PORTA SYSTEMS CORP
S-3, 1998-03-30
TELEPHONE & TELEGRAPH APPARATUS
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     As filed with the Securities and Exchange Commission on March 27, 1998

                                                 Commission File No. 333-_______
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION

                                    FORM S-3

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                               PORTA SYSTEMS CORP.
             (Exact name of registrant as specified in its charter)

             Delaware                                   11-2203988
   (State or other jurisdiction            (I.R.S.  Employer Identification No.)
 of incorporation or organization)

                                         Mr. William V. Carney
                                         Chairman of the Board and
                                         Chief Executive Officer
                                         Porta Systems Corp.
575 Underhill Boulevard                  575 Underhill Boulevard
Syosset, New York 11791                  Syosset, New York 11791
 (516) 364-9300                          (516)  364-9300
(Address, including zip code, and        (Name, address, including zip code, and
telephone number, including area         telephone number, including area code,
code, of registrant's principal          of agent for service)
executive offices)                                      

                                 With a copy to:
                              Warren H. Esanu, Esq.
                        Esanu Katsky Korins & Siger, LLP
                                605 Third Avenue
                            New York, New York 10158
                                 (212) 953-6000

     Approximate date of commencement of proposed sale to the public: As soon as
practical on or after the effective date of this Registration Statement.

     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. [ ]

     If any of the securities being registered of this Form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [x]

     If this Form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. [ ]

     If this Form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ]

     If delivery of the  prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]


<PAGE>

                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
==========================================================================================================
                                                        Proposed          Proposed
        Title of Each Class                              Maximum          Maximum
         Securities to be            Amount to be    Offering Price      Aggregate           Amount of
            Registered                Registered      per Share(2)    Offering Price     Registration Fee
- ----------------------------------------------------------------------------------------------------------
<S>                                   <C>                <C>             <C>                <C>      
Common Stock, $.01 par                1,990,592          $3.8125         $7,589,132         $2,299.74
value(1)                                                             
- ----------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value,           600,000            $3.00         $1,800,000           $545.45
issuable upon the exercise of                                        
the Series B Warrants                                                
- ----------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value,           500,000            $1.56           $780,000           $236.36
issuable upon the exercise of                                        
the Series A Warrants                                                
- ----------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value,           460,068            $3.00         $1,380,204           $418.24
issuable upon the exercise of                                        
the Foothill Warrants                                                           
==========================================================================================================
</TABLE>

     (1) Represents (a) 1,840,592  shares of Common Stock which are  outstanding
and (b) 150,000  shares of Common Stock issuable upon the exercise of the Series
C Warrants.

     (2) Estimated solely for the purpose of calculating the registration fee in
accordance  with Rule 457(c) under the Securities  Act of 1933, as amended.  The
maximum  offering price with respect to the  outstanding  shares of Common Stock
and the Common  Stock  issuable  upon the  exercise  of the Series C Warrants is
based  on the  average  of the high and low  price  of the  Common  Stock on the
American Stock Exchange on March 17, 1998. The maximum  offering price per share
of the  other  warrants  is the  exercise  price per  share as  provided  in the
warrants.

     The Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effectiveness  until the Registrant shall
file a further  amendment  which  specifically  states  that  this  Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the  Securities  Act of 1933 or until the  Registration  Statement  shall become
effective  on such  date  as the  Securities  and  Exchange  Commission,  acting
pursuant to Section 8(a), may determine.


<PAGE>

                                3,550,660 Shares
                               PORTA SYSTEMS CORP.
                     Common Stock, par value $.01 per share

     This prospectus  relates to 3,550,660 shares of the Company's common stock,
par value $.01 per share ("Common Stock"), that may be sold from time to time by
certain selling  stockholders  ("Selling  Stockholders") named under the caption
"Selling  Stockholders."  Of these shares,  1,840,592 shares of Common Stock are
outstanding  shares that are owned by Selling  Stockholders,  600,000  shares of
Common  Stock are issuable  upon the exercise of Series B Common Stock  Purchase
Warrants (the "Series B Warrants"),  150,000 shares of Common Stock are issuable
upon the  exercise  of Series C Common  Stock  Purchase  Warrants,  which may be
issued in the future (the "Series C Warrants"  and,  together  with the Series B
Warrants,  the  "Financing  Warrants"),  500,000 shares of Common Stock issuable
upon the  exercise  of  Series A  Common  Stock  Purchase  Warrants  ("Series  A
Warrants"),  issued to and which may be issued to Arnhold  and S.  Bleichroeder,
Inc.  ("Bleichroeder")  and 460,068  shares of Common  Stock  issuable  upon the
exercise of  warrants  (the  "Foothill  Warrants")  issued to  Foothill  Capital
Corporation.  The  Financing  Warrants,  the Series A Warrants  and the Foothill
Warrants  are  collectively  referred  to  as  the  "Warrants."  For  a  further
description of these securities, see "Background."

     The Company will  receive none of the proceeds  from the sale of the Common
Stock  owned  by the  Selling  Stockholders.  To the  extent  that  the  Selling
Stockholders exercise the Warrants, the Company may receive up to (a) $1,800,000
from the exercise of the Series B Warrants,  based on an exercise price of $3.00
per share,  (b) $780,000 from the exercise of the Series A Warrants  based on an
exercise  price of $1.56 per share,  (c)  $1,380,204  from the  exercise  of the
Foothill  Warrants,  based on an exercise  price of $3.00 per share,  and (d) an
amount to be determined  from the 150,000  shares of Common Stock  issuable upon
the  exercise of the Series C Warrants,  which may be issued in the future.  See
"Background" for a description of the determination of the exercise price of the
Series C Warrants. The Foothill Warrants and the Series A Warrants have cashless
exercise  provisions  which will enable the holders of such  warrants to receive
the  number of shares of  Common  Stock as has a value  equal to the  difference
between the exercise price and the fair market value on the date of exercise. If
the holders exercise such cashless exercise rights, the Company will not receive
any proceeds from the exercise of such Financing  Warrants or Series A Warrants,
as the  case may be.  The  cost of this  registration  statement,  estimated  at
approximately  $50,000, is being paid by the Company pursuant to agreements with
the holders of the Common Stock and the Warrants.

     The Selling  Stockholders have advised the Company that any transfer of the
Warrants will be either pursuant to a sale at negotiated  prices or by gift, and
any sale of the Common Stock owned by the Selling  Stockholders or issuable upon
exercise of the Warrants held by the Selling  Stockholders  may be effected from
time to time in transactions  (which may include block  transactions)  by or for
the account of the Selling  Stockholders on the American Stock Exchange  ("ASE")
or in  negotiated  transactions,  a  combination  of  such  methods  of  sale or
otherwise.  Sales may be made at fixed  prices  which may be changed,  at market
prices or in negotiated  transactions,  a combination of such methods of sale or
otherwise. Such securities may also be transferred by gift.

     The Selling Stockholders may effect such transactions by selling securities
directly to purchasers,  through broker-dealers acting as agents for the Selling
Stockholders or to broker-dealers who may purchase  securities as principals and
thereafter  sell the  securities  from  time to time on the ASE,  in  negotiated
transactions or otherwise. Such broker-dealers, if any, may receive compensation
in  the  form  of  discounts,   concessions  or  commissions  from  the  Selling
Stockholders  and/or  the  purchasers  from whom such  broker-dealer  may act as
agents or to whom they may sell as principals or otherwise  (which  compensation
as to a particular broker-dealer may exceed customary commissions).  The Selling
Stockholders  have advised the Company that no arrangements  for the sale of any
of the shares of Common Stock included in this Prospectus have been made.

                                   ----------

AN INVESTMENT IN THE SECURITIES  OFFERED  HEREBY  INVOLVES A HIGH DEGREE OF RISK
AND  IMMEDIATE  AND  SUBSTANTIAL  DILUTION  AND  SHOULD  BE  CONSIDERED  ONLY BY
INVESTORS WHO CAN AFFORD TO SUSTAIN A LOSS OF THEIR ENTIRE INVESTMENT. SEE "RISK
FACTORS," WHICH BEGIN ON PAGE 3.

                                   ----------

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                 The date of this Prospectus is March ___, 1998


<PAGE>

     The Selling Stockholders  understand that the anti-manipulative rules under
the Securities  Exchange Act of 1934, as amended (the "Exchange Act"), which are
set  forth in  Regulation  M,  may  apply to its  sales  in the  market  and has
furnished the Selling  Stockholders with a copy of Regulation M. The Company has
also  informed  the Selling  Stockholders  of the need for delivery of copies of
this Prospectus.

     The Company  furnishes  its  stockholders  with annual  reports  containing
audited financial statements and with such other periodic reports as the Company
from time to time deems  appropriate  or as may be required by law.  The Company
uses the calendar year as its fiscal year.

                              AVAILABLE INFORMATION

     The  Company  is  subject  to  certain  informational  requirements  of the
Securities  Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  and, in
accordance therewith, files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements  and other  information  can be  inspected  and  copied at the public
reference  facilities  maintained by the  Commission at 450 Fifth Street,  N.W.,
Washington,  D.C. 20549 or at the regional offices of the Commission at Citicorp
Center, 500 West Madison Street,  Suite 1400, Chicago,  Illinois 60661 and Seven
World  Trade  Center,  Suite  1300,  New York,  New York  10048.  Copies of such
material can be obtained at prescribed rates from the Public  Reference  Section
of the  Commission  at 450 Fifth  Street,  N.W.,  Washington,  D.C.  20549.  The
Commission  maintains a Web site that contains  reports,  proxy and  information
statements and other information  regarding registrants that file electronically
with  the  Commission.  The  address  of such  site is  http//www.sec.gov.  Such
reports,  proxy  statements and other  information  can also be inspected at the
offices of the American Stock  Exchange,  Inc., 86 Trinity Place,  New York, New
York 10006-1881,  on which the Company's Common Stock is listed. This Prospectus
does not contain all of the information set forth in the Registration Statement,
of which this  Prospectus is a part, and exhibits  thereto which the Company has
filed  with  Commission  under  the  Securities  Act of 1933,  as  amended  (the
"Securities Act"), to which reference is hereby made.

NO PERSON IS  AUTHORIZED  TO GIVE ANY  INFORMATION  OR MAKE ANY  REPRESENTATIONS
OTHER  THAN THOSE  CONTAINED  IN THIS  PROSPECTUS  AND,  IF GIVEN OR MADE,  SUCH
INFORMATION  OR  REPRESENTATIONS   MUST  NOT  BE  RELIED  UPON  AS  HAVING  BEEN
AUTHORIZED.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following  documents have been filed by the Company with the Commission
(File No. I-8191) and are incorporated herein by reference:

     (1)  The Company's  Annual Report on Form 10-K for the year ended  December
          31, 1997;

     (2)  The  Company's   Proxy  Statement  for  its  1997  Annual  Meeting  of
          Stockholders;

     (3)  The Company's  Current  Report on Form 8-K,  dated January 2, 1998, as
          filed with the Commission on February 6, 1998; and

     (4)  The  description  of  the  Company's  Common  Stock  contained  in the
          Company's Registration Statement on Form 8-A, filed on April 26, 1977,
          which became effective on April 26, 1977.

     All documents filed pursuant to Section 13(a),  13(c), 14 or 15 of the 1934
Act after the date of this  Prospectus  shall be  deemed to be  incorporated  by
reference in this  Prospectus and to be a part hereof from the date of filing of
such documents.

     Any  statement  contained in a document  incorporated  by reference  herein
shall be deemed to be modified or superseded for purposes of this  Prospectus to
the extent that a statement  contained herein or in any other subsequently filed
document which also is or deemed to be incorporated by reference herein modifies
or supersedes such statement.  Any such statement so modified or superseded,  to
constitute a part of this Prospectus.


                                      - 2 -
<PAGE>

     The  Company  will  provide  without  charge  to each  person  to whom this
Prospectus is delivered,  upon the written or oral request of any such person, a
copy of the documents (excluding the exhibits thereto,  unless such exhibits are
specifically  incorporated  by reference into such  document)  referred to above
which have been or may be  incorporated  herein by reference  and not  furnished
herewith.  Requests  for such  documents  should be  directed  to Mr.  Edward B.
Kornfeld,  Senior Vice President  Operations and Chief Financial Officer,  Porta
Systems Corp., 575 Underhill Boulevard, Syosset, New York 11791, telephone (516)
364-9300.

                                  RISK FACTORS

     Purchasers  of the Common Stock are cautioned  that the  statements in this
Prospectus,  including statements in documents incorporated by reference in this
Prospectus, that are not descriptions of historical facts may be forward looking
statements  that  are  subject  to  risks  and  uncertainties.   In  particular,
statements in this Prospectus,  including any material incorporated by reference
in this  Prospectus,  that  state  the  Company's  or  management's  intentions,
beliefs, expectations,  strategies,  predictions or any other variations thereof
or comparable  phraseology  of the Company's  future  activities or other future
events or conditions  are  "forward-looking  statements" as that term is defined
under the Federal  securities  laws.  Forward-looking  statements are subject to
risks,  uncertainties  and other factors,  including,  but not limited to, those
identified under "Risk Factors," those described in Management's  Discussion and
Analysis of Financial Conditions and Results of Operations in the Company's Form
10-K for the year ended  December 31, 1997,  and in any other  filings which are
incorporated  by  reference  in this  Prospectus,  as well as  general  economic
conditions,  any one or more of which  could  cause  actual  results  to  differ
materially from those stated in such statements.

     An investment in the Company's Common Stock involves a high degree of risk.
Purchasers of the shares of Common Stock should consider  carefully,  along with
other factors, the following risks and should consult with his or her own legal,
tax and financial advisors with respect thereto.

     Recent losses. For the year ended December 31, 1997, the Company incurred a
net loss of $6.9 million,  or $2.22 per share (basic and  diluted),  on sales of
$62.2 million.  The Company generated net income before  extraordinary  gains of
$1.3 million, or $.57 per share ($.23 per share on a diluted basis), on sales of
$58.0 million for the year ended  December 31, 1996.  Prior to 1996, the Company
sustained  significant losses before extraordinary gain, which amounted to $32.8
million,  or $22.45  per  share,  on sales of $61.2  million  for the year ended
December 31, 1995,  and $40.0  million,  or $27.51 per share,  on sales of $69.0
million  for the year  ended  December  31,  1994.  The loss in 1997  reflects a
primarily non-cash charge of $11.5 million taken as a result of the reduction to
$3.65 from $6.55 of the  conversion  price of the  Company's  Zero Coupon Senior
Subordinated  Notes due January 2, 1998 ("Zero Coupon Notes") and the conversion
of Zero Coupon  Notes into Common  Stock at the reduced  conversion  price.  The
losses in 1995 and 1994 reflect  declining  gross  margins,  resulting  from the
Company's  illiquidity and other cash problems,  and reflected (i) the inability
of the Company to purchase  materials  efficiently and to obtain  materials from
certain  suppliers,  (ii) the  underabsorption  of  significant  overhead  costs
allocated  to costs of sales  due to  reduced  sales  volume,  (iii) the need to
rework  inventory in order to fulfill  customer  orders and (iv) the losses from
discontinued  unprofitable  business  units.  In the first quarter of 1996,  the
Company sold its fiber optics division, which had been operating at a loss.

     Working  capital  requirements.  At December  31,  1997,  the Company had a
working capital of $6.3 million.  Since December 31, 1997, the Company's working
capital  improved  with the  issuance of $6.0  million  principal  amount of 12%
Subordinated Notes due January 3, 2000. The proceeds from the sale of such notes
was used (i) to pay the $2.8 million  outstanding  principal balance of its Zero
Coupon  Notes  which  were due  January 2,  1998,  (ii) to reduce the  Company's
obligations to Foothill,  its senior lender, by approximately  $2.95 million and
(iii) for working capital.

     At December 31, 1997,  the Company owed Foothill  $17.9 million in addition
to standby letters of credit of approximately  $6.8 million.  Under the terms of
the Company's agreement with Foothill,  as amended, the Company's obligations to
Foothill  mature on August 31, 1999.  The Company's  obligations to Foothill are
secured by security  interests in substantially all of its assets. The Company's
revolving credit agreement with Foothill has been the Company's principal source
of funding for its operations since November 1994. Prior to August 31, 1999, the
maturity  date of its  obligations  to Foothill,  it will be  necessary  for the
Company  either to extend its  agreement  with  Foothill  or  negotiate  lending
agreements with other lending  institutions.  There can be no assurance that the
Company  will be able to  extend  its  agreement  with  Foothill  or enter  into
acceptable  agreements with other lenders.  The failure to obtain such necessary
financing would have a material adverse effect upon the Company's business.


