SYNC RESEARCH INC
SC 13G, 1997-02-11
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO.___)*

                               Sync Research, Inc.
                               -------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
                          ----------------------------
                         (Title of Class of Securities)

                                    785065103
                                    ---------
                                 (CUSIP Number)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                               Page 1 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  2  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Canaan Venture Limited Partnership

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]
- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware Limited Partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              297,796
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               660,385

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                297,796

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              660,385

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 2 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  3  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Canaan Venture Offshore Limited Partnership, C.V.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Netherlands Antilles Limited Partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              660,385
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               297,796

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                660,385

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              297,796

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 3 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  4  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Canaan Management Limited Partnership

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware Limited Partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              0
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                0

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!




                               Page 4 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  5  OF  19  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Canaan Offshore Management, N.V.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Netherlands Antilles Corporation

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              less than five percent (5%)
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               less than five percent (5%)

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                less than five percent (5%)

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              less than five percent (5%)

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       less than five percent (5%)

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       less than five percent (5%)

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       CO

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 5 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  6  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Canaan Venture Partners L.P.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware Limited Partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              0
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                0

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 6 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  7  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Harry T. Rein

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              3,152
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                3,152

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       961,333

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.8%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 7 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  8  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       James J. Fitzpatrick

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              0
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                0

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 8 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  9  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Gregory Kopchinsky

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              6,000
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                6,000

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       964,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.8%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 9 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  10  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Robert J. Migliorino

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              0
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                0

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       958,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.7%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 10 of 20 pages



CUSIP NO. 785065103                 13G                 PAGE  11  OF  20  PAGES




- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Eric A. Young

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                      (a) [ ]
                                                                      (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

       United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                              2,000
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                2,000

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                              958,181

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       960,181

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       5.8%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 11 of 20 pages





ITEM 1(A).        NAME OF ISSUER:

           Sync Research, Inc.

ITEM 1 (B).       ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

           40 Parker
           Irvine, CA  92718

ITEM 2 (A).       NAME OF PERSON FILING:

           This  statement is filed by Canaan  Venture  Limited  Partnership,  a
           Delaware  limited  partnership,  ("Canaan  Venture"),  Canaan Venture
           Offshore  Limited  Partnership  C.V., a Netherlands  Antilles limited
           partnership  ("Canaan Venture  Offshore"),  Canaan Management Limited
           Partnership,  a Delaware limited partnership,  ("Canaan Management"),
           Canaan Management Offshore, N.V., a Netherlands Antilles corporation,
           Canaan  Venture  Partners  L.P.,  a  Delaware  limited   partnership,
           ("Canaan Partners") and Harry T. Rein, James J. Fitzpatrick,  Gregory
           Kopchinsky, Robert J. Migliorino and Eric A. Young (collectively, the
           "Partners").  Canaan  Management  (which  serves as the sole  general
           partner of Canaan  Venture  and one of the two  general  partners  of
           Canaan Venture  Offshore),  Canaan Management  Offshore,  N.V. (which
           serves as the other  general  partner  of Canaan  Venture  Offshore),
           Canaan  Partners  (which  serves  as the  general  partner  of Canaan
           Management) and the Partners (who serve as general partners of Canaan
           Partners), are collectively referred to as the "Reporting Persons" in
           this Schedule 13G.

ITEM 2 (B).       ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

           Except in the case of Canaan Venture  Offshore and Eric A. Young, the
           principal  business address of the Reporting  Persons is 105 Rowayton
           Avenue,  Rowayton,  CT 06853. The principal address of Canaan Venture
           Offshore   and  Canaan   Management   Offshore,   N.V.   is  c/o  ABN
           Trustcompany,  Pietermaai 15, Curacao, the Netherlands Antilles.  The
           principal  business  address of Eric A. Young is 2884 Sand Hill Road,
           Suite 115, Menlo Park, CA 94025.

ITEM 2 (C).       CITIZENSHIP:

           Each of Canaan  Venture,  Canaan  Management and Canaan Partners is a
           limited  partnership  organized  under the laws of  Delaware.  Canaan
           Venture  Offshore  is a limited  partnership  and  Canaan  Management
           Offshore,  N.V.  is a  corporation  organized  under  the laws of the
           Netherlands Antilles. Each of the Partners are citizens of the United
           States.

