ADVANCED FIBRE COMMUNICATIONS INC
S-1/A, 1997-02-10
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 10, 1997
    
   
                                                      REGISTRATION NO. 333-20369
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                              -------------------
 
   
                                AMENDMENT NO. 2
    
   
                                       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.                              KENNETH M. SIEGEL, ESQ.
              DAVID R. GILBERT, ESQ.                             TAMARA G. MATTISON, ESQ.
         BROBECK, PHLEGER & HARRISON LLP                     WILSON SONSINI GOODRICH & ROSATI
                    ONE MARKET                                   PROFESSIONAL CORPORATION
                SPEAR STREET TOWER                                  650 PAGE MILL ROAD
             SAN FRANCISCO, CA 94105                             PALO ALTO, CA 94304-1050
                  (415) 442-0900                                      (415) 493-9300
</TABLE>
 
                              -------------------
 
    APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: AS SOON AS
PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
 
    If any of the securities being registered on this form are to be offered  on
a  delayed or continuous basis pursuant to  Rule 415 under the Securities Act of
1933, check the following box. / /
 
    If this Form  is filed  to register  additional securities  for an  offering
pursuant  to Rule 462(b) under  the Securities Act, check  the following box and
list the  Securities  Act registration  statement  number of  earlier  effective
registration statement for the same offering. / /
 
    If  this Form  is a post-effective  amendment filed pursuant  to Rule 462(c)
under the Securities Act,  check the following box  and list the Securities  Act
registration  statement number  of the earlier  effective registration statement
for the same offering. / /
 
    If delivery of the prospectus is expected  to be made pursuant to Rule  434,
please check the following box. / /
                              -------------------
 
   
    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.............................  $     47,002
NASD filing fee.................................................................        16,011
Nasdaq National Market listing fee..............................................         4,000
Printing and engraving expenses.................................................        85,000
Legal fees and expenses.........................................................       125,000
Accounting fees and expenses....................................................        75,000
Blue sky fees and expenses......................................................         3,000
Transfer agent and registrar fees...............................................         5,000
Miscellaneous expenses..........................................................        89,987
                                                                                  ------------
      Total.....................................................................  $    450,000
                                                                                  ------------
                                                                                  ------------
</TABLE>
 
- ---------
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Section 145 of  the General Corporation  Law of the  state of Delaware  (the
``Delaware  Law") empowers a  Delaware corporation to  indemnify any persons who
are, or  are  threatened to  be  made, parties  to  any threatened,  pending  or
completed   legal  action,   suit  or  proceedings,   whether  civil,  criminal,
administrative or investigative (other  than action by or  in the right of  such
corporation),  by reason of the fact that such person was an officer or director
of such corporation, or is or was serving at the request of such corporation  as
a director, officer, employee or agent of another corporation or enterprise. The
indemnity may include expenses (including attorneys' fees), judgments, fines and
amounts  paid in settlement  actually and reasonably incurred  by such person in
connection with such action, suit or  proceeding, provided that such officer  or
director  acted in good faith and in a manner he reasonably believed to be in or
not opposed to the corporation's best interests, and, for criminal  proceedings,
had  no  reasonable  cause  to  believe  his  conduct  was  illegal.  A Delaware
corporation may indemnify officers and directors in an action by or in the right
of the corporation under the same conditions, except that no indemnification  is
permitted without judicial approval if the officer or director is adjudged to be
liable  to the corporation in  the performance of his  duty. Where an officer or
director is successful on the merits or  otherwise in the defense of any  action
referred to above, the corporation must indemnify him against the expenses which
such officer or director actually and reasonably incurred.
 
    In accordance with the Delaware Law, the certificate of incorporation of the
Company contains a provision to limit the personal liability of the directors of
the Registrant for violations of their fiduciary duty. This provision eliminates
each  director's liability  to the Registrant  or its  stockholders for monetary
damages except (i)  for any  breach of  the director's  duty of  loyalty to  the
Registrant  or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)  under
Section  174  of  the Delaware  Law  providing  for liability  of  directors for
unlawful payment of  dividends or  unlawful stock purchases  or redemptions,  or
(iv)  for any  transaction from  which a  director derived  an improper personal
benefit. The effect of this provision is to eliminate the personal liability  of
directors for monetary damages for actions involving a breach of their fiduciary
duty of care, including any such actions involving gross negligence.
 
