EXHIBIT 10.66

                                 PROMISSORY NOTE

$40,000                                                          August 21, 2000
                                                             Fremont, California

         For Value Received,  Daryl Mossman ("Borrower") hereby  unconditionally
promises  to pay to the  order of SSE  Telecom,  Inc.,  a  Delaware  corporation
("Lender"),  in lawful money of the United States of America and in  immediately
available  funds,  the principal sum of Forty  Thousand  Dollars  ($40,000) (the
"Loan").

         1.       Principal Repayment.  The outstanding  principal amount of the
                  Loan  shall  be fully  due and  payable  on  August  21,  2002
                  ("Maturity Date")

         2.       Accelerated Principal Repayment.

                  (a)      Borrower may prepay the outstanding  principal amount
                           of the  Loan at any time  before  the  Maturity  Date
                           without penalty.

                  (b)      In the event Borrower's relationship with the Lender,
                           whether  as  an  employee,  director  or  consultant,
                           terminates for any reason prior to payment in full of
                           this Note the outstanding  principal shall accelerate
                           in full and such  outstanding  principal shall become
                           immediately  due and  payable  as of the  date of the
                           termination of such relationship.

         3.       Place Of  Payment.  All  amounts  payable  hereunder  shall be
                  payable  at the office of Lender,  47823  Westinghouse  Drive,
                  Fremont,  CA 94539,  unless  another place of payment shall be
                  specified in writing by Lender.

         4.       Default.  Each of the  following  events shall be an "Event of
                  Default" hereunder:

                  (a)      Borrower  fails to pay  timely  any of the  principal
                           amount  due  under  this  Note on the  date  the same
                           becomes due and  payable or within five (5)  business
                           days thereafter;

                  (b)      Borrower files any petition or action of relief under
                           any   bankruptcy,   reorganization,   insolvency   or
                           moratorium law or any other law for the relief of, or
                           relating to, debtors,  now or hereafter in effect, or
                           makes any  assignment for the benefit of creditors or
                           takes any corporate  action in  furtherance of any of
                           the foregoing; or

                  (c)      An  involuntary  petition is filed  against  Borrower
                           (unless  such  petition is  dismissed  or  discharged
                           within twenty (20) days) under any bankruptcy statute
                           now or hereafter in effect, or a custodian, receiver,
                           trustee,  assignee for the benefit of  creditors  (or
                           other   similar   official)   is  appointed  to  take
                           possession,  custody of control  of any  property  of
                           Borrower.

                  Upon the  occurrence  of an Event of  Default  hereunder,  all
                  unpaid principal and other amounts owing hereunder,  including
                  all  reasonable  attorney's  fees and court costs  incurred by
                  Lender in enforcing this Note shall,  at the option of Lender,
                  and, in the case of an Event of Default pursuant to (b) or (c)
                  above,   automatically,   be  immediately   due,  payable  and
                  collectible by Lender pursuant to applicable law.

                                       48


         5. Waiver. Borrower waives presentment and demand of payment, notice of
dishonor, protest and notice of protest of this Note, and shall pay all costs of
collection when incurred,  including, without limitation,  reasonable attorney's
fees, costs and other expenses

The right to plead  any and all  statutes  of  limitations  as a defense  to any
demands hereunder is hereby waived to the full extent permitted by law.

         6.  Costs.  The holder  hereof  shall be  entitled  to recover  and the
undersigned  agrees to pay when incurred all costs and expenses of collection of
this Note, including without limitation, reasonable attorney's fees.

         7.  Governing  Law.  This Note shall be governed by, and  construed and
enforced in  accordance  with,  the laws of the State of  California,  excluding
conflict  of laws  principles  that would cause the  application  of laws of any
other jurisdiction.

         8.       Tax.  Borrower hereby agrees and authorizes Lender to withhold
                  from payroll and any other  amounts  payable to the  Borrower,
                  any sums required to satisfy the federal,  state,  local,  and
                  foreign tax withholding  obligations of the Lender which arise
                  in connection with the Borrower's  Note.  Borrower  recognizes
                  that he  should  confer  with  the  appropriate  tax  advisors
                  regarding the reporting of this income.

         9.       Successors  and  Assigns.  The  provisions  of this Note shall
                  inure to the  benefit of and be binding  on any  successor  to
                  Borrower and shall extend to any holder hereof.

         10.      Amendment. Any term of this Note may be amended or waived with
                  the written consent of Borrower and Lender.


                    BOROWER DARYL MOSSMAN

                    By:_____________________________________

                    Print Name:______________________________




                    OFFICER OF LENDER

                    By:_____________________________________

                    Print Name:______________________________

                                       49