
effective rate that approximates the combined federal and state statutory rates.
 
                                       19
<PAGE>
1995 COMPARED WITH 1994
 
    REVENUES.   Revenues were $18.8 million and  $54.3 million in 1994 and 1995,
respectively. 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, an 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 from $4.7  million in 1994 to
$20.8 million in 1995, respectively, and  gross margins increased from 24.9%  in
1994 to 38.3% in 1995. Gross margins improved in 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.
 
    RESEARCH  AND  DEVELOPMENT.   Research  and development  expenses  were $2.9
million and $5.7  million in  1994 and 1995,  respectively. As  a percentage  of
revenues,  research and  development expenses were  15.2% and 10.6%  in 1994 and
1995, respectively.  The  Company increased  its  engineering staff  to  support
continued  product development and cost reductions  during these periods from 38
to 63 employees  at December 31,  1994 and 1995,  respectively. The decrease  in
research  and development expenses as a percentage of revenues from 1994 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 $5.1 million and $9.7 million in 1994 and 1995, respectively. As a
percentage of revenues, selling, general and administrative expenses were  26.9%
and  17.8% in 1994 and 1995, respectively, with the decrease being the result of
the increased revenue base. The increases in absolute dollars reflects the build
up 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  $4.6 million  and  $1.6
million  in 1994 and  1995, respectively. DSC litigation  costs in 1994 included
reserves for a  possible settlement of  $2.0 million.  See Note 10  of Notes  to
Consolidated Financial Statements.
 
    GAIN  ON DISSOLUTION (EQUITY IN  LOSS) OF JOINT VENTURE,  NET.  During 1995,
the Company made  a loan of  $1.0 million and  other operating expense  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.  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 1994 and  advances
under the Company's bank line of credit in 1995.
 
    INCOME  TAXES.  Because  of operating losses sustained  in 1994, the Company
did not provide  for income taxes  in that year,  other than 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 7 of Notes to Consolidated Financial Statements.
 
                                       20
<PAGE>
QUARTERLY RESULTS OF OPERATIONS
 
    The  following tables present unaudited  quarterly financial information for
the four quarters of 1995 and 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,   SEPT. 30,  DEC. 31,
                                           1995        1995       1995       1995       1996     1996 (1)     1996       1996
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                 (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                     <C>          <C>        <C>        <C>        <C>        <C>        <C>        <C>
Revenues..............................   $   7,456   $  11,789  $  15,548  $  19,494  $  24,121  $  29,651  $  35,012  $  41,409
Cost of revenues......................       4,633       7,288      9,837     11,711     14,101     16,957     19,737     23,155
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Gross profit..........................       2,823       4,501      5,711      7,783     10,020     12,694     15,275     18,254
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Operating expenses:
  Research and development............       1,050       1,214      1,406      2,060      2,619      3,275      4,141      4,378
  Selling, general and
   administrative.....................       1,681       2,281      2,471      3,227      3,545      4,356      5,608      7,679
  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      9,749     12,057
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Operating income (loss)...............        (266)        614      1,510      1,947      3,165    (13,193)     5,526      6,197
Other income (expense):
  Gain on dissolution (equity in loss)
   of joint venture, net..............        (202)       (340)      (526)      (448)      (167)    --         --          1,683
  Other income (expense), net.........          26          15         (4)       112         84        (18)      (338)     1,144
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes.....        (442)        289        980      1,611      3,082    (13,211)     5,188      9,024
Income taxes (benefit)................      --               2         39         56        910     (9,498)     1,984      3,450
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Net income (loss).....................   $    (442)  $     287  $     941  $   1,555  $   2,172  $  (3,713) $   3,204  $   5,574
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
 
<CAPTION>
 
                                                                      AS A PERCENTAGE OF REVENUES
                                        ----------------------------------------------------------------------------------------
<S>                                     <C>          <C>        <C>        <C>        <C>        <C>        <C>        <C>
Revenues..............................       100.0%      100.0%     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       56.4       55.9
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Gross profit..........................        37.9        38.2       36.7       39.9       41.5       42.8       43.6       44.1
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Operating expenses:
  Research and development............        14.1        10.3        9.0       10.6       10.9       11.0       11.8       10.6
  Selling, general and
   administrative.....................        22.5        19.3       15.9       16.6       14.7       14.7       16.0       18.5
  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       27.8       29.1
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Operating income (loss)...............        (3.6)        5.2        9.7       10.0       13.1      (44.5)      15.8       15.0
Other income (expense):
  Gain on dissolution (equity in loss)
   of joint venture, net..............        (2.7)       (2.9)      (3.4)      (2.3)      (0.7)    --         --            4.1
  Other income (expense), net.........         0.3         0.1     --            0.6        0.3       (0.1)      (1.0)       2.7
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes.....        (5.9)        2.5        6.3        8.3       12.8      (44.6)      14.8       21.8
Income taxes (benefits)...............      --          --            0.3        0.3        3.8      (32.1)       5.6        8.3
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Net income (loss).....................        (5.9)%       2.5%       6.0%       8.0%       9.0%     (12.5)%       9.2%      13.5%
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                        -----------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
</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 $7.1 million paid in July and the issuance of 725,787 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%.
 
                                       21
<PAGE>
    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 mix  between
domestic  and  international sales;  the customer  mix; 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; and  unit
volume.
 
    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  development  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, the  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.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    The  components of the Company's capital resources and liquidity at December
31, 1995 and 1996 were as follows:
 
<TABLE>
<CAPTION>
                                                                              DECEMBER 31,
                                                                          --------------------
                                                                            1995       1996
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Cash and cash equivalents...............................................  $  11,118  $  24,942
Marketable securities...................................................     --         83,488
Non-debt working capital, excluding cash and cash equivalents and
 marketable securities..................................................      7,652     36,908
</TABLE>
 
    On October 1, 1996, the Company issued 5,175,000 shares of its common  stock
pursuant   to   an  underwritten   initial   public  offering   which  generated
approximately $118.1 million of net proceeds. These proceeds were used to reduce
debt of approximately $14.8 million and to provide resources for general working
capital purposes. The balance  was invested in  cash equivalents and  marketable
securities.
 
    Prior  to the Company's initial public  offering, the Company had funded its
operations 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. Upon  the
consummation   of  the  initial  public   offering,  all  shares  of  redeemable
convertible preferred stock were converted into a total of 18,717,463 shares  of
Common 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
 
                                       22
<PAGE>
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. On December 23, 1996,
the Company and the joint venture partner entered into an agreement to terminate
the partnership. In connection with  the dissolution, the joint venture  partner
reimbursed the Company $1,683,000 for all loans and advances made by the Company
to  date. The reimbursement was recorded as a gain in the fourth quarter of 1996
and is reflected in gain on dissolution  (equity in loss) of joint venture,  net
in the accompanying financial statements.
 
    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.
 
    In June 1996,  as part of  the DSC litigation  settlement, the Company  paid
$3.0  million in cash 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 had an interest rate of 5.75% and a $4.0 million
compensating balance requirement. The loan was  due in January 1997. In  October
1996,  the  Company repaid  the loan  with  the proceeds  of the  initial public
offering.  See  "Business  --  Legal  Proceedings"  and  Note  10  of  Notes  to
Consolidated Financial Statements.
 
    The  $6.2  million of  cash  used by  operating  activities during  1996 was
primarily the result of increases in receivables and inventory. Receivables were
higher by $21.4 million in 1996 because of increased revenues. The $5.7  million
growth in inventory is in support of the higher revenue levels.
 
    Investing  activities used $91.1 million of  cash during 1996, primarily due
to the investment of the proceeds  of the Company's initial public offering  and
due  to $8.4  million of  capital expenditures  offset by  the $1.5  million net
reimbursement from a joint venture. The  Company continues to invest in  capital
equipment to support employee growth and research and development activities.
 
    Financing  activities provided $111.2 million of cash in 1996. The Company's
initial public offering generated $118.1 million  of net proceeds. A portion  of
the  proceeds were used  to repay $7.7  million in outstanding  balances under a
line of credit  agreement and $7.1  million outstanding under  a six-month  term
loan  arrangement  with  a  bank.  The  Company  borrowed  under  the  term loan
arrangement to fund a portion of the DSC litigation settlement.
 
    The Company has a $12.0 million line of credit with a bank bearing  interest
at  prime  plus 0.5%.  The  line of  credit expired  on  November 15,  1996, but
automatically renews  for  successive thirty  day  periods until  terminated  by
written  agreement. The amount available to  the Company for borrowing under the
line is based upon the  balance of eligible 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 1996,  no borrowings  were  outstanding under  the bank  line.  At
December  31, 1996,  $1.6 million  was reserved  under the  line for  letters of
credit and foreign exchange contracts. The Company also has lease lines totaling
$5.2 million that were used to  purchase equipment and furniture. There were  no
amounts left available under the lease lines as of December 31, 1996.
 
    The  Company believes that its existing  cash and short-term investments and
available credit facilities will be adequate to support the Company's  financial
resource  needs, including  working capital  requirements, capital expenditures,
operating lease obligations and debt payments for the next twelve months.
 
                                       23
<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" COMMENCING ON PAGE 63  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
analog  services such as POTS, UVG and analog switched data service, and digital
services such as high speed digital data service, ISDN and ADU and SDU services.
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  450  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 and BellSouth. The
Company has  also sold  the UMC  system  to telephone  companies in  Hong  Kong,
France,  Brazil,  Canada,  China,  Mexico,  the  Netherlands  Antilles  and  the
Dominican Republic. The UMC system is distributed and serviced worldwide through
its direct  sales force  in the  domestic market  and through  its direct  sales
force,  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.
 
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<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  450
independent  telephone companies and penetrate  the balance of the approximately
1,300 independent  telephone  companies.  In  addition,  with  the  satisfactory
completion of a Bellcore technical audit, the Company is expanding 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
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
 
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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. For example, the Company is engaged in development
efforts  to  increase the  scalability  of the  UMC  system for  large line-size
markets.
 
    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 1996, UMC systems  with
capacities  of 120 and 240 lines of  POTS sold for average prices, including the
cabinet, of approximately $25,000 and $40,000, respectively.
 
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<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.
 
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<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, with the
satisfactory completion of a Bellcore technical audit, the Company is  expanding
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 450 independents have purchased the Company's products.
 
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<PAGE>
    The following table lists the domestic independent telephone companies  that
have  purchased at  least $200,000 of  equipment from the  Company since January
1996:
 
3 Rivers Telephone Co-op
Albany Mutual Telephone
Aliant Communications
ALLTEL
Anixter Brothers
Arvig Telephone
Atlantic Telephone Membership
BEK Communications Co-op
Ben Lomand Rural Telephone Co-op
Benkelman Telephone Company
Benton Cooperative Telephone Company
Big Bend Telephone
Blackfoot Telephone Co-op
Bledsoe Telephone Co-op
Blue Earth Valley Telephone Company
Bridgewater Telephone
Central Texas Telephone Co-op
Chibardun Telephone Co-op
Citizens Telephone
Classic Telephone
Clay County Rural Telephone
Coleman County Telephone Co-op
Commonwealth Telephone Company
Consolidated Telephone Company
Contoocook Valley Telephone
Copper Valley Telephone Company
Cross Telephone
Delta County Tele-Com
Delta Telephone Company
Dickey Rural Telephone
East Ottertail Telephone
Eastern Nebraska Telephone
Ellensburg Telephone
Evans Telephone Company
Farmers Telephone Co-op
Frontier Communications
Geneseo Telephone
Golden West Telecommunications
Granite State Telephone
GTE
Guadalupe Valley Telephone Co-op
Gulf Telephone Company
Hancock Rural Telephone
Harrisonville Telephone
Hill Country Telephone Co-op
Horry Telephone Co-op
Illinois Consolidated Telephone Company
JBN Telephone
Kerrville Telephone
Ketchikan Public Utilities
Lakedale Telephone
Logan Telephone Co-op
Mankato Citizens Telephone
Margaretville Telephone
Mid Rivers Telephone Co-op
Midplains Telephone
NE Missouri Rural Telephone
Nemont Telephone Co-op
North East North Central Telephone Co-op
North Pittsburgh Telephone
Northland Telephone
People's Rural Telephone Co-op
Perry-Spencer Telephone Co-op
Pioneer Telephone Association
Pioneer Telephone Co-op
Planters Telephone Co-op
Prairie Grove Telephone
PTI Communications
Pulaski-White Telephone
Range Telephone Company
RT Communications
Runestone Telephone Association
Rural Telephone Service
Sanborn Telephone Co-op
Shenandoah Telephone Company
Silver Star Telephone Company
Skyline Telephone
Smithville Telephone Company
Somerset Telephone Company
South Central Rural Telephone Co-op
Southwestern Telephone
St. Joseph Telecommunications
Standard Telephone Company
TDS Telecom
The Ponderosa Telephone
Triangle Telephone Co-op
Tricom
Twin Valley-Ulen Telephone
Uintah Basin Telephone
Valley Telephone Co-op
West Carolina Rural Telephone Co-op
West Central Telephone Association
Woodbury Telephone
 
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<PAGE>
    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    deployment.
Telecommunications companies in these markets demand flexible and cost-effective
systems.  The Company  has sold  UMC systems  to telephone  companies in Brazil,
China, Mexico, the Netherlands Antilles and the Dominican Republic.
 
    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.  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 seeking type approval 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
 
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service and network requirements. The UMC system completed a Bellcore  technical
audit,  and the Company intends  to submit new features  for Bellcore testing as
they are released. In  addition, the UMC system  is being initially deployed  by
Ameritech and is in laboratory or field trials at Pacific Bell and BellSouth.
 
    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 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 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 agreements with Tellabs in 1996 that changed the
relationship between  the  parties.  The  new  relationship  provides  AFC  with
royalties  and OEM revenues from  Tellabs on its sales  into its markets and, in
return, AFC works on  selected developments of the  UMC technology for  Tellabs'
markets  on  a  development  contract  basis.  AFC  retains  all  rights  in its
technology as well as the market rights previously defined.
 
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 December 31,
1996,  the  Company's  domestic  sales  organization  consisted  of  17   direct
salespersons,  a domestic sales vice president, and technical support personnel.
The Company has  sales personnel  located in  Pittsburgh, Minneapolis,  Atlanta,
Denver,  Dallas, Chicago, Seattle,  Orlando, Birmingham, Tulsa  and Santa Clara.
The Company also has  sales personnel dedicated  to specific customer  accounts,
such  as Ameritech, BellSouth, GTE and Pacific Bell. 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.
 
                                       31
<PAGE>
    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  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   development  efforts  are   focused  on   developing
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 1996, the Company's  research and development expenditures were
$5.7 million and $14.4 million, respectively, which represented 10.6% and 11.1%,
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  December  31,  1996,  the  Company's  research  and
development staff consisted of 124 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  final  assembly  and  test of
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  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
 
                                       32
<PAGE>
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 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.
 
                                       33
<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  ETSI. 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  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 has initiated the formal process of applying for ISO-9001
certification and expects to  complete the audit  process during 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 superior
to the Company's technology. In addition, the laws of many foreign countries  do
not protect the
 
                                       34
<PAGE>
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.
 
    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
 
                                       35
<PAGE>
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 parties conducted discovery with respect to the royalty and ASIC  supply
issues  during September  and October  1996. A  hearing on  ITRI's motion  for a
preliminary injunction to require  the Company to  continue supplying ASICs  and
ITRI's  motion to compel arbitration was held  on November 22, 1996. In an order
dated January 9,  1997, the  court stayed the  litigation and  granted the  ITRI
parties'  motion  to compel  arbitration. The  court has  promised, but  not yet
issued, an opinion explaining the nature and scope of its arbitration order, and
has issued no ruling on the motion for a preliminary injunction.
 
    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 an
aggregate of $10.1 million and
 
                                       36
<PAGE>
issued  725,787 shares of Common  Stock to DSC. In  addition, under the terms of
the Settlement Agreement, AFC  maintains all rights to  the UMC technology  free
and  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
Note  10 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 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 December 31,  1996, AFC had 425  full-time employees, including 82  in
marketing,  sales and support services, 124  in research and development, 159 in
operations and  60 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 165,000 square feet under leases expiring beginning in March 2005.
The Company believes its facilities are  adequate for its current needs and  for
its needs in the foreseeable future.
 
                                       37
<PAGE>
                                   MANAGEMENT
 
EXECUTIVE OFFICERS, KEY EMPLOYEES AND DIRECTORS
 
    The  executive officers,  key employees  and directors  of the  Company, and
their respective ages as of December 31, 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.................................          43   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.....................................          36   Vice President, Advanced Development
John Webley.....................................          38   Vice President, Advanced Development
David Arnold....................................          46   Vice President, Engineering Development
Michael Hatfield................................          34   Vice President, International and Product
                                                               Management
Peter Kilkus....................................          52   Vice President, Quality Assurance
Greg Steele.....................................          35   Vice President, Operations
OUTSIDE DIRECTORS
B.J. Cassin (1).................................          63   Director
Clifford H. Higgerson (1) (2)...................          57   Director
Brian Jackman (2)...............................          55   Director
Dan Rasdal (1)..................................          63   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,
 
                                       38
<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 February 1993, 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
 
                                       39
<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. From November 1994 to March 1995, Mr. Steele was the Company's Director of
Operations. 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.
 
    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 September 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 1991.
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  February 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. Mr.  Rasdal is also a director of
Celeritek, Inc., a semiconductor manufacturer.
 
    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 the  Company's Series  A  and
Series  B Preferred Stock of the Company  had 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
terminated upon closing of the initial  public offering of the Company's  Common
Stock on October 4, 1996.
 
    The  Company's certificate of incorporation  provides for a classified Board
of Directors composed of seven directors.  Accordingly, the terms of the  office
of the Board of Directors are 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
 
                                       40
<PAGE>
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 resignation  or removal, if any.
Carl Grivner and Clifford Higgerson have  been designated as Class I  directors.
B.J. Cassin and Brian Jackman have been designated as Class II directors. Donald
Green and Dan Rasdal have been designated as Class III directors. The Company is
continuing  to seek to add one additional  director to the Board of Directors in
the future. 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 do not receive any cash fees for their service on
the Board or any Board committee, but they are 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
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  has  obtained officer  and  director liability  insurance  with
respect to liabilities arising out of certain matters, including matters arising
under the Securities Act.
 
                                       41
<PAGE>
    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.
 
EXECUTIVE COMPENSATION
 
    SUMMARY  OF CASH AND OTHER COMPENSATION.  The following table sets forth the
compensation earned by the Company's Chief Executive Officer and the other  four
executive  officers of  the Company (the  ``Named Executive  Officers"), each of
whose aggregate compensation for the year ended December 31, 1996 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>            <C>
Donald Green ......................................       1996  $  275,000  $  138,903      184,902      $  --
 Chairman of the Board and Chief Executive Officer        1995     185,000     115,625       25,000         --
Carl J. Grivner (1) ...............................       1996     235,000     106,349       --             74,080(2)
 President and Chief Operating Officer                    1995     102,115      48,894      212,000         14,690(3)
Karen Godfrey .....................................       1996     105,000      25,077       --             --
 Corporate Controller and Assistant Secretary             1995     101,016      28,935       10,200         --
Glenn Lillich .....................................       1996     170,000      51,868       --             --
 Vice President, Domestic Sales and Marketing             1995     160,000      54,400       12,000         --
Dan E. Steimle ....................................       1996     170,000      51,868       --             --
 Vice President, Chief Financial Officer, Treasurer       1995     160,000      54,400       12,000         --
 and Secretary
</TABLE>
 
- ---------
(1) Mr. Grivner joined the Company in July 1995.
 
(2)  Represents  $34,377  in  relocation  expenses  paid  by  the  Company   and
    forgiveness  of $39,703 of principal  and interest on a  note payable to the
    Company. See "Certain Transactions."
 
(3) Represents relocation expenses paid by the Company.
 
                                       42
<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 1996. No  stock appreciation rights were granted  to
the Named Executive Officers during such year.
 
<TABLE>
<CAPTION>
                                                 INDIVIDUAL GRANTS (1)
                                --------------------------------------------------------  POTENTIAL REALIZABLE VALUE
                                 NUMBER OF                                                AT ASSUMED ANNUAL RATES OF
                                SECURITIES     PERCENT OF                                  STOCK 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..................     184,902           17.1%      $   12.50       6/25/06   $  1,453,548  $  3,683,577
Carl J. Grivner...............      --             --              --            --            --            --
Karen Godfrey.................      --             --              --            --            --            --
Glenn Lillich.................      --             --              --            --            --            --
Dan E. Steimle................      --             --              --            --            --            --
</TABLE>
 
- ---------
(1)  The option shown in the table 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.
    The  shares vest in successive equal  monthly installments over 24 months of
    service, measured  from  the date  of  grant.  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.
 
    OPTION  EXERCISES  AND HOLDINGS.   The  following  table sets  forth certain
information with respect to the Named Executive Officers concerning their option
exercises during 1996 and their option holdings as of December 27, 1996. None of
the Named Executive Officers  held any stock appreciation  rights at the end  of
that fiscal year.
 
<TABLE>
<CAPTION>
                                                             NUMBER OF SECURITIES
                                                            UNDERLYING UNEXERCISED        VALUE OF UNEXERCISED
                                                                OPTIONS AS OF             IN-THE-MONEY OPTIONS
                                                            DECEMBER 27, 1996 (2)      AS OF DECEMBER 27, 1996(3)
                           SHARES ACQUIRED     VALUE      --------------------------  ----------------------------
NAME                         ON EXERCISE    REALIZED (1)  EXERCISABLE  UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
- -------------------------  ---------------  ------------  -----------  -------------  -------------  -------------
<S>                        <C>              <C>           <C>          <C>            <C>            <C>
Donald Green.............        --         $    --          108,558        181,344    $ 5,193,968    $ 7,892,539
Carl J. Grivner..........        46,666        2,292,467      12,401        152,933        650,503      8,039,699
Karen Godfrey............        20,000          170,000      36,440         38,760      1,928,445      2,043,593
Glenn Lillich............       --               --          160,534         87,466      8,533,982      4,630,868
Dan E. Steimle...........        160,000         236,000      18,400         33,600        971,200      1,767,300
</TABLE>
 
- ---------
(1)  Based upon the  difference between the  exercise price and  the fair market
    value of the Company's Common Stock on the date of exercise.
 
                                       43
<PAGE>
(2) 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  (other  than  184,000  of Mr.  Green's  options,  which  vest in
    successive equal monthly  installments over  24 months  of service  measured
    from  the date of grant). 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.
 
(3) Based on  the last  reported sale  price of  the Company's  Common Stock  on
    December  27, 1996  ($53.25 per share)  less the exercise  price payable for
    such shares.
 
COMPENSATION, 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."
 
    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. See "Certain Transactions."
 
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  7,008,142  shares  of  Common  Stock  are  currently
authorized  for issuance under the 1996 Plan. This 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 December 31,  1996, there were
options to purchase  4,313,544 shares  under the  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").
 
    Outstanding options under the Predecessor  Plan have been incorporated  into
the  1996 Plan, 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.
 
                                       44
<PAGE>
    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
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
 
                                       45
<PAGE>
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 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
 
                                       46
<PAGE>
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. The initial offering period
began on October 1, 1996 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.
 
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.
 
                                       47
<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 and Selling 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) An aggregate of 1,207,327 shares of Common Stock were issued upon  exercise
    of  these Common  Stock Warrants  in October  1996 at  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) An aggregate of 767,463 shares of Common Stock were issued upon exercise of
    these  Common  Stock  Warrants in  October  1996 at  the  following exercise
    prices: 6,469 at $0.025  per share, 70,666 at  $0.125 per share, 149,347  at
    $0.25 per share and 540,981 at $1.165 per share.
 
                                       48
<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 in October 1996. 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 converted into 1.09656 shares of Common
Stock  and each share of Series E  Preferred Stock converted into 1.02529 shares
of Common  Stock. Such  conversion into  Common Stock  automatically occured  in
October  1996. 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. In August  1996, the  Company
forgave one-third of the principal balance and interest accrued through July 19,
1996.  As of December 31, 1996, two-thirds of the principal balance of this loan
remained 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. On December  23,
1996 the Company and
 
                                       49
<PAGE>
the   joint  venture  partner  entered  into   an  agreement  to  terminate  the
partnership. In  connection  with the  dissolution,  the joint  venture  partner
reimbursed the Company $1,683,000 for all loans and advances made by the Company
to  date. In addition, the Company and  the joint venture partner entered into a
License and Marketing  Agreement and  an OEM  Agreement. Under  the License  and
Marketing  Agreement, the Company granted to the joint venture partner a license
to use the UMC technology in  the development, manufacture, and distribution  of
coaxial  systems  for specified  markets. In  return,  the Company  will receive
royalties from the sale  of these systems. Under  the OEM Agreement the  Company
agreed  to  manufacture the  UMC  products for  the  joint venture  partner. See
"Business -- Markets and Customers."
 
    The Company has granted  options to certain of  its directors and  executive
officers.  See  ``Management  --  Executive  Compensation"  and  ``Principal and
Selling 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.
 
                                       50
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
    The  following table sets forth certain information regarding the beneficial
ownership of the Company's Common Stock as of December 31, 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, (iv)
all directors and  executive officers of  the Company  as a group  and (v)  each
Selling Stockholder.
 
<TABLE>
<CAPTION>
                                                           SHARES BENEFICIALLY
                                                             OWNED PRIOR TO                        SHARES BENEFICIALLY
                                                              OFFERING (1)          NUMBER OF     OWNED AFTER OFFERING
                                                        -------------------------  SHARES BEING  -----------------------
NAME OF BENEFICIAL OWNERS                                  NUMBER       PERCENT    OFFERED (2)     NUMBER      PERCENT
- ------------------------------------------------------  ------------  -----------  ------------  ----------  -----------
<S>                                                     <C>           <C>          <C>           <C>         <C>
Tellabs, Inc. (3) ....................................     3,889,966       11.8%       735,492    3,154,474        9.4%
 4951 Indiana Avenue
 Lisle, IL 60532
Coral Partners II (4) ................................     3,308,665       10.1         --        3,308,665       10.0
 60 South Sixth Street, Suite 3510
 Minneapolis, MN 55402
St. Paul Venture Capital, Inc. (5) ...................     3,252,031        9.7        614,874    2,637,157        7.8
 8500 Normandale Lake Blvd., Suite 1940
 Bloomington, MN 55437
Vanguard IV, L.P. ....................................     2,946,397        9.0        250,000    2,696,397        8.1
 525 University Avenue
 Palo Alto, CA 94301
Harris Corporation (6) ...............................     1,764,973        5.3        300,000    1,464,973        4.4
 DTS Division
 300 Bel Marin Keys Blvd.
 Novato, CA 94944-1188
B.J. Cassin (7).......................................     1,342,915        4.1         50,000    1,292,915        3.9
Donald Green (8)......................................     1,820,101        5.5         --        1,820,101        5.4
Carl J. Grivner (9)...................................       216,000          *         --          216,000       *
Clifford H. Higgerson (10)............................     2,946,397        9.0        250,000    2,696,397        8.1
Brian Jackman (11)....................................     3,910,932       11.9        735,492    3,175,440        9.5
Dan Rasdal (12).......................................        63,000          *         --           63,000       *
Karen Godfrey (13)....................................       101,586          *         --          101,586       *
Glenn Lillich (14)....................................       268,000          *         --          268,000       *
Dan E. Steimle (15)...................................       255,407          *         --          255,407       *
All executive officers and directors as a group (9
 persons) (16)........................................    10,924,338       31.9      1,035,492    9,888,846       28.5
Norwest Equity Partners V.............................     1,004,021        3.1        189,834      814,187        2.5
Henri Sulzer (17).....................................       872,185        2.7         11,644      860,541        2.6
Japan Associated Finance Co., Ltd. (18)...............       732,348        2.2        100,000      632,348        1.9
DSC Communications Corporation........................       725,787        2.2        137,228      588,559        1.8
Estate of Chris McGill (19)...........................        48,772          *          3,000       45,772       *
John P. Kern and Jeanette E. Kern, TTEES
 John P. Kern and Jeanette E. Kern Living Trust U/A
 DTD 02/21/91 (20)....................................        41,931          *          7,928       34,003       *
</TABLE>
 
- ---------
 *  Less than 1%.
 
                                       51
<PAGE>
 (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, 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)  Assumes  (i) the  issuance  of 307,928  shares  of Common  Stock  upon the
    anticipated exercise of warrants by certain Selling Stockholders and (ii) no
    exercise of the Underwriters'  over-allotment option. If the  over-allotment
    option  is  exercised  in  full,  certain  Selling  Stockholders  will  sell
    additional shares,  as  follows: Tellabs,  Inc.  (56,608 shares);  St.  Paul
    Venture  Capital, Inc. (258,554  shares); Norwest Equity  Partners V (10,166
    shares); Henri Sulzer (4,896 shares); DSC Communications Corporation (57,704
    shares) and  John P.  Kern and  Jeanette E.  Kern, TTEES  John P.  Kern  and
    Jeanette E. Kern Living Trust U/A DTD 02/21/91 (2,072 shares).
 
 (3) Includes 300,000 shares which may be acquired upon exercise of a warrant.
 
 (4)  Includes 4,150 shares held by Yuval Almog  and 5,263 shares held in an IRA
    by Dain Bosworth, Inc. as a custodian  for the benefit of Yuval Almog.  Also
    includes 4,150 shares held by Peter McNerney. Messrs. Almog and McNerney are
    two  of 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  and Mr.  McNerney  disclaim  beneficial
    ownership of such shares.
 
 (5)  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.
 
 (6)  Includes 800,000 shares which may be  acquired upon exercise of a warrant,
    of which 300,000 shares are expected to be exercised in connection with this
    offering.
 
 (7) Includes 255,433  shares held  by Mr. Cassin  as a  conservator for  Robert
    Cassin,  43,380 of which shares may be  acquired upon exercise of a warrant,
    100,000 shares held  in trust by  the Cassin Family  Foundation and  100,000
    shares  held in trust  by the Cassin Family  Charitable Remainder Trust. 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. Of the
    50,000 shares shown  in this table  as being offered  by Mr. Cassin,  25,000
    shares  are being offered  by each of  the Cassin Family  Foundation and the
    Cassin Family Charitable Remainder Trust.
 
 (8) Includes  289,902 shares  issuable upon  exercise of  options held  by  Mr.
    Green,  127,467 of which shares  will be vested as  of 60 days from December
    31, 1996. Also includes  294,044 shares which may  be acquired by Mr.  Green
    upon  exercise  of  warrants.  Excludes shares  held  by  Mr.  Green's adult
    children.
 
 (9) Includes  165,334 shares  issuable upon  exercise of  options held  by  Mr.
    Grivner,  19,467 of which shares will be  vested as of 60 days from December
    31, 1996.
 
(10) Includes 2,946,397  shares held  by Vanguard IV,  L.P. 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,  38,400 of which shares  will be vested as  of 60 days from December
    31, 1996.
 
(13) Includes  75,200 shares  issuable  upon exercise  of  options held  by  Ms.
    Godfrey,  40,813 of which shares will be  vested as of 60 days from December
    31, 1996.
 
                                       52
<PAGE>
(14) Includes  248,000 shares  issuable upon  exercise of  options held  by  Mr.
    Lillich,  168,800 of which shares will be vested as of 60 days from December
    31, 1996. Also includes 20,000 shares which may be acquired upon exercise of
    a warrant.
 
(15) Includes 58,667  shares subject to  a right of  repurchase by the  Company.
    Includes  52,000  shares  issuable  upon exercise  of  options  held  by Mr.
    Steimle, 20,113 of which shares will be  vested as of 60 days from  December
    31,  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.
 
(16)  Includes 58,667 shares  subject to a  right of repurchase  by the Company.
    Includes 893,436 shares issuable upon exercise of options, 415,080 of  which
    shares  will be  vested as of  60 days  from December 31,  1996, and 667,424
    shares which may be acquired upon exercise of warrants.
 
(17) Includes  130,600 shares  issuable upon  exercise of  options held  by  Mr.
    Sulzer,  107,486 of which shares will be  vested as of 60 days from December
    31, 1996.
 
(18) Represents  shares held  by the  following entities  affiliated with  Japan
    Associated  Finance Co.,  Ltd.: Japan  Associated Finance  Co., Ltd. (29,295
    shares), JAFCO  R-1(A) Investment  Enterprise Partnership  (28,302  shares).
    JAFCO  R-1(B) Investment  Enterprise Partnership (28,302  shares), JAFCO G-5
    Investment Enterprise  Partnership  (60,570  shares)  and  U.S.  Information
    Technology Investment Enterprise Partnership (585,879 shares). Of the 28,500
    shares  to be  sold in  this offering,  4,000 shares  will be  sold by Japan
    Associated Finance Co.,  Ltd., 3,865  shares will  be sold  by JAFCO  R-1(A)
    Investment Enterprise Partnership, 3,865 shares will be sold by JAFCO R-1(B)
    Investment  Enterprise Partnership, 8,270  shares will be  sold by JAFCO G-5
    Investment  Enterprise  Partnership  and  80,000   will  be  sold  by   U.S.
    Information Technology Investment Enterprise Partnership.
 
(19) Includes 8,000 shares which may be acquired upon exercise of a warrant.
 
(20) Includes 20,000 shares which may be acquired upon exercise of a warrant, of
    which  7,928 shares  are expected  to be  exercised in  connection with this
    offering.
 
                                       53
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The authorized capital stock of  the Company consists 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  December 31,  1996,  there were  32,649,607  shares of  Common  Stock
outstanding,  held  of  record by  211  stockholders. There  will  be 33,157,535
shares, of  Common Stock  outstanding after  giving effect  to the  sale of  the
shares  of Common Stock  offered hereby after  giving effect to  the exercise of
warrants to  purchase  307,928  shares  in connection  with  this  offering  and
assuming  no exercise  after December  31, 1996  of any  other outstanding stock
options and warrants.  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 December 31, 1996, after giving effect to the exercise of warrants to
purchase 307,928  shares  in connection  with  this offering,  the  Company  had
outstanding  warrants to  purchase an  aggregate of  2,265,848 shares  of Common
Stock with the following per share  exercise prices: 446,592 at $0.025;  101,988
at  $0.125; 450,000 at  $0.25; 1,237,200 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
 
                                       54
<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
 
                                       55
<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 19,368,927 shares  of
Common  Stock outstanding or issuable upon exercise of outstanding warrants (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 transfer agent and registrar of  the Common Stock is The First  National
Bank of Boston.
 
                                       56
<PAGE>
                        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 and by
the following lock-up agreements: (i)  in connection with the Company's  initial
public  offering,  the Company's  officers,  directors and  certain stockholders
agreed (the "IPO Lock-Up Agreement") not to sell or otherwise dispose of any  of
their  shares for 180  days following the  date of the  Company's initial public
offering without the  prior consent of  Morgan Stanley &  Co. Incorporated;  and
(ii)  in  connection  with  this  offering,  the  Company's  executive officers,
directors and the Selling Stockholders have entered into agreements with  Morgan
Stanley  &  Co. Incorporated  (the "Follow-On  Lock-Up Agreements")  pursuant to
which such holders  agreed not  to sell  or otherwise  dispose of  any of  their
shares  for 90 days following completion of  this offering. Morgan Stanley & Co.
Incorporated may,  however, in  its  sole discretion  at  any time  and  without
notice,  release  all  or  any  portion of  the  securities  subject  to Lock-Up
Agreements. Upon completion of this offering, the Company will have  outstanding
33,157,535  shares of Common Stock. Of these shares: 7,793,750 shares (including
the 5,175,000  shares sold  in the  Company's initial  public offering  and  the
2,600,000  shares sold in  this offering) will be  available for immediate sale;
10,547,936 shares  will  become  eligible  for  sale  on  March  30,  1997  upon
expiration  of  the IPO  Lock-Up Agreements  pursuant  to Rule  701 or  Rule 144
(subject in certain cases to the volume limitations of Rule 144); 13,346  shares
will  become eligible for sale pursuant to Rule 144 (subject in certain cases to
the applicable Rule 144 volume limitations)  at various dates between March  30,
1997 and the expiration date of the Follow-On Lock-Up Agreements upon expiration
of  the  applicable  Rule 144  holding  periods; 11,499,943  shares  will become
eligible for sale 90 days after the completion of this offering upon  expiration
of the Follow-On Lock-Up Agreements pursuant to Rule 701 or Rule 144 (subject in
certain  cases  to  the  volume  limitations of  Rule  144);  and  the remaining
3,302,560 shares will become eligible for sale pursuant to Rule 144 (subject  in
certain  cases to the  applicable Rule 144 volume  limitations) at various dates
following expiration of the Follow-On Lock-Up Agreements.
 
    In general, under  Rule 144  as currently in  effect, 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   (approximately  330,000   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 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.
 
    In addition, as of December 31,  1996, the Company had outstanding  warrants
to  purchase  an aggregate  of 2,265,848  shares of  Common Stock  (after giving
effect to the exercise of warrants to purchase 307,928 shares in connection with
this offering). These warrants contain net exercise provisions. Accordingly, any
shares issued  upon net  exercise will  be eligible  for sale  immediately  upon
expiration of any lock-up
 
                                       57
<PAGE>
agreements  to which such shares are subject  pursuant to Rule 144. In addition,
the Company has filed a registration  statement on Form S-8 with the  Commission
registering  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,  4,313,544 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 as follows: 3,290,108 shares on
March 30, 1997 and the remaining 1,023,436 shares 90 days from the date of  this
Prospectus. The 1,500,000 shares reserved under the Employee Stock Purchase Plan
will   be  eligible  for  sale  upon  issuance.  In  addition,  the  holders  of
approximately 19,368,927 shares  of Common  Stock outstanding  or issuable  upon
exercise  of outstanding warrants 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" and "Underwriters."
 
                                       58
<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........................................................
  Merrill Lynch, Pierce, Fenner & Smith
            Incorporated...................................................................
  Cowen & Company..........................................................................
  Hambrecht & Quist LLC....................................................................
                                                                                             ----------
    Subtotal...............................................................................   2,080,000
                                                                                             ----------
International Underwriters:
  Morgan Stanley & Co. International Limited...............................................
  Merrill Lynch International..............................................................
  Cowen & Company..........................................................................
  Hambrecht & Quist LLC....................................................................
                                                                                             ----------
    Subtotal...............................................................................     520,000
                                                                                             ----------
      Total................................................................................   2,600,000
                                                                                             ----------
                                                                                             ----------
</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.
 
    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 any prospectus
relating to the U.S.  Shares 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 any prospectus relating to the  International
Shares  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
 
                                       59
<PAGE>
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  or to, or for the benefit of,  any resident of any province or territory
of Canada in contravention  of the securities laws  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 or  to, or  for the  benefit of, any
resident of  any  province  or  territory of  Canada  in  contravention  of  the
securities  laws 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 and the Regulations 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 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  and  other
relevant  laws  and regulations  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 by purchasing such shares  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 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  and other relevant laws and regulations 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 public offering price set forth on the cover
page   hereof   and    part   to    certain   dealers   at    a   price    which
 
                                       60
<PAGE>
represents  a concession not in excess of $    a share under the public offering
price. Any Underwriter may allow, and such dealers may reallow, a concession not
in excess of $    a share to other Underwriters or to certain other dealers.
 
    Certain Selling  Stockholders  have  granted to  the  U.S.  Underwriters  an
option, exercisable for 30 days from the date of this Prospectus, to purchase up
to  an aggregate  of 390,000  additional shares  of Common  Stock at  the 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 Company, the Selling  Stockholders 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 90 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  90 days after the  date of this  Prospectus, without the prior
written consent of Morgan Stanley & Co. Incorporated.
 
    Pursuant  to  regulations  promulgated   by  the  Securities  and   Exchange
Commission  (the  "Commission"),  market  makers in  the  Common  Stock  who are
Underwriters or prospective underwriters ("passive market makers") may,  subject
to  certain limitations, make  bids for or  purchases of shares  of Common Stock
until the  earlier of  the time  of commencement  (the "Commencement  Date")  of
offers  or sales of the Common Stock contemplated by this Prospectus or the time
at which a stabilizing bid for such shares is made. In general, on and after the
date two business days  prior to the Commencement  Date (1) such market  maker's
net  daily purchases of the Common Stock may not exceed 30% of its average daily
trading volume  in such  stock  for the  two  full consecutive  calendar  months
immediately  preceding the  filing date of  the registration  statement of which
this Prospectus forms a part, (2) such market maker may not effect  transactions
in,  or display bids for,  the Common Stock at a  price that exceeds the highest
bid for the Common Stock  by persons who are not  passive market makers and  (3)
bids made by passive market makers must be identified as such.
 
                                       61
<PAGE>
                                 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, 1995
and 1996, and for each of the years in the three-year period ended December  31,
1996, 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.
 
                             ADDITIONAL INFORMATION
 
    The  Company has filed with 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. The
Company is  also  subject to  the  information requirements  of  the  Securities
Exchange  Act  of  1934,  and  in  accordance  therewith  files  reports,  proxy
statements and other information with the Commission. Copies of the Registration
Statement and the exhibits and schedules thereto, reports, proxy statements  and
other  information filed by the Company 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. In addition, the  Common Stock of the  Company is quoted  on
the Nasdaq National Market. Reports and other information concerning the Company
may be inspected at the National Association of Securities Dealers, Inc., 1735 K
Street, Washington, D.C.
 
                                       62
<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
 (ASIC)......................................  semi-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.
E1 Transceivers..............................  A  transmitter and receiver (transceiver) for
                                               sending  digital  data  at  2.04  Mbps   over
                                               twisted pair cabling.
</TABLE>
 
                                       63
<PAGE>
<TABLE>
<S>                                            <C>
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.
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.
</TABLE>
 
                                       64
<PAGE>
<TABLE>
<S>                                            <C>
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>
 
                                       65
<PAGE>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
 
<S>                                                                                                          <C>
Independent Auditors' Report...............................................................................        F-2
 
Consolidated Balance Sheets as of December 31, 1995 and 1996...............................................        F-3
 
Consolidated Statements of Operations for the years ended December 31, 1994, 1995 and 1996.................        F-4
 
Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) for
 the years ended December 31, 1994, 1995 and 1996..........................................................        F-5
 
Consolidated Statements of Cash Flows for the years ended December 31, 1994, 1995 and 1996.................        F-6
 
Notes to Consolidated Financial Statements.................................................................        F-7
</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,
1995 and 1996, and the related consolidated statements of operations, redeemable
convertible  preferred stock and  stockholders' equity (deficit)  and cash flows
for each of the years  in the three-year period  ended December 31, 1996.  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, 1995 and 1996, and the results of its operations and its cash
flows for each of the years in the three-year period ended December 31, 1996, in
conformity with generally accepted accounting principles.
 
                                          KPMG PEAT MARWICK LLP
 
San Francisco, California
January 20, 1997
 
                                      F-2
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                          CONSOLIDATED BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                 DECEMBER 31,
                                                                                            ----------------------
                                                                                               1995        1996
                                                                                            ----------  ----------
<S>                                                                                         <C>         <C>
Current assets:
  Cash and cash equivalents, including restricted cash of
   $1,730 and $150 in 1995 and 1996, respectively.........................................  $   11,118  $   24,942
  Marketable securities...................................................................      --          83,488
  Accounts receivable.....................................................................      10,993      32,779
  Inventories.............................................................................      10,149      17,349
  Deferred income taxes...................................................................      --           2,889
  Prepaid expenses........................................................................         132         742
                                                                                            ----------  ----------
    Total current assets..................................................................      32,392     162,189
Property and equipment, net...............................................................       1,828       9,589
Other assets..............................................................................       2,460       3,901
                                                                                            ----------  ----------
      Total assets........................................................................  $   36,680  $  175,679
                                                                                            ----------  ----------
                                                                                            ----------  ----------
 
                       LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND
                                    STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Accounts payable........................................................................  $    7,121  $    8,799
  Accrued liabilities.....................................................................       6,501       8,052
                                                                                            ----------  ----------
    Total current liabilities.............................................................      13,622      16,851
Long-term liabilities.....................................................................       1,046         805
Redeemable convertible preferred stock, $0.01 par value; 35,345,816 shares authorized in
 1995; 17,011,204 shares issued and outstanding in 1995...................................      37,777      --
Stockholders' equity (deficit):
  Preferred stock, $0.01 par value; 5,000,000 shares authorized in 1996; no shares issued
   and outstanding in 1996................................................................      --          --
  Common stock, $0.01 par value; 84,654,184 and 100,000,000 shares authorized in 1995 and
   1996, respectively; 5,015,168 and 32,649,607 shares issued and outstanding in 1995 and
   1996, respectively.....................................................................          50         326
  Additional paid-in capital..............................................................      (2,248)    164,002
  Notes receivable from stockholders......................................................        (176)       (151)
  Accumulated deficit.....................................................................     (13,391)     (6,154)
                                                                                            ----------  ----------
    Total stockholders' equity (deficit)..................................................     (15,765)    158,023
                                                                                            ----------  ----------
      Total liabilities, redeemable convertible preferred stock, and stockholders' equity
       (deficit)..........................................................................  $   36,680  $  175,679
                                                                                            ----------  ----------
                                                                                            ----------  ----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-3
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                      YEAR ENDED DECEMBER 31,
                                                                                  --------------------------------
                                                                                    1994       1995        1996
                                                                                  ---------  ---------  ----------
<S>                                                                               <C>        <C>        <C>
Revenues........................................................................  $  18,802  $  54,287  $  130,193
Cost of revenues................................................................     14,124     33,469      73,950
                                                                                  ---------  ---------  ----------
    Gross profit................................................................      4,678     20,818      56,243
                                                                                  ---------  ---------  ----------
Operating expenses:
  Research and development......................................................      2,867      5,730      14,413
  Selling, general, and administrative..........................................      5,051      9,660      21,188
  DSC litigation costs..........................................................      4,551      1,623      18,947
                                                                                  ---------  ---------  ----------
    Total operating expenses....................................................     12,469     17,013      54,548
                                                                                  ---------  ---------  ----------
    Operating income (loss).....................................................     (7,791)     3,805       1,695
Other income (expense):
  Gain on dissolution (equity in loss) of joint venture, net....................     --         (1,516)      1,516
  Other income, net.............................................................         26        149         872
                                                                                  ---------  ---------  ----------
    Income (loss) before income taxes...........................................     (7,765)     2,438       4,083
Income taxes (benefit)..........................................................     --             97      (3,154)
                                                                                  ---------  ---------  ----------
    Net income (loss)...........................................................  $  (7,765) $   2,341  $    7,237
                                                                                  ---------  ---------  ----------
                                                                                  ---------  ---------  ----------
Pro forma net income per share..................................................             $    0.09  $     0.21
                                                                                             ---------  ----------
                                                                                             ---------  ----------
Shares used in per share computations...........................................                27,329      34,282
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF REDEEMABLE
         CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
                 YEARS ENDED DECEMBER 31, 1994, 1995, AND 1996
                       (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,
 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
 options and warrants...........      --         --         86,252           1           10          --               --
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 options
 and warrants...................      --         --      1,358,844          13        1,435          --               --
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.....     220,000      1,540     --          --           --              --               --
Issuance of common stock in
 settlement of litigation.......      --         --        725,787           7        8,986          --               --
Exercise of common stock options
 and warrants...................      --         --      3,016,189          30          112          --               --
Initial public offering of
 common stock...................                         5,175,000          52      118,022
Conversion of preferred stock to
 common stock...................  (17,231,204)   (39,317) 18,717,463        187      39,130          --               --
Payment of notes receivable from
 stockholder....................      --         --         --          --           --                  25           --
Net income......................      --         --         --          --           --              --                7,237
                                  ----------  ---------  ---------       -----   -----------          -----      ------------
Balances as of December 31,
 1996...........................      --      $  --      32,649,607  $     326    $ 164,002       $    (151)      $   (6,154)
                                  ----------  ---------  ---------       -----   -----------          -----      ------------
                                  ----------  ---------  ---------       -----   -----------          -----      ------------
 
<CAPTION>
 
                                      TOTAL
                                  STOCKHOLDERS'
                                     EQUITY
                                    (DEFICIT)
                                  -------------
<S>                               <C>
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
 options and warrants...........           11
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 options
 and warrants...................        1,448
Net income......................        2,341
                                  -------------
Balances as of December 31,
 1995...........................      (15,765)
Issuance of preferred stock.....       --
Issuance of common stock in
 settlement of litigation.......        8,993
Exercise of common stock options
 and warrants...................          142
Initial public offering of
 common stock...................      118,074
Conversion of preferred stock to
 common stock...................       39,317
Payment of notes receivable from
 stockholder....................           25
Net income......................        7,237
                                  -------------
Balances as of December 31,
 1996...........................    $ 158,023
                                  -------------
                                  -------------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                        YEAR ENDED DECEMBER 31,
                                                                                    -------------------------------
                                                                                      1994       1995       1996
                                                                                    ---------  ---------  ---------
<S>                                                                                 <C>        <C>        <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income (loss)...............................................................  $  (7,765) $   2,341  $   7,237
  Adjustments to reconcile net income (loss) to net cash used in operating
   activities:
    Noncash portion of litigation settlement......................................     --         --         12,807
    Deferred income taxes.........................................................     --         --         (3,679)
    Depreciation and amortization.................................................        199        547        956
    Equity in loss (gain on dissolution) of joint venture, net....................     --          1,516     (1,149)
    Changes in operating assets and liabilities:
      Accounts receivable.........................................................     (4,815)    (5,802)   (21,403)
      Inventories.................................................................     (2,513)    (5,529)    (5,714)
      Prepaid expenses and other assets...........................................       (109)      (169)      (588)
      Accounts payable............................................................      1,266      4,516      1,602
      Accrued liabilities.........................................................      3,215      1,626      3,442
      Long-term liabilities.......................................................        (30)       (17)       258
                                                                                    ---------  ---------  ---------
       NET CASH USED IN OPERATING ACTIVITIES......................................    (10,552)      (971)    (6,231)
                                                                                    ---------  ---------  ---------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Net purchases of marketable securities..........................................     --         --        (83,488)
  Acquisition of technology license...............................................     --         (1,000)    --
  Purchase of property and equipment..............................................       (452)    (1,084)    (8,367)
  Reimbursement of loans (advances) to joint venture..............................     --         (1,516)     1,516
  Business acquisition, net of cash acquired......................................     --         --           (783)
                                                                                    ---------  ---------  ---------
       NET CASH USED IN INVESTING ACTIVITIES......................................       (452)    (3,600)   (91,122)
                                                                                    ---------  ---------  ---------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Proceeds from bank borrowings...................................................     --          1,550     16,806
  Repayment of bank borrowings....................................................     --         (1,550)   (16,806)
  Prepayment of long-term portion of litigation settlement........................     --         --         (7,064)
  Proceeds from stockholder loans.................................................      1,000     --         --
  Repayment of stockholder loans..................................................       (500)    --         --
  Proceeds from initial public offering of common stock...........................     --         --        118,074
  Proceeds from issuance of redeemable convertible preferred stock................     13,901     14,539     --
  Repurchase of redeemable convertible preferred stock............................     --         (4,156)    --
  Proceeds from exercise of common stock options and warrants.....................         11      1,448        167
                                                                                    ---------  ---------  ---------
       NET CASH PROVIDED BY FINANCING ACTIVITIES..................................     14,412     11,831    111,177
                                                                                    ---------  ---------  ---------
INCREASE IN CASH AND CASH EQUIVALENTS.............................................      3,408      7,260     13,824
 
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR......................................        450      3,858     11,118
                                                                                    ---------  ---------  ---------
CASH AND CASH EQUIVALENTS, END OF YEAR............................................  $   3,858  $  11,118  $  24,942
                                                                                    ---------  ---------  ---------
                                                                                    ---------  ---------  ---------
NONCASH FINANCING AND INVESTING ACTIVITIES:
  Conversion of notes payable to redeemable convertible preferred stock...........  $     500  $  --      $  --
  Issuance of common stock for notes receivable...................................     --            176     --
  Deferred portion of technology license fee......................................     --          1,500     --
  Issuance of preferred stock for business acquisition............................     --         --          1,540
CASH PAID:
  Interest........................................................................         21         37        398
  Income taxes....................................................................     --         --            265
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-6
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 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 wire, fiber optic cable,  coaxial
cable 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.
 
    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-sales
securities and their cost approximates their market value. Included in cash  and
cash  equivalents is  $833,000 and  $150,000 as of  December 31,  1995 and 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 10.
 
    MARKETABLE SECURITIES
 
    All  marketable  securities  are classified  as  available-for-sale  and are
stated at estimated fair value. Unrealized  gains and losses were immaterial  as
of December 31, 1996, and realized gains and losses were immaterial for the year
ended December 31, 1996.
 
    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.
Deferred  tax  assets and  liabilities are  recognized based  on the  future tax
consequences  attributable  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.
 
    EQUITY-BASED COMPENSATION PLANS
 
    The Company accounts for equity-based compensation plans using the intrinsic
value method.
 
