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Subscriber loop tester for telephone switching systems

  • US 5,208,846 A
  • Filed: 09/03/1991
  • Issued: 05/04/1993
  • Est. Priority Date: 09/03/1991
  • Status: Expired due to Term
First Claim
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1. A subscriber loop tester for transmitting outgoing telecommunications signals to and receiving incoming telecommunications signals from telephone switching systems implementing different data line codes and protocols and telecommunications standards comprising:

  • a partitioned "U" interface having a high impedance transformer coupled to receive the telecommunications signals and meeting the bandwidth and line matching requirements for different line codes and protocols implemented in an ISDN telecommunications system;

    a plurality of circuits selectively coupled to receive the telecommunications signals from the high impedance transformer with each circuit having AC and DC terminations matching a specific line code and protocol and programmable attenuators for producing a proper nominal signal level as a function of the specific line code and protocol and providing variable insertion loss, the terminations and attenuators being coupled to a transceiver circuit for generating an output having a specific data format;

    a digital bus translator for converting the specific data formats of the various transceiver circuits on the plurality of circuits to a common data format;

    a high speed bus for coupling the output of the transceiver circuits on the plurality of circuits to the digital bus controller, the high speed bus being selectively coupled to each of the plurality of circuits and selectively configured by the digital bus translator for the specific data format of the transceiver circuit; and

    means for controlling source and destination audio paths for voice telecommunications signals within the subscriber loop tester

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