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Synchronization of distributed cable modem network components

  • US 20060056460A1
  • Filed: 01/06/2005
  • Published: 03/16/2006
  • Est. Priority Date: 09/14/2004
  • Status: Active Grant
First Claim
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1. A method for synchronizing operation of distributed cable modem termination system components, the method comprising:

  • transmitting a plurality of data packets from a head end to a downstream transmitter hub via a packet data network, each data packet marked with a measured delay Quality of Service (QoS) indicator and including a time stamp based upon a clock of the head end and a delay tag;

    receiving the plurality of data packets at the downstream transmitter hub;

    smoothing, by the downstream transmitter hub, the time stamps of the plurality of data packets based upon corresponding delay tags;

    based upon the smoothed time stamps, synchronizing a clock of the downstream transmitter hub with the clock of the head end; and

    synchronizing a clock of an upstream receiver hub with the clock of the downstream transmitter hub.

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