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[多选题]
For the 1+1 unidirectional path protection and 1:1 bidirectional path protection, whic
A.The PTN equipment supports 1+1 unidirectional path protection and 1:1 bidirectional path protection.
B.1:1 bidirectional path protection supports return mode and non-return mod
C.The protection delay can be configured to be 0-10 s (with the step length of 100 ms).
D.In the return mode, WTR can be configure to be 1-12 min (with the step length of 1 min).
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