                                      F-7
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
    PRO FORMA NET INCOME PER SHARE
 
    Pro forma net income 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.  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. For international shipments, the Company generally
requires prepayment or letters of credit.
 
    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.
 
    IMPAIRMENT OF LONG-LIVED ASSETS AND LONG-LIVED ASSETS TO BE DISPOSED OF
 
    The  Company  adopted the  provisions of  Statement of  Financial Accounting
Standards No.  121,  ACCOUNTING FOR  THE  IMPAIRMENT OF  LONG-LIVED  ASSETS  AND
LONG-LIVED  ASSETS TO BE DISPOSED OF,  effective January 1, 1996. This statement
requires long-lived assets  to be  evaluated for impairment  whenever events  or
changes  in circumstances indicate that the carrying amount of the asset may not
be recoverable. Adoption of this statement did not have a material effect on the
Company's consolidated financial position or results of operations.
 
NOTE 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  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 extent of the  Company's loans and advances  therein. As a consequence,  the
Company's loans and advances to the joint venture had been reduced to zero.
 
    On December 23, 1996, the Company and the joint venture partner entered into
an  agreement to terminate the partnership.  In connection with the dissolution,
the joint venture partner  reimbursed the Company $1,683,000  for all loans  and
advances  made by the Company to date.  The reimbursement was recorded as a gain
and is reflected in gain on dissolution  (equity in loss) of joint venture,  net
in  the accompanying consolidated financial statements. In addition, the Company
and the joint venture partner entered into a License and Marketing Agreement and
an OEM Agreement.
 
                                      F-8
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 2 -- JOINT VENTURES (CONTINUED)
    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,  AFTEK
Hangzhou,   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.
 
    On August 10, 1996, AFTEK Hong Kong and its joint venture partner agreed  to
liquidate  AFTEK  Hangzhou. The  partners appointed  a liquidation  committee to
facilitate the  liquidation procedures  and to  ensure that  the liquidation  is
completed  in accordance with  the relevant stipulations  contained in the joint
venture agreement.  The  Company  has  recorded  a  provision  of  approximately
$383,000  reflecting the  reduction in  the net  realizable value  of AFTEK Hong
Kong's interest  in  the joint  venture's  net  assets to  be  distributed  upon
liquidation.
 
    The Company had sales to AFTEK Hong Kong of $2,020,000 in 1995.
 
NOTE 3 -- MARKETABLE SECURITIES
    Marketable  securities were  comprised of the  following as  of December 31,
1996 (in thousands):
 
<TABLE>
<CAPTION>
                                                                                    FAIR
                                                                                    VALUE
                                                                                  ---------
<S>                                                                               <C>
Municipal debt securities.......................................................  $  61,488
Corporate debt securities.......................................................     22,000
                                                                                  ---------
Total marketable securities.....................................................  $  83,488
                                                                                  ---------
                                                                                  ---------
</TABLE>
 
    The fair value of securities maturing in one year or less and those maturing
between one year and five years was $54,128,000 and $29,360,000, respectively.
 
NOTE 4 -- INVENTORIES
    The major components of inventories are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                        DECEMBER 31,
                                                                    --------------------
                                                                      1995       1996
                                                                    ---------  ---------
<S>                                                                 <C>        <C>
Raw materials.....................................................  $   5,155  $   7,631
Work-in-progress..................................................        899        155
Finished goods....................................................      4,095      9,563
                                                                    ---------  ---------
                                                                    $  10,149  $  17,349
                                                                    ---------  ---------
                                                                    ---------  ---------
</TABLE>
 
                                      F-9
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 5 -- PROPERTY AND EQUIPMENT
    A summary of property and equipment follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                       --------------------
                                                                         1995       1996
                                                                       ---------  ---------
<S>                                                                    <C>        <C>
Furniture and fixtures...............................................  $     375  $   1,266
Computer and office equipment........................................      1,204      4,306
Engineering equipment................................................        865      5,508
                                                                       ---------  ---------
                                                                           2,444     11,080
Less: accumulated depreciation.......................................        616      1,491
                                                                       ---------  ---------
  Net property and equipment.........................................  $   1,828  $   9,589
                                                                       ---------  ---------
                                                                       ---------  ---------
</TABLE>
 
NOTE 6 -- ACCRUED LIABILITIES
    A summary of accrued liabilities follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                       --------------------
                                                                         1995       1996
                                                                       ---------  ---------
<S>                                                                    <C>        <C>
DSC litigation costs.................................................  $   2,674  $  --
Warranty.............................................................        852      2,550
Other................................................................      2,975      5,502
                                                                       ---------  ---------
                                                                       $   6,501  $   8,052
                                                                       ---------  ---------
                                                                       ---------  ---------
</TABLE>
 
NOTE 7 -- INCOME TAXES
    A  summary  of  the  components  of  income  taxes  (benefit)  follows   (in
thousands):
 
<TABLE>
<CAPTION>
                                                                   CURRENT    DEFERRED     TOTAL
                                                                 -----------  ---------  ---------
<S>                                                              <C>          <C>        <C>
Year ended December 31, 1995:
  Federal......................................................   $      82   $  --      $      82
  State........................................................          15      --             15
                                                                      -----   ---------  ---------
                                                                  $      97   $  --      $      97
                                                                      -----   ---------  ---------
                                                                      -----   ---------  ---------
 
Year ended December 31, 1996:
  Federal......................................................   $     523   $  (2,764) $  (2,241)
  State........................................................           2        (915)      (913)
                                                                      -----   ---------  ---------
                                                                  $     525   $  (3,679) $  (3,154)
                                                                      -----   ---------  ---------
                                                                      -----   ---------  ---------
</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>
                                                                      YEAR ENDED DECEMBER 31,
                                                                  -------------------------------
                                                                    1994       1995       1996
                                                                  ---------  ---------  ---------
<S>                                                               <C>        <C>        <C>
Income taxes (benefit) at statutory rate........................  $  (2,640) $     829  $   1,388
Current losses and temporary differences for which no benefit
 was recognized.................................................      2,640     --            476
Alternative minimum tax.........................................     --             82     --
State taxes net of federal benefit..............................     --             15       (167)
Change in valuation allowance...................................     --           (847)    (4,687)
Other...........................................................     --             18       (164)
                                                                  ---------  ---------  ---------
                                                                  $  --      $      97  $  (3,154)
                                                                  ---------  ---------  ---------
                                                                  ---------  ---------  ---------
</TABLE>
 
                                      F-10
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 7 -- 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,
                                                                 -------------------------------
                                                                   1994       1995       1996
                                                                 ---------  ---------  ---------
<S>                                                              <C>        <C>        <C>
Deferred tax assets:
  Net operating loss carryforwards.............................  $   4,099  $   3,316  $  --
  DSC settlement costs.........................................     --         --          1,257
  Allowances and accruals......................................      1,789      1,914      1,618
  Research tax credit carryforwards............................        374     --            588
  Other........................................................         52          6        216
                                                                 ---------  ---------  ---------
                                                                     6,314      5,236      3,679
Deferred tax liability -- investment in joint venture..........     --           (549)    --
                                                                 ---------  ---------  ---------
                                                                     6,314      4,687      3,679
Less valuation allowance.......................................     (6,314)    (4,687)    --
                                                                 ---------  ---------  ---------
Net deferred tax asset.........................................  $  --      $  --      $   3,679
                                                                 ---------  ---------  ---------
                                                                 ---------  ---------  ---------
</TABLE>
 
    The  net change in the  valuation allowance for the  year ended December 31,
1996 was  a decrease  of approximately  $4,687,000. Management  believes that  a
valuation   allowance  is  not  required,   based  upon  current  and  projected
profitability of the Company.
 
    The Company has research credit carryforwards for federal income tax  return
purposes  of approximately  $588,000. The federal  research credit carryforwards
expire from 2008  through 2011.  The Company also  has California  manufacturing
credits of approximately $276,000; which expire from 2002 through 2004.
 
    The  Tax Reform Act of 1986 and the California Conformity Act of 1987 impose
restrictions  on  the  utilization  of   net  operating  loss  and  tax   credit
carryforwards  in the event of an "ownership  change" as defined by the Internal
Revenue Code. The Company's  ability to utilize its  net operating loss and  tax
credit carryforwards is subject to restriction pursuant to these provisions.
 
NOTE 8 -- 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 expired on  November 15,  1996, but automatically  renews for  successive
thirty  day periods  until terminated by  written agreement. The  line of credit
agreement also contains covenants that  require the Company to maintain  certain
financial  ratios. As of December  31, 1996, the Company  was in compliance with
the covenants contained in the agreement. As  of December 31, 1995 and 1996,  no
borrowings  were  outstanding  under  the line  of  credit,  and  $1,642,000 was
reserved for letters of credit and foreign exchange contracts.
 
    In  July  1996,  the  Company  borrowed  approximately  $7,106,000  under  a
six-month  term loan bearing interest at 5.75%.  The proceeds from the loan were
used to pay the remaining obligations  under the DSC litigation settlement  (See
Note 10). The loan had a $4.0 million compensating balance requirement. The loan
was repaid in October 1996 with a portion of the proceeds from the IPO.
 
NOTE 9 -- REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT)
 
    IPO
 
    In  October 1996,  the Company issued  5,175,000 shares of  its common stock
pursuant to the IPO, which generated approximately $118,074,000 of net  proceeds
to the Company.
 
                                      F-11
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 9 -- REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT) (CONTINUED)
    In  conjunction with  the IPO,  17,231,204 shares  of outstanding redeemable
convertible preferred stock were converted into a total of 18,717,463 shares  of
common  stock.  Prior to  the IPO,  the  Company had  outstanding six  series of
redeemable convertible preferred stock.
 
    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, 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
  Exercised..................................................................   (2,599,763)   0.03-1.17
  Retired....................................................................      (47,541)   0.03-1.17
                                                                               -----------
Warrants outstanding as of December 31, 1996.................................    2,573,776    0.03-7.00
                                                                               -----------
                                                                               -----------
</TABLE>
 
    COMMON STOCK OPTIONS
 
    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"). As of December 31, 1996, a
total of 7,008,142 shares of Common Stock were authorized for issuance under the
1996 Plan. This  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. 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. Options
generally vest 20% on the first anniversary date and ratably over the  following
48  months. The options expire 10 years from  the date of grant and are normally
canceled three months after termination of employment.
 
    A summary of the Company's stock option plan activity is presented below:
 
<TABLE>
<CAPTION>
                                                                          YEAR ENDED DECEMBER 31,
                                                        ------------------------------------------------------------
                                                                             1995                     1996
                                                                    -----------------------  -----------------------
                                                                                 WEIGHTED                 WEIGHTED
                                                           1994                   AVERAGE                  AVERAGE
                                                        ----------               EXERCISE                 EXERCISE
OPTIONS                                                   SHARES      SHARES       PRICE       SHARES       PRICE
- ------------------------------------------------------  ----------  ----------  -----------  ----------  -----------
<S>                                                     <C>         <C>         <C>          <C>         <C>
Outstanding at beginning of year......................   1,608,000   2,734,280   $    0.14    3,890,016   $    0.35
Granted...............................................   1,238,080   1,274,036        0.81    1,083,082       12.33
Exercised.............................................     (21,780)    (53,652)       0.21     (416,426)       0.17
Canceled..............................................     (90,020)    (64,648)       0.24     (243,128)       1.21
                                                        ----------  ----------               ----------
Outstanding at end of year............................   2,734,280   3,890,016        0.35    4,313,544        3.32
Options exercisable at year end.......................               1,189,402                1,705,659
Weighted average fair value of options granted
 during the year......................................                                0.21                     5.89
</TABLE>
 
                                      F-12
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 9 -- REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT) (CONTINUED)
    The following table summarizes  information about stock options  outstanding
as of December 31, 1996:
 
<TABLE>
<CAPTION>
                                 WEIGHTED
      RANGE                       AVERAGE    WEIGHTED
       OF            NUMBER      REMAINING    AVERAGE     NUMBER
    EXERCISE       OUTSTANDING  CONTRACTUAL  EXERCISE   EXCERCISABLE
     PRICES        AT 12/31/96     LIFE        PRICE    AT 12/31/96
- -----------------  -----------  -----------  ---------  -----------
<C>                <C>          <S>          <C>        <C>
      $0.03         1,256,600   6.3 years    $    0.03     973,478
   0.25 - 0.63      1,665,646   8.1               0.38     598,298
   1.50 - 4.70        821,096   9.1               1.63      86,591
  12.00 - 25.00       475,402   9.6              14.30      47,292
  57.63 - 59.63        94,800   9.9              58.54      --
</TABLE>
 
    EMPLOYEE STOCK PURCHASE PLAN
 
    Under the 1996 Employee Stock Purchase Plan (the "Purchase Plan") adopted on
July  12, 1996,  the Company is  authorized to  issue up to  1,500,000 shares of
Common  Stock  to   eligible  employees   of  the   Company  and   participating
subsidiaries.  The Purchase Plan  will be implemented in  a series of successive
offering periods,  each  with a  maximum  duration  of 24  months.  The  initial
offering  period commenced on October 4, 1996  and ends on the last business day
in July 1998. Under the  terms of the Purchase  Plan, eligible employees on  the
start  date of  any offering period  can enter  the Purchase Plan  on that start
date, or  on  any subsequent  semi-annual  entry date.  Individuals  who  become
eligible  after the  start date  may join  the Purchase  Plan on  any subsequent
semi-annual entry date within that period.  Employees may have up to 10  percent
of  their  base  salary  withheld through  payroll  deductions  to  purchase the
Company's Common Stock.  The purchase  price of  the stock  is the  lower of  85
percent  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. Under  the Purchase  Plan,  the purchase  dates are
January 31 and July 31 of each year.
 
    PRO FORMA FAIR VALUE INFORMATION
 
    The Company  applies the  intrinsic value  method prescribed  by  Accounting
Principles  Board Opinion No.  25, ACCOUNTING FOR STOCK  ISSUED TO EMPLOYEES, in
accounting for its stock-based compensation plans. Had compensation cost for the
Company's stock-based  compensation plans  been determined  consistent with  the
fair  value  approach set  forth  in SFAS  No.  123, ACCOUNTING  FOR STOCK-BASED
COMPENSATION, the Company's net  income and earnings per  share would have  been
reduced  to the pro forma amounts indicated below (in thousands except per share
amounts):
 
<TABLE>
<CAPTION>
                                                                 1995        1996
                                                              ----------  ----------
<S>                                                           <C>         <C>
Net income:
  As reported...............................................  $    2,341  $    7,237
  Pro forma.................................................       2,334       6,638
 
Fully diluted earnings per share:
  As reported...............................................  $     0.08  $     0.21
  Pro forma.................................................        0.08        0.19
</TABLE>
 
    The fair value of option grants prior to the IPO is estimated on the date of
grant using  the  minimum  value  method with  the  following  weighted  average
assumptions:  no dividend yield; risk-free interest rates of 6.22% to 6.25%, and
an expected life of 5 years. The  fair value of option grants subsequent to  the
IPO  is estimated  on the date  of grant using  the Black-Scholes option-pricing
model with  the  following  weighted average  assumptions:  no  dividend  yield,
expected  volatility of 55%;  risk-free interest rate of  6.32%; and an expected
life of 5 years.  Compensation cost related to  the Purchase Plan is  recognized
for  the fair value of the employees' purchase rights, which are estimated using
the Black-Scholes model. No compensation expense has been disclosed for 1996 and
1995 as the first purchase date will occur on January 31, 1997.
 
                                      F-13
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 9 -- REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY
(DEFICIT) (CONTINUED)
    STOCK SPLIT AND REINCORPORATION
 
    In August  1996, the  Company's Board  of Directors  approved a  two-for-one
stock  split. The accompanying financial statements and notes have been restated
to give effect to the stock split.
 
NOTE 10 -- 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, 1996  are  summarized as  follows  (in
thousands):
 
<TABLE>
<S>                                                                  <C>
1997...............................................................  $   3,952
1998...............................................................      4,093
1999...............................................................      3,064
2000...............................................................      2,353
2001...............................................................      2,373
Thereafter.........................................................      9,714
                                                                     ---------
Total minimum lease payments.......................................  $  25,549
                                                                     ---------
                                                                     ---------
</TABLE>
 
    Total  rent expense  for all  operating leases  was $462,000,  $887,000, and
$3,030,000 for the years ended December 31, 1994, 1995 and 1996, respectively.
 
    EMPLOYEE BENEFIT PLAN
 
    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 1996, the Company  contributed $133,000 and  $466,000, respectively, to  the
plan.
 
    LITIGATION
 
    DSC:
 
    From  July 1993 until June 1996 the  Company was involved in litigation with
DSC Communications Corporation  ("DSC"). DSC alleged,  among other things,  that
the Company's Universal Modular Carrier 1000-TM- ("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 and $7,106,000  in July 1996, and issued 725,787  shares
of  common stock to DSC. 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, the Company maintains all rights to the UMC technology free and clear
of any claim by DSC.
 
    ITRI:
 
    In  1995,  a  dispute arose  among  the Company,  the  Industrial Technology
Research Institute  ("ITRI"),  a  Taiwanese  government-sponsored  research  and
development  organization in the telecommunications field, 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
application specific integrated circuits ("ASICs") used in manufacturing the UMC
system.
 
                                      F-14
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 10 -- COMMITMENTS AND CONTINGENCIES (CONTINUED)
    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.
 
    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  parties conducted discovery with respect to the royalty and ASIC supply
issues during September  and October,  1996. A hearing  on ITRI's  motion for  a
preliminary  injunction to require  the Company to  continue supplying ASICs and
ITRI's motion to compel arbitration was held  on November 22, 1996. In an  order
dated  January 9,  1997, the  court stayed the  litigation and  granted the ITRI
parties' motion  to compel  arbitration. The  court has  promised, but  not  yet
issued, an opinion explaining the nature and scope of its arbitration order, and
has issued no ruling on the motion for a preliminary injunction.
 
    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
 
                                      F-15
<PAGE>
                      ADVANCED FIBRE COMMUNICATIONS, INC.
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 10 -- COMMITMENTS AND CONTINGENCIES (CONTINUED)
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.  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.
 
NOTE 11 -- COMPANY INFORMATION AND CERTAIN CONCENTRATIONS
    During  1994, one customer  accounted for 27% of  revenues. During 1995, one
customer accounted  for  approximately  16%  of  revenues.  International  sales
constituted 19%, 13% and 21% during 1994, 1995 and 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  primarily of final assembly
and test  of  finished  goods  from  components  and  custom-made  subassemblies
purchased  from  third parties.  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>
                                     [LOGO]
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                  ALTERNATE PAGE FOR INTERNATIONAL PROSPECTUS
 
PROSPECTUS (SUBJECT TO COMPLETION)
ISSUED JANUARY 24, 1997
                                2,600,000 SHARES
 
                                     [LOGO]
 
                                  COMMON STOCK
                             ---------------------
OF THE  2,600,000 SHARES  OF  COMMON STOCK  OFFERED,  520,000 SHARES  ARE  BEING
OFFERED  INITIALLY OUTSIDE OF THE UNITED STATES AND CANADA BY THE INTERNATIONAL
 UNDERWRITERS AND 2,080,000 SHARES ARE  BEING OFFERED INITIALLY IN THE  UNITED
  STATES  AND  CANADA BY  THE U.S.  UNDERWRITERS.  SEE "UNDERWRITERS."  OF THE
  520,000  SHARES  OF  COMMON  STOCK  BEING  OFFERED  BY  THE  INTERNATIONAL
    UNDERWRITERS,  40,000 SHARES ARE BEING SOLD  BY THE COMPANY AND 480,000
     SHARES ARE BEING SOLD BY THE SELLING STOCKHOLDERS. SEE "PRINCIPAL  AND
     SELLING  STOCKHOLDERS."  THE  COMPANY  WILL  NOT  RECEIVE  ANY  OF THE
     PROCEEDS FROM THE SALE  OF SHARES BY  THE SELLING STOCKHOLDERS.  THE
       COMPANY'S  COMMON STOCK  IS LISTED  ON THE  NASDAQ NATIONAL MARKET
       UNDER THE SYMBOL "AFCI." ON JANUARY 23, 1997, THE LAST SALE  PRICE
       OF THE COMMON STOCK AS REPORTED ON THE
        NASDAQ  NATIONAL MARKET WAS $53 1/4  PER SHARE. SEE "PRICE RANGE
                               OF COMMON STOCK."
                           --------------------------
 
         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 $  A SHARE
                            ------------------------
 
<TABLE>
<CAPTION>
                                                       UNDERWRITING                            PROCEEDS TO
                                     PRICE TO         DISCOUNTS AND        PROCEEDS TO           SELLING
                                      PUBLIC         COMMISSIONS (1)       COMPANY (2)         STOCKHOLDERS
                                ------------------  ------------------  ------------------  ------------------
<S>                             <C>                 <C>                 <C>                 <C>
PER SHARE.....................          $                   $                   $                   $
TOTAL (3).....................          $                   $                   $                   $
</TABLE>
 
- ------------
    (1)  THE COMPANY AND  THE SELLING STOCKHOLDERS HAVE  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 $450,000.
 
    (3) CERTAIN SELLING STOCKHOLDERS  HAVE GRANTED TO  THE U.S. UNDERWRITERS  AN
       OPTION,  EXERCISABLE WITHIN 30 DAYS OF THE DATE HEREOF, TO PURCHASE UP TO
       AN AGGREGATE OF  390,000 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 SELLING STOCKHOLDERS WILL BE $            , $
       AND $           , 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             , 1997 AT THE OFFICE OF MORGAN STANLEY & CO. INCORPORATED, NEW
YORK, N.Y., AGAINST PAYMENT THEREFOR IN IMMEDIATELY AVAILABLE FUNDS.
                           --------------------------
 
MORGAN STANLEY & CO.
             INTERNATIONAL
 
                MERRILL LYNCH INTERNATIONAL
 
                                COWEN & COMPANY
 
                                                               HAMBRECHT & QUIST
 
           , 1997
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
    The  following  table  sets forth  the  costs  and expenses  payable  by the
Registrant in connection with the sale  of Common Stock being registered,  other
than  underwriting discounts and  commissions. All amounts  are estimates except
the Securities and Exchange Commission registration fee, the NASD filing fee and
the Nasdaq National Market listing fee.
 
<TABLE>
<CAPTION>
                                                                                     AMOUNT
                                                                                       TO
                                                                                    BE PAID
                                                                                  ------------
<S>                                                                               <C>
 
Securities and Exchange Commission registration fee.............................  $     47,002
NASD filing fee.................................................................        16,011
Nasdaq National Market listing fee..............................................         4,000
Printing and engraving expenses.................................................        85,000
Legal fees and expenses.........................................................       125,000
Accounting fees and expenses....................................................        75,000
Blue sky fees and expenses......................................................         3,000
Transfer agent and registrar fees...............................................         5,000
Miscellaneous expenses..........................................................        89,987
                                                                                  ------------
      Total.....................................................................  $    450,000
                                                                                  ------------
                                                                                  ------------
</TABLE>
 
- ---------
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Section 145 of  the General Corporation  Law of the  state of Delaware  (the
``Delaware  Law") empowers a  Delaware corporation to  indemnify any persons who
are, or  are  threatened to  be  made, parties  to  any threatened,  pending  or
completed   legal  action,   suit  or  proceedings,   whether  civil,  criminal,
administrative or investigative (other  than action by or  in the right of  such
corporation),  by reason of the fact that such person was an officer or director
of such corporation, or is or was serving at the request of such corporation  as
a director, officer, employee or agent of another corporation or enterprise. The
indemnity may include expenses (including attorneys' fees), judgments, fines and
amounts  paid in settlement  actually and reasonably incurred  by such person in
connection with such action, suit or  proceeding, provided that such officer  or
director  acted in good faith and in a manner he reasonably believed to be in or
not opposed to the corporation's best interests, and, for criminal  proceedings,
had  no  reasonable  cause  to  believe  his  conduct  was  illegal.  A Delaware
corporation may indemnify officers and directors in an action by or in the right
of the corporation under the same conditions, except that no indemnification  is
permitted without judicial approval if the officer or director is adjudged to be
liable  to the corporation in  the performance of his  duty. Where an officer or
director is successful on the merits or  otherwise in the defense of any  action
referred to above, the corporation must indemnify him against the expenses which
such officer or director actually and reasonably incurred.
 
    In accordance with the Delaware Law, the certificate of incorporation of the
Company contains a provision to limit the personal liability of the directors of
the Registrant for violations of their fiduciary duty. This provision eliminates
each  director's liability  to the Registrant  or its  stockholders for monetary
damages except (i)  for any  breach of  the director's  duty of  loyalty to  the
Registrant  or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)  under
Section  174  of  the Delaware  Law  providing  for liability  of  directors for
unlawful payment of  dividends or  unlawful stock purchases  or redemptions,  or
(iv)  for any  transaction from  which a  director derived  an improper personal
benefit. The effect of this provision is to eliminate the personal liability  of
directors for monetary damages for actions involving a breach of their fiduciary
duty of care, including any such actions involving gross negligence.
 
                                      II-1
<PAGE>
    Article  five of the Bylaws of the Registrant provide for indemnification of
the officers and directors of the Registrant to the fullest extent permitted  by
applicable law.
 
    In  connection  with the  incorporation of  the Registrant  in the  State of
Delaware, the  Registrant  entered  into indemnification  agreements  with  each
director  and certain  officers, a  form of which  is attached  as Exhibit 10.20
hereto and  incorporated herein  by  reference. The  Indemnification  Agreements
provide   indemnification  to   such  directors   and  officers   under  certain
circumstances for acts or omissions which  may not be covered by directors'  and
officers'  liability  insurance. The  Company  intends to  obtain  directors and
officers  liability  insurance,  which  will  insure  against  liabilities  that
directors  or officers of the Company may incur in such capacities. Reference is
also made to Section  7 of the Underwriting  Agreement contained in Exhibit  1.1
hereto,  indemnifying officers and  directors of the  Registrant against certain
liabilities.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
    Since January  1994,  the  Registrant  has sold  and  issued  the  following
securities  which were not registered under the Securities Act (all numbers take
into account the stock splits effected in September 1995 and August 1996):
 
    (i) Since January  1994, the  Registrant has  granted stock  options to  its
employees under its stock option plans covering an aggregate of 3,595,198 shares
of  the  Registrant's Common  Stock, at  exercise prices  ranging from  $0.25 to
$59.625 per share.  The Registrant has  issued 206,393 shares  upon exercise  of
these stock options.
 
    (ii)  In March and May 1994, the  Registrant issued and sold an aggregate of
3,200,000 shares of Series C Preferred Stock (convertible into 3,508,988  shares
of Common Stock) at $2.50 per share to 31 investors, and warrants to purchase an
aggregate  of  600,000  shares of  Common  Stock  at $0.25  per  share  to three
investors, and warrants to purchase an  aggregate of 5,019,520 shares of  Common
Stock at $1.165 per share to 31 investors.
 
   (iii)  In  October  1994, the  Registrant  issued  and sold  an  aggregate of
2,080,000 shares of Series D Preferred Stock (convertible into 2,280,844  shares
of Common Stock) at $3.125 per share to 13 investors.
 
    (iv)  In May 1995,  the Registrant issued  and sold an  aggregate of 563,600
shares of Common Stock at $0.3125 per share to Donald Green, James Hoeck,  Henri
Sulzer  and John Webley pursuant to a restricted stock issuance program approved
by the Company's Board of Directors.
 
    (v) In  September 1995,  the  Registrant issued  and  sold an  aggregate  of
2,193,540  shares of Series E Preferred Stock (convertible into 2,249,014 shares
of Common Stock) at $7.00 per share to 10 investors, and warrants to purchase an
aggregate of 30,068 shares  of Common Stock  at $7.00 per  share to Hambrecht  &
Quist, L.P.
 
    (vi)  In April 1996, the Registrant issued  and sold an aggregate of 220,000
shares of Series F  Preferred Stock (convertible into  220,000 shares of  Common
Stock)  at an effective price of $7.00 per share to Elec and Eltek Communication
Holdings Limited. The Registrant purchased all  of the stock of AFTEK-Hong  Kong
that  had not previously  been owned by  the Registrant in  exchange for 220,000
shares of such shares of Series F Preferred Stock and approximately $939,000  in
cash.
 
   (vii)  Between January 1994  and January 1997, the  Registrant has issued and
sold  3,970,427  shares  of  Common  Stock  upon  exercise  of  warrants  to  39
individuals.
 
                                      II-2
<PAGE>
    The  sales and issuances  of securities in  the transactions described above
were deemed to be exempt from registration under the Securities Act in  reliance
upon Section 4(2) of the Securities Act, or Regulation D promulgated thereunder,
or   Rule  701  promulgated  under  Section  3(b)  of  the  Securities  Act,  as
transactions by  an issuer  not involving  any public  offering or  transactions
pursuant  to compensatory benefit plans  and contracts relating to compensations
as  provided  under  Rule  701.  The  recipients  of  securities  in  each  such
transaction   represented  their  intentions  to   acquire  the  securities  for
investments only and  not with  a view  to or for  sale in  connection with  any
distribution  thereof  and appropriate  legends were  affixed to  the securities
issued in such transactions. All  recipients had adequate access, through  their
relationships with the Company, to information about the Registrant.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (a) Exhibits
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
 
      1.1  Form of Underwriting Agreement.
      3.3  Fourth Amended and Restated Certificate of Incorporation of the Registrant.*
      3.5  Amended and Restated Bylaws of the Registrant.*
      4.1  Specimen Certificate of Common Stock.*
      4.2  Series E Preferred Stock Purchase Agreement, dated September 29, 1995, between the Registrant and
           certain purchasers of the Registrant's Series E Preferred Stock.*
      4.3  Certificate of Incorporation of the Registrant (included in Exhibit 3.1).*
      5.1  Opinion of Brobeck, Phleger & Harrison LLP.
     10.1  Form of Warrant Issued In Connection with the Sale of the Registrant's Series A Preferred Stock on
           January 6, 1993.*
     10.2  Form of Warrant Issued In Connection with the Sale of the Registrant's Series B Preferred Stock on
           October 5, 1993.*
     10.3  Form of Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred Stock on March
           16, 1994.*
     10.4  Form of Performance Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred
           Stock on March 16, 1994 and May 4, 1994.*
   10.4.1  Form of Amendment to Warrants and Performance Warrants.*
     10.5  Warrant Issued in Connection with the Sale of the Registrant's Series E Preferred Stock on September 29,
           1995.*
     10.6  Restricted Stock Issuance Agreement, dated May 19, 1995, between the Registrant, Donald Green and
           Maureen Green.*
     10.7  Compensation Agreement, dated May 19, 1995, between the Registrant and Donald Green.*
     10.8  Promissory Note Secured by Pledge Agreement, dated May 31, 1995, by Donald Green in favor of the
           Registrant.*
     10.9  Stock Pledge Agreement, dated June 16, 1995, between the Registrant and Donald Green.*
    10.10  Promissory Note issued by Carl Grivner, dated October 5, 1995, in favor of the Registrant.*
    10.11  Shareholder and Joint Venture Agreement, dated December 28, 1995, between the Registrant and Harris
           Corporation, acting for the purposes of the agreement through its Digital Telephone Systems Division.*+
    10.12  Joint Venture & Partnership Agreement, dated April 11, 1994, between the Registrant and Tellabs
           Operations, Inc.*+
    10.13  License, Joint Development, Supply and Authorized Manufacturing Agreement, dated September 25, 1992,
           between the Registrant and Industrial Technology Research Institute of the Republic of China.*+
    10.14  Hangzhou Aftek Communication Registrant Ltd. Contract, dated June 18, 1994, between Advanced Fibre
           Technology Communication (Hong Kong) Limited and Hangzhou Communication Equipment Factory of the MPT.,
           HuaTong Branch.*+
</TABLE>
 
                                      II-3
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
    10.15  1445 & 1455 McDowell Boulevard North Net Lease, dated February 1, 1993, between the Registrant and G &
           W/ Redwood Associates Joint Venture, for the premises located at 1445 McDowell Boulevard North.*
    10.16  Redwood Business Park Net Lease, dated July 9, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1455 McDowell Boulevard North.*
    10.17  Redwood Business Park Net Lease, dated July 10, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1440 McDowell Boulevard North.*
    10.18  Redwood Business Park Net Lease, dated June 3, 1996, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at Buildings 1 & 9 of Willowbrook Court.*
    10.19  Second Amended and Restated Loan and Security Agreement, dated December 7, 1995, between the Registrant
           and Bank of the West.*
    10.20  Form of Indemnification Agreement for Executive Officers and Directors of the Registrant.*
    10.21  The Registrant's 1993 Stock Option/Stock Issuance Plan as amended (the ``1993 Plan").*
    10.22  Form of Stock Option Agreement pertaining to the 1993 Plan.*
    10.23  Form of Notice of Grant of Stock Option pertaining to the 1993 Plan.*
    10.24  Form of Stock Purchase Agreement pertaining to the 1993 Plan.*
    10.25  The Registrant's 1996 Stock Incentive Plan (the ``1996 Plan").*
    10.26  Form of Stock Option Agreement pertaining to the 1996 Plan.*
  10.26.1  Form of Automatic Stock Option Agreement pertaining to the 1996 Plan.*
    10.27  Form of Notice of Grant of Stock Option pertaining to the 1996 Plan.*
  10.27.1  Form of Notice of Grant of Non-Employee Director Automatic Stock Option pertaining to the 1996 Plan.*
    10.28  Form of Stock Issuance Agreement pertaining to the 1996 Plan.*
    10.29  The Registrant's Employee Stock Purchase Plan.*
    10.30  Termination Agreement of Joint Venture and Partnership Agreement, dated December 23, 1996, between the
           Registrant and Tellabs Operations, Inc.
    10.31  License and Marketing Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations,
           Inc.++
    10.32  OEM Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations, Inc.
     11.1  Statement regarding computation of per share earnings.
     21.1  Subsidiaries of the Registrant.*
     23.1  Consent of KPMG Peat Marwick LLP, Independent Auditors.
     23.2  Consent of Brobeck, Phleger & Harrison LLP (included in Exhibit 5.1).
     24.1  Power of Attorney (see page II-6).
     27.1  Financial Data Schedule
</TABLE>
 
- ---------
*    Incorporated  by reference from the  Registrant's Registration Statement on
    Form S-1 (no. 333-8921) filed with the Securities and Exchange Commission on
    July 26, 1996, as amended, and declared effective September 30, 1996.
 
+   Portions of this Exhibit have been granted Confidential Treatment.
 
++   Portions of  this Exhibit  have  been deleted  pursuant to  a  Confidential
    Treatment Request filed with the Commission.
 
                                      II-4
<PAGE>
ITEM 17. UNDERTAKINGS
 
    The  undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing  specified in  the Underwriting Agreement,  certificates in  such
denominations  and registered in  such names as required  by the Underwriters to
permit prompt delivery to each purchaser.
 
    Insofar as indemnification for liabilities arising under the Securities  Act
may  be  permitted  to  directors,  officers  and  controlling  persons  of  the
Registrant pursuant to the Delaware General Corporation Law, the certificate  of
incorporation  or the  bylaws of Registrant,  Indemnification Agreements entered
into between  the Registrant  and its  directors and  certain of  its  officers,
Underwriting  Agreement, or otherwise,  the Registrant has  been advised that in
the opinion of the  Securities and Exchange  Commission such indemnification  is
against  public policy  as expressed in  the Securities Act,  and is, therefore,
unenforceable. In  the  event that  a  claim for  indemnification  against  such
liabilities  (other than the  payment by the Registrant  of expenses incurred or
paid by  a director,  officer or  controlling person  of the  Registrant in  the
successful  defense  of any  action,  suit or  proceeding)  is asserted  by such
director, officer or controlling person in connection with the securities  being
registered  hereunder, the Registrant will, unless in the opinion of its counsel
the matter  has been  settled by  controlling precedent,  submit to  a court  of
appropriate  jurisdiction  the question  whether such  indemnification by  it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
    The undersigned Registrant hereby undertakes that:
 
        (1) For purposes of determining any liability under the Securities  Act,
    the  information omitted from the  form of Prospectus filed  as part of this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    Prospectus filed by  the Registrant  pursuant to  Rule 424(b)(1)  or (4)  or
    497(h)  under  the  Securities  Act  shall be  deemed  to  be  part  of this
    Registration Statement as of the time it was declared effective.
 
        (2) For the purpose  of determining any  liability under the  Securities
    Act,  each post-effective amendment that contains a form of Prospectus shall
    be deemed to  be a  new Registration  Statement relating  to the  securities
    offered  therein, and the offering of such  securities at that time shall be
    deemed to be the initial BONA FIDE offering thereof.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
    PURSUANT  TO THE REQUIREMENTS OF THE  SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS REGISTRATION  STATEMENT TO BE SIGNED  ON ITS BEHALF BY  THE
UNDERSIGNED,  THEREUNTO  DULY  AUTHORIZED, IN  THE  CITY OF  PETALUMA,  STATE OF
CALIFORNIA, ON THIS 24TH DAY OF JANUARY, 1997.
 
                                       ADVANCED FIBRE COMMUNICATIONS, INC.
 
                                       By          /S/ DONALD GREEN
                                         ---------------------------------------
                                                    Donald Green
                                              CHAIRMAN OF THE BOARD AND
                                               CHIEF EXECUTIVE OFFICER
 
                               POWER OF ATTORNEY
 
    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints  jointly and severally, Donald  Green and Dan  E.
Steimle,  and each one  of them, his  attorneys-in-fact, each with  the power of
substitution, for him in any and all capacities, to sign any and all  amendments
to  this Registration Statement  and to sign any  registration statement for the
same offering covered  by this Registration  Statement that is  to be  effective
upon  filing pursuant  to Rule  462(b) promulgated  under the  Securities Act of
1933, and all post-effective amendments thereto, and to file the same, with  all
exhibits  thereto and all documents in connection therewith, with the Securities
and Exchange Commission,  granting unto said  attorneys-in-fact and agents,  and
each  of them, full power and authority to do and perform each and every act and
thing requisite and necessary to be done in and about the premises, as fully  to
all intents and purposes as he might or could do in person, hereby ratifying and
confirming that each of said attorneys-in-fact and agents or any of them, or his
or  their substitute  or substitutes,  may lawfully  do or  cause to  be done by
virtue hereof.
 
    PURSUANT  TO  THE  REQUIREMENTS  OF   THE  SECURITIES  ACT  OF  1933,   THIS
REGISTRATION  STATEMENT  HAS  BEEN  SIGNED  BY  THE  FOLLOWING  PERSONS  IN  THE
CAPACITIES AND ON THE DATES INDICATED:
 
<TABLE>
<CAPTION>
               SIGNATURE                                         TITLE                                    DATE
- ---------------------------------------  ------------------------------------------------------  ----------------------
 
<C>                                      <S>                                                     <C>
           /S/ DONALD GREEN
    -------------------------------      Chairman of the Board and Chief Executive Officer          January 24, 1997
             Donald Green                 (principal executive officer)
 
          /S/ CARL J. GRIVNER
    -------------------------------      President, Chief Operating Officer and Director            January 24, 1997
            Carl J. Grivner
 
          /S/ DAN E. STEIMLE             Vice President, Chief Financial Officer, Treasurer and
    -------------------------------       Secretary (principal financial and accounting             January 24, 1997
            Dan E. Steimle                officer)
 
            /S/ B.J. CASSIN
    -------------------------------      Director                                                   January 24, 1997
              B.J. Cassin
 
       /S/ CLIFFORD H. HIGGERSON
    -------------------------------      Director                                                   January 24, 1997
         Clifford H. Higgerson
 
           /S/ BRIAN JACKMAN
    -------------------------------      Director                                                   January 24, 1997
             Brian Jackman
 
            /S/ DAN RASDAL
    -------------------------------      Director                                                   January 24, 1997
              Dan Rasdal
</TABLE>
 
                                      II-6
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
 
      1.1  Form of Underwriting Agreement.
      3.3  Fourth Amended and Restated Certificate of Incorporation of the Registrant.*
      3.5  Amended and Restated Bylaws of the Registrant.*
      4.1  Specimen Certificate of Common Stock.*
      4.2  Series E Preferred Stock Purchase Agreement, dated September 29, 1995, between the Registrant and
           certain purchasers of the Registrant's Series E Preferred Stock.*
      4.3  Certificate of Incorporation of the Registrant (included in Exhibit 3.1).*
      5.1  Opinion of Brobeck, Phleger & Harrison LLP.
     10.1  Form of Warrant Issued In Connection with the Sale of the Registrant's Series A Preferred Stock on
           January 6, 1993.*
     10.2  Form of Warrant Issued In Connection with the Sale of the Registrant's Series B Preferred Stock on
           October 5, 1993.*
     10.3  Form of Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred Stock on March
           16, 1994.*
     10.4  Form of Performance Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred
           Stock on March 16, 1994 and May 4, 1994.*
   10.4.1  Form of Amendment to Warrants and Performance Warrants.*
     10.5  Warrant Issued in Connection with the Sale of the Registrant's Series E Preferred Stock on September 29,
           1995.*
     10.6  Restricted Stock Issuance Agreement, dated May 19, 1995, between the Registrant, Donald Green and
           Maureen Green.*
     10.7  Compensation Agreement, dated May 19, 1995, between the Registrant and Donald Green.*
     10.8  Promissory Note Secured by Pledge Agreement, dated May 31, 1995, by Donald Green in favor of the
           Registrant.*
     10.9  Stock Pledge Agreement, dated June 16, 1995, between the Registrant and Donald Green.*
    10.10  Promissory Note issued by Carl Grivner, dated October 5, 1995, in favor of the Registrant.*
    10.11  Shareholder and Joint Venture Agreement, dated December 28, 1995, between the Registrant and Harris
           Corporation, acting for the purposes of the agreement through its Digital Telephone Systems Division.*+
    10.12  Joint Venture & Partnership Agreement, dated April 11, 1994, between the Registrant and Tellabs
           Operations, Inc.*+
    10.13  License, Joint Development, Supply and Authorized Manufacturing Agreement, dated September 25, 1992,
           between the Registrant and Industrial Technology Research Institute of the Republic of China.*+
    10.14  Hangzhou Aftek Communication Registrant Ltd. Contract, dated June 18, 1994, between Advanced Fibre
           Technology Communication (Hong Kong) Limited and Hangzhou Communication Equipment Factory of the MPT.,
           HuaTong Branch.*+
    10.15  1445 & 1455 McDowell Boulevard North Net Lease, dated February 1, 1993, between the Registrant and G &
           W/ Redwood Associates Joint Venture, for the premises located at 1445 McDowell Boulevard North.*
    10.16  Redwood Business Park Net Lease, dated July 9, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1455 McDowell Boulevard North.*
    10.17  Redwood Business Park Net Lease, dated July 10, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1440 McDowell Boulevard North.*
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
    10.18  Redwood Business Park Net Lease, dated June 3, 1996, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at Buildings 1 & 9 of Willowbrook Court.*
    10.19  Second Amended and Restated Loan and Security Agreement, dated December 7, 1995, between the Registrant
           and Bank of the West.*
    10.20  Form of Indemnification Agreement for Executive Officers and Directors of the Registrant.*
    10.21  The Registrant's 1993 Stock Option/Stock Issuance Plan as amended (the ``1993 Plan").*
    10.22  Form of Stock Option Agreement pertaining to the 1993 Plan.*
    10.23  Form of Notice of Grant of Stock Option pertaining to the 1993 Plan.*
    10.24  Form of Stock Purchase Agreement pertaining to the 1993 Plan.*
    10.25  The Registrant's 1996 Stock Incentive Plan (the ``1996 Plan").*
    10.26  Form of Stock Option Agreement pertaining to the 1996 Plan.*
  10.26.1  Form of Automatic Stock Option Agreement pertaining to the 1996 Plan.*
    10.27  Form of Notice of Grant of Stock Option pertaining to the 1996 Plan.*
  10.27.1  Form of Notice of Grant of Non-Employee Director Automatic Stock Option pertaining to the 1996 Plan.*
    10.28  Form of Stock Issuance Agreement pertaining to the 1996 Plan.*
    10.29  The Registrant's Employee Stock Purchase Plan.*
    10.30  Termination Agreement of Joint Venture and Partnership Agreement, dated December 23, 1996, between the
           Registrant and Tellabs Operations, Inc.
    10.31  License and Marketing Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations,
           Inc.++
    10.32  OEM Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations, Inc.
     11.1  Statement regarding computation of per share earnings.
     21.1  Subsidiaries of the Registrant.*
     23.1  Consent of KPMG Peat Marwick LLP, Independent Auditors.
     23.2  Consent of Brobeck, Phleger & Harrison LLP (included in Exhibit 5.1).
     24.1  Power of Attorney (see page II-6).
     27.1  Financial Data Schedule
</TABLE>
 
- ---------
*    Incorporated  by reference from the  Registrant's Registration Statement on
    Form S-1 (no. 333-8921) filed with the Securities and Exchange Commission on
    July 26, 1996, as amended, and declared effective September 30, 1996.
 
+   Portions of this Exhibit have been granted Confidential Treatment.
 
++   Portions of  this Exhibit  have  been deleted  pursuant to  a  Confidential
    Treatment Request filed with the Commission.

<PAGE>




                                2,600,000 Shares


                       ADVANCED FIBRE COMMUNICATIONS, INC.

                     Common Stock, par value $.01 per share




                             UNDERWRITING AGREEMENT




_____________, 1997


<PAGE>

                                                              ____________, 1997



Morgan Stanley & Co. Incorporated
Merrill Lynch, Pierce, Fenner & Smith
                    Incorporated
Cowen & Company
Hambrecht & Quist LLC
c/o Morgan Stanley & Co. Incorporated
    1585 Broadway
    New York, New York  10036

Morgan Stanley & Co. International Limited
Merrill Lynch International
Cowen & Company
Hambrecht & Quist LLC
c/o Morgan Stanley & Co. International Limited
    25 Cabot Square
    Canary Wharf
    London E14 4QA
    England, United Kingdom

Dear Sirs and Mesdames:

     Advanced Fibre Communications, Inc., a Delaware corporation (the
"Company"), proposes to issue and sell to the several Underwriters named in
Schedule II and Schedule III hereto (the "Underwriters"), and certain
stockholders of the Company (the "Selling Stockholders") named in Schedule I
hereto severally propose to sell to the several Underwriters, an aggregate of
2,600,000 shares of the Common Stock, par value $.01 per share, of the Company
(the "Firm Shares"), of which 200,000 shares are to be issued and sold by the
Company and 2,400,000 shares are to be sold by the Selling Stockholders, each
Selling Stockholder selling the amount set forth opposite such Selling
Stockholder's name in Schedule I hereto.

     It is understood that, subject to the conditions hereinafter stated,
2,080,000 Firm Shares (the "U.S. Firm Shares") will be sold to the several U.S.
Underwriters named in Schedule II hereto (the "U.S. Underwriters") in connection
with the offering and sale of such U.S. Firm Shares in the United States and
Canada to United States and Canadian Persons (as such terms are defined in the
Agreement Between U.S. and International Underwriters of even date herewith),
and 520,000 Firm Shares (the "International Shares") will be sold to the several
International Underwriters named in Schedule III hereto (the "International
Underwriters") in connection with the offering and sale of such International
Shares outside the United States and Canada to persons other than United States
and Canadian Persons.  Morgan Stanley & Co. Incorporated, Merrill Lynch, Pierce,
Fenner & Smith

<PAGE>

Incorporated, Cowen & Company and Hambrecht & Quist LLC shall act as
representatives (the "U.S. Representatives") of the several U.S. Underwriters,
and Morgan Stanley & Co. International Limited, Merrill Lynch International,
Cowen & Company and Hambrecht & Quist LLC shall act as representatives (the
"International Representatives") of the several International Underwriters.

     The Selling Stockholders also propose to sell to the several U.S.
Underwriters not more than an additional 390,000 shares of the Common Stock, par
value $.01 per share, of the Company (the "Additional Shares"), if and to the
extent that the U.S. Representatives shall have determined to exercise, on
behalf of the U.S. Underwriters, the right to purchase such shares of Common
Stock granted to the U.S. Underwriters in Section 2 hereof.  The Firm Shares and
the Additional Shares are hereinafter collectively referred to as the "Shares."
The shares of Common Stock, par value $.01 per share, of the Company to be
outstanding after giving effect to the sales contemplated hereby are hereinafter
referred to as the "Common Stock."  The Company and the Selling Stockholders are
hereinafter sometimes collectively referred to as the "Sellers."

     The Company has filed with the Securities and Exchange Commission (the
"Commission") a registration statement relating to the Shares.  The registration
statement contains two prospectuses to be used in connection with the offering
and sale of the Shares:  the U.S. prospectus, to be used in connection with the
offering and sale of the U.S. Firm Shares and the Additional Shares in the
United States and Canada to United States and Canadian Persons, and the
international prospectus, to be used in connection with the offering and sale of
the International Shares outside the United States and Canada to persons other
than United States and Canadian Persons.  The international prospectus is
identical to the U.S. prospectus except for the outside front cover page.  The
registration statement as amended at the time it becomes effective, including
the information (if any) deemed to be part of the registration statement at the
time of effectiveness pursuant to Rule 430A under the Securities Act of 1933, as
amended (the "Securities Act"), is hereinafter referred to as the "Registration
Statement"; the U.S. prospectus and the international prospectus in the
respective forms first used to confirm sales of Shares are hereinafter referred
to as the "Prospectus."  If the Company has filed an abbreviated registration
statement to register additional shares of Common Stock pursuant to Rule 462(b)
under the Securities Act (the "Rule 462 Registration Statement"), then any
reference herein to the term "Registration Statement" shall be deemed to include
such Rule 462 Registration Statement.

     Unless the context otherwise requires, all representations and warranties
of the Company herein shall also be deemed to be representations and warranties
with respect to all predecessor entities of the Company.

     1.   REPRESENTATIONS AND WARRANTIES.  The Company represents and warrants
to and agrees with each of the Underwriters that:

          (a)  The Registration Statement has become effective; no stop order
     suspending the effectiveness of the Registration Statement is in effect,
     and no proceedings for such purpose are pending before or, to the Company's
     knowledge, threatened by the Commission.

                                       -2-
<PAGE>

          (b)  (i)  The Registration Statement, when it became effective, did
     not contain and, as amended or supplemented, if applicable, will not
     contain any untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading, (ii) the Registration Statement and the Prospectus
     comply and, as amended or supplemented, if applicable, will comply in all
     material respects with the Securities Act and the applicable rules and
     regulations of the Commission thereunder and (iii) the Prospectus does not
     contain and, as amended or supplemented, if applicable, will not contain
     any untrue statement of a material fact or omit to state a material fact
     necessary to make the statements therein, in the light of the circumstances
     under which they were made, not misleading, except that the representations
     and warranties set forth in this paragraph 1(b) do not apply to statements
     or omissions in the Registration Statement or the Prospectus based upon
     information relating to any Underwriter furnished to the Company in writing
     by such Underwriter through you expressly for use therein.

          (c)  The Company has been duly incorporated, is validly existing as a
     corporation in good standing under the laws of the State of Delaware, has
     the corporate power and authority to own its property and to conduct its
     business as described in the Prospectus and is duly qualified to transact
     business and is in good standing in each jurisdiction in which the conduct
     of its business or its ownership or leasing of property requires such
     qualification, except to the extent that the failure to be so qualified or
     be in good standing would not have a material adverse effect on the Company
     and its Significant Subsidiaries, as that term is defined in Rule 1-02(w)
     of Regulation S-X (each a "Subsidiary" and collectively "Subsidiaries"),
     taken as a whole.

          (d)  Each Subsidiary of the Company, foreign and domestic, has been
     duly incorporated, is validly existing as a corporation in good standing
     under the laws of the jurisdiction of its incorporation, has the corporate
     power and authority to own its property and to conduct its business as
     described in the Prospectus and is duly qualified to transact business and
     is in good standing in each jurisdiction in which the conduct of its
     business or its ownership or leasing of property requires such
     qualification, except to the extent that the failure to be so qualified or
     be in good standing would not have a material adverse effect on the Company
     and its Subsidiaries, taken as a whole.  All of the outstanding shares of
     capital stock of each Subsidiary of the Company have been duly authorized
     and are validly issued, fully paid and non-assessable and are owned
     directly (other than directors' qualifying shares) by the Company, free and
     clear of any security interest, lien, encumbrance, equity, claim or adverse
     interest of any nature.

          (e)  The Company and its Subsidiaries have good and marketable title
     in fee simple to all real property and good and marketable title to all
     personal property owned by them that is material to the business of the
     Company and its Subsidiaries, in each case free and clear of any security
     interest, lien, encumbrance, claim, defect or adverse interest of any
     nature except such as are described in the Prospectus or such as do not
     materially affect the value of such property and do not interfere with the
     use made and proposed to be made of such property by the Company and its
     Subsidiaries; and any real property and buildings held under lease by the

                                       -3-
<PAGE>

     Company and its Subsidiaries are held by them under valid, subsisting and
     enforceable leases with such exceptions as are not material and do not
     interfere with the use made and proposed to be made of such property and
     buildings by the Company and its Subsidiaries, in each case except as
     described in or contemplated by the Prospectus.

