CASCADE COMMUNICATIONS CORP
DEF 14A, 1997-04-04
COMPUTER COMMUNICATIONS EQUIPMENT
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                             SCHEDULE 14A


                INFORMATION REQUIRED IN PROXY STATEMENT

                      SCHEDULE 14A INFORMATION

                PROXY STATEMENT PURSUANT TO SECTION 14(A)
              OF THE SECURITIES EXCHANGE ACT OF 1934

Filed by the  registrant    [X]
Filed by a party other than the registrant [ ]
Check the appropriate box:

[ ]       Preliminary proxy statement 
[ ]       Confidential, for use of the Commission only (as permitted by 
          Rule 14a-6(e)(2))
[X]       Definitive proxy materials
[ ]       Definitive additional materials
[ ]       Soliciting material pursuant to Rule 14a-11(c) or Rule 14a-12



                       CASCADE COMMUNICATIONS CORP.
           (Name of Registrant as Specified in Its Charter)


      (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of filing fee (Check the appropriate box):

[X]      No fee required.
[ ]      Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 
          0-11.

    (1)  Title of each class of securities to which transaction applies:

    (2)  Aggregate number of securities to which transaction applies:

    (3)  Per unit price or other underlying value of transaction computed 
         pursuant to Exchange Act Rule 0-11 (set Forth the amount on which 
         filing fee is calculated and state how it was determined):

    (4)  Proposed maximum aggregate value of transaction:

    (5)  Total fee paid:

[ ]      Fee paid previously with preliminary materials:

[ ]      Check box if any part of the fee is offset as provided by Exchange Act
         Rule 0-11 (a) (2) and identify the filing for which the offsetting fee
         was paid previously.  Identify the previous filing by registration 
         statement number, or the form or schedule and the date of its filing.

         (1)      Amount previously paid:

         (2)      Form, Schedule or Registration Statement no.:

         (3)      Filing Party:

         (4)      Date Filed:



<PAGE>
                                                           

                          CASCADE COMMUNICATIONS CORP.
                                   5 Carlisle Road
                            Westford, Massachusetts 01886
                                    ---------------

                      NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                                    ---------------

To the Stockholders:

         The Annual Meeting of Stockholders of Cascade  Communications  Corp., a
Delaware corporation (the "Corporation"),  will be held on Thursday, May 1, 1997
(the "Annual  Meeting") at 9:30 A.M.,  local time, at The Omni Parker House,  60
School  Street,  Boston,  Massachusetts  02108,  to  consider  and act  upon the
following matters:

1.     To elect three members to the Board of Directors to serve for three-year
       terms as Class I Directors.

2.     To approve amendments to the Corporation's 1994 Non-Employee Director 
       Stock Option Plan (the "Director Plan") to (i) amend the initial stock 
       option grant from 90,000 shares to 30,000 shares for non-employee
       Directors first elected after the Annual Meeting; (ii) to amend the 
       stock option grant for each subsequent year of service on the Board of 
       Directors from 12,000 to 10,000 shares for all non-employee Directors 
       following the Annual Meeting; (iii) to limit the number of shares 
       granted for each initial stock option grant and the stock option grant 
       for each subsequent year of service on the Board of Directors to the 
       amount stated above effective after the Annual Meeting; and (iv) to 
       increase the number of shares of Common Stock available for issuance 
       under the Director Plan from 720,000 shares to 870,000 shares.

3.     To  approve  an  amendment  to the  Corporation's  Amended  and  Restated
       Certificate of  Incorporation  increasing from 225,000,000 to 300,000,000
       the number of  authorized  shares of Common  Stock,  par value  $.001 per
       share, of the Corporation.

4.     To ratify the selection of Coopers & Lybrand L.L.P. as auditors for the 
       fiscal year ending December 31,1997.

5.     To transact such other business as may properly come before the meeting 
       or any adjournments thereof.

       Stockholders  entitled to notice of and to vote at the  meeting  shall be
determined as of March 19, 1997, the record date fixed by the Board of Directors
for such purpose.

                                 By Order of the Board of Directors,


                                 Paul E. Blondin
                                 Secretary
Mail Date:  April 4, 1997

WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING,  PLEASE  COMPLETE,  DATE AND SIGN
THE ENCLOSED PROXY CARD AND MAIL IT PROMPTLY IN THE ENCLOSED STAMPED ENVELOPE IN
ORDER TO ASSURE REPRESENTATION OF YOUR SHARES AT THE MEETING. NO POSTAGE NEED BE
AFFIXED IF THE PROXY IS MAILED IN THE UNITED STATES.


<PAGE>








                          CASCADE COMMUNICATIONS CORP.
                                 5 Carlisle Road
                          Westford, Massachusetts 01886
                        ----------------------------------

                                 PROXY STATEMENT
                        -----------------------------------

                                  APRIL 4, 1997


         This Proxy Statement is furnished in connection  with the  solicitation
of  proxies  by the Board of  Directors  of Cascade  Communications  Corp.  (the
"Corporation")  for use at the  Annual  Meeting  of  Stockholders  to be held on
Thursday,  May 1, 1997 (the "Annual  Meeting") at 9:30 A.M.,  local time, at The
Omni Parker  House,  60 School  Street,  Boston,  Massachusetts  02108,  and any
adjournments thereof.

         Only  stockholders  of record as of March 19, 1997 (the "Record  Date")
will be entitled to vote at the meeting and any adjournments thereof. As of that
date,  94,301,202 shares of common  stock,  $.001 par value  (the  "Common
Stock"),  of the Corporation were issued and outstanding.  The holders of Common
Stock are entitled to one vote per share on any proposal presented at the Annual
Meeting.  Stockholders may vote in person or by proxy. Execution of a proxy will
not in any way affect a  stockholder's  right to attend the Annual  Meeting  and
vote in person.  Any proxy may be revoked by a stockholder at any time before it
is exercised by delivery of a written  revocation or a later  executed  proxy to
the Secretary of the Corporation.

         An Annual Report to Stockholders,  containing  financial statements for
the fiscal year ended  December 31, 1996,  is being  mailed  together  with this
Proxy Statement to all  stockholders  entitled to vote. This Proxy Statement and
the form of proxy were first mailed to stockholders on or about April 4, 1997.

Voting Securities and Votes Required

         The  representation in person or by proxy of at least a majority of the
outstanding  shares of Common Stock entitled to vote at the meeting is necessary
to constitute a quorum for the transaction of business.  Votes withheld from any
nominee for election as director, abstentions and broker "non-votes" are counted
as present or represented for purposes of determining the presence or absence of
a quorum for the meeting.  A "non-vote" occurs when a nominee holding shares for
a beneficial owner votes on one proposal,  but does not vote on another proposal
because,  in  respect  of  such  other  proposal,  the  nominee  does  not  have
discretionary voting power and has not received instructions from the beneficial
owner.

         In the election of directors, the nominees receiving the highest number
of affirmative  votes of the shares present or represented  and entitled to vote
at the  meeting  shall be  elected  as  directors.  On all other  matters  being
submitted  to  stockholders,  an  affirmative  vote of a majority  of the shares
present or represented  and voting on each such matter is required for approval,
except  that the  proposal  to amend  the  Corporation's  Amended  and  Restated
Certificate of Incorporation  requires the affirmative vote of a majority of the
outstanding shares of Common Stock entitled to vote at the meeting. An automated
system administered by the Corporation's transfer agent tabulates the votes. The
vote  on  each  matter  submitted  to  stockholders  is  tabulated   separately.
Abstentions  are  included in the number of shares  present or  represented  and
voting on each matter.  Abstentions  and broker  "non-votes"  have the practical
effect of a vote "against" the proposal to amend the  Corporation's  Amended and
Restated Certificate of Incorporation.  On all other matters, broker "non-votes"
are not  considered  to have been voted for the  particular  matter and have the
practical effect of reducing the number of affirmative votes required to achieve
a majority for such matter by reducing the total number of shares from which the
majority is calculated.

         The persons  named as  attorneys  in the  proxies  are  officers of the
Corporation. All properly executed proxies returned in time to be counted at the
meeting will be voted. Any stockholder  giving a proxy has the right to withhold
authority  to vote for any  individual  nominee  to the  Board of  Directors  by
writing that nominee's  name in the space provided on the proxy.  In addition to
the  election  of  directors,  the  stockholders  will  consider  and vote  upon
proposals to amend the  Corporation's  1994  Non-Employee  Director Stock Option
Plan,  to  amend  the   Corporation's   Amended  and  Restated   Certificate  of
Incorporation and to ratify the selection of auditors,  all as further described
in this  Proxy  Statement.  All  proxies  will be voted in  accordance  with the
instructions contained therein, and if no choice is specified,  the proxies will
be voted in  favor of the  matters  set  forth  in the  accompanying  Notice  of
Meeting.

         The Board of Directors of the Corporation  knows of no other matters to
be  presented at the  meeting.  If any other  matter  should be presented at the
meeting  upon which a vote  properly  may be taken,  shares  represented  by all
proxies received by the Board of Directors will be voted with respect thereto in
accordance with the judgment of the persons named as attorneys in the proxies.

Adjustments for Stock Splits

         All share and per share  information  in this Proxy  Statement has been
adjusted as of each date given to reflect the following stock splits in the form
of stock  dividends;  (i) a two-for-one in June 1995;  (ii) a  three-for-two  in
February 1996; and (iii) a two-for-one in May 1996.

             STOCK OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         The following table sets forth certain information,  as of February 20,
1997, with respect to beneficial ownership of the Corporation's Common Stock by:
(i) each person who, to the  knowledge of the  Corporation,  beneficially  owned
more than 5% of the shares of Common  Stock  outstanding  as of such date;  (ii)
each director or nominee for director;  (iii) each executive officer  identified
in  the   Summary   Compensation   Table  set  forth  below  under  the  heading
"Compensation and Other Information Concerning Directors and Officers," and (iv)
all directors, nominees and executive officers as a group.


