Patent ID: 6772437
Filing Date: 2004-08-03
Classification: H04N

Abstract:
A self-testing cable modem for testing a cable network, the self-testing cable modem comprising:a media access controller coupled to a cable network, the cable network having a downstream side to the cable modem and an upstream side from the cable modem; a processor coupled to the media access controller; and a host interface coupled to a host system; a signal power measurement circuit responsive to an upstream side of the cable network, the signal power measurement circuit comprising: a bandpass filter having a selectable center frequency having an input side coupled to the upstream side of the cable network; a power detector coupled to an output side of the bandpass filter; and wherein the selectable center frequency is selectable responsive to the processor and wherein the processor is configured to receive commands over the cable network specifying a desired center frequency for power measurements and wherein the power detector is a power integrator.