PORTA SYSTEMS CORP
8-K, 1998-02-06
TELEPHONE & TELEGRAPH APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549

                                    Form 8-K

                                 Current Report

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

        Date of Report (Date of earliest event reported): January 2, 1998

                               Porta Systems Corp.
             (Exact name of Registrant as Specified in its Charter)

          Delaware                    1-8191                   11-2203988
(State or other jurisdiction       (Commission               (IRS Employer
      of incorporation               File No.)             Identification No.)

                575 Underhill Boulevard, Syosset, New York 11791
                     (Address of Principal Executive Office)

       Registrant's telephone number, including area code: (516) 364-9300.

<PAGE>

Item 5.  Other Events.

      As reported in the Company's Form 10-Q for the quarter ended September 30,
1997,  the Company  executed a  Supplemental  Indenture  dated October 10, 1997,
pursuant to which the  conversion  price of the  Company's  Zero  Coupon  Senior
Subordinated  Notes Due  January 2, 1998 (the  "Zero  Coupon  Notes")  Notes was
reduced to $3.65 from $6.55.  As of January 29, 1998,  the Company had issued an
aggregate of 6,464,415  shares of Common  Stock upon  conversion  of Zero Coupon
Notes in the principal amount of approximately $23.6 million.

      On  January 2, 1998,  the  maturity  date of the Zero  Coupon  Notes,  the
Company paid the remaining $2.8 million of Zero Coupon Notes.

      In January 1998, the Company raised $6 million from the private  placement
of 60 Units at $100,000 per Unit.  Each Unit  consisted of (a) the Company's 12%
Subordinated Note due January 3, 2000 (a "12% Note"), in the principal amount of
$100,000,  and (b) a  Series  B Common  Stock  Purchase  Warrant  (a  "Series  B
Warrant") to purchase  10,000  shares of Common Stock at $3.00 per share through
December 31, 2002. In the event that any 12% Note is  outstanding  one year from
the date on which such 12% Note is issued (the  "Anniversary Date of the Note"),
the Company shall issue to the holder of such 12% Note on the  Anniversary  Date
of the Note a Series C Warrant to  purchase  25 shares of Common  Stock for each
$1,000 principal amount of 12% Notes  outstanding on the Anniversary Date of the
Note.  The Series C Warrant will have an exercise  price equal to the average of
the  closing  prices  of the  Common  Stock  on each of the  five  trading  days
preceding  the  Anniversary  Date of the Note with respect to which the Series C
Warrant is being issued and will expire on December 31, 2003.  The proceeds from
the sale of the Units was used principally to pay the remaining principal amount
of Zero Coupon Notes which had not been converted  (approximately $2.8 million),
and to reduce the Company's debt to Foothill Capital  Corporation  ("Foothill"),
the Company's secured lender (approximately $2.95 million).  The balance of such
proceeds was added to working capital.

      In January 1998, the Company  amended its agreement  with Foothill,  as of
November 30, 1997, to extend the expiration  date of the agreement from November
30, 1998 to August 31,  1999.  In  connection  with the  amendment,  the Company
reduced  to $3.00  per share the  exercise  price of  warrants  to  purchase  an
aggregate  of 460,068  shares of Common  Stock which were held by  Foothill  and
extended the term of such warrants to November 30, 2002.

      On January 26, 1998, the Company entered into an agreement with holders of
$1.26 million principal amount of its 6% Convertible Subordinated Debentures Due
July 1, 2002 ("6%  Debentures").  Pursuant to the agreement,  the Company issued
330,372 shares of Common Stock in cancellation of the principal and interest due
on such 6% Debentures.  The Company is in default on the approximately  $385,000
principal amount of 6% Debentures which was outstanding at January 29, 1998 as a
result of the its failure to pay the interest payments due since June 30, 1994.

      As of February 2, 1998, after giving effect to the transactions  described
in this Form 8-K, there were 9,060,954 shares of Common Stock outstanding.

Item 7. Financial Statements and Exhibits.

      (c)   Exhibits

      4.1   Amendment  No. Five dated as of November  30,  1997,  to Amended and
            Restated Loan an Security  Agreement  between Foothill Capital Corp.
            ("Foothill") and the Company,  including  amendments to the warrants
            held by Foothill.

<PAGE>

      10.1  Form of subscription  agreement for Units, including the form of 12%
            Note, Series B Warrant and Series C Warrant.

      10.2  Agreement  dated  January  26,  1998,  among the  Company and Henley
            Group,  Ltd.,  Woodstead  Associates,  L.P.,  Lake  Trust  and Smith
            Management Company, Inc.


                                      - 2 -
<PAGE>

                                    SIGNATURE

      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                               PORTA SYSTEMS CORP.

                               /s/ Edward B. Kornfeld
                               --------------------------------------
Date: February 2, 1998         Edward B. Kornfeld
                               Senior Vice President and Chief Financial Officer


                                      - 3 -



                  AMENDMENT NUMBER FIVE TO AMENDED AND RESTATED
                           LOAN AND SECURITY AGREEMENT

      This  Amendment  Number Five to Amended  and  Restated  Loan and  Security
Agreement  ("Amendment")  is entered into as of November 30, 1997 by and between
FOOTHILL CAPITAL CORPORATION,  a California corporation ("Foothill"),  and PORTA
SYSTEMS CORP., a Delaware corporation ("Borrower"), in light of the following:

      FACT ONE: Borrower and Foothill have previously  entered into that certain
Amended and Restated Loan and Security Agreement, dated as of November 28, 1994,
as amended as of February  13, 1995,  March 30, 1995,  March 12, 1996 and August
26, 1997 (collectively, the "Agreement").

      FACT TWO: Borrower and Foothill desire to further amend the Loan Agreement
as provided for and on the conditions herein.

      NOW,  THEREFORE,  Borrower and Foothill hereby amend the Loan Agreement as
follows:

      1.  DEFINITIONS.  All initially  capitalized  terms used in this Amendment
shall  have the  meanings  given to them in the  Agreement  unless  specifically
defined herein.

      2. AMENDMENT.

            2.1.  Renewal and  Extension of Term of  Agreement.  The term of the
Agreement  expires on November 30, 1998.  Borrower and Foothill  desire to renew
the term of the  Agreement  and  extend the  expiration  date of the term of the
Agreement  to August 31,  1999.  The  Agreement is amended as follows to reflect
such renewal and extension:

            A. The  definition of "Renewal Date" in Section 1.1 of the Agreement
is hereby  amended by deleting such  definition in its entirety and replacing it
with the following definition:

      "'Renewal Date' means August 31, 1999."

            B. Section 3.4 of the  Agreement is hereby  amended by deleting such
Section in its entirety and replacing it with the following language:

      "3.4 Term.  This Agreement  shall become  effective upon the execution and
delivery  hereof by Borrower and  Foothill and shall  continue in full force and
effect for a term  ending on August 31,  1999.  The  foregoing  notwithstanding,
Foothill shall have the right to terminate its obligations  under this Agreement
immediately  and without notice upon the occurrence and during the  continuation
of an Event of Default."

<PAGE>

      3.  REPRESENTATIONS  AND  WARRANTIES.  Borrower hereby affirms to Foothill
that all of Borrower's representations and warranties set forth in the Agreement
are true, complete and accurate in all respects as of the date hereof.

      4. NO  DEFAULTS.  Borrower  hereby  affirms to  Foothill  that no Event of
Default has occurred and is continuing as of the date hereof.

      5. CONDITIONS PRECEDENT.  The effectiveness of this Amendment is expressly
conditioned upon each of the following:

            (a) Receipt by Foothill of an executed copy of this Amendment, and

            (b)  Borrower's  agreement,  as evidenced  by its  signature on this
      Amendment,  to modify its outstanding Warrants dated November 28, 1994 and
      March 12, 1996, respectively, as provided on Exhibit A attached hereto.


      6. COSTS AND  EXPENSES.  Borrower  shall pay to Foothill all of Foothill's
out-of-pocket costs and expenses  (including,  without limitation,  the fees and
expenses of its  counsel,  which  counsel may include any local  counsel  deemed
necessary, search fees, filing and recording fees, documentation fees, appraisal
fees,  travel  expenses,   and  other  fees)  arising  in  connection  with  the
preparation,   execution,  and  delivery  of  this  Amendment  and  all  related
documents.

      7.  LIMITED  EFFECT.  In the  event of a  conflict  between  the terms and
provisions of this Amendment and the terms and provisions of the Agreement,  the
terms and provisions of this Amendment shall govern. In all other respects,  the
Agreement,  as amended and supplemented  hereby,  shall remain in full force and
effect.

      8.  COUNTERPARTS;  EFFECTIVENESS.  This  Amendment  may be executed in any
number of counterparts and by different parties on separate  counterparts,  each
of which when so executed and delivered  shall be deemed to be an original.  All
such counterparts,  taken together, shall constitute one and the same Amendment.
This  Amendment  shall become  effective  upon the execution of a counterpart of
this Amendment by each of the parties hereto.

      IN WITNESS WHEREOF,  the parties hereto have executed this Amendment as of
the date first set forth above.

                                           FOOTHILL CAPITAL CORPORATION,
                                           a California corporation
                                          
                                           By:__________________________________
                                           Title:_______________________________
                                          

                                        2

<PAGE>

                                           PORTA SYSTEMS CORP.,
                                           a Delaware corporation

                                           By:__________________________________
                                           Title:_______________________________
                                          

                                        3

<PAGE>

      Each of the  undersigned  affiliates of Porta  Systems Corp.  ("Porta") is
aware of the terms of the above  Amendment  Number Five to Amended and  Restated
Loan  and  Security  Agreement,  dated  as  of  November  28,  1994  (the  "Loan
Agreement"), and acknowledges that all of such affiliate's obligations under any
of the  Collateral  Documents (as defined in the  Assignment  Agreement) are and
shall continue in full force and effect in favor of Foothill Capital Corporation
("Foothill"),  including the  obligations to guarantee the  obligations of Porta
owing to Foothill and to secure such  obligations  pursuant to the terms of such
Collateral Documents.  "Assignment Agreement" shall have the meaning given to it
in the Loan Agreement.

                                           ASTER CORPORATION

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           CPI HOLDING CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           CRITERION PLASTICS, INC.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           DISPLEX, INC.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                        4

<PAGE>

                                           MIROR TELEPHONY SOFTWARE, INC.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           PORTA FOREIGN SALES CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           PORTA SYSTEMS EXPORT CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           PORTA SYSTEMS INTERNATIONAL CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           PORTA SYSTEMS LEASING CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                        5

<PAGE>

                                           PORTA SYSTEMS OVERSEAS CORP.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           LERO INDUSTRIES LTD.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           PORTA SYSTEMS, LIMITED

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           VANDERHOFF BUSINESS SYSTEMS LTD.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                           VANDERHOFF COMMUNICATIONS LTD.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                        6

<PAGE>

                                           PORTA SYSTEMS S.A. de C.V.

                                           By:__________________________________
                                           Name:________________________________
                                           Title:_______________________________


                                        7

<PAGE>

                       Exhibit A to Amendment Number Five

1.    As of November 30, 1997,  Foothill holds Warrants for the adjusted  number
      of shares of Borrower's Common Stock,  $.01 par value,  exercisable at the
      following prices:

                                                                       Exercise 
                                               No. of Shares             Price
                                               -------------           --------

           November 28, 1994 Warrant           164,627                 $8.9828

           March 12, 1996 Warrant              295,441                 $3.3848

2.    Borrower and Foothill each agrees to complete the following  amendments to
      each of the Warrants on or before January 15, 1998:

            (a)   The exercise price shall be reduced to $3.00 per share,

            (b)   The maturity date shall be extended to November 30, 2002,

            (c)   Upon written notice to Foothill, Borrower shall have the right
                  to require  Foothill to exercise the Warrants at any time that
                  the  closing  price  of  Borrower's  Common  Stock is $6.00 or
                  greater on the 20 consecutive  trading days immediately  prior
                  to such notice, and

            (d)   Foothill  shall have the right to make a cashless  exercise of
                  the Warrants.

3.    Borrower agrees to file a Registration Statement for the underlying shares
      of Common Stock that are subject to the Warrants prior to March 31, 1998.

                                                    Please initial here.

                                               Foothill Capital Corporation_____

                                                        Porta Systems Corp._____


                                        8

<PAGE>

                         AMENDMENT NUMBER ONE TO WARRANT

      This  Amendment  Number  One to  Warrant  ("Amendment")  is  executed  and
delivered  as of January  __,  1998 by and  between  PORTA  SYSTEMS  CORP.  (the
"Company") and FOOTHILL CAPITAL CORPORATION ("Foothill").

                                    RECITALS

      1. Company issued a warrant to Foothill on March 12, 1996 for the right to
purchase 1,000,000 shares of Common Stock of the Company at an exercise price of
$1.00 per share (the "Warrant").

      2. As a result  of  certain  adjustments  provided  under the terms of the
Warrant,  the  Warrant  is  currently  exercisable  into  295,441  shares of the
Company's Common Stock at an adjusted exercise price of $3.3848 per share.

      3. Company and Foothill  have  entered  into  Amendment  Number Five dated
November  30,  1997 to that  certain  Amended  and  Restated  Loan and  Security
Agreement, dated as of November 28, 1994 ("Loan Amendment").

      4. As a  condition  precedent  to the  Loan  Amendment,  the  Company  and
Foothill  have agreed to amend the  Warrant  exercise  price and  certain  other
provisions as provided for herein.

      NOW, THEREFORE, Company and Foothill hereby amend the Warrant as follows:

      1. The face page and first  paragraph of the Warrant is hereby modified in
its entirety to read as follows:

            THIS  WARRANT  AND THE  SHARES  OF  COMMON  STOCK  PURCHASABLE
            HEREUNDER HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
            1933, AS AMENDED,  OR ANY APPLICABLE STATE SECURITIES LAWS AND
            MUST BE HELD INDEFINITELY UNLESS SUBSEQUENTLY REGISTERED UNDER
            SAID ACT AND ANY APPLICABLE  STATE SECURITIES LAWS OR DISPOSED
            OF   PURSUANT   TO  AN   EXEMPTION   FROM  SUCH   REGISTRATION
            REQUIREMENTS.

                                     WARRANT

                           TO PURCHASE COMMON STOCK OF

                               PORTA SYSTEMS CORP.

                          Void After November 30, 2002

<PAGE>

            PORTA SYSTEMS CORP., a Delaware corporation (the "Company"),  hereby
            certifies that, for value received the adequacy and receipt of which
            are hereby acknowledged,  FOOTHILL CAPITAL CORPORATION, a California
            corporation  ("Foothill"),  or its registered assigns (collectively,
            the  "Warrantholders"),  is  entitled,  subject  to  the  terms  and
            conditions  set forth in this Warrant (said Warrant and any warrants
            issued in exchange  herefor or transfer or  replacements  hereof are
            collectively  referred to as the  "Warrants"),  to purchase from the
            Company two hundred ninety-five  thousand four hundred and forty-one
            (295,441) fully paid and nonassessable shares of Common Stock of the
            Company, par value $.01 per share (the "Common Stock," which term is
            further  defined in Section 4(i) hereof) in whole or in part, at any
            time or from  time to time  until 5 p.m.  California  local  time on
            November 30, 2002  ("Exercise  Period") at a purchase price equal to
            $3.00 per share (the "Exercise Price"), the number of such shares of
            Common Stock and the Exercise  Price being  subject to adjustment as
            provided  herein.  The Company shall have the right to redeem any or
            all of the Warrants for $.0001 per share of Common Stock  subject to
            the  Warrants  if,  at any time on or after  November  30,  1997 the
            average  closing  price  per  share  of the  Common  Stock on any 20
            consecutive  trading  days  ending no more than 10 days prior to the
            date of the  notice  of  redemption,  has been at least  200% of the
            Exercise  Price in effect on such  date.  Notice of at least 30 days
            prior to the date  scheduled for such  redemption  (the "Call Date")
            shall be given to  Warrantholders  in accordance with the provisions
            of Section 13(b). Warrantholders shall continue to have the right to
            exercise  the  Warrants  until  the close of  business  on the fifth
            business day immediately preceding the Call Date.

      2. The following is added after the last sentence of Paragraph 1:

            In lieu of exercising this Warrant by payment of the Exercise Price,
            the  Warrantholder  shall have the right to exchange or convert this
            Warrant,  in whole or in part,  to the extent that this  Warrant has
            not  been  exercised  for the  number  of  shares  of  Common  Stock
            determined by (A)  multiplying  (x) the number of shares as to which
            this Warrant is being  exercised by (y) the  difference  between the
            current  value per share of Common Stock on the date of exercise and
            the  Exercise  Price per share,  as in effect on such date,  and (B)
            dividing  the result so obtained  by the current  value per share of
            Common  Stock on the date of  exercise.  The date of exercise  shall
            mean,  for  purposes  of this  Paragraph  1, the date on which  this
            Warrant  accompanied  by the notice of  exercise  is received by the
            Company.  The  current  value  per share of  Common  Stock  shall be
            determined as follows:

                  (i) If the  Common  Stock is listed on a  national  securities
            exchange or admitted to unlisted trading privileges on such exchange
            or listed for trading on the Nasdaq Stock Market ("Nasdaq") or other
            automated quotation system which provides information as to the last
            sale price,  the current  value shall be the average of the reported
            last sale  prices of one share of Common  Stock on such  exchange or
            system  on the  last  five  (5)  trading  days  prior to the date of
            exercise of this Warrant,


                                        2

<PAGE>

            or if, on any of such dates,  no such sale is made on such day,  the
            average of the  closing  bid and asked  prices for such date on such
            exchange or system shall be used; or

                  (ii) If the  Common  Stock is not so  listed  or  admitted  to
            unlisted trading privileges,  the current value shall be the average
            of the  reported  last bid and  asked  prices of one share of Common
            Stock as reported by Nasdaq, the National Quotation Bureau,  Inc. or
            other similar reporting services,  on the last five (5) trading days
            prior to the date of the exercise of this Warrant; or

                  (iii) If the  Common  Stock is not so  listed or  admitted  to
            unlisted  trading  privileges  and bid and asked  prices  are not so
            reported, the current value of one share of Common Stock shall be an
            amount,  not less than book  value,  determined  in such  reasonable
            manner  as may  be  prescribed  by the  Board  of  Directors  of the
            Company.

      3. The  definition  of  "Additional  Shares of Common  Stock" set forth in
Paragraph 4 of the  Warrant  shall be amended by  changing  "March 12,  1996" to
"December 31, 1997."

      4.  Subparagraph  (b) of Section 10 is  deleted  in its  entirety  and the
following shall be inserted to read as follows:

                  (b) Required Registration.  The Company shall promptly prepare
            and file a registration  statement under the Securities Act covering
            the Registrable Stock no later than March 31, 1998.

      5. Subparagraph (i) of Paragraph 10(d) is restated in its entirety to read
as follows:

                  (i) In accordance  with the  Securities  Act and the rules and
            regulations of the Commission,  prepare and file with the Commission
            a  registration  statement  on the  form of  registration  statement
            appropriate  with respect to such  securities and use its reasonable
            best  efforts to cause  such  registration  statement  to become and
            remain  effective  for such period as necessary  for the  securities
            covered by such  registration  statement to be sold, and prepare and
            file  with  the  Commission  such  amendments  to such  registration
            statement and supplements to the prospectus contained therein as may
            be necessary to keep such registration  statement effective and such
            registration statement and prospectus accurate and complete;

      6.  Notwithstanding  any  provision  to  the  contrary,  for  purposes  of
Paragraph 4 of the  Warrant,  adjustments,  if any,  shall be  calculated  after
December 31, 1997. The Company  represents that since December 11, 1997 no event
has occurred which would require any  adjustment  pursuant to Paragraph 4 of the
Warrant based upon the amended Exercise Price set forth in this Amendment.

      7. Except as modified herein, the Warrant remains in full force and effect
and has not been amended or modified.


                                        3

<PAGE>

      Company and Foothill have executed and delivered  this Amendment as of the
date set forth in the first paragraph hereof.

