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Cable television master/slave decoder control

  • US 4,633,309 A
  • Filed: 05/06/1985
  • Issued: 12/30/1986
  • Est. Priority Date: 05/06/1985
  • Status: Expired due to Term
First Claim
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1. A method of controlling the operation of slave decoders in a cable TV distribution system having a central control computer;

  • in which each subscriber location having a slave decoder also has a master decoder;

    in which there is a control message connection between each master decoder and its associated slave decoder(s); and

    in which the central control computer can address each master decoder and each slave decoder, including the step of periodically sending from the central control computer a deauthorization message for all slave decoders, which message is preceded by an inhibit message directed to all master decoders, which inhibit message prevents the receipt of the deauthorize message by all slave decoders which are connected, by a control message connection, with a master decoder.

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