<TABLE>

                                             Amount and     Percentage of Common
                                             Nature of       Stock
Name and Address of Beneficial Owner         Ownership(1)   Outstanding (2)
- ----------------------------------------    ------------   ---------------------
<S>                                          <C>               <C>
5% Stockholders

Putnam Investments, Inc...............       7,844,574 (3)       8.57%
One Post Office Square
Boston, MA  02109

American Century Mutual Funds, Inc...        7,033,000 (4)       7.68%
4500 Main Street, P.O. Box 418210
Kansas City, MO 64141-9210



Directors and Executive Officers

Victoria A. Brown.....................        240,000 (5)        *

Richard M. Burnes, Jr.................        173,278 (6)        *

Paul J. Ferri..........................       137,877 (7)        *

Bruns H. Grayson.......................       266,425 (8)        *

Steven C. Walske.......................        32,068 (9)        *

Daniel E. Smith........................     1,661,034 (10)       1.78%

Gururaj Deshpande......................       826,174 (11)       *

Paul E. Blondin........................       154,204 (12)       *

Michael A. Champa......................       146,574 (13)       *

Robert N. Machlin......................        62,426 (14)       *

All directors and executive officers 
as a group............................      4,425,742 (15)       4.71%
(14 persons)

- ------------------------
</TABLE>

*Less than 1% of the total number of outstanding shares of Common Stock.

(1)     Except as otherwise noted, each person or entity named in the table has
        sole voting and investment power with respect to the shares.

(2)     The number of shares of Common Stock deemed  outstanding on February 20,
        1997 includes (i) 91,528,185  shares of Common Stock outstanding on such
        date and (ii) all options that are currently  exercisable or will become
        exercisable  within 60 days of February  20, 1997 by the person or group
        in question.

(3)     Represents shares held by Putnam Investments,  Inc., which is the parent
        corporation  to  Putnam  Investment  Management,  Inc.  and  The  Putnam
        Advisory  Company,  Inc.,  two  investment  managers which are deemed to
        beneficially own an aggregate of 7,844,574  shares of the  Corporation's
        Common Stock.  Information  stated above was provided to the Corporation
        as of December 31, 1996.

(4)     Represents shares held by American Century Mutual Funds, Inc. ("ACMF").
        American Century Investment Management, Inc. ("ACIM"), a registered 
        investment advisor, is the investment manager of ACMF and ACIM is a 
        wholly-owned subsidiary of American Century Companies, Inc. ("ACC").   
        Mr. James E. Stowers, Jr. controls ACC by virtue of his beneficial 
        ownership of a majority of the voting stock of ACC.  Mr. Stowers, ACC 
        and ACIM disclaim beneficial ownership of such shares.  
        Information stated above was provided to the Corporation as of 
        January 15, 1997.

(5)     Consists of 240,000  shares of Common Stock  issuable  pursuant to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(6)     Includes  72,000  shares  of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(7)     Includes 60,046 shares of Common Stock held by Matrix Partners IV, L.P.
        and 5,006 shares of Common Stock held by Matrix IV Entrepreneurs Fund, 
        L.P.  Mr. Ferri is the general partner of Matrix IV Management Company,
        L.P. which is the general partner of Matrix Partners IV, L.P. and 
        Matrix IV Entrepreneurs Fund, L.P., and as such may be deemed to 
        beneficially own all shares of Common Stock held by such entities.
        Mr. Ferri disclaims beneficial ownership of the shares held by Matrix 
        Partners IV, L.P. and Matrix IV Entrepreneurs Fund, L.P. except to the
        extent of any pecuniary interest therein.  Also includes 72,000 shares
        of Common Stock issuable pursuant to stock options that are currently 
        exercisable or will become exercisable within 60 days of February 20, 
        1997.

(8)     Includes  27,000  shares  of Common  Stock  held by the  Grayson  Family
        Foundation which Mr. Grayson may be deemed the beneficial owner since he
        exercises voting and investment control over the shares as the President
        of the Foundation.  Mr. Grayson disclaims any pecuniary  interest in the
        shares held by the  Grayson  Family  Foundation.  Also  includes  72,000
        shares of Common  Stock  issuable  pursuant  to stock  options  that are
        currently  exercisable  or will  become  exercisable  within  60 days of
        February 20, 1997.

(9)     Includes  30,000  shares  of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(10)    Includes  1,559,934  shares of Common Stock  issuable  pursuant to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(11)    Includes  32,268  shares  of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(12)    Includes  75,704  shares  of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(13)    Includes  144,174  shares of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(14)    Includes  61,351  shares  of Common  Stock  issuable  pursuant  to stock
        options that are currently exercisable or will become exercisable within
        60 days of February 20, 1997.

(15)    Includes an  aggregate  of  2,516,549  shares of Common  Stock  issuable
        pursuant to stock options that are currently  exercisable or will become
        exercisable within 60 days of February 20, 1997.



                              ELECTION OF DIRECTORS

         In accordance with the Corporation's  Amended and Restated  Certificate
of  Incorporation,  the  Corporation's  Board of Directors is divided into three
classes.

         Two Class I Directors, Ms. Brown and Mr. Deshpande, were elected for 
three-year terms through a Written Consent of Stockholders in Lieu of a Special 
Meeting dated May 23, 1994.  One Class I Director, Mr. Walske, was elected for a
one-year term through a Unanimous Written Consent of Directors dated March 20,
1996.  The terms of Ms. Brown and Messrs. Deshpande  and  Walske  expire  on  
the  date  of the  1997  Annual  Meeting  of Stockholders.

         Two Class II Directors, Mr. Ferri and Mr. Smith, were elected for 
three-year terms at the Annual Meeting of Stockholders held on May 2, 1996.  The
terms of Messrs. Ferri and Smith expire on the date of the 1999 Annual Meeting 
of Stockholders.

         Two Class III Directors, Mr. Burnes and Mr. Grayson, were elected for
three-year terms at the Annual Meeting of Stockholders held on May 4, 1995.  
The terms of Messrs. Burnes and Grayson expire on the date of the 1998 Annual
Meeting of Stockholders.

         Three  Class I  Directors  will be  elected at this  Annual  Meeting of
Stockholders for three-year  terms. The Class I nominees,  Ms. Brown and Messrs.
Deshpande  and Walske,  are currently  serving as directors of the  Corporation.
Shares  represented  by all proxies  received by the Board of Directors  and not
marked to withhold  authority  to vote for Ms. Brown and Messrs.  Deshpande  and
Walske will be voted FOR the  election of all  nominees.  Ms.  Brown and Messrs.
Deshpande and Walske will be elected to hold office until the Annual  Meeting of
Stockholders to be held in 2000 and until their  respective  successors are duly
elected and qualified.  All of the nominees have indicated their  willingness to
serve, if elected; however, if any of the nominees should be unable or unwilling
to serve, the proxies will be voted for a substitute  nominee  designated by the
Board of Directors or for fixing the number of directors at a lesser number.

         The  following  table sets forth for each  nominee to be elected at the
Annual Meeting and for each director whose term of office will extend beyond the
Annual  Meeting,  the year each such  nominee or  director  was first  elected a
director,  the  positions  currently  held by each nominee or director  with the
Corporation,  the year each  nominee's  or  director's  term will expire and the
class of director of each nominee or director.

<TABLE>

Nominee's or Director's
Name and Year Nominee
or Director First                                Year Term              Class of
Became a Director           Position(s) Held     Will Expire            Director

<S>                         <C>                     <C>                  <C> 

Victoria A. Brown......     Director                 1997                    I
(1991)

Richard M. Burnes, Jr...    Director                 1998                  III
(1991)

Gururaj Deshpande......     Executive Vice 
(1990)                      President Business                      
                            Development and
                            Chairman of the Board 
                            of Directors             1997                    I

Paul J. Ferri.........      Director                 1999                   II
(1991)

Bruns H. Grayson......      Director                 1998                  III
(1993)

Daniel E. Smith........     President, Chief 
(1992)                      Executive Officer                           
                            and Director             1999                   II
 
Steven C. Walske.......     Director                 1997                    I
(1996)
</TABLE>

Board of Directors' Meetings and Committees

         The Board of  Directors  met 10 times  during  the  fiscal  year  ended
December 31, 1996.

         The Audit Committee of the Board of Directors,  presently  comprised of
Mr.  Burnes and Mr.  Grayson,  both outside  directors of the  Corporation,  was
established on April 29, 1994. The Audit Committee  provides the opportunity for
direct contact between the Corporation's  independent  accountants and the Board
of  Directors.  The Audit  Committee has  responsibility  for  recommending  the
appointment of the Corporation's  independent  accountants,  reviewing the scope
and  results of audits  and  reviewing  the  Corporation's  internal  accounting
control policies and procedures. During the fiscal year ended December 31, 1996,
the Audit Committee met twice.

         The  Compensation  Committee  of  the  Board  of  Directors,  presently
comprised of Ms. Brown and Mr. Ferri, both outside directors of the Corporation,
was established on April 29, 1994. The Compensation  Committee reviews and makes
recommendations concerning executive compensation, administers the Corporation's
Amended and Restated 1991 Stock Plan, Concert Communications 1995 Stock Option 
Plan, 1994 Employee Stock Purchase Plan and 1994 Non-Employee  Director Stock 
Option Plan and oversees the  administration of the Corporation's  401(k) plan.
During the fiscal year ended December 31, 1996, the Compensation  Committee  
met four times,  and took action by  unanimous  written consent thirteen times.

         The Board of Directors does not currently have a nominating  committee.
In 1996,  each of the  directors  attended  at least 75% of the total  number of
meetings of the Board of Directors  and all  Committees of the Board on which he
or she served.

                 OCCUPATIONS OF DIRECTORS AND EXECUTIVE OFFICERS

         The  following  table sets forth the Class I nominees  to be elected at
the  meeting,  the current  directors  who will  continue to serve as  directors
beyond the meeting,  and the executive officers of the Corporation,  their ages,
and the  positions  currently  held by each such  person  with the  Corporation.
Information  with respect to the number of shares of Common  Stock  beneficially
owned by each director, directly or indirectly, as of February 20, 1997, appears
under the heading "Stock Ownership of Certain Beneficial Owners and Management."

<TABLE>

Name                                                 Age    Position

<S>                                                  <C>    <C>
Victoria A. Brown...............................     49     Director

Richard M. Burnes, Jr...........................     55     Director

Gururaj Deshpande...............................     46     Executive Vice 
                                                            President of 
                                                            Business Development
                                                            and Chairman of the
                                                            Board of Directors

Paul J. Ferri...................................     58     Director

Bruns H. Grayson................................     49     Director

Daniel E. Smith.................................     47     President, Chief 
                                                            Executive Officer 
                                                            and Director

Steven C. Walske................................     45     Director

Hassan M. Ahmed.................................     39     Vice President of 
                                                            Engineering

Paul E. Blondin.................................     46     Vice President of 
                                                            Finance and 
                                                            Administration, 
                                                            Chief Financial 
                                                            Officer, Treasurer
                                                            and Secretary

Michael A. Champa...............................     45     Vice President of 
                                                            Worldwide Sales and 
                                                            Customer Service

James A. Dolce, Jr..............................     34     Vice President and 
                                                            General Manager of
                                                            Remote Access

John E. Dowling.................................     43     Vice President of 
                                                            Operations

Robert N. Machlin...............................     39     Vice President of 
                                                            Marketing

Jonathan M. Reeves..............................     37     Vice President 
                                                            and General Manager
                                                            of Broadband Access
</TABLE>

Directors to be Elected at the Meeting

Victoria A. Brown has been a director of the Corporation since November 1991 and
served as  Chairperson  of the Board of Directors  from November 1991 to January
1997. Ms. Brown has been President of Communicore,  a consulting company,  since
1991.  Prior to that time,  Ms. Brown was  President  of Timeplex,  Inc., a data
communications  equipment  manufacturer  and a subsidiary of Unisys Corp.,  from
1988 to 1990.

