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Time division exchange for carrying out a loop-back test

  • US 4,688,208 A
  • Filed: 08/12/1985
  • Issued: 08/18/1987
  • Est. Priority Date: 08/15/1984
  • Status: Expired due to Fees
First Claim
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1. A time division exchange for serving plural lines, comprising:

  • a network, coupled to the lines, for transmitting and receiving time division multiplexed signals;

    a time division multiplexed trunk, coupled to said network, for providing, as an output time division multiplexed signal to another exchange, the time division multiplexed signal transmitted by said network, and for providing an input time division multiplexed signal to said network as the received time division multiplexed signal, said time division multiplexed trunk including means for interchanging predetermined time slots in one of the time division multiplexed signals when a loop-back test is to be performed; and

    return means, coupled to said time division multiplexed trunk, for receiving the output time division multiplexed signal and for returning it to said time division multiplexed trunk, as the input time division multiplexed signal, during the loop-back test.

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