          (f)  The authorized capital stock of the Company conforms as to legal
     matters to the description thereof contained in the Prospectus.

          (g)  The shares of Common Stock (including the Shares to be sold by
     the Selling Stockholders) outstanding prior to the issuance of the Shares
     have been duly authorized and are validly issued, fully paid and non-
     assessable.  Except as set forth in the Prospectus, neither the Company nor
     any Subsidiary has outstanding any options to purchase, or any preemptive
     rights or other rights to subscribe for or to purchase, any securities or
     obligations convertible into, or any contracts or commitments to issue or
     sell, shares of its capital stock or any such options, rights, convertible
     securities or obligations.  All outstanding shares of capital stock and
     options and other rights to acquire capital stock have been issued in
     compliance with the registration and qualification provisions of all
     applicable securities laws and were not issued in violation of any
     preemptive rights, rights of first refusal or other similar rights.

          (h)  The Shares have been duly authorized and, when issued and
     delivered in accordance with the terms of this Agreement, will be validly
     issued, fully paid and non-assessable, and the issuance of such Shares will
     not be subject to any preemptive rights, rights of first refusal or similar
     rights.

          (i)  The Company has corporate power and authority to enter into this
     Agreement and to issue, sell and deliver to the Underwriters the Shares,
     and this Agreement has been duly authorized, executed and delivered by the
     Company.

          (j)  The execution and delivery by the Company of, and the performance
     by the Company of its obligations under, this Agreement will not contravene
     any provision of applicable law or the certificate of incorporation or
     bylaws of the Company or any Subsidiary, or any agreement or other
     instrument binding upon the Company or any of its Subsidiaries that is
     material to the Company and its Subsidiaries, taken as a whole, or any
     judgment, order or decree of any governmental body, agency or court having
     jurisdiction over the Company or any Subsidiary, and no consent, approval,
     authorization or order of, or qualification with, any governmental body or
     agency is required for the performance by the Company of its obligations
     under this Agreement, except such as may be required by the securities or
     Blue Sky laws of the various states and jurisdictions in connection with
     the offer and sale of the Shares.

          (k)  There has not occurred any material adverse change, or any
     development involving a prospective material adverse change, in the
     condition, financial or otherwise, or in the earnings, business or
     operations of the Company and its Subsidiaries, taken as a whole, from that
     set forth in the Prospectus.

                                       -4-
<PAGE>

          (l)  Subsequent to the respective dates as of which information is
     given in the Registration Statement and the Prospectus, (i) the Company and
     its Subsidiaries have not incurred any material liability or obligation,
     direct or contingent, nor entered into any material transaction not in the
     ordinary course of business; (ii) the Company has not purchased any of its
     outstanding capital stock, nor declared, paid or otherwise made any
     dividend or distribution of any kind on its capital stock other than
     ordinary and customary dividends; and (iii) there has not been any material
     change in the capital stock, short-term debt or long-term debt of the
     Company and its consolidated Subsidiaries, except in each case as described
     in or contemplated by the Prospectus.

          (m)  There are no legal, regulatory or governmental proceedings
     pending or, to the Company's knowledge, threatened to which the Company or
     any of its Subsidiaries is a party or to which any of the properties of the
     Company or any of its Subsidiaries is subject that are required to be
     described in the Registration Statement or the Prospectus and are not so
     described or any statutes, regulations, contracts or other documents that
     are required to be described in the Registration Statement or the
     Prospectus or to be filed as exhibits to the Registration Statement that
     are not described or filed as required.

          (n)  Each of the Company and its Subsidiaries has all necessary
     consents, authorizations, approvals, orders, certificates and permits of
     and from, and has made all declarations and filings with, all foreign,
     federal, state, local and other governmental authorities, all
     self-regulatory organizations and all courts and other tribunals, to own,
     lease, license and use its properties and assets and to conduct its
     business in the manner described in the Prospectus, except to the extent
     that the failure to obtain or file would not, singly or in the aggregate,
     have a material adverse effect on the Company and its Subsidiaries, taken
     as a whole; and neither the Company nor any such Subsidiary has received
     any notice of proceedings related to the revocation or modification of any
     such consent, authorization, approval, order, certificate or permit which,
     singly or in the aggregate, if the subject of any unfavorable decision,
     ruling or finding, would result in a material adverse change in the
     condition, financial or otherwise, or in the earnings, business or
     operations of the Company and its Subsidiaries, taken as a whole, except as
     described in or contemplated by the Prospectus.

          (o)  Each preliminary prospectus filed as part of the registration
     statement as originally filed or as part of any amendment thereto, or filed
     pursuant to Rule 424 under the Securities Act, complied when so filed in
     all material respects with the Securities Act and the applicable rules and
     regulations of the Commission thereunder.

          (p)  The Company is not and, after giving effect to the offering and
     sale of the Shares and the application of the proceeds thereof as described
     in the Prospectus, will not be an "investment company" as such term is
     defined in the Investment Company Act of 1940, as amended.

                                       -5-
<PAGE>

          (q)  There is no legal or beneficial owner of any securities of the
     Company who has any rights, not effectively satisfied or waived, to require
     registration of any shares of capital stock of the Company in connection
     with the filing of the Registration Statement.

          (r)  The Company and each of its Subsidiaries are insured by insurers
     of recognized financial responsibility against such losses and risks and in
     such amounts as are prudent and customary in the businesses in which they
     are engaged; neither the Company nor any such Subsidiary has been refused
     any insurance coverage sought or applied for; and neither the Company nor
     any such Subsidiary has any reason to believe that it will not be able to
     renew its existing insurance coverage as and when such coverage expires or
     to obtain similar coverage from similar insurers as may be necessary to
     continue its business at a cost that would not materially and adversely
     affect the condition, financial or otherwise, or the earnings, business or
     operations of the Company and its Subsidiaries, taken as a whole, except as
     described in or contemplated by the Prospectus.

          (s)  The Company and its Subsidiaries (i) are in compliance with any
     and all applicable foreign, federal, state and local laws and regulations
     (A) relating to the protection of human health and safety, the environment
     or hazardous or toxic substances or wastes, pollutants or contaminants
     (collectively, "Environmental Laws") and (B) relating to the manufacture
     and sale of telecommunications equipment, including without limitation the
     rules and regulations of the Federal Communications Commission,
     (collectively, "Telecommunications Laws"),  (ii) have received all permits,
     licenses or other approvals required of them under applicable Environmental
     Laws or Telecommunications Laws, as the case may be, to conduct their
     respective businesses and (iii) are in compliance with all terms and
     conditions of any such permit, license or approval, except where such
     noncompliance with Environmental Laws or Telecommunications Laws, as the
     case may be, failure to receive required permits, licenses or other
     approvals or failure to comply with the terms and conditions of such
     permits, licenses or approvals would not, singly or in the aggregate, have
     a material adverse effect on the Company and its Subsidiaries, taken as a
     whole.

          (t)  There are no costs or liabilities associated with Environmental
     Laws (including, without limitation, any capital or operating expenditures
     required for clean-up, closure of properties or compliance with
     Environmental Laws or any permit, license or approval, any related
     constraints on operating activities and any potential liabilities to third
     parties) which would, singly or in the aggregate, have a material adverse
     effect on the condition, financial or otherwise, or on the earnings,
     business or operations of the Company and its Subsidiaries, taken as a
     whole.

          (u)  The Company and each of its Subsidiaries owns or possesses
     adequate licenses or other rights to use all patents, patent rights,
     inventions, trade secrets, copyrights, trademarks, service marks, trade
     names, technology and know-how necessary to conduct its business in the
     manner described in the Prospectus and, except as disclosed in the
     Prospectus, neither the Company nor any of its Subsidiaries has received
     any notice of infringement or conflict with, or knows of any infringement
     or conflict with, asserted rights of others with

                                       -6-
<PAGE>

     respect to any patents, patent rights, inventions, trade secrets,
     copyrights, trademarks, service marks, trade names, technology or know-how
     which could result in any material adverse effect upon the Company and its
     Subsidiaries, taken as a whole; and, except as disclosed in the Prospectus,
     the discoveries, inventions, products or processes of the Company and its
     Subsidiaries referred to in the Prospectus do not, to the best knowledge of
     the Company or any of its Subsidiaries, infringe or conflict with any right
     or patent of any third party, or any discovery, invention, product or
     process which is the subject of a patent application filed by any third
     party, known to the Company or any of its Subsidiaries which could have a
     material adverse effect on the Company and its Subsidiaries, taken as a
     whole.

          (v)  The Company and each of its Subsidiaries maintain a system of
     internal accounting controls sufficient to provide reasonable assurance
     that (i) transactions are executed in accordance with management's general
     or specific authorizations; (ii) transactions are recorded as necessary to
     permit preparation of financial statements in conformity with generally
     accepted accounting principles and to maintain asset accountability;
     (iii) access to assets is permitted only in accordance with management's
     general or specific authorization; and (iv) the recorded accountability for
     assets is compared with the existing assets at reasonable intervals and
     appropriate action is taken with respect to any differences.

          (w)  No material labor dispute with the employees of the Company or
     any of its Subsidiaries exists, except as described in or contemplated by
     the Prospectus, or, to the best knowledge of the Company, is imminent; and
     the Company is not aware of any existing, threatened or imminent labor
     disturbance by the employees of any of its principal suppliers,
     manufacturers or contractors that could result in a material adverse change
     in the condition, financial or otherwise, or in the earnings, business or
     operations of the Company and its Subsidiaries, taken as a whole.

          (x)  An aggregate of at least _________________ outstanding shares of
     Common Stock, and securities convertible into or exercisable or
     exchangeable for at least _________ shares of Common Stock, are subject to
     valid, binding and enforceable agreements (collectively, the "Lock-up
     Agreements") that restrict the holders thereof from selling, making any
     short sale of, granting any option for the purchase of, or otherwise
     transferring or disposing of, any of such shares of Common Stock, or any
     such securities convertible into or exercisable or exchangeable for Common
     Stock, for a period of 90 days after the date of the Prospectus without the
     prior written consent of the Company or Morgan Stanley & Co. Incorporated.

          (y)  The Common Stock has been approved for quotation on The Nasdaq
     National Market, subject only to official notice of issuance.

          (z)  The Company has complied with all provisions of Section 517.075,
     Florida Statutes relating to doing business with the Government of Cuba or
     with any person or affiliate located in Cuba.

                                       -7-
<PAGE>

     2.   REPRESENTATIONS AND WARRANTIES OF THE SELLING STOCKHOLDERS.  Each of
the Selling Stockholders represents and warrants to and agrees with each of the
Underwriters that:

          (a)  This Agreement has been duly authorized, executed and delivered
     by or on behalf of such Selling Stockholder.

          (b)  The execution and delivery by such Selling Stockholder of, and
     the performance by such Selling Stockholder of its obligations under, this
     Agreement, the Custody Agreement signed by such Selling Stockholder and
     _______________, as Custodian, relating to the deposit of the Shares to be
     sold by such Selling Stockholder (the "Custody Agreement") and the Power of
     Attorney appointing certain individuals as such Selling Stockholder's
     attorneys-in-fact to the extent set forth therein, relating to the
     transactions contemplated hereby and by the Registration Statement (the
     "Power of Attorney") will not contravene any provision of applicable law,
     or the certificate of incorporation or by-laws of such Selling Stockholder
     (if such Selling Stockholder is a corporation), or any agreement or other
     instrument binding upon such Selling Stockholder or any judgment, order or
     decree of any governmental body, agency or court having jurisdiction over
     such Selling Stockholder, and no consent, approval, authorization or order
     of, or qualification with, any governmental body or agency is required for
     the performance by such Selling Stockholder of its obligations under this
     Agreement or the Custody Agreement or Power of Attorney of such Selling
     Stockholder, except such as may be required by the securities or Blue Sky
     laws of the various states in connection with the offer and sale of the
     Shares.

          (c)  Such Selling Stockholder has, and on the Closing Date will have,
     valid title to the Shares to be sold by such Selling Stockholder and the
     legal right and power, and all authorization and approval required by law,
     to enter into this Agreement, the Custody Agreement and the Power of
     Attorney and to sell, transfer and deliver the Shares to be sold by such
     Selling Stockholder.

          (d)  The Shares to be sold by such Selling Stockholder pursuant to
     this Agreement have been duly authorized and are validly issued, fully paid
     and non-assessable.

          (e)  The Custody Agreement and the Power of Attorney have been duly
     authorized, executed and delivered by such Selling Stockholder and are
     valid and binding agreements of such Selling Stockholder.

          (f)  Delivery of the Shares to be sold by such Selling Stockholder
     pursuant to this Agreement will pass title to such Shares free and clear of
     any security interests, claims, liens, equities and other encumbrances.

          (g)  To the extent that any statements or omissions made in the
     Registration Statement, any preliminary prospectus, the Prospectus, or any
     amendment or supplement thereto, are made in reliance upon and in
     conformity with written information furnished to the Company by such
     Selling Stockholder expressly for use therein, (i) the Registration

                                       -8-
<PAGE>

     Statement, when it became effective, did not contain and, as amended or
     supplemented, if applicable, will not contain any untrue statement of a
     material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein not misleading, and
     (ii) the Prospectus does not contain and, as amended or supplemented, if
     applicable, will not contain any untrue statement of a material fact or
     omit to state a material fact necessary to make the statements therein, in
     the light of the circumstances under which they were made, not misleading.

     3.   AGREEMENTS TO SELL AND PURCHASE.  Each Seller, severally and not
jointly, hereby agrees to sell to the several Underwriters, and each
Underwriter, upon the basis of the representations and warranties herein
contained, but subject to the conditions hereinafter stated, agrees, severally
and not jointly, to purchase from the Sellers at $______ a share (the "Purchase
Price") the number of Firm Shares (subject to such adjustments to eliminate
fractional shares as you may determine) that bears the same proportion to the
number of Firm Shares to be sold by such Seller as the number of Firm Shares set
forth in Schedules II and III hereto opposite the name of such Underwriter bears
to the total number of Firm Shares.

     On the basis of the representations and warranties contained in this
Agreement, and subject to its terms and conditions, the Selling Stockholders
agree to sell to the U.S. Underwriters the Additional Shares, and the U.S.
Underwriters shall have a one-time right to purchase, severally and not jointly,
up to an aggregate 390,000 Additional Shares at the Purchase Price.  If the U.S.
Representatives, on behalf of the U.S. Underwriters, elect to exercise such
option, the U.S. Representatives shall so notify the Company and the attorney-
in-fact for the Selling Stockholders in writing not later than 30 days after the
date of this Agreement, which notice shall specify the number of Additional
Shares to be purchased by the U.S. Underwriters and the date on which such
shares are to be purchased.  Such date may be the same as the Closing Date (as
defined below) but not earlier than the Closing Date nor later than ten business
days after the date of such notice.  Additional Shares may be purchased as
provided in Section 4 hereof solely for the purpose of covering over-allotments
made in connection with the offering of the Firm Shares.  If any Additional
Shares are to be purchased, each Selling Stockholder agrees, severally and not
jointly, to sell to the U.S. Underwriters, and each U.S. Underwriter agrees,
severally and not jointly, to purchase the number of Additional Shares (subject
to such adjustments to eliminate fractional shares as the U.S. Representatives
may determine) that bears the same proportion to the total number of Additional
Shares to be sold by such Selling Stockholder as the number of U.S. Firm Shares
set forth in Schedule II hereto opposite the name of such U.S. Underwriter bears
to the total number of U.S. Firm Shares.  The Additional Shares to be purchased
by the U.S. Underwriters hereunder and the U.S. Firm Shares are hereinafter
collectively referred to as the "U.S. Shares."

     Each Seller hereby agrees that, without the prior written consent of Morgan
Stanley & Co. Incorporated on behalf of the Underwriters, it will not, during
the period ending 90 days after the date of the Prospectus, (i) 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 (ii) enter into any swap or

                                       -9-
<PAGE>

other arrangement that transfers to another, in whole or in part, any of the
economic consequences of ownership of the Common Stock, whether any such
transaction described in clause (i) or (ii) above is to be settled by delivery
of Common Stock or such other securities, in cash or otherwise.  The foregoing
sentence shall not apply to (A) the Shares to be sold hereunder or (B) the
issuance by the Company of shares of Common Stock upon the exercise of an option
or warrant or the conversion of a security outstanding on the date hereof of
which the Underwriters have been advised in writing.  In addition, each Selling
Stockholder, agrees that, without the prior written consent of Morgan Stanley &
Co. Incorporated on behalf of the Underwriters, it will not, during the period
ending 90 days after the date of the Prospectus, make any demand for, or
exercise any right with respect to, the registration of any shares of Common
Stock or any security convertible into or exercisable or exchangeable for Common
Stock.

     4.   TERMS OF PUBLIC OFFERING.  The Sellers are advised by you that the
Underwriters propose to make a public offering of their respective portions of
the Shares as soon after the Registration Statement and this Agreement have
become effective as in your judgment is advisable.  The Sellers are further
advised by you that the Shares are to be offered to the public initially at U.S.
$_________ a share (the "Public Offering Price") and to certain dealers selected
by you at a price that represents a concession not in excess of U.S. $_______ a
share under the Public Offering Price, and that any Underwriter may allow, and
such dealers may reallow, a concession, not in excess of U.S. $_______ a share,
to any Underwriter or to certain other dealers.

     Each U.S. Underwriter hereby makes to and with the Sellers the
representations and agreements of such U.S. Underwriter contained in the fifth
and sixth paragraphs of Article III of the Agreement Between U.S. and
International Underwriters of even date herewith.   Each International
Underwriter hereby makes to and with the Sellers the representations and
agreements of such International Underwriter contained in the seventh, eighth,
ninth, tenth and eleventh paragraphs of Article III of such Agreement Between
U.S. and International Underwriters.

     5.   PAYMENT AND DELIVERY.  In accordance with Rule 15c6-1 under the
Exchange Act (as hereinafter defined), payment for the Firm Shares shall be made
to each Seller in Federal or other funds immediately available in New York City
against delivery of such Firm Shares for the respective accounts of the several
Underwriters at 10:00 A.M., New York City time, on __________, 1997 or at such
other time on the same or such other date, not later than __________, 1997 as
shall be designated in writing by you.  The time and date of such payment are
hereinafter referred to as  the "Closing Date."

     Payment for any Additional Shares shall be made to each Selling Stockholder
in Federal or other funds immediately available in New York City against
delivery of such Additional Shares for the respective accounts of the several
Underwriters at 10:00 A.M., New York City time, on the date specified in the
notice described in Section 2 or at such other time on the same or on such other
date, in any event not later than __________, 1997  as shall be designated in
writing by you.  The time and date of such payment are hereinafter referred to
as the "Option Closing Date."


                                      -10-
<PAGE>

     Certificates for the Firm Shares and Additional Shares shall be in
definitive form and registered in such names and in such denominations as you
shall request in writing not later than one full business day prior to the
Closing Date or the Option Closing Date, as the case may be.  The certificates
evidencing the Firm Shares and Additional Shares shall be delivered to you on
the Closing Date or the Option Closing Date, as the case may be, for the
respective accounts of the several Underwriters, with any transfer taxes payable
in connection with the transfer of the Shares to the Underwriters duly paid,
against payment of the Purchase Price therefor.

     6.   CONDITIONS TO THE UNDERWRITERS' OBLIGATIONS.  The obligations of the
Sellers to sell the Shares to the Underwriters and the several obligations of
the Underwriters to purchase and pay for the Shares on the Closing Date are
subject to the condition that the Registration Statement shall have become
effective not later than 2:00 P.M.  (New York City time) on the date hereof.

     The several obligations of the Underwriters are subject to the following
further conditions:

          (a)  Subsequent to the execution and delivery of this Agreement and
     prior to the Closing Date:

                    (i)  there shall not have occurred any downgrading, nor
          shall any notice have been given of any intended or potential
          downgrading or of any review for a possible change that does not
          indicate the direction of the possible change, in the rating accorded
          any of the Company's securities by any "nationally recognized
          statistical rating organization," as such term is defined for purposes
          of Rule 436(g)(2) under the Securities Act, and

                   (ii)  there shall not have occurred any change, or any
          development involving a prospective change, in the condition,
          financial or otherwise, or in the earnings, business or operations, of
          the Company and its Subsidiaries, taken as a whole, from that set
          forth in the Prospectus that, in your judgment, is material and
          adverse and that makes it, in your judgment, impracticable to market
          the Shares on the terms and in the manner contemplated in the
          Prospectus.

          (b)  The Underwriters shall have received on the Closing Date a
     certificate, dated the Closing Date and signed by an executive officer of
     the Company, to the effect set forth in clause (a)(i) above and to the
     effect that the representations and warranties of the Company contained in
     this Agreement are true and correct as of the Closing Date and that the
     Company has complied with all of the agreements and satisfied all of the
     conditions on its part to be performed or satisfied hereunder on or before
     the Closing Date.

          The officer signing and delivering such certificate may rely upon the
     best of his or her knowledge as to proceedings threatened.

          (c)  The Underwriters shall have received on the Closing Date, or the
     Option Closing Date, as the case may be, a certificate, dated the Closing
     Date, or the Option Closing

                                      -11-
<PAGE>

     Date, as the case may be, and signed by the Selling Stockholders (or by
     their attorney-in-fact on their behalf), to the effect that the
     representations and warranties of the Selling Stockholders contained in
     this Agreement are true and correct as of the Closing Date, or the Option
     Closing Date, as the case may be, and that each Selling Stockholder has
     complied with all of the agreements and satisfied all of the conditions on
     his part or her part to be performed or satisfied hereunder on or before
     the Closing Date, or the Option Closing Date, as the case may be.

          (d)  The Underwriters shall have received on the Closing Date an
     opinion of Brobeck, Phleger & Harrison LLP, outside counsel for the
     Company, dated the Closing Date, to the effect that:

                    (i)      the Company has been duly incorporated, is validly
          existing as a corporation in good standing under the laws of the State
          of Delaware, has the corporate power and authority to own its property
          and to conduct its business as described in the Prospectus and is duly
          qualified to transact business and is in good standing in each
          jurisdiction in which the conduct of its business or its ownership or
          leasing of property requires such qualification, except to the extent
          that the failure to be so qualified or be in good standing would not
          have a material adverse effect on the Company and its Subsidiaries,
          taken as a whole;

                   (ii)       each Subsidiary of the Company, foreign and
          domestic, has been duly incorporated, is validly existing as a
          corporation in good standing under the laws of the jurisdiction of its
          incorporation, has the corporate power and authority to own its
          property and to conduct its business as described in the Prospectus
          and is duly qualified to transact business and is in good standing in
          each jurisdiction in which the conduct of its business or its
          ownership or leasing of property requires such qualification, except
          to the extent that the failure to be so qualified or be in good
          standing would not have a material adverse effect on the Company and
          its Subsidiaries, taken as a whole;

                  (iii)       all of the outstanding shares of capital stock of
          each Subsidiary of the Company have been duly authorized and are
          validly issued, fully paid and non-assessable and are owned by the
          Company, free and clear of any security interest, lien, encumbrance,
          equity, claim or adverse interest of any nature;

                   (iv)       the authorized capital stock of the Company
          conforms as to legal matters to the description thereof contained in
          the Prospectus;

                    (v)       the shares of Common Stock (including the Shares
          to be sold by the Selling Stockholders) outstanding prior to the
          issuance of the Shares to be sold by the Company have been duly
          authorized and are validly issued, fully paid and non-assessable;
          except as set forth in the Prospectus, neither the Company nor any
          Subsidiary has outstanding any options to purchase, or any preemptive
          rights or other

                                      -12-
<PAGE>

          rights to subscribe for or to purchase, any securities or obligations
          convertible into, or any contracts or commitments to issue or sell,
          shares of its capital stock or any such options, rights, convertible
          securities or obligations; all outstanding shares of capital stock and
          options and other rights to acquire capital stock have been issued in
          compliance with the registration and qualification provisions of all
          applicable securities laws and were not issued in violation of any
          preemptive rights, rights of first refusal or other similar rights;

                   (vi)       the Shares to be sold by the Company have been
          duly authorized and, when issued and delivered in accordance with the
          terms of this Agreement, will be validly issued, fully paid and non-
          assessable, and the issuance of such Shares will not be subject to any
          preemptive rights, rights of first refusal or similar rights;

                   vii)       the Company has corporate power and authority to
          enter into this Agreement and to issue, sell and deliver to the
          Underwriters the Shares to be issued and sold by the Company, and this
          Agreement has been duly authorized, executed and delivered by the
          Company;

                 (viii)       the execution and delivery by the Company of, and
          the performance by the Company of its obligations under, this
          Agreement will not contravene any provision of applicable law or the
          certificate of incorporation or by-laws of the Company or any
          Subsidiary, or, to the best of such counsel's knowledge, any agreement
          or other instrument binding upon the Company or any of its
          Subsidiaries that is material to the Company and its Subsidiaries,
          taken as a whole, or, to the best of such counsel's knowledge, any
          judgment, order or decree of any governmental body, agency or court
          having jurisdiction over the Company or any Subsidiary, and no
          consent, approval, authorization or order of, or qualification with,
          any governmental body or agency is required for the performance by the
          Company of its obligations under this Agreement, except such as may be
          required by the securities or Blue Sky laws of the various states and
          jurisdictions in connection with the offer and sale of the Shares;

                   (ix)       the statements (A) in the Prospectus under the
          captions "Business--Proprietary Rights and Licenses," "Business--Legal
          Proceedings," "Certain Transactions," "Description of Capital Stock"
          and "Shares Eligible for Sale" and (B) in the Registration Statement
          in Items 14 and 15, in each case insofar as such statements constitute
          summaries of the legal matters, documents or proceedings referred to
          therein, fairly present in all material respects the information
          called for with respect to such legal matters, documents and
          proceedings and fairly summarize in all material respects the matters
          referred to therein;

                    (x)       after due inquiry, such counsel does not know of
          any legal, regulatory or governmental proceeding pending or threatened
          to which the Company

                                      -13-
<PAGE>

          or any of its Subsidiaries is a party or to which any of the
          properties of the Company or any of its Subsidiaries is subject that
          are required to be described in the Registration Statement or the
          Prospectus and are not so described or of any statutes, regulations,
          contracts or other documents that are required to be described in the
          Registration Statement or the Prospectus or to be filed as exhibits to
          the Registration Statement that are not described or filed as
          required;

                   (xi)       the Company is not and, after giving effect to the
          offering and sale of the Shares to be sold by the Company and the
          application of the proceeds thereof as described in the Prospectus,
          will not be an "investment company" as such term is defined in the
          Investment Company Act of 1940, as amended;

                  (xii)       to the best of such counsel's knowledge, there is
          no legal or beneficial owner of any securities of the Company who has
          any rights, not effectively satisfied or waived, to require
          registration of any shares of capital stock of the Company in
          connection with the filing of the Registration Statement;

                 (xiii)       to the best of such counsel's knowledge:  (A) the
          Registration Statement has become effective under the Securities Act,
          no stop order proceedings with respect thereto have been instituted or
          are pending or threatened under the Securities Act and nothing has
          come to such counsel's attention to lead it to believe that such
          proceedings are contemplated; and (B) any required filing of the
          Prospectus and any supplement thereto pursuant to Rule 424(b) under
          the Securities Act has been made in the manner and within the time
          period required by such Rule 424(b);

                  (xiv)       the Common Stock has been approved for quotation
          on The Nasdaq National Market; and

                   (xv)       such counsel (A) is of the opinion that the
          Registration Statement and Prospectus (except for financial statements
          and schedules and other financial and statistical data included
          therein as to which such counsel need not express any opinion) comply
          as to form in all material respects with the Securities Act and the
          applicable rules and regulations of the Commission thereunder, (B) has
          no reason to believe that (except for financial statements and
          schedules and other financial and statistical data as to which such
          counsel need not express any belief) the Registration Statement and
          the Prospectus included therein at the time the Registration Statement
          became effective contained any untrue statement of a material fact or
          omitted to state a material fact required to be stated therein or
          necessary to make the statements therein not misleading and (C) has no
          reason to believe that (except for financial statements and schedules
          and other financial and statistical data as to which such counsel need
          not express any belief) the Prospectus contains any untrue statement
          of a material fact or omits to state a material fact necessary in
          order to make the statements therein, in the light of the
          circumstances under which they were made, not misleading.

                                      -14-
<PAGE>

          (e)  The Underwriters shall have received on the Closing Date an
     opinion of ___________, counsel for the Selling Stockholders, dated the
     Closing Date, to the effect that:

                    (i)       this Agreement has been duly authorized, executed
          and delivered by or on behalf of each of the Selling Stockholders;

                   (ii)       the execution and delivery by each Selling
          Stockholder of, and the performance by such Selling Stockholder of its
          obligations under, this Agreement and the Custody Agreement and Power
          of Attorney of such Selling Stockholder will not contravene any
          provision of applicable law, or the certificate of incorporation or
          by-laws of such Selling Stockholder (if such Selling Stockholder is a
          corporation), or, to the best of such counsel's knowledge, any
          agreement or, or to the best of such counsel's knowledge, any
          agreement or other instrument binding upon such Selling Stockholder
          or, to the best of such counsel's knowledge, any judgment, order or
          decree of any governmental body or agency is required for the
          performance by such Selling Stockholder of its obligations under this
          Agreement or the Custody Agreement or Power of Attorney of such
          Selling Stockholder, except such as may be required by the securities
          or Blue Sky laws of the various states in connection with offer and
          sale of the Shares;

                  (iii)       each of the Selling Stockholders has valid title
          to the Shares to be sold by such Selling Stockholder and the legal
          right and power, and all authorization and approval required by law,
          to enter into this Agreement and the Custody Agreement and Power of
          Attorney of such Selling Stockholder and to sell, transfer and deliver
          the Shares to be sold by such Selling Stockholder;

                   (iv)       the Custody Agreement and the Power of Attorney of
          each Selling Stockholder have been duly authorized, executed and
          delivered by such Selling Stockholder and are valid and binding
          agreements of such Selling Stockholder;

                    (v)       delivery of the Shares to be sold by each Selling
          Stockholder pursuant to this Agreement will pass title to such Shares
          free and clear of any security interests, claims, liens, equities and
          other encumbrances; and

                   (vi)       such counsel, to the extent that any statements or
          omissions made in the Registration Statement, and preliminary
          prospectus, the Prospectus, or any amendment or supplement thereto,
          are made in reliance upon and in conformity with written information
          furnished to the Company by such Selling Stockholder expressly for use
          therein, (A) is of the opinion that the Registration Statement and
          Prospectus (except for financial statements and schedules and other
          financial and statistical data included therein as to which such
          counsel need not express any opinion) comply as to form in all
          material respects with the Securities Act and the applicable rules and
          regulations of the Commission thereunder, (B) has no reason to believe
          that (except for financial statements and schedules and other
          financial and statistical data as

                                      -15-
<PAGE>

          to which such counsel need not express any belief) the Registration
          Statement and the prospectus included therein at the time the
          Registration Statement became effective contained any untrue statement
          of a material fact or omitted to state a material fact required to be
          stated therein or necessary to make the statements therein not
          misleading and (C) has no reason to believe that (except for financial
          statements and schedules and other financial and statistical data as
          to which such counsel need not express any belief) the Prospectus
          contains any untrue statement of a material fact or omits to state a
          material fact necessary in order to make the statements therein, in
          the light of the circumstances under which they were made, not
          misleading.


          (f)  The Underwriters shall have received on the Closing Date an
     opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation,
     counsel for the Underwriters, dated the Closing Date, covering the matters
     referred to in subparagraphs (vi), (vii), (ix) (but only as to the
     statements in the Prospectus under "Description of Capital Stock" and
     "Underwriters") and (xv) of paragraph (d) above.

          With respect to subparagraph (xv) of paragraph (d) above, Brobeck,
     Phleger & Harrison LLP and Wilson Sonsini Goodrich & Rosati, Professional
     Corporation, may state that their opinion and belief are based upon their
     participation in the preparation of the Registration Statement and
     Prospectus and any amendments or supplements thereto and review and
     discussion of the contents thereof, but are without independent check or
     verification, except as specified.  With respect to paragraph (e) above,
     ____________ may rely upon an opinion or opinions of counsel for any
     Selling Stockholders and, with respect to factual matters and to the extend
     such counsel deems appropriate, upon the representations of each Selling
     Stockholder contained herein and in the Custody Agreement and Power of
     Attorney of such Selling Stockholder and in other documents and
     instruments; PROVIDED that (A) each such counsel for the Selling
     Stockholders is satisfactory to your counsel, (B) a copy of each opinion so
     relied upon is delivered to you and is in form and substance satisfactory
     to your counsel, (C) copies of such Custody Agreements and Powers of
     Attorney and of any such other documents and instruments shall be delivered
     to you and shall be in form and substance satisfactory to your counsel and
     (D) ___________________ shall state in their opinion that they are
     justified in relying on each such other opinion.

          The opinions of __________________ and _________________ described in
     paragraphs (d) and (e) above (and any opinions of counsel for any Selling
     Stockholder referred to in the immediately preceding paragraph) shall be
     rendered to the Underwriters at the request of the Company or one or more
     of the Selling Stockholders, as the case may be, and shall so state
     therein.

          The opinion of Brobeck, Phleger & Harrison LLP described in
     paragraph (d) above shall be rendered to the Underwriters at the request of
     the Company and shall so state therein.

                                      -16-
<PAGE>

          (g)  The Underwriters shall have received, on each of the date hereof
     and the Closing Date, a letter dated the date hereof or the Closing Date,
     as the case may be, in form and substance satisfactory to the Underwriters,
     from KPMG Peat Marwick LLP, independent public accountants, containing
     statements and information of the type ordinarily included in accountants'
     "comfort letters" to underwriters with respect to the financial statements
     and certain financial information contained in the Registration Statement
     and the Prospectus; PROVIDED that the letter delivered on the Closing Date
     shall use a "cut-off date" not earlier than the date hereof.

          (h)  The "lock-up" agreements, each substantially in the form of
     Exhibit A hereto, between you and certain stockholders, each officer and
     director of the Company relating to sales and certain other dispositions of
     shares of Common Stock or certain other securities, delivered to you on or
     before the date hereof, shall be in full force and effect on the Closing
     Date.

          (i)  The Common Stock shall have been approved for quotation on The
     Nasdaq National Market, subject only to official notice of issuance.

          (j)  The Company shall have complied with the provisions of
     paragraph (a) of Section 7 hereof with respect to the furnishing of
     Prospectuses on the business day following the date of this Agreement.

     All the agreements, opinions, certificates and letters mentioned above or
elsewhere in this Agreement shall be deemed in compliance with the provisions
hereof only if Wilson Sonsini Goodrich & Rosati, Professional Corporation,
counsel for the Underwriters, shall be reasonably satisfied that they comply in
form and scope.

     The several obligations of the Underwriters to purchase Additional Shares
hereunder are subject to the delivery to you on the Option Closing Date of such
documents as you may reasonably request with respect to the good standing of the
Company, the due authorization and issuance of the Additional Shares, other
matters related to the issuance of the Additional Shares and an opinion or
opinions of Brobeck, Phleger & Harrison LLP, counsel for the Company, and
__________, counsel for the Selling Stockholders, in form and substance
satisfactory to Wilson, Sonsini, Goodrich & Rosati, Professional Corporation,
counsel for the Underwriters.

     7.   COVENANTS OF THE COMPANY.  In further consideration of the agreements
of the Underwriters herein contained, the Company covenants with each
Underwriter as follows:

          (a)  To furnish to you, without charge, five (5) signed copies of the
     Registration Statement (including exhibits thereto) and for delivery to
     each other Underwriter a conformed copy of the Registration Statement
     (without exhibits thereto) and to furnish to you in New York City, without
     charge, prior to 10:00 A.M. New York City time on the business day next
     succeeding the date of this Agreement and during the period mentioned in
     paragraph (c)

                                      -17-
<PAGE>

     below, as many copies of the Prospectus and any supplements and amendments
     thereto or to the Registration Statement as you may reasonably request.

          (b)  Before amending or supplementing the Registration Statement or
     the Prospectus, to furnish to you a copy of each such proposed amendment or
     supplement and not to file any such proposed amendment or supplement to
     which you reasonably object, and to file with the Commission within the
     applicable period specified in Rule 424(b) under the Securities Act any
     prospectus required to be filed pursuant to such Rule.

          (c)  If, during such period after the first date of the public
     offering of the Shares as in the opinion of Wilson Sonsini Goodrich &
     Rosati, Professional Corporation, counsel for the Underwriters, the
     Prospectus is required by law to be delivered in connection with sales by
     an Underwriter or dealer, any event shall occur or condition exist as a
     result of which it is necessary to amend or supplement the Prospectus in
     order to make the statements therein, in the light of the circumstances
     when the Prospectus is delivered to a purchaser, not misleading, or if, in
     the opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation,
     counsel for the Underwriters, it is necessary to amend or supplement the
     Prospectus to comply with applicable law, forthwith to prepare, file with
     the Commission and furnish, at its own expense, to the Underwriters and to
     the dealers (whose names and addresses you will furnish to the Company) to
     which Shares may have been sold by you on behalf of the Underwriters and to
     any other dealers upon request, either amendments or supplements to the
     Prospectus so that the statements in the Prospectus as so amended or
     supplemented will not, in the light of the circumstances when the
     Prospectus is delivered to a purchaser, be misleading or so that the
     Prospectus, as amended or supplemented, will comply with law.

          (d)  To endeavor to qualify the Shares for offer and sale under the
     securities or Blue Sky laws of such jurisdictions, foreign and domestic, as
     you shall reasonably request and to pay all expenses (including fees and
     disbursements of counsel) in connection with such qualification and in
     connection with any review of the offering of the Shares by the National
     Association of Securities Dealers, Inc.

          (e)  To make generally available to the Company's security holders and
     to you as soon as practicable an earning statement covering the twelve-
     month period ending __________, 1998 that satisfies the provisions of
     Section 11(a) of the Securities Act and the rules and regulations of the
     Commission thereunder.

          (f)  Whether or not the transactions contemplated in this Agreement
     are consummated or this Agreement is terminated, to pay or cause to be paid
     all expenses incident to the performance of its obligations under this
     Agreement, including:  (i) the fees, disbursements and expenses of the
     Company's counsel and the Company's accountants in connection with the
     registration and delivery of the Shares under the Securities Act and all
     other fees or expenses in connection with the preparation and filing of the
     Registration Statement, any preliminary prospectus, the Prospectus and
     amendments and supplements to any of the foregoing, including all printing
     costs associated therewith, and the mailing and

                                      -18-
<PAGE>

     delivering of copies thereof to the Underwriters and dealers, in the
     quantities hereinabove specified, (ii) all costs and expenses related to
     the transfer and delivery of the Shares to the Underwriters, including any
     transfer or other taxes payable thereon, (iii) the cost of printing or
     producing any Blue Sky or Legal Investment memorandum in connection with
     the offer and sale of the Shares under state securities laws and foreign
     securities laws (in connection with qualification for the Directed Share
     Program requested by the Company) and all expenses in connection with the
     qualification of the Shares for offer and sale under state securities laws
     and foreign securities laws as provided in Section 7(d) hereof, including
     filing fees and the reasonable fees and disbursements of counsel for the
     Underwriters in connection with such qualification and in connection with
     the Blue Sky or Legal Investment memorandum, (iv) all filing fees and
     disbursements of counsel to the Underwriters incurred in connection with
     the review and qualification of the offering of the Shares by the National
     Association of Securities Dealers, Inc., (v) all costs and expenses
     incident to listing the Shares on the Nasdaq National Market, (vi) the cost
     of printing certificates representing the Shares, (vii) the costs and
     charges of any transfer agent, registrar or depositary, (viii) the costs
     and expenses of the Company relating to investor presentations on any "road
     show" undertaken in connection with the marketing of the offering of the
     Shares, including, without limitation, expenses associated with the
     production of road show slides and graphics, fees and expenses of any
     consultants engaged in connection with the road show presentations with the
     prior approval of the Company, travel and lodging expenses of the
     representatives and officers of the Company and any such consultants, and
     the cost of any aircraft chartered in connection with the road show, and
     (ix) all other costs and expenses incident to the performance of the
     obligations of the Company hereunder for which provision is not otherwise
     made in this Section.  It is understood, however, that except as provided
     in this Section, Section 8 entitled "Indemnity and Contribution", and the
     last paragraph of Section 10 below, the Underwriters will pay all of their
     costs and expenses, including fees and disbursements of their counsel,
     stock transfer taxes payable on resale of any of the Shares by them and any
     advertising expenses connected with any offers they may make.

          (g)  During a period of three years from the effective date of the
     Registration Statement, the Company will furnish to you copies of (i) all
     reports to its stockholders and (ii) all reports, financial statements and
     proxy or information statements filed by the Company with the Commission or
     any national securities exchange.

          (h)  The Company will apply the proceeds from the sale of the Shares
     as set forth under "Use of Proceeds" in the Prospectus.

          (i)  The Company will use its best efforts to obtain and maintain in
     effect the quotation of the Shares on The Nasdaq National Market and will
     take all necessary steps to cause the Shares to be included on The Nasdaq
     National Market as promptly as practicable and to maintain such inclusion
     for a period of three years after the date hereof or until such earlier
     date as the Shares shall be listed for regular trading privileges on The
     Nasdaq National Market or another national securities exchange approved by
     you.

                                      -19-
<PAGE>

          (j)  The Company will comply with all registration, filing and
     reporting requirements of the Securities Exchange Act of 1934, as amended
     (the "Exchange Act"), which may from time to time be applicable to the
     Company.

          (k)  The Company will comply with all provisions of all undertakings
     contained in the Registration Statement.

          (l)  Prior to the Closing Date or any Option Closing Date, as the case
     may be, the Company will not, directly or indirectly,  issue any press
     release or other communication and will not hold any press conference with
     respect to the Company, or its financial condition, results of operations,
     business, properties, assets, or prospects or this offering, without your
     prior written consent.

          (m)  If at any time during such period after the first date of the
     public offering of the Shares as in the opinion of Wilson Sonsini
     Goodrich & Rosati, Professional Corporation, counsel for the Underwriters,
     the Prospectus is required by law to be delivered in connection with sales
     by an Underwriter or dealer, any rumor, publication or event relating to or
     affecting the Company shall occur as a result of which in your opinion the
     market price for the Common Stock has been or is likely to be materially
     affected (regardless of whether such rumor, publication or event
     necessitates a supplement to or amendment of the Prospectus), the Company
     will, after written notice from you advising the Company to the effect set
     forth above, forthwith prepare, consult with you concerning the substance
     of, and disseminate a press release or other public statement, reasonably
     satisfactory to you, responding to or commenting on such rumor, publication
     or event.

          (n)  The Company agrees:  (i) to enforce the terms of each Lock-up
     Agreement, (ii) issue stop-transfer instructions to the transfer agent for
     the Common Stock with respect to any transaction or contemplated
     transaction that would constitute a breach of or default under the
     applicable Lock-up Agreement and (iii) upon written request of Morgan
     Stanley & Co. Incorporated, to release from the Lock-up Agreements those
     shares of Common Stock held by those holders set forth in such request.  In
     addition, except with the prior written consent of Morgan Stanley & Co.
     Incorporated, the Company agrees (i) not to amend or terminate, or waive
     any right under, any Lock-up Agreement, or take any other action that would
     directly or indirectly have the same effect as an amendment or termination,
     or waiver of any right under, any Lock-up Agreement, that would permit any
     holder of shares of Common Stock, or securities convertible into or
     exercisable or exchangeable for Common Stock who is a party to a Lock-up
     Agreement, to sell, make any short sale of, grant any option for the
     purchase of, or otherwise transfer or dispose of, any of such shares of
     Common Stock or other securities prior to the expiration of 90 days after
     the date of the Prospectus, and (ii) not to consent to any sale, short
     sale, grant of an option for the purchase of, or other disposition or
     transfer of shares of Common Stock, or securities convertible into or
     exercisable or exchangeable for Common Stock, subject to a Lock-up
     Agreement.

     8.   INDEMNITY AND CONTRIBUTION.

                                      -20-
<PAGE>

          (a)  The Company agrees to indemnify and hold harmless each
     Underwriter and each person, if any, who controls any Underwriter within
     the meaning of either Section 15 of the Securities Act or Section 20 of the
     Exchange Act from and against any and all losses, claims, damages and
     liabilities (including, without limitation, any legal or other expenses
     reasonably incurred in connection with defending or investigating any such
     action or claim) caused by any untrue statement or alleged untrue statement
     of a material fact contained in the Registration Statement or any amendment
     thereof, any preliminary prospectus or the Prospectus (as amended or
     supplemented if the Company shall have furnished any amendments or
     supplements thereto), or caused by any omission or alleged omission to
     state therein a material fact required to be stated therein or necessary to
     make the statements therein not misleading, except insofar as such losses,
     claims, damages or liabilities are caused by any such untrue statement or
     omission or alleged untrue statement or omission based upon information
     relating to any Underwriter furnished to the Company in writing by such
     Underwriter through you expressly for use therein; PROVIDED, HOWEVER, that
     the foregoing indemnity agreement with respect to any preliminary
     prospectus shall not inure to the benefit of any Underwriter from whom the
     person asserting any such losses, claims, damages or liabilities purchased
     Shares, or any person controlling such Underwriter, if a copy of the
     Prospectus (as then amended or supplemented if the Company shall have
     furnished any amendments or supplements thereto) was not sent or given by
     or on behalf of such Underwriter to such person, if required by law so to
     have been delivered, at or prior to the written confirmation of the sale of
     the Shares to such person, and if the Prospectus (as so amended or
     supplemented) would have cured the defect giving rise to such losses,
     claims, damages or liabilities, unless such failure is the result of
     noncompliance by the Company with Section 7(a) hereof.

          (b)  Each Selling Stockholder agrees, severally and not jointly, to
     indemnify and hold harmless the Company, its directors, its officers who
     sign the Registration Statement, each Underwriter and each person, if any,
     who controls the Company or any Underwriter within the meaning of either
     Section 15 of the Securities Act or Section 20 of the Exchange Act, from
     and against any and all losses, claims, damages and liabilities (including,
     without limitation, any legal or other expenses reasonably incurred in
     connection with defending or investigating any such action or claim) caused
     by any untrue statement or alleged untrue statement of a material fact
     contained in the Registration Statement or any amendment thereof, any
     preliminary prospectus or the Prospectus (as amended or supplemented if the
     Company shall have furnished any amendments or supplements thereto), or
     caused by any omission or alleged omission to state therein a material fact
     required to be stated therein or necessary to make the statements therein
     not misleading, but only with reference to information relating to such
     Selling Stockholder furnished in writing by or on behalf of such Selling
     Stockholder expressly for use in the Registration Statement, any
     preliminary prospectus, the Prospectus or any amendments or supplements
     thereto.

          (c)  Each Underwriter agrees, severally and not jointly, to indemnify
     and hold harmless the Company, the Selling Stockholders, the directors of
     the Company, the officers of the Company who sign the Registration
     Statement and each person, if any, who controls the Company or any Selling
     Stockholder within the meaning of either Section 15 of the Securities

                                      -21-
<PAGE>

     Act or Section 20 of the Exchange Act to the same extent as the foregoing
     indemnity from the Company or any Selling Stockholder to such Underwriter,
     but only with reference to information relating to such Underwriter
     furnished to the Company in writing by such Underwriter through you
     expressly for use in the Registration Statement, any preliminary
     prospectus, the Prospectus or any amendments or supplements thereto.

          (d)  In case any proceeding (including any governmental investigation)
     shall be instituted involving any person in respect of which indemnity may
     be sought pursuant to paragraph (a), (b) or (c) of this Section 8, such
     person (the "indemnified party") shall promptly notify the person against
     whom such indemnity may be sought (the "indemnifying party") in writing and
     the indemnifying party, upon request of the indemnified party, shall retain
     counsel reasonably satisfactory to the indemnified party to represent the
     indemnified party and any others the indemnifying party may designate in
     such proceeding and shall pay the fees and disbursements of such counsel
     related to such proceeding.  In any such proceeding, any indemnified party
     shall have the right to retain its own counsel, but the fees and expenses
     of such counsel shall be at the expense of such indemnified party unless
     (i) the indemnifying party and the indemnified party shall have mutually
     agreed to the retention of such counsel or (ii) the named parties to any
     such proceeding (including any impleaded parties) include both the
     indemnifying party and the indemnified party and representation of both
     parties by the same counsel would be inappropriate due to actual or
     potential differing interests between them.  It is understood that the
     indemnifying party shall not, in respect of the legal expenses of any
     indemnified party in connection with any proceeding or related proceedings
     in the same jurisdiction, be liable for (i) the fees and expenses of more
     than one separate firm (in addition to any local counsel) for all
     Underwriters and all persons, if any, who control any Underwriter within
     the meaning of either Section 15 of the Securities Act or Section 20 of the
     Exchange Act, (ii) the fees and expenses of more than one separate firm (in
     addition to any local counsel) for the Company, its directors, its officers
     who sign the Registration Statement and each person, if any, who controls
     the Company within the meaning of either such Section and (iii) the fees
     and expenses of more than one separate firm (in addition to any local
     counsel) for all Selling Stockholders and all persons, if any, who control
     any Selling Stockholder within the meaning of either such Section, and that
     all such fees and expenses shall be reimbursed as they are incurred.  In
     the case of any such separate firm for the Underwriters and such control
     persons of any Underwriters, such firm shall be designated in writing by
     Morgan Stanley & Co. Incorporated.  In the case of any such separate firm
     for the Company, and such directors, officers and control persons of the
     Company, such firm shall be designated in writing by the Company.  In the
     case of any Selling Stockholders, such firm shall be designated in writing
     by the persons named as attorney-in-fact for the Selling Stockholders under
     the Powers of Attorney.  The indemnifying party shall not be liable for any
     settlement of any proceeding effected without its written consent, but if
     settled with such consent or if there be a final judgment for the
     plaintiff, the indemnifying party agrees to indemnify the indemnified party
     from and against any loss or liability by reason of such settlement or
     judgment.  Notwithstanding the foregoing sentence, if at any time an
     indemnified party shall have requested an indemnifying party to reimburse
     the indemnified party for fees and expenses of counsel as contemplated by
     the second and third sentences of this paragraph,

                                      -22-
<PAGE>

     the indemnifying party agrees that it shall be liable for any settlement of
     any proceeding effected without its written consent if (i) such settlement
     is entered into more than 60 days after receipt by such indemnifying party
     of the aforesaid request and (ii) such indemnifying party shall not have
     reimbursed the indemnified party in accordance with such request prior to
     the date of such settlement.  No indemnifying party shall, without the
     prior written consent of the indemnified party, effect any settlement of
     any pending or threatened proceeding in respect of which any indemnified
     party is or could have been a party and indemnity could have been sought
     hereunder by such indemnified party, unless such settlement includes an
     unconditional release of such indemnified party from all liability on
     claims that are the subject matter of such proceeding.

          (e)  To the extent the indemnification provided for in paragraph (a),
     (b) or (c) of this Section 8 is unavailable to an indemnified party or
     insufficient in respect of any, losses, claims, damages or liabilities
     referred to therein, then each indemnifying party under such paragraph, in
     lieu of indemnifying such indemnified party thereunder, shall contribute to
     the amount paid or payable by such indemnified party as a result of such
     losses, claims, damages or liabilities (i) in such proportion as is
     appropriate to reflect the relative benefits received by the indemnifying
     party or parties on the one hand and the indemnified party or parties on
     the other hand from the offering of the Shares or (ii) if the allocation
     provided by clause (i) above is not permitted by applicable law, in such
     proportion as is appropriate to reflect not only the relative benefits
     referred to in clause (i) above but also the relative fault of the
     indemnifying party or parties on the one hand and of the indemnified party
     or parties on the other hand in connection with the statements or omissions
     that resulted in such losses, claims, damages or liabilities, as well as
     any other relevant equitable considerations.  The relative benefits
     received by the Sellers on the one hand and the Underwriters on the other
     hand in connection with the offering of the Shares shall be deemed to be in
     the same respective proportions as the net proceeds from the offering of
     the Shares (before deducting expenses) received by each Seller and the
     total underwriting discounts and commissions received by the Underwriters,
     in each case as set forth in the table on the cover of the Prospectus, bear
     to the aggregate Public Offering Price of the Shares.  The relative fault
     of the Sellers on the one hand and the Underwriters on the other hand shall
     be determined by reference to, among other things, whether the untrue or
     alleged untrue statement of a material fact or the omission or alleged
     omission to state a material fact relates to information supplied by the
     Sellers or by the Underwriters and the parties' relative intent, knowledge,
     access to information and opportunity to correct or prevent such statement
     or omission.  The Underwriters' respective obligations to contribute
     pursuant to this Section 8 are several in proportion to the respective
     number of Shares they have purchased hereunder, and not joint.

