Stable low power mode for multicarrier transceivers

Abstract

A stable Low Power Mode (LPM) for multicarrier transceivers is described that at least provides transmit power savings while enabling receiver designs that can easily operate without the detrimental effects of fluctuating crosstalk. In one exemplary embodiment, the LPM achieves power savings by reducing the number of used subcarriers without actually performing a power cutback on those subcarriers, thereby allowing a receiver to measure the SNR or noise levels and determine the crosstalk noise on the line regardless of a crosstalking modem being in a LPM or not.

1 . A communications system comprising:
 a first transceiver; and   a second transceiver operatively coupled to the first transceiver, wherein, during a low power mode, only a subset of subcarriers transmitted in a full power mode are transmitted, and the subset of carriers is transmitted at a same power level as in the full power mode.   
     
     
         2 - 74 . (canceled) 
     
     
         75 . A transceiver capable of stable low power mode operation. 
     
     
         76 . A transceiver having a low power mode.