Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent
1990-01-09
1990-11-06
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Monitoring
379 21, 379 27, H04M 124, H04M 324
Patent
active
049691791
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.
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Kanare Edward
Rehler Kenneth
Kanare Edward
Rozsa Thomas I.
Schreyer Stafford D.
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