TII INDUSTRIES INC
S-3, 1999-11-03
SWITCHGEAR & SWITCHBOARD APPARATUS
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    As filed with the Securities and Exchange Commission on November 3, 1999

                                                      Registration No. 333-

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

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-3

                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                              TII INDUSTRIES, INC.
             (Exact name of registrant as specified in its charter)

          DELAWARE                                       66-0328885
(State or other jurisdiction of             (I.R.S. Employer Identification No.)
incorporation or organization)

                               1385 AKRON STREET,
                               COPIAGUE, NY 11726
                                 (516) 789-5000
               (Address, including zip code, and telephone number,
                 including area code, of registrant's principal
                               executive offices)
                           -------------------------

                           TIMOTHY J. ROACH, PRESIDENT
                              TII INDUSTRIES, INC.
                                1385 AKRON STREET
                               COPIAGUE, NY 11726
                                 (516) 789-5000
                (Name, address, including zip code, and telephone
               number, including area code, of agent for service)

                                    Copy to:
                             RICHARD A. RUBIN, ESQ.
                       PARKER CHAPIN FLATTAU & KLIMPL, LLP
                           1211 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10036
                                 (212) 704-6130


         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:  From time
to time 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  on  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
                                                          MAXIMUM            MAXIMUM             AMOUNT OF
        TITLE OF EACH CLASS            AMOUNT TO BE    OFFERING PRICE       AGGREGATE          REGISTRATION
  OF SECURITIES TO BE REGISTERED      REGISTERED (1)    PER SHARE (2)    OFFERING PRICE (2)         FEE
  ------------------------------      --------------   --------------    ------------------    ------------
<S>                                   <C>              <C>               <C>                   <C>
Common Stock, $.01 par value
per share (3)......................     2,500,000         $1.15625          $2,890,625.00         $803.60
- -------------------------------------------------------------------------------------------------------------
Total Registration Fee............................................................................$803.60
=============================================================================================================
</TABLE>

(1)  Pursuant  to Rule  416(b),  this  registration  statement  also  covers all
     additional  securities  resulting  from  anti-dilution  adjustments  to the
     registered  securities or registered securities issuable under the Series C
     Convertible Preferred Stock.

(2)  Estimated  solely  for the  purpose of  calculating  the  registration  fee
     pursuant to Rule 457(c) of the Securities Act of 1933, as amended, based on
     the average of the high and low sales prices on the Nasdaq  National Market
     on October 29, 1999.

(3)  There  are  also  being  carried  forward,   pursuant  to  Rule  429,  from
     Registration  Statement No.  333-47105,  1,359,582  unsold shares of common
     stock,  with respect to which a registration fee of $1,867.41 was paid. The
     shares  carried  forward  consist of (a)  1,159,582  shares of common stock
     underlying Series C Convertible Preferred Stock which may be converted into
     common stock and resold and (b) 200,000 shares of common stock which may be
     issued upon the  exercise  of warrants  held by the holders of the Series C
     Convertible  Preferred  Stock  and  resold.  The  shares  being  registered
     hereunder  cover the resale by the selling  stockholders  of the  presently
     estimated maximum additional shares of common stock that may be issued upon
     conversion of the Registrant's Series C Convertible Preferred Stock.

THE REGISTRANT HEREBY AMENDS THIS  REGISTRATION  STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE 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 COMMISSION,  ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

PURSUANT  TO RULE 429,  THE  PROSPECTUS  THAT FORMS A PART OF THIS  REGISTRATION
STATEMENT IS A COMBINED  PROSPECTUS  RELATING ALSO TO 1,359,582 SHARES OF COMMON
STOCK REGISTERED UNDER  REGISTRATION  STATEMENT NO. 333-47105 THAT HAVE NOT BEEN
SOLD. THIS REGISTRATION STATEMENT, ALSO CONSTITUTES POST-EFFECTIVE AMENDMENT NO.
1 TO REGISTRATION STATEMENT NO. 333-47105, AND SUCH POST-EFFECTIVE AMENDMENT NO.
1 SHALL HEREAFTER BECOME EFFECTIVE  CONCURRENTLY  WITH THE EFFECTIVENESS OF THIS
REGISTRATION  STATEMENT IN ACCORDANCE WITH SECTION 8(C) OF THE SECURITIES ACT OF
1933.
================================================================================


<PAGE>


The  information in this  prospectus is not complete and may be changed.  We may
not sell  these  securities  until the  registration  statement  filed  with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to sell nor is it seeking an offer to buy these  securities  in any state  where
the offer or sale is not permitted.

                  SUBJECT TO COMPLETION, DATED NOVEMBER 3, 1999


PROSPECTUS

                                2,520,331 SHARES

                              TII INDUSTRIES, INC.

                                  COMMON STOCK

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


         The  stockholders  of TII  Industries,  Inc.  listed on page 16 of this
prospectus may offer for sale up to 2,520,331  shares of our common stock.  This
prospectus  may  also be used by  those to whom  the  selling  stockholders  may
pledge, donate or transfer their shares and other non-sale transferees.

         The selling  stockholders  may offer  their  shares  through  public or
private transactions, on or off the Nasdaq National Market, at prevailing market
prices or at privately negotiated prices.

         Our common  stock is  currently  quoted on the Nasdaq  National  Market
under the symbol  "TIII." On November 2, 1999, the last reported sale price of a
share of our common stock on the Nasdaq National Market was $1-3/16.

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

         THIS  INVESTMENT  INVOLVES A HIGH DEGREE OF RISK. YOU SHOULD  CAREFULLY
         CONSIDER  THE  FACTORS  DESCRIBED  UNDER  THE  CAPTION  "RISK  FACTORS"
         BEGINNING ON PAGE 6 OF THIS PROSPECTUS.

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

         NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
         COMMISSION HAS APPROVED OR DISAPPROVED THESE SECURITIES,  OR DETERMINED
         IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE.  ANY  REPRESENTATION TO THE
         CONTRARY IS A CRIMINAL OFFENSE.

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

                   The date of this prospectus is ______, 1999


<PAGE>


                  WHERE YOU CAN FIND MORE INFORMATION ABOUT US


         We file annual,  quarterly and special  reports,  proxy  statements and
other information with the Securities and Exchange Commission.  You may read and
copy any document we file at the SEC's  public  reference  rooms in  Washington,
D.C.,  New  York,  New York and  Chicago,  Illinois.  Please  call the SEC at 1-
800-SEC-0330  for further  information on the public  reference  rooms.  Our SEC
filings are also  available to the public over the Internet at the SEC's Website
at "http://www.sec.gov."

         We have filed with the SEC two  registration  statements on Form S-3 to
register the shares of common stock being offered. This prospectus is a combined
prospectus under those registration statements. As permitted by the SEC's rules,
this  prospectus   does  not  contain  all  the  information   included  in  the
registration  statements.  For further  information  with  respect to us and our
common stock, you should refer to the registration  statements (SEC File numbers
333-47105  and  333-_____)  and to the exhibits and  schedules  filed as part of
those  registration  statements,  as well as the documents listed below. You can
review and copy the registration  statements,  their exhibits and schedules,  as
well  as  the  documents  listed  below,  at  the  public  reference  facilities
maintained by the SEC as described above. The registration statements, including
their exhibits and schedules, are also available on the SEC's Website.

         The SEC allows us to "incorporate by reference" the information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to those documents.  The information  incorporated by reference is
an important part of this  prospectus,  and information  that we file later with
the SEC will automatically update or supersede this information.  We incorporate
by reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a),  13(c), 14 or 15(d) of the Securities Exchange Act
of 1934 (File No.  1-8048) before our filing a  post-effective  amendment to the
registration  statements which indicates that all securities  offered under this
prospectus have been sold or which deregisters all securities remaining unsold:

     o    Annual Report on Form 10-K for the fiscal year ended June 25, 1999;

     o    Quarterly  Report on Form 10-Q for the fiscal quarter ended  September
          24, 1999; and

     o    The  description  of our common stock  contained  in the  Registration
          Statement  on Form 8-A  filed  on  November  3,  1980,  including  all
          amendments   or  reports  filed  for  the  purpose  of  updating  that
          description.

         This prospectus and the reports we incorporate by reference may contain
summaries of contracts or other documents. Because they are summaries, they will
not contain all of the  information  that may be  important to you. If you would
like complete  information  about a contract or other document,  you should read
the copy filed as an exhibit to the registration statements or to the reports we
incorporate by reference.

         You may  request a copy of these  filings,  at no cost,  by  writing or
telephoning us at the following address:

                         Mr. Paul G. Sebetic
                         Vice President - Finance
                         TII Industries, Inc.
                         1385 Akron Street
                         Copiague, New York 11726
                         (516) 789-5000


                                       -2-


<PAGE>


                               PROSPECTUS SUMMARY

         This summary  highlights some information from this prospectus.  It may
not contain all of the information important to you. To understand this offering
fully and get a better understanding of our business and operations,  you should
read  the  entire  prospectus   carefully,   including  the  documents  we  have
incorporated  by reference in the section  "Where You Can Find More  Information
About Us" on page 2.

         Please note that  references in this prospectus to "we," "our," "us" or
"TII" refer to TII  Industries,  Inc. and our  subsidiaries,  not to the selling
stockholders.

                                   THE COMPANY

         We are engaged in designing,  manufacturing and marketing lightning and
surge protection systems,  network interface devices and station electronics for
use in the communications  industry. We sell our products to telephone operating
companies,  including  to all four of the  Regional  Bell  Operating  Companies,
original  equipment  manufacturers,  cable television  providers and competitive
access providers of communications  services. We have been a leading supplier of
subscriber  station  overvoltage surge protectors to telephone  companies in the
United  States for over 25 years.  We believe that our  proprietary  overvoltage
surge protectors offer superior,  cost-effective performance features, including
high  reliability,  long life cycles and  advanced  protection  against  adverse
environmental conditions.

