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/orange | 3 | 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 |