FAULT DETECTING AND ELIMINATING METHOD FOR OPTICAL COMMUNICATION SYSTEM

摘要

PURPOSE:To evade the communication disabled state of the entire system due to a fault signal by using one of plural nodes as a supervisory node, allowing the supervisory node to apply on/off control to the power supply to an optical transmission/reception section in a prescribed order so as to detect a faulty node and using an electric signal transmission line so as to apply communication between the faulty node and the supervisory node. CONSTITUTION:If a fault signal takes place in an optical transmission line 24, a supervisory node 21 detects a fault and applies on/off control to the power supply to each optical transmission/reception section 32 of nodes 22a-22c to be supervised in a prescribed order via electric signal transmission lines 25a-25c while supervising the change in the signal state of the optical transmission line 24. When the fault of the line 24 is relieved with the power supply stop to the optical transmission/reception section 32, it is discriminated that the node to be supervised whose power supply is stopped is faulty and the detection of the faulty node is detected. Then the power supply to the optical transmission/reception section 32 of the faulty node is kept stopped and the communication through the optical line 24 between the nodes except the faulty node is attained and the communication between the faulty node and the other nodes is executed through the electric signal transmission lines 25a-25c then remarkable degrading of the system function is evaded.