DIGITAL LINK CORP
8-K, 1998-04-17
COMPUTER COMMUNICATIONS EQUIPMENT
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT



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

         Date of Report (Date of earliest event reported): April 3, 1998



                            Digital Link Corporation
                   ------------------------------------------
             (Exact name of Registrant as specified in its charter)



        California                     0-23110                   77-0067742
- ----------------------------   --------------------------   --------------------
(State or other jurisdiction    (Commission File Number)       (IRS Employer
    of incorporation)                                        Identification No.)


                 217 Humboldt Court, Sunnyvale, California 94089
          (Address of principal executive offices, including zip code)


                                 (408) 745-6200
              (Registrant's telephone number, including area code)





<PAGE>


Item 2:  Acquisition or Disposition of Assets.

         On April 3, 1998, Digital Link Corporation (the "Company") entered into
an  Asset  Sale  Agreement  (the  "Agreement")  with  Semaphore   Communications
Corporation, a Delaware corporation ("Semaphore"),  to acquire substantially all
of  Semaphore's   non-cash  assets  (excluding   furniture  and  fixtures)  (the
"Assets").  This acquisition of assets (the "Asset Acquisition") was consummated
as of such date.  Semaphore  is a supplier  of security  management  and virtual
private network solutions for  Internet/intranet  and Frame relay  applications.
The provisions of the Agreement and related agreements  described in this report
are  qualified  in  their  entirety  by  reference  to the  actual  text of such
agreements, which are incorporated by reference as exhibits to this report.

         The Assets  acquired  pursuant to the  Agreement  include  intellectual
property,   inventory,  trade  receivables  and  rights  under  certain  assumed
contracts.  Under the terms of the Agreement,  the Company issued 291,182 shares
of the Company's  Common Stock (the  "Shares") to Semaphore on April 3, 1998 and
assumed certain liabilities (the "Liabilities"). The number of Shares issued was
determined by dividing $3,200,000 by the volume-weighted average price per share
(as reported by Bloomberg  Financial  Services)  at which the  Company's  Common
Stock traded on the five  business days  immediately  preceding the execution of
the Agreement by the parties.  The Liabilities include certain obligations under
assumed  contracts  and under  various  outstanding  purchase  orders as well as
certain warranty obligations.  The Company received $182,000 from Semaphore with
respect to the assumption of certain of such Liabilities. The Agreement provides
for a contingent reduction of $250,000 in the purchase price paid by the Company
in  connection  with the  Asset  Acquisition  if  certain  rights  held by Xerox
Corporation  ("Xerox")  under a License  Agreement  dated as of December 1, 1994
between  Semaphore  and  Xerox  are  not  waived  by  Xerox  or if the  existing
non-competition  agreement  with respect to such rights is not extended  through
April  3,  2003.  In  addition,   in  connection  with  the  Asset  Acquisition,
approximately 25 of Semaphore's employees currently located in Semaphore's Santa
Clara, California headquarters are expected to become employees of the Company.

         The  amount  of  consideration   paid  in  connection  with  the  Asset
Acquisition was determined through arms' length negotiations between the parties
and their respective  assessment of the value of the Assets, the Liabilities and
the Shares. There were no material  relationships between the Company, or any of
its  affiliates,  directors  or  officers,  and  Semaphore  prior  to the  Asset
Acquisition.

         The Shares issued to Semaphore in the Asset  Acquisition were issued in
a  private  placement  pursuant  to an  exemption  from  registration  under the
Securities Act of 1933, as amended (the  "Securities  Act") and consequently can
be transferred only pursuant to an effective  registration statement filed under
the  Securities Act or an exemption from the  registration  requirements  of the
Securities  Act.  In  connection  with the Asset  Acquisition,  the  Company and
Semaphore entered into a Registration Rights Agreement (the "Registration Rights
Agreement") which grants Semaphore certain "piggyback" and "shelf"  registration
rights that are summarized below.

         Under the Registration Rights Agreement,  the Company, upon the request
of Semaphore,  is obligated to file a  registration  statement on Form S-3 for a
continuous   offering   under  Rule  415  of  the  Securities  Act  (the  "Shelf
Registration")  covering the registration of all of the Shares.  The Company has
agreed  to  cause,  as soon  as  practicable,  the  effectiveness  of the  Shelf
Registration and to continually  maintain such effectiveness until the date that
is the first  anniversary  of the closing of the Asset  Acquisition,  subject to
certain  limited   exceptions.   Any  sale  of  Shares  pursuant  to  the  Shelf
Registration may be made only during certain permitted windows, which consist of
a period of thirty  consecutive  calendar days following the Company's notice to
Semaphore  in response to a request  from  Semaphore  to sell at least 5% of the
outstanding  Shares. The Registration Rights Agreement provides for no more than
three such permitted windows.  The parties have agreed that the number of Shares
sold by Semaphore pursuant to the Shelf Registration during any calendar quarter
will not exceed 2% of the outstanding shares of the Company.

         In  addition  to  the  Shelf  Registration,   the  Registration  Rights
Agreement  provides  that in the event  that the  Company  files a  registration
statement  under  the  Securities  Act to  register  a  public  offering  of its
securities,  Semaphore  may  also  elect  to  register  the  Shares  under  such
registration statement in certain circumstances.

         The Company's  obligations to register the Shares will expire (a) after
the expiration of one year from the closing of the Asset  Acquisition;  (b) with
respect to the Shelf Registration, if the Company has already effected three (3)
permitted windows pursuant to the Registration Rights Agreement;  (c) if all the
Shares  proposed  to be sold may be sold in a three  (3)  month  period  without
registration under the Securities Act pursuant to Rule 144 promulgated under the
Securities Act or otherwise;  or (d) if all Shares have been registered and sold
pursuant  to  a  registration  effected  pursuant  to  the  Registration  Rights
Agreement  and/or have been  transferred in transactions  in which  registration
rights  have not been  assigned  in  accordance  with  the  Registration  Rights
Agreement.  Semaphore  may  assign  the  rights  under the  Registration  Rights
Agreement with the consent of the Company and under certain other circumstances.

Item 7:  Financial Statements, Pro Forma Financial Information and Exhibits.

(a)      Financial Statements of Business Acquired.

         The audited  financial  statements  of  Semaphore  required to be filed
pursuant  to Item 7(a) of Form 8-K will be filed on a Form 8-K/A  within 60 days
after the date this Form 8-K is required to be filed.

(b)      Pro Forma Financial Information.

         The pro forma  financial  information  required to be filed pursuant to
Item 7(b) of Form 8-K will be filed on a Form  8-K/A  within  60 days  after the
date this Form 8-K is required to be filed.

(c)      Exhibits.

         The following exhibits are filed herewith:

         2.01     Asset  Sale  Agreement  dated  April 3,  1998 by and among
                  Digital  Link  Corporation  and  Semaphore  Communications
                  Corporation. Pursuant to Item 601(b)(2) of Regulation S-K,
                  certain  schedules  have been omitted from this filing but
                  will be furnished  supplementally  to the Commission  upon
                  request.

         4.01     Registration  Rights  Agreement dated April 3, 1998 by and
                  among Digital Link Corporation and Semaphore Communications 
                  Corporation.



<PAGE>


                                   SIGNATURES

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





Date:  April 17, 1998                  By:   /s/ Stanley E. Kazmierczak
                                           -----------------------------
                                           Stanley E. Kazmierczak
                                           Vice President, Finance and 
                                           Administration
                                           and Chief Financial Officer



<PAGE>


                                INDEX TO EXHIBITS



      Exhibit Number         Description of Exhibit

          2.01               Asset  Sale  Agreement  dated  April 3, 1998 by and
                             among  Digital  Link   Corporation   and  Semaphore
                             Communications   Corporation.   Pursuant   to  Item
                             601(b)(2) of Regulation S-K, certain schedules have
                             been omitted from this filing but will be furnished
                             supplementally to the Commission upon request.

          4.01               Registration  Rights  Agreement dated April 3, 1998
                             by and among Digital Link Corporation and Semaphore
                             Communications Corporation.
          


                                                                 Exhibit 2.01

                              ASSET SALE AGREEMENT

         This ASSET SALE  AGREEMENT  is made and entered into April 3, 1998 (the
"Closing  Date"),  by  and  between  Digital  Link  Corporation,   a  California
corporation  ("Buyer")  and  Semaphore  Communications  Corporation,  a Delaware
corporation ("Seller"). Seller's Federal identification number is 06-1313436 and
Buyer's federal tax identification number is 77-0067742.

                           PURCHASE AND SALE OF ASSETS

         1.1  Purchased  Assets.  Upon the terms and  subject to the  conditions
contained herein, Seller hereby sells, conveys, transfers,  assigns and delivers
to  Buyer  all its  right  title  and  interest  in the  Purchased  Assets.  The
"Purchased Assets" are all of the assets listed below:

                  (a)  All  of  Seller's  rights  in  the  "Seller  Intellectual
         Property" as defined in Schedule 1.1A.

                  (b) All of  Seller's  rights  in the  word  "Semaphore".  Even
         though  Seller is  assigning  all its  rights in the name  "Semaphore",
         Seller  shall have three (3) months  after the  Closing  Date Seller to
         change  its  corporate  name to a name  which  does  not  use the  word
         "Semaphore"  or any  confusingly  similar name.  After such three month
         period Seller shall not retain any rights to the name "Semaphore".

                  (c) The  Seller's  inventory  of  finished  products,  work in
         process and spare parts as evidenced by the inventory  listing attached
         as Schedule 1.1C (the  "Inventory").  The Inventory includes a finished
         goods  inventory  of not less than 581 IOENI  adapter  boards,  36 SMDS
         adaptor units and 1150 Roadrunner chips.

                  (d) The  equipment  and  other  assets  (excluding  furniture,
         fixtures and leasehold  improvements) as evidenced by the list attached
         as Schedule 1.1D (the "Fixed Assets").

                  (e) All Seller's  rights in the Assumed  Contracts (as defined
         in Section 1.3).

