Document:

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                              CONSULTANT AGREEMENT
                              --------------------

     This Agreement dated as of November 1, 1999 is made between PacketPort,
Inc., a Delaware corporation, with offices presently located at 587 Connecticut
Avenue, Norwalk, Connecticut 06854, hereinafter referred to as "PacketPort" or
"The Company," and Thomas Cerabona, whose address is 3061 Dahlia Court, Yorktown
Heights, New York 10598, hereinafter referred to as "cerabona" or "the
consultant."

                               W I T N E S S E T H

     WHEREAS, PacketPort is acquiring a substantial stockholder interest in the
company known as Linkon Corporation, hereinafter referred to as "Linkon" and
will be advancing funds to Linkon to pay certain of its creditors on a
compromised basis;

     WHEREAS, the Consultant was formerly employed by Linkon, was the recipient
of rights in the form of warrants and/or options to purchase securities issued
by Linkon; and may be owed compensation for services rendered to Linkon;

     WHEREAS, PacketPort desires to utilize the services of Cerabona in the
capacity of a consultant to the Company for a period of at least one year
provided he releases all other claims against linkon for compensation in any
form;

     WHEREAS, the Consultant has agreed to be retained by PacketPort for the
purpose of providing consulting services related to his knowledge of the
business and technology of Linkon;

     NOW, THEREFORE, in consideration of the mutual covenants, promises and
agreements set forth in this Consultant Agreement, the parties agree as follows:

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     19.  Incorporation of "WHEREAS" clauses. The representations, terms and
undertakings set forth in the WHEREAS clauses of this Agreement are incorporated
herein by reference as though recited verbatim and at length.

     20.  CONSULTATION SERVICES. The Company hereby employs the Consultant to
perform the following services in accordance with the terms and conditions set
forth in this agreement:

     21.  TERM OF AGREEMENT. The term of this Agreement will commence November
1, 1999 and will end October 31, 2000.

     22.  TIME DEVOTED BY CONSULTANT. It is anticipated that Cerabona will not
perform services on a regular basis but only from time to time in order to
fulfill his obligation under this Agreement. The particular amount of time in
which the services are rendered should be at the convenience of the Consultant.

     23.  PLACE WHERE SERVICES WILL BE RENDERED. Cerabona will perform the
services contemplated by this Agreement at the offices of PacketPort or at his
own office wherever it may be more convenient for him.

     24.  COMPENSATION PAID TO CONSULTANT. Cerabona will be paid the sum of
$50,000 as a retainer fee for entering into this one year term agreement.
Payment of the consulting fee will be as follows: $26,000 upon execution of this
Agreement and six month payments thereafter of $4,000 each. In the event the
Consultant incurs expenses, he should submit an itemized statement setting forth
the expenses incurred and the Company will pay the Consultant the amounts due as
indicated by statements submitted by the Cerabona on a month to month basis.

     25.  INDEPENDENT CONTRACTOR. The parties agree that Cerabona will act as an
independent contractor in the performance of his duties under this Agreement.
Accordingly, the Consultant shall be responsible for payment of all

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payroll taxes, including federal, state and local taxes, arising out of the
Consultant's activities in accordance with this Agreement.

     26.  CONFIDENTIAL INFORMATION. Cerabona agrees that any information
received by him during the course of carrying out the terms and conditions of
this Agreement which concerns the personal, financial or other affairs of the
Company will be treated by the Consultant in full confidence and will not be
revealed to any other person, firm or organization.

     27.  EMPLOYMENT OF OTHERS. The Company may from time to time request that
Cerabona arrange for the services of others. All expenses incurred to the
Consultant for those services will be paid by the Company but in no event shall
the Consultant employ other persons without the prior authorization of
management.

     28.  CONTINUANCE OF DIRECTORS AND OFFICERS INSURANCE COVERAGE.
PacketPort agrees that, if it is contractually possible to do so, it shall take
such steps as would be necessary and appropriate to continue the current D&O
insurance policy in favor of the previous directors and officers of Linkon for
the twelve month term of this Agreement.

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     29.  GENERAL RELEASE. In exchange for the compensation to be received by
the Consultant, Cerabona agrees to deliver to the Company a general release
executed by him and acknowledged in the form attached as Exhibit "A" to this
Agreement.

     30.  MISCELLANEOUS. This Agreement constitutes the entire Agreement between
the parties. No other statement, representation, warranty or covenant has been
made by either party with respect to the Consultant.

     31.  INDEMNIFICATION. PacketPort agrees that it will indemnify and hold
harmless Cerabona from and against any and all losses, claims, damages,
liabilities and expenses, joint or several (including all reasonable fees of
counsel and other expenses incurred by him in connection with the preparation
for, or defense of, any claim, action or proceeding, whether or not resulting in
any liability), to which such Consultant may become subject under any applicable
federal or state law, or otherwise, caused by or arising out of any action or
failure to take action by the Company and/or Linkon, except that the Company
will not be liable hereunder to the extent that any loss, claim, damage,
liability or expense is found to have resulted from gross negligence or bad
faith on the part of Cerabona. PacketPort also agrees that it will cause the
Board of Directors of Linkon to authorize a similar indemnification provision in
favor of the Consultant.

     32.  AMENDMENTS. No amendments or modifications of the terms and conditions
of this Agreement shall be valid and enforceable unless set forth in writing.

