| 摘要 |
PURPOSE:To exactly execute counting of an imposing pulse, by providng a switching element by which a call meter is operated or nor operated in accordance with a position of a switch for operating the call meter, on a control part for controlling a call meter panel part on which the switch concerned is provided. CONSTITUTION:A call meter panel part 1 has a call meter 11, a switch 12 and a lingt emitting diode 13. A control part 2 has a transistor 21 which is turned on by an imposing pulse signal S1, a switching element 22 for detecting a state of the switch 12, and a switching element 23 for an operable signal S3. When an operator switches the switch 13 by connecting an extension and an office line, the switching element 22 becomes on, and an imposing requset signal S2 is applied to a driving controlling circuit 3. In this way, the operable signal S3 is outputted, to turn on the switching element 23, is turned on, to hold the call meter 11 in an operative state and to count exactly. |
