EXHIBIT 4.2


                           CERTIFICATE OF DESIGNATIONS


               SERIES G 6% CUMULATIVE CONVERTIBLE PREFERRED STOCK

                        SERIES H SPECIAL PREFERRED STOCK

               SERIES I 6% CUMULATIVE CONVERTIBLE PREFERRED STOCK

                        SERIES J SPECIAL PREFERRED STOCK

                                       OF

                            SHARED TECHNOLOGIES INC.


         SHARED  TECHNOLOGIES  INC.,  a  Delaware  corporation,  certifies  that
pursuant to the authority expressly granted to the Board of Directors in Article
FOURTH of the Corporation's Restated Certificate of Incorporation,  the Board of
Directors of the Corporation duly adopted the following resolution creating four
series of  Preferred  Stock  designated  as Series G 6%  Cumulative  Convertible
Preferred  Stock,  Series H  Special  Preferred  Stock,  Series I 6%  Cumulative
Convertible Preferred Stock and Series J Special Preferred Stock:

         RESOLVED:         That this  Corporation  create and authorize  250,000
                           shares   of  Series  G  6%   Cumulative   Convertible
                           Preferred  Stock  and  200,000  shares  of  Series  H
                           Special Preferred Stock, each with the terms,  rights
                           and  preferences  as set forth in the  Designation of
                           Rights and Preferences,  attached hereto as Exhibit A
                           and Exhibit B, respectively, and made a part of these
                           resolutions,  and to be issued in accordance with the
                           provisions of the Merger Agreement;

         RESOLVED:         That this  Corporation  create  and  authorize  up to
                           250,000 shares of Series I 6% Cumulative  Convertible
                           Preferred  Stock  and  200,000  shares  of  Series  J
                           Special Preferred Stock, each with the terms,  rights
                           and  preferences  as set forth in the  Designation of
                           Rights and Preferences,  attached hereto as Exhibit C
                           and Exhibit D, respectively, and made a part of these
                           resolutions,  and to be issued in accordance with the
                           provisions of the Exchange Agreement;

         RESOLVED:         That in connection  with the  foregoing  resolutions,
                           each of the Chief  Executive  Officer and  President,
                           the  Chief  Financial  Officer,  Treasurer,  any Vice
                           President and Secretary of this  Corporation  be, and
                           each hereby is,  authorized and directed,  for and on
                           behalf of this  Corporation,  to file such documents,
                           including,  but not  limited to, the  Designation  of
                           Rights and Preferences  annexed hereto as 




                           Exhibits A, B, C  and  D as are  necessary  with  the
                           Secretary  of State of Delaware.

         IN WITNESS  WHEREOF,  said  SHARED  TECHNOLOGIES  INC.  has caused this
Certificate of Designations of its Series G 6% Cumulative  Convertible Preferred
Stock,  Series H Special  Preferred  Stock,  Series I 6% Cumulative  Convertible
Preferred Stock and Series J Special  Preferred Stock to be duly executed by its
Senior  Vice  President  and  attested  to by its  Secretary  and has caused its
corporation seal to be affixed hereto as of the 8th day of March, 1996.


                                                     SHARED TECHNOLOGIES INC.


                                                     By:/s/ Vincent DiVincenzo
                                                        Vincent DiVincenzo,
                                                        Senior Vice President

(Corporation Seal)

ATTEST:


/s/ Kenneth M. Dorros
Kenneth M. Dorros, Secretary

                                       2


                 Designation of Series H Special Preferred Stock


                  1. Designation; Rank. The series of Preferred Stock designated
and known as "Series H Special Preferred Stock" shall consist of 200,000 shares,
par value $.01 per share.  Shares of the Special  Preferred  Stock  shall,  with
respect to rights on liquidation, winding up and dissolution, rank senior to all
classes of common stock of the Corporation (including,  without limitation,  the
Common Stock,  par value $.004 per share (the "Common  Stock")),  and each other
class of capital stock or series of preferred stock hereafter created which does
not expressly provide that it ranks on a parity with the Special Preferred Stock
as to rights on liquidation,  winding up and dissolution  ("Junior Stock"), on a
parity with the Series D Preferred Stock, Cumulative Convertible Preferred Stock
and each other class of capital  stock or series of  preferred  stock  hereafter
created  which  expressly  provides  that it ranks on a parity  with the Special
Preferred Stock as to rights on liquidation, winding up and dissolution ("Parity
Stock"),  and,  junior to the Series C  Preferred  Stock and each other class of
capital  stock or series of preferred  stock  hereafter  created  which has been
approved  by the  holders of the  Special  Preferred  Stock in  accordance  with
Section 4 and  which  expressly  provides  that it ranks  senior to the  Special
Preferred Stock as to rights on liquidation, winding up and dissolution ("Senior
Stock").

                  2.       Dividends.

                  (a)      The holders  of the Special Preferred Stock shall not
be entitled to receive any dividends.

                  3.       Liquidation, Dissolution or Winding Up.

                  (a) In the event of any voluntary or involuntary  liquidation,
dissolution or winding up of the  Corporation,  the holders of shares of Special
Preferred Stock then outstanding  shall be entitled to be paid out of the assets
of the Corporation  available for  distribution to its  stockholders,  after and
subject to the payment in full of all amounts  required to be distributed to the
holders of any Senior Stock but before any payment  shall be made to the holders
of any Junior  Stock,  and on a parity with any payment to the holders of Parity
Stock,  an amount equal to $100 per share (subject to appropriate  adjustment in
the event of any stock  dividend,  stock  split,  combination  or other  similar
recapitalization  affecting such shares) (the "Original Liquidation Preference")
plus with respect to any date after  December 31, 1996, an amount (which amount,
collectively with the Original Liquidation  Preference,  is hereinafter referred
to as





                                       -2-


the "Liquidation  Preference") equal to 5% per annum of the Original Liquidation
Preference  thereof  calculated  on a daily  basis from  January 1, 1996 to such
date;  provided  that  the  maximum  Liquidation  Preference  shall  not  exceed
$30,000,000.  If upon any such  liquidation,  dissolution  or  winding up of the
Corporation the remaining  assets of the Corporation  available for distribution
to its  stockholders  shall be  insufficient  to pay the  holders  of  shares of
Special  Preferred  Stock the full amount to which they shall be  entitled,  the
holders of Special  Preferred  Stock shall share ratably in any  distribution of
the  remaining  assets  and  funds  of  the  Corporation  in  proportion  to the
respective  amounts  which would  otherwise  be payable in respect of the shares
held by them upon such distribution if all amounts payable on or with respect to
such shares were paid in full.

                  (b) After the payment of all preferential  amounts required to
be paid to the holders of Senior Stock, Parity Stock and Special Preferred Stock
upon the dissolution,  liquidation or winding up of the Corporation, the holders
of shares of Junior  Stock then  outstanding  shall be  entitled  to receive the
remaining assets and funds of the Corporation  available for distribution to its
stockholders.

                  (c) Written notice of such liquidation, dissolution or winding
up, stating a payment date and the place where said payment shall be made, shall
be given by mail, postage prepaid, or by telecopier, not less than 20 days prior
to the  payment  date  stated  therein,  to the holders of record of the Special
Preferred Stock,  such notice to be addressed to each such holder at its address
as shown by the records of the Corporation.

                  (d) Whenever the  distribution  provided for in this Section 3
shall be payable in  property  other than cash,  the value of such  distribution
shall be the fair market value of such  property as  determined in good faith by
the Board of Directors of the Corporation.

                  (e) For the purposes of this Section 3, neither the  voluntary
sale, conveyance, exchange or transfer (for cash, shares of stock, securities or
other  consideration)  of all or substantially  all of the property or assets of
the Corporation nor the  consolidation  or merger of the Corporation with one or
more other  corporations  shall be deemed to be a  liquidation,  dissolution  or
winding up,  voluntary or involuntary,  unless such voluntary sale,  conveyance,
exchange  or  transfer  shall  be in  connection  with  a plan  of  liquidation,
dissolution or winding up of the business of the Corporation.





