ADVANCED FIBRE COMMUNICATIONS INC
S-1/A, 1996-09-26
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 26, 1996
    
                                                       REGISTRATION NO. 333-8921
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
   
                                AMENDMENT NO. 3
                                       TO
                                    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.                              MARK A. BERTELSEN, ESQ.
              KEITH M. ROBERTS, ESQ.                             KENNETH M. SIEGEL, ESQ.
         BROBECK, PHLEGER & HARRISON LLP                            DAVID S. KIM, ESQ.
                    ONE MARKET                              WILSON, SONSINI, GOODRICH & ROSATI
                SPEAR STREET TOWER                               PROFESSIONAL CORPORATION
             SAN FRANCISCO, CA 94105                                650 PAGE MILL ROAD
                  (415) 442-0900                                 PALO ALTO, CA 94304-1050
                                                                      (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. / /
                              -------------------
 
   
    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>
                                    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.............................  $     23,595
NASD filing fee.................................................................         7,343
Nasdaq National Market listing fee..............................................        50,000
Printing and engraving expenses.................................................       225,000
Legal fees and expenses.........................................................       250,000
Accounting fees and expenses....................................................       175,000
Blue sky fees and expenses......................................................        10,000
Transfer agent and registrar fees...............................................        15,000
Director and officer insurance premiums.........................................       340,000
Miscellaneous expenses..........................................................       104,062
                                                                                  ------------
      Total.....................................................................  $  1,200,000
                                                                                  ------------
                                                                                  ------------
</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 September  1993, 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 September 1993,  the Registrant has granted  stock options to  its
employees under its stock option plans covering an aggregate of 3,543,198 shares
of  the Registrant's  Common Stock,  at exercise  prices ranging  from $0.025 to
$13.60 per share.  The Registrant  has issued  404,644 shares  upon exercise  of
these stock options.
    
 
   
    (ii)  In  October  1993, the  Registrant  issued  and sold  an  aggregate of
2,040,820 shares of Series B Preferred Stock (convertible into 2,237,878  shares
of Common Stock) at $2.50 per share to 26 investors, and warrants to purchase an
aggregate  of  347,636  shares  of  Common Stock  at  $0.125  per  share  to six
investors.
    
 
   
   (iii) 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.
    
 
   
    (iv) 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.
    
 
    (v) 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.
 
   
    (vi)  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.
    
 
   
   (vii) 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.
    
 
   
  (viii) Between September  1993 and July  1996, the Registrant  has issued  and
sold 224,284 shares of Common Stock upon exercise of warrants to 11 individuals.
    
 
   
    (ix)  Between May  1994 and  July 1996, the  Registrant has  issued and sold
1,264,900 shares of Common Stock upon exercise of warrants to 10 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.**
      3.1  Second Amended and Restated Certificate of Incorporation of the Registrant.**
      3.2  Third Amended and Restated Certificate of Incorporation of the Registrant.**
      3.3  Form of Fourth Amended and Restated Certificate of Incorporation of the Registrant.**
      3.4  Bylaws of the Registrant.**
      3.5  Form of 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.**+
</TABLE>
    
 
                                      II-3
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
    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.**
    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.**
     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).**
     23.3  Consent of Grant Thornton LLP, Independent Certified Public Accountants.**
     24.1  Power of Attorney (see page II-6).**
</TABLE>
    
 
- ---------
   
**  Previously filed.
    
 
+    Portions  of this  Exhibit have  been deleted  pursuant to  a  Confidential
    Treatment Request filed with the Commission.
 
    (b) Financial Statement Schedules
 
        Not applicable.
 
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
 
                                      II-4
<PAGE>
   
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 AMENDMENT NO. 3  TO REGISTRATION STATEMENT TO BE SIGNED  ON
ITS  BEHALF  BY  THE UNDERSIGNED,  THEREUNTO  DULY  AUTHORIZED, IN  THE  CITY OF
PETALUMA, STATE OF CALIFORNIA ON THIS 26TH DAY OF SEPTEMBER, 1996.
    
 
                                       ADVANCED FIBRE COMMUNICATIONS, INC.
 
   
                                       By           /s/ DAN E. STEIMLE
    
                                          --------------------------------------
   
                                                      Dan E. Steimle
                                             VICE PRESIDENT, CHIEF FINANCIAL
                                                         OFFICER,
                                                 TREASURER AND SECRETARY
    
 
   
    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS AMENDMENT
NO. 3 TO REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED:
    
 
   
<TABLE>
<CAPTION>
               SIGNATURE                                         TITLE                                    DATE
- ---------------------------------------  ------------------------------------------------------  ----------------------
 
<S>                                      <C>                                                     <C>
           /s/ DONALD GREEN*
    -------------------------------      Chairman of the Board and Chief Executive Officer         September 26, 1996
             Donald Green                 (principal executive officer)
 
         /s/ CARL J. GRIVNER*
    -------------------------------      President, Chief Operating Officer and Director           September 26, 1996
            Carl J. Grivner
 
          /s/ DAN E. STEIMLE             Vice President, Chief Financial Officer, Treasurer and
    -------------------------------       Secretary (principal financial and accounting            September 26, 1996
            Dan E. Steimle                officer)
 
           /s/ B.J. CASSIN*
    -------------------------------      Director                                                  September 26, 1996
              B.J. Cassin
 
      /s/ CLIFFORD H. HIGGERSON*
    -------------------------------      Director                                                  September 26, 1996
         Clifford H. Higgerson
 
          /s/ BRIAN JACKMAN*
    -------------------------------      Director                                                  September 26, 1996
             Brian Jackman
 
            /s/ DAN RASDAL*
    -------------------------------      Director                                                  September 26, 1996
              Dan Rasdal
 
      *By:     /s/ DAN E. STEIMLE
      --------------------------
            Dan E. Steimle
           ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-6
<PAGE>
                                 EXHIBIT INDEX
 
   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
 
      1.1  Form of Underwriting Agreement.**
      3.1  Second Amended and Restated Certificate of Incorporation of the Registrant.**
      3.2  Third Amended and Restated Certificate of Incorporation of the Registrant.**
      3.3  Form of Fourth Amended and Restated Certificate of Incorporation of the Registrant.**
      3.4  Bylaws of the Registrant.**
      3.5  Form of 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.**
     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).**
     23.3  Consent of Grant Thornton LLP, Independent Certified Public Accountants.**
     24.1  Power of Attorney (see page II-6).**
</TABLE>
    
 
- ---------
   
**  Previously filed.
    
 
+     Portions  of this  Exhibit have  been deleted  pursuant to  a Confidential
    Treatment Request filed with the Commission.

<PAGE>


                                       TELLABS CONTRACT NO.: JDL940399LEG-00

                       JOINT VENTURE AND PARTNERSHIP AGREEMENT



This Joint Venture and Partnership Agreement ("Agreement") is entered into as of
April 11, 1994 by and between Advanced Fibre Communications, a California
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, both Tellabs and AFC are in the business of manufacturing, marketing
and distributing telecommunications products throughout the world;

WHEREAS, Tellabs, either directly or through a wholly-owned subsidiary, and AFC,
either directly or through a wholly-owned subsidiary, wish to enter into a joint
venture in the form of a general partnership to design, develop, manufacture and
distribute a product line and its derivatives, which will allow telephone
services to be provided over existing cable television ("CATV") installed 
coaxial systems as well as other transmission media.

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


                                      SECTION 1

                                     DEFINITIONS

1.1      AFFILIATE
         The term "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, or more than 50% interest in the income of, such entity.

1.2      ALTERNATE PROVIDERS
         The term "Alternate Providers" shall mean competitive access
         providers, alternate local transport service providers, alternate
         local access carriers, multiple system operators, or any company,
         subsidiary, partnership, co-venture, or other entity providing
         alternate telephony services.  "Alternate Provider" does not include
         wireless service providers except those affiliated with an Alternate
         Provider entity ("Wireless Affiliates").

                                                                    Page 1 of 30

- ----------------------
[*] INDICATES CONFIDENTIAL TREATMENT REQUESTED


<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

1.3      BUSINESS PLAN
         The term, "Business Plan" shall mean the business plan approved by the
         Partners' Committee pursuant to Section 2.8 hereof including but not
         limited to revenue and income projections, cash flow plans,
         manufacturing plans, and high-level development plans.  The Business
         Plan shall detail the Company's activities during the development and
         distribution of the Product and shall contain such other matters as
         the Partners' Committee shall determine.

