Patent ID: 7203227
Filing Date: 2007-04-10
Classification: H04L

Abstract:
1. A Cable Modem (CM), comprising: an upstream transmitter that is operable to transmit data upstream to a Cable Modem Termination System (CMTS) via a cable modem network segment, the upstream transmitter having a physical interface that includes a modulo Numerically Controlled Oscillator (NCO) that produces an upstream baud rate clock; a downstream receiver that is operable to receive data transmitted downstream by the CMTS via the cable modem network segment, the downstream receiver having a physical interface that includes a timing loop filter; wherein the timing loop filter of the downstream receiver generates an estimate of a downstream symbol clock that corresponds to data transmitted downstream from the CMTS to the CM and, based thereupon, generates a downstream timing Frequency Control Word (FCW) that corresponds to the estimate of the downstream symbol clock; wherein the downstream receiver scales the downstream timing FCW to generate an upstream timing FCW; and wherein the modulo NCO receives the upstream timing FCW and generates the upstream baud rate clock based thereupon.