                                      II-1
<PAGE>
    Article  five of the Bylaws of the Registrant provide for indemnification of
the officers and directors of the Registrant to the fullest extent permitted  by
applicable law.
 
   
    In  connection  with the  incorporation of  the Registrant  in the  State of
Delaware, the  Registrant  entered  into indemnification  agreements  with  each
director  and certain  officers, a  form of which  is attached  as Exhibit 10.20
hereto and  incorporated herein  by  reference. The  Indemnification  Agreements
provide   indemnification  to   such  directors   and  officers   under  certain
circumstances for acts or omissions which  may not be covered by directors'  and
officers'  liability  insurance. The  Company  intends to  obtain  directors and
officers  liability  insurance,  which  will  insure  against  liabilities  that
directors  or officers of the Company may incur in such capacities. Reference is
also made to Section  8 of the Underwriting  Agreement contained in Exhibit  1.1
hereto,  indemnifying officers and  directors of the  Registrant against certain
liabilities.
    
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
    Since January  1994,  the  Registrant  has sold  and  issued  the  following
securities  which were not registered under the Securities Act (all numbers take
into account the stock splits effected in September 1995 and August 1996):
 
   
    (i) Since January  1994, the  Registrant has  granted stock  options to  its
employees under its stock option plans covering an aggregate of 3,942,006 shares
of  the  Registrant's Common  Stock, at  exercise prices  ranging from  $0.25 to
$59.625 per share.  The Registrant has  issued 264,565 shares  upon exercise  of
these stock options.
    
 
    (ii)  In March and May 1994, the  Registrant issued and sold an aggregate of
3,200,000 shares of Series C Preferred Stock (convertible into 3,508,988  shares
of Common Stock) at $2.50 per share to 31 investors, and warrants to purchase an
aggregate  of  600,000  shares of  Common  Stock  at $0.25  per  share  to three
investors, and warrants to purchase an  aggregate of 5,019,520 shares of  Common
Stock at $1.165 per share to 31 investors.
 
   (iii)  In  October  1994, the  Registrant  issued  and sold  an  aggregate of
2,080,000 shares of Series D Preferred Stock (convertible into 2,280,844  shares
of Common Stock) at $3.125 per share to 13 investors.
 
    (iv)  In May 1995,  the Registrant issued  and sold an  aggregate of 563,600
shares of Common Stock at $0.3125 per share to Donald Green, James Hoeck,  Henri
Sulzer  and John Webley pursuant to a restricted stock issuance program approved
by the Company's Board of Directors.
 
    (v) In  September 1995,  the  Registrant issued  and  sold an  aggregate  of
2,193,540  shares of Series E Preferred Stock (convertible into 2,249,014 shares
of Common Stock) at $7.00 per share to 10 investors, and warrants to purchase an
aggregate of 30,068 shares  of Common Stock  at $7.00 per  share to Hambrecht  &
Quist, L.P.
 
    (vi)  In April 1996, the Registrant issued  and sold an aggregate of 220,000
shares of Series F  Preferred Stock (convertible into  220,000 shares of  Common
Stock)  at an effective price of $7.00 per share to Elec and Eltek Communication
Holdings Limited. The Registrant purchased all  of the stock of AFTEK-Hong  Kong
that  had not previously  been owned by  the Registrant in  exchange for 220,000
shares of such shares of Series F Preferred Stock and approximately $939,000  in
cash.
 
   
   (vii) Since January 1994, the Registrant has issued and sold 4,311,920 shares
of Common Stock upon exercise of warrants to 43 individuals.
    
 
   
  (viii) Since January 1994, the Registrant has issued and sold 23,685 shares of
Common  Stock under its Employee Stock Purchase  Plan at $21.25 per share to 364
individuals.
    
