A cat 5 connector is not the same as a telephone jack.

A cat 5 connector is generally either a male or female RJ-45 jack or plug. RJ-45 jacks are similar to the RJ-11 jack in a telephone connection, only they have eight contacts, instead of four or six. This means that you cannot plug your computer cables into your phone jacks, or vice versa. They may resemble each other, but they are not the same. Computer cables will not fit into phone jacks, and phone lines will not fit into computer jacks. This can avoid confusion between the two and eliminate the need for troubleshooting a problem later.

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