单选题In optical channel transport unit overhead （OTU OH）， what are general communication channels 1 and 2（GCC1/GCC2） used for？（）Afor trail trace identificationBas the backward defect indicatorCto transmit information between OTU termination pointsDto extend command and management functions over several framesEGeneral communication channels 1 and 2 （GCC1/GCC2） do not belong to OTU OH
单选题
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
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