 
                                      II-2
<PAGE>
    The sales and issuances  of securities in  the transactions described  above
were  deemed to be exempt from registration under the Securities Act in reliance
upon Section 4(2) of the Securities Act, or Regulation D promulgated thereunder,
or  Rule  701  promulgated  under  Section  3(b)  of  the  Securities  Act,   as
transactions  by an  issuer not  involving any  public offering  or transactions
pursuant to compensatory benefit plans  and contracts relating to  compensations
as  provided  under  Rule  701.  The  recipients  of  securities  in  each  such
transaction  represented  their  intentions   to  acquire  the  securities   for
investments  only and  not with  a view to  or for  sale in  connection with any
distribution thereof  and appropriate  legends were  affixed to  the  securities
issued  in such transactions. All recipients  had adequate access, through their
relationships with the Company, to information about the Registrant.
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
    (a) Exhibits
 
   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
 
      1.1  Form of Underwriting Agreement.**
      3.3  Fourth Amended and Restated Certificate of Incorporation of the Registrant.*
      3.5  Amended and Restated Bylaws of the Registrant.*
      4.1  Specimen Certificate of Common Stock.*
      4.2  Series E Preferred Stock Purchase Agreement, dated September 29, 1995, between the Registrant and
           certain purchasers of the Registrant's Series E Preferred Stock.*
      4.3  Certificate of Incorporation of the Registrant (included in Exhibit 3.3).*
      5.1  Opinion of Brobeck, Phleger & Harrison LLP.**
     10.1  Form of Warrant Issued In Connection with the Sale of the Registrant's Series A Preferred Stock on
           January 6, 1993.*
     10.2  Form of Warrant Issued In Connection with the Sale of the Registrant's Series B Preferred Stock on
           October 5, 1993.*
     10.3  Form of Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred Stock on March
           16, 1994.*
     10.4  Form of Performance Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred
           Stock on March 16, 1994 and May 4, 1994.*
   10.4.1  Form of Amendment to Warrants and Performance Warrants.*
     10.5  Warrant Issued in Connection with the Sale of the Registrant's Series E Preferred Stock on September 29,
           1995.*
     10.6  Restricted Stock Issuance Agreement, dated May 19, 1995, between the Registrant, Donald Green and
           Maureen Green.*
     10.7  Compensation Agreement, dated May 19, 1995, between the Registrant and Donald Green.*
     10.8  Promissory Note Secured by Pledge Agreement, dated May 31, 1995, by Donald Green in favor of the
           Registrant.*
     10.9  Stock Pledge Agreement, dated June 16, 1995, between the Registrant and Donald Green.*
    10.10  Promissory Note issued by Carl Grivner, dated October 5, 1995, in favor of the Registrant.*
    10.11  Shareholder and Joint Venture Agreement, dated December 28, 1995, between the Registrant and Harris
           Corporation, acting for the purposes of the agreement through its Digital Telephone Systems Division.*+
    10.12  Joint Venture & Partnership Agreement, dated April 11, 1994, between the Registrant and Tellabs
           Operations, Inc.*+
    10.13  License, Joint Development, Supply and Authorized Manufacturing Agreement, dated September 25, 1992,
           between the Registrant and Industrial Technology Research Institute of the Republic of China.*+
    10.14  Hangzhou Aftek Communication Registrant Ltd. Contract, dated June 18, 1994, between Advanced Fibre
           Technology Communication (Hong Kong) Limited and Hangzhou Communication Equipment Factory of the MPT.,
           HuaTong Branch.*+
</TABLE>
    