1.4      DESIGN COMMITTEE
         The term "Design Committee" shall mean a Design Committee established
         pursuant to Section 3.2 hereof.


1.5      DISTRIBUTOR
         The term "Distributor" shall mean any person or entity who has been
         granted the right to distribute 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 6.1.

1.6      EFFECTIVE DATE
         The term "Effective Date" shall mean the date first set forth above in
         this Agreement.

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

1.8      ENHANCEMENTS
         The term "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      ENGINEERING DESIGN PACKAGE
         The term "Engineering Design Package" shall mean the set of
         documentation for the design of the J.V. Product, and shall include,
         but may not be limited to, engineering design specifications,
         engineering test specifications, costed bill of materials, parts list,
         board lay-outs and schematics.  The Engineering Design Package shall
         be designed to comply with the design standards set forth in the MRD,
         and shall include, at a minimum, the same level and types of
         documentation developed by AFC for the UMC 1000.

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


                                                                    Page 2 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

1.11     IMPROVEMENTS
         The term "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     INITIAL DESIGN AND DEVELOPMENT PHASE
         The term "Initial Design and Development Phase" shall mean the period
         of time beginning on the Effective Date and ending on the date that
         the J.V. Product first becomes generally available, which is defined
         as the validation review (VR) date.

1.13     J.V. COMPANY
         The term "J.V. Company" shall mean the general partnership formed by
         the Partners pursuant to the terms of this Agreement.

1.14     J.V. PRODUCT(S)
         The term "J.V. Product(s)" shall mean product components (both
         Hardware and Software) and their derivatives to be developed by the
         J.V. Company.  Without limiting the generality of the foregoing, J.V.
         Products do not include UMC 1000 System Components with or without
         minor modifications as referred to in Section 1.32.


1.15     J.V. PRODUCT TECHNOLOGY
         The term "J.V. Product Technology" shall mean all technical
         information and know-how developed by or for the J.V. Company and
         embodied in the J.V. Product(s) including without limitation, Software
         related thereto, together with all patents and applications for
         patents throughout the world, all copyrights, all trade secrets, and
         all other forms of intellectual property relating thereto.  Unless
         otherwise agreed in writing by the Partners, the J.V. Product
         Technology does not include any other AFC or Tellabs technology
         including but not limited to the UMC 1000 Technology developed by AFC.

1.16     LICENSED ENHANCEMENTS
         The term "Licensed Enhancements" shall mean Enhancements to the UMC
         1000 which are licensed to the J.V. Company hereunder.

1.17     MANUFACTURING RELEASE PACKAGE
         The term "Manufacturing Release Package" shall mean the set of
         documentation developed by or for the J.V. Company necessary and
         sufficient to manufacture the J.V. Product, and shall include, but may
         not be limited to, in-process manufacturing documentation and
         manufacturing test specifications.  The Manufacturing Release Package
         shall be designed to comply with the manufacturability standards set
         forth in the MRD, and shall include, at a minimum, the same level and
         types of documentation used by other joint venture manufacturers of
         the UMC 1000.


                                                                    Page 3 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

1.18     MARKET STUDY
         The term "Market Study" shall mean that market information which was
         developed by Tellabs prior to the Effective Date relating to the J.V.
         Product(s).

1.19     MRD
         The term "MRD" shall mean the Marketing Requirements Document to be
         developed pursuant to Section 3.1 hereof, as the same may be amended
         from time to time.  Deliverables to be specified in the MRD shall
         include, at a minimum, an Engineering Design Package and a
         Manufacturing Release Package.

1.20     NET CUMULATIVE REVENUE
         The term "Net Cumulative Revenue" shall mean the aggregate Net Selling
         Price for all UMC 1000 System Components sold by Tellabs or its
         Affiliates.

1.21     NET SELLING PRICE
         The term "Net Selling Price" shall mean invoice price less credits,
         returns, shipping costs, taxes and discounts actually paid or allowed
         but not less fees or commissions to agents, representatives or others,
         and, where applicable, shall include license fees.

1.22     PARTNER(S)
         The term "Partner" or "Partners" shall mean either Tellabs or AFC, or
         a wholly-owned subsidiary designated by either or both of them.

1.23     PRE-EXISTING PRODUCT
         The term "Pre-existing Product" shall mean the UMC 1000 product
         developed by or for AFC as described in Exhibit A hereto.  Exhibit A
         will be agreed upon by the Partners' Committee and attached to this
         Agreement by April 29, 1994, as provided in Section 3.1 hereof.  The
         Pre-existing Product shall also include those Enhancements listed on
         Exhibit A, which AFC hereby agrees to develop.

1.24     PRE-EXISTING TECHNOLOGY
         The term "Pre-existing Technology" shall mean all technical
         information and know-how developed by or for AFC and embodied in the
         Pre-existing Product (as defined in Section 1.23) whether developed
         prior to or after the date thereof, including but not limited to
         Software, together with all patents and applications for patents
         throughout the world, all copyrights, all trade secrets, and all other
         forms of intellectual property relating thereto.  Without limiting the
         generality of the foregoing, AFC shall be obligated to ensure that the
         Pre-existing Technology includes documentation substantially
         equivalent to that described in Sections 1.9 and 1.17, whether
         available directly from AFC or a third party such as the manufacturer
         thereof.


                                                                    Page 4 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

1.25     PRODUCT(S)
         The term "Product(s)" shall mean the complete system level product
         (both Hardware and Software) and its derivatives sold pursuant to this
         Agreement and shall include both J.V. Product(s) and UMC 1000 System
         Components.  The parties intend that the Product(s) will allow
         telephone services to be provided over existing CATV installed coaxial
         systems as well as other transmission media.

1.26     PRODUCT SUPPORT PLAN
         The term "Product Support Plan" shall mean the product support plan
         referred to in Section 7.2, as such plan may be amended from time to
         time.

1.27     SOFTWARE
         The term "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.

1.28     TERM
         The term "Term" shall mean the term of this Agreement as set forth in
         Section 11.

1.29     TRANSFER
         The term "Transfer" shall mean to sell, transfer or otherwise assign.

1.30     UMC 1000
         The term "UMC 1000" shall mean the AFC product which is currently
         called the UMC 1000, including any Improvements and Licensed
         Enhancements embodied therein during the Term of this Agreement.

1.31     UMC 1000 TECHNOLOGY
         The term "UMC 1000 Technology" shall mean all technical information
         and know-how owned by, licensed to, or developed by or for AFC
         relating to the UMC 1000, including any Improvements and Licensed
         Enhancements thereto developed during the Term hereof and offered to
         and accepted by the J.V. Company, including without limitation,
         Software related thereto, together with all patents and applications
         for patent throughout the world, all copyrights, all trade secrets,
         and all other forms of intellectual property relating thereto.
         Without limiting the generality of the foregoing, the UMC Technology
         shall include documentation substantially equivalent to that described
         in Sections 1.9 and 1.17, whether available directly from AFC or a
         third party such as the manufacturer thereof.


                                                                    Page 5 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

1.32     UMC 1000 SYSTEM COMPONENTS
         The term "UMC 1000 System Components" shall mean the modules, Software
         and system assemblies and subassemblies which are substantially
         identical to those in the UMC 1000, except for any minor
         modifications, including but not limited to private labeling and
         software modifications which do not substantially change or supplement
         their functionality.




                                      SECTION 2

              FORMATION, ORGANIZATION AND MANAGEMENT OF THE J.V. COMPANY

2.1      FORMATION
         Effective as of the Effective Date, the Partners hereby cause the J.V.
         Company to be formed as a partnership.  Each Partner shall own a 50%
         interest in the J.V.  Company.

2.2      CONTRIBUTIONS
         The Partners agree to contribute the following consideration to the
         J.V. Company:

         a.   Within [*] days of the Effective Date, Tellabs (or a wholly-
              owned subsidiary which has been designated as the Partner) will 
              contribute [*] the J.V. Company, [*] of which will
              be in the form of a cash contribution and the balance of which 
              will be [*].

         b.   Within [*] days of the Effective Date and subject to the
              terms of the rights set forth in Section 4.1, AFC will make the
              Pre-existing Technology (except those Licensed Enhancements not
              yet available) available to the J.V. Company.  The Pre-existing
              Technology is valued at [*].  Thereafter, subject to 
              subsection (c) below, AFC will make available to the J.V. Company
              (i) the Licensed Enhancements defined in Exhibit A as being part
              of the Pre-existing Technology; (ii) all Improvements relating to
              the UMC 1000 which become available during the Term hereof; and 
              (iii) such other Enhancements as are agreed upon by the Partners,
              pursuant to subsection (c) below.  In the event that a Software
              release which contains Improvements for the UMC 1000 also
              contains Enhancements which are not being licensed to the J.V.
              Company, AFC agrees to provide a separate unbundled fully tested
              release containing all such Improvements.



