Automatic positive telephone disconnect system

Details Automatic positive telephone disconnect system Automatic positive telephone disconnect system

1989-04-13

1990-08-14

Ng, Jin F.

Telephonic communications

Call or terminal access alarm or control

At substation

379 35, 379379, H04M 100

Patent

active

049493752

ABSTRACT:
The invention represents an automatic positive disconnect circuit for controlling the connection of a communication device having two signal conducting lines and sensing means for indicating the mode of said communication device. The circuit is designed to positively disconnect the first and second lines of the communication device when the latter is in the non-operating mode, to filter selected frequencies when in the operating mode, and to permit said communication device to otherwise operate in a normal manner whenever a call is received or a call is initiated.

REFERENCES:
patent: 3614334 (1971-10-01), Bonvallet
patent: 3715514 (1973-02-01), Bell, Jr.
patent: 4156799 (1979-05-01), Cave
patent: 4326104 (1982-04-01), Bergida
patent: 4675901 (1987-06-01), Smith et al.
patent: 4837819 (1989-06-01), McClain

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