Troubleshooting Cabling Problems
Cable accounts for a great many of the problems on a network. There are many places to look when you suspect a cable-related problem. If you suspect that cable is at the bottom of your network troubles, consider the following areas:
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Loose connections You need to verify that cables are securely attached and that they are attached to the correct ports.
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Poorly crimped or bent cable Sometimes a chair running over a cable or a cable that has a poor crimp can cause problems.
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Incorrect cable length Recall from that cables cannot exceed a specified maximum length.
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Cable placement Care must be taken when cables are run too closely to strong electrical devices. If cables are run too closely to electrical devices, you need to ensure that they are designed for the task.