Data signalling unit for telephone systems

Details Data signalling unit for telephone systems Data signalling unit for telephone systems

1975-12-12

1976-10-19

Stellar, George G.

H04M 1100

Patent

active

039872475

ABSTRACT:
A data signalling system for in-house telephone systems of either the rotary dial or the tone dial type responds to conventional digit defining dial signals.
Control gates respond to conventional trunk relay signal patterns to trigger various logic functions in conjunction with trunk seize, dialing and hang-up.
A numeric printer is fed digital signals from logic circuitry which has accumulated and stored the dialed data and is capable of presenting numeric and alpha display.

REFERENCES:
patent: 3674941 (1972-07-01), Guetta
patent: 3675204 (1972-07-01), Miehle et al.
patent: 3819862 (1974-06-01), Hedges
patent: 3854009 (1974-12-01), Pirnie
patent: 3924071 (1975-12-01), Pirnie

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