SUMMIT VENTURES IV LP
SC 13G, 2000-02-14
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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. 2 )*

                       Ditech Communications Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.001 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    25500M10
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 1999
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

         Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

                   [ ] Rule 13d-1(b)
                   [ ] Rule 13d-1(c)
                   [X] Rule 13d-1(d)

*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 39 Pages
<PAGE>
- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 2 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Ventures IV, 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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 3 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Partners IV, 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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 4 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stamps, Woodsum & Co. IV
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


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

        Massachusetts general partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 5 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Subordinated Debt Fund, 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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 6 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Partners SD, 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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 7 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stamps, Woodsum & Co. III
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


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

        Massachusetts general partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>


- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 8 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Investors III, 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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 9 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        E. Roe Stamps, IV
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 10 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stephen G. Woodsum
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 11 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Gregory M. Avis
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 12 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Martin J. Mannion
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 13 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Bruce R. Evans
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 14 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Thomas S. Roberts
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 15 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Walter G. Kortschak
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 16 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Joseph F. Trustey
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,638,167 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,638,167 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,638,167 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        12.3%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 17 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Kevin P. Mohan
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,538,227 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,538,227 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,538,227 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        11.6%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    25500M10                    13G                 PAGE 18 OF 39 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Peter Y. Chung
- --------------------------------------------------------------------------------
  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 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                1,538,227 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                1,538,227 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,538,227 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        11.6%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

                                  Schedule 13G
                                  ------------

Item 1(a).        Name of Issuer:  Ditech Communications Corporation

Item 1(b).        Address of Issuer's Principal Executive Offices: 825 E.
                  Middlefield Road, Mountain View, CA 94043.

Item 2(a).        Names of Persons Filing: Summit Ventures IV, L.P., Summit
                  Partners IV, L.P., Stamps, Woodsum & Co. IV, Summit
                  Subordinated Debt Fund, L.P., Summit Partners SD, L.P, Stamps,
                  Woodsum & Co. III, Summit Investors III, L.P., and Messrs. E.
                  Roe Stamps, IV, Stephen G. Woodsum, Gregory M. Avis, Martin J.
                  Mannion, Bruce R. Evans, Thomas S. Roberts, Walter G.
                  Kortschak, Joseph F. Trustey, Kevin P. Mohan and Peter Y.
                  Chung.

                  Summit Partners IV, L.P. is the sole general partner of Summit
                  Ventures IV, L.P. Stamps, Woodsum & Co. IV is the sole general
                  partner of Summit Partners IV, L.P. Summit Partners SD, L.P.
                  is the sole general partner of Summit Subordinated Debt Fund,
                  L.P. Stamps, Woodsum & Co. III is the sole general partner of
                  Summit Partners SD, L.P. Messrs. Stamps, Woodsum, Avis,
                  Mannion, Evans, Roberts, Kortschak and Trustey are individual
                  general partners of Stamps, Woodsum & Co. III, Stamps, Woodsum
                  & Co. IV and Summit Investors III, L.P. Messrs. Mohan and
                  Chung are individual general partners of Stamps, Woodsum & Co.
                  IV and Summit Investors III, L.P.

Item 2(b).        Address of Principal Business Office or, if None, Residence:
                  The address of the principal business office of Summit
                  Ventures IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum &
                  Co. IV, L.P., Summit Subordinated Debt Fund, L.P., Summit
                  Partners SD, L.P., Stamps, Woodsum & Co. III, Summit Investors
                  III, L.P., and Messrs. Stamps, Woodsum, Mannion, Evans,
                  Roberts, Trustey, and Mohan is Summit Partners, 600 Atlantic
                  Avenue, Boston, Massachusetts 02210. The address of the
                  principal business office of Messrs. Avis, Kortschak and Chung
                  is Summit Partners, 499 Hamilton Avenue, Palo Alto, California
                  94301.