 
                                      II-3
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
    10.15  1445 & 1455 McDowell Boulevard North Net Lease, dated February 1, 1993, between the Registrant and G &
           W/ Redwood Associates Joint Venture, for the premises located at 1445 McDowell Boulevard North.*
    10.16  Redwood Business Park Net Lease, dated July 9, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1455 McDowell Boulevard North.*
    10.17  Redwood Business Park Net Lease, dated July 10, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1440 McDowell Boulevard North.*
    10.18  Redwood Business Park Net Lease, dated June 3, 1996, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at Buildings 1 & 9 of Willowbrook Court.*
    10.19  Second Amended and Restated Loan and Security Agreement, dated December 7, 1995, between the Registrant
           and Bank of the West.*
    10.20  Form of Indemnification Agreement for Executive Officers and Directors of the Registrant.*
    10.21  The Registrant's 1993 Stock Option/Stock Issuance Plan as amended (the ``1993 Plan").*
    10.22  Form of Stock Option Agreement pertaining to the 1993 Plan.*
    10.23  Form of Notice of Grant of Stock Option pertaining to the 1993 Plan.*
    10.24  Form of Stock Purchase Agreement pertaining to the 1993 Plan.*
    10.25  The Registrant's 1996 Stock Incentive Plan (the ``1996 Plan").*
    10.26  Form of Stock Option Agreement pertaining to the 1996 Plan.*
  10.26.1  Form of Automatic Stock Option Agreement pertaining to the 1996 Plan.*
    10.27  Form of Notice of Grant of Stock Option pertaining to the 1996 Plan.*
  10.27.1  Form of Notice of Grant of Non-Employee Director Automatic Stock Option pertaining to the 1996 Plan.*
    10.28  Form of Stock Issuance Agreement pertaining to the 1996 Plan.*
    10.29  The Registrant's Employee Stock Purchase Plan.*
    10.30  Termination Agreement of Joint Venture and Partnership Agreement, dated December 23, 1996, between the
           Registrant and Tellabs Operations, Inc.**
    10.31  License and Marketing Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations,
           Inc.
    10.32  OEM Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations, Inc.**
     11.1  Statement regarding computation of per share earnings.**
     21.1  Subsidiaries of the Registrant.*
     23.1  Consent of KPMG Peat Marwick LLP, Independent Auditors.**
     23.2  Consent of Brobeck, Phleger & Harrison LLP (included in Exhibit 5.1).**
     24.1  Power of Attorney (see page II-6).**
     27.1  Financial Data Schedule.**
</TABLE>
    
 
- ---------
*   Incorporated  by reference from the  Registrant's Registration Statement  on
    Form S-1 (no. 333-8921) filed with the Securities and Exchange Commission on
    July 26, 1996, as amended, and declared effective September 30, 1996.
 
   
**  Previously filed.
    
 
   
+   Portions of this Exhibit have been granted Confidential Treatment.
    
 
   
    (b)  Financial Statement Schedules
    
 
   
         None.
    
 
                                      II-4
<PAGE>
ITEM 17. UNDERTAKINGS
 
    The  undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing  specified in  the Underwriting Agreement,  certificates in  such
denominations  and registered in  such names as required  by the Underwriters to
permit prompt delivery to each purchaser.
 
    Insofar as indemnification for liabilities arising under the Securities  Act
may  be  permitted  to  directors,  officers  and  controlling  persons  of  the
Registrant pursuant to the Delaware General Corporation Law, the certificate  of
incorporation  or the  bylaws of Registrant,  Indemnification Agreements entered
into between  the Registrant  and its  directors and  certain of  its  officers,
Underwriting  Agreement, or otherwise,  the Registrant has  been advised that in
the opinion of the  Securities and Exchange  Commission such indemnification  is
against  public policy  as expressed in  the Securities Act,  and is, therefore,
unenforceable. In  the  event that  a  claim for  indemnification  against  such
liabilities  (other than the  payment by the Registrant  of expenses incurred or
paid by  a director,  officer or  controlling person  of the  Registrant in  the
successful  defense  of any  action,  suit or  proceeding)  is asserted  by such
director, officer or controlling person in connection with the securities  being
registered  hereunder, the Registrant will, unless in the opinion of its counsel
the matter  has been  settled by  controlling precedent,  submit to  a court  of
appropriate  jurisdiction  the question  whether such  indemnification by  it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.
 