          (f)  The Sellers and the Underwriters agree that it would not be just
     or equitable if contribution pursuant to this Section 8 were determined by
     PRO RATA allocation (even if the Underwriters were treated as one entity
     for such purpose) or by any other method of allocation that does not take
     account of the equitable considerations referred to in paragraph (e) of
     this Section 8.  The amount paid or payable by an indemnified party as a
     result of the losses, claims, damages and liabilities referred to in the
     immediately preceding

                                      -23-
<PAGE>

     paragraph shall be deemed to include, subject to the limitations set forth
     above, any legal or other expenses reasonably incurred by such indemnified
     party in connection with investigating or defending any such action or
     claim.  Notwithstanding the provisions of this Section 8, no Underwriter
     shall be required to contribute any amount in excess of the amount by which
     the total price at which the Shares underwritten by it and distributed to
     the public were offered to the public exceeds the amount of any damages
     that such Underwriter has otherwise been required to pay by reason of such
     untrue or alleged untrue statement or omission or alleged omission.  No
     person guilty of fraudulent misrepresentation (within the meaning of
     Section 11(f) of the Securities Act) shall be entitled to contribution from
     any person who was not guilty of such fraudulent misrepresentation.  The
     remedies provided for in this Section 8 are not exclusive and shall not
     limit any rights or remedies which may otherwise be available to any
     indemnified party at law or in equity.

          (g)  The indemnity and contribution provisions contained in this
     Section 8 and the representations, warranties and other statements of the
     Company and the Selling Stockholders contained in this Agreement shall
     remain operative and in full force and effect regardless of (i) any
     termination of this Agreement, (ii) any investigation made by or on behalf
     of any Underwriter or any person controlling any Underwriter, any Selling
     Stockholder or any person controlling any Selling Stockholder or by or on
     behalf of the Company, its officers or directors or any person controlling
     the Company and (iii) acceptance of and payment for any of the Shares.

     9.   TERMINATION.  This Agreement shall be subject to termination by notice
given by you to the Company, if (a) after the execution and delivery of this
Agreement and prior to the Closing Date (i) trading generally shall have been
suspended or materially limited on or by, as the case may be, any of the New
York Stock Exchange, the American Stock Exchange, the National Association of
Securities Dealers, Inc., the Chicago Board of Options Exchange, the Chicago
Mercantile Exchange or the Chicago Board of Trade, (ii) trading of any
securities of the Company shall have been suspended on any exchange or in any
over-the-counter market, (iii) a general moratorium on commercial banking
activities in New York shall have been declared by either Federal or New York
State authorities or (iv) there shall have occurred any outbreak or escalation
of hostilities or any change in financial markets or any calamity or crisis
that, in your judgment, is material and adverse and (b) in the case of any of
the events specified in clauses (a)(i) through (iv), such event, singly or
together with any other such event, makes it, in your judgment, impracticable to
market the Shares on the terms and in the manner contemplated in the Prospectus.

     10.  EFFECTIVENESS; DEFAULTING UNDERWRITERS.  This Agreement shall become
effective upon the execution and delivery hereof by the parties hereto.

     If, on the Closing Date or the Option Closing Date, as the case may be, any
one or more of the Underwriters shall fail or refuse to purchase Shares that it
has or they have agreed to purchase hereunder on such date, and the aggregate
number of Shares which such defaulting Underwriter or Underwriters agreed but
failed or refused to purchase is not more than one-tenth of the aggregate number
of the Shares to be purchased on such date, the other Underwriters shall be
obligated

                                      -24-
<PAGE>

severally in the proportions that the number of Firm Shares set forth opposite
their respective names in Schedule II or Schedule III bears to the aggregate
number of Firm Shares set forth opposite the names of all such non-defaulting
Underwriters, or in such other proportions as you may specify, to purchase the
Shares which such defaulting Underwriter or Underwriters agreed but failed or
refused to purchase on such date; PROVIDED that in no event shall the number of
Shares that any Underwriter has agreed to purchase pursuant to this Agreement be
increased pursuant to this Section 10 by an amount in excess of one-ninth of
such number of Shares without the written consent of such Underwriter.  If, on
the Closing Date, any Underwriter or Underwriters shall fail or refuse to
purchase Firm Shares and the aggregate number of Firm Shares with respect to
which such default occurs is more than one-tenth of the aggregate number of Firm
Shares to be purchased, and arrangements satisfactory to you, the Company and
the attorney-in-fact for the Selling Stockholders for the purchase of such Firm
Shares are not made within 36 hours after such default, this Agreement shall
terminate without liability on the part of any non-defaulting Underwriter, the
Company or any Selling Stockholder.  In any such case either you or the Company
shall have the right to postpone the Closing Date, but in no event for longer
than seven days, in order that the required changes, if any, in the Registration
Statement and in the Prospectus or in any other documents or arrangements may be
effected.  If, on the Option Closing Date, any Underwriter or Underwriters shall
fail or refuse to purchase Additional Shares and the aggregate number of
Additional Shares with respect to which such default occurs is more than one-
tenth of the aggregate number of Additional Shares to be purchased, the non-
defaulting Underwriters shall have the option to (i) terminate their obligation
hereunder to purchase Additional Shares or (ii) purchase not less than the
number of Additional Shares that such non-defaulting Underwriters would have
been obligated to purchase in the absence of such default.  Any action taken
under this paragraph shall not relieve any defaulting Underwriter from liability
in respect of any default of such Underwriter under this Agreement.

     If this Agreement shall be terminated by the Underwriters, or any of them,
because of any failure or refusal on the part of any Seller to comply with the
terms or to fulfill any of the conditions of this Agreement, or if for any
reason any Seller shall be unable to perform its obligations under this
Agreement, the Sellers will reimburse the Underwriters or such Underwriters as
have so terminated this Agreement with respect to themselves, severally, for all
out-of-pocket expenses (including the fees and disbursements of their counsel)
reasonably incurred by such Underwriters in connection with this Agreement or
the offering contemplated hereunder.

     11.  COUNTERPARTS.  This Agreement may be signed in two or more
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

     12.  APPLICABLE LAW.  This Agreement shall be governed by and construed in
accordance with the internal laws of the State of New York.

     13.  HEADINGS.  The headings of the sections of this Agreement have been
inserted for convenience of reference only and shall not be deemed a part of
this Agreement.

                       [Signature Page follows this Page]

                                      -25-
<PAGE>
                               Very truly yours,

                              Advanced Fibre Communications, Inc.


                              By:
                                   ---------------------------------------------
                                   Name: Dan E. Steimle
                                   Title:  Vice President, Chief Financial
                                           Officer



                              The Selling Stockholders named in Schedule I
                              hereto, acting severally




                              By:
                                   ---------------------------------------------
                                   Attorney-in-Fact

                                      -26-
<PAGE>

Accepted as of the date hereof:

Morgan Stanley & Co. Incorporated
Merrill Lynch, Pierce, Fenner & Smith
             Incorporated
Cowen & Company
Hambrecht & Quist LLC

Acting severally on behalf of themselves
and the several U.S. Underwriters named in
Schedule I hereto.

By Morgan Stanley & Co. Incorporated


By:
     ----------------------------------------
     Name:  William R. Salisbury
     Title:    Vice President


Morgan Stanley & Co. International Limited
Merrill Lynch International
Cowen & Company
Hambrecht & Quist LLC

Acting severally on behalf of themselves and the
several International Underwriters named in
Schedule II hereto.

By Morgan Stanley & Co. International Limited


By:
    -----------------------------------------
              (Attorney-in-Fact)

                                      -27-
<PAGE>

                                   SCHEDULE I


                                             NUMBER OF           NUMBER OF
                                            FIRM SHARES      ADDITIONAL SHARES
                                            TO BE SOLD           TO BE SOLD
                                            -----------      -----------------


COMPANY. . . . . . . . . . . . . . . .

SELLING STOCKHOLDERS






Total. . . . . . . . . . . . . . . . .            2,600,000              390,000
                                               ------------       --------------
                                               ------------       --------------


                                      -28-
<PAGE>
                                    SCHEDULE II

                                U.S. UNDERWRITERS



                                                               Number of
                                                              Firm Shares
     Underwriter                                            To Be Purchased
     -----------                                            ----------------

Morgan Stanley & Co. Incorporated . . . . . . . . . . . .
Merrill Lynch, Pierce, Fenner & Smith
           Incorporated. . . . . . . . . . . . . . . . . .
Cowen & Company. . . . . . . . . . . . . . . . . . . . . .
Hambrecht & Quist LLC. . . . . . . . . . . . . . . . . . .       ----------




                                   Total . . . . . . . . .         2,080,000
                                                                 -----------
                                                                 -----------

<PAGE>

                                  SCHEDULE III

                           INTERNATIONAL UNDERWRITERS


                                                               Number of
                                                              Firm Shares
     Underwriter                                            To Be Purchased
     -----------                                            ----------------

Morgan Stanley & Co. International Limited . . . . . . .
Merrill Lynch International. . . . . . . . . . . . . . .
Cowen & Company. . . . . . . . . . . . . . . . . . . . .
Hambrecht & Quist LLC. . . . . . . . . . . . . . . . . .
                                                                 ----------
                                             Total                  520,000
                                                                 ----------
                                                                 ----------




                                       -2-

<PAGE>

                                                                       EXHIBIT A

                      ADVANCED FIBRE COMMUNICATIONS, INC.

                               LOCK-UP AGREEMENT


                               January ___, 1997

Morgan Stanley & Co. Incorporated
Merrill Lynch, Pierce, Fenner & Smith
            Incorporated
Cowen & Company
Hambrecht & Quist LLC
c/o Morgan Stanley & Co. Incorporated
    1585 Broadway
    New York, NY  10036

Morgan Stanley & Co. International Limited
Merrill Lynch International
Cowen & Company
Hambrecht & Quist LLC
c/o Morgan Stanley & Co. International Limited
    25 Cabot Square
    Canary Wharf
    London E14 4QA
    England

Dear Sirs and Mesdames:

     The undersigned understands that Morgan Stanley & Co. Incorporated ("Morgan
Stanley") proposes to enter into an Underwriting Agreement (the "Underwriting
Agreement") with Advanced Fibre Communications, Inc., a Delaware corporation
(the "Company"), providing for the public offering (the "Public Offering") by
the several Underwriters, including Morgan Stanley (the "Underwriters"), of
shares (the "Shares") of the Common Stock, par value $.01 per share,  of the
Company (the "Common Stock").

     To induce the Underwriters that may participate in the Public Offering to
continue their efforts in connection with the Public Offering, the undersigned
hereby agrees that, without the prior written consent of Morgan Stanley on
behalf of the Underwriters, it will not, during the period commencing on the
date hereof and ending 90 days after the date of the final prospectus relating
to the Public Offering (the "Prospectus"), (1) 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
(whether such shares or any such securities are now owned by the undersigned or
are hereafter acquired), or (2) enter into any swap or other arrangement that
transfers to another, in whole or in part, any of the economic consequences of
ownership of the Common Stock, whether any such transaction described in
clause (1) or (2) above is to be settled by delivery of Common Stock or such
other securities, in cash or otherwise.  Notwithstanding the foregoing, if the
undersigned is an individual, he or she may transfer any shares of Common Stock
either during

<PAGE>

his or her lifetime or on death by will or intestacy to his or her immediate
family or to a trust the beneficiaries of which are exclusively the undersigned
and/or a member or members of his or her immediate family; provided, however,
that in such case, it shall be a condition to the transfer that the transferee
execute an agreement (an original copy of which shall be provided to Morgan
Stanley) stating that the transferee is receiving and holding the shares of
Common Stock transferred subject to the provisions of this Agreement, and there
shall be no further transfer of such Common Stock except in accordance with this
Agreement.  For purposes of the preceding sentence, "immediate family" shall
mean spouse, lineal descendant, father, mother, brother or sister of the
transferor.   In addition, the undersigned agrees that, without the prior
written consent of Morgan Stanley on behalf of the Underwriters, it will not,
during the period commencing on the date hereof and ending 90 days after the
date of the Prospectus, make any demand for or exercise any right with respect
to, the registration of any shares of Common Stock or any security convertible
into or exercisable or exchangeable for Common Stock.

     Whether or not the Public Offering actually occurs depends on a number of
factors, including market conditions.  Any Public Offering will only be made
pursuant to an Underwriting Agreement, the terms of which are subject to
negotiation between the Company and the Underwriters.

     This agreement shall expire by its terms if the Underwriting Agreement is
not executed on or before March 31, 1997.

                                   Very truly yours,



                                   ---------------------------------------------
                                                (Print name of stockholder)



                                   ---------------------------------------------
                                                         (signature)



                                   ---------------------------------------------
                                    (name and title of signatory if applicable)


                                   Address:
                                             -----------------------------------
                                             -----------------------------------
                                             -----------------------------------


<PAGE>
                                                                     EXHIBIT 5.1
 
                                January 24, 1997
 
Advanced Fibre Communications, Inc.
1445 McDowell Boulevard North
Petaluma, CA 94954
 
Ladies and Gentlemen:
 
    We  have acted as counsel to Advanced Fibre Communications, Inc., a Delaware
corporation (the "Company"), in connection with its registration of an aggregate
of 2,600,000 shares of its common stock, of which 200,000 shares are proposed to
be issued by the Company and 2,400,000 shares are proposed to be sold by certain
stockholders of the Company, plus an over-allotment of 390,000 shares offered by
certain stockholders of  the Company  (the "Shares"),  all as  described in  the
Company's  Registration Statement  on Form  S-1, filed  with the  Securities and
Exchange  Commission  under  the  Securities  Act  of  1933,  as  amended   (the
"Registration Statement"). The Shares are to be sold pursuant to an Underwriting
Agreement  to  be  entered into  among  the  Company and  Morgan  Stanley  & Co.
Incorporated, Merrill  Lynch,  Pierce,  Fenner &  Smith  Incorporated,  Cowen  &
Company  and  Hambrecht  & Quist  LLC  as  representatives of  the  several U.S.
underwriters named  in such  Underwriting  Agreement and  Morgan Stanley  &  Co.
International   Limited,  Merrill  Lynch  International,  Cowen  &  Company  and
Hambrecht  &  Quist  LLC,  as  representatives  of  the  several   international
underwriters  (the  "International  Underwriters")  named  in  such Underwriting
Agreement (the "Underwriting Agreement").
 
    In connection with this  opinion, we have (i)  examined and relied upon  the
Registration  Statement and related Prospectus, the Company's Fourth Amended and
Restated Certificate of Incorporation, the Company's Bylaws and the originals or
copies certified to our satisfaction  of such records, documents,  certificates,
memorandum  or other instruments as in our judgment are necessary or appropriate
to enable us to  render the opinion  expressed below and  (ii) assumed that  the
Shares  will be sold by the U.S. Underwriters and the International Underwriters
at a price established by the Price  Committee of the Board of Directors of  the
Company.
 
    On  the  basis of  the foregoing,  and in  reliance thereon,  we are  of the
opinion that the Shares have been duly authorized, and, when sold and issued  by
the  Company and when sold by certain  stockholders of the Company in accordance
with the terms of the Underwriting Agreement, will be validly issued, fully paid
and nonassessable.
 
    We consent to the filing of this opinion as Exhibit 5.1 to the  Registration
Statement and to the reference to this firm under the caption "Legal Matters" in
the Prospectus which is part of the Registration Statement.
 
    It is understood that this opinion is to be used only in connection with the
offer and sale of the Shares while the Registration Statement is in effect.
 
                                          Very truly yours,
 
                                          BROBECK, PHLEGER & HARRISON LLP

<PAGE>

                                     Tellabs Contract No.  CON AFC 010 TER 96 10
                                     -------------------------------------------


                              TERMINATION AGREEMENT
                   OF JOINT VENTURE AND PARTNERSHIP AGREEMENT


This Termination Agreement of Joint Venture and Partnership Agreement
("Termination Agreement") is entered into as of December 23, 1996 (the
"Effective Date"), by and between Advance Fibre Communications, Inc., a Delaware
corporation located at 1445 McDowell Boulevard North Petaluma, California 94975
("AFC"), and Tellabs Operations, Inc., a Delaware corporation located at 4951
Indiana Avenue, Lisle, Illinois 60532 ("Tellabs").


WHEREAS, AFC and Tellabs (the "Partners") entered into that Joint Venture and
Partnership Agreement dated April 11, 1994 (the "J.V. Agreement") to form a
general partnership (the "J.V. Company") to design, develop, manufacture and
distribute a product line and its derivatives which were to allow telephone
services to be provided over existing cable television installed coaxial 
systems;

WHEREAS, Tellabs and AFC entered into a Memorandum of Understanding dated April
3, 1996 ("MOU") pursuant to which they a agreed to terminate the J.V. Agreement;
and

WHEREAS, AFC and Tellabs desire to terminate the J.V. Agreement and enter into a
License and Marketing Agreement ("License Agreement") and an OEM Agreement
contemporaneously herewith.

Capitalized terms used in this Termination Agreement that are not otherwise
defined herein shall have the meanings given to them in the J.V. Agreement.


In consideration of the mutual promises and covenants set forth herein, AFC and
Tellabs agree as follows:


1.   TERMINATION
     On April 3, 1996, upon entering into the MOU, the Partners agreed to
     terminate the J.V. Agreement and dissolve the J.V. Company.  Provided that
     the parties have contemporaneously executed the License Agreement, and that
     Tellabs has paid the amount under Section 2, the partnership shall be
     dissolved, effective as of the Effective Date.


- --------------------------------------------------------------------------------
                                                                    PAGE 1 OF 11
<PAGE>

2.   LIQUIDATION OF J.V. COMPANY ASSETS
     2.1     CONTRIBUTIONS AND LOANS
             In connection with the dissolution of the J.V. Company, Tellabs
             shall reimburse AFC for AFC's loans and advances to the J.V.
             Company in the amount of $1,650,563.51.  In exchange for such
             reimbursement, AFC shall waive the debt and accounts receivable
             owed to AFC by the J.V. Company in an amount of $1,650,563.51, 
             which is comprised of a $1,000,000 loan and $650,563.51 of 
             accounts payable owing to AFC. In addition, Tellabs shall pay to 
             AFC (i) interest of $69,791.87 (comprised of interest expense of 
             $60,648.50 accrued up through June 15, 1996 plus $9,143.37 in 
             interest income on cash in bank since June 15, 1996); and (ii) 
             $31,001.94 representing equipment lease payments paid by AFC 
             after April 3, 1996 relating to assets retained by Tellabs 
             hereunder.  The interest payment and equipment lease 
             reimbursements are not included in the $1,650,563.51 owing on 
             the loan and accounts payable.

     2.2     OWNERSHIP OF J.V. PRODUCT TECHNOLOGY AND THE JOINT TECHNOLOGY 
             Except for the Joint Technology (as defined below), all right,
             title and interest in and to the J.V. Product Technology (as
             defined in the J.V. Agreement) (and all patent rights, copyright
             rights, trade secrets and other proprietary rights thereto) shall
             vest in Tellabs, subject to the license rights granted to AFC in
             the License Agreement.  Tellabs will have the exclusive right to,
             and at Tellabs' expense, AFC agrees to assist Tellabs in every
             proper way (including without limitation, becoming a nominal party)
             to evidence, record and perfect such ownership including filing any
             and all patents in connection therewith.

             Notwithstanding the foregoing, Tellabs and AFC shall have equal
             rights to and shall jointly own all right, title and interest in
             all of the technology relating to the upconverter, direct down
             converter, the LUU-VIC burst receiver and the QPSK clock recovery
             circuits ("Joint Technology") with no ongoing obligations to one
             another to provide updates, enhancements, royalties or otherwise,
             except as provided in Section 8 of the License Agreement.

     2.3     OWNERSHIP OF UMC 1000 TECHNOLOGY AND AFC PROPRIETARY COMPONENTS
             All right, title and interest in and to the UMC 1000 Technology and
             AFC circuit designs which are a part of Tellabs' board designs (and
             all patent rights, copyright rights, trade secrets and other
             proprietary rights thereto) shall remain vested in AFC, subject to
             the license rights granted to Tellabs in the License Agreement. 
             Further, all right, title and interest in and to AFC proprietary
             components (and all patent rights, copyright rights,


- --------------------------------------------------------------------------------
                                                                    PAGE 2 OF 11

<PAGE>

             trade secrets and other proprietary rights thereto) shall remain
             vested in AFC.

     2.4     RIGHT TO USE PRE-EXISTING TECHNOLOGY
             The right of the J.V. Company to user AFC's Pre-existing Technology
             granted to the J.V. Company by AFC pursuant to Section 4.1 of the
             J.V. Agreement is hereby terminated.

     2.5     RIGHT TO MARKET STUDY
             The right to use the Market Study granted to the J.V. Company by
             Tellabs pursuant to Section 4.2 of the J.V. Agreement is hereby
             terminated.

     2.6     MARKETING RIGHTS
             The market rights granted to the Partners pursuant to Section 6 of
             the J.V. Agreement are hereby terminated and are superseded in
             their entirety by the market rights agreed upon by the parties in
             the License Agreement.

     2.7     OTHER J.V. COMPANY ASSETS
             AFC has purchased from the J.V. Company at the net book value on
             the J.V. Company's books, and shall be entitled to retain, those
             assets listed in Attachment A.  All right, title and interest in
             and to all other J.V. Company assets not specifically referred to 
             in subsections 2.1 through 2.6 above or in Attachment A shall vest
             in Tellabs.  Those assets shall include, but shall not be limited 
             to, the assets listed on Attachment B hereto.  The fixed assets to
             be transferred to Tellabs from the J.V. Company, along with title 
             to such assets, will be transferred at Tellabs' headquarters in
             Illinois.


3.   WINDING UP
     AFC and Tellabs each shall be obligated to provide for continuing support
     for the other Partner's embedded customer base as follows:
     3.1     Tellabs shall be responsible for making all royalty payments to
             Digicom.
     3.2     AFC shall be responsible for the Viacom cable expenses.
     3.3     Tellabs shall be responsible for making all payments to Cecil
             Deisch.
     3.4     Tellabs shall be responsible for making all payments to Victor
             Ivashin to the extent he performs any work for Tellabs after the
             Effective Date.


4.   MISCELLANEOUS
     4.1     MUTUAL REPRESENTATIONS AND WARRANTIES.
             Each Partner represents and warrants to the other Partner that,
             since April 3, 1996, and except as stated in the J.V. Company books
             and reflected in the J.V. Company's financial statements dated
             December 23, 1996, (which


- --------------------------------------------------------------------------------
                                                                    PAGE 3 OF 11

<PAGE>

             will be based upon the April 26, 1996 financial statements adjusted
             only for matters referred to in this Termination Agreement), (a)
             such Partner has not incurred any obligation or liability on behalf
             of or as apparent agent of the J.V. Company or the other Partner,
             or for which the other Partner may be charged, or for which the
             Partner intends to claim refund or reimbursement from the J.V.
             Company; and (b) such Partner has not received, discharged, or
             transferred any credit, moneys, property, or other assets of the
             J.V. Company.  These representations and warranties shall survive
             the final termination of the J.V. company.


     4.2     MUTUAL GENERAL RELEASE
             Each Partner, for itself, its predecessors, assigns and successors,
             hereby fully releases, remises, acquits, and discharges the other
             Partner, and each of its respective present or former officers,
             directors, shareholders, employees, agents, attorneys, parents,
             subsidiaries, affiliates, partners, joint venturers and successors
             and assigns (collectively, "Releasees") and covenants not to sue or
             otherwise institute or cause to be instituted or in any way
             participate in (except at the request of such Releasee) any legal
             or other proceedings or actions against any Releasee with respect
             to any matter whatsoever arising under the J.V. Agreement
             including, but not limited to, any and all liabilities, claims,
             demands, contracts, debts, obligations, and causes of action of
             every nature, kind and description, in law, equity, or otherwise,
             whether or not now known or ascertained, which heretofore do, or
             hereafter may, exist (other than matters arising under Section 10
             of the J.V. Agreement and other than matters arising out of the
             breach of any representation or warranty made pursuant to this
             Termination Agreement or the License Agreement (collectively, the
             "Non-Released Claims," which claims, if any, are specifically
             excluded)).

     4.3     UNCERTAIN CLAIMS
             Each Partner hereby acknowledges that it has considered the
             possibility that it may not now fully know the nature or value of
             the claims which are generally released pursuant to the above
             paragraph and that such general release extends to all claims of
             every nature and kind, known or unknown, suspected or unsuspected,
             past or present, however arising (except for the Non-Released
             Claims), and that any and all rights granted to such Partner
             pursuant to Section 1542 of the California Civil Code or any 
             analogous applicable state or federal law or regulation are 
             hereby expressly waived. Said Section 1542 of the Civil Code of 
             the State of California reads as follows:

             "A general release does not extend to claims which the creditor
             does not know or suspect to exist in his favor at the time of
             executing the release,


- --------------------------------------------------------------------------------
                                                                    PAGE 4 OF 11
<PAGE>

             which, if known by him, must have materially affected his
             settlement with the debtor."

     4.4     CONDUCT AFTER DISSOLUTION
             Each partner hereby covenants and agrees not to undertake any
             action or engage in any activity with respect to the assets of the
             J.V. Company or incur any liability, obligation or charge against
             the J.V. Company or the other Partner, following the Effective Date
             of the dissolution hereunder, except as contemplated by this
             Termination Agreement.

     4.5     INDEMNIFICATION
             Each Partner, for itself, its predecessors, assigns and successors,
             hereby agrees to indemnify and hold harmless the other Partner, and
             its respective present or former officers, directors, shareholders,
             employees, agents, attorneys, parents, subsidiaries, affiliates,
             partners, joint venturers and successors and assigns (collectively,
             "Indemnities"), against any and all losses, liabilities, damages,
             demands, claims, suits, actions, judgments, causes of action,
             assessments, costs and expenses, including, without limitation,
             interest, penalties, attorneys' fees, any and all expenses incurred
             in investigating, preparing, and defending against any litigation,
             commenced or threatened, and any claim whatsoever, and any and all
             amounts paid in settlement of any claim or litigation, asserted
             against, resulting from, imposed upon, or incurred or suffered by
             any Indemnitee, directly or indirectly, as a result of or arising
             from any inaccuracy in or breach or nonfulfillment of any of the
             representations, warranties, covenants or agreements made by such
             indemnifying Partner in this Agreement or any facts or
             circumstances constituting such an inaccuracy, breach, or
             nonfulfillment.

     4.6     FINAL TAX RETURN
             Each of Tellabs and AFC shall file a final tax return for the J.V.
             Company with each of Tellabs and AFC bearing their own costs for
             preparing and filing such return.  in addition, Tellabs and AFC
             shall cooperate with one another in providing the necessary
             information for preparing the final tax returns.

5.   GENERAL PROVISIONS
     5.1     RELATIONSHIP OF THE PARTIES


- --------------------------------------------------------------------------------
                                                                    PAGE 5 OF 11
<PAGE>

             Notwithstanding any provision hereof, for all purposes of this
             Termination Agreement each party shall be and act as an independent
             contractor and not as partner, joint venturer, or agent of the
             other and shall not bind nor attempt to bind the other to any
             contract.

     5.2.    ASSIGNMENT
             Neither party shall have any right or ability to assign, transfer,
             or sublicense any obligations or benefit under this Termination
             Agreement without the written consent of the other except that
             either party may assign and transfer this Termination Agreement and
             its rights and obligations hereunder to any third party who
             succeeds to substantially all its business, stock or assets whether
             by merger, sale, acquisition or otherwise.

     5.3     ENTIRE TERMINATION AGREEMENT; AMENDMENT.  This Termination
             Agreement (and all Attachments hereto) the License Agreement and
             the OEM Agreement constitute the entire and only agreement between
             the parties relating to the subject matter hereof, and all other
             prior negotiations, representations, understandings and agreements
             including but not limited to the MOU, are superseded hereby. No
             agreements amending or supplementing the terms hereof shall be
             effective except by means of a written document signed by the duly
             authorized representatives of both parties.

     5.4     NOTICES.  All notices, consents or approvals required by this
             Termination Agreement shall be in writing and shall be deemed given
             five (5) days after being sent by certified or registered air mail,
             postage prepaid, or when received after being sent by facsimile
             (confirmed by such certified or registered mail) or by commercial
             overnight courier service with tracking capabilities, to the 
             parties at the addresses set forth above or such other addresses
             as may be designated in writing by the respective parties pursuant
             to the terms of this notice provision.

     5.5     DISPUTES.
             5.5.1  In the event that the parties after diligent good faith
                    efforts, cannot resolve an issue, then the parties agree to
                    convene a meeting of their Presidents in an effort to reach
                    an appropriate resolution, settlement or compromise.  If
                    after diligent good faith efforts the Presidents are unable
                    to resolve the dispute, then the parties agree to retain an
                    impartial qualified mediator to assist in reaching a
                    mutually agreeable resolution to the dispute.  The costs of
                    any such mediation shall be shared equally by the parties.
                    Except where a party reasonably believes that irreparable
                    harm may occur and

- --------------------------------------------------------------------------------
                                                                    PAGE 6 of 11
<PAGE>

                    brings an action for injunction relief, the parties shall
                    follow the foregoing dispute resolution procedures prior to
                    commencing litigation.  In connection with any such dispute
                    or litigation, the provisions of the following paragraph
                    will apply.

             5.5.2  Prior to initiating any action hereunder (except for actions
                    for injunctive relief), the aggrieved party will provide
                    written notice to the other party and the parties will make
                    diligent good faith efforts to negotiate and resolve such
                    dispute in accordance with the foregoing dispute resolution
                    procedures.  The parties agree that in the event that it
                    becomes necessary to initiate any action hereunder (except
                    for actions in equity where an alternative forum is required
                    for immediate injunctive relief), the appropriate forum
                    shall be (a) for claims commenced by AFC, in a state or
                    federal court located in Cook County or DuPage County,
                    Illinois or (b) for claims commenced by Tellabs, in a state
                    or federal court located in Sonoma County, California.

     5.6     WAIVER.
             The failure of AFC or Tellabs to enforce a right under this
             Termination Agreement shall not act as a waiver of that right or
             the ability to assert that right relative to the particular
             situation involved.  The waiver by either party of a breach of any
             provisions contained in this Termination Agreement shall be
             effective only if set forth in a writing signed by both parties and
             shall in no way be construed as a waiver of any succeeding breach
             of such provision or the waiver of the provision itself.

     5.7     HEADINGS.
             Headings included herein are for convenience only and shall not be
             used to interpret or construe this Termination Agreement.

     5.8     SEVERABILITY.
             If any provision of this Termination Agreement shall be held void,
             invalid, illegal or unenforceable, that provision shall be limited
             or eliminated to the minimum extent necessary so that this
             Termination Agreement shall otherwise remain in full force and
             effect and enforceable.

     5.9     REMEDIES; INJUNCTIVE RELIEF.
             Except as expressly provided with respect to particular remedies,
             the rights and remedies of a party set forth herein with respect to
             failure of the other party to comply with the terms of this
             Termination Agreement are not exclusive, the exercise thereof shall
             not constitute an election of remedies and the aggrieved party
             shall in all events be entitled to seek

- --------------------------------------------------------------------------------
                                                                    PAGE 7 of 11
<PAGE>

             whatever additional remedies may be available in law or in equity
             (including, without limitation, appropriate injunctive relief).

     5.10    AGREEMENT CONTROLS.
             The terms of this Termination Agreement shall control over any
             contrary or inconsistent terms in any Attachment related hereto
             unless this Termination Agreement is specifically superseded in a
             written agreement signed by both parties.

     5.11    SUCCESSORS AND ASSIGNS.
             The provisions of this Termination Agreement shall inure to the
             benefit of, and be binding upon, AFC and Tellabs and their
             respective successors and permitted assigns.

     5.12    PUBLICITY.
             The parties agree to maintain the terms of this Termination
             Agreement in confidence.  Neither party shall directly or
             indirectly issue or permit the issuance of any publicity, news
             release or other public statement concerning this Termination
             Agreement or the terms hereof without the prior written approval of
             the other party; provided, however, that each party may make public
             disclosures as required by law or governmental regulation with
             reasonable prior notice to the other party.  Notwithstanding the
             foregoing, both parties shall be free to disclose the notice and
             substance of this Termination Agreement, as necessary, in
             connection with its annual report and SEC filings on Form 10-K and
             10-Q.

     5.13    COUNTERPARTS.
             This Termination Agreement may be executed in any number of
             counterparts, each of which shall be deemed to be an original, but
             all of which together shall constitute but one instrument.



- --------------------------------------------------------------------------------
                                                                    PAGE 8 of 11
<PAGE>


IN WITNESS WHEREOF, this Termination Agreement has been duly executed and
delivered by the parties as of the date first above written.


ADVANCED FIBRE
COMMUNICATIONS, INC.                    TELLABS OPERATIONS, INC.


By:    /s/ Carl Grivner                 By:    /s/ Brian J. Jackman
   ---------------------------             ---------------------------

Name:  Carl Grivner                     Name:  Brian J. Jackman

Title: President & COO                  Title: President

Date:  December 30, 1996                Date:  December 23, 1996
     -------------------------               -------------------------




- --------------------------------------------------------------------------------
                                                                    PAGE 9 of 11
<PAGE>




                                  ATTACHMENT A

                       J.V. COMPANY ASSETS RETAINED BY AFC







- --------------------------------------------------------------------------------
                                                                   PAGE 10 OF 11
<PAGE>

ADVANCED ACCESS LABS     FIXED ASSETS

ENGINEERING, COMPUTER EQUIPMENT  & CUBICLE FURNITURE
12/18/96     11:24

<TABLE>
<CAPTION>

Beginning                                                                                              Jan-96     Feb-96     Mar-96
Purchases        Date Rec'd  Description                                                 Total
- -----------------------------------------------------------------------------------------------------------------------------------
<S>              <C>         <C>                                                         <C>           <C>        <C>        <C>
Arco Manhattan    01-Jun-94  Refurbished Action Office Stations                          14,590.55     188.17     188.17     188.17
CB Technical
  Source          08-Dec-95  AAL Test Lab Work Benches (4 ea)                             5,701.80     407.27      73.54      73.54
Global Equipment  12-Dec-95  AAL Test Lab Cabinet                                           215.00      15.36       2.77       2.77
Global Equipment  12-Dec-95  AAL Test Lab Adjustable Stools (5 ea)                          473.75      33.84       6.11       6.11
Global Equipment  12-Dec-95  AAL Test Lab Storage Center                                  1,847.26     131.95      23.82      17.67
Global Equipment  24-Jan-96  AAL Test Lab Drawer Unit                                     2,120.50
                             ACCOUNT 1500                                                24,948.86     776.59     294.41     288.26
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------

Elek-Tek          31-Mar-94  Presario 486-66                                            $14,560.00     187.77     187.77     187.77
Elek-Tek          31-Mar-94  Presario 486-66                                             $2,080.00      26.83      26.83      26.83
Elek-Tek          31-Mar-94  4 MB RAM UG                                                 $1,365.00      17.60      17.60      17.60
Elek-Tek          31-Mar-94  8 MB RAM UG                                                 $1,199.97      15.48      15.48      15.48
Elek-Tek          31-Mar-94  4 MB RAM                                                      $195.00       2.51       2.51       2.51
Elek-Tek          31-Mar-94  8 MG RAM                                                      $399.99       5.16       5.16       5.16
Elek-Tek          31-Mar-94  Eagle NE2000T                                                 $439.99       5.67       5.67       5.67
Elek-Tek          31-Mar-94  HP Laserjet Printer-returned 4/26/94 (See May 5 94)             $0.00       0.00       0.00       0.00
Elek-Tek          31-Mar-94  HP Ethernet Interface - returned 4/26/94 (See May 5 94)         $0.00       0.00       0.00       0.00
Elek-Tek          31-Mar-94  Modem                                                         $139.99       1.81       1.81       1.81
Elek-Tek          31-Mar-94  Netware                                                     $1,499.99      19.35      19.35      19.35
Elek-Tek          31-Mar-94  17" Sony Monitor                                            $1,199.00      15.46      15.46      15.46
Elek-Tek          31-Mar-94  17" Sony Monitor                                            $1,199.00      15.46      15.46      15.46
Elek-Tek          31-Mar-94  17" Sony Monitor                                            $1,199.00      15.46      15.46      15.46
Elek-Tek          31-Mar-94  21" Nec Monitor                                             $2,099.99      27.08      27.08      27.08
Elek-Tek          31-Mar-94  21" Nec Monitor - Returned 5/13/94 - Replaced below             $0.00       0.00       0.00       0.00
Elek-Tek          31-Mar-94  14" Nec Monitor                                               $345.00       4.45       4.45       4.45
Elek-Tek          01-Apr-94  650 W UPS                                                     $344.00       4.44       4.44       4.44
Elek-Tek          01-Apr-94  17" Sony Monitor                                            $1,199.00      15.46      15.46      15.46
Elek-Tek          04-Apr-94  Proliant 486-66                                             $5,875.00      75.77      75.77      75.77
Elek-Tek          06-Apr-94  Floppy Drive 3/12                                              $65.00       0.84       0.84       0.84
Elek-Tek          06-Apr-94  Think Pad 350                                               $5,367.00      69.22      69.22      69.22
Elek-Tek          06-Apr-94  2.2 AJ Bat IBM 350                                             $90.00       1.16       1.16       1.16
Elek-Tek          06-Apr-94  4 MG RAM 350                                                  $636.00       8.20       8.20       8.20
Elek-Tek          19-Apr-94  Eagle 5pk                                                     $439.99       5.67       5.67       5.67
Elek-Tek          20-Apr-94  3 PORT 10 BANE-T HIL (Twisted Pair)                           $341.00       4.40       4.40       4.40
Elek-Tek          25-Apr-94  21" Nec Monitor                                             $2,149.99      27.73      27.73      27.73
Elek-Tek          25-Apr-94  21" Nec Monitor                                             $2,149.99      27.73      27.73      27.73
Elek-Tek          25-Apr-94  21" Nec Monitor                                             $2,149.99      27.73      27.73      27.73
Elek-tek Inc      26-Apr-94  Returned HP laserjet & Interface - see Apr 94                    0.00       0.00       0.00       0.00
Elek-Tek          05-May-94  HP Laserjet 4M Plus Printer - HpC2039A w/rails               2,040.99      26.32      26.32      26.32
Elek-Tek          17-May-94  PCMCIA Ethernet 10Baset Cards                                 $636.49       8.21       8.21       8.21
Elek-Tek          02-Jun-94  Colorado PT25 Powertape 2.0 GB internal Tape Drive          $1,008.96      13.01      13.01      13.01
Belmont           02-Jun-94  486-66-PCI motherboard; mini tower; 32 mb Ram;               2,706.75      34.91      34.91      34.91
Belmont           02-Jun-94  500 mg IDE HD w/PCI Controller; No monitor                       0.00       0.00       0.00       0.00
Buerg             21-Jun-94  Downpayment on Nanao 17" monitor - see July 94                 642.31       8.92       8.92       8.92
Buerg             21-Jun-94  Nanao 17" monitor model 550 IW - See Jun & Aug               1,195.00      15.41      15.41      15.41
Arrow Elec        29-Jun-94  PLASAP 2 ALTERA D (Bit Blaster rec'd Aug 94)                 1,995.00      25.73      25.73      25.73
Elek-Tek          30-Jun-94  Sales Tax & Freight on all items purchased to date          $2,190.22      28.25      28.25      28.25
Immecor           15-Jul-94  486/66; 16 mg ram; local bus; IDE Controller; 200 mb HD;     2,560.00      33.02      33.02      33.02
Immecor           15-Jul-94  Air motherboard; 256 cache Nanoa 17" Monitor                     0.00       0.00       0.00       0.00
Immecor           15-Jul-94  #9 Vesa with 53 Chipset GXEG4PRO                                 0.00       0.00       0.00       0.00
Buerg             25-Aug-94  Credit memo for down payment on 17" monitor - see Jul & Aug   (642.31)   (115.97)     (8.92)     (8.92)
Buerg             25-Aug-94  Credit memo for down payment on 17" monitor - see Jun & Jul      0.00       0.00       0.00       0.00
Immecor           09-Sep-94  486/66; Auto Cad WS nano monitor 550/w;                      3,960.00      51.07      51.07      51.07
Immecor           09-Sep-94  32 mb ram; 540 mb HD; mouse model 34120                          0.00       0.00       0.00       0.00
Immecor           09-Sep-94  local bus controller; med. tower                                 0.00       0.00       0.00       0.00
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>

Beginning                                                                                 Q1 FY96    Net Book  Total Depr    AFC
Purchases        Date Rec'd  Description                                                    Depr      Value     By Asset   KEEPING
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                    thru 1996  thru 1996
<S>              <C>         <C>                                                          <C>       <C>        <C>        <C>
Arco Manhattan    01-Jun-94  Refurbished Action Office Stations                             564.52  10,725.79   3,864.76  10,725.79
CB Technical
  Source          08-Dec-95  AAL Test Lab Work Benches (4 ea)                               554.34   5,147.46     554.34   5,147.46
Global Equipment  12-Dec-95  AAL Test Lab Cabinet                                            20.90     194.10      20.90     194.10
Global Equipment  12-Dec-95  AAL Test Lab Adjustable Stools (5 ea)                           46.06     427.69      46.06     427.69
Global Equipment  12-Dec-95  AAL Test Lab Storage Center                                    173.44   1,673.82     173.44   1,673.82
Global Equipment  24-Jan-96  AAL Test Lab Drawer Unit                                                2,120.50       0.00   2,120.50
                             ACCOUNT 1500                                                 1,359.26  20,289.35   4,659.50  20,289.35
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------

Elek-Tek          31-Mar-94  Presario 486-66                                                563.30  10,703.48   3,856.52
Elek-Tek          31-Mar-94  Presario 486-66                                                 80.48   1,529.05     550.95
Elek-Tek          31-Mar-94  4 MB RAM UG                                                     52.81   1,003.44     361.56
Elek-Tek          31-Mar-94  8 MB RAM UG                                                     46.43     882.12     317.85
Elek-Tek          31-Mar-94  4 MB RAM                                                         7.54     143.35      51.65
Elek-Tek          31-Mar-94  8 MG RAM                                                        15.48     294.04     105.95
Elek-Tek          31-Mar-94  Eagle NE2000T                                                   17.02     323.45     116.54
Elek-Tek          31-Mar-94  HP Laserjet Printer-returned 4/26/94 (See May 5 94)              0.00       0.00       0.00
Elek-Tek          31-Mar-94  HP Ethernet Interface - returned 4/26/94 (See May 5 94)          0.00       0.00       0.00
Elek-Tek          31-Mar-94  Modem                                                            5.42     102.91      37.08
Elek-Tek          31-Mar-94  Netware                                                         58.04   1,102.67     397.32
Elek-Tek          31-Mar-94  17" Sony Monitor                                                46.39     881.41     317.59
Elek-Tek          31-Mar-94  17" Sony Monitor                                                46.39     881.41     317.59
Elek-Tek          31-Mar-94  17" Sony Monitor                                                46.39     881.41     317.59
Elek-Tek          31-Mar-94  21" Nec Monitor                                                 81.25   1,543.74     556.25
Elek-Tek          31-Mar-94  21" Nec Monitor - Returned 5/13/94 - Replaced below              0.00       0.00       0.00
Elek-Tek          31-Mar-94  14" Nec Monitor                                                 13.35     253.62      91.38
Elek-Tek          01-Apr-94  650 W UPS                                                       13.31     252.88      91.12
Elek-Tek          01-Apr-94  17" Sony Monitor                                                46.39     881.41     317.59
Elek-Tek          04-Apr-94  Proliant 486-66                                                227.31   4,318.82   1,556.18
Elek-Tek          06-Apr-94  Floppy Drive 3/12                                                2.51      47.78      17.22
Elek-Tek          06-Apr-94  Think Pad 350                                                  207.65   3,945.38   1,421.62
Elek-Tek          06-Apr-94  2.2 AJ Bat IBM 350                                               3.48      66.16      23.84
Elek-Tek          06-Apr-94  4 MG RAM 350                                                    24.61     467.54     168.46
Elek-Tek          19-Apr-94  Eagle 5pk                                                       17.02     323.45     116.54
Elek-Tek          20-Apr-94  3 PORT 10 BANE-T HIL (Twisted Pair)                             13.19     250.68      90.32
Elek-Tek          25-Apr-94  21" Nec Monitor                                                 83.18   1,580.50     569.49
Elek-Tek          25-Apr-94  21" Nec Monitor                                                 83.18   1,580.50     569.49
Elek-Tek          25-Apr-94  21" Nec Monitor                                                 83.18   1,580.50     569.49
Elek-tek Inc      26-Apr-94  Returned HP laserjet & Interface - see Apr 94                    0.00       0.00       0.00
Elek-Tek          05-May-94  HP Laserjet 4M Plus Printer - HpC2039A w/rails                  78.97   1,500.37     540.62
Elek-Tek          17-May-94  PCMCIA Ethernet 10Baset Cards                                   24.63     467.90     168.59
Elek-Tek          02-Jun-94  Colorado PT25 Powertape 2.0 GB internal Tape Drive              39.04     741.71     267.25
Belmont           02-Jun-94  486-66-PCI motherboard; mini tower; 32 mb Ram;                 104.73   1,989.78     716.97   1,989.78
Belmont           02-Jun-94  500 mg IDE HD w/PCI Controller; No monitor                       0.00       0.00       0.00       0.00
Buerg             21-Jun-94  Downpayment on Nanao 17" monitor - see July 94                  26.76     508.50     133.81
Buerg             21-Jun-94  Nanao 17" monitor model 550 IW - See Jun & Aug                  46.24     878.47     316.53
Arrow Elec        29-Jun-94  PLASAP 2 ALTERA D (Bit Blaster rec'd Aug 94)                    77.19   1,466.56     528.44
Elek-Tek          30-Jun-94  Sales Tax & Freight on all items purchased to date              84.74   1,610.07     580.15
Immecor           15-Jul-94  486/66; 16 mg ram; local bus; IDE Controller; 200 mb HD;        99.05   1,881.90     678.10   1,881.90
Immecor           15-Jul-94  Air motherboard; 256 cache Nanoa 17" Monitor                     0.00       0.00       0.00       0.00
Immecor           15-Jul-94  #9 Vesa with 53 Chipset GXEG4PRO                                 0.00       0.00       0.00       0.00
Buerg             25-Aug-94  Credit memo for down payment on 17" monitor - see Jul & Aug   (133.81)   (508.50)   (133.81)
Buerg             25-Aug-94  Credit memo for down payment on 17" monitor - see Jun & Jul      0.00       0.00       0.00
Immecor           09-Sep-94  486/66; Auto Cad WS nano monitor 550/w;                        153.21   2,911.07   1,048.93   2,911.07
Immecor           09-Sep-94  32 mb ram; 540 mb HD; mouse model 34120                          0.00       0.00       0.00       0.00
Immecor           09-Sep-94  local bus controller; med. tower                                 0.00       0.00       0.00       0.00
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                         Page 1
</TABLE>

<PAGE>


ADVANCED ACCESS LABS              FIXED ASSETS

ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
 12/18/96  11:24


<TABLE>
<CAPTION>

Beginning                                                                                             Jan-96   Feb-96    Mar-96
Purchases          Date Rec'd   Description                                           Total                                    
- -------------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------------
<S>             <C>          <C>                                                         <C>         <C>      <C>       <C>     
Immecor          16-Sep-94   Houston Inst. Jet Pro V100 Plotter w/sheet                   2,274.00    29.33    29.33     29.33  
Immecor          16-Sep-94   feeder & 4mb memory                                              0.00     0.00     0.00      0.00  
Immecor           9-Nov-94   Add'l for PCI card for computer on PO7004                      795.00    10.25    10.25     10.25  
Immecor           9-Nov-94   See PO 7004 in September                                         0.00     0.00     0.00      0.00  
Immecor          28-Dec-94   486-66 Computer                                              1,890.00    24.38    24.38     24.38  
Immecor           7-Jan-95   IBM Thinkpad, 3Com Ethernet Card,                                0.00     0.00     0.00      0.00  
Immecor           7-Jan-95   PCMCIA 14400 Fax, 4mb memory                                $6,000.00    77.38    77.38     77.38  
Elek-Tek, Inc    21-Mar-95   Prolinea mt 486dx2/66 420mb HD                              $3,467.52    44.72    44.72     44.72  
Elek-Tek, Inc    21-Mar-95   8mb MOD Compaq Prolinea, Presar                               $828.94    10.69    10.69     10.69  
Elek-Tek, Inc    21-Mar-95   Sony CGDM 17" 25mm Color Monitor                            $2,000.74    25.80    25.80     25.80  
Elek-Tek, Inc    21-Mar-95   Viking 8 MB Mod Compaq Prolinea Presar                      $1,673.53    21.58    21.58     21.58  
Elek-Tek, Inc    21-Mar-95   Reveal Dbl Speed CD-Rom Kit                                   $868.00    11.19    11.19     11.19  
Elek-Tek, Inc    21-Mar-95   TLBC-900Lan 650 Watt Standby Power                          $1,170.73    15.10    15.10     15.10  
Elek-Tek, Inc    21-Mar-95   MAC-Newton Messagepad                                         $759.50     9.80     9.80      9.80  
Elek-Tek, Inc    21-Mar-95   MAC-Newton 4 MB Flash Storage Card                            $244.13     3.15     3.15      3.15  
Elek-Tek, Inc    21-Mar-95   MAC-Carrycase                                                  $21.70     0.28     0.28      0.28  
Elek-Tek, Inc    21-Mar-95   MAC-Battery Charger                                            $96.57     1.25     1.25      1.25  
Elek-Tek, Inc    21-Mar-95   MAC-AC Power Adapter                                           $31.47     0.41     0.41      0.41  
Elek-Tek, Inc    22-Mar-95   4 MB Simm Module Memory                                       $846.30    10.91    10.91     10.91  
Elek-Tek, Inc    22-Mar-95   Viking 8 MB Mod Compaq Prolinea Presar                        $752.99     9.71     9.71      9.71  
Elek-Tek, Inc    22-Mar-95   Intelodx2dpr66 Overdrive Processor                            $648.83     8.37     8.37      8.37  
Elek-Tek, Inc    22-Mar-95   Mouseman II                                                   $106.33     1.37     1.37      1.37  
Elek-Tek, Inc    22-Mar-95   Logitech Mouse Serial                                          $31.47     0.41     0.41      0.41  
Elek-Tek, Inc    22-Mar-95   Multisync\XE 21" Color Monitor                              $2,313.68    29.84    29.84     29.84  
Elek-Tek, Inc    22-Mar-95   Eagle NE2000T Plus                                            $800.73    10.33    10.33     10.33  
Elek-Tek, Inc    22-Mar-95   Viking 4 MB Mod Compaq Prolinea Presar                      $1,261.00    16.26    16.26     16.26  
                 23-Mar-95   Intelodx2dpr66 Overdrive Processor                            $653.42     8.43     8.43      8.43  
Elek-Tek, Inc    23-Mar-95   Mac-H0029LL/B Newton Connection Pro Kit/Win                   $107.42     1.39     1.39      1.39  
Elek-Tek, Inc    24-Mar-95   Reveal Dbl Speed CD-Rom Kit                                   $481.03     6.20     6.20      6.20  
Elek-Tek, Inc    24-Mar-95   CQRails Compaq Prolinea/Presario                               $52.01     0.67     0.67      0.67  
Elek-Tek, Inc    24-Mar-95   NEC Multisync 21" Color Monitor                             $6,812.68    87.86    87.86     87.86  
Elek-Tek, Inc    27-Mar-95   CQDesk Prolinea MT 486DX2/66 4/420MB SPO                    $6,893.90    88.91    88.91     88.91  
Elek-Tek, Inc    29-Mar-95   MAC-Recharge Battery                                           $21.69     0.28     0.28      0.28  
Elek-Tek, Inc    29-Mar-95   MAC-Newton Telescoping Pen                                     $10.85     0.14     0.14      0.14  
Elek-Tek, Inc     3-Apr-95   MAC-Newton Fax Modem                                          $194.22     2.50     2.50      2.50  
Elek-Tek, Inc    17-Apr-95   Multisync \XE 21" Color Monitor                             $2,319.81    29.92    29.92     29.92  
Elek-Tek, Inc    17-Apr-95   CGACCE Pluggable SCSI-2 Drive                               $3,007.62    38.79    38.79     38.79  
Micro City        4-May-95   Deskporte Fast                                                $520.54     6.71     6.71      6.71  
Elek-Tek          5-May-95   900VA/650 Watt Standby Power (DWG)                            $387.81     5.00     5.00      5.00  
Corporate Sys    13-May-95   External Yamaha CD-Rom CD-R writer s/n 1120491              $3,535.00    45.59    45.59     45.59  
Corporate Sys    13-May-95   Komag erase optical ???                                     $1,470.00    18.96    18.96     18.96  
Corporate Sys    13-May-95   Premium peripheral cable 3ft centronic 50pin to 50 pin         $38.00     0.49     0.49      0.49  
Corporate Sys    13-May-95   1542CF Adaptec 16 bit SCSI Controller                         $195.00     2.51     2.51      2.51  
Corporate Sys    13-May-95   1542CF Adaptec 16 bit SCSI Controller                         $100.00     1.29     1.29      1.29  
Corporate Sys    13-May-95   Corel CD-Writer Software                                      $295.00     3.80     3.80      3.80  
Corporate Sys    13-May-95   CD-R75 Maxell recordable DC                                   $287.50     3.71     3.71      3.71  
Corporate Sys    13-May-95   JB10 Erasable optical jukebox                               $2,995.00    38.63    38.63     38.63  
Elek-Tek, Inc    15-May-95   (4)  8mb Simm 70ns Memory                                   $1,264.00    16.30    16.30     16.30  
Elek-Tek, Inc    15-May-95   (5) Eagle NE2000 Plus Enet 8/16 (Returned)                      $0.00     0.00     0.00      0.00  
Elek-Tek, Inc    15-May-95   (7) Overdrive Processors 486/100 & Prolinea/Pres Rails      $1,953.85    25.20    25.20     25.20  
Elek-Tek         16-May-95   Starion Pentium 100 CD-MT 1GB                               $6,031.07    77.78    77.78     77.78  
Elek-Tek         16-May-95   Multisync XE 21" Color Monitor                              $4,186.00    53.99    53.99     53.99  
Elek-Tek         16-May-95   Starion Pentium 100 CD-MT 1GB                               $2,588.00    33.38    33.38     33.38  
Elek-Tek         16-May-95   Multisync XE 21" Color Monitor                              $4,812.59    62.07    62.07     62.07  
Elek-Tek         17-May-95   Eagle Ne2000T Plus 8/16 Bit                                   $360.00     4.64     4.64      4.64  











