Relationship between the optical power of a line board and bit errors

Relationship between the optical power of a line board and bit errors:
Bit error events may occur when the receive optical power of a line board exceeds the upper or lower threshold. If bit error events occur when the receive optical power is between the lower threshold and the upper threshold, the possible causes are as follows:
The fiber quality deteriorates, the line board is faulty, or the connector is dirty.

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