TRANSWITCH CORP /DE
SC 13G/A, 1997-02-13
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
 
                                                           OMB APPROVAL
                                                      --------------------------
                                                      OMB NUMBER: 3235-0145
                                                      EXPIRES: DECEMBER 31, 1997
                                                      ESTIMATED AVERAGE BURDEN
                                                      HOURS PER RESPONSE...14.90
                                                      --------------------------


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                              (AMENDMENT NO.  1)*

                            TranSwitch Corporation
                            ----------------------
                               (Name of Issuer)

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

                                  894065 10 1
                                  -----------
                                 (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>
 
CUSIP NO. 894065101                   13G                   PAGE 2 OF 17 PAGES 
- --------------------                                        --------------------

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

      Advanced Technology Ventures II, L.P.
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      Delaware                                                                  
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *                                                
                                                                                
      PN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 2 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 3 OF 17 PAGES 
- --------------------                                        --------------------

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

      Advanced Technology Ventures III, L.P.
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      Delaware                                                                  
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *                                                
                                                                                
      PN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 3 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 4 OF 17 PAGES 
- --------------------                                        --------------------

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

      NP Associates
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      New York
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *                                                
                                                                                
      PN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 4 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 5 OF 17 PAGES 
- --------------------                                        --------------------

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

      ATV Associates III, L.P.
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      Delaware                                                                  
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *                                                
                                                                                
      PN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 5 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 6 OF 17 PAGES 
- --------------------                                        --------------------

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

      Albert E. Paladino
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      United States
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              27,064 shares 
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             27,064 shares 
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      213,310 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.8%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *                                                
                                                                                
      IN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 6 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 7 OF 17 PAGES 
- --------------------                                        --------------------

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

      Pieter J. Schiller
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      United States
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *     

      IN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 7 of 17 pages
<PAGE>
 
CUSIP NO. 894065101                   13G                   PAGE 8 OF 17 PAGES 
- --------------------                                        --------------------

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

      Jos C. Henkens
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                         
                                                         (a) [ ]                
      Not Applicable                                     (b) [ ]                
- --------------------------------------------------------------------------------
 3    SEC USE ONLY                                                              
                                                                                
- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION                                      
                                                                                
      United States
- --------------------------------------------------------------------------------
                                                                                
 NUMBER OF         5  SOLE VOTING POWER                                         
                                                                                
  SHARES              0 shares                                                  
                   -------------------------------------------------------------
BENEFICIALLY       6  SHARED VOTING POWER                                       
                                                                                
  OWNED BY            186,246 shares 
                   -------------------------------------------------------------
   EACH            7  SOLE DISPOSITIVE POWER                                    
                                                                                
REPORTING             0 shares                                                  
                   -------------------------------------------------------------
 PERSON            8  SHARED DISPOSITIVE POWER                                  
                                                                                
  WITH                186,246 shares 
- --------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON              
                                                                                
      186,246 shares 
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*  [ ]
                                                                                
      Not Applicable
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                           
                                                                                
      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON *     

      IN                                                                        
- ------------------------------------------------------------------------------- 
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                              Page 8 of 17 pages
<PAGE>
 
                                  Schedule 13G
                                  ------------



       Item 1(a).  Name of Issuer:  TranSwitch Corporation
                   ---------------                        

       Item 1(b).  Address of Issuer's Principal Executive Offices:
                   ----------------------------------------------- 
                   8 Progress Drive, Shelton, Connecticut 06484.

       Item 2(a).  Names of Persons Filing:  Advanced Technology Ventures II,
                   -----------------------                                   
                   L.P., Advanced Technology Ventures III, L.P., NP Associates,
                   ATV Associates III, L.P., Albert E. Paladino, Pieter J.
                   Schiller and Jos C. Henkens.

                   NP Associates is the sole general partner of Advanced
                   Technology Venture II, L.P. ATV Associates III, L.P. is the
                   sole general partner of Advanced Technology Ventures III,
                   L.P. Messrs. Paladino, Schiller and Henkens are individual
                   general partners of both NP Associates and ATV Associates
                   III, L.P.

       Item 2(b).  Address of Principal Business Office or, if None, Residence:
                   ----------------------------------------------------------- 

                   The address of the principal business office of Advanced
                   Technology Ventures II, L.P., Advanced Technology Ventures
                   III, L.P., NP Associates, ATV Associates III, L.P., Albert E.
                   Paladino and Pieter J. Schiller is 281 Winter Street,
                   Waltham, MA 02154. The address of Jos C. Henkens is 485
                   Ramona Street, Suite 200, Palo Alto, California 94301.


       Item 2(c).  Citizenship:  Advanced Technology Ventures II, L.P., Advanced
                   -----------

                   Technology Ventures III, L.P. and ATV Associates III, L.P.
                   are limited partnerships organized under the laws of the
                   State of Delaware. NP Associates is a limited partnership
                   organized under the laws of the State of New York. Each of
                   Messrs. Paladino, Schiller and Henkens is a United States
                   citizen.

