1:1 PROTECTION METHOD FOR WAVELENGTH MULTIPLEX OPTICAL COMMUNICATION SYSTEM, SYSTEM ADOPTING THE METHOD, NODE ADOPTING THE METHOD, AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a 1:1 protection system that can protect faults on a ring. SOLUTION: A fault detection section 506 detects the occurrence of a 2nd fault, a protection control section 513 receives the detection result, transmits a notice signal to an opposite node, a protection control section of the opposite node receiving the notice signal returns a switch-back notice to the node whose fault is detected, and the protection control section 513 of the node whose fault is detected that receives the notice switches back 2:1 optical switches 509-512 of a reception section.