Phone busy circuit

Details Phone busy circuit Phone busy circuit

1992-10-13

1994-10-11

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379 82, 379 96, H04M 165

Patent

active

053554078

ABSTRACT:
A switching circuit places a load across the TIP and RING signals of a telephone line when the computer is reset and removes the load when the computer accesses a selected memory location. Thus, the telephone line remains in an off-hook state after the computer is reset and remains in that state until the computer executes software that causes the telephone line to return to the on-hook state. The computer may also execute software that causes the telephone line to enter the off-hook state.

REFERENCES:
patent: 3858008 (1974-12-01), Remec
patent: 4051326 (1977-09-01), Padagnani et al.
patent: 4314103 (1982-02-01), Wilson
patent: 4759052 (1988-07-01), Hashimoto
patent: 4995074 (1991-02-01), Goldman et al.
patent: 5003581 (1991-03-01), Pittard
patent: 5018190 (1991-05-01), Walker et al.
patent: 5086453 (1992-02-01), Senoo et al.

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