                                                                    Page 6 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         c.   The Partners intend that the basic functionality of the Product
              be kept as close as possible to the basic functionality of the
              UMC 1000.  Accordingly, AFC will offer all other Enhancements to
              the UMC 1000 to the J.V. Company subject to agreement by the
              Partners' Committee as to (i) the valuation of such Enhancement
              and; (ii) a mechanism for maintaining both Partners' equal
              ownership rights in the J.V. Company.

2.3      MANAGEMENT
         a.   PARTNERS' COMMITTEE
              The J.V. Company will be managed by a Partners' Committee
              composed of four members.  Each Partner shall appoint two (2)
              members to the Partners' Committee.  All Partners' Committee
              decisions will require the approval of a majority of the members.

              The number of members on the Partners' Committee shall not be
              increased or decreased without the prior written consent of both
              Tellabs and AFC.  The J.V. Company shall bear all reasonable
              travel expenses of any member attending a Partners' Committee
              meeting.

              The Partners will designate one Partners' Committee member as
              Chairman of the Committee.  The Chairman will be responsible for
              calling and conducting meetings The Chairman shall change on a
              semi-annual basis and shall be designated first by Tellabs, then
              by AFC on an alternating basis.

              Partners' Committee meetings shall be held at least quarterly
              during the Initial Design and Development Phase at times and
              places to be determined by the Partners' Committee, and notice of
              such meetings (including agenda items to be discussed) shall be
              given by the Chairman not less than 20 days in advance (which 20-
              day period may be shortened by written waiver of the members or 
              actual attendance at a special committee meeting).

         b.   GENERAL MANAGER
              If the Partners' Committee decides to hire a full-time general
              manager for the J.V. Company, the Partners shall jointly agree
              upon the individual selected.  If agreed by both Partners, the
              general manager may be added to the Partners' Committee of the
              J.V. Company.  In such an event, any decision requiring majority
              approval of the Partners' Committee will require the vote of at
              least one AFC appointed Partners' Committee member and one
              Tellabs appointed member.




                                                                    Page 7 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         c.   MANAGEMENT STRUCTURE
              The J.V. Company shall have managers with such responsibilities
              and reporting relationships as shall be determined by the
              Partners" Committee.

2.4      MATTERS SUBJECT TO PARTNERS' COMMITTEE APPROVAL
         a.   All decisions of the J.V. Company are subject to approval by the
              Partners through the Partners' Committee unless expressly
              delegated to the Design Committee pursuant to Section 3.2 hereof.
              The Partners' Committee, by majority vote, shall have the power
              to delegate to other managers of the J.V. Company any decisions
              within the ordinary course of business of the J.V. Company.
              Without limiting the generality of the foregoing, the following
              actions require Partners' approval:

              i.        The distribution or reinvestment of profits or any
                        other payment of any kind with respect to the Partners,
                        subject to the terms of Section 2.4b below;

              ii.       The investment or allocation of surplus funds;

              iii.      The transfer of any amount to reserves;

              iv.       The organization of, or the acquisition or disposition
                        of any interest in the legal or beneficial ownership
                        of, any other company or business organization;

              v.        Except as expressly authorized in this Agreement, any
                        sale, assignment, transfer, license or other
                        disposition of any manufacturing rights, know-how,
                        technology, trademarks, trade secrets or good will, or
                        the grant of any license or sublicense to manufacture
                        the J.V.  Product;

              vi.       Any agreement or transactions with any party hereto or
                        any of their Affiliates, other than purchases, licenses
                        or sales of product specifically authorized herein;

              vii.      The selection or change of the manufacturer for the
                        J.V. Products;

              viii.     The adoption or any material revision of the MRD;

              ix.       Any change in the transfer prices charged by the J.V.
                        Company;

              x.        The adoption of and amendments to the Product Support
                        Plan referred to in Section 7.2;



                                                                    Page 8 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

              xi.       Any material change in the J.V. Company's organization
                        (including reorganizations of departments or
                        reallocation of responsibilities of key employees);

              xii.      Approval of any financial statements of the J.V.
                        Company;

              xiii.     Appointment of and any change in the J.V. Company's
                        public    accounting firm/auditor;

              xiv.      Any material change in accounting principles or
                        procedures to be applied to the J.V. Company;

              xv.       Any acquisition, sale or lease of the J.V. Company's
                        assets or business or any capital improvement not
                        contemplated by the then current MRD;

              xvi.      Any purchase, sale or lease of real property;

              xvii.     The acquisition of any patent rights, technology,
                        know-how, trademarks, trade secrets or good will, or
                        of a license thereunder, except as specifically provided
                        in this Agreement;

              xviii.    Any establishment or material revisions of plans to
                        develop or commercialize new products or services, of
                        project priorities or of allocation of resources to
                        projects (including localization of software and
                        porting projects) other than as specified in the MRD;

              xix.      Borrowing of any funds or entry into any capital
                        leases;

              xx.       Adoption of and amendments to the Business Plan;

              xxi.      Any member of the Partners' Committee engaging in or
                        planning to enter into any of the following types of
                        transactions; (i) business that competes with the
                        business of the J.V. Company; (ii) transactions between
                        the J.V. Company and either the member or a third party
                        on whose behalf the member is acting, and (iii) any
                        other transaction between the J.V. Company and a third
                        party, in which the member has an interest contrary to
                        that of the J.V. Company; and

              xxii.     The adoption of and amendments to Exhibits A, B, C and
                        E to this Agreement.

                                      [*]


                                                                    Page 9 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

                                      [*]

2.5      PUBLIC ACCOUNTING FIRM/AUDITOR/LEGAL
         The J.V. Company shall have one auditor to be determined by the
         Partners' Committee by May 15, 1994.  Any changes to the auditor must
         be approved by the Partners' Committee.  In the event that the J.V.
         Company requires legal services, the Partners' Committee shall select
         an outside law firm, not currently representing either Partner.

2.6      FINANCIAL STATEMENTS AND ACCOUNTING RECORDS
         During the Term, financial statements for the J.V. Company, including,
         without limitation, a balance sheet and income statement, shall be
         submitted by the J.V. Company to the Partners within twenty (20) days
         after the end of each quarter and within thirty (30) days after the
         end of the fiscal year for such year.  Each of the annual statements
         shall be audited and certified by the auditor retained by the J.V.
         Company.  Each of the quarterly statements shall be reviewed by the
         auditor.  Such quarterly and annual statements shall be prepared on an
         accrual basis in accordance with U.S. generally accepted accounting
         principles.  Additionally, and in any event, the J.V. Company shall
         provide monthly financial statements to the Partners as they may
         request from time to time.  Notwithstanding the foregoing, estimated
         balance sheets and income statements for the J.V. Company shall be
         made available to Tellabs as soon as possible after the end of each
         Tellabs quarter, but no later than three (3) business days after the
         end of each Tellabs quarter and four (4) business days after the end
         of Tellabs' fiscal year.

2.7      RIGHT OF INSPECTION
         Both Partners shall have full access to all properties, books and
         account records and the like of the J.V. Company and the J.V. Company
         shall furnish to each Partner all information concerning the same
         which such Partner may reasonably require in connection with
         completing an examination thereof, and each Partner shall have the
         right to make copies from the books and records of the J.V. Company at
         any reasonable time.  Any information obtained through exercise of
         said right of access shall (i) be used by such Partner only for
         purposes which are consistent with its status as a partner in the J.V.
         Company and not for the pursuit of business interest outside the J.V.
         Company (except to the extent such Partner shall otherwise have rights
         for access to such information or to the extent used to determine
         compliance with this Agreement) and (ii) be subject to the
         confidentiality provisions of Section 8.4 and 8.5.

