Patent ID: 8731035

Claim:
A cable modem in communication with a cable modem terminal system, comprising: a power amplifier; a processor; and a storage system storing one or more software programs in the form of computerized codes operable to be executed by the processor, the one or more software programs comprising: a ranging module that executes periodic ranging with the cable modem terminal system, and records a time point at which the periodic ranging is completed; a time obtaining module that obtains an un-ranging time interval during which the cable modem terminal system permits the cable modem not to execute periodic ranging with the cable modem terminal system, and sets a sleep time interval during which the cable modem does not execute periodic ranging with the cable modem terminal system according to the un-ranging time interval; and a power saving module that determines if the cable modem transmits packets during a preset time interval before the recorded time point, and shuts off the power amplifier in the sleep time interval if the cable modem does not transmit packets during the preset time interval before the recorded time point.