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

Exhibit 10.15

ELEVENTH AMENDMENT
TO ADDITIONAL SENIOR SECURITY AGREEMENT
 
ELEVENTH AMENDMENT, dated AS OF October 1, 2008 (the "Amendment"), to the
Additional Senior Security Agreement referred to below, by and among (i) GENERAL
DATACOMM INDUSTRIES, INC., a Delaware corporation, GENERAL DATACOMM, INC., a
Delaware corporation ("GDC"), 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 "Debtors”) and Howard S. Modlin
(“Modlin”) and John L. Segall (together with their successors and assigns the
“Secured Party”)
 
WHEREAS, GDC and the other Debtors have requested previously on October 1, 2008
that Modlin as a Secured Party loan GDC an additional $250,000, subject to (i)
the execution and delivery of this Amendment by the Debtors, 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.             Definitions in Amendment.  Any capitalized term used herein and
not defined shall have the meaning assigned to it in the Additional Senior
Security Agreement dated December 30, 2003 between the Debtors and the Secured
Party as heretofore amended  ( the “Security Agreement”).
 
2.             Loans.  In consideration of the principal amount of $250,000
loaned October 1, 2008 by Modlin as a Secured Party to GDC reflected by a demand
note of $250,000 bearing interest at 10% per annum from the date hereof, GDC
covenants and agrees such funds are and were to be used for working capital
purposes.
 
3.             Indebtedness Secured.   Paragraph 3 of the Security Agreement
entitled “Indebtedness Secured” is amended by replacing the last sentence
thereof in its entirety by the following new sentence “The Security Interest
granted by Debtors secures payment of any and all indebtedness of Parent and its
subsidiaries incurred under the Amended and Restated Notes, and demand
promissory notes dated April 30, 2008, May 13, 2008, September 18, 2008 and
October 1, 2008 in amounts of $175,000, $75,000, $175,000 and $250,000, all of
which notes total $2,755,945.21 (the “Notes.”)

4.             Miscellaneous.
 
(a)           Continued Effectiveness of Security Agreement.  Except as
otherwise expressly provided herein, the Security Agreement shall continue to
be, in full force and effect and is hereby ratified and confirmed in all
respects.  Except as expressly provided herein, the execution, delivery and
effectiveness of this Amendment shall not constitute an amendment of any other
provision of the Security Agreement.

 
 

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

 
 
(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.
 
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:
Vice President
           
GENERAL DATACOMM, INC.,
   
a Delaware corporation
           
By
             
Title:
Vice President
           
GDC HOLDING COMPANY, LLC,
   
a Delaware limited liability company
               
By
             
Title:
Vice President
           
GDC FEDERAL SYSTEMS, INC.,
   
a Delaware corporation
               
By
             
Title:
Vice President
           
GDC NAUGATUCK, INC.,
   
a Delaware corporation
               
By
             
Title:
Vice President

 

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

 

   
GDC REALTY, INC.,
   
a Texas corporation
               
By
             
Title:
Vice President
           
Secured Party
                 
Howard S. Modlin
                 
John L. Segall

 
 

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