Message and ringing signaling device for a telephone installatio

Details Message and ringing signaling device for a telephone installatio Message and ringing signaling device for a telephone installatio

1987-08-18

1989-04-11

Brown, Thomas W.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379253, 379396, H04M 100, H04M 1902

Patent

active

048213144

ABSTRACT:
Message signaling device for a telephone installation having analog stations and station equipped for this purpose. The invention has as its objects a signaling device by light means for a telephone installation whose subscribers are equipped with analog stations and the stations equipped for this purpose. Each telephone station (4) concerned is equipped in parallel, on the one hand, with a message lamp (59) in series with a resistor (60), on the other hand, with a capacitor (61), coming out of the rectifier bridge (51) of the station. The message signaling is achieved by action of the control unit (3) of the telephone exchange equipment on the injector (36) of ringing signals assigned to the station, so as to cause it to transmit rhythmic signals which differ from the rhythmic ringing signals by the shorter period of the transmission phases of the signal and which make possible the lighting of the lamp.

REFERENCES:
patent: 3710032 (1973-01-01), Maw-huei
patent: 4140882 (1979-02-01), Regan et al.
patent: 4266101 (1981-05-01), Dussbar
patent: 4506115 (1985-03-01), Schmitt
patent: 4726048 (1988-02-01), Waldman et al.
patent: 4726060 (1988-02-01), Itoh et al.

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