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Method for fail-safe communication

  • US 8,228,946 B2
  • Filed: 07/29/2009
  • Issued: 07/24/2012
  • Est. Priority Date: 07/29/2009
  • Status: Active Grant
First Claim
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1. A method of operating a communication system, the communication system comprising a plurality of network nodes, the method comprising:

  • coupling the plurality of network nodes together using a dual-redundant Ethernet ring topology, wherein the dual-redundant Ethernet ring topology includes at least a first communication channel and a second communication channel;

    performing multiple-levels of loop-back testing including performing at least one of a protocol level loop-back test, a Media Access Controller (MAC) level loop-back test, a physical layer (PHY) level loop-back test, and an external loop-back test, and determining an interval between execution of the loop-back tests that balances between network safety and data stream throughput; and

    transmitting a network data packet upon receipt of a network token by a receiving network node, wherein the network token places the receiving network node in a transmitter mode.

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