Gigabit Ethernet (GigE) crossover pinouts

It is a common misconception that the Gigabit Ethernet spec requires Auto-MDIX capabilities -- it doesn't!

 A (copper) GE cable has all four pairs crossed over: 1-3 2-6 3-1 6-2 4-7 5-8 7-4 8-5 -- this is different to 10/100 BaseT which only requires 2 pairs.

Pin Signal Color Pin Signal Color
1 BI_DA+ white/green 1 BI_DA+ white/orange
2 BI_DA- green 2 BI_DA- orange
3 BI_DB+ white/orange3 BI_DB+ white/green
4 BI_DC+ blue 4 BI_DC+ white/brown
5 BI_DC- white/blue 5 BI_DC- brown
6 BI_DB- orange 6 BI_DB- green
7 BI_DD+ white/brown 7 BI_DD+ blue
8 BI_DD- brown 8 BI_DD- white/blue