                                                                   Page 10 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

2.8      BUSINESS PLAN
         Prior to the beginning of each calendar year during the Term, the
         Partners' Committee shall determine and approve the Business Plan for
         the J.V. Company, for such year.  The Business Plan may be amended
         only by the Partners' Committee.

2.9      FUTURE FINANCINGS
         Unless the Partners otherwise agree in writing, if the Partners'
         Committee determines that the J.V. Company requires financing in
         excess of that provided pursuant to Section 2.2, the J.V. Company
         shall seek to obtain additional funding in the following priorities:
         a.   loans by the Partners;
         b.   third party debt with or without guarantees by the Partners;
         c.   further equity investments by the Partners; or
         d.   equity investments by third parties.

         If loans are made by the Partners, the interest rate will be a
         competitive rate set by the Partners' Committee.  For any loans by the
         Partners during the first year, the rate shall be [*].

         In the event that the Partners' Committee decides to require
         additional equity investments by the Partners, the investment shall
         take such form as is agreed upon by the Partners' Committee including
         but not limited to cash, technology rights or royalty adjustments.

         Unless the Partners otherwise agree in writing, all guarantees of debt
         or equipment lease financings, loans or additional investments
         provided by the Partners shall be provided in proportion to their
         ownership interests in the J.V. Company.  Each Partner shall be
         entitled to purchase a pro rata share of any issuances of partnership
         interests in the J.V. Company to retain its percentage interest
         relative to the other Partner and the other Partner's Affiliates In
         the event that the Partners' Committee approves the investment by any
         third parties in the J.V. Company, the dilution caused thereby shall
         be shared equally by the Partners.  If the additional investment is
         made by either Partner or an Affiliate of such Partner, the other
         Partner shall be entitled to increase it; investment in order to
         maintain its pro rata partnership interest.

2.10     PERMITTED TRANSFERS/ RIGHT OF FIRST REFUSAL
         The Partners agree not to Transfer their rights or interests in the
         J.V. Company except in accordance with each of the following
         restrictions:

         (a)  Before January 1, 1997, neither Partner shall be permitted to
              Transfer its ownership interest in the J.V. Company without the
              prior written consent of the other Partner.


                                                                   Page 11 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         (b)  If a Partner wishes to Transfer its ownership interest on or
              after January 1, 1997, the offering Partner shall first give
              written notice to the other Partner stating its intention to
              transfer, the name of the proposed transferee and the price,
              terms and conditions of the proposed Transfer.

         (c)  The other, non-offering Partner shall have the right to purchase
              all (but not less than all) of the ownership interest offered,
              which right shall be exercisable by written notice to the
              offering Partner not later than the expiration of thirty (30)
              days after delivery of the written notice of intention to sell.
              The price and terms shall be the price and terms stated in the
              notice.

         (d)  If the (other Partner does not exercise its right to purchase all
              of the offered interest within such thirty (30) day period, the
              offering Partner may within Sixty (60) days after expiration of
              such right, Transfer its interest to the transferee named in the
              notice; provided that (i) such Transfer is not at a lower price
              or on terms more favorable to the transferee than those specified
              in the written notice; (ii) prior to such Transfer, such
              transferee agrees in writing to undertake all the applicable
              rights and obligations of the offering Partner under this
              Agreement.

         (e)  The restrictions and other provisions of this Section 2.10 shall
              apply to any other J.V. Company ownership interest (or options,
              warrants or other rights to acquire the J.V. Company ownership
              interest) acquired by a Partner during the Term.

         (f)  The right of first refusal provided by this Section 2.10 shall
              not apply to a Transfer by both Partners to a third party pro
              rata with respect to their respective interest in the J.V.
              Company or to a transfer by a Partner to any Affiliate of the
              Partner, provided that prior to such Transfer the Affiliate
              agrees in writing to undertake all the rights and obligations of
              the Partner under this Agreement.

2.11     CASH MANAGEMENT, DISBURSEMENT AND INVESTMENT POLICIES
         All cash (including the initial cash contribution by Tellabs),
         disbursements and investments of the J.V. Company shall be handled in
         accordance with the terms of Exhibit F to this Agreement.  Any
         amendments to Exhibit F must be agreed upon by the Partners'
         Committee.






                                                                   Page 12 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00


                                      SECTION 3

                            DESIGN AND DEVELOPMENT PROGRAM

3.1      FINALIZATION OF MRD, INITIAL BUSINESS PLAN, AND EXHIBITS A, B, C AND E
         By April 22, 1994, the MRD, the initial Business Plan and Exhibits A.
         (as referred to in Section 1.23), B (as referred to in Section 3.4), C
         (as referred to in Section 5.2) and E (as referred to in Section 7.1)
         will be completed and submitted to the Partners' Committee for
         approval.  If the Partners" Committee has not approved the MRD, the
         initial Business Plan and Exhibits A, B, C and E by April 29,1994 (as
         such date may be extended by written agreement of the Partners) then,
         at the option of either Partner, this Agreement shall be terminated
         with the effect detailed in Section 13. 3(a) hereof.

3.2      DESIGN COMMITTEE
         The Partners' Committee of the J.V. Company will establish a Design
         Committee whose purpose will be to establish design and development
         direction for the Product.  This Design Committee will be comprised of
         two individuals each from Tellabs and AFC, including one engineering/
         design and one marketing person from each Partner.  In addition,
         Tellabs will assign a key program manager, who will reside in
         Petaluma, California throughout the Initial Design and Development
         Phase of the project, and will report to the Partners' Committee or
         general manager of the J.V. Company as well as serve as the fifth
         member of the Design Committee.  The Design Committee will be
         responsible for developing and reporting to the Partners' Committee,
         for its approval (prior to any execution) any material changes to the
         MRD relating to design definition, development plan, market plan and
         budget for development of the Product.

3.3      DEVELOPMENT RESPONSIBILITIES
         The J.V. Company shall develop the J.V. Product in accordance with the
         MRD.  Any material changes to the MRD which are identified by the
         Design Committee will be submitted to the Partners' Committee and are
         subject to Partners' Committee approval.  AFC will provide general
         architectural consulting for the UMC 1000.  Both AFC and Tellabs will
         design the architecture for the J.V. Product.  Tellabs shall provide
         the systems engineering and hardware and software design engineers to
         perform the design and development.  During the preliminary stages of
         the development, AFC will provide, at no charge, reasonable technical
         assistance to assist Tellabs" engineers in understanding the UMC 1000
         Technology not to exceed 500 staff-hours unless agreed by AFC.  Unless
         otherwise agreed by the Partners, the development work during the
         Initial Design and Development Phase will be conducted at AFC's
         facilities in Petaluma, California.


                                                                   Page 13 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         The J.V. Company will develop the Product as two distinct products
         with unique features designed in to protect the individual market
         rights of the respective Partners, as described in Section 6. These
         features will include both physical and functional differences
         designed to prevent the migration of the Product into markets for
         which rights have not been granted.

3.4      COMPENSATION FOR RESOURCES PROVIDED BY PARTNERS
         Tellabs and AFC shall be compensated by the J.V. Company for resources
         provided by such Partner as set forth in Exhibit B to this Agreement,
         as such exhibit may be amended from time to time.  Exhibit B will be
         agreed upon by the Partners' Committee and attached to this Agreement
         by April 29, 1994, as provided in Section 3.1 hereof




                                      SECTION 4

                                    RIGHTS TO USE

4.1      RIGHT TO USE UMC 1000 TECHNOLOGY
         Subject to the terms and conditions of this Agreement; AFC hereby
         grants to the J.V. Company a non-exclusive, irrevocable, perpetual,
         royalty-free, worldwide right to use the Pre-existing Technology for
         the purpose of developing the J.V. Product and making Improvements and
         Enhancements to the J.V. Product.  The rights granted herein shall
         also include the right to have the Product manufactured for the J.V.
         Company, subject to the terms and conditions hereof.  AFC shall offer
         and grant to the J.V. Company equivalent rights (i) to an Improvements
         to the UMC 1000 developed by AFC during the Term of this Agreement and
         (ii) all Enhancements which are agreed upon pursuant to Section 2.2
         hereof.  The rights granted herein shall also include the right to
         make minor modifications to the UMC 1000 System Components including
         but not limited to private labeling and software modifications which
         do not substantially change or supplement their functionality.  Except
         as set forth in Section 4.1 of Exhibit D hereto, during the Term of
         this Agreement, AFC agrees not to grant a license or right to any
         third party to use the UMC 1000 Technology to develop, have developed,
         manufacture, have manufactured, sell, market or distribute a product
         having functional characteristics and capacities which are similar to
         the UMC 1000 and/or the J.V. Product unless such license or right
         expressly prohibits the sale, marketing and distribution of such
         product to Alternate Providers, both directly and indirectly.  Prior
         to entering into a relationship with any third party which involves
         the license of or right to use the UMC 1000 Technology, AFC will
         review the terms of such relationship with the Partners' Committee.


