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Wiring an RJ-45 Jack for a PC
Last updated: 10/24/03

Q. How does one wire an RJ-45 jack for a PC connection to a broadband router, switch, or hub?

A. PCs connect to broadband routers, switches, and hubs with a straight-thru cables. Both ends of the cable, be they plugs, jacks, or a combination are wired identically for either the EIA/TIA 568A or 568B color standards. It's advisable for consistency, to use the same standard for all connectors from the router to the PC; however, straight-thru patch cables (the ends are identicle) going from jacks can be wired for either standard and they will work. Be advised that like plugs a twisted pair should not be untwisted more than 1/2 inch at jacks (1/4 inch for category 6 cabling). The easy way to do it is leave the ends twisted, untwist just enough a couple of inches form the end of the wire to get the two wires over the IDC contacts, punch down the wires, and then cut off the access with diags (diagonal cutters). There are jacks that do no require a 110 punch-down tool and they do work. Most jacks are color coded on the back for both standards. Follow the appropriate color code on the back of the jack and don't worry how they come-out at the front. Many jacks put an extra twist in the wires inside the jack. Use jacks rated CAT 5 or above. Most will say what they are rated for on the front of the jack. Do not use stranded wire on jacks. If you use solid core wire with plugs, be advised that there are plugs designed for stranded wire, plugs designed for solid core wire, and plugs that can be used for both. Larry

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