Item 2(c).        Citizenship: Each of Summit Ventures IV, L.P., Summit Partners
                  IV, L.P., Summit Subordinated Debt Fund, L.P., Summit Partners
                  SD, L.P., and Summit Investors III, L.P., is a limited
                  partnership organized under the laws of the State of Delaware.
                  Each of Stamps, Woodsum & Co. III and Stamps, Woodsum & Co. IV
                  is a general partnership organized under the laws of the
                  Commonwealth of Massachusetts. Each of Messrs. Stamps,
                  Woodsum, Avis, Mannion, Evans, Roberts, Kortschak, Trustey,
                  Mohan and Chung is a United States citizen.

Item 2(d).        Title of Class of Securities: Common Stock, $.001 par value
                  per share.

Item 2(e).        CUSIP Number:25500M10

                              Page 19 0f 39 Pages
<PAGE>

Item 3.           If this statement is filed pursuant to Rules 13d-1(b), or
                  13d-2(b), check whether the person filing is a:

                  Not Applicable

Item 4.           Ownership.
                  ---------

                  (a)   Amount Beneficially Owned:

                        Each of Summit Ventures IV, L.P., Summit Partners IV,
                        L.P., Stamps, Woodsum & Co. IV, L.P., Summit
                        Subordinated Debt Fund, L.P., Summit Partners SD, L.P.,
                        Stamps, Woodsum & Co. III, and Summit Investors III,
                        L.P., (individually an "Entity" and collectively the
                        "Entities") may be deemed to own beneficially 1,638,167
                        shares of Common Stock as of December 31, 1999. Each of
                        Messrs. Stamps, Woodsum, Avis, Mannion, Evans, Roberts,
                        Kortschak and Trustey may be deemed to own beneficially
                        1,638,167 shares of Common Stock as of December 31,
                        1999. Messrs. Mahon and Chung may be deemed to own
                        1,538,227 shares of Common Stock as of December 31,
                        1999.

                        As of December 31, 1999, Summit Ventures IV, L.P. was
                        the record owner of 1,488,984 shares of Common Stock. As
                        of December 31, 1999, Summit Subordinated Debt Fund,
                        L.P. was the record owner of 99,940 shares of Common
                        Stock. As of December 31, 1999, Summit Investors III,
                        L.P. was the record owner of 49,243 shares of Common
                        Stock. The shares held of record by Summit Ventures IV,
                        L.P., Summit Subordinated Debt Fund, L.P., and Summit
                        Investors 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
                        1,638,167 shares of Common Stock. In their capacities as
                        individual general partners of Stamps, Woodsum & Co.
                        III, Stamps, Woodsum & Co. IV, and Summit Investors III,
                        L.P., each of Messrs. Stamps, Woodsum, Avis, Mannion,
                        Evans, Roberts, Kortschak and Trustey may be deemed to
                        own beneficially 1,638,167 shares of Common Stock. In
                        their capacities as individual general partners of
                        Stamps, Woodsum & Co. IV and Summit Investors III, L.P.,
                        Messrs. Mohan and Chung may be deemed to own
                        beneficially 1,538,227 shares of Common Stock.

                        Each of the reporting persons expressly disclaims
                        beneficial ownership of any shares of Common Stock of
                        Ditech Communications Corporation, except in the case of
                        Summit Ventures IV, L.P., for the 1,488,984 shares which
                        it holds of record, in the case of Summit Subordinated
                        Debt Fund, L.P., for the 99,940 shares which it holds of
                        record and in the case of Summit Investors III, L.P.,
                        for the 49,243 shares which it holds of record.

