Document:

Exhibit 4.2
                                                                     -----------

                       $125,000 NEGOTIABLE PROMISSORY NOTE

                                                           March 1, 2004

         For value received, on February 28, 2006, General DataComm Industries,
Inc, having an office at 6 Rubber Avenue, Naugatuck CT 06770 ("Payor"), promises
to pay to the order of John L. Segall, residing at 11 Blackstone Drive, East
Norwalk, CT 06855 ("Payee"), with interest at the rate of 10% per annum on the
unpaid balance thereof from March 1, 2004, the principal sum of $125,000 in
lawful money of the United States of America. This Note may be prepaid at any
time without penalty or premium. Interest which accrues during each calendar
month shall be paid on the first day of the following calendar month during the
term of this Note except the first interest payment shall be made July 1, 2004.
This Note evidences a loan made to Payor by Payee in the sum of $125,000 for the
purpose of Payor paying and replacing indebtedness of a similar amount owed to
Ableco Finance, LLC, as Agent, and the Lenders, under Loan and Security
Agreement dated as of August 20, 2002.

         1. Payment of this Note is unconditional and shall be made without
defense, counterclaim or offset, any defense to be asserted in a separate suit.
If payment is not made at maturity or upon the occurrence of a Default, then
interest shall accrue from such date until paid in full at the rate of 12% per
annum or the maximum permitted by law, whichever is less. This Note is secured
by a security agreement dated December 30, 2003, as amended.

         2.(a) At the option of the Payee or holder the principal amount of this
Note may be converted in whole or in part into Common Stock of the Payor at the
conversion price of $.8625 per share by written notice designating the amount
thereof being converted in minimum multiples of $10,000 principal amount or
integral multiples thereof. The Payee or holder acknowledges any shares of
Common Stock issued on conversion will not be registered under the Securities
Act of 1933, as amended and must be held for investment without a view to
distribution and the certificates for such shares shall bear a restrictive
legend therefor. The Payor shall issue a replacement note for this Note in the
event of any conversion for the remaining balance thereof

                  (b) (a) If additional shares of Common Stock are issued by the
Payor pursuant to a stock split or stock dividend in excess of 5% in any one
fiscal year of the Payor, the number of shares of Common Stock then issuable on
conversion shall be increased proportionately with no increase in the principal
amount of this Note being converted. In the event that the shares of common
stock of the Payor are reduced at any time by a combination of shares, the

<PAGE>

number of shares of common stock then issuable on conversion herein shall be
reduced proportionately with no reduction in the principal amount of this Note
being converted. If the Payor shall be reorganized, consolidated or merged with
another corporation, or if all or substantially all of the assets of the Payor
shall be sold or exchanged, the Payee shall, at the time of issuance of the
stock under such a corporate event, be entitled to receive upon the conversion
of this Note, the same number and kind of shares of stock or the same amount of
property, cash or securities as he would have been entitled to receive upon the
happening of any such corporate event as if he had been, immediately prior to
such event, the holder of the number of shares receivable on conversion of this
Note.

         3. The term "Default" as used herein shall mean the failure of Payor to
pay the principal or interest on this Note when due or the failure of Payor to
perform any other obligation (including the obligations under Paragraphs 2(a) or
(b) when required, or the security agreement securing this Note) or if an Event
of Default exists under the Payor's Loan and Security Agreement with Ableco
Finance LLC and such indebtedness is accelerated.

         4. Payor agrees to pay all costs and expenses of collection, including
reasonable attorney's fees, in the event of acceleration of this Note by Payee
or holder following Default.

         5. Presentation for payment, notice of dishonor, protest and notice of
protest are hereby waived.

         6. This Note shall be governed by the laws of the State of Connecticut.
The Payor of this Note hereby submits to the exclusive jurisdiction of the
courts of general jurisdiction of the State of Connecticut , and hereby waives,
and agrees not to assert, as a defense in any action, suit or proceeding for the
interpretation or enforcement of this Note, that it is not subject thereto or
that such action, suit or proceeding may not be brought or it is not
maintainable in such courts, or that this Note may not be enforced in or by such
courts, or that the suit, action or proceeding is brought in an inconvenient
forum, or that the venue of the suit, action or proceeding is improper. Service
of process with respect thereto may be made upon Payor by mailing a copy thereof
by registered or certified mail, postage prepaid, to such party at its address
as provided above.

                                    GENERAL DATACOMM INDUSTRIES, INC.

                                    By: /s/ WILLIAM G. HENRY
                                        ----------------------------------------
                                        William G. Henry
                                        Title: Vice President, Finance
                                               and Administration

                                       2Exhibit 10.2
                                                                    ------------

                                SECOND AMENDMENT
                                TO LOAN AGREEMENT

                  SECOND AMENDMENT, dated as of March 1, 2004 (the "Amendment"),
to the Loan Agreement referred to below, by and among (i) GENERAL DATACOMM
INDUSTRIES, INC., a Delaware corporation, GENERAL DATACOMM, INC., a Delaware
corporation ("GDC"), DATACOMM LEASING CORPORATION, a Delaware corporation, GDC
HOLDING COMPANY, LLC, a Delaware limited liability company, GDC NAUGATUCK, INC.,
a Delaware corporation, GDC FEDERAL SYSTEMS, INC., a Delaware corporation, GDC
REALTY, INC., a Texas corporation (each, a "Borrower" and collectively, the
"Borrowers"), (ii) the lenders party thereto from time to time (the "Lenders"),
and (iii) ABLECO FINANCE LLC, as agent for the Lenders (in such capacity, the
"Agent").

