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Local area network with fault detection and recovery

  • US 5,390,326 A
  • Filed: 04/30/1993
  • Issued: 02/14/1995
  • Est. Priority Date: 04/30/1993
  • Status: Expired due to Term
First Claim
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1. In a local area network having (i) a token bus formed of redundant cables and (ii) a plurality of modules connected to the token bus, a method of detecting and recovering from faults comprising the steps of:

  • with each module, periodically transmitting heartbeat signals on each redundant cable of the token bus at a predetermined periodic rate;

    with each module, monitoring the periodic heartbeat signals on each redundant cable of the token bus, each module being adapted to receive on each of said cables every periodic heartbeat signal from other modules connected to the token bus;

    indicating a fault when the heartbeat signals fail to be received at the predetermined periodic rate; and

    initiating a fault recovery action.

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