                  (f)      [Intentionally deleted]

                  (g)  Marketing  and  sales  material,   including   brochures,
         displays,   models,   demonstration   equipment,   training  materials,
         advertising material, product documentation,  support materials, books,
         records,  files and  papers  related  to the  portion  of the  Business
         represented by the Purchased  Assets  including  drawings,  engineering
         information,   computer  programs  (including  source  code),  software
         programs,  manuals and data, sales and advertising materials, sales and
         purchases   correspondence,   trade  association  files,  research  and
         development  records,   lists  of  present  and  former  customers  and
         suppliers,  and copies and  recordings of the foregoing (the "Books and
         Records");

                  (h)  The  goodwill  of  the  Seller  in  connection  with  the
         Purchased Assets.

                  (i) The trade  receivables of Seller attached as Schedule 1.1I
         ("Receivables").

                  (j) The benefit of any  pre-paid  assets on  Seller's  balance
         sheet  as of the  Closing  Date  (to the  extent  same  pertain  to the
         Purchased Assets or Assumed Contracts) attached as Schedule 1.1J.

                  (k) To the extent  assignable,  all rights and interests under
         or pursuant to all warranties, representations and guarantees, express,
         implied or  otherwise,  of or made by suppliers or others in connection
         with the Purchased Assets or the Assumed Liabilities and Obligations.

For purposes of this Agreement,  "Business" means the business carried on by the
Seller which primarily involves development,  marketing,  distribution, sale and
servicing  of  the  Software  and  those  products  in  which  the  Software  is
incorporated  and "Related to the Business"  means used  primarily  in,  arising
primarily from, or relating primarily to the Business.

         1.2  Excluded   Assets.   Anything  in  Section  1.1  to  the  contrary
notwithstanding, there shall be excluded from the assets, properties, rights and
business to be transferred  to the Buyer  hereunder  cash,  securities and other
cash equivalents and any assets that are not Purchased Assets (collectively, the
"Excluded Assets").

         1.3 Assumed  Liabilities and  Obligations.  Effective the Closing Date,
Buyer  assumes and agrees to discharge in a due and timely  manner the following
liabilities and obligations  (the "Assumed  Liabilities and  Obligations").  For
purposes of this Agreement,  "Liabilities"  and  "Obligations"  means all costs,
expenses, charges, debts, liabilities,  claims, demands and obligations, whether
primary  or  secondary,  direct or  indirect,  fixed,  contingent,  absolute  or
otherwise, under or in respect of any contract, agreement,  arrangement,  lease,
commitment, undertaking, law or tax.

                  (a) Seller's  obligations under the Assumed Contracts.  
         "Assumed Contracts" are those contracts and agreements listed on 
         Schedule 1.3A.

                  (b) Buyer will assume Seller's warranty  obligations stated in
         the  Termination  Agreement  between MCM Japan Ltd. and Seller dated 24
         March 1998 ("MCM  Settlement  Agreement").  At the Closing Seller shall
         pay Buyer  $182,000  in  consideration  of  Buyer's  on-going  customer
         supports  efforts  and Buyer  assuming  this  obligation  and the other
         Assumed Contracts.

                  (c) Buyer will assume Seller's  responsibility  to deliver (1)
         the  remaining  36 SMDS units to British  Telecom  that are included in
         Data Innovation  Limited's  (Zergo) Purchase Order W548 and (2) the 581
         units of product as stated in the MCM Settlement Agreement. Buyer shall
         be entitled to amounts paid by the customer  respecting the delivery of
         "(1)" above but Seller  shall be  entitled  to the amounts  paid by the
         customer respecting the units of "(2)" above.

                  (d)  Buyer  shall  assume  Seller's   obligations   under  the
         outstanding  purchase  orders  issued  to  Seller's  vendors  listed on
         Schedule 1.3D.

Seller transfers and assigns to Buyer the Assumed  Contracts and all of Seller's
rights  therein,  and Buyer assumes and agrees to perform and discharge in a due
and timely manner the obligations of Seller  pursuant to the Assumed  Contracts.
To the  extent  that the  assignment  of any of the  Assumed  Contracts  are not
permitted  without the consent or  approval of another  party to such  contract,
this  Agreement  shall not be  deemed to be an  assignment  of same  until  such
consent or approval is given.  After the Closing  Date and until all such rights
are transferred to the Buyer, the Seller shall:

                  (1)  maintain its existence and hold the rights in trust for
         the Buyer;

                  (2)  comply  with the terms and  provisions  of the  rights as
         agent for the Buyer at the Buyer's cost and for the Buyer's benefit;

                  (3)  cooperate  with the Buyer in any  reasonable  and  lawful
         arrangements  designed  to provide  the  benefits of such rights to the
         Buyer; and

                  (4)  enforce,  at the  request of the Buyer and at the expense
         and for the account of the Buyer, any rights of the Seller arising from
         such rights  against any third person,  including the right to elect to
         terminate any such rights in  accordance  with the terms of such rights
         upon the written direction of the Buyer.

In order that the full value of the rights may be  realized  for the  benefit of
the Buyer,  the Seller shall, at the request and expense and under the direction
of the Buyer,  in the name of the Seller or  otherwise as the Buyer may specify,
take  all such  action  and do or  cause  to be done  all  such  things  as are,
reasonable  and necessary or proper in order that the  obligations of the Seller
under such rights may be  performed in such manner that the value of such rights
is preserved and enures to the benefit of the Buyer, and that any moneys due and
payable  and to become due and  payable to the Buyer in and under the rights are
received by the Buyer.  The Seller  shall  promptly  pay to the Buyer all moneys
collected  by or paid to the Seller in respect  of every such  right.  The Buyer
shall indemnify and hold the Seller harmless from and against any cost, expense,
claim or  liability  under or in respect of such rights  arising  because of any
action of the Seller taken pursuant to this Section.

         1.4 Excluded Liabilities and Obligations. Except as expressly set forth
in  Section  1.3  above,  Buyer  does not assume and shall not be liable for any
debt,   Obligation,   responsibility  or  Liability  of  Seller  (the  "Excluded
Liabilities and Obligations"). In particular, and for the avoidance of doubt but
without limiting the foregoing, Buyer shall have no right or responsibility with
respect to the following:

                  (a)      Cancellation of DEC Purchase Order #18096.

                  (b) Any  agreements or  arrangements  between Seller and Intel
concerning Roadrunner technology.

                  (c)  Except as  provided  in Section  1.3(b) and (c),  the MCM
Settlement Agreement.

                  (d) Any agreements or arrangements between Seller and Dovatron
International.

                  (e) Any agreements or arrangements between Seller and Forsythe
Technologies.



<PAGE>


                              FINANCIAL ARRANGEMENT

         2.1 Purchase  Price.  At the Closing on the Closing  Date,  Buyer shall
issue to Seller  291,182  shares of Buyer's  common stock which is the number of
shares calculated by dividing $3,200,000 divided by the volume-weighted  average
price per share (as reported by Bloomberg  Financial  Services) at which Buyer's
common stock  traded on the five (5) business  days  immediately  preceding  the
Closing Date.  The said shares are referred to herein as the  "Purchase  Price".
Buyer has  granted  certain  registration  rights in the  Shares  pursuant  to a
Registration  Rights  Agreement  dated  the date of this  Agreement.  Except  as
otherwise  provided in Article 4 the Purchased Assets are being  transferred and
sold "as is" "where is". In particular, and subject to Section 2.10, there shall
not be an adjustment  in the Purchase  Price (either an increase or decrease) if
any assets cannot be located or are in poor  condition,  or if any assets have a
fair market value which is more or less than book value,  or if the  Receivables
are collected in amounts greater or less than the value less reserves  reflected
on Seller's books.

         2.2 Assumed  Contracts.  (1) As provided above, Buyer is purchasing the
Receivables  and the right to receive all amounts due from  customers  under the
Assumed  Contracts.  However,  and subject to Section  2.2(2),  Seller  shall be
entitled to retain all amounts received prior to the Closing Date from customers
pursuant to the  Assumed  Contracts  even if the amount  received  pertained  to
services to be performed after the Closing Date.

         (2) Buyer  shall  assume  Seller's  obligations  under the  outstanding
purchase orders from Seller's  customers  listed on Schedule 2.2. Buyer shall be
entitled to all amounts  received  from  customers  in respect of such  purchase
orders.

         2.3  SMDS   Product.   The   parties   agree   that   British   Telecom
unconditionally  accepted the Seller's SMDS product  which  satisfies one of the
conditions communicated by the Buyer to the Seller with respect to the execution
of this Agreement.

         2.4 Digital Storage Scope. Seller shall promptly exercise the option to
purchase for $1.00 the  TEK/TDS754A  Digital  Storage Scope ("DSS") leased for a
term of twelve months from AT&T Capital Services  Corporation  ("AT&T") pursuant
to an  Alternative  Purchase  Plan  agreement  dated March 4, 1997.  When Seller
acquires  title to the DSS title shall  transfer to Buyer without any additional
consideration.  Seller  will  secure  the  release  of the UCC-1  filing by AT&T
respecting the DSS.

         2.5 Purchase Price Allocation.  The Purchase Price shall be allocated
among the Purchased Assets as set forth on Schedule 2.5.

         2.6 Tax.  (a) Buyer is  purchasing  the  Software  for the  purpose  of
reproducing  and  reselling  copies of the  Software by Buyer and not for use or
consumption. Seller shall deliver to Buyer possession of the Seller Intellectual
Property,  including documentation and other tangible manifestations thereof, at
Seller's office in Santa Clara, California.

         (b)      Buyer shall be responsible for paying sales tax applicable to
this Agreement.

         (c) Buyer shall be  responsible  for all property and use taxes imposed
or assessed upon the Purchased  Assets with assessment  dates  subsequent to the
Closing Date.

