This Instructable will assume you are augmenting your existing modular jack system.ģ. This is not strictly necessary, but if you don't you will have to spend extra money on more jacks.
Also, it will not work with gigabit ethernet- gigabit ethernet uses all four pairs. See step 13 for a possibly unsafe way to keep your PoE and add phone service. Nothing bad will happen, it just won't transmit power. Also note that this procedure will not work with PoE (Power over Ethernet) devices. Note that I have not done extensive testing with cross-talk between phone and ethernet, though I have seen no degradation in the quality of either when both are in use. In fact, you could run two Ethernet jacks from a single cat-5 cable, or four telephone lines (though I don't know why you would run multiple phone lines.) This Instructable will focus on changing wall plates from one RJ-45 (Ethernet) jack into one RJ-45 and one RJ-11 (phone) jack. Therefore, you can run both ethernet and telephone over the same wire, and still have two wires left over. Ethernet uses two pairs (four wires), one for send and one for receive.
Cat 5 cable and RJ-45 jacks have eight wires. This is made possible because of the wasteful (some may say "spare") wires in cat-5 cable. Don't blame me if you shock yourself (unlikely), damage Ethernet devices (also unlikely), damage phones (not as unlikely), damage your house wiring (not too unlikely), or damage your fingers with knives (rather likely). However, if you do everything right, they won't care. The telephone company won't be pleased if you short your telephone wires together. Disclaimer: I'm not sure if this is legal. This neat hack could save you a lot of money, as you only have to buy new wall plates and jacks rather than wall plates, jacks, and hundreds of feet of wire. Every wall jack becomes two jacks, one RJ-11 for phone and one RJ-45 for ethernet. The solution is to run both ethernet and phone over the same existing cat-5 cable. Unfortunately, the wifi is a bit flaky in places (even with two access points.) This got annoying up until the point where three of the four wall jacks were being used for ethernet, leaving just one for phone. When we got our new house built, we chose to get four of these jacks, and we intended to use them for phone service. These jacks can then be used for either ethernet or phone. The new fad when building a house is to run Cat-5 cable to every wall jack.
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