| 摘要 |
PURPOSE:To control the connection, holding, general connection, and restoration between the serves and the circuits, by using latch relays for the connecting switch and each circuit trunk and selectively controlling the ON-OFF operation of the relays with signals which are obtained by encoding server's operation. CONSTITUTION:Each circuit trunk to be contained in a command device is connected with connecting switches SWO-SWX consisting of latch relays. In addition to the circuit trunk, the command device is equipped with a position circuit POS which performs the bothway connection with these circuits, an attendant board ATT, an amplifier AMP for command consisting a command channel, a command common circuit D.COM, a central controller CCU which controls these devices and circuits, and a connection control device CN.CONT which directly turns on or off the connecting switches SW. By connecting operations performed through the position circuit POS connected to the attendant board ATT, ON or OFF corresponding to the server and circuit No. are encoded and outputted in accordance with the kind of connection. In this way, a desired holding control is performed by operating the latch relays. |