         2.7 Real Estate.  (a) Seller is  conducting  business in  approximately
10,000  square feet of a facility  ("Facility")  located at 4000  Burton  Drive,
Santa Clara,  California  pursuant to a lease  ("Lease")  dated  January 3, 1996
between Seller and  Koll/Intereal  Bay Area, a California  general  partnership.
Subject to any required landlord consent and compliance by Buyer with the Lease,
Seller  gives Buyer  permission  to keep the  Purchased  Assets and  Transferred
Employees  in the  Facility  during a  transition  period  until not later  than
December 31, 1998. Buyer shall be financially responsible for amounts payable to
the  landlord  based the same  financial  and  other  terms  and  conditions  as
currently applicable to Seller.  Buyer shall be financially  responsible for its
operating  expenses such as office supplies and telephone calls (including lease
payments to Leasepartners for the Toshiba Strata DK280 and Octel 200SX equipment
but there shall not be a charge to Buyer for use of Seller's telephone sets).

         (b) As an  alternative  to 2.7(a) Buyer may elect,  by notice to Seller
given on or before  April 15, 1998 to have the  following  arrangement  apply in
lieu of Section 2.7(a).  Subject to any required landlord  consent,  Seller will
give Buyer permission to keep the Purchased Assets and Transferred  Employees in
the Facility during a transition  period until June 30, 1998. During this period
Seller will continue to be  financially  responsible  for the lease payments and
charges  due to the  landlord  of  the  Facility.  Buyer  shall  be  financially
responsible  for its operating  expenses  such as office  supplies and telephone
calls (including  lease payments to  Leasepartners  for the Toshiba Strata DK280
and Octel  200SX  equipment  but there shall not be a charge to Buyer for use of
Seller's  telephone sets).  After June 30, 1998 Buyer may not keep the Purchased
Assets and Transferred Employees in the Facility.

         2.8 ITL.  Seller  shall be  financially  responsible  for work  done by
Infosys  Technologies  Ltd. through April 3, 1998 and Buyer shall be financially
responsible for work done thereafter.

         2.9  Shares  and  Proceeds.  For not less than one year  following  the
Closing  Seller shall retain the Shares,  and any proceeds  from the sale of the
Shares  should  Seller sell any of the Shares,  and,  in  particular,  shall not
distribute  the Shares  (including  any proceeds from the sale of any Shares) to
its stockholders  unless,  in any case, Xerox  Corporation  ("Xerox")  (Seller's
majority stockholder) shall first fund the Seller with cash or a promissory note
of Xerox in an amount, or having a face value in an amount, of not less than the
value of the Shares or proceeds distributed or otherwise not retained.

         2.10 Contingent Reduction in Purchase Price.  Reference is made to that
certain  License  Agreement  dated and  effective as of December 1, 1994 between
Seller and Xerox  Corporation  ("Xerox") (the "SCC License").  If by May 1, 1998
Xerox has not agreed to do either  "(a)" or "(b)"  below  Seller  will pay Buyer
$250,000 and such amount shall be an  adjustment  in the  Purchase  Price.  This
paragraph shall not apply if:

         (a) Xerox  agrees to amend the  non-competition  Section 5.1 of the SCC
License to make the clause  apply for five years  following  the Closing so that
the first clause of Section 5.1 shall then read "During the period through April
3, 2003, Xerox . . . ", or

         (b)  Xerox  agrees  to amend  the SCC  License  to  Buyer's  reasonable
satisfaction  to the effect that Xerox will have no grant back rights  under the
SCC License.

                                   THE CLOSING

         3.1 Closing.  The closing ("Closing") of the transactions  contemplated
by the  Agreement is taking  place  contemporaneous  with the  execution of this
Agreement.  The  execution  of this  Agreement  shall  operate  as an  effective
conveyance,  assignment  and transfer of the  Purchased  Assets as  contemplated
herein  effective as of the Closing Date.  However,  in order to effectuate more
fully and  completely the  assignment,  transfer and conveyance of the Purchased
Assets   pursuant   to  the   terms  and   conditions   hereof,   Seller   shall
contemporaneously  with the execution  hereof or upon  reasonable  request after
execution  hereof,  deliver  to  Buyer  such  bills  of  sale,  assignments  and
instruments of conveyance as requested by Buyer,  acting  reasonably,  to permit
the assignment, transfer and conveyance from Seller to Buyer and the acquisition
by Buyer  from  Seller of all  right,  title and  interest  in, to and under the
Purchased Assets, the whole with effect as of the Closing.

         3.2 Deliveries by the Parties. At the Closing the parties shall deliver
the following in addition to this Agreement and the schedules hereto:

                  (1)      Buyer shall deliver to Seller the Shares.

                  (2)  Seller  shall  deliver  to Buyer a cheque  in the  amount
specified in Section 1.3(b).

                  (3)  Buyer  and  Seller  shall   deliver  to  each  other  the
Registration Right Agreement.

                  (4) Seller shall deliver to Buyer  physical  possession of the
         Purchased  Assets  which  shall be at Seller's  office in Santa  Clara,
         California.  To the extent  physical  assets are located  other than at
         Seller's office they shall be deemed  delivered to Buyer on the Closing
         Date "where is".  Buyer shall have the right,  at its cost, to relocate
         any Purchased Assets to a site of its choice.

                  (5) Buyer shall  deliver to Seller a re-sale  certificate  for
the Software and Inventory.

Also at the  Closing  Buyer  and Xerox  delivered  to each  other an  Assignment
Agreement dated April 3, 1998 and Xerox delivered to Buyer a Waiver agreement.

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Seller  represents  and  warrants  to Buyer as of the  Closing  Date as
follows:

         4.1  Validity.  Seller  is a  corporation  duly  incorporated,  validly
existing  and in good  standing  under the laws of the State of Delaware and has
full  corporate  power  and  authority  to  execute,  deliver  and  perform  its
obligations  under this Agreement and all other agreements and instruments to be
executed by it as contemplated by this Agreement, and this Agreement constitutes
the legal, valid and binding agreement of Seller, enforceable in accordance with
its  terms.  The  execution  and  delivery  of this  Agreement  and  such  other
agreements and instruments and the completion of the  transactions  contemplated
by this  Agreement  and such other  agreements  and  instruments  have been duly
authorized by all necessary  corporate  action on the part of the Seller and its
shareholders.  The  execution  and  delivery of this  Agreement  do not, and the
undertaking of the transactions and obligations contemplated to be undertaken by
Seller hereunder will not,  subject to (a) Section 1.3 respecting  assignment of
Assumed Contracts,  (b) the approval and consent of Seller's stockholders (which
approval and consent has been  obtained)  and (c) landlord  consents (i) violate
any provision of the  Certificate of  Incorporation  or By Laws of Seller or any
statute, judgment, order, decree, injunction,  regulation or ruling of any court
or governmental  authority  applicable to Seller; (ii) result in or constitute a
default,  breach or violation or an event that,  with notice or lapse of time or
both, would be a default, breach or violation of any of the terms, conditions or
provisions of any Assumed Contract; (iii) constitute an event which, pursuant to
the terms of any Assumed Contract, causes any right or interest of the Seller to
come to an end or be  affected  in any way  that is  materially  adverse  to the
portion of the Business  represented by the Purchased Assets; (iv) result in the
creation or imposition  of any lien on any  Purchased  Asset that is material to
the portion of the Business  represented by the Purchased Assets; (v) constitute
the violation of any  applicable law applicable to or affecting the Seller which
is Related to the portion of the Business  represented  by the Purchased  Assets
and  would  have a  material  adverse  effect  on the  portion  of the  Business
represented  by the  Purchased  Assets.  Subject to (a) Section  1.3  respecting
assignment  of Assumed  Contracts,  (b) the  approval  and  consent of  Seller's
stockholders  (which  approval and consent has been  obtained)  and (c) landlord
consents,  (x) none of the  actions on the part of Seller  contemplated  by this
Agreement or (y) the conduct of the portion of the Business  represented  by the
Purchased  Assets by Buyer after the Closing as that  portion of the Business is
currently  carried on by the Seller,  are subject to the  approval or consent of
any person or entity not a party to this Agreement and no authorization, consent
or approval  of, or filing with,  any public body or authority is necessary  for
the consummation by Seller of the transactions contemplated by this Agreement.

         4.2 Warranty. Seller warrants to Buyer that Buyer will acquire good and
marketable title in the Purchased Assets free of any security  interest or other
lien or encumbrance. However, there exists a dispute with Intel concerning title
to the  Roadrunner  chips  and  Seller  makes  no  warranty  as to  title to the
Roadrunner  chips included in the Inventory.  Seller transfers to Buyer whatever
rights of ownership it has in the  Roadrunner  chips  including any title Seller
may acquire to such chips in the future.  Should  Seller or Buyer be required to
purchase the  Roadrunner  chips from Intel Seller shall be  responsible  for any
payments to Intel.

         4.3  Investment.  Seller is acquiring the Shares for investment for its
own account and not with a view to the public  resale or  distribution  of same.
Seller has no present  intention of selling,  granting any  participation in, or
otherwise distributing the Shares. Seller has received or has had full access to
all the  information  it considers  necessary or appropriate to make an informed
investment  decision  with respect to the Shares to be acquired by it under this
Agreement.  Seller  further has had an  opportunity to ask questions and receive
answers from the Buyer regarding the terms and conditions of the offering of the
Shares and to obtain  additional  information (to the extent the Buyer possessed
such  information  or could acquire it without  unreasonable  effort or expense)
necessary to verify any information  furnished to Seller or to which such Seller
had access.  Seller  understands  that the  acquisition  of the Shares  involves
substantial risk and, by reason of Seller's  business and financial  experience,
is capable of evaluating the merits and risks of the  acquisition of the Shares,
has the ability to protect its own interests in this transaction and financially
capable  of  bearing a total loss of the  investment.  Seller has a  preexisting
business  relationship  with Buyer and  certain of its  officers,  directors  or
controlling  persons of a nature and duration that enables Seller to be aware of
the  character,  business  acumen and financial  circumstances  of such persons.
Seller  is  an  "accredited   investor"  within  the  meaning  of  Regulation  D
promulgated under the 1933 Act. Seller understands that the Shares have not been
registered  under the Securities  Act of 1933 and may not be transferred  except
pursuant to the Securities Act of 1933 or an exemption  therefrom or pursuant to
the Registration Rights Agreement. In this connection, Seller represents that it
is familiar  with Rule 144  promulgated  under the  Securities  Act of 1933,  as
presently in effect, and understands the resale limitations  imposed thereby and
by such Act.

