Test telephone

Details Test telephone Test telephone

1997-10-09

2000-05-09

Kuntz, Curtis A.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379 21, 379 27, 379337, H04M 124, H04M 308, H04M 322

Patent

active

060614293

ABSTRACT:
A test terminal includes a circuit for opening a loop switch to prevent setting up of calls from the terminal via a telephone line when a signal received from the telephone line via a first high-impedance connection exceeds a predetermined threshold indicating that the telephone line is busy. An alarm circuit indicates that any call from the terminal is prohibited. Operation of the terminal in discreet monitoring mode is also prohibited if the line is busy.

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patent: 5652575 (1997-07-01), Pryor et al.
patent: 5668870 (1997-09-01), Dahlquist
patent: 5675640 (1997-10-01), Tappert et al.

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