                                                                   Page 14 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

4.2      RIGHTS TO MARKET STUDY
         Subject to the terms and conditions of this Agreement, Tellabs hereby
         grants to the J.V. Company a non-exclusive, irrevocable, perpetual,
         royalty-free, worldwide right to use the Market Study for the purpose
         of developing the J.V. Product and making decisions relating to future
         features and markets for the Product.




                                      SECTION 5

                               MANUFACTURING AND SUPPLY

5.1      MANUFACTURING RIGHTS
         The J.V. Company will procure assemblies, subassemblies and final
         system products for the Product from the most cost effective source,
         provided, however, that Tellabs shall be given preference as the
         manufacturer provided that its price and quality to the J.V. Company
         for the Product is substantially competitive with alternate
         manufacturers.  AFC shall have the right to direct the J.V. Company to
         subcontract the manufacture of AFC's requirements for the J.V. Product
         to another party, provided that AFC demonstrates to the Partners'
         Committee that the cost thereof is competitive with the then current
         manufacturer and provided that AFC continues to purchase all of its
         requirements for the J.V. Product from the J.V. Company.  Proposed
         manufacturers will be obligated to provide complete details on costs,
         including materials, assembly, and overhead, for finished/tested
         assemblies or product to allow for an effective evaluation and
         selection of the lowest cost manufacturer.

5.2      TRANSFER PRICE
         The Product(s) will be sold from the manufacturer to the J.V. Company
         at an agreed upon price.  Prices for the Product from the J.V. Company
         shall be determined by the Partners' Committee and set forth on
         Exhibit C to this Agreement by April 29, 1994, as provided in Section
         3.1. Any amendments to Exhibit C shall be approved by the Partners'
         Committee.

5.3      PURCHASE AND SALE OF PRODUCT
         a.   During the Term of this Agreement the J.V. Company will sell and
              supply to Tellabs (and its Affiliates) and, Tellabs (and its
              Affiliates) will be required to purchase from the J.V. Company,
              all of its requirements for the Products, including any
              Improvements and Licensed Enhancements thereto, on the terms and
              conditions set forth in this Agreement.


                                                                   Page 15 of 30

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                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         b.   During the Term of this Agreement, the J.V. Company will also
              sell and supply Products including any Improvements and Licensed
              Enhancements thereto, to the AFC Partner, on terms and conditions
              set forth in this Agreement.  The AFC Partner will be required to
              purchase only its requirements for the J.V. Product from the J.V.
              Company.

5.4      PURCHASES FROM AFC'S THIRD PARTY MANUFACTURERS
         Unless and until the J.V. Company selects another manufacturing
         source, the J.V. Company shall have the right to purchase Products
         (including UMC 1000 System Components) from AFC's third party
         manufacturers.  AFC will authorize such manufacturers to sell directly
         to the J.V. Company at prices no higher than those offered to AFC for
         the same components for the UMC 1000 at the same time.  The J.V.
         Company shall be responsible for any additional costs charged by the
         manufacturers for changes made to the UMC 1000 System Components for
         the J.V. Company.



                                      SECTION 6

                                   MARKETING RIGHTS


6.1  GENERAL
     a.    Each Partner will have exclusive rights to offer the complete 
           Product, the UMC 1000 system Components and/or the J.V. Product to 
           the markets defined in this Section 6. Except as provided in 
           Section 6.1 of Exhibit D, the respective Partners' marketing 
           rights as defined herein shall be exclusive and worldwide and 
           shall be granted for the Term of this Agreement. Within their 
           respective markets, the Partners are free to distribute the 
           Product, the UMC 1000 System Components and/or the J.V. 
           Product 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 Partner has entered into a written 
           agreement with the third party which allows the Partner to 
           terminate the distribution rights if the third party 
           distributes the Product, the UMC System Components and/or the 
           J.V. Product outside such Partners' respective market(s). 
           Neither Partner shall be allowed to grant sublicenses or 
           assign its rights in its market without the express approval 
           of the Partners' Committee, unless otherwise expressly 
           authorized by this Agreement.

     b.    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


                                                                   Page 16 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00


           agreements referred to in Section 6.1 of Exhibit D 
           in order to prohibit sales and/or distribution of the UMC 1000 
           or its derivatives, including but not limited to the UMC 
           1000E, to the Alternate Provider market in such territories by 
           such third parties.

     c.    Except as provided in Section 6.1 of Exhibit D, any agreements 
           entered into by AFC from and after the Effective Date relating 
           to the sale or distribution of the UMC 1000 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.

     d.    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.

6.2  TELLABS MARKETS
     Subject to the terms of Section 8.6 and except as provided in 
     Section 6.1 of Exhibit D and in Section 6.1 above, Tellabs will have 
     the exclusive worldwide rights to market the Product(s), the UMC 1000 
     System Components and/or the J.V. Product to Alternate Providers.

6.3  AFC MARKETS
     AFC will have exclusive worldwide rights to market the Product(s), 
     the UMC System Components and/or the J.V. Product to all other markets 
     not included in the definition of the Alternate Providers. AFC will 
     also have the right to purchase unique subassemblies from the J.V. 
     Company for eventual incorporation and distribution in the standard UMC 
     1000 product sold by AFC.


                                                                   Page 17 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

                                      SECTION 7

                                       SERVICES

7.1      GENERAL SERVICES
         AFC agrees to provide accounting, engineering services (CAD design,
         etc.), personnel, manufacturing (MRP, sourcing, etc.), facilities and
         general management/ administration services to the J.V. Company
         pursuant to the terms of the Services Agreement to be agreed upon by
         the Partners' Committee and attached as Exhibit E to this Agreement by
         April 29, 1994, as provided in Section 3.1 hereof.  Any amendments
         to Exhibit E shall be agreed upon by the Partners' Committee.  In the
         event the Partners' Committee determines that certain of such 
         services will be provided by Tellabs, a similar Services Agreement 
         will be signed with Tellabs.

7.2.     PRODUCT SUPPORT PLAN
         As soon as possible following the Effective Date, the Partners will
         jointly develop, and submit to the Partners' Committee for approval, a
         Product Support Plan for handling responsibility for Product support,
         including but not limited to sustaining engineering. Any amendments to
         the Product Support Plan shall be agreed upon by the Partner's
         Committee.



                                      SECTION 8

        INTELLECTUAL PROPERTY OWNERSHIP AND RIGHTS IN CONFIDENTIAL INFORMATION

8.1      OWNERSHIP OF J.V. PRODUCT TECHNOLOGY
         Subject to the rights granted under this Agreement, all right, title
         and interest in and to the proprietary rights in the J.V. Product
         Technology including any Improvements and Enhancements thereto
         developed by the J.V. Company, shall be vested in and shall remain in
         the J.V. Company and both Partners will have joint ownership thereof,
         subject to the various restrictions on use set forth herein.

8.2      OWNERSHIP OF UMC 1000 TECHNOLOGY
         Subject to the rights granted by AFC under this Agreement and subject
         to the matters disclosed in Section 8.2 of Exhibit D, all right, title
         and interest in and to the proprietary rights in UMC 1000 Technology
         shall be vested in and shall remain in AFC and/or its Affiliates.
         Notwithstanding the foregoing, any minor modifications to the UMC 1000
         Technology made by the J.V. Company including but not limited to
         private labeling and software modifications which do not
         substantially change or supplement its functionality, shall be deemed
         to be


                                                                   Page 18 of 30

<PAGE>

                                       TELLABS CONTRACT NO.:  JDL940399LEG-00

         owned by the J.V. Company and both Partners will have joint ownership
         thereof, subject to the various restrictions on use set forth herein.

8.3      OWNERSHIP OF THE MARKET STUDY
         Subject to the rights granted by Tellabs under this Agreement, all
         right, title and interest in and to the proprietary rights in the
         Market Study shall be vested in and shall remain in Tellabs and/or its
         Affiliates.

