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Timestamp-based timing recovery for cable modem media access controller

  • US 6,698,022 B1
  • Filed: 12/15/1999
  • Issued: 02/24/2004
  • Est. Priority Date: 12/15/1999
  • Status: Expired due to Term
First Claim
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1. A method for employing timestamps received by a media access controller of a cable modem from a cable modem termination system to schedule upstream transmissions of the cable modem, the method comprising the steps of:

  • storing at least one timestamp and a corresponding count of a first local clock counter in a memory;

    loading a first timestamp of said at least one timestamp in a second local clock counter;

    computing a first and second adjustment values based on the at least one timestamp stored in the memory and outputs of the first and second local clock counters; and

    adjusting the second local clock counter by the first and second adjustment values.

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