         Our products include:

          o    LIGHTNING  AND SURGE  PROTECTORS - Overvoltage  surge  protectors
               have been mandated in the United States by the National  Electric
               Code to be installed  on  subscriber  telephone  lines to prevent
               injury  to users  and  damage  to their  equipment  due to surges
               caused by lightning and other hazardous overvoltages. Overvoltage
               surge  protection is now also mandated under the recently amended
               National   Electric  Code  for  all  network  powered   broadband
               communications  conductors.  Surge  protectors:  (i)  protect the
               subscribers  and their  equipment;  (ii) reduce the  subscribers'
               loss of service; (iii) reduce the communications  provider's loss
               of  revenue  due to  subscriber  outages;  and  (iv)  reduce  the
               communications  provider's costs to replace or repair damaged its
               owned  equipment.  Our gas  tubes  provide  protection  when  the
               voltage on a  telephone  line rises to a level  preset in the gas
               tube.  If the voltage  reaches that level,  the gases in the tube
               instantly convert to molecules bearing an electronic charge. This
               momentarily  disconnects  the phone or other  equipment  from the
               circuit  while safely  conducting  the  hazardous  surge into the
               ground.  When the  voltage  on the  service  line drops to a safe
               level,  the  gases in the tube  return  to  their  normal  state,
               returning the phone and other connected equipment to service. Our
               gas tubes have been  designed to withstand  multiple  high energy
               overvoltage  surges  while  continuing  to  operate  over  a long
               service life with minimal failure rates. We also produce and sell
               a  patented  gas  tube  coaxial  cable  transmission  line  surge
               protector and solid state protectors,  as well as combining solid
               state protection with our gas tubes in hybrid  overvoltage  surge
               protectors.

          o    NETWORK  INTERFACE  DEVICES  -  Network  interface  devices  were
               developed to establish a separation  point  between the telephone
               companies'  property and  subscriber  property in response to the
               requirements  of the Federal  Communication  Commission and state
               public   service   commissions.   NIDs   typically  also  enclose
               overvoltage  surge  protectors  and  various  station  electronic
               products.  We  sometimes  refer to network  interface  devices as
               NIDs.  To  address  the demand  for  voice,  high-speed  data and
               interactive  video  services,   telephone   companies  and  other
               communications   providers  are  expanding  and  upgrading  their
               networks  to  accommodate  the  higher  bandwidth   necessary  to
               transmit these  services.  To meet our customers'  needs, we have
               introduced  a broadband  network  interface  device  product line
               specifically designed to house a


                                                        -3-


<PAGE>


              telephone  companies'  technology of choice,  whether  traditional
              twisted pair lines or high-bandwidth coaxial cable or fiber optic
              lines.

         o    STATION ELECTRONICs - Our station electronic products are designed
              to be installed with an  overvoltage  surge  protector,  typically
              within a NID. Our station electronics products include:

                  o   maintenance termination units designed to connect with the
                      telephone company's central office test equipment,  giving
                      the telephone  company  remote  testing  capabilities.  By
                      using the  remote  access  provided  by our  product,  the
                      telephone  company can determine the source of a defect or
                      fault before dispatching a maintenance vehicle.

                  o   plastic housings, wire terminals, enclosures, cabinets and
                      various   hardware   products,   principally  for  use  by
                      telephone operating companies.

         Our  principal  executive  office  is  located  at 1385  Akron  Street,
Copiague, New York 11726 and our telephone number is (516) 789-5000.

                                  THE OFFERING

Common stock offered  or that may be
offered by the selling stockholders.... 2,520,331  shares,  consisting of 67,241
                                        outstanding   shares,   200,000   shares
                                        issuable  upon the  exercise of warrants
                                        and  2,253,090   shares   issuable  upon
                                        conversion  of the  2,850  shares of our
                                        Series  C  Convertible  Preferred  Stock
                                        outstanding  at September 30, 1999 based
                                        on  an  average   conversion   price  of
                                        $1.2649 per share of common stock, which
                                        would have been applicable to our Series
                                        C Convertible  Preferred  Stock had they
                                        all been converted into our common stock
                                        on September  30, 1999.  We refer to our
                                        Series C Convertible  Preferred Stock as
                                        Series  C  preferred  stock.  Since  the
                                        actual  conversion price is likely to be
                                        95% of the  average of the  closing  bid
                                        prices of our  common  stock  during the
                                        ten consecutive trading days immediately
                                        preceding  the actual  conversion  date,
                                        the  actual  number  of  shares  of  our
                                        common  stock  that may be  issued  upon
                                        conversion  of the  Series  C  preferred
                                        stock will vary as the  market  price of
                                        our  common   stock   varies.   We  have
                                        therefore registered in the registration
                                        statements  of  which  this   prospectus
                                        forms a part  more  shares  in case  the
                                        actual  number of shares  issuable  upon
                                        conversion  of Series C preferred  stock
                                        increases.  Those additional  shares may
                                        only be sold by the selling stockholders
                                        after  we  reflect  the  change  in  the
                                        number of shares offered in a supplement
                                        to this prospectus.

Common stock outstanding on the date
of this prospectus....................  8,832,898 shares.

Common stock outstanding after the
offering..............................  11,353,229   shares,  assuming 2,253,090
                                        shares are issuedupon  conversion of the
                                        Series C preferred stock outstanding  on
                                        September 30, 1999.


                                       -4-


<PAGE>


Use of Proceeds.......................  The  selling  stockholders  will receive
                                        all of the proceeds from the sale of the
                                        shares. Accordingly, we will not receive
                                        any  proceeds  from  the  resale  of the
                                        shares.  We did  receive  $4,550,000  in
                                        proceeds from the issuance of the Series
                                        C preferred  stock and the warrants.  We
                                        will also receive the exercise  price of
                                        $7.03  per  share  to  the   extent  the
                                        selling  stockholders  elect to exercise
                                        the warrants. See "Use of Proceeds."

Risk Factors..........................  The    securities  offered  under   this
                                        prospectus  involve  a  high  degree  of
                                        risk. You should carefully  consider the
                                        factors beginning on the following page.


                                       -5-


<PAGE>


                           FORWARD-LOOKING STATEMENTS

         Some of the information in this prospectus and in the documents we have
incorporated  by  reference,  may  contain  forward-looking   statements.   Such
statements can be generally identified by the use of forward-looking  words like
as  "may,"  "should,"  "plan,"  "expect,"  "anticipate,"  "intend,"  "estimate,"
"potential,"  "believe" or other  similar words and the negative of those words.
These statements  discuss future  expectations or state other  "forward-looking"
information. When considering those statements, you should keep in mind the risk
factors and other cautionary  statements in this prospectus and in the documents
we have  incorporated by reference.  The risk factors  discussed below and other
factors noted in this prospectus and the documents which we have incorporated by
reference  could  cause our  actual  results  to differ  materially  from  those
contained in any forward-looking statements.

                                  RISK FACTORS

         BEFORE  YOU BUY SHARES OF OUR  COMMON  STOCK,  YOU SHOULD BE AWARE THAT
THERE ARE VARIOUS RISKS ASSOCIATED WITH THAT PURCHASE, INCLUDING THOSE DESCRIBED
BELOW.  YOU SHOULD CONSIDER  CAREFULLY THESE RISK FACTORS,  TOGETHER WITH ALL OF
THE OTHER  INFORMATION IN THIS PROSPECTUS AND THE DOCUMENTS WE HAVE INCORPORATED
BY  REFERENCE  IN THE  SECTION  "WHERE YOU CAN FIND MORE  INFORMATION  ABOUT US"
BEFORE YOU DECIDE TO PURCHASE  SHARES OF OUR COMMON  STOCK.  IF ANY OF THE RISKS
DISCUSSED  BELOW OR IN OUR OTHER SEC  FILINGS  OCCUR,  OR IF  UNFORESEEN  EVENTS
OCCUR,  OUR  BUSINESS,  FINANCIAL  CONDITION OR RESULTS OF  OPERATIONS  COULD BE
MATERIALLY AND ADVERSELY AFFECTED. IN THAT EVENT, THE MARKET PRICE OF OUR COMMON
STOCK COULD DECLINE,  IN WHICH CASE THE VALUE OF YOUR  INVESTMENT MAY DECLINE AS
WELL.

                                HISTORY OF LOSSES

         We have  reported  the  following  net losses for the last three fiscal
years:

Fiscal Year Ended:

         June 27, 1997              $  856,000
         June 26, 1998              $5,142,000
         June 25, 1999              $6,402,000

Quarter Ended:

         September 24, 1999         $  587,000


         Our results of operations were affected by several factors in our 1997,
1998 and 1999 fiscal years.

CERTAIN FACTORS AFFECTING FISCAL 1997 RESULTS

         During  fiscal  1997,  Access  Network  Technologies,  a joint  venture
between Lucent Technologies, Inc. and Raychem Corporation, was dissolved. We had
entered into a strategic  agreement with ANT in 1995 to develop and  manufacture
advanced  overvoltage surge  protectors.  While we and Raychem have continued to
manufacture and market the products  without the  participation  of Lucent,  the
dissolution  of ANT caused us to increase our allowance  for the inventory  that
was produced for ANT and to put into effect  certain  measures to reduce  costs.
The cost reduction  measures included a reduction of personnel,  the movement of
certain  production  processes to our facility in the  Dominican  Republic,  the
outsourcing of certain  manufacturing  steps,  the  realignment of our sales and
marketing force and the  discontinuance of certain lower margin products.  These
actions resulted in non-recurring charges of $3.0 million.


                                       -6-


<PAGE>


CERTAIN FACTORS AFFECTING FISCAL 1998 RESULTS

         To meet our  customers'  needs,  we introduced a line of broadband NIDs
with features and functionality that we believe were instrumental in our winning
major  contracts in July and  September of 1997 with a Regional  Bell  Operating
Company and an independent  telecommunications  company,  respectively,  each of
which was a  preexisting  unaffiliated  customer.  For  strategic  purposes,  we
accepted  orders under one of these  contracts that we believed we could fulfill
under  an  aggressive  delivery  time  schedule  that  mandated  us to  seek  to
accelerate production.

         Beginning in the fourth quarter of fiscal 1997 and  continuing  through
fiscal 1998, we incurred additional  manufacturing expenses in gearing up toward
the accelerated production of our new braodband NID product line, compounded, in
the second  quarter of fiscal 1998,  by production  disruptions  as we sought to
meet the customers' requested delivery schedules.  While we resolved most of the
production  disruption  issues toward the end of the second quarter,  during the
third and fourth  quarters of fiscal 1998,  we continued to  experience  certain
yield  losses,  costs  associated  with  outsourcing  the  production of certain
injection  molded parts and added costs to air freight products to meet customer
delivery requirements.