                                                                                   Q1 FY96   Net Book   Total Depr   AFC KEEPING
                                                                                     Depr      Value     By Asset
                                                                                             thru 1996  thru 1996
- --------------------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------------------
<S>           <C>         <C>                                                       <S>       <S>         <S>        <S>
Immecor        16-Sep-94  Houston Inst. Jet Pro V100 Plotter w/sheet                 87.88    1,671.66     602.34     1,671.66
Immecor        16-Sep-94  feeder & 4mb memory                                         0.00        0.00       0.00         0.00
Immecor         9-Nov-94  Add'l for PCI card for computer on PO7004                  30.76      584.42     210.58       584.42
Immecor         9-Nov-94  See PO 7004 in September                                    0.00        0.00       0.00         0.00
Immecor        28-Dec-94  486-66 Computer                                            73.13    1,389.38     500.63     1,389.38
Immecor         7-Jan-95  IBM Thinkpad, 3Com Ethernet Card,                           0.00        0.00       0.00
Immecor         7-Jan-95  PCMCIA 14400 Fax, 4mb memory                              232.14    5,339.29     660.71
Elek-Tek, Inc  21-Mar-95  Prolinea mt 486dx2/66 420mb HD                            134.16    3,085.68     381.84
Elek-Tek, Inc  21-Mar-95  8mb MOD Compaq Prolinea, Presar                            32.07      737.66      91.28
Elek-Tek, Inc  21-Mar-95  Sony CGDM 17" 25mm Color Monitor                           77.41    1,780.42     220.32
Elek-Tek, Inc  21-Mar-95  Viking 8 MB Mod Compaq Prolinea Presar                     64.75    1,489.24     184.29
Elek-Tek, Inc  21-Mar-95  Reveal Dbl Speed CD-Rom Kit                                33.58      772.42      95.58
Elek-Tek, Inc  21-Mar-95  TLBC-900Lan 650 Watt Standby Power                         45.30    1,041.81     128.92
Elek-Tek, Inc  21-Mar-95  MAC-Newton Messagepad                                      29.39      675.86      83.64
Elek-Tek, Inc  21-Mar-95  MAC-Newton 4 MB Flash Storage Card                          9.45      217.25      26.88
Elek-Tek, Inc  21-Mar-95  MAC-Carrycase                                               0.84       19.31       2.39
Elek-Tek, Inc  21-Mar-95  MAC-Battery Charger                                         3.74       85.94      10.63
Elek-Tek, Inc  21-Mar-95  MAC-AC Power Adapter                                        1.22       28.00       3.47
Elek-Tek, Inc  22-Mar-95  4 MB Simm Module Memory                                    32.74      753.11      93.19
Elek-Tek, Inc  22-Mar-95  Viking 8 MB Mod Compaq Prolinea Presar                     29.13      670.07      82.92
Elek-Tek, Inc  22-Mar-95  Intelodx2dpr66 Overdrive Processor                         25.10      577.38      71.45
Elek-Tek, Inc  22-Mar-95  Mouseman II                                                 4.11       94.62      11.71
Elek-Tek, Inc  22-Mar-95  Logitech Mouse Serial                                       1.22       28.00       3.47
Elek-Tek, Inc  22-Mar-95  Multisync\XE 21" Color Monitor                             89.52    2,058.90     254.78
Elek-Tek, Inc  22-Mar-95  Eagle NE2000T Plus                                         30.98      712.55      88.18
Elek-Tek, Inc  22-Mar-95  Viking 4 MB Mod Compaq Prolinea Presar                     48.79    1,122.14     138.86
               23-Mar-95  Intelodx2dpr66 Overdrive Processor                         25.28      581.47      71.95
Elek-Tek, Inc  23-Mar-95  Mac-H0029LL/B Newton Connection Pro Kit/Win                 4.16       95.59      11.83
Elek-Tek, Inc  24-Mar-95  Reveal Dbl Speed CD-Rom Kit                                18.61      428.06      52.97
Elek-Tek, Inc  24-Mar-95  CQRails Compaq Prolinea/Presario                            2.01       46.28       5.73
Elek-Tek, Inc  24-Mar-95  NEC Multisync 21" Color Monitor                           263.59    6,062.47     750.21
Elek-Tek, Inc  27-Mar-95  CQDesk Prolinea MT 486DX2/66 4/420MB SPO                  266.73    6,134.75     759.15
Elek-Tek, Inc  29-Mar-95  MAC-Recharge Battery                                        0.84       19.30       2.39
Elek-Tek, Inc  29-Mar-95  MAC-Newton Telescoping Pen                                  0.42        9.66       1.19
Elek-Tek, Inc   3-Apr-95  MAC-Newton Fax Modem                                        7.51      172.83      21.39
Elek-Tek, Inc  17-Apr-95  Multisync \XE 21" Color Monitor                            89.75    2,064.35     255.46
Elek-Tek, Inc  17-Apr-95  CGACCE Pluggable SCSI-2 Drive                             116.37    2,676.42     331.20
Micro City      4-May-95  Deskporte Fast                                             20.14      463.22      57.32
Elek-Tek        5-May-95  900VA/650 Watt Standby Power (DWG)                         15.00      345.10      42.71
Corporate Sys  13-May-95  External Yamaha CD-Rom CD-R writer s/n 1120491            136.77    3,145.73     389.27
Corporate Sys  13-May-95  Komag erase optical ???                                    56.88    1,308.13     161.88
Corporate Sys  13-May-95  Premium peripheral cable 3ft centronic 50pin to 50 pins     1.47       33.82       4.18
Corporate Sys  13-May-95  1542CF Adaptec 16 bit SCSI Controller                       7.54      173.53      21.47
Corporate Sys  13-May-95  1542CF Adaptec 16 bit SCSI Controller                       3.87       88.99      11.01
Corporate Sys  13-May-95  Corel CD-Writer Software                                   11.41      262.51      32.49
Corporate Sys  13-May-95  CD-R75 Maxell recordable DC                                11.12      255.84      31.66
Corporate Sys  13-May-95  JB10 Erasable optical jukebox                             115.88    2,665.19     329.81
Elek-Tek, Inc  15-May-95  (4)  8mb Simm 70ns Memory                                  48.90    1,124.81     139.19
Elek-Tek, Inc  15-May-95  (5) Eagle NE2000 Plus Enet 8/16 (Returned)                  0.00        0.00       0.00
Elek-Tek, Inc  15-May-95  (7) Overdrive Processors 486/100 & Prolinea/Pres Rails     75.60    1,738.69     215.16
Elek-Tek       16-May-95  Starion Pentium 100 CD-MT 1GB                             233.34    5,366.93     664.14
Elek-Tek       16-May-95  Multisync XE 21" Color Monitor                            161.96    3,725.04     460.96
Elek-Tek       16-May-95  Starion Pentium 100 CD-MT 1GB                             100.13    2,303.01     284.99
Elek-Tek       16-May-95  Multisync XE 21" Color Monitor                            186.20    4,282.63     529.96
Elek-Tek       17-May-95  Eagle Ne2000T Plus 8/16 Bit                                13.93      320.36      39.64

</TABLE>

<PAGE>


ADVANCED ACCESS LABS             FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
   12/18/96 11:24
<TABLE>
<CAPTION>
Beginning                                                                                             Jan-96    Feb-96    Mar-96 
Purchases        Date Rec'd     Description                                                Total                                 
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
<S>              <C>                                                                   <C>          <C>       <C>       <C>
Elec-Tek         17-May-95 8bm (2/32) Simm 70ns 72 pin                                   $1,410.57     18.19     18.19     18.19 
Elec-Tek         18-May-95 Starion Pentium 100 CD-MT 1 GB                                $2,823.72     36.42     36.42     36.42 
Elec-Tek         24-Jul-95 (2ea)Toshiba Notebook 486DX2/50 260 MB HD                     $3,225.23     41.60     41.60     41.60 
Elec-Tek         24-Jul-95 (2ea)Logitech Mouseman                                           $93.31      1.20      1.20      1.20 
Elec-Tek         24-Jul-95 MS Excel for Windows                                            $324.42      4.18      4.18      4.18 
Elec-Tek         26-Jul-95 (5ea)Eagle NE200oT Plus 16 Bit Enet Card                        $382.01      4.93      4.93      4.93 
Elec-Tek         26-Jul-95 Starion Pentium 100 CD-MT 1 GBHD                              $2,845.34     36.70     36.70     36.70 
Elec-Tek         26-Jul-95 (2ea) MIC8x32-70 Simm                                           $685.72      8.84      8.84      8.84 
Elec-Tek         26-Jul-95 Sony 17" Monitor                                              $1,076.32     13.88     13.88     13.88 
Elec-Tek         26-Jul-95 Performance PCMCIA Ether 1-BT Modem                             $321.16      4.14      4.14      4.14 
Elec-Tek         26-Jul-95 Starion Pentium 100 CD-MT 1 GBHD                              $2,831.82     36.52     36.52     36.52 
Elec-Tek         26-Jul-95 (2ea) MIC8x32-70 Simm                                           $686.72      8.84      8.84      8.84 
Elec-Tek         26-Jul-95 X-Jack PCMCIA 14.4 Fax Modem                                    $190.96      2.46      2.46      2.46 
Elec-Tek         26-Jul-95 See Invoice #411306- I can't read this copy                     $779.03     10.05     10.05     10.05 
Elec-Tek         24-Jul-95 16mb mod IBM Thinkpad                                           $840.25     10.84     10.84     10.84 
Elec-Tek         16-Nov-95 Pcmcia 14.4 Fax Modem (2ea)                                     $354.73     25.34      4.57      4.57 
Elec-Tek         16-Nov-95 Pcmcia 28.8 Fax Modem (1ea)                                     $302.72     21.62      3.90      3.90 
Elec-Tek         16-Nov-95 Reveal CD Rom Kit (1ea)                                         $216.99     15.50      2.80      2.80 
Elec-Tek         16-Nov-95 Black Nylon Case for Notepad (6ea)                              $216.95     15.50      2.80      2.80 
Elec-Tek         29-Nov-95 2.2AH Nimh Battery Pack/350 (3ea)                               $293.53     20.97      3.79      3.79 
Elec-Tek          5-Dec-95 Viking 8mb Mod IBM Thinkpad                                     $447.83     31.99      5.78      5.78 
Elec-Tek         11-Dec-95 Presario Pentium 100 CD 16/1.6 (2ea)                          $5,174.56    369.91     66.74     66.74 
Elec-Tek         11-Dec-95 Nec Multisync 17" Color Monitor (2ea)                         $1,733.83    123.85     22.36     22.36 
Elec-Tek         13-Dec-95 UPG Netware                                                   $3,484.79    248.91     44.94     44.94 
Elec-Tek         15-Dec-95 Nec Multisync 21" Color Monitor (4ea)                         $8,286.17    591.87    106.87    106.87 
Elec-Tek         15-Dec-95 Presario Pentium 100 CD (4ea)                                $10,275.40    733.96    132.52    132.52 
Immecor          11-Oct-95 Intell zapa P100, 16MgRam; 1.05 GbHD;PCI Graphics;            $2,540.00    181.43     32.76     32.76 
Immecor          11-Oct-95 Nanao 17" .28 Monitor                                           $890.00     63.57     11.48     11.48 
Immecor          17-Nov-95 HP Office Jet Printer                                           $643.93     46.00      8.30      7.73 
Immecor           5-Dec-95 16mb Simm  Memory                                               $569.00     40.64      7.34      7.34 
Immecor           5-Dec-95 4X IDE CD Rom Drive                                             $169.00     12.07      2.18      2.18 
Elec-Tek, Inc.   31-Jan-96 (3) Presario P100 w CDRom, Multisync 17" Monitor             $10,362.39                               
Elec-Tek, Inc.   31-Jan-96 (2) Eagle 883002670 Plus 10BT Enet 5pk                          $720.80                               
Elec-Tek, Inc.   31-Jan-96 (2) IBM Battery Packs; 16mb Mod Compaq Prolinea, Presa        $1,489.79                               
Elec-Tek, Inc.   31-Jan-96 Multisync 21" Monitor                                         $2,084.15                               
Elec-Tek, Inc.   31-Jan-96 Multisync 21" Monitor(DA)                                     $2,084.15                               
Elec-Tek, Inc.   31-Jan-96 Lte 5000 Nb Pent75 8/810; Battery; 8mb kit; Combo(DA)             $0.00                               
Elec-Tek, Inc.   31-Jan-96 Pcmcia Fax/modem; Framemaker for Windows (DA)                 $6,725.49                               
Elec-Tek, Inc.   31-Jan-96 MsOffice & MS Project for Windows (DA)                        $1,013.49                               
Elec-Tek, Inc.   30-Mar-96 (2)4mb Mod IBM PS/1,PS/2 Memory                                 $298.88                               
Elec-Tek, Inc.   30-Mar-96 (4) 10Base-T Ethernet 8-port Conc                               $555.06                               
Elec-Tek, Inc.   30-Mar-96 Intel 486DX4 100 CPU                                            $133.44                               
Immecor          24-Jan-96 (4) 486/DX80;(4)Tatung 14" .28 Monitors                       $6,876.00                               
Immecor          24-Jan-96 (2) Sustem C-P100, 1.08GbHD,(2) 4XCDRom;                      $4,196.00                               
Immecor          24-Jan-96 (2) Nanao 17" Monitors                                        $1,780.00                               
                                                                                                                                 
                           ACCOUNT 1511                                                $239,914.08  4,576.57  2,599.92  2,599.34 
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                 
Cosmic Software  31-Jan-96 CDSH16 HC 16C Cross Compiler                                  $1,520.00                               
Cosmic Software  31-Jan-96 (5) CDSH 16 HC 16 Cross Compiler                              $6,410.00                               
                                                                                                                                 
                           ACCOUNT 1512                                                  $7,930.00                               
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                                                                 
Nohau            11-May-94 Emul 16/300-PC/QTR128-16.78 SN 232390(Trans from AF            4,298.63     55.44     55.44     55.44 
NoiseCom         14-Jul-94 Noise Source-Noise/Com NC6108 100-500 hz                       3,350.00     43.20     43.20     43.20 

<CAPTION>

Beginning                                                                           Q1 FY96  Net Book   Total Depr   AFC KEEPING
Purchases        Date Rec'd     Description                                                    Value     By Asset
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                                                             thru 1996   thru 1996
<S>              <C>       <C>                                                     <C>       <C>        <C>          <C>
Elec-Tek         17-May-95 8bm (2/32) Simm 70ns 72 pin                                54.58    1,256.24      155.33
Elec-Tek         18-May-95 Starion Pentium 100 CD-MT 1 GB                            109.25    2,512.77      310.95
Elec-Tek         24-Jul-95 (2ea)Toshiba Notebook 486DX2/50 260 MB HD                 124.79    2,870.07      355.16
Elec-Tek         24-Jul-95 (2ea)Logitech Mouseman                                      3.61       83.03       10.28
Elec-Tek         24-Jul-95 MS Excel for Windows                                       12.55      288.69       35.72
Elec-Tek         26-Jul-95 (5ea)Eagle NE200oT Plus 16 Bit Enet Card                   14.78      339.94       42.07
Elec-Tek         26-Jul-95 Starion Pentium 100 CD-MT 1 GBHD                          110.09    2,532.01      313.33
Elec-Tek         26-Jul-95 (2ea) MIC8x32-70 Simm                                      26.53      610.21       75.51
Elec-Tek         26-Jul-95 Sony 17" Monitor                                           41.64      957.80      118.52
Elec-Tek         26-Jul-95 Performance PCMCIA Ether 1-BT Modem                        12.43      285.79       35.37
Elec-Tek         26-Jul-95 Starion Pentium 100 CD-MT 1 GBHD                          109.56    2,519.98      311.84
Elec-Tek         26-Jul-95 (2ea) MIC8x32-70 Simm                                      26.53      610.21       75.51
Elec-Tek         26-Jul-95 X-Jack PCMCIA 14.4 Fax Modem                                7.39      169.93       21.03
Elec-Tek         26-Jul-95 See Invoice #411306- I can't read this copy                30.14      693.24       85.79
Elec-Tek         24-Jul-95 16mb mod IBM Thinkpad                                      32.51      747.72       92.53
Elec-Tek         16-Nov-95 Pcmcia 14.4 Fax Modem (2ea)                                34.49      320.24       34.49
Elec-Tek         16-Nov-95 Pcmcia 28.8 Fax Modem (1ea)                                29.43      273.28       29.43
Elec-Tek         16-Nov-95 Reveal CD Rom Kit (1ea)                                    21.10      195.89       21.10
Elec-Tek         16-Nov-95 Black Nylon Case for Notepad (6ea)                         21.09      195.85       21.09
Elec-Tek         29-Nov-95 2.2AH Nimh Battery Pack/350 (3ea)                          28.54      264.99       28.54
Elec-Tek          5-Dec-95 Viking 8mb Mod IBM Thinkpad                                43.54      404.29       43.54
Elec-Tek         11-Dec-95 Presario Pentium 100 CD 16/1.6 (2ea)                      503.08    4,671.48      503.08
Elec-Tek         11-Dec-95 Nec Multisync 17" Color Monitor (2ea)                     168.57    1,565.26      168.57
Elec-Tek         13-Dec-95 UPG Netware                                               338.80    3,145.99      338.80
Elec-Tek         15-Dec-95 Nec Multisync 21" Color Monitor (4ea)                     805.60    7,480.57      805.60
Elec-Tek         15-Dec-95 Presario Pentium 100 CD (4ea)                             999.00    9,276.40      999.00
Immecor          11-Oct-95 Intell zapa P100, 16MgRam; 1.05 GbHD;PCI Graphics;        246.94    2,293.06      246.94    2,293.06
Immecor          11-Oct-95 Nanao 17" .28 Monitor                                      86.53      803.47       86.53      803.47
Immecor          17-Nov-95 HP Office Jet Printer                                      62.02      581.91       62.02      581.91
Immecor           5-Dec-95 16mb Simm  Memory                                          65.32      513.68       55.32      513.68
Immecor           5-Dec-95 4X IDE CD Rom Drive                                        16.43      152.57       16.43      152.57
Elec-Tek, Inc.   31-Jan-96 (3) Presario P100 w CDRom, Multisync 17" Monitor                   10,362.39        0.00
Elec-Tek, Inc.   31-Jan-96 (2) Eagle 883002670 Plus 10BT Enet 5pk                                720.80        0.00
Elec-Tek, Inc.   31-Jan-96 (2) IBM Battery Packs; 16mb Mod Compaq Prolinea, Presa              1,489.79        0.00
Elec-Tek, Inc.   31-Jan-96 Multisync 21" Monitor                                               2,084.15        0.00
Elec-Tek, Inc.   31-Jan-96 Multisync 21" Monitor(DA)                                           2,084.15        0.00    2,084.15
Elec-Tek, Inc.   31-Jan-96 Lte 5000 Nb Pent75 8/810; Battery; 8mb kit; Combo(DA)                   0.00        0.00
Elec-Tek, Inc.   31-Jan-96 Pcmcia Fax/modem; Framemaker for Windows (DA)                       6,725.49        0.00
Elec-Tek, Inc.   31-Jan-96 MsOffice & MS Project for Windows (DA)                              1,013.49        0.00    1,013.49
Elec-Tek, Inc.   30-Mar-96 (2)4mb Mod IBM PS/1,PS/2 Memory                                       298.88        0.00
Elec-Tek, Inc.   30-Mar-96 (4) 10Base-T Ethernet 8-port Conc                                     555.06        0.00
Elec-Tek, Inc.   30-Mar-96 Intel 486DX4 100 CPU                                                  133.44        0.00
Immecor          24-Jan-96 (4) 486/DX80;(4)Tatung 14" .28 Monitors                             6,876.00        0.00    6,876.00
Immecor          24-Jan-96 (2) Sustem C-P100, 1.08GbHD,(2) 4XCDRom;                            4,196.00        0.00    4,196.00
Immecor          24-Jan-96 (2) Nanao 17" Monitors                                              1,780.00        0.00    1,780.00
                                                                                                                    ------------
                                                                                                                    ------------
                           ACCOUNT 1511                                            9,775.82  207,034.58   32,879.51   30,722.54
- --------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------
                                                                                                   0.00        0.00
Cosmic Software  31-Jan-96 CDSH16 HC C Cross Compiler                                          1,520.00        0.00
Cosmic Software  31-Jan-96 (5) CDSH 16 HC 16 Cross Compiler                                    6,410.00        0.00
                                                                                                   0.00        0.00
                           ACCOUNT 1512                                                        7,930.00        0.00
- --------------------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------------------
                                                                                                   0.00        0.00
Nohau            11-May-94 Emul 16/300-PC/QTR128-16.78 SN 232390(Trans from AF       166.32    3,160.00    1,138.63
NoiseCom         14-Jul-94 Noise Source-Noise/Com NC6108 100-500 hz                  129.61    2,462.65      887.35

</TABLE>

<PAGE>

ADVANCED ACCESS LABS                       FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
  12/18/96 11:24

<TABLE>
<CAPTION>

Beginning                                                                                                                Jan-96
Purchases                Date Rec'd        Description                                                 Total
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                      <C>               <C>                                                        <C>                <C>
NoiseCom                   18-Jul-94       Noise Source -Noise/Com NC6105 10 hz- 10mhz                2,750.00             35.47
Nohau                      26-Jul-94       Emul Board-Emul 51-PC/E32-16                               3,439.17             44.35
Nohau                      26-Jul-94       Bondoot Pod-C52-16                                         2,144.62             27.66
Nohau                      26-Jul-94       Adv Trace Board-Emul 51-PC/ATRG-4-16                       3,227.71             41.63
Nohau                      26-Jul-94       Stand. Trace Board-Emul 51-PC/TR16-16                      1,949.37             25.14
Tritek                     26-Jul-94       Kron-Hite 3202 Turnable Filter                             1,950.00             25.15
Test Equipment             28-Jul-94       HP 1645A-BER Test Set                                      1,862.00             24.01
Hewlett Packard            29-Jul-94       HP 5385A RF Frequency Counter                              2,290.00             29.53
Hewlett Packard            29-Jul-94       HP 4378 Power Meter                                        2,725.00             35.14
Hewlett Packard            29-Jul-94       HP 8483A Air Power Sensor                                    795.00             10.25
Nohau                       4-Aug-94       Emul Board - Emul 16/300-PC/EIM 16.78                      6,393.68             82.46
Nohau                       4-Aug-94       Pod - 16Z1/IM-16.78                                        2,449.91             31.60
Nohau                       4-Aug-94       Trace Board - Eml 16/30OPC/DTR128-16.78                    8,529.32            110.00
Nohau                       4-Aug-94       Adaptor - Emul 16/300PC/QFP132Clip                         1,910.82             24.64
Nohau                       4-Aug-94       High Level Dbug SW-Emul 16/30OPC/HLD-CPU16                 3,202.50             41.30
Nohau                       4-Aug-94       Pod - 161/2M-16.78                                         5,172.03             66.70
Telogy                      5-Aug-94       HP 8647A Signal Generator                                  5,374.65             69.32
Hewlett Packard             5-Aug-94       Amplifier & Preamplifier-HP8445F 50A                       2,930.00             37.79
Stanford Research          12-Aug-94       Synthisized Function Generator-SRSDS345 30 Mhz             2,845.00             36.69
Stanford Research          12-Aug-94       w/high stab time base                                          0.00              0.00
Arrow Electronics          24-Aug-94       Bit Blaster-Part of PL-ASAP2 Programmers with                495.00              6.38
Arrow Electronics          24-Aug-94       PLPG Card for PLMPV - See June 94                              0.00              0.00
Engineering Inventor       30-Sep-94       Per Rick Girvin-Will be transferred out at later date      1,025.00             13.22
Hewlett Packard             7-Oct-94       E4746A EESOF Touchstone RF Simulator                       9,995.00            128.90
Hewlett Packard             7-Oct-94       E5787A EESOF ESYN Filter Package                             995.00             12.83
Ameritec                   11-Oct-94       Armeritec AM2-DE Bulk Call Generator                      24,950.00            321.78
Ameritec                   11-Oct-94       Manual, Bantam 120 ohm inputs                                330.00              4.26
Advanced Fibre              2-Feb-95       Central Process Unit                                      $1,909.90             24.63
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                             $557.67              7.19
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                         $926.61             11.95
Advanced Fibre              2-Feb-95       Let Adv Intl Pots Chnl Unit                               $1,556.28             20.07
Advanced Fibre              2-Feb-95       RST Adv Intl Pots Chnl Unit                               $1,507.31             19.44
Advanced Fibre              2-Feb-95       T1 Transceiver (powered)                                  $1,919.79             24.76
Advanced Fibre              2-Feb-95       E1 Transceiver (powered)                                  $1,910.22             24.64
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                          $1,612.50             20.80
Advanced Fibre              2-Feb-95       Central Process Unit                                      $1,552.59             20.02
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                            $283.33              3.65
Advanced Fibre              2-Feb-95       Metallica Test Unit                                         $356.83              4.60
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                         $313.86              4.05
Advanced Fibre              2-Feb-95       LET Univ. Voice Grade Chnl Unit                             $310.27              4.00
Advanced Fibre              2-Feb-95       RST Univ. Voice Grade Chnl Unit                             $268.85              3.47
Advanced Fibre              2-Feb-95       T1 Asynch chnl Unit (DSX)                                   $711.78              9.18
Advanced Fibre              2-Feb-95       Let Pots Channel Unit                                       $242.49              3.13
Advanced Fibre              2-Feb-95       RST Pots Channel Unit                                       $281.15              3.63
Advanced Fibre              2-Feb-95       Fiber Optic Transceiver                                   $1,748.50             22.55
Advanced Fibre              2-Feb-95       T1 Transceiver (DSX)                                        $607.19              7.83
Advanced Fibre              2-Feb-95       E1 Transceiver (G.703)                                      $605.81              7.81
Advanced Fibre              2-Feb-95       Transmission Only Channel Unit                              $546.18              7.04
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                            $830.20             10.71
Ameritec                   15-May-95       C. O. Simulator, portable with Option AM7 DLC-96 Compt    $5,749.68             74.15
Ameritec                   15-May-95       DLC-96 Port Card                                          $9,000.00            116.07
Ameritec                   15-May-95       Am-7 Trunk Card                                             $940.00             12.12
Ameritec                   15-May-95       Dual Quad Tone Receiver Card                              $5,290.00             68.22
Ameritec                   15-May-95       1.544 77 Port Card                                        $1,765.00             22.76
Ameritec                   15-May-95       Back Mount Kit                                               $60.00              0.77

</TABLE>


ADVANCED ACCESS LABS                       FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
  12/18/96 11:24

<TABLE>
<CAPTION>

Beginning                                                                                               Feb-96         Mar-96  
Purchases                 Date Rec'd       Description                                                                         
- -------------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>              <C>                                                          <C>            <C>
NoiseCom                   18-Jul-94       Noise Source -Noise/Com NC6105 10 hz- 10mhz                   35.47         35.47  
Nohau                      26-Jul-94       Emul Board-Emul 51-PC/E32-16                                  44.35         44.35  
Nohau                      26-Jul-94       Bondoot Pod-C52-16                                            27.66         27.66  
Nohau                      26-Jul-94       Adv Trace Board-Emul 51-PC/ATRG-4-16                          41.63         41.63  
Nohau                      26-Jul-94       Stand. Trace Board-Emul 51-PC/TR16-16                         25.14         25.14  
Tritek                     26-Jul-94       Kron-Hite 3202 Turnable Filter                                25.16         25.16  
Test Equipment             28-Jul-94       HP 1645A-BER Test Set                                         24.01         24.01  
Hewlett Packard            29-Jul-94       HP 5385A RF Frequency Counter                                 29.53         29.53  
Hewlett Packard            29-Jul-94       HP 4378 Power Meter                                           35.24         35.24  
Hewlett Packard            29-Jul-94       HP 8483A Air Power Sensor                                     10.25         10.25  
Nohau                       4-Aug-94       Emul Board - Emul 16/300-PC/EIM 16.78                         82.46         82.46  
Nohau                       4-Aug-94       Pod - 16Z1/IM-16.78                                           31.60         31.60
Nohau                       4-Aug-94       Trace Board - Eml 16/30OPC/DTR128-16.78                      110.00        110.00  
Nohau                       4-Aug-94       Adaptor - Emul 16/300PC/QFP132Clip                            24.64         24.64  
Nohau                       4-Aug-94       High Level Dbug SW-Emul 16/30OPC/HLD-CPU16                    41.30         41.30
Nohau                       4-Aug-94       Pod - 161/2M-16.78                                            66.70         66.70
Telogy                      5-Aug-94       HP 8647A Signal Generator                                     69.32         69.32  
Hewlett Packard             5-Aug-94       Amplifier & Preamplifier-HP8445F 50A                          37.79         37.79  
Stanford Research          12-Aug-94       Synthisized Function Generator-SRSDS345 30 Mhz                36.69         36.69  
Stanford Research          12-Aug-94       w/high stab time base                                          0.00          0.00  
Arrow Electronics          24-Aug-94       Bit Blaster-Part of PL-ASAP2 Programmers with                  6.38          6.38  
Arrow Electronics          24-Aug-94       PLPG Card for PLMPV - See June 94                              0.00          0.00  
Engineering Inventor       30-Sep-94       Per Rick Girvin-Will be transferred out at later date         13.22         13.22  
Hewlett Packard             7-Oct-94       E4746A EESOF Touchstone RF Simulator                         128.90        128.90
Hewlett Packard             7-Oct-94       E5787A EESOF ESYN Filter Package                              12.83         12.83  
Ameritec                   11-Oct-94       Armeritec AM2-DE Bulk Call Generator                         321.78        321.78  
Ameritec                   11-Oct-94       Manual, Bantam 120 ohm inputs                                  4.26          4.26  
Advanced Fibre              2-Feb-95       Central Process Unit                                          24.63         24.63  
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                                7.19          7.19  
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                           11.95         11.95  
Advanced Fibre              2-Feb-95       Let Adv Intl Pots Chnl Unit                                   20.07         20.07  
Advanced Fibre              2-Feb-95       RST Adv Intl Pots Chnl Unit                                   19.44         19.44  
Advanced Fibre              2-Feb-95       T1 Transceiver (powered)                                      24.76         24.76  
Advanced Fibre              2-Feb-95       E1 Transceiver (powered)                                      24.64         24.64  
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                              20.80         20.80  
Advanced Fibre              2-Feb-95       Central Process Unit                                          20.02         20.02  
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                               3.65          3.65  
Advanced Fibre              2-Feb-95       Metallica Test Unit                                            4.60          4.60  
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                            4.05          4.05  
Advanced Fibre              2-Feb-95       LET Univ. Voice Grade Chnl Unit                                4.00          4.00  
Advanced Fibre              2-Feb-95       RST Univ. Voice Grade Chnl Unit                                3.47          3.47  
Advanced Fibre              2-Feb-95       T1 Asynch chnl Unit (DSX)                                      9.18          9.18  
Advanced Fibre              2-Feb-95       Let Pots Channel Unit                                          3.13          3.13  
Advanced Fibre              2-Feb-95       RST Pots Channel Unit                                          3.63          3.63  
Advanced Fibre              2-Feb-95       Fiber Optic Transceiver                                       22.55         22.55  
Advanced Fibre              2-Feb-95       T1 Transceiver (DSX)                                           7.83          7.83  
Advanced Fibre              2-Feb-95       E1 Transceiver (G.703)                                         7.81          7.81  
Advanced Fibre              2-Feb-95       Transmission Only Channel Unit                                 7.04          7.04  
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                              10.71         10.71  
Ameritec                   15-May-95       C. O. Simulator, portable with Option AM7 DLC-96 Compt        74.15         74.15  
Ameritec                   15-May-95       DLC-96 Port Card                                             116.07        116.07  
Ameritec                   15-May-95       Am-7 Trunk Card                                               12.12         12.12  
Ameritec                   15-May-95       Dual Quad Tone Receiver Card                                  68.22         68.22  
Ameritec                   15-May-95       1.544 77 Port Card                                            22.76         22.76  
Ameritec                   15-May-95       Back Mount Kit                                                 0.77          0.77  

</TABLE>


ADVANCED ACCESS LABS                       FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
  12/18/96 11:24

<TABLE>
<CAPTION>

Beginning                                                                                             Q1 FY96        Net Book
Purchases               Date Rec'd         Description                                                 Depr           Value
                                                                                                                     thru 1996
- -------------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------------
<S>                     <C>                <C>                                                        <C>            <C>
NoiseCom                   18-Jul-94       Noise Source -Noise/Com NC6105 10 hz- 10mhz                  106.40          2,021.58 
Nohau                      26-Jul-94       Emul Board-Emul 51-PC/E32-16                                 133.06          2,528.20 
Nohau                      26-Jul-94       Bondoot Pod-C52-16                                            82.98          1,576.55 
Nohau                      26-Jul-94       Adv Trace Board-Emul 51-PC/ATRG-4-16                         124.88          2,372.75 
Nohau                      26-Jul-94       Stand. Trace Board-Emul 51-PC/TR16-16                         75.42          1,433.02 
Tritek                     26-Jul-94       Kron-Hite 3202 Turnable Filter                                75.45          1,433.48 
Test Equipment             28-Jul-94       HP 1645A-BER Test Set                                         72.04          1,368.79 
Hewlett Packard            29-Jul-94       HP 5385A RF Frequency Counter                                 88.60          1,683.42 
Hewlett Packard            29-Jul-94       HP 4378 Power Meter                                          105.43          2,003.20 
Hewlett Packard            29-Jul-94       HP 8483A Air Power Sensor                                     30.76            584.42 
Nohau                       4-Aug-94       Emul Board - Emul 16/300-PC/EIM 16.78                        247.37          4,700.12 
Nohau                       4-Aug-94       Pod - 16Z1/IM-16.78                                           94.79          1,800.98 
Nohau                       4-Aug-94       Trace Board - Eml 16/30OPC/DTR128-16.78                      330.00          6,270.07 
Nohau                       4-Aug-94       Adaptor - Emul 16/300PC/QFP132Clip                            73.93          1,404.68 
Nohau                       4-Aug-94       High Level Dbug SW-Emul 16/30OPC/HLD-CPU16                   123.91          2,354.22 
Nohau                       4-Aug-94       Pod - 161/2M-16.78                                           200.11          3,802.06 
Telogy                      5-Aug-94       HP 8647A Signal Generator                                    207.95          3,951.01 
Hewlett Packard             5-Aug-94       Amplifier & Preamplifier-HP8445F 50A                         113.36          2,153.90 
Stanford Research          12-Aug-94       Synthisized Function Generator-SRSDS345 30 Mhz               110.07          2,091.41 
Stanford Research          12-Aug-94       w/high stab time base                                          0.00              0.00 
Arrow Electronics          24-Aug-94       Bit Blaster-Part of PL-ASAP2 Programmers with                 19.15            363.88 
Arrow Electronics          24-Aug-94       PLPG Card for PLMPV - See June 94                              0.00              0.00 
Engineering Inventor       30-Sep-94       Per Rick Girvin-Will be transferred out at later date         39.66            753.50 
Hewlett Packard             7-Oct-94       E4746A EESOF Touchstone RF Simulator                         386.71          7,347.51 
Hewlett Packard             7-Oct-94       E5787A EESOF ESYN Filter Package                              38.50            731.44 
Ameritec                   11-Oct-94       Armeritec AM2-DE Bulk Call Generator                         965.33         18,341.22 
Ameritec                   11-Oct-94       Manual, Bantam 120 ohm inputs                                 12.77            242.59 
Advanced Fibre              2-Feb-95       Central Process Unit                                          73.89          1,699.58 
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                               21.58            496.26 
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                           35.65            824.57 
Advanced Fibre              2-Feb-95       Let Adv Intl Pots Chnl Unit                                   60.21          1,384.90 
Advanced Fibre              2-Feb-95       RST Adv Intl Pots Chnl Unit                                   58.32          1,341.33 
Advanced Fibre              2-Feb-95       T1 Transceiver (powered)                                      74.28          1,708.38 
Advanced Fibre              2-Feb-95       E1 Transceiver (powered)                                      73.91          1,699.87 
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                              62.39          1,434.93 
Advanced Fibre              2-Feb-95       Central Process Unit                                          60.07          1,381.62 
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                              10.96            252.13 
Advanced Fibre              2-Feb-95       Metallica Test Unit                                           13.81            317.54 
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                           12.14            279.29 
Advanced Fibre              2-Feb-95       LET Univ. Voice Grade Chnl Unit                               12.00            276.11 
Advanced Fibre              2-Feb-95       RST Univ. Voice Grade Chnl Unit                               10.40            239.25 
Advanced Fibre              2-Feb-95       T1 Asynch chnl Unit (DSX)                                     27.54            633.40 
Advanced Fibre              2-Feb-95       Let Pots Channel Unit                                          9.38            215.79 
Advanced Fibre              2-Feb-95       RST Pots Channel Unit                                         10.88            250.19 
Advanced Fibre              2-Feb-95       Fiber Optic Transceiver                                       67.65          1,555.95 
Advanced Fibre              2-Feb-95       T1 Transceiver (DSX)                                          23.49            540.32 
Advanced Fibre              2-Feb-95       E1 Transceiver (G.703)                                        23.44            539.10
Advanced Fibre              2-Feb-95       Transmission Only Channel Unit                                21.13            486.04 
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                              32.12            738.78 
Ameritec                   15-May-95       C. O. Simulator, portable with Option AM7 DLC-96 Compt       222.46          5,116.53 
Ameritec                   15-May-95       DLC-96 Port Card                                             348.21          8,008.93 
Ameritec                   15-May-95       Am-7 Trunk Card                                               36.37            836.49 
Ameritec                   15-May-95       Dual Quad Tone Receiver Card                                 204.67          4,707.47 
Ameritec                   15-May-95       1.544 77 Port Card                                            68.29          1,570.64 
Ameritec                   15-May-95       Back Mount Kit                                                 2.32             53.39 

</TABLE>


ADVANCED ACCESS LABS                       FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
  12/18/96 11:24

<TABLE>
<CAPTION>

Beginning                                                                                               Total Depr    AFC KEEPING
Purchases                 Date Rec'd       Description                                                   By Asset
                                                                                                        thru 1996
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>              <C>                                                          <C>           <C>
NoiseCom                   18-Jul-94       Noise Source -Noise/Com NC6105 10 hz- 10mhz                 728.42  
Nohau                      26-Jul-94       Emul Board-Emul 51-PC/E32-16                                910.97  
Nohau                      26-Jul-94       Bondoot Pod-C52-16                                          568.07  
Nohau                      26-Jul-94       Adv Trace Board-Emul 51-PC/ATRG-4-16                        854.96  
Nohau                      26-Jul-94       Stand. Trace Board-Emul 51-PC/TR16-16                       516.35  
Tritek                     26-Jul-94       Kron-Hite 3202 Turnable Filter                              516.52  
Test Equipment             28-Jul-94       HP 1645A-BER Test Set                                       493.21  
Hewlett Packard            29-Jul-94       HP 5385A RF Frequency Counter                               606.58  
Hewlett Packard            29-Jul-94       HP 4378 Power Meter                                         721.80     2,003.20
Hewlett Packard            29-Jul-94       HP 8483A Air Power Sensor                                   210.58       584.42
Nohau                       4-Aug-94       Emul Board - Emul 16/300-PC/EIM 16.78                     1,693.56  
Nohau                       4-Aug-94       Pod - 16Z1/IM-16.78                                         648.93  
Nohau                       4-Aug-94       Trace Board - Eml 16/30OPC/DTR128-16.78                   2,259.25  
Nohau                       4-Aug-94       Adaptor - Emul 16/300PC/QFP132Clip                          506.14  
Nohau                       4-Aug-94       High Level Dbug SW-Emul 16/30OPC/HLD-CPU16                  848.28  
Nohau                       4-Aug-94       Pod - 161/2M-16.78                                        1,369.97  
Telogy                      5-Aug-94       HP 8647A Signal Generator                                 1,423.64     3,951.01
Hewlett Packard             5-Aug-94       Amplifier & Preamplifier-HP8445F 50A                        776.10  
Stanford Research          12-Aug-94       Synthisized Function Generator-SRSDS345 30 Mhz              753.59  
Stanford Research          12-Aug-94       w/high stab time base                                         0.00  
Arrow Electronics          24-Aug-94       Bit Blaster-Part of PL-ASAP2 Programmers with               131.12  
Arrow Electronics          24-Aug-94       PLPG Card for PLMPV - See June 94                             0.00  
Engineering Inventor       30-Sep-94       Per Rick Girvin-Will be transferred out at later date       271.50       753.50
Hewlett Packard             7-Oct-94       E4746A EESOF Touchstone RF Simulator                      2,647.49     7,347.51
Hewlett Packard             7-Oct-94       E5787A EESOF ESYN Filter Package                            263.56       731.44
Ameritec                   11-Oct-94       Armeritec AM2-DE Bulk Call Generator                      6,608.78  
Ameritec                   11-Oct-94       Manual, Bantam 120 ohm inputs                                87.41  
Advanced Fibre              2-Feb-95       Central Process Unit                                        210.32  
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                              61.41  
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                         102.04  
Advanced Fibre              2-Feb-95       Let Adv Intl Pots Chnl Unit                                 171.38  
Advanced Fibre              2-Feb-95       RST Adv Intl Pots Chnl Unit                                 165.98  
Advanced Fibre              2-Feb-95       T1 Transceiver (powered)                                    211.41  
Advanced Fibre              2-Feb-95       E1 Transceiver (powered)                                    210.35  
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                            177.57  
Advanced Fibre              2-Feb-95       Central Process Unit                                        170.97  
Advanced Fibre              2-Feb-95       Local Exchange Power Supply Unit                             31.20
Advanced Fibre              2-Feb-95       Metallica Test Unit                                          39.29  
Advanced Fibre              2-Feb-95       Remote Subscriber Power Supply Unit                          34.56  
Advanced Fibre              2-Feb-95       LET Univ. Voice Grade Chnl Unit                              34.17  
Advanced Fibre              2-Feb-95       RST Univ. Voice Grade Chnl Unit                              29.61  
Advanced Fibre              2-Feb-95       T1 Asynch chnl Unit (DSX)                                    78.38  
Advanced Fibre              2-Feb-95       Let Pots Channel Unit                                        26.70
Advanced Fibre              2-Feb-95       RST Pots Channel Unit                                        30.96  
Advanced Fibre              2-Feb-95       Fiber Optic Transceiver                                     192.54  
Advanced Fibre              2-Feb-95       T1 Transceiver (DSX)                                         66.86  
Advanced Fibre              2-Feb-95       E1 Transceiver (G.703)                                       66.71  
Advanced Fibre              2-Feb-95       Transmission Only Channel Unit                               60.14  
Advanced Fibre              2-Feb-95       Channel Bank Assembly Test Shelf                             91.42  
Ameritec                   15-May-95       C. O. Simulator, portable with Option AM7 DLC-96 Compt      633.15  
Ameritec                   15-May-95       DLC-96 Port Card                                            991.07  
Ameritec                   15-May-95       Am-7 Trunk Card                                             103.51  
Ameritec                   15-May-95       Dual Quad Tone Receiver Card                                582.53  
Ameritec                   15-May-95       1.544 77 Port Card                                          194.36  
Ameritec                   15-May-95       Back Mount Kit                                                6.61  

</TABLE>

<PAGE>

<TABLE>
<CAPTION>

ADVANCED ACCESS LABS               FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
     12/18/96 11:24
- ------------------------------------------------------------------------------------------------------------------------------------

Beginning                                                                                          Jan-96        Feb-96      Mar-96
Purchases            Date Rec'd  Description                                          Total
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>         <C>                                               <C>         <C>        <C>       <C>
Ameritec              25-May-95  Analog Bulk Call Generator                        $25,008.48       322.53       322.53      322.53
Ameritec              25-May-95  Option, AM2 High Performance Package               $2,450.00        31.60        31.60       31.60
Ameritec              25-May-95  Rack Mount Kit                                        $60.00         0.77         0.77        0.77
Nohau Corp            14-Jul-95  Test Equip-EMUL16/300 PCE256-16 Kit(s/n 162837)    $2,295.00        29.60        29.60       29.60
Nohau Corp            14-Jul-95  POD-16Z1/1M-16 (s/n 162297)                        $2,295.00        29.60        29.60       29.60
Nohau Corp            14-Jul-95  EMUL16/300-PC/DTR128-16.78 Kit (s/n 232557)        $2,716.00        35.03        35.03       35.03
Nohau Corp            14-Jul-95  EMUL16/300PC/HLD-CPU16                             $1,500.00        19.35        19.35       19.35
Nohau Corp            14-Jul-95  EMUL16/300-PC/QRF132CLIP (s/n 950617)                $895.00        11.54        11.54       11.54
Elect. Eng Tools      21-Jul-95  Universal Programmer 32 pin PLCC to 32 Dip Adapter   $555.00         7.16         7.16        7.16
Toner Cable Equip     10-Aug-95  BTL61500090 SA7U 4121 Variable Attenuator            $103.23         1.33         1.33        1.33
Toner Cable Equip     10-Aug-95  VTK51500100 VSg-21 SYNC Generator                    $956.07        12.33        12.33       12.33
Toner Cable Equip     10-Aug-95  VTK51500110 DAT-1 Rackmount Frame                     $98.00         1.26         1.26        1.26
Toner Cable Equip     10-Aug-95  (2ea) BTL 11400120 AM-60-550 (59412) Modulator     $1,265.30        16.32        16.32       16.32
Toner Cable Equip     10-Aug-95  PBN99900120 2107A-0807TX Transmitter               $8,372.36       107.98       107.98      107.98
Toner Cable Equip     10-Aug-95  PBN99900030 9-ORH Housing                             $64.00         0.83         0.83        0.83
Toner Cable Equip     10-Aug-95  PBN99900130 7OR-750-/22-42/54 SC/UPC               $1,210.00        15.61        15.61       15.61
Toner Cable Equip     10-Aug-95  PBN99900140 7-ORT-WB1 SC/UPC                       $1,805.00        23.28        23.28       23.28
Toner Cable Equip     10-Aug-95  (4ea) PBN99905010 FC/APC Pigtail 5 meters            $507.33         6.54         6.54        6.54
Toner Cable Equip     10-Aug-95  (50ea) OEM62900010 GRB-1 Grounding Splice Block       $10.00         0.13         0.13        0.13
Toner Cable Equip     10-Aug-95  (10ea) OEM629000120 GRB-AR Sp Blk w/Lightn Arrestor   $32.26         0.42         0.42        0.42
Microtek Internation  29-Sep-95  FA,PP,68HC16Z1 Emulator, 1 Mhz, 128K Trace,OMB     $9,995.00       128.90       128.90      128.90
Microtek Internation  29-Sep-95  Overlay, Serial #507AA00545                            $0.00         0.00         0.00        0.00
Microtek Internation  29-Sep-95  PWA, Powerpack, Overlay RAM (1mg) Board            $2,995.00        38.63        38.63       38.63
Microtek Internation  29-Sep-95  Adapter, PP, To 132 PQFP Clipover                    $485.00         6.25         6.25        6.25
Toner Cable Equipm    27-Sep-95  RDRX Return Dual Receiver                          $1,764.25       126.02        22.75       22.75
Toner Cable Equipm    29-Sep-95  CT-2084VY Rec/Monitor                                $488.98        34.93         6.31        6.31
TTC                   30-Oct-95  Central Office Testing Package (T-Berd) w/ case   $14,667.21     1,047.66       189.16      189.16
Microtek Internation  26-Dec-95  Test Kit Option, PP, Kit68HC16Z1 Ser#503AB00114    $7,995.00       571.07       103.11      103.11
Arrow                 12-Dec-95  ALtera PLS Magnum Development System w/Bitblaster      $0.00         0.00         0.00        0.00
Arrow                 12-Dec-95  Serial cable; ASAPz standalone Programmer; VHDL        $0.00         0.00         0.00        0.00
Arrow                 12-Dec-95  Design entry option                                $7,285.00       520.36        93.95       93.95
AT & T Capital        15-Dec-95  Tek/K 465 Cart                                       $430.00        30.71         5.55        5.55
AT & T Capital        24-Jan-96  Tek/K 465 Cart                                      ($430.00)      (30.71)       (5.55)      (5.55)
AT & T Capital        24-Jan-96  Tek/K212 Cart-replaces Tek/K465 Cart                 $429.00        30.64         5.53        5.53
AT & T Capital        15-Dec-95  Tek/2465B Oscilloscope P07275                      $7,347.25       524.80        94.76       94.76
AT & T Capital        15-Dec-95  Tek/06201 Probe; Tek/1101A Probe Pwr Sup-P07280    $2,229.82       159.27        28.76       28.76
AT & T Capital        15-Dec-95  HP8647A Signal Generator PO7278                    $5,375.50       383.96        69.33       69.33
AT & T Capital        18-Dec-95  PHI/PM3585/90:A Logic Analyzer PO7277              $5,919.55       422.83        76.34       76.34
AT & T Capital        15-Dec-95  HP4263A LCR Meter                                  $5,375.50       383.96        69.33       69.33
AT & T Capital         5-Jan-96  HP16334A Test Fixture                                $602.43
Hewlett Packard       11-Nov-95  225 MHz RF Counter, Serial #341BA01002, Box 46785      $0.00         0.00         0.00       25.79
Hewlett Packard       11-Nov-95  US-English Localization, 1.5 GHz RF Input Channel  $2,150.00       153.57        27.73        1.93
Hewlett Packard       23-Jan-96  15MHz Functin/Arb Wavefore Generator                   $0.00
Hewlett Packard       23-Jan-96  Serial #US34015921, Box 69732                      $1,854.37
Hewlett Packard       24-Jan-96  (3)DC Power Supply Serial # KE51310819,Box 83787     $322.50
Hewlett Packard       24-Jan-96  S#KR41808094, Box83788; S #KR51303298,Box83789       $645.00
Hewlett Packard       24-Jan-96  (3)Triple output DC Power Supply                       $0.00
Hewlett Packard       24-Jan-96  Serial # KR51305190, Box 83790                       $526.75
Hewlett Packard       24-Jan-96  Serial # KR51305191, Box 83791                       $526.75
Hewlett Packard       24-Jan-96  Serial # KR51305336, Box 83792                       $526.75
Hewlett Packard       14-Mar-96  50 MHz Pulse/Function Generator,                       $0.00
Hewlett Packard       14-Mar-96  Serial # 3134G18083, Box 92835 PO7300              $4,516.50

                                 ACCOUNT 1530                                      286,964.54     7,150.16     3,578.14    3,578.14
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------

<CAPTION>

ADVANCED ACCESS LABS               FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
     12/18/96 11:24
- ------------------------------------------------------------------------------------------------------------------------------------

