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

1993-09-20

1995-08-22

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 322, H04M 124

Patent

active

054447593

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: 4006319 (1977-02-01), Gartner
patent: 4028507 (1977-06-01), Hoppough
patent: 4514694 (1985-04-01), Finger
patent: 4895737 (1989-07-01), Ohbandorf et al.
"Subscriber Line Testing for Digital Switching Offices", IEEE Transactions On Communications, vol. COM-29, No. 10, Oct. 1981 T. A. Hanrahan et al, pp. 1434-1441.
Lewis, Frank L., "Applied Optimal Control & Estimation-Digital Design & Implementation", Prentice Hall publisher, pp. 257-259.

Affiliated with

Also associated with

Rating

Method of predicting voltages in telephone line measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of predicting voltages in telephone line measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of predicting voltages in telephone line measurement will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2147705