| 摘要 |
PURPOSE:To confirm a high-order fault section from a low-order network coupler and to speed up the restoration of a fault by discriminating the presence or absence of a receiving carrier detection during the fault locating packet transmittion with a fault locating device and whether the timing in which the receiving carrier is turned off is present before the completion of the trouble searching packet or present after it. CONSTITUTION:On a fault locating system, a high-order network star coupler 20, a low-order class star coupler 6 and a bidirectional repeater 11 are arranged, and a fault locating device 42 is connected to the star coupler 6 by a low-order network incoming fiber 5 and a low-order network fiber 31. From a fault locating packet generating device 43 of the device 42, a fault locating packet is inputted to a transmitter 44 for locating a fault and the packet of a wavelength lambda2 is outputted to the fiber 5 by a light-emitting element 43. The locating packet is repeated through the coupler 6 to a high-order network with the repeater 11 and the output to the low-order network is interrupted by a repeating side control part 16. A packet length supervising controller 47 detects the duration after the specified time from the reception starting of a low-order network side receiver 13 and confirms the fault section. |