                                       -3-


                  4.       Voting.

                  (a)      Except as may be otherwise provided in these terms of
the Special Preferred Stock or by law, the Special Preferred Stock  shall not be
entitled to vote.

                  (b) The  Corporation  shall not  amend,  alter or  repeal  the
preferences, special rights or other powers of the Special Preferred Stock so as
to affect adversely the Special Preferred Stock,  without the written consent or
affirmative  vote of the holders of at least  two-thirds of the then outstanding
shares of  Special  Preferred  Stock,  given in writing or by vote at a meeting,
consenting  or  voting  (as the case  may be)  separately  as a class.  For this
purpose,  without limiting the generality of the foregoing, the authorization or
issuance of any series of Preferred  Stock with  preference or priority over the
Special Preferred Stock as to the right to receive amounts  distribut-able  upon
liquidation,  dissolution  or winding up of the  Corporation  shall be deemed to
affect adversely the Special  Preferred Stock, and the authorization or issuance
of any series of Preferred Stock on a parity with the Special Preferred Stock as
to the right to receive amounts  distributable upon liquidation,  dissolution or
winding  up of the  Corporation  shall be  deemed  not to affect  adversely  the
Special Preferred Stock.

                  5.       Redemption.

                  (a) At any time and from time to time the Corporation  may, at
the option of its Board of Directors,  redeem the Special Preferred Stock in the
manner provided below, in whole or in part, at a redemption  price equal to 100%
of the Liquidation Preference thereof on the Redemption Date (as defined below).

                  (b) The  Corporation  shall redeem all  outstanding  shares of
Special Preferred Stock on (x) the date which is 35 days after the occurrence of
a Change of Control (as defined below) and, in any event,  on (z) March 31, 2007
in each such case in the manner  provided  below at a redemption  price equal to
100% of the Liquidation Preference thereof on the Redemption Date.

                  (c) On March 31 of each year,  commencing with March 31, 1997,
the  Corporation  shall  redeem  at a  redemption  price  equal  to  100% of the
Liquidation  Preference thereof on such Redemption Date an amount (the "Required
Redemption  Amount") of Special  Preferred Stock equal to 50% of the amount,  if
any, by which the consolidated  EBITDA (as defined below) of the Corporation and
its  subsidiaries   exceeds  the  Threshold  Amount  set  forth  below  for  the
immediately preceding year ended on





                                       -4-



December 31. To the extent the Required Redemption Amount exceeds 50% of the sum
(the "Income  Limitation") of (i) the consolidated net income of the Corporation
and its  subsidiaries  for the  immediately  preceding year ended on December 31
(without deducting therefrom any amounts on account of dividends paid or payable
on any preferred stock or redemptions of any preferred stock of the Corporation,
including,   without  limitation,   the  Convertible  Preferred  Stock,  Special
Preferred  Stock  and  Series  C  and  D  classes  of  Preferred  Stock  of  the
Corporation)  plus (ii) amounts  attributable to the amortization of goodwill of
the Corporation and its subsidiaries  for such immediately  preceding year, such
excess amount shall be carried  forward and be considered a Required  Redemption
Amount for the next succeeding year and for each year thereafter until paid.

       The Threshold Amount for each year shall be as follows:



               Year Ended                                           Threshold
               December 31,                                           Amount

                                                                          
                  1996.........................................    $47.0 million
                  1997.........................................     53.0 million
                  1998.........................................     57.5 million
                  1999.........................................     60.5 million
                  2000.........................................     63.5 million
                  2001.........................................     66.5 million
                  2002.........................................     69.5 million
                  2003.........................................     72.5 million
                  2004.........................................     75.5 million
                  2005.........................................     78.5 million
                  2006 and thereafter..........................     81.5 million


"EBITDA" means net income plus income taxes, interest expense,  depreciation and
amoritization.  In the event that the  Corporation  or any  subsidiary  sells or
disposes of any material asset or business ("material" meaning having a value of
$250,000 or more),  the Threshold  Amount for each year  thereafter as set forth
above  shall be reduced by the  amount of EBITDA  attributable  to such asset or
business  for the  four  fiscal  quarters  immediately  preceding  such  sale or
disposition. All accounting terms used in this paragraph (c) shall be determined
in accordance with generally accepted accounting principles consistently applied
as in effect in the United States from time to time.