Beginning                                                                              Q1 FY96   Net Book    Total Depr       AFC
Purchases            Date Rec'd  Description                                            Depr       Value      By Asset      KEEPING
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                 thru 1996    thru 1996
Ameritec              25-May-95  Analog Bulk Call Generator                            967.59    22,254.57     2,753.91
Ameritec              25-May-95  Option, AM2 High Performance Package                   94.79     2,180.21       269.79
Ameritec              25-May-95  Rack Mount Kit                                          2.32        53.39         6.61
Nohau Corp            14-Jul-95  Test Equip-EMUL16/300 PCE256-16 Kit(s/n 162837)        88.79     2,042.28       252.72
Nohau Corp            14-Jul-95  POD-16Z1/1M-16 (s/n 162297)                            88.79     2,042.28       252.72
Nohau Corp            14-Jul-95  EMUL16/300-PC/DTR128-16.78 Kit (s/n 232557)           105.08     2,416.92       299.08
Nohau Corp            14-Jul-95  EMUL16/300PC/HLD-CPU16                                 58.04     1,334.82       165.18
Nohau Corp            14-Jul-95  EMUL16/300-PC/QRF132CLIP (s/n 950617)                  34.63       796.44        98.56
Elect. Eng Tools      21-Jul-95  Universal Programmer 32 pin PLCC to 32 Dip Adapter     21.47       493.88        61.12
Toner Cable Equip     10-Aug-95  BTL61500090 SA7U 4121 Variable Attenuator               3.99        91.86        11.37
Toner Cable Equip     10-Aug-95  VTK51500100 VSg-21 SYNC Generator                      36.99       850.79       105.28
Toner Cable Equip     10-Aug-95  VTK51500110 DAT-1 Rackmount Frame                       3.79        87.21        10.79
Toner Cable Equip     10-Aug-95  (2ea) BTL 11400120 AM-60-550 (59412) Modulator         48.96     1,125.97       139.33
Toner Cable Equip     10-Aug-95  PBN99900120 2107A-0807TX Transmitter                  323.93     7,450.40       921.96
Toner Cable Equip     10-Aug-95  PBN99900030 9-ORH Housing                               2.48        56.95         7.05
Toner Cable Equip     10-Aug-95  PBN99900130 7OR-750-/22-42/54 SC/UPC                   46.82     1,076.76       133.24
Toner Cable Equip     10-Aug-95  PBN99900140 7-ORT-WB1 SC/UPC                           69.84     1,606.24       198.76
Toner Cable Equip     10-Aug-95  (4ea) PBN99905010 FC/APC Pigtail 5 meters              19.63       451.46        55.87
Toner Cable Equip     10-Aug-95  (50ea) OEM62900010 GRB-1 Grounding Splice Block         0.39         8.90         1.10
Toner Cable Equip     10-Aug-95  (10ea) OEM629000120 GRB-AR Sp Blk w/Lightn Arrestor     1.25        28.71         3.55
Microtek Internation  29-Sep-95  FA,PP,68HC16Z1 Emulator, 1 Mhz, 128K Trace,OMB        386.71     8,894.36     1,100.64
Microtek Internation  29-Sep-95  Overlay, Serial #507AA00545                             0.00         0.00         0.00
Microtek Internation  29-Sep-95  PWA, Powerpack, Overlay RAM (1mg) Board               115.88     2,665.20       329.81
Microtek Internation  29-Sep-95  Adapter, PP, To 132 PQFP Clipover                      18.76       431.59        53.41
Toner Cable Equip     27-Sep-95  RDRX Return Dual Receiver                             171.52     1,592.73       171.52
Toner Cable Equip     29-Sep-95  CT-2084VY Rec/Monitor                                  47.54       441.43        47.54
TTC                   30-Oct-95  Central Office Testing Package (T-Berd) w/ case     1,425.98    13,241.23     1,425.98
Microtek Internation  26-Dec-95  Test Kit Option, PP, Kit68HC16Z1 Ser#503AB00114       777.29     7,217.71       777.29
Arrow                 12-Dec-95  ALtera PLS Magnum Development System w/Bitblaster       0.00         0.00         0.00        0.00
Arrow                 12-Dec-95  Serial cable; ASAPz standalone Programmer; VHDL         0.00         0.00         0.00        0.00
Arrow                 12-Dec-95  Design entry option                                   708.26     6,576.74       708.26    6,576.74
AT & T Capital        15-Dec-95  Tek/K 465 Cart                                         41.81       388.19        41.81      388.19
AT & T Capital        24-Jan-96  Tek/K 465 Cart                                        (41.81)     (388.19)      (41.81)    (388.19)
AT & T Capital        24-Jan-96  Tek/K212 Cart-replaces Tek/K465 Cart                   41.71       387.29        41.71      387.29
AT & T Capital        15-Dec-95  Tek/2465B Oscilloscope P07275                         714.32     6,632.93       714.32    6,632.93
AT & T Capital        15-Dec-95  Tek/06201 Probe; Tek/1101A Probe Pwr Sup-P07280       216.79     2,013.03       216.79    2,013.03
AT & T Capital        15-Dec-95  HP8647A Signal Generator PO7278                       522.62     4,852.88       522.62    4,852.88
AT & T Capital        18-Dec-95  PHI/PM3585/90:A Logic Analyzer PO7277                 575.51     5,344.04       575.51    5,344.04
AT & T Capital        15-Dec-95  HP4263A LCR Meter                                     522.62     4,852.88       522.62    4,852.88
AT & T Capital         5-Jan-96  HP16334A Test Fixture                                              602.43         0.00      602.43
Hewlett Packard       11-Nov-95  225 MHz RF Counter, Serial #341BA01002, Box 46785      25.79       (25.79)       25.79      (25.79)
Hewlett Packard       11-Nov-95  US-English Localization, 1.5 GHz RF Input Channel     183.23     1,966.77       183.23    1,966.77
Hewlett Packard       23-Jan-96  15MHz Functin/Arb Wavefore Generator                                 0.00         0.00        0.00
Hewlett Packard       23-Jan-96  Serial #US34015921, Box 69732                                    1,854.37         0.00    1,854.37
Hewlett Packard       24-Jan-96  (3)DC Power Supply Serial # KE51310819,Box 83787                   322.50         0.00      322.50
Hewlett Packard       24-Jan-96  S#KR41808094, Box83788; S #KR51303298,Box83789                     645.00         0.00      645.00
Hewlett Packard       24-Jan-96  (3)Triple output DC Power Supply                                     0.00         0.00        0.00
Hewlett Packard       24-Jan-96  Serial # KR51305190, Box 83790                                     526.75         0.00      526.75
Hewlett Packard       24-Jan-96  Serial # KR51305191, Box 83791                                     526.75         0.00      526.75
Hewlett Packard       24-Jan-96  Serial # KR51305336, Box 83792                                     526.75         0.00      526.75
Hewlett Packard       14-Mar-96  50 MHz Pulse/Function Generator,                                     0.00         0.00        0.00
Hewlett Packard       11-Nov-95  Serial # 3134G18083, Box 92835 PO7300                            4,516.50         0.00    4,516.50
                                                                                                                        ------------
                                                                                                                        ------------

                                 ACCOUNT 1530                                       14,306.44   240,581.54    46,383.00   57,492.91
- ------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

<TABLE>
<CAPTION>

ADVANCED ACCESS LABS               FIXED ASSETS
ENGINEERING, COMPUTER EQUIPMENT & CUBICLE FURNITURE
     12/18/96 11:24

Beginning                                                                                         Jan-96        Feb-96      Mar-96
Purchases            Date Rec'd  Description                                         Total
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>        <C>                                               <C>            <C>          <C>       <C>
MTL                   11-Nov-95  Misc computer/telephone setup                     $24,088.50     1,720.61       310.67      310.67


                                 ACCOUNT 1550                                       24,088.50     1,720.61       310.67      310.67
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------

                                                                                                 Jan-96       Feb-96      Mar-96

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

                                 TOTAL ACQUIRED ASSETS THRU MARCH 96               583,845.98    12,503.31     6,472.47    6,465.74
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                              G/L  583,845.98
                                                                       Difference       (0.00)

<CAPTION>

Beginning                                                                           Q1 FY96      Net Book     Total Depr      AFC
Purchases            Date Rec'd  Description                                         Depr          Value       By Asset     KEEPING
- -----------------------------------------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------------------------------------
                                                                                                 thru 1996    thru 1996
MTL                   11-Nov-95  Misc computer/telephone setup                       2,341.94    21,746.56     2,341.94    21,746.56


                                 ACCOUNT 1550                                        2,341.94    21,746.56     2,341.94
- -------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------

                                                                                   Total Depr    Net Book       Total
                                                                                       Q1          Value        Depr
- -------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------

                                 TOTAL ACQUIRED ASSETS THRU MARCH 96                25,441.53   497,582.03    86,263.95   130,251.36
- -------------------------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

                                  ATTACHMENT B

                     J.V. COMPANY ASSETS RETAINED BY TELLABS


Cash in Bank                            $647,038.50 as of November 28, 1996 plus
                                        any amounts of interest accrued
                                        thereafter.

Property, Plant and Equipment           $367,330.67


- --------------------------------------------------------------------------------
                                                                   PAGE 11 OF 11


<PAGE>


                                                                 Exhibit 10.31



                         LICENSE AND MARKETING AGREEMENT
                                     BETWEEN
                       ADVANCED FIBRE COMMUNICATIONS, INC.
                                       AND
                            TELLABS OPERATIONS, INC.



This License and Marketing Agreement ("Agreement") is entered into effective as
of December 23, 1996 ("Effective Date") between Advanced Fibre Communications,
Inc., a Delaware corporation located at 1445 McDowell Boulevard North, Petaluma,
CA 94975 ("AFC"), and Tellabs Operations, Inc., a Delaware corporation located
at 4951 Indiana Avenue, Lisle, IL 60532 ("Tellabs").


                                    RECITALS


WHEREAS, AFC manufactures and sells or licenses certain telecommunications
hardware and software products;

WHEREAS, Tellabs is in the business of manufacturing, marketing and distributing
telecommunications products throughout the world;

WHEREAS, Tellabs and AFC were parties to a Joint Venture and Partnership
Agreement dated April 11, 1994 ("J.V. Agreement");

WHEREAS, Tellabs and AFC entered into a Memorandum of Understanding dated April
3, 1996 ("MOU") pursuant to which they agreed to terminate the J.V. Agreement;

WHEREAS, Tellabs and AFC have terminated the J.V. Agreement by entering into a
Termination Agreement contemporaneously herewith ("Termination Agreement");

WHEREAS, AFC wishes to grant to Tellabs, as provided herein, a development
license to modify certain of AFC's technology on a restricted basis for sale of
products by Tellabs, and further, upon completion of such modifications, Tellabs
desires to grant AFC the option to purchase such products from Tellabs on the
terms and conditions set forth in this Agreement and in a separate OEM Agreement
to be entered into contemporaneously herewith ("OEM Agreement");


- -------------------------------------------------------------------------------
12/23/96                                                           Page 1 of 42

<PAGE>


WHEREAS, AFC may make certain developments to its UMC 1000 Products (as defined
below) and desires to grant to Tellabs, as provided herein, an option to fund
additional developments or to accelerate AFC planned developments on the terms
and conditions set forth in this Agreement as well as the option to purchase the
UMC 1000 Products from AFC on the terms and conditions set forth in this
Agreement and in the OEM Agreement;

WHEREAS, the parties wish to grant certain manufacturing rights to one another
for certain of their respective products; and

WHEREAS, AFC and Tellabs wish to provide for certain marketing and sales
activities on the terms and conditions set forth in this Agreement.


NOW, THEREFORE, in consideration of the mutual promises contained herein, the
parties agree as follows:


1.   DEFINITIONS


     1.1  CROSS REFERENCE TABLE
          The following terms defined elsewhere in this Agreement in the
          sections set forth below, shall have the respective meanings therein
          defined:


                                             Section
                                             -------
          "Annual Revenue"                   7.3.2
          "CAPs"                             7.1.1
          "Competitive DLC Product"          5.5.1
          "Competitive HFC Product"          5.5.2
          "Current Bus"                      3.1.1
          "Development License Breach"       2.8
          "Domestic Alternate Provider"      7.1.1
          "Entities"                         7.3
          "Foreign Alternate Provider"       7.2.1
          "Holding Company"                  7.3.1
          "J.V. Agreement"                   Preamble
          "MOU"                              Preamble
          "MSO"                              7.1.1.1
          "OEM Agreement"                    Preamble
          "Specifications"                   3.2.2
          "Statement of Work"                3.2.1
          "Tellabs Funded Development"       3.2


- -------------------------------------------------------------------------------
12/23/96                                                           Page 2 of 42

<PAGE>


          "Terminated Party"                 13.3
          "Terminating Party"                13.3
          "Termination Agreement"            Preamble
          "Unauthorized Development"         2.8


1.2       "AFC COMPETITOR" shall mean a company engaged in the business of
          development and marketing of a Competitive DLC Product.

1.3       "AFFILIATE" shall mean an individual or entity that directly or
          indirectly controls, is controlled by, or is under common control
          with, the entity specified.  For purposes of this definition,
          "control" shall mean beneficial ownership of more than 50% of the
          voting stock of such entity.

1.4       "CPU SYSTEM SOFTWARE" means any software, including firmware,
          developed by or for AFC, which is imbedded or incorporated in or used
          in connection with the CPU for the UMC 1000 Products.

1.5       "DISTRIBUTOR" shall mean any person or entity who has been granted the
          right to distribute or re-sell any products of AFC or its Affiliate(s)
          and/or Tellabs or its Affiliate(s), either directly by such party or
          indirectly under authority granted by such party, subject to the
          restrictions set forth in Section 7.4 hereof.


1.6       "EMS INTERFACE" means the Software for an SNMP and/or Q3 MIB that is
          loaded on the DLP module which is part of the UMC 1000 Product.

1.7       "END USER" shall mean any person or entity who has been granted the
          right to use, but not to distribute or re-sell, any products sold by
          AFC and/or Tellabs, either directly by such party or indirectly under
          authority granted by such party.

1.8       "ENHANCEMENTS" shall mean revisions to a product (Hardware and/or
          Software) which materially alter and/or add to its architecture or
          fundamental functionality.

1.9       "DESIGN PACKAGE" shall mean the set of documentation for the design of
          the applicable product, and shall include, but shall not be limited
          to, engineering design specifications, engineering test
          specifications, costed bill of materials, parts list, board lay-outs
          and schematics.  The Design Package shall include, at a minimum, the
          same level and types of documentation developed by AFC for the UMC
          1000 Products.


- -------------------------------------------------------------------------------
12/23/96                                                           Page 3 of 42

<PAGE>

1.10      "HARDWARE" shall mean equipment, modules, assemblies and subassemblies
          but does not include Software.

1.11      "IMPROVEMENTS" shall mean fixes, corrections or work-arounds to errors
          in a product as well as any other improvements in system performance,
          modifications or revisions which do not materially alter the original
          functional characteristics of such product.

1.12      "JOINT TECHNOLOGY" means the technology relating to the upconverter,
          direct down converter, LUU-VIC burst receiver and QPSK clock recovery
          circuits for the product developed under the J.V. Agreement and now
          owned equally by Tellabs and AFC, as provided in the Termination
          Agreement, as well as any Improvements or Enhancements to the LUU-VIC
          burst receiver which are or have been contributed to by Victor Ivashin
          after the Effective Date.

1.13      "J.V. Product" means the products developed pursuant to the terms of
          the J.V. Agreement, whether developed by the J.V. Company, AFC or
          Tellabs or jointly, including any Enhancements and Improvements
          thereto.

1.14      "J.V. PRODUCT TECHNOLOGY" means the technology embodied in the J.V.
          Product including, without limitation, design documentation, board
          schematics, software, firmware, object and source code, designs,
          technology, ideas, know-how, processes, formulas, data, techniques,
          improvements, modifications, inventions (whether patentable or not),
          works of authorship, derivative works, circuits, mask works, layouts,
          algorithms, and computer programs relating thereto, and all patents,
          patent rights, copyrights, mask work rights, trade secret rights and
          other intellectual property and proprietary rights therein anywhere in
          the world.

1.15      "MANUFACTURING DOCUMENTATION" shall mean the set of documentation for
          the manufacture of the applicable product, which shall include those
          documents referred to in Attachment A hereto, if available, but which
          shall, in any event, be at least as detailed as the information
          provided to the providing party's other manufacturing organizations,
          both internal and external.

1.16      "NET REVENUE" shall mean a party's actual revenue received from the
          distribution of the applicable product(s) hereunder (not including
          taxes, freight, shipping, transport, handling, packaging, insurance,
          export fees, duties, commissions and similar charges), less deductions
          for returns.


- -------------------------------------------------------------------------------
12/23/96                                                           Page 4 of 42

<PAGE>

1.17      "RF ACCESS PRODUCTS" means (a) the Hardware, Software and mechanical
          aspects of a family of stand-alone coax RF access products; and (b)
          the Software additions and modifications to the CPU System Software
          solely for the purpose of supporting such RF Access Products (namely,
          CUI provisioning screens, building a CPU load for Tellabs' name, logo,
          and part numbers and database entries to support new RF card types),
          where the maximum drop bandwidth is twelve (12) DSOs of capacity for
          voice services (but no maximum drop bandwidth limitations for data).

1.18      "RF TRANSCEIVERS" means (a) the RF modem hardware (clock, data and
          control) needed to interconnect into the AFC owned and controlled
          backplane ASICs (e.g., WBGA) and the micro complex; (b) the software
          or firmware loaded onto RF Transceiver boards; and (c) the software
          additions to the CPU System Software solely for the purpose of
          supporting the RF Transceivers (namely, CUI provisioning screens,
          building a CPU load for Tellabs' name, logo, and part numbers and
          database entries to support new RF card types).

1.19      "SOFTWARE" shall mean computer programs, procedures, rules and
          associated documentation designed to make use of and extend the
          capabilities of Hardware.  Software includes, but is not limited to
          source codes, object codes for control programs, operating system
          programs, general application programs, special application programs,
          programming aids, routines, subroutine translations, compilers,
          diagnostics, firmware, proprietary VLSI devices, databases,
          documentation to maintain, describe and use any of the foregoing, and
          other related programs.

1.20      "TELLABS" shall mean Tellabs Operations, Inc. and its Affiliates.

1.21      "TELLABS COMPETITOR" shall mean a company engaged in the business of
          development and marketing of a Competitive HFC Product.

1.22      "TELLABS DEVELOPMENTS" means, collectively, the (i) J.V. Product; and
          (ii) the EMS Interface, the RF Access Products and the RF Transceivers
          and any Enhancements and Improvements to the EMS Interface, the RF
          Access Products and RF Transceivers, developed by Tellabs after the
          Effective Date.

1.23      "TELLABS TECHNOLOGY" means the technology embodied in the Tellabs
          Developments and any other products and technology developed by
          Tellabs (and any Enhancements and Improvements to any of the foregoing
          developed by Tellabs after the Effective Date) including,


- -------------------------------------------------------------------------------
12/23/96                                                           Page 5 of 42

<PAGE>

     without limitation, design documentation, board schematics, software,
     firmware, object and source code, designs, technology, ideas, know-how,
     processes, formulas, data, techniques, improvements, modifications,
     inventions (whether patentable or not), works of authorship, derivative
     works, circuits, mask works, layouts, algorithms, and computer programs
     relating thereto, and all patents, patent rights, copyrights, mask work
     rights, trade secret rights and other intellectual property and proprietary
     rights therein anywhere in the world.  "Tellabs Technology" specifically
     excludes the UMC 1000 Licensed Technology and any modifications and
     additions made by Tellabs to the CPU System Software, which shall be owned
     by AFC.

     1.24    "UMC 1000 LICENSED TECHNOLOGY" means technology developed by or
             for, or licensed to AFC for the CPU, DLP, shelves and backplane of
             the UMC 1000 Products existing as of the Effective Date of this
             Agreement (and any Enhancements and Improvements to the foregoing
             developed by AFC after the Effective Date which are licensed to
             Tellabs pursuant to Section 3.1 below), including, without
             limitation, design documentation, board schematics, software,
             firmware, object and source code, designs, technology, ideas, know-
             how, processes, formulas, data, techniques, improvements,
             modifications, inventions, (whether patentable or not), works of
             authorship, derivative works, circuits, mask works, layouts,
             algorithms, and computer programs relating thereto, and all
             patents, patent rights, copyrights, mask work rights, trade secret
             rights and other intellectual property and proprietary rights
             therein anywhere in the world.

     1.25    "UMC 1000 PRODUCTS" mean those products currently constituted of
             the AFC UMC 1000 product line as it exists as of the Effective Date
             plus all Enhancements and Improvements thereto developed by or for
             AFC during the term of this Agreement, whether or not carrying the
             "UMC 1000" name, which are licensed to or otherwise made available
             to Tellabs pursuant to the terms of this Agreement.

     1.26    "UMC 1000 TECHNOLOGY" means the technology embodied in the UMC 1000
             Products, including, without limitation, design documentation,
             board schematics, software, firmware, object and source code,
             designs, technology, ideas, know-how, processes, formulas, data,
             techniques, improvements, modifications, inventions, (whether
             patentable or not), works of authorship, derivative works,
             circuits, mask works, layouts, algorithms, and computer programs
             relating thereto, and all patents, patent rights, copyrights, mask
             work rights, trade secret rights and other

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                                                                    PAGE 6 OF 42

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intellectual property and proprietary rights therein anywhere in the world.


2.   DEVELOPMENT LICENSE FOR UMC 1000 LICENSED TECHNOLOGY
     2.1     Subject to the terms and conditions of this Agreement, AFC hereby
             grants Tellabs a limited, nontransferable, nonsublicensable,
             nonexclusive, perpetual, irrevocable, worldwide license and right
             to use the UMC 1000 Licensed Technology subject to the restrictions
             herein and only for the purpose of developing, having developed,
             manufacturing, having manufactured, maintaining, enhancing and
             modifying and distributing:

             2.1.1  Coax RF Transceivers which plug into any current or future
                    AFC shelf/assemblies;

             2.1.2  An EMS Interface based upon SNMP and/or Q3 for network
                    management provided, however, that AFC shall be obligated to
                    make the Hardware modifications to the DLP and CPU System
                    Software changes to support Tellabs' requirements for the
                    EMS Interface;

             2.1.3  RF Access Products that communicate with the RF Transceivers
                    referenced in Section 2.1.1 above.  Such RF Access Products
                    will have a coax RF modem as the transceiver interface to
                    the UMC 1000 Products.  The data interfaces on the RF Access
                    Products cannot be used as a transceiver to any additional
                    digital loop carrier equipment or any equipment used by the
                    service provider to derive voice services; and

             2.1.4  Any mechanical products or designs outside of the UMC 1000
                    Product plug-in cards, shelf and/or backplane.

     2.2     Tellabs shall have sole responsibility for funding the developments
             listed in Section 2.1 and such developments will be deemed Tellabs
             Technology hereunder, with the exception of any UMC 1000 Licensed
             Technology incorporated or contained therein.

     2.3     The license described in this Section 2 does not give Tellabs the
             right to develop or have developed a copper, fiber or wireless
             transceiver interface that communicates with the UMC 1000 
             Products. Such products are considered part of the UMC 1000 
             Products and will be developed and owned by AFC.  Notwithstanding
             the foregoing, nothing contained herein shall prohibit Tellabs 
             from using standard network interfaces to connect

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                                                                    PAGE 7 OF 42

<PAGE>
             with the UMC 1000 Products.  Standard network interfaces do not
             include any proprietary communication protocols.

     2.4     AFC will maintain software locks between the UMC 1000 Products and
             the Tellabs versions for such products.  Tellabs will provide AFC
             with all information reasonably required by AFC to maintain such
             locks.

     2.5     Tellabs will have no rights to sell, transfer, license or assign
             the UMC 1000 Licensed Technology to any third party.

     2.6     AFC shall control the CPU System Software.  The license rights
             granted pursuant to Sections 2.1.1 and 2.1.3 shall include the
             right to make necessary changes to the CPU System Software.  Except
             as expressly permitted in this Agreement, Tellabs shall not be
             allowed to modify the CPU System Software to alter or to modify the
             basic UMC 1000 Product functionality, including, but not limited
             to, call control, database structures, and interprocessor
             communication.  Any changes desired in these areas, will be made
             only by AFC, as reasonably requested by Tellabs, at charges
             calculated using the formula in Section 3.2.4.  The changes made
             pursuant to this Section 2.6 will be deemed a Tellabs Funded
             Development under Section 3, provided however, that the payments
             made by Tellabs will not be treated as advances on royalties under
             Section 3.4.

     2.7     AFC shall have the right, by written notice, to terminate
             immediately the development license granted to Tellabs in Section
             2.1 under the circumstances set forth in Section 2.8 below.  If the
             Section 2.1 license is terminated pursuant to this section, Tellabs
             shall be required to turn over to AFC any designs which violate the
             restrictions and remove any product containing such designs from
             any customer locations.  AFC shall not be entitled to use any such
             designs but will retain all rights to the underlying UMC 1000
             Licensed Technology.

     2.8     Tellabs will be deemed to have committed a "Development License
             Breach" if; (i) Tellabs violates the development license in Section
             2.1 by developing a product, a feature or a fix outside the scope
             of the license granted pursuant to Section 2.1 ("Unauthorized
             Development"), and (ii) such Unauthorized Development is actually
             incorporated in a product which is sold by Tellabs to a Customer.

             If Tellabs commits a single Development License Breach during the
             course of any consecutive twelve-month period, Tellabs shall be
             entitled to cure such breach by: (i) removing the Unauthorized
             Development from any

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                                                                    PAGE 8 OF 42

<PAGE>

             customer locations; and (ii) restoring the product design to its
             original condition, prior to the Unauthorized Development.  If
             Tellabs either: (i) fails to cure the Development License Breach;
             or (ii) commits a second Development License Breach during any
             consecutive twelve-month period, AFC shall be entitled to exercise
             the rights as set forth in Section 2.7 above.  The remedy set forth
             in Sections 2.7 and 2.8 shall be AFC's sole remedies for Tellabs'
             breach of the development license provided, however, that is after
             termination of the development license, Tellabs thereafter commits
             another Development License Breach, AFC shall be entitled to
             exercise the rights set forth in Sections 13 and 14 of this
             Agreement.


3.   UMC 1000 FUTURE DEVELOPMENTS

     3.1     Tellabs shall be entitled to have access to Enhancements and
             Improvements to the UMC 1000 Products developed by AFC after the
             Effective Date (whether or not a Tellabs Funded Development), as
             provided in this Section 3.1.

             3.1.1  The development license granted pursuant to Section 2 shall
                    extend to all Improvements and Enhancements to the UMC 1000
                    Licensed Technology relating to developments which are
                    designed to fit into the 98 megabit backplane bus for the
                    UMC 1000 Products as it exists on the Effective Date
                    ("Current Bus").  AFC shall deliver the Design Package
                    within ten (10) days of commencement of beta trial for each
                    such Improvement or Enhancement.

             3.1.2  The manufacturing rights granted pursuant to Section 5 shall
                    extend to all Enhancements and Improvements to the UMC 1000
                    Products which fit into the Current Bus.

             3.1.3  The Enhancements and Improvements referred to in Sections
                    3.1.1 and 3.1.2, as well as any other Enhancement or
                    Improvement which operates with both the Current Bus and a
                    new backplane bus, including but no limited to the new high-
                    speed bus for the next version of the UMC 1000 Products,
                    will be made available to Tellabs on an OEM basis under the
                    terms and conditions set forth in the OEM Agreement and in
                    Section 5 of this Agreement.  AFC agrees that the design for
                    the new high-speed bus backplane will allow the Tellabs
                    Developments for the Current Bus to plug into and operate
                    with Current Bus on the new backplane.

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                                                                    PAGE 9 OF 42

<PAGE>

             3.1.4  AFC agrees to grant Tellabs manufacturing rights for any
                    Enhancement or Improvement to the UMC 1000 Products which
                    operate with both the Current Bus and a new backplane bus,
                    on commercially reasonable terms and conditions to be agreed
                    upon by the parties.

     3.2     Tellabs has an option to fund additional Enhancements and
             Improvements to the UMC 1000 Products (including but not limited to
             the UMC 1000 Licensed Technology), or to accelerate, to the extent
             reasonable and feasible, AFC-planned Enhancements and Improvements
             to the UMC 1000 Products as Tellabs deems necessary for its markets
             (collectively "Tellabs Funded Developments").  Any additional
             Enhancements or Improvements to the UMC 1000 Licensed Technology
             developed by AFC pursuant to this Section 3.2 shall be made
             available to Tellabs under the license and subject to the
             restrictions in Section 2 above.  The following provisions will
             apply to any Tellabs Funded Developments:

             3.2.1  PREPARATION OF STATEMENT OF WORK.  The parties shall jointly
                    prepare a mutually agreed upon written statement of work
                    ("Statement of Work") setting forth the development
                    activities and obligations of AFC with respect to
                    specifications for the Tellabs Funded Development and a
                    milestone schedule and estimated resource allocations for
                    the completion of such activities and obligations.  The
                    parties understand and agree that the Statement of Work may
                    be modified, from time to time, but only if such
                    modification is in writing and signed by both parties.

             3.2.2  SPECIFICATIONS.  All work and performance under the
                    Statement of Work shall be pursuant to one or more
                    specifications setting forth the functional description for
                    the Tellabs Funded Development ("Specification(s)")
                    developed by the parties, each of which shall be in writing
                    and become effective only when signed by both parties. 
                    Changes in any Specification shall be effective only when a
                    written change request is signed by both parties.

             3.2.3  DEVELOPMENT OBLIGATIONS.  AFC will develop the Tellabs
                    Funded Developments in accordance with the Statement of Work
                    and Specifications.  Unless otherwise agreed to by Tellabs,
                    AFC will not be allowed to reassign resources designated by
                    the Statement of Work to other developments until AFC has
                    completed its development of the Tellabs Funded Development.
                    Reassignment of such specifically committed resources by AFC
                    will be considered a breach of this Section 3.2.3 and will
                    allow Tellabs to manage the

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                                                                   PAGE 10 OF 42

<PAGE>

             development resources at AFC assigned to the applicable 
             Statement(s) of Work as provided in Section 3.5.

     3.2.4   FUNDING. Funding level estimates for these Tellabs Funded 
             Developments will be determined per project based on a set 
             criteria mutually agreed to by the two companies. Tellabs may 
             fully participate in the progress of these developments which 
             includes but is not limited to inspecting development schedules, 
             attending formal design review(s), receiving copies of design 
             specifications and test results, and the right to participate in 
             the formulation of plans to keep projects on track. Tellabs will 
             provide the cash funding for these developments based upon the 
             actual salaries of the developers, plus 24.2% for benefits of 
             the recorded staff hours for the Tellabs Funded Developments 
             (provided that no benefit amount shall be charged if 
             consultants or outside contracted engineering are used to the 
             extent AFC is not responsible for benefit amounts). In addition, 
             Tellabs also will provide cash funding for facilities and 
             equipment allocations for any developers over an FTE (full-time 
             equivalent) of five (5). This amount will be paid on a monthly 
             basis within thirty (30) days after receipt of a valid invoice. 
             To receive payment, AFC must submit a formal invoice no later 
             than thirty (30) days after the end of the billing period, 
             including name, hours worked, actual salary rate and benefit 
             amount, if applicable. Tellabs will have no obligation to pay 
             invoices which are late (by more than sixty (60) days beyond 
             the thirty (30) day period in the prior sentence) or which do 
             not contain the information required by the previous sentence.

     3.2.5   OWNERSHIP. AFC will own any and all CPU System Software 
             modifications and pre-existing UMC 1000 Technology which is 
             contained in a Tellabs Funded Development. Tellabs and AFC will 
             jointly own (and have equal rights to) all other technology 
             relating to a Tellabs Funded Development, including but not 
             limited to new Software code resident on a plug-in card that 
             controls the new circuit designs provided that Tellabs has 
             provided one hundred percent (100%) of the funding, otherwise 
             AFC will own such technology. Prior to commencing development, 
             the parties will jointly agree upon the level of ownership and 
             the funding allocation for each portion of the development, 
             subject to the foregoing terms. Tellabs agrees not to sell, 
             transfer or assign the jointly-owned technology to an AFC 
             Competitor. AFC agrees that the jointly owned technology will be 
             subject to all rights and restrictions relating to other UMC 
             1000 Technology.


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<PAGE>

     3.3     AFC agrees to use its best efforts to complete developments in a 
             timely fashion and to keep Tellabs fully informed as to the 
             status of all UMC 1000 Product developments. AFC agrees to 
             distribute to Tellabs on a regular basis no less frequently than 
             monthly, a copy of the UMC Product roll-out plans, product 
             definitions, and development schedules for all planned 
             Enhancements and Improvements to the UMC 1000 Product.

     3.4     If Tellabs funds a Tellabs Funded Development, such funds will 
             be considered a non-refundable advance against any royalties 
             Tellabs will be obligated to pay AFC for sales of each 
             particular development, which will be recouped against any such 
             royalties that accrue for such development until such time as 
             that project's development cost has been completely recouped 
             except for Tellabs Funded Developments under Section 2.6. At 
             such time as the development funds have been recouped, Tellabs 
             shall resume normal royalty payments on that particular 
             development. In the case of Tellabs Funded Developments 
             involving CPU System Software developments, a percent of the 
             overall system selling price will be used to determine the sales 
             value of the waived royalty amount.

     3.5     If AFC (i) refuses to undertake development of a Tellabs Funded 
             Development, or (ii) fails to undertake any of its development 
             obligations under Section 2.1.2 and/or 2.6 hereof, AFC will be 
             considered in breach of its development commitment to Tellabs 
             and subject to a $100,000 penalty payable to Tellabs for each 
             such failure. Tellabs cannot accelerate an AFC-planned feature 
             that is within three (3) months of the date requested by 
             Tellabs. In addition, if AFC begins a Tellabs Funded 
             Development, or any development under Section 2.1.2 or 2.6, and 
             if that development is more than three (3) months late based 
             upon the key milestones as originally outlined in the plan for 
             the project mutually agreed to by both companies (or as amended 
             by mutual agreement), or, under the circumstances referred to in 
             Section 3.2.3, then Tellabs at its option can elect to take over 
             the management of this specific development project and the 
             resources which had been agreed upon as assigned to perform that 
             development at AFC's location. Unless otherwise agreed, Tellabs 
             shall not have the right to assign additional AFC resources to 
             this specific development; Tellabs' only right shall be to 
             manage AFC development resources assigned to the project and, if 
             necessary, to add Tellabs' resources provided that those 
             resources must perform their work in Petaluma, CA.


4.   OWNERSHIP
     4.1     AFC shall retain and own all title and, except as expressly 
             licensed herein, all rights and interests (including patent 
             rights, copyrights, trade secret


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                                                                  PAGE 12 OF 42

<PAGE>

             rights, know-how and other intellectual property and proprietary 
             rights throughout the world) in and to (i) the UMC 1000 
             Technology including, without limitation, the UMC 1000 Licensed 
             Technology and CPU System Software (including without limitation 
             all Software and firmware related to the foregoing); (ii) any 
             additional UMC 1000 Enhancements and Improvements developed by 
             AFC pursuant to Section 3 (including without limitation, to the 
             extent applicable thereto): (a) CPU System Software developments, 
             modifications or derivatives thereof and any existing AFC 
             technology/circuit designs on the UMC 1000 Product plug-in cards 
             that are reused in new UMC 1000 Enhancements or Improvements, 
             and (b) new technology/circuit designs of UMC 1000 Product 
             plug-in cards and the new software code which resides in such  
             plug-in cards and controls such new circuit designs); and (iii) 
             any and all portions of the foregoing which are contained or 
             embodied in the Tellabs Technology, discoveries, inventions, 
             works of authorship, ideas or information used or otherwise 
             created by or for Tellabs in the course of its performance under 
             this Agreement.

     4.2     Tellabs shall retain and own all title and, except as expressly 
             licensed herein, all rights and interests (including patent 
             rights, copyrights, trade secret rights, know-how and other 
             intellectual property and proprietary rights throughout the 
             world) in and to the Tellabs Technology.

     4.3     Ownership of Tellabs Funded Developments shall be as set forth 
             in Section 3.2.5 hereof.

     4.4     Each party will execute any documentation reasonably requested 
             by the other party to evidence, record and perfect the 
             assignment and to apply for and obtain recordation of such 
             proprietary rights.


5.   MANUFACTURING RIGHTS AND OEM PRODUCT PURCHASE
     5.1     TELLABS' MANUFACTURING RIGHTS.
             AFC grants Tellabs the right to sell all UMC 1000 Products in 
             Tellabs colors and software, either as provided in the OEM 
             arrangement under Section 5.2 or by exercise of Tellabs' 
             manufacturing rights under this Section 5.1., at Tellabs' 
             option, and subject to Tellabs' marketing rights under Section 7 
             of this Agreement,.

             5.1.1    Subject to all of the terms and conditions of this      
                      Agreement, AFC grants to Tellabs a non-exclusive, 
                      irrevocable, perpetual, worldwide (except as provided 
                      in Section 5.1.2) right and license to manufacture, 
                      have manufactured, distribute, maintain, service and


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                                                                  PAGE 13 OF 42


<PAGE>

                      repair UMC 1000 Products as they exist on the Effective 
                      Date, as well as all Enhancements and Improvements 
                      thereto referred to in Section 3.1.2, for the sole 
                      purpose of enabling manufacture of the Tellabs version 
                      of the UMC 1000 Product(s) for sale to Tellabs' 
                      customers within the scope of Tellabs' marketing rights 
                      under Section 7 of this Agreement.

             5.1.2    Notwithstanding the language in Section 5.1.1, Tellabs 
                      may not exercise its manufacturing rights in China and 
                      India. If AFC has a local manufacturing partner in 
                      China and/or India, AFC agrees to sell the UMC 1000 
                      Product to Tellabs in that territory using the 
                      local manufacturer at the same prices specified in this 
                      Agreement, plus applicable taxes and duties if so 
                      assessed to AFC.

             5.1.3    If Tellabs decides to exercise its manufacturing rights 
                      granted under Section 5.1.1, AFC agrees to provide 
                      Tellabs with the Manufacturing Documentation to enable 
                      Tellabs to purchase, manufacture and test the UMC 1000 
                      Products. The level of information and support provided 
                      to Tellabs shall be at least as detailed as the 
                      information and support AFC provides other AFC 
                      manufacturing organizations, both internal and 
                      external. AFC will, at no charge, provide Tellabs with 
                      the functional test software to allow Tellabs to test 
                      the UMC 1000 Products. AFC also agrees to provide 
                      Tellabs with certain proprietary components for which 
                      AFC will charge Tellabs an amount equal to what AFC 
                      pays for such proprietary components plus a small 
                      handling fee not to exceed fifteen percent (15%) of 
                      AFC's cost. AFC will lower this percentage mark-up 
                      (with an objective of reaching 3%) when and as 
                      permitted by its pre-existing pricing arrangements with 
                      other parties. AFC will update the Manufacturing 
                      Documentation and the functional test software at 
                      all times during the term hereof, as necessary to keep 
                      it current. If requested by Tellabs, AFC will place in 
                      escrow, all technology relating to the proprietary 
                      components, which escrow will be released to Tellabs 
                      for use in exercising its manufacturing rights in the 
                      event AFC ceases to make such proprietary components 
                      available to Tellabs either, (i) due to bankruptcy or 
                      otherwise due to AFC's ceasing to do business, or (ii) 
                      due to AFC's material breach of its obligations to 
                      provide proprietary components. The definition of 
                      "material breach" for purposes of this section will be 
                      agreed at the time the escrow is established.


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<PAGE>

     5.2     TELLABS' OEM ARRANGEMENT OPTION.
             5.2.1    If Tellabs decides not to exercise its manufacturing 
                      rights referenced in Section 5.1.1, in whole or in 
                      part, AFC agrees to sell to Tellabs the UMC 1000 
                      Products in the Tellabs version under the terms of this 
                      Agreement and the OEM Agreement. In addition, AFC 
                      agrees to sell to Tellabs the UMC 1000 Products 
                      Enhancements and Improvements referred to in Section 
                      3.1.3 of this Agreement in the Tellabs version under 
                      the terms of this Agreement and the OEM Agreement.

             5.2.2    The purchase price for any product purchased by Tellabs 
                      under the OEM Agreement shall be the higher of (i) the 
                      manufacturing cost plus five percent (5%) or (ii) 
                      twenty percent (20%) off the U.S. list price. 
                      Notwithstanding the foregoing, Tellabs shall be 
                      entitled to a discount off its purchase price based on 
                      the volume of its purchases, if such discounted price 
                      is lower than the price referred to in the preceding 
                      sentence. AFC's current volume discount is set forth in 
                      Attachment B. If AFC subsequently establishes a more 
                      favorable standard volume discount structure, Tellabs 
                      shall be entitled to the discounts contained therein.

             5.2.3    Product shipments, forecasting, warranty, support, 
                      repair and return, and the like, will be as set forth 
                      in the OEM Agreement. Tellabs is responsible for 
                      developing its own product documentation, however, AFC 
                      agrees to share its customer documentation with 
                      Tellabs, and to allow Tellabs to use, copy and modify 
                      that documentation for its product as needed, at no 
                      charge.

     5.3     AFC'S MANUFACTURING RIGHTS.
             5.3.1    Tellabs Developments will be made available to AFC for 
                      sale in AFC's colors and software, either as provided 
                      in the OEM Agreement, as permitted by Section 5.4 below 
                      or by exercise of AFC's manufacturing rights under this 
                      Section 5.3., at AFC's option, subject to AFC's 
                      marketing rights under Section 7. Subject to the terms 
                      of this Agreement, Tellabs grants to AFC the option to 
                      manufacture the Tellabs Developments for the sole 
                      purpose of manufacturing the UMC 1000 version of such 
                      Tellabs Developments for shipment to its customers, 
                      within the scope of its marketing rights under Section 7 
                      below. Other products which are developed by Tellabs 
                      using the J.V. Product Technology will be made 
                      available to AFC on an OEM basis, on commercially 
                      reasonable terms and conditions to be agreed. AFC will 
                      have no


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                    rights to sell, transfer, license or assign the Tellabs
                    Technology to any third party.

             5.3.2  If AFC decides to exercise its manufacturing rights granted
                    under Section 5.3.1, Tellabs agrees to provide AFC with the
                    Manufacturing Documentation to enable AFC to purchase,
                    manufacture and test the Tellabs Developments which are to
                    be manufactured by AFC.  The level of information and
                    support provided to AFC shall be at least as detailed as the
                    information and support Tellabs provides other Tellabs
                    manufacturing organizations, both internal and external.
                    Tellabs also agrees to provide AFC with certain proprietary
                    components which Tellabs will charge AFC an amount equal to
                    what Tellabs pays for such proprietary components plus a
                    small handling fee, not to exceed fifteen percent (15%) of
                    Tellabs' cost.  This percentage mark-up will be lowered when
                    and as the mark-up in Section 5.1.3 is lowered.  Tellabs
                    agrees to provide AFC with updates to the Manufacturing
                    Documentation as necessary to keep it current during the
                    Term hereof.  If requested by AFC, Tellabs will place in
                    escrow, all technology relating to the proprietary
                    components, which escrow will be released to AFC for use in
                    exercising its manufacturing rights in the event Tellabs
                    ceases to make such proprietary components available to AFC
                    either, (i) due to bankruptcy or otherwise due to Tellabs
                    ceasing to do business, or (ii) due to Tellabs' material
                    breach of its obligations to provide proprietary components.
                    The definition of "material breach" for purposes of this
                    section will be agreed at the time the escrow is
                    established.

     5.4     AFC'S OEM ARRANGEMENT OPTION.
             5.4.1  If AFC decides not to exercise its manufacturing rights
                    referenced in Section 5.3.1., in whole or in part, Tellabs
                    agrees to sell to AFC the AFC version of the Tellabs
                    Developments under the terms of the OEM Agreement and this
                    Agreement.

             5.4.2  If AFC elects to purchase the Tellabs Developments pursuant
                    to the OEM Agreement, the amount AFC will pay for the
                    Tellabs Developments shall be the higher of (i) the
                    manufacturing cost plus five percent (5%) or (ii) twenty
                    percent (20%) off the U.S. list price.  Notwithstanding the
                    foregoing, AFC shall be entitled to a discount off its
                    purchase price based on the volume of its purchases if such
                    discounted price is lower than the price referred to in the
                    preceding sentence.  Tellabs' current volume discount
                    structure is set forth in Attachment B.  If Tellabs
                    subsequently establishes a more favorable


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<PAGE>

                    standard volume discount structure, AFC shall be entitled to
                    the discounts contained therein.

             5.4.3  Product shipments, forecasting, warranty, support, repair
                    and return and the like, will be as set forth in the OEM
                    Agreement between the parties.  AFC is responsible for
                    developing its own product documentation, however, Tellabs
                    agrees to share its customer documentation with AFC, and to
                    allow AFC to use, copy and modify that documentation for its
                    product as needed, at no charge.

     5.5     COMPETITIVE PRODUCTS.
             5.5.1  If (i) Tellabs licenses or sells Tellabs Technology to an
                    AFC Competitor under terms and conditions which would permit
                    the use of the Tellabs Technology with a digital loop
                    carrier product which is competitive with the UMC 1000
                    Product ("Competitive DLC Product"), or if (ii) Tellabs
                    acquires or develops a Competitive DLC Product and ships
                    that product to one or more Alternate Provider(s) in both of
                    the market segments defined below, then, the license granted
                    in Section 2 and the exclusive market rights provided in
                    Section 7, shall immediately terminate (and AFC will
                    immediately be able to sell UMC 1000 Products and Tellabs
                    Developments to Alternate Provider(s) in those market
                    segments) and Tellabs will thereafter have no rights to sell
                    the UMC 1000 Products to new customers.  In such a case, the
                    manufacturing rights and OEM rights granted in Section 3
                    will continue for a period of two (2) years, and thereafter
                    Tellabs will be entitled to continue to purchase the UMC
                    1000 Products under the OEM Agreement for one (1) additional
                    year, in order to continue to support Tellabs' installed
                    base for a total of three (3) years from the time the
                    license is terminated.  Tellabs' royalty obligations will
                    continue during this period.  In addition, in such a case,
                    Tellabs would be required to return to AFC all information
                    relating to the UMC 1000 Licensed Technology, except such
                    information required to manufacture the UMC 1000 Products
                    for support of the installed base.

                    If Tellabs acquires or develops a Competitive DLC Product
                    and ships that product to one or more Alternate Provider(s)
                    in only one of the market segments defined below, then
                    Tellabs will immediately lose its market rights for sales to
                    new customers within that market segment only and AFC will
                    immediately be able to sell UMC 1000 Products and Tellabs
                    Developments to Alternate


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<PAGE>

                    Providers in that market segment.  Tellabs will continue to
                    have manufacturing and OEM rights in accordance with the
                    preceding paragraphs, in order to support existing customers
                    in that market segment for a period of three (3) years.
                    Tellabs' royalty obligations will continue during this
                    period.  All rights with respect to the other market segment
                    will remain in full force and effect.

                    For the purposes of Sections 5.5.1 and 5.5.2, (i) the term
                    "Alternate Provider" includes both "Domestic Alternate
                    Providers" or "Foreign Alternate Providers" and (ii) there
                    are two major market segments (1) an ANSI-based product
                    (T1/SONET) and (2) a CEPT-based product (E1/SDH).  The
                    restrictions set forth in this Section 5.5.1 only apply for
                    international countries into which Tellabs has been granted
                    marketing rights to sell UMC 1000 Products under Section 7
                    below.  Tellabs shall be entitled to acquire, distribute, or
                    perform an independent development and sell and/or
                    distribute any products, including, but not limited to
                    Competitive DLC Products in those countries listed on
                    Attachment E, without losing any rights provided for in this
                    Agreement.

             5.5.2  If (i) AFC makes UMC 1000 Products available to a Tellabs
                    Competitor, or if (ii) AFC acquires or develops a hybrid
                    fiber coax product ("Competitive HFC Product") and ships and
                    sells that product to one or more Alternate Provider(s) in
                    both market segments defined in Section 5.5.1, then AFC will
                    immediately lose its rights as provided in Section 7.1.2 to
                    sell the Tellabs Developments to new customers in both
                    market segments and Tellabs will immediately be able to sell
                    the Tellabs Developments and the UMC 1000 Products (but only
                    in conjunction with sales of Tellabs Developments) to AFC's
                    customers in those market segments.  In such a case, the
                    manufacturing rights granted in Section 3 will continue for
                    a period of two (2) years, and thereafter, AFC will be
                    entitled to continue to purchase the Tellabs Developments
                    under the OEM Agreement for one (1) additional year, in
                    order to continue to support AFC's installed base for the
                    Tellabs Developments for a total period of three (3) years
                    from the period AFC lost its rights to sell the Tellabs
                    Developments to new customers.  AFC's royalty obligations
                    will continue during this period.

                    If AFC acquires or develops a Competitive HFC Product and
                    ships and sells such product to one or more of the Alternate
                    Provider(s) markets in only one of the market segments
                    defined in Section


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                                                                   PAGE 18 OF 42

<PAGE>

                    5.5.1, then AFC will immediately lose its market rights for
                    sales to new customers of Tellabs Developments within that
                    market segment only and Tellabs will immediately be able to
                    sell the Tellabs Developments and the UMC 1000 Products (but
                    only in conjunction with sales of Tellabs Developments) to
                    AFC's customers in that market segment only.  AFC will
                    continue to have manufacturing and OEM rights in accordance
                    with the preceding paragraphs, in order to support existing
                    customers in that market for a period of three (3) years.
                    AFC's royalty obligations will continue during this period.
                    All AFC rights with respect to Tellabs Developments for the
                    other market segment will remain in full force and effect.

             5.5.3  The rights and remedies granted in Section 5.5 shall be the
                    parties' exclusive remedy in the event that; (i) Tellabs
                    licenses or sells Tellabs Technology to an AFC Competitor;
                    (ii) AFC makes UMC 1000 Products available to a Tellabs
                    Competitor; or (iii) the other party develops or acquires a
                    Competitive DLC Product or Competitive HFC Product.

6.   ROYALTY PAYMENTS
     6.1     TELLABS' ROYALTY OBLIGATIONS. Tellabs agrees to pay AFC the
             following royalties:

             a.     [*]

             b.     [*]

             c.     [*]

[*] Confidential treatment requested.
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                                                                   PAGE 19 OF 42

<PAGE>

             d.     [*]

             e.     [*]

     6.2     AFC'S ROYALTY OBLIGATIONS. [*]

     6.3     If either party develops an independent product not incorporating
             the other's party's technology or proprietary rights (as 
             permitted by Section 12), no royalties shall be due for the
             shipment of such independent product(s), except as provided
             in Section 6.2.

     6.4     Either party shall be entitled to have an independent third party
             auditor, reasonably acceptable to the other party, audit compliance
             with this Section 6 no more frequently than once each calendar
             year.  In the event the auditor finds that royalties have been
             underpaid by more than ten percent (10%) of the corrected total
             royalty for the period audited, the audited party shall pay the
             audit fees.  Otherwise, the party requesting the audit shall bear
             the cost of the audit.

[*] Confidential treatment requested.
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                                                                   PAGE 20 OF 42

<PAGE>

7.   MARKET RIGHTS
     7.1     DOMESTIC MARKETING RIGHTS.

             7.1.1  TELLABS MARKETING RIGHTS. Except as set forth in the 
                    third paragraph of this Section 7.1.1, Tellabs will have 
                    exclusive rights to market, sell and otherwise distribute 
                    the Tellabs Developments and/or the UMC 1000 Products, 
                    directly and indirectly through Distributors to the 
                    "Domestic Alternate Provider" market as defined herein, 
                    and AFC shall be prohibited from marketing, selling or 
                    distributing such products, in such market, either 
                    directly or indirectly, through Distributors. The term 
                    "Domestic Alternate Provider" shall mean competitive 
                    access providers (CAPs), alternative local transport 
                    service providers, alternative local access carriers, 
                    multiple system operators (MSOs), or any company, 
                    subsidiary, partnership, co-venture, or other entity 
                    providing alternative telephony services in the United 
                    States. "Domestic Alternate Provider" also includes: 
                    a) AT&T and its Affiliates as of the Effective Date, and 
                    b) the US West Media Group, including, but not limited to 
                    US West International and US West Media One.

                    The term "Domestic Alternate Provider" does not include 
                    (a) wireless service providers except those which are 
                    affiliated with a Domestic Alternate Provider on the 
                    Effective Date; (b) interexchange carrier companies and 
                    their Affiliates as of the Effective Date; (except AT&T 
                    and its Affiliates as of the Effective Date); (c) 
                    telephone companies in the U.S. that operate within their 
                    designated franchise; or d) telephone companies in the 
                    U.S. which operate outside of their designated franchise 
                    territory and build brand new wireline distribution 
                    network(s) (upgrades to an existing cable (coax) network 
                    purchased by a U.S. telephone company outside its 
                    designated franchise territory is not considered a new 
                    network and is therefore a Domestic Alternate Provider).

                    Exceptions to this Tellabs exclusive market right are:

                    7.1.1.1  Tellabs and AFC will both be entitled to sell 
                             into the CAP market, each having an exclusive 
                             customer segment. Subject to subsection 7.1.1.2 
                             below, Tellabs shall have the exclusive 
                             marketing right to CAPs that are majority owned 
                             by the multiple system operators ("MSOs") as 
                             of April 1, 1996, and to the customers listed in 
                             Attachment C. Subject to


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                                                                  PAGE 21 OF 42

<PAGE>

                             subsection 7.1.1.3 below, marketing rights to 
                             all other CAPs will belong to AFC.

