| 摘要 |
PURPOSE:To decrease the number of subscriber test circuits, by providing a subscriber test circuit between a line colletor switch and an allotter switch in order that both the originating and terminating signals can be passed through this subscriber test circuit in case of subscriber test connection. CONSTITUTION:In case the subscriber circuit is tested, when it is turned ON by operating a test key by SUB TEST, information is transmitted to the central processing unit CP, a regular relay of the subscriber side control device SUB CN is operated in accordance with the instruction from CP, and calling is displayed by the SUB TEST-subscriber test circuit TSTJC-SUB CN. CP is informed of calling from TSTJC, selects an idle multifrequency receiving device PBR, and also stores the connection of TSTJC and PBR, and transmits the connection information to the allotter switch control device NW CN. And NW CN connects TSTJC and PBR, and is able to carry out the transmission test, the transmission supervisory test, etc. in the form of a push-button dial. |
