Call circuit for key telephone system for giving direct station

Details Call circuit for key telephone system for giving direct station Call circuit for key telephone system for giving direct station

1976-03-03

1977-03-08

Claffy, Kathleen H.

179 18AD, 179 27FE, H04M 100

Patent

active

040114155

ABSTRACT:
A first and a second power source have a predetermined potential difference at their outputs and supply direct currents to a station call line and a direct station selection call line respectively. A non-linear element is inserted between a point at which the station call line and the direct station selection call line are connected to each other and the first power source. When the direct station selection call is established, the non-linear element is turned off due to the potential difference between the first and the second power sources so that the direct station selection call is given priority over the station call.

REFERENCES:
patent: 3115551 (1963-12-01), Plyer
patent: 3299217 (1967-01-01), Burns
patent: 3541268 (1970-11-01), Zucker
patent: 3787640 (1974-01-01), Bush et al.
patent: 3898392 (1975-08-01), Jackson
patent: 3904834 (1975-09-01), Shinoi et al.
patent: 3927278 (1975-12-01), Tsutsumi et al.

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