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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000902664-97-000050.txt : 19970221
<SEC-HEADER>0000902664-97-000050.hdr.sgml : 19970221
ACCESSION NUMBER:		0000902664-97-000050
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		19970210
SROS:			NASD

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ACT NETWORKS INC
		CENTRAL INDEX KEY:			0000942132
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER COMMUNICATIONS EQUIPMENT [3576]
		IRS NUMBER:				770396887
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-45161
		FILM NUMBER:		97522164

	BUSINESS ADDRESS:	
		STREET 1:		188 CAMINO RD
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012
		BUSINESS PHONE:		8053882474

	MAIL ADDRESS:	
		STREET 1:		188 CAMINO RUIZ
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARDSLEY ADVISORY PARTNERS
		CENTRAL INDEX KEY:			0000900529
		STANDARD INDUSTRIAL CLASSIFICATION:	 []
		IRS NUMBER:				0
		STATE OF INCORPORATION:			CT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		646 STEAMBOAT ROAD
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830

	MAIL ADDRESS:	
		STREET 1:		CHRISTINE Y HOMER
		STREET 2:		900 THIRD AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<TEXT>


                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                               ________________

                                 SCHEDULE 13G/A
                               ________________

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                              (AMENDMENT NO. 1)*

                              Act Networks, Inc.
                               (NAME OF ISSUER)
                                       
                         Common Stock, $.01 par value
                        (TITLE OF CLASS OF SECURITIES)


                                  000975 10 2
                                (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 5 PAGES 
<PAGE>



                                      13G

CUSIP No.  000975 10 2
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. 
          OF ABOVE PERSON 
            Ardsley Advisory Partners
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** 
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
            Connecticut
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                        0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                        3,000
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                        0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                        3,000
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
            3,000
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
            0%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON **
            IA
_____________________________________________________________________________
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!

                               PAGE 2 OF 5 PAGES
<PAGE>



                                      13G

CUSIP No.  000975 10 2
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. 
          OF ABOVE PERSON 
            Philip J. Hempleman
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP ** 
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
            United States
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                        0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                        3,000
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                        0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                        3,000
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
            3,000
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES **                          [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
            0%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON **
            IN
_____________________________________________________________________________
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!

                               PAGE 3 OF 5 PAGES
<PAGE>


            The Schedule 13G initially filed for the year ended December 31, 
1995 of (i) Ardsley Advisory Partners and (ii) Philip J. Hempleman relating 
to the common stock, par value $.001, issued by Act Networks, Inc. is hereby 
amended as follows:

ITEM 4.     OWNERSHIP.

            Not Applicable.

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

            If this statement is being filed to report the fact that as of the 
date hereof the reporting person has ceased to be the beneficial owner of more 
than five percent of the class of securities, check the following  [x]


                                   PAGE 4 OF 5 PAGES

<PAGE>



ITEM 10.    CERTIFICATION.  (if filing pursuant to Rule 13d-1(b))

            By signing below Ardsley Advisory Partners and Philip J. Hempleman
certify that, to the best of their knowledge and belief, the securities
referred to above were acquired in the ordinary course of business, were not
acquired for the purpose of and do not have the effect of changing or
influencing the control of the issuer of such securities and were not acquired
in connection with or as a participant in any transaction having such purposes
or effect.


                                   SIGNATURE

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


                                    February 6, 1997



                                    /s/ PHILIP J. HEMPLEMAN  
                                    Philip J. Hempleman, as
                                    Managing Partner of 
                                    Ardsley Advisory Partners


                                    /s/ PHILIP J. HEMPLEMAN  
                                    Philip J. Hempleman



                                     PAGE 5 OF 5 PAGES

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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