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T-568 and Telephone Color CodesTelephone CablePhone cable generally contains two pairs of wires, for two phone lines. The first pair is green and red; the second is black and yellow. The way you remember this is that there are two holidays: Christmas and Halloween. (I apologize if this is a US-centric mnemonic. I encourage everyone around the world to celebrate Halloween.) This set of colors is standardized for stranded wires (where each "wire" consists of about 20 little tiny wires that stick in your fingers and hurt like hell if you aren't careful.) For solid wires, the colors defined below for Ethernet are used; pair 1 is White/Blue+Blue, pair 2 is White/Orange+Orange.RJ-11 Plug Wiring  This is the wiring for the plug side of an RJ-11 connector. Can you say "BRGY"? (Think about cheap red wine; I know I do.) The diagram is shown with the "hook" - the little thing you press on to get the plug out - underneath. RJ-11 sockets always have the colors indicated on the terminals. Note that the connector on the other end of an RJ-11
connector is wired in reverse order. That is, if you stretch the
cable out flat, the Black wire stays on the left all the way to the
other end, including through the connector with the hook oriented down
also. Also note that the RJ-11 connector has six terminals on it. Only
the middle 4 are normally used. Line 1 is the center pair: red and
green, as in Christmas. T-568B Color Code for RJ-45 PlugEight-conductor data cable contains 4 pairs of wires. Each pair consists of a solid (or predominantly) colored wire and a white wire with a stripe of the same color. The pairs are twisted together. To maintain reliability on Ethernet, you should not untwist them any more than necessary (like about 1 cm).
Note that the Blue pair is on the center pins and conveniently
corresponds to the Red and Green pair in a normal phone line. The
connections shown are specifically for an RJ45 plug (the thing on the
end of the wire). The wall jack may be wired in a different sequence
because the wires are actually crossed inside the jack. The jack should
either come with a wiring diagram or at least designate pin numbers that
you can match up to the color code below. Pin Number Designations Color Codes for T568B Pin color pair name --- ----- ---- --------- 1 wh/or 2 TxData + 2 or 2 TxData - 3 wh/grn 3 RecvData+ 4 blu 1 5 wh/blu 1 6 grn 3 RecvData- 7 wh/brn 4 8 brn 4Note that the odd pin numbers are always the white with stripe color. Info found at
http://www.pronet.no/sverre/wires/colors.html Note: The hook is underneath in all cases and
Pin one is always on the Left
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