| 摘要 |
PURPOSE:To confirm the state of power supply in applying and the failure in generating of each switchboard, by providing a means discriminating the response from a switchboard for a response refuesting signal to the switchboard. CONSTITUTION:Call information of switchboards T1-Tn passes through a multiplexer/demultiplexer via subscriber circuits SLC for the switchboards and is connected to a network NW of the exchange side on a highway HW. Control lines (a), (b) are connected to a board interface circuit BDI in a switchboard controller TCTL, and a control signal is controlled with a control section MPU and a memory MEM. The device TCTL sets the content of memory representing the loading/unloading information of the boards and the state of power application initially. The response requesting signal is transmitted in order to the boards, and whether or not the response from the boards T1-Tn exists within a prescribed time for the response requesting signal, allowing to discriminate the state of power supply application and failure. |