                                      - 3 -
<PAGE>

     Dependence  on  foreign  sales.  Approximately  71%,  70%  and  73%  of the
Company's  sales  for  the  years  ended  December  31,  1997,  1996  and  1995,
respectively,  were made to foreign telephone  operating  companies.  In foreign
markets, the Company faces considerable competition from other United States and
foreign  telephone  equipment  manufacturers  most of which are  larger and have
substantially  greater  financial  resources  than the  Company.  In  selling to
customers in foreign countries, there are inherent risks not normally present in
the case of sales to United States customers,  including increased difficulty in
identifying  and  designing  systems  compatible  with  purchasers'  operational
requirements,  extended delays under the Company's  Operational  Support Systems
("OSS Systems") contracts in the completion of testing and purchaser  acceptance
phases and the Company's  receipt of final payments,  and political and economic
change. In addition,  to the extent that the Company  establishes  facilities in
foreign countries, the Company faces risks associated with currency devaluation,
difficulties  in either  converting  local currency into dollars or transferring
funds to the United  States,  local tax and currency  regulations  and political
instability.  Furthermore,  OSS Systems are often  marketed to lesser  developed
countries,  which may be unable to fund the purchase  without the  assistance of
the World Bank, a United Nations  affiliate,  or a similar  organization,  which
both  delays and  complicates  the  execution  of a  contract  and the timing of
payments.  Also, the economies of lesser developed  countries are often unstable
and, as a result, such countries may be unable to perform their obligations.

     Significant  customers.  During the years ended December 31, 1997, 1996 and
1995, the Company's five largest customers accounted for sales of $30.6 million,
or approximately 49% of sales, $27.8 million, or approximately 48% of sales, and
$31.5  million,  or  approximately  52% of sales,  respectively.  The  Company's
largest customer is British Telecommunications,  plc ("BT"). Sales to BT for the
1997, 1996 and 1995 amounted to approximately  $13.9 million,  $11.3 million and
$17.3 million, respectively, or approximately 22%, 20% and 28%, respectively, of
the Company's sales for such years. Therefore,  any significant  interruption or
decline in sales to BT may have a materially  adverse  effect upon the Company's
operations.  During 1996, sales to Philippines Long Distance Telephone were $7.0
million,  or  approximately  12% of  sales.  During  1995,  sales  to the  Korea
Telephone  Company were $7.7 million,  or  approximately  13% of sales. No other
customer accounted for 10% or more of the Company's sales for any of such years.
Approximately 64% and 33% of accounts  receivable at December 31, 1997 and 1996,
respectively, are due from the Company's five largest customers.

     In November 1996, the Company amended its supply agreement with BT pursuant
to which it sold line  connecting/protecting  products  to BT.  Pursuant  to the
amended  agreement,  the  Company is no longer the  exclusive  supplier of these
products to BT. The amended contract also provides for a cross-license which, in
effect,  enables BT to use certain of the Company's  proprietary  information to
modify or enhance  products  provided  to BT and  permits  those  products to be
manufactured by BT or others for its own purposes.

     In  addition,  the regional  Bell  operating  companies  continue to be the
ultimate  purchasers of a significant  portion of the Company's products sold in
the  United  States,  while  sales  to  foreign  telephone  operating  companies
constitute  the major  portion of the  Company's  foreign  sales.  The Company's
contracts with these customers  require no minimum  purchases by such customers.
Significant  customers for the Company's signal processing  products include the
major domestic  aerospace  companies,  Department of Defense  service depots and
OEMs in the medical  imaging  and process  control  equipment  industries.  Both
catalog and custom designed products are sold to these customers.

     Delays  and  unpredictability  associated  with OSS System  contracts.  OSS
Systems are complex  systems and incorporate  features  designed to respond to a
purchaser's operational  requirements and the particular  characteristics of the
purchaser's  telephone system. As a result, the negotiation of a contract for an
OSS System is an  individualized  and highly  technical  process.  In  addition,
contracts  for OSS  Systems  frequently  provide  for  manufacturing,  delivery,
installation,  testing and  purchaser  acceptance  phases  which take place over
periods of up to a year or more. Such contracts  typically  contain  performance
guarantees by the Company and clauses imposing  penalties on the Company if "in-
service" dates are not met. The installation,  testing and purchaser  acceptance
phases of these  contracts  may last longer than  contemplated  by the contracts
and,  accordingly,  amounts  due  under the  contracts  may be  uncollected  for
extended  periods.  Delays in  purchaser  acceptance  of the  systems and in the
Company's  receipt of final contract payments have occurred in connection with a
number of foreign sales.  In addition,  the Company has experienced no steady or
predictable flow of orders for OSS Systems.

     Competition.  The  telephone  equipment  market in which the  Company  does
business is characterized by intense competition, rapid technological change and
a movement to private ownership of telecommunications  systems. In competing for
telephone  operating  company  business,  the purchase  price of  equipment  and
associated operating expenses are significant factors, along with product design
and long-standing equipment supply relationships. In the customer premises


                                      - 4 -
<PAGE>

equipment market, the Company operates in a market characterized by distributors
and installers of equipment and by commodity pricing.

     The Company  competes  directly with a number of large and small  telephone
equipment  manufacturers  in  the  United  States.  Lucent  Technologies,   Inc.
("Lucent")  continues to be the Company's  principal  United States  competitor.
Lucent's  greater  resources,  extensive  research and  development  facilities,
long-standing  equipment supply  relationships with regional operating companies
and history of manufacturing and marketing products similar in function to those
produced by the  Company  continue to be  significant  factors in the  Company's
competitive  environment.  Furthermore,  in the past,  competitors have used the
Company's financial difficulties as a sales tool.

     Currently,  Lucent and a number of companies  with much  greater  financial
resources  than the  Company  produce,  or have  the  design  and  manufacturing
capabilities to produce,  products  competitive with the Company's products.  In
meeting this  competition,  the Company relies  primarily on the performance and
design  characteristics  of its products and  endeavors to offer its products at
prices and with  warranties that will make them  competitive.  Access to current
technological  advances  is  important  to the  Company's  ability to market its
products and the inability of the Company to incorporate  such technology in its
products could have a material adverse effect.

     In  connection  with  overseas  sales  of  its  line  connecting/protecting
equipment,  the Company has met with significant  competition from United States
and foreign  manufacturers of comparable  equipment and expects this competition
to  continue.  In  addition  to  Lucent,  a  number  of the  Company's  overseas
competitors have significantly greater resources than the Company.

     The Company  competes  directly with a number of  substantial  domestic and
international  companies  with respect to its sales of OSS  Systems.  In meeting
this  competition,  the Company  relies  primarily  on the  features of its line
testing  equipment,  its ability to  customize  systems and its ability to offer
such equipment at prices and with warranties that will make them competitive.

     Dependence  upon key  personnel.  The  Company  may be  dependent  upon the
continued  employment  of certain  key  employees,  including  senior  executive
officers.  The  failure  of the  Company  to retain  such  employees  may have a
material adverse effect upon the Company's business.

     Legal  proceedings.  In July 1996,  an action  was  commenced  against  the
Company and certain  present and former  directors  in the Supreme  Court of the
State of New York, New York County by certain  stockholders  and warrant holders
of the Company who acquired their  securities in connection with the acquisition
by the Company of Aster  Corporation.  The complaint  alleges breach of contract
against the Company and breach of fiduciary  duty against the directors  arising
out of an alleged  failure to register  certain  restricted  shares and warrants
owned by the  plaintiffs.  The  complaint  seeks  damages of $413,000;  however,
counsel for the plaintiff  have advised the Company that  additional  plaintiffs
may  be  added  and,  as  a  result,  the  amount  of  damages  claimed  may  be
substantially  greater than the amount presently  claimed.  The Company believes
that the  defendants  have  valid  defenses  to the  claims.  The case is in the
discovery stage.

     In July 1996,  the  Commission  issued an order (the  "Order")  directing a
private  investigation  of the  Company to  determine  whether  there has been a
violation of Federal  securities  laws. The Commission  indicated to counsel for
the Company that the  investigation  relates to the  position of the  Commission
staff  that the  independence  of the  Company's  auditors  for 1995,  KPMG Peat
Marwick LLP ("Peat Marwick"),  was adversely  impacted by certain  relationships
involving Peat Marwick,  KPMG BayMark  Strategies LLC  ("BayMark") and Edward R.
Olson, the President of BayMark and the Company's  former interim  president and
chief  operating  officer.  The  Company is  continuing  to  cooperate  with the
Commission's investigation. The Company retained BDO Seidman, LLP to reaudit the
Company's 1995 financial statements, which reaudit resulted in no changes to the
Company's 1995 financial statements as audited by Peat Marwick. The Company does
not believe that the investigation  will result in any material liability on the
part of the  Company.  The  Company  has not been  contacted  by the  Commission
respecting this investigation since November 1996.

     Year 2000 Issue.  Many  existing  computer  programs use only two digits to
identify a year. These programs were designed and developed without  considering
the  impact  of the  upcoming  change in the  century.  If not  corrected,  many
computer  applications  could fail or create erroneous results by or at the year
2000.  This issue is  referred  to as the "Year 2000  issue."  The  Company  has
initiated a company-wide  program to prepare the Company's  computer systems and
applications  to deal with the Year 2000  issue.  The  Company  expects to incur
internal staff costs and other expenses to prepare


                                      - 5 -
<PAGE>

its systems  for the year 2000.  The Company  expects  both to replace  existing
systems  and to upgrade  other  systems.  The total cost of this effort is being
evaluated. Although the Company does not expect such costs to be material, there
can be no assurance that such costs will not be material.

     Possibility of delisting from the American  Stock  Exchange.  The Company's
Common Stock is presently listed on the ASE. To the extent that it does not meet
the ASE's  requirements  for continued  listing,  it is possible that the Common
Stock could be delisted from the ASE, and no assurance can be given that, if the
Common  Stock is delisted  from the ASE, it will be eligible  for listing on The
Nasdaq Stock Market.  Accordingly,  in the event of such delisting,  trading, if
any, in the Common Stock would  thereafter be conducted in the  over-the-counter
market in the  so-called  "pink  sheets" or the  Nasdaq's  "Electronic  Bulletin
Board."  Consequently,  the  liquidity  of the  Company's  Common Stock could be
impaired,  not only in the number of securities  which could be bought and sold,
but also  through  delays in the timing of  transactions,  reduction in security
analysts' and the news media's coverage of the Company, and lower prices for the
Company's securities than might otherwise be attained.

     Risks of  low-priced  stocks;  penny stock  regulations.  If the  Company's
securities  were delisted  from the ASE,  they may become  subject to Rule 15g-9
under the Exchange Act which imposes  additional sales practice  requirements on
broker-dealers  which sell such  securities  to persons  other than  established
customers and institutional  accredited  investors.  For transactions covered by
this rule, a broker-dealer must make a special suitability determination for the
purchaser and have received the  purchaser's  written consent to the transaction
prior to sale.  Consequently,  the rule may affect the ability of broker-dealers
to sell the Company's Common Stock.

     The foregoing penny stock restrictions do not apply to the Company's Common
Stock  as long as it is  listed  on the ASE and has  certain  price  and  volume
information  provided on a current and continuing  basis or meet certain minimum
net tangible assets or average revenue criteria.  There can be no assurance that
the Company's securities will qualify for exemption from these restrictions.  In
any event, even if the Company's  securities are exempt from such  restrictions,
it would remain subject to Section 15(b)(6) of the Exchange Act, which gives the
Commission  the  authority  to  prohibit  any person that is engaged in unlawful
conduct while  participating in a distribution of a penny stock from associating
with a broker-dealer or participating in a distribution of a penny stock, if the
Commission finds that such a restriction would be in the public interest.

     No Common Stock dividends  anticipated.  The Company has not paid dividends
on its Common Stock and does not anticipate  paying dividends in the foreseeable
future.  The Company  presently  intends to retain future  earnings,  if any, in
order to provide  funds for use in the  operation  and expansion of its business
and, accordingly,  does not anticipate paying cash dividends on its Common Stock
for the foreseeable  future. In addition,  the Company's agreement with Foothill
prohibits payment of dividends.

                                 USE OF PROCEEDS

     The Company  will not receive any  proceeds  from the sale of the shares of
Common  Stock.  To the extent that the Company  receives any  proceeds  from the
exercise of any Warrants  held or to be held by the Selling  Stockholders,  such
proceeds will be used by the Company for working  capital and general  corporate
purposes. The Foothill Warrants and the Series A Warrants have cashless exercise
provisions  which will enable the holders of such warrants to receive the number
of shares of Common  Stock  with a value  equal to the  difference  between  the
exercise price and the fair market value on the date of exercise. If the holders
exercise  such  cashless  exercise  rights,  the  Company  will not  receive any
proceeds from the exercise of such Financing  Warrants or Series A Warrants,  as
the case may be.

                                   BACKGROUND

Conversion of Zero Coupon Notes

     On  October  10,  1997,  the  Company  executed  a  supplemental  indenture
("Supplemental  Indenture")  with  American  Stock  Transfer  &  Trust  Company,
pursuant to which the  conversion  price of the Company's  Zero Coupon Notes was
reduced to $3.65 from $6.55 per share.  The Company has 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.  In  connection  with  the
execution of the  Supplemental  Indenture,  the Company  executed a registration
rights agreement pursuant to which it agreed to register the shares


                                      - 6 -
<PAGE>

of Common Stock owned by those holders of the Zero Coupon Notes who, as a result
of their conversion, became affiliates of the Company.

     Prior to the execution of the Supplemental Indenture,  the Company obtained
the  agreement  of certain  holders of Zero Coupon  Notes to convert  their Zero
Coupon Notes into Common Stock if the amended conversion terms became effective.
In  connection  with such  agreement,  the Company  agreed to elect Mr. Lloyd I.
Miller,  III as a director of the Company.  Mr. Miller was elected as a director
on March 17, 1998.

     Pursuant  to an  agreement  dated May 1,  1997,  between  the  Company  and
Bleichroeder  relating to services  rendered by  Bleichroeder in connection with
the negotiation and  implementation of the amended  conversion terms of the Zero
Coupon Notes the Company issued Series A Warrants to purchase  400,000 shares of
Common Stock to  Bleichroeder,  of which warrants to purchase  350,000 shares of
Common Stock are presently exercisable and warrants to purchase 50,000 shares of
Common Stock become exercisable in May 1998. The Company also agreed to issue to
Bleichroeder  Series A Warrants  to  purchase an  additional  100,000  shares of
Common Stock in the event that Bleichroeder  provides services to the Company in
connection with its efforts to find a new secured lender.  The exercise price of
the Series A Warrants  is $1.56 per share.  The Series A Warrants  contain (i) a
provision  for  cashless  exercise of such  warrants  and (ii)  provisions  that
protect  Bleichroeder  against  dilution by adjustment of the exercise  price in
certain specified events, such as stock dividends,  stock splits,  mergers, sale
of substantially all of the Company's assets and other similar events.

January 1998 Interim Financing

     In January 1998, the Company  issued and sold 60 units  consisting of a 12%
Note in the  principal  amount of  $100,000  and Series B Warrants  to  purchase
10,000  shares of Common  Stock at $3,00 per share,  for  $100,000  a unit.  The
Company  agreed that,  to the extent that any 12% Note is  outstanding  one year
from the date on such Note was issued (the "Anniversary Date of the Note"),  the
Company  shall issue to the holder of such 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% Note then outstanding. The Series C Warrant will have an
exercise  price equal to the average of the closing price of the Common Stock on
each of the five trading days  preceding the  Anniversary  Date of the Note. The
$6.0  million  gross  proceeds  from the sale of the  units  was used to pay the
remaining  principal  amount of Zero Coupon  Notes which had not been  converted
(approximately  $2.8  million),  and to pay a portion of the  Company's  debt to
Foothill,  the Company's  secured  lender  (approximately  $2.95  million).  The
balance was added to working capital.

     The Series B Warrants are exercisable  during the period  commencing on the
date of issuance and terminating on December 31, 2002. The Series C Warrants, if
issued, will be exercisable during the period commencing on the date of issuance
and terminating on December 31, 2003. The Financing Warrants provide the holders
with certain cashless exercise provisions in the event that the shares of Common
Stock  issuable upon the exercise of the Financing  Warrants are not  registered
under the Securities Act. Furthermore, the Financing Warrants contain provisions
that protect the holders thereof against  dilution by adjustment of the exercise
price in  certain  specified  events,  such as stock  dividends,  stock  splits,
mergers,  sale of  substantially  all of the Company's  assets and other similar
events.

     In connection with the sale of the units, the Company issued 120,000 shares
of Common Stock to Bleichroeder, which served as placement agent for the sale of
the units.

