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Alarm and test system for a digital added main line

  • US 5,111,497 A
  • Filed: 09/17/1990
  • Issued: 05/05/1992
  • Est. Priority Date: 09/17/1990
  • Status: Expired due to Term
First Claim
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1. A test system for a digital main line system, said digital main line system including a line card for conversion of analog signals to digital signals and a remote terminal for conversion of said digital signals to analog signals for use in subscriber telephonic equipment, said digital main line system adapted to transmit multiple telephonic signals in digital form from said line card to said remote terminal location over a single twisted pair, comprising:

  • a) a remote terminal emulator at central office facilities for performing a line card test, said remote terminal emulator emulating output of said remote terminal with a predefined output pattern; and

    b) means for comparing a response of said line card to emulated output of said remote terminal emulator so as to detect failures in said line card.

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