                                           PORTA SYSTEMS CORP.,
                                           a Delaware corporation

                                           By:__________________________________
                                           Title:_______________________________


                                           FOOTHILL CAPITAL CORPORATION
                                           a California corporation

                                           By:__________________________________
                                           Title:_______________________________


                                        4

<PAGE>

                        AMENDMENT NUMBER THREE TO WARRANT

      This  Amendment  Number  Three to Warrant  ("Amendment")  is executed  and
delivered  as of January  __,  1998 by and  between  PORTA  SYSTEMS  CORP.  (the
"Company") and FOOTHILL CAPITAL CORPORATION ("Foothill").

                                    RECITALS

      1. Company  issued a warrant to Foothill on November 28, 1994,  (which was
subsequently  amended on February  13, 1995 and March 12, 1996) for the right to
purchase  412,500  shares of Common Stock of the Company at an exercise price of
$5.78 per share (the "Warrant").

      2. As a result  of  certain  adjustments  provided  under the terms of the
Warrant,  the  Warrant  is  currently  exercisable  into  164,627  shares of the
Company's Common Stock at an adjusted exercise price of $8.9828 per share.

      3. Company and Foothill  have  entered  into  Amendment  Number Five dated
November  30,  1997 to that  certain  Amended  and  Restated  Loan and  Security
Agreement, dated as of November 28, 1994 ("Loan Amendment").

      4. As a  condition  precedent  to the  Loan  Amendment,  the  Company  and
Foothill  have agreed to amend the  Warrant  exercise  price and  certain  other
provisions as provided for herein.

      NOW, THEREFORE, Company and Foothill hereby amend the Warrant as follows:

      1. The face page and first  paragraph of the Warrant is hereby modified in
its entirety to read as follows:

          THIS  WARRANT  AND THE  SHARES  OF  COMMON  STOCK  PURCHASABLE
          HEREUNDER HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933, AS AMENDED,  OR ANY APPLICABLE STATE SECURITIES LAWS AND
          MUST BE HELD INDEFINITELY UNLESS SUBSEQUENTLY REGISTERED UNDER
          SAID ACT AND ANY APPLICABLE  STATE SECURITIES LAWS OR DISPOSED
          OF   PURSUANT   TO  AN   EXEMPTION   FROM  SUCH   REGISTRATION
          REQUIREMENTS.

                                     WARRANT

                           TO PURCHASE COMMON STOCK OF

                               PORTA SYSTEMS CORP.

                          Void After November 30, 2002

<PAGE>

            PORTA SYSTEMS CORP., a Delaware corporation (the "Company"),  hereby
            certifies that, for value received the adequacy and receipt of which
            are hereby acknowledged,  FOOTHILL CAPITAL CORPORATION, a California
            corporation  ("Foothill"),  or its registered assigns (collectively,
            the  "Warrantholders"),  is  entitled,  subject  to  the  terms  and
            conditions  set forth in this Warrant (said Warrant and any warrants
            issued in exchange  herefor or transfer or  replacements  hereof are
            collectively  referred to as the  "Warrants"),  to purchase from the
            Company one hundred  sixty-four  thousand  six hundred  twenty-seven
            (164,627) fully paid and nonassessable shares of Common Stock of the
            Company, par value $.01 per share (the "Common Stock," which term is
            further  defined in Paragraph  4(i) hereof) in whole or in part,  at
            any time or from time to time until 5 p.m.  California local time on
            November 30, 2002  ("Exercise  Period") at a purchase price equal to
            $3.00 per share (the "Exercise Price"), the number of such shares of
            Common Stock and the Exercise  Price being  subject to adjustment as
            provided  herein.  The Company shall have the right to redeem any or
            all of the Warrants for $.0001 per share of Common Stock  subject to
            the  Warrants  if,  at any time on or after  November  30,  1997 the
            average  closing  price  per  share  of the  Common  Stock on any 20
            consecutive  trading  days  ending no more than 10 days prior to the
            date of the  notice  of  redemption,  has been at least  200% of the
            Exercise  Price in effect on such  date.  Notice of at least 30 days
            prior to the date  scheduled for such  redemption  (the "Call Date")
            shall be given to  Warrantholders  in accordance with the provisions
            of Section 13.  Warrantholders  shall  continue to have the right to
            exercise  the  Warrants  until  the close of  business  on the fifth
            business day immediately preceding the Call Date.

      2. The phrase in  Paragraph 1 which reads "(or in the case of the Warrants
for the additional  135,500 shares if the Company  exercises its right to extend
the Renewal Date,  during the portion of the Exercise Period commencing with the
Renewal Date)" is hereby deleted in its entirety.

      3. The following is added after the last sentence of Paragraph 1:

            In lieu of exercising this Warrant by payment of the Exercise Price,
            the  Warrantholder  shall have the right to exchange or convert this
            Warrant,  in whole or in part,  to the extent that this  Warrant has
            not  been  exercised  for the  number  of  shares  of  Common  Stock
            determined by (A)  multiplying  (x) the number of shares as to which
            this Warrant is being  exercised by (y) the  difference  between the
            current  value per share of Common Stock on the date of exercise and
            the  Exercise  Price per share,  as in effect on such date,  and (B)
            dividing  the result so obtained  by the current  value per share of
            Common  Stock on the date of  exercise.  The date of exercise  shall
            mean,  for  purposes  of this  Paragraph  1, the date on which  this
            Warrant  accompanied  by the notice of  exercise  is received by the
            Company.  The  current  value  per share of  Common  Stock  shall be
            determined as follows:

                  (i) If the  Common  Stock is listed on a  national  securities
            exchange or admitted to unlisted trading privileges on such exchange
            or listed for trading on the


                                        2
<PAGE>

            Nasdaq Stock Market  ("Nasdaq") or other automated  quotation system
            which provides  information  as to the last sale price,  the current
            value shall be the average of the  reported  last sale prices of one
            share of Common  Stock on such  exchange  or system on the last five
            (5) trading days prior to the date of exercise of this  Warrant,  or
            if, on any of such  dates,  no such  sale is made on such  day,  the
            average of the  closing  bid and asked  prices for such date on such
            exchange or system shall be used; or

                  (ii) If the  Common  Stock is not so  listed  or  admitted  to
            unlisted trading privileges,  the current value shall be the average
            of the  reported  last bid and  asked  prices of one share of Common
            Stock as reported by Nasdaq, the National Quotation Bureau,  Inc. or
            other similar reporting services,  on the last five (5) trading days
            prior to the date of the exercise of this Warrant; or

                  (iii) If the  Common  Stock is not so  listed or  admitted  to
            unlisted  trading  privileges  and bid and asked  prices  are not so
            reported, the current value of one share of Common Stock shall be an
            amount,  not less than book  value,  determined  in such  reasonable
            manner  as may  be  prescribed  by the  Board  of  Directors  of the
            Company.

      4. The  definition  of  "Additional  Shares of Common  Stock" set forth in
Paragraph 4 of the Warrant  shall be amended by changing  "November 28, 1994" to
"December 31, 1997."

      5.  Subparagraph  (b) of  Paragraph  10 is deleted in its entirety and the
following shall be inserted to read as follows:

                  (b) Required Registration.  The Company shall promptly prepare
            and file a registration  statement under the Securities Act covering
            the Registrable Stock no later than March 31, 1998.

      6. Subparagraph (i) of Paragraph 10(d) is restated in its entirety to read
as follows:

                  (i) In accordance  with the  Securities  Act and the rules and
            regulations of the Commission,  prepare and file with the Commission
            a  registration  statement  on the  form of  registration  statement
            appropriate  with respect to such  securities and use its reasonable
            best  efforts to cause  such  registration  statement  to become and
            remain  effective  for such period as necessary  for the  securities
            covered by such  registration  statement to be sold, and prepare and
            file  with  the  Commission  such  amendments  to such  registration
            statement and supplements to the prospectus contained therein as may
            be necessary to keep such registration  statement effective and such
            registration statement and prospectus accurate and complete;

      7.  Notwithstanding  any  provision  to  the  contrary,  for  purposes  of
Paragraph 4 of the  Warrant,  adjustments,  if any,  shall be  calculated  after
December 31, 1997. The Company represents


                                        3

<PAGE>

that since  December  11, 1997 no event has  occurred  which  would  require any
adjustment  pursuant  to  Paragraph  4 of the  Warrant  based  upon the  amended
Exercise Price set forth in this Amendment.

      8. Except as modified herein, the Warrant remains in full force and effect
and has not been amended or modified.

      Company and Foothill have executed and delivered  this Amendment as of the
date set forth in the first paragraph hereof.

                                           PORTA SYSTEMS CORP.,
                                           a Delaware corporation


                                           By:__________________________________
                                           Title:_______________________________


                                           FOOTHILL CAPITAL CORPORATION
                                           a California corporation

                                           By:__________________________________
                                           Title:_______________________________


                                        4



Date:            , 1998

Porta Systems Corp.
575 Underhill Boulevard
Syosset, New York 11791

Attention of  Mr. William V. Carney
              Chairman of the Board and Chief Executive Officer

                                               Subscription Agreement

Dear Sirs:

Pursuant to a private  offering by Porta Systems Corp.,  a Delaware  corporation
(the "Company"),  the undersigned (the  "Subscriber")  hereby tenders his or her
subscription for the Company's units (the "Units"),  each Unit consisting of (a)
the  Company's  12%  Subordinated  Note  due  January  3,  2000  (a  "Note"  and
collectively,  the  "Notes"),  in the  principal  amount of $100,000,  and (b) a
Series B Common  Stock  Purchase  Warrant (a  "Warrant"  and  collectively,  the
"Warrants") to purchase ten thousand (10,000) shares of Common Stock. Fractional
Units may be purchased.

The purchase price of the Units is one hundred thousand  dollars  ($100,000) per
Unit.  The  Company  is  offering  the Units to a limited  number of  accredited
investors, as defined in Rule 501 of the Securities and Exchange Commission (the
"Commission")  under the  Securities  Act of 1933,  as amended (the  "Securities
Act"),  pursuant to a private  offering  pursuant to Rule 506 of the  Commission
under the Securities Act.

In  addition  to the  Warrants,  the  Company  may issue  Series C Common  Stock
Purchase Warrants (the "Additional Warrants") to the holders of the Notes on the
terms and subject to the conditions set forth in Paragraph 3 of this Agreement.

In consideration  of the mutual  covenants and agreements set forth herein,  the
Company and the Subscriber hereby agree as follows:

      1. (a) The Subscriber hereby agrees to purchase from the Company,  and the
Company agrees to sell to the  Subscriber,  the number of Units set forth on the
signature page of this  Agreement,  at a purchase price of one hundred  thousand
dollars  ($100,000)  per  Unit.  The  aggregate  purchase  price  of  the  Units
subscribed  for by the  Subscriber  is set forth on the  signature  page of this
Agreement.  Payment  of the  purchase  price  shall be made by check  payable to
"Arnhold & S. Bleichroeder, Inc., as escrow agent for Porta Systems Corp." or by
wire transfer in accordance with the Subscription Instructions.

            (b) The Company is offering an  aggregate  of thirty (30) Units on a
"best  efforts,  all or none"  basis.  If all thirty  (30)  Units are sold,  the
Company may, in its discretion,  sell up to an additional thirty (30) Units. All
proceeds  from the sale of the initial  thirty (30) Units will be held in escrow
until  there  shall be  cleared  funds in the escrow  account  of three  million
dollars

<PAGE>

($3,000,000),  at which time the  proceeds  from the sale of the Units  shall be
paid to the Company. If there is not at least three million dollars ($3,000,000)
in cleared funds by the last day of the Subscription  Period,  the funds will be
returned to the Subscriber without interest or deduction.  The date on which the
proceeds from the sale of the Units  purchased by the Subscriber are paid to the
Company is referred to as the "Closing  Date," and the date on which the initial
purchase  of at least  thirty  (30) Units is  consummated  is referred to as the
"Initial  Closing  Date." If Units are sold in addition to the first thirty (30)
Units,  the  payment  for such Units  shall be made  directly to the Company and
shall not be deposited into escrow.

            (c) The  Subscription  Period is the period  ending on December  31,
1997,  which may be extended by the  Company on one or more  occasions,  but not
subsequent to March 31, 1998.

            (d) The Company has engaged Arnhold and S.  Bleichroeder,  Inc. (the
"Placement  Agent")  to serve as  placement  agent for the sale of the Units for
which it will receive compensation pursuant to an agreement with the Company.

      2. The Company represents and warrants to the Subscriber as follows:

            (a) Organization and Qualification.  Each of the Company and each of
its  subsidiaries  is (i) a  corporation  duly  organized  and  existing in good
standing under the laws of the  jurisdiction in which it is incorporated and has
the requisite corporate power to own its properties and to carry on its business
as now being  conducted  and (ii)  qualified  to conduct  business  as a foreign
corporation to do business and in good standing in every  jurisdiction  in which
the nature of the business  conducted by it makes such  qualification  necessary
and where the failure so to qualify  would have a Material  Adverse  Effect.  As
used in this  Agreement,  the term "Material  Adverse Effect" means any material
adverse effect on (A) the Units,  the Notes, the Warrants and the Warrant Shares
(collectively,  the "Securities"); (B) the ability of the Company to perform its
obligations  under this  Agreement or under the  Securities or (C) the business,
operations,   properties   or  financial   condition  of  the  Company  and  its
subsidiaries, taken as a whole.

            (b)  Authorization;  Enforcement.  The  Company  has  the  requisite
corporate  power and authority to enter into and perform its  obligations  under
this Agreement,  to issue and sell the Securities pursuant to this Agreement and
the Securities  and to issue the Warrant Shares in accordance  with the terms of
the Warrants. The execution,  delivery and performance of this Agreement and the
consummation by the Company of the  transactions  contemplated by this Agreement
(including  without  limitation  the  issuance of the Units and the issuance and
reservation for issuance of the Warrant Shares) have been duly authorized by the
Company's  board of directors  and no further  consent or  authorization  of the
Company, its board of directors, or its stockholders is required. This Agreement
has been duly executed and delivered by the Company;  and  constitutes the valid
and  binding  obligation  of the  Company  enforceable  against  the  Company in
accordance with its terms.

            (c)  Capitalization.  The  authorized  capital  stock of the Company
consists  of  1,000,000  shares  of  preferred  stock,  with no par  value,  and
20,000,000 shares of Common Stock. As of December 19, 1997,  8,476,889 shares of
Common Stock were issued. Additional shares


                                      - 2 -

<PAGE>

of Common Stock are reserved for issuance (i) as set forth in the SEC Documents,
as  hereinafter  defined;  (ii)  upon  conversion  of  the  Zero  Coupon  Senior
Subordinated Convertible Notes due January 2, 1998 ("Zero Notes") at the reduced
conversion  price of $3.65 per share, to the extent that such Zero Notes had not
been  converted  at such date and (iii)  upon  exercise  of  warrants  issued to
Arnhold and S. Bleichroeder, Inc. for services relating to the conversion of the
Zero  Notes,  and that  other  warrants  or  options  may be issued or  existing
warrants  or options may be amended.  All of the  outstanding  shares of capital
stock  have been,  or upon  issuance  will be,  validly  issued,  fully paid and
nonassessable.  No shares of capital stock of the Company (including the Warrant
Shares)  are subject to  preemptive  rights or any other  similar  rights of the
stockholders of the Company or any liens or encumbrances.

            (d) Issuance of Shares.  The Warrant Shares are duly  authorized and
reserved for  issuance.  Upon  exercise of the Warrants in  accordance  with the
terms  thereof,  the  Warrant  Shares  will be  validly  issued,  fully paid and
non-assessable,  and free from all taxes,  liens, claims and encumbrances (other
than those  incurred  by the person  exercising  the  Warrants)  and will not be
subject to preemptive  rights or other  similar  rights of  stockholders  of the
Company and will not impose personal liability upon the holder thereof.

            (e) No Conflicts.  The execution,  delivery and  performance of this
Agreement  by the Company,  the  performance  by the Company of its  obligations
under this Agreement and the Securities,  and the consummation by the Company of
the transactions contemplated by this Agreement (including,  without limitation,
the  reservation  for  issuance  of the Warrant  Shares and the  issuance of the
Warrant Shares upon exercise of the Warrants) will not (i) result in a violation
of the  Company's  certificate  of  incorporation  and by-laws,  as currently in
effect (the  "Organizational  Documents") or (ii) conflict with, or constitute a
default (or an event  which with notice or lapse of time or both would  become a
default)  under,  or  give to  others  any  rights  of  termination,  amendment,
acceleration or cancellation of, any agreement, indenture or instrument to which
the Company or any of its subsidiaries is a party or by which they are bound, or
result in a violation of any law, rule,  regulation,  order,  judgment or decree
(including,   based  on  the  accuracy  the  Subscriber's   representations  and
warranties set forth in this  Agreement,  Federal and state  securities laws and
regulations)  applicable to the Company or any of its  subsidiaries  or by which
any  property  or asset of the  Company or any of its  subsidiaries  is bound or
affected  (except,  with respect to clause (ii), for such  conflicts,  defaults,
terminations,  amendments, accelerations,  cancellations and violations as would
not,  individually or in the aggregate,  have a Material  Adverse  Effect).  The
Company is not in violation  of its  Organizational  Documents,  and neither the
Company nor any of its  subsidiaries  is in default  (and no event has  occurred
which, with notice or lapse of time or both, would put the Company or any of its
subsidiaries in default)  under,  nor has there occurred any event giving others
(with  notice or lapse of time or both) any  rights of  termination,  amendment,
acceleration or cancellation of, any Contract,  as hereinafter defined, to which
the Company or such subsidiary is a party or by which they are bound, except for
possible defaults or rights as would not, individually or in the aggregate, have
a Material  Adverse  Effect.  The business of the Company and its  subsidiaries,
taken as a whole, is not being  conducted in violation of any law,  ordinance or
regulation  of any  governmental  entity,  except for  possible  violations  the
sanctions  which  either  singly or in the  aggregate  would not have a Material
Adverse  Effect.  The Company is not required to obtain any  consent,  approval,
authorization or order of, or make any filing or registration with, any court or
governmental agency or any regulatory or self


                                      - 3 -


<PAGE>

regulatory  agency or other party (each of the foregoing  being referred to as a
"consent") in order for it to execute, deliver or perform any of its obligations
under this  Agreement or the  Securities,  in each case in  accordance  with the
terms hereof or thereof other than filings  required  pursuant to the Securities
Act and applicable  state  securities laws and the listing of the Warrant Shares
on the  American  Stock  Exchange  ("Exchange")  and except where the failure to
obtain any such consent would not have a Material  Adverse  Effect.  The Company
does not presently meet the requirements for the continued listing of its Common
Stock on the Exchange; however, since at or about mid-November, when the Company
has advised the Exchange of the amended conversion terms for the Zero Notes, the
Company  has  received no notice from the  Exchange  of any  intention,  and the
Company has no reason to believe that the  Exchange  will take any action in the
near future, to delist the Common Stock from the Exchange.