Gururaj  Deshpande is a founder of the  Corporation and has served as a director
of the Corporation since inception and as Chairman of the Board of Directors and
Executive  Vice  President  of Business  Development  of the  Corporation  since
January 1997. From April 1992 to January 1997, Mr. Deshpande served as Executive
Vice  President of Marketing and Customer  Service of the  Corporation  and from
October  1990 to April  1992,  served  as  President  of the  Corporation.  From
December 1988 to May 1990, Mr. Deshpande served as Vice President of Engineering
for Coral Network  Corporation,  a designer and manufacturer of high performance
LAN internetworking products.

Steven C. Walske has been a director of the Corporation since March 1996.  
Since August 1994, Mr. Walske has served as Chairman of the Board of Directors 
of Parametric Technology Corporation, a developer of software products for the
automation of the mechanical design process, and Chief Executive Officer of 
Parametric Technology Corporation since December 1986.  Mr. Walske served as 
President of Parametric Technology Corporation from December 1986 to August 
1994. Mr. Walske also serves on the Board of Directors of Synopsys, Inc., 
VideoServer, Inc. and Object Design, Inc.


Directors Whose Terms Extend Beyond the Meeting

Richard M. Burnes, Jr. has been a director of the Corporation since June 1991. 
Since 1970, he has been a General Partner of The Charles River Partnerships, a 
group of venture capital funds based in Waltham, Massachusetts.  Mr. Burnes is 
also a director of CellCall, Inc., LANart Corporation, Concord Communications, 
Passport Corporation and Prominet Corporation.

Bruns H. Grayson has been a director of the Corporation since October 1993.  
Since September 1987, Mr. Grayson has served as the Managing General Partner 
of Calvert Capital L.P., a partnership that manages the investment activities of
the ABS Ventures partnerships.  Mr. Grayson is also a director of Anadigics, 
Inc.

Paul J. Ferri has been a director of the Corporation since June 1991.  He has 
served as a General Partner of Matrix Partners, a venture capital firm, since 
February 1982.  Mr. Ferri also serves on the Board of Directors of Stratus
Computer Inc., Applix Inc., BancTec, Inc., TechForce Corp. and VideoServer, Inc.

Daniel E. Smith has served as President, Chief Executive Officer and Director of
the  Corporation  since April 1992. From August 1987 until April 1992, Mr. Smith
served as Vice  President of Sales for Proteon,  Inc., a producer of LAN and LAN
internetworking  products.  Prior to that time,  Mr.  Smith spent seven years at
Rolm  Corporation,  a manufacturer  of  telecommunications  systems,  in several
positions,  most recently General Manager, Named Accounts Program Division, that
corporation's sales division for certain major accounts.

Executive Officers

Dr.  Hassan  M.  Ahmed  has  served  as Vice  President  of  Engineering  of the
Corporation  since  December  1995.  From July 1995 to December  1995, Dr. Ahmed
served as Vice President and Chief Technology Officer of the Corporation.  Prior
to that time,  Dr. Ahmed was  President of  AirAccess,  an emerging  high-speed,
wireless LAN company from June 1993 to June 1995 and he worked as an independent
consultant to technology companies such as Motorola,  Inc., Telco Systems, Inc.,
and Windata,  Inc.  from  September  1987 to June 1993.  In addition,  he was an
associate professor at Boston University's  Electrical  Engineering and Computer
Science and Systems  Engineering  Departments  from  September 1987 to September
1992.

Paul E.  Blondin has served as Vice  President  of Finance  and  Administration,
Chief Financial  Officer and Treasurer of the  Corporation  since March 1993 and
assumed the office of Secretary  in May 1994.  Prior to that time,  Mr.  Blondin
served at Proteon,  Inc. as Controller  from February 1987 to February  1993, as
General Manager of European Subsidiaries from September 1992 until February 1993
and as Vice President from January 1990 to February 1993.

Michael  A.  Champa  has  served as Vice  President  of  Worldwide  Sales of the
Corporation since May 1995, and has served as Vice President of Customer Service
since  January  1997.  From April 1993 to May 1995,  Mr.  Champa  served as Vice
President of Sales of the Corporation.  Prior to that time, Mr. Champa served as
Vice  President  of  International  Sales at Microcom  Inc., a  manufacturer  of
modems,  communications software and internetworking  equipment, from March 1991
to April 1993 and at Racal-Interlan, Inc., a manufacturer of data communications
and internetworking  products, as National Sales Director, from February 1990 to
February  1991 and as  Director of  International  Sales from  February  1987 to
February 1990.

James A. Dolce,  Jr. has served as Vice President and General  Manager of Remote
Access of the  Corporation  since February 1997. From May 1996 to February 1997,
Mr.  Dolce  served  as  Vice  President  of  Remote  Access   Marketing  of  the
Corporation.  Prior to that time,  Mr. Dolce was a founder and Vice President of
Sales and Marketing of Arris Networks, Inc., a developer of carrier-class remote
access  products,  from its inception to May 1996. From April 1989 to June 1995,
Mr.  Dolce was also a founder  and Vice  President  of Sales  and  Marketing  of
Promptus  Communications,  a manufacturer  of high speed digital  network access
products.

John E. Dowling has served as Vice  President of Operations  of the  Corporation
since May 1994.  Prior to that time,  Mr.  Dowling  served as Vice  President of
Operations at Coral Network  Corporation  from July 1991 to May 1994 and as Vice
President of Operations at Epoch Systems,  Inc., formerly a manufacturer of mass
storage devices, from March 1987 to July 1991.

Robert N. Machlin has served as Vice  President of Marketing of the  Corporation
since October 1994.  Prior to that time,  Mr.  Machlin  served as an independent
consultant  to  manufacturers  of  networking  equipment  from  December 1993 to
September  1994.  Mr.  Machlin  served as Vice  President  of Marketing at Coral
Network  Corporation from October 1992 to November 1993 and as Vice President of
Marketing at Amnet,  Inc., a manufacturer  of wide area network  switches,  from
November 1988 to October 1992.

Jonathan M. Reeves has served as Vice President and General Manager of Broadband
Access of the  Corporation  since January 1997.  Prior to that time,  Mr. Reeves
served as Chief  Executive  Officer of Sahara  Networks,  Inc.,  a developer  of
scaleable,  high-speed broadband access products from June 1995 to January 1997.
Mr. Reeves served at General  DataComm,  Inc., a supplier of networking  and ATM
switching equipment,  as Associate Vice President for the ATM Business Unit from
January 1995 to May 1995, as Executive Director ATM from January 1994 to January
1995, as Director  System  Architecture  from August 1991 to January 1994 and as
Product Manager from October 1989 to August 1991.



                       COMPENSATION AND OTHER INFORMATION
                        CONCERNING DIRECTORS AND OFFICERS

Executive Compensation Summary

         The  following  table sets forth  summary  information  concerning  the
annual and long-term  compensation  paid or earned for services  rendered to the
Corporation  during the fiscal years ended  December 31, 1996,  1995 and 1994 to
the  Corporation's  Chief  Executive  Officer  and each of the four most  highly
compensated  executive  officers  of the  Corporation  in fiscal  year 1996 (the
"Named Executive Officers").

<TABLE>

                           Summary Compensation Table

                   Annual Compensation (1)             Long Term
                   ------------------------            Compensation (3)
                    Fiscal Year
                      Ending                           Awards       All Other
Name and Principal  December 31, Salary  Bonus($)(2)  Options(#)   Compensation
Position
<S>                   <C>      <C>       <C>           <C>          <C>
Daniel E. Smith        1996    $214,615  $140,148         -                -
President and Chief    1995     193,596    82,258      330,778             -
Executive Officer      1994     122,038    60,000         -                -

Gururaj Deshpande      1996     189,231   103,588         -                -
Executive Vice         1995     149,269    63,275      180,874             -
President of           1994     111,885    15,000         -                -
Business Development

Paul E. Blondin        1996     149,423    79,214         -                -
Vice President of      1995     119,846    44,293      108,526             -
Finance and            1994     111,885    18,500         -                -
Administration and
Chief Financial Officer

Michael A. Champa      1996     149,327   213,896(4)      -                -
Vice President of      1995     114,505   164,476(4)   180,874             -
Worldwide Sales and    1994     100,000   295,905(4)      -                -
Customer Service

Robert N. Machlin      1996     144,519    79,214         -                -
   Vice President of   1995     120,000    37,965      156,756             -
   Marketing           1994      27,692      -         300,002             -

- -------------------
</TABLE>

(1)      Excludes perquisites and other personal benefits, if any, the aggregate
         annual  amount of which for each  officer  was less than the  lesser of
         $50,000 or 10% of the total of annual salary and bonus reported.

(2)      Bonuses are reported in the year earned, even if actually paid in a 
         subsequent year.

(3)      The  Corporation  did not grant any  restricted  stock  awards or stock
         appreciation rights or make any long term incentive plan payouts during
         the fiscal years ended December 31, 1996, 1995 and 1994.

(4)      Consists of amounts paid pursuant to commissions.


Option Grants in the Last Fiscal Year

         The Corporation  did not grant any stock options or stock  appreciation
rights to the Named Executive Officers during the fiscal year ended December 31,
1996.

Option Exercises and Fiscal Year-End Values

         The following table sets forth  information  with respect to options to
purchase the  Corporation's  Common  Stock  granted to the  Corporation's  Named
Executive  Officers  under the Amended and Restated 1991 Stock Plan,  including:
(i) the number of shares of Common Stock  purchased  upon exercise of options in
the fiscal year ending  December 31, 1996; (ii) the net value realized upon such
exercise;  (iii) the number of unexercised  options  outstanding at December 31,
1996; and (iv) the value of such unexercised options at December 31, 1996.


