Device for detecting operation state of telephone hook switch

Details Device for detecting operation state of telephone hook switch Device for detecting operation state of telephone hook switch

1995-06-01

1996-10-29

Chin, Wellington

Telephonic communications

Multi-line or key substation system with selective switching...

Line status indication or call alerting

379 31, 379 32, 379124, 379156, 379157, 379161, 379188, 379189, 379199, 379200, H04M 322, H04M 100, H04M 300, H04M 166

Patent

active

055704182

ABSTRACT:
A device for detecting an operation state of a telephone hook switch in a telephone includes a timer, a controlling circuit, a counter and a table electrically interconnected. According to the present invention, the abnormal signals generated by the hook switch cannot be accepted by an exchange or even if the signals are accepted by the exchanger, the mute function of the telephone will be utilized to make the users unable to listen to each other.

REFERENCES:
patent: 4003800 (1976-12-01), Jackson
patent: 4008379 (1977-02-01), Watkins
patent: 4012602 (1977-03-01), Jackson
patent: 4063036 (1977-12-01), Hunsicker
patent: 4232200 (1980-11-01), Hestad
patent: 4683583 (1987-07-01), Kossor
patent: 4833707 (1989-05-01), Serret
patent: 4860347 (1989-08-01), Costello
patent: 4924499 (1990-05-01), Serby
patent: 4965459 (1990-10-01), Murray

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