            (f) SEC Documents,  Financial Statements. Except as set forth in the
SEC Documents, (i) the Company has timely filed all reports,  schedules,  forms,
statements  and other  documents  required to be filed by it with the Commission
pursuant to the reporting  requirements of the Securities  Exchange Act of 1934,
as amended  (the  "Exchange  Act")  subsequent  to December 31, 1995 (all of the
foregoing,  including  all material  incorporated  by reference  therein,  being
hereinafter  referred  to  herein  as the  "SEC  Documents"),  (ii) as of  their
respective  dates, the SEC Documents  complied in all material respects with the
requirements  of the Exchange Act or the Securities Act, as the case may be, and
the rules and regulations of the Commission promulgated thereunder applicable to
the SEC Documents,  (iii) none of the SEC Documents, at the time they were filed
with the  Commission,  contained  any untrue  statement  of a  material  fact or
omitted to state a material fact  required to be stated  therein or necessary in
order to make the statements  therein, in light of the circumstances under which
they were made, not misleading, (iv) as of their respective dates, the financial
statements of the Company  included in the SEC Documents  complied as to form in
all material respects with applicable accounting  requirements and the published
rules and  regulations  of the  Commission  with respect  thereto,  and (v) such
financial  statements have been prepared in accordance  with generally  accepted
accounting principles, consistently applied, during the periods involved (except
(A) as may be otherwise  indicated  in such  financial  statements  or the notes
thereto, or (B) in the case of unaudited interim statements,  to the extent they
may not include footnotes or may be condensed or summary  statements) and fairly
present in all material  respects  the  consolidated  financial  position of the
Company  and its  consolidated  subsidiaries  as of the dates of the  respective
balance sheets and the  consolidated  results of their operations and cash flows
for the periods then ended  (subject,  in the case of unaudited  statements,  to
year-end audit  adjustments).  The Company has made available to the Subscribers
true and complete  copies of the SEC Documents.  None of the statements  made in
any such SEC Documents is, or has been,  required to be updated or amended under
applicable  law except to the  extent  updated  or  amended  in  subsequent  SEC
Documents.  Except as set forth in the most recent  financial  statements of the
Company included in the SEC Documents,  the Company has no material liabilities,
contingent or  otherwise,  other than (x)  liabilities  incurred in the ordinary
course of business  subsequent to the date of such financial  statements and (y)
obligations  under contracts and commitments  incurred in the ordinary course of
business and not required under generally accepted  accounting  principles to be
reflected in such financial statements. Neither the Company nor its subsidiaries
is in  breach  or  violation  of any  contracts,  agreements,  leases  or  other
instruments  (each a  "Contract")  to which the Company or any  subsidiary  is a
party or by which the Company or any subsidiary is bound or


                                      - 4 -

<PAGE>

to which any of the  properties  or assets of the Company or any  subsidiary  is
subject, which breach or violation would have a Material Adverse Effect.

            (g) Absence of Certain Changes.  Since September 30, 1997, there has
been  no  material  adverse  change  in the  business,  properties,  operations,
financial condition,  or results of operations of the Company, or to the best of
the  Company's  knowledge,  its  prospects,  except  as  disclosed  in  the  SEC
Documents.

            (h) Absence of Litigation. Except as disclosed in the SEC Documents,
there is no action, suit, proceeding,  inquiry or investigation before or by any
court,  public board,  government agency,  self-regulatory  organization or body
pending  or,  to the  knowledge  of  the  Company  or  any of its  subsidiaries,
threatened against or affecting the Company, any of its subsidiaries,  or any of
their  respective  directors or officers in their  capacities as such wherein an
unfavorable decision, ruling or finding would have a Material Adverse Effect.

            (i) Intellectual Property.  Each of the Company and its subsidiaries
owns  or is  licensed  to use  all  patents,  patent  applications,  trademarks,
trademark  applications,  trade  names,  service  marks,  copyrights,  copyright
applications,  licenses,  permits,  know-how  (including trade secrets and other
unpatented and/or unpatentable proprietary or confidential information,  systems
or procedures) and other similar rights and proprietary knowledge (collectively,
"Intangibles")  necessary for the conduct of its business as now being conducted
and as described in the Company's Annual Report on Form 10-K for the fiscal year
ended  December 31,  1996.  To the best  knowledge  of the Company,  neither the
Company nor any  subsidiary of the Company  infringes or is in conflict with any
right of any other person with respect to any Intangibles which, individually or
in the aggregate, if the subject of an unfavorable decision,  ruling or finding,
would have a Material Adverse Effect.

            (j) Foreign Corrupt Practices.  Neither the Company,  nor any of its
subsidiaries,  nor any director, officer, agent, employee or other person acting
on behalf of the  Company or any  subsidiary  has,  in the course of his actions
for, or on behalf of, the  Company,  used any  corporate  funds for any unlawful
contribution,  gift,  entertainment  or  other  unlawful  expenses  relating  to
political activity;  made any direct or indirect unlawful payment to any foreign
or domestic government official or employee from corporate funds; violated or is
in violation of any provision of the U.S. Foreign Corrupt Practices Act of 1977;
or made any bribe, rebate, payoff, influence payment, kickback or other unlawful
payment to any foreign or domestic government official or employee.

            (k)  Disclosure.  All  information  relating  to or  concerning  the
Company set forth in this Agreement or included in the Disclosure Documents,  as
hereinafter  defined,  taken  together,  is true  and  correct  in all  material
respects,  and the Company has not omitted to state any material fact  necessary
in  order  to make  the  statements  made  herein  or  therein,  in light of the
circumstances under which they were made, not misleading.

            (l) Form S-3 Eligibility.  As of date of this Agreement, the Company
was  eligible  to  register  the  resale of its Common  Stock on a  registration
statement on Form S-3 under the Securities Act.


                                      - 5 -

<PAGE>

            (m) No  Integrated  Offering.  Neither  the  Company  nor any of its
affiliates,  nor any  person  acting on its or their  behalf,  has  directly  or
indirectly  made any offers or sales of any securities or solicited any offerers
to buy any security under  circumstances that would require  registration of the
Units being offered hereby under the Securities Act.

            (n) No Brokers.  The  Company  has taken no action  which would give
rise to any claim by any  person for  brokerage  commissions,  finder's  fees or
similar payments by any Purchaser relating to this Agreement or the transactions
contemplated  hereby,  except  for  dealings  with the  Placement  Agent,  whose
commissions and fees will be paid for by the Company.

      3. To the extent  that any Note is  outstanding  one year from the date on
which such Note is issued  (the  "Anniversary  Date of the  Note"),  the Company
shall  issue to the holder of such Note on the  Anniversary  Date of the Note an
Additional  Warrant  to  purchase  25  shares of  Common  Stock for each  $1,000
principal  amount of Notes  outstanding on the Anniversary Date of the Note. The
Additional  Warrant  will have an  exercise  price  equal to the  average of the
closing  prices of the Common Stock on each of the five  trading days  preceding
the Anniversary Date of the Note with respect to which the Additional Warrant is
being issued.

      4. The Subscriber understands and agrees that, after the Company's receipt
of this Agreement, the Company will review the Subscriber's eligibility and will
determine whether to accept or reject this subscription in whole or in part. The
Company may  determine  to reject this  subscription  in whole or in part in its
sole and  absolute  discretion.  In making such  determination,  the Company may
request,  and the Subscriber agrees to provide,  additional  financial and other
information  about the  Subscriber.  If this  subscription is accepted in whole,
then the Company will issue the Units subscribed for to the Subscriber.  If this
subscription  is rejected in whole,  this  Agreement and any other  subscription
materials  will be promptly  returned  to the  Subscriber  and the  Subscriber's
subscription  payment will be refunded to the Subscriber  without  interest.  In
that event, the Subscriber and the Company will have no further rights or claims
against each other by virtue of this Agreement. If this subscription is accepted
in part and rejected in part,  the Company is authorized to amend this Agreement
to reflect the number of Units for which this subscription is accepted,  and the
Company will issue the Notes and Warrants  comprising the Units as to which this
subscription  is  accepted  at the same  time as if this  subscription  had been
accepted in whole.

      5. The  Subscriber  hereby  represents  and warrants to, and covenants and
agrees with, the Company as follows:

            (a) The Subscriber  understands that the offer and sale of the Units
is being made only by means of this  Agreement.  In  deciding to  subscribe  for
Units,  the  Subscriber  has not  considered  any  information  other  than that
contained in this  Agreement  and in the  documents  listed in Exhibit A to this
Agreement (the  "Disclosure  Documents"),  a copy of each of which has been made
available to the  Subscriber  and reviewed by the  Subscriber to the extent that
the Subscriber  deemed  necessary or advisable.  In  particular,  the Subscriber
understands  that the Company has not  authorized the use of, and the Subscriber
confirms that he or she is not relying upon, any other  information,  written or
oral,  other  than  material  contained  in this  Agreement  and the  Disclosure
Documents. The Subscriber is aware that the purchase of the Units involves a


                                      - 6 -

<PAGE>

high degree of risk and that the Subscriber  may sustain,  and has the financial
ability to sustain,  the loss of his or her entire  investment.  The  Subscriber
understands that the Company has in the past incurred  significant losses and no
assurance can be given that the Company will be  profitable in the future,  that
the Company does not meet the American  Stock  Exchange's  requirements  for the
continued  listing of the Common Stock on such  exchange and no assurance can be
given that there will  continue  to be a market for the Common  Stock,  that the
failure of the Company to raise funds, in addition to the proceeds from the sale
of the Units,  may have a material  adverse  effect  upon its  business  and, if
sufficient  additional funds are not raised,  the Company may not be able to pay
the Notes when due. The  Subscriber  understands  that the net proceeds from the
sale of the Units is to be used to pay the  principal  amount of any Zero  Notes
which have not been converted into Common Stock, that if such notes are not paid
when due,  the  Company  will be in default  with  respect to such notes and the
Company  does not have any sources  from which to pay such notes other than from
the proceeds from the sale of the Units.  Furthermore,  in  subscribing  for the
Units,  the  Subscriber  acknowledges  that the  Company  has not made,  and the
Subscriber is not relying in any manner upon,  any  projections  or forecasts of
future  operations,  except to the extent that any  projections or forecasts are
included in the SEC Documents.  The  Subscriber  has had the  opportunity to ask
questions of, and receive answers from, the Company's  management  regarding the
Company.

            (b) The  Subscriber  represents to the Company that he or she (i) is
an accredited  investor within the meaning of Rule 501 under the Securities Act,
(ii)  understands  that in order to be treated as an  accredited  investor,  the
Subscriber  must meet one of the tests for an  accredited  investor set forth on
Exhibit B to this  Agreement,  and (iii) has read Exhibit B and is an accredited
investor as set forth on the signature  page of this  Agreement.  The Subscriber
further represents that he or she has such knowledge and experience in financial
and business matters as to enable him or her to understand the nature and extent
of the risks  involved in purchasing  the Units.  The  Subscriber is fully aware
that such  investments  can and  sometimes  do result in the loss of the  entire
investment.  The  Subscriber can afford to sustain the loss of his or her entire
investment,  and the Subscriber's purchase of the Units is being made from funds
which the Subscriber has allocated to high risk,  illiquid  investments and such
funds are not required by the Subscriber to meet his or her normal expenses. The
Subscriber has engaged his or her own counsel and accountants to the extent that
he deems it necessary.

            (c)  All of  the  information  provided  by  the  Subscriber  in his
Confidential Investor Questionnaire (the  "Questionnaire"),  is true and correct
in all  material  respects.  The  Subscriber  acknowledges  that the  Company is
relying on such  statements and the  Subscriber's  representations  contained in
this Agreement in executing this Agreement and issuing the Units and its counsel
is relying on such  statements  and  representations  in  rendering  its opinion
pursuant to  Paragraph  6(a) of this  Agreement,  and the  Subscriber  agrees to
indemnify  and  hold  harmless  the  Company,   and  its  officers,   directors,
controlling persons and counsel from and against all manner of loss,  liability,
damage  or  expense  which  they or any of them may  incur  as a  result  of any
material  misstatement  of fact or omission of a material  fact set forth in the
Subscriber's  Questionnaire  or as a  result  of  any  misrepresentation  by the
Subscriber  in this  Agreement.  The  Subscriber  further  agrees to notify  the
Company immediately upon the


                                      - 7 -

<PAGE>

occurrence  of  any  event  which  makes  the   information   contained  in  the
Subscriber's Questionnaire inaccurate or misleading in any material respect.

            (d) The Subscriber is acquiring the Units pursuant to this Agreement
for investment and not with a view to the sale or distribution  thereof, for his
or her own account and not on behalf of others; has not granted any other person
any  interest  or  participation  in or right or option to  purchase  all or any
portion of the Units; is aware that the Units are restricted  securities  within
the meaning of Rule 144 of the Commission  under the Securities Act, and may not
be  sold  or  otherwise   transferred   other  than  pursuant  to  an  effective
registration  statement or an exemption from  registration;  and understands and
agrees that the Units may bear the Company's  standard  investment  legend.  The
Subscriber understands the meaning of these restrictions.

            (e) The  Subscriber  will not transfer  the Units or the  securities
comprising or underlying  the Units,  except in compliance  with all  applicable
Federal and state  securities laws and regulations.  The Subscriber  understands
and agrees that the Company is not  obligated to  recognize  any transfer of the
Units  unless  it is  satisfied  in its  sole  discretion  that  there  has been
compliance with such securities laws and  regulations,  and, in such connection,
the Company may  request an opinion of counsel  acceptable  to the Company as to
the availability of any exemption.

            (f) The  Subscriber  has  been  informed  by the  Company  that  the
issuance of the Units  pursuant to this  Agreement  will be exempt under Section
4(2) or 4(6) of the Securities Act and/or Regulation D, and in particular,  Rule
506, of the Commission  under the Securities Act and applicable  exemption under
state  securities  laws, and the Subscriber  understands  that such exemption is
dependent  upon the accuracy of the  information  contained in the  Subscriber's
Questionnaire and the Subscriber's representations set forth in this Agreement.

            (g) The Subscriber represents and warrants that, except as set forth
in such Subscriber's Questionnaire, no broker or finder was involved directly or
indirectly in connection with the Subscriber's purchase of the Units pursuant to
this Agreement  except to the extent that the Placement Agent was involved.  The
Subscriber  shall  indemnify  and hold harmless the Company from and against any
manner of loss,  liability,  damage or expense,  including  fees and expenses of
counsel,  resulting from a breach of the Subscriber's warranty contained in this
Paragraph 5(g).

            (h) To the extent that the Subscriber  has deemed it necessary,  the
Subscriber has consulted his or her own legal,  accounting,  tax, investment and
other advisors.

            (i)  If  the  Subscriber  is a  corporation,  all  corporate  action
necessary for the execution, delivery and performance by the Subscriber has been
taken and the person  executing this Agreement on behalf of the Subscriber is an
authorized officer of the Subscriber. If the Subscriber is a limited partnership
or limited liability  company,  the person executing this Agreement is a general
partner or managing  member of the  Subscriber.  If the  Subscriber  is a trust,
estate or other  fiduciary,  the person executing this Agreement is the trustee,
executor, administrator or other fiduciary.


                                      - 8 -

<PAGE>

      6. (a) It shall be a condition  precedent  to the release of the  purchase
price from escrow on the Initial Closing Date that, on the Initial Closing Date,
the Placement  Agent, on behalf of the Subscriber and other purchasers of Units,
shall have  received the opinion of counsel to the Company,  in form  reasonably
satisfactory to the Placement Agent, that:

                  (i) The Company is a corporation  organized and existing under
the laws of the  State  of  Delaware  with the  corporate  power to  conduct  it
business as the same is presently conducted.

                  (ii) All  corporate  action  necessary  for the  execution and
delivery by the Company of this  Agreement,  the Notes and the Warrants has been
taken, and this Agreement constitutes,  and the Notes and Warrants,  when issued
upon  payment  in full of the  purchase  price  of the  Units  pursuant  to this
Agreement  will  constitute,  the valid and binding  obligations of the Company,
enforceable in accordance with their respective terms,  except as enforceability
may be affected by customary principles governing equitable relief generally and
to any applicable bankruptcy,  moratorium, equitable subordination,  insolvency,
fraudulent conveyance, usury or other laws affecting creditors' rights and their
enforcement  generally,   and  except  that  no  opinion  is  given  as  to  the
enforceability of any indemnification provisions.

                  (iii) The shares of Common Stock issuable upon exercise of the
Warrants have been reserved for issuance and, when issued in accordance with the
terms of the Warrants,  will be duly and validly  authorized  and issued,  fully
paid and nonassessable.

                  (iv) In reliance upon the accuracy of the  representations and
warranties of the Subscriber and the other purchasers of Units contained in this
Agreement and the  Questionnaire and assuming that the Company files in a timely
manner a Form D pursuant  to  Regulation  D of the  Commission  pursuant  to the
Securities  Act,  the  sale  of  the  Units  is  exempt  from  the  registration
requirements of the Securities Act.

            (b) The  Company  shall  pay the  reasonable  fees and  expenses  of
counsel for the Placement Agent in connection with the sale of the Units.

      7. (a) The  Company  agrees  that it will  file a  registration  statement
covering the Warrant  Shares not later than one hundred  twenty (120) days after
the Initial  Closing Date,  will use its best efforts to have such  registration
statement  declared  effective at the earliest practical date and will keep such
registration statement effective until the first to occur of (i) the sale of all
of the Warrant  Shares or (ii) one (1) year from last day on which the  Warrants
or the  Additional  Warrants  may be  exercised.  It shall be a condition to the
obligations  of the Company to include the Warrant  Shares of the  Subscriber in
any  registration  statement that the Subscriber  shall provide the Company in a
timely manner with such  information  as the Company may  reasonably  request in
connection  with the  registration  statement,  including,  but not  limited to,
information   concerning  the  Subscriber,   any  underwriter   engaged  by  the
Subscriber, the proposed manner of distribution of the registered securities and
any specific information relating to the Subscriber


                                      - 9 -

<PAGE>

requested by the  Commission or any stock market on which the  Company's  Common
Stock is traded (collectively, "Seller Information").

            (b) The following provision shall also be applicable:

                  (i)  Following  the   effective   date  of  the   registration
statement,  the Company  shall,  upon the request of the  Subscriber,  forthwith
supply the Subscriber with such number of prospectuses  meeting the requirements
of the Securities Act as shall be reasonably  requested by the Company to permit
the Subscriber to make a public  distribution of the Warrant Shares from time to
time offered or sold by the Subscriber,  provided that the Subscriber shall from
time to time  furnish the  Company  with any Seller  Information  as the Company
shall request in writing. The Company shall also use its best efforts to qualify
the Warrant  Shares for sale in such  states as the  Subscriber  may  reasonably
request;  provided,  however,  that the Company shall not be required to qualify
Warrant  Shares in any state for which the Company  would be required to qualify
to conduct  business as a foreign  corporation  or  otherwise  be subject to the
jurisdiction of courts in such state for matters not relating to the offering.

                  (ii) The Company shall bear the entire cost and expense of the
preparation and filing of the registration  statement pursuant to this Paragraph
7. The  Subscriber  shall,  however,  pay the fees of his or her own counsel and
accountants  and any transfer  taxes or  underwriting  discounts or  commissions
applicable to the shares sold by Subscriber pursuant thereto.

                  (iii)  The  Company  shall  indemnify  and hold  harmless  the
Subscriber and each  underwriter,  within the meaning of the Securities Act, who
may purchase from or sell any Securities for the Subscriber from and against any
and all losses,  claims,  damages and liabilities caused by any untrue statement
or alleged  untrue  statement of a material fact  contained in any  registration
statement under the Securities Act or any prospectus  included  therein required
to be filed or furnished  by reason of this  Paragraph 7 or any  application  or
other  filing under any state  securities  law caused by any omission or alleged
omissions  to state  therein a material  fact  required to be stated  therein or
necessary to make the statements  therein not misleading to which the Subscriber
or any such  underwriter  may  become  subject  under the  Securities  Act,  the
Exchange Act or other Federal or state  statutory law or  regulation,  at common
law or otherwise,  except insofar as such losses, claims, damages or liabilities
are caused by any such untrue  statement or alleged untrue statement or omission
or alleged  omission based upon Seller  Information  furnished in writing to the
Company by any such  holder or  underwriter  expressly  for use  therein,  which
indemnification  shall  include  each  person,  if any,  who  controls  any such
underwriter  within the meaning of the Securities Act; provided,  however,  that
the Subscriber or underwriter shall at the same time indemnify the Company,  its
directors, each officer signing the registration statement, each person, if any,
who controls the Company within the meaning of the Securities Act and each other
person  (the  "other  holders"),  whose  securities  are being  offered  or sold
pursuant to such  registration  statement,  from and against any and all losses,
claims, damages and liabilities caused by any untrue statement or alleged untrue
statement  of a material  fact  contained in any  registration  statement or any
prospectus required to be filed or furnished by


                                     - 10 -

<PAGE>

reason of this  Paragraph  7 or caused by any  omission  or alleged  omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not misleading,  insofar as such losses,  claims, damages
or liabilities are caused by any untrue statement or alleged untrue statement or
omission  based upon Seller  Information  furnished to the Company in writing by
the Subscriber or underwriter expressly for use therein.

