Patents Assigned to Telic Alcatel, S.A.
  • Patent number: 4821314
    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.
    Type: Grant
    Filed: August 18, 1987
    Date of Patent: April 11, 1989
    Assignee: Telic Alcatel, S.A.
    Inventors: Roger Guyader, Jean-Marie Ploet