| 摘要 |
PURPOSE:To reduce the fault recovery time and thus realizing a high reliability and an easy maintenance of the device, by detecting the area of the disconnection fault of the optical transmission line from the state before and after the optical switch is closed. CONSTITUTION:The optical information transmitting devices 6a-6e deliver the transmission signals each while holding a certain timing relation to the synchronous signals generated intermittently from the synchronous signal generator 4. These signals are all transmitted to the devices 6a-6e, and each device 6 extracts the signal allotted to own device each. If a disconnection fault occurs to the optical fibers 1b-1g during the communication carried out among the devices, the disconnection detector 5 detects this fault. Then the optical switch 3 is closed by the detection output, and thus the communication which is hitherto impossible becomes possible again among the devices. Then the timing relation is detected and displayed by the disconnection area detector 7 before and after the switch 13 is closed. Thus the faulty fiber can be known. |
