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Control of access through local carrier sensing for high data rate networks and control of access of synchronous messages through circulating reservation packets

  • US 5,229,993 A
  • Filed: 02/25/1991
  • Issued: 07/20/1993
  • Est. Priority Date: 02/25/1991
  • Status: Expired due to Fees
First Claim
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1. In a ring or unidirectional bus network having a plurality of nodes to which are connected a plurality of computer stations, a method for efficiently transmitting data on said network allowing multiple messages on the network simultaneously, said method being performed by control logic at each of said nodes and comprising the steps of:

  • sensing a carrier on said network to detect the presence of incoming data at the node;

    if the incoming data is addressed to the node, receiving the data and removing it from said network;

    if the data is not addressed to the node, retransmitting the data with fixed delay;

    if the node is transmitting data at the time of receipt of incoming data and the incoming data is not addressed to the node, truncating the data being transmitted and retransmitting the incoming data;

    if transmitting data at the time of receipt of incoming data addressed to the node, continuing to transmit data while receiving data.

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