Thats worse than just broken.
Broken fiber optic cable.
The glass fiber within the cable is fragile and although the cable has been designed to protect the fiber it can be damaged more easily than a copper wire.
The image below shows a fibre optic patch where the rack door has been pressing on the patch where the strain relief ends and rather obviously bend radius has been severely compromised.
The most common damage is a broken fiber which is difficult to detect.
However optical fiber has a few idiosyncrasies.
This online session will guide you through.
It is better to have a broken cable that doesn t work at all than have one that works partly but not efficiently.
The basic approach to pulling fiber optic cable and copper cable is similar.
It is quite difficult to test a damaged cable making the choice of replacing your fiber optic wires the best alternative.
After going through the steps for repairing the fiber optic cable you may wonder whether you should chose the mechanical splicing or fusion splicing.
While fiber optic wires are designed to be resistant damage still happens.