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Selective signalling encoder/decoder for multipoint data communication networks

  • US 4,815,105 A
  • Filed: 04/07/1987
  • Issued: 03/21/1989
  • Est. Priority Date: 04/07/1987
  • Status: Expired due to Term
First Claim
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1. A system for selective signaling in a multipoint data communications network comprising:

  • a master unit of digital communications equipment;

    a plurality of slave units in communication with said master unit wherein a portion of said slave units have means responsive to a standard training sequence from said master unit and wherein a portion of said slave units do not have means responsive to a standard training sequence from said master unit;

    means for transmitting a standard training sequence format from said master unit of digital communications equipment to said plurality of slave units;

    means for interrupting said standard training sequence format to transmit the address of a particular slave unit and a message,;

    means for appending said message with a sufficient number of marks to establish a common starting point for said slave units thereby maintaining compatibility with said slave units not having said sequence responsive means;

    means for sensing said address at said particular slave unit whereby only said particular slave unit responds to said master unit during a subsequent transmission from said master unit.

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