Foothill Warrants

     In January 1998, the Company  amended its agreement  with  Foothill,  as of
November  30,  1997,  to extend the  expiration  date of the  agreement  and the
Company's  obligations to Foothill under 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. The Foothill Warrants contain (i) a provision for
cashless  exercise of such warrants and (ii)  provisions  that protect  Foothill
against  dilution  by  adjustment  of the  exercise  price in certain  specified
events, such as stock dividends,  stock splits,  mergers,  sale of substantially
all of the Company's assets and other similar events and certain sales of Common
Stock at a price below the exercise price of the Foothill Warrants.


                                      - 7 -
<PAGE>

Conversion of 6% Convertible Subordinated Debentures

     In January  1998,  the Company  issued  330,372  shares of Common  Stock in
exchange  for  cancellation  of  $1.26  million   principal  amount  of  its  6%
Convertible  Subordinated  Debentures  Due July 1, 2002 ("6%  Debentures")  plus
accrued  interest.  Pursuant  to an  agreement  with  the  holders  of  such  6%
Debentures,  the  Company  agreed  to  register  such  shares  pursuant  to  the
Securities Act.

                              SELLING STOCKHOLDERS

     The  following  table sets forth (i) the name of each Selling  Stockholder,
(ii) the nature of any position, office or other material relationship,  if any,
which each Selling Stockholder has had with the Company or any of its affiliates
within the last three years, (iii) the number of shares of Common Stock owned by
each Selling  Stockholder  prior to the  offering,  (iv) the number of shares of
Common  Stock  offered  for  each  Selling  Stockholder's  account  and  (v) the
percentage owned by each Selling Stockholder after completion of the offering.

<TABLE>
<CAPTION>

                                                      Number                 Number of
                                                   of Shares            Shares Offered          Number of
                                                 Owned Prior            For Account of       Shares Owned      Percentage Owned
          Selling Stockholder                 to Offering(1)    Selling Stockholder(1)     After Offering     After Offering(2)
          -------------------                 --------------    ----------------------     --------------     -----------------
<S>                                                <C>                         <C>                <C>                      <C>
Lloyd I. Miller, III (3),(5)                          34,246                    34,246                  0                     *
Lloyd I. Miller, Trust A-2 (4), (5)                   31,250                    31,250                  0                     *
Lloyd I. Miller, Trust A-4 (5)                       464,063                   464,063                  0                     *
Lloyd I. Miller, Trust C (5)                         363,705                   363,705                  0                     *
Milfam I, L.P. (5)                                   694,502                   694,502                  0                     *
Milfam II, L.P. (5)                                  110,462                   110,642                  0                     *
Lloyd I. Miller III Keogh Plan (4)                    31,250                    31,250                  0                     *
Lloyd I. Miller, Trustee f/b/o
Kimberly S. Miller (5), (6)                            6,250                     6,250                  0                     *
Lloyd I. Miller, Trustee f/b/o
Catherine C. Miller (5), (6)                           6,250                     6,250                  0                     *
Lloyd I. Miller, custodian under
Florida UGMA for Alexandra B.
Miller (5), (6)                                        6,250                     6,250                  0                     *
Lloyd I. Miller, custodian under
Florida UGMA for Lloyd I. Miller,
IV (5), (6)                                            6,250                     6,250                  0                     *
Lloyd I. Miller, Trustee for the Lloyd
I. Miller III, Generation
Skipping Trust u/a/d 12/31/91 (5),(6)                  6,250                     6,250                  0                     *
Dail Miller (5)                                        1,000                     1,000                  0                     *
Foothill Capital Corporation (7)                     460,068                   460,068                  0                     *
Arnhold and S. Bleichroeder, Inc. (8)              1,064,076                   757,500            306,576                  3.5%
Smith Management Company, Inc.                       330,372                   330,372                  0                     *
Clarex Limited (9)                                    62,500                    62,500                  0                     *
Acamas Anstalt (9)                                    62,500                    62,500                  0                     *
Senvest International L.L.C. (9)                      62,500                    62,500                  0                     *
Senvest Master Fund L.P. (10)                         25,000                    25,000                  0                     *
Winston J. Churchill (10)                             25,000                    25,000                  0                     *
The Spiro Family Foundation (10)                      25,000                    25,000                  0                     *
Arthur M. Spiro, IRA (10)                             25,000                    25,000                  0                     *
Intergroup Corp. (11)                                 12,500                    12,500                  0                     *
John V. Winfield (11)                                 12,500                    12,500                  0                     *
Portsmouth Square, Inc. (11)                          12,500                    12,500                  0                     *
Santa Fe Financial Corp. (10)                         25,000                    25,000                  0                     *

</TABLE>


                                      - 8 -
<PAGE>

<TABLE>
<CAPTION>
                                                      Number                 Number of
                                                   of Shares            Shares Offered          Number of
                                                 Owned Prior            For Account of       Shares Owned      Percentage Owned
          Selling Stockholder                 to Offering(1)    Selling Stockholder(1)     After Offering     After Offering(2)
          -------------------                 --------------    ----------------------     --------------     -----------------
<S>                                                  <C>                        <C>                   <C>                   <C>
Offshore Strategies Ltd. (10)                        25,000                     25,000                  0                     *
Laterman & Co. L.P. (11)                             12,500                     12,500                  0                     *
Laterman Strategies 90's LLC (10)                    25,000                     25,000                  0                     *
Romulus Holdings (9)                                 62,500                     62,500                  0                     *
Elmira Realty Management Corp.
Pension & Profit Sharing Plan (11), (12)             12,500                     12,500                  0                     *
Iroquois Builders (11)                               12,500                     12,500                  0                     *
Bobbi & Steven Investment
 LLC (11)                                            12,500                     12,500                  0                     *
Lawrence J. Arem & Stephen T.
Burmundy TTEE Klehr Harrison
Harvey Branzburg & Ellers FBO
Leonard Klehr (6)                                     6,250                      6,250                  0                     *

</TABLE>

- ----------
*    Less than one percent.

(1)  Includes shares of Common Stock issuable upon the exercise of the Financing
     Warrants,  Foothill  Warrants  and/or the Series A Warrants.  The number of
     shares  issuable upon exercise of Series C Warrants  represents the maximum
     number of shares  issuable  upon exercise of such warrants if such Warrants
     are issued. See "Background -- January 1998 Interim Financing."

(2)  Assumes exercise of all of such Selling  Stockholder's  Financing Warrants,
     Foothill  Warrants and/or Series A Warrants.  Based on 9,060,954  shares of
     Common Stock outstanding.

(3)  In connection with the Company's agreement with certain holders of the Zero
     Coupon Notes to convert their debt  securities into shares of Common Stock.
     Mr. Miller was elected to the Board of Directors on March 17, 1998.

(4)  Consists solely of 25,000 shares of Common Stock issuable upon the exercise
     of the Series B Warrants and 6,250 shares of Common Stock issuable upon the
     exercise of the Series C Warrants.

(5)  Mr.  Miller is (a) the  investment  adviser for the Lloyd I. Miller,  Trust
     A-2, the Lloyd I. Miller,  Trust A-4, and the Lloyd I. Miller, Trust C, (b)
     the manager of the  managing  general  partner of Milfam I, L.P. and Milfam
     II, L.P.,  and (c) the trustee of trusts and  custodian of accounts for the
     benefit of his family members.  The trustee of the Lloyd I. Miller,  Trusts
     A-2,  A-4 and C is PNC  Bank,  National  Association.  As a  result  of his
     investment advisory agreement, Mr. Miller has shared voting and dispositive
     power as to the shares  held by Trust  A-2,  Trust A-4 and Trust C. He also
     has shared voting and dispositive  power as to the shares held by the Lloyd
     I.  Miller  Trust f/b/o  Kimberly  Miller.  Mr.  Miller has sole voting and
     dispositive power as to all of the other shares,  including the shares held
     in the custodial  accounts and by the other  trusts,  except for the shares
     owned  by his  wife,  Dail  Miller,  as to which  he  disclaims  beneficial
     ownership.

(6)  Consists  solely of 5,000 shares of Common Stock issuable upon the exercise
     of the Series B Warrants and 1,250 shares of Common Stock issuable upon the
     exercise of the Series C Warrants.

(7)  Consists  solely  of  460,068  shares  of Common  Stock  issuable  upon the
     exercise of the Foothill Warrants.

(8)  Consists of (a) 426,576 shares of Common Stock owned by  Bleichroeder,  (b)
     350,000  shares of Common  Stock  issuable  upon  exercise  of the Series A
     Warrants currently held by Bleichroeder,  (c) 50,000 shares of Common Stock
     issuable  upon  exercise of the Series A Warrants to be issued in May 1998,
     (d) 100,000  shares of Common Stock  issuable upon exercise of the Series A
     Warrants which may be issued to Bleichroeder under certain conditions,  (e)
     110,000  shares of Common Stock  issuable upon the exercise of the Series B
     Warrants,  and (f) 27,500 shares of Common Stock issuable upon the exercise
     of the Series C Warrants.


                                      - 9 -

<PAGE>

(9)  Consists solely of 50,000 shares of Common Stock issuable upon the exercise
     of the Series B Warrants and 12,500  shares of Common Stock  issuable  upon
     the exercise of the Series C Warrants.

(10) Consists solely of 20,000 shares of Common Stock issuable upon the exercise
     of the Series B Warrants and 5,000 shares of Common Stock issuable upon the
     exercise of the Series C Warrants (when issued).

(11) Consists solely of 10,000 shares of Common Stock issuable upon the exercise
     of the Series B Warrants and 2,500 shares of Common Stock issuable upon the
     exercise of the Series C Warrants (when issued).

(12) Warren H. Esanu,  has been a director of the Company  since April 1997.  He
     also  served as a  director  from 1989 to 1996 and as the  Chairman  of the
     Board from March 1996 to October 1996.  He has sole voting and  dispositive
     power with  respect to these  shares  under the terms of the Elmira  Realty
     Management  Corp.  Pension and Profit Sharing Plan. Mr. Esanu is of counsel
     to Esanu Katsky Korins & Siger, LLP, general counsel to the Company.

                              PLAN OF DISTRIBUTION

     The Selling  Stockholders have advised the Company that (i) any transfer of
any of the Warrants held by the Selling  Stockholders will be either pursuant to
a sale in transactions at negotiated prices or by gift and (ii) any sales of the
shares of Common Stock which are outstanding or which are issuable upon exercise
of such  warrants may be effected from time to time in  transactions  (which may
include block transactions by or for the account of the Selling  Stockholder) on
the ASE or in negotiated transactions,  a combination of such methods of sale or
otherwise.  Also, securities may be transferred by gift.

     The Selling  Stockholders  may effect  such  transactions  by selling  such
securities directly to purchasers,  through  broker-dealers acting as agents for
the Selling  Stockholders  or to  broker-dealers  who may  purchase  Warrants or
shares of Common Stock as principals  and thereafter  sell the  securities  from
time  to  time  on the  ASE,  in  negotiated  transactions  or  otherwise.  Such
broker-dealers,  if any,  may  receive  compensation  in the form of  discounts,
concessions or commissions  from the Selling  Stockholder  and/or the purchasers
from  whom  such  broker-dealer  may act as  agents  or to whom they may sell as
principals or otherwise (which compensation as to a particular broker-dealer may
exceed customary commissions).

     Bleichroeder,  which is one of the  Selling  Stockholder,  is a  registered
broker-dealer,  and may sell  shares  which it owns or which may be owned by its
customers.  However, Bleichroeder has no agreement or understanding with respect
to any sale of its  shares  of  Common  Stock or any  sales on  behalf  of other
Selling Stockholders.

     The Selling  Stockholders and broker-dealers,  if any, acting in connection
with such  sales  might be deemed to be  "underwriters"  within  the  meaning of
Section 2(11) of the Securities Act and any commission  received by them and any
profit on the  resale  of the  securities  might be  deemed  to be  underwriting
discount and commissions under the Securities Act.

                                  LEGAL MATTERS

     The  validity of the Common  Stock  offered  hereby has been passed upon by
Esanu Katsky Korins & Siger,  LLP,  legal counsel to the Company.  Mr. Warren H.
Esanu,  a director of the Company is of counsel to Esanu Katsky  Korins & Siger,
LLP.

                                     EXPERTS

     The  consolidated  financial  statements  incorporated by reference in this
Prospectus and elsewhere in the Registration Statement to the extent and for the
periods  indicated  in their  report  have been  audited  by BDO  Seidman,  LLP,
independent  certified public  accountants,  and are included herein in reliance
upon the authority of such firm as experts in accounting  and auditing in giving
such report.

                    INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Under the Delaware  General  Corporation  Law ("DGCL"),  a corporation  may
indemnify any director,  officer,  employee or agent against expense  (including
attorneys' fees), judgments,  fines and amounts paid in settlement in connection
with any specified threatened,


                                     - 10 -
<PAGE>

pending or  completed  action,  suit or  proceeding,  whether  civil,  criminal,
administrative or investigative  (other than an action by or in the right of the
corporation)  if such  person  acted in good faith and in a manner  such  person
reasonably  believed  to be in or not  opposed  to  the  best  interests  of the
corporation,  and,  with respect to any criminal  proceeding,  had no reasonable
cause to believe that his or her conduct was unlawful.

     The Company's  Certificate of Incorporation  provides,  among other things,
that the Company shall indemnify, to the fullest extent permitted under the DGCL
as it may be amended  from time to time,  any person who is or was a director or
officer of the Company and who is or was a party or is  threatened  to be made a
party to any  threatened,  pending  or  completed  action,  suit or  proceeding,
whether civil,  criminal,  administrative or investigative (other than an action
by or in the right of the  Company),  by reason of the fact that such person (i)
is or was a director or officer of the Company, or (ii) is or was serving at the
request  of the  Company  as  director,  officer,  employee,  agent  of  another
corporation,  partnership,  joint venture, trust, or other enterprise (including
service with respect to employee benefit plans), against all expense,  liability
and loss (including  attorneys' fees,  judgments,  fines,  ERISA excise taxes or
penalties and amounts paid or to be paid in settlement)  actually and reasonably
incurred by such person in connection with such action, suit or proceeding. This
indemnification  continues  as to a person who has  ceased to be a  director  or
officer  of the  Company  and  inures to the  benefit  of such  person's  heirs,
executors and administrators. The right of indemnification under the Certificate
of Incorporation is deemed to be a contract right.

     The Company also maintains directors and officers liability insurance ("D&O
Insurance").  The D&O Insurance  covers any person who has been or is an officer
or  director  of the  Company  or of any of its  subsidiaries  for all  expense,
liability and loss (including attorneys' fees,  investigation costs,  judgments,
fines,  penalties  and amounts  paid or to be paid in  settlement)  actually and
reasonably  incurred  by such person in  connection  with such  action,  suit or
proceeding.


                                     - 11 -
<PAGE>

================================================================================

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

                                TABLE OF CONTENTS
                                                                            Page
                                                                            ----

Available Information ........................................................2
Incorporation of Certain Documents by                             
Reference ....................................................................2
Risk Factors..................................................................3
Use of Proceeds...............................................................6
Background....................................................................6
Selling Stockholders..........................................................8
Plan of Distribution..........................................................10
Legal Matters.................................................................10
Experts.......................................................................10
Indemnification of Officers and Directors.....................................10
                                              
                           ---------------------------

================================================================================

================================================================================

                                3,550,660 Shares
                                                
                               Porta Systems Corp.
                                                
                     Common Stock, par value $.01 per share
                                                
                                ----------------
                                   PROSPECTUS
                                ----------------
                                                
                                  March__, 1998
                                                
================================================================================

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

         SEC Registration Fee............................................$3,500
         Printing and EDGAR Filing Fees..................................$1,500
         Legal Fees and Expenses........................................$35,000
         Accounting Fees.................................................$5,000
         Miscellaneous...................................................$5,000
                                                                        -------
         Total                                                          $50,000
                                                                        =======

Item 15. Indemnification of Directors and Officers

     Section  145 of the  General  Corporation  Law of  the  State  of  Delaware
provides that a corporation may indemnify its officers and directors (or persons
who have  served,  at the  corporation's  request,  as officers or  directors of
another corporation) against the reasonable expenses,  including attorneys' fees
actually and reasonably  incurred by them in connection  with the defense of any
action by reason of being or having been  directors or officers,  if such person
shall have acted in good faith and in a manner he or she reasonably  believed to
be in, or not opposed to, the best interests of the corporation,  except that if
such action shall be in the right of the  corporation,  no such  indemnification
shall be provided as to any claim, issue or matter as to which such person shall
have been judged to have been liable to the corporation unless and to the extent
that the Court of Chancery of the State of Delaware, or any other court in which
the suit may be brought,  shall determine upon application  that, in view of all
the circumstances of the case, such person is fairly and reasonably  entitled to
indemnification.

