A crossed ethernet cable is used for communication between two computers without using network gear such as a router, switch or a hub.

To identify a cross-over ethernet cable, hold one end as if to plug it into a wall jack, the locking tab down (contacts facing you). The contacts are numbered 1-8 from left to right. One end will have a different color sequence to the other. A crossover cable, like a straight through cable, works both ways.

Using the 568B standard, the wiring sequence for ONE end (that may be labeled T-568B):

PIN 1 - White/orange
PIN 2 - orange
PIN 3 - white/green
PIN 4 - blue
PIN 5 - white/blue
PIN 6 - green
PIN 7 - white/brown
PIN 8 - brown

The for the OTHER end (that may be labeled T-568A):

PIN 1 - White/green
PIN 2 - green
PIN 3 - white/orange
PIN 4 - white/brown
PIN 5 - brown
PIN 6 - orange
PIN 7 - blue
PIN 8 - white/blue

If both ends have the same color sequence (usually T-568A, but it doesn't really matter), it is a straight-through cable.

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by stephen d8
last modified: 2007-05-16 14:55:20