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10 BaseT Patch/Crossover cable layout

568-B Wiring (RJ-45)

 .

568-A Wiring (RJ-45)

RJ-45 Pins 1-8
Facing Up
1 2   3   4 5   6   7 8
. . . . . . . .
. . . .
. . . .
. . . .
. . . .
Orange pair 2 . Blue pair 1 Brown pair 4
Green Pair 3

568B Wiring
Pair # Wire Pin
1 - White/Blue White/Blue 5
Blue/White 4
2 - White/Orange White/Orange 1
Orange White 2
3 - White/Green White/Green 3
Green/White 6
4 - White/Brown White/Brown 7
Brown/White 8

568 B Diagram

RJ-45 Pins 1-8
Facing Up
1 2   3   4 5   6   7 8
. . . . . . . .
. . . .
. . . .
. . . .
. . . .
Green pair 2 . Blue pair 1 Brown pair 4
Orange Pair 3

568A Wiring
Pair # Wire Pin
1 - White/Blue White/Blue 5
Blue/White 4
2 - White/Green White/Green 1
Green/White 2
3 - White/Orange White/Orange 3
Orange/White 6
4 - White/Brown White/Brown 7
Brown/White 8

568 A Diagram

Notes for wiring diagrams above:

  1. For patch cables, 568-B wiring is by far, the most common method.

  2. There is no difference in connectivity between 568B and 568A cables. Either wiring should work fine on any system.

  3. For a straight through cable, wire both ends identical.

  4. For a crossover cable, wire one end 568A and the other end 568B.

  5. Do not confuse pair numbers with pin numbers. A pair number is used for reference only
    (eg: 10BaseT Ethernet uses pairs 2 & 3). The pin numbers indicate actual physical locations on the plug and jack.

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