<TABLE>
                   Aggregated Option Exercises In Last Fiscal
                    Year and December 31, 1996 Option Values
                                                            
                                   
                                   

                                                         
                                                         
                                        Number of         
                   Shares               Unexercised       Value of Unexercised
                   Acquired             Options at        In-the-Money Options
                   on        Value      December 31,      at December 31,
                   Exercise  Realized   1996 (#)          1996 ($)(2)
Name               (#)       ($)(1)     Exercisable/      Exercisable/
                                        Unexercisable     Unexercisable
- --------------     -------- ---------- ----------------  ----------------------
<S>                <C>      <C>        <C>               <C>
Daniel E. Smith    702,428 $35,197,578 1,368,597/555,959 $73,732,692/$23,873,480
Gururaj Deshpande        0           0   36,174/144,700      1,068,640/4,274,680
Paul E. Blondin    126,000   7,038,300   21,704/248,822      641,172/11,489,717
Michael A. Champa        0           0   144,174/306,700    7,018,541/13,199,530
Robert N. Machlin   60,000   3,535,487   31,352/305,406      926,190/12,232,238
- -----------------------
</TABLE>

(1)     Amounts  disclosed  in  this  column  do not  reflect  amounts  actually
        received by the Named Executive  Officers,  but are calculated  based on
        the difference between the fair market value of the Corporation's Common
        Stock on the date of exercise  and the  exercise  price of the  options.
        Named  Executive  Officers  will receive cash only if and when they sell
        the Common Stock  issued upon  exercise of the options and the amount of
        cash  received  by such  individuals  is  dependent  on the price of the
        Corporation's Common Stock at the time of such sale.

(2)     Value is based on the difference  between the option  exercise price and
        the fair market value at December 31, 1996,  the last day during  fiscal
        year 1996 for which market  prices are  available  ($55.125 per share as
        quoted on the  Nasdaq  National  Market),  multiplied  by the  number of
        shares underlying the option.


Compensation Committee Report on Executive Compensation

         The Compensation  Committee of the Board of Directors (the "Committee")
is responsible for establishing and administering  the  Corporation's  executive
compensation  policies and plans.  The Committee is composed of two  independent
outside  directors.  This report is submitted by the Committee and addresses the
Corporation's policies for the fiscal year ended December 31, 1996 as they apply
to all executive officers.

General Compensation Policy

         The  Committee's  compensation  program  is  designed  to  achieve  the
following objectives:

                  - To enhance profitability of the Corporation and stockholder
                     value.

                  -  To  reward  executives  consistent  with the  Corporation's
                     annual and long-term performance goals.

                  - To recognize individual initiative and achievement.

                  - To provide  competitive  compensation  that will attract and
retain qualified executives.

Procedure for Establishing Compensation

         At the  beginning of each fiscal year,  the  Committee  establishes  an
annual salary plan for the  Corporation's  senior  executive  officers  based on
recommendations  from the  Corporation's  Chief Executive  Officer and the Human
Resources Department.  The Committee reviews these  recommendations  taking into
account the following factors:  (i) external market data, (ii) the Corporation's
performance,  (iii) the individual's  contribution to the Corporation's success,
and (iv) the internal equity of pay relationships.

         In  fiscal  year  1996,   the   Corporation   retained  an  independent
compensation consultant at the request of the Committee. The consultant compared
the  Corporation's  executive  compensation  policies with those of companies of
comparable size in the industry.

Executive Officer Compensation Program

         The Corporation's  executive officer  compensation  program consists of
three elements:
(i) base salary which is based upon the overall  performance of the  Corporation
and external  market data,  (ii) annual  incentive  compensation  in the form of
bonuses  and  commissions  which is based  upon  achievement  of  pre-determined
financial objectives of the Corporation and individual non-financial objectives,
and  (iii)  long-term  incentive  compensation,  in the form of  stock  options,
granted with the objective of aligning executive  officers'  long-term interests
with those of the  stockholders  and  encouraging  the  achievement  of superior
results over an extended period.

         Base Salary.  Base salary is generally set within the range of salaries
of  executive   officers  with   comparable   qualifications,   experience   and
responsibilities  at other  companies of comparable size and success in the same
or similar businesses.  The Committee employs an outside compensation consultant
to gather such external market data. The Committee has generally set base salary
in the low- to  mid-range  level of  competitive  compensation.  In  addition to
external  market  data,  salary  is also  based on the  Corporation's  financial
performance as well as individual performance.

         Annual Incentive Compensation.  Annual incentive  compensation,  in the
form of bonuses and commissions,  is based on the  Corporation's  achievement of
pre-determined  revenue  and  earnings  objectives  and is also based on various
non-financial  objectives  such as the  ability to motivate  and manage  others,
develop and maintain  the skills  necessary  to work in a  high-growth  company,
recognize and pursue new business opportunities and initiate programs to enhance
the Corporation's growth and success.

         Long-Term Incentive Compensation.  Long-term incentive compensation, in
the  form of  stock  options,  allows  the  executive  officers  to share in any
appreciation  in the value of the  Corporation's  Common  Stock.  The  Committee
believes  that  stock  option   participation  aligns  the  executive  officers'
interests with those of the stockholders.  When establishing  stock option grant
levels for executive officers,  the Committee  considered the existing levels of
stock  ownership,  previous  grants  of  stock  options,  vesting  schedules  of
previously  granted  options and the current stock price.  Stock options granted
under the  Corporation's  Amended and Restated  1991 Stock Plan have an exercise
price equal to the fair market  value of the stock on the date of grant and vest
over a five-year period.

         No stock options were granted to either the Chief Executive  Officer or
any of the Named  Executive  Officers  during the fiscal year ended December 31,
1996 as the Committee determined that the stock and option holdings of the Named
Executive   Officers   adequately  align  their  interests  with  those  of  the
stockholders of the Corporation. During the fiscal year ended December 31, 1996,
options to purchase an aggregate of 150,000 shares of the  Corporation's  Common
Stock  were  granted  to  James A.  Dolce,  Jr.,  an  executive  officer  of the
Corporation.

Tax Considerations

         The Corporation does not believe Section 162(m) of the Internal Revenue
Code of 1986,  as amended (the  "Code"),  which  disallows a tax  deduction  for
certain  compensation in excess of $1 million,  will generally have an effect on
the Corporation.  The Committee has structured  Executive  Officer  Compensation
such that it meets the exception for qualified performance-based compensation in
accordance  with  Internal  Revenue  Code  Regulations  and  therefore  is fully
deductible.

Summary of Compensation of the Chief Executive Officer

         In fiscal year 1996, the  Corporation's  President and Chief  Executive
Officer,  Daniel E. Smith, received a salary and bonus compensation of $354,763,
including base salary of $214,615 and bonus compensation of $140,148.

         Consistent with the Committee's philosophy, Mr. Smith's base salary for
1996 was in the low- to mid- range level of competitive compensation.  The bonus
paid to Mr. Smith for fiscal 1996  reflected the  Corporation's  achievement  of
certain  financial  objectives,  the successful  acquisition of Arris  Networks,
Inc.,  the  work  in  connection  with  the  proposed  Sahara   Networks,   Inc.
acquisition,  the expansion of the Corporation's  senior management team and the
Corporation's  continued  development of innovative products.  Mr. Smith was not
granted any stock  options in 1996 after  consideration  of his  existing  stock
options,  stock option  exercises,  existing  vesting  schedules and the current
exercise price of existing stock options in relation to the current stock price.




                          Respectfully submitted by the Compensation Committee:

                           Victoria A. Brown
                           Paul J. Ferri


Compensation Committee Interlocks and Insider Participation

         During the fiscal year ended December 31, 1996, Ms. Brown and Mr. Ferri
served on the Compensation  Committee.  No member of the Compensation  Committee
was at any time  during the past fiscal year or at any other time (i) an officer
or employee of the Corporation or any of its subsidiaries,  or (ii) was formerly
an officer of the Corporation or any of its subsidiaries.

         In May  1996,  the  Corporation  completed  its  acquisition  of  Arris
Networks, Inc. ("Arris"), a privately-held  developer of high performance remote
access  technology  for  carrier  class  networks,  by means  of a  merger  (the
"Merger") of a wholly-owned  subsidiary of the Corporation  with and into Arris.
As a result  of the  Merger,  Arris  became  a  wholly-owned  subsidiary  of the
Corporation.  The  Corporation  issued  approximately  3.2 million shares of the
Corporation's  Common Stock in exchange for all outstanding  shares of Arris, of
which  60,886  shares  were  issued  to  Matrix IV  Entrepreneurs  Fund,  LP and
1,156,852 shares were issued to Matrix Partner IV, LP. Paul J. Ferri, a director
of the Corporation, is a general partner of the general partner of each of these
entities.  The Company also assumed all  outstanding  Arris  options to purchase
approximately 242,000 shares of the Corporation's Common Stock.

         No  executive  officer  of the  Corporation  served  as a member of the
Compensation Committee (or other Board committee performing equivalent functions
or, in the absence of any such  committee,  the entire  Board of  Directors)  of
another  entity,  where an executive  officer of such other  entity  served as a
director  of  the  Corporation.   In  addition,  no  executive  officer  of  the
Corporation  served on the Board of  Directors of another  entity,  one of whose
executive  officers  served as a member  of the  Compensation  Committee  of the
Corporation.


Compensation of Directors

         As compensation for serving on the Board of Directors,  the Corporation
pays each non-employee  director $5,000 annually and an additional $500 for each
meeting that they attend of the Board of Directors and Board committees on which
they serve.  Non-employee  directors  may  receive  expense  reimbursements  for
attending Board and committee meetings.  Directors who are officers or employees
of the Corporation do not receive any additional compensation for their services
as directors.  Non-employee  directors are also entitled to  participate  in the
Corporation's  1994 Non-Employee  Director Stock Option Plan (the  "Director 
Plan"). Under  the  Director  Plan,  each  non-employee  director  as of 
July  28,  1994 automatically received an option for 90,000 shares of Common 
Stock on such date, and each  non-employee  director  first elected to the 
Board of Directors  after July 28, 1994 automatically  receives an option for
90,000 shares on the date of his or her election (each, an "Initial Grant").  
Every non-employee director who continues  to be a  non-employee  director 
immediately  following  each  annual meeting of stockholders  occurring after 
his or her Initial Grant automatically receives an option to purchase 12,000 
shares of Common Stock on each such annual meeting date (each, a "Subsequent 
Grant").  Initial Grants become exercisable in three equal annual  installments
from the date of grant and  Subsequent  Grants become exercisable on the earlier
of one year from the date of grant or the date of the next annual meeting of 
stockholders.  The exercise price per share of all options granted under the 
Director Plan is equal to the fair market value of the Corporation's  Common 
Stock on the date of grant, and such options expire on the date which is ten 
years from the date of the option  grant.  Options to purchase 90,000  shares of
Common  Stock at an  exercise  price of $43.625  per share and 60,000 shares of
Common Stock at an  exercise  price of $51.375 per share were granted in 1996.