Item 16. Exhibits

4.1  Form of  Subscription  Agreement  for Units,  including the form of the 12%
     Note,  the  Series B  Warrant  and the  Series C Warrant  (incorporated  by
     reference  from Exhibit 10.1 to the Company's  Current  Report on Form 8-K,
     dated  January 2, 1998,  as filed with the  Commission  on February 6, 1998
     (the "January 1998 Form 8-K")).

4.2  Registration Rights Agreement, dated as of October 10, 1997, by and between
     the Company and the Holders of the Zero Coupon Notes described therein.

4.3  Warrant to Purchase  Common Stock of the Company,  dated  November 28, 1994
     executed by the Company in favor of Foothill  (incorporated by reference to
     Exhibit 6 to the Company's  Current  Report on Form 8-K, dated November 30,
     1994, as filed with the Commission on December 15, 1994).

4.4  Amendment  Number One to Warrant to Purchase  Common  Stock of the Company,
     dated  February  13,  1995,  executed  by the  Company in favor of Foothill
     (incorporated by reference to Exhibit 4.12.1 to the Company's Annual Report
     on Form 10-K for the year ended December 31, 1995).

4.5  Amendment  Number  Five,  dated as of  November  30,  1997,  to Amended and
     Restated  Loan an Security  Agreement  between  Foothill  and the  Company,
     including  amendments to the Foothill  Warrants  (incorporated by reference
     from Exhibit 4.1 to the January 1998 Form 8-K).

4.6  Agreement dated January 26, 1998, among the Company and Henley Group, Ltd.,
     Woodstead  Associates,  L.P., Lake Trust and Smith Management Company, Inc.
     (incorporated by reference from Exhibit 10.2 to the January 1998 Form 8-K).

4.7  Agreement, dated May 1, 1997, between Bleichroeder and the Company.

4.8  Form of Series A Common Stock Purchase Warrant.

5.1  Opinion of Esanu Katsky Korins & Siger, LLP.

23.1 Consent of Esanu  Katsky  Korins & Siger,  LLP  (contained  in Exhibit  5.1
     hereto).


                                      II-1
<PAGE>

23.2 Consent of BDO Seidman, LLP.

24.1 Power of Attorney  (included  on the  signature  page to this  Registration
     Statement).

Item 17. Undertakings

     (a) The undersigned registrant hereby undertakes:

          (1) to file,  during  any  period  in which  offers or sales are being
made, a post-effective  amendment to this Registration Statement with respect to
the following:

               (i) to include any prospectus required by Section 10(a)(3) of the
Securities Act of 1933, as amended (the "Securities Act");

               (ii) to reflect  in the  prospectus  any facts or events  arising
after the  effective  date of the  registration  statement  (or the most  recent
post-effective  amendment  thereof)  which,  individually  or in the  aggregate,
represent a fundamental  change in the information set forth in the registration
statement.  Notwithstanding the foregoing, any increase or decrease in volume of
securities  offered (if the total dollar value of  securities  offered would not
exceed that which was  registered) and any deviation from the low or high end of
the estimated  maximum offering range may be reflected in the form of prospectus
filed with the  Commission  pursuant  to Rule 424(b) if, in the  aggregate,  the
changes in volume and price  represent  no more than a 20% change in the maximum
aggregate  offering price set forth in the  "Calculation  of  Registration  Fee"
table in the effective registration statement;

               (iii) to include any  material  information  with  respect to the
plan of distribution not previously  disclosed in the Registration  Statement or
any material change to such information in the Registration Statement;

provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
Registration Statement is on Form S-3, Form S-8 or Form F-3, and the information
required to be included in a  post-effective  amendment by those  paragraphs  is
contained in periodic  report filed with or furnished to the  Commission  by the
registrant  pursuant to Section 13 or 15(d) of the  Securities  Exchange  Act of
1934 that are incorporated by reference in the Registration Statement.

          (2) that for the  purpose  of  determining  any  liability  under  the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (3) to remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

     (b) The undersigned  registrant hereby undertakes that, for the purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
registrant's  annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable,  each filing of an employee benefit
plan's  annual  report  pursuant to Section  15(d) of the Exchange  Act) that is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (h) Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
registrant pursuant to the foregoing  provisions,  or otherwise,  the registrant
has been advised that in the opinion of the Commission such  indemnification  is
against  public  policy as expressed in the  Securities  Act and is,  therefore,
unenforceable.  In the  event  that a claim  for  indemnification  against  such
liabilities  (other than the payment by the  registrant of expenses  incurred or
paid by a  director,  officer or  controlling  person of the  registrant  in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as  expressed  in the  Securities  Act and will be  governed by the final
adjudication of such issue.


                                      II-2
<PAGE>

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in Syosset, New York, on March 23, 1998.

                               Porta Systems Corp.

                               By:  s/ William V. Carney
                                    ----------------------------------------
                                    William V. Carney, Chairman of the Board
                                    and Chief Executive Officer

     Pursuant to the  requirements  of the  Securities  Act of 1933, as amended,
this  registration  statement has been signed by the following persons on behalf
of the registrant and in the capacities and on the dates indicated.  Each person
whose signature appears below hereby authorizes William V. Carney, Seymour Joffe
and Edward B.  Kornfeld or any of them  acting in the absence of the others,  as
his true and lawful  attorney-in-fact and agent, with full power of substitution
and  resubstitution  for him and in his name,  place and  stead,  in any and all
capacities to sign any and all amendments (including post-effective  amendments)
to this registration statement,  and to file the same, with all exhibits thereto
and other  documents in connection  therewith,  with the Securities and Exchange
Commission.

      Signature                        Title                           Date
      ---------                        -----                           ----
s/William V. Carney            Chairman of the Board,             March 23, 1998
- -------------------------      Chief Executive Officer and
William V. Carney              Director (Principal Executive 
                               Officer)

s/Edward B. Kornfeld           Senior Vice President and          March 23, 1998
- -------------------------      Chief Financial Officer 
Edward B. Kornfeld             (Principal Financial and 
                               Accounting Officer)

s/Seymour Joffe                Director                           March 23, 1998
- -------------------------
Seymour Joffe


s/Michael A. Tancredi          Director                           March 23, 1998
- -------------------------
Michael A. Tancredi


s/Howard D. Brous              Director                           March 23, 1998
- -------------------------
Howard D. Brous


s/Warren H. Esanu              Director                           March 23, 1998
- -------------------------
Warren H. Esanu


s/Herbert H. Feldman           Director                           March 23, 1998
- -------------------------
Herbert H. Feldman


s/Stanley Kreitman             Director                           March 23, 1998
- -------------------------
Stanley Kreitman


s/Lloyd I. Miller, III         Director                           March 23, 1998
- -------------------------
Lloyd I. Miller, III


s/Robert Schreiber             Director                           March 23, 1998
- -------------------------
Robert Schreiber


                                      II-3


                                                                     Exhibit 4.2

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

                          REGISTRATION RIGHTS AGREEMENT

                                     between

                               PORTA SYSTEMS CORP.

                                       and

                          THE HOLDERS DESCRIBED HEREIN

                       -----------------------------------
                          Dated as of October 10, 1997
                       -----------------------------------

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

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
1.  Definitions ...........................................................    1

2.  Initial Registration Under the Securities Act .........................    3
      (a) Shelf Registration ..............................................    3
      (b) Rights Under Sections 3 and 4 Conditional .......................    3

3.  Securities Act Registration on Request ................................    3
      (a) Request .........................................................    3
      (b) Registration Statement Form .....................................    4
      (c) Effective Registration Statement ................................    5
      (d) Priority in Requested Registration ..............................    5
      (e) Shelf Registrations .............................................    6
      (f) Continuing Obligation to Register ...............................    6

4.  Piggyback Registration ................................................    6

5.  Expenses ..............................................................    7

6.  Registration Procedures ...............................................    8

7.  Underwritten Offerings ................................................   11
      (a) Underwriting Agreement ..........................................   11
      (b) Piggyback Underwritten Offerings; Priority ......................   12
      (c) Holders of Registrable Common Stock to be
          Parties to Underwriting Agreement ...............................   12
      (d) Selection of Underwriters for Piggyback
          Underwritten Offering ...........................................   13

8.  Preparation; Reasonable investigation .................................   13
      (a) Registration Statements .........................................   13
      (b) Confidentiality .................................................   13

9.  Indemnification .......................................................   13
      (a) Indemnification by the Company ..................................   13
      (b) Indemnification by the Offerors and Sellers .....................   14
      (c) Notices of Losses, etc ..........................................   15
      (d) Contribution ....................................................   15
      (e) Other Indemnification ...........................................   16
      (f) Indemnification Payments ........................................   16


                                      -i-
<PAGE>

                                                                            Page
                                                                            ----
10. Registration Rights to Others .........................................   16

11. Adjustments Affecting Registrable Common Stock ........................   16

12. Rule 144 and Rule 144A ................................................   16

13. Amendments and Waivers ................................................   17

14. Nominees for Beneficial Owners ........................................   17

15. Assignment

16. Calculation of Percentage or Number of Shares
    of Registrable Common Stock ...........................................   17

17. Miscellaneous .........................................................   18
      (a) Further Assurances ..............................................   18
      (b) Headings ........................................................   18
      (c) No Inconsistent Agreements ......................................   18
      (d) Remedies ........................................................   18
      (e) Entire Agreement ................................................   18
      (f) Notices .........................................................   18
      (g) Governing Law ...................................................   19
      (h) Severability ....................................................   19
      (i) Counterparts ....................................................   19


                                       ii
<PAGE>

                          REGISTRATION RIGHTS AGREEMENT

     REGISTRATION RIGHTS AGREEMENT, dated as of October 10, 1997 (this
"Agreement"), by and among Porta Systems Corp., a Delaware corporation (the
"Company"), and those security holders of the Company who, in connection with
their conversion of Zero Coupon Senior Subordinated Notes due January 2, 1998
("Notes"), become Affiliates of the Company as a result of their conversion of
the Notes (the "Holders").

     To induce the holders of the Notes who, as a result of their conversion of
the Notes, become Affiliates of the Company, to convert the Notes and receive
shares of Common Stock issued by the Company, the Company has undertaken to
register Registrable Common Stock (as hereinafter defined) under the Securities
Act (as hereinafter defined) and to take certain other actions with respect to
the Registrable Common Stock. This Agreement sets forth the terms and conditions
of such undertaking.

     In consideration of the premises and the mutual agreements set forth
herein, the parties hereto hereby agree as follows:

     1. Definitions. Unless otherwise defined herein, capitalized terms used
herein and in the recitals above shall have the following meanings:

     "Affiliate" of a Person means any Person that controls, is under common
control with, or is controlled by, such other Person. For purposes of this
definition, "control" means the ability of one Person to direct the management
and policies of another Person.

     "Business Day" means any day except a Saturday, Sunday or other day on
which commercial banks in New York City are authorized or required by law to be
closed.

     "Commission" means the U.S. Securities and Exchange Commission.

     "Common Stock" means the shares of common stock, $0.01 par value per share,
of the Company.

     "Exchange" means the principal stock exchange or market on which the Common
Stock is traded, which is presently the American Stock Exchange, Inc.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations thereunder, or any similar or successor statute.

     "Excusable Reason" means the occurrence of negotiations with respect to
material agreements prior to the announcement of the execution of the agreement
or the termination of the negotiations and other similar material corporate
events to which the Company is a party or expects to be a party if, in the
reasonable judgment of the Company, disclosure of the negotiations or other
event would be adverse to the best interests of the Company provided that the
Company is continuing to treat such negotiations as confidential and provided
further that the period during which the Company is precluded from filing the
registration statement (or


<PAGE>

suspended the use of an effective registration statement) as a result thereof
has not exceeded 60 days and provided further that the Company shall not be
permitted to avoid filing a registration statement (or to suspend the use of an
effective registration statement) for an Excusable Reason more than twice in any
one-year period.

     "Expenses" means, except as set forth in Section 5 hereof, all expenses
incident to the Company's performance of or compliance with its obligations
under this Agreement, including, without limitation, all registration, filing,
listing, stock exchange and NASD fees, all fees and expenses of complying with
state securities or blue sky laws (including fees, disbursements and other
charges of counsel for the underwriters only in connection with blue sky
filings), all word processing, duplicating and printing expenses, messenger and
delivery expenses, all rating agency fees, the fees, disbursements and other
charges of counsel for the Company and of its independent public accountants,
including the expenses incurred in connection with "cold comfort" letters
required by or incident to such performance and compliance, any fees and
disbursements of underwriters customarily paid by issuers of securities and,
with respect to registration statements other than a Shelf Registration, up to
$15,000 of the reasonable fees, disbursements and other charges of one firm of
counsel (per registration statement prepared) to the Holders of Registrable
Common Stock (selected by the Holders holding a majority of the shares of
Registrable Common Stock covered by such registration), but excluding from the
definition of Expenses underwriting discounts and commissions and applicable
transfer taxes, if any, which discounts, commissions and transfer taxes shall be
borne by the seller or sellers of Registrable Common Stock in all cases.

     "Initiating Holders" has the meaning set forth in Section 3(a) hereof.

     "NASD" means the National Association of Securities Dealers, Inc.

     "NASDAQ" means the Nasdaq Stock Market and includes The Nasdaq National
Market and The Nasdaq SmallCap Market.

     "Notes" means the Company's Zero Coupon Senior Subordinated Convertible
Notes due January 2, 1998.

     "Person" means any individual, corporation, partnership, limited liability
company, firm, joint venture, association, joint stock company, trust,
unincorporated organization, governmental or regulatory body or subdivision
thereof or other entity.

     "Public Offering" means a public offering and sale of Common Stock pursuant
to an effective registration statement under the Securities Act.

     "Registrable Common Stock" means any shares of Common Stock held by the
Holders immediately following the conversion of the Notes as to which and only
for so long as registration pursuant to the Securities Act is required for
public sale without regard to volume limitations, as adjusted to reflect any
merger, consolidation, recapitalization, reclassification, split-up, stock
dividend, rights offering or reverse stock split made, declared or effected with
respect to the Common Stock.


                                       -2-
<PAGE>

     "Requesting Holders" has the meaning set forth in Section 4 hereof.

     "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations thereunder, or any similar or successor statute.

     "Selling Holders" means the Holders of Registrable Common Stock requested
to be registered pursuant to Section 3(a) hereof.

     "Shelf Registration" means a shelf registration statement pursuant to Rule
415 promulgated under the Securities Act.

     "Transfer" means any transfer, sale, assignment, pledge, hypothecation or
other disposition of any interest. "Transferor" and "Transferee" have
correlative meanings.

     2. Initial Registration Under the Securities Act.

          (a) Shelf Registration. The Company shall (i) cause to be filed not
later than 45 days after the date hereof a Shelf Registration statement
providing for the sale by the Holders of all of the Registrable Common Stock and
(ii) use its best efforts to have such Shelf Registration thereafter declared
effective by the Commission not later than 60 days after the date of filing,
subject to any delay for an Excusable Reason. The Shelf Registration shall
register the Registrable Common Stock for resale by the Holders in the manner or
manners designated by them (including, without limitation, one or more
underwritten offerings). The Company agrees to use its best efforts to keep the
Shelf Registration continuously effective until the end of the eighteenth month
following the date such Shelf Registration is declared effective by the
Commission or such shorter period which will terminate when all of the
Registrable Common Stock covered by the Shelf Registration has been sold
pursuant to the Shelf Registration, excluding from the calculation of such
eighteen-month period any period of time during which the Shelf Registration was
unavailable for use by the Holders due to any stop order, injunction or other
order or requirement of the Commission or other governmental or regulatory
agency or court as contemplated by Section 2(b)(ii) or for any other reason
including an Excusable Reason.

          (b) Rights Under Sections 3 and 4 Conditional. So long as the Company
has complied and continues to remain in compliance with Section 2(a) of this
Agreement, the Holders shall have no right to cause the filing of a registration
statement pursuant to Section 3 hereof or to participate in an offering under a
registration statement pursuant to Section 4 hereof.

