Method of predicting voltages in telephone line measurement

Details Method of predicting voltages in telephone line measurement Method of predicting voltages in telephone line measurement

1995-06-02

1997-04-29

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 32, 379 34, 379 1, 379 24, 324713, H04M 308, H04M 327, H04M 124

Patent

active

056256671

ABSTRACT:
For measuring characteristics (resistance, capacitance, and foreign voltage) on a telephone line, source voltages are coupled via source resistances to the line in three test conditions and the parameters are calculated from steady state voltages at the terminals of the line. Each steady state voltage is predictively calculated from nine samples of the voltage at the terminal using a closed form second order solution of a circuit model of the telephone line derived from a transformation of the circuit model into the Z domain and using the matched pole-zero technique. The steady state voltages can thus be determined without waiting for transients, due to the time constants of the telephone line, to die out, resulting in much faster measurements for telephone lines with large time constants.

REFERENCES:
patent: Re30692 (1981-07-01), Ellson
patent: 4845737 (1989-07-01), Ohlenorf et al.
patent: 5392327 (1995-02-01), Galpin
patent: 5436953 (1995-07-01), Nilson
patent: 5440612 (1995-08-01), Siligoni et al.
patent: 5444759 (1995-08-01), Vogt, III et al.

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