Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1997-06-20
1999-09-21
Kuntz, Curtis A.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 1, 379 26, 379 30, H04M 124, H04M 308, H04M 322
Patent
active
059563869
ABSTRACT:
A system and method for performing diagnostic leakage impedance testing at the subscriber line interface utilizing portions of existing circuitry designated for driving current on the telephone line during normal operation is provided. The diagnostic apparatus is used with a telephone line drive system having a tip-line current-mode amplifier for driving current on the tip line and a ring-line current-mode amplifier for driving current on the ring line during normal operation. A control signal generator generates voltage control signals corresponding to desired subscriber loop voltage characteristics. A voltage sense circuit compares the voltage control signals to actual subscriber loop voltage characteristics resulting from driving the current on the subscriber loop. The current driven onto the subscriber loop is adjusted accordingly. A processor receives an indication of a current level of the current driven onto the subscriber loop, and calculates the leakage impedances on the subscriber loop in response to the current level and the voltage control signals.
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Advanced Micro Devices , Inc.
Kuntz Curtis A.
Tieu Binh K.
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