Power source control apparatus for telephone set

Details Power source control apparatus for telephone set Power source control apparatus for telephone set

1991-08-09

1995-01-10

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379413, 379322, H04M 1900

Patent

active

053814720

ABSTRACT:
A power source control circuit for a telephone set, includes a power source switch, a detecting circuit, a power hold circuit, and a control circuit. The power source switch supplies an external power to the telephone set. The detecting circuit detects an off-hook operation of the telephone set or an incoming signal arriving at a line. The power hold circuit holds the power source switch in an ON state for a predetermined time period on the basis of an output from the detecting circuit. The control circuit is activated by supply of the external power and transmits an extension signal for extending the ON state of the power source switch within the predetermine time period.

REFERENCES:
patent: 3800095 (1974-03-01), Cowpland
patent: 4748664 (1988-05-01), Blomely
patent: 4893337 (1990-01-01), Blossfeldt
patent: 4916735 (1990-04-01), Iida et al.
patent: 4961220 (1990-10-01), Tentler et al.
patent: 5216704 (1993-06-01), Williams et al.

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