         Seller  understands  and  agrees  that the  Shares  shall bear a legend
substantially as follows:

         THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
         SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR UNDER THE SECURITIES
         LAWS OF CERTAIN STATES. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON
         TRANSFERABILITY  AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT
         AS PERMITTED UNDER THE ACT AND THE APPLICABLE  STATE  SECURITIES  LAWS,
         PURSUANT TO REGISTRATION OR EXEMPTION  THEREFROM.  INVESTORS  SHOULD BE
         AWARE THAT THEY MAY BE  REQUIRED  TO BEAR THE  FINANCIAL  RISKS OF THIS
         INVESTMENT  FOR AN  INDEFINITE  PERIOD  OF TIME.  THE  ISSUER  OF THESE
         SECURITIES  MAY  REQUIRE AN  OPINION  OF COUNSEL IN FORM AND  SUBSTANCE
         SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED  TRANSFER OR
         RESALE  IS  IN  COMPLIANCE  WITH  THE  ACT  AND  ANY  APPLICABLE  STATE
         SECURITIES LAWS.

         4.4      Seller Intellectual Property.

                  (a) The Seller Intellectual  Property and Software is owned by
         the Seller free and clear of all liens.

                  (b) There is no current or threatened  litigation  relating to
         the Seller Intellectual  Property or Software that would be material to
         the  portion of the Business represented by the Purchased Assets.

                  (c) To  Seller's  knowledge,  no  person  has  challenged  the
         validity of Seller's rights to any of the Seller Intellectual  Property
         or  Software.  To  Seller's  knowledge,  no person  has  infringed  the
         Seller's rights to the Seller Intellectual Property or Software.

                  (d) Seller is not  obligated  to pay any  compensation  to any
         person in respect of the use of the Seller  Intellectual  Property  and
         Software.

                  (e)  Subject  to  Schedule  1.1A,  Seller  has  the  exclusive
         ownership  of the Seller  Intellectual  Property  and  Software and the
         right to assign the Seller Intellectual Property and Software to Buyer.

                  (f) To Seller's knowledge,  the Seller  Intellectual  Property
         and the Software do not infringe the intellectual  property rights of a
         third party.

                  (g) Schedule 1.1A  discloses all the third party rights in the
         Seller Intellectual Property and the Software.

         4.5      Disclaimer of Warranty.  EXCEPT AS SET FORTH IN SECTIONS 4.2 
AND 4.4 THE PURCHASED ASSETS ARE SOLD ON AN "AS IS" "WHERE IS" BASIS.

EXCEPT AS SET FORTH IN SECTIONS 4.2 AND 4.4 SELLER MAKES NO WARRANTY, EXPRESS OR
IMPLIED,  CONCERNING THE PURCHASED ASSETS  INCLUDING,  WITHOUT  LIMITATION,  ANY
WARRANTY OR REPRESENTATION AS TO  MERCHANTABILITY  OR FITNESS FOR ANY PARTICULAR
PURPOSE, AND BUYER HEREBY WAIVES RELIANCE UPON ANY EXPRESS OR IMPLIED COVENANTS,
REPRESENTATIONS  OR  WARRANTIES  INCLUDING  FITNESS FOR A PARTICULAR  PURPOSE OR
MERCHANTABILITY.

                  4.6   Survival  of   Representations   and   Warranties.   The
representations  and  warranties of the Seller  contained in Section 4.1 through
4.5 or any other agreement, certificate or instrument delivered pursuant to this
Agreement  shall  survive  the  Closing  Date for a period  of one year from the
Closing  Date,  and  notwithstanding  the  Closing  Date and any  inspection  or
inquiries  made by or on behalf of the Buyer,  shall  continue in full force and
effect  for the  benefit  of the Buyer,  after  which  time the Seller  shall be
released from all obligations in respect of such  representations and warranties
except with respect to any claims asserted by the Buyer in writing  (setting out
in reasonable detail the nature of the claim and the approximate  amount of such
claim) before the expiration of such period, but there shall be no time limit on
the  representations  and  warranties of the Seller set out in Section 4.1 which
relate  to the  incorporation  of the  Seller,  the  due  authorization  of this
Agreement by the Seller or the enforceability of the Seller's  obligations under
this Agreement.

                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer hereby  represents  and warrants to Seller as of the Closing Date
as follows:

         5.1  Validity.  Buyer  is  a  corporation  duly  incorporated,  validly
existing and in good standing  under the laws of the State of California and has
full  corporate  power  and  authority  to  execute,  deliver  and  perform  its
obligations  under this Agreement and all other agreements and instruments to be
executed by it as contemplated by this Agreement, and this Agreement constitutes
the legal, valid and binding agreement of Buyer,  enforceable in accordance with
its  terms.  The  execution  and  delivery  of this  Agreement  and  such  other
agreements and instruments and the completion of the  transactions  contemplated
by this  Agreement  and such other  agreements  and  instruments  have been duly
authorized  by all  necessary  corporate  action on the part of the  Buyer.  The
execution  and delivery of this  Agreement do not,  and the  undertaking  of the
transactions  and  obligations  contemplated to be undertaken by Buyer hereunder
will not, (i) violate any provision of the  Certificate of  Incorporation  or By
Laws of Buyer or any statute, judgment, order, decree, injunction, regulation or
ruling of any court or  governmental  authority  applicable to Buyer.  Except as
provided in Section 1.3 respecting assignment of Assumed Contracts,  none of the
actions on the part of Buyer  contemplated  by this Agreement are subject to the
approval or consent of any person or entity not a party to this Agreement and no
authorization,  consent or  approval  of, or filing  with,  any  public  body or
authority  is  necessary  for the  consummation  by  Buyer  of the  transactions
contemplated by this Agreement.

         5.2 Issuance of Shares. (a) Upon consummation of the Closing the Shares
will be duly authorized,  validly issued,  fully paid and non-assessable and not
subject to preemptive or similar rights of security holders of Buyer.

 (b) Since January 1, 1996,  Buyer has made all filings with the  Securities and
Exchange  Commission that have been required to be made under the Securities Act
of 1933 and the  Securities  Exchange  Act of 1934  (collectively,  the  "Public
Reports").  Each of the Public  Reports  complied with the  requirements  of the
Securities Act of 1933 and the  Securities  Exchange Act of 1934 in all material
respects and none of the Public Reports, as of their respective dates, contained
any  untrue  statement  of a material  fact or omitted to state a material  fact
necessary  in  order  to make  the  statements  made  therein,  in  light of the
circumstances  under  which  they  were  made,  not  misleading.  The  financial
statements  included  in the Public  Reports  were  prepared  from the books and
records of Buyer in accordance  with generally  accepted  accounting  principles
applied on a consistent basis throughout the periods covered thereby and present
fairly  in  all  material  respects  the  financial  condition  Buyer  as of the
indicated  dates and the results of  operations  and cash flows of Buyer for the
indicated periods.

         5.3 Survival of Representations and Warranties. The representations and
warranties  of the  Buyer  contained  in  Sections  5.1  and  5.2  or any  other
agreement,  certificate or instrument delivered pursuant to this Agreement shall
survive the Closing  Date for a period of one year from the  Closing  Date,  and
notwithstanding  the Closing Date,  shall  continue in full force and effect for
the benefit of the Seller, after which time the Buyer shall be released from all
obligations  in respect  of such  representations  and  warranties  except  with
respect  to any  claims  asserted  by the  Seller  in  writing  (setting  out in
reasonable  detail the nature of the claim and the  approximate  amount thereof)
before the  expiration  of such period,  but there shall be no time limit on the
representations  and warranties of the Buyer set out in Section 4.1 which relate
to the  incorporation of the Buyer,  the due  authorization of this Agreement by
the  Buyer  and  the  enforceability  of  the  Buyer's  obligations  under  this
Agreement.

                     COVENANTS AND AGREEMENTS OF THE PARTIES

         6.1 Continued Assistance.  Following the Closing, Seller shall refer to
Buyer as promptly as practicable any telephone calls, letters,  orders, notices,
requests, inquiries and other communications relating to the Purchased Assets or
Assumed  Contracts.  Seller  shall  cooperate  in an  orderly  transfer  of  the
Purchased Assets.  From time to time, at Buyer's  reasonable request and without
further  consideration,  Seller  shall  execute,  acknowledge  and deliver  such
documents,  instruments  or  assurances  and take such other action as Buyer may
reasonably  request to more effectively  assign,  convey and transfer any of the
Purchased Assets.

         6.2 Records and  Documents.  For six years  following the Closing Date,
Buyer grants to Seller and its representatives,  at Seller's reasonable request,
access to  employees of Seller  hired by Buyer and those  records and  documents
(including the right to make copies thereof), possession of which is transferred
to Buyer, as may be necessary in connection with Seller's obligations  hereunder
and the conduct after the Closing of the affairs of Seller.

         6.3  Bulk  Sales  Act.  Buyer  waives  compliance  by  Seller  with the
provisions  of Article 6 of the Uniform  Commercial  Code,  or  equivalent  bulk
transfer laws, of any applicable state. Seller shall indemnify and hold harmless
Buyer from and against any and all expense,  loss or  liability  which Buyer may
suffer as a result of claims  asserted by third parties against Buyer due to any
noncompliance by Seller and Buyer with applicable bulk transfer laws.

         6.4  Roadrunner  chips.  Roadrunner  chips  will be used by Buyer  only
installed  in  products  and  may  not be  sold  or  used  individually.  As any
agreements  or  arrangements  between  Seller  and Intel  concerning  Roadrunner
technology is an Excluded  Liability  compliance  with this covenant is the only
obligation Buyer has respecting same.

         6.5 Audit  Assistance.  Seller  understands  that  Buyer's  independent
auditors desire to conclude an audit of the Business in April,  1998. Such audit
shall be at Buyer's cost. Seller agrees to cooperate in the conduct of the audit
as reasonably requested by Buyer.

