Fault symptom: When an upstream board is used to transmit upstream services, upstream services become unavailable after the control board is replaced.
Cause: The upstream board is not compatible with the new control board.
Solution: Replace the upstream board with a new one that is compatible with the new control board and provides functions of the old upstream board.
Note:
The configuration file of the upstream board may need to be updated after the replacement. If it is updated, activate the new configuration file and then upstream services are available.