Patent ID: 8375415
Filing Date: 2013-02-12
Classification: H04L,H04N,Y02D

Abstract:
1. A cable modem for receiving down stream and transmitting upstream communication signals to a cable network having an upstream power control system for controlling power consumption comprising; a MAC chip for synchronizing upstream communication signals, and outputting an upstream control signal; an upstream amplifier for receiving synchronized upstream communication signals from said MAC chip; and a complex programmable logic device (CPLD), coupled to said MAC chip and said upstream amplifier, which controls said upstream amplifier in response to the upstream control signal from said MAC chip, such that said CPLD causes said upstream amplifier to power on during transmission of upstream signals and power off when not transmitting said upstream signals, thereby reducing power consumption of the cable modem, wherein said CPLD generates an amplifier switch signal for connecting said upstream amplifier to an RF tuner for transmission of said upstream data signal to said headend, and an amplifier control signal for powering on and off said upstream amplifier, and wherein said CPLD generates said amplifier switch signal after said amplifier control signal is generated, thereby stabilizing said upstream amplifier.