| 摘要 |
<p>The invention relates to a luminous signalling device for a telephone system whose subscribers are provided with analog apparatuses, as well as the apparatuses equipped for this purpose. Each telephone apparatus (4) concerned is equipped in parallel, on the one hand, with a message lamp (59) in series with a resistor (60), and on the other hand with a capacitor (61) at the output of the rectifier bridge (51) of the apparatus. The message signalling is carried out through the action of the control unit (3) of the central equipment on the call-signal injector (36) assigned to the apparatus, so as to make it transmit clocked signals which differ from the clocked call-signals by the shortest duration of the signal transmission phases and which enable the lamp to be lit. <IMAGE></p> |
