Telephone station signaling lock circuit

Details Telephone station signaling lock circuit Telephone station signaling lock circuit

1982-12-23

1984-06-05

Pellinen, A. D.

179 90D, 179189D, H04M 100

Patent

active

044530420

ABSTRACT:
A circuit which locks the signaling circuit of a telephone station. A microprocessor disconnects a keypad from an associated tone generator upon detection of operation of a lock button. The microprocessor connects the keypad to the tone generator upon detection of operation of the lock button and a predetermined unlock code provided by the keypad.

REFERENCES:
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4298775 (1981-11-01), Buck et al.

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