         6.6      UCC Filings. Seller will promptly secure the release of the 
UCC-1 filing covering the Purchased Assets.

                   INDEMNIFICATION AND LIMITATION OF LIABILITY

         7.1 Seller Indemnification. Seller indemnifies Buyer and its directors,
officers, employees, agents, representatives and affiliates from and against any
Liability,  loss or claim, and all costs thereof, incurred in respect of (1) any
Excluded Assets and any Excluded Liabilities and Obligations,  (2) the breach by
Seller of any representations,  warranties or covenants of this Agreement or any
other agreement,  certificate or instrument  executed and delivered  pursuant to
this  Agreement,  (3) the  indemnity  of Section 6.3 and (4) any claim by either
SNMP Research or  Accelerated  Technologies  either (x) that  Seller's  products
infringe their respective  intellectual property rights or (y) that there is any
royalty or other payment owed by Seller to them concerning intellectual property
licensed from them by Seller.

         7.2 Buyer Indemnification.  Buyer indemnifies Seller and its directors,
officers, employees, agents, representatives and affiliates from and against any
Liability,  loss or claim, and all costs thereof, incurred in respect of (1) any
Assumed  Liabilities  and  Obligations  or the ownership or use of the Purchased
Assets,  each occurring or accruing after the Closing Date and (2) the breach by
Buyer of any  representations,  warranties or covenants of this Agreement or any
other agreement,  certificate or instrument  executed and delivered  pursuant to
this  Agreement and (3) the indemnity of the last sentence of the last paragraph
of Section 1.3.

         7.3  Limitation  of  Liability.  NO PARTY SHALL BE LIABLE FOR PUNITIVE,
INDIRECT,  INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS)
ARISING UNDER OR RELATING TO THIS  AGREEMENT  EVEN IF THE PARTY HAS BEEN ADVISED
OF THE POSSIBILITY OF SUCH DAMAGES.  NO PARTY'S AGGREGATE LIABILITY TO THE OTHER
PARTY FOR DAMAGES  ARISING UNDER OR RELATING TO THIS AGREEMENT UNDER ANY AND ALL
CLAIMS  OF ANY TYPE OR  NATURE,  BASED ON ANY  THEORY  OF  LIABILITY  (INCLUDING
CONTRACT, TORT, NEGLIGENCE,  WARRANTY OR STRICT LIABILITY), SHALL EXCEED A TOTAL
OF $3,200,000.  This paragraph shall not limit a party's obligation to indemnify
the other  party in respect of third  party  claims  against the other party for
which indemnity is available under Sections 7.1(1) or (3) or 7.2(1) or (3).

         7.4 A party's  obligation  to indemnify the other is subject to (1) the
party seeking indemnity giving prompt (and in any event within thirty (30) days)
notice of any claim to the other party  following the  indemnified  party having
knowledge  of the matter in  question  (but the  failure to give such  notice in
respect of a third  party  claim  shall not affect the right of the  indemnified
party  to  indemnity  hereunder  unless  and to the  extent  that  such  failure
materially and adversely affected the defense of such claims by the indemnifying
party) and (2) the  indemnifying  party  having the right,  at its sole cost and
expense,  to assume and  control  the  defense of any such third party claim (in
which case the indemnified  party shall have the right, at no cost or expense to
the  indemnifying  party, to participate in such defense).  If the  indemnifying
party,  having  elected to assume such control,  thereafter  fails to defend the
third party claim  within a  reasonable  time,  the  indemnified  party shall be
entitled to assume such control and the indemnifying party shall be bound by the
results  obtained  by the  indemnified  party with  respect to such third  party
claim.  If the  indemnifying  party makes a payment,  by settlement of the third
party claim,  which precludes a final  determination  of the merits of the third
party claim and the indemnified  party and the indemnifying  party are unable to
agree whether such payment was unreasonable in the  circumstances  having regard
to the amount and merits of the third party claim,  then such  dispute  shall be
referred to and finally settled by binding arbitration from which there shall be
no appeal.  If the indemnifying  party fails to assume control of the defense of
any third party claim,  the indemnified  party shall have the exclusive right to
contest,  settle or pay the amount  claimed;  provided,  however,  that any such
actions shall not affect the indemnifying party's right to contest in good faith
its indemnity obligation with respect to such claim or the reasonableness of any
settlement thereof. Whether or not the indemnifying party assumes control of the
negotiation,  settlement or defense of any third party claim,  the  indemnifying
party shall not settle any third party claim without the written  consent of the
indemnified party, which consent shall not be unreasonably  withheld or delayed;
provided, however, that the liability of the indemnifying party shall be limited
to the  proposed  settlement  amount if any such consent is not obtained for any
reason  within  a  reasonable  time  after  the  request   therefor.   Following
indemnification  the indemnifying party shall be subrogated to all rights of the
indemnified  party with respect to all third parties  relating to the matter for
which  indemnification has been made. In the case of a claim that is not a third
party claim (a "Direct Claim"),  the indemnifying  party shall have 60 days from
receipt of notice of the claim  within which to make such  investigation  of the
claim as the  indemnifying  party  considers  necessary  or  desirable.  For the
purpose of such investigation, the indemnified party shall make available to the
indemnifying  party the  information  relied  upon by the  indemnified  party to
substantiate  the  claim,  together  with  all  such  other  information  as the
indemnifying  party may reasonably  request.  If both parties agree at or before
the  expiration  of such 60 day period (or any  mutually  agreed upon  extension
thereof) to the validity and amount of such claim, the indemnifying  party shall
immediately  pay to the  indemnified  party the full  agreed  upon amount of the
claim, failing which the matter shall be referred to binding arbitration in such
manner as the parties may agree or shall be  determined  by a court of competent
jurisdiction.

                         EMPLOYEES AND EMPLOYEE BENEFITS

         8.1 Offer of Employment.  Buyer has offered or will offer employment to
the  employees of Seller  listed on Schedule 8.1 (the  "Transferred  Employees")
contingent  on the  happening  of the Closing,  at not less than the  employee's
current  rate  of  salary.  The  Transferred   Employees  will  be  eligible  to
participate  in the same employee  benefit  plans as are generally  available to
similarly situated employees of Buyer.

         8.2  Assistance.  The Buyer shall not be  obligated to any employee who
refuses the Buyer's offer of employment.  The Seller shall render all reasonable
assistance to encourage each Employee to accept the Buyer's offer of employment.

         8.3  Severance.   Seller  shall  be  responsible   for  any  severance,
termination  and  all  other  similar  benefits  which  may be  due to  Seller's
employees. In addition,  Seller is responsible for any amounts owing to Seller's
employees that accrue prior to the Closing,  including accrued vacation, whether
or not that employee is a Transferred Employee.

         8.4  Information.   Former  Seller  employees  who  become  Transferred
Employees  are hereby  released by Seller  from any  confidence  obligations  to
Seller arising from their previous employee relationship with Seller which would
prevent  them  from  using  confidential  information  respecting  the  business
represented by the Purchased Assets for the benefit of Buyer.

                               GENERAL PROVISIONS

         9.1 Waiver.  No amendment or waiver of any provision of this  Agreement
shall in any event be effective,  unless the same shall be in writing and signed
by the parties  hereto,  and then such waiver or consent shall be effective only
in the specific instance and for the specific purpose for which given. No waiver
shall be inferred  from or implied by any failure to act or delay in acting by a
party in respect of any default, breach or non-observance or by anything done or
omitted to be done by the other party.

         9.2  Notices.  All  official  notices,   requests,  demands  and  other
communications  hereunder shall be in writing and shall be sent by registered or
certified mail, postage prepaid, return receipt requested, by personal delivery,
prepaid courier or fax with confirmation of receipt as follows:

                  (a)      If to Seller:
                           Semaphore Communications Corporation
                           800 Long Ridge Road
                           P.O. Box 1600
                           Stamford, Connecticut 06904
                           Attention: Chief Financial Officer

                           With a copy to:
                           Semaphore Communications Corporation
                           800 Long Ridge Road
                           P.O. Box 1600
                           Stamford, Connecticut 06904
                           Attention: General Counsel

                  (b)      If to Buyer:
                           Digital Link Corporation
                           217 Humboldt Court
                           Sunnyvale, California 94089-1300
                           Attention: Chief Financial Officer


Any party may change its address for receiving notice by written notice given to
the others named above.

Any such  communication  so given or made  shall be deemed to have been given or
made and to have been  received on the day of delivery if  delivered,  or on the
day of faxing or sending by other  means of recorded  electronic  communication,
provided  that such day in either event is a business day and the  communication
is so  delivered,  faxed or sent before 4:30 p.m. on such day.  Otherwise,  such
communication  shall be  deemed  to have  been  given  and made and to have been
received on the next following business day. Any such communication sent by mail
shall be  deemed to have been  given and made and to have been  received  on the
fifth business day following the mailing  thereof;  provided,  however,  that no
such communication  shall be mailed during any actual or apprehended  disruption
of postal  services.  Any such  communication  given or made in any other manner
shall be deemed to have been given or made and to have been  received  only upon
actual receipt.

         9.3 Expenses.  Each party to this Agreement shall pay its own costs and
expenses in connection with the entering into of this Agreement including legal,
accounting  and  investment  advisor fees.  Each party  acknowledges  and to and
agrees  with the other  that it has not  entered  into an  agreement  that would
result in a broker or finder fee  pertaining to the  Agreement  being payable by
the other party.

         9.4 Entire  Transaction.  This Agreement and the documents  referred to
herein  contain the entire  understanding  among the parties with respect to the
transactions  contemplated  hereby  and  supersedes  all  other  agreements  and
understandings  among the parties on the subject matter hereof.  The obligations
and  rights  of this  agreement  shall  inure to the  parties  hereto  and their
respective successors and assigns.

         9.5 Choice of Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of California.

         9.6 Publicity.  Immediately after the Closing the parties shall issue a
mutually  agreed  press  release.  The  parties  will not make any other  public
announcement  of this  transaction  without the other party's  written  consent,
except as may be required by applicable Federal securities or other law.

