Exhibit 24
POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes
and appoints Michael C. Veysey, Angela M. Woo and JoAnn B. Buck the
undersigned's true and lawful attorneys-in-fact, with either of such
attorneys-in-fact having the power to unilaterally:

(1)	execute for and on behalf of the undersigned, in the undersigned's
capacity as an executive officer and/or director of Scientific-Atlanta,
Inc. ("Company"), Forms 3, 4, 5 and any other form promulgated under Section
16(a), in accordance with Section 16(a) of the Securities Exchange Act of
1934 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 and execute any such Form 3,
4 or 5 and timely file any such form with the United States Securities and
Exchange Commission and any stock exchange or similar 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, in 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 such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
necessary or proper to be done in the exercise of any of the rights and
powers herein granted, as fully as the undersigned might or could do if
personally present, with full power of substitution or revocation, hereby
ratifying and confirming all that each such attorney-in-fact, or each
such attorney-in-fact's 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 each foregoing
attorney-in-fact, by serving in such capacity at the
request of the undersigned, is 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.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 and 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 attorney-in-fact that the undersigned
desires to terminate.  I hereby revoke the previous Power of Attorney
issued to Patricia L. Van Gorder, Michael C. Veysey and Angela M. Woo
on June 24, 2004.  This Power of Attorney constitutes the entire
agreement with respect to the subject matter hereof.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed this 10th day of May, 2005.

/s/ Terence F. McGuirk
Terence F. McGuirk