TRANSMISSION LINE SYSTEM SWITCH SYSTEM, TRANSMISSION TERMINAL STATION EQUIPMENT, RELAY DEVICE AND SDH TRANSMISSION LINE SYSTEM SWITCH SYSTEM

摘要

PROBLEM TO BE SOLVED: To realize highly reliable system switching and to improve mainte nance.;SOLUTION: Signal transmission means 11a and 11b transmit signals from first and second systems. A fault detection means 12 detects a fault at the time of receiving the signal. A system switch means 13 autonomously switches the system to the side of the normal system in the first system or the second system based on the detection of the fault or warning information on the fault. Warning information generation means 21a and 21b generate warning information in the two systems. Relay means 22a and 22b control the relay of the signals or control the relay of warning information in the two systems.;COPYRIGHT: (C)2000,JPO