     3. Securities Act Registration on Request.

          (a) Request. If at any time after March 31, 1998, the Company does not
make available to the Holders for any reason (other than an Excusable Reason)
the Shelf Registration statement contemplated by Section 2 hereof, one or more
Holders (the "Initiating Holders") may make a written request (the "Initiating
Request") to the Company for the registration with the Commission under the
Securities Act of all or part of such Initiating


                                       -3-
<PAGE>

Holders' Registrable Common Stock; provided, however, that such request shall be
made by one or more Holders of at least 10% of the outstanding shares of
Registrable Common Stock, which request shall specify the number of shares to be
disposed of and the proposed plan of distribution therefor. Upon the receipt of
any Initiating Request for registration pursuant to this paragraph, the Company
promptly shall notify in writing all other Holders of the receipt of such
request and will use its best efforts to effect, at the earliest possible date
(taking into account any delay that may result from any special audit required
by applicable law), such registration under the Securities Act, including a
Shelf Registration (if then eligible), of

               (i) the Registrable Common Stock which the Company has been so
     requested to register by such Initiating Holder, and

               (ii) all other Registrable Common Stock which the Company has
     been requested to register by any other Holders by written request given to
     the Company within 30 days after the giving of written notice by the
     Company to such other Holders of the Initiating Request,

all to the extent necessary to permit the disposition (in accordance with
Section 3(b) hereof) of the Registrable Common Stock so to be registered;
provided, that,

                    (A) if the intended method of distribution is an
          underwritten public offering, the Company shall not be required to
          effect such registration pursuant to this Section 3(a) unless such
          underwriting shall be conducted on a "firm commitment" basis,

                    (B) subject to the last sentence of Section 5 hereof, any
          Holder whose Registrable Common Stock was to be included in any such
          registration, by written notice to the Company, may withdraw such
          request and, on receipt of such notice of the withdrawal of such
          request from Holders holding a percentage of Common Stock, such that
          the Holders that have not elected to withdraw do not hold, in the
          aggregate, the requisite percentage of the Common Stock to initiate a
          request under this Section 3(a), the Company need not effect such
          registration, and

                    (C) the Company shall not be required to effect any
          registration to be effected pursuant to this Section 3(a) unless at
          least 10% of the shares of Registrable Common Stock outstanding at the
          time of such request is to be included in such registration.

          (b) Registration Statement Form. Registrations under Section 3(a)
hereof shall be on such appropriate registration form prescribed by the
Commission under the Securities Act as shall be selected by the Company and as
shall permit the disposition of the Registrable Common Stock pursuant to an
underwritten offering unless the Selling Holders holding at least a majority of
the shares of Registrable Common Stock requested to be included in such
registration statement determine otherwise, in which case pursuant to the method
of disposition determined by such Selling Holders. The Company agrees to include
in any such


                                      -4-
<PAGE>

registration statement filed pursuant to Section 3(a) hereof all information
which any Selling Holder, upon advice of counsel, shall reasonably request.

          (c) Effective Registration Statement. A registration requested
pursuant to Section 3(a) hereof shall not be deemed to have been effected

               (i) unless a registration statement with respect thereto has been
     declared effective by the Commission and remains effective in compliance
     with the provisions of the Securities Act and the laws of any state or
     other jurisdiction applicable to the disposition of all Registrable Common
     Stock covered by such registration statement until such time as all of such
     Registrable Common Stock have been disposed of in accordance with such
     registration statement,

               (ii) if, after it has become effective, such registration is
     interfered with by any stop order, injunction or other order or requirement
     of the Commission or other governmental or regulatory agency or court for
     any reason other than a violation of applicable law solely by the Selling
     Holders and has not thereafter become effective, or

               (iii) if, in the case of an underwritten offering, the conditions
     to closing specified in an underwriting agreement to which the Company is a
     party are not satisfied other than by reason of any breach or failure by
     the Selling Holders, or are not otherwise waived.

     The Holders of Registrable Common Stock to be excluded in a registration
statement may at any time terminate a request for registration made pursuant to
Section 3(a) in accordance with Section 3(a)(ii)(B). Expenses incurred in
connection with a request for registration terminated pursuant to this paragraph
shall be paid in accordance with the last sentence of Section 5 hereof.

          (d) Priority in Requested Registration. If a registration under
Section 3(a) hereof involves an underwritten public offering, and the managing
underwriter of such underwritten offering shall advise the Company in writing
(with a copy to each Holder requesting that Registrable Common Stock be included
in such registration statement) that, in its opinion, the number of shares of
Registrable Common Stock requested to be included in such registration exceeds
the number of such securities that can be sold in such offering within a price
range stated to such managing underwriter by Selling Holders owning at least a
majority of the shares of Registrable Common Stock requested to be included in
such registration to be acceptable to such Selling Holders, the Company shall
include in such registration, to the extent of the number and type of securities
which the Company is advised can be sold in such offering, all Registrable
Common Stock requested to be registered pursuant to Section 3(a) hereof, pro
rata among the Selling Holders on the basis of the number of shares of
Registrable Common Stock requested to be registered by all such holders, and no
other shares of Common Stock, whether to be sold by the Company or any other
Person.


                                       -5-
<PAGE>

          (e) Shelf Registrations. If a demand made pursuant to Section 3(a)
hereof is for a Shelf Registration, the period for which such Shelf Registration
must remain effective need not extend beyond the period set forth in Section
2(a) hereof or such shorter period which will terminate when all of the
Registrable Common Stock covered by the Shelf Registration has been sold
pursuant thereto.

          (f) Continuing Obligation to Register. No registration effected under
this Section 3 shall relieve the Company of its obligation to effect the Shelf
Registration under Section 2 hereof or of its obligation to permit the
registration of Registrable Common Stock under Section 4 hereof.

     4. Piggyback Registration. If at any time after March 31, 1998, the Company
does not make available to the Holders for any reason (other than an Excusable
Reason) the Shelf Registration statement contemplated by Section 2(a) hereof and
at any time proposes to register any of its securities under the Securities Act
by registration on any forms other than Form S-4 or S-8 (or any successor or
similar form(s)), whether or not pursuant to registration rights granted to
other holders of its securities and whether or not for sale for its own account,
it shall give prompt written notice to all of the Holders of its intention to do
so and of such Holders' rights (if any) under this Section 4, which notice, in
any event, shall be given at least 10 Business Days prior to such proposed
registration. Upon the written request of any Holder receiving notice of such
proposed registration that is a Holder of Registrable Common Stock (a
"Requesting Holder") made within 5 Business Days after the receipt of any such
notice (3 Business Days if the Company states in such written notice or gives
telephonic notice to the relevant securityholders, with written confirmation to
follow promptly thereafter, stating that (i) such registration will be on Form
S-3 and (ii) such shorter period of time is required because of a planned filing
date), which request shall specify the Registrable Common Stock intended to be
disposed of by such Requesting Holder and the minimum offering price per share
at which the Holder is willing to sell its Registrable Common Stock, the Company
shall, subject to Section 7(b) hereof, effect the registration under the
Securities Act of all Registrable Common Stock which the Company has been so
requested to register by the Requesting Holders thereof; provided, that,

                    (A) prior to the effective date of the registration
          statement filed in connection with such registration, promptly
          following receipt of notification by the Company from the managing
          underwriter of the price at which such securities are to be sold, the
          Company shall so advise the attorney-in-fact for the Requesting
          Holders of such price, and if such price is below the minimum price
          which any Requesting Holder shall have indicated to be acceptable to
          such Requesting Holder, such Requesting Holder shall then have the
          right irrevocably to withdraw its request to have its Registrable
          Common Stock included in such registration statement, by delivery of
          written notice of such withdrawal to the Company promptly but in any
          event before the execution of the underwriting agreement on behalf of
          such Holder, without prejudice to the rights of any Holder or Holders
          of Registrable Common Stock to include Registrable Common Stock in any
          future registration (or registrations) pursuant to this Section 4 or
          to cause


                                       -6-
<PAGE>

          such registration to be effected as a registration under Section 2 or
          Section 3(a) hereof, as the case may be;

                    (B) if at any time after giving written notice of its
          intention to register any securities and prior to the effective date
          of the registration statement filed in connection with such
          registration, the Company shall determine for any reason not to
          register or to delay registration of such securities, the Company may,
          at its election, give written notice of such determination to each
          Requesting Holder and (i) in the case of a determination not to
          register, shall be relieved of its obligation to register any
          Registrable Common Stock in connection with such registration (but not
          from any obligation of the Company to pay the Expenses in connection
          therewith), without prejudice, however, to the rights of any Holder to
          include Registrable Common Stock in any future registration (or
          registrations) pursuant to this Section 4 or to cause such
          registration to be effected as a registration under Section 2 or 3(a)
          hereof, as the case may be, and (ii) in the case of a determination to
          delay registering, shall be permitted to delay registering any
          Registrable Common Stock, for the same period as the delay in
          registering such other securities; and

                    (C) if such registration involves an underwritten offering,
          each Requesting Holder shall sell its Registrable Securities on the
          same terms and conditions as those that apply to the Company, if the
          Company is offering Common Stock.

     No registration effected under this Section 4 shall relieve the Company of
its obligation to effect any registration upon request under Section 3(a) hereof
or of its obligation to effect the Shelf Registration under Section 2 hereof.

     5. Expenses. The Company shall pay all Expenses in connection with any
registration initiated pursuant to Section 2(a), 3(a) or 4 hereof, whether or
not such registration shall become effective and whether or not all or any
portion of the Registrable Common Stock originally requested to be included in
such registration is ultimately included in such registration. Notwithstanding
the foregoing, if any request for registration made pursuant to Section 3(a)
hereof is withdrawn or terminated by the Selling Holders prior to the
registration becoming effective, the Expenses incurred in connection with such
request shall be borne by the Selling Holders pro rata on the basis of the
number of shares of Registrable Common Stock requested to be registered pursuant
to such demand by each Selling Holder, provided, however, that, in the case of
an underwritten Public Offering, if such request for registration is withdrawn
or terminated by the Selling Holders prior to the registration becoming
effective because the offering price of the Registrable Common Stock requested
to be registered would, in the opinion of the managing underwriter of such
offering, be less than 90% of the estimated offering price of the Common Stock
as indicated in writing by the managing underwriter prior to the initial filing
of such registration statement with the Commission, the Company shall pay 50% of
the Expenses in connection with such registration and the Selling Holders shall
pay the remaining 50% on a pro rata basis.


                                       -7-
<PAGE>

     6. Registration Procedures. If and whenever the Company is required to
effect any registration under the Securities Act as provided in Sections 2(a),
3(a) and 4 hereof, the Company shall, as expeditiously as possible:

          (a) subject to Section 6(c) hereof, prepare and file with the
Commission (promptly and, in the case of any registration pursuant to Section
3(a), in any event within 45 days) the requisite registration statement to
effect such registration and thereafter use its best efforts to cause such
registration statement to become effective; provided, however, that the Company
may discontinue any registration of its securities that are not shares of
Registrable Common Stock (and, under the circumstances specified in Section 4
hereof, its securities that are shares of Registrable Common Stock) at any time
prior to the effective date of the registration statement relating thereto;

          (b) notify each seller of Registrable Common Stock and other
securities covered by such registration statement at any time when a prospectus
relating thereto is required to be delivered under the Securities Act, upon
discovery that, or upon the happening of any event as a result of which, the
prospectus included in such registration statement, as then in effect, includes
an untrue statement of a material fact or omits to state any material fact
required to be stated therein or necessary to make the statements therein not
misleading in the light of the circumstances under which they were made, and
subject to Section 6(c) hereof, prepare and file with the Commission such
amendments and supplements to such registration statement and the prospectus
used in connection therewith as may be necessary to keep such registration
statement effective and to comply with the provisions of the Securities Act and
the Exchange Act with respect to the disposition of all Registrable Common Stock
covered by such registration statement until such time as all of such
Registrable Common Stock has been disposed of in accordance with the method of
disposition set forth in such registration statement;

          (c) before filing any registration statement or prospectus or any
amendments or supplements thereto, furnish to and afford the Holders of the
Registrable Common Stock, one firm of counsel for the Holders designated by the
Holders of a majority of the Registrable Common Stock included in the
registration statement (the "Holders Counsel") and the managing underwriters, if
any designated by the Holders, a reasonable opportunity to review copies of all
such documents (including copies of any documents to be incorporated by
reference therein and all exhibits thereto) proposed to be filed (at least ten
(10) Business Days prior to such filing). The Company shall not file any
registration statement or prospectus or any amendments or supplements thereto in
respect of which the Holders must be afforded an opportunity to review prior to
the filing of such document, if the Holders of a majority of the shares of
Registrable Common Stock covered by such registration statement, the Holders
Counsel, or the managing underwriters, if any, shall reasonably object. Any
registration statement, when declared effective by the Commission or when
subsequently amended (by an amendment which is declared effective by the
Commission) or any prospectus in the form included in the registration statement
as declared effective by the Commission or when subsequently supplemented will
not contain an untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading;


                                       -8-
<PAGE>

          (d) use its best efforts to obtain the prompt withdrawal of any order
suspending the effectiveness of a registration statement, and in any event
shall, within thirty (30) days of such cessation of effectiveness, use its best
efforts to amend the registration statement in a manner reasonably expected to
obtain the withdrawal of the order suspending the effectiveness thereof, or file
an additional registration statement pursuant to Rule 415 covering all of the
Registrable Common Stock and use its best efforts to cause the subsequent Shelf
Registration to be declared effective as soon as practicable after such filing
and to remain effective;

          (e) if requested by the managing underwriters, if any, or the Holders
of a majority of the Registrable Common Stock being sold in connection with an
underwritten offering, (i) promptly incorporate in a prospectus supplement or
post-effective amendment such information as the managing underwriters, if any,
or such Holders or counsel reasonably request to be included therein, (ii) make
all required filings of such prospectus supplement or such post-effective
amendment as soon as practicable after the Company has received notification of
the matters to be incorporated in such prospectus supplement. or post-effective
amendment, and (iii) supplement or make amendments to such registration
statement;

          (f) furnish to each seller of Registrable Common Stock covered by such
registration statement such number of copies of such drafts and final conformed
versions of such registration statement and of each such amendment and
supplement thereto (in each case including all exhibits and any documents
incorporated by reference), such number of copies of such drafts and final
versions of the prospectus contained in such registration statement (including
each preliminary prospectus and any summary prospectus) and any other prospectus
filed under Rule 424 under the Securities Act, in conformity with the
requirements of the Securities Act, and such other documents, as such seller may
reasonably request in writing;

          (g) use its best efforts (i) to register or qualify all Registrable
Common Stock under such other securities or blue sky laws of such states or
other jurisdictions of the United States of America as the sellers of
Registrable Common Stock covered by such registration statement shall reasonably
request in writing, (ii) to keep such registration or qualification in effect
for so long as such registration statement remains in effect, (iii) to prevent
the issuance of any order suspending the effectiveness of a registration
statement or of any order preventing or suspending the use of a prospectus or
suspending the qualification (or exemption from qualification) of any of the
Registrable Common Stock for sale in any jurisdiction, and, if any such order is
issued, to use its best efforts to obtain the withdrawal of any such order at
the earliest possible moment, and (iv) to take any other action that may be
reasonably necessary or advisable to enable such sellers to consummate the
disposition in such jurisdictions of the securities to be sold by such sellers,
except that the Company shall not for any such purpose be required to qualify
generally to do business as a foreign corporation in any jurisdiction wherein it
would not but for the requirements of this subsection (g) be obligated to be so
qualified, to subject itself to taxation in such jurisdiction or to consent to
general service of process in any such jurisdiction;

          (h) use its best efforts to cause all Registrable Common Stock and
other securities covered by such registration statement to be registered with or
approved by such


                                       -9-
<PAGE>

other federal or state governmental agencies or authorities as may be necessary
in the opinion of counsel to the Company and counsel to the seller or sellers of
Registrable Common Stock to enable the seller or sellers thereof to consummate
the disposition of such Registrable Common Stock in the manner set forth in the
registration statement;

          (i) in connection with any underwritten offering, use its best efforts
to obtain and, if obtained, furnish to each seller of Registrable Common Stock,
and each such seller's underwriters, if any, a signed

               (i) opinion of counsel for the Company, dated the date of the
     closing under the underwriting agreement, reasonably satisfactory in form
     and substance to the Holders Counsel, and

               (ii) "comfort" letter, dated the effective date of such
     registration statement and signed by the independent public accountants who
     have certified the Company's financial statements included or incorporated
     by reference in such registration statement, reasonably satisfactory in
     form and substance to the Holders Counsel,

in each case, covering substantially the same matters with respect to such
registration statement (and the prospectus included therein) and, in the case of
the accountants' comfort letter, with respect to events subsequent to the date
of such financial statements, as are customarily covered in opinions of issuer's
counsel and in accountants' comfort letters delivered to underwriters in
underwritten public offerings of securities and, in the case of the accountants'
comfort letter, such other financial matters, and, in the case of the legal
opinion, such other legal matters, as the sellers of the Registrable Common
Stock covered by such registration statement or the underwriters, if any, may
reasonably request;

          (j) otherwise comply with all applicable rules and regulations of the
Commission and any other governmental agency or authority having jurisdiction
over the offering, and make available to its security holders, as soon as
reasonably practicable, an earnings statement covering the period of at least
twelve months, but not more than eighteen months, beginning with the first full
calendar month after the effective date of such registration statement, which
earnings statement shall satisfy the provisions of Section 11(a) of the
Securities Act and Rule 158 promulgated thereunder, and furnish to each seller
of Registrable Common Stock at least ten days prior to the filing thereof a copy
of any amendment or supplement to such registration statement or prospectus;

          (k) use its best efforts to cause all such Registrable Common Stock
covered by such registration statement (i) to be listed on the Exchange, if the
listing of such Registrable Common Stock is then permitted under the rules
thereof or (ii) if the Company is not required pursuant to clause (i) above to
list such securities covered by such registration statement on such Exchange,
use its best efforts to secure designation of all Registrable Common Stock
covered by such registration statement as a NASDAQ "national market system
security" within the meaning of Rule 11Aa2-l of the Commission or, failing that,
to secure NASDAQ authorization for such Registrable Common Stock and, without
limiting the generality of the


                                      -10-
<PAGE>

foregoing, to arrange for at least two market makers to register with the NASD
as such with respect to such Registrable Common Stock;

          (1) file all annual and quarterly reports required by the Exchange
Act, and, in the event that the Company is no longer subject to the reporting
requirements of the Exchange Act, file the reports required to be filed by it
under the Exchange Act and the rules and regulations adopted by the Commission
thereunder in the same manner as if it were subject to such reporting
requirements; and

          (m) provide a transfer agent for such Registrable Common Stock covered
by such Registration Statement no later than the effective date thereof (which
transfer agent shall also maintain the share register for the Common Stock).