         9.7 Successors and Assigns.  This Agreement  shall enure to the benefit
of, and be binding on, the parties and their respective successors and permitted
assigns.  Neither party may assign or transfer,  whether  absolutely,  by way of
security or otherwise,  all or any part of its respective  rights or obligations
under this Agreement without the prior written consent of the other party.

         9.8  Counterparts.  This  Agreement  may be  executed  in any number of
counterparts,  each of which shall be deemed to be an original  and all of which
taken  together  shall be  deemed  to  constitute  one and the same  instrument.
Counterparts  may be  executed  either in original or faxed form and the parties
adopt any signatures  received by a receiving fax machine as original signatures
of the parties;  provided,  however,  that any party  providing its signature in
such manner shall promptly  forward to the other party an original of the signed
copy of this Agreement which was so faxed.

         IN WITNESS WHEREOF, each of the parties has caused this Agreement to be
executed on its behalf by a duly authorized officer all as of the Closing Date.

DIGITAL LINK CORPORATION                      SEMAPHORE COMMUNICATIONS
                                              CORPORATION


     /s/ Stanley E. Kazmierczak                    /s/ Timothy da Silva
By:   _________________________               By:  _________________________
      Chief Financial Officer                      President & CEO
Its: __________________________               Its: _________________________

<PAGE>

The following schedules were omitted from this filing:

Schedule 1.3A -- Assumed Contracts
Schedule 1.1A -- Seller Intellectual Property
Schedule 1.1C -- Inventory on Hand by Stock Room
Schedule 1.1D -- Property, Plant & Equipment Schedule
Schedule 1.1I -- Accounts Receivable Aging Report
Schedule 1.1J -- Prepaid Assets
Schedule 1.3B -- Deferred Revenue
Schedule 1.3D -- Open Purchase Orders from Customers
Schedule 2.2  -- Purchase Order Commitment Report
Schedule 2.5  -- Purchase Price Allocation
Schedule 8.1  -- Transferred Employees



                                                                  Exhibit 4.01 
                                                                                
                          REGISTRATION RIGHTS AGREEMENT


         This  Registration  Rights  Agreement,  dated as of April 3,  1998 (the
"Agreement"),  is made and entered into by and between Digital Link Corporation,
a  California   corporation   (the   "Company")  and  Semaphore   Communications
Corporation, a Delaware corporation ("Semaphore").

         WHEREAS,  Semaphore  has  been  issued  291,182  shares  of  the  
Company's outstanding Common Stock;

         NOW, THEREFORE,  in consideration of the mutual promises and agreements
hereinafter  set forth,  and for other valuable  consideration,  the Company and
Semaphore agree as follows:

         1. Definitions. The Company's Common Stock, no par value, and any other
securities of the Company  convertible  into or  exchangeable  for the Company's
Common Stock are  hereinafter  referred to as the "Common Stock" and the 291,182
shares of Common Stock  beneficially  owned by the  Stockholders are hereinafter
referred to as the "Shares." The term  "Registrable  Securities"  means: (i) the
Shares;  and (ii) any  shares of  Company  Common  Stock that may be issued as a
dividend  or other  distribution  (including  without  limitation  shares of the
Company's  Common  Stock  issued in a  subdivision  and  split of the  Company's
outstanding Common Stock) with respect to, or in exchange for, or in replacement
of,  shares of the  Company's  Common Stock  described in clause (i) above or in
this clause  (ii);  excluding  in all cases,  however,  from the  definition  of
"Registrable Securities" any such shares that are: (w) registered under the 1933
Act other than  pursuant  to a  registration  statement  filed  pursuant to this
Agreement;  (x) sold by a person in a  transaction  in which  rights  under this
Agreement  with respect to such shares are not assigned in  accordance  with the
terms of this  Agreement;  (y) sold pursuant to a registration  statement  filed
pursuant to this Agreement;  or (z) sold pursuant to Rule 144 promulgated  under
the 1933 Act or otherwise  sold to the public.  For purposes of this  Agreement,
the terms  "beneficial  ownership,"  "person"  and  "affiliate,"  shall have the
meanings  ascribed to such terms in Rules  12b-2 and 13d-3 under the  Securities
Exchange Act of 1934 (the "1934 Act").  Each of the terms  "Securities  Act" and
"1933 Act" means the  Securities  Act of 1933, as amended.  The term "SEC" means
the Securities and Exchange Commission. Capitalized terms used but not otherwise
defined  herein shall have the meaning given to them in the Asset Sale Agreement
of even date herewith. As used herein, the term "Stockholder" and "Stockholders"
shall mean  Semaphore  or any  assignee  of record of the Shares to whom  rights
under this Agreement  have been duly assigned in accordance  with the provisions
of this Agreement.

         2. Assignment of Registration  Rights.  The rights to cause the Company
to  register  Common  Stock  pursuant  to Section 4 below may be assigned by the
Stockholder only with the Company's express prior written consent,  which may be
withheld in the Company's sole discretion; provided, however, that the rights of
a Stockholder under this Agreement may be assigned without the Company's express
prior written consent:  (a) to a Permitted  Assignee (as defined below);  or (b)
(if  applicable) by will or by the laws of intestacy,  descent or  distribution,
provided that the assignee  agrees in writing to be bound by all the obligations
of the Stockholder under this Agreement. Any attempt to assign any rights of the
Stockholder  under this  Agreement  without the Company's  express prior written
consent in a situation in which such  consent is required by this Section  shall
be null and void and without effect. Subject to the foregoing restrictions,  all
rights,  covenants  and  agreements  in this  Agreement  by or on  behalf of the
parties  hereto will bind and inure to the benefit of the  respective  permitted
successors and assigns of the parties hereto.  Each of the following parties are
"Permitted  Assignees"  for  purposes  of this  Section  2:  (a) a  trust  whose
beneficiaries  consist solely of a Stockholder and such Stockholder's  immediate
family; (b) the personal  representative (such as an executor of a Stockholder's
will),  custodian or  conservator  of a  Stockholder,  in the case of the death,
bankruptcy or adjudication of incompetency of that Stockholder;  (c) partners of
a Stockholder that is a partnership,  if Registrable  Securities are distributed
pro rata, without additional consideration, to the partners; (d) stockholders of
a  Stockholder  that  is  a  corporation,  if  the  Registrable  Securities  are
distributed  to  such  stockholders;  or  (d)  immediate  family  members  of  a
Stockholder.

         3.  Termination  of Section  4. The  Company  will have no  obligations
pursuant to Section 4 of this  Agreement with respect to any Notice of Resale or
other request or requests for registration (or inclusion in a registration) made
by any Stockholder or to maintain or continue to keep effective any registration
or  registration   statement  pursuant  hereto:  (a)  after  the  expiration  or
termination of the Registration Period; (b) with respect to Section 4.3 only, if
the Company has already  effected three (3) Permitted  Windows  pursuant to this
Agreement;  (c) with respect to a particular  Stockholder  if, in the opinion of
counsel to the Company,  all such Registrable  Securities proposed to be sold by
such  Stockholder  may be sold in a three (3) month period without  registration
under  the  1933 Act  pursuant  to Rule 144  promulgated  under  the 1933 Act or
otherwise;  or (d) if all  Registrable  Securities have been registered and sold
pursuant to a registration  effected pursuant to this Agreement and/or have been
transferred in transactions in which registration rights hereunder have not been
assigned in accordance with this Agreement.

         4.       Registration Rights.

                  4.1.1 In the event that the Company  proposes to register  any
shares of Common Stock under the 1933 Act (other than for an offering  primarily
or exclusively to employees or in connection  with the acquisition of the assets
or shares  of,  or merger or  consolidation  with,  another  corporation)  and a
registration  form  is  available  for  use  which  may  also  be  used  for the
registration of the Shares held by the Stockholder (a "Piggyback Registration"),
the Company shall notify the Stockholder at least 15 days prior to the filing of
any  such  registration  form  with the SEC,  and will use its best  efforts  to
include in such  registration  all such Shares with respect to which the Company
has received  written  request for  inclusion  within 10 days after such notice.
Each such request shall specify the number of shares such Stockholder  wishes to
include in such registration statement and shall contain an undertaking from the
Stockholder  to provide all such  information  and material and to take all such
actions as may be  required  by the  Company  in order to permit the  Company to
comply with all applicable federal and state securities laws.

                  4.1.2  The  Stockholder  shall pay all  sales  commissions  or
similar selling charges with respect to Shares sold by the Stockholder  pursuant
to a Piggyback  Registration.  The Company shall pay all registration and filing
fees,  fees and expenses of compliance with federal and state  securities  laws,
printing  expenses,  messenger and delivery  expenses,  accounting  fees and the
reasonable fees and disbursements of counsel for the Company and one counsel for
the Stockholders in connection with a Piggyback Registration.

                  4.1.3  If a  Piggyback  Registration  is for  an  underwritten
offering,  then the  Company  shall so advise the  Stockholders  of  Registrable
Securities.  In such  event,  the  right of any such  Stockholder's  Registrable
Securities to be included in a registration pursuant to this Section 4.1.1 shall
be conditioned upon such  Stockholder's  participation in such  underwriting and
the inclusion of such Stockholder's  Registrable  Securities in the underwriting
to the extent provided herein.  All  Stockholders  proposing to distribute their
Registrable   Securities   through  such   underwriting   shall  enter  into  an
underwriting  agreement  in  customary  form with the  managing  underwriter  or
underwriter(s)  selected  for  such  underwriting.   Notwithstanding  any  other
provision of this Agreement,  if the managing underwriters advise the Company in
writing that in their  opinion the number of shares  requested to be included in
such Registration  exceeds the number which can be sold in such offering or will
have a material adverse effect on the price of the Common Stock to be sold, then
the Company will include in such Registration (a) first,  shares of Common Stock
the Company proposes to sell and (b) second, shares that the Stockholder and any
other stockholders which have registration rights have requested to be included,
pursuant to the terms of their applicable  registration  rights agreement,  on a
pro rata basis based on the total number of registrable  securities then held by
each such stockholder.  If any Stockholder  disapproves of the terms of any such
underwriting, such Stockholder may elect to withdraw therefrom by written notice
to the Company and the  underwriter,  delivered at least ten (10)  business days
prior to the  effective  date of the  registration  statement.  Any  Registrable
Securities  excluded or withdrawn from such  underwriting  shall be excluded and
withdrawn from the  registration.  For any Stockholder which is a partnership or
corporation,   the  partners,   retired   partners  and   shareholders  of  such
Stockholder,  or the estates and family members of any such partners and retired
partners and any trusts for the benefit of any of the foregoing persons shall be
deemed to be a single  "Stockholder," and any pro rata reduction with respect to
such  "Stockholder"  shall be based upon the aggregate amount of shares carrying
registration  rights  owned by all  entities  and  individuals  included in such
"Stockholder," as defined in this sentence.