8.4      TELLABS CONFIDENTIAL INFORMATION
         AFC acknowledges that Tellabs claims that certain information to be
         disclosed by Tellabs to AFC under this Agreement is confidential and
         proprietary information of Tellabs ("Tellabs Confidential
         Information").  No information shall be considered Tellabs
         Confidential Information unless (a) for information disclosed in
         writing, the writing is marked "confidential" or "proprietary," or
         with words of similar import, at the time of disclosure to AFC, or (b)
         for information disclosed orally, the confidential nature of the
         information is indicated at the time of disclosure and the information
         is summarized in a writing indicating its confidential nature that is
         delivered to AFC within twenty (20) days after disclosure.  AFC
         agrees, during the term of this Agreement and for five (5) years after
         its termination for any reason, to protect Tellabs Confidential
         Information against disclosure or dissemination using the same
         standard of care and procedures which it uses to protect its own
         proprietary information of a similar nature.  Information shall not be
         considered to be Tellabs Confidential Information if it can be
         demonstrated by written record that it (a) was already known by AFC
         without restriction; (b) was or became publicly known through no
         wrongful act of AEC; (c) was received from third parties subject to no
         restriction of confidentiality; (d) was independently developed by
         AFC; or (e) was disclosed by Tellabs to any third party without an
         obligation of confidentiality.  Nothing contained herein shall
         prohibit AFC from disclosing Tellabs Confidential Information to the
         extent (but only to the extent) such disclosure is required by law or
         government regulation, provided that AFC shall use all reasonable
         efforts to give Tellabs advance written notice of such mandated
         disclosure.  AFC has or will secure a written agreement containing
         substantially these terms from each employee of AFC who will have
         access to Tellabs Confidential Information.

8.5      AFC CONFIDENTIAL INFORMATION
         Tellabs acknowledges that AFC claims that certain information to be
         disclosed by AFC to Tellabs under this Agreement is confidential and
         proprietary information of AFC ("AFC Confidential Information").  No
         information shall be considered AFC Confidential Information unless
         (a) for information disclosed in writing, the writing is marked
         "confidential" or "proprietary," or with words of similar import, at
         the time of disclosure to Tellabs, or (b) for information disclosed
         orally, the confidential nature of the information is indicated at the
         time of disclosure and the information is summarized in a writing
         indicating its confidential nature that is delivered to Tellabs, within
         twenty (20) days after

                                                                   Page 19 of 30

<PAGE>

                                       TELLABS CONTRACT NO.:  JDL940399LEG-00

         disclosure.  Tellabs agrees during the term of this Agreement and for
         five (5) years after its termination for any reason, to protect AFC
         Confidential Information against disclosure or dissemination using the
         same standard of care and procedures which it uses to protect its own
         proprietary information of a similar nature.  Information shall not be
         considered to be AFC Confidential Information if it can be
         demonstrated by written record that it (a) was already known by
         Tellabs without restriction; (b) was or became publicly known through
         no wrongful act of Tellabs (c) was received from third parties subject
         to no restriction of confidentiality; (d) was independently developed
         by Tellabs; or (e) was disclosed by AFC to any third party without an
         obligation of confidentiality. Nothing contained herein shall prohibit
         Tellabs from disclosing AFC Confidential Information to the extent
         (but only to the extent) such disclosure is required by law or
         government regulation, provided that Tellabs shall use all reasonable
         efforts to give AFC advance written notice of such mandated
         disclosure.  Tellabs has or will secure a written agreement containing
         substantially these terms from each employee of Tellabs who will have
         access to AFC Confidential Information.

8.6      INDEPENDENT DEVELOPMENT
         Nothing contained in this Agreement shall be construed as a
         restriction on either Partner'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
         Product, the J.V. Product or the UMC 1000, provided that such
         development, manufacture, acquisition, sale or other distribution does
         not violate any of the provisions of this Agreement.  No payment shall
         be due to either party by reason of such independent development,
         manufacture and/or sale or other distribution.  Notwithstanding the
         foregoing, if after the Effective Date hereof, Tellabs develops or
         acquires a similar or functionally equivalent product and thereafter
         sells such product in the Alternate Provider market in territories in
         which Tellabs has exclusively for the Products, the J.V. Products and
         the UMC 1000 System Components, the exclusivity provided for in
         Section 6 for such territories will be deemed deleted.  None of the
         products being marketed by Tellabs or any of its Affiliates as of the
         Effective Date, including any future Enhancements and Improvements
         thereto, will be deemed to be "similar or functionally equivalent
         products."


                                                                   Page 20 of 30

<PAGE>

                                       TELLABS CONTRACT NO.:  JDL940399LEG-00

                                      SECTION 9


9.1      GENERAL

         Tellabs agrees to pay royalties to AFC for all UMC System 
Components sold, licensed or otherwise distributed by Tellabs [*] according 
to the following schedule: [*]




                                                                   Page 21 of 30
<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00


9.3      AUDIT
         AFC shall be entitled to have an independent third party auditor,
         reasonably acceptable to Tellabs, audit compliance with this Section 9
         no more frequently than once each calendar year.  In the event the
         auditor finds that royalties have been underpaid by more than 10% of
         the corrected total royalty for the period audited, Tellabs shall pay
         the audit fees.  Otherwise, AFC shall bear the cost of the audit.



                                      SECTION 10

                             WARRANTY AND INDEMNIFICATION

10.1     OWNERSHIP WARRANTY AS TO UMC 1000 TECHNOLOGY
         AFC represents and warrants to Tellabs and the J.V. Company that (i)
         the UMC 1000 Technology is original with and is owned solely by AFC;
         (ii) the UMC 1000 Technology does not 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; (iv)
         AFC has not previously or otherwise granted any other right in  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 the J.V.
         Company.  The disclosures set forth in Section 8.2 of Exhibit D shall
         in no way limit the warranties contained in this Section 10.1 or the
         indemnification rights contained in Section 10.2.

10.2     INDEMNIFICATION FOR BREACHES OF OWNERSHIP WARRANTY
         Notwithstanding any other provision contained in the Agreement, AFC
         shall defend at its sole expense any claim, demand, or suit against
         the J.V. Company, or Tellabs, its Affiliates, Distributors, or End
         Users alleging a breach of any of the warranties set forth in the
         preceding Section 10.1 and shall pay the full amount of any settlement
         or judgment resulting from any such claim, demand or suit, including
         reasonable costs and attorney's fee, provided that Tellabs promptly
         informs AFC in writing of any such claim, demand or suit, and, at
         AFC's request and expense, provides AFC with all reasonably available
         information, assistance and authority to enable AFC to defend the
         same.  Tellabs shall not settle any such claim, demand or suit without
         AFC's prior consent.  In addition, following notice of a claim or
         demand or a threatened or actual suit, AFC shall, at its own expense,
         either procure for Tellabs, its Affiliates, Distributors and End Users
         the right to continue full enjoyment of the rights and licenses
         granted under this Agreement with respect to any licensed subject
         matter that is subject to such claim, demand or suit, or replace or
         modify the same to make them non-infringing.  If AFC elects to replace
         or modify such subject matter, the
                                                                   Page 22 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         replacement or modification shall substantially meet the performance
         specifications of the replaced material and shall be usable by
         Tellabs, its Affiliates, Distributors, and End Users as a direct
         replacement for the replaced material without any need for
         modification thereof.  AFC agrees further to pay all costs incurred by
         Tellabs in connection with such replacement or modification. If
         Tellabs reasonably concludes that AFC may not be able to satisfy a
         potential judgment or that AFC is not adequately protecting Tellabs'
         interests in such claim, demand or suit, Tellabs may control the
         defense of such claim, demand or suit at AFC's expense.  AFC agrees
         that it will not enter into any settlement of such claim, demand or
         suit without the consent of Tellabs, which consent will not be
         unreasonably withheld.  AFC shall have no liability hereunder to the
         extent that such liability results from modifications to the UMC 1000
         or the UMC 1000 Technology which were made by the J.V. Company,
         Tellabs, or any of their agents or distributors.