    The undersigned Registrant hereby undertakes that:
 
        (1) For purposes of determining any liability under the Securities  Act,
    the  information omitted from the  form of Prospectus filed  as part of this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    Prospectus filed by  the Registrant  pursuant to  Rule 424(b)(1)  or (4)  or
    497(h)  under  the  Securities  Act  shall be  deemed  to  be  part  of this
    Registration Statement as of the time it was declared effective.
 
        (2) For the purpose  of determining any  liability under the  Securities
    Act,  each post-effective amendment that contains a form of Prospectus shall
    be deemed to  be a  new Registration  Statement relating  to the  securities
    offered  therein, and the offering of such  securities at that time shall be
    deemed to be the initial BONA FIDE offering thereof.
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
   
    PURSUANT  TO THE REQUIREMENTS OF THE  SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS AMENDMENT NO. 2  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 10TH DAY OF FEBRUARY, 1997.
    
 
                                       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.  2 TO REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED:
    
 
   
<TABLE>
<CAPTION>
               SIGNATURE                                         TITLE                                    DATE
- ---------------------------------------  ------------------------------------------------------  ----------------------
 
<C>                                      <S>                                                     <C>
           /s/ DONALD GREEN*
    -------------------------------      Chairman of the Board and Chief Executive Officer         February 10, 1997
             Donald Green                 (principal executive officer)
 
         /s/ CARL J. GRIVNER*
    -------------------------------      President, Chief Operating Officer and Director           February 10, 1997
            Carl J. Grivner
 
          /s/ DAN E. STEIMLE             Vice President, Chief Financial Officer, Treasurer and
    -------------------------------       Secretary (principal financial and accounting            February 10, 1997
            Dan E. Steimle                officer)
 
           /s/ B.J. CASSIN*
    -------------------------------      Director                                                  February 10, 1997
              B.J. Cassin
 
      /s/ CLIFFORD H. HIGGERSON*
    -------------------------------      Director                                                  February 10, 1997
         Clifford H. Higgerson
 
          /s/ BRIAN JACKMAN*
    -------------------------------      Director                                                  February 10, 1997
             Brian Jackman
 