                                Page 20 39 Pages
<PAGE>

                  (b)   Percent of Class:

                        Summit Ventures IV, L.P.:  12.3%
                        Summit Partners IV, L.P.:  12.3%
                        Stamps, Woodsum & Co. IV:  12.3%
                        Summit Subordinated Debt Fund, L.P.:  12.3%
                        Summit Partners SD, L.P.:  12.3%
                        Stamps, Woodsum & Co. III:  12.3%
                        Summit Investors III, L.P.:  12.3%
                        E. Roe Stamps, IV:  12.3%
                        Stephen G. Woodsum:  12.3%
                        Gregory M. Avis:  12.3%
                        Martin J. Mannion:  12.3%
                        Bruce R. Evans:  12.3%
                        Walter G. Kortschak:  12.3%
                        Thomas S. Roberts: 12.3%
                        Joseph F. Trustey:  12.3 %
                        Kevin P. Mohan: 11.6%
                        Peter Y. Chung: 11.6%

                        The foregoing percentages are calculated based on the
                        13,282,222 shares of Common Stock reported to be
                        outstanding in a Quarterly Report on Form 10-Q for
                        Ditech Communications Corporation for the quarterly
                        period ended October 31, 1999.

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

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

                               0 shares for each reporting person

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

                        Summit Ventures IV, L.P.:  1,638,167 shares
                        Summit Partners IV, L.P.:  1,638,167 shares
                        Stamps, Woodsum & Co. IV:  1,638,167 shares
                        Summit Subordinated Debt Fund, L.P.:  1,638,167 shares
                        Summit Partners SD, L.P.:  1,638,167 shares
                        Stamps, Woodsum & Co. III:  1,638,167 shares
                        Summit Investors III, L.P.: 1,638,167 shares
                        E. Roe Stamps, IV:  1,638,167 shares
                        Stephen G. Woodsum:  1,638,167 shares
                        Gregory M. Avis:  1,638,167 shares
                        Martin J. Mannion:  1,638,167 shares
                        Bruce R. Evans:  1,638,167 shares
                        Walter G. Kortschak:  1,638,167 shares

                              Page 21 of 39 Pages
<PAGE>

                        Thomas S. Roberts:  1,638,167 shares
                        Joseph F. Trustey:  1,638,167 shares
                        Kevin P. Mohan:  1,538,227 shares
                        Peter Y. Chung:  1,538,227 shares


                        (iii)  sole power to dispose or direct the disposition
                               of:

                               0 shares for each reporting person

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

                        Summit Ventures IV, L.P.:  1,638,167 shares
                        Summit Partners IV, L.P.:  1,638,167 shares
                        Stamps, Woodsum & Co. IV:  1,638,167 shares
                        Summit Subordinated Debt Fund, L.P.:  1,638,167 shares
                        Summit Partners SD, L.P.:  1,638,167 shares
                        Stamps, Woodsum & Co. III:  1,638,167 shares
                        Summit Investors III, L.P.:  1,638,167 shares
                        E. Roe Stamps, IV:  1,638,167 shares
                        Stephen G. Woodsum:  1,638,167 shares
                        Gregory M. Avis:  1,638,167 shares
                        Martin J. Mannion:  1,638,167 shares
                        Bruce R. Evans:  1,638,167 shares
                        Walter G. Kortschak:  1,638,167 shares
                        Thomas S. Roberts:  1,638,167 shares
                        Joseph F. Trustey:  1,638,167 shares
                        Kevin P. Mohan:  1,538,227 shares
                        Peter Y. Chung:  1,538,227 shares

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.

                              Page 22 of 39 Pages
<PAGE>

                  Not Applicable. The reporting persons expressly disclaim
                  membership in a "group" as defined in Rule 13d-1(b)(1)(ii)(J).

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 23 of 39 Pages
<PAGE>

                                   SIGNATURES
                                   ----------

      After reasonable inquiry and to the best of our 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 listed on Exhibit 1 hereto.
                    ---------

Dated:  February 11, 2000.

SUMMIT VENTURES IV, L.P.                        SUMMIT INVESTORS III, L.P.

