Methods and apparatus for determining transmission power levels

Details Methods and apparatus for determining transmission power levels Methods and apparatus for determining transmission power levels

2007-05-22

2007-05-22

Kim, Kevin (Department: 2611)

Pulse or digital communications

Cable systems and components

C375S222000, C725S111000

Reexamination Certificate

active

10016032

ABSTRACT:
Methods and apparatus are provided for determining transmission power levels. The power characteristics of a cable modem family are determined by testing cable modems in a cable modem family with various downstream frequencies and transmission power levels to determine internal gain levels. The power characteristics of the cable modem family can then be stored in an efficient manner in each cable modem by using interpolation. The individual cable modem can then be characterized by testing the cable modem with a limited set of downstream frequencies and transmission power levels to determine an internal gain level offset for that particular cable modem. With the power characteristics table, internal gain level offset, and interpolation, transmission power levels can be determined during network operation when downstream frequencies and internal gain levels are known.

REFERENCES:
patent: 2004/0087288 (2004-05-01), Lapid
“Cable Modem Diagnostics and Signal Levls” www.homepage.ntlworld.com/robin.d.h.walker/cmtips/signal.html downloaded May 20, 200517 pages.
Wonglumstom et al, “Experimental Demonstration of an Access Point for HORNET—A Packet Over WDM Multiple Access MAN”, Journal of Lightwave Technology, vol. 18, No. 12, Dec. 2000, pp. 1709-1717.

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