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Fast and reliable data carrier detection by a cable modem in a cable television plant

  • US 6,574,796 B1
  • Filed: 01/08/1999
  • Issued: 06/03/2003
  • Est. Priority Date: 01/08/1999
  • Status: Expired due to Term
First Claim
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1. A method of detecting a data carrier in a downstream band in a cable television plant, the method comprising:

  • (a) selecting a potential data carrier from within the downstream band;

    (b) determining whether the potential data carrier contains a signal modulated according to a first modulation scheme wherein the first modulation scheme is not a default modulation scheme used on signals in the downstream band; and

    (c) if the potential data carrier contains a signal that is apparently not modulated according to the first modulation scheme, determining whether the potential data carrier contains a signal modulated according to a second modulation scheme wherein the second modulation scheme is the default modulation scheme used on signals in the downstream band;

    whereby the determination in step (b) can be made rapidly.

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