H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/22 (2006.01) G08C 17/00 (2006.01) H04B 1/38 (2006.01) H04B 3/00 (2006.01) H04B 3/02 (2006.01) H04B 15/00 (2006.01) H04M 11/00 (2006.01)
Patent
CA 2286541
To reduce power consumption and associated heating in a line card of line termination equipment (LTE, 12) employing multiple sub-channel carriers to communicate broadband information to customer premise equipment (CPE, 30) down a wireline communication resource (26), sub-channel carrier transmissions are restricted (58) during periods of CPE inactivity. Power supplies to a power amplifier (30) associated with the line card and wireline resource (26) are reduced, with digital signal processing capabilities of the LTE (12) further restricted (64). When the CPE wishes to re-start communication, the CPE (30) locks (68) to a correct alignment in a transmission scheme using a pilot tone that is transmitted within a simple pattern sent during reduced sub-channel carrier transmissions. Alternatively, should all transmission from the LTE cease during CPE inactivity, then the CPE monitors (80) the transmission environment and sends (82) a wake-up call to the LTE between boundaries of an uplink slot. The LTE (12) re-establishes pilot tone transmissions (86), with synchronisation and lock (88) subsequently achievable by the CPE (30); this is illustrated in FIG. 2.
Grant Mike Francis
Tate Christopher Neville
Wallace Andrew David
Nortel Networks Corporation
Nortel Networks Limited
Smart & Biggar
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