                  (d)  At  least  30  days  prior  to the  date  fixed  for  any
redemption  of  Special  Preferred  Stock   (hereinafter   referred  to  as  the
"Redemption Date"), written notice (the "Redemption Notice")





                                       -5-



shall be mailed,  by first class or registered mail,  postage  prepaid,  to each
holder of record of Special Preferred Stock to be redeemed,  at its address last
shown on the records of the transfer  agent of the Special  Preferred  Stock (or
the records of the  Corporation,  if it serves as its own transfer  agent).  The
Redemption Notice shall state:

                  (1) whether  the  redemption  is  pursuant to Section  (5)(a),
         (5)(b)(x), (5)(b)(z) or 5(c) hereof;

                  (2) the redemption price thereof;

                  (3) whether all or less than all the outstanding shares of the
         Special  Preferred Stock  redeemable  thereunder are to be redeemed and
         the  total  number  of shares of such  Special  Preferred  Stock  being
         redeemed;

                  (4) the number of shares of Special  Preferred  Stock held, as
         of the  appropriate  record  date,  by the holder that the  Corporation
         intends to redeem;

                  (5) the date fixed for redemption (the "Redemption Date"); and

                  (6) that the holder is to surrender to the Corporation, at the
         place or places  where  certificates  for shares of  Special  Preferred
         Stock are to be surrendered  for  redemption,  in the manner and at the
         price  designated,  his  certificate or certificates  representing  the
         shares of Special Preferred Stock to be redeemed.

                  (e) Each Holder of Special Preferred Stock shall surrender the
certificate or certificates  representing such shares of Special Preferred Stock
to the Corporation,  duly endorsed, in the manner and at the place designated in
the Redemption  Notice, and on the Redemption Date the full redemption price for
such shares  shall be payable in cash to the Person  whose name  appears on such
certificate  or  certificates  as  the  owner  thereof,   and  each  surrendered
certificate  shall be canceled and retired and shall not under any circumstances
be reissued.  In the event that less than all of the shares  represented  by any
such certificate are redeemed,  a new certificate  shall be issued  representing
the unredeemed shares.

                  (f) Unless the Corporation  defaults in the payment in full of
the redemption price the holders of such redeemed shares shall cease to have any
further rights with respect thereto on





                                       -6-



the Redemption  Date,  other than the right to receive the redemption price with
respect thereto, without interest.

                  (g) In the event of any  redemption of only a part of the then
outstanding   Special   Preferred  Stock,  the  Corporation  shall  effect  such
redemption  pro rata among the holders  thereof based on the number of shares of
Special  Preferred  Stock  held by such  holders  on the date of the  Redemption
Notice.

                  (h)  The  occurrence  of  any  of the  following  events  will
constitute a "Change of Control" for purposes of this Section 5:

                    (i) any "person" (as such term is used in Sections 13(d) and
         14(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
         Act"),  other than one or more Permitted Holders (as defined below), is
         or becomes  the  beneficial  owner (as defined in Rules 13d-3 and 13d-5
         under the Exchange Act except that for purposes of this clause (i) such
         person  shall be deemed to have  "beneficial  ownership"  of all shares
         that any such  person has the right to acquire,  whether  such right is
         exercisable immediately or only after the passage of time), directly or
         indirectly,  of more than 30% of the total  voting  power of the Voting
         Stock (as defined below) of the Corporation;  provided,  however,  that
         the Permitted  Holders  beneficially own (as defined in Rules 13d-3 and
         13d-5 under the Exchange Act), directly or indirectly, in the aggregate
         a lesser  percentage  of the total  voting power of the Voting Stock of
         the  Corporation  than such  other  person and do not have the right or
         ability by voting  power,  contract or  otherwise to elect or designate
         for election a majority of the Board of  Directors  of the  Corporation
         (for the  purposes  of this  clause  (i),  a person  shall be deemed to
         beneficially  own any Voting Stock of a specified  corporation  held by
         another corporation (the "parent corporation"), if such other person is
         the beneficial owner (as defined in this clause (i) above), directly or
         indirectly, of more than 30% of the voting power of the Voting Stock of
         such parent corporation and the Permitted Holders  beneficially own (as
         defined in this  clause (i)  above),  directly  or  indirectly,  in the
         aggregate a lesser  percentage  of the voting power of the Voting Stock
         of such  parent  corporation  and do not have the right or  ability  by
         voting power,  contract or otherwise to elect or designate for election
         a majority of the board of directors of such parent corporation);

