Many cabling issues are obvious to
determine because they are usually due to faulty physical connections.
Reconnecting cables can resolve many of these problems.
Another common cable issue is mismatched interfaces. Different
cables look very similar. Always verify that the proper cable is
being used with the proper interface. The best way to verify that
the proper cabling is being used is to check the writing on the
cable. Most cables will have a written description on the side
detailing the cable type.
Also, placing cable near an electrical source can cause
signaling problems. Electromagnetic energy can pass through the
cable and interfere with the data being transmitted by that cable.