10.3     LIMITATION OF LIABILITY
         NEITHER PARTNER SHALL BE LIABLE TO THE OTHER OR TO THE J.V. COMPANY
         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.
         EXCEPT AS EXPRESSLY PROVIDED HEREIN, THE PARTNERS DISCLAIM ANY AND ALL
         WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THE
         WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

10.4     INSURANCE
         Each of the Partners shall deliver to the other and to the J.V.
         Company, and shall keep current at all times during the Term hereof,
         Certificates of Insurance evidencing insurance coverages satisfactory
         to the Partners' Committee.

10.5     PRODUCT LIABILITY, PERSONAL INJURY AND PROPERTY DAMAGE
         Notwithstanding anything to the contrary herein, AFC shall indemnify
         and save harmless Tellabs and the J.V. Company from any loss or
         damages (including reasonable attorney's fees) incurred by Tellabs or
         the J.V. Company because of claims, suits, or demands resulting from
         personal injury or property damage, to the extent such loss or damage
         is caused by or results from defects in the UMC 1000 Product or the
         UMC 1000 Technology or the negligent or willful acts or omissions of
         AFC or its employees or agents provided: (i) AFC is promptly notified
         in writing of any suits, claims, or demands for which AFC is
         responsible under this indemnity; (ii) AFC is given full opportunity
         and authority to assume the sole defense of and settlement of such
         suits; and (iii) AFC is furnished upon request, with all information
         and reasonable assistance available to Tellabs and the J.V. Company
         for defense against any such suit, claim or demand.  To the extent
         that the injury or damage results from the negligent or willful acts
         or

                                                                   Page 23 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         omissions of Tellabs or its employees or agents, Tellabs shall
         indemnify and defend AFC and the J.V. Company in accordance with the
         same terms.  Nothwithstanding the foregoing to the extent that the
         injury or damage results from (i) defects in the J.V. Product or J.V.
         Product Technology, (ii) modifications to the UMC 1000 made by the
         J.V. Company; or (iii) the integration of the J.V. Product with the
         UMC 1000, the J.V. Company shall be liable therefor.


                                      SECTION 11

                                  TERM OF AGREEMENT


11.1     TERM
         The Term of this Agreement shall be fifteen (15) years from the date
         first set forth above, unless sooner terminated as provided herein.

11.2     TERMINATION
         This Agreement and the J.V. Company created hereby shall be subject to
         termination prior to the end of the Term for the reasons set forth in
         Section 13.



                                      SECTION 12

                                       DEFAULT


12.1     DEFAULT OF TELLABS
         Tellabs shall be deemed to be in material default under this Agreement
         upon the occurrence of any of the following:

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

         b.   In the event that Tellabs or any of its Affiliates (i)attempts to
              assign, mortgage, transfer, sublicense or otherwise encumber its
              rights hereunder to the J.V. Product Technology (or any
              Improvements thereof) or the UMC 1000 Technology (or any
              Improvements thereto), or to grant rights to any third party
              which are prohibited by the terms of this Agreement except in
              each case, as expressly authorized hereby; and (ii) fails to cure
              such default within thirty (30) days after receipt of written
              notice thereof.


                                                                   Page 24 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         c.   In the event that Tellabs ceases to do business, becomes
              insolvent, becomes subject to a receiver or trustee, becomes
              subject to a voluntary or involuntary petition under the United
              States Bankruptcy Laws, or attempts to make any assignment for
              the benefit of creditors.

12.2     DEFAULT OF AFC
         AFC shall be deemed to be in material default under this Agreement
         upon the occurrence of any of the following:

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

         b.   In the event that AFC or any of its Affiliate (i) attempts to
              assign, mortgage, transfer, sublicense or otherwise encumber its
              rights hereunder to the J.V. Product Technology (or any
              Improvements thereto), or to grant rights to any third party
              which are prohibited by the terms of this Agreement except, in
              each case, as expressly authorized hereby; and (ii) fails to cure
              such default within thirty (30) days after receipt of written
              notice thereof.
         c.   In the event that AFC ceases to do business, becomes insolvent,
              becomes subject to a receiver or trustee, becomes subject to a
              voluntary or involuntary petition under the United States
              Bankruptcy Laws, or attempts to make any assignment for the
              benefit of creditors.

12.3     DEFAULT REMEDIES
         Upon a material default by either party hereunder, the other party
         may, at its election, seek any remedies available to it, including
         termination of this Agreement and the J.V. Company, as provided in
         Section 13.



                                      SECTION 13

                                     TERMINATION


13.1     TERMINATION RIGHTS
         This Agreement may be terminated:

         a.   Under the circumstances described in Section 3.1;


                                                                   Page 25 of 30

<PAGE>

                                       TELLABS CONTRACT NO.:  JDL940399LEG-00

         b.   If the Partners' Committee determines that the J.V. Product or
              market concept is not achievable from either an economic or
              technological perspective; and/or

         c.   By written notice for any event of material default specified in
              Section 12.1 or Section 12.2.

13.2     SURVIVAL OF RIGHTS AND OBLIGATIONS
         The rights and obligations of any of the provisions hereof which, by
         their terms involve continuing obligations, shall be deemed to survive
         termination or expiration of this Agreement, in accordance with their
         terms.

13.3     EFFECT OF TERMINATION ON LICENSE RIGHTS
         a.   In the event that the Agreement is terminated as provided in
              Sections 13.1(a) or (b) then, unless otherwise agreed, the
              Partners agree to liquidate the J.V. Company first by having any
              excess but not committed cash distributed back to Tellabs and AFC
              in such proportions as such Partner's total cash contributions to
              the J.V. Company bears to the total of all cash contribution made
              to the J.V. Company by both Partners (up to the full amount of
              such Partners cash contribution to the J.V. Company).  Any
              remaining cash shall be split equally and the remaining assets
              distributed in a fair and equitable manner, and, in addition, all
              licenses will terminate and each Partner shall receive back full
              rights in the respective technology and/or market information
              supplied by it.

         b.   In the event that the Agreement is terminated by one party due to
              the material default of the other as provided in Section 13.1(c),
              the licenses granted to the J.V. Company in Sections 4.1 and 4.2
              will be convened to licenses to the non-defaulting party.
              Furthermore, in such event, and subject only to the payment of
              any applicable royalties pursuant to Section 9, the license shall
              be unrestricted and shall not be subject to the market
              restrictions set forth in Section 6. In order to secure the
              rights hereunder, each Partner shall be entitled to maintain, at
              its principal place of business and in the custody of its Legal
              Department, one duplicate copy of all UMC 1000 Technology and
              J.V. Product Technology, which shall be kept current at all
              times.  Such duplicate copies shall not be used unless and until
              the rights under this subsection b are granted.

         c.   In the event of a termination, the Partners will be obligated to
              agree upon terms and conditions which provide for continuing
              support for each Partner's embedded customer base.


                                                                   Page 26 of 30

<PAGE>

                                       TELLABS CONTRACT No.: JDL940399LEG-00


                                      SECTION 14

                                    MISCELLANEOUS

14.1     GOVERNING LAW
         This Agreement shall be governed by the law of the State of California
         excluding its conflicts of laws provisions.

14.2     EXPORT
         The parties acknowledge that the materials made available to them
         hereunder and the direct product(s) produced through use thereof may
         be subject to the Export Administration Regulations of the United
         States Department of Commerce and other United States Government
         regulations relating to the export of technical data and equipment and
         product(s) produced therefrom.  The parties are familiar with and
         agree to comply with all such regulations, including any future
         modifications thereof.

14.3     ENTIRE AGREEMENT
         This Agreement, including the Exhibits hereto, which are hereby
         expressly incorporated herein, and any other document incorporated by
         reference herein, constitutes the complete, final and exclusive
         understanding between Tellabs and AFC with respect to the subject
         matter hereof and supersedes any prior negotiations, discussions or
         agreements including but not limited to the Memorandum of
         Understanding dated January 13,1994.

14.4     WAIVER AND AMENDMENT
         No waiver, amendment or modification of any provision hereof shall be
         effective unless in writing and signed by the party against whom such
         waiver, amendment or modification is sought to be enforced.  No
         failure or delay by either party in exercising any right, power or
         remedy hereunder shall operate as a waiver of any such right, power or
         remedy.

14.5     NOTICES
         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 its clause. Notices to AFC shall be sent to Attention: Daniel
         Steimle (Fax: 707-794-7777), with a copy to Attention: Michael
         Hatfield (Fax: 707-794-7777), at the same address.  Notices to Tellabs
         shall be sent to Attention: Jon C. Grimes (Fax: 708-378-6721), with a
         copy to Attention: Legal Department (Fax: 708-512-7293), at the same
         address.  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, as aforesaid, (iii) one (1) business day after transmission
         by


                                                                   Page 27 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         overnight delivery, or (iv) the day of receipt after transmission by
         facsimile where receipt has been confirmed.

