EXHIBIT 4(b)(6)

                           GMAC COMMERCIAL CREDIT LLC
                           1290 Avenue of the Americas
                            New York, New York 10104

                                                as of September 24, 2002

TII NETWORK TECHNOLOGIES, INC.
1385 Akron Street
Copiague, New York 11726

                Re: Amendment to Loan Documents
                    ---------------------------

Gentlemen:

     Reference  is made to  certain  financing  arrangements  by and among  GMAC
COMMERCIAL  CREDIT LLC,  formerly  known as BNY  FACTORING  LLC, as successor by
merger to BNY Financial Corporation ("Lender"), TII NETWORK TECHNOLOGIES,  INC.,
formerly known as TII Industries,  Inc., ("Borrower") and TII Corporation (which
was subsequently dissolved), pursuant to certain financing agreements, including
that certain Revolving Credit,  Term Loan and Security Agreement dated April 30,
1998 (the "Credit Agreement"), together with various other agreements, documents
and instruments  referred to therein or at any time executed and/or delivered in
connection therewith or related thereto (all of the foregoing, together with the
Credit  Agreement,  as the same has been, is hereby being,  and may hereafter be
amended,  restated,  renewed, extended,  supplemented,  substituted or otherwise
modified, collectively, the "Loan Documents").

     Borrower has requested that Lender agree to amend certain provisions of the
Loan Documents, all as more fully set forth in this letter Re: Amendment to Loan
Documents  ("Amendment").  Lender has agreed to accommodate  Borrower's  request
subject to the terms and conditions hereof.

     1.   Amendments.
          ----------

          (a) Section 6.5 of the Credit Agreement is hereby amended and restated
in its entirety to read as follows:

               "6.5  Net  Worth.   Cause  to  be   maintained  at  all  times  a
          consolidated Net Worth in an amount (the "Minimum Net Worth") not less
          than  (a)  for  Borrower's  fiscal  quarter  ending  March  29,  2002,
          $17,750,000,  (b) for Borrower's  fiscal quarter ending June 28, 2002,
          $14,000,000,   and  (c)  for  each  of  Borrower's   fiscal   quarters
          thereafter,  an  amount  equal  to the sum of the



          Minimum Net Worth required for the immediately previous fiscal quarter
          plus  fifty  percent  (50%) of Net Income (to the extent Net Income is
          positive)   for   such    immediately    previous    fiscal   quarter.
          Notwithstanding  anything in this Agreement to the contrary,  Borrower
          shall be deemed to be in compliance with this Section 6.5 at all times
          during  any  fiscal  quarter  other  than the last day of such  fiscal
          quarter (each such time  hereinafter an "Interim  Date") if, as of any
          Interim  Date,  Borrower's  consolidated  Net  Worth is not more  than
          $150,000 less than the applicable Minimum Net Worth required hereunder
          as of the  last  day of such  fiscal  quarter.  Nothing  herein  shall
          release Borrower from its obligation to maintain the requisite Minimum
          Net Worth as of the last day of each fiscal quarter."

          (b) The first  sentence  of Section  13.1 of the Credit  Agreement  is
hereby amended and restated in its entirety to read as follows:

               "13.1 Term. This  Agreement,  which shall inure to the benefit of
          and shall be binding  upon the  respective  successors  and  permitted
          assigns of each of the Borrower and the Lender, shall become effective
          on the date hereof and shall  continue in full force and effect  until
          September  30, 2003 (the "Term")  unless  sooner  terminated as herein
          provided."

     2. Representations, Warranties and Covenants. In addition to the continuing
representations,  warranties and covenants heretofore made by Borrower to Lender
pursuant  to the  Loan  Documents,  Borrower  hereby  represents,  warrants  and
covenants with and to Lender as follows (which  representations,  warranties and
covenants are continuing and shall survive the execution and delivery hereof and
shall be incorporated into and made a part of the Loan Documents):

          (a) No Event of Default  exists or has occurred and is  continuing  on
the date of this amendment upon giving effect to the terms of this amendment.

          (b) This  Amendment  has been duly  executed and delivered by Borrower
and is in full force and effect as of the date hereof,  and the  agreements  and
obligations of Borrower contained herein constitute the legal, valid and binding
obligations  of Borrower  enforceable  against  Borrower in accordance  with its
terms.

          (c)  Except as  specifically  set forth  herein,  no other  changes or
modifications  to the Loan  Documents are intended or implied,  and in all other
respects,  the Loan Documents  shall continue to remain in full force and effect
in  accordance  with their  respective  terms as of the date  hereof.  Except as
specifically set forth herein,  nothing contained herein shall evidence a waiver
or amendment by Lender of any other  provision of the Loan  Documents  nor shall
anything contained herein be construed as a consent by Lender to any transaction
other than that specifically consented to herein.


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          (d) The  terms  and  provisions  of this  Amendment  shall  be for the
benefit of the parties hereto and their  respective  successors and assigns;  no
other  person,  firm,  entity or  corporation  shall  have any right  benefit or
interest under this  amendment.  This  Amendment may be signed in  counterparts,
each of which shall be an original  and all of which when taken  together  shall
constitute one  amendment.  In making proof of this  Amendment,  it shall not be
necessary  to  produce or account  for more than one  counterpart  signed by the
party to be charged.

          (e) This Amendment sets forth the entire  agreement and  understanding
of the  parties  with  respect to the matter set forth  herein.  This  Amendment
cannot be changed, modified, amended or terminated except in writing executed by
the party to be charged.

     3. Amendment Fee. In  consideration of the amendments to the Loan Documents
set forth herein, Borrower unconditionally agrees to pay an amendment fee in the
amount of $15,000,  which  amendment fee shall be fully earned as of the date of
hereof,  shall not be  subject  to refund,  rebate or  proration  for any reason
whatsoever, and shall be charged by Lender to Borrower as of the date hereof.

     IN WITNESS WHEREOF,  Lender and Borrower have executed this Amendment as of
the day and year first above written.

                                        GMAC COMMERCIAL CREDIT LLC

                                        By: /s/ David Duffy
                                           -------------------------------------
                                        Title: Vice President


ACKNOWLEDGED AND AGREED:

TII NETWORK TECHNOLOGIES, INC.


By: /s/ Kenneth A. Paladino
    -------------------------------
Title: Vice President Finance


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