By:   Summit Partners IV, L.P.                  By:            *
                                                      --------------------------
                                                      General Partner
By:   Stamps, Woodsum & Co. IV
                                                SUMMIT PARTNERS IV, L.P.
      By:                   *
              -----------------------
              E. Roe Stamps, IV                 By:   Stamps, Woodsum & Co. IV
              General Partner
                                                      By:        *
                                                          ----------------------
                                                          E. Roe Stamps, IV
                                                          General Partner
SUMMIT SUBORDINATED DEBT FUND, L.P.
                                                SUMMIT PARTNERS SD, L.P.
By:   Summit Partners SD, L.P.
                                                By:   Stamps, Woodsum & Co. III
By:   Stamps, Woodsum & Co. III
                                                      By:            *
                                                         -----------------------
      By:                   *                            E. Roe Stamps, IV
              -----------------------                    General Partner
              E. Roe Stamps, IV
              General Partner


STAMPS, WOODSUM & CO. IV                        STAMPS, WOODSUM & CO. III

By:                         *                   By:                  *
      -------------------------------------           --------------------------
      E. Roe Stamps, IV                               E. Roe Stamps, IV
      General Partner                                 General Partner

                            *                                        *
- -------------------------------------------     --------------------------------
E. Roe Stamps, IV                               Martin J. Mannion

                            *                                        *
- -------------------------------------------     --------------------------------
Stephen G. Woodsum                              Joseph F. Trustey

                            *                                        *
- -------------------------------------------     --------------------------------
Gregory M. Avis                                 Bruce R. Evans

                              Page 24 of 39 Pages
<PAGE>

                                                                     *
                                                --------------------------------
                                                Walter G. Kortschak

                                                                     *
                                                --------------------------------
                                                Thomas S. Roberts

                                                                     *
                                                --------------------------------
                                                Kevin P. Mohan

                                                                     *
                                                --------------------------------
                                                Peter Y. Chung


                                                *By:  /s/ Thomas F. Farb
                                                      --------------------------
                                                      Thomas F. Farb
                                                      Attorney-in-fact







* Pursuant to Powers of Attorney on file with the Commission, which Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.
                       ---------

<PAGE>


                              Page 25 of 39 Pages


                                                                      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 Ditech Communications Corporation.

      This agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

      EXECUTED this 11 day of February, 2000.

SUMMIT VENTURES IV, L.P.                        SUMMIT INVESTORS III, L.P.

By:   Summit Partners IV, L.P.                  By:            *
                                                      --------------------------
                                                      General Partner
By:   Stamps, Woodsum & Co. IV
                                                SUMMIT PARTNERS IV, L.P.
      By:                   *
              -----------------------
              E. Roe Stamps, IV                 By:   Stamps, Woodsum & Co. IV
              General Partner
                                                      By:        *
                                                          ----------------------
                                                          E. Roe Stamps, IV
                                                          General Partner
SUMMIT SUBORDINATED DEBT FUND, L.P.
                                                SUMMIT PARTNERS SD, L.P.
By:   Summit Partners SD, L.P.
                                                By:   Stamps, Woodsum & Co. III
By:   Stamps, Woodsum & Co. III
                                                      By:            *
                                                         -----------------------
      By:                   *                            E. Roe Stamps, IV
              -----------------------                    General Partner
              E. Roe Stamps, IV
              General Partner


STAMPS, WOODSUM & CO. IV                        STAMPS, WOODSUM & CO. III

By:                         *                   By:                  *
      -------------------------------------           --------------------------
      E. Roe Stamps, IV                               E. Roe Stamps, IV
      General Partner                                 General Partner


                              Page 26 of 39 Pages
<PAGE>

                            *                                        *
- -------------------------------------------     --------------------------------
E. Roe Stamps, IV                               Martin J. Mannion

                            *                                        *
- -------------------------------------------     --------------------------------
Stephen G. Woodsum                              Joseph F. Trustey

                            *                                        *
- -------------------------------------------     --------------------------------
Gregory M. Avis                                 Bruce R. Evans

                                                                     *
                                                --------------------------------
                                                Walter G. Kortschak

                                                                     *
                                                --------------------------------
                                                Thomas S. Roberts

                                                                     *
                                                --------------------------------
                                                Kevin P. Mohan

                                                                     *
                                                --------------------------------
                                                Peter Y. Chung


                                                *By:  /s/ Thomas F. Farb
                                                      --------------------------
                                                      Thomas F. Farb
                                                      Attorney-in-fact