         If the  proposed  amendment  to the  Director  Plan is  approved by the
stockholders  of the Corporation at the Annual Meeting then the Initial Grant to
non-employee  directors elected for the first time after the Annual Meeting will
be amended from 90,000 shares to 30,000 shares and each Subsequent  Grant to all
non-employee  directors  occurring after the Annual Meeting will be amended from
12,000 shares to 10,000 shares.



Stock Performance Graph

         The  following  graph  compares  the  yearly  percentage  change in the
cumulative total stockholder return on the Corporation's Common Stock during the
period from the Corporation's initial public offering through December 31, 1996,
with the cumulative  total return on the Nasdaq  Telecommunications  Stock Index
and  Standard  and Poor's  400 Stock  Index.  The  comparison  assumes  $100 was
invested on July 28, 1994 in the  Corporation's  Common Stock and in each of the
foregoing indices and assumes reinvestment of dividends, if any.

             Comparison of Five Year* Cumulative Total Return Among
           Cascade Communications Corp., the Nasdaq Telecommunications
               Stock Index and Standard and Poor's 400 Stock Index


                   CSCC:     Cascade Communications Corp.
                   S&P 400:  Standard and Poor's 400 Stock Index
                   Nasdaq Telecom Index:  Nasdaq Telecommunications Stock Index
<TABLE>
<S>                    <C>      <C>      <C>       <C>      <C>      <C>
                       7/28/94  9/30/94  12/30/94  3/31/95  6/30/95  9/29/95
CSCC                     100      315      412      460       577      657
S&P 400                  100      104      103      113       123      130
Nasdaq Telecom Index     100      105       98      102       112      131

                       12/29/95  3/29/96  6/28/96  9/30/96  12/31/96
CSCC                     1,137    1,795    2,720     3,260    2,205 
S&P 400                    136      144      150       153      164
Nasdaq Telecom Index       131      138      141       136      136

</TABLE>

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

* Prior to July 28, 1994 the Corporation's Common Stock was not publicly traded.
Comparative data is provided only for the period since that date.


Certain Relationships and Related Transactions

         In May  1996,  the  Corporation  completed  its  acquisition  of  Arris
Networks, Inc. ("Arris"), a privately-held  developer of high performance remote
access  technology  for  carrier  class  networks,  by means  of a  merger  (the
"Merger") of a wholly-owned  subsidiary of the Corporation  with and into Arris.
As a result  of the  Merger,  Arris  became  a  wholly-owned  subsidiary  of the
Corporation.  The  Corporation  issued  approximately  3.2 million shares of the
Corporation's  Common Stock in exchange for all outstanding  shares of Arris, of
which  60,886  shares  were  issued  to  Matrix IV  Entrepreneurs  Fund,  LP and
1,156,852 shares were issued to Matrix Partner IV, LP. Paul J. Ferri, a director
of the Corporation, is a general partner of the general partner of each of these
entities.  The Company also assumed all  outstanding  Arris  options to purchase
approximately 242,000 shares of the Corporation's Common Stock.

         The Corporation has adopted a policy that all transactions  between the
Corporation  and its  officers,  directors,  principal  stockholders  and  their
affiliates  be on terms  no less  favorable  to the  Corporation  than  could be
obtained from unrelated  third parties and must be approved by a majority of the
outside  independent  and  disinterested  directors.  No such  transactions  are
currently being considered.


            PROPOSAL TO AMEND THE 1994 NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN

         The 1994 Non-Employee Director Stock Option Plan (the "Director Plan"),
which was adopted by the Board of  Directors  on April 29, 1994 and  approved by
the  Corporation's  stockholders  on May 23,  1994,  provides  for the  grant of
options  to  purchase  shares  of  the   Corporation's   Common  Stock  only  to
non-employee  directors  of the  Corporation.  Under  the  Director  Plan,  each
non-employee  director as of July 28, 1994 automatically  received an option for
90,000 shares of Common Stock on such date, and each non-employee director first
elected to the Board of Directors after July 28, 1994 automatically  receives an
option for 90,000 shares on the date of his or her election  (each,  an "Initial
Grant"). Every non-employee director who continues to be a non-employee director
immediately following each annual meeting of stockholders occurring after his or
her Initial Grant automatically  receives an option to purchase 12,000 shares of
Common Stock on each such annual meeting date (each, a "Subsequent  Grant"). The
Corporation currently has five non-employee directors eligible to participate in
the Director Plan.

         It is now proposed to approve  amendments  to the Director  Plan to (i)
amend the initial stock option grant from 90,000 shares to 30,000  shares;  (ii)
to amend the stock option grant for each subsequent year of service on the Board
of Directors from 12,000 to 10,000  shares;  (iii) to limit the number of shares
granted for each initial  stock option grant and the stock option grant for each
subsequent year of service on the Board of Directors to the amount stated above;
and (iv)  increase the number of shares of Common Stock  available  for issuance
under the Director  Plan from 720,000  shares to 870,000  shares.  The executive
officers of the  Corporation  believe  that the  Director  Plan is  important to
permit the Corporation to obtain and retain the service of qualified persons who
are neither employees nor officers of the Corporation to serve as members of the
Board of Directors.

         If the proposed amendments to the Director Plan are not approved by the
stockholders  of the  Corporation,  the current  provisions of the Director Plan
regarding the number of options granted to non-employee directors and the number
of shares of Common  Stock  issuable  under  the  Director  Plan will  remain in
effect.

Description of the Director Plan

         Administration.  The Director Plan is administered by the  Compensation
Committee of the Corporation's Board of Directors.  The Compensation  Committee,
subject to the  provisions of the Director  Plan,  has the power to construe the
Plan, to determine all  questions  thereunder  and to adopt and amend such rules
and  regulations  for the  administration  of the  Director  Plan as it may deem
desirable.

         Automatic  Grant  of  Options.  Options  are  granted  pursuant  to the
Director Plan only to members of the Board of Directors of the  Corporation  who
are neither  employees nor officers of the Corporation.  Under the provisions of
the Director Plan, each non-employee  director as of July 28, 1994 automatically
received  an  option  for  90,000  shares  of Common  Stock on such  date.  Each
non-employee  director  first  elected to the Board of Directors  after July 28,
1994 will  automatically  receive an option for 90,000 shares on the date of his
or her election. Each non-employee director granted an initial grant pursuant to
the  Director  Plan who  continues  to be a  non-employee  director  immediately
following each  successive  annual meeting of  stockholders  occurring after the
initial grant shall automatically receive an option to purchase 12,000 shares of
Common Stock on each such annual meeting date.

         Shares Subject to the Director  Plan. The Director Plan  authorizes the
grant of options to purchase 720,000 shares of Common Stock of the Corporation.

         Option Price. The exercise price per share of options granted under the
Director Plan is 100% of the fair market value of the Corporation's Common Stock
on the date the option is granted.

         Period of Option.  Options granted under the Director Plan shall expire
on the date which is ten (10) years after the date of grant of the option.

         Vesting of Shares and  Non-Transferability of Options.  Options granted
under the  Director  Plan shall not be  exercisable  until they  become  vested.
Initial Grants become exercisable in three equal annual  installments  beginning
one year from the date of grant and Subsequent Grants become  exercisable on the
earlier  of one year  from  the  date of  grant  or the date of the next  annual
meeting of stockholders, provided that the optionee has continuously served as a
member of the Board of Directors through  such  vesting date and has attended at
least 75% of the Board of Directors meetings held during such period.

         Any  option  granted  pursuant  to  the  Director  Plan  shall  not  be
assignable  or  transferable  other  than  by will or the  laws of  descent  and
distribution or pursuant to a domestic  relations order and shall be exercisable
during the optionee's lifetime only by him or her.

         Effect of Termination  as a Director or of Death or Disability.  In the
event an optionee ceases to be a member of the Board of Directors for any reason
other  than  death or  permanent  disability,  any then  unexercised  portion of
options  granted  to  such  optionee  shall,  to the  extent  not  then  vested,
immediately  terminate  and become void;  any portion of an option which is then
vested but has not been  exercised  at the time the  optionee  so ceases to be a
member of the Board of  Directors  may be  exercised,  to the  extent it is then
vested,  by the optionee  within 90 days of the date the optionee ceased to be a
member of the Board of Directors;  and all options shall terminate after such 90
days have expired.

         In the  event  an  optionee  ceases  to be a  member  of the  Board  of
Directors  by reason of his or her death of  permanent  disability,  any  option
granted to such optionee shall be immediately and automatically  accelerated and
become fully vested and all  unexercised  options  shall be  exercisable  by the
optionee (or by the optionee's personal representative,  heir or legatee, in the
event of death) until the scheduled expiration date of the option.

         Exercise of Options.  An option granted under the Director Plan, to the
extent then exercisable,  may be exercised in whole or in part by giving written
notice to the Corporation stating the number of shares with respect to which the
option is being  exercised,  which  generally shall not be less than 100 shares,
accompanied  by payment in full for such  shares.  Payment  may be (a) in United
States  dollars  in cash or by  check,  (b) in whole or in part in shares of the
Common  Stock  of the  Corporation  already  owned  by  the  person  or  persons
exercising the option or shares subject to the option being  exercised  (subject
to such  restrictions  and  guidelines  as the Board of Directors may adopt from
time to time),  valued at fair market value or (c)  consistent  with  applicable
law,  through the delivery of an assignment to the  Corporation  of a sufficient
amount of the proceeds from the sale of the Common Stock  acquired upon exercise
of the option and an  authorization  to the broker or selling  agent to pay that
amount to the Corporation.

         Adjustments Upon Changes in Capitalization  and Other Events.  Upon the
occurrence of any of the following  events, an optionee's rights with respect to
options  granted  to him or her  under  the  Director  Plan  shall  be  adjusted
hereinafter provided:

         (a)  Stock  Dividend  and Stock  Splits.  If the shares of Common Stock
              shall be subdivided  or combined into a greater or smaller  number
              of shares or if the  Corporation  shall issue any shares of Common
              Stock as a stock  dividend on its  outstanding  Common Stock,  the
              number of shares of Common Stock  deliverable upon the exercise of
              options   shall   be   appropriately    increased   or   decreased
              proportionately,  and appropriate adjustments shall be made in the
              purchase price per share to reflect such subdivision,  combination
              or stock dividend.

