| 摘要 |
PURPOSE:To detect the trunk line calling charge of an extension subscriber without giving mechanical and cost loads to the main body of an exchange, by providing a call current monitoring circuit, a charging information receiving circuit, a call meter, a changeover switch of the call meter, etc. for each trunk line. CONSTITUTION:A circuit L1/L2 led from a trunk line CO is connected to a charging pulse detecting unit SPM via a main distributing frame MDF. The unit SPM is connected to an exchange EX connected to an extension subscriber SUB. An operator seat OP is connected to the EX and the SPM, and an attendant board device T including a control part to process outgoing and informing calls and a meter panel M including a call meter panel part are provided to the seat OP. Then the trunk line calling charge of an extension subscriber is detected by a call current monitoring means, a charging signal receiving means, a metering/ displaying means, a metering possible/impossible switch, etc. which are provided for each trunk line. Thus the calling charge is detected without giving any load to the exchange EX. |
