SWITCHING SYSTEM FOR TRANSMISSION SYSTEM

摘要

PURPOSE:To simplify the constitution of the switch control part, by forming the using transmission line so that it may be connected to the transmission line terminating device only when the end office device terminating the transmission line and otherwise may be connected to the repeating transmission device each. CONSTITUTION:The using transmission line 6 is connected to the end office device 2 via the transmission line terminating device 3 plus switching devices 7 and 1 at the switching stations A and D of both ends of the line 6. And the repeating transmission is carried out via the repeating transmission device 4 and without passing through the devices 7 and 1 at the stations other than stations A and D. The spare transmission line 5 is connected to the devices 7 and 1 via the device 3 at any one of the switching stations A-D. In case the N-th place of this using transmission system has some fault between stations A and B, the system N transmission line sends the number N to the switching station C. And at the same time, the line 5 between the stations A and B is extended up to the station C via the transmission line 5 between the stations B and C. And receiving the number N, the device 1 operates at the station C to give a switch connection to the line 5 to the device 2. At the same time, the switching is inhibited from the using line to the spare line.