Exhibit  10.20
                   SECURED PROMISSORY NOTE
                    Sunnyvale, California

$250,000.00                                    September 30, 1996

    1.     Obligation.    The  undersigned,   Alan   I.
Fraser ("Borrower") hereby promises to pay to the order of
Digital Link Corporation, a California corporation,
("Lender" or "Holder")  on or  before
September 30, 1999, at Lender's  principal  place  of
business at 217 Humboldt Court, Sunnyvale, California
94089,  or at  such other place as Holder may direct, the
principal  sum  of Two  Hundred Fifty Thousand Dollars
($250,000.00), together  with all  interest accrued on
unpaid principal, at a rate of  six  and two  one
hundredths percent (6.02%) per annum (calculated on  the
basis of a 360day year), compounded annually, which rate
is  not less than   the  minimum  rate established
pursuant  to Section 1274(d) of the Internal Revenue Code of 1986, 
as amended, as  of the  date  hereof.   As
used herein,  the  term  "Holder"  shall
initially mean Lender, and shall subsequently mean each
person or entity to whom this Note is duly assigned.

If  any  payment of principal or interest under this Note
becomes due  and  payable  on a day other than a business
day  then  the maturity  of such payment will be extended
to the next succeeding business  day,  and  with respect
to the payment  of  principal, interest  thereon  will be
payable at the rate set  forth  herein during the period
of such extension.

   2.    Prepayment.   Prepayment of  unpaid  principal
and/or interest  due  under this Note may be made at  any  time
without penalty.      Unless  otherwise agreed in  writing
by  Holder,  all payments  will be made in lawful tender of the United
States and will  be  applied (a) first, to the payment of
accrued interest, and (b) second, (to the extent that the
amount of such prepayment exceeds  the amount of all such
accrued interest), to the payment of principal.

   3.    Security.   Payment  of this  Note  is  secured
by  a security  interest in assets and properties of  Borrower
granted pursuant  to  the  terms and conditions of a
Security  Agreement dated  of even date herewith among
Borrower and Lender,  as  such may be amended from time to
time (the "Security Agreement").

   4.    Default; Acceleration of Obligation.  Borrower
will be deemed  to  be  in  default under this Note and  the
outstanding unpaid principal balance of this Note, together with all
interest accrued thereon, will immediately become due and
payable in full, without  the need for any further action
on the part  of  Holder, upon  the  occurrence  of any of
the following  events  (each  an "Event  of
Default"):  (a) upon Borrower's failure to  make  any
payment when due under this Note; (b) upon any sale,
transfer  or other  disposition of the Collateral by
Borrower;  (c)  upon  the filing  by   or
against Borrower of any voluntary or  involuntary
petition  in  bankruptcy or any petition  for  relief
under the federal bankruptcy code or any other state or
federal law for the relief  of debtors;  provided,  however,  with  
respect  to an involuntary  petition in bankruptcy, such petition has
not been dismissed  within  thirty  (30) days after  the
filing of  such petition; (d) upon the execution by
Borrower of an assignment for the  benefit  of  creditors
or the appointment  of  a  receiver, custodian,
trustee  or  similar  party  to  take  possession  of
Borrower's assets or property; or (e) upon any breach,
default or violation   by  Borrower  of  any  term,  condition,
obligation, representation or covenant of the Security Agreement.

    5.    Remedies On Default; Acceleration.  Upon any
Event  of Default, Holder will have, in addition to its rights and
remedies under  this  Note,  full  recourse against  any
real,  personal, tangible  or  intangible assets of
Borrower, and may  pursue  any legal or equitable remedies
that are available to Holder, and may declare  the entire
unpaid principal amount of this Note and  all unpaid
accrued interest under this Note to be immediately due and
payable in full.

     6.    Waiver and Amendment.  Any provision of this
Note may be  amended or modified only by a writing signed by both
Borrower and Holder.  Except as provided below with
respect to waivers  by Borrower, no waiver or consent with
respect to this Note will  be binding or effective unless
it is set forth in writing and signed by  the party
against whom such waiver is asserted.  No course of
dealing  between Borrower and Holder will operate as a
waiver  or modification  of any  party's rights or
obligations  under  this Note.   No delay  or  failure on
the part  of  either  party  in exercising any right or
remedy under this Note will operate as  a waiver  of such
right or any other right.  A waiver given on  one occasion
will not be construed as a bar to, or as a  waiver  of,
any right or remedy on any future occasion.

    7.     Waivers   of   Borrower.   Borrower   hereby
waives presentment, notice of non-payment, notice of dishonor,
protest, demand and diligence.  This Note may be amended
only by a writing executed by Borrower and Holder.

     8.    Governing  Law.   This Note will be  governed
by and construed  in accordance with the internal laws of the
State  of California as applied to agreements between
residents thereof  to be  performed  entirely within such
State, without  reference  to that body of law relating to
conflict of laws or choice of law.

     9.      Severability;   Headings.    The
invalidity    or unenforceability of any term or
provision of this Note  will not affect  the  validity
or enforceability of  any  other term  or provision
hereof.  The headings in this Note are
for convenience of  reference  only  and will not alter
or otherwise  affect  the meaning of this Note.

     10.   Jurisdiction; Venue.  Borrower, by  its
execution  of this  Note,  hereby  irrevocably   submits  to  the  in
personam jurisdiction  of the state courts of the State of
California  and of  the United States District Court for the
Northern District of California  that  are located in Santa
Clara County,  California, for  the  purpose of any suit,
action or other proceeding arising out of or based upon this
Note.

     11.  Attorneys' Fees.  If suit is brought for collection
of this  Note  or  enforcement of the Security Agreement,
Borrower agrees to pay all reasonable expenses, including
attorneys' fees, incurred  by Holder in connection therewith
whether or  not  such suit is prosecuted to judgment.

     12.   Assignment.   This  Note is  freely  transferable
and assignable  by  Holder, provided that such transfer  is made
in compliance with all applicable state and federal securities
laws. Any  reference to Holder herein will be deemed to  refer
to  any subsequent  transferee  of  this Note  at  such  time
as   such transferee  holds this Note. This Note may not be
assigned  or delegated  by  Borrower,
whether  by  voluntary  assignment
or transfer, operation of law, merger or otherwise.

     IN  WITNESS WHEREOF, Borrower has executed this Note
as  of the date and year first above written.

                              BORROWER
                          \s\ Alan I. Fraser
                          Alan I. Fraser