                               Page 12 of 20 pages





ITEM 2 (D).       TITLE OF CLASS OF SECURITIES:

           This Schedule 13G report relates to the Common Stock,  par value $.01
           ("Common Stock") of Sync Research, Inc. ("the Company").

ITEM 2 (E).       CUSIP NUMBER:

           CUSIP number 785065103.

ITEM 3.           IF THIS  STATEMENT  IS FILED  PURSUANT TO RULES  13D-1(B),  OR
                  13D-2(B), CHECK WHETHER THE PERSON FILING IS A:


                  (a)  [   ]        Broker or Dealer registered under Section 15
                                    of the Securities  Exchange Act of 1934 (the
                                    "Act").

                  (b)  [   ]        Bank as  defined in Section 3 (a) (6) of the
                                    Act.

                  (c)  [   ]        Insurance Company as defined in Section 3(a)
                                    (19) of the Act.

                  (d)  [   ]        Investment  Company registered under Section
                                    8 of the Investment Company Act of 1940.

                  (e)  [   ]        Investment  Adviser registered under Section
                                    203 of the Investment Advisers Act of 1940.

                  (f)  [   ]        Employee Benefit Plan, Pension Fund which is
                                    subject to the  provisions  of the  Employee
                                    Retirement  Income  Security  Act of 1974 or
                                    Endowment  Fund; see Rule 13d-1 (b) (1) (ii)
                                    (F) of the Act.

                  (g)  [   ]        Parent Holding Company,  in  accordance with
                                    Rule 13d-1 (b) (ii) (G) of the Act.

                  (h)  [   ]        Group, in accordance with Rule 13d-1 (b) (1)
                                    (ii) (H) of the Act.

         Not applicable.

ITEM 4.  OWNERSHIP:

(a)        Amount Beneficially Owned:

           By virtue of their common control,  Canaan Venture and Canaan Venture
           Offshore  each may be deemed to be the  beneficial  owners of 958,181
           shares of Common Stock. Canaan Management, by virtue of its status as
           general partner of Canaan Venture and Canaan Venture Offshore, may be
           deemed to be the beneficial owner of 958,181 shares. By virtue of its
           status as general partner of Canaan  Management,  Canaan Partners may
           be deemed to be the beneficial owner of 958,181 shares.  By virtue of
           their  status as general  partners of Canaan  Partners,  the Partners
           (except for Messrs. Rein, Kopchinsky and Young) may each be deemed to
           be the  beneficial  owner of  958,181  shares.  Harry T.




                               Page 13 of 20 pages





           Rein may be  deemed to be the  beneficial  owner of  961,333  shares.
           Gregory  Kopchinsky  may be  deemed  to be the  beneficial  owner  of
           964,181  shares.  Eric A.  Young may be  deemed to be the  beneficial
           owner of 960,181 shares.

           Canaan  Venture is the record owner of 297,796 shares of Common Stock
           and Canaan Venture  Offshore is the record owner of 660,385 shares of
           Common  Stock.  All other  Reporting  Persons  hold their  respective
           beneficially  owned  shares due to their  relationships  to the above
           Partnerships  as outilined  in Item 2. In addition,  Harry T. Rein is
           the record owner of 3,152 shares of Common Stock,  Gregory Kopchinsky
           is the record owner of 6,000 shares of Common Stock, and Eric A.
           Young is the record owner of 2,000 shares of Common Stock.


(b)        Percent of Class:  Canaan  Venture:  5.7%;  Canaan Venture  Offshore:
           5.7%;  Canaan  Management:  5.7%;  Canaan  Partners:  5.7%;  and  the
           Partners (except Messrs. Kopchinsky,  Rein and Young): 5.7%; Harry T.
           Rein, Gregory Kopchinsky and Eric A. Young: 5.8% respectively.

           The foregoing  percentages  are  calculated  based on the  16,674,766
           shares of Common Stock  reported to be  outstanding  in the Quarterly
           Report on Form 10-Q of Sync  Research,  Inc.  for the  quarter  ended
           9/30/96.

(c)        Number of shares as to which such person has:

           (i) Sole power to vote or direct the vote:  Canaan  Venture:  297,796
           shares; Canaan Venture Offshore: 660,385 shares; Harry T. Rein: 3,152
           shares;  Gregory  Kopchinsky:  6,000 shares; and Eric A. Young: 2,000
           shares.

