| 摘要 |
PURPOSE:To reduce the hardware of a channel trunk control device by entirely executing the timing at the time of switching each sequence which has been generated independently by the trunk control device, and the combinatorial logic with the check effect in that case, in accordance with a program of the central control device. CONSTITUTION:When the channel trunk control device STC has received an order from the central control device CC so that one point in the network NW or various trunks TRK is controlled, it independently generates various kinds of timing and the timing in the course of sequence, and drives the channel switch or the latch relay of the trunk TRK, which has been ordered by the device CC, by means of the relay driving device RC. Various driving and check timing in the driving period are set to the programmable timer, the interruption is made to the device CC at every various driving and check timing, the device CC decides a state each time, the interruption time is set to the timer when necessary, and also the latch relay is operated and released by the driving device RC. |