         4.2 Reporting.  With a view to making available to the Stockholders the
benefits of certain rules and  regulations  of the SEC which may permit the sale
of the Registrable Securities to the public on Form S-3 or without registration,
after such time as a public  market  exists for the Common Stock of the Company,
the Company agrees to use its best efforts to:

                  4.2.1 At all times make and keep public information available,
as those terms are  understood  and defined in SEC Rule 144 under the Securities
Act and Item I.A.3 of Form S-3 or any similar or analogous rule or form;

                  4.2.2 File with the SEC, in a timely  manner,  all reports and
other  documents  required of the Company under the Securities Act and 1934 Act;
and

                  4.2.3  So  long  as  the   Stockholders  own  any  Registrable
Securities,  furnish to the  Stockholders  forthwith  upon  written  request:  a
written  statement  by the  Company  as to its  compliance  with  the  reporting
requirements  of said Rule 144 of the Securities Act and of the 1934 Act; a copy
of the most recent  annual or quarterly  report of the  Company;  and such other
reports and  documents as the  Stockholder  may  reasonably  request in availing
itself  of any  rule or  regulation  of the SEC  allowing  it to sell  any  such
securities without registration.

The  Company  agrees  that  upon  receiving  notice  from a  Stockholder  of its
intention  to avail  itself of benefits of Rule 144 or any similar or  analogous
rule, or of Section 4.3 below,  the Company will as soon as  practicable  comply
with the information and reporting  requirements of this Section 4.2 if, despite
the Company's best efforts to effect ongoing  compliance,  there shall have been
any failure or lapse in fulfilling the reporting and information requirements of
this Section.

         4.3      Form S-3 Registration.

                  4.3.1    Registration and Notice.

                  (a) Filing and Registration  Period. In case the Company shall
receive  from the  Stockholder  a  written  request  that the  Company  effect a
registration  on Form  S-3 and any  related  qualification  or  compliance  with
respect  to  all or a part  of the  Registrable  Securities,  then  as  soon  as
practicable thereafter,  and consistent with the requirements of applicable law,
the Company shall prepare and file with the SEC a registration statement on Form
S-3 for an  offering  to be made on a  continuous  basis  pursuant  to Rule  415
covering  all  of  the  then  outstanding  Registrable  Securities  (the  "Shelf
Registration").  The Company shall use its reasonable good faith efforts to have
such Shelf  Registration  declared  effective as soon as  practicable  after its
filing and to keep the Shelf Registration  continuously effective under the 1933
Act for a  continuous  period of time  (such  period of time  being  hereinafter
called the "Registration  Period") commencing on the date the Shelf Registration
is   declared   effective   under  the  1933  Act  by  the  SEC  (the  "Date  of
Effectiveness")  and ending on the date that is the first (1st)  anniversary  of
the Closing  (subject to Section  4.3.2(b)).  The Company  shall have no duty or
obligation to keep the Shelf  Registration (or any Subsequent  Registration,  as
defined  below)  effective  after the  expiration  of the  Registration  Period.
Accordingly,  the Stockholders  acknowledge that the Registrable Securities will
not be registered under the 1933 Act beginning one (1) year after the Closing.

                  (b)  Subsequent  Registration.  If the Shelf  Registration  is
filed  with the SEC and  becomes  effective  under the 1933  Act,  and the Shelf
Registration or a Subsequent  Registration (as defined below)  thereafter ceases
to be effective for any reason at any time during the Registration  Period, then
the Company  shall use its best efforts to obtain the prompt  withdrawal  of any
order  suspending  the  effectiveness  thereof,  and in any event shall,  within
thirty (30) days of such  cessation of  effectiveness,  file an amendment to the
Shelf Registration  seeking to obtain the withdrawal of the order suspending the
effectiveness  thereof,  or file an additional  "shelf"  registration  statement
pursuant to Rule 415 covering all of the then outstanding Registrable Securities
(a  "Subsequent  Registration").  If a  Subsequent  Registration  is filed,  the
Company shall use its best efforts to cause the  Subsequent  Registration  to be
declared  effective  as soon as  practicable  after such filing and to keep such
registration  statement continuously effective until the end of the Registration
Period.

                  (c) Supplements  and Amendments.  Subject to the provisions of
Section  4.3.1(g),  during the Registration  Period the Company shall supplement
and amend the Shelf  Registration  if, as and when required by the 1933 Act, the
rules and  regulations  promulgated  thereunder  or the  rules,  regulations  or
instructions  applicable to the  registration  form used by the Company for such
Shelf Registration.

                  (d)  Timing  and  Manner  of  Sales.  Any sale of  Registrable
Securities  pursuant to a Shelf Registration or a Subsequent  Registration under
this  Section  4.3 may be made only during a  "Permitted  Window" (as defined in
Section  4.3.1(g)  below).  In  addition,  any  sale of  Registrable  Securities
pursuant to a Shelf Registration or a Subsequent Registration under this Section
4.3 may only be made in accordance with the method or methods of distribution of
such Registrable Securities that are described in the registration statement for
the Shelf Registration (or Subsequent Registration, as applicable) and permitted
by such form of registration  statement,  which methods of distribution  will be
specified by the  Stockholders in their Notice of Resale (as defined  below).  A
Stockholder may also sell Registrable Securities in a bona fide private offering
if the  selling  Stockholder  provides  the  Company  with a written  opinion of
counsel,  reasonably satisfactory to counsel to the Company, that such offer and
sale is an exempt transaction under the 1933 Act and applicable state securities
laws,  complies with all requirements for such exemption(s) and is not made with
use of the prospectus for the Shelf Registration (or Subsequent Registration, if
applicable).  Each  Stockholder  agrees  that it will not  sell any  Registrable
Securities in any manner that would breach or violate any agreement between such
Stockholder and any third party.

                  (e) Trading  Limits;  No  Underwritings.  During any  calendar
quarter during the Registration Period, the Stockholders,  collectively, may not
sell an amount of Registrable  Securities  that, in the  aggregate,  exceeds two
percent (2%) of the outstanding  shares of Company Common Stock (as indicated in
the Company's then most recent  published  report)  without the Company's  prior
written consent. No sale of Registrable  Securities under any Shelf Registration
(or  Subsequent  Registration)  effected  pursuant  to this  Section  4.3 may be
effected  pursuant to any  underwritten  offering  without the  Company's  prior
written consent, which may be withheld in its sole and absolute discretion.

                  (f) Notice of  Resale.  Before  any  Stockholder  may make any
sale,  transfer or other  disposition of any  Registrable  Securities  under the
Shelf  Registration  (or a  Subsequent  Registration)  during  the  Registration
Period,  a Stockholder or Stockholders  who own at least twenty percent (20%) of
the then  outstanding  Registrable  Securities must first give written notice to
the  Company (a "Notice  of  Resale")  of such  Stockholder's  or  Stockholders'
present  intention to so sell,  transfer or otherwise  dispose of some or all of
such Stockholder's or Stockholders'  Registrable  Securities,  and the number of
Registrable  Securities  such  Stockholder  proposes  to so  sell,  transfer  or
otherwise  dispose  of.  In  addition,  a Notice  of Resale  shall  contain  the
information  required to be included  therein under Section 4.3.1(d) and Section
4.3.1(g).

                  (g)      Permitted Window; Sale Procedures.

                           (i) A "Permitted  Window" is a period of thirty (30) 
consecutive  calendar days commencing upon the Company's written notification to
the Stockholders in response to a Notice of Resale that the prospectus contained
in the Form S-3  registration  statement filed pursuant to Section 4.3.1 of this
Agreement is available to be used for resales of Registrable Securities pursuant
to the Shelf Registration (or a Subsequent Registration, as applicable).

                           (ii) Before a Stockholder can make a sale of any 
Registrable Securities,  and in order to cause a Permitted Window to commence, a
Stockholder or Stockholders who own(s) at least twenty percent (20%) of the then
outstanding  Registrable  Securities  must  first  give the  Company a Notice of
Resale indicating such Stockholder's or Stockholders' intention to sell at least
five percent (5%) of the then outstanding Registrable Securities pursuant to the
Shelf Registration (or Subsequent Registration, as applicable).

                           (iii) Upon receipt of such Notice of Resale (unless a
certificate  of the President or the Chief  Financial  Officer of the Company is
delivered as provided in Section 4.3.2(b) below),  the Company will give written
notice to all  Stockholders  as soon as  practicable,  but in no event more than
seven (7)  business  days after the  Company's  receipt of such Notice of Resale
that either: (A) the prospectus contained in the registration  statement for the
Shelf  Registration (or Subsequent  Registration,  if applicable) is current (it
being  acknowledged  that it may be necessary for the Company during this period
to supplement the prospectus or make an appropriate filing under the 1934 Act so
as to cause the prospectus to become  current) and that (as  applicable) (1) the
Permitted  Window will commence on the date of such notice by the Company or (2)
the Company is required  under the 1933 Act and the  regulations  thereunder  to
amend the  registration  statement  for the Shelf  Registration  (or  Subsequent
Registration,  as applicable) in order to cause the prospectus to be current. In
the event that the Company  determines  that an  amendment  to the  registration
statement is necessary as provided  above, it will file and cause such amendment
to  become  effective  as soon as  practicable;  whereupon  it will  notify  the
Stockholders that the Permitted Window will then commence.
                           