CERTAIN FACTORS AFFECTING FISCAL 1999 RESULTS

         During the fourth  quarter of fiscal  1999,  we  initiated  a strategic
operations  re-alignment  in an effort to  enhance  operating  efficiencies  and
reduce costs.  These results are expected to be achieved  through  outsourcing a
significant portion of our production,  closing our Dominican Republic facility,
workforce  reductions and other cost-saving  measures throughout TII. Under this
plan, we expect to reduce our workforce from approximately 1,165 employees as of
April 1999 to approximately 250 by the end of fiscal 2000,  including reductions
resulting from the completion of the sale of non-core  businesses.  As a result,
we recorded a charge to earnings of $6.0 million in fiscal 1999.

         This charge was partially offset by two non-recurring gains:

         o On September 21 and 22, 1998, our principal  operating  facilities in
Puerto Rico and the  Dominican  Republic,  respectively,  sustained  significant
inventory,  equipment and facility damages as a result of Hurricane Georges.  In
addition,  as a result of the storm, we experienced  production stoppages during
the beginning of the second quarter of fiscal 1999 and periods of less than full
production  continuing  into the fiscal 1999 third quarter.  Damaged  inventory,
business interruption losses, fees payable to our insurance advisors,  losses to
plant and equipment  and other  expenses  incurred  totaled  $17.9  million.  We
received  insurance  payments  of  $19.3  million  with  respect  to the  losses
sustained,  including  lost profits.  Accordingly,  insurance  proceeds,  net of
hurricane  losses and  expenses,  resulted  in a gain of $1.4  million in fiscal
1999.

         o In order to focus on our core business,  we sold substantially all of
the assets of our fiber optic  subsidiary,  TII-Ditel,  Inc.,  in March 1999 for
$5.3 million, resulting in a gain of $2.2 million.

  WE COULD LOSE OUR EXISTING CREDIT FACILITY IF OUR TANGIBLE NET WORTH DECLINES

         We  currently  have a credit  facility  in the amount of $7.7  million,
consisting  of a $1.7  million  term loan and a $6.0  million  revolving  credit
facility.  The revolving credit facility is limited by a borrowing base equal to
85% of eligible accounts  receivable and 50% of eligible  inventory,  subject to
reserves.   At  September  24,  1999,  only  the  $1.7  million  term  loan  was
outstanding.  The scheduled maturity date of the term loan is March 31, 2003 and
of any revolving credit loans will be April 30, 2003.

         The credit  facility  requires us to  maintain a tangible  net worth of
$21.0   million.   As  of  September  24,  1999,  our  tangible  net  worth  was
approximately  $26.3 million.  If operating losses continue or increase or if we
are required to redeem any  significant  amount of Series C preferred  stock, we
may cease to be in


                                      -7-


<PAGE>


compliance with the tangible net worth covenant. In that event, if we are unable
to  obtain a waiver or  amendment  of the  covenant,  we may be unable to borrow
under the  credit  facility  and may have to  immediately  repay all loans  then
outstanding under the facility.  If the credit facility is not available,  or if
the  amount we may  borrow  under it is not  sufficient  for our  needs,  we may
require  financing  from other  sources.  Our  inability to obtain the financing
could have a material adverse effect on our business,  results of operations and
financial condition.

                 RISKS ASSOCIATED WITH SERIES C PREFERRED STOCK

DILUTION

         To date,  we have issued a total of  1,187,659  shares of common  stock
with respect to the  conversion of 2,150 shares of Series C preferred  stock (at
an average conversion price of $1.81 per share). The Series C preferred stock is
convertible  at the  option of their  holders at the lower of $7.08 per share or
95% of the average of the closing bid prices of our common  stock during the ten
consecutive  trading days  immediately  preceding  the  conversion  date.  There
remains outstanding 2,850 shares of Series C preferred stock.

         Issuances of common stock upon  conversion of Series C preferred  stock
will reduce the voting  power and  interest  in our equity of other  outstanding
common stock,  the degree of which  dilution will depend on the number of shares
of common stock we are required to issue. Furthermore,  the conversion of Series
C preferred  stock at an average  conversion  price of less than $2.75 per share
(the book value of our common  stock as of  September  24, 1999) will reduce the
book value attributable to our other outstanding common stock.

POSSIBILITY OF REDEMPTION

         We have  registered a total of  3,859,582  shares of common stock under
the  Securities  Act of 1933 for resale upon  conversion of the 2,850  remaining
outstanding  shares of Series C  preferred  stock (this will cover all shares of
Series C preferred stock which were outstanding at September 30, 1999 as long as
their average conversion price is not less than $.79 per share).  However,  only
2,253,090  of  those  shares  can be sold  until  we file a  supplement  to this
prospectus to reflect the additional number of shares estimated to be sold.

         The  holders of Series C  preferred  stock may require us to redeem any
shares of Series C preferred  stock as to which we are unable to deliver  shares
of common stock  registered  for resale under the  Securities Act of 1933 at the
time the Series C preferred  stock holder  elects to convert  shares of Series C
preferred stock.

         The  redemption  price per share of Series C  preferred  stock  will be
equal to the  greater  of $1,150  per share of Series C  preferred  stock or the
closing bid price on the proposed  conversion  date of our common stock which we
would otherwise have issued.

         Redemptions of Series C preferred stock will result in a utilization of
our existing  cash since our  existing  bank credit  facility  prohibits us from
borrowing  for that purpose and will also reduce our net worth which could cause
us to lose our existing bank credit facility (see "-- We Could Lose Our Existing
Credit Facility if Our Tangible Net Worth Declines").

             RISKS ASSOCIATED WITH CUSTOMERS AND CUSTOMER AGREEMENTS

DEPENDENCE UPON KEY CUSTOMERS AND LACK OF LONG TERM COMMITMENTS

         The U.S.  telephone  industry  is  highly  consolidated,  with the four
Regional Bell Operating Companies and GTE Corporation  servicing over 85% of all
subscriber  lines.  Currently,  all four Regional Bell Operating  Companies have
designated one or more of our overvoltage surge protectors for use at certain of
their


                                       -8-


<PAGE>


subscriber  station  locations.  Direct  sales to the  Regional  Bell  Operating
Companies,   their  distributors  and  original  equipment   manufacturers  have
historically accounted for a substantial majority of our net sales.

         In most  instances,  our  sales are made  under  open  purchase  orders
received  from time to time from our  customers  under master  supply  contracts
which  cover one or more of our  products.  Some of those  contracts  permit the
customer to terminate the contract due to (i) the  availability of more advanced
technology   or  (ii)  our  inability  to  deliver  a  product  that  meets  the
specifications  on time.  Although most of our master supply  contracts  control
terms  such as the  purchase  price,  they  do not  establish  minimum  purchase
commitments.

         Certain  supply  contracts  provide that the customer may terminate the
contract at any time upon notice.

         The loss of one or more Regional Bell  Operating  Company as purchasers
of our  products,  or a substantial  decrease in the orders  received from those
purchasers,  could have a material  adverse  effect on our business,  results of
operations and financial condition.

CONTRACTUAL LIMITATIONS ON PRICE INCREASES AND PRICING PRESSURES

         Pricing pressures in the markets in which we operate are intense due in
part to the  consolidation  of various  telephone  companies and their resulting
purchasing power. Our master contracts generally prohibit us from increasing the
price of our products to be sold under the contract for stated  periods of time.
Accordingly, any significant increase in our costs during those periods, without
offsetting price increases,  could adversely effect our gross profit margins. In
addition,  some of our  contracts  with the Regional  Bell  Operating  Companies
contain  declining price  provisions which also could adversely affect our gross
margins if we cannot  achieve  corresponding  reductions  in unit  manufacturing
costs.

         RISKS ASSOCIATED WITH THE OVERVOLTAGE SURGE PROTECTORS INDUSTRY

TECHNOLOGICAL CHANGE AS IT PERTAINS TO OUR OVERVOLTAGE SURGE PROTECTORS

         Our  overvoltage  surge  protectors  are based  principally on gas tube
technology.  Solid state surge  protectors  have been  developed  for use in the
telecommunications  industry as a  competitive  technology  to gas tubes.  While
solid state overvoltage  surge protectors are faster at reacting to surges,  gas
tube overvoltage  surge protectors have generally  remained the surge protection
technology  of choice by most  telephone  companies  because  of the gas  tube's
ability to  withstand  significantly  higher  energy  surges  than  solid  state
overvoltage surge protectors.  However, as communications equipment becomes more
complex,  the speed of the  protector in reacting to a surge may be perceived to
be more  critical  than its energy  handling  capabilities.  Also,  solid  state
protectors  can be  combined  with gas  tubes  into a hybrid  overvoltage  surge
protector module. While hybrid surge protectors are generally more expensive and
complex than gas tube surge protectors, the hybrid unit can provide the speed of
a solid state unit with the energy handling capability of a gas tube unit.

         Although we have developed solid state and hybrid surge protectors, the
development by competitors of similar  products with increased  energy  handling
capabilities,  or the  development  of lower cost,  more  reliable  hybrid surge
protectors, could adversely effect our sales.

                              EFFECT OF COMPETITION

         We are subject to  significant  competition  with respect to all of our
products.   Specifically,   a  substantial  portion  of  our  overvoltage  surge
protectors are used in network  interface  devices which are manufactured by our
competitors.  Some of those competitors also market overvoltage surge protectors
and station electronics.


                                       -9-


<PAGE>


         The  Telecommunications Act of 1996 permits the Regional Bell Operating
Companies,  which  are  presently  the  principal  users  of  our  products,  to
manufacture  telecommunications  equipment.  Accordingly,  they could  decide to
manufacture and supply their own network  interface devices rather than purchase
them from outside suppliers. Most of our competitors and many of those who could
enter the  market in which we  operate  are  well-established  suppliers  to the
telephone companies.  In addition,  most are, or are part of, large corporations
which have substantially  greater assets,  financial  resources and larger sales
forces,  manufacturing  facilities and research and  development  staffs than we
have.  As a result,  the entry of any of those  companies  into the  overvoltage
surge protector market could reduce our sales.