                  (iv) If any action or claim  shall be brought or asserted by a
person  entitled  to  indemnification   pursuant  to  Paragraph  7(b)(iii)  this
Agreement  (an  "indemnified  party")  against  the  Company or any  underwriter
engaged by the Company or any person controlling the Company or such underwriter
or against the  Subscriber or any  underwriter  engaged by the Subscriber or any
person  controlling  the  Subscriber  or such  underwriter,  in respect of which
indemnity may be sought pursuant to said Paragraph  7(b)(iii) (an  "indemnifying
party"),  the indemnified party shall promptly notify the indemnifying  party in
writing, and the indemnifying party shall assume the defense thereof,  including
the employment of counsel  reasonably  satisfactory to the indemnified party and
the  payment of all legal and other  expenses.  The  failure of the  indemnified
party to notify the indemnifying  party will not relieve the indemnifying  party
of any liability for indemnification  which it may have to the indemnified party
other than pursuant to Paragraph  7(b)(iii) of this  Agreement.  The indemnified
party shall have the right to employ separate  counsel in any such action and to
participate  in the defense  thereof,  but the fees and expenses of such counsel
shall be at the  expense of the  indemnified  party  unless  (A) the  employment
thereof has been specifically  authorized by the indemnifying  party in writing,
or (B) the  indemnifying  party has  failed to assume  the  defense  and  employ
counsel as provided in this Paragraph 7(b)(iv),  or (C) the named parties to any
such action (including any impleaded  parties) include both an indemnified party
and  an  indemnifying  party,  and in  the  judgment  of  the  counsel  for  the
indemnifying  party,  it is advisable for the  indemnified  party or controlling
person to be  represented  by separate  counsel (in which case the  indemnifying
party shall not have the right to assume the defense of such action on behalf of
the indemnified party or such controlling person), it being understood, however,
that the  indemnifying  party shall,  in connection  with any one such action or
separate but  substantially  similar or related  actions arising out of the same
general  allegations or  circumstances,  be liable for the  reasonable  fees and
expenses of only one separate firm of attorneys at any time in each jurisdiction
for all  indemnified  parties  (whether  pursuant to this Agreement or any other
agreements  granting  registration  rights),  which firm shall be  designated in
writing by all the  indemnified  parties.  The  indemnifying  party shall not be
liable for any settlement of any such action  effected by an  indemnified  party
without  the  written  consent of the  indemnifying  party  (which  shall not be
withheld  unreasonably in light of all factors of importance to such indemnified
party),  but if  settled  with  such  written  consent,  or if  there be a final
judgment or decree for the  plaintiff in any such action by a court of competent
jurisdiction  and the time to appeal shall have expired or the last appeal shall
have been denied,  the indemnifying  party agrees to indemnify and hold harmless
the  indemnified  party from and against any loss or liability by reason of such
settlement or judgment.

                  (v) The  making  of any  request  for  prospectuses  shall not
impose on any  Subscriber  any obligation to exercise any Warrants or Additional
Warrants or sell any Warrant Shares.


                                     - 11 -

<PAGE>

                  (vi)  Notwithstanding any other provision of this Paragraph 7,
the  Subscriber  shall  not have any  right  to have his or her  Warrant  Shares
included  in any  registration  statement  in the event that all of the  Warrant
Shares issued upon exercise of all Warrants and  Additional  Warrants  issued by
the Company may be sold without regard to quantity  limitation  pursuant to Rule
144 of the Commission or any successor rule.

      8. All notices  provided for in this Agreement  shall be in writing signed
by the party giving such notice,  and delivered  personally or sent by overnight
courier or messenger  against receipt thereof or sent by registered or certified
mail (air mail if  overseas),  return  receipt  requested  or by  telecopier  of
receipt of  transmission is confirmed or if transmission is confirmed by mail as
provided in this  Paragraph 8. Notices  shall be deemed to have been received on
the date of personal delivery or telecopy or, if sent by certified or registered
mail,  return  receipt  requested,  shall be deemed to be delivered on the fifth
(5th)  business  day after  the date of  mailing.  Notices  shall be sent to the
Company at 575 Underhill Boulevard,  Syosset,  New York 11791,  telecopier (516)
682-4655,  Attention of Mr.  William V. Carney,  Chairman of the Board and Chief
Executive  Officer,  and to the  Subscriber at his or her address and telecopier
number set forth on the  signature  page or to such  other  address as any party
shall designate in the manner provided in this Paragraph 8.

      9. (a) This Agreement constitutes the entire agreement between the parties
relating  to the  subject  matter  hereof,  superseding  any  and all  prior  or
contemporaneous oral and prior written agreements, understandings and letters of
intent.  This  Agreement  may not be  modified  or amended  nor may any right be
waived except by a writing which expressly refers to this Agreement, states that
it is a  modification,  amendment  or waiver and is signed by all  parties  with
respect to a  modification  or amendment  or the party  granting the waiver with
respect to a waiver.  No course of conduct  or  dealing  and no trade  custom or
usage shall modify any provisions of this Agreement.

            (b) This Agreement  shall be governed by and construed in accordance
with the laws of the State of New York  applicable  to contracts  made and to be
performed entirely within such State. Each party hereby (i) irrevocably consents
and agrees that any legal or equitable action or proceeding  arising under or in
connection  with this  Agreement or any document or  instrument  delivered  with
respect to this Agreement  and/or the Units shall be brought  exclusively in any
Federal or state  court in the County of New York or Nassau,  State of New York,
and (ii) irrevocably submits to and accepts,  with respect to its properties and
assets, generally and unconditionally, the jurisdiction of the aforesaid courts.
In any such  litigation,  each party  waives  personal  service of any  summons,
complaint or other process,  and agrees that the service  thereof may be made by
in the  manner  for  giving  of  notices  provided  for in  Paragraph  8 of this
Agreement (other than by telecopier).

            (c) This Agreement shall be binding upon and inure to the benefit of
the parties hereto, and their respective successors and permitted assigns.


                                     - 12 -

<PAGE>

            (d) In the event that any provision of this Agreement  becomes or is
declared by a court of competent  jurisdiction to be illegal,  unenforceable  or
void,  this  Agreement  shall  continue  in full force and effect  without  said
provision.

            (e)  Each  party   shall,   without   payment   of  any   additional
consideration  by any other party, at any time on or after the sale of the Units
take such  further  action and  execute  such other and  further  documents  and
instruments  as the other  party may request in order to provide the other party
with the benefits of this Agreement.

            (f) All  references  to any gender  shall be deemed to  include  the
masculine, feminine or neuter gender, the singular shall include the plural, and
the plural shall include the singular.

            (g) This Agreement may be executed in two or more counterparts, each
of which shall be deemed an original but all of which together shall  constitute
one and the same document.

            (h) The various representations, warranties, and covenants set forth
in this  Agreement or in any other  writing  delivered in  connection  therewith
shall survive the issuance of the Units.


                                     - 13 -

<PAGE>

      Please confirm your agreement with the foregoing by signing this Agreement
where indicated.

                                             Very truly yours,

Number of Units
Subscribed for:
                                             ___________________________________
_____________                                Name of Subscriber

Total
Purchase Price:                              By:________________________________
                                                           (Signature)
_____________ 
                                             Title, if applicable_______________

Address:_______________________________

_______________________________________

Telecopier Number:____________

Social Security No. or Tax I.D. No.:_________________

The Subscriber is an accredited  investor  based on the following  paragraphs of
Exhibit B to this Agreement:________________

Accepted this      day of
              , 1997

PORTA SYSTEMS CORP.

By:________________________________


                                     - 14 -

<PAGE>

                                                                       Exhibit A

                              Disclosure Documents

      1.    Form of Note.

      2.    Form of Series B Warrant

      3.    Form of Series C Warrant

      4.    Form 10-K for the years ended December 31, 1996 (included in Item 8)
            and 1995.

      5.    Form 10-Q for the quarters ended  September 30, 1997, June 30, 1997,
            March 31,  1997,  September  30,  1996,  June 30, 1996 and March 31,
            1996.

      6.    Form 8-K quarterly reports filed subsequent to December 31, 1995.

      7.    Annual report to stockholders for the year ended December 31, 1996.

      8.    Proxy   statement   for  the  1997  and  1996  Annual   Meetings  of
            Stockholders.

      9.    Press releases  relating to the amendment to the conversion terms of
            the Company's Zero Coupon Senior Subordinated  Convertible Notes due
            January 2, 1998.

- ----------

      The  documents  referred  to in  Items 5, 6, 7, 8 and 9  comprise  the SEC
Documents.  Exhibits  to the SEC  Documents,  which  are not  included,  will be
provided to Subscriber without charge on request.


                                     - 15 -

<PAGE>

                                                                       Exhibit B

      A Subscriber  who meets any one of the  following  tests is an  accredited
investor:

      (a) The  Subscriber  is an  individual  who has a net worth,  or joint net
worth with the Subscriber's spouse, of at least $1,000,000.

      (b) The Subscriber is an individual who had individual income of more than
$200,000 (or $300,000  jointly  with the  Subscriber's  spouse) for the past two
years,  and the Subscriber  has a reasonable  expectation of having income of at
least  $200,000  (or  $300,000  jointly  with the  Subscriber's  spouse) for the
current year.

      (c) The Subscriber is an officer or director of the Company.

      (d)  The  Subscriber  is a bank  as  defined  in  section  3(a)(2)  of the
Securities  Act or any  savings and loan  association  or other  institution  as
defined  in section  3(a)(5)(A)  of the  Securities  Act  whether  acting in its
individual or fiduciary capacity.

      (e) The Subscriber is a broker or dealer registered pursuant to section 15
of the Securities Exchange Act of 1934.

      (f) The Subscriber is an insurance  company as defined in section 2(13) of
the Securities Act.

      (g)  The  Subscriber  is  an  investment   company  registered  under  the
Investment Company Act of 1940 or a business  development  company as defined in
section 2(a)(48) of that Act.

      (h) The Subscriber is a small Business  Investment Company licensed by the
U.S.  Small  Business  Administration  under section  301(c) or (d) of the Small
Business Investment Act of 1958.

      (i) The Subscriber is an employee benefit plan within the meaning of Title
I of the Employee  Retirement  Income  Security Act of 1974,  if the  investment
decision is made by a plan  fiduciary,  as defined in section 3(21) of such Act,
which is either a bank,  savings and loan  association,  insurance  company,  or
registered  investment adviser, or if the employee benefit plan has total assets
in excess of $5,000,000 or, if a self-directed  plan, with investment  decisions
made solely by persons that are accredited investors.

      (j) The Subscriber is a private business development company as defined in
section 202(a)(22) of the Investment Advisers Act of 1940.

      (k) The Subscriber is an  organization  described in Section  501(c)(3) of
the Internal Revenue Code, corporation, Massachusetts or similar business trust,
or partnership, not formed


                                     - 16 -

<PAGE>

for the specific purpose of acquiring the securities offered,  with total assets
in excess of $5,000,000.

      (l) The Subscriber is a trust,  with total assets in excess of $5,000,000,
not formed for the specific purpose of acquiring the securities  offered,  whose
purchase  is  directed  by  a   sophisticated   person  as   described  in  Rule
506(b)(2)(ii) of the Commission under the Securities Act.

      (m) The  Subscriber  is an entity in which all of the  equity  owners  are
accredited  investors  (i.e., all of the equity owners meet one of the tests for
an accredited investor).

      If an  individual  investor  qualifies  as an  accredited  investor,  such
individual  may  purchase  the  Units in the name of his  individual  retirement
account ("IRA").


                                     - 17 -

<PAGE>

      THIS PROMISSORY  NOTE HAS NOT BEEN  REGISTERED  UNDER THE SECURITIES
      ACT OF 1933, AS AMENDED,  OR ANY STATE SECURITIES LAW. IT MAY NOT BE
      SOLD  OR  OTHERWISE  TRANSFERRED  IN  THE  ABSENCE  OF AN  EFFECTIVE
      REGISTRATION  STATEMENT UNDER SAID ACT OR STATE LAW OR AN OPINION OF
      COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED.

                               PORTA SYSTEMS CORP.

                    12% Subordinated Note due January 3, 2000
N-                                                            New York, New York
$ 0,000                                                         January   , 1998

      FOR VALUE  RECEIVED,  Porta Systems  Corp.,  a Delaware  corporation  (the
"Company"),  hereby  promises to pay to the order of  __________________________
("Registered Holder") the principal amount of ________________  thousand dollars
($ 0,000),  on January 3, 2000,  subject to earlier  prepayment  as  hereinafter
provided.  Interest  on such  principal  amount  shall be payable at the rate of
twelve  percent (12%) per annum  semiannually  on the first day of each July and
January to  Registered  Holder of this Note on the fifteenth day of the previous
month,  the first such interest  payment date being July 1, 1998. If any payment
of  interest on or  principal  of this Note is due is on a day on not a business
day,  such  payment  shall be made on the next day which is a  business  day.  A
business day shall mean a day other than a day on which banks in the City of New
York are permitted or required to be closed.  Payments of principal and interest
shall  be  made  in  lawful  money  of the  United  States  of  America  against
presentment of this Note.  Interest shall be payable, to the extent permitted by
law, at the rate equal to the lesser of (i) sixteen  percent  (16%) per annum or
(ii) the maximum rate permitted by law, on the entire unpaid principal amount of
this Note (x) from and after the time that such unpaid  principal  amount  shall
have become due and payable  (whether  at maturity or by  acceleration)  and (y)
during the period that the Company is in default of the provisions of Paragraphs
2(a)(i) and (ii) of this Note  regardless of whether payment of the principal of
this Note has been  accelerated  pursuant to Paragraph  2(a) of this Note.  This
Note is one of a series of the Company's 12%  Subordinated  Notes due January 3,
2000 (collectively,  the "Notes"), in the aggregate principal amount of not less
than three million dollars  ($3,000,000)  which were issued as part of a private
placement (the "Private Placement") of units, each unit consisting of (a) a Note
in the principal amount of one hundred thousand  dollars  ($100,000),  and (b) a
Series B Common Stock Purchase Warrant to purchase ten thousand  (10,000) shares
of the Company's common stock.  Reference in this Note to the "Notes" shall mean
all of the Notes issued pursuant to the Private Placement.

                                   ARTICLE 1.

                       Particular Covenants of the Company

      (a)  Payment  of  Principal  and  Interest.  The  Company  will  duly  and
punctually  pay or cause to be paid the  principal  amount  of this Note and the
interest thereon at the time and in the manner specified in this Note.

      (b) Payment Pursuant to Call Provisions.

            (i) The Company shall advise the  Registered  Holder of this Note by
written notice (the "Offering  Notice")  within ten (10) business days after the
completion of a Qualified

<PAGE>

Offering,  as  hereinafter  defined.  The  Offering  Notice shall state that the
Company has  completed a  Qualified  Offering  and shall  briefly  describe  the
Qualified  Offering.  The  Registered  Holder of this Note shall have the right,
exercisable  by written  notice (the "Call  Notice") to the Company given within
twenty (20) business days after the date of the Offering Notice,  to require the
Company to prepay the principal of this Note, plus accrued interest. The Company
shall prepay the principal of this Note, together with accrued interest,  within
ten (10) business days after its receipt of the Call Notice.

            (ii) A  Qualified  Offering  shall  mean  either  (A) the  public or
private sale of its equity securities  (exclusive of securities sold pursuant to
the  exercise  of  warrants  or  options)  or  (B)  the  issuance  of  unsecured
indebtedness,  in either case in an amount which is not less than the greater of
(x) three million  dollars  ($3,000,000) or (y) the  then-outstanding  principal
amount of Notes. Equity securities includes shares of any class of capital stock
and any notes,  debentures  or other debt  instruments  upon the  conversion  or
exchange  of which  shares of any class of  capital  stock  may be  issued.  Net
proceeds  shall  mean the  gross  proceeds  less any  underwriting  discount  or
commission,  finder's or broker's fees and legal, accounting, printing and other
expenses of the offering.

                                   ARTICLE 2.

                       Events of Default and Acceleration

      (a) Events of Default Defined.  The entire unpaid principal amount of this
Note,  together  with  interest  thereon  shall,  on  written  notice  from  the
Registered  Holders  of Notes in the  principal  amount of not less  than  fifty
percent  (50%) of the  aggregate  principal  amount of Notes  then  outstanding,
forthwith  become and be due and  payable  if any one or more  Events of Default
shall have occurred (for any reason  whatsoever and whether such happening shall
be  voluntary  or  involuntary  or be affected or come about by operation of law
pursuant to or in compliance with any judgment,  decree or order of any court or
any order, rule or regulation of any administrative or governmental body) and be
continuing. An Event of Default shall occur:

            (i) if failure shall be made in the due and punctual  payment of the
principal of the Notes when and as the same shall become due and payable whether
at maturity or  otherwise,  and such failure  shall have  continued for five (5)
business days;

            (ii) if failure shall be made in the due and punctual payment of any
installment  of interest on the Notes when and as the same shall  become due and
payable, and such failure shall have continued for ten (10) business days;

            (iii)  if  the  maturity  of  any  Senior   Indebtedness   shall  be
accelerated as a result of a breach of or default under any instrument governing
the terms of such Senior Indebtedness.

            (iv) if the Company shall consent to the  appointment of a receiver,
trustee or  liquidator of itself or of a  substantial  part of its property,  or
shall admit in writing its  inability to pay its debts  generally as they become
due, or shall make a general  assignment for the benefit of creditors,  or shall
file a voluntary petition in bankruptcy,  or an answer seeking reorganization in
a  proceeding  under any  bankruptcy  law (as now or  hereafter in effect) or an
answer  admitting  the  material  allegations  of a petition  filed  against the
Company,  in any such  proceeding,  or shall by  voluntary  petition,  answer or
consent, seek relief under the provisions of any other now existing


                                      - 2 -

<PAGE>

or future  bankruptcy or other similar law providing for the  reorganization  or
winding  up  of  corporations,  or an  arrangement,  composition,  extension  or
adjustment  with its or their  creditors,  or shall, in a petition in bankruptcy
filed  against  it or them be  adjudicated  a  bankrupt,  or the  Company or its
directors  or the  holders of a majority  of its equity  interest  shall vote to
dissolve or liquidate the Company;

            (v) if a court of  competent  jurisdiction  shall  enter  an  order,
judgment  or decree  appointing,  without  consent of the  Company,  a receiver,
trustee or  liquidator of the Company or of all or any  substantial  part of the
property  of the  Company,  or  approving a petition  filed  against the Company
seeking a  reorganization  or  arrangement  of the  Company  under  the  Federal
bankruptcy  laws or any other  applicable law or statute of the United States of
America or any State  thereof,  or any  substantial  part of the property of the
Company shall be  sequestered;  and such order,  judgment or decree shall not be
vacated  or set aside or  stayed  within  ninety  (90) days from the date of the
entry thereof; or

            (vi) if,  under the  provisions  of any law for the relief or aid of
debtors, any court of competent  jurisdiction shall assume custody or control of
the Company or of all or any substantial part of the property of the Company and
such custody or control  shall not be  terminated  or stayed  within ninety (90)
days from the date of assumption of such custody or control.

      (b) Rights of Note  Holder.  Nothing in this Note  shall be  construed  to
modify,  amend or limit in any way the right of the holder of this Note to bring
an action  against the Company in the event the Company fail to pay principal of
or interest on this Note when due.

                                   ARTICLE 3.

                                  Subordination

      (a) Agreement of Subordination.  The Company,  for itself,  its successors
and  assigns,  covenants  and agrees,  and the  Registered  Holder by his or her
acceptance of this Note likewise  covenants and agrees,  that the payment of the
principal of and interest on this Note is hereby expressly subordinated,  to the
extent and in the manner  hereinafter set forth, to the prior payment in full of
all Senior Indebtedness,  as hereinafter defined. The provisions of this Article
3 shall  constitute a continuing offer to all persons who, in reliance upon such
provision, become holders of, or continue to hold, Senior Indebtedness, and such
provisions are made for the benefit of the holders of Senior  Indebtedness,  and
such holders are hereby made obligees  hereunder the same as if their names were
written herein as such, and they and/or each of them may proceed to enforce such
provisions.

      (b)  Company  Not to  Make  Payments  with  Respect  to  Note  in  Certain
Circumstances.

            (i) Upon the maturity of any Senior  Indebtedness  by lapse of time,
acceleration  or  otherwise,  all  principal  thereof and  premium,  if any, and
interest  thereon shall first be paid in full, or such payment duly provided for
in cash or in a manner  satisfactory  to the holder or  holders  of such  Senior
Indebtedness,  before any  payment is made by the  Company (A) on account of the
principal of or interest on this Note or (B) to acquire this Note.

