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Media access layer ping protocol for diagnosing cable modem links

  • US 7,227,889 B1
  • Filed: 04/24/2003
  • Issued: 06/05/2007
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Term
First Claim
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1. An apparatus of examining connectivity status between a cable modem termination system (CMTS) and one or more cable modems, the apparatus comprising:

  • means for receiving a network command that causes the CMTS to place a selected identifier associated with a cable modem into a poll list a predetermined number of times thereby causing the cable modem to receive a map message the predetermined number of times;

    means for performing periodic ranging between the CMTS and a cable modem associated with the selected identifier;

    means for, if the selected identifier is in the poll list as a result of the network command, evaluating results from the periodic ranging; and

    means for determining whether the cable modem should remain on the poll list based on the results from the periodic ranging.

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