NEW PRODUCT INTRODUCTION AND EVOLVING INDUSTRY STANDARDS

         We  continually  seek to improve our existing  products and develop new
products  and   enhancements  to  meet  the  needs  of  our  customers  and  the
marketplace.  However,  we  cannot  assure  you that we will be able to  respond
timely to changing  industry and customer needs.  The market for our products is
characterized by changing  technology,  evolving industry standards,  changes in
customer requirements, and product introductions and enhancements.

         Our success will depend, in large measure, upon our ability to timely:

               o    identify and develop new,  competitively  priced products to
                    keep  pace  with   changes  in   technology   and   customer
                    preferences,

               o    enhance our current product offerings, and

               o    develop new products that address our  customers'  needs for
                    additional functionality and new technologies.

         In addition,  product development cycles can be lengthy and are subject
to changing  requirements  and  unforeseen  factors  which can result in delays.
Also, new products or features may contain defects that,  despite  testing,  are
discovered  only after a product has been installed and used by customers.  Such
delays,  undetected  defects or product  recalls  could have a material  adverse
effect on our business, results of operations and financial condition.

     RISKS ASSOCIATED WITH OUR MANUFACTURING PROCESS AND INTERNAL OPERATIONS

POSSIBLE RISKS FROM OUR OFFSHORE MANUFACTURING

         Until  recently  we  had  been  producing  all  our  overvoltage  surge
protectors,  NIDs and station  electronics  at our facilities in Puerto Rico and
the Dominican  Republic.  As a result of a strategic  operations  review,  in an
effort to enhance  operating  efficiencies  and reduce  costs,  we determined to
outsource a significant portion of our production.  While we continue to produce
our gas tubes at our facility in Puerto Rico,  we have  retained a United States
company operating in China to be the principal  manufacturer of our products. As
the  outsourcing  of  production  increases in the future  under our  operations
re-alignment,  our dependency on our contract  manufacturer will increase.  As a
result,  we are subject to risks of doing  business  outside the United  States,
including  the  potential  delays and added  delivery  expenses in meeting rapid
delivery schedules of our customers.  In addition, the production of products in
China could subject us to risks arising from:

               o    potential  U.S.  government  sanctions,  like  embargos  and
                    restrictions on importation,
               o    potential currency fluctuations,
               o    potential labor unrest and political instability,
               o    potential restrictions on the transfer of funds,
               o    export duties and quotas, and
               o    U.S. customs and tariffs.

         Furthermore,  production  in Puerto Rico has in the past,  and could in
the future, be interrupted by the effects of hurricanes.


                                      -10-


<PAGE>


DEPENDENCE ON SUPPLIERS

         We  have  no  orders  with  suppliers  of  components  utilized  in the
manufacture of our products with delivery  scheduled later than a year from now.
Although we believe that substantially all raw materials we use will continue to
be available  to us in adequate  quantities  at  competitive  prices,  we cannot
assure  you that we will not  experience  delays in  delivery,  the  absence  of
components or supplies or increases in prices in the future.

                    RISKS ASSOCIATED WITH THE YEAR 2000 ISSUE

         We have been  implementing  a  program,  the  objective  of which is to
ensure  that the  Company  is not  adversely  affected  by "Date  Discontinuity"
problems in computers,  software and embedded  processors  during the transition
from 1999 to 2000 and as a result of 2000 being a leap year. Date  discontinuity
occurs when time as expressed by a system or its software  does not move forward
successfully  in line with true time. The most commonly known  manifestation  of
this occurs in systems that recognize  years as two digits and, when moving from
'99' to '00', recognize '00' as 1900 or fail altogether.

         Work was divided  into the  following  key  stages:  (1)  inventory  of
hardware,  software  and  embedded  systems,  (2)  analysis of  compliance,  (3)
defining and planning of solutions, (4) implementation and testing of solutions,
(5)  confirmation  of major  suppliers' and customers'  state of readiness,  (6)
contingency  planning.  Steps  1,  2,  3,  5  and  6  are  complete.  Step  4 is
substantially  complete,  with the Company's  enterprise wide  manufacturing and
accounting  system,  operating  systems,  servers  and the  majority of personal
computers  brought into Year 2000 compliance.  Some testing and additional minor
remediation programs are in progress and are expected to be completed by the end
of November  1999.  Further  testing will continue  throughout the remaining two
months  of  calendar  1999.  A  contingency  plan  has  been  developed  and  is
continually  reviewed to ensure all relevant issues are considered.  The Company
believes it is in full Year 2000 readiness for its critical systems, and that by
the end of  November  1999 it will be for  all its  systems.  The  Company  will
continue to monitor all areas through January 2000 and beyond.

         The  estimated   total  cost  of  achieving  Year  2000  compliance  is
approximately  $1,050,000 of which approximately $950,000 has been spent through
September 24, 1999.

         The  most  reasonably  likely  worst  case  scenario  of  a  Year  2000
compliance  failure by us or our  suppliers  is an event that would  disrupt our
procurement process and impact production and product delivery to customers.  We
plan to build up inventory  levels and have  requested  key  suppliers to do the
same. In addition, we are working with our suppliers to minimize the possibility
of such an event occurring and,  through our contingency  planning,  to mitigate
the consequences.  However, if we or our suppliers,  distributors or others with
whom we conduct  business are unable to identify  and address the system  issues
related  to the Year  2000 risk on a timely  basis,  there  could be a  material
adverse effect on our business, results of operations and financial condition.

             RISKS ASSOCIATED WITH THE OWNERSHIP OF OUR COMMON STOCK

WE DO NOT ANTICIPATE PAYING DIVIDENDS

         We intend to retain any future  earnings for use in our business.  As a
result,  we do not  anticipate  paying  any cash  dividends  in the  foreseeable
future. In addition,  our credit facility prohibits us from declaring and paying
any dividends.


                                      -11-


<PAGE>


POTENTIAL VOLATILITY OF STOCK PRICE

         The market price of our common stock has been at times,  and may in the
future be, subject to wide  fluctuations.  Factors that may adversely affect the
market price of our common stock include, among other things:

               o    quarter to quarter variations in operating results,
               o    the  occurrence  of events that  affect or could  affect our
                    operating results,
               o    changes in earnings estimates by analysts,
               o    announcements  regarding  technological  innovations  or new
                    products,
               o    announcements of gains or losses of significant customers or
                    contracts,
               o    prospects in the communications industry,
               o    changes in the regulatory environment,
               o    market conditions, and
               o    the sale or  attempted  sale of large  amounts of our common
                    stock into the public markets.

THE PRICE OF YOUR  STOCK MAY BE  AFFECTED  BY THE SALE OF  SHARES  ELIGIBLE  FOR
FUTURE SALE

         Sales of a  substantial  number of shares  of our  common  stock in the
public market could  adversely  affect the market price for our common stock. In
addition to the shares  covered by this  prospectus,  as of September  30, 1999,
there are 8,003,213  shares of our outstanding  common stock which may either be
sold without  restriction under the Securities Act or through the delivery of an
available prospectus.  Our remaining 829,685 outstanding shares at that date may
be sold subject to compliance with the volume and other  limitations of Rule 144
under  the  Securities  Act.  We have  also  registered  the  maximum  estimated
additional number of shares of our common stock that we presently believe we may
be  required to issue in the future  upon  conversion  of our Series C preferred
stock and all shares  issuable  upon  exercise of  outstanding  warrants we have
issued and issuable  upon  exercise of options we have  granted,  and may in the
future  grant,  under our stock option  plans.  See "Shares  Eligible for Future
Sale."

ANTI-TAKEOVER CONSIDERATIONS

         Our  certificate  of  incorporation  and the Delaware  Corporation  Law
contain  provisions  that,  while  intended to enable our Board of  Directors to
maximize  stockholder  value,  could  discourage  or  prevent  any  attempts  by
outsiders to obtain control of us through mergers, tender offers, proxy contests
and other means and could prevent or delay changes in our management. Generally,
attempts  to obtain  control of a company  results in  stockholders  obtaining a
premium above the market price of a company's  stock before the attempt is made.
These  provisions  include the following  which are described in greater  detail
under the caption "Description of Capital Stock":

               o    A Shareholder Rights Plan;
               o    The ability to issue preferred stock with terms fixed by our
                    Board of  Directors  at the time of their  issuance  without
                    further stockholder authorization;
               o    A supermajority vote to authorize certain transactions;
               o    A classified Board of Directors;
               o    A  requirement   that  directors  may  be  removed  only  by
                    stockholders for cause;
               o    The  benefits  of   Delaware's   "anti-takeover"   statutory
                    provisions.


                                      -12-


<PAGE>


                                 USE OF PROCEEDS

         The selling stockholders will receive all net proceeds from the sale of
the shares  offered by this  prospectus.  Accordingly,  we will not  receive any
proceeds from the resale of the shares.

         However,  we  received  net  proceeds  of  $4,550,000  from the private
placement  of our  Series C  preferred  stock  and the  warrants  issued  to the
purchasers  of our  Series  C  preferred  stock.  Of  those  proceeds,  we  used
approximately  $3,000,000 to purchase  equipment and leasehold  improvements  to
increase our manufacturing  capacity to support awarded  contracts.  We used the
balance of the net proceeds for working capital.

         We will also  receive the  exercise  price of $7.03 per share of common
stock issued to the extent the warrants  are  exercised.  We intend to use those
proceeds, if any, for working capital.

         We have agreed to bear the expenses incident to the registration of the
shares,  other than selling  discounts and commissions and the fees and expenses
of the selling stockholders' warrants in excess of $2,000.

                         SHARES ELIGIBLE FOR FUTURE SALE

         Of our 8,832,898 outstanding shares of common stock as of September 30,
1999,  7,435,972  shares were freely  tradeable  without  restriction  under the
Securities Act of 1933, 67,241 shares can be sold by delivering this prospectus,
and  500,000  shares  can be sold  by  delivering  a  prospectus  under  another
registration  statement.  The remaining 829,685 outstanding shares of our common
stock are owned by  persons  who may be  deemed to be our  "affiliates"  and are
presently  eligible  for sale under Rule 144,  subject to Rule 144's  volume and
other limitations.

