SYNC RESEARCH INC
SC 13G/A, 1998-02-10
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. ONE )*

                               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 21 Pages
<PAGE>   2
CUSIP NO.  785065103              13G                    PAGE  2  OF  21 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
      REPORTING          ------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              297,796

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

       5.5%

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

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 21 Pages
<PAGE>   3
CUSIP NO.  785065103              13G                    PAGE  3  OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              660,385

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

       5.5%

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

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 3 of 21 Pages
<PAGE>   4
CUSIP NO.  785065103              13G                    PAGE  4 OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              0

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

       5.5%

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

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 4 of 21 Pages
<PAGE>   5
CUSIP NO.  785065103              13G                    PAGE  5 OF  21 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

                              0

       NUMBER OF         -------------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               660,385
         EACH
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              0

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

                              660,385

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

       660,385

- --------------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          / / 
- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

       3.8%

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

       CO

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 5 of 21 Pages
<PAGE>   6
CUSIP NO.  785065103              13G                    PAGE  6 OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              0

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

       5.5%

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

       PN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 6 of 21 Pages
<PAGE>   7
CUSIP NO.  785065103              13G                    PAGE  7 OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              3,152

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

       5.6%

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

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 7 of 21 Pages
<PAGE>   8
CUSIP NO.  785065103              13G                    PAGE  8 OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH
                              0

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

       5.5%

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

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 8 of 21 Pages
<PAGE>   9
CUSIP NO.  785065103              13G                    PAGE  9 OF  21 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

                              0

       NUMBER OF         -------------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181
         EACH
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH                
                              0

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

       5.5%

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

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 9 of 21 Pages
<PAGE>   10
CUSIP NO.  785065103              13G                    PAGE  10 OF  21 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
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH  
                              0

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

       5.5%

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

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 10 of 21 Pages
<PAGE>   11
CUSIP NO.  785065103              13G                    PAGE  11 OF  21 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

                              0

       NUMBER OF         -------------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY               958,181
         EACH
      REPORTING          -------------------------------------------------------
        PERSON           7    SOLE DISPOSITIVE POWER
         WITH 
                              0

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

       5.5%

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

       IN

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

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 11 of 21 Pages
<PAGE>   12
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 Offshore Management, N.V., a Netherlands Antilles corporation
           ("Canaan 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 Corporation
           (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, Canaan Corporation 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 Corporation 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 Corporation is a
           corporation, each organized under the laws of the Netherlands
           Antilles. Each of the Partners are citizens of the United States.


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").


                               Page 12 of 21 Pages
<PAGE>   13
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 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,

(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 13d-1(b)(1)(ii)(F),

(g)     ___ Parent Holding Company, in accordance with Rule 13d-1(b)(ii)(G); see
        Item 7,

(h)     ___ Group, in accordance with Rule 13d-1(b)(1)(ii)(H).

           Not Applicable

Item 4.    Ownership

(a)        Canaan Venture owns 297,796 shares of Common Stock. Canaan Venture
           Offshore owns 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 outlined in Item 2. In
           addition, Mr. Rein owns 3,125 shares of Common Stock as an
           individual.

(b)        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, representing beneficial ownership of 5.5% of
           the Company. 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, representing beneficial
           ownership of 5.5%. Canaan Corporation, by virtue of its status as a
           general partner of Canaan Venture Offshore, may be deemed to be the
           beneficial owner of 660,385 shares, representing beneficial ownership
           of 3.8%. 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, representing beneficial ownership of 5.5%. By
           virtue of their status as general partners of Canaan Partners, the
           Partners may each be deemed to be the beneficial owner of 958,181
           shares representing in the case of each Partner, beneficial ownership
           of 5.5%. In addition, Mr. Rein owns additional shares as outlined in
           (a) above, which increases his beneficial percentage ownership to
           5.6%. The foregoing percentages are calculated based on the
           17,282,153 shares of Common Stock reported to be outstanding in the
           Quarterly Report on Form 10-Q of the Issuer for the quarter ended
           September 30, 1997.


                               Page 13 of 21 Pages
<PAGE>   14


<TABLE>
<CAPTION>
                                                 NUMBER OF SHARES
                                                 ----------------
(c)  Reporting Person             (i)           (ii)          (iii)          (iv)
     ----------------             ---           ----          -----          ----
<S>                             <C>            <C>           <C>           <C>    
Canaan Venture                  297,796        660,385       297,796       660,385
Canaan Venture Offshore         660,385        297,796       660,385       297,796
Canaan Management                     0        958,181             0       958,181
Canaan Corporation                    0        660,385             0       660,385
Canaan Partners                       0        958,181             0       958,181
Harry T. Rein                     3,125        958,181         3,125       958,181
James J. Fitzpatrick                  0        958,181             0       958,181
Gregory Kopchinsky                    0        958,181             0       958,181
Robert J. Migliorino                  0        958,181             0       958,181
Eric A. Young                         0        958,181             0       958,181
</TABLE>

(i)        Sole power to vote or direct the vote
(ii)       Shared power to vote or to direct the vote
(iii)      Sole power to dispose or to direct the disposition of
(iv)       Shared power to dispose or to direct the disposition of

Item 5.    Ownership of Five Percent or Less of a Class
           Not applicable.

