Multiplex communications – Channel assignment techniques
Reexamination Certificate
2011-03-29
2011-03-29
Shah, Chirag G (Department: 2477)
Multiplex communications
Channel assignment techniques
C370S503000, C725S117000
Reexamination Certificate
active
07916744
ABSTRACT:
A predetermined current frequency is selected for a cable modem or embedded media terminal adapter to evaluate for presence of a CMTS signal. A determination is made whether the current frequency carries signal energy as opposed to just noise. If no signal energy is detected, the current frequency is changed by ½ of a channel width to a new frequency, which becomes the current frequency, and the determination is re-performed. If the determination of the current frequency indicates that signal energy is present, but not CMTS energy, then a new frequency indicates that selected that differs from the current frequency by 1 MHz. If the determination at the current frequency indicates that CMTS signal energy is present, but QAM lock cannot be achieved, then a new frequency is selected by changing from the current frequency by a full channel width.
REFERENCES:
patent: 2002/0083465 (2002-06-01), Van Beek
patent: 2002/0157106 (2002-10-01), Uskali et al.
patent: 2005/0075125 (2005-04-01), Bada et al.
patent: 2006/0225109 (2006-10-01), Seo
patent: 2007/0287377 (2007-12-01), Eck
ARRIS Group, Inc.
Reddivalam Srinivasa R
Shah Chirag G
Starr Robert J.
Van Aacken Troy A.
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