         (b)   Recapitalization Adjustments.  If the Corporation is to be 
               consolidated with or acquired by another entity in a merger, 
               sale of all or substantially all of the Corporation's assets or
               otherwise, each option granted under the Director Plan which is 
               outstanding but unvested as of the effective date of such event 
               shall become exercisable in full thirty (30) days prior to the 
               effective date of such event.  In the event of a reorganization,
               recapitalization, merger, consolidation, or any other change in
               the corporate structure or shares of the Corporation, to the 
               extent permitted by Rule 16b-3 under the Securities Exchange Act 
               of 1934, adjustments in the number and kind of shares authorized
               by the Director Plan and in the number and kind of shares covered
               by, and in the option price of outstanding options under the 
               Director Plan necessary to maintain the proportionate interest of
               the optionee and preserve, without exceeding, the value of such
               options, shall be made.  Notwithstanding the foregoing, no such
               adjustment shall be made which would, within the meaning of any
               applicable previsions of the Internal Revenue Code of 1986, as
               amended, constitute a modification, extension or renewal of any
               option or a grant of additional benefits to the holder of an 
               option.

         (c)  Issuances of Securities.  Except as expressly  provided herein, no
              issuance by the  Corporation  of shares of stock of any class,  or
              securities  convertible  into shares of stock of any class,  shall
              affect,  and no  adjustment  by reason  thereof shall be made with
              respect to, the number or price of shares  subject to options.  No
              adjustments  shall  be  made  for  dividends  paid  in  cash or in
              property other than securities of the Corporation.

         Termination  and  Amendment  of Plan.  Options may no longer be granted
under the  Director  Plan after  April 28,  2004,  and the  Director  Plan shall
terminate  when all  options  granted or to be granted  hereunder  are no longer
outstanding.  The Board of Directors may at any time terminate the Director Plan
or make such modification or amendment thereof as it deems advisable;  provided,
however,  that  the  Board  of  Directors  may  not,  without  approval  by  the
affirmative  vote of the  holders  of a majority  of the shares of Common  Stock
present in person or by proxy and  entitled to vote at a meeting,  (a)  increase
the maximum number of shares for which options may be granted under the Director
Plan, (b) materially modify the requirements as to eligibility to participate in
the Director Plan, (c) materially  increase  benefits accruing to option holders
under the  Director  Plan,  (d)  change  the  provisions  of the  Director  Plan
regarding  the  termination  of  the  options  or the  times  when  they  may be
exercised,  (e)  change the  designation  of the class of  persons  eligible  to
receive options,  or (f) amend the Director Plan in any manner which would cause
Rule  16b-3  under the  Securities  Exchange  Act (or any  successor  or amended
provision  thereof) to become  inapplicable  to the Director  Plan; and provided
further  that  the   provisions   of  the  Director   Plan   specified  in  Rule
16b-3(c)(2)(ii)(A)  (or any successor or amended  provision  thereof)  under the
Securities Exchange Act of 1934 (including without limitation,  provisions as to
eligibility,  amount,  price and timing of awards) may not be amended  more than
once  every six  months,  other  than to comport  with  changes in the  Internal
Revenue  Code,  the  Employee  Retirement  Income  Security  Act,  or the  rules
thereunder.  Termination or any  modification  or amendment of the Director Plan
shall not,  without consent of a participant,  affect his or her rights under an
option previously granted to him or her.

         Federal  Income Tax  Consequences.  Options  granted under the Director
Plan are intended to be Nonqualified  Options for federal income tax purposes. A
director will not recognize any taxable income upon the grant of an option under
the Director Plan, but will generally recognize ordinary  compensation income at
the time of exercise of the option in an amount equal to the excess,  if any, of
the fair market  value of the shares on the date of exercise  over the  exercise
price. Upon the exercise of an option, the Corporation, may require the optionee
to pay  withholding  taxes in respect of amounts  considered to be  compensation
includible in the optionee's gross income.  In some  circumstances,  however,  a
director may acquire  Common Stock  subject to special rules under Section 83 of
the Code because of certain securities laws restrictions on resale.

         Generally,  upon any grant or exercise of an option in which a director
does not recognize  compensation income, no tax deduction will be allowed to the
Corporation.  When a director recognizes  compensation income as a result of the
exercise of an option under the Director Plan, the Corporation generally will be
entitled to a corresponding deduction for income tax purposes.

                               Option Information

         The following table sets forth as of March 1, 1997,  options granted in
the aggregate under the Director Plan to each non-employee director:
<TABLE>

Name                          Title                      No. of Options Granted
<S>                          <C>                          <C>
Victoria A. Brown.......     Director                     114,000
Richard M. Burnes, Jr...     Director                     114,000
Paul J. Ferri...........     Director                     114,000
Bruns H. Grayson........     Director                     114,000
Steven C. Walske........     Director                     102,000

</TABLE>

         Approval  of the  amendments  to the  Director  Plan will  require  the
affirmative vote of a majority of the outstanding  shares of Common Stock of the
Corporation eligible to vote and present and voting on this matter.

         The  Board  of  Directors  recommends  a vote FOR the  approval  of the
amendments to the Director Plan.


       PROPOSAL TO AMEND THE AMENDED AND RESTATED CERTIFICATE OF INCORPORATION

         By a Board of  Directors  vote dated  January  22,  1997,  the Board of
Directors  recommended  to the  stockholders  that  the  Corporation  amend  the
Corporation's  Amended and Restated Certificate of Incorporation (the "Charter")
to increase the number of authorized shares of Common Stock, par value $.001 per
share,  from  225,000,000 to  300,000,000  shares.  Shares of the  Corporation's
Common Stock, including the additional shares proposed for authorization, do not
have preemptive or similar rights.

         As of February 20, 1997, there were approximately  91,528,185 shares of
Common Stock issued and outstanding and, assuming the proposal to amend the 1994
Non-Employee Director Plan is approved,  there will be approximately  19,809,856
shares reserved for future issuance pursuant to the  Corporation's  stock plans.
If the  amendment to the Charter is approved,  the Board of Directors  will have
the authority to issue  approximately  188,661,959  additional  shares of Common
Stock without further stockholder approval. The Board of Directors believes that
the  authorized  number of shares of Common Stock should be increased to provide
sufficient shares for such corporate  purposes as may be determined by the Board
of Directors to be necessary or desirable.  These purposes may include,  without
limitation:   acquiring   other   businesses  in  exchange  for  shares  of  the
Corporation's Common Stock; entering into collaborative research and development
arrangements  with other companies in which Common Stock or the right to acquire
Common Stock are part of the  consideration;  facilitating  broader ownership of
the  Corporation's  Common  Stock by  effecting a stock split or issuing a stock
dividend;  raising capital through the sale of Common Stock;  and attracting and
retaining valuable  employees by the issuance of stock options.  The Corporation
at present has no  commitments,  agreements  or  undertakings  to issue any such
additional  shares.  The  Board of  Directors  considers  the  authorization  of
additional  shares of Common Stock  advisable to ensure prompt  availability  of
shares for issuance should the occasion arise.

         The issuance of additional shares of Common Stock could have the effect
of diluting  earnings per share and book value per share,  which could adversely
affect the Corporation's existing  stockholders.  In addition, the Corporation's
authorized but unissued shares of Common Stock could be used to make a change in
control of the Corporation more difficult or costly.  Issuing  additional shares
of Common Stock could have the effect of diluting stock ownership of the persons
seeking to obtain  control of the  Corporation.  The  Corporation  is not aware,
however,  of  any  pending  or  threatened  efforts  to  obtain  control  of the
Corporation,  and the Board of  Directors  has no current  intention  to use the
additional shares of Common Stock in order to impede a takeover attempt.

         Approval  of  the  proposed  amendment  to  the  Amended  and  Restated
Certificate  of   Incorporation   will  require  the  affirmative  vote  of  the
stockholders of at least a majority of all outstanding shares of Common Stock of
the Corporation.

         The  Board  of  Directors  recommends  a vote FOR the  approval  of the
amendment   to  the   Corporation's   Amended  and   Restated   Certificate   of
Incorporation.


                      RATIFICATION OF SELECTION OF AUDITORS

         The Corporation's consolidated financial statements for the years ended
December  31,  1994,  1995 and 1996 were  audited  by  Coopers & Lybrand  L.L.P.
("Coopers & Lybrand"). The Board of Directors has selected the firm of Coopers &
Lybrand,  independent certified public accountants, to serve as auditors for the
fiscal  year  ending  December  31,  1997.  Coopers & Lybrand  has served as the
Corporation's auditors since 1993. It is expected that a member of the firm will
be present at the meeting with the opportunity to make a statement if so desired
and will be available to respond to appropriate questions.

         The Board of Directors  recommends a vote FOR the  ratification of this
selection.


             SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

         Section  16(a) of the  Exchange Act of 1934,  as amended,  requires the
Corporation's directors,  executive officers and holders of more than 10% of the
Corporation's  outstanding  shares of  Common  Stock  (collectively,  "Reporting
Persons") to file with the Securities and Exchange Commission (the "Commission")
initial reports of ownership and reports of changes in ownership of Common Stock
of the  Corporation.  Such persons are required by regulations of the Commission
to furnish the Corporation with copies of all such filings.  Based on its review
of the copies of such  filings  received  by it with  respect to the fiscal year
ended  December  31, 1996 and written  representations  from  certain  Reporting
Persons,  the Corporation  believes that all Reporting Persons complied with all
Section 16(a) filing  requirements  in the fiscal year ended  December 31, 1996,
with the  following  exceptions:  Daniel E. Smith,  President,  Chief  Executive
Officer and  Director  of the  Corporation,  filed an Amended  Form 4 in January
1997,  reporting a transaction  which should have been reported in May 1996; and
Gururaj Deshpande, Executive Vice President of Business Development and Chairman
of the Board of Directors,  filed an Amended Form 4 in January 1997, reporting a
transaction which should have been reported in May 1996.


                              STOCKHOLDER PROPOSALS

         Proposals of stockholders intended for inclusion in the proxy statement
to be furnished to all stockholders  entitled to vote at the next Annual Meeting
of  Stockholders  of the  Corporation  must  be  received  at the  Corporation's
principal executive offices not later than December 5, 1997. In order to curtail
any  controversy  as to the  date  on  which  a  proposal  was  received  by the
Corporation, it is suggested that proponents submit their proposals by Certified
Mail, Return Receipt Requested.