         We have  also  registered,  for  possible  future  issuance  under  the
Securities Act:

          o    2,927,800  shares of common  stock  subject  to our stock  option
               plans (of which  2,505,501  shares  were  subject to  outstanding
               options as of September  30,  1999).  Any of those shares  issued
               upon  the  exercise  of  options  by  persons  who  are  not  our
               affiliates  will be freely  tradeable  upon  issuance  and any of
               those shares issued to our  affiliates  will be eligible for sale
               under Rule 144 without any further  holding period but subject to
               certain volume and other limitations.

         Furthermore, we have registered for potential resale:

         o    3,659,582  shares of our  common  stock  which may be issued  upon
              conversion of our 2,850  outstanding  shares of Series C preferred
              stock (see "Private Placement"),

         o    200,000  shares of our common  stock upon the exercise of warrants
              held by the holders of our Series C preferred  stock (see "Private
              Placement"), and

         o    10,000  shares of our common  stock  subject to issuance  upon the
              exercise of warrants  issued in July 1996 to purchase those shares
              until July 15, 2001 at an  exercise  price of $6.15 per share (all
              of those  warrants  were issued to a  broker-dealer  for financial
              advisory and consulting services and were transferred by that firm
              to various of its employees).

         In addition,  300,000  shares,  issuable upon conversion of convertible
indebtedness  issued in 1991 to an unaffiliated  third party,  will, if and when
converted,  be  eligible  for  immediate  sale under  paragraph  (k) of Rule 144
without any volume or other limitation.


                                      -13-


<PAGE>


                                PRIVATE PLACEMENT

         On January 26, 1998, we completed the private placement of 5,000 shares
of our  Series C  convertible  preferred  stock  and  warrants  to  purchase  an
aggregate of 200,000 shares of our common stock to the selling stockholders, two
of whom are  qualified  institutional  buyers  and the  other  three of whom are
accredited  investors,  for an aggregate purchase price of $5,000,000.  To date,
those investors have converted 2,150 shares of the Series C preferred stock into
1,187,659  shares of our common stock.  They advise us that, as of September 30,
1999, they have sold 1,120,418 of those shares of common stock. The exact number
of shares of our common stock they may acquire upon  conversion of the remaining
2,850 shares of Series C preferred  stock and sell depends upon the market price
of our common stock at the time they convert our Series C preferred stock.

         The following is a brief  description  of the Series C preferred  stock
and warrants and is qualified by reference to the Certificate of Designation for
the Series C preferred stock and the form of warrant for a complete  description
of  the  terms  of  those  securities.   Both  documents  are  exhibits  to  the
registration statements of which this prospectus forms a part.

         Dividends

         The Series C preferred stock bear no dividends.

         Liquidation

         The Series C preferred stock has a liquidation preference of $1,150 per
share.

         Voting

         The Series C preferred  stock has no voting rights,  except as required
by the Delaware General  Corporation Law and with respect to: (a) any changes to
the Certificate of Designation or our Certificate of  Incorporation  which would
amend, alter, change or repeal any of the powers, designations,  preferences and
rights of the Series C preferred  stock;  and (b) any issuance of any additional
Series C preferred stock.

         Conversion

         A holder may convert,  in any thirty-day period, up to one-third of the
aggregate number of Series C preferred shares purchased by the initial holder of
the shares being converted, subject to acceleration in certain instances.

         The Series C preferred  stock is currently  convertible at a conversion
price equal to the lower of:

         o     $7.08 per share, or

         o    95% of the average of the  closing bid prices of our common  stock
              during the ten consecutive trading days immediately  preceding the
              conversion date of the Series C preferred stock.

         The  conversion  prices are subject to reduction  based upon periods of
time that sales of shares of common  stock  underlying  the  Series C  preferred
stock cannot be made under a registration statement.


                                      -14-


<PAGE>


         The  fixed  conversion  price of $7.08  per  share is also  subject  to
anti-dilution adjustments with respect to:

         o    the issuances of common stock, or the issuance of securities which
              are exercisable into,  exchangeable for or convertible into common
              stock,  for a  consideration  (including  amounts  receivable upon
              exercise, exchange or conversion) below $7.08 per share (as it may
              be adjusted),

         o     subdivisions or combination of our common stock, and

         The variable  conversion  price is subject to reduction in the event of
our issuance of another variable price security.

         We are subject to  potential  penalties  in the event we fail to timely
permit conversion of Series C preferred shares.

         Compulsory Conversion

         Unless  converted  by the  holder  or  redeemed  by us,  the  Series  C
preferred stock will be automatically converted into common stock on January 26,
2003,  subject to possible delay in certain  circumstances.  We may also require
conversion of the Series C preferred  shares at any time on or after January 26,
2001.

REDEMPTION POSSIBILITY

         If we  cannot  issue  common  stock  for  any  reason,  or fail to have
sufficient  shares  issuable  upon  conversion  of our Series C preferred  stock
registered under the Securities Act of 1933 for resale,  we are to issue as many
shares  of  common  stock  as  we  are  able  to  issue  without  violating  any
restriction.  The holder of  unconverted  Series C preferred  shares may,  among
other things,  require us to redeem those Series C preferred  stock which we are
unable to convert at a redemption price equal to the greater of $1,150 per share
or the closing bid price on the  proposed  conversion  date of the common  stock
which would have otherwise been issued upon conversion of the Series C preferred
stock.

         The Series C preferred stock is also  redeemable,  at the option of the
holders,  at a price equal to the higher of $1,150 or the then closing bid price
of the underlying shares of our common stock in the event of:

          o    business combinations,

          o    the sale of substantially all of our assets,

          o    purchase,  tender  or  exchange  offer  for more  than 50% of our
               common stock,

          o    our failure to maintain  the  effectiveness  of the  registration
               statements for specified periods of time,

          o    our  failure to maintain  the listing of our common  stock on the
               Nasdaq  National  Market,  the American Stock Exchange or the New
               York Stock Exchange, or

          o    our  failure  to  effectuate  a required  conversion  of Series C
               preferred stock.

         Warrants

         The  warrants  are  exercisable  until  January 25, 2001 at an exercise
price equal to approximately $7.03 per share, subject to adjustment in the event
of stock splits, dividends, combinations,  reclassifications,  recapitalizations
or like capital adjustments.

         Registration of Underlying Shares

         We have filed two  registration  statements  covering the resale by the
selling  stockholders of 4,780,000 shares issuable upon conversion of the Series
C preferred  stock  (1,187,659 of which have been issued to, and 1,120,418  have
been sold by, the selling stockholders as of September 30, 1999) and 200,000


                                      -15-


<PAGE>


shares they may acquire upon the exercise of the warrants  should they choose to
do so. We agreed to maintain the  effectiveness of the  registration  statements
until  all  shares  of common  stock  issued  upon  conversion  of the  Series C
preferred  stock and exercise of the warrants are sold or until they may be sold
without  registration  under paragraph (k) of Rule 144 under the Securities Act.
We also agreed to permit,  with some exceptions,  the investors to join in other
registration  statements  we file in the  future.  We will bear all  expenses in
connection  with  any  registration,   other  than  underwriting  discounts  and
commissions,  fees and disbursements of investment bankers for the investors and
the fees and  expenses  of  counsel  to the  selling  stockholders  in excess of
$2,000.

                              SELLING STOCKHOLDERS

         The  following  table  contains   information   regarding  the  selling
stockholders'  ownership  of  shares of our  common  stock as of  September  30,
1999(based on the  assumption in footnote (1) of the table),  and as adjusted to
reflect the sale of the shares covered by this  prospectus.  This prospectus may
be used by the selling stockholders and those to whom they may pledge, donate or
transfer their shares and other non-sale transferees.


<TABLE>
<CAPTION>
                                                                                       Shares of Common
                                                                                         Stock Owned
                                                                                       after Offering
                                                                                     -------------------
                                                Shares of Common      Shares of       Shares of Common
                                               Stock Beneficially      Common         Stock to be Owned
                                                 Owned Prior to      Stock to be        after Offering
            Name                                   Offering (1)        Sold (1)       Number    Percent
- ---------------------------                    ------------------    -----------     -------    --------
<S>                                            <C>                   <C>             <C>        <C>
Leonardo, L.P.                                    2,168,487 (2)       2,168,487         0          --
GAM Arbitrage Investments, Inc.                      98,773 (3)          98,773         0          --
AG Super Fund International Partners, L.P.           91,224 (4)          91,224         0          --
Raphael, L.P.                                        98,319 (5)          98,319         0          --
Ramius Fund, Ltd.                                    63,528 (6)          63,528         0          --
                                                ---------------       ---------        ---       ------
         Total                                    2,520,331           2,520,331         0          --

</TABLE>
- -----------------

(1)  Based on the  assumption  that (a) all of the warrants held by each selling
     stockholder are exercised and (b) all Series C preferred stock  outstanding
     at September 30, 1999 held by each selling  stockholder  are converted into
     the estimated  number of shares  issuable  upon  conversion of the Series C
     preferred  stock on that date  (based  on an  average  conversion  price of
     $1.2649 per share of common stock,  which would have been applicable to our
     Series C preferred  Stock had they all been converted into our common stock
     on September 30, 1999).  Since the actual  conversion price is likely to be
     95% of the average of the closing bid prices of our common stock during the
     ten consecutive  trading days immediately  preceding the actual  conversion
     date,  the actual  number of shares of common stock that may be issued upon
     conversion of Series C preferred stock will vary as the market price of our
     common stock  varies.  We have  therefore  registered  in the  registration
     statements  of which this  prospectus  forms a part more shares in case the
     actual  number of shares  issuable  upon  conversion  of Series C preferred
     stock increases.  Those  additional  shares may only be sold by the selling
     stockholders after we reflect the change in the number of shares offered in
     a  supplement  to this  prospectus.  To the extent we would be obligated to
     issue more shares than are covered by the registration  statements,  we may
     be required to redeem the Series C preferred stock submitted for conversion
     unless  we  register  additional  shares of common  stock for  resale.  See
     "Private Placement."

(2)  Represents  (i) 52,093 shares owned as a result of the previous  conversion
     of Series C preferred stock, (ii) 1,976,394 shares issuable upon conversion
     of 2,500  shares of Series C  preferred  stock  and  (iii)  140,000  shares
     issuable upon the exercise of a warrant.


