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Communications system

  • US 4,811,365 A
  • Filed: 11/07/1986
  • Issued: 03/07/1989
  • Est. Priority Date: 11/07/1986
  • Status: Expired due to Term
First Claim
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1. In a communications system wherein a plurality of nodes transmit over a common path on a time sharing basis, the method for permitting closer spacing of the communications from the nodes on the path comprising the steps of:

  • (a) designating one of the nodes as the reference node and the remaining nodes as slave nodes;

    (b) beginning a transmission sequence by having the reference node transmit a repeating, pre-established, pseudo-random, digital sequence at a pre-established bit rate;

    (c) having the reference node continue its sequence while omitting a portion thereof between the start and end of the sequence;

    (d) having a slave node preparing join the transmission sequence begin the same repeating, pre-established, pseudo-random, digital sequence at approximately the same pre-established bit rate;

    (e) having the slave node transmit an approximation of the portion of the sequence being omitted by the reference node;

    (f) adjusting the bit rate, phasing, framing and sequence portion of the transmission from the slave node until the portion being transmitted thereby exactly matches the portion being omitted by the reference node whereby the reference node and slave node are placed in precise synchronization;

    (g) having the slave node inform the reference node that it is in synchronization and ready to begin normal message transmission; and

    ,(h) beginning normal message transmission by the reference and slave nodes.

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