                            EXPENSES AND SOLICITATION

         The cost of solicitation  of proxies will be borne by the  Corporation,
and,  in  addition  to  soliciting  stockholders  by mail  through  its  regular
employees,  the  Corporation  may request banks,  brokers and other  custodians,
nominees  and  fiduciaries  to  solicit  their  customers  who have stock of the
Corporation registered in the names of a nominee and, if so, will reimburse such
banks,  brokers  and  other  custodians,  nominees  and  fiduciaries  for  their
reasonable  out-of-pocket  costs.  Solicitation by officers and employees of the
Corporation  may  also be  made  of some  stockholders  in  person  or by  mail,
telephone or telegraph following the original solicitation.  The Corporation has
retained Corporate Investors Communications,  Inc. to assist in the solicitation
of  proxies  and  will pay  this  company  a fee of  approximately  $5,500  plus
out-of-pocket expenses.








                         CASCADE COMMUNICATIONS CORP.

                 1994 NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN


      1. Purpose.  This Non-Qualified Stock Option Plan, to be known as the 1994
Non-Employee  Director Stock Option Plan (hereinafter,  this "Plan") is intended
to promote the  interests  of Cascade  Communications  Corp.  (hereinafter,  the
"Company")  by  providing  an  inducement  to obtain and retain the  services of
qualified  persons who are not  employees or officers of the Company to serve as
members of its Board of Directors (the "Board").

      2. Available Shares. The total number of shares of Common Stock, par value
$.001 per share,  of the Company (the "Common  Stock") for which  options may be
granted under this Plan shall not exceed 720,000  shares,  subject to adjustment
in accordance  with  paragraph 11 of this Plan.  Shares subject to this Plan are
authorized but unissued shares or shares that were once issued and  subsequently
reacquired  by  the  Company.  If  any  options  granted  under  this  Plan  are
surrendered before exercise or lapse without exercise,  in whole or in part, the
shares reserved therefor shall continue to be available under this Plan.

      3.  Administration.  This Plan shall be  administered by the Board or by a
committee appointed by the Board (the "Committee"). In the event the Board fails
to appoint or refrains  from  appointing a  Committee,  the Board shall have all
power and authority to administer this Plan. In such event, the word "Committee"
wherever  used herein shall be deemed to mean the Board.  The  Committee  shall,
subject to the provisions of the Plan,  have the power to construe this Plan, to
determine  all  questions  hereunder,  and to adopt  and  amend  such  rules and
regulations for the  administration  of this Plan as it may deem  desirable.  No
member  of the  Board  or the  Committee  shall  be  liable  for any  action  or
determination made in good faith with respect to this Plan or any option granted
under it.

      4.      Automatic Grant of Options.  Subject to the availability of shares
under this Plan,

              (a) each person who is or becomes a member of the Board and who is
not an employee or officer of the Company (a  "Non-Employee  Director") shall be
automatically granted on the latest of (i) the date such person is first elected
to the Board,  (ii) April 29, 1994 (the "Approval Date"), or (iii) the effective
date of an initial  public  offering of the  Company's  Common Stock (such later
date being  referred to herein as the "Grant Date"),  without  further action by
the Board, an option to purchase 90,000 shares of the Common Stock, and

              (b) each person  receiving an option pursuant to clause (a) hereof
who is a Non-Employee  Director  immediately  following each  successive  annual
meeting of stockholders occurring after such person's Grant Date during the term
of this Plan shall be automatically  granted on each such annual meeting date an
option to purchase 12,000 shares of the Common Stock.

      The options to be granted under this paragraph 4 shall be the only options
ever to be granted at any time to such member  under this Plan.  Notwithstanding
anything to the  contrary  set forth  herein,  if this Plan is not approved by a
majority of the Company's stockholders present, or represented,  and entitled to
vote at the first meeting of Stockholders of the Company  following the Approval
Date,  then the Plan and the options  granted  pursuant to this  Section 4 shall
terminate  and become void,  and no further  options shall be granted under this
Plan.

      5. Option  Price.  The  purchase  price of the stock  covered by an option
granted  pursuant  to this Plan shall be 100% of the fair  market  value of such
shares on the day the option is  granted.  The  option  price will be subject to
adjustment in accordance  with the  provisions of paragraph 10 of this Plan. For
purposes of this Plan,  if, at the time an option is granted under the Plan, the
Company's  Common  Stock  is  publicly  traded,  "fair  market  value"  shall be
determined as of the last business day for which the prices or quotes  discussed
in this  sentence  are  available  prior to the date such  option is granted and
shall  mean (i) the  average  (on that  date) of the high and low  prices of the
Common Stock on the principal national  securities  exchange on which the Common
Stock is traded,  if the Common  Stock is then  traded on a national  securities
exchange;  or (ii) the last  reported  sale  price (on that  date) of the Common
Stock on the Nasdaq National Market, if the Common Stock is not then traded on a
national securities exchange;  or (iii) the closing bid price (or average of bid
prices)  last  quoted (on that date) by an  established  quotation  service  for
over-the-counter  securities,  if the Common Stock is not reported on the Nasdaq
National  Market  List.  The "fair  market  value" of the  stock  issuable  upon
exercise of an option granted  pursuant to the Plan within 120 days prior to the
time the Company's  Common Stock is publicly  traded shall be deemed to be equal
to the initial  per-share  purchase price at which the Company's Common Stock is
offered to the public.  However,  if the Common Stock is not publicly  traded at
the time an option is  granted  under the Plan,  "fair  market  value"  shall be
deemed to be the fair value of the Common Stock as  determined  by the Committee
after  taking  into  consideration  all  factors  which  it  deems  appropriate,
including, without limitation,  recent sale and offer prices of the Common Stock
in private transactions negotiated at arm's length.

      6.      Period of Option.  Unless sooner terminated in accordance with the
provisions of paragraph 8 of this Plan, an option granted hereunder shall expire
on the date which is ten (10) years after the date of grant of the option.

      7.      (a)    Vesting of Shares and Non-Transferability of Options.  
Options granted under this Plan shall not be exercisable until they become 
vested.  Options granted under clause (a) of paragraph 4 of this Plan shall
vest in the optionee and thus become exercisable, in accordance

<PAGE>


with the following schedule,  provided that the optionee has continuously served
as a member of the Board through such vesting date:

 Percentage of Option
 Shares for which
 Option Will be Exercisable                Date of Vesting

              33 1/3%                     One year from the date of grant

              66 2/3%                     Two years from the date of grant

              100%                       Three years from the date of grant

provided,  that, in the event that an optionee's  term as a director  expires at
the date of an annual meeting of stockholders within the 90-day period preceding
any vesting date, the installment of such option  corresponding  to such vesting
date shall vest on the date of such meeting.

      Options  granted under clause (b) of paragraph 4 of the Plan shall vest in
the  optionee  and thus become  exercisable  on the earlier of one year from the
date of grant or the date of the next meeting of stockholders, provided that the
optionee has  continuously  served as a member of the Board through such vesting
date.

      Notwithstanding the foregoing  provisions of this part (a) to paragraph 7,
an option  installment shall not vest with respect to any of the vesting periods
described  above in the event the  optionee  fails to attend at least 75% of the
meetings of the Board of Directors during such period.

      The  number  of  shares  as to which  options  may be  exercised  shall be
cumulative, so that once the option shall become exercisable as to any shares it
shall  continue  to be  exercisable  as to  said  shares,  until  expiration  or
termination of the option as provided in this Plan.

              (b) Non-transferability.  Any option granted pursuant to this Plan
shall  not be  assignable  or  transferable  other  than by will or the  laws of
descent and distribution or pursuant to a domestic  relations order and shall be
exercisable during the optionee's lifetime only by him or her.

      8.      Termination of Option Rights.

              (a) Except as otherwise  specified in the agreement relating to an
option,  in the  event an  optionee  ceases  to be a member of the Board for any
reason other than death or permanent disability, any then unexercised portion of
options  granted  to  such  optionee  shall,  to the  extent  not  then  vested,
immediately  terminate  and become void;  any portion of an option which is then
vested but has not been  exercised  at the time the  optionee  so ceases to be a
member of the Board may be  exercised,  to the extent it is then vested,  by the
optionee  within 90 days of the date the  optionee  ceased to be a member of the
Board; and all options shall terminate after such 90 days have expired.

              (b) In the  event  that an  optionee  ceases to be a member of the
Board by reason of his or her death or permanent disability,  any option granted
to such optionee shall be immediately and  automatically  accelerated and become
fully vested and all  unexercised  options shall be  exercisable by the optionee
(or by the optionee's personal representative,  heir or legatee, in the event of
death) until the scheduled expiration date of the option.

      9.  Exercise of Option.  Subject to the terms and  conditions of this Plan
and the option agreements, an option granted hereunder shall, to the extent then
exercisable,  be exercisable in whole or in part by giving written notice to the
Company by mail or in person addressed to Cascade  Communications  Corp., at its
principal executive offices,  stating the number of shares with respect to which
the option is being  exercised,  accompanied by payment in full for such shares.
Payment may be (a) in United States dollars in cash or by check, (b) in whole or
in part in shares of the Common Stock of the Company already owned by the person
or persons exercising the option or shares subject to the option being exercised
(subject to such restrictions and guidelines as the Board may adopt from time to
time),  valued at fair market value determined in accordance with the provisions
of paragraph 5 or (c) consistent with applicable law, through the delivery of an
assignment  to the Company of a sufficient  amount of the proceeds from the sale
of the Common Stock acquired upon exercise of the option and an authorization to
the broker or selling agent to pay that amount to the Company,  which sale shall
be at the  participant's  direction at the time of  exercise.  There shall be no
such  exercise at any one time as to fewer than one hundred  (100) shares or all
of the remaining shares then purchasable by the person or persons exercising the
option,  if fewer than one hundred (100) shares.  The Company's  transfer  agent
shall,  on  behalf  of  the  Company,  prepare  a  certificate  or  certificates
representing  such shares  acquired  pursuant  to exercise of the option,  shall
register  the  optionee  as the owner of such shares on the books of the Company
and shall cause the fully executed certificate(s) representing such shares to be
delivered to the  optionee as soon as  practicable  after  payment of the option
price  in full.  The  holder  of an  option  shall  not  have  any  rights  of a
stockholder  with  respect to the shares  covered by the  option,  except to the
extent that one or more  certificates  for such shares shall be delivered to him
or her upon the due exercise of the option.

      10.     Adjustments Upon Changes in Capitalization and Other Events.  Upon
the occurrence of any of the following events, an optionee's rights with respect
to options granted to him or her hereunder shall be adjusted as hereinafter 
provided:

              (a) Stock  Dividends  and Stock  Splits.  If the  shares of Common
      Stock shall be subdivided or combined into a greater or smaller  number of
      shares or if the Company shall issue any shares of Common Stock as a stock
      dividend on its outstanding  Common Stock,  the number of shares of Common
      Stock  deliverable  upon the  exercise of options  shall be  appropriately
      increased or decreased proportionately,  and appropriate adjustments shall
      be made in the  purchase  price per  share to  reflect  such  subdivision,
      combination or stock dividend.