14.6     SEVERABILITY
         In the event that any provision of this Agreement is held to be
         unenforceable or illegal, such provision shall be severed; and the
         entire Agreement shall not fail, but the balance of the Agreement
         shall continue in full force and effect.  In such event, the parties
         agree to negotiate in good faith a substitute enforceable and legal
         provision which most nearly effects the intent of the parties in
         entering into this Agreement.

14.7     ASSIGNMENT/CHANGE IN CONTROL
         Except as expressly permitted by the terms of this Agreement, neither
         Tellabs nor AFC (or their Affiliates) shall be entitled to assign any
         of their rights or obligations hereunder without the express prior
         written consent of the other.  In the event that either Tellabs or AFC
         (or either Partner, if different) become subject to an actual or
         potential change in ownership (or an actual or potential sale of
         substantially all of such parties' assets) ("Change in Control"), the
         party subject to such Change in Control shall be obligated to provide
         written notice to the other and shall obtain the other party's prior
         written consent to such Change in Control, which consent shall not be
         unreasonably withheld.

14.8     LEGAL EXPENSES
         The parties shall bear their own legal expenses and fees incurred on
         their respective behalfs with respect to this Agreement and the
         transactions contemplated hereby.

14.9     ATTORNEY'S FEES
         The prevailing party in any action arising out of this Agreement or
         the transactions contemplated hereby shall be entitled to recover its
         costs and its reasonable attorney's fees incurred therein.

14.10    RIGHTS AND REMEDIES CUMULATIVE
         The rights and remedies herein provided shall be cumulative and not
         exclusive of any other rights or remedies provided by law or
         otherwise.

14.11    PUBLICITY
         The parties shall maintain the terms of this Agreement in confidence
         and neither party may originate any publicity, news release or other
         public announcement relating to this Agreement or die terms hereof
         without the prior written approval of the other party, except as
         otherwise required by law or governmental regulation (in which event
         reasonable prior notice shall be given to the other party).



                                                                   Page 28 of 30

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                                       TELLABS CONTRACT NO.: JDL940399LEG-00

14.12    TIME OF ESSENCE
         Time is of the essence in all terms and conditions hereof.  In
         determining any time period herein, the day upon which action is taken
         to start the period shall not be counted and the period shall end on
         the last designated day of the period.

14.13    FORCE MAJEURE
         Neither party shall be responsible for delays or failures in the
         performance resulting from acts of God, labor strikes, acts of war of
         civil disruption, governmental regulations imposed after the fact,
         public utility failures, industry-wide shortages of labor or material
         or natural disasters.

14.14    COMPLIANCE WITH LAWS
         In performing under this Agreement, each party shall comply with all
         federal, state, and local laws, ordinances, rules and regulations.  A
         party violating or alleged, to have violated any federal, state, or
         local law, ordinance, rule or regulation shall defend and hold
         harmless the other party and the other party's Affiliates,
         Distributors, and End Users from any loss, damages or costs arising
         from or caused in any way by any such violation or alleged violation.

14.15    COUNTERPARTS
         This 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.



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


ADVANCED FIBRE COMMUNICATIONS                         TELLABS OPERATIONS, INC.



By: /s/Donald Green                              By: /s/Brian J. Jackman
   --------------------------                    ---------------------
Name: Donald Green                               Name: Brian J. Jackman
     ------------------------                          -------------------
Title: President & CEO                           Title: President
      -----------------------                           ------------------
Date: 4/18/94                                    Date: 4/21/94
     ------------------------                          -------------------



                                                                   Page 29 of 30
<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00


                                    EXHIBIT INDEX


    Exhibit
      A.      Pre-existing Technology and Licensed Enhancements

      B.      Compensation for Resources

      C.      Formula for Determining Prices for the Product

      D.      Schedule of Exceptions

      E.      Services Agreement

      F.      Cash Management, Disbursement, and Investment Policies





                                                                   Page 30 of 30

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00


                                      EXHIBIT D
                                SCHEDULE OF EXCEPTIONS


This Schedule of Exceptions is provided pursuant to the Joint Venture and
Partnership Agreement dated as of April 11, 1994, between Advanced Fibre
Communications ("AFC" or the "Company") and Tellabs Operations, Inc.
("Tellabs").  Unless otherwise indicated, defined terms used herein have the
same meaning as set forth in the Agreement The Section references below
correspond to the sections in the agreement modified hereby.

SECTION 4.1

    1.        The Company has been in discussions with Harris Corporation
              which, in addition to other items, could result in Harris and AFC
              entering into an agreement to develop a version of the UMC 1000
              integrated with the Harris product known as the Harris 20/20
              switch.  AFC warrants that the Harris agreement will prohibit the
              inclusion of integrated RF capability in any product developed
              between Harris and AFC during the period under which AFC and
              Tellabs are operating under the exclusivity of their agreement.

SECTION 6.1

    1.        The product noted in 1. above, 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 18 months, with the right for 24 month
              extensions.

    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.



                                                                     Page 1 of 3

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

    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 Institute ("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.

    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.

SECTION 8.2

    1.   On April 15,1993, Donald Green filed a complaint in the Superior Court
         of the State of California in and for the County of Sonoma against DSC
         Communications Corporation et al. alleging breach of contact.  The
         defendants answered the complaint on June 4, 1993 by generally denying
         each allegation therein.

    2.   On July 20, 1993, DSC Communications Corporation ("DSC") and DSC
         Technologies Corporation (collectively the "Plaintiffs") filed a
         complaint against the Company, Alan Negrin, Henri Sulzer and Quadrium
         Corporation in the United States District Court, Eastern District of
         Texas, alleging, among other things, tortious interference with
         contractual relations against the Company, tortious interference with
         prospective contracts and business relationships against the Company,
         and civil conspiracy against all the defendants (Civil Action No.
         2-93CV126).




                                                                     Page 2 of 3

<PAGE>

                                       TELLABS CONTRACT NO.: JDL940399LEG-00

         On August 26, 1993, the Plaintiffs' filed a First Amended Complaint,
         restating certain of the allegations in the original complaint and
         also seeking a judicial declaration that, among other, things, the
         Company's proprietary technology and products are property of
         Plaintiffs.  The complaint, as amended, also seeks an injunction
         prohibiting the Company from using, transferring or disclosing certain
         proprietary information, products and property that the Plaintiffs
         allege belong to them.  The complaint as amended, seeks punitive
         damages and attorneys' fees.

         Since August 26, 1993, numerous motions have been made, the defendants
         have filed counterclaims, discovery has begun, a trial date has been
         set, and an Offer of Judgement has been made to the Plaintiffs.

         The Company vigorously denies the allegations made by the Plaintiffs
         and intends to continue to contest the actions.  In the opinion of
         management the allegations contained in the complaints are without
         merit, but the outcome of this litigation or the impact of such
         outcome on the Company cannot be predicted at this time, other than
         the impact from acceptance by the Offer of Judgement.




                                                                     Page 3 of 3

<PAGE>

                                      EXHIBIT F.


                CASH MANAGEMENT, DISBURSEMENT, AND INVESTMENT POLICIES


CASH MANAGEMENT AND DISBURSEMENT POLICIES

The partnership shall establish a main account and a zero disbursement account
at a bank approved by both parties.

An approved bank must satisfy the following minimum criteria:

    -    Minimum asset size of $3 billion.
    -    Satisfactory rating from Thompson's Bank Watch and an "A" rating or
         better from Standard and Poor's.

The partnership will issue checks drawn against the zero disbursement account
which will be funded, on an as needed basis, by the main account.

Signature authority and approval limits with respect to partnership
disbursements are summarized below:



                                      [*]


INVESTMENT POLICY

Cash investments are limited to investments satisfying the criteria per the
Tellabs Inc. Investment Policy, attached as Exhibit F.1.

The investment strategy shall be mutually agreed upon by Dan Steimle and Chris
Birck or Robert Settles on a quarterly basis prior to investing available cash.

<PAGE>

                                      EXHIBIT F1


                                    TELLABS, INC.
                                  INVESTMENT POLICY

 

                                      [*]




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