            (ii) Upon the  happening  of an event of default with respect to any
Senior  Indebtedness,  as such event of  default  is  defined  therein or in the
instrument under which it is


                                      - 3 -

<PAGE>

outstanding,  permitting the holders to accelerate the maturity thereof, and, if
the default is other than default in payment of the principal of or premium,  if
any, or interest on such Senior Indebtedness,  upon written notice thereof given
to the  Company by the holder or holders of such  Senior  Indebtedness  or their
representative or representatives,  then, unless and until such event of default
shall have been cured or waived or shall have ceased to exist,  no payment shall
be made by the  Company (A) on account of the  principal  of or interest on this
Note or (B) to acquire this Note.

            (iii) In the  event  that,  notwithstanding  the  provision  of this
Paragraph  3(b), the Company shall make any payment to the Registered  Holder on
account of the  principal  of or interest on this Note after the  happening of a
default in payment of the  principal  of or premium,  if any,  or  interest  on,
Senior  Indebtedness  or after  receipt by the  Company of written  notice of an
event of  default  with  respect to any Senior  Indebtedness  and after  written
notice  of such  default  or event of  default  is given by the  Company  to the
Registered holder,  then unless and until such default or event of default shall
have been cured or waived or shall have ceased to exist,  such payment  shall be
held by the  Registered  Holder in trust for the  benefit  of, and shall be paid
forthwith over and delivered to, the holders of Senior Indebtedness (pro rata as
to each of such  holders  on the  basis  of the  respective  amounts  of  Senior
Indebtedness  held by them) or their  representative  or the  trustee  under the
indenture  or  other  agreement  (if any)  pursuant  to  which  any  instruments
evidencing any Senior  Indebtedness  may have been issued,  as their  respective
interests may appear, for application to the payment of all Senior  Indebtedness
remaining unpaid to the extent necessary to pay all Senior  Indebtedness in full
in accordance with the terms of such Senior Indebtedness, after giving effect to
any  concurrent  payment  or  distribution  to or  for  the  holders  of  Senior
Indebtedness.

      (c) Note  Subordinated  to Prior  Payment  of all Senior  Indebtedness  on
Dissolution,  Liquidation or Reorganization of Company. Upon any distribution of
assets  of  the  Company  upon  any  dissolution,  winding  up,  liquidation  or
reorganization of the Company (whether in bankruptcy, insolvency or receivership
proceedings or upon an assignment for the benefit of creditors or otherwise):

            (i) The holders of all Senior  Indebtedness  shall first be entitled
to receive  payment  in full of the  principal  thereof,  premium,  if any,  and
interest  due thereon  before the  Registered  Holder is entitled to receive any
payment on account of the  principal  of or  interest  on this Note  (other than
payment  of shares of stock of the  Company as  reorganized  or  readjusted,  or
securities  of the Company or any other  corporation  provided  for by a plan of
reorganization  or readjustment  which stock and securities are  subordinated to
the payment of all Senior  Indebtedness and securities  received in lieu thereof
which may at the time be outstanding); and

            (ii) Any  payment or  distribution  of assets of the  Company of any
kind or character whether in cash,  property or securities (other than shares of
stock of the Company as reorganized or readjusted,  or securities of the Company
or  any  other  corporation   provided  for  by  a  plan  of  reorganization  or
readjustment  which stock and securities are  subordinated to the payment of all
Senior  Indebtedness  and  securities  received in lieu thereof which may at the
time be  outstanding),  to which the Registered  Holder would be entitled except
for the provisions of this Article 3, shall be paid by the  liquidating  trustee
or agent or other person making such payment of distribution,  whether a trustee
in  bankruptcy,  a receiver or  liquidating  trustee or other  trustee or agent,
directly  to the  holders  of Senior  Indebtedness  or their  representative  or
representatives,  or to the trustee or trustees under any indenture  under which
any instruments evidencing any of such Senior


                                      - 4 -

<PAGE>

Indebtedness  may have been issued,  to the extent  necessary to make payment in
full of all Senior  Indebtedness  remaining  unpaid,  after giving effect to any
concurrent  payment or distribution or provision therefor to the holders of such
Senior Indebtedness.

            (iii) In the event that  notwithstanding  the foregoing provision of
this Article 3, any payment or distribution of assets of the Company of any kind
or  character,  whether in cash,  property or  securities  (other than shares of
stock of the Company as reorganized or readjusted,  or securities of the Company
or  any  other  corporation   provided  for  by  a  plan  of  reorganization  or
readjustment  which stock and securities are  subordinated to the payment of all
Senior  Indebtedness  and  securities  received in lieu thereof which may at the
time be outstanding),  shall be received by the Registered  Holder on account of
principal of or interest on this Note before all Senior  Indebtedness is paid in
full, or effective provision made for its payment or distribution,  such payment
or  distribution  shall be received and held in trust for and shall be paid over
to the holders of the Senior Indebtedness  remaining unpaid or unprovided for or
their representative or representatives, or to the trustee or trustees under any
indenture under which any instruments evidencing any of such Senior Indebtedness
may have been issued, for application to the payment of such Senior Indebtedness
until all such Senior  Indebtedness  shall have been paid in full,  after giving
effect to any concurrent  payment or distribution  or provision  therefor to the
holders of such Senior Indebtedness.

      (d)   Noteholder   to  be   Subrogated  to  Right  of  Holders  of  Senior
Indebtedness.  Subject to the  payment in full of all Senior  Indebtedness,  the
Registered  Holder  shall be  subrogated  to the rights of the holders of Senior
Indebtedness  to receive  payments  or  distributions  of assets of the  Company
applicable to the Senior Indebtedness until all amounts owing on this Note shall
be paid in full,  and,  for the  purpose of such  subrogation,  no  payments  or
distributions  to the holders of the Senior  Indebtedness by or on behalf of the
Company or by or on behalf of the Registered  Holder by virtue of this Article 3
which  otherwise  would  have been made to the  holders of this Note  shall,  as
between the Company and the  Registered  Holder,  be deemed to be payment by the
Company to or on account of the Senior  Indebtedness,  it being  understood that
the provisions of this Article 3 are, and are intended  solely,  for the purpose
of defining  the relative  rights of the holders of this Note,  on the one hand,
and the holders of the Senior Indebtedness, on the other hand.

      (e)  Obligation of the Company  Unconditional.  Nothing  contained in this
Article 3 or  elsewhere  in this Note is intended to or shall  impair as between
the Company and the Registered Holder,  the obligation of the Company,  which is
absolute and unconditional, to pay to the Registered Holder the principal of and
interest  on this Note as and when the same  shall  become  due and  payable  in
accordance  with their  terms,  or is intended to or shall  affect the  relative
rights of the  Registered  Holder and  creditors  of the Company  other than the
holders of the Senior Indebtedness, nor shall anything herein or therein prevent
the  Registered  Holder of this  Note from  exercising  all  remedies  otherwise
permitted by applicable law upon default under this Note, subject to the rights,
if any, under this Article 3 of the holders of Senior Indebtedness in respect of
cash,  property or securities  of the Company  received upon the exercise of any
such remedy.  Upon any distribution of assets of the Company referred to in this
Article 3, the  holders of this Note shall be entitled to rely upon any order or
decree made by any court of  competent  jurisdiction  in which any  dissolution,
winding  up,  liquidation  or  reorganization  proceedings  are  pending,  or  a
certificate  of the  liquidating  trustee  or agent or other  person  making any
distribution  to the  Registered  Holder  for the  purpose of  ascertaining  the
persons entitled to participate in such distribution,  the holders of the Senior
Indebtedness and other indebtedness of the Company, the


                                      - 5 -

<PAGE>

amount  thereof or payable  thereon,  the amount or amounts paid or  distributed
thereon and all other facts pertinent thereto or to this Article 3.

      (f) Subordination  Rights Not Impaired by Acts or Omissions of the Company
or Holders of Senior Indebtedness.  No right of any present or future holders of
any Senior Indebtedness to enforce subordination as herein provided shall at any
time in any way be  prejudiced  or  impaired by any act or failure to act on the
part of the Company or by any act or failure to act, in good faith,  by any such
holder,  or by any  noncompliance by the Company with the terms,  provisions and
covenants  of this Note,  regardless  of any  knowledge  thereof  which any such
holder may have or be otherwise charged with.

      (g) Definition of Senior Indebtedness.  The term "Senior  Indebtedness" is
defined to mean the  principal  of and  premium,  if any,  and  interest  on the
following:  (i) all indebtedness and obligations (other than the Notes) that are
created,  assumed or  guaranteed  by the  Company,  whether  before or after the
issuance  of the  Notes,  that are (A) for  money  borrowed  or (B)  secured  by
purchase  money  mortgages  or other  similar  security  interests  given by the
Company or any subsidiary on real or personal property,  (ii) all obligations of
the Company or of others which are guaranteed by the Company,  whether  existing
on or after  the  issuance  of the  Notes,  as  lessee  under a lease of real or
personal  property,  which in  accordance  with  generally  accepted  accounting
principles have been  capitalized,  unless,  with respect to any indebtedness or
obligations  described  in  clause  (i) or  (ii)  of this  Paragraph  3(g),  the
instrument creating or evidencing such indebtedness expressly provides that such
indebtedness  is not  superior  in right of  payment  of the  Notes,  (iii)  all
indebtedness  or  obligations of a kind not described in said clause (i) or (ii)
which  were  incurred  or  guaranteed  by the  Company  in  connection  with the
acquisition  of an existing  business  or assets,  whether by means of a merger,
consolidation,  stock acquisition or acquisition of all or part of the assets of
a corporation,  partnership,  limited  lability  company,  business trust,  sole
proprietorship or other entity, or otherwise, and (iv) any deferrals,  renewals,
extensions  or refundings of any of the  foregoing,  unless,  in the case of any
particular  indebtedness  or  obligation  or  renewal,  extension  or  refunding
thereof,  under the express provisions of the instrument  creating or evidencing
the same, or pursuant to which the same is  outstanding,  such  indebtedness  or
other obligation or such renewal, extension or refunding thereof is not superior
in right of payment to this Note. Senior  Indebtedness shall not include (a) the
Company's 6% Convertible  Subordinated Debentures Due July 1, 2002, on which the
Company is presently in default,  (b) indebtedness  incurred for compensation to
employees, or (c) other indebtedness incurred in the ordinary course of business
for goods, materials, or services or any obligations of the Company under, or in
respect  of,  leases  other  than  as  hereinbefore  described.   There  are  no
restrictions on the right of the Company to incur Senior Indebtedness.

      (h) Right of Registered Holder to Hold Senior Indebtedness. The Registered
Holder  shall be  entitled  to all of the rights set forth in this  Article 3 in
respect of any Senior  Indebtedness at any time held by the Registered Holder to
the same extent as any other holder of Senior Indebtedness,  and nothing in this
Article 3 or elsewhere in this Note shall be construed to deprive the Registered
Holder of any of its rights as such holder.


                                      - 6 -

<PAGE>

                                   ARTICLE 4.

                                  Miscellaneous

      (a)  Transferability.  No transfer of this Note shall be effective  unless
such  transfer  is made in  compliance  with all  applicable  Federal  and state
securities  laws and the  Registered  Holder  shall  provide  to the  Company an
opinion of counsel,  which counsel and opinion shall be reasonably acceptable to
the Company,  as to the  exemption  from the  registration  requirements  of the
Securities Act of 1933, as amended,  and applicable  state  securities laws. The
Company  shall be  entitled  to treat as the owner of this Note only the  person
shown as the Registered  Holder on its books and records,  regardless of whether
the Company has any contrary knowledge.

      (b) WAIVER OF TRIAL BY JURY. IN ANY LEGAL PROCEEDING TO ENFORCE PAYMENT OF
THIS NOTE,  THE COMPANY  AND, BY THE  ACCEPTANCE  OF THIS NOTE,  THE  REGISTERED
HOLDER, THE NOTEHOLDER WAIVES TRIAL BY JURY.

      (c) Right of Prepayment.  The Company may prepay the Notes at whole at any
time or in part from time to time, on not less than ten (10) nor more than forty
(40) days' written notice without  payment of any penalty or premium;  provided,
that any partial prepayment of the Notes shall be in an amount which is not less
than the lesser of one million  dollars  ($1,000,000).  Any prepayment  shall by
accompanied  by payment of accrued  interest to the date of payment.  Prepayment
shall  be made,  to the  extent  practical,  proportional  as to the  Registered
Holders of the outstanding  Notes based on the respective  principal  amounts of
their  Notes;  provided,  that the  Company  may redeem in full the Notes of any
Registered Holder the principal amount of whose Note is not significant relative
to the total outstanding principal amount of Notes.

      (d) Notice to Company. Notice to the Company shall be given to the Company
at  their  principal  executive  offices,  presently  located  at 575  Underhill
Boulevard, Syosset, New York 11791, or to such other address as the Company may,
from time to time, advise the Registered Holder of this Note.

      (e) Governing Law. This Note shall be governed by the laws of the State of
New York  applicable  to agreements  executed and to be performed  wholly within
such State. The Company,  and by acceptance of this Note, the Registered Holder,
consents to the exclusive  jurisdiction  of the United States District Court for
the Southern or Eastern  District of New York and Supreme  Court of the State of
New York in the  County  of  Nassau  or New York in any  action  relating  to or
arising out of this Note.

      IN WITNESS  WHEREOF,  the Company has  executed  this Note on the date and
year first aforesaid.

                                            PORTA SYSTEMS CORP.

                                            By: ________________________


                                      - 7 -

<PAGE>

                                                                      Warrant to
WB-                                                                    Purchase
                                                                      ** ,000**
                                                                        Shares

NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK  ISSUABLE  UPON  EXERCISE OF
THIS WARRANT HAVE BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933 OR ANY STATE
SECURITIES  LAWS,  AND  NEITHER  THIS  WARRANT  NOR  SUCH  SHARES  MAY BE  SOLD,
ENCUMBERED OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER SUCH ACTS OR AN EXEMPTION FROM SUCH  REGISTRATION  REQUIREMENTS,
AND, IF AN EXEMPTION  SHALL BE  APPLICABLE,  THE HOLDER SHALL HAVE  DELIVERED AN
OPINION OF COUNSEL  ACCEPTABLE  TO THE  COMPANY  THAT SUCH  REGISTRATION  IS NOT
REQUIRED.

          Void after 5:00 P.M. New York City time on December 31, 2002

                     SERIES B COMMON STOCK PURCHASE WARRANT
                                       OF
                               PORTA SYSTEMS CORP.

      This is to certify that, FOR VALUE  RECEIVED,  ___________________________
or assigns  ("Holder"),  is entitled to purchase,  subject to the  provisions of
this Warrant,  from Porta Systems Corp., a Delaware corporation (the "Company"),
at an exercise price of three and 00/100 dollars  ($3.00) per share,  subject to
adjustment   as   provided   in   this   Warrant   (the    "Exercise    Price"),
____________________  thousand  (___,000)  shares of the Company's common stock,
par value $.01 per share  ("Common  Stock") at any time  during the period  (the
"Exercise Period"),  as hereinafter  defined. The Exercise Period shall mean the
period  commencing on the date of issuance of this Warrant and ending on at 5:00
P.M. New York City time on December 31, 2002;  provided,  however,  that if such
date is a day on  which  banking  institutions  in the  State  of New  York  are
authorized by law to close,  then on the next  succeeding day which shall not be
such a day. The securities  issuable upon exercise of this Warrant and the price
to be paid  for  such  securities  may  also be  adjusted  from  time to time as
hereinafter  set forth.  Reference  in the Warrant to the "Series B Warrants" or
the  "Warrants"  shall  mean any or all of the  Series B Common  Stock  Purchase
Warrants  issued  by the  Company.  The  shares of Common  Stock  issuable  upon
exercise of this Warrant are referred to as the "Warrant Shares."

      (a) EXERCISE OF WARRANT.

            (1) This  Warrant may be  exercised  in whole at any time or in part
from time to time  during the  Exercise  Period by  presentation  and  surrender
hereof to the  Company at its  principal  office,  or at the office of its stock
transfer  agent, if any, with the Purchase Form annexed hereto duly executed and
accompanied  by payment of the Exercise  Price for the number of Warrant  Shares
specified in such form.  If this Warrant  should be exercised in part only,  the
Company  shall,  upon  surrender of this Warrant for  cancellation,  execute and
deliver a new Warrant evidencing the rights of the Holder hereof to purchase the
balance of the Warrant Shares

<PAGE>

purchasable  hereunder.  Upon  receipt  by the  Company  of this  Warrant at its
office,  or by the stock transfer agent of the Company at its office,  in proper
form for exercise,  the Holder shall be deemed to be the holder of record of the
Warrant  Shares  issuable  upon such  exercise,  notwithstanding  that the stock
transfer  books  of the  Company  shall  then be  closed  or  that  certificates
representing  such Warrant  Shares  shall not then be actually  delivered to the
Holder.  Payment of the  Exercise  Price of this Warrant may also be made by the
application,  first of accrued  interest and then principal of the Company's 12%
Subordinated Notes due January 3, 2000, by tendering such notes for cancellation
(to the extent set forth in the  Purchase  Form).  To the extent that the entire
principal  balance plus accrued interest on such note is not applied to exercise
of this  Warrant,  the  Company  shall  issue  to the  Holder a new note for the
remaining balance of the principal amount of such note.

            (2) If,  at any  time  subsequent  to the one  hundred  sixty  fifth
(165th) day following the Issue Date, as hereinafter defined, the Warrant Shares
are not covered by an effective  registration statement under the Securities Act
of 1933, as amended (the "Securities  Act"), and only for so long as the Warrant
Shares are not covered by such an effective registration  statement,  the Holder
of this Warrant shall have the cashless exercise right as set forth in Paragraph
(a)(3) of this Warrant.

            (3) The cashless exercise right shall mean the right to either:

                  (A) exchange or convert this  Warrant,  in whole or in part to
the extent that this Warrant has not previously been  exercised,  for the number
of shares of Common Stock determined by (i) multiplying (x) the number of shares
as to which this Warrant is being  exercised by (y) the  difference  between the
current  value  per  share of Common  Stock as of the date of  exercise  and the
Exercise  Price per share,  as in effect on such  date,  and (ii)  dividing  the
result so obtained by the current value per share of Common Stock as of the date
of exercise; or

                  (B) exercise this Warrant, in whole or in part, by delivery of
such  number  of shares of  Common  Stock as has a  current  value  equal to the
Exercise Price.

            (4) The date of exercise  shall mean the date on which this  Warrant
accompanied by the notice of exercise is received by the Company or its transfer
agent.

            (5) The current  value per share of Common Stock shall be determined
as follows:

                  (A) If the  Common  Stock is listed on a  national  securities
exchange or admitted to unlisted  trading  privileges on such exchange or listed
for trading on the Nasdaq Stock Market  ("Nasdaq") or other automated  quotation
system which provides  information as to the last sale price,  the current value
shall be the  average of the  reported  last sale  prices of one share of Common
Stock on such  exchange or system on the last five (5) trading days prior to the
date of exercise of this Warrant,  or if, on any of such dates,  no such sale is
made on such day,  the average of the closing bid and asked prices for such date
on such exchange or system shall be used; or


                                      - 2 -

<PAGE>

                  (B) If the  Common  Stock  is not so  listed  or  admitted  to
unlisted trading privileges,  the current value shall be the mean the average of
the reported  last bid and asked prices of one share of Common Stock as reported
by Nasdaq,  the  National  Quotation  Bureau,  Inc. or other  similar  reporting
service,  on the last five (5) trading day prior to the date of the  exercise of
this Warrant; or

                  (C) If the  Common  Stock  is not so  listed  or  admitted  to
unlisted  trading  privileges and bid and asked prices are not so reported,  the
current  value of one share of Common  Stock  shall be an amount,  not less than
book value,  determined  in such  reasonable  manner as may be prescribed by the
Board of Directors of the Company.