           (ii)  Shared  power to vote or to direct  the vote:  Canaan  Venture:
           660,385  shares;  Canaan Venture  Offshore:  297,796  shares;  Canaan
           Management:  958,181 shares; Canaan Partners: 958,181 shares; and the
           Partners: 958,181 shares.

           (iii) Sole power to dispose or to direct the  disposition  of: Canaan
           Venture:  297,796 shares;  Canaan Venture  Offshore:  660,385 shares;
           Harry T. Rein: 3,152 shares;  Gregory  Kopchinsky:  6,000 shares; and
           Eric A. Young: 2,000 shares.

           (iv) Shared power to dispose or to direct the  disposition of: Canaan
           Venture:  660,385 shares;  Canaan Venture  Offshore:  297,796 shares;
           Canaan Management:  958,181 shares; Canaan Partners:  958,181 shares;
           and the Partners: 958,181 shares.

ITEM 5.    OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

           Canaan Offshore  Management,  N.V., as of the date hereof, has ceased
           to be the beneficial  owner of more than five percent of the class of
           securities.

ITEM 6.    OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

           Not applicable.


                               Page 14 of 20 pages






ITEM 7.    IDENTIFICATION  AND  CLASSIFICATION  OF THE SUBSIDIARY WHICH ACQUIRED
           THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

           Not applicable.

                               Page 15 of 20 pages





ITEM 8.    IDENTIFICATION  AND CLASSIFICATION OF MEMBERS OF THE GROUP.

           Each of the reporting  persons  expressly  disclaims  membership in a
           "Group" as defined in Rule 13d-1 (b) (ii) (H).

ITEM 9.    NOTICE OF DISSOLUTION OF GROUP.

           Not applicable.

ITEM 10.   CERTIFICATION.

           Not  applicable.  This  Schedule  13G is not filed  pursuant  to Rule
           13d-1(b).


                               Page 16 of 20 pages




                                   SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, each of the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.

February 10, 1997


Canaan Venture Limited Partnership
By:     Canaan Management Limited Partnership
        Its General Partner
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner


Canaan Venture Offshore Limited Partnership, C. V.
By:     Canaan Management Limited Partnership
        Its General Partner
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner


Canaan Management Limited Partnership
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner


Canaan Offshore Management, N.V.

By:      /s/  Harry T. Rein
        --------------------------
        President


Canaan Venture Partners L.P.

By:      /s/  Harry T. Rein
        --------------------------
        General Partner

                               Page 17 of 20 pages





 /s/  Harry T. Rein
 ---------------------------
Harry T. Rein


 /s/  James J. Fitzpatrick
 ---------------------------
James J. Fitzpatrick


 /s/  Gregory Kopchinsky
 ---------------------------
Gregory Kopchinsky


 /s/  Robert J. Migliorino
 ---------------------------
Robert J. Migliorino


 /s/  Eric A. Young
 ---------------------------
Eric A. Young



                               Page 18 of 20 pages





                                                                       EXHIBIT 1

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(f) (1) under the Securities  Exchange Act of 1934,
as  amended,  the  undersigned  agree  that only one  statement  containing  the
information  required by Schedule  13G need be filed by each of the  undersigned
with respect to the ownership by each of the  undersigned  of shares of stock of
Sync   Research,   Inc.  This  Agreement  may  be  executed  in  any  number  of
counterparts, each of which shall be deemed an original.

February 10, 1997


Canaan Venture Limited Partnership
By:     Canaan Management Limited Partnership
        Its General Partner
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner

Canaan Venture Offshore Limited Partnership, C. V.
By:     Canaan Management Limited Partnership
        Its General Partner
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner

Canaan Management Limited Partnership
By:     Canaan Venture Partners L.P.
        Its General Partner

By:      /s/  Harry T. Rein
        --------------------------
        General Partner

Canaan Offshore Management, N.V.

By:      /s/  Harry T. Rein
        --------------------------
        President

Canaan Venture Partners L.P.

By:      /s/  Harry T. Rein
        --------------------------
        General Partner

                               Page 19 of 20 pages





 /s/  Harry T. Rein
 ---------------------------
Harry T. Rein


 /s/  James J. Fitzpatrick
 ---------------------------
James J. Fitzpatrick


 /s/  Gregory Kopchinsky
 ---------------------------
Gregory Kopchinsky


 /s/  Robert J. Migliorino
 ---------------------------
Robert J. Migliorino


 /s/  Eric A. Young
 ---------------------------
Eric A. Young




                               Page 20 of 20 pages



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