                           (iv) There  will be no more than three (3)  Permitted
Windows  during  the  Registration  Period  and there  will be at least a 30-day
interval between any two (2) Permitted  Windows.  Company shall not be obligated
to keep the registration statement for the Shelf Registration (or any Subsequent
Registration)  current  during any period  other than a  Permitted  Window.  If,
pursuant to Section  4.3.2(b),  the Company defers a Permitted  Window,  and the
Stockholders  withdraw their Notice of Resale,  then such  withdrawal  shall not
count as a Permitted  Window.  The  Stockholders may elect to withdraw a request
for  registration  pursuant to a Notice of Resale and such withdrawal  shall not
count as a Permitted Window; provided however, that if the Company has commenced
preparation of any supplement or amendment to the registration  statement or any
part  thereof in response to such Notice of Resale  prior to  receiving  written
notice  from  the   Stockholders'   of  the  withdrawal  of  their  request  for
registration,  then the Stockholders who originally gave the Company such Notice
of Resale will  promptly  reimburse  Company for its actual  costs and  expenses
reasonably incurred in preparing and/or filing such supplement and/or amendment.

                  (h) Trading Window  Compliance.  The Stockholders  acknowledge
that the Company maintains an Insider Trading  Compliance Program and an Insider
Trading Policy,  as such may be amended (the "Company  Trading Policy") and that
the Company Trading Policy requires that those  directors,  officers,  employees
and other  persons  whom the  Company  determines  to be "Access  Personnel"  or
otherwise subject to the "trading window" and pre-clearance  requirements of the
Company Trading Policy (and members of their immediate  families and households)
are  permitted  to effect  trades in Company  securities:  (i) only during those
specified time periods  ("trading  windows") in which such persons are permitted
to make sales,  purchases or other trades in the Company's  securities under the
"trading window"  provisions of the Company Trading Policy;  and (ii) only after
pre-clearance  of such  sales,  purchases  or other  trades  with the  Company's
Insider Trading  Compliance  Officer.  If a Stockholder is or becomes subject to
the "trading  window" and/or  "pre-clearance"  provisions of the Company Trading
Policy described above, then,  notwithstanding  anything herein to the contrary,
such Stockholder may sell,  transfer and dispose of Registrable  Securities only
during those  trading  windows  during which such Company  Access  Personnel are
permitted to effect trades in Company stock under the Company Trading Policy and
only  after   pre-clearing  such  trades  with  the  Company's  Insider  Trading
Compliance Officer as provided in the Company Trading Policy. Semaphore is not a
stockholder to which the Company Trading Policy applies.

                  4.3.2 Registration.  Notwithstanding the provisions of Section
4.3.1 above, the Company shall not be obligated to effect any such registration,
qualification  or compliance  pursuant to this Section 4.3, and the  Stockholder
shall not be entitled to sell the Shares pursuant to any registration  statement
filed under Section 4.3 of this Agreement, as applicable:

                  (a)     if Form S-3 is not then available for such offering 
by the Stockholder;

                  (b)  if  the  Company  shall  furnish  to  the  Stockholder  a
certificate  signed by the President or Chief  Executive  Officer of the Company
stating  that in the  good  faith  judgment  of the  Board of  Directors  of the
Company,  it would be seriously  detrimental to the Company and its stockholders
for such  Permitted  Window  to be in effect at such  time,  in which  event the
Company  shall  have the right to defer a  Permitted  Window for a period of not
more  than  sixty  (60)  days  after  receipt  of a Notice  of  Resale  from the
Stockholder or Stockholders  pursuant to Section  4.3.1(f);  provided,  however,
that the Company may so  postpone a Permitted  Window no more than twice  during
the Registration Period; and provided further,  that if the Company so postpones
a Permitted Window, then  notwithstanding the last sentence of Section 4.3.1(a),
the Registration  Period of the Shelf Registration shall be extended by a period
of time equal to the period of  postponement  plus, if a Permitted  Window is in
effect at the end of such extended  Registration Period, the Registration Period
of the Shelf Registration shall be further extended until the expiration of such
thirty day Permitted  Window  (subject to the  provisions of Section 3 above and
Section 4.3.3 below);  and provided further,  that if Company defers a Permitted
Window as provided herein and the Stockholders  withdraw their Notice of Resale,
then such withdrawal shall not count as a Permitted Window;

                  (c)     if the Company is acquired and its Common Stock 
ceases to be publicly traded;

                  (d) in any particular  jurisdiction in which the Company would
be required to qualify to do business or to execute a general consent to service
of process in effecting such registration, qualification or compliance.

                  (e) if the SEC refuses to declare such registration  effective
due to the  participation  of any particular  Stockholder  in such  registration
(unless such Stockholder withdraws all such Stockholder's Registrable Securities
from such registration statement).

                  4.3.3 Shares  Otherwise  Eligible for Resale.  Notwithstanding
anything herein to the contrary, the Company shall not be obligated to effect or
continue  to keep  effective  any  such  registration,  registration  statement,
qualification  or compliance with respect to the Registrable  Securities held by
any particular Stockholder:

                  (a) if the Company or its legal  counsel shall have received a
"no-action"  letter or similar  written  confirmation  from the SEC that all the
Registrable  Securities  then  held by such  Stockholder  may be  resold by such
Stockholder within a three (3) month period without  registration under the 1933
Act pursuant to the  provisions of Rule 144  promulgated  under the 1933 Act (or
successor provisions), or otherwise;

                  (b) if legal  counsel to the Company  shall  deliver a written
opinion to the Company,  its transfer  agent and the  Stockholders,  in form and
substance  reasonably  acceptable  to the  Company and the  Stockholder,  to the
effect that all the Registrable  Securities then held by such Stockholder may be
resold by such Stockholder within a three (3) month period without  registration
under the 1933 Act pursuant to the provisions of Rule 144 promulgated  under the
1933 Act, or otherwise; or

                  (c)  after  expiration  or  termination  of  the  Registration
Period.

                  4.3.4 Expenses. The Company shall pay all expenses incurred in
connection  with each  registration  requested  pursuant  to this  Section  4.3,
(excluding  underwriters'  or brokers'  discounts  and  commissions),  including
without  limitation all filing,  registration and  qualification,  printers' and
accounting  fees and the reasonable  fees and  disbursements  of counsel for the
Company and one counsel for the Stockholders.

         4.4  Furnish  Information.  It shall be a  condition  precedent  to the
obligations  of the Company to take any action  pursuant to this  Agreement that
the selling Stockholders will furnish to the Company such information  regarding
themselves,  the Registrable Securities held by them, and the intended method of
disposition and plan of distribution of such Registrable  Securities as shall be
required to timely effect the registration of their Registrable Securities.

         5. Injunctive and Other Relief.  The Company and the Stockholder  agree
that in the event that either party breaches this Agreement,  the  non-breaching
party will be irreparably  harmed and will be entitled to injunctive  relief and
specific enforcement in addition to any other remedy which it may have at law or
in equity.  No  Stockholder  will have any right to obtain or seek an injunction
restraining or otherwise  delaying any registration  that is the subject of this
Agreement as the result of any controversy  that might arise with respect to the
interpretation or implementation of this Agreement.

         6. Entire Agreement; Modification. This Agreement sets forth the entire
agreement  and  understanding  between  the parties  hereto with  respect to the
subject matter hereof,  and merges and supersedes any and all prior discussions,
agreements,  and understandings  between or among them with respect thereto, and
no  party   shall  be  bound  by  any   condition,   definition,   warranty   or
representation,  other than those  expressly  set forth or provided  for in this
Agreement or in any document or instrument delivered pursuant to this Agreement,
or as may be set forth in writing and signed by the party or parties to be bound
thereby on or subsequent to the date hereof.  This  Agreement may not be changed
or modified,  except by an agreement in writing  executed by the Company and the
Stockholder.

         7. Governing  Law. This  Agreement  shall be governed by California law
(excluding the choice of law provisions) and applicable Federal law.

         8.  Severability.  If any  term,  provision,  covenant  or  restriction
contained in this Agreement is held by a court of competent  jurisdiction  to be
invalid,  void, or  unenforceable,  then the remainder of this  Agreement  shall
remain  operative and in full force and effect.  If any  provision  contained in
this Agreement is invalidated or becomes inoperative because of a change in law,
the  parties  hereto  will use  their  best  efforts  to  adopt  an  appropriate
substitute  (if any) for  such  provision  consistent  with  the  intent  of the
parties.

         9. Binding Effect of Agreement.  The terms of this  Agreement  shall be
binding on and inure to the benefit of the parties  hereto and their  respective
subsidiaries,  parents or other affiliated entities,  agents, attorneys,  heirs,
executors, successors, representatives and assigns.

         10. Notices.  All notices,  requests,  demands and other communications
hereunder  shall be in  writing  and shall be deemed to have been duly  given if
delivered  by (i) hand,  (ii)  certified  or  registered  mail,  return  receipt
requested,  (iii) facsimile (with confirmation  receipt) or (iv) prepaid courier
service,  to the  following  addresses:  (a) if to the  Company to 217  Humboldt
Court, Sunnyvale, CA 94089, Attention: Chief Financial Officer and (b) if to the
Stockholder, to Semaphore Communications Corporation,  800 Long Ridge Road, P.O.
Box 1600, Stamford,  Connecticut 06904, Attention: Chief Financial Officer, with
a copy to Semaphore  Communications  Corporation,  800 Long Ridge Road, P.O. Box
1600, Stamford, Connecticut,  Attention: General Counsel or to such other person
or persons or to such other  address or addresses as may be designated by one to
the other.

         11. Counterparts.  This Agreement may be executed in counterparts, each
of which will be deemed an original,  but all of which together will  constitute
one and the same instrument.

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

DIGITAL LINK CORPORATlON


By: /s/ Stanley E. Kazmierczak, CFO



SEMAPHORE COMMUNICATIONS CORPORATION


By: /s/ Timothy da Silva, President & CEO



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