            /s/ DAN RASDAL*
    -------------------------------      Director                                                  February 10, 1997
              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.**
      3.3  Fourth Amended and Restated Certificate of Incorporation of the Registrant.*
      3.5  Amended and Restated Bylaws of the Registrant.*
      4.1  Specimen Certificate of Common Stock.*
      4.2  Series E Preferred Stock Purchase Agreement, dated September 29, 1995, between the Registrant and
           certain purchasers of the Registrant's Series E Preferred Stock.*
      4.3  Certificate of Incorporation of the Registrant (included in Exhibit 3.3).*
      5.1  Opinion of Brobeck, Phleger & Harrison LLP.**
     10.1  Form of Warrant Issued In Connection with the Sale of the Registrant's Series A Preferred Stock on
           January 6, 1993.*
     10.2  Form of Warrant Issued In Connection with the Sale of the Registrant's Series B Preferred Stock on
           October 5, 1993.*
     10.3  Form of Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred Stock on March
           16, 1994.*
     10.4  Form of Performance Warrant Issued in Connection with the Sale of the Registrant's Series C Preferred
           Stock on March 16, 1994 and May 4, 1994.*
   10.4.1  Form of Amendment to Warrants and Performance Warrants.*
     10.5  Warrant Issued in Connection with the Sale of the Registrant's Series E Preferred Stock on September 29,
           1995.*
     10.6  Restricted Stock Issuance Agreement, dated May 19, 1995, between the Registrant, Donald Green and
           Maureen Green.*
     10.7  Compensation Agreement, dated May 19, 1995, between the Registrant and Donald Green.*
     10.8  Promissory Note Secured by Pledge Agreement, dated May 31, 1995, by Donald Green in favor of the
           Registrant.*
     10.9  Stock Pledge Agreement, dated June 16, 1995, between the Registrant and Donald Green.*
    10.10  Promissory Note issued by Carl Grivner, dated October 5, 1995, in favor of the Registrant.*
    10.11  Shareholder and Joint Venture Agreement, dated December 28, 1995, between the Registrant and Harris
           Corporation, acting for the purposes of the agreement through its Digital Telephone Systems Division.*+
    10.12  Joint Venture & Partnership Agreement, dated April 11, 1994, between the Registrant and Tellabs
           Operations, Inc.*+
    10.13  License, Joint Development, Supply and Authorized Manufacturing Agreement, dated September 25, 1992,
           between the Registrant and Industrial Technology Research Institute of the Republic of China.*+
    10.14  Hangzhou Aftek Communication Registrant Ltd. Contract, dated June 18, 1994, between Advanced Fibre
           Technology Communication (Hong Kong) Limited and Hangzhou Communication Equipment Factory of the MPT.,
           HuaTong Branch.*+
    10.15  1445 & 1455 McDowell Boulevard North Net Lease, dated February 1, 1993, between the Registrant and G &
           W/ Redwood Associates Joint Venture, for the premises located at 1445 McDowell Boulevard North.*
    10.16  Redwood Business Park Net Lease, dated July 9, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1455 McDowell Boulevard North.*
    10.17  Redwood Business Park Net Lease, dated July 10, 1995, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at 1440 McDowell Boulevard North.*
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                              DOCUMENT DESCRIPTION
- ---------  --------------------------------------------------------------------------------------------------------
<C>        <S>
    10.18  Redwood Business Park Net Lease, dated June 3, 1996, between the Registrant and G & W/ Redwood
           Associates Joint Venture, for the premises located at Buildings 1 & 9 of Willowbrook Court.*
    10.19  Second Amended and Restated Loan and Security Agreement, dated December 7, 1995, between the Registrant
           and Bank of the West.*
    10.20  Form of Indemnification Agreement for Executive Officers and Directors of the Registrant.*
    10.21  The Registrant's 1993 Stock Option/Stock Issuance Plan as amended (the ``1993 Plan").*
    10.22  Form of Stock Option Agreement pertaining to the 1993 Plan.*
    10.23  Form of Notice of Grant of Stock Option pertaining to the 1993 Plan.*
    10.24  Form of Stock Purchase Agreement pertaining to the 1993 Plan.*
    10.25  The Registrant's 1996 Stock Incentive Plan (the ``1996 Plan").*
    10.26  Form of Stock Option Agreement pertaining to the 1996 Plan.*
  10.26.1  Form of Automatic Stock Option Agreement pertaining to the 1996 Plan.*
    10.27  Form of Notice of Grant of Stock Option pertaining to the 1996 Plan.*
  10.27.1  Form of Notice of Grant of Non-Employee Director Automatic Stock Option pertaining to the 1996 Plan.*
    10.28  Form of Stock Issuance Agreement pertaining to the 1996 Plan.*
    10.29  The Registrant's Employee Stock Purchase Plan.*
    10.30  Termination Agreement of Joint Venture and Partnership Agreement, dated December 23, 1996, between the
           Registrant and Tellabs Operations, Inc.**
    10.31  License and Marketing Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations,
           Inc.
    10.32  OEM Agreement, dated December 23, 1996, between the Registrant and Tellabs Operations, Inc.**
     11.1  Statement regarding computation of per share earnings.**
     21.1  Subsidiaries of the Registrant.*
     23.1  Consent of KPMG Peat Marwick LLP, Independent Auditors.**
     23.2  Consent of Brobeck, Phleger & Harrison LLP (included in Exhibit 5.1).**
     24.1  Power of Attorney (see page II-6).**
     27.1  Financial Data Schedule.**
</TABLE>
    
 
- ---------
*    Incorporated  by reference from the  Registrant's Registration Statement on
    Form S-1 (no. 333-8921) filed with the Securities and Exchange Commission on
    July 26, 1996, as amended, and declared effective September 30, 1996.
 
   
**  Previously filed.
    
 
   
+   Portions of this Exhibit have been granted Confidential Treatment.
    