                   (ii) during any two consecutive 365-day periods,  individuals
         who at the beginning of such period constituted





                                       -7-



         the  Board  of  Directors  of the  Corporation  (together  with any new
         directors  whose election by the Board of Directors of the  Corporation
         or whose nomination for election by the shareholders of the Corporation
         was approved by a vote of 66-2/3% of the  directors of the  Corporation
         then still in office who were either directors at the beginning of such
         period or whose  election or nomination  for election was previously so
         approved) cease for any reason to constitute a majority of the Board of
         Directors of the Corporation then in office; or

                  (iii) the merger or  consolidation  of the Corporation with or
         into  another  Person or the merger of another  Person with or into the
         Corporation,  or the sale of all or substantially all the assets of the
         Corporation  to another  Person (other than a Person that is controlled
         by the  Permitted  Holders),  and,  in the case of any such  merger  or
         consolidation,  the securities of the Corporation  that are outstanding
         immediately  prior to such  transaction and which represent 100% of the
         aggregate  voting  power of the  Voting  Stock of the  Corporation  are
         changed  into or exchanged  for cash,  securities  or property,  unless
         pursuant  to such  transaction  such  securities  are  changed  into or
         exchanged  for, in addition to any other  consideration,  securities of
         the  surviving   corporation  that  represent  immediately  after  such
         transaction,  at least a majority of the aggregate  voting power of the
         Voting Stock of the surviving  corporation and have the immediate right
         to  appoint a  majority  of the  Board of  Directors  of the  surviving
         corporation.

                  "Permitted   Holders"   means   Jeffrey  J.  Steiner  and  his
respective  "associates"  (as defined in Rule 12b-2 under the Exchange Act as in
effect on March 13, 1996,  except that a person shall not be an "associate"  for
purposes  of this  definition  solely  because  such  person  comes  within  the
definition  of such  term  in  clause  (a) of such  Rule)  or  their  respective
Affiliates.

                  "Affiliate" of any specified  person or entity means any other
person or entity, directly or indirectly,  controlling or controlled by or under
direct or indirect common control with such specified person or entity.  For the
purposes of this  definition,  "control" when used with respect to any person or
entity means the power to direct the  management  and policies of such person or
entity,  directly  or  indirectly,  whether  through  the  ownership  of  voting
securities,   by  contract  or  otherwise;   and  the  terms  "controlling"  and
"controlled" have meanings correlative to the foregoing.





                                       -8-


                  "Voting Stock" means,  with respect to any person,  securities
of any class or classes of capital  stock in such person  entitling  the holders
thereof  (whether  at all times or only so long as no senior  class of stock has
voting power by reason of any contingency) to vote in the election of members of
the Board of Directors or other governing body of such person.

                  6.       Certain Restrictions.

                  (a) No dividends or other  distributions  shall be declared or
paid,  set apart for  payment or  otherwise  made on any Junior  Stock or Parity
Stock for any period and no shares of any Junior  Stock or Parity Stock shall be
redeemed or  otherwise  repurchased  unless on the date such  dividend  shall be
declared,  paid,  set apart for  payment or  otherwise  made or the date of such
redemption or repurchase,  as the case may be, the  Corporation  shall have made
all payments required to be made by it pursuant to Section 5 and otherwise be in
compliance with all of its obligations hereunder.

                  (b) The  Corporation  shall not  create or permit to exist any
contractual  restriction  which  would  restrict  in any way  the  Corporation's
ability to make required payments on the Special Preferred Stock or the Series C
Preferred Stock.