                    7.1.1.2  In order for Tellabs to retain exclusive 
                             marketing rights to the CAPs listed in 
                             Attachment C, Tellabs must generate at least $12 
                             million in Net Revenue of Tellabs Developments 
                             and UMC 1000 Products from the customers listed 
                             on Attachment C, over the next two (2) years 
                             dating from April 1, 1996. If Tellabs fails to 
                             meet this objective, then Tellabs will lose its 
                             exclusivity in the CAP accounts in Attachment C. 
                             Notwithstanding the foregoing, Tellabs can 
                             maintain exclusivity by paying the royalty 
                             equivalent (calculated pursuant to Section 6) 
                             due on the difference between Net Revenue 
                             actually achieved from such customers and $12 
                             million. If Tellabs achieves the $12 million 
                             minimum, AFC and Tellabs will reset new minimums 
                             for succeeding years. Such new minimums will be 
                             no less than $6 million per year and shall be 
                             subject to the other terms of this subsection.

                    7.1.1.3  If, after the Effective Date, a Domestic 
                             Alternate Provider is acquired by a company for 
                             which AFC has exclusive market rights as defined 
                             in Section 7.1.2, Tellabs shall retain exclusive 
                             rights to the business segment of the acquired 
                             entity (regardless of whether that entity 
                             remains a separate business unit). If the 
                             acquiring company wants to consolidate 
                             purchasing, AFC must inform the Customer that 
                             Tellabs has the exclusive marketing rights to 
                             sell to the acquired entity of the business for 
                             two (2) years from the Effective Date. After the 
                             two year period, if the Customer still wants to 
                             consolidate, Tellabs shall be entitled to 
                             negotiate continued sales of the Tellabs 
                             Developments and the UMC 1000 Products to the 
                             acquired entity. If Tellabs is successful in 
                             convincing the customer not to consolidate, 
                             Tellabs will continue to sell to the acquired 
                             entity. Tellabs will be given sixty (60) days to 
                             convince the customer not to consolidate. If 
                             after the sixty-day period Tellabs has failed to 
                             convince the customer not to consolidate, then 
                             AFC will be entitled to sell to the acquired 
                             entity on an exclusive basis and will pay 
                             a royalty of thirteen percent (13%) to Tellabs on 
                             all Net Revenue from sales to that acquired 
                             entity of Tellabs Developments manufactured by 
                             AFC and any product being sold by AFC, which is 
                             competitive with any Tellabs Development. For 
                             purposes of this Section 7.1.1.3 and for

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                                                                  PAGE 22 OF 42


<PAGE>

                             purposes of Section 7.1.2, "acquisition" or 
                             "acquir(ed)" means the acquisition of greater 
                             than fifty percent (50%) of the equity of a 
                             company.

             7.1.2  AFC MARKETING RIGHTS.
                    Except as provided in Section 7.1.1, AFC will have 
                    exclusive rights to market, sell and otherwise distribute 
                    UMC 1000 Products and the Tellabs Developments to all 
                    other customers in the United States, and Tellabs shall 
                    be prohibited from marketing, selling or distributing 
                    such products, to any such customers, either directly or 
                    indirectly.

                    If, after the Effective Date, a company for which AFC has 
                    exclusive marketing rights is acquired by a Domestic 
                    Alternate Provider or a company listed on Attachment D, 
                    then AFC shall retain exclusive rights to the business 
                    segment of the acquired entity (regardless of whether 
                    that entity remains a separate business unit). If the 
                    acquiring company wants to consolidate purchasing, 
                    Tellabs must inform the customer that AFC has the 
                    exclusive marketing rights to sell to the acquired entity 
                    for two years from the Effective Date. After the two year 
                    period, if the customer still wants to consolidate, AFC 
                    shall be entitled to negotiate continued sales of the 
                    Tellabs Developments and UMC 1000 Products to the 
                    acquired entity. If AFC is successful in convincing the 
                    customer not to consolidate, AFC will continue to sell to 
                    the acquired entity. AFC will be given sixty (60) days to 
                    convince the customer not to consolidate. If after the 
                    sixty-day period AFC has failed to convince the customer 
                    not to consolidate, then Tellabs will be entitled to sell 
                    to the acquired entity on an exclusive basis and pay an 
                    additional royalty of two percent (2%) to AFC on all Net 
                    Revenue from sales to that acquired entity of UMC 1000 
                    Products manufactured by Tellabs.

     7.2     INTERNATIONAL MARKETING RIGHTS.

             7.2.1  TELLABS MARKETING RIGHTS. Except as set forth in the 
                    third paragraph of this Section 7.2.1, Tellabs will have 
                    exclusive rights to market, sell and distribute the 
                    Tellabs Developments and/or the UMC 1000 Products, 
                    directly and indirectly through Distributors to Foreign 
                    Alternate Providers in the following countries:

                            The United Kingdom, Australia, Japan, 
                            France, Germany, Spain, Portugal, Italy, 
                            Switzerland, Austria, Luxembourg, Belgium, 
                            The Netherlands,


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                                                                  PAGE 23 OF 42

<PAGE>
                            Denmark, Ireland, Sweden, Finland, Norway, 
                            Greece, New Zealand, Saudi Arabia, Hong 
                            Kong, Singapore, Canada, Israel and Korea.

                    The term "Foreign Alternate Provider" shall mean 
                    competitive access providers ("CAPs"), alternative local 
                    transport service providers, alternative local access 
                    carriers, multiple system operators ("MSO"), or any 
                    company, subsidiary, partnership, co-venture, or other 
                    entity providing alternative telephony services outside 
                    of the United States. This also includes but is not 
                    limited to consortiums, joint ventures, partnerships, 
                    private companies, and/or other government agencies that 
                    compete with the local PTT for telephone service in a 
                    given territory. "Foreign Alternate Provider" does not 
                    include wireless service providers except those 
                    affiliated with a Foreign Alternate Provider.

                    Exceptions to this Tellabs exclusive market right are:
                    7.2.1.1  In order for Tellabs to retain exclusivity to 
                             the Foreign Alternate Provider market in a given 
                             country, Tellabs will be required to meet 
                             minimum Net Revenues of Tellabs Developments and 
                             UMC 1000 Products for such country. The starting 
                             time period required to obtain these minimum 
                             sales revenues will begin on the later to occur 
                             of: (i) the first date that any Foreign 
                             Alternate Provider in that country has provided 
                             residential dial tone (i.e., a competitive 
                             market exists), and (ii) the date on which UMC 
                             1000 Product meets the market requirements for 
                             that Foreign Alternate Provider market segment. 
                             The UMC 1000 Product will be deemed to meet the 
                             market requirements for an Foreign Alternate 
                             Provider market when the UMC 1000 Product has a 
                             released V5.1/2 digital switch interface for the 
                             switch vendor used by the Foreign Alternate 
                             Provider, channel cards with the proper 
                             impedance, and regulatory compliance for that 
                             market/country. Once these two criteria are met 
                             for each country, a minimum of $2,000,000 in 
                             cumulative Net Revenue of Tellabs Developments 
                             and UMC 1000 Products is required for the first 
                             three (3) years per country. Thereafter, a 
                             minimum of US $2,000,000 per year in Net Revenue 
                             of Tellabs Developments and UMC 1000 Products is 
                             required. Failure to make these Net Revenue 
                             targets within these timeframes in a particular 
                             country will remove the exclusivity in that 
                             country for Tellabs and Tellabs will hereafter 
                             have non-exclusive rights in that country. The

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                                                                  PAGE 24 OF 42

<PAGE>

                             non-exclusive rights are subject to termination 
                             under the circumstances set forth in Section 5.5 
                             and Section 14.

                    7.2.1.2  If, after the Effective Date, a Foreign 
                             Alternate Provider is acquired by a company for 
                             which AFC has exclusive market rights as defined 
                             in Section 7.2.2, Tellabs shall retain exclusive 
                             rights to the business segment of the acquired 
                             entity (regardless of whether that entity 
                             remains a separate business unit). If the 
                             acquiring company wants to consolidate 
                             purchasing, AFC must inform the customer that 
                             Tellabs has the exclusive marketing rights to 
                             sell to the acquired entity of the business for 
                             two years from the Effective Date. After the two 
                             year period, if the customer still wants to 
                             consolidate, Tellabs shall be entitled to 
                             negotiate continued sales of the Tellabs 
                             Developments and the UMC 1000 Products to the 
                             acquired entity. If Tellabs is successful in 
                             convincing the customer not to consolidate, 
                             Tellabs will continue to sell to the acquired 
                             entity. Tellabs will be given sixty (60) days to 
                             convince the customer not to consolidate. If 
                             after the sixty-day period Tellabs has failed to 
                             convince the customer not to consolidate, then 
                             AFC will be entitled to sell to the acquired 
                             entity on an exclusive basis and will pay a 
                             royalty of thirteen percent (13%) to Tellabs on 
                             all Net Revenue from sales to that acquired 
                             entity of Tellabs Developments manufactured by 
                             AFC and any product being sold by AFC, which is 
                             competitive with any Tellabs Development.

                    Tellabs will have non-exclusive rights to sell the 
                    Tellabs Developments and/or the UMC 1000 Products to 
                    Foreign Alternate Providers in all other countries. 

                    Notwithstanding the foregoing, AFC shall be entitled to 
                    continue to exercise its rights under the existing AFC 
                    agreements listed in Attachment E. In these countries, 
                    Tellabs will have only a non-exclusive right to sell the 
                    UMC 1000 Products if they are sold in conjunction with 
                    Tellabs Developments. AFC agrees to use its best efforts 
                    to amend each of these existing agreements to allow 
                    Tellabs to sell the UMC 1000 Products into the Attachment 
                    E countries.

             7.2.2  AFC MARKETING RIGHTS
                    Except as provided in Section 7.2.1, AFC will have 
                    exclusive rights to market, sell and otherwise distribute 
                    UMC 1000 Products and 


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<PAGE>

                    the Tellabs Developments to all other customers outside the
                    United States, and Tellabs shall be prohibited from
                    marketing, selling or distributing such products, to any
                    such customers, either directly or indirectly.

                    If, after the Effective Date, a company for which AFC has
                    exclusive marketing rights is purchased by a Foreign
                    Alternate Provider, then AFC shall retain exclusive rights
                    to the business segment of the acquired entity (regardless
                    of whether that entity remains at separate business unit).
                    If the acquiring company wants to consolidate purchasing,
                    Tellabs must inform the customer that AFC has the exclusive
                    marketing rights to sell to the acquired entity for two
                    years from the Effective Date.  After the two year period,
                    if the customer still wants to consolidate, AFC shall be
                    entitled to negotiate continued sales of the Tellabs
                    Developments and UMC 1000 Products to the acquired entity.
                    If AFC is successful in convincing the customer not to
                    consolidate, AFC will continue to sell to the acquired
                    entity.  AFC will be given sixty 960) days to convince the
                    customer not to consolidate.  If after the sixty-day period
                    AFC has failed to convince the customer not to consolidate,
                    then Tellabs will be entitled to sell to the acquired entity
                    on an exclusive basis and pay an additional royalty of two
                    percent (2%) to AFC on all Net Revenue from sales to that
                    acquired entity of UMC 1000 Product manufactured by Tellabs.

                    Nothing contained herein shall be construed as granting any
                    rights to AFC in connection with any other products
                    developed using the Tellabs Technology (except as expressly
                    stated in Section 5.3.1).

     7.3     HOLDING COMPANIES.
             7.3.1  For purposes of this section, the term "Holding Company"
                    shall mean cable or telephone holding companies, joint
                    ventures, partnerships or other organizations with
                    affiliates, partners or members ("Entities") consisting of
                    both (i) Entities for which Tellabs has exclusive market
                    rights, and (ii) Entities for which AFC has exclusive market
                    rights, whether domestic or international.  In order to be
                    considered an Entity hereunder, the affiliate, partner
                    and/or member must be more than fifty percent (50%) owned by
                    another Entity.  Except under the circumstances described in
                    Section 7.3.3 below, each party will retain its market
                    rights to sell the UMC 1000 Products and/or the Tellabs
                    Developments to their respective accounts within a Holding
                    Company.


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<PAGE>

             7.3.2  A Holding Company shall be defined as an Alternate Provider
                    if more of its combined annual revenue for the most recently
                    completed fiscal year ("Annual Revenue") is derived from
                    Foreign and/or Domestic Alternate Provider Entities within
                    the Holding Company than from Entities within AFC's
                    exclusive market segment.  Attachment D identifies the
                    Holding Companies that Tellabs has identified as being
                    Alternate Providers as of April 1, 1996.  Tellabs will hold
                    exclusive market rights to these companies under the
                    circumstances set forth in Section 7.3.3  On a going forward
                    basis, any Holding Company which has not been identified by
                    Tellabs on Attachment D or which did not exist as of April
                    1, 1996, shall be determined as follows:

                    7.3.2.1   If the Holding Company is not listed on Attachment
                              D, the first question is whether the Holding
                              Company was in existence on April 1, 1996.  If the
                              Holding Company existed on April 1, 1996, and
                              Tellabs shows that more of such company's Annual
                              Revenue as of April 1, 1996 was derived from
                              Entities which were Foreign and/ or Domestic
                              Alternate Provider's Entities than from within
                              AFC's exclusive market segment, then the Holding
                              company will be added to the list on Attachment D
                              and Tellabs will have exclusive market rights
                              therein under the circumstances set forth in
                              Section 7.3.3.  If Tellabs is unable to prove
                              this, then AFC will have exclusive market rights
                              for the Holding Company, under the circumstances
                              in Section 7.3.3.

                    7.3.2.2   If a Holding Company came/comes into existence
                              after April 1, 1996, and Tellabs can show that at
                              the time the Holding Company came into existence,
                              more of its Annual Revenue was derived from
                              Foreign and/ or Domestic Alternate Provider
                              Entities than from Entities within AFC's exclusive
                              market segments, then the Holding Company will be
                              added to the list on Attachment D. Similarly, if
                              AFC can show that at the time the Holding Company
                              came into existence, more of its Annual Revenue
                              was derived from Entities within AFC's exclusive
                              market segments than from Entities with Tellabs'
                              exclusive market segments, then AFC will have the
                              exclusive market rights for such Holding Company
                              under the circumstances set forth in Section
                              7.3.3.  If neither company has made the showing
                              required by the prior two sentences, the Holding
                              Company will continue as unidentified until either
                              Tellabs or AFC decides it wants to


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                                                                   PAGE 27 OF 42

<PAGE>

                              sell to the Holding Company.  At such time, both
                              Tellabs and AFC shall meet to determine whether or
                              not the Holding Company is an Alternate Provider
                              which will be added to Attachment D and will
                              therefore be Tellabs' exclusive customer under the
                              circumstances set forth in Section 7.3.3. In
                              making that determination, the parties will first
                              attempt to calculate whether the Holding Company
                              was an Alternate Provider (as defined above) on
                              the date it came into existence. If they are
                              unable to reasonably make that determination, they
                              will make such assessment as of the date on which
                              the determination is being made.

             7.3.3  Under the circumstances set forth in the remainder of this
                    section below, Tellabs will be granted exclusive market
                    rights to Holding Companies which have been deemed
                    "Alternate Providers" and AFC will be deemed to have
                    exclusive market rights to any other Holding Company. If any
                    Holding Company wants to consolidate its purchasing, neither
                    party shall have the right to will UMC 1000 Products and
                    Tellabs Developments into the other party's accounts within
                    a Holding Company for two (2) years form April 1, 1996.
                    After the two-year period, if such Holding Company still
                    wants to consolidate, the party that does not have exclusive
                    market rights (as determined pursuant to Section 7.3.2) has
                    the right to negotiate continued sales with that customer 
                    in its market segment only. If that party is successful 
                    in convincing the organization not to consolidate, that 
                    party will continue to sell into its market/customer 
                    segment. Such party will be given sixty (60) days to 
                    convince the organization not to consolidate. If after 
                    the sixty (60) day period the party fails to convince the 
                    organization not to consolidate, then the other party 
                    will assume this market right and pay royalties to the 
                    other party pursuant to either Section 7.2.1.2 or 7.2.2, 
                    as applicable.

     7.4     With their respective markets, the parties are free to distribute
             their respective products either directly to End Users or
             indirectly through third party channels, such as Distributors or
             sales representatives. Sales through such third party channels are
             permissible only if the party has entered into a written agreement
             with the third party which allows the party to terminate the
             distribution rights if the third party if the third party 
             distributes the product outside such party's respective 
             markets(s). Both parties shall take all reasonable steps to 
             enforce these rights, including but not limited to terminating 
             the Distribution Agreement and/or refusing to ship products 
             unless prohibited from doing so by court or government order.

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8.   WARRANTY AND INDEMNIFICATION
     8.1     OWNERSHIP WARRANTY AS TO UMC 1000 TECHNOLOGY.
             AFC represents and warrants to Tellabs that (i) the UMC 1000
             Technology is original with and is owned solely by AFC; (ii)
             neither the UMC 1000 Technology nor any AFC Products sold under the
             OEM Agreement infringe any patent, copyright, trade secret or other
             proprietary rights of any third party; (iii) AFC is the sole and
             exclusive developer of the UMC 1000 Technology or has the right to
             grant the rights granted under this License Agreement; (iv) AFC has
             not previously or otherwise granted any other right in the UMC 1000
             Technology to any third party which may conflict with the rights
             granted herein to Tellabs; and (v) AFC has the full power to enter
             into this Agreement, to carry out its obligations contained herein,
             and to grant the rights in the UMC 1000 Technology granted herein
             to Tellabs.

     8.2     OWNERSHIP WARRANTY AS TO TELLABS TECHNOLOGY.
             Tellabs represents and warrants to AFC that (i) the Tellabs
             Technology is original with and is owned solely by Tellabs; (ii)
             neither the Tellabs Technology nor any Tellabs Products sold under
             the OEM Agreement infringe any patent, copyright, trade secret or
             other proprietary rights of any third party; (iii) Tellabs is the
             sole and exclusive developer of the Tellabs Technology or has 
             the right to grant the rights granted under this License 
             Agreement; (iv) Tellabs has not previously or otherwise granted 
             any other right in Tellabs Technology to any third party which 
             may conflict with the rights granted herein to AFC; and (v) 
             Tellabs has the full power to enter into this Agreement, to 
             carry out its obligations contained herein, and to grant the 
             rights in the Tellabs Technology granted herein to AFC.

     8.3     JOINTLY-OWNED TECHNOLOGY
             Except as expressly stated in this Section 8, neither party shall
             have any obligations to the other party with respect to the
             ownership and/or rights of the Joint Technology or with respect to
             jointly-owned technology pursuant to Section 3.2 of this Agreement.
             Each party shall bear sole responsibility for any indemnification
             with respect to their respective customers relating to the Joint
             Technology and any jointly-owned technology pursuant to Section
             3.2, and each party shall indemnify the other party (pursuant to
             Section 8.4 below) for any claims made by such customers and/or
             other third parties who derive their rights from such party.


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     8.4     INFRINGEMENT. Each party ("Indemnifying Party") shall hold the
             other party ("Indemnified Party") and its officers, directors
             agents and employees harmless from liability resulting from breach
             of the warranty contained in Sections 8.1 and 8.2, respectively,
             and from third parties' claims relating to the Joint Technology and
             any jointly-owned technology pursuant to Section 3.2, as provided
             in Section 8.3, provided that: (i) the Indemnifying Party is
             promptly notified of any and all threats, claims and proceeding
             related thereto, (ii) the Indemnifying Party shall have sole
             control of the defense and/or settlement thereof, (iii) the
             Indemnified Party furnishes to the Indemnifying Party, upon
             request, information available to the Indemnified Party for such
             defense, and (iv) the Indemnified Party provides the Indemnifying
             Party with reasonable assistance. This obligation of the
             Indemnifying Party does not apply with respect to the UMC 1000
             Products or the Tellabs Developments (as applicable), or portions
             or components of the foregoing (a) not supplied by the Indemnifying
             Party, (b) made in whole or in part in accordance to the
             Indemnified Party's specifications, (c) that are modified after
             delivery by the Indemnifying Party, if the alleged infringement
             relates to such modification, (d) combined with other products,
             processes or materials where the alleged infringement relates to
             such combination, (e) where the Indemnified Party continues
             allegedly infringing activity after being notified thereof or after
             being informed of modifications that would have avoided the alleged
             infringement, or (f) where the Indemnified Party's use of the
             foregoing is not strictly in accordance with the license granted
             under this Agreement. Should any of the products furnished and/or
             in purchase orders placed under the OEM Agreement, or in the
             operation thereof, become the subject of a claim of any
             infringement of a United States or foreign patent, trademark,
             copyright, trade secret or other proprietary interest, the
             Indemnifying Party shall, at its expense and at its option, either
             procure for the Indemnified Party the right to continue using the
             Products, replace or modify the same so that they become non-
             infringing, or, if replacement or modification is not possible,
             refund the full purchase price of the infringing items.


     9.      LIMITATION OF LIABILITY
             NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY LOST PROFITS,
             LOSS OF DATA OR FOR ANY OTHER INDIRECT, SPECIAL, OR CONSEQUENTIAL
             DAMAGES, ARISING OUT OF THIS AGREEMENT OR THE TRANSACTIONS
             CONTEMPLATED HEREBY, EVEN IF ADVISED OF THE POSSIBILITY OR
             LIKELIHOOD OF SUCH DAMAGES, EXCEPT AS EXPRESSLY LIMITED BY LAW AND
             EXCEPT FOR DAMAGES UNDER SECTION 8.4 EXCEPT AS EXPRESSLY PROVIDED
             HEREIN, THE PARTIES


- --------------------------------------------------------------------------------
                                                                   PAGE 30 OF 42

<PAGE>

     DISCLAIM ANY AND ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT
     LIMITATION, THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
     PURPOSE.

10.  CONFIDENTIALITY
     10.1    Each party ("disclosing party") may, from time to time, in
             connection with performance under this Agreement, disclose
             confidential information to the other party ("receiving party").
             The receiving party agrees not to use (other than for purposes
             contemplated by this Agreement), and will use reasonable efforts
             to prevent the disclosure to third parties of, any of the
             disclosing party's confidential information that is identified as
             confidential at the time of disclosure and is provided in tangible
             form marked "confidential" or "proprietary" (or is reduced to such
             form within thirty (30) days after oral disclosure). All UMC 1000
             Technology, UMC 1000 CPU System Software (including, without
             limitation, the source code thereof, and except the object code and
             end user documentation) and all AFC product roll-out plans, product
             definitions, development schedules and other business, marketing or
             technical information provided to Tellabs pursuant to this
             Agreement or otherwise, are hereby identified and marked as AFC's
             confidential information, and Tellabs so acknowledges.  All Tellabs
             Technology and all Tellabs product roll-out (including, without
             limitation, the source code thereof, and except the object code and
             end user documentation) and all Tellabs Technology and all Tellabs
             product roll-out plans, product definitions, development schedules
             and other business, marketing or technical information provided to
             Tellabs pursuant to this Agreement or otherwise, are hereby
             identified and marked as Tellabs' confidential information, and AFC
             so acknowledges. Each of the parties further acknowledge that they
             are aware and will advise their employees who have access to
             confidential information of the other party of the restrictions
             imposed by the United States securities laws on the purchase or
             sale of securities by any person who has received material, non-
             public information from the issuer of such securities and on the
             communication of such information to any other person when it is
             reasonably foreseeable that such other person is likely to purchase
             or sell such securities in reliance upon such information. The
             receiving party's confidentiality obligation hereunder shall not
             apply to information that the receiving party can document:

             (i)    was in the receiving party's possession or known by it prior
                    to receipt from the disclosing party;


- --------------------------------------------------------------------------------
                                                                   PAGE 31 OF 42


<PAGE>

             (ii)   is or (through no fault of the receiving party) becomes
                    generally available to the public;

             (iii)  is rightfully disclosed to the receiving party by a third
                    party having no obligations of confidentiality to the
                    disclosing party, provided the receiving party complies with
                    any restrictions imposed by the third party; or

             (iv)   is required by law or regulation to be disclosed (including,
                    without limitation, in connection with SEC filings),
                    provided that the receiving party uses reasonable efforts to
                    restrict disclosure and to obtain confidential treatment
                    therefor.

     10.2    Each receiving party acknowledges and agrees that due to the
             unique nature of the disclosing party's confidential information,
             there can be no adequate remedy at law for any breach of its
             obligations hereunder, that any such breach may allow the receiving
             party or third parties to unfairly compete with the disclosing
             party resulting in irreparable harm to the disclosing party and,
             therefore, that upon any such breach or threat thereof, the
             disclosing party shall be entitled to injunctive relief and other
             appropriate equitable relief in addition to whatever remedies it
             may have at law, and to be indemnified by the receiving party from
             any loss or harm (including, without limitation, attorneys' fees)
             in connection with any breach or enforcement of the receiving
             party's obligations hereunder or the unauthorized use or release of
             any confidential information. The receiving party will notify the
             disclosing party in writing immediately upon the occurrence of any
             such unauthorized release or other breach of which it is aware.

     10.3    Tellabs acknowledges that the UMC 1000 Licensed Technology and UMC
             1000 CPU System Software are the exclusive property of AFC, and
             contain valuable trade secrets containing proprietary and
             confidential information.  Tellabs agrees to protect the
             confidentiality of the UMC 1000 Licensed Technology and UMC 1000
             CPU System Software as follows: Tellabs shall limit use of, and
             access to, the UMC 1000 Licensed Technology and UMC 1000 CPU System
             Software to those of its employees, subcontractors and agents who
             are directly involved in implementing the permitted use of the UMC
             1000 Licensed Technology and UMC 1000 CPU System Software under
             this Agreement; who have a need to know the contents of the UMC
             1000 Licensed Technology and UMC 1000 CPU System Software for the
             performance of their duties in connection with such use; and who
             have entered into confidentiality agreements with Tellabs. Tellabs
             shall implement such internal


- --------------------------------------------------------------------------------
                                                                   PAGE 32 OF 42


<PAGE>

             procedures, and take such precautions, as are necessary to protect
             the confidentiality of the UMC 1000 Licensed Technology and UMC
             1000 CPU System Software. In no event shall Tellabs implement
             procedures or take precautions to protect the UMC 1000 Licensed
             Technology and UMC 1000 CPU System Software which are less rigorous
             than procedures established to protect its own confidential
             technology and other highly confidential information.

     10.4    AFC acknowledges that the Tellabs Technology and the Licensed J.V.
             Products are the exclusive property of Tellabs, and contain
             valuable trade secrets containing proprietary and confidential
             information. AFC agrees to protect the confidentiality of the
             Tellabs Technology and the Licensed J.V. Products are as follows:
             AFC shall limit use of, and access to, the Tellabs Technology and
             the Licensed J.V. Products to those of its employee subcontractors
             and agents who are directly involved in implementing the permitted
             use of the Tellabs Technology and the Licensed J.V. Products under
             this Agreement; who have a need to know the contents of the Tellabs
             Technology and the Licensed J.V. Products for the performance of
             their duties in connection with such use; and who have entered
             into confidentiality agreements with AFC. AFC shall implement such
             internal procedures, and take such precautions, as are necessary to
             protect the confidentiality of the Tellabs Technology and the
             Licensed J.V. Products. In no event shall AFC implement procedures
             or take precautions to protect the Tellabs Technology and the
             Licensed J.V. Products which are less rigorous than procedures
             established to protect its own confidential technology and other
             highly confidential information.

11.  THIRD PARTY MATTERS
     11.1    DISCLOSURE TO OTHER PARTIES.
             Each party shall have the right to disclose to third parties
             certain technical Confidential Information relating to
             interoperability and network management, and certain non-technical
             Confidential Information relating to the status and terms of the
             relationship between Tellabs and AFC; provided, however, that such
             third parties agree to confidentiality and nondisclosure provisions
             substantially similar to those set forth in Section 10
             (Confidentiality) hereof.


     11.2    THIRD PARTY SOFTWARE
             Certain third party software may be incorporated by the parties
             from time to time into the products and/or technology licensed
             pursuant to this Agreement. Each party shall (a) identify all such
             third party software which is incorporated into such party's
             products or technology licensed to


- --------------------------------------------------------------------------------
                                                                   PAGE 33 OF 42

<PAGE>

             the other party pursuant to this Agreement, (b) comply fully with
             all terms and conditions applicable to the sublicensing,
             disclosures or copying of such third party software, and (c)
             provide reasonable assistance to the other party in securing
             necessary and appropriate license rights in such third party
             software; provided, however, that all costs incurred in connection
             with the transfer of any license rights to the third party software
             shall be borne by the party acquiring such license rights.



12.  INDEPENDENT DEVELOPMENT
     Nothing contained in this Agreement shall be construed as a restriction on
     either party's right independently to develop, manufacture, acquire and 
     sell or otherwise distribute, for itself or others, any product whether or
     not it is similar in function to the UMC 1000 Product(s) or the Tellabs
     Developments, provided that such development, manufacture, acquisition,
     sale or other distribution does not violate any of the provisions of this
     Agreement.  Except as provided in Section 7.2, no payment shall be due to
     either party by reason of such independent development, manufacture and/or
     sale or other distribution.


13.  DEFAULT
     13.1    DEFAULT OF TELLABS
             Tellabs shall be deemed to be in material default under this
             Agreement upon the occurrence of any of the following:
             13.1.1 In the event that Tellabs violates the terms of Section 10
                    (Confidentiality) (other than violations which are
                    immaterial).

             13.1.2 In the event that Tellabs fails to perform or comply with
                    any other material term or condition of this Agreement and
                    fails to cure such failure within thirty (30) days after
                    receipt of written notice from AFC; provided, however, that
                    an alleged default in making payments hereunder shall not
                    afford AFC right to terminate if and while Tellabs
                    reasonably disputes the obligation to make such payments or
                    the amount due.

     13.2    DEFAULT OF AFC
             AFC shall be deemed to be in material default under this Agreement
             upon the occurrence of any of the following:
             13.2.1 In the event that AFC violates the terms of Section 10
                    (Confidentiality) (other than violations which are
                    immaterial).

             13.2.2 In the event that AFC fails to perform or comply with any
                    other material term or condition of this Agreement and fails
                    to cure such


- --------------------------------------------------------------------------------
                                                                   PAGE 34 OF 42

<PAGE>

                    failure within thirty (30) days after receipt of written
                    notice from Tellabs; provided, however, that an alleged
                    default in making payments hereunder shall not afford
                    Tellabs a right to terminate if and while AFC reasonably
                    disputes the obligation to make such payments or the amount
                    due.

     13.3    DEFAULT REMEDIES
             Upon a material default by either party hereunder, as specified in
             Sections 13.1 and 13.2 above, the non-defaulting party may seek any
             remedies available to it in law and equity, including termination
             of this Agreement under Section 14.1 or 14.2 (except as expressly
             provided otherwise in Sections 2.8 and 5.3.3 of this Agreement).
             For purposes of Sections 13 and 14 hereof, the party electing to
             terminate this Agreement will be deemed to be the "Terminating
             Party" and the other party shall be deemed to be the "Terminated
             Party." Notwithstanding the foregoing, except where a party
             reasonably believes irreparable harm may occur and brings an action
             for injunctive relief, the parties shall follow the dispute
             resolution procedures specified in Section 16.5 before commencing
             litigation arising out of a default hereunder.

14.  TERM, EXPIRATION AND TERMINATION
     14.1    TERM.
             Unless terminated earlier as provided herein, this Agreement shall
             have an initial term of ten (10) years commencing on the Effective
             Date, and shall be automatically renewed for successive one (1)
             year terms unless either of the parties hereto gives to the other
             party written notice of its election to terminate this Agreement at
             least sixty (60) days prior to the expiration of the then current
             term.

     14.2    EFFECT OF EXPIRATION
             Unless this Agreement is renewed by mutual agreement of the
             parties, upon the expiration of the term referred to in Section
             14.1, as may be extended, the following consequences shall ensue:

             14.2.1 The parties agree to negotiate in good faith the terms and
                    conditions covering the winding down of this Agreement,
                    including the completion of any Enhancements and 
                    Improvements then in process.

             14.2.2 It is the intention of the parties that except as provided
                    in subsection 14.2.3 below, the technology license rights
                    and manufacturing rights (including accompanying royalty
                    obligations)



- --------------------------------------------------------------------------------
                                                                   PAGE 35 OF 42

<PAGE>

                    described in this Agreement will survive the expiration of
                    this Agreement; provided, however, that any such license or
                    manufacturing rights (and the accompanying royalty
                    obligations) shall thereafter be subject to termination
                    under the circumstances described in Sections 14.3 and 14.4
                    of this Agreement.

             14.2.3 The parties' obligations to provide continuing updates to
                    technology under Sections 2 and 3 shall terminate.

             14.2.4 The following sections of this Agreement will be deemed to
                    survive such expiration: 1, 2, 3.2.5, 4, 5.1, 5.3, 5.5, 6,
                    7, 8, 9, 10, 11, 12, 13, 14, 15 and 16, as well as any
                    provisions hereof which by their terms involve obligations
                    which survive expiration of this Agreement.

     14.3    TERMINATION OF ENTIRE AGREEMENT.
             This Agreement may be terminated in its entirety (subject only to
             the survival of specific sections specified in Section 14.6 hereof)
             under the circumstances specified in 13.3 hereof.

     14.4    PARTIAL TERMINATION.
             Notwithstanding anything to the contrary herein contained, a
             Terminating Party entitled to terminate this Agreement pursuant to
             Section 13.3 may, at its election, only partially terminate this
             Agreement by terminating all revocable (as provided in Section
             14.5) license rights of the Terminated Party, while not terminating
             its own license and manufacturing rights, with the effect set forth
             in Section 14.5 below.  In such a case, this Agreement shall remain
             in partial force and effect, and the Terminated Party for the
             remainder of the Term of this Agreement (unless the Terminated
             Party terminates this Agreement in accordance with the terms of
             this Section 14).  Notwithstanding the foregoing, the Terminating
             Party may, at any time prior to the end of the Term, elect to
             terminate this Agreement in its entirety, with the effect set forth
             in Section 14.5 below.

     14.5    EFFECT OF TERMINATION
             14.5.1 TERMINATION BY EITHER PARTY
                    In the event that this Agreement is terminated by either
                    party, in whole or in part, as provided in Sections 14.3 or
                    14.4:
                    14.5.1.1  It is the intention of the parties that except in
                              the circumstances described in Section 14.5.1.2
                              below, all technology license rights and
                              manufacturing rights described in this Agreement
                              will survive the

- --------------------------------------------------------------------------------
                                                                   PAGE 36 OF 42

<PAGE>

                              termination of this Agreement; provided, however,
                              that any such license or manufacturing rights
                              shall be subject to termination under the
                              circumstances described in Section 14.5.1.2 below.
                              The parties agree that except as expressly
                              provided in this Section 14.5, royalty obligations
                              of the parties in effect immediately prior to the
                              termination shall remain in full force and effect
                              after termination.

                    14.5.1.2  In the event of whole or partial termination due
                              to a material breach of any of the clauses
                              specifically referenced below, the Terminating
                              Party also shall have the option to terminate
                              certain of the Terminated Party's license rights
                              under the limited circumstances described below:

                              (A)  In the event of a breach by AFC of those
                                   obligations referenced in Sections 3.1, 5.1,
                                   5.2, 6.2, 7.1.1, 7.2.1, 7.3, 7.4, 10, 11 and
                                   12 hereof, then Tellabs shall have the option
                                   to terminate effective immediately, all of
                                   AFC's rights to Tellabs Technology as set
                                   forth in Sections 5 and 7.

                              (B)  In the event of a breach by Tellabs of those
                                   obligations referenced in Sections 2, 5.3,
                                   5.4, 6.1, 7.1.2, 7.2.2, 7.3, 7.4, 10, 11, 12,
                                   and except as provided in Section 2.8, then
                                   AFC shall have the option to terminate,
                                   effective immediately, all of Tellabs'
                                   license rights to UMC 1000 Licensed
                                   Technology as set forth in Sections 2, 3, 5
                                   and 7 hereof;

                    14.5.1.3  The parties will be obligated to agree upon terms
                              and conditions which provide for continuing
                              support for both parties' embedded customer bases
                              for the products.  Unless otherwise agreed, the
                              Terminating Party will, at its option, either take
                              over such continuing support obligations, or grant
                              the Terminated Party sufficient rights to enable
                              that party to continue to provide such support.

- --------------------------------------------------------------------------------
                                                                   PAGE 37 OF 42

<PAGE>
                    14.5.1.4  Upon the request of the Terminating Party, the
                              Terminated Party shall promptly return all
                              Confidential Information of the other party,
                              except the technology reasonably required to fully
                              exercise the Terminated Party's ongoing
                              manufacturing, support and license rights, if any,
                              in the technology of the Terminating Party.

                    14.5.1.5  Upon the request of the Terminating Party, 
                              the Terminated Party shall provide a written 
                              certification that, through the Terminated 
                              Party's best efforts and to the best of its 
                              knowledge, the Terminated Party has complied
                              with all of its obligations under subsection
                              15.5.1.4 above.

             14.6   SURVIVAL UPON TERMINATION
                    In the event that this Agreement is terminated by either
                    party either in whole or in part, for any of the reasons set
                    forth in Section 14.3, the following sections of this
                    Agreement will be deemed to survive such termination: 4, 8,
                    9, 10, 12, 16.5, 16.9 and 16.12 (including any Attachments
                    referred to therein), as well as any provisions hereof which
                    by their terms involve obligations which survive termination
                    of this Agreement.

                    Tellabs' rights and remedies pursuant to Section 5.5.2 shall
                    continue for as long as Tellabs has exclusive marketing
                    rights pursuant to Section 7 of this Agreement.  AFC's
                    rights and remedies pursuant to Section 5.5.1 shall continue
                    for as long as AFC has exclusive market rights pursuant to
                    Section 7.

15.          EXPORT RESTRICTIONS
             Each party agrees to comply with all export laws, restrictions and
             regulations of the Department of Commerce or other United States or
             foreign agency or authority, and not to export, or allow the export
             or reexport of, the technology, software or confidential
             information of a party or any direct product of the foregoing in
             violation of any such laws, restriction or regulations, or, if
             prohibited pursuant to any governmental restriction or regulation,
             to Afghanistan, the People's Republic of China or any Group Q, S,
             W, Y or Z country specified in the then current Supplement No. 1 to
             Section 770 of the U.S. Export Administration Regulations (or any
             successor supplement or regulations).

- --------------------------------------------------------------------------------
                                                                   PAGE 38 OF 42

<PAGE>

16.  GENERAL PROVISION
     16.1    RELATIONSHIP OF THE PARTIES.
             Notwithstanding any provision hereof, for all purposes of this
             Agreement each party shall be and act as an independent contractor
             and not as partner, joint venturer, or agent of the other and shall
             not bind nor attempt to bind the other to any contract.

     16.2    ASSIGNMENT.
             Neither party shall have any right or ability to assign, transfer,
             or sublicense any obligations or benefit under this Agreement
             without the written consent of the other except that either party
             may assign and transfer this Agreement and its rights and
             obligations hereunder to any third party who succeeds to
             substantially all its business, stock or assets whether by merger,
             sale, acquisition or otherwise.

     16.3    ENTIRE AGREEMENT; AMENDMENT.
             This Agreement (and all Attachments hereto) and the OEM and
             Termination Agreements constitute the entire and only agreement
             between the parties relating to the subject matter hereof, and all
             other prior negotiations, representations, understandings and
             agreements including but not limited to the Memorandum of
             Understanding dated April 3, 1996, are superseded hereby.  No
             agreements amending or supplementing the terms hereof shall be
             effective except by means of a written document signed by the duly
             authorized representatives of both parties.

     16.4    NOTICES.
             All notices, consents or approvals required by this Agreement shall
             be in writing and shall be deemed given five (5) days after being
             sent by certified or registered air mail, postage prepaid, or when
             received after being sent by facsimile (confirmed by such certified
             or registered mail) or by commercial overnight courier service with
             tracking capabilities, to the parties at the addresses set forth
             above or such other addresses as may be designated in writing by
             the respective parties pursuant to the terms of this notice
             provision.

    16.5     DISPUTES.
             16.5.1 In the event that the parties after diligent good faith
                    efforts, cannot resolve an issue, then the parties agree 
                    to convene a meeting of their Presidents an effort to 
                    reach an appropriate resolution, settlement or compromise.
                    If after diligent good faith efforts the Presidents are 
                    unable to resolve the dispute, then the parties agree to 
                    retain an impartial qualified mediator to assist in 
                    reaching a

- --------------------------------------------------------------------------------
                                                                   PAGE 39 OF 42

<PAGE>

                    mutually agreeable resolution to the dispute.  The costs 
                    of any such mediation shall be shared equally by the 
                    parties.  Except where a party reasonably believes that 
                    irreparable harm may occur and brings an action for 
                    injunctive relief, the parties shall follow the foregoing
                    dispute resolution procedures prior to commencing 
                    litigation.  In connection with any such dispute or
                    litigation, the provisions of the following paragraph will
                    apply.

             16.5.2 Prior to initiating any action hereunder (except for
                    actions for injunctive relief), the aggrieved party will 
                    provide written notice to the other party and the parties 
                    will make diligent good faith efforts to negotiate and 
                    resolve such dispute in accordance with the foregoing 
                    dispute resolution procedures.  The parties agree that 
                    in the event that it becomes necessary to initiate any 
                    action hereunder (except for actions in equity where an 
                    alternative forum is required for immediate injunctive 
                    relief), the appropriate forum shall be (a) for claims 
                    commenced by AFC, in a state or federal court located in 
                    Cook County or DuPage County, Illinois or (b) for claims 
                    commenced by Tellabs, in a state or federal court located 
                    in Sonoma County, California.

    16.6     WAIVER.
              The failure of AFC or Tellabs to enforce a right under this
              Agreement shall not act as a waiver of that right or the 
              ability to assert that right relative to the particular 
              situation involved.  The waiver by either party of a breach of 
              any provisions contained in this Agreement shall be effective 
              only if set forth in a writing signed by both parties and shall 
              in no way be construed as a waiver of any succeeding breach of 
              such provision or the waiver of the provision itself.

    16.7      HEADINGS. 
              Headings included herein are for convenience only and shall not
              be used to interpret or construe this Agreement.

    16.8      SEVERABILITY.
              If any provision of this Agreement shall be held void, invalid, 
              illegal or unenforceable, that provision shall be limited or 
              eliminated to the minimum extent necessary so that this 
              Agreement shall otherwise remain in full force and effect and 
              enforceable.

    16.9      REMEDIES; INJUNCTIVE RELIEF.
              Except as expressly provided with respect to particular 
              remedies, the rights and remedies of a party set forth herein 
              with respect to failure of

- --------------------------------------------------------------------------------
                                                                   PAGE 40 OF 42

<PAGE>

             the other party to comply with the terms of this Agreement are not
             exclusive, the exercise thereof shall not constitute an election of
             remedies and the aggrieved party shall in all events be entitled to
             seek whatever additional remedies may be available in law or in
             equity (including, without limitation, appropriate injunctive
             relief).

     16.10   AGREEMENT CONTROLS.
             The terms of this Agreement shall control over any contrary or
             inconsistent terms in any Attachment, Statement of Work or
             Specification related hereto unless this Agreement is specifically
             superseded in a written agreement signed by both parties.

     16.11   SUCCESSORS AND ASSIGNS.
             The provisions of this Agreement shall inure to the benefit of, and
             be binding upon, AFC and Tellabs and their respective successors
             and permitted assigns.

     16.12   PUBLICITY.
             The parties agree to maintain the terms of this Agreement in
             confidence.  Neither party shall directly or indirectly issue or
             permit the issuance of any publicity, news release or other public
             statement concerning this Agreement or the terms hereof without the
             prior written approval of the other party; provided, however, that
             each party may make public disclosures as required by law or
             governmental regulation with reasonable prior notice to the other
             party.  Notwithstanding the foregoing, both parties shall be free
             to disclose the nature and substance of this Agreement, as
             necessary, in connection with its annual report and SEC filings on
             Form 10-K and 10-Q.

     16.13   COMPLIANCE WITH LAWS.
             Each party further agrees to indemnify the other for any losses,
             fines, or other penalties which may be incurred or assessed,
             including reasonable attorney's fees, due to such party's failure
             to comply with the provisions of this Section.

     16.14   COUNTERPARTS.
             The Agreement may be executed in any number of counterparts, each
             of which shall be deemed to be an original, but all of which
             together shall constitute but one instrument.

- --------------------------------------------------------------------------------
                                                                   PAGE 41 of 42
<PAGE>


IN WITNESS WHEREOF, the parties have caused their duly authorized
representatives to execute this Agreement as of the date first set forth above.


ADVANCED FIBRE COMMUNICATIONS, INC.     TELLABS OPERATIONS, INC.

By:    /s/ Carl J. Grivner              By:    /s/ Brian J. Jackman
   ---------------------------             ---------------------------
Name:  Carl J. Grivner                  Name:  Brian J. Jackman
     -------------------------               -------------------------
Title: President                        Title: President
      ------------------------                ------------------------
Date:  December 30, 1996                Date:  December 23, 1996
     -------------------------               -------------------------




- --------------------------------------------------------------------------------
                                                                   PAGE 42 of 42
<PAGE>

                                      TELLABS CONTRACT NO. CON AFC 009 LIC 96 09


                                  Attachment A

                            MANUFACTURING INFORMATION


ITEMS NEEDED FOR MANUFACTURING RIGHTS
(These will be made available for any items already existing, but will not be
created solely for the purpose of this Agreement.)

1.   Bill(s) of Material
2.   Hardware Requirements/Description
3.   Software Requirements/Description
4.   Schematic(s)
5.   Fabrication Drawing(s)
6.   Mechanical Drawing(s)
7.   Test Specification(s)
8.   Test Plans/Descriptions/Procedures
9.   Test Equipment Documentation
10.  Interface Schematics from the Unit Under Test (UUT) to the Test Equipment
11.  Object Code for Testing
12.  Placement Files (ASCII Text Files)
13.  Net List (ASCII Text Files)
14.  Circuit Description/Topology File (ASCII)
15.  Qualified Sample(s)
16.  Approved Vendor List
17.  Qualified Parts List
18.  Design Engineering Support
19.  Enforceable Escalation and Product Change Procedure
20.  Training as Required




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

<PAGE>


                                  Attachment B

                      AFC CURRENT STANDARD VOLUME DISCOUNTS

UMC 1000 VOLUME DISCOUNT INFORMATION

The following discounts are available for commitment purchases of UMC 1000
equipment on an annual basis.  A signed letter of commitment or purchase order
at the beginning of the calendar year is required to qualify for these discounts
throughout a given year.

Discounts may also be given on a moving forward basis during the year (without a
volume commitment) exceeding the baseline volumes shown in the table below.

Amount in U.S. Dollars                  Discount Percentage *

$0 - $500,000                           0%
$500,001 - $1,000,000                   2%
$1,000,001 - $1,500,000                 4%
$1,500,001 - $2,000,000                 6%
$2,000,001 - $2,500,000                 8%
$2,500,001 and up                       10%

Greater discounts may be negotiated with your AFC regional Sales Manager





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

<PAGE>


                            Tellabs Volume Discounts

CABLESPAN Volume Discount Information:

The following discounts are available for commitment purchases of CABLESPAN
equipment on an annual basis.  A signed letter of commitment or purchase order
at the beginning of the calendar year is required to qualify for these discounts
throughtout a given year.

Discounts may be also given on a moving forward basis during the year (without a
volume commitment) exceeding the baseline volumes shown in the tables below.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------
           Year                        1996                                                  1997
- ------------------------------------------------------------------------------------------------------------------------
          Module     RSU/1          RSU/2       MRF/FRF/RRF       RSU/1          RSU/2         RSU/M        MRF/FRF/RRF
- ------------------------------------------------------------------------------------------------------------------------
Number of Lines      $ Net          $ Net      Disc off List      $ Net          $ Net         $ Net       Disc off List
- ------------------------------------------------------------------------------------------------------------------------
<S>                 <C>            <C>             <C>           <C>            <C>          <C>               <C>
0 - 10,000           $500           $600             0%           $480           $580         $2,640             0%
10,001 - 25,000      $490           $580             0%           $470           $560         $2,500             2%
25,001 - 50,000      $475           $550             2%           $455           $530         $2,400             5%
50,001 - 100,000     $460           $520             5%           $440           $500         $2,200            10%
100,001 - 250,000    $430           $480            10%           $410           $460         $2,200            12%
250,001 - 500,000    $410           $460            12%           $390           $440         $2,100            15%
500,001 - 1,000,000  $390           $440            15%           $380           $430         $2,000            20%
1,000,001+           $380           $430            20%           $370           $420         $2,000            25%
- ------------------------------------------------------------------------------------------------------------------------


- ------------------------------------------------------------------------------------------------------------------------------------
           Year                                    1998                                                      1999
- ------------------------------------------------------------------------------------------------------------------------------------
          Module     RSU/1          RSU/2          RSU/M       MRF/FRF/RRF       RSU/1         RSU/2         RSU/M       MRF/FRF/RRF
- ------------------------------------------------------------------------------------------------------------------------------------
Number of Lines      $ Net          $ Net          $ Net      Disc off List      $ Net         $ Net         $ Net     Disc off List
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                  <C>            <C>          <C>               <C>           <C>            <C>          <C>             <C>
0 - 10,000           $470           $560         $2,535             2%           $440           $540         $2,430           2%
10,001 - 25,000      $460           $540         $2,435             5%           $430           $520         $2,330           5%
25,001 - 50,000      $445           $510         $2,300            10%           $415           $490         $2,200          10%
50,001 - 100,000     $430           $480         $2,100            12%           $400           $460         $2,000          12%
100,001 - 250,000    $400           $440         $2,100            15%           $390           $430         $2,000          15%
250,001 - 500,000    $380           $430         $2,000            20%           $370           $420         $1,900          20%
500,001 - 1,000,000  $370           $420         $1,950            25%           $360           $410         $1,850          25%
1,000,001+           $360           $410         $1,925            25%           $350           $400         $1,800          30%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>


                                  Attachment C

                               "CAP" Customer List


ACC Corp.
Advantis
Brooks Fiber Properties, Inc.
Cablevision Lightpath, Inc.
CTEC, Inc.
Cox Fibernet
Dukenet
Eastern Telelogic Corp., Inc.
Electric Lightwave, Inc.
FiberNet USA, Inc.
GST Telecom, Inc.
Hyperion Telecommunications, Inc.
Intelcom Group, Inc. (ICG)
Intermedia Communications, Inc.
Kamine Multimedia Corp.
Linkatel Communications, Inc.
Metro Access Networks, Inc.
MFS Communications, Inc.
MWR Telecom, Inc.
NEXTLINK
Northeast Networks, Inc.
Rogers Network Services
Teleport Communications, Inc.


- -------------------------------------------------------------------------------
12/23/96

<PAGE>

                                  Attachment D


                 TELLABS "ALTERNATE PROVIDER HOLDING COMPANIES"


                                     [NONE]


- -------------------------------------------------------------------------------
12/23/96

<PAGE>

                                  Attachment E


             EXISTING AFC AGREEMENTS - AFC RESERVED MARKETING RIGHTS


AFC agrees that this Attachment E consists of only those countries,
partnerships, and/or agreements listed in the J.V. Agreement as defined in
Exhibit D thereto, "Schedule of Exceptions" and as set forth below.  AFC also
agrees to review the performance of each distributor listed below on any ongoing
basis and will use its best efforts to amend each of these agreements to allow
Tellabs to sell the full capabilities of the CABLESPAN product into the
Alternate Provider market on a non-exclusive basis.  Also, AFC will use its best
efforts to allow Tellabs to sell the full capabilities of the CABLESPAN product
into the Alternate Provider market within the PRC on a non-exclusive basis.

The following provisions from Section 6.1 and Exhibit D to the J.V. Agreement 
(as modified herein to reflect changes since the date of the J.V. Agreement) 
are incorporated herein by reference:

Section 6.1 of the J.V. Agreement:

1.   "AFC represents and warrants that none of the agreements with third parties
     referred to in Section 6.1 of Exhibit D will prohibit the sale by the
     Tellabs Partner of the Product or the J.V. Product into the Alternate
     Provider market in the territories covered by such agreements.  In
     addition, AFC agrees to use its best efforts to amend each of the
     agreements referred to in Section 6.1 of Exhibit D in order to prohibit
     sales and/or distribution of the UMC 1000 Products or its derivatives,
     including but not limited to the UMC 1000E, to the Alternate Provider
     market in such territories by such third parties.

2.   Except as provided in Section 6.1 of Exhibit D, any agreements entered into
     by AFC from and after the Effective Date of the J.V. Agreement relating to
     the sale or distribution of the UMC 1000 Products or its derivatives,
     including but not limited to the UMC 1000E, will contain a provision
     specifically prohibiting sale and/or distribution of such products to the
     Alternate Provider market.

3.   The parties acknowledge that it may be necessary to modify the definition
     of Alternate Provider as it relates to markets outside North America to
     take into account the specific market in each individual country.  Any such
     modification will be agreed by the Partners in order to most closely
     effectuate the intent of this Agreement."


