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FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
Rooney Sean Padraic

(Last)(First)(Middle)
C/O BIGBAND NETWORKS, INC., 475 BROADWAY STREET

(Street)
REDWOOD CITYCA94063

(City)(State)(Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
08/12/2009
3. Issuer Name and Ticker or Trading Symbol
BigBand Networks, Inc. [BBND]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Senior VP of Worldwide Sales
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)4. Conversion or Excercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Employee Stock Option (right to buy)  (1)08/11/2019 Common Stock 250,000 $ 3.9 D  
Explanation of Responses:
1. The option vests at the rate of 25% of the shares subject to the option on the first anniversary of the date of grant, and 1/48th of the shares subject to the option each month thereafter, subject to the reporting person's continued service to the company.
/s/ Sean Padraic Rooney by Julia Dumperth, Attorney-in-Fact08/24/2009
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

BIGBAND NETWORKS, INC.
LIMITED POWER OF ATTORNEY -
SECURITIES LAW COMPLIANCE


The undersigned hereby constitutes and appoints each of Julia Dumperth, Robert
Horton, Bryce Steeg and/or Phuong Quinby, signing singly, his true and lawful
attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer and/or director of BigBand Networks, Inc. (the "Company"), Form
ID, Form 3, Form 4 and Form 5 (including any amendments thereto) in accordance
with Section 16(a) of the Securities Exchange Act of 1934, as amended, and the
rules thereunder;

(2) do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete the execution of any such Form ID,
Form 3, Form 4 and Form 5 and the timely filing of any such form with the United
States Securities and Exchange Commission and any other authority; and

(3) take any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit to,
to the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in fact on behalf of the
undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in fact may approve in his or
her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform all and every act and thing whatsoever requisite,
necessary and proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or his or her
substitute or substitutes, shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers herein granted. 

The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934, as amended.
This Limited Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Form ID, Form 3, Form 4 and Form 5
with respect to the undersigned's holdings of and transactions in securities
issued by the Company, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 13th day of August 2009.

By:/s/ Sean P. Rooney
Sean P. Rooney


INDIVIDUAL ACKNOWLEDGEMENT

STATE OF MASSACHUSETTS
COUNTY OF WORCESTER        

On this 13th day of August, 2009, before me, Sean Rooney personally appeared,
who proved to me on basis of satisfactory evidence to be the same person whose
name is subscribed to the within instrument and acknowledged to me that he
executed the same in his authorized capacity, and that by his signature on the
instrument is the person, or the entity upon behalf of which the person acted,
executed the instrument.

I certify UNDER PENALTY OF PERJURY under the laws of the State of Massachusetts
that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

/s/ Paulette M. Nicoltello
Notary Public/Commissioner of Oaths

My Commission expires June 18, 2015.

 

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