Synchronization of distributed cable modem network components

Details Synchronization of distributed cable modem network components Synchronization of distributed cable modem network components

Filed on

2005-01-06

Date issued

2009-12-08

Examiner

Ngo, Ricky (Department: 2416)

Patent Class

Multiplex communications

SubClass

Communication over free space

SubSubClass

Combining or distributing information via time channels

Other Related Categories

C370S335000, C370S490000, C370S503000, C375S219000, C709S223000, C713S400000, C725S111000

Type

Reexamination Certificate

Status

active

Patent number

07630357

Description

ABSTRACT:
A distributed CMTS includes a head end, a downstream transmitter hub, and an upstream receiver hub. The head end transmits data packets to the downstream transmitter via a coupling packet data network. Each data packet is marked with a “measured delay” Quality of Service (QOS) and includes a time stamp that is based upon a clock of the head end and a delay tag. The downstream transmitter hub receives the plurality of data, adjusts the time stamps based upon the delay tags, smoothes the time stamps of the plurality of data packets and, based upon the smoothed time stamps, synchronizes its clock with the clock of the head end. The downstream transmitter hub then synchronizes a clock of the upstream receiver hub with the clock of the downstream transmitter hub. The upstream receiver hub may synchronize its clock to the clock of the head end using this technique.

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