System and method for programmable telephone subscriber line tes

Details System and method for programmable telephone subscriber line tes System and method for programmable telephone subscriber line tes

1997-06-20

2000-11-07

Chan, Wing F.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379399, 379412, H04M 100

Patent

active

061447226

ABSTRACT:
A system and method for providing software-implemented, programmable testing of telephone subscriber line power conditions during ring mode. A user-controlled fault detection system for detecting subscriber line faults, including resistive faults and foreign voltages, on a telephone subscriber line during ring mode is provided. A user interface is provided to enter user-programmable threshold values corresponding to subscriber ring mode line fault conditions. A fault threshold memory, coupled to the user interface, is provided to store the generated threshold values. A current level detector identifies a ring mode current during ringing on the telephone subscriber line. A processing unit is configured and arranged to compare the ring mode current on the telephone subscriber line to the generated threshold values stored in the fault threshold memory. A fault is identified in response to the comparison.

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Am79212/Am79C202 Advanced Subscriber Line Interface Circuit, Dec. 19, 1995, Chapter 8, 9, and 10.
Understanding Telephones, Julian Macassey, September 1985, pp. 1-9 (Obtained from the Internet at http://jedi.cis.temple.edu:8080/elite/begin/phonewrk.how).

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