Intra-band control channels unavailable

What are the reasons for the intra-band control channels being unavailable?
Root cause:
Answer: 1. The physical board is offline, and the board reports the BD_STATUS alarm. 2. The number of optical ports in the config_snd state is beyond the limit. 3. The AdminStatus of the control channel is set to AdminDown manually, meaning that the control channel is closed. 4. The peer end NE is not an ASON NE or the ASON function is not enabled. 5. No optical port is designated to the DCC. 6. Optical-port-level alarms on the fiber cause the AdminStatus state to be AdminDown. 7. Bit errors on the optical port make the ECC unavailable. 8. The NE Node ID configuration is incorrect.
Suggestion and conclusion:

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