1000Base-T Cross Over Cable pin outs

You may have experienced not being able to connect two 1000baseT NICs or two 1000baseT switch interfaces, using a normal crossed ethernet cable. The reason you can't do this, is that 1000baseT use all four wire pairs available in a Cat5 cable, whereas 100baseTX only uses two wire pairs.

Because of this, the cable pinout is different.

Some smart 1000baseT interfaces (like the ones in Apple's G4 and G5 computers) don't need a crossover cable. They have something known as "auto-mdix", which enable them to sense how the cable is wired, and adjust to that.

But that is not the case for all interfaces.

Click here to see the Gigabit crossover diagram and pin outs - PDF File

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