                  WHEREAS, the Borrowers are obligated to repay certain
indebtedness owing to the Agent and the Lenders under that certain Loan and
Security Agreement dated as of August 20, 2002 (as amended, supplemented and
otherwise modified from time to time, the "Loan Agreement");

                  WHEREAS, GDC has requested that the Lenders permit (i) GDC's
incurrence of additional loans to be made by Howard S. Modlin and John L. Segall
in an aggregate principal amount of $250,000 (the "Affiliate Loans") for the
payment of and to replace $250,000 of the Indebtedness owed the Lender and (ii)
the grant by the Borrowers of Liens on their assets to secure the repayment of
the Affiliate Loans, all in accordance with the promissory notes and the
security agreement attached hereto as Exhibit A;

                  WHEREAS, the Lenders are willing to consent to the
transactions described in the immediately preceding paragraph, subject to (i)
the execution and delivery of this Amendment by the Borrowers, and (ii) the
other terms and conditions set forth in this Amendment;

                  NOW THEREFORE, in consideration of the premises and other good
and valuable consideration, the parties hereto hereby agree as follows:

         1.1      Definitions in Amendment. Any capitalized term used herein and
not defined shall have the meaning assigned to it in the Loan Agreement.

         1.2      Affiliate Loans. Section 1.1 of the Loan Agreement is hereby
amended by replacing the definition of the term "Affiliate Loans" to read in its
entirety as follows:

                           "'Affiliate Loans" means the loans made by Howard S.
         Modlin and John L. Segall to the Parent, on or about December 30, 2003,
         in an aggregate principal amount of $600,000, which loans are evidenced
         by promissory notes issued by the Parent and dated on or about December
         30, 2003" and the loans made by Howard S. Modlin and John L. Segall to
         the Parent on or about March 1, 2004 in an aggregate principal amount

<PAGE>

         of $250,000 which loans are evidenced by Promissory Notes issued by the
         Parent and dated on or about March 1, 2004."

         1.3      Indebtedness; Amendments. (a) Section 7.1(g) of the Loan
Agreement is hereby amended in its entirety to read as follows:

                           "(g) the Affiliate Loans, provided that (i) the
         aggregate principal amount of the Affiliate Loans shall not exceed
         $850,000 and (ii) the Borrowers shall not pay any principal of,
         interest on or any other amount in respect of such Affiliate Loans if
         an Event of Default exists or would arise after giving effect to any
         such payment."

         2.       Conditions. The effectiveness of this Amendment is subject to
the fulfillment, in a manner satisfactory to the Agent, of each of the following
conditions precedent (the date such conditions are fulfilled or waived by the
Lender is hereinafter referred to as the "Amendment Effective Date"):

                  (a)      Representations and Warranties; No Event of Default.
The representations and warranties contained herein, in Section 5 of the Loan
Agreement and in each other Loan Document and certificate or other writing
delivered to the Agent or any Lender pursuant hereto on or prior to the
Amendment Effective Date shall be correct on and as of the Amendment Effective
Date as though made on and as of such date, except to the extent that such
representations and warranties (or any schedules related thereto) expressly
relate solely to an earlier date (in which case such representations and
warranties shall be true and correct on and as of such date); and no Default or
Event of Default shall have occurred and be continuing on the Amendment
Effective Date or would result from this Amendment becoming effective in
accordance with its terms.

                  (b)      Delivery of Documents. The Lender shall have received
on or before the Amendment Effective Date the following, each in form and
substance satisfactory to the Agent and, unless indicated otherwise, dated the
Amendment Effective Date:

                           (i)      counterparts of this Amendment duly executed
by the Borrowers and the Lenders; and

                           (ii)     such other agreements, instruments,
approvals, opinions and other documents as the Agent may reasonably request.

                  (c)      Proceedings. All proceedings in connection with the
transactions contemplated by this Amendment, and all documents incidental
thereto, shall be satisfactory to the Agent and its special counsel, and the
Agent and such special counsel shall have received all such information and such
counterpart originals or certified copies of documents, and such other
agreements, instruments, approvals, opinions and other documents, as the Agent
or such special counsel may reasonably request.

                                       2
<PAGE>

         3.       Representations and Warranties. Each Borrower hereby
represents and warrants to the Agent and the Lenders as follows:

                  (a)      Representations and Warranties; No Event of Default.
The representations and warranties herein, in Section 5 of the Loan Agreement
and in each other Loan Document and certificate or other writing delivered to
the Agent or any Lender pursuant hereto on or prior to the Amendment Effective
Date are correct on and as of the Amendment Effective Date as though made on and
as of such date, except to the extent that such representations and warranties
(or any schedules related thereto) expressly relate solely to an earlier date
(in which case such representations and warranties are true and correct on and
as of such date); and no Default or Event of Default has occurred and is
continuing on the Effective Date or would result from this Amendment becoming
effective in accordance with its terms.

