试题详情
- 单项选择题In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）
A、for trail trace identification
B、as the backward defect indicator
C、to transmit information between OTU termination points
D、to extend command and management functions over several frames
E、General communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH
- E
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