Item 6.    Ownership of More than Five Percent on Behalf of Another Person
           Not applicable.

Item 7.    Identification and Classification of the Subsidiary which Acquired
           the Security Being Reported on by the Parent Holding Company Not
           applicable.

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).


DATE:  February 10, 1998


                               Page 14 of 21 Pages
<PAGE>   15
                                   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.


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

By:               *
        -------------------------------------
        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:               *
        -------------------------------------
        General Partner

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

By:               *
        -------------------------------------
        General Partner

Canaan Offshore Management, N.V.

By:               *
        -------------------------------------
        Director

Canaan Venture Partners L.P.

By:               *
        -------------------------------------
        General Partner


                              Page 15 of 21 Pages
<PAGE>   16
                  *
        -------------------------------------
        Harry T. Rein


                  *
        -------------------------------------
        James J. Fitzpatrick


                  *
        -------------------------------------
        Gregory Kopchinsky


                  *
        -------------------------------------
        Robert J. Migliorino


                  *
        -------------------------------------
        Eric A. Young


                                                 *By:  /s/ Guy M. Russo
                                                       -------------------------
                                                       Guy M. Russo
                                                       Attorney-in-Fact

This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney
filed with the Securities and Exchange Commission on April 22, 1997, in
connection with a Schedule 13D for Alarmguard Holdings, Inc., which Powers of
Attorney are incorporated herein by reference and copies of which are attached
hereto as Exhibit 2.


                              Page 16 of 21 Pages

<PAGE>   1
                                                                       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.

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

By:               *
        -------------------------------------
        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:               *
        -------------------------------------
        General Partner

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

By:               *
        -------------------------------------
        General Partner

Canaan Offshore Management, N.V.

By:               *
        -------------------------------------
        Director

Canaan Venture Partners L.P.

By:               *
        -------------------------------------
        General Partner


                              Page 17 of 21 Pages
<PAGE>   2
                  *
        -------------------------------------
        Harry T. Rein


                  *
        -------------------------------------
        James J. Fitzpatrick


                  *
        -------------------------------------
        Gregory Kopchinsky


                  *
        -------------------------------------
        Robert J. Migliorino


                  *
        -------------------------------------
        Eric A. Young


                                                 *By:  /s/ Guy M. Russo
                                                       -------------------------
                                                       Guy M. Russo
                                                       Attorney-in-Fact

This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney
filed with the Securities and Exchange Commission on April 22, 1997, in
connection with a Schedule 13D for Alarmguard Holdings, Inc., which Powers of
Attorney are incorporated herein by reference and copies of which are attached
hereto as Exhibit 2.


                              Page 18 of 21 Pages

<PAGE>   1
                                                                       Exhibit 2

                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Guy M. Russo his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities (until
revoked in writing) to sign any and all instruments, certificates and documents
required to be executed on behalf of himself as an individual or in his capacity
as a general partner or authorized signatory, as the case may be, on behalf of
any of Canaan Venture Limited Partnership; Canaan Venture Offshore Limited
Partnership, C.V.; Canaan Offshore Management, N.V.; Canaan Management Limited
Partnership or Canaan Venture Partners L.P. pursuant to the Securities Act of
1933, as amended, (the "Securities Act"), or the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and any and all regulations promulgated
thereunder and to file the same, with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission,
and with any other entity when and if such is mandated by the Securities Act,
the Exchange Act or by the By-laws of the National Association of Securities
Dealers, Inc., granting unto said attorney-in-fact and agent full power and
authority to do and perform each and every act and thing requisite and necessary
fully to all intents and purposes as he might or could do in person thereby, and
ratifying and confirming all that said attorney-in-fact and agent, or his
substitute or substitutes, may lawfully do or cause to be done by virtue hereof,
or may have done in connection with the matters described above.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


                              Page 19 of 21 Pages
<PAGE>   2
IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 14th day of
April, 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 OFFSHORE MANAGEMENT, N.V.

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


CANAAN MANAGEMENT LIMITED PARTNERSHIP

By:  Canaan Venture Partners L.P.
        Its General Partner

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


                              Page 20 of 21 Pages
<PAGE>   3
CANAAN VENTURE PARTNERS L.P.

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


     /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 21 of 21 Pages




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