     The Company may require each seller of Registrable Common Stock as to which
any registration is being effected to furnish the Company such information
regarding such seller and the distribution of the securities covered by such
registration statement as the Company may from time to time reasonably request
in writing and as is required by applicable laws and regulations.

     Each Holder agrees that as of the date that a final prospectus is made
available to it for distribution to prospective purchasers of Registrable Common
Stock it shall cease to distribute copies of any preliminary prospectus prepared
in connection with the offer and sale of such Registrable Common Stock. Each
Holder further agrees that, upon receipt of any notice from the Company of the
happening of any event of the kind described in subsection (b) of this Section
6, such Holder shall forthwith discontinue such Holder's disposition of
Registrable Common Stock pursuant to the registration statement relating to such
Registrable Common Stock until such Holder's receipt of the copies of the
supplemented or amended prospectus contemplated by subsection (b) of this
Section 6 and, if so directed by the Company, shall deliver to the Company (at
the Company's expense) all copies, other than permanent file copies, then in
such Holder's possession of the prospectus relating to such Registrable Common
Stock current at the time of receipt of such notice.

     7. Underwritten Offerings.

          (a) Underwriting Agreement. In the event of an underwritten offering
of Registrable Common Stock, the Company shall enter into an underwriting
agreement as is customary in underwritten offerings and take all such other
actions as are reasonably requested by the managing underwriters in order to
expedite or facilitate the registration or the disposition of such Registrable
Common Stock, and in such connection, (i) make such representations and
warranties to the underwriters, with respect to the business of the Company and
its subsidiaries and the registration statement, prospectus and documents, if
any, incorporated or deemed to be incorporated by reference therein, in each
case, as is reasonable, and (ii) include in such underwriting agreement
indemnification provisions and procedures no less favorable than those set forth
in Section 9 of this Agreement (or such other provisions and procedures
acceptable to Holders of a majority in aggregate principal amount of Registrable
Common Stock covered by such Registration Statement and the managing
underwriters or agents) with respect to all parties


                                      -11-
<PAGE>

to be indemnified pursuant to said Section. The above shall be done at each
closing under such underwriting agreement, or as and to the extent required
thereunder.

          (b) Piggyback Underwritten Offerings; Priority. If the Company
proposes to register any of its securities under the Securities Act as
contemplated by Section 4 hereof and such securities are to be distributed by or
through one or more underwriters, the Company shall, if requested by any
Requesting Holders, use its best efforts to arrange for such underwriters to
include all of the Registrable Common Stock to be offered and sold by such
Requesting Holders among the securities of the Company to be distributed by such
underwriters; provided, that, if the managing underwriter of such underwritten
offering shall advise the Company in writing (with a copy to the Requesting
Holders) that if all the Registrable Common Stock requested to be included in
such registration (together with all other shares of Common Stock of other
stockholders of the Company requested to be so included pursuant to "piggyback'
rights granted to such stockholders) were so included, in its opinion, the
number and type of securities proposed to be included in such registration would
exceed the number and type of securities which could be sold in such offering
within a price range acceptable to the Company (such writing to state the basis
of such opinion and the approximate number and type of securities which may be
included in such offering without such effect), then the Company shall include
in such registration, to the extent of the number and type of securities which
the Company is so advised can be sold in such offering, (i) first, securities
that the Company proposes to issue and sell for its own account and (ii) second,
Registrable Common Stock requested to be registered by Requesting Holders
pursuant to Section 4 hereof and Common Stock of any other stockholders of the
Company requesting registration as aforesaid, pro rata, among such holders on
the basis of the number of shares of Common Stock requested to be registered by
all such holders.

     Any Requesting Holder may withdraw its request to have all or any portion
of its Registrable Common Stock included in any such offering by notice to the
Company within 1O Business Days after receipt of a copy of a notice from the
managing underwriter pursuant to this section 7(b).

          (c) Holders of Registrable Common Stock to be Parties to Underwriting
Agreement. The Holders of Registrable Common Stock to be distributed by
underwriters in an underwritten offering contemplated by subsections (a) or (b)
of this Section 7 shall be parties to the underwriting agreement between the
Company and such underwriters and any such Holder, at its option, may require
that any or all of the representations and warranties by, and the other
agreements on the part of, the Company to and for the benefit of such
underwriters shall also be made to and for the benefit of such Holders and that
any or all of the conditions precedent to the obligations of such underwriters
under such underwriting agreement be conditions precedent to the obligations of
such Holders. No such Holder shall be required to make any representations or
warranties to or agreements with the Company or the underwriters except that
each such Holder shall be required to make representations, warranties and
agreements regarding such Holder, such Holder's Registrable Common Stock and
such Holder's intended method of distribution. The Selling Holders shall appoint
an attorney-in-fact who shall


                                      -12-
<PAGE>

be authorized to negotiate with the underwriter on behalf of the Selling Holders
and to execute the underwriting agreement and related documentation on their
behalf.

          (d) Selection of Underwriters for Underwritten Offering. The
underwriter or underwriters of each underwritten offering, if any, of the
Registrable Common Stock to be registered pursuant to Section 2(a) or 3(a)
hereof (i) shall be a nationally recognized underwriter (or underwriters), (ii)
shall be selected by the Selling Holders owning at least a majority of the
shares of Registrable Common Stock to be registered and (iii) shall be
reasonably acceptable to the Company. The underwriter or underwriters of each
piggyback underwritten offering pursuant to Section 4 shall be a nationally
recognized underwriter (or underwriters) selected by the Company.

     8. Preparation; Reasonable Investigation.

          (a) Registration Statements. In connection with the preparation and
filing of each registration statement under the Securities Act pursuant to this
Agreement, the Company shall give each Holder of Registrable Common Stock
registered under such registration statement, the underwriter, if any, and its
respective counsel and accountants the reasonable opportunity to participate in
the preparation of such registration statement, each prospectus included therein
or filed with the Commission, and each amendment thereof or supplement thereto,
and shall give each of them such reasonable access to its books and records and
such reasonable opportunities to discuss the business of the Company with its
officers and the independent public accountants who have certified its financial
statements as shall be necessary, in the reasonable opinion of any such Holders'
and such underwriters' respective counsel, to conduct a reasonable investigation
within the meaning of the Securities Act.

          (b) Confidentiality. Each Holder of Registrable Common Stock shall
maintain the confidentiality of any confidential information received from or
otherwise made available by the Company to such Holder of Registrable Common
Stock and identified in writing by the Company as confidential. Information that
(i) is or becomes available to a Holder of Registrable Common Stock from a
public source, (ii) is disclosed to a Holder of Registrable Common Stock by a
third-party source who the Holder of Registrable Common Stock reasonably
believes has the right to disclose such information or (iii) is or becomes
required to be disclosed by a Holder of Registrable Common Stock by law,
including by court order, shall not be deemed to be confidential information for
purposes of this Agreement. 

     9. Indemnification.

          (a) Indemnification by the Company. In connection with any
registration statement filed by the Company pursuant to Section 2(a), 3(a) or 4
hereof, the Company shall, and hereby agrees to, indemnify and hold harmless,
each Holder and seller of any Registrable Common Stock covered by such
registration statement and each other Person who participates as an underwriter
in the offering or sale of such securities and each other Person, if any, who
controls such Holder or seller or any such underwriter, and their respective
directors, officers, partners, agents and Affiliates (each, a "Company
Indemnitee" for purposes of this Section 9(a)), against any losses, claims,
damages, liabilities (or actions or proceedings,


                                      -13-
<PAGE>

whether commenced or threatened, in respect thereof and whether or not such
Indemnified Party is a party thereto), joint or several, and expenses,
including, without limitation, the reasonable fees, disbursements and other
charges of one legal counsel for all of such Company Indemnitees (which counsel
shall be reasonably acceptable to all such Company Indemnitees) and reasonable
costs of investigation, to which such Company Indemnitee may become subject
under the Securities Act or otherwise (collectively, a "Loss" or "Losses"),
insofar as such Losses arise out of or are based upon any untrue statement or
alleged untrue statement of any material fact contained in any registration
statement under which such securities were registered or otherwise offered or
sold under the Securities Act or otherwise, any preliminary prospectus, final
prospectus or summary prospectus contained therein, or any amendment or
supplement thereto (collectively, "Offering Documents"), or any omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein in the light of the circumstances in
which they were made not misleading; provided, that, the Company shall not be
liable in any such case to the extent that any such Loss arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission made in such Offering Documents in reliance upon and in
conformity with written information furnished to the Company through an
instrument duly executed by or on behalf of such Company Indemnitee specifically
stating that it is expressly for use therein; and provided, further, that the
Company shall not be liable to any Person who participates as an underwriter in
the offering or sale of Registrable Common Stock or any other Person, if any,
who controls such underwriter, in any such case to the extent that any such Loss
arises out of such Person's failure to send or give a copy of the final
prospectus (including any documents incorporated by reference therein), as the
same may be then supplemented or amended, to the person asserting an untrue
statement or alleged untrue statement or omission or alleged omission at or
prior to the written confirmation of the sale of Registrable Common Stock to
such Person if such statement or omission was corrected in such final
prospectus. Such indemnity shall remain in full force and effect regardless of
any investigation made by or on behalf of such Company Indemnitee and shall
survive the transfer of such securities by such Company Indemnitee.

          (b) Indemnification by the Offerors and Sellers. In connection with
any registration statement filed by the Company pursuant to Section 2(a), 3(a)
or 4 hereof in which a Holder has registered for sale Registrable Common Stock,
each such Holder or seller of Registrable Common Stock shall, and hereby agrees
to, indemnify and hold harmless the Company and each of its directors, officers,
employees and agents, each other Person, if any, who controls the Company and
each other seller and such seller's directors, officers, stockholders, partners,
employees, agents and affiliates (each, a "Holder Indemnitee" for purposes of
this Section 9(b)), against all Losses insofar as such Losses arise out of or
are based upon any untrue statement or alleged untrue statement of a material
fact contained in any Offering Documents (or any document incorporated by
reference therein) or any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein in the light of circumstances in which they were made not misleading, if
such untrue statement or alleged untrue statement or omission or alleged
omission was made in reliance upon and in conformity with written information
furnished to the Company through an instrument duly executed by such Holder or
seller of Registrable Common Stock specifically stating that it is expressly for
use therein; provided, however, that the liability of such


                                      -14-

<PAGE>

indemnifying party under this Section 9(b) shall be limited to the amount of the
net proceeds received by such indemnifying party in the offering giving rise to
such liability. Such indemnity shall remain in full force and effect, regardless
of any investigation made by or on behalf of the Holder Indemnitee and shall
survive the transfer of such securities by such Holder.

          (c) Notices of Losses, etc. Promptly after receipt by an indemnified
party of notice of the commencement of any action or proceeding involving a Loss
referred to in the preceding subsections of this Section 9, such indemnified
party will, if a claim in respect thereof is to be made against an indemnifying
party, give written notice to the latter of the commencement of such action;
provided, however, that the failure of any indemnified party to give notice as
provided herein shall not relieve the indemnifying party of its obligations
under the preceding subsections of this Section 9, except to the extent that the
indemnifying party is actually prejudiced by such failure to give notice. In
case any such action is brought against an indemnified party, the indemnifying
party shall be entitled to participate in and, unless in such indemnified
party's reasonable judgment a conflict of interest between such indemnified and
indemnifying parties may exist in respect of such Loss, to assume and control
the defense thereof, in each case at its own expense, jointly with any other
indemnifying party similarly notified, to the extent that it may wish, with
counsel reasonably satisfactory to such indemnified party, and after its
assumption of the defense thereof, the indemnifying party shall not be liable to
such indemnified party for any legal or other expenses subsequently incurred by
the latter in connection with the defense thereof other than reasonable costs of
investigation. No indemnifying party shall be liable for any settlement of any
such action or proceeding effected without its written consent, which shall not
be unreasonably withheld. No indemnifying party shall, without the consent of
the indemnified party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such indemnified party of a release from all
liability in respect of such Loss or which requires action on the part of such
indemnified party or otherwise subjects the indemnified party to any obligation
or restriction to which it would not otherwise be subject

          (d) Contribution. If the indemnification provided for in this Section
9 shall for any reason be unavailable to an indemnified party under subsection
(a) or (b) of this Section 9 in respect of any Loss, then, in lieu of the
amount paid or payable under subsection (a) or (b) of this Section 9, the
indemnified party and the indemnifying party under subsection (a) or (b) of this
Section 9 shall contribute to the aggregate Losses (including legal or other
expenses reasonably incurred in connection with investigating the same) (i) in
such proportion as is appropriate to reflect the relative fault of the Company
and the prospective sellers of Registrable Common Stock covered by the
registration statement which resulted in such Loss or action in respect thereof,
with respect to the statements, omissions or action which resulted in such Loss
or action in respect thereof, as well as any other relevant equitable
considerations, or (ii) if the allocation provided by clause (i) above is not
permitted by applicable law, in such proportion as shall be appropriate to
reflect the relative benefits received by the Company, on the one hand, and such
prospective sellers, on the other hand, from their sale of Registrable Common
Stock; provided, that, for purposes of this clause (ii), the relative benefits
received by the prospective sellers shall be deemed not to exceed the amount
received by such sellers. No Person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the Securities Act) shall be


                                      -15-
<PAGE>

entitled to contribution from any Person who was not guilty of such fraudulent
misrepresentation. The obligations, if any, of the Selling Holders of
Registrable Common Stock to contribute as provided in this subsection (d) are
several in proportion to the relative value of their respective Registrable
Common Stock covered by such registration statement and not joint. In addition,
no Person shall be obligated to contribute hereunder any amounts in payment for
any settlement of any action or Loss effected without such Personal consent.

          (e) Other Indemnification. The Company and, in connection with any
registration statement filed by the Company pursuant to Section 2(a) each Holder
shall, and, in connection with any registration statement filed by the Company
pursuant to Section 3(a) or 4, each Holder who has registered for sale
Registrable Common Stock, shall, with respect to any required registration or
other qualification of securities under any Federal or state law or regulation
of any governmental authority other than the Securities Act, indemnify Holder
indemnitees and Company Indemnitees, respectively, against Losses, or, to the
extent that indemnification shall be unavailable to a Holder Indemnitee or
Company Indemnitee, contribute to the aggregate Losses of such Holder Indemnitee
or Company Indemnitee in a manner similar to that specified in the preceding
subsections of this Section 9 (with appropriate modifications), provided, that,
the Holder shall be liable only if and to the extent that such Loss arises out
of or is based upon written information furnished to the Company through an
instrument duly executed by or on behalf of such Holder specifically stating
that it is expressly for use in connection with such registration or
qualification; and provided, further, that the aggregate liability of such
Holder under this Section 9 shall be limited to the amount of the net proceeds
received by such Holder in the offering giving rise to such liability.