                                      -16-


<PAGE>


(3)  Represents (i) 7,717 shares owned as a result of the previous conversion of
     Series C preferred  stock,  (ii) 79,056 shares  issuable upon conversion of
     100 shares of Series C preferred  stock and (iii)  12,000  shares  issuable
     upon the exercise of a warrant.

(4)  Represents  (i) 168 shares owned as a result of the previous  conversion of
     Series C preferred  stock,  (ii) 79,056 shares  issuable upon conversion of
     100 shares of Series C preferred  stock and (iii)  12,000  shares  issuable
     upon the exercise of a warrant.

(5)  Represents (i) 7,263 shares owned as a result of the previous conversion of
     Series C preferred  stock,  (ii) 79,056 shares  issuable upon conversion of
     100 shares of Series C preferred  stock and (iii)  12,000  shares  issuable
     upon the exercise of a warrant.

(6)  Represents  (i) 39,528  shares  issuable  upon  conversion  of 50 shares of
     Series C preferred  stock and (ii) 24,000 shares issuable upon the exercise
     of a warrant.

         Other than being investors in our January 1998 private placement,  none
of the  selling  stockholders  have  been  affiliated  with us or  have  had any
material relationship with us during the past three years.

                              PLAN OF DISTRIBUTION

       The selling  stockholders  and their  pledgees,  donees,  transferees and
other  subsequent  holders of the shares  covered by this  prospectus  may offer
their shares at various times in or more of the following transactions:

          o    in or off the over-the-counter market; or

          o    in privately negotiated transactions

         The shares may be sold:

          o    at prevailing market prices at the time of sale;

          o    at prices related to those prevailing market prices;

          o    at negotiated prices; or

          o    at fixed prices.

         The  transactions  in the shares may be  effected by one or more of the
following methods:

          o    ordinary  brokerage  transactions  and  transactions in which the
               broker solicits purchasers;

          o    purchases by a broker or dealer as  principal,  and the resale by
               that broker or dealer for its account  under to this  prospectus,
               including resale to another broker or dealer;

          o    block  trades in which the broker or dealer will  attempt to sell
               the shares as agent but may  position and resell a portion of the
               block as principal to facilitate the transaction; or

          o    negotiated   transactions   between  selling   stockholders   and
               purchasers without a broker or dealer.


                                      -17-


<PAGE>


         The selling stockholders and any broker-dealers or other persons acting
on the behalf of parties that  participate in the distribution of the shares may
be deemed to be underwriters.  If so, any commissions or profits they receive on
the  resale  of the  shares  may be  deemed  to be  underwriting  discounts  and
commissions under the Securities Act.

         The  selling  stockholders  may also  sell the  shares  under  Rule 144
instead of under this prospectus, if Rule 144 is available for those sales.

         As of the date of this  prospectus,  we are not aware of any agreement,
arrangement or understanding between any broker or dealer and any of the selling
stockholders  with  respect  to the  offer or sale of the  shares  under to this
prospectus.

         We have advised the selling  stockholders  that during the time each is
engaged in distributing shares covered by this prospectus, each must comply with
the  requirements  of the Securities Act of 1933 and Rule 10b-5 and Regulation M
under the Securities  Exchange Act of 1934.  Under those rules and  regulations,
they:

          o    may not engage in any  stabilization  activity in connection with
               our securities;

          o    must furnish each broker  which  offers  common stock  covered by
               this  prospectus  with the  number of  copies of this  prospectus
               which are required by each broker; and

          o    may not bid for or purchase any of our  securities  or attempt to
               induce any person to purchase any of our securities other than as
               permitted under the Securities Exchange Act of 1934.

         While the selling  stockholders  are not  restricted in selling  shares
during  any  periods of time,  no selling  stockholder  may,  in any  thirty-day
period,  convert  more  than  one-third  of the  number  of  shares  of Series C
preferred stock purchased by it in the private placement.

         In the  registration  rights  agreements we executed in connection with
the private  placement we agreed to  indemnify  and hold  harmless  each selling
stockholder against liabilities,  including liabilities under the Securities Act
of 1933,  which may be based upon,  among other things,  any untrue statement or
alleged untrue  statement of a material fact or any omission or alleged omission
of a material fact, unless made or omitted in reliance upon written  information
provided to us by that selling stockholder.  We have agreed to bear the expenses
incident to the  registration  of the shares,  other than selling  discounts and
commissions,  fees and  disbursements  of  investment  bankers  and the fees and
expenses of counsel to the selling stockholders in excess of $2,000.


                                      -18-


<PAGE>


                          DESCRIPTION OF CAPITAL STOCK

GENERAL

         Our authorized  capital consists of 30,000,000  shares of common stock,
$.01 par value per share,  and 1,000,000  shares of preferred  stock,  $1.00 par
value per share.  As of September 30, 1999,  there were 8,832,898  shares of our
common  stock and 2,850  shares  of our  Series C  preferred  stock  issued  and
outstanding,  as  discussed  under  "Private  Placement,"  above.  We have  also
authorized a series of 30,000  shares of our  preferred  stock,  called Series D
junior  participating  preferred  stock,  which  may be issued  pursuant  to our
Shareholder Rights Plan discussed below.

COMMON STOCK

         Each  holder of common  stock is  entitled to one vote per share on all
matters submitted to a vote of stockholders. Subject to the rights of holders of
preferred stock,  the holders of common stock are entitled to receive  dividends
when,  as and if  declared  by our  Board  of  Directors.  In the  event  of the
liquidation,  dissolution or winding up of our operations, the holders of common
stock are entitled to share ratably in all assets remaining after the payment of
liabilities and any liquidation preference of our preferred stock. The shares of
common stock do not have any preemptive or other subscription rights, conversion
rights or  redemption  or sinking fund  provisions.  All of our shares of common
stock presently issued and outstanding are fully paid and non-assessable.

PREFERRED STOCK

         Our preferred stock is issuable in one or more series from time to time
at the  discretion  of the Board of  Directors.  The Board is  authorized,  with
respect to each series, to fix its designation,  powers,  preferences (including
with  respect  to  dividends  and on  liquidation),  rights  (including  voting,
dividend,  conversion,  sinking  fund and  redemption  rights) and  limitations.
Shares of preferred  stock  issued by action of the Board of Directors  could be
utilized as a method of making it more  difficult for a party to gain control of
us without the approval of our Board of Directors.

SHAREHOLDER RIGHTS PLAN

         On May 7, 1998,  our Board of Directors  adopted a  shareholder  rights
plan.  Under the rights plan, we distributed  one preferred stock purchase right
to each  holder of record of common  stock at the opening of business on May 21,
1998. Each right entitles  stockholders to buy one  one-thousandth of a share of
Series D junior participating preferred stock at a purchase price of $30 per one
one-thousandth of a share of Series D junior participating  preferred stock. The
rights do not become exercisable until a person or group acquires 20% or more of
our common  stock or  announces a tender offer which would result in that person
or group  owning 20% or more of our common  stock.  Each right will  entitle its
holder  (other than the  acquirer)  to purchase,  at a purchase  price of $30, a
number of shares of common  stock  having a market value of $60. The rights also
entitle holders to purchase shares of an acquirer's common stock. The rights may
be redeemed upon action by our Board of Directors or exchanged for shares of our
common  stock.  The  terms of the  rights  are set  forth in a Rights  Agreement
between us and Harris Trust Company of Chicago,  as Rights Agent, which has been
filed as an  exhibit to the  registration  statements  of which this  prospectus
forms a part. The rights expire on May 15, 2008 (unless extended).

CERTAIN PROVISIONS OF OUR CERTIFICATE OF INCORPORATION AND BY-LAWS

       Supermajority Vote for Certain Transactions

         Our Certificate of  Incorporation  requires the affirmative vote of the
holders of at least 75% of the outstanding  shares of our capital stock entitled
to vote thereon to authorize the following:


                                      -19-


<PAGE>


     (1)  any merger or consolidation  of us or any of our subsidiaries  with or
          into any other corporation;

     (2)  any sale, lease or exchange by us of all or  substantially  all of our
          assets and those of our subsidiaries taken as a whole; and

     (3)  our dissolution.

         The supermajority voting requirement applies in a transaction described
in (1) and (2) only if,  as of the  record  date  for  determining  stockholders
entitled to vote on the matter, the other party to the transaction  beneficially
owns  10% or more  of our  outstanding  capital  stock  entitled  to vote in the
election  of  directors  or who  beneficially  owned at least 10% of our  voting
capital stock at December 3, 1979. The supermajority voting requirement does not
apply to a transaction with a person or entity who became a 10% beneficial owner
after our Board of Directors  approved the  transaction  described in (1) or (2)
above or, as to our dissolution,  if the dissolution is substantially consistent
with the approved  transaction or with a person or entity who beneficially owned
at least 10% of our voting capital stock at December 3, 1979.

         Classification of Board of Directors and Removal of Directors

         Our  Certificate  of  Incorporation  and  By-laws  divide  the Board of
Directors into three classes,  designated  Class I, Class II and Class III. Each
class is to be as nearly equal in number as possible.  At each annual meeting of
stockholders,  directors  are elected to succeed  those in the class whose terms
then  expire.  Each  elected  director  serves for a term  expiring at the third
annual  meeting of  stockholders  after the director's  election,  and until the
director's  successor is elected and qualified.  As a result,  directors elected
stand for election only once in three years.  Our  Certificate of  Incorporation
and  By-laws  also  provide  that  directors  may be  removed  only for cause by
stockholders.

         Votes  Required  to Amend the  Provisions  on  Supermajority  Votes and
Removal of Directors.

         Our  Certificate  of   Incorporation   and  By-laws  provide  that  the
affirmative vote of the holders of at least 75% of our outstanding  voting stock
is required to make,  alter or repeal,  or to adopt any  provision  inconsistent
with, the supermajority  voting requirements for transactions and the provisions
for the classified board of directors and removal of directors.

DELAWARE BUSINESS COMBINATION PROVISIONS

         As a  Delaware  corporation,  we  are  subject  to  Section  203 of the
Delaware General  Corporation Law which regulates large accumulations of shares,
including  those  made by  tender  offers.  Section  203 may have the  effect of
significantly delaying a purchaser's ability to acquire our organization if that
acquisition  is not  approved  by our Board of  Directors  before the  purchaser
becomes an "Interested Stockholder."