 
   
    (b)  Financial Statement Schedules
    
 
   
         None.
    


<PAGE>


                                                                 Exhibit 10.31



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



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


                                    RECITALS


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

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

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

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

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

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


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<PAGE>


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

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

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


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


1.   DEFINITIONS


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


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


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<PAGE>


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


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

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

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

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


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

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

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

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


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12/23/96                                                           Page 3 of 42

<PAGE>

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

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

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

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

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

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

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


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12/23/96                                                           Page 4 of 42

<PAGE>

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

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

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

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

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

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

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


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12/23/96                                                           Page 5 of 42

<PAGE>

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

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

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

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

- --------------------------------------------------------------------------------
                                                                    PAGE 6 OF 42

<PAGE>

intellectual property and proprietary rights therein anywhere in the world.


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

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

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

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

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

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

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

- --------------------------------------------------------------------------------
                                                                    PAGE 7 OF 42

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

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

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

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

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

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

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

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                                                                    PAGE 8 OF 42

<PAGE>

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


3.   UMC 1000 FUTURE DEVELOPMENTS

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

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

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

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

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                                                                    PAGE 9 OF 42

<PAGE>

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

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

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

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

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

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                                                                   PAGE 10 OF 42

<PAGE>

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

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

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


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                                                                  PAGE 11 OF 42

<PAGE>

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

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

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


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


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                                                                  PAGE 12 OF 42

<PAGE>

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

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

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

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


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

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


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                                                                  PAGE 13 OF 42


<PAGE>

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

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

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


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                                                                  PAGE 14 OF 42

<PAGE>

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

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

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

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


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                                                                  PAGE 15 OF 42

<PAGE>

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

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

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

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


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                                                                   PAGE 16 OF 42

<PAGE>

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

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

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

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


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                                                                   PAGE 17 OF 42

<PAGE>

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

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

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

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


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                                                                   PAGE 18 OF 42

<PAGE>

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

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

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

             a.     Six percent (6%) of Net Revenue 
                    from shelves/assemblies, DLP, T1X, E1X, L-PSU, ELU, 
                    EBC, and CPU UMC 1000 Products manufactured by Tellabs 
                    until cumulative Net Revenue of all UMC 1000 Products 
                    and all Tellabs Developments sold by Tellabs since 
                    April 1, 1996, reach $100 million.

             b.     After cumulative Net Revenue for 
                    all UMC 1000 Products and all Tellabs Developments sold 
                    by Tellabs since April 1, 1996, exceeds $100 million, 
                    the royalty will be twelve percent (12%) of the greater 
                    of either: (i) Net Revenue or (ii) Tellabs' list price 
                    less thirty-five percent (35%) for CBA(s), DLP, T1X, 
                    E1X, L-PSU, ELU, EBC, and CPU UMC 1000 Products 
                    manufactured by Tellabs.


             c.     Tellabs will pay AFC a royalty 
                    equal to fifteen percent (15%) of the greater of 
                    either: (i) Net Revenue or (ii) Tellabs' list price 
                    less thirty-five percent (35%), for 
                    Tellabs-manufactured UMC 1000 Products containing 
                    Wireless Enhancements.
                    
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                                                                   PAGE 19 OF 42

<PAGE>

             d.     Two percent (2%) of Net Revenue for 
                    all Tellabs Developments that are sold by Tellabs to 
                    AT&T; otherwise, no royalties are due for any other 
                    sales by Tellabs of Tellabs Developments.
                    
             e.     For all other UMC 1000 Products 
                    manufactured by Tellabs hereunder (other than the 
                    Wireless Enhancements and the products referred to in 
                    sub-sections a., b., and c. above), the royalty will be 
                    twelve percent (12%) of the greater of either: (i) Net 
                    Revenue or (ii) Tellabs' published list price (existing 
                    on the Effective Date) less thirty-five percent (35%) 
                    of such other UMC 1000 Products (regardless of 
                    CableSpan sales volumes).