              (b)  Recapitalization   Adjustments.  If  the  Company  is  to  be
      consolidated  with or acquired by another entity in a merger,  sale of all
      or  substantially  all of the Company's  assets or otherwise,  each option
      granted  under  this plan  which is  outstanding  but  unvested  as of the
      effective date of such event shall become  exercisable in full thirty (30)
      days  prior  to the  effective  date  of such  event.  In the  event  of a
      reorganization,  recapitalization,  merger,  consolidation,  or any  other
      change in the corporate  structure or shares of the Company, to the extent
      permitted  by Rule  16b-3  under  the  Securities  Exchange  Act of  1934,
      adjustments  in the number and kind of shares  authorized by this Plan and
      in the number and kind of shares  covered  by, and in the option  price of
      outstanding   options   under  this  Plan   necessary   to  maintain   the
      proportionate  interest of the optionee and preserve,  without  exceeding,
      the value of such option, shall be made. Notwithstanding the foregoing, no
      such  adjustment  shall be made which  would,  within  the  meaning of any
      applicable  provisions  of the Internal  Revenue Code of 1986, as amended,
      constitute a  modification,  extension or renewal of any Option or a grant
      of additional benefits to the holder of an Option.

              (c) Issuances of Securities.  Except as expressly provided herein,
      no issuance by the Company of shares of stock of any class,  or securities
      convertible  into  shares  of stock of any  class,  shall  affect,  and no
      adjustment by reason  thereof shall be made with respect to, the number or
      price of shares  subject  to  options.  No  adjustments  shall be made for
      dividends  paid  in cash  or in  property  other  than  securities  of the
      Company.

              (d)  Adjustments.  Upon  the  happening  of any  of the  foregoing
      events,  the class and aggregate number of shares set forth in paragraph 2
      of this Plan that are  subject to options  which  previously  have been or
      subsequently  may be granted  under this Plan shall also be  appropriately
      adjusted to reflect such events.  The Board shall  determine  the specific
      adjustments to be made under this paragraph 10 and its determination shall
      be conclusive.

      11.     Restrictions on Issuance of Shares.  Notwithstanding the 
provisions of paragraphs 4 and 9 of this Plan, the Company shall have no 
obligation to deliver any certificate or certificates upon exercise of an option
until one of the following conditions shall be satisfied:

           (i) The  issuance of shares with respect to which the option has been
      exercised  is at  the  time  of  the  issue  of  such  shares  effectively
      registered  under  applicable  Federal and state securities laws as now in
      force or hereafter amended; or

          (ii)  Counsel  for the  Company  shall have given an opinion  that the
      issuance  of such  shares is exempt from  registration  under  Federal and
      state  securities  laws as now in  force  or  hereafter  amended;  and the
      Company has complied with all applicable laws and regulations with respect
      thereto,  including  without  limitation all  regulations  required by any
      stock exchange upon which the Company's  outstanding  Common Stock is then
      listed.

      12. Legend on Certificates.  The certificates  representing  shares issued
pursuant  to the  exercise  of an option  granted  hereunder  shall  carry  such
appropriate  legend,  and  such  written  instructions  shall  be  given  to the
Company's  transfer agent, as may be deemed necessary or advisable by counsel to
the Company in order to comply with the  requirements  of the  Securities Act of
1933 or any state securities laws.

      13.  Representation of Optionee. If requested by the Company, the optionee
shall  deliver  to the  Company  written  representations  and  warranties  upon
exercise of the option that are  necessary to show  compliance  with Federal and
state securities laws,  including  representations  and warranties to the effect
that a purchase of shares under the option is made for investment and not with a
view to their distribution (as that term is used in the Securities Act of 1933).

      14. Option  Agreement.  Each option  granted under the  provisions of this
Plan shall be evidenced by an option  agreement,  which  agreement shall be duly
executed and delivered on behalf of the Company and by the optionee to whom such
option is granted. The option agreement shall contain such terms, provisions and
conditions not  inconsistent  with this Plan as may be determined by the officer
executing it.

      15.  Termination  and Amendment of Plan.  Options may no longer be granted
under this Plan after April 28,  2004,  and this Plan shall  terminate  when all
options granted or to be granted hereunder are no longer outstanding.  The Board
may at any time  terminate  this Plan or make  such  modification  or  amendment
thereof  as it deems  advisable;  provided,  however,  that the  Board  may not,
without  approval  by the  affirmative  vote of the holders of a majority of the
shares of Common  Stock  present in person or by proxy and entitled to vote at a
meeting,  (a)  increase  the maximum  number of shares for which  options may be
granted  under this Plan  (except by  adjustment  pursuant to Section  10),  (b)
materially  modify the  requirements  as to  eligibility  to participate in this
Plan, (c)  materially  increase  benefits  accruing to option holders under this
Plan, (d) change the  provisions of this Plan  regarding the  termination of the
options or the times when they may be exercised,  (e) change the  designation of
the class of persons eligible to receive options,  or otherwise change paragraph
4, or (f) amend this Plan in any manner  which  would cause Rule 16b-3 under the
Securities  Exchange  Act (or any  successor  or amended  provision  thereof) to
become  inapplicable  to this Plan; and provided  further that the provisions of
this Plan  specified  in Rule  16b-3(c)(2)(ii)(A)  (or any  successor or amended
provision thereof) under the Securities  Exchange Act of 1934 (including without
limitation,  provisions as to eligibility,  amount,  price and timing of awards)
may not be amended  more than once every six months,  other than to comport with
changes in the Internal  Revenue Code, the Employee  Retirement  Income Security
Act, or the rules  thereunder.  Termination or any  modification or amendment of
this Plan shall not, without consent of a participant,  affect his or her rights
under an option previously granted to him or her.

      16.     Withholding of Income Taxes.  Upon the exercise of an option, the
Company, in accordance with Section 3402(a) of the Internal Revenue Code, may 
require the optionee to pay withholding taxes in respect of amounts considered 
to be compensation includible in the optionee's gross income.

      17. Compliance with Regulations.  It is the Company's intent that the Plan
comply in all respects with Rule 16b-3 under the Securities Exchange Act of 1934
(or any successor or amended  provision  thereof) and any applicable  Securities
and Exchange Commission  interpretations  thereof. If any provision of this Plan
is deemed not to be in compliance  with Rule 16b-3,  the provision shall be null
and void.

      18.     Governing Law.  The validity and construction of this Plan and the
 instruments evidencing options shall be governed by the laws of the State of 
Delaware, without giving effect to the principles of conflicts of
law thereof.

      19.     Approval of Board of Directors and Stockholders of the Company.

      The Plan was adopted by the Board of  Directors  on April 29, 1994 and the
stockholders of the Company as of May 23, 1994.




<PAGE>



P                      CASCADE COMMUNICATIONS CORP.
R
O                  Proxy for Annual Meeting of Stockholders
X
Y                            May 1, 1997

               SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints Daniel E. Smith and Paul E. Blondin, and each of
them, proxies,  with full power of substitution,  to vote all shares of stock of
Cascade  Communications  Corp.  (the  "Corporation")  which the  undersigned  is
entitled to vote at the Annual Meeting of  Stockholders of the Corporation to be
held on Thursday, May 1, 1997 (the "Annual Meeting") at 9:30 a.m. local time, at
The Omni Parker House, 60 School Street, Boston, Massachusetts 02108, and at any
adjournments  thereof, upon matters set forth in the Notice of Annual Meeting of
Stockholders  and Proxy  Statement dated April 4, 1997, a copy of which has been
received by the  undersigned.  The proxies are further  authorized  to vote,  in
their  discretion,  upon such other  business  as may  properly  come before the
meeting or any adjournments thereof.

                                                 SEE REVERSE SIDE


<PAGE>


         Please mark votes as in this example
  X

THE  SHARES  REPRESENTED  BY THIS  PROXY  WILL BE VOTED AS  DIRECTED  OR,  IF NO
DIRECTION IS GIVEN,  WILL BE VOTED "FOR" THE ELECTION OF DIRECTORS AND "FOR" THE
PROPOSALS IN ITEMS 2, 3 AND 4.



<PAGE>


1. To elect  three  members  to the Board of  Directors  to serve for three year
terms as Class I Directors:

      Nominees:
      Gururaj Deshpande
      Victoria A. Brown
      Steven C. Walske

       [ ] FOR             [ ] WITHHELD


- -----------------------------
For all nominees except as noted above


2.     To approve amendments to the Corporation's 1994 Non-Employee Director 
       Stock Option Plan (the "Director Plan") to (i) amend the initial stock
       option grant from 90,000 shares to 30,000 shares for non-employee 
       Directors first elected after the Annual Meeting; (ii) to amend the stock
       option grant for each subsequent year of service on the Board of 
       Directors from 12,000 to 10,000 shares for all non-employee Directors 
       following the Annual Meeting; (iii) to limit the number of shares 
       granted for each initial stock option grant and the stock option grant
       for each subsequent year of service on the Board of Directors to the 
       amount stated above effective after the Annual Meeting; and (iv) increase
       the number of shares of Common Stock available for issuance under the 
       Director Plan from 720,000 shares to 870,000 shares.

     [ ] FOR        [  ] AGAINST   [ ] ABSTAIN

3.    To  approve  an  amendment  to  the  Corporation's  Amended  and  Restated
      Certificate of  Incorporation  increasing from  225,000,000 to 300,000,000
      the  number of  authorized  shares of Common  Stock,  par value  $.001 per
      share, of the Corporation.

     [ ]  FOR       [ ]  AGAINST  [ ] ABSTAIN


4.    To ratify the selection of the firm of
       Coopers & Lybrand L.L.P. as auditors
       for the fiscal year ending December
       31, 1997.

     [ ] FOR       [ ]  AGAINST   [ ] ABSTAIN

5.    To transact such other business as may
       properly come before the meeting and
       any adjournment thereof.

         [ ]   MARK HERE FOR ADDRESS
               CHANGE AND NOTE BELOW

               _________________________
               _________________________


        [ ]   MARK HERE IF YOU PLAN
              TO ATTEND THE MEETING

If signing as attorney,  executor,  trustee or  guardian,  please give your full
title as such. If stock is held jointly, each owner should sign.


- ---------------------------------
Signature                                          Date

- ----------------------------------
Signature                                          Date


<PAGE>


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