Telephone line monitoring circuit for providing a visual and aud

Details Telephone line monitoring circuit for providing a visual and aud Telephone line monitoring circuit for providing a visual and aud

1989-09-18

1991-10-29

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

379 21, 379 27, H04M 124, H04M 324

Patent

active

050621319

ABSTRACT:
A telephone line monitoring apparatus which is used to continuously monitor the telephone line and provide both a visual signal and an auditory signal if the line becomes inoperative. The circuit is designed to be plugged into a conventional telephone jack and monitor the line voltage so that if the line voltage falls below about 6 volts DC or if the line is short circuited or becomes disconnected, the telephone line monitoring apparatus will cause a light emitting diode to flash on and off and further will cause an auditory sounder to emit an audible signal. The light emitting diode is a self-flashing type which serves to modulate the auditory signal.

REFERENCES:
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patent: 3976849 (1976-08-01), Champan
patent: 4002861 (1977-01-01), Putt
patent: 4373120 (1983-02-01), McDonald
patent: 4513176 (1985-04-01), Fostveit
patent: 4544807 (1985-10-01), Sers
patent: 4564728 (1986-01-01), Romano
patent: 4588862 (1986-05-01), Grabowg
patent: 4600810 (1986-07-01), Feldman
patent: 4827498 (1989-05-01), Ross
patent: 4841559 (1989-06-01), Curtis
patent: 4945555 (1990-07-01), Teumer et al.

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