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通过对ITU-TG.841建议中K1、K2字节分析,探讨了复用段共享保护环的环(Ring)倒换和跨距(Span)倒换的区别,以及SDH设备复用段倒换的实现,分析了二纤双向复用段保护环发生故障时和恢复时K1、K2字节传送过程及典型故障案例。
Through the analysis of K1 and K2 bytes in ITU-TG.841 proposal, the differences between ring switching and span switching in multiplex shared protection ring are discussed, and the realization of multiplex section switching in SDH equipment is discussed. The transmission process of K1 and K2 bytes and typical failure cases during the failure and recovery of the two-fiber bidirectional multiplex section guard ring are analyzed.