      (b)  RESERVATION  OF SHARES.  The Company  hereby agrees that at all times
there shall be reserved  for  issuance  and/or  delivery  upon  exercise of this
Warrant  such number of shares of Common Stock as shall be required for issuance
and delivery  upon  exercise of this Warrant and that it shall not,  without the
prior  approval of the holders of a majority of the Warrants  then  outstanding,
increase the par value of the Common Stock.

      (c) FRACTIONAL  SECURITIES.  No fractional  shares or script  representing
fractional  shares  shall be issued  upon the  exercise  of this  Warrant.  With
respect to any fraction of a share called for upon any exercise of this Warrant,
the  Company  shall pay to the Holder an amount in cash  equal to such  fraction
multiplied  by the current  value of such  fractional  share,  determined in the
manner set forth in Paragraph  (a)(5) of this  Warrant,  except that the current
value  shall mean the closing  price on the last  trading day before the date of
exercise.

      (d) EXCHANGE,  TRANSFER,  ASSIGNMENT  OR LOSS OF WARRANT.  This Warrant is
exchangeable,  without expense,  at the option of the Holder,  upon presentation
and  surrender  hereof to the  Company  or at the  office of its stock  transfer
agent,  if any, for other  Warrants of  different  denominations  entitling  the
holder  thereof to purchase in the aggregate the same number of shares of Common
Stock purchasable hereunder.  Subject to the provisions of Paragraph (j) of this
Warrant,  upon  surrender of this Warrant to the Company or at the office of its
stock  transfer  agent,  if any, with the  Assignment  Form annexed  hereto duly
executed  and funds  sufficient  to pay any  transfer  tax,  the Company  shall,
without  charge,  execute and deliver a new Warrant in the name of the  assignee
named in such  instrument  of  assignment  and this  Warrant  shall  promptly be
canceled.  This  Warrant may be divided or combined  with other  Warrants  which
carry the same rights upon  presentation  hereof at the office of the Company or
at the  office of its stock  transfer  agent,  if any,  together  with a written
notice  specifying the names and  denominations  in which new Warrants are to be
issued  and signed by the  Holder  hereof.  The term  "Warrant"  as used  herein
includes any Warrants into which this Warrant may be divided or exchanged.  Upon
receipt  by the  Company  of  evidence  satisfactory  to it of the loss,  theft,
destruction  or mutilation of this Warrant,  and (in the case of loss,  theft or
destruction) of reasonably satisfactory indemnification,  and upon surrender and
cancellation of this Warrant, if mutilated, the Company will execute and deliver
a new Warrant of like tenor.  Any such new Warrant  executed and delivered shall
constitute  an  additional  contractual  obligation  on the part of the Company,
whether or not this Warrant so lost, stolen, destroyed, or mutilated shall be at
any time enforceable by anyone.


                                      - 3 -

<PAGE>

      (e) RIGHTS OF THE HOLDER. The Holder shall not, by virtue of this Warrant,
be  entitled to any rights of a  stockholder  in the  Company,  either at law or
equity,  and the  rights of the Holder are  limited  to those  expressed  in the
Warrant and are not  enforceable  against  the Company  except to the extent set
forth herein.

      (f) ANTI-DILUTION PROVISIONS. The Exercise Price in effect at any time and
the number and kind of  securities  purchasable  upon  exercise of each  Warrant
shall be subject to adjustment as follows:

            (1) If the Company shall,  subsequent to the first date on which the
Company  shall have  issued a Series B Warrant  (the  "Issue  Date"),  (A) pay a
dividend  or make a  distribution  on its  shares of  Common  Stock in shares of
Common Stock,  (B) subdivide or reclassify its  outstanding  Common Stock into a
greater number of shares,  or (C) combine or reclassify its  outstanding  Common
Stock into a smaller number of shares or otherwise  effect a reverse split,  the
Exercise  Price in effect at the time of the record  date for such  dividend  or
distribution  or of the  effective  date of  such  subdivision,  combination  or
reclassification  shall be  proportionately  adjusted so that the Holder of this
Warrant  exercised  after such date shall be entitled  to receive the  aggregate
number and kind of shares which, if this Warrant had been exercised  immediately
prior to such time,  he would have owned upon such exercise and been entitled to
receive upon such dividend, subdivision,  combination or reclassification.  Such
adjustment  shall  be  made  successively  whenever  any  event  listed  in this
Paragraph (f)(1) shall occur.

            (2) In case the Company shall,  subsequent to the Issue Date,  issue
rights  or  warrants  to all  holders  of its  Common  Stock  entitling  them to
subscribe for or purchase shares of Common Stock (or securities convertible into
Common Stock) at a price (or having a conversion  price per share) less than the
current market price of the Common Stock (as defined in Paragraph (f)(5) of this
Warrant)  on the record  date  mentioned  below,  the  Exercise  Price  shall be
adjusted  so that the  Exercise  Price  shall  equal  the  price  determined  by
multiplying the Exercise Price in effect  immediately  prior to the date of such
issuance by a fraction,  the numerator of which shall be the number of shares of
Common Stock  outstanding on the record date mentioned  below plus the number of
additional  shares of Common  Stock which the  aggregate  offering  price of the
total number of shares of Common Stock so offered (or the  aggregate  conversion
price of the  convertible  securities so offered) would purchase at such current
market price per share of the Common Stock,  and the  denominator of which shall
be the number of shares of Common Stock outstanding on such record date plus the
number  of  additional  shares of  Common  Stock  offered  for  subscription  or
purchased (or into which the convertible securities so offered are convertible).
Such adjustment shall be made successively  whenever such rights or warrants are
issued and shall  become  effective  immediately  after the record  date for the
determination of stockholders  entitled to receive such rights or warrants;  and
to the extent that shares of Common Stock or securities  convertible into Common
Stock are not delivered  after the  expiration  of such rights or warrants,  the
Exercise  Price shall be readjusted to the Exercise Price which would then be in
effect had the  adjustments  made upon the  issuance  of such rights or warrants
been  made  upon the basis of  delivery  of only the  number of shares of Common
Stock (or securities convertible into Common Stock) actually delivered.


                                      - 4 -

<PAGE>

            (3) In  case  the  Company  shall,  subsequent  to the  Issue  Date,
distribute  to all holders of Common  Stock  evidences  of its  indebtedness  or
assets  (excluding cash dividends or distributions  paid out of current earnings
and dividends or distributions  referred to in Paragraph (f)(1) of this Warrant)
or  subscription  rights or warrants  (excluding  those referred to in Paragraph
(f)(2) of this  Warrant),  then in each such case the  Exercise  Price in effect
thereafter  shall be  determined  by  multiplying  the Exercise  Price in effect
immediately  prior thereto by a fraction,  of which the  numerator  shall be the
total number of shares of Common  Stock  outstanding  multiplied  by the current
market price per share of Common  Stock (as defined in Paragraph  (f)(5) of this
Warrant),  less the fair market value (as  determined by the Company's  Board of
Directors) of said assets or evidences of indebtedness so distributed or of such
rights or warrants,  and of which the  denominator  shall be the total number of
shares of Common Stock  outstanding  multiplied by such current market price per
share of Common Stock. Such adjustment shall be made successively  whenever such
a  record  date is  fixed.  Such  adjustment  shall  be made  whenever  any such
distribution  is made and shall become  effective  immediately  after the record
date  for  the   determination   of   stockholders   entitled  to  receive  such
distribution.

            (4)  Whenever  the  Exercise  Price  payable  upon  exercise of each
Warrant is adjusted pursuant to Paragraphs  (f)(1),  (2) or (3) of this Warrant,
the number of shares of Common Stock  purchasable  upon exercise of each Warrant
shall  simultaneously  be adjusted by multiplying the number of shares of Common
Stock  issuable  upon  exercise of each Warrant in effect on the date thereof by
the  Exercise  Price in effect on the date  thereof and  dividing the product so
obtained by the  Exercise  Price,  as  adjusted.  In no event shall the Exercise
Price per share be less than the par value per  share,  and,  if any  adjustment
made pursuant to Paragraph (f)(1),  (2) or (3) would result in an exercise price
of less than the par value per share,  then, in such event,  the Exercise  Price
per share shall be the par value per share.

            (5) For the purpose of any computation  under Paragraphs  (f)(2) and
(3) of this Warrant,  the current  market price per share of Common Stock at any
date shall be deemed to be the average of the daily closing  prices for ten (10)
consecutive  trading days commencing  twenty (20) trading days before such date.
The closing price for each day shall be the reported last sale price regular way
or, in case no such  reported  sale takes place on such day,  the average of the
reported last bid and asked prices  regular way, in either case on the principal
national securities exchange on which the Common Stock is admitted to trading or
listed on Nasdaq,  or if not listed or admitted  to trading on such  exchange or
such System,  the average of the reported  highest bid and reported lowest asked
prices as reported  by Nasdaq,  the  National  Quotation  Bureau,  Inc. or other
similar  organization if Nasdaq is no longer reporting such  information,  or if
not so available, the fair market price as determined by the Board of Directors.

            (6) No  adjustment  in the Exercise  Price shall be required  unless
such  adjustment  would  require an  increase  or  decrease of at least one cent
($0.01) in such price;  provided,  however, that any adjustments which by reason
of this  Paragraph  (f)(6) are not required to be made shall be carried  forward
and taken into account in any subsequent adjustment. All calculations under this
Paragraph (f) shall be made to the nearest cent or to the nearest  one-hundredth
of a share,  as the case may be.  Anything in this Paragraph (f) to the contrary
notwithstanding,  the Company shall be entitled,  but shall not be required,  to
make such changes in the Exercise  Price,  in addition to those required by this
Paragraph (f), as it in its discretion shall


                                      - 5 -

<PAGE>

determine to be advisable in order that any dividend or  distribution  in shares
of Common Stock,  subdivision,  reclassification or combination of Common Stock,
issuance of warrants to purchase  Common Stock or  distribution  of evidences of
indebtedness or other assets (excluding cash dividends)  referred to hereinabove
in this Paragraph (f) hereafter made by the Company to the holders of its Common
Stock  shall  not  result  in any tax to the  holders  of its  Common  Stock  or
securities convertible into Common Stock.

            (7) The Company may retain a firm of independent  public accountants
of  recognized  standing  selected  by the  Board of  Directors  (who may be the
regular accountants employed by the Company) to make any computation required by
this  Paragraph  (f), and a certificate  signed by such firm shall be conclusive
evidence of the correctness of such adjustment.

            (8) In the event that at any time, as a result of an adjustment made
pursuant  to  Paragraph  (f)(1)  of this  Warrant,  the  Holder  of any  Warrant
thereafter  shall become  entitled to receive any shares of the  Company,  other
than Common Stock, thereafter the number of such other shares so receivable upon
exercise of any Warrant  shall be subject to  adjustment  from time to time in a
manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in Paragraphs (f)(1) to (6), inclusive, of
this Warrant.

            (9)  Irrespective  of any  adjustments  in the Exercise Price or the
number  or kind of  shares  purchasable  upon  exercise  of  Warrants,  Warrants
theretofore  or  thereafter  issued may  continue  to express the same price and
number and kind of shares as are stated in this and similar  Warrants  initially
issued by the Company.

            (10) In the  event  that at any time,  as a result of an  adjustment
made  pursuant to Paragraph  (f)(1) of this  Warrant,  the Holder of any Warrant
thereafter  shall become  entitled to receive any shares of the  Company,  other
than Common Stock, thereafter the number of such other shares so receivable upon
exercise of any Warrant  shall be subject to  adjustment  from time to time in a
manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in Paragraphs (f)(1) to (8), inclusive, of
this Warrant.

      (g) OFFICER'S  CERTIFICATE.  Whenever the Exercise Price shall be adjusted
as required by the provisions of Paragraph (f) of this Warrant subsequent to the
Effective Date, the Company shall forthwith file in the custody of its Secretary
or an Assistant  Secretary at its principal  office and with its stock  transfer
agent, if any, an officer's  certificate showing the adjusted Exercise Price and
the adjusted  number of Shares or securities,  as the case may be, issuable upon
exercise  of each  Warrant,  determined  as herein  provided,  setting  forth in
reasonable detail the facts requiring such adjustment,  including a statement of
the number of additional shares of Common Stock, if any, and such other facts as
shall be  necessary  to show the  reason for and the  manner of  computing  such
adjustment.  Each such  officer's  certificate  shall be made  available  at all
reasonable  times  for  inspection  by the  Holder  or any  holder  of a Warrant
executed  and  delivered  pursuant  to  Paragraph  (a)  and the  Company  shall,
forthwith  after each such  adjustment,  mail, by certified mail, a copy of such
certificate to the Holder or any such holder at such holder's  address set forth
in the Company's Warrant Register.


                                      - 6 -

<PAGE>

      (h)  NOTICES  TO  WARRANT  HOLDERS.  So  long  as this  Warrant  shall  be
outstanding,  (1) if the Company shall pay any dividend or make any distribution
upon Common Stock (other than a regular  cash  dividend  payable out of retained
earnings)  or (2) if the Company  shall offer to the holders of Common Stock for
subscription  or purchase by them any share of any class or any other  rights or
(3) if  any  capital  reorganization  of the  Company,  reclassification  of the
capital  stock of the  Company,  consolidation  or merger of the Company with or
into another corporation, sale, lease or transfer of all or substantially all of
the property and assets of the Company to another  corporation,  or voluntary or
involuntary  dissolution,  liquidation  or  winding up of the  Company  shall be
effected,  then in any such  case,  the  Company  shall  cause to be  mailed  by
certified mail, return receipt  requested,  to the Holder, at least fifteen days
prior to the date specified in clauses (i) and (ii), as the case may be, of this
Paragraph (h) a notice containing a brief description of the proposed action and
stating  the date on which (i) a record is to be taken for the  purpose  of such
dividend, distribution or rights, or (ii) such reclassification, reorganization,
consolidation, merger, conveyance, lease, dissolution, liquidation or winding up
is to take place and the date, if any is to be fixed, as of which the holders of
Common  Stock  or  other   securities  shall  receive  cash  or  other  property
deliverable upon such reclassification,  reorganization,  consolidation, merger,
conveyance, dissolution, liquidation or winding up.

      (i)   RECLASSIFICATION,   REORGANIZATION   OR  MERGER.   In  case  of  any
reclassification,  capital  reorganization  or other  change of the  outstanding
shares of Common Stock of the Company, or in case of any consolidation or merger
of the  Company  with or into  another  corporation  (other than a merger with a
subsidiary in which merger the Company is the continuing  corporation  and which
does not result in any reclassification,  capital reorganization or other change
of  outstanding  shares of Common Stock of the class  issuable  upon exercise of
this Warrant) or in case of any sale, lease or conveyance to another corporation
of the property of the Company as an entirety, the Company shall, as a condition
precedent to such transaction, cause effective provisions to be made so that the
Holder shall have the right  thereafter by exercising this Warrant,  to purchase
the kind and  amount  of  shares of stock  and  other  securities  and  property
receivable upon such reclassification,  capital reorganization and other change,
consolidation, merger, sale or conveyance by a holder of the number of shares of
Common  Stock  which might have been  purchased  upon  exercise of this  Warrant
immediately prior to such reclassification,  change, consolidation, merger, sale
or conveyance.  Any such provision shall include provision for adjustments which
shall be as nearly equivalent as may be practicable to the adjustments  provided
for in this  Warrant.  The  foregoing  provisions  of this  Paragraph  (i) shall
similarly apply to successive  reclassifications,  capital  reorganizations  and
changes of shares of Common  Stock and to  successive  consolidations,  mergers,
sales or  conveyances.  In the event that in  connection  with any such  capital
reorganization or reclassification,  consolidation,  merger, sale or conveyance,
additional  shares of Common  Stock  shall be  issued in  exchange,  conversion,
substitution  or payment,  in whole in part, for a security of the Company other
than Common  Stock,  any such issue shall be treated as an issue of Common Stock
covered by the provisions of Paragraph (f) of this Warrant.

      (j)  TRANSFER  TO COMPLY  WITH THE  SECURITIES  ACT.  This  Warrant or the
Warrant  Shares or any other  security  issued or issuable upon exercise of this
Warrant may not be sold or otherwise disposed of except as follows:


                                      - 7 -

<PAGE>

            (1) To a person  who, in the  reasonable  opinion of counsel for the
Company,  is a person to whom this  Warrant  or Warrant  Shares  may  legally be
transferred  without   registration  and  without  the  delivery  of  a  current
prospectus  under the Securities Act with respect  thereto and then only against
receipt of an  agreement  of such person to comply with the  provisions  of this
Paragraph (j) with respect to any resale or other disposition of such securities
which  agreement  shall be satisfactory in form and substance to the Company and
its counsel; or

            (2) to any person upon  delivery of a  prospectus  then  meeting the
requirements  of the Securities Act relating to such securities and the offering
thereof for such sale or disposition.

Dated as of December __, 1997

                                            PORTA SYSTEMS CORP.

                                            By: ________________________


                                      - 8 -


<PAGE>

                                  PURCHASE FORM

                                  Dated:             , 19__

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________ in

            payment of the Exercise Price therefor

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________ in payment of the Exercise Price therefor by  transferring  to
      the Company for  cancellation  the  Company's  12%  Subordinated  Note due
      January 3, 2000 in the  principal  amount of  $__________ , which shall be
      applied to the  purchase  price of the Warrant as  provided  in  Paragraph
      (a)(1) of the Warrant.

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________  in payment of the  Exercise  Price  therefor  by  delivery of
      shares of Common Stock pursuant to Paragraph (a)(2) of this Warrant..

_____ The undersigned  hereby  irrevocably elects to exercise this Warrant as to
      __________  shares  subject to this  Warrant by exchange  or convert  this
      Warrant (to the extent of such number of shares) pursuant to the provision
      of Paragraph (a)(2) of this Warrant,  the number of shares of Common Stock
      being issuable as a result of such exchange or conversion to be determined
      in accordance with said Paragraph (a)(2).

                     INSTRUCTIONS FOR REGISTRATION OF SHARES

Name_____________________________________________ 
    (Please typewrite or print in block letters)

Signature________________________________________

Social Security or Employer Identification No. _____________


                                      - 9 -

<PAGE>

                                 ASSIGNMENT FORM
                                 ---------------

     FOR VALUE RECEIVED,
hereby sells, assigns and transfer unto
Name______________________________________________
     (Please typewrite or print in block letters)

Address___________________________________________

Social Security or Employer Identification No. ________________

The right to purchase  Shares  represented by this Warrant or any other security
issued or  issuable  upon  exercise  of this  Warranty  to which  such  right is
exercisable    and   does   hereby    irrevocably    constitute    and   appoint
____________________________  attorney to transfer  the same on the books of the
Company with full power of substitution.

Dated: _______________, 19__

Signature_________________________________

Signature Medallion Guaranteed:

_________________________


                                     - 10 -

<PAGE>

                                                                      Warrant to
WC-                                                                    Purchase
                                                                      **      **
                                                                        Shares

NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK  ISSUABLE  UPON  EXERCISE OF
THIS WARRANT HAVE BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933 OR ANY STATE
SECURITIES  LAWS,  AND  NEITHER  THIS  WARRANT  NOR  SUCH  SHARES  MAY BE  SOLD,
ENCUMBERED OR OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
STATEMENT UNDER SUCH ACTS OR AN EXEMPTION FROM SUCH  REGISTRATION  REQUIREMENTS,
AND, IF AN EXEMPTION  SHALL BE  APPLICABLE,  THE HOLDER SHALL HAVE  DELIVERED AN
OPINION OF COUNSEL  ACCEPTABLE  TO THE  COMPANY  THAT SUCH  REGISTRATION  IS NOT
REQUIRED.

          Void after 5:00 P.M. New York City time on December 31, 2003

                     SERIES C COMMON STOCK PURCHASE WARRANT
                                       OF
                               PORTA SYSTEMS CORP.

