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Apparatus and method for timing distribution over an asynchronous ring

  • US 5,206,857 A
  • Filed: 04/29/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 04/29/1991
  • Status: Expired due to Term
First Claim
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1. A communication network interconnecting a master node and at least one slave node in a ring topology, each node including a clock for providing timing signals to equipment at that node, each node further including means for transmitting and receiving data to and from the ring network,characterized in that:

  • the master node includes;

    means responsive to the clock at the master node for measuring a first time delay encountered by data traversing the ring network;

    means for transmitting the measure of the first time delay to the slave node,the slave node includes;

    means responsive to the clock at the slave node for measuring a second time delay encountered by data traversing the ring network;

    means for receiving the measure of the first time delay from the master node; and

    means responsive to the difference between the measured first and second time delays for adjusting the frequency of the clock at the slave node to bring its frequency into a predetermined relationship with the frequency of the clock at the master node.

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