* Pursuant to Powers of Attorney on file with the Commission, which Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.
                       ---------

                              Page 27 of 39 Pages


                                                                       EXHIBIT 2
                                                                       ---------

                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints each and any of E. Roe Stamps, IV,
Stephen G. Woodsum, Gregory M. Avis, Walter G. Kortschak and Thomas F. Farb 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
individually or on behalf of each or any of Summit Ventures, L.P., SP (1984),
L.P. (f/k/a Summit Partners, L.P.), Stamps, Woodsum & Co., Summit Partners'
Holdings, L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps,
Woodsum & Co. II, SV Eurofund C.V., SV International, L.P., Summit Investors,
L.P., Summit Investors II, L.P., Summit Investors III, L.P., Summit Ventures
III, L.P., Summit Partners III, L.P., Stamps, Woodsum & Co. III, Summit Ventures
IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co., IV, Summit
Subordinated Debt Fund, L.P., Summit Partners SD, L.P., Summit E-Tek Holdings,
LLC, SW Management Corp., Summit Partners, L.P., Summit Master Company, LLC,
Summit Subordinated Debt Fund II, L.P., Summit Partners SD II, LLC, Summit
Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V
Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P. and Summit V Companion
Fund, L.P., pursuant to sections 13 and 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, 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 she might or could do in person thereby ratifying and confirming all
that said attorney-in-fact and agent, or her substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.

                               Page 28 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ E. Roe Stamps, IV
                                                 -----------------------------
                                                 E. Roe Stamps, IV

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came E. Roe
Stamps, IV, known to me to be the person described and who executed the
foregoing instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------


                              Page 29 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Stephen G. Woodsum
                                                 -----------------------------
                                                 Stephen G. Woodsum

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Stephen G.
Woodsum, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------


                              Page 30 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Martin J. Mannion
                                                 -----------------------------
                                                 Martin J. Mannion

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Martin J.
Mannion, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 31 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
8th day of February, 2000.

                                                 /s/ Gregory M. Avis
                                                 -----------------------------
                                                 Gregory M. Avis

State of California                         )
                                            ) ss:
County of Santa Clara                       )

         On this 8th day of February, 2000, before me personally came Gregory M.
Avis, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------


                              Page 32 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                  /s/ Thomas S. Roberts
                                                 -----------------------------
                                                 Thomas S. Roberts

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Thomas S.
Roberts, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 33 of 39 Pages

<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Bruce R. Evans
                                                 -----------------------------
                                                 Bruce R. Evans

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Bruce R.
Evans, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]


                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------


                              Page 34 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
8th day of February, 2000.

                                                 /s/ Walter G. Kortschak
                                                 -----------------------------
                                                 Walter G. Kortschak

State of California                 )
                                    ) ss:
County of Santa Clara               )

         On this 8th day of February, 2000, before me personally came Walter G.
Kortschak, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 35 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Joseph F. Trustey
                                                 -----------------------------
                                                 Joseph F. Trustey

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Joseph F.
Trustey, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 36 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Kevin P. Mohan
                                                 -----------------------------
                                                 Kevin P. Mohan

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Kevin P.
Mohan, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 37 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
8th day of February, 2000.

                                                 /s/ Peter Y. Chung
                                                 -----------------------------
                                                 Peter Y. Chung

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 8th day of February, 2000, before me personally came Peter Y.
Chung, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------


                              Page 38 of 39 Pages
<PAGE>


         IN WITNESS WHEREOF, this Power of Attorney has been signed as of the
7th day of February, 2000.

                                                 /s/ Thomas F. Farb
                                                 -----------------------------
                                                 Thomas F. Farb

Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

         On this 7th day of February, 2000, before me personally came Thomas F.
Farb, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                                  /s/ Cynthia R. Freedman
                                                 -----------------------------
                                                 Notary Public

                                                 My Commission expires:
                                                 October 20, 2000
                                                 -----------------------------

                              Page 39 of 39 Pages


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