      This is to  certify  that,  FOR  VALUE  RECEIVED,  __________  or  assigns
("Holder"), is entitled to purchase,  subject to the provisions of this Warrant,
from Porta Systems Corp., a Delaware corporation (the "Company"), at an exercise
price of (1) ($______) per share,  subject to  adjustment  as  provided  in this
Warrant (the "Exercise Price"), ________________________ thousand ( ,000) shares
of the Company's  common stock, par value $.01 per share ("Common Stock") at any
time during the period (the  "Exercise  Period"),  as hereinafter  defined.  The
Exercise Period shall mean the period commencing on the date of issuance of this
Warrant  and ending on at 5:00 P.M.  New York City time on  December  31,  2003;
provided,  however,  that if such date is a day on which banking institutions in
the  State  of New  York  are  authorized  by law to  close,  then  on the  next
succeeding  day which  shall not be such a day.  The  securities  issuable  upon
exercise of this Warrant and the price to be paid for such  securities  may also
be adjusted from time to time as hereinafter set forth. Reference in the Warrant
to the "Series C Warrants" or the "Warrants" shall mean any or all of the Series
C Common Stock  Purchase  Warrants  issued by the Company.  The shares of Common
Stock  issuable  upon  exercise of this  Warrant are referred to as the "Warrant
Shares."

      (a) EXERCISE OF WARRANT.

            (1) This  Warrant may be  exercised  in whole at any time or in part
from time to time  during the  Exercise  Period by  presentation  and  surrender
hereof to the  Company at its  principal  office,  or at the office of its stock
transfer agent, if any, with the Purchase Form annexed

- --------
(1)   If the Series C Warrant is issued the exercise  price shall  determined in
      accordance with Paragraph 3 of the Subscription Agreement.


<PAGE>

hereto duly executed and  accompanied  by payment of the Exercise  Price for the
number of Warrant  Shares  specified  in such form.  If this  Warrant  should be
exercised in part only,  the Company  shall,  upon surrender of this Warrant for
cancellation,  execute and deliver a new  Warrant  evidencing  the rights of the
Holder  hereof  to  purchase  the  balance  of the  Warrant  Shares  purchasable
hereunder.  Upon receipt by the Company of this Warrant at its office, or by the
stock transfer agent of the Company at its office,  in proper form for exercise,
the  Holder  shall be deemed to be the  holder of record of the  Warrant  Shares
issuable upon such  exercise,  notwithstanding  that the stock transfer books of
the Company shall then be closed or that certificates  representing such Warrant
Shares  shall not then be  actually  delivered  to the  Holder.  Payment  of the
Exercise  Price of this  Warrant may also be made by the  application,  first of
accrued interest and then principal of the Company's 12% Subordinated  Notes due
January 3, 2000,  by tendering  such notes for  cancellation  (to the extent set
forth in the Purchase  Form).  To the extent that the entire  principal  balance
plus accrued  interest on such note is not applied to exercise of this  Warrant,
the Company  shall issue to the Holder a new note for the  remaining  balance of
the principal amount of such note.

            (2) If,  at any  time  subsequent  to the one  hundred  sixty  fifth
(165th) day following the Issue Date, as hereinafter defined, the Warrant Shares
are not covered by an effective  registration statement under the Securities Act
of 1933, as amended (the "Securities  Act"), and only for so long as the Warrant
Shares are not covered by such an effective registration  statement,  the Holder
of this Warrant shall have the cashless exercise right as set forth in Paragraph
(a)(3) of this Warrant.

            (3) The cashless exercise right shall mean the right to either:

                  (A) exchange or convert this  Warrant,  in whole or in part to
the extent that this Warrant has not previously been  exercised,  for the number
of shares of Common Stock determined by (i) multiplying (x) the number of shares
as to which this Warrant is being  exercised by (y) the  difference  between the
current  value  per  share of Common  Stock as of the date of  exercise  and the
Exercise  Price per share,  as in effect on such  date,  and (ii)  dividing  the
result so obtained by the current value per share of Common Stock as of the date
of exercise; or

                  (B) exercise this Warrant, in whole or in part, by delivery of
such  number  of shares of  Common  Stock as has a  current  value  equal to the
Exercise Price.

            (4) The date of exercise  shall mean the date on which this  Warrant
accompanied by the notice of exercise is received by the Company or its transfer
agent.

            (5) The current  value per share of Common Stock shall be determined
as follows:

                  (A) If the  Common  Stock is listed on a  national  securities
exchange or admitted to unlisted  trading  privileges on such exchange or listed
for trading on the Nasdaq Stock Market  ("Nasdaq") or other automated  quotation
system which provides  information as to the last sale price,  the current value
shall be the  average of the  reported  last sale  prices of one share of Common
Stock on such  exchange or system on the last five (5) trading days prior to the
date of exercise of this Warrant,  or if, on any of such dates,  no such sale is
made on such day, the


                                      - 2 -

<PAGE>

average of the  closing bid and asked  prices for such date on such  exchange or
system shall be used; or

                  (B) If the  Common  Stock  is not so  listed  or  admitted  to
unlisted trading privileges,  the current value shall be the mean the average of
the reported  last bid and asked prices of one share of Common Stock as reported
by Nasdaq,  the  National  Quotation  Bureau,  Inc. or other  similar  reporting
service,  on the last five (5) trading day prior to the date of the  exercise of
this Warrant; or

                  (C) If the  Common  Stock  is not so  listed  or  admitted  to
unlisted  trading  privileges and bid and asked prices are not so reported,  the
current  value of one share of Common  Stock  shall be an amount,  not less than
book value,  determined  in such  reasonable  manner as may be prescribed by the
Board of Directors of the Company.

      (b)  RESERVATION  OF SHARES.  The Company  hereby agrees that at all times
there shall be reserved  for  issuance  and/or  delivery  upon  exercise of this
Warrant  such number of shares of Common Stock as shall be required for issuance
and delivery  upon  exercise of this Warrant and that it shall not,  without the
prior  approval of the holders of a majority of the Warrants  then  outstanding,
increase the par value of the Common Stock.

      (c) FRACTIONAL  SECURITIES.  No fractional  shares or script  representing
fractional  shares  shall be issued  upon the  exercise  of this  Warrant.  With
respect to any fraction of a share called for upon any exercise of this Warrant,
the  Company  shall pay to the Holder an amount in cash  equal to such  fraction
multiplied  by the current  value of such  fractional  share,  determined in the
manner set forth in Paragraph  (a)(5) of this  Warrant,  except that the current
value  shall mean the closing  price on the last  trading day before the date of
exercise.

      (d) EXCHANGE,  TRANSFER,  ASSIGNMENT  OR LOSS OF WARRANT.  This Warrant is
exchangeable,  without expense,  at the option of the Holder,  upon presentation
and  surrender  hereof to the  Company  or at the  office of its stock  transfer
agent,  if any, for other  Warrants of  different  denominations  entitling  the
holder  thereof to purchase in the aggregate the same number of shares of Common
Stock purchasable hereunder.  Subject to the provisions of Paragraph (j) of this
Warrant,  upon  surrender of this Warrant to the Company or at the office of its
stock  transfer  agent,  if any, with the  Assignment  Form annexed  hereto duly
executed  and funds  sufficient  to pay any  transfer  tax,  the Company  shall,
without  charge,  execute and deliver a new Warrant in the name of the  assignee
named in such  instrument  of  assignment  and this  Warrant  shall  promptly be
canceled.  This  Warrant may be divided or combined  with other  Warrants  which
carry the same rights upon  presentation  hereof at the office of the Company or
at the  office of its stock  transfer  agent,  if any,  together  with a written
notice  specifying the names and  denominations  in which new Warrants are to be
issued  and signed by the  Holder  hereof.  The term  "Warrant"  as used  herein
includes any Warrants into which this Warrant may be divided or exchanged.  Upon
receipt  by the  Company  of  evidence  satisfactory  to it of the loss,  theft,
destruction  or mutilation of this Warrant,  and (in the case of loss,  theft or
destruction) of reasonably satisfactory indemnification,  and upon surrender and
cancellation of this Warrant, if mutilated, the Company will execute and deliver
a new Warrant of like tenor.  Any such new Warrant  executed and delivered shall
constitute an


                                      - 3 -

<PAGE>

additional  contractual  obligation  on the part of the Company,  whether or not
this  Warrant so lost,  stolen,  destroyed,  or  mutilated  shall be at any time
enforceable by anyone.

      (e) RIGHTS OF THE HOLDER. The Holder shall not, by virtue of this Warrant,
be  entitled to any rights of a  stockholder  in the  Company,  either at law or
equity,  and the  rights of the Holder are  limited  to those  expressed  in the
Warrant and are not  enforceable  against  the Company  except to the extent set
forth herein.

      (f) ANTI-DILUTION PROVISIONS. The Exercise Price in effect at any time and
the number and kind of  securities  purchasable  upon  exercise of each  Warrant
shall be subject to adjustment as follows:

            (1) If the Company shall,  subsequent to the first date on which the
Company  shall have  issued a Series C Warrant  (the  "Issue  Date"),  (A) pay a
dividend  or make a  distribution  on its  shares of  Common  Stock in shares of
Common Stock,  (B) subdivide or reclassify its  outstanding  Common Stock into a
greater number of shares,  or (C) combine or reclassify its  outstanding  Common
Stock into a smaller number of shares or otherwise  effect a reverse split,  the
Exercise  Price in effect at the time of the record  date for such  dividend  or
distribution  or of the  effective  date of  such  subdivision,  combination  or
reclassification  shall be  proportionately  adjusted so that the Holder of this
Warrant  exercised  after such date shall be entitled  to receive the  aggregate
number and kind of shares which, if this Warrant had been exercised  immediately
prior to such time,  he would have owned upon such exercise and been entitled to
receive upon such dividend, subdivision,  combination or reclassification.  Such
adjustment  shall  be  made  successively  whenever  any  event  listed  in this
Paragraph (f)(1) shall occur.

            (2) In case the Company shall,  subsequent to the Issue Date,  issue
rights  or  warrants  to all  holders  of its  Common  Stock  entitling  them to
subscribe for or purchase shares of Common Stock (or securities convertible into
Common Stock) at a price (or having a conversion  price per share) less than the
current market price of the Common Stock (as defined in Paragraph (f)(5) of this
Warrant)  on the record  date  mentioned  below,  the  Exercise  Price  shall be
adjusted  so that the  Exercise  Price  shall  equal  the  price  determined  by
multiplying the Exercise Price in effect  immediately  prior to the date of such
issuance by a fraction,  the numerator of which shall be the number of shares of
Common Stock  outstanding on the record date mentioned  below plus the number of
additional  shares of Common  Stock which the  aggregate  offering  price of the
total number of shares of Common Stock so offered (or the  aggregate  conversion
price of the  convertible  securities so offered) would purchase at such current
market price per share of the Common Stock,  and the  denominator of which shall
be the number of shares of Common Stock outstanding on such record date plus the
number  of  additional  shares of  Common  Stock  offered  for  subscription  or
purchased (or into which the convertible securities so offered are convertible).
Such adjustment shall be made successively  whenever such rights or warrants are
issued and shall  become  effective  immediately  after the record  date for the
determination of stockholders  entitled to receive such rights or warrants;  and
to the extent that shares of Common Stock or securities  convertible into Common
Stock are not delivered  after the  expiration  of such rights or warrants,  the
Exercise  Price shall be readjusted to the Exercise Price which would then be in
effect had the  adjustments  made upon the  issuance  of such rights or warrants
been made upon


                                      - 4 -

<PAGE>

the  basis of  delivery  of only the  number  of  shares  of  Common  Stock  (or
securities convertible into Common Stock) actually delivered.

            (3) In  case  the  Company  shall,  subsequent  to the  Issue  Date,
distribute  to all holders of Common  Stock  evidences  of its  indebtedness  or
assets  (excluding cash dividends or distributions  paid out of current earnings
and dividends or distributions  referred to in Paragraph (f)(1) of this Warrant)
or  subscription  rights or warrants  (excluding  those referred to in Paragraph
(f)(2) of this  Warrant),  then in each such case the  Exercise  Price in effect
thereafter  shall be  determined  by  multiplying  the Exercise  Price in effect
immediately  prior thereto by a fraction,  of which the  numerator  shall be the
total number of shares of Common  Stock  outstanding  multiplied  by the current
market price per share of Common  Stock (as defined in Paragraph  (f)(5) of this
Warrant),  less the fair market value (as  determined by the Company's  Board of
Directors) of said assets or evidences of indebtedness so distributed or of such
rights or warrants,  and of which the  denominator  shall be the total number of
shares of Common Stock  outstanding  multiplied by such current market price per
share of Common Stock. Such adjustment shall be made successively  whenever such
a  record  date is  fixed.  Such  adjustment  shall  be made  whenever  any such
distribution  is made and shall become  effective  immediately  after the record
date  for  the   determination   of   stockholders   entitled  to  receive  such
distribution.

            (4)  Whenever  the  Exercise  Price  payable  upon  exercise of each
Warrant is adjusted pursuant to Paragraphs  (f)(1),  (2) or (3) of this Warrant,
the number of shares of Common Stock  purchasable  upon exercise of each Warrant
shall  simultaneously  be adjusted by multiplying the number of shares of Common
Stock  issuable  upon  exercise of each Warrant in effect on the date thereof by
the  Exercise  Price in effect on the date  thereof and  dividing the product so
obtained by the  Exercise  Price,  as  adjusted.  In no event shall the Exercise
Price per share be less than the par value per  share,  and,  if any  adjustment
made pursuant to Paragraph (f)(1),  (2) or (3) would result in an exercise price
of less than the par value per share,  then, in such event,  the Exercise  Price
per share shall be the par value per share.

            (5) For the purpose of any computation  under Paragraphs  (f)(2) and
(3) of this Warrant,  the current  market price per share of Common Stock at any
date shall be deemed to be the average of the daily closing  prices for ten (10)
consecutive  trading days commencing  twenty (20) trading days before such date.
The closing price for each day shall be the reported last sale price regular way
or, in case no such  reported  sale takes place on such day,  the average of the
reported last bid and asked prices  regular way, in either case on the principal
national securities exchange on which the Common Stock is admitted to trading or
listed on Nasdaq,  or if not listed or admitted  to trading on such  exchange or
such System,  the average of the reported  highest bid and reported lowest asked
prices as reported  by Nasdaq,  the  National  Quotation  Bureau,  Inc. or other
similar  organization if Nasdaq is no longer reporting such  information,  or if
not so available, the fair market price as determined by the Board of Directors.

            (6) No  adjustment  in the Exercise  Price shall be required  unless
such  adjustment  would  require an  increase  or  decrease of at least one cent
($0.01) in such price;  provided,  however, that any adjustments which by reason
of this  Paragraph  (f)(6) are not required to be made shall be carried  forward
and taken into account in any subsequent adjustment. All calculations under this
Paragraph (f) shall be made to the nearest cent or to the nearest


                                      - 5 -

<PAGE>

one-hundredth  of a share, as the case may be. Anything in this Paragraph (f) to
the contrary  notwithstanding,  the Company shall be entitled,  but shall not be
required,  to make such  changes in the  Exercise  Price,  in  addition to those
required by this Paragraph (f), as it in its  discretion  shall  determine to be
advisable in order that any dividend or  distribution in shares of Common Stock,
subdivision,  reclassification  or  combination  of Common  Stock,  issuance  of
warrants to purchase  Common Stock or  distribution of evidences of indebtedness
or other assets  (excluding  cash  dividends)  referred to  hereinabove  in this
Paragraph (f)  hereafter  made by the Company to the holders of its Common Stock
shall not result in any tax to the  holders of its  Common  Stock or  securities
convertible into Common Stock.

            (7) The Company may retain a firm of independent  public accountants
of  recognized  standing  selected  by the  Board of  Directors  (who may be the
regular accountants employed by the Company) to make any computation required by
this  Paragraph  (f), and a certificate  signed by such firm shall be conclusive
evidence of the correctness of such adjustment.

            (8) In the event that at any time, as a result of an adjustment made
pursuant  to  Paragraph  (f)(1)  of this  Warrant,  the  Holder  of any  Warrant
thereafter  shall become  entitled to receive any shares of the  Company,  other
than Common Stock, thereafter the number of such other shares so receivable upon
exercise of any Warrant  shall be subject to  adjustment  from time to time in a
manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in Paragraphs (f)(1) to (6), inclusive, of
this Warrant.

            (9)  Irrespective  of any  adjustments  in the Exercise Price or the
number  or kind of  shares  purchasable  upon  exercise  of  Warrants,  Warrants
theretofore  or  thereafter  issued may  continue  to express the same price and
number and kind of shares as are stated in this and similar  Warrants  initially
issued by the Company.

            (10) In the  event  that at any time,  as a result of an  adjustment
made  pursuant to Paragraph  (f)(1) of this  Warrant,  the Holder of any Warrant
thereafter  shall become  entitled to receive any shares of the  Company,  other
than Common Stock, thereafter the number of such other shares so receivable upon
exercise of any Warrant  shall be subject to  adjustment  from time to time in a
manner and on terms as nearly  equivalent as practicable to the provisions  with
respect to the Common Stock contained in Paragraphs (f)(1) to (8), inclusive, of
this Warrant.

      (g) OFFICER'S  CERTIFICATE.  Whenever the Exercise Price shall be adjusted
as required by the provisions of Paragraph (f) of this Warrant subsequent to the
Effective Date, the Company shall forthwith file in the custody of its Secretary
or an Assistant  Secretary at its principal  office and with its stock  transfer
agent, if any, an officer's  certificate showing the adjusted Exercise Price and
the adjusted  number of Shares or securities,  as the case may be, issuable upon
exercise  of each  Warrant,  determined  as herein  provided,  setting  forth in
reasonable detail the facts requiring such adjustment,  including a statement of
the number of additional shares of Common Stock, if any, and such other facts as
shall be  necessary  to show the  reason for and the  manner of  computing  such
adjustment.  Each such  officer's  certificate  shall be made  available  at all
reasonable  times  for  inspection  by the  Holder  or any  holder  of a Warrant
executed  and  delivered  pursuant  to  Paragraph  (a)  and the  Company  shall,
forthwith after each such adjustment,


                                      - 6 -

<PAGE>

mail, by certified  mail, a copy of such  certificate  to the Holder or any such
holder at such holder's address set forth in the Company's Warrant Register.

      (h)  NOTICES  TO  WARRANT  HOLDERS.  So  long  as this  Warrant  shall  be
outstanding,  (1) if the Company shall pay any dividend or make any distribution
upon Common Stock (other than a regular  cash  dividend  payable out of retained
earnings)  or (2) if the Company  shall offer to the holders of Common Stock for
subscription  or purchase by them any share of any class or any other  rights or
(3) if  any  capital  reorganization  of the  Company,  reclassification  of the
capital  stock of the  Company,  consolidation  or merger of the Company with or
into another corporation, sale, lease or transfer of all or substantially all of
the property and assets of the Company to another  corporation,  or voluntary or
involuntary  dissolution,  liquidation  or  winding up of the  Company  shall be
effected,  then in any such  case,  the  Company  shall  cause to be  mailed  by
certified mail, return receipt  requested,  to the Holder, at least fifteen days
prior to the date specified in clauses (i) and (ii), as the case may be, of this
Paragraph (h) a notice containing a brief description of the proposed action and
stating  the date on which (i) a record is to be taken for the  purpose  of such
dividend, distribution or rights, or (ii) such reclassification, reorganization,
consolidation, merger, conveyance, lease, dissolution, liquidation or winding up
is to take place and the date, if any is to be fixed, as of which the holders of
Common  Stock  or  other   securities  shall  receive  cash  or  other  property
deliverable upon such reclassification,  reorganization,  consolidation, merger,
conveyance, dissolution, liquidation or winding up.

      (i)   RECLASSIFICATION,   REORGANIZATION   OR  MERGER.   In  case  of  any
reclassification,  capital  reorganization  or other  change of the  outstanding
shares of Common Stock of the Company, or in case of any consolidation or merger
of the  Company  with or into  another  corporation  (other than a merger with a
subsidiary in which merger the Company is the continuing  corporation  and which
does not result in any reclassification,  capital reorganization or other change
of  outstanding  shares of Common Stock of the class  issuable  upon exercise of
this Warrant) or in case of any sale, lease or conveyance to another corporation
of the property of the Company as an entirety, the Company shall, as a condition
precedent to such transaction, cause effective provisions to be made so that the
Holder shall have the right  thereafter by exercising this Warrant,  to purchase
the kind and  amount  of  shares of stock  and  other  securities  and  property
receivable upon such reclassification,  capital reorganization and other change,
consolidation, merger, sale or conveyance by a holder of the number of shares of
Common  Stock  which might have been  purchased  upon  exercise of this  Warrant
immediately prior to such reclassification,  change, consolidation, merger, sale
or conveyance.  Any such provision shall include provision for adjustments which
shall be as nearly equivalent as may be practicable to the adjustments  provided
for in this  Warrant.  The  foregoing  provisions  of this  Paragraph  (i) shall
similarly apply to successive  reclassifications,  capital  reorganizations  and
changes of shares of Common  Stock and to  successive  consolidations,  mergers,
sales or  conveyances.  In the event that in  connection  with any such  capital
reorganization or reclassification,  consolidation,  merger, sale or conveyance,
additional  shares of Common  Stock  shall be  issued in  exchange,  conversion,
substitution  or payment,  in whole in part, for a security of the Company other
than Common  Stock,  any such issue shall be treated as an issue of Common Stock
covered by the provisions of Paragraph (f) of this Warrant.


