| 摘要 |
PURPOSE:To make it possible to set a communication circuit so that circuits is restored rapidly at the time of emergency, etc., by giving the functions of a exchanging equipment to a circuit equipment for responding to the circuit. CONSTITUTION:Photocouplers (1)-(4) inverse polarities of lines A1 and B1 and relay an answer signal to a former stage after detecting an answer of a rear stage. Moreover, at the same time, they deliver charging pulses in accordance with the designation of a central processor equipment 198. Photocouplers (5) and (6) have similar functions as a calling side monitoring relay A photocoupler (7) detects answers fromthe rear stage. Photocoupers (8) and (9) receive a select signal from the calling side with a select signal receiving device 194, and set an interrupted condition for the select signal to be sent the next with a number sending section 195. The interrupted state is left as it is. A photocoupler (10) forms a loop for waking-up the rear stage and, at the same time, operates while the select signal is sent, and then, sets the rear stage to a condition in which said stage can send the select signal. |
