Telephone line monitoring apparatus and method

Details Telephone line monitoring apparatus and method Telephone line monitoring apparatus and method

1994-06-13

1996-09-03

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 7, 379 35, H04M 129, H04M 368, H04M 322

Patent

active

055531164

ABSTRACT:
A fax monitoring apparatus includes one or more line interface circuits to simultaneously detect and analyze audio signals produced on any given telephone line by two connected fax machines, analyzing circuitry to analyze and interpret the audio signals to form a compressed fax image, expansion circuitry, to expand the compressed fax image into a bit-mapped image, memory, to store the compressed fax image and/or the bit-mapped image, and display to display the bit-mapped image of the original fax transmission. A method for monitoring and analyzing the activity of a telephone line includes the steps of sampling the voltage of the telephone line to be monitored, calculating the mean value of the voltage from the samplings, comparing the mean value of the voltage with a reference voltage defined as the mean voltage obtained during the previous time interval, replacing the value of the reference voltage with the mean value, and upon activation, recording the activity of the telephone line.

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