Why does a subcard fail to register on a switch

The possible causes are:
The switch does not support the subcard.
The subcard is not hot swappable and can register successfully only after the switch restarts.
The subcard is not in a good contact with the backplane.
The system version of the switch needs upgrading.
NOTE:
When this occurs, send the bar code of the subcard and switch version information to Huawei technical personnel so that Huawei can fix the problem quickly.

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