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

SCHEDULE 13G
(Amendment No. 1)*

Under the Securities Exchange Act of 1934

BIGBAND NETWORKS, INC.
(Name of Issuer)

Common Stock, par value $0.001 per share
(Title of Class of Securities)

089750509
(CUSIP Number)

December 31, 2009
(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
13G 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). 

CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Charles River Partnership XI, LP

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [X]
 (b) [ ]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Delaware
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): OO
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Charles River Friends XI-A, LP

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [X]
 (b) [ ]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Delaware
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): OO
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Charles River Friends XI-B, LP

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [X]
 (b) [ ]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Delaware
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): OO
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Charles River XI GP, LP

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Delaware
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): OO
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Charles River XI GP, LLC

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Delaware
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): OO
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Izhar Armony

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: Israel
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Christopher Baldwin

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Richard M. Burnes, Jr.

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Ted R. Dintersmith

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Bruce I. Sachs

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 William P. Tai

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509
--------------------------------------------------------------------------------

(1) Names of Reporting Persons. I.R.S. Identification Nos. of Above Persons
 (entities only):

 Michael J. Zak

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

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
 (a) [ ]
 (b) [X]
--------------------------------------------------------------------------------

(3) SEC Use Only
--------------------------------------------------------------------------------

(4) Citizenship or Place of Organization: United States
--------------------------------------------------------------------------------
Number of Shares Beneficially Owned
 by Each Reporting Person With (5) Sole Voting Power: 0*
 --------------------------------------
 (6) Shared Voting Power: 3,793,991*
 --------------------------------------
 (7) Sole Dispositive Power: 0*
 --------------------------------------
 (8) Shared Dispositive Power: 3,793,991*
 --------------------------------------
--------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person:

 3,793,991*
--------------------------------------------------------------------------------

(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
 Instructions): N/A
--------------------------------------------------------------------------------

(11) Percent of Class Represented by Amount in Row (9): 5.7%*
--------------------------------------------------------------------------------

(12) Type of Reporting Person (See Instructions): IN
--------------------------------------------------------------------------------
*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the
"Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the
"Company"), outstanding as of November 1, 2009, as disclosed in the Company's
Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009.
Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles
River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of
Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP
("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership
XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes,
Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a
managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively,
the "Partnerships") form a "group" for purposes of Section 13(d) of the
Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships
collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares
of the Common Stock deemed issued and outstanding as of that date. For the
purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR
XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs,
Tai, and Zak (collectively, the "Management Persons") may be deemed to
beneficially own the securities owned by the Partnerships. Accordingly, as of
December 31, 2009, the Management Persons may be deemed to beneficially own
3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common
Stock deemed issued and outstanding as of that date. Each of the Management
Persons disclaims beneficial ownership of the securities reported herein held by
the Partnerships, except to the extent of such person's pecuniary interest in
each applicable Partnership, if any.


CUSIP No. 089750509

Item 1(a). Name Of Issuer: BigBand Networks, Inc.

Item 1(b). Address of Issuer's Principal Executive Offices:

 200 Crossing Boulevard, Framingham, MA 01702


Item 2(a). Name of Person Filing:

 Charles River Partnership XI, LP

 This Schedule 13G is also filed on behalf of Charles River XI GP, LLC
 ("CR XI GP LLC"), Charles River XI GP, LP ("CR XI GP LP"), Charles
 River Friends XI-A, LP ("CRF XI-A"), Charles River Friends XI-B, LP
 ("CRF XI-B"), Izhar Armony, Christopher Baldwin, Richard M. Burnes,
 Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael
 J. Zak. CR XI GP LLC is the general partner of CR XI GP LP. CR XI GP
 LLC is also the general partner of CRF XI-A and CRF XI-B. CR XI GP LP
 is the General partner of Charles River Partnership XI, LP. Each of
 Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs, Tai, and Zak is a
 managing member of CR XI GP LLC. Information related to each of CR XI
 GP LLC, CR XI GP LP, CRF XI-A, CRF XI-B, and Messrs. Armony, Baldwin,
 Burnes, Dintersmith, Sachs, Tai, and Zak is set forth on Appendix A
 hereto.


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

 c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300, Waltham, MA 02451

Item 2(c). Citizenship:

 Delaware

Item 2(d). Title of Class of Securities: Common Stock, par value $0.001 per
 share


Item 2(e). CUSIP No.: 089750509


Item 3. If This Statement Is Filed Pursuant to Sections 240.13d-1(b) or
 240.13d-2(b) or (c), check whether the Person Filing is a:

 Not Applicable.


Item 4. Ownership

 (a) Amount Beneficially Owned(as of December 31, 2009): 3,793,991*

 (b) Percent of Class(as of December 31, 2009): 5.7%*

 (c) Number of Shares as to which the person has:

 (i) sole power to vote or to direct the vote 0*

 (ii) shared power to vote or to direct the vote 3,793,991*

 (iii) sole power to dispose or to direct the
 disposition of 0*

 (iv) shared power to dispose or to direct the
 disposition of 3,793,991*


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 or Control Person

Not Applicable (See Item 2(a)).