       Item 2(d).  Title of Class of Securities: Common Stock, $.01 par value
                   ----------------------------                              
                   per share

       Item 2(e).  CUSIP Number:  894065 10 1
                   -------------
 
       Item 3.     If this statement if 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.
 
<PAGE>
 
                   (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 Advisor 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

                     Each of Advanced Technology Ventures II, L.P., Advanced
                     Technology Ventures III, L.P., NP Associates, ATV
                     Associates III, L.P. (individually an "Entity" and
                     collectively the "Entities"), Pieter J. Schiller and Jos C.
                     Henkens may be deemed to own beneficially 186,246 shares of
                     Common Stock as of December 31, 1996. Albert E. Paladino
                     may be deemed to own beneficially 213,310 shares of Common
                     Stock as of December 31, 1996.

                     As of December 31, 1996, Advanced Technology Ventures II,
                     L.P. was the record owner of 26,957 shares of Common Stock,
                     and Advanced Technology Ventures III, L.P. was the record
                     owner of 159,289 shares of Common Stock. (The shares held
                     of record by Advanced Technology Ventures II, L.P. and
                     Advanced Technology Ventures III, L.P. are referred to
                     herein collectively as the "Record Shares"). By virtue of
                     the affiliate relationships among the Entities, each Entity
                     may be deemed to own beneficially all of the Record Shares.
                     Hence, each Entity may be deemed to own beneficially
                     186,246 shares of Common Stock. In their capacities as
                     individual general 
<PAGE>
 
                     partners of NP Associates and ATV Associates III, L.P.,
                     each of Messrs. Paladino, Schiller and Henkens may be
                     deemed to own beneficially 186,246 shares of Common Stock.
                     Mr. Paladino may be deemed to own beneficially an
                     additional 27,064 shares of Common Stock.

                 (b) Percent of Class:

                     Advanced Technology Ventures II, L.P.:  1.6%
                     Advanced Technology Ventures III, L.P.:  1.6%
                     NP Associates:  1.6%
                     ATV Associates III, L.P.:  1.6%
                     Albert E. Paladino:  1.8%
                     Pieter J. Schiller:  1.6%
                     Jos C. Henkens:  1.6%

                     The foregoing percentages are calculated based on the
                     11,869,512 shares of Common Stock reported to be
                     outstanding as of October 31, 1996 in the quarterly report
                     on Form 10Q as filed with the SEC for the quarterly period
                     ended September 30, 1996.

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

                     (i) sole power to vote or to direct the vote:

                         Advanced Technology Ventures II, L.P.:   0 shares
                         Advanced Technology Ventures III, L.P.:  0 shares
                         NP Associates:  0 shares
                         ATV Associates III, L.P.:  0 shares
                         Albert E. Paladino:  27,064 shares
                         Pieter J. Schiller:  0 shares
                         Jos C. Henkens:  0 shares


                     (ii) shared power to vote or to direct the vote:

                         Advanced Technology Ventures II, L.P.: 186,246 shares
                         Advanced Technology Ventures III, L.P.: 186,246 shares
                         NP Associates:  186,246 shares
                         ATV Associates III, L.P.:  186,246 shares
                         Albert E. Paladino:  186,246 shares
                         Pieter J. Schiller:  186,246 shares
                         Jos C. Henkens:  186,246 shares
<PAGE>
 
                    (iii) sole power to dispose or direct the disposition:

                         Advanced Technology Ventures II, L.P.:  0 shares
                         Advanced Technology Ventures III, L.P.:  0 shares
                         NP Associates:  0 shares
                         ATV Associates III, L.P.:  0 shares
                         Albert E. Paladino:  27,064 shares
                         Pieter J. Schiller:  0 shares
                         Jos C. Henkens:  0 shares


                     (iv) shared power to dispose or direct the disposition:

                         Advanced Technology Ventures II, L.P.:  186,246 shares
                         Advanced Technology Ventures III, L.P.:  186,246 shares
                         NP Associates:  186,246 shares
                         ATV Associates III, L.P.:  186,246 shares
                         Albert E. Paladino:  186,246 shares
                         Pieter J. Schiller:  186,246 shares
                         Jos C. Henkens:  186,246 shares

                 Each of reporting persons expressly disclaims beneficial
                 ownership of any shares of Common Stock of TranSwitch, except
                 in the cases of Advanced Technology Ventures II, L.P. for the
                 26,957 shares which it holds of record, Advanced Technology
                 Ventures III, L.P. for the 159,289 shares which it holds of
                 record and Mr. Paladino for the 27,064 shares which he holds of
                 record.

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].

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.
<PAGE>
 
Item 8.  Identification and Classification of Members of the Group.
         --------------------------------------------------------- 

         Not Applicable.  The Reporting Persons expressly disclaim membership
         in a "group" within the meaning of Regulation 13D.

Item 9.  Notice of Dissolution of Group.
         ------------------------------ 
 
         Not Applicable.

