An enhanced optical module has two thresholds for optical power: a warning threshold and an alarm threshold.

•  When the receiving power of an interface falls below the lower warning threshold, packets may be lost on the interface, but the interface does not enter the linkdown state.

•  When the receiving power of an interface reaches the lower alarm threshold, severe packet loss may occur, or even the interface enters the linkdown state. A high receiving power may corrupt an optical module.

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