In optical channel transport unit overhead (OTU OH), what are general communication channels 1 and 2(GCC1/GCC2) used for?()
- Afor trail trace identification
- Bas the backward defect indicator
- Cto transmit information between OTU termination points
- Dto extend command and management functions over several frames
- EGeneral communication channels 1 and 2 (GCC1/GCC2) do not belong to OTU OH