         In general,  Section  203  prevents an  "Interested  Stockholder"  from
engaging in a "Business Combination" with a Delaware corporation for three years
following the date that person became an Interested Stockholder. For purposes of
Section 203, the term "Interested  Stockholder" is defined generally as a person
owning  15% or  more of a  corporation's  outstanding  voting  stock.  The  term
"Business Combination" is defined broadly to include:

          o    mergers and other  transactions  with or caused by the Interested
               Stockholder;

          o    sales or other dispositions to the Interested Stockholder (except
               proportionately  with the  corporation's  other  stockholders) of
               assets of the corporation or a subsidiary equal to 10% or more of
               the  aggregate  market  value of the  corporation's  consolidated
               assets or our outstanding stock;


                                      -20-


<PAGE>


          o    the issuance or transfer by the  corporation  or a subsidiary  of
               stock of the  corporation  or the  subsidiary  to the  Interested
               Stockholder  (except for transfers in a conversion or exchange or
               a pro-rata  distribution or certain other  transactions,  none of
               which   increase  the  Interested   Stockholder's   proportionate
               ownership  of any  class or series  of the  corporation's  or the
               subsidiary's stock); or

          o    receipt by the Interested Stockholder (except  proportionately as
               a stockholder),  directly or indirectly,  of any loans, advances,
               guarantees,  pledges or other financial  benefits  provided by or
               through the corporation or a subsidiary.

         The three-year  moratorium imposed on Business  Combinations by Section
203 does not apply if:

          (a)  before  the date on which a  stockholder  becomes  an  Interested
               Stockholder,  the target's board of directors approves either the
               Business  Combination  or the  transaction  that  resulted in the
               person becoming an Interested Stockholder,

          (b)  the Interested  Stockholder owns 85% of the corporation's  voting
               stock upon  consummation of the transaction  that made him or her
               an Interested  Stockholder  (excluding  from the 85%  calculation
               shares  owned  by  directors   who  are  also   officers  of  the
               corporation  and shares held by employee stock plans which do not
               permit  employees  to decide  confidentially  whether to accept a
               tender or exchange offer); or

          (c)  on or after the date a person becomes an Interested  Stockholder,
               the   target's   board  of   directors   approves   the  Business
               Combination,  and it is also approved at a stockholder meeting by
               two-thirds  of the  voting  stock  not  owned  by the  Interested
               Stockholder.

         The  restrictions  described  above  also  do  not  apply  to  Business
Combinations proposed by an Interested Stockholder following the announcement or
notification  of  extraordinary  transactions  involving the  corporation  and a
person who had not been an  Interested  Stockholder  during the  previous  three
years or who became an Interested Stockholder with the approval of a majority of
the corporation's directors.

         Anti-Takeover Effects

         The  provisions  of  our  Certificate  of  Incorporation   and  By-laws
described  above  and  the  effects  of  Section  203  of the  Delaware  General
Corporation Law could discourage potential acquisition proposals and could delay
or prevent a change in control of our company.  These provisions are intended to
enhance the  continuity and stability of our Board of Directors and the policies
formulated  by  the  Board  of  Directors  and  to  discourage   some  types  of
transactions  that may involve an actual or threatened  change in control of our
company.  These  provisions are also designed to reduce our  vulnerability to an
unsolicited  acquisition  proposal and to discourage tactics that may be used in
proxy fights.  However, those provisions may discourage or prevent third parties
from making offers for our shares.  As a result,  the market price of the common
stock may not benefit  from any premium  that might occur in  anticipation  of a
threatened or actual change in control. Such provisions also may have the effect
of preventing or delaying changes in our management.

INDEMNIFICATION

         We indemnify our officers and directors to the fullest extent permitted
under  Delaware law against all  liabilities  incurred in connection  with their
service to us.


                                      -21-


<PAGE>


TRANSFER AGENT AND REGISTRANT

         The transfer  agent and  registrar for our common stock is Harris Trust
Company of New York,  Wall Street  Plaza,  88 Pine  Street,  New York,  New York
10005.

                                  LEGAL MATTERS

         The validity of the shares of common stock being offered will be passed
upon for us by Parker Chapin Flattau & Klimpl, LLP.

                                     EXPERTS

         The audited consolidated  financial  statements,  including the related
notes thereto, incorporated by reference in this prospectus and elsewhere in the
registration  statement  have been audited by Arthur  Andersen LLP,  independent
public  accountants,  as indicated in their  report with respect  thereto.  Such
financial statements and report are incorporated by reference herein in reliance
upon the authority of said firm as experts in accounting  and auditing in giving
said reports.


                                      -22-


<PAGE>


<TABLE>
<CAPTION>

=======================================================      =======================================================
<S>                                                          <C>

         WE HAVE NOT AUTHORIZED ANYONE TO GIVE ANY                              2,520,331 Shares
INFORMATION OR TO REPRESENT ANYTHING NOT CONTAINED
IN THIS PROSPECTUS.  YOU MUST NOT RELY ON ANY
UNAUTHORIZED INFORMATION.  THIS PROSPECTUS DOES
NOT OFFER TO SELL OR BUY ANY SHARES IN ANY                                    TII INDUSTRIES, INC.
JURISDICTION WHERE IT IS UNLAWFUL.  THE INFORMATION
IN THIS PROSPECTUS IS CURRENT ONLY AS OF ITS DATE.
YOU SHOULD NOT ASSUME THAT THE INFORMATION
CONTAINED IN THIS PROSPECTUS  IS ACCURATE AS OF ANY                               Common Stock
OTHER DATE, AND NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER WILL
CREATE AN IMPLICATION TO THE CONTRARY.

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

                                                                                   PROSPECTUS

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

                   TABLE OF CONTENTS

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

                                                   Page

Where You Can Find More
     Information About Us.............................2
Prospectus Summary....................................3
Forward-Looking Statements............................6

Risk Factors..........................................6                         ________ __, 1999
Use of Proceeds......................................13
Shares Eligible for Future Sale......................13
Private Placement....................................14
Selling Stockholders ................................16
Plan of Distribution.................................17
Description of Capital Stock.........................19
Legal Matters........................................22
Experts .............................................22

=======================================================      =======================================================
</TABLE>

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

  It is estimated  that the  following  expenses  will be incurred in connection
with  the  proposed  offering  hereunder.  We  will  bear  all of the  following
expenses:

Registration fee - Securities and Exchange Commission..........     $   803.60
Nasdaq Listing Fees............................................      17,500.00
Legal fees and expenses........................................       7,500.00
Accounting fees and expenses...................................       2,500.00
Printing and engraving expenses................................       1,000.00
Miscellaneous..................................................         696.40
                                                                     ---------
                                                Total..........     $30,000.00
- ---------------------

(1)  All  expenses  relate  solely  to this  registration  statement  and are in
     addition to expenses for the private  placement and Registration  Statement
     No. 333-47105.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section  145 of the  General  Corporation  Law of the State of Delaware
provides,  in general,  that a  corporation  incorporated  under the laws of the
State of Delaware, like the registrant, may indemnify any person who was or is 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 a  derivative  action  by or in the right of the
corporation)  by  reason  of the fact  that  the  person  is or was a  director,
officer,  employee  or agent of the  corporation,  or is or was  serving  at the
request of the corporation as a director,  officer, employee or agent of another
enterprise,  against expenses (including attorneys' fees), judgments,  fines and
amounts paid in settlement  actually and  reasonably  incurred by that person in
connection  with such action,  suit or  proceeding  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 action
or  proceeding,  had no reasonable  cause to believe such  person's  conduct was
unlawful.  In the  case of a  derivative  action,  a  Delaware  corporation  may
indemnify any such person against expenses (including  attorneys' fees) actually
and  reasonably  incurred  by such  person in  connection  with the  defense  or
settlement  of such action or suit 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,  except that no  indemnification  shall be made in
respect of any claim,  issue or matter as to which such  person  shall have been
adjudged to be liable to the corporation  unless and only to the extent that the
court determines such person is fairly and reasonably  entitled to indemnity for
such  expenses.  Article  XII of the  registrant's  By-laws  provides  that  the
registrant  shall so indemnify  such  persons.  In  addition,  Article 12 of the
registrant's  Restated Certificate of Incorporation,  as amended,  provides,  in
general,  that no director of the registrant  shall be personally  liable to the
registrant  or any of its  stockholders  for  monetary  damages  for  breach  of
fiduciary  duty as a director,  except for  liability  (i) for any breach of the
director's duty of loyalty to the corporation or its stockholders; (ii) for acts
or omissions  not in good faith or which  involve  intentional  misconduct  or a
knowing  violation of law;  (iii) under Section 174 of the DGCL (which  provides
that, under certain circumstances, directors may be jointly and severally liable
for willful or negligent violations of the DGCL provisions regarding the payment
of  dividends  or stock  repurchases  or  redemptions),  as the same  exists  or
hereafter may be amended;  or (iv) for any  transaction  from which the director
derived an improper personal benefit.


                                      II-1


<PAGE>


ITEM 16.          EXHIBITS:

Exhibit Number         Description
- --------------         -----------

4.1(a)         Restated  Certificate of  Incorporation of TII, as filed with the
               Secretary of State of the State of Delaware on December 10, 1996.
               Incorporated by reference to Exhibit 3 to the Company's Quarterly
               Report on Form 10-Q for the fiscal  quarter  ended  December  27,
               1996 (File No. 1-8048).

4.1(b)         Certificate of Designation,  as filed with the Secretary of State
               of the State of  Delaware on January 26,  1998.  Incorporated  by
               reference  to  Exhibit  4.1 to the  Company's  Report on Form 8-K
               dated (date of earliest event reported)  January 26, 1998.  (File
               No. 1-8048).

4.1(c)         Certificate of Designation,  as filed with the Secretary of State
               of the  State  of  Delaware  on May  15,  1998.  Incorporated  by
               reference  to  Exhibit  4.1 to the  Company's  Report on Form 8-K
               dated (date of  earliest  event  reported)  May 7, 1998 (File No.
               1-8048).

