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Method of and apparatus for checking datapath failure in a communication muldem

  • US 4,601,028 A
  • Filed: 06/18/1984
  • Issued: 07/15/1986
  • Est. Priority Date: 06/18/1984
  • Status: Expired due to Term
First Claim
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1. Testing apparatus of the class described comprising, in combination:

  • high speed to low speed muldem apparatus comprising a plurality of multiplex-demultiplex modules where each of the modules interfaces between a common frequency and, depending on the application, one of either a customer low speed frequency or a high speed line frequency;

    bit by bit comparator apparatus connected to each of said modules for testing the module by comparing data input to the module at the common frequency with data output by the module and returned through other datapaths where it is returned to the common frequency and checked for identity of logic value with the data input;

    means for directing typical transmission line data to a module to be tested for operability and to said comparator apparatus; and

    means for providing a return datapath connection, including reconversion means to said common frequency, for the non-common frequency terminals of said module to be tested to said comparator means for the bit by bit comparison testing.

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