Item 8. Identification and Classification of Members of the Group

Charles River Partnership XI, LP, Charles River Friends XI-A, LP, Charles River Friends XI-B, LP.

Item 9. Notice of Dissolution of Group

Not Applicable.

Item 10. Certification

This certification is not required as the filing person is filing pursuant to Rule 13d-1(d).

*Based on 66,425,618 shares of the common stock, par value $0.001 per share (the "Common Stock"), of BigBand Networks, Inc., a Delaware corporation (the "Company"), outstanding as of November 1, 2009, as disclosed in the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2009. Charles River XI GP, LLC ("CR XI GP LLC") is the general partner of Charles River XI GP, LP ("CR XI GP LP"). CR XI GP LLC is also the general partner of Charles River Friends XI-A, LP ("CRF XI-A") and Charles River Friends XI-B, LP ("CRF XI-B"). CR XI GP LP is the general partner of Charles River Partnership XI, LP ("CRP XI"). Each of Izhar Armony, Christopher Baldwin, Richard M. Burnes, Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and Michael J. Zak is a managing member of CR XI GP LLC. CRP XI, CRF XI-A and CRF XI-B (collectively, the "Partnerships") form a "group" for purposes of Section 13(d) of the Securities Exchange Act of 1934. As of December 31, 2009, the Partnerships collectively owned 3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common Stock deemed issued and outstanding as of that date. For the purposes of Rule 13d-3 under the Securities Exchange Act of 1934, as amended, CR XI GP LLC, CR XI GP LP, and Messrs. Armony, Baldwin, Burnes, Dintersmith, Sachs, Tai, and Zak (collectively, the "Management Persons") may be deemed to beneficially own the securities owned by the Partnerships. Accordingly, as of December 31, 2009, the Management Persons may be deemed to beneficially own 3,793,991 shares of the Common Stock, or 5.7% of those shares of the Common Stock deemed issued and outstanding as of that date. Each of the Management Persons disclaims beneficial ownership of the securities reported herein held by the Partnerships, except to the extent of such person's pecuniary interest in each applicable Partnership, if any.
SIGNATURE

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

January 14, 2010 

/s/ Sarah Reed
--------------------------------------
Sarah Reed as attorney-in-fact for
Charles River XI GP, LLC, general
partner of Charles River XI GP, LP,
general partner of Charles River
Partnership XI, LP

Attention: Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001) 

CUSIP No. 089750509

 APPENDIX A


A. Name: Charles River Friends XI-A, LP

 Address of Principal: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Place of
 Organization: Delaware


B. Name: Charles River Friends XI-B, LP

 Address of Principal: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Place of
 Organization: Delaware


C. Name: Charles River XI GP, LP

 Address of Principal: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Citizenship: Delaware


D. Name: Charles River XI GP, LLC

 Address of Principal: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Citizenship: Delaware


E. Name: Izhar Armony

 Address of Principal
 Business Office: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: Israel


F. Name: Christopher Baldwin

 Address of Principal
 Business Office: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


G. Name: Richard M. Burnes, Jr.

 Address of Principal
 Business Office: c/o Charles River XI GP, LLC
 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


H. Name: Ted R. Dintersmith

 Business c/o Charles River XI GP, LLC
 Address: 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


I. Name: Bruce I. Sachs

 Business c/o Charles River XI GP, LLC
 Address: 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


J. Name: William P. Tai

 Business c/o Charles River XI GP, LLC
 Address: 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


K. Name: Michael J. Zak

 Business c/o Charles River XI GP, LLC
 Address: 1000 Winter Street, Suite 3300
 Waltham, MA 02451

 Principal Managing Member of Charles River XI GP, LLC
 Occupation:

 Citizenship: United States


CUSIP No. 089750509

Each of Charles River XI GP, LLC, Charles River XI GP, LP, Charles River Friends
XI-A, LP, Charles River Friends XI-B, LP, Izhar Armony, Christopher Baldwin,
Richard M. Burnes, Jr., Ted R. Dintersmith, Bruce I. Sachs, William P. Tai, and
Michael J. Zak hereby agree, by their execution below, that the Schedule 13G
Amendment No. 1 to which this Appendix A is attached is filed on behalf of each
of them, respectively.



/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Charles River XI GP, LLC, general partner of
Charles River Friends XI-A, LP


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Charles River XI GP, LLC, general partner of
Charles RiverFriends XI-B, LP


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Charles River XI GP, LLC, general partner of
Charles River XI GP, LP


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Charles River XI GP, LLC


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Izhar Armony


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Christopher Baldwin


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Richard M. Burnes, Jr.


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Ted R. Dintersmith


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Bruce I. Sachs


/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
William P. Tai

/s/ Sarah Reed
--------------------------------- January 14, 2010
Sarah Reed as attorney-in-fact for
Michael J. Zak

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