4.2            By-laws  of TII, as amended. Incorporated by reference to Exhibit
               4.02 to Amendment No. 1 to the Company's  Registration  Statement
               on Form S-3 (File No. 33-64980).

4.3            Rights  Agreement,  dated  as of May 15,  1998,  between  TII and
               Harris Trust of Chicago. Incorporated by reference to Exhibit 4.1
               to the  company's  Current  Report  on Form  8-K  dated  (date of
               earliest event reported) May 7, 1998 (File No. 1-8048).

*5             Opinion of Parker Chapin Flattau & Klimpl, LLP as to the legality
               of the common stock being offered and consent.

*23.1          Consent of Arthur Andersen LLP.

*23.2          Consent of  Parker   Chapin  Flattau  &  Klimpl, LLP (included in
               Exhibit  5).  *24 Powers of  Attorney  of  certain  officers  and
               directors of TII (included in the signature page, page II-4).

99.1           Form of warrant issued to the investors in TII's January 26, 1998
               private  placement.  Incorporated by reference to Exhibit 99.1 to
               TII's  Current  Report  on  Form  8-K  (date  of  earliest  event
               reported) January 26, 1998 (File No. 1-8048).

99.2           Securities  Purchase  Agreement  dated as of January  26, 1998 by
               and among TII and the investors in TII's January 26, 1998 private
               placement.  Incorporated  by  reference  to Exhibit 99.2 to TII's
               Current  Report on Form 8-K  (date of  earliest  event  reported)
               January 26, 1998 (File No. 1-8048).

99.3           Registration  Rights  Agreement  dated as of January  26, 1998 by
               and among the company and the investors in TII's January 26, 1998
               private  placement.  Incorporated by reference to Exhibit 99.3 to
               TII's  Current  Report  on  Form  8-K  (date  of  earliest  event
               reported) January 26, 1998 (File No. 1-8048).

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

*    Filed  herewith.  All other exhibits are  incorporated  by reference to the
     indicated exhibit in the indicated filing.


                                      II-2


<PAGE>


ITEM 17.  UNDERTAKINGS

        (a)     The undersigned Registrant undertakes:

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

               (i)  To include any  prospectus  required by Section  10(a)(3) of
                    the Securities Act of 1933;

              (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;

             (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  the
                    information in this Registration Statement;

provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs  is  contained  in periodic  reports  filed by the  Registrant  under
Section  13 or Section  15(d) of the  Securities  Exchange  Act of 1934 that are
incorporated by reference in this Registration Statement.

              (2) That, for the  purpose  of  determining  any  liability  under
the Securities Act of 1933, each post-effective  amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of those  securities at the 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  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual  report  under  Section  13(a)  or  Section  15(d)  of  the
Securities  Exchange  Act of  1934  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 those securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (c)  Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the Registrant  under the  Registrant's  By-Laws,  or otherwise,  the
Registrant  has been advised that in the opinion of the  Securities and Exchange
Commission  indemnification  is  against  public  policy  as  expressed  in  the
Securities  Act of 1933 and is,  therefore,  unenforceable.  In the event that a
claim for  indemnification  against those 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 the 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
that  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities  Act of 1933 and will be governed by the final  adjudication  of that
issue.


                                      II-3


<PAGE>


                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  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 the  Town of  Copiague,  State  of New  York,  on the 2nd day of
November, 1999.

                                       TII INDUSTRIES, INC.

                                       By:  /s/ Timothy J. Roach
                                           -------------------------------------
                                                Timothy J. Roach, President


         KNOW ALL PERSONS BY THESE  PRESENTS,  that each person whose  signature
appears below  constitutes and appoints each of Alfred J. Roach, Paul G. Sebetic
and  Timothy  J.  Roach  and each of them  with  power of  substitution,  as his
attorney-in-fact, in all capacities, to sign any amendments to this registration
statement  (including  post-effective  amendments)  and to file the  same,  with
exhibits  thereto  and  other  documents  in  connection  therewith,   with  the
Securities  and Exchange  Commission,  ratifying  and  confirming  all that said
attorney-in-facts  or their  substitutes  may do or  cause to be done by  virtue
hereof.

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has been signed below by the  following  persons in the
capacities indicated on the 2nd day of November, 1999.

          Signature                          Title
          ---------                          -----

 /s/ Alfred J. Roach
- ------------------------------------------   Chairman of the Board
     Alfred J. Roach

 /s/ Timothy J. Roach
- ------------------------------------------   President (Chief Executive Officer)
     Timothy J. Roach                        and Director

 /s/ Paul G. Sebetic
- ------------------------------------------   Vice President - Finance (Chief
     Paul G. Sebetic                         Financial and Accounting Officer)

 /s/ C. Bruce Barksdale
- ------------------------------------------   Director
     C. Bruce Barksdale

 /s/ George S. Katsarakes
- ------------------------------------------   Director
     George S. Katsarakes

 /s/ James R. Grover, Jr.
- ------------------------------------------   Director
     James R. Grover, Jr.

 /s/ Joseph C. Hogan
- ------------------------------------------   Director
     Joseph C. Hogan

- ------------------------------------------   Director
                Dorothy Roach

 /s/ William G. Sharwell
- ------------------------------------------   Director
     William G. Sharwell


                                      II-4


<PAGE>


                       EXHIBIT INDEX

4.1(a)         Restated  Certificate of  Incorporation of TII, as filed with the
               Secretary of State of the State of Delaware on December 10, 1996.
               Incorporated by reference to Exhibit 3 to the Company's Quarterly
               Report on Form 10-Q for the fiscal  quarter  ended  December  27,
               1996 (File No. 1-8048).

4.1(b)         Certificate of Designation,  as filed with the Secretary of State
               of the State of  Delaware on January 26,  1998.  Incorporated  by
               reference  to  Exhibit  4.1 to the  Company's  Report on Form 8-K
               dated (date of earliest event reported)  January 26, 1998.  (File
               No. 1-8048).

4.1(c)         Certificate of Designation,  as filed with the Secretary of State
               of the  State  of  Delaware  on May  15,  1998.  Incorporated  by
               reference  to  Exhibit  4.1 to the  Company's  Report on Form 8-K
               dated (date of  earliest  event  reported)  May 7, 1998 (File No.
               1-8048).

4.2            By-laws  of TII, as amended. Incorporated by reference to Exhibit
               4.02 to Amendment No. 1 to the Company's  Registration  Statement
               on Form S-3 (File No. 33-64980).

4.3            Rights  Agreement,  dated  as of May 15,  1998,  between  TII and
               Harris Trust of Chicago. Incorporated by reference to Exhibit 4.1
               to the  company's  Current  Report  on Form  8-K  dated  (date of
               earliest event reported) May 7, 1998 (File No. 1-8048).

*5             Opinion of Parker Chapin Flattau & Klimpl, LLP as to the legality
               of the common stock being offered and consent.

*23.1          Consent of Arthur Andersen LLP.

*23.2          Consent of  Parker   Chapin  Flattau  &  Klimpl, LLP (included in
               Exhibit  5).  *24 Powers of  Attorney  of  certain  officers  and
               directors of TII (included in the signature page, page II-4).

99.1           Form of warrant issued to the investors in TII's January 26, 1998
               private  placement.  Incorporated by reference to Exhibit 99.1 to
               TII's  Current  Report  on  Form  8-K  (date  of  earliest  event
               reported) January 26, 1998 (File No. 1-8048).

99.2           Securities  Purchase  Agreement  dated as of January  26, 1998 by
               and among TII and the investors in TII's January 26, 1998 private
               placement.  Incorporated  by  reference  to Exhibit 99.2 to TII's
               Current  Report on Form 8-K  (date of  earliest  event  reported)
               January 26, 1998 (File No. 1-8048).

99.3           Registration  Rights  Agreement  dated as of January  26, 1998 by
               and among the company and the investors in TII's January 26, 1998
               private  placement.  Incorporated by reference to Exhibit 99.3 to
               TII's  Current  Report  on  Form  8-K  (date  of  earliest  event
               reported) January 26, 1998 (File No. 1-8048).


                                      II-5


<PAGE>


                                                                      Exhibit 5


                                November 1, 1999



TII Industries, Inc.
1385 Akron Street
Copiague, New York  11726

Gentlemen:

         We have acted as counsel to TII Industries, Inc, a Delaware corporation
(the  "Company"),  in connection with a Registration  Statement on Form S-3 (the
"Registration   Statement")   being  filed  with  the  Securities  and  Exchange
Commission  under the  Securities  Act of 1933, as amended,  covering  2,500,000
shares of the Company's Common Stock,  $.01 par value (the "Shares"),  which may
be issued,  together  with  1,159,582 of the shares  previously  registered  for
resale under  Registration  Statement No.  333-47105,  upon  conversion of 2,850
shares of the Company's  Series C Convertible  Preferred  Stock (the  "Preferred
Stock").

         In connection with the foregoing, we have examined originals or copies,
satisfactory  to us, of all such corporate  records and of all such  agreements,
certificates  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 originals and the conformity  with the original  documents of
all documents submitted to us as copies or facsimiles.  As to any facts material
to  such  opinion,  we  have,  to  the  extent  that  relevant  facts  were  not
independently  established by us, relied on certificates of public officials and
certificates of officers or other representatives of the Company.

         Based upon and subject to the foregoing, we are of the opinion that the
Shares,  when issued upon  conversion of the Preferred  Stock in accordance with
the terms and  provisions  of the  Certificate  of  Designation  under which the
Preferred  Stock  were  issued,   will  be  validly   issued,   fully  paid  and
non-assessable.

         We  hereby  consent  to the use of our name  under the  caption  "Legal
Matters" in the Prospectus constituting a part of the Registration Statement and
to the filing of this opinion as an exhibit to the Registration Statement.

                                   Very truly yours,

                                   /s/ PARKER CHAPIN FLATTAU & KLIMPL, LLP



                                      II-6


<PAGE>


                                                                    Exhibit 23.1


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration statement of our report dated September 15, 1999,
included in TII  Industries,  Inc.'s Form 10-K for the year ended June 25, 1999,
and to all references to our firm included in this registration statement.

/s/ ARTHUR ANDERSEN LLP

San Juan, Puerto Rico,
October 29, 1999


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