Item 10.  Certification.
          ------------- 

          Not Applicable.  This statement on Schedule 13G is not filed
          pursuant to Rule 13d-1(b).
<PAGE>
 
                                   SIGNATURES
                                   ----------

     After reasonable inquiry and to the best of my knowledge and belief, we
certify that the information set forth in this statement is true, complete and
correct. We also hereby agree to file this statement jointly pursuant to the
Agreement set forth as Exhibit 1 hereto.

Date:  February 13, 1997


ADVANCED TECHNOLOGY VENTURES II, L.P.

By:  NP Associates               
                                 
By:         *                    
   ------------------------------
   General Partner                

NP ASSOCIATES  
                                 
By:         *                    
   ------------------------------
   General Partner                


/s/ Albert E. Paladino
- ------------------------------
Albert E. Paladino

               *
- ------------------------------ 
Pieter J. Schiller

               *
- ------------------------------ 
Jos C. Henkens

ADVANCED TECHNOLOGY VENTURES III, L.P.

By:  ATV Associates III, L.P.  
                               
By:          *                 
   --------------------------- 
   General Partner              

ATV ASSOCIATES III, L.P.  
                               
By:          *                 
   --------------------------- 
   General Partner              

/s/ Albert E. Paladino
- ------------------------------
Albert E. Paladino

               *
- ------------------------------ 
Pieter J. Schiller

               *
- ------------------------------ 
Jos C. Henkens

                                                    *By:  /s/ Albert E. Paladino
                                                         -----------------------
                                                         Albert E. Paladino
                                                         Attorney-in-Fact

 
     This Schedule 13G is executed pursuant to a Power of Attorney, filed with
the Securities and Exchange Commission on or about February 14, 1996, in
connection with a Schedule 13G for TranSwitch Corporation, which Power of
Attorney is incorporated herein by reference, and a copy of which is attached
hereto as Exhibit 2.
          --------- 
<PAGE>
 
                                   EXHIBIT 1
                                   -------- 

                                   AGREEMENT
                                   ---------

     Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of TranSwitch Corporation.
 
     This Agreement may be executed in any number of counterparts, each of which
shall be deemed an original.

Date:  February 13, 1997


ADVANCED TECHNOLOGY VENTURES II, L.P.

By:  NP Associates                
                                  
By:         *                     
   ------------------------------ 
   General Partner                 

NP ASSOCIATES 
                                  
By:         *                     
   ------------------------------ 
   General Partner                 

/s/ Albert E. Paladino
- ------------------------------
Albert E. Paladino

               *
- ------------------------------ 
Pieter J. Schiller

               *
- ------------------------------ 
Jos C. Henkens

ADVANCED TECHNOLOGY VENTURES III, L.P.

By:  ATV Associates III, L.P.

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

ATV ASSOCIATES IV, L.P.
                                  
By:         *                     
   ------------------------------ 
   General Partner                 

/s/ Albert E. Paladino
- ------------------------------
Albert E. Paladino

               *
- ------------------------------ 
Pieter J. Schiller

               *
- ------------------------------ 
Jos C. Henkens

                                                    *By:  /s/ Albert E. Paladino
                                                         -----------------------
                                                         Albert E. Paladino
                                                         Attorney-in-Fact

 
     This Agreement is executed pursuant to an executed Power of Attorney, which
is attached hereto as Exhibit 2.
                      --------- 
<PAGE>
 
                                                                       EXHIBIT 2
                                                                       ---------



                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Albert E. Paladino his true and lawful
attorney-in fact, with full power of substitution, to sign any and all
instruments, certificates and documents that may be necessary, desirable or
appropriate to be executed on behalf of himself as an individual or in his
capacity as a general partner of any partnership, pursuant to Section 13 or 16
of 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 Exchange Act or by the By-laws of the National Association of
Securities Dealers, Inc., granting unto said attorney-in-fact full power and
authority to do and perform each and every act and thing necessary, desirable or
appropriate, fully to all intents and purposes as he might or could do in
person, thereby ratifying and confirming all that said attorney-in fact, or his
substitutes, may lawfully do or cause to be done by virtue hereof.

    IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
14 day of February, 1996.


By  /s/ Pieter J. Schiller
    -------------------------------
    Pieter J. Schiller


By: 
    -------------------------------
            Jos C. Henkens
<PAGE>
 
                                                                       EXHIBIT 2
                                                                       ---------



                               POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Albert E. Paladino his true and lawful
attorney-in fact, with full power of substitution, to sign any and all
instruments, certificates and documents that may be necessary, desirable or
appropriate to be executed on behalf of himself as an individual or in his
capacity as a general partner of any partnership, pursuant to Section 13 or 16
of 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 Exchange Act or by the By-laws of the National Association of
Securities Dealers, Inc., granting unto said attorney-in-fact full power and
authority to do and perform each and every act and thing necessary, desirable or
appropriate, fully to all intents and purposes as he might or could do in
person, thereby ratifying and confirming all that said attorney-in fact, or his
substitutes, may lawfully do or cause to be done by virtue hereof.

     IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
14 day of February, 1996.


By:
    ------------------------------
     Pieter J. Schiller


By:  /s/ Jos C. Henkens
    ------------------------------
     Jos C. Henkens


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