Telephone line monitor/alarm

Details Telephone line monitor/alarm Telephone line monitor/alarm

1995-01-31

1997-12-09

Kuntz, Curtis

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

379 34, 379 7, 379 29, 379 35, H04M 100, H04M 308

Patent

active

056968108

ABSTRACT:
This invention is directed to a device for monitoring the integrity of telephone lines and for warning when the lines are inoperative. The device comprises a monitoring unit which continuously senses the voltage across the telephone lines and generates a control signal which assumes a first value when the lines are operational and a second value when the lines are inoperative. An alarm unit generates a warning signal of an audible frequency when the control signal assumes the second value, and is controlled with a switching unit. The switching unit maintains the alarm unit deactivated when the control signal has the first value and activates the alarm unit when the control signal has said second value.

REFERENCES:
patent: 4634813 (1987-01-01), Hensley
patent: 4827498 (1989-05-01), Ross
patent: 4922515 (1990-05-01), Simpson, Jr.
patent: 4969179 (1990-11-01), Kanare et al.
patent: 5056131 (1991-10-01), Kanare et al.
patent: 5062131 (1991-10-01), Kanare et al.

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