题目内容
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[多选题]
About ZXCTN equipment's protection switching, which of the following are correct？
A.nSignal failure switching of tunnel depends on whether port is dow
B.nSignal failure switching of tunnel depends on whether CC packets are lost
C.n1:1 switching of tunnel depends on APS protocol and is bidirectional switching
D.n1+1 switching of tunnel depends on APS protocol and is unidirectional switching
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