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Telephone test set having an auxiliary amplifier and speaker for permitting listening to line signals

  • US 4,691,336 A
  • Filed: 10/10/1986
  • Issued: 09/01/1987
  • Est. Priority Date: 10/10/1986
  • Status: Expired due to Term
First Claim
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1. A telephone test set comprising:

  • means for coupling the test set to tip and ring lines of a telephone lines;

    means for transmitting signals on the telephone line and means for receiving signals on the telephone line;

    the means for transmitting and the means for receiving being selectively coupled to the means for coupling;

    selectively energizable amplifier means for amplifying signals appearing on the telephone line;

    speaker means coupled to the amplifier means for reproducing signals appearing on the telephone line; and

    control means for disabling the means for transmitting and the means for receiving when the amplifier means is energized to prevent acoustic feedback to the amplifier means.

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