          (f) Indemnification Payments. The indemnification and contribution
required by this Section 9 shall be made by periodic payments of the amount
thereof during the course of any investigation or defense, as and when bills are
received or any Loss is incurred.

     10. Registration Rights to Others. If the Company shall at any time
hereafter provide to any holder of any securities of the Company rights with
respect to the registration of such securities under the Securities Act or the
Exchange Act, such rights shall not be in conflict with or adversely affect any
of the rights provided in this Agreement to the Holders of Registrable Common
Stock.

     11. Adjustments Affecting Registrable Common Stock. The Company shall not
effect or permit to occur any combination, subdivision or reclassification of
Registrable Common Stock that would materially adversely affect the ability of
the Holders to include such Registrable Common Stock in any registration of its
securities under the Securities Act contemplated by this Agreement or the
marketability of such Registrable Common Stock under any such registration or
other offering.

     12. Rule 144 and Rule 144A. The Company shall take all actions required to
be taken on the part of the Company in order to enable Holders to sell
Registrable Common Stock without registration under the Securities Act within
the limitation of the exemptions provided by (a) Rule 144 under the Securities
Act, as such Rule may be amended from time to


                                      -16-
<PAGE>

time, (b) Rule 144A under the Securities Act, as such Rule may be amended from
time to time, or (c) any similar rules or regulations hereafter adopted by the
Commission, including, without limiting the generality of the foregoing, filing
on a timely basis all reports required to be filed under the Exchange Act. Upon
the request of any Holder, the Company shall deliver to such Holder a written
statement as to whether it has complied with such requirements.

     13. Amendments and Waivers. Any provision of this Agreement may be amended,
modified or waived if, but only if, the written consent to such amendment,
modification or waiver has been obtained from (i) except as provided in clause
(ii) below, the Holder or Holders of at least 66-2/3% of the shares of
Registrable Common Stock affected by such amendment, modification or waiver and
(ii) in the case of any amendment, modification or waiver of any provision of
Section 5 hereof or this Section 13, or as to the percentages of Holders
required for any amendment, modification or waiver, or any amendment,
modification or waiver which adversely affects any right and/or obligation under
this Agreement of any Holder, the written consent of each Holder so affected.

     14. Nominees for Beneficial Owners. In the event that any Registrable
Common Stock is held by a nominee for the beneficial owner thereof, the
beneficial owner thereof may, at its election in writing delivered to the
Company, be treated as the Holder of such Registrable Common Stock for purposes
of any request or other action by any Holder or Holders pursuant to this
Agreement or any determination of the number or percentage of shares of
Registrable Common Stock held by any Holder or Holders contemplated by this
Agreement. If the beneficial owner of any Registrable Common Stock so elects,
the Company may require assurances reasonably satisfactory to it of such owner's
beneficial ownership of such Registrable Common Stock.

     15. Assignment. The provisions of this Agreement shall be binding upon and
inure to the benefit of the parties hereto and their respective heirs,
successors and permitted assigns. Any Holder may assign to any Transferee of its
Registrable Common Stock its rights and obligations under this Agreement (except
with respect to shares of Registrable Common Stock sold pursuant to Rule 144
under the Securities Act, under any registration statement or otherwise in a
manner such that the shares are no longer subject to restrictions from further
public resale under the Securities Act without regard to volume limitations),
provided that the Company shall receive written notice of such transfer and that
such Transferee shall agree in writing with the parties hereto prior to the
assignment to be bound by this Agreement as if it were an original party hereto,
whereupon such assignee shall for all purposes be deemed to be a Holder under
this Agreement. Except as provided above or otherwise permitted by this
Agreement, neither this Agreement nor any right, remedy, obligation or liability
arising hereunder or by reason hereof shall be assignable by any Holder without
the prior written consent of the other parties hereto. The Company may not
assign this Agreement or any right, remedy, obligation or liability arising
hereunder or by reason hereof.

     16. Calculation of Percentage or Number of Shares of Registrable Common
Stock. For purposes of this Agreement, all references to percentage or number of
shares of Registrable Common Stock or Common Stock shall be calculated based
upon the number of


                                      -17-
<PAGE>

shares of Registrable Common Stock or Common Stock, as the case may be,
outstanding at the time such calculation is made and shall exclude any
Registrable Common Stock or Common Stock, as the case may be, owned by the
Company or any subsidiary of the Company.

     17. Miscellaneous.

          (a) Further Assurances. Each of the parties hereto shall execute such
documents and other papers and perform such further acts as may be reasonably
required or desirable to carry out the provisions of this Agreement and the
transactions contemplated hereby.

          (b) Headings. The headings in this Agreement are for convenience of
reference only and shall not control or affect the meaning or construction of
any provisions hereof.

          (c) No Inconsistent Agreements. The Company will not hereafter enter
into any agreement which is inconsistent with the rights granted to the Holders
in this Agreement.

          (d) Remedies. Each Holder, in addition to being entitled to exercise
all rights granted by law, including recovery of damages, will be entitled to
specific performance of its rights under this Agreement. The Company agrees that
monetary damages would not be adequate compensation for any loss incurred by
reason of a breach by it of the provisions of this Agreement and the Company
hereby agrees to waive the defense in any action for specific performance that a
remedy at law would be adequate.

          (e) Entire Agreement. This Agreement constitutes the entire agreement
and understanding of the parties hereto in respect of the subject matter
contained herein, and there are no restrictions, promises, representations,
warranties, covenants, or undertakings with respect to the subject matter
hereof, other than those expressly set forth or referred to herein. This
Agreement supersedes all prior agreements and understandings between the parties
hereto with respect to the subject matter hereof.

          (f) Notices. Any notices or other communications to be given hereunder
by any party to another party shall be in writing, shall be delivered
personally, by telecopy, by certified or registered mall, postage prepaid,
return receipt requested, or by Federal Express or other comparable delivery
service, in the case of a Holder, to the address of such Holder as shown on the
Company's shareholder records, and in the case of the Company, as follows:


                                      -18-
<PAGE>

Porta Systems Corp.
575 Underhill Blvd.
Syosset, NY l1791
Attention:  Mr. William V. Carney
            Chairman of the Board and Chief Executive Officer
                     -and-
            Mr. Edward B. Kornfeld 
            Chief Financial Officer

Tel: 516 364-93O0
Fax: 516 682-4655

with a copy to:

Esanu Katsky Korins & Siger, LLP
605 Third Avenue
New York, NY 10158
Attention: Warren H. Esanu, Esq.

Tel: 212 953-6000
Fax: 212 953-6899

Notice shall be effective when delivered if given personally, when receipt is
acknowledged if telecopied, three Business Days after mailing if given by
registered or certified mail as described above, and one Business Day after
deposit if given by Federal Express or comparable delivery service.

          (g) Governing Law. This Agreement shall be governed by and construed
in accordance with the laws of the State of New York applicable to agreements
made to be performed entirely in such State. Any action against the Company may
be brought solely in the Federal or State Courts located in New York County, New
York.

          (h) Severability. Notwithstanding any provision of this Agreement,
neither the Company nor any other party hereto shall be required to take any
action which would be in violation of any applicable Federal or state securities
law. The invalidity or unenforceability of any provision of this Agreement in
any jurisdiction shall not affect the validity, legality or enforceability of
any other provision of this Agreement in such jurisdiction or the validity,
legality or enforceability of this Agreement, including any such provision, in
any other jurisdiction, it being intended that all rights and obligations of the
parties hereunder shall be enforceable to the fullest extent permitted by law.

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


                                      -19-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.

                                      PORTA SYSTEMS CORP.

                                      By:  /s/ EDWARD B. KORNFELD
                                          ---------------------------------
                                          Name:  Edward B. Kornfeld
                                          Title: Senior Vice president
                                                 Chief Financial Officer


                                      -20-


                                                                     Exhibit 4.7

                [Letterhead of Arnhold and S. Bleichroeder, Inc.]

                                                                     May 1, 1997

Mr. William V. Carney
Chairman of the Board and Chief Executive Officer
Porta Systems Corp.
575 Underhill Boulevard
Syosset, NY 11791

Dear Bill:

      Arnhold and S. Bleichroeder,  Inc. ("A&SB") is pleased to act as financial
advisor to Porta Systems Corp. ("Porta" or the "Company")  rendering  investment
banking  services in  connection  with  transactions  the Company may  undertake
including  restructuring  existing  debt  obligations  of the  Company,  capital
raising and mergers and  acquisitions  (together the  "Possible  Transactions").
This letter is to confirm our understanding  with respect to our engagement (the
"Letter Agreement").

      A&SB will assist the Company in analyzing,  structuring,  negotiating  and
effecting the Possible  Transactions on the terms and conditions of this letter.
In this  regard,  we propose to  undertake  certain  activities  on your behalf,
including, if appropriate, the following:

     (1)  negotiating  with the holders of the Company's Zero Coupon  Debentures
          regarding the restructuring of such obligations;

     (2)  assisting  the  Company  in the  refinancing  of debt due to  Foothill
          Capital;

     (3)  advising the Company in the  negotiations  and as to the structure and
          form of the Possible Transactions;

     (4)  rendering  such  other  financial   advisory  and  investment  banking
          services as may time to time be agreed upon by A&SB and the Company.

       MEMBER OF THE NEW YORK STOCK EXCHANGE AND OTHER PRINCIPAL EXCHANGES

<PAGE>

                                       -2-


      It is understood that A&SB makes no commitment to underwrite the Company's
debt or equity securities. In addition, Porta has the right not to accept any or
all offers with respect to the Possible Transactions.

      As  compensation  for these advisory  services,  the Company agrees to pay
A&SB as follows:

      (i) For general advisory services, 50,000 five-year warrants per annum for
          two years with an exercise price equal to $1.56,  the closing price of
          Porta's  common  stock on April 30,  1997.  These  warrants  will vest
          immediately upon execution of this Letter Agreement.

     (ii) Upon the completion of a restructuring of the Zero Coupon  Debentures,
          300,000  five-year  warrants  with an  exercise  price equal to $1.56.
          These warrants will vest immediately upon issuance.

          In the event that (a) at least 33% of the Zero Coupon  Debentures  are
          not  converted  into  common  stock,  preferred  stock  or some  other
          equity-like  security,  or  (b)  at  least  33%  of  the  Zero  Coupon
          Debentures  are not forgiven by such holders,  A&SB shall receive only
          100,000 warrants under (ii) above.

    (iii) Upon the  completion of the  refinancing  of Foothill  Capital's  debt
          obligations  with a new lender,  100,000  five-year  warrants  with an
          exercise price equal to $1.56.  These  warrants will vest  immediately
          upon issuance.

     (iv) Upon  consummation  of other  Possible  Transactions  (excluding (i) -
          (iii)  above),  A&SB  shall  be paid  fees  at  normal  and  customary
          investment  banking  rates,  to be  agreed  upon  in  separate  Letter
          Agreements between the Company and A&SB.

      All warrants  received by A&SB as  compensation  for its  services,  shall
contain customary terms including  anti-dilution  (not including dilution due to
(i) - (iii) above) and cashless exercise  provisions  (whereby A&SB will receive
stock based upon the  difference  between the exercise price and market price of
the Company's stock) provisions and appropriate registration rights.

      In  addition  to any fees that may be payable  to A&SB  under this  Letter
Agreement, the Company agrees to reimburse A&SB, upon request from time to time,
for its reasonable  out-of-pocket  expenses  incurred in connection  with A&SB's
activities under this Letter Agreement.

      In connection with A&SB's  engagement,  the Company will furnish A&SB with
all

<PAGE>

                                      -3-


information  concerning the Company which A&SB reasonably deems  appropriate and
will provide A&SB with access to the Company's officers, directors,  accountants
and  counsel,  it being  understood  that A&SB  will rely upon such  information
supplied by the  Company and its  officers  and agents  without any  independent
investigation or verification thereof. All non-public information concerning the
Company  which  is  given  to A&SB  will be used  solely  in the  course  of the
performance of our services  hereunder and will be treated  confidentially by us
for so long as it remains non-public.  Except as otherwise required by law, A&SB
will not  disclose  this  information  to a third party  without  the  Company's
consent.  If A&SB is required by a court of competent  jurisdiction  to disclose
any such information, it shall notify, to the extent consistent with the court's
order, the Company at least 5 days before making any such disclosure.

      The  Company  agrees  to  indemnify  A&SB  and its  affiliates  and  their
respective directors,  officers, employees, agents and controlling persons (A&SB
and each  person  being an  "Indemnified  Party")  from and  against any and all
losses,  claims,  damages  and  liabilities,  joint and  several,  to which such
Indemnified Party may become subject under any applicable  federal or state law,
or otherwise, related to or arising out of any business transaction contemplated
by this  Letter  Agreement  or the  engagement  of  A&SB  pursuant  to,  and the
performance by A&SB of the services  contemplated  by, this Letter Agreement and
will  reimburse any  Indemnified  Party for all expenses  (including  reasonable
counsel  fees  and  expenses)  as they  are  incurred  in  connection  with  the
investigation of,  preparation for or defense of any pending or threatened claim
or any action or proceeding arising  therefrom,  whether or not such Indemnified
Party  is  a  party.  The  Company  will  not  be  liable  under  the  foregoing
indemnification  provision to the extent that any loss, claim, damage, liability
or expense is found in a final  judgment by a court to have  resulted  primarily
from  A&SB's  bad faith or gross  negligence,  provided  however,  selection  of
counsel shall be subject to reasonable approval of the Company.

      The  indemnification  provided  for in this Letter  Agreement  shall be in
addition to any rights that either party may have at common law or otherwise.

      This  engagement  shall cease upon  termination of this Letter  Agreement,
which may be effected by agreement of the parties  hereto any time and by either
party upon 30 days' prior written notice,  such notice which may be given at any
time.  Provisions  relating to indemnification  and out-of-pocket  expenses will
survive  any  termination,  and the  provisions  relating to the payment of fees
described on page 2 of this Letter Agreement will survive such termination for a
period of 6 months.

<PAGE>

                                      -4-


      Please confirm that the foregoing is in accordance with your understanding
by signing and returning to us the enclosed duplicate of this letter.

                                Very truly yours,

                                ARNOLD AND S. BLEICHROEDER, INC.

                                By:/s/ Gary L. Fuhrman
                                   ------------------------------------- 
                                       Gary L. Fuhrman
                                       Co-Director of Investment Banking

Accepted:

PORTA SYSTEMS CORP.

By:/s/ William V. Carney
   ----------------------------------------
       William V. Carney
       Chairman and Chief Executive Officer



                                                                     Exhibit 4.8

                                                             Warrant to Purchase
WA-                                                              **       **
                                                          Shares of Common Stock

NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK  ISSUABLE  UPON  EXERCISE OF
THIS WARRANT HAVE BEEN REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
AND NEITHER  THIS WARRANT NOR SUCH SHARES MAY BE SOLD,  ENCUMBERED  OR OTHERWISE
TRANSFERRED  EXCEPT PURSUANT TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER SUCH
ACT OR AN EXEMPTION  FROM SUCH  REGISTRATION  REQUIREMENT,  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 ________, ____

                     SERIES A COMMON STOCK PURCHASE WARRANT
                                       OF
                               PORTA SYSTEMS CORP.

     This is to certify that, FOR VALUE RECEIVED,  Arnhold and S.  Bleichroeder,
Inc. or registered assigns ("Holder"), is entitled to purchase, on the terms and
subject to the provisions of this Warrant,  from Porta Systems Corp., a Delaware
corporation  (the  "Company"),  at an exercise price per share of one and 56/100
dollars ($1.56),  ___________________________  shares of common stock, par value
$.01 per share  ("Common  Stock"),  of the Company 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 at 5:00
P.M. New York City time, on ________, ____; 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  number of shares of Common  Stock to be issued  upon the  exercise  of this
Warrant  and the  price to be paid for a share of Common  Stock may be  adjusted
from time to time in the manner set forth in this Warrant.  The shares of Common
Stock  deliverable  upon such  exercise,  and as adjusted from time to time, are
hereinafter  sometimes  referred to as "Warrant  Shares," and the exercise price
for the purchase of a share of Common  Stock  pursuant to this  Warrant,  as the
same may be adjusted from time to time is hereinafter  sometimes  referred to as
the "Exercise  Price." Reference in the Warrant to the "Series A Warrants" shall
mean any or all of the warrants  designated  as Series A Common  Stock  Purchase
Warrants by the Company.

