Causes Of Excessive Attenuation: Notes

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Excessive attenuation can be caused by the following reasons:

Bends in the fiber optic cable with a radius of less than 50 mm.
Kinks in the fiber optic cable
Squashed or compressed fiber optic cable
Damaged insulation on fiber optic cable
Stretched fiber optic cable
Dirt or grease on the exposed cable ends
Scratches on the exposed cable ends
Overheated fiber optic cable
Here are some examples of various fiber optic cable failures: