| 摘要 |
PURPOSE:To simplify the constitution of a system and to improve the processing ability of a controller by operating and switching a switching circuit through a controller in accordance with a circuit switching discrimination number generated from an extension or line wire connected to an exchange. CONSTITUTION:A channel switch NW is provided between a subscriber circuit LC of an automatic exchange and trunk lines A and B, and a controller CONT is connected to the switch NW. An action discrimination number and a restoration discrimination number with respect to switching circuits TRU0 and TRU1 corresponding to the trunk line A or B are stored on this controller CONT, which detects the hooked state of an extension subscrier EXT, and connects the circuit LC to a trunk line trunk COT through the switch NW. Actions and switching of the switching circuits TRU0 and TRU1 are controlled by the controller CONT in accordance with the circuit switching discrimination number from the subscriber EXT or the trunk line A or B, and the constitution of the system can be simplified without installation of a scanning device, etc. |
