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Method and system for diagnosing a fault or open circuit in a network

  • US 8,699,356 B2
  • Filed: 05/03/2011
  • Issued: 04/15/2014
  • Est. Priority Date: 12/20/2010
  • Status: Active Grant
First Claim
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1. A method for diagnosing a fault or open circuit in a network, the method comprising:

  • operating a data bus of a network that has a normal high logic level and a normal low logic level consistent with a termination circuit signal applied by one or more network elements of the network;

    injecting a test signal into the data bus of the network during a test time period, the test signal having at least one of a greater logic level greater than the normal high logic level of the data bus or a lower logic level lower than the normal low logic level of the data bus;

    during the test time period, sensing an aggregate level of an aggregate signal on the data bus, the aggregate signal composed of the termination circuit signal and the test signal; and

    determining whether a faulty connection between the data bus and a network device exists, where a faulty connection results in the sensed aggregate level exceeding at least one of the normal high logic level and the normal low logic level.

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