AUTOMATIC CHANGEOVER SYSTEM FOR OPTICAL TRANSMISSION SYSTEM

摘要

PURPOSE:To avoid the deterioration in the system reliability and the inoperation rate by selecting a standby line from an active line automatically by the discrimination of a receiver side when an optical transmission line being an outgoing line is faulty. CONSTITUTION:An optical transmission section 23A and an optical reception section 23B and a standby optical transmission line comprising an optical fiber 13B tying them are prepared for one outgoing line from a control station to a base station, and when any optical transmission line of each selector is faulty, the standby optical transmission line is automatically selected to relieve the optical transmission line by utilizing the diversity configuration. In this case, an alarm signal from the optical reception section 3B at a base station side is used for a trigger signal 26, an [N+1]XN switch 25A at a receiver side is used to select the standby optical transmission line in place of the faulty optical transmission line and the switching trigger signal 26 is transferred simultaneously to the sender side with a data link in a data line and an NX[N+1] switch 25B at the sender side is used to select automatically the standby optical transmission line from the faulty optical transmission line.