     (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 of this Warrant
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 shares of Common
Stock  specified in such form.  Payment of the Exercise Price may be made either
by check  (subject  to  collection)  in the amount of the  Exercise  Price or by
delivery  of such  number  of shares  of  Common  Stock as has a current  value,
determined in the manner provided for in Paragraph  (a)(2) of this Warrant (with
the current  value being  based on the market  price of the Common  Stock on the
date the Warrant, accompanied by the shares of Common Stock delivered in respect
of such exercise,  is received by the Company or its transfer  agent),  equal to
the Exercise  Price.  If this Warrant should be exercised in part only,  whether
pursuant  to this  Paragraph  (a)(1) or  pursuant  to  Paragraph  (a)(2) of this
Warrant,  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 shares of Common Stock purchasable  hereunder.  Upon
receipt by the Company of this


                                      - 1 -
<PAGE>

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  shares  of  Common  Stock   issuable  upon  such  exercise,
notwithstanding  that the stock  transfer  books of the  Company  shall  then be
closed or that  certificates  representing such shares of Common Stock shall not
then be actually delivered to the Holder.

     (2) In lieu of  exercising  this Warrant by payment of the  Exercise  Price
pursuant to Paragraph (a)(1) of this warrant, the Holder shall have the right to
exchange this  Warrant,  in whole or in part to the extent that this Warrant has
not been exercised  pursuant to said Paragraph (a)(1),  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 on 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 on the date of exercise. The date
of exercise shall mean, for purposes of this Paragraph (a)(2), 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:

          (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

          (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  SHARES.  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 market value of such fractional  share,  determined in
the manner set forth in Paragraph (a)(2) of this Warrant,  except that the price
shall be based on 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 (k) 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


                                      - 2 -
<PAGE>

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.

     (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 in this Warrant.

     (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) In case the Company shall, subsequent to _________,  ____, (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 _________,  ____,  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 same shall equal the price  determined by  multiplying  the
Exercise  Price in effect  immediately  prior to the date of such  issuance by a
fraction,  of which the numerator  shall be the number of shares of Common Stock
outstanding  on the  record  date  mentioned  below  plus the  number  of shares
determined by multiplying the price or the conversion  price at which additional
shares of Common Stock are offered by the number of shares of Common Stock being
offered by the number of shares being issued, including shares being issued upon
conversion of any convertible securities, and dividing the result so obtained by
the current market price of the Common Stock, and of which the denominator 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.


                                      - 3 -
<PAGE>

          (3)  In  case  the  Company  shall,  subsequent  to  _________,  ____,
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.  The Company  agrees not to increase
the par value of the Common Stock other than in connection  with a reverse split
or  combination  or shares or other  recapitalization,  in which  event any such
increase  shall not be greater that which would result from the  application  of
the adjustments provided in Paragraph (f)(1) of this Warrant to the par value.

          (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 thirty (30)
consecutive  trading  days  commencing  forty five (45) 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 or on Nasdaq,  or if not listed or  admitted  to trading on
such  exchange  or such  market,  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 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.


                                      - 4 -
<PAGE>

          (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  engaged 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.

     (g) OFFICER'S CERTIFICATE. Whenever the Exercise Price shall be adjusted as
required by the  provisions of Paragraph (f) of this Warrant,  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 of Common Stock  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,
and the Company  shall,  forthwith  after each such  adjustment,  mail, by first
class mail, a copy of such certificate to the Holder at the 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 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  in which 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


                                      - 5 -
<PAGE>

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.

     (j) REGISTRATION UNDER THE SECURITIES ACT OF 1933.

     (1) (A) In the  event  that,  at any  time  during  the  five  year  period
commencing _________, ____, the Company registers its securities pursuant to the
Securities Act of 1933, as amended (the "Securities  Act"), in connection with a
public offering of its securities  (other than a registration  statement on Form
S-4 or S-8 or subsequent similar forms), the Company shall advise the registered
holders of the Series A Warrants or the Warrant  Shares  (each such person being
referred to herein as a "holder") by written  notice at least one (1) week prior
to the filing of any  registration  statement  under the Securities Act covering
securities  of the Company and will upon the request of any such holder  include
in any such registration statement such information as may be required to permit
a public offering of the Warrant  Shares;  provided,  however,  that the Company
shall not be required to include such Warrant Shares in a registration statement
relating  solely to an offering by the Company of securities for its own account
if the managing underwriter shall have advised the Company that the inclusion of
such Warrant Shares will have a material  adverse effect upon the ability of the
Company to sell  securities for its own account,  and provided  further that the
holders are not treated less favorably than others having piggyback registration
rights. The Company shall keep such registration  statement current for a period
of nine (9) months from the effective date of such registration statement or for
such  longer  period  as the  registration  statement  may be used  without  the
inclusion in such  registration  statement of  financial  statements  covering a
period subsequent to the financial statements initially included,  other than by
incorporation  by reference  from filings under the  Securities  Exchange Act of
1934, as amended (the "Exchange  Act"),  but in no event later than such date as
all of the registered  Warrant  Shares shall have been sold. In connection  with
such  registration,  if requested by the managing  underwriter as a condition to
the inclusion of the Warrant Shares in the registration  statement,  the holders
shall agree put to sell or otherwise  distribute the Warrant Shares  pursuant to
the  registration  statement  for such  period  (the  "lock-up  period")  as the
managing  underwriter  shall  request,  in which event the Company will keep the
registration statement effective for nine (9) months after the expiration of the
lock-up  period or such longer  period as is  hereinbefore  provided;  provided,
however,  that the holders are not treated  less  favorably  than others  having
piggyback registration rights.

     (B) If the Company  shall have  failed to include  the Warrant  Shares in a
registration statement by April 30, 1998, then, if, thereafter, but prior to May
1, 2002, the majority holder, as hereinafter  defined,  shall give notice to the
Company at any time when the Warrant  Shares are not  included  in an  effective
registration  statement, to the effect that such holder contemplates the sale of
the Warrant Shares under such circumstances that a public  distribution  (within
the meaning of the Securities Act) of the Warrant Shares will be involved,  then
the Company shall, subject to Paragraph (j)(1)(C) of this Warrant, within ninety
(90) days after receipt of such notice,  file a registration  statement pursuant
to the Act, to the end that the Warrant  Shares may be sold under the Securities
Act as promptly as  practicable  thereafter,  and the Company  will use its best
efforts to cause  such  registration  to become  effective;  provided  that such
holder shall furnish the Company with appropriate  information  (relating to the
intentions  of  such  holder)  in  connection  therewith  as the  Company  shall
reasonably  request  in  writing.  The  Company  shall  keep  such  registration
statement  current for such period as the  majority  holder may  request,  which
shall not  exceed  nine (9)  months or such  longer  period as the  registration
statement  may be used without the inclusion in such  registration  statement of
financial  statements  covering a period subsequent to the financial  statements
initially included,  other than by incorporation by reference from filings under
the Exchange Act, but in no event later than such date as all of the  registered
Warrant  Shares shall have been sold.  Upon receipt of notice the Company  shall
promptly  give notice to the holder  holders of Series A Warrants and shall,  at
the request of such holders,  include their Warrant Shares in the same manner as
if they had given the notice pursuant to this Paragraph (j)(1)(B). The holders


                                      - 6 -
<PAGE>

of the Series A Warrants  shall be entitled to only one (1) demand  registration
right pursuant to this Paragraph (j)(1)(B).

     (C)  Notwithstanding  the  provisions of Paragraph  (j)(1)(B),  the Company
shall be entitled  to defer the filing of the  registration  statement  demanded
pursuant to said Paragraph (j)(1)(B) under the following circumstances.

          (i) In the event that the  Company has  completed  an  acquisition  or
contemplates  an  acquisition  for which  financial  statements  of the acquired
company are required to be included in the registration  statement,  the Company
shall not be required to file the  registration  statement until forty-five (45)
days after the required financial  statements for the company which was or is to
be acquired have been received by the Company.

          (ii) In the event that,  at any time,  the Company shall be engaged in
confidential  negotiations  with respect to a business  transaction  or business
agreement  which would have to be disclosed  in a  registration  statement,  the
Company's  obligation to file the  registration  statement or any amendment to a
registration  statement  and the  Company's  obligation  to keep a  registration
statement  current shall be deferred until  forty-five (45) days after the first
to occur of (x) the date that such negotiations have been terminated, or (y) the
date  that  the  transaction  has  been  consummated,  or (z) the  date  that an
agreement  relating to the  transaction  has been  executed  and the Company has
publicly announced the transaction.

     (2) The following provision of this Paragraph (j) shall also be applicable:

          (A) The  Company  shall  bear  the  entire  cost  and  expense  of any
registration  of securities  initiated by it under  Paragraph  (j)(1)(A) of this
Warrant or filed  pursuant to Paragraph  (j)(1)(B) of this  Warrant.  Any holder
whose Warrant Shares are included in any such registration statement pursuant to
this  Paragraph  (j)  shall,  however,  bear  the  fees of his own  counsel  and
accountants  and any transfer  taxes or  underwriting  discounts or  commissions
applicable to the Warrant Shares sold by him pursuant thereto.

          (B) The Company shall indemnify and hold harmless each holder and each
underwriter,  within the meaning of the Securities Act, who may purchase from or
sell for any such holder any Warrant Shares from and against any and all losses,
claims,  damages and liabilities  (including fees and expenses of counsel, which
counsel  shall,  if, in the reasonable  opinion of counsel for the Company,  the
representation  by such counsel of both the Company and the indemnified  parties
constitutes  a  conflict  of  interest  under  applicable  Code of  Professional
Responsibility,  be separate  from counsel for the Company,  provided,  that the
Company shall not be required to pay the fees of more than one firm representing
all holders  and all other  parties who are  entitled  to  indemnification  as a
result of the same or similar  allegations,  which  counsel shall be selected by
the holders of a majority of the shares held by all of such indemnified parties)
caused by any untrue  statement or alleged  untrue  statement of a material fact
contained in the Registration Statement or any post-effective  amendment thereto
or any  registration  statement  under  the  Securities  Act  or any  prospectus
included  therein  required to be filed or furnished by reason of this Paragraph
(j) 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 such  holder or any such  underwriter  or any of them 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  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 any such holder or  underwriter  shall at the same time indemnify
the  Company,  its  directors,  each  officer  signing the related  registration
statement,  each person,  if any, who controls the Company within the meaning of
the  Securities  Act and each  other  holder,  in the  manner  set forth in this
Paragraph (j)(2)(B),  from and against any and all losses,  claims,  damages and
liabilities caused by any untrue


                                      - 7 -
<PAGE>

statement  of a material  fact  contained in any  registration  statement or any
prospectus  required to be filed or furnished by reason of this Paragraph (j) or
caused by any 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 omission based upon  information  furnished to the Company by any such holder
or underwriter expressly for use therein.

          (C)  Neither  the giving of any notice by any holder nor the making of
any  request  for  prospectuses  shall  impose any upon any holder  making  such
request any obligation to sell any Warrant Shares or exercise any Warrants.

          (D) In connection  with any  registration  statement filed pursuant to
this  Paragraph  (j),  the Company  shall  supply  prospectuses  and qualify the
Warrant  Shares for sale in such  states as the Warrant  holders may  reasonably
designates,  provided,  that the  Company  shall not be  required  to qualify or
register the Warrant  Shares in any  jurisdiction  where such  qualification  or
registration  would require the Company to submit  generally to the jurisdiction
of such state.

          (E) As a  condition  to the  inclusion  of the  Warrant  Shares of the
holder of this  Warrant,  such  holder  shall (i) furnish  the  information  and
indemnification  as set forth in  Paragraph  (j)(2)(B)  of this Warrant and (ii)
agree  not to sale or  otherwise  transfer  any  Warrant  Shares  pursuant  to a
registration  statement  upon  receipt  of  advice  from  the  Company  that the
registration statement is no longer current until the holder is advised that the
Warrant Shares may be sold pursuant to the registration statement.

          (F) The  registration  rights  contained in this Paragraph (j) as they
relate to this Warrant are personal to the Holder of this Warrant and may not be
assigned to any purchaser or other  transferee of Warrant  Shares other than the
estate, executors, administrators or legal representatives of the Holder of this
Warrant.

     (3) The  term  "majority  holder"  shall  mean  the  holders  of at least a
majority  of the  shares  of  Common  Stock  for  which  the  Series A  Warrants
(considered  in the aggregate)  are  exercisable  and shall include any owner or
combination of owners of such securities, which ownership shall be calculated by
determining  the  number of shares of Common  Stock held by such owner or owners
resulting  from the exercise of any Series A Warrant  after giving effect to any
stock dividend, split, reverse split or other recapitalization and the number of
shares of Common  Stock  issuable  upon  exercise  of any  unexercised  Series A
Warrants.

     (4) The  Company's  agreements  with respect to the Warrant  Shares in this
Paragraph  (j)  shall  continue  in effect  regardless  of the  exercise  of the
Warrants.

     (k) TRANSFER TO COMPLY WITH THE SECURITIES ACT OF 1933. 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 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 Act with
respect  thereto and then only against receipt of an agreement of such person to
comply with the  provisions of this  Paragraph (k) 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


                                      - 8 -
<PAGE>

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

Dated as of _________, ____

                                       PORTA SYSTEMS CORP.


                                       By: _________________________________
                                           William V. Carney
                                           Chairman of the Board and
                                           Chief Executive Officer


                                      - 9 -
<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
          delivery of shares of Common  Stock  pursuant to  Paragraph  (a)(1) of
          this Warrant.

_______   The undersigned  hereby irrevocably elects to exchange this Warrant to
          the extent of _______ shares of Common Stock pursuant to the provision
          of Paragraph (a)(2) of this Warrant.

                                   ----------

                     INSTRUCTIONS FOR REGISTRATION OF STOCK

Name  _____________________________________________
      (Please typewrite or print in block letters)

Signature  ________________________________________

Social Security or Employer Identification No. ____________________

                                 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 Common Stock  represented by this Warrant to the extent of
________  shares  as  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 -


                                                                     Exhibit 5.1

                                 March 26, 1998

                                                                       16450/019

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

                             Re: Porta Systems Corp.

Gentlemen:

     We  refer to the  registration  statement  on Form  S-3 (the  "Registration
Statement")  under the Securities Act of 1933, as amended (the "Act"),  filed by
Porta Systems Corp., a Delaware corporation (the "Company"), with the Securities
and Exchange  Commission.  Terms defined in the  Registration  Statement and not
otherwise  defined in this Opinion  shall have the same meanings in this Opinion
as in the Registration Statement.

     We have examined the originals or photocopies  or certified  copies of such
records of the  Company,  certificates  of  officers  of the  Company and public
officials,  and other  documents as we have deemed  relevant and  necessary as a
basis  for the  opinion  hereinafter  expressed.  In such  examination,  we have
assumed the  genuineness of all  signatures,  the  authenticity of all documents
submitted to us as certified  copies or photocopies and the  authenticity of the
originals of such latter documents.

     Based on our  examination  mentioned  above, we are of the opinion that the
outstanding  shares of Common Stock and the shares of Common Stock issuable upon
the exercise of the Warrants  ("Warrant  Shares") being registered to be sold by
the Selling  Stockholders  (i) in the case of the  outstanding  shares of Common
Stock, are duly authorized,  validly issued,  fully paid and  non-assessable and
(ii) in the case of the Warrant  Shares,  are duly  authorized  and, when issued
upon  exercise of the Warrants in  accordance  with the terms  thereof,  will be
validly issued, fully paid and non-assessable.

<PAGE>

Securities and Exchange Commission
March 26, 1998
Page 2


     We hereby  consent  to the filing of this  opinion  as  Exhibit  5.1 to the
Registration Statement and to the reference to our firm under "Legal Matters" in
the related Prospectus.  In giving the foregoing consent, we do not hereby admit
that we are in the category of persons whose consent is required under Section 7
of the  Act  or the  rules  and  regulations  of  the  Securities  and  Exchange
Commission.

                                     Very truly yours,

                                     s/Esanu Katsky Korins & Siger, LLP
                                     ESANU KATSKY KORINS & SIGER, LLP



                                                                    Exhibit 23.2

              Consent of Independent Certified Public Accountants

Porta Systems Corp.
Syosset, New York

      We hereby  consent to the  incorporation  by reference  in the  Prospectus
constituting a part of this Registration  Statement of our report dated March 9,
1998  relating to the financial  statements  of Porta  Systems  Corp.  ("Porta")
appearing  in the  Company's  Annual  Report  on Form  10-K for the  year  ended
December 31, 1997.

      We also consent to the reference to us under the caption  "Experts" in the
Prospectus.

                                          /s/ BDO Seidman, LLP
                                          --------------------------
                                              BDO SEIDMAN, LLP

Mitchel Field, New York
March 24, 1998



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