                                      - 7 -

<PAGE>

      (j)  TRANSFER  TO COMPLY  WITH THE  SECURITIES  ACT.  This  Warrant or the
Warrant  Shares or any other  security  issued or issuable upon exercise of this
Warrant may not be sold or otherwise disposed of except as follows:

            (1) To a person  who, in the  reasonable  opinion of counsel for the
Company,  is a person to whom this  Warrant  or Warrant  Shares  may  legally be
transferred  without   registration  and  without  the  delivery  of  a  current
prospectus  under the Securities Act with respect  thereto and then only against
receipt of an  agreement  of such person to comply with the  provisions  of this
Paragraph (j) with respect to any resale or other disposition of such securities
which  agreement  shall be satisfactory in form and substance to the Company and
its counsel; or

            (2) to any person upon  delivery of a  prospectus  then  meeting the
requirements  of the Securities Act relating to such securities and the offering
thereof for such sale or disposition.

Dated as of              , 199_

                                            PORTA SYSTEMS CORP.

                                            By: ________________________


                                      - 8 -

<PAGE>

                                  PURCHASE FORM
                                  -------------

                                  Dated:               , 19__

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________ in payment of the Exercise Price therefor

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________ in payment of the Exercise Price therefor by  transferring  to
      the Company for  cancellation  the  Company's  12%  Subordinated  Note due
      January 3, 2000 in the  principal  amount of  $__________,  which shall be
      applied to the  purchase  price of the Warrant as  provided  in  Paragraph
      (a)(1) of the Warrant.

_____ The undersigned hereby irrevocably exercises this Warrant to the extent of
      purchasing  __________  shares of Common Stock and hereby makes payment of
      $__________  in payment of the  Exercise  Price  therefor  by  delivery of
      shares of Common Stock pursuant to Paragraph (a)(2) of this Warrant..

_____ The undersigned  hereby  irrevocably elects to exercise this Warrant as to
      __________  shares  subject to this  Warrant by exchange  or convert  this
      Warrant (to the extent of such number of shares) pursuant to the provision
      of Paragraph (a)(2) of this Warrant,  the number of shares of Common Stock
      being issuable as a result of such exchange or conversion to be determined
      in accordance with said Paragraph (a)(2).

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

                     INSTRUCTIONS FOR REGISTRATION OF SHARES

Name _____________________________________________
     (Please typewrite or print in block letters)

Signature ________________________________________

Social Security or Employer Identification No. ____________


                                      - 9 -

<PAGE>

                                 ASSIGNMENT FORM

     FOR VALUE RECEIVED,
hereby sells, assigns and transfer unto
Name ______________________________________________
      (Please typewrite or print in block letters)

Address ___________________________________________

Social Security or Employer Identification No. ______________

The right to purchase  Shares  represented by this Warrant or any other security
issued or  issuable  upon  exercise  of this  Warranty  to which  such  right is
exercisable    and   does   hereby    irrevocably    constitute    and   appoint
_____________________  attorney to transfer the same on the books of the Company
with full power of substitution.

Dated: _________________, 19__

Signature ___________________________

Signature Medallion Guaranteed:

__________________________


                                     - 10 -




                               Porta Systems Corp.
                               575 Underhill Blvd.
                             Syosset, New York 11791

                                January 26, 1998

Henley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Company, Inc.
c/o Smith Management Company, Inc.
885 Third Avenue, 34th floor
New York, New York 10022

            Re:   Porta Systems Corp. 6% Convertible Subordinated Debentures Due
                  July 1, 2002
                  --------------------------------------------------------------

Gentlemen:

      This  Agreement  will set forth the terms  pursuant to which Henley Group,
Ltd., Woodstead  Associates,  L.P. and Lake Trust  (collectively,  "Holders" and
each,  individually,  a  "Holder")  will  exchange 6%  Convertible  Subordinated
Debentures  Due July 1, 2002  ("Debentures")  of Porta Systems Corp., a Delaware
corporation (the "Company"), for shares of the Company's common stock, par value
$.01 per share ("Common Stock").

      1. Each Holder  represents  and warrants that (a) the Holders are the sole
beneficial  owners of Debentures  (the "Exchange  Debentures")  in the aggregate
principal  amount  of one  million  two  hundred  sixty  thousand  U.S.  dollars
(US$1,260,000),  with  each  Holder  being  the  sole  beneficial  owner  of the
principal  amount of  Debentures  set forth after such  Holder's  name under the
heading  "Principal  Amount" in Exhibit A to this  Agreement,  (b) the  Exchange
Debentures are not subject to any pledge, lien, hypothecation or any encumbrance
and (c) the Holders have the right to enter into this  Agreement  and effect the
exchange provided for in this Agreement.

      2.  Holders  agree,  within ten (10)  business  days from the date of this
Agreement, to exchange the Exchange Debentures for an aggregate of three hundred
thirty  thousand  three  hundred  seventy two  (330,372)  shares (the  "Exchange
Shares") of Common Stock.  The number of Exchange  Shares issuable in respect of
the Exchange  Debentures  owned by each Holder is set forth after such  Holder's
name  under the  heading  "Exchange  Shares"  in  Exhibit  A to this  Agreement.
Delivery of the  Exchange  Debentures  shall be made to the  Company's  transfer
agent,  American  Stock  Transfer & Trust  Company  ("AST&T").  The Company will
instruct  AST&T to issue the  Exchange  Shares  in the name of Smith  Management
Company,  Inc. ("Smith") and deliver the certificates for the Exchange Shares to
Smith at its address set forth at the beginning of this Agreement. In exchanging
the Exchange  Debentures  for the Exchange  Shares,  the Holders are waiving any
rights they have or may have to interest on the Exchange Debentures.

<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 2


      3.  Holders  jointly and  severally  represent  and warrant  that (a) each
Holder  is an  accredited  investor  within  the  meaning  of  Rule  501  of the
Securities and Exchange  Commission (the "Commission" ) under the Securities Act
of 1933,  as amended (the  "Securities  Act"),  (b) each Holder is acquiring the
Exchange  Shares for its own account for  investment  and not with a view to the
sale or distribution  thereof, (c) all corporate or partnership action necessary
for each Holder to execute this  Agreement has been taken and (d) this Agreement
constitutes the valid,  binding and enforceable  obligation of each Holder. Each
Holder and Smith  understand that the certificates for the Exchange Shares shall
bear the Company's  standard  investment  legend.  Smith agrees that it will not
transfer  the  Exchange  Shares  except  pursuant to an  effective  registration
statement or an exemption from the  registration  requirements of the Securities
Act and  applicable  state law, in which event Smith will deliver to the Company
an opinion of counsel as to the availability of such exemption, such opinion and
such counsel to be reasonably acceptable to the Company.

      4.  Each  Holder   represents  and  warrants  that  its  Federal  taxpayer
identification number is as set forth after such Holder's name under the heading
"Tax ID  Number"  on  Exhibit A to this  Agreement,  and at the  request  of the
Company,  will  execute  and  deliver  to the  Company a Form W-8 or W-9 to such
effect.

      5. The Company  represents  and  warrants  that (a) all  corporate  action
necessary for the execution of this Agreement by the Company and the performance
by the Company of its terms has been taken,  (b) this Agreement  constitutes the
valid,  binding and  enforceable  obligation of the Company and (c) the Exchange
Shares,  when  issued  pursuant  to this  Agreement,  will be duly  and  validly
authorized and issued, fully paid and nonassessable.

      6. (a) The Company agrees that it will include the Exchange  Shares in the
next registration  statement filed by the Company with the Commission,  and that
it will file such  registration  statement  with the  Commission  not later than
April 30, 1998. The Company agrees that it will keep the registration  statement
covering  the  Exchange  Shares  effective  for  such  time as the  registration
statement is otherwise being kept effective; provided, however, that the Company
shall  not be  required  to  either  file or  keep  the  registration  statement
effective as to the  Exchange  Shares  subsequent  to two years from the date of
this  Agreement.  It shall be a condition to the  obligations  of the Company to
include  the  Exchange  Shares in any  registration  statement  that Smith shall
provide the Company in a timely manner with such  information as the Company may
request  in  connection  with the  registration  statement,  including,  but not
limited to, information  concerning Smith, any underwriter  engaged by Smith and
the  proposed  manner  of  distribution  of the  registered  securities  and any
specific information  requested by the Commission,  any stock exchange or market
or the National Association of Securities Dealers, Inc.


<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 3


            (b) The following provision shall also be applicable:

                  (i)  Following  the   effective   date  of  the   registration
statement,  the Company shall, upon the request of Smith, forthwith supply Smith
with such number of prospectuses  meeting the requirements of the Securities Act
as Smith shall reasonably request to permit Smith to make a public  distribution
of the Exchange  Shares from time to time.  The Company  shall also use its best
efforts to qualify the Exchange Shares for sale in such states as the Company is
qualifying the other securities  being  registered  pursuant to the registration
statement as Smith may reasonably request.

                  (ii) The Company shall bear the entire cost and expense of the
preparation and filing of the registration  statement pursuant to this Paragraph
6. Smith shall,  however,  bear the fees of its own counsel and  accountants and
any transfer taxes or  underwriting  discounts or commissions  applicable to the
Exchange Shares being sold by Smith pursuant thereto.

                  (iii) The Company shall  indemnify and hold harmless Smith and
each  underwriter,  within the meaning of the  Securities  Act, who may purchase
from or sell any Exchange  Shares for Smith from and against any and all losses,
claims, damages and liabilities caused by any untrue statement or alleged untrue
statement of a material fact contained in any  registration  statement under the
Securities  Act or any  prospectus  included  therein  required  to be  filed or
furnished by reason of this Paragraph 6 or any application or other filing under
any state  securities  law caused by any omission or alleged  omissions to state
therein a material fact  required to be stated  therein or necessary to make the
statements  therein not  misleading to which Smith or any such  underwriter  may
become  subject under the  Securities  Act, the Exchange Act or other Federal or
state statutory law or regulation, at common law or otherwise, except insofar as
such  losses,  claims,  damages or  liabilities  are  caused by any such  untrue
statement or alleged untrue statement or omission or alleged omission based upon
information furnished or required to be furnished to the Company by Smith or any
underwriter expressly for use therein,  which indemnification shall include each
person,  if any,  who controls  any such  underwriter  within the meaning of the
Securities Act; provided,  however, that Smith and any such underwriter shall at
the same time  indemnify the Company,  its directors,  each officer  signing the
registration statement, each person, if any, who controls the Company within the
meaning of the Securities Act and each other person (the "other holders"), whose
securities  are being offered or sold pursuant to such  registration  statement,
from and against any and all losses,  claims,  damages and liabilities caused by
any untrue statement or alleged untrue statement of a material fact contained in
any registration  statement or any prospectus  required to be filed or furnished
by reason of this  Paragraph 6 or caused by any omission or alleged  omission to
state therein a material fact required to be stated therein or necessary to make
the statements therein not

<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 4


misleading, insofar as such losses, claims, damages or liabilities are caused by
any untrue  statement or alleged untrue statement or omission based upon written
information  furnished to the Company by Smith or any such underwriter expressly
for use therein.

                  (iv) If any action or claim  shall be brought or asserted by a
person  entitled  to  indemnification   pursuant  to  Paragraph  6(b)(iii)  this
Agreement  (an  "indemnified  party")  against  the  Company or any  underwriter
engaged by the Company or any person controlling the Company or such underwriter
or against Smith or any underwriter  engaged by Smith or any person  controlling
Smith or such underwriter,  in respect of which indemnity may be sought pursuant
to said Paragraph  6(b)(iii) (an  "indemnifying  party"),  the indemnified party
shall promptly notify the  indemnifying  party in writing,  and the indemnifying
party shall assume the defense  thereof,  including  the  employment  of counsel
reasonably  satisfactory to the  indemnified  party and the payment of all legal
and  other  expenses.  The  failure  of the  indemnified  party  to  notify  the
indemnifying  party will not relieve the indemnifying party of any liability for
indemnification  which it may have to the indemnified  party other than pursuant
to Paragraph  6(b)(iii) of this Agreement.  The indemnified party shall have the
right to employ  separate  counsel in any such action and to  participate in the
defense  thereof,  but the fees and  expenses  of such  counsel  shall be at the
expense of the  indemnified  party  unless (A) the  employment  thereof has been
specifically  authorized  by the  indemnifying  party  in  writing,  or (B)  the
indemnifying  party has  failed to assume  the  defense  and  employ  counsel as
provided in this Paragraph 6(b)(iv), or (C) the named parties to any such action
(including  any  impleaded  parties)  include both an  indemnified  party and an
indemnifying  party,  and in the  judgment of the  counsel for the  indemnifying
party,  it is advisable for the  indemnified  party or controlling  person to be
represented by separate counsel (in which case the indemnifying  party shall not
have the right to assume the defense of such action on behalf of the indemnified
party or such  controlling  person),  it  being  understood,  however,  that the
indemnifying party shall, in connection with any one such action or separate but
substantially  similar  or  related  actions  arising  out of the  same  general
allegations or circumstances,  be liable for the reasonable fees and expenses of
only one separate  firm of attorneys  at any time in each  jurisdiction  for all
indemnified  parties (whether pursuant to this Agreement or any other agreements
granting  registration  rights),  which firm shall be designated in writing by a
majority  of the  indemnified  parties  (based on the  number  of  shares  being
registered by the  indemnified  parties if the  indemnified  parties are selling
stockholders),  except that if the indemnified parties include the Company,  the
Company shall designate counsel.  The indemnifying party shall not be liable for
any settlement of any such action  effected by an indemnified  party without the
written  consent  of  the  indemnifying  party  (which  shall  not  be  withheld
unreasonably in light of all factors of importance to such  indemnified  party),
but if settled with such  written  consent,  or if there be a final  judgment or
decree for the plaintiff in any such action by a court of competent jurisdiction
and the time to appeal  shall have  expired or the last  appeal  shall have been
denied, the indemnifying

<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 5


party  agrees to indemnify  and hold  harmless  the  indemnified  party from and
against any loss or liability by reason of such settlement or judgment.

                  (v) Smith shall not engage an underwriter  for the sale of the
Exchange Shares without the prior consent of the Company.

      7. All notices  provided for in this Agreement  shall be in writing signed
by the party giving such notice,  and delivered  personally or sent by overnight
courier or messenger  against receipt thereof or sent by registered or certified
mail,  return receipt  requested or by telecopier of receipt of  transmission is
confirmed or if  transmission is confirmed by mail as provided in this Paragraph
7.  Notices  shall be  deemed  to have  been  received  on the date of  personal
delivery or telecopy or, if sent by certified or registered mail, return receipt
requested, shall be deemed to be delivered on the fifth (5th) business day after
the date of mailing.  Notices  shall be sent to the parties at their  respective
addresses set forth at the beginning of this Agreement or, if by telecopier,  to
the Company at (516) 682-4655 or to Holders or Smith at (212)  751-9502.  Notice
to the Company should be sent to the attention of Mr. Edward B. Kornfeld, Senior
Vice  President  and Chief  Financial  Officer and notice to any Holder or Smith
should be sent to the attention of David A. Persing, Esq., Senior Vice President
- --  General  Counsel.  Any party may change the  address,  telecopier  number of
person to whom notice  should be given by notice in the manner  provided in this
Paragraph 7.

      8. (a) This Agreement constitutes the entire agreement of the parties with
respect to its subject matter,  superseding and terminating any and all prior or
contemporaneous  oral and prior written agreements,  understandings,  letters of
intent, representations and warranties between or among the parties with respect
to the  subject  matter  of this  Agreement.  No part of this  Agreement  may be
modified or amended, nor may any right be waived, except by a written instrument
which expressly  refers to this  Agreement,  states that it is a modification or
amendment  of this  Agreement  or a waiver and is signed by the  parties to this
Agreement,  or, in the case of waiver,  by the party  granting  the  waiver.  No
course  of  conduct  or  dealing  or trade  usage or  custom  and no  course  of
performance  shall be  relied  on or  referred  to by any  party to  contradict,
explain or supplement any provision of this Agreement,  it being acknowledged by
the parties to this Agreement that this Agreement is intended to be, and is, the
complete and exclusive  statement of the  agreement  with respect to its subject
matter.  Any waiver shall be limited to the express  terms thereof and shall not
be construed as a waiver of any other  provisions or the same  provisions at any
other time or under any other circumstances.

            (b) This Agreement  shall be governed by and construed in accordance
with the laws of the State of New York  applicable  to contracts  made and to be
performed entirely within

<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 6


such State. Each party hereby (i) irrevocably consents and agrees that any legal
or equitable  action or  proceeding  arising  under or in  connection  with this
Agreement or any document or instrument delivered with respect to this Agreement
and/or the Units shall be brought  exclusively  in any Federal or state court in
the County of New York,  State of New  York,(ii)  agrees that any process in any
action  commenced  in such court  under this  Agreement  may be served  upon him
personally,  by certified or registered mail, return receipt requested, or by an
overnight courier service which obtains evidence of delivery, with the same full
force and effect as if  personally  served upon him in New York City in addition
to any other method of service permitted by law, and (iii) waives any claim that
the  jurisdiction  of any such  tribunal is not a convenient  forum for any such
action and any defense of lack of in personam jurisdiction with respect thereto.

            (c) This Agreement shall be binding upon and inure to the benefit of
the parties hereto, and their respective successors and permitted assigns.

            (d) In the event that any provision of this Agreement  becomes or is
declared by a court of competent  jurisdiction to be illegal,  unenforceable  or
void,  this  Agreement  shall  continue  in full force and effect  without  said
provision.

            (e)  Each  party   shall,   without   payment   of  any   additional
consideration  by any  other  party,  at any time on or  after  the date of this
Agreement,  take such other action and execute such other and further  documents
and  instruments  as the other  party may  request in order to provide the other
party with the benefits of this Agreement.

            (f) All  references  to any gender  shall be deemed to  include  the
masculine, feminine or neuter gender, the singular shall include the plural, and
the plural shall include the singular.

            (g) This Agreement may be executed in two or more counterparts, each
of which shall be deemed an original but all of which together shall  constitute
one and the same document.

                   [Balance of page intentionally left blank]

<PAGE>

Hurley Group, Ltd.
Woodstead Associates, L.P.
Lake Trust
Smith Management Co., Inc.
January 26, 1998
Page 7


      Please confirm your agreement with the foregoing by signing this Agreement
where indicated and returning it to the Company.

                                       PORTA SYSTEMS CORP.

                                       By:__________________________

AGREED TO AND ACCEPTED:

SMITH MANAGEMENT COMPANY, INC.         HENLEY GROUP, LTD.

By:______________________________      By:______________________________

Name:____________________________      Name:____________________________

Title:___________________________      Title:___________________________

WOODSTEAD ASSOCIATES, L.P.             LAKE TRUST

By:______________________________      By:______________________________

Name:____________________________      Name:____________________________

Title:___________________________      Title:___________________________

<PAGE>

                                                                       Exhibit A

                         Information Concerning Holders

Name                          Tax ID Number   Principal Amount   Exchange Shares
- ----                          -------------   ----------------   ---------------
Henley Group, Ltd.            N.A.                  $  815,000           213,693
Woodstead Associates, L.P.    76-0278088               100,000            26,220
Lake Trust                    13-3624838               345,000            90,459
                                                    ----------           -------
      Total                                         $1,260,000           330,372
                                                    ==========           =======
                                                              


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