问题描述:
[单选]
下面哪一个保护方式不需要APS协议Which of the following protection modes does not need the APS protocol?()
A.通道共享.Channel sharing
B.复用段共享. MS sharing
C.1+1保护.1+1 protection
D.1:N保护.1:N protection
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答案解析:无
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上一篇:在M800通道保护环中,如果出现保护倒换故障,可能的原因有很多,以下的几个原因中,哪个不是导致保护倒换失败的原因In the M800 channel protection ring, a lot of factors may cause the protection switchover failure. Among the following factors, which one is not the factor that causes the protection switchover failure?()
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