                  (b)      Organization, Good Standing, Etc. Such Borrower (i)
is a corporation duly organized, validly existing and in good standing under the
laws of the state of its organization, (ii) has all requisite power and
authority to execute, deliver and perform this Amendment and the other Loan
Documents to which it is a party being executed in connection with this
Amendment, and to perform the Loan Agreement, as amended hereby, and (iii) is
duly qualified to do business and is in good standing in each jurisdiction in
which the character of the properties owned or leased by it or in which the
transaction of its business makes such qualification necessary except where the
failure to be so qualified reasonably could not be expected to have a Material
Adverse Change.

                  (c)      Authorization, Etc. The execution, delivery and
performance by such Borrower of this Amendment and each other Loan Document to
which it is a party being executed in connection with this Amendment, and the
performance by such Borrower of the Loan Agreement, as amended hereby, (i) have
been duly authorized by all necessary action, (ii) do not and will not
contravene such Borrower's charter or by-laws, any applicable law or any
contractual restriction binding on or otherwise affecting it or any of its
properties, (iii) do not and will not result in or require the creation of any
Lien (other than pursuant to any Loan Document) upon or with respect to any of
its properties, and (iv) do not and will not result in any suspension,
revocation, impairment, forfeiture or nonrenewal of any permit, license,
authorization or approval applicable to its operations or any of its properties.

         4.       Miscellaneous.

                  (a)      Continued Effectiveness of the Loan Agreement. Except
as otherwise expressly provided herein, the Loan Agreement and the other Loan
Documents are, and shall continue to be, in full force and effect and are hereby
ratified and confirmed in all respects, except that on and after the Amendment
Effective Date (i) all references in the Loan Agreement to "this Agreement",
"hereto", "hereof", "hereunder" or words of like import referring to the Loan
Agreement shall mean the Loan Agreement as amended by this Amendment, and (ii)
all references in the other Loan Documents to which any Borrower is a party to
the "Loan Agreement", "thereto", "thereof", "thereunder" or words of like import
referring to the Loan Agreement shall mean the Loan Agreement as amended by this
Amendment. Except as expressly provided herein, the execution, delivery and
effectiveness of this Amendment shall not operate as an amendment of any right,
power or remedy of the Lender under the Loan Agreement or any other Loan
Document, nor constitute an amendment of any provision of the Loan Agreement or
any other Loan Document.

                                       3
<PAGE>

                  (b)      Counterparts. This Amendment may be executed in any
number of counterparts and by different parties hereto in separate counterparts,
each of which shall be deemed to be an original, but all of which taken together
shall constitute one and the same agreement.

                  (c)      Headings. Section headings herein are included for
convenience of reference only and shall not constitute a part of this Amendment
for any other purpose.

                  (d)      Governing Law. This Amendment shall be governed by,
and construed in accordance with, the law of the State of New York.

                  (e)      Costs and Expenses. The Borrowers jointly and
severally agree to pay on demand all fees, costs and expenses of the Agent and
each Lender in connection with the preparation, execution and delivery of this
Amendment and the other related agreements, instruments and documents.

                  (f)      Amendment as Loan Document. Each Borrower hereby
acknowledges and agrees that this Amendment constitutes a "Loan Document" under
the Loan Agreement. Accordingly, it shall be an Event of Default under the Loan
Agreement if (i) any representation or warranty made by a Borrower under or in
connection with this Amendment shall have been untrue, false or misleading in
any material respect when made, or (ii) a Borrower shall fail to perform or
observe any term, covenant or agreement contained in this Amendment.

                  (g)      Waiver of Jury Trial. EACH BORROWER, THE AGENT AND
THE LENDER EACH HEREBY IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY
ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED ON CONTRACT, TORT OR
OTHERWISE) ARISING OUT OF OR RELATING TO THIS AMENDMENT OR THE ACTIONS OF THE
AGENT OR ANY LENDER IN THE NEGOTIATION, ADMINISTRATION, PERFORMANCE OR
ENFORCEMENT HEREOF.

                                       4
<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be executed and delivered as of the date first above written.

                                            Borrowers:
                                            ---------

                                            GENERAL DATACOMM INDUSTRIES, INC.,
                                            a Delaware corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            GENERAL DATACOMM, INC.,
                                            a Delaware corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            DATACOMM LEASING CORPORATION,
                                            a Delaware corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            GDC HOLDING COMPANY, LLC,
                                            a Delaware limited liability company

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            GDC FEDERAL SYSTEMS, INC.,
                                            a Delaware corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

<PAGE>

                                            GDC NAUGATUCK, INC.,
                                            a Delaware corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            GDC REALTY, INC.,
                                            a Texas corporation

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

                                            Agent and Lender:
                                            ----------------

                                            ABLECO FINANCE LLC,
                                            a Delaware limited liability
                                            company, on behalf of itself and its
                                            affiliated assigns

                                            By
                                               ---------------------------------

                                            Title:
                                                  ------------------------------

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