     6.2     AFC'S ROYALTY OBLIGATIONS. AFC agrees to pay 
             Tellabs a royalty of twelve percent (12%) of the greater of: 
             (i) Net Revenue or (ii) AFC's published list price of the AFC 
             version of the Tellabs Developments less thirty-five percent 
             (35%), for all Tellabs Developments manufactured by AFC or its 
             subcontractors. If AFC acquires or develops any RF coax 
             transceiver and/or any one to twelve line product with 
             integrated RF coax transceivers for sale into an AFC exclusive 
             market, then AFC will pay Tellabs a royalty equal to two 
             percent (2%) of the greater of: (i) Net Revenue or (ii) the AFC 
             published list price (existing on the Effective Date) less 
             thirty-five percent (35%) of the competing product elements for 
             sales by AFC of the competing product in AFC's exclusive 
             markets. The royalties payable pursuant to this section shall 
             continue as long as Tellabs is precluded from selling the 
             Tellabs Developments into AFC's exclusive markets.

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

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


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                                                                   PAGE 20 OF 42

<PAGE>

7.   MARKET RIGHTS
     7.1     DOMESTIC MARKETING RIGHTS.

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

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

                    Exceptions to this Tellabs exclusive market right are:

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


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                                                                  PAGE 21 OF 42

<PAGE>

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

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

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

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                                                                  PAGE 22 OF 42


<PAGE>

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

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

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

     7.2     INTERNATIONAL MARKETING RIGHTS.

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

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


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                                                                  PAGE 23 OF 42

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

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

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

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<PAGE>

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

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

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

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

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


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                                                                  PAGE 25 OF 42

<PAGE>

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

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

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

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


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                                                                   PAGE 26 OF 42

<PAGE>

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

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

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


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                                                                   PAGE 27 OF 42

<PAGE>

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

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

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

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                                                                   PAGE 28 OF 42

<PAGE>

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

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

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


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                                                                   PAGE 29 OF 42

<PAGE>

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


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


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                                                                   PAGE 30 OF 42

<PAGE>

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

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

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


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                                                                   PAGE 31 OF 42


<PAGE>

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

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

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

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

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


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                                                                   PAGE 32 OF 42


<PAGE>

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

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

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


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


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                                                                   PAGE 33 OF 42

<PAGE>

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



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


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

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

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

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


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                                                                   PAGE 34 OF 42

<PAGE>

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

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

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

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

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

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



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<PAGE>

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

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

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

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

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

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

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<PAGE>

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

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

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

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

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

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

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

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

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

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

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

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

<PAGE>

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

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

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

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

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

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

<PAGE>

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

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

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

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

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

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

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

<PAGE>

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

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

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

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

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

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

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


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


ADVANCED FIBRE COMMUNICATIONS, INC.     TELLABS OPERATIONS, INC.

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




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                                                                   PAGE 42 of 42
<PAGE>

                                      TELLABS CONTRACT NO. CON AFC 009 LIC 96 09


                                  Attachment A

                            MANUFACTURING INFORMATION


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

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




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

<PAGE>


                                  Attachment B

                      AFC CURRENT STANDARD VOLUME DISCOUNTS

UMC 1000 VOLUME DISCOUNT INFORMATION

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

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

Amount in U.S. Dollars                  Discount Percentage *

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

Greater discounts may be negotiated with your AFC regional Sales Manager





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

<PAGE>


                            Tellabs Volume Discounts

CABLESPAN Volume Discount Information:

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

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

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


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

<PAGE>


                                  Attachment C

                               "CAP" Customer List


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


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

<PAGE>

                                  Attachment D


                 TELLABS "ALTERNATE PROVIDER HOLDING COMPANIES"


                                     [NONE]


- -------------------------------------------------------------------------------
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<PAGE>

                                  Attachment E


             EXISTING AFC AGREEMENTS - AFC RESERVED MARKETING RIGHTS


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

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

Section 6.1 of the J.V. Agreement:

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

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

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


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

<PAGE>

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

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

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

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

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

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

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


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

<PAGE>

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


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12/23/96




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