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the link is down. Check the line and confirm that the peer device is
enabled.
Note:
It is not allowed to excessively bend the fiber, and its radius of
curvature should be no less than 10cm ;
Ensure the cleanliness of the fiber end face; Please do not look
directly into the fiber optic connector with your eyes, as this may
cause eye damage.
2.3 Check before power-on
Check that the power supply of the power outlet meets the switch
specifications.
Check that the power supply, switch, and rack are properly
grounded.
Check whether the switch is connected to other network devices.