     33.  SEVERABILITY. In the event that any provision of this Agreement is
held invalid, unenforceable or modified by any court of competent jurisdiction,

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it shall be construed as if such invalid, unenforceable or modified provision
had been more narrowly drawn so as not to invalidate or make unenforceable or
modify any other provision.

     34.  GOVERNING LAW. This Agreement shall be governed by and construed in
accordance with the laws of the State of Connecticut without regard to conflict
of laws principles.

     35.  CONSULTATION WITH COUNSEL. The Consultant acknowledges that prior to
executing this Agreement he has had the opportunity to consult with independent
counsel of his personal choice.

     36.  NO RIGHT TO ASSIGN AGREEMENT. The Consultant may not assign, transfer,
pledge, encumber, hypothecate or otherwise dispose of this Agreement. Any
attempted delegation or disposition of any of this rights under this Agreement
shall be null and void and without effect.

     IN WITNESS WHEREOF, this Consultant Agreement has been executed by the
parties hereto the date first above written.

Witnessed or Attested by:           PACKETPORT, INC.

__________________________          ____________________________
Robert H. Jaffe, Secretary          Ronald A. Durando, President

                                  ______________________________
                                  Thomas V. Cerabona, Consultant
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                                   EXHIBIT 4.2

                                    AMENDMENT
                                       OF
                                RIGHTS AGREEMENT

THIS AMENDMENT of the Rights Agreement dated December 15, 1995 (herein
"Amendment"), is made as of May 1, 2000, by and between EXAR Corporation, a
corporation incorporated under the laws of the State of Delaware, having its
principal office at 48720 Kato Road, Fremont, California 94538 (herein
"Company"), and Fleet National Bank (f/k/a Bank Boston, N.A., f/k/a The First
National Bank of Boston), a National Banking Association (herein "Rights
Agent"). This Amendment is pursuant to Section 27, Supplements and
Amendments, of the Rights Agreement dated December 15, 1995, by and between
the Company and Rights Agent (herein "Rights Agreement"), which permits the
parties to modify its terms by a written document signed by both parties.

WHEREAS, the Company entered into a Rights Agreement with the Rights Agent
whereunder the Company issued to holders of its common stock a dividend of
rights (the "Rights") to purchase shares of a newly established and
designated series of Preferred Shares as set forth in the Rights Agreement;

WHEREAS, the initial exercise price of the Rights under the Rights Agreement
is $79.00 (after giving effect to the 3-for-2 stock split on February 15,
2000) per Right; and

WHEREAS, after consultation with the Company's legal counsel, Cooley Godward
LLP, and independent financial advisor, Banc of America Securities LLC, the
Board of Directors deems it desirable and in the best interests of the
Company and its stockholders that the exercise price of the Rights Agreement
be amended.

IN CONSIDERATION of the mutual promises exchanged, the parties agree as
follows:

1.       GENERAL

Except as otherwise provided in this Amendment, the contractual relationship
         of the parties will continue to be governed by the terms and
         conditions of the Rights Agreement. This Amendment shall not be
         construed as a modification of any provision of the Rights Agreement
         unless such provision, or portion thereof, is expressly modified
         herein.

2.       CERTAIN DEFINITIONS

The Company and Rights Agent hereby agree to delete Sections 1(d) and (f) in
         their entirety and replace them with the following:

         "(d) "Business Day" shall mean any day other than a Saturday, a
         Sunday, or a day on which banking institutions in the Commonwealth
         of Massachusetts are authorized or obligated by law or executive
         order to close."

         "(f) "Close of Business" on any given date shall mean 5:00 P.M.,
         Eastern time, on such date; PROVIDED, HOWEVER, that if such date is
         not a Business Day it shall mean 5:00 P.M., Eastern time, on the
         next succeeding Business Day."

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3.       APPOINTMENT OF RIGHTS AGENT

         The Company and Rights Agent hereby agree to delete the last sentence
         in Section 2 in its entirety and replace it with the two (2) following
         sentences:

                  "The Company may from time to time appoint such co-Rights
                  Agents as it may deem necessary or desirable, upon ten (10)
                  days' prior written notice to the Rights Agent. The Rights
                  Agent shall have no duty to supervise, and shall in no event
                  be liable for, the acts or omissions of any such co-Rights
                  Agent."

4.       EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF RIGHTS

The Company and Rights Agent hereby agree to delete Section 7(b) in its
entirety and replace it with the following:

         "(b) the Purchase Price for each one one-hundredth of a Preferred
         Share pursuant to the exercise of a Right shall initially be $375.00
         (after giving effect to the 3-for-2 stock split on February 15,
         2000), shall be subject to adjustment from time to time as provided
         in Sections 11 and 13 hereof, and shall be payable in lawful money
         of the United States of America in accordance with paragraph (c)
         below."

5.       NOTICES

         The address noted for the Rights Agent shall be deleted and replaced
         with the following:

         "Fleet National Bank
         c/o EquiServe Limited Partnership
                  150 Royall Street
                  Canton, Massachusetts  02021
                  Attention:  Client Administrator"

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the
day and year first above written, in counterparts, each of which shall be
considered an original, but all of which together shall constitute one
instrument.

       EXAR CORPORATION            FLEET NATIONAL BANK (F/K/A BANK
                                   BOSTON, N.A., F/K/A THE FIRST NATIONAL BANK
                                   OF BOSTON)

By:                            By:
   ------------------------       -----------------------
Executive Vice President
Title:   and CFO             Title:
      ---------------------        ----------------------

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