- -------------------------------------------------------------------------------
12/23/96

<PAGE>

Section 6.1 to Exhibit D to J.V. Agreement:

1.   "The product noted in 1 above [a version of the UMC 1000 integrated with
     the Harris product known as the Harris 20/20 switch], if developed, would
     include exclusive rights for Harris to market this product worldwide,
     except for North America.

2.   The Company is in the process of forming a joint venture in Hong Kong with
     Elec & Eltek, a Hong Kong publicly traded company, whose purpose will be
     for the manufacture and distribution of the Company's product within the
     PRC.  Subject to certain performance milestones, this agreement provides
     the joint venture with exclusive marketing rights for the UMC 1000E within
     the PRC for an initial period of eighteen (18) months, with the right for
     twenty-four (24) month extensions. [The joint venture with Elec & Eltek was
     subsequently terminated, but AFC continues to be bound by exclusivity
     provisions which were entered into prior to the date of termination.  AFC
     agrees not to enter into any further exclusive relationships for the PRC
     and will use best efforts to amend the current agreements to prohibit sale
     and/or distribution to the Alternate Provider market.]

3.   The Company has signed an exclusive distribution agreement with PT Diavox
     Nusantara relating to the distribution, marketing and service of the
     Company's UMC 1000E in Indonesia.  AFC reserved the right to sell equipment
     into the territory to systems engineering companies, end-users or OEM's.
     The agreement requires that certain minimum performance levels be met.

4.   The Company has signed an exclusive distribution agreement with Intelcom,
     S.A. de C.V. relating to the distribution, marketing and service of the
     Company's UMC 1000E in Mexico.  The agreement requires that certain minimum
     performance levels be met.

5.   The Company entered into two License, Joint Development, Supply and
     Authorized Manufacturing Agreements with Industrial Technology Research
     Institutes ("ITRI") dated September 25, 1992 related to the joint
     development of products based upon the Company's technology.  These
     agreements provide for the transfer of certain of the Company's technology
     to ITRI.

6.   The Company entered into an exclusive distribution agreement in September
     1993 with Amruss International Marketing Corporation to market the UMC
     1000E in the Commonwealth of Independent States.  The exclusive rights
     require certain minimum performance levels to be met and allows for AFC to
     sell to systems engineering companies or end-users not headquartered in the
     Territory.


- -------------------------------------------------------------------------------
12/23/96

<PAGE>

7.   The Company entered into an exclusive distribution agreement in March 1994
     with Amtelcom KFT to market the UMC 1000E in Hungary. The exclusive rights
     require certain minimum performance levels to be met and allows for AFC to
     sell to systems engineering companies, OEM's or end-users not headquartered
     in the Territory."


- -------------------------------------------------------------------------------
12/23/96



<PAGE>

                                      Tellabs Contract No. CON AFC 008 OEM 96 08

                                    OEM AGREEMENT


This Agreement was made and executed by and between Tellabs Operations, Inc., on
behalf of itself, and its Affiliates, as hereinafter defined (collectively,
"Tellabs"), a Delaware corporation, having offices at 4951 Indiana Avenue,
Lisle, Illinois 60532-1698 USA; and Advanced Fibre Communications, Inc.
(hereinafter "AFC"), a Delaware corporation, having its principal place of
business at 1445 McDowell Blvd. No., Petaluma, CA 94975.

WHEREAS, Tellabs wishes to have AFC manufacture and deliver to Tellabs and AFC
wishes to manufacture and deliver to Tellabs, AFC's UMC 1000 Products, as
specified in the License Agreement (defined below) ("AFC Product(s)"), under
Tellabs' colors and tradedress;

WHEREAS, AFC wishes to have Tellabs manufacture and deliver to AFC and Tellabs
wishes to manufacture and deliver to AFC, the Tellabs Developments, as specified
in the License Agreement (defined below) ("Tellabs Products(s)"), under AFC's
colors and tradedress;

WHEREAS, AFC and Tellabs contemplate the repetitive purchases of their 
respective Products between them, and desire that the terms and conditions 
controlling such repetitive purchases shall be consistent, uniform, and 
agreed to by both Tellabs and AFC in advance of placing any purchase orders; 
and

WHEREAS, contemporaneous herewith, the parties have also entered into a
Termination Agreement and a License and Marking Agreement which contains certain
additional rights and obligations of the Parties as they relate to the AFC
Products and the Tellabs Products ("License Agreement").

NOW THEREFORE, in consideration of the mutual promises, covenants and conditions
contained herein, the parties agree as follows:


1.  DEFINITIONS

    1.1     Cross Reference Table

            AFC                 Preamble
            AFC Products        Preamble
            License Agreement   Preamble
            Tellabs             Preamble
            Tellabs Products    Preamble


- --------------------------------------------------------------------------------
                                                                    PAGE 1 OF 16

<PAGE>

            Term                      Section 3

    1.2     "Affiliates" shall mean an individual or entity that directly or
            indirectly controls, is controlled by, or is under common control
            with, the entity specified.  For purposes of this definition,
            "control" shall mean beneficial ownership of more than fifty
            percent (50%) of the voting stock of such entity.

    1.3     "Buyer" means Tellabs and its Affiliates in the case of the AFC
            Products and AFC and its Affiliates, in the case of the Tellabs
            Products.

    1.4     "Customer" means a customer of a Buyer and includes both end users
            and distributors.

    1.5     "Functional Specifications" means the Seller's functional
            specifications for the applicable Product.

    1.6     "Licensed Software" means the particular software programs owned by
            the Seller, or its licensors, that are provided to a Buyer under
            the terms hereof, and all documentation relating to such software.

    1.7     "Products" shall mean any products sold hereunder by Tellabs and
            AFC.  With respect to sales by AFC hereunder, "Product(s)" shall
            mean the AFC Products.  With respect to sales by Tellabs hereunder,
            "Product(s)" shall mean the Tellabs Products.

    1.8     "Seller" means AFC, in the case of the AFC Products, and Tellabs,
            in the case of the Tellabs Products.


2.  SCOPE OF WORK
    AFC hereby grants to Tellabs and its Affiliates the right to sell and
    service the AFC Products, subject to the terms and conditions set forth
    below and in the License Agreement.  AFC will, at no extra charge, use
    Tellabs' colors and tradedress for the AFC Products being sold and licensed
    to Tellabs hereunder.

    Tellabs hereby grants to AFC and its Affiliates the right to sell and
    service the Tellabs Products, subject to the terms and conditions set forth
    below and in the License Agreement.  Tellabs will, at no extra charge, use
    AFC's colors and tradedress for the Tellabs Products being sold and
    licensed to AFC hereunder.

3.  TERM
    This Agreement shall commence December 23, 1996, and shall remain in effect
    until neither party has any OEM rights under the License Agreement, unless
    sooner terminated as provided herein (hereinafter "Term").


- --------------------------------------------------------------------------------
                                                                    PAGE 2 OF 16

<PAGE>

4.  QUANTITY
    Buyer assumes no obligation hereunder to purchase any quantity of Products.
    Any forecast of quantities stated herein or on any attached Attachment, or
    otherwise provided to Seller from time to time, represents Buyer's best
    estimate of requirements for planning purposes only and shall not be
    construed as an obligation to buy any quantity of Products.

5.  PRICE AND PAYMENT TERMS
    During the Term, the prices charged to the Buyer for Products purchased
    hereunder shall be as set forth in Sections 5.2.2 or 5.4.2, as applicable,
    of the License Agreement.  Seller warrants that at all times during the
    Term, no lower price shall be offered to any of its customers which are not
    Affiliates for the same Products or for equivalent products purchased in
    similar quantities.

    Seller will invoice on shipment, and Buyer will pay for Products within
    thirty (30) days of the date of invoice.  Prices are exclusive of charges
    for freight and insurance.  Unless otherwise agreed, such charges will be
    prepaid by Seller and will appear as separate items on Seller's invoices.
    Invoices for services ordered by the Buyer and performed by Seller shall be
    due within thirty (30) days from the date of Seller's invoices.  Invoices
    for services shall be issued upon completion of such services.

6.  TAXES
    Buyer agrees to pay any sales, use or other local, state, and federal
    taxes, however designated (but exclusive of taxes based on or measured by
    Seller's net income or net worth), imposed on or based upon the provision,
    sale or use of the Products or services provided under this Agreement.
    Taxes will be separately stated on the invoice.  If an order is exempt from
    sales or use taxes, such tax will not be invoiced, provided Buyer provides
    a valid exemption certificate.

7.  PURCHASE ORDERS
    Products shall be ordered by Buyer through the issuance of purchase orders
    which shall be subject to and governed by this Agreement.  Each purchase
    order shall state the model number, Product description, quantity of
    Product ordered, desired shipment date and delivery location, method of
    shipment, unit and extended price for each Product ordered and total
    purchase price for the order.  Purchase Orders shall ship complete unless
    Buyer has authorized partial shipments.

    Seller shall place a readable packing slip on the face of all shipped
    Products, which slip shall include the following:
    a.      Order Number/Buyer's Part Number


- --------------------------------------------------------------------------------
                                                                    PAGE 3 OF 16

<PAGE>

    b.      Quantity shipped
    c.      Description of Products and/or Services
    d.      Buyer's P.O. Number


8.  CANCELLATION
    Buyer can cancel any purchase order and/or any portion of a purchase order,
    without charge, provided that Seller is advised of the cancellation at
    least ninety-one (91) days prior to the original acknowledged, scheduled
    ship date.  Buyer can postpone any purchase order and/or any portion of a
    purchase order.  Cancellation notices received less than ninety-one (91)
    days before shipment will be subject to the cancellation charges set forth
    below.  If an order has been postponed and then subsequently canceled, the
    cancellation charge shall be based on the number of days prior to the
    original scheduled ship date that notice of cancellation is received:

    Number of days prior to original    Cancellation charge as a percentage of
    scheduled ship date that notice     original purchase order amount:
    of cancellation is received by
    Seller:

    1 to 30 days                        25%
    31 to 60 days                       15%
    61 to 90 days                       10%
    91 or more days                     No Charge


9.  DELIVERY/LEAD TIME
    Seller agrees to meet all purchase order delivery date requests which
    reflect the lead times stated in Attachment A.  During the Term, the Seller
    shall attempt to reduce these lead times.  Buyer shall be entitled to
    cancel, at no charge, any purchase order which is more than five (5) days
    late.

    In addition, in the event that Seller fails to meet its agreed delivery
    dates, Buyer may request a corrective action meeting.  If Buyer so
    requests, within ten (10) calendar days of receiving such a request, Seller
    shall send the appropriate management representative from Seller's
    manufacturing plant to Buyer's designated location to discuss the problem
    and develop a corrective action plan.


10. QUALITY REQUIREMENTS

    10.1    Products shall be subject to application analysis, electrical
            characterization, and/or physical analysis.  In addition, Buyer may
            evaluate Seller for technical and processing capability through
            written and on-site quality surveys.


- --------------------------------------------------------------------------------
                                                                    PAGE 4 OF 16

<PAGE>

10.2 Seller shall make available at no additional cost to Buyer, such production
    testing facilities, labor, data, specifications, procedures and such other
    documents and assistance as necessary for Buyer or Buyer's agent to perform
    inspections.  In addition, Seller shall make available to Buyer or Buyer's
    agent at no additional charge, data obtained through Seller's normal
    routines which show the results of Seller's inspections, tests and audits
    of Products.

10.3 ON-SITE INSPECTION
    To the extent that such testing and inspection are practicable without
    interrupting Seller's normal work flow, during Seller's normal workday any
    Products or Services supplied by Seller under this Agreement may be subject
    to inspection and testing by Buyer at Seller's facility to determine
    compliance with Buyer's quality specifications, at no Seller-imposed cost
    to Buyer.

10.4 INSPECTION PROCEDURES/BUYER'S FACILITY
    Incoming Products shall be subject to predetermined inspection/testing to
    determine conformance with the purchase order as well as with all of the
    following:

    10.4.1  Seller's workmanship standards for the Products, approved in
            advance by Buyer;

    10.4.2  Seller's Functional Specifications; and

    10.4.3  Buyer's packing and shipping requirements, or as otherwise agreed
            to by the parties.

            Incoming inspection also shall identify damage that may have
            occurred in transit.  Products may be subject to laboratory
            testing, including but not limited to chemical, physical, and
            metallurgical tests as required to verify specific characteristics.
            Inspection and test reports indicating acceptance or rejection,
            inspection results and quality evaluations shall be maintained by
            Buyer in a central file and shall be used as the basis for the
            adjustments of sampling inspection, corrective action, and
            qualification status.

    10.5    PRODUCT CHANGES

            10.5.1 Seller will notify Buyer of all Product Change Notices
                   ("PCN") for Products purchased by Buyer whether within or
                   outside the applicable warranty period, prior to
                   implementing any such change.  Each PCN shall contain the
                   following information:
                        Product Change Number
                        Description Of Change
                        Reason For Change


- --------------------------------------------------------------------------------
                                                                    PAGE 5 OF 16

<PAGE>

                   Seller will provide Buyer with a single point of contact to
                   whom Buyer may direct questions regarding a particular PCN
                   in order to assess its impact on reliability,
                   specifications, and form, fit or function.  Based upon the
                   information provided, Buyer shall classify changes in the
                   Product into one of the following classes:

                   "CLASS A" CHANGE:
                   Changes are required to correct a Product deficiency such
                   as:

                   Safety or fire hazard;
                   Electrically or mechanically inoperative;
                   Operational or design defects that cause higher than
                   advertised Product failure rates or adverse Buyer reaction;
                   Product does not operate as documented in the Seller's
                   specifications, literature, as warranted by the Seller or as
                   specified in this Agreement.

                   "CLASS AC" CHANGE:
                   Changes have limited application or are conditional changes
                   to a product that affects:
                   A specific Product over time;
                   A specific subset of Products over time;
                   Specific Product combinations;
                   The use of certain options.

                   "CLASS B" CHANGE:
                   Changes that are made to incorporate improvements in design
                   resulting in better operation, improved testing and
                   maintenance, longer life, service improvements, cost
                   reductions and addition of new features.  Class B changes
                   are applied to manufactured Products and may be recommended
                   for application to existing equipment in the field.

                   "CLASS D" CHANGE:
                   Changes that incorporate minor new features and design
                   improvements that do not affect the existing functionality
                   of a Product, or other minor service improvement and test
                   capabilities not sufficiently significant to require a Class
                   B change.
                   a.   Component changes that involve physical or electrical
                        specification differences to the replaced component and
                        require product identification change are considered
                        Class D.
                   b.   Routine changes in Product documentation or technical
                        specification are documented with a Class D PCN.  The
                        Product would not change since form, fit or function of
                        the Product was not affected.


- --------------------------------------------------------------------------------
                                                                    PAGE 6 OF 16

<PAGE>

                   Buyer shall have the right to accept such changes before
                   such changes may be implemented on Products shipped to Buyer
                   and its Customers.  For Class A and AC changes Seller shall
                   replace or modify at no charge all affected Product and
                   documentation furnished hereunder.  Seller shall supply
                   relevant documentation to Buyer for all Class A and AC
                   changes.  The parties shall mutually agree on a schedule
                   which shall implement such changes for all affected
                   in-service Product locations.  Seller shall at no charge to
                   the Buyer implement all Class A and AC changes prior to
                   shipment of Product, unless otherwise directed by Buyer.

                   For Class B changes, Seller shall first notify Buyer of the
                   exact nature of the change.  Buyer shall determine if such
                   Class B change is to be implemented in Product furnished
                   hereunder and placed in service.  Should such implementation
                   be deemed necessary, Seller shall make arrangements for the
                   implementation at prices and schedules agreed prior to
                   implementation.  Documentation shall be provided by Seller
                   as specified for Class A and AC changes above.

                   For Class D changes, Seller shall notify Buyer of the nature
                   of the change and shall provide associated documentation.

                   Seller shall, at no charge to Buyer, make all A and AC
                   changes prior to shipment of Product, unless otherwise
                   directed by Buyer.

                   For Class A and AC changes which involve only an exchange of
                   components, Seller shall provide such components at no
                   charge for the Product affected and Buyer shall implement
                   such change.

            10.5.2 MANUFACTURING CHANGES
                   Seller shall notify Buyer of process changes made by Seller
                   in the manufacturing of Products to be purchased under this
                   Agreement if such changes affect the form, fit, or function
                   of Products.  If deemed necessary by Buyer, requalification
                   procedures for said Products then may be required.

    10.6    QUALITY PERFORMANCE
            Seller shall inspect and test all Products prior to their shipment
            to Buyer.  Seller agrees to maintain a 100% lot acceptance rate as
            measured by Buyer's incoming inspection.  Seller agrees to
            communicate to Buyer, any and all process or Functional
            Specification difficulties prior to Buyer's receipt of the effected
            Product.  Buyer's incoming inspection performance measure shall be
            based upon the quantity of lots accepted for all specified
            electrical, mechanical, cosmetic and solderability attributes
            versus the quantity of lots received, which


- --------------------------------------------------------------------------------
                                                                    PAGE 7 OF 16

<PAGE>

            results in a lot acceptance percentage.  Any rejects caused by
            Buyer's internal drawing or specification errors shall be excluded
            from the calculation.

    10.7    OUT-OF-BOX FAILURES
            Seller shall inspect and test all Products prior to shipment.
            Notwithstanding the foregoing, it is understood and agreed, that,
            upon receiving the Products, Buyer reserves the right to perform,
            within ten (10) business days after delivery, any test Buyer deems
            necessary to adequately demonstrate that the Products meet all of
            the Functional Specifications.  Product which does not conform to
            the Functional Specifications, or any other requirements outlined
            in this Section 10 may, at Buyer's option, be returned to Seller
            (at Seller's expense) for rework or replacement under warranty, or
            Buyer may cancel the entire purchase order or the portion thereof
            relating to the nonconforming Products at no charge to Buyer.  For
            any such returned defective Product, Buyer shall either debit
            Seller the cost of said Product plus freight, or request a refund
            for said amounts.  Rejected units returned for rework shall be
            repaired under warranty and shall have the warranty renewed upon
            redelivery to Buyer for the full warranty period.

    10.8    CORRECTIVE ACTION
            Upon Buyer's request, Seller must within forty-eight (48) hours
            following notification, provide Buyer with a written corrective
            action plan to address Seller's failure to conform with this
            Section 10.  This plan shall be reviewed by Buyer who then may
            conduct a follow-up on-site survey at Seller's facility.

11. PACKAGING AND SHIPMENT; RISK OF LOSS
    Seller shall package and ship all items in Buyer's requested manner.  All
    shipments shall be F.O.B. origin with freight prepaid.  Buyer may adjust
    the purchase order shipping destination any time up to two days prior to
    shipment.  Seller shall invoice Buyer, and Buyer shall pay, Seller's actual
    shipping charges upon presentation of evidence that Seller paid such
    charges.  The risk of loss and damage to Products shall pass to Buyer at
    the F.O.B. point.

12. WARRANTY
    Seller hereby warrants that all Products furnished hereunder shall conform
    to the Functional Specifications, and shall be free from defects in
    material, workmanship and design for a period of two (2) year(s) from date
    of receipt of shipment.  Buyer shall have the option to require Seller to
    repair or replace defective Products without charge or expense.  Repaired
    Products, including Out-of-Box Failures shall be warranted for a minimum
    period of six (6) months from completion of repairs or the remainder of the
    Product's original warranty, whichever is longer.  This warranty shall
    survive inspection, acceptance, payment and expiration or termination of
    this


- --------------------------------------------------------------------------------
                                                                    PAGE 8 OF 16

<PAGE>

     Agreement. The parties also agree to comply with the terms of Attachment B,
     with respect to their respective products, which shall be incorporated 
     herein by reference.

13.  SOFTWARE LICENSE
     13.1  The Licensed Software is subject to the terms and conditions set 
           forth in the License Agreement. Licensed Software is furnished to 
           Buyer solely for Buyer's use and the use of Buyer's Customers for 
           the use specified herein and in the License Agreement. The Licensed
           Software may not be copied, in whole or in part, except as may be 
           necessary and incidental to such uses for archival and back-up
           purposes or to replace a worn or defective copy.

     13.2  Buyer will not reverse compile, disassemble, modify or alter any 
           Licensed Software, except under the circumstances referred to in the
           License Agreement.

     13.3  Buyer may sublicense Licensed Software to its Customers under the 
           sublicense conditions contained in Sections 13.3.1 and 13.3.2 below.
           Otherwise, Buyer shall not sell, transfer, publish, disclose, display
           or otherwise make available any Licensed Software or copies 
           thereof to any third party. The following conditions do not apply 
           to firmware. Buyer may sublicense firmware without restriction 
           (except as provided in the License Agreement) provided that the 
           firmware may only be used on and with the Product with which it is 
           delivered.

           13.3.1  If Buyer sublicenses Licensed Software under this Agreement, 
                   the sublicensee must also agree to the terms of a Software 
                   License Agreement substantially in accordance with this 
                   Section 13.

           13.3.2  This right to sublicense is intended for Buyer's use for its
                   direct and indirect Customers and does not imply any further
                   right of sublicense by those Customers, except in the case 
                   of distributors which may, in turn, sublicense to their end 
                   user customers.

14.  CONTINUING AVAILABILITY OF PRODUCTS, COMPONENTS AND PRODUCT SUPPORT
     14.1  Seller Agrees to offer to Buyer during the Term hereof and for a 
           period of ten (10) years thereafter, full maintenance/repair services
           and components for the Products. Repair or replacement shall be 
           accomplished within Seller's published repair intervals or as agreed 
           upon by the parties.

     14.2  Seller shall be strictly liable for loss of or damage to Products 
           in its care, custody or control.

     14.3  If Seller fails or is unable to offer such services, Products and 
           components thereof, and if Seller is unable to obtain another source 
           of supply acceptable to


- --------------------------------------------------------------------------------
                                                                    PAGE 9 OF 16

<PAGE>
           Buyer, then such failure or inability shall be deemed noncompliant 
           with this Section 14 and, in addition to whatever other rights and 
           remedies Buyer may have at law or in equity, Seller shall be required
           to provide to Buyer, without obligation or charge, the technical 
           information and any other licenses and rights necessary to enable 
           Buyer to supply, have supplied, manufacture, or have manufactured,
           such services, Products and/or components. The above-referenced 
           technical information shall include, by example and not by 
           limitation: (1) manufacturing drawings and specifications of raw 
           materials and components comprising such parts; (2) manufacturing 
           drawings and specifications covering tooling and the operation 
           thereof; and (3) a detailed list of all commercially available 
           parts and components including the part number, name and location of
           the component's supplier, prices and functional descriptions.

     1.4.  Seller shall provide Buyer advance written notification one (1) year
           prior to entirely discontinuing the manufacture or replacement of 
           Products or component parts.

15.  NOTIFICATION PROCEDURES
     All notices, demands or consents required or permitted hereunder shall 
     be in writing and shall be delivered by overnight delivery, facsimile (with
     confirmation copy by mail), or mailed to the respective parties at the 
     addresses first set forth above or at such other address as shall have 
     been given to the other party in writing for the purposes of this clause.

     IF TO AFC:                                      IF TO TELLABS:
     Purchasing Department                           Purchasing Department
     ADVANCED FIBRE COMMUNICATIONS, INC.             TELLABS OPERATIONS, INC.
     1445 McDowell Blvd. No.                         1000 Remington Blvd. MS124
     Petaluma, CA 94975                              Bolingbrook, IL 60440

     Phone: (707) 794-7700                           Phone: (630) 969-8800
     FAX:   (707) 794-7777                           FAX:   (630) 378-5623

     COPY TO:                                        COPY TO:
     Advanced Fibre Communications, Inc.             Tellabs Operations, Inc.
     Legal Department                                Legal Department - MS 16
     1445 McDowell Blvd. No.                         4951 Indiana Avenue
     Petaluma, CA 94975                              Lisle, IL 60532
     Fax:   (707) 794-7777                           Fax:   (630) 512-7293

     Such notices and other communications shall be deemed effective upon the 
     earliest to occur of (i) actual delivery, (ii) five days after mailing, 
     addressed and postage prepaid, return receipt requested, delivery as 
     aforesaid (seven (7) days for intercontinental deliveries), (iii) one 
     (1) business day after transmission by overnight delivery (two (2)


- --------------------------------------------------------------------------------
                                                                   PAGE 10 OF 16

<PAGE>

     business days for intercontinental deliveries), or (iv) the day of 
     receipt where receipt has been confirmed.

16.  BANKRUPTCY
     In addition to all other rights or remedies provided by law, either 
     party may cancel this Agreement or any purchase orders placed hereunder, 
     in the event that (a) the other party becomes insolvent or makes a 
     general assignment for the benefit of creditors, (b) the other party 
     admits in writing its inability to pay debts as they become due, (c) a 
     trustee or receiver is appointed by any court with respect to the assets 
     or any substantial portion of the assets of the other party, or (d) an 
     action is taken by or against the other party under bankruptcy or 
     insolvency laws relating to the relief of debtors, including the Federal 
     Bankruptcy Code.

17.  FORCE MAJEURE
     Neither party to this Agreement shall be held responsible for any delay 
     or failure in performing its obligations hereunder caused by fires, 
     strikes, embargoes, requirements imposed by government regulations, civil 
     or military authorities, acts of God, or by the public enemy or other 
     similar causes, if the injured party receives prompt notice of such 
     contingency. If such contingency occurs, the party injured by the other's 
     inability to perform may elect to: (a) terminate this Agreement in whole 
     or in part as to Products not already received or work not already 
     performed, (b) suspend performance for the duration of the delaying cause, 
     or (c) resume performance under this Agreement in whole or in part once 
     the delaying cause ceases, with an option to the injured party to extend 
     the delivery date up to the length of time the contingency endured. Unless 
     written notice is given within thirty (30) days after such injured party 
     is apprised of the contingency, option 18(b) shall be deemed selected.

18.  TERMINATION
     18.1  DEFAULT
           Either party shall have the right to terminate this Agreement, in 
           whole or in part, as set forth in Section 18.4, for default by the 
           other in the performance of any substantial obligation or material 
           breach of this Agreement where such default or breach continues for a
           period of thirty (30) days after written notice thereof to the other.
           Termination of this Agreement will not affect any sublicenses granted
           prior to termination.

     18.2  BANKRUPTCY
           Either party may terminate this Agreement, in whole or in part, as 
           set forth in Section 18.4, by written notice in the event that the 
           other party makes an assignment for the benefit of creditors, or 
           admits in writing its inability to pay debts as they become due, or a
           trustee or receiver for any substantial part of its assets is 
           appointed by any court, or a proceeding is instituted under a 
           provision


- --------------------------------------------------------------------------------
                                                                   PAGE 11 OF 16

<PAGE>

           of the Federal Bankruptcy Code by or against the other party and 
           is acquiesced in or is not dismissed within ninety (90) days or 
           results in an adjudication in bankruptcy.

     18.3  TERMINATION OF LICENSE AGREEMENT
           This Agreement shall terminate under the circumstances provided in 
           the License Agreement.

     18.4  PARTIAL TERMINATION
           Notwithstanding anything to the contrary herein contained, a 
           Terminating Party entitled to terminate this Agreement pursuant to 
           Section 18.1, 18.2 or 18.3 may, at its election, only partially 
           terminate this Agreement by terminating all license rights of the 
           Terminated Party, while not terminating its own license and 
           manufacturing rights, with the effect set forth in Section 18.5 
           below. In such a case, this Agreement shall remain in partial force
           and effect, and the Terminated Party shall be required to observe all
           of its obligations to the Terminating Party for the remainder of the 
           Term of this Agreement (unless the Terminated Party terminates this
           Agreement in accordance with the terms of this Section 18). 
           Notwithstanding the foregoing, the Terminating Party may, at any time
           prior to the end of the Term, elect to terminate this Agreement in 
           its entirety, with the effect set forth in Section 18.5 below. For
           purposes of this Section 18, the party electing to terminate this
           Agreement will be deemed to be the "Terminating Party" and the other
           party shall be deemed to be the "Terminated Party."

     18.5  EFFECT OF TERMINATION
           18.5.1  In the event that this Agreement is terminated by either 
                   party, in whole or in part, as provided in this Section 18, 
                   the parties will be obligated to agree upon terms and 
                   conditions which provide for continuing support for the 
                   other party's embedded customer base for the Products. Unless
                   otherwise agreed, the Terminating Party will, at its option,
                   either take over such continuing support obligations, or 
                   grant the Terminated Party sufficient rights to enable that
                   party to continue to provide such support.

           18.5.2  In the event that this Agreement is terminated as provided 
                   in Section 18.1, 18.2, 18.3 or 18.4 the Terminating Party 
                   shall be entitled to obtain promptly from the Terminated 
                   Party (and the Terminated Party will be obligated to provide
                   to the Terminating Party), any and all design and 
                   manufacturing documentation, which is necessary or useful for
                   the design and/or manufacture of the Products, including the
                   Licensed Software and the source code therefor, being 
                   purchased by the Terminating Party under this Agreement.
                   The Terminating Party shall be entitled to use such materials
                   as well as any other materials previously disclosed under 
                   this Agreement for purposes of manufacturing, having


- --------------------------------------------------------------------------------
                                                                   PAGE 12 OF 16

<PAGE>

                   manufactured, modifying, maintaining, marketing and 
                   distributing the Products. If requested by the Terminating 
                   Party, at any time during the term hereof, the Terminated 
                   Party agrees to deposit any and all such documentation in 
                   escrow, subject to release under the terms hereof. The 
                   Terminated Party shall bear the out of pocket costs 
                   associated with the escrow. The Terminated Party will be 
                   obligated to keep the escrow updated at all times.

                   In addition, the Terminated Party agrees:
                   18.5.2.1  if requested by the Terminating Party, to 
                             continue to manufacture  Products for the 
                             Terminating Party for a one year period following 
                             the date of notice of termination; and

                   18.5.2.2  to use its best efforts to assist the Terminating 
                             Party to disengage its manufacturing operations 
                             from the Terminated Party and to cooperate with the
                             transition to a new manufacturer, in such manner 
                             as to enable the Terminating Party to continuously
                             acquire Products during a reasonable transition
                             period; and

                   18.5.2.3  to transfer to the Terminating Party or its 
                             designee any of the Terminating Party's work-in-
                             process, inventory, finished goods ordered by the
                             Terminating Party and manufacturing equipment owned
                             by the Terminating Party on terms and conditions,
                             including prices, to be mutually agreed upon by the
                             parties.

19.  LABELING AND EMISSIONS

     19.1  Irrespective of whether a specification is furnished, if Products 
           or containers to be furnished under this Agreement or under the 
           License Agreement are required to be constructed, packaged, labeled 
           or registered in a prescribed manner, the Seller shall comply with
           applicable federal, state and/or local laws. (As used herein, "local"
           shall mean where Products are manufactured.) Seller further agrees to
           indemnify Buyer for any losses, fines, or other penalties which may 
           be incurred or assessed, including reasonable attorney's fees, due 
           to Seller's failure to comply with the provisions of this Section.

     19.2  Products and components hereunder shall comply, to the extent 
           applicable, with the requirements of Subpart J of Part 15 of the 
           Federal Communications Commission's Rules and Regulations, as may be
           amended from time to time, including those sections concerning the
           labeling of such Products and components and the suppression of 
           radiation to specified levels.


- --------------------------------------------------------------------------------
                                                                   PAGE 13 OF 16

<PAGE>

           Nothing herein shall be deemed to diminish or otherwise limit 
           Seller's obligations under the "WARRANTY" section of this Agreement.

20.  GOVERNING LAW
     This Agreement shall be governed by the laws of the State of Illinois, 
     excluding its conflict of laws provisions, for matters relating to sales of
     Tellabs Products and California law, excluding its conflict of laws 
     provisions, for matters relating to sales of AFC Products.

21.  INCORPORATION BY REFERENCE
     The following Sections of the License Agreement are incorporated herein 
     by reference.

     Section 8   Warranty and Indemnification
     Section 9   Limitation of Liability
     Section 10  Confidentiality
     Section 15  Export Restrictions
     Section 16  General Provisions (except Section 16.4)

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by 
their duly authorized agents on the dates written below. This Agreement shall 
not be binding until it has been signed by both Parties.

ADVANCED FIBRE COMMUNICATIONS, INC.        TELLABS OPERATIONS, INC.


By: /s/ CARL J. GRIVNER                  By: /s/ BRIAN J. JACKMAN
   -------------------------------          ----------------------------------

Name: Carl J. Grivner                    Name: Brian J. Jackman
     -----------------------------            --------------------------------

Title: President                         Title: President
      ----------------------------             -------------------------------

Date: December 30, 1996                  Date: December 23, 1996
     -----------------------------            --------------------------------


- --------------------------------------------------------------------------------
                                                                   PAGE 14 OF 16

<PAGE>

                                                                    ATTACHMENT A

                                  LEAD TIMES

AFC Products                 30 days after receipt of order

Tellabs Products             30 days after receipt of order


- --------------------------------------------------------------------------------
                                                                   PAGE 15 OF 16

<PAGE>

                                                                    ATTACHMENT B


This Attachment B also includes the terms of Tellabs' and AFC's standard 
warranty and repair and return policies which are attached hereto and 
incorporated herein by reference. The Seller(s) will make available to Buyer 
hardware and software compatibility matrixes for the Seller's Product(s) when 
and as such matrixes are developed by Seller. In the event of a conflict 
between the terms and conditions of this Attachment B, including the standard 
policies, and the terms of the Agreement, the Agreement shall control.


                  WARRANTY AND SERVICE FOR TELLABS PRODUCTS

REPAIR COSTS

Tellabs Products may be returned freight prepaid to Tellabs for repair. AFC 
must secure prior authorization of Tellabs for the return of such Products, 
which authorization shall not be unreasonably withheld. The charge for such 
repairs shall be as stated below:

Priority                        Warranty                   No Warranty
- --------                        --------                   -----------

Normal                             $0                    50% of new board

Emergency                    $250 per module          50% of new board + $250

Customer
Requested                    $150 per module          50% of new board + $150
Priority


- --------------------------------------------------------------------------------
                                                                   PAGE 16 OF 16

<PAGE>

WARRANTY DATE CODES
- ------------------------------------------------------------------------------
          Each Tellabs hardware product is stamped with a warranty code in a 
          customer-accessible location (E.G., front panel, circuit-card 
          stiffener, etc.). This date stamp approximates the date of shipment.
          The warranty period begins on the date stamped on the product. A 
          sample date code is shown below:

                     ---------
                 ---   05-96   ---
                 |   ---------   |
                 |               |
               month            year


SOFTWARE
- ------------------------------------------------------------------------------
          Tellabs warrants that software programs will substantially conform 
          to the applicable Tellabs product specifications for a period of 
          90 days from the date of shipment, provided that the software is used
          on the hardware and with the system on which it was originally 
          installed. Tellabs also warrants that the media on which the software
          programs are distributed are free from defects in material and 
          workmanship for a period of 90 days from the date of shipment. 
          Tellabs will replace the defective media or correct substantial 
          program errors at no charge, provided that the software is returned 
          to Tellabs during the warranty period.


CONDITION AND EXCEPTIONS
- ------------------------------------------------------------------------------
          The product must be used as outlined in its applicable Tellabs 
          product specifications and it must be handled, installed, operated 
          and shipped in accordance with industry standards. Claims under this 
          warranty may be made only by the original purchaser or user. This 
          warranty does not apply to items that have a limited life expectancy,
          such as lamps and fuses. Furthermore, this warranty does not apply to 
          products modified or repaired by someone other than Tellabs or 
          products deemed as being damaged beyond repair. Classification as 
          being damaged beyond repair includes, but is not limited to, burn 
          marks, cracks or other physical damage, and damage due to catastrophic
          failure (such as lightning damage). Failure to comply with any of the
          terms of this Tellabs U.S. Warranty, Repair and Return Policy will 
          result in invalidation of the warranty.


EXCLUSION OF WARRANTIES AND LIMITATION OF LIABILITY
- ------------------------------------------------------------------------------
          NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED EXCEPT AS SET FORTH 
          HEREIN. ALL OTHER WARRANTIES, INCLUDING WARRANTIES OF 
          MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY
          EXCLUDED FROM THIS WARRANTY.

          A CUSTOMER'S EXCLUSIVE REMEDY FOR ANY CAUSE OF ACTION ARISING OUT 
          OF ANY DEFECTIVE PRODUCT IS LIMITED TO REPAIR OR REPLACEMENT OF THE
          PRODUCT DURING THE WARRANTY PERIOD, AT TELLABS' OPTION. UNDER NO
          CIRCUMSTANCES WILL TELLABS BE LIABLE FOR ANY INDIRECT, SPECIAL,
          INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSS, INCLUDING, BUT NOT
          LIMITED TO, LOSS OF PROFITS, LOSS OF USE OR LOSS OF DATA, WHETHER 
          CAUSED BY BREACH OF CONTRACT, NEGLIGENCE, OR OTHERWISE. UNDER NO 
          CIRCUMSTANCES WILL TELLABS' LIABILITY UNDER THIS WARRANTY POLICY 
          EXCEED THE PURCHASE PRICE OR LICENSE FEE PAID BY A CUSTOMER FOR THE
          PRODUCT.


TELLABS PRODUCT SCREENING SERVICE
- ------------------------------------------------------------------------------
          For customers with product in inventory with uncertain operational 
          status, Tellabs offers a product screening service. During the 
          product screening, a pass/fail test is performed on your product to 
          determine if the product meets its applicable Tellabs product 
          specifications. Please contact the Tellabs Product Services 
          Department at 630.378.8800 for further details.


                                 Page 16 - 1
<PAGE>

PROCEDURE FOR REPAIR AND RETURN
- -------------------------------------------------------------------------------
          When a product requires repair service, contact the Tellabs Product 
          Services Department at 630.378.8800 and request a Material Return 
          Authorization (MRA) number. A service representative will request 
          your company's name and address; the product's model number, issue 
          number and warranty date code; and, the purchase order number for the
          return transaction. The service representative will then assign an 
          MRA number that identifies your particular transaction. After you 
          obtain the MRA number, write the number clearly on the outside of the
          carton being returned. Enclose an explanation of the malfunction, 
          your company name and address, the name of a person to contact for 
          further information and the  purchase order number for the 
          transaction. Then send the product, freight prepaid, to:

              Tellabs Operations, Inc.
              4951 Indiana Avenue
              Lisle, Illinois 60532
              Attn: Product Services, MRA No.______

          Product returned without an MRA number may be subject to return to 
          the customer without repair.

          Tellabs will inspect the returned product. If the product is in 
          warranty and found defective, Tellabs will, at its option, either 
          repair or replace the product. Return freight will be paid by 
          Tellabs. Please allow 15 business days for standard repair and return
          warranty service. Out-of-warranty products will be repaired rather
          than replaced (see Costs section below for applicable charges).

          If the product is found to be damaged beyond repair, a service 
          representative will contact you and offer a refurbished replacement,
          when available, at 65 percent of the current list price in the 
          latest Tellabs published price list for that equipment.

          Additionally, Tellabs offers a next day, expedited repair service. 
          If you require expedited repair, it should be indicated at the time
          the MRA is requested (see Costs section below for applicable 
          charges).


EXTENT OF REPAIRS
- ------------------------------------------------------------------------------
          All products will be repaired to meet the applicable Tellabs product
          specifications established for the particular product returned.

          The warranty period for any repaired product is either the 
          remainder of the products' original warranty period or a period of
          six (6) months from the date of repair, whichever is longer. Out-of-
          warranty products that are repaired will receive a new warranty 
          period covering the repairs for a period of six (6) months from the 
          date of repair.


COSTS
- ------------------------------------------------------------------------------
          The charge for retesting, repairing and revision-updating a module 
          is based upon the module's current list price in the latest Tellabs
          published price list. Listed below is the current repair pricing
          formula for out-of-warranty products:

          Repair Charge = 15 percent of the current published list price + $50

          Products that have been modified or repaired by someone other than 
          Tellabs or that, in Tellabs' opinion, are deemed damaged beyond 
          repair will be returned to the customer with a $30 handling charge 
          and the warranty voided. Subject to availability, the customer may 
          elect to purchase an equivalent refurbished product at 65 percent 
          of the current list price in the latest Tellabs published price list.
          In this case, the $30 handling charge will be waived.

          Customers requiring next day expedited repairs will also be 
          assessed a $75 express fee for each product, in addition to the 
          applicable repair charge.
          
          NOTE: IF A PRODUCT IS SUBMITTED FOR REPAIR UNDER WARRANTY AND IS 
          FOUND BY TELLABS TO MEET THE APPLICABLE TELLABS PRODUCT 
          SPECIFICATIONS (I.E., "NO DEFECT FOUND"), A RETEST CHARGE OF 15 
          PERCENT OF THE CURRENT LIST PRICE IN THE LATEST TELLABS PUBLISHED 
          PRICE LIST OF THE PRODUCT, UP TO A MAXIMUM OF $100 WILL BE INVOICED.


                                 Page 16 - 2
<PAGE>

TELLABS EXPEDITED REPLACEMENT SERVICE
- ------------------------------------------------------------------------------
          The Tellabs Expedited Replacement Service is designed to provide 
          reliable shipment of an exact replacement, if available in stock, 
          anywhere within the United States. When a time-critical service 
          outage exists, contact our Corporate Customer Service office at 
          800.443.5555, where our product specialists are available 24 hours 
          a day, seven days a week to provide technical assistance.

          If product replacement is required, the product specialist will 
          arrange for the replacement of the defective equipment via the 
          shipment modes shown below. This service offers two (2) levels 
          of express shipment at an applicable service charge:

          OVERNIGHT SERVICE: $90 per module for overnight shipment of a exact 
          replacement (if replacement is available from stock) anywhere in 
          the United States.

          COUNTER-TO-COUNTER SERVICE: Price is based upon destination plus 10 
          percent of the current list price. Same-day shipment will be made 
          of an exact replacement (if replacement is available from stock) 
          anywhere in the United States.

          THE OVERNIGHT SERVICE FEE WILL BE WAIVED IF THE EXPEDITED 
          REPLACEMENT REQUEST IS WITHIN 90 DAYS OF A DEFECTIVE PRODUCT'S 
          WARRANTY DATE CODE.

          To expedite your replacement request, the product specialist will 
          also request your company's name and address; the product's model,
          issue numbers and warranty date code; and, the purchase order 
          number for the replacement transaction. Tellabs will ship the 
          replacement via the shipment mode of the customer's choice. After 
          the replacement equipment is shipped, an invoice will be issued 
          for the current list price in the latest Tellabs published price 
          list for the equipment, plus an overnight delivery charge and an out-
          of-warranty charge, if applicable.

          After receiving the replacement, the customer has 30 days to return 
          the defective product to Tellabs Product Services Department using 
          the Material Return Authorization (MRA) number listed on the 
          packing slip issued with the replacement. If the defective 
          equipment is received within 30 days, credit will be issued for the 
          product's list price, leaving a balance due on the replacement 
          invoice reflecting the overnight delivery charges and an 
          out-of-warranty charge, if applicable.

          Defective equipment returns RECEIVED AFTER 30 DAYS are also subject 
          to a restocking charge. The following restocking charges apply:
          1 to 6 months:  25 percent of current list price in the latest 
          Tellabs published price list.
          7 to 12 months: 40 percent of current list price in the latest 
          Tellabs published price list.

          All invoices are due and payable within 30 days after the date of 
          invoice.

          Any product(s) returned 12 months or more after the initial 30 days 
          WILL NOT BE ACCEPTED FOR CREDIT.

          NOTE: IF A MODULE IS MODIFIED BY ANYONE OTHER THAN TELLABS, OR IS 
          DEEMED DAMAGED BEYOND REPAIR, TELLABS RESERVES THE RIGHT TO CHARGE 
          THE CUSTOMER FOR THE REPLACEMENT PART AT THE CURRENT LIST PRICE IN 
          THE TELLABS PUBLISHED PRICE LIST. MODIFIED PRODUCTS (DESIGNATED BY 
          "M" AND A NUMBER) AND MANUFACTURE-DISCONTINUED (MD) PRODUCTS ARE 
          EXPRESSLY EXCLUDED FORM THE TELLABS EXPEDITED REPLACEMENT SERVICE.

          Tellabs Operations, Inc.
          4951 Indiana Avenue
          Lisle, Illinois 60532
          630.378.8800
          Fax: 630.512.7097

          Tellabs, [logo], CROSSNET, Dataplexer. 331 Xplexer, T-Coder, TITAN 
          and Your Networking Partner are registered U.S. trademarks of Tellabs
          Operations, Inc.

          CABLESPAN, Datacell and Minicell are trademarks of Tellabs 
          Operations, Inc.

          Martis and DXX are Finnish trademarks of MARTIS Oy, a subsidiary of 
          Tellabs, Inc.                                               74-0064 B


                                 Page 16 - 3

<PAGE>

[LOGO]

WARRANTY

Advanced Fibre Communication ("AFC") warrants that its products ("Products") 
are free from defects in design, workmanship, materials and title as provided 
herein. This warranty shall survive inspection, acceptance, and payment for a 
period of two (2) years after the date the Product is shipped from AFC (or 
greater if an extended warranty has been purchased), provided that said 
Product has not been misused, improperly operated or subjected to repairs or 
modifications by any party other than AFC without AFC's written consent, or 
damaged by fire, explosion, electrical power failure or acts of God.  
Extended warranty plans are also available at an additional cost.

Except as expressly provided herein, AFC makes no warranty, express or implied,
with respect to its products or services including, without limitation,
warranties of merchantability or fitness for a particular purpose.

Buyer's sole remedy with respect to breach of any warranties shall be, at 
AFC's option, to repair or replace the defective Product, or for AFC to 
furnish a credit for such defective Product, or for AFC to furnish a credit 
for such defective Product equal to the purchase price.  Buyer shall, upon 
evidence of a particular Product's breach of warranty, return said Product to 
AFC, at Buyer's risk and expense.  AFC shall examine the Product and repair 
or replace the Product within a reasonable time, returning the Product to 
Buyer at Buyer cost and expense, or furnish Buyer credit equal to the 
purchase price for such defective Product.

If AFC's examination discloses misuse, improper operation, unauthorized repair
or modification of the Product by Buyer or its agents, then Buyer shall pay AFC
the current charges for repair or replacement for said Product.  Repairs or
replacements carried out by AFC shall be free from defects in design,
workmanship, materials and title for the period of said Product's original
warranty, or for 90 days from the date of shipment of the repaired or replaced
Product, whichever occurs later.

Consumable materials such as fuses, batteries, floppy disks and lamps are not 
warranted by AFC in any way.  Equipment manufactured by third parties, such 
as computers and computer peripherals carry only the manufacturer's original 
warranty and are not warranted in any way by AFC.  Components of AFC's 
Product purchased from AFC carry no warranty, express or implied.

The remedy set forth above is Buyer's exclusive and sole remedy and the 
entire extent of AFC's liability for any claims Buyer may have against AFC 
regarding AFC products.  AFC shall have no liability with respect to any 
product or service, whether in contract, negligence, strict liability, or any 
other legal or equitable theory, for any amount in excess of buyer's payments 
to AFC for such product or service or any incidental, consequential or 
special damages or lost profits or cost of procurement of substitute goods, 
services or technology. There are no warranties which extend beyond the 
description of the face hereof.

[LETTERHEAD]

<PAGE>

18.4. REPAIR & RETURN POLICY

Advanced Fibre Communications has designed a policy to help quickly and
efficiently repair and return quality equipment to our customers.  All failed
boards which are processed through the Petaluma facility are repaired and
revised to the most current revision level possible.  Equipment purchased from
Advanced Fibre Communications is covered under various warranty plans.  Check
with your system administrator to determine the type of warranty plan and the
length of the warranty purchased for your system.


Equipment failure occurring in the field must be reported to the AFC order
administrator in Petaluma.  The order administrator can be contacted during
normal working hours (8-5), pacific coast time at 1-707-794-7700.   If an
emergency failure has occurred, call the 24 hour Technical Assistance Center at
1-800-500-7722.  The order administrator will assign an RMA number to each
failed board.  The RMA number is a unique number and should be recorded in your
files as it is the key to identifying a failed board throughout the repair and
return process.  You will be able to contact Order Administration at any time to
identify the repair status and expected turn around time of your returned
boards.  Failed boards should be shipped to:


    Advanced Fibre Communications
    1445 McDowell Boulevard North, Suite B
    Petaluma, California 94954
    Attention: Repair Service Department
    RMA #__________________

There are three levels of priority which can be assigned to your failure.  The
failure can be classified as either normal, emergency, or customer requested
priority upon your request.  Fees for these services will depend upon the
current warranty status of the returned boards.  The turn around time for boards
will vary depending upon local customs departments and methods of shipment,
however, AFC will guarantee the time periods listed below once the boards reach
our facility.

For boards which are classified as normal failures, we will repair the board 
and ship it back within 15 calendar days.  Shipping arrangements will be made 
via the most economical means possible.

If a failure is traffic affecting, and no spares are available, the failure will
be classified as an emergency.  In emergency cases, a reconditioned board of the
same revision or better will be shipped via a priority one service within 24
hours of notification to AFC.  If there are no reconditioned boards available, a
new board will be shipped.

                                        18-15

<PAGE>


UMC 100A Ordering Guide
Marketing Document
6-101, Issue 2.0


18.4.  REPAIR & RETURN POLICY

AFC also offers a 72 hour turn around of failed boards.  This service is 
classified as a customer requested priority and guarantees return of a board 
within 3 business days after receipt of a failed board.  A schedule of costs 
for the various priority classifications is given below.

                                  --------------------------------
                                  Warranty            No Warranty
                   -----------------------------------------------
                   Normal            $0               50% of new
                                                      board
                   -----------------------------------------------
                   Emergency        $250              50% of new
                                                      board + $250
                   -----------------------------------------------
                   Customer
                   Requested        $150              50% of new
                   Priority                           board + $150
                   -----------------------------------------------


To help facilitate the repair and return process, the order administrator will
request that a Failure Report Tag be completed for each failed board.  If
failure tags are not available, a copy of the tag can be found in the
Installation, Maintenance and Test Manual of the UMC documentation set.  The
failure tag must be included with the failed module and the RMA number must be
marked on the outside of the shipping container.  All charges for shipping to
AFC's facility will be the responsibility of the customer.  AFC is responsible
for shipping costs when returning boards to the field.


                                        18-16



<PAGE>

                                                                   EXHIBIT 11.1

                     ADVANCED FIBRE COMMUNICATIONS, INC.
          SCHEDULE RE: COMPUTATION OF PRO FORMA NET INCOME PER SHARE
                    (In thousands, except per share data)


                                           1995                    1996
                                 ----------------------- -----------------------
                                                FULLY                   FULLY
                                   PRIMARY     DILUTED     PRIMARY     DILUTED
                                 ----------- ----------- ----------- -----------

Net income                           $ 2,341     $ 2,341    $ 7,237      $ 7,237
                                 ----------- ----------- ----------- -----------
Weighted average common shares
   outstanding                         4,373       4,373     26,070       26,070
Redeemable convertible preferred
   stock, on an as-if converted
   basis                              17,448      17,448        -           -
Common stock equivalents-stock
   options and warrants                3,521       4,003       7,954       8,296
Staff Accounting Bulletin No. 83
   issuances and grants:
      Stock options                    1,070       1,070         202         203
      Redeemable convertible
         preferred stock                 917         917          56          56
                                 ----------- ----------- ----------- -----------
Weighted average shares used in
   per share computations             27,329      27,811      34,282      34,625
                                 ----------- ----------- ----------- -----------

Pro forma net income per share         $0.09       $0.08       $0.21       $0.21
                                 ----------- ----------- ----------- -----------
                                 ----------- ----------- ----------- -----------




                                 




<PAGE>
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
The Board of Directors
Advanced Fibre Communications, Inc.:
 
    We  consent to the use of our report included herein and to the reference to
our firm under the headings "Selected Consolidated Financial Data" and "Experts"
in the Prospectus.
 
                                          KPMG Peat Marwick LLP
 
San Francisco, California
January 23, 1997

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          24,942
<SECURITIES>                                    83,488
<RECEIVABLES>                                   32,779
<ALLOWANCES>                                         0
<INVENTORY>                                     17,349
<CURRENT-ASSETS>                               162,189
<PP&E>                                          11,080
<DEPRECIATION>                                   1,491
<TOTAL-ASSETS>                                 175,679
<CURRENT-LIABILITIES>                           16,851
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           326
<OTHER-SE>                                     157,697
<TOTAL-LIABILITY-AND-EQUITY>                   175,679
<SALES>                                        128,941
<TOTAL-REVENUES>                               130,193
<CGS>                                           69,628
<TOTAL-COSTS>                                   73,950
<OTHER-EXPENSES>                                53,015
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               (855)
<INCOME-PRETAX>                                  4,083
<INCOME-TAX>                                   (3,154)
<INCOME-CONTINUING>                              7,237
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     7,237
<EPS-PRIMARY>                                     0.21
<EPS-DILUTED>                                     0.21
        

</TABLE>


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