Crossover Cable Pinouts
In practice, it does not matter if non-crossover Ethernet cables are wired as T568A or T568B, just so long as both ends follow the same wiring format. Typical commercially available "pre-wired" cables can follow either format depending the manufacturer. What this means is that one manufacturer's cables are wired one way and another's the other way, yet both are correct and will work. In either case, T568A or T568B, a normal (un-crossed) cable will have both ends wired according to the layout in the Connection 1 column.
Although the Gigabit crossover is defined in the Gigabit Ethernet standard, in practice all Gigabit PHYs feature an auto-MDIX capability and are designed for compatibility with the existing 100BASE-TX crossovers. The IEEE-specified Gigabit crossover is generally seen as unnecessary.
Certain equipment or installations, including those in which phone and/or power are mixed with data in the same cable, may require that the "non-data" pairs 1 and 4 (pins 4, 5, 7 and 8) remain un-crossed.
| Pin | Connection 1: T568A |
Connection 2: T568B |
Pins on plug face | ||||
|---|---|---|---|---|---|---|---|
| signal | pair | color | signal | pair | color | ||
| 1 | BI_DA+ | 3 | white/green stripe |
BI_DB+ | 2 | white/orange stripe |
|
| 2 | BI_DA- | 3 | green solid |
BI_DB- | 2 | orange solid |
|
| 3 | BI_DB+ | 2 | white/orange stripe |
BI_DA+ | 3 | white/green stripe |
|
| 4 | 1 | blue solid |
1 | blue solid |
|||
| 5 | 1 | white/blue stripe |
1 | white/blue stripe |
|||
| 6 | BI_DB- | 2 | orange solid |
BI_DA- | 3 | green solid |
|
| 7 | 4 | white/brown stripe |
4 | white/brown stripe |
|||
| 8 | 4 | brown solid |
4 | brown solid |
|||
| Pin | Connection 1: T568A | Connection 2: T568A Crossed | Pins on plug face | ||||
|---|---|---|---|---|---|---|---|
| signal | pair | color | signal | pair | color | ||
| 1 | BI_DA+ | 3 | white/green stripe |
BI_DB+ | 2 | white/orange stripe |
|
| 2 | BI_DA- | 3 | green solid |
BI_DB- | 2 | orange solid |
|
| 3 | BI_DB+ | 2 | white/orange stripe |
BI_DA+ | 3 | white/green stripe |
|
| 4 | BI_DC+ | 1 | blue solid |
BI_DD+ | 4 | white/brown stripe |
|
| 5 | BI_DC- | 1 | white/blue stripe |
BI_DD- | 4 | brown solid |
|
| 6 | BI_DB- | 2 | orange solid |
BI_DA- | 3 | green solid |
|
| 7 | BI_DD+ | 4 | white/brown stripe |
BI_DC+ | 1 | blue solid |
|
| 8 | BI_DD- | 4 | brown solid |
BI_DC- | 1 | white/blue stripe |
|
| Pin | Connection 1: T568B | Connection 2: T568B Crossed | Pins on plug face | ||||
|---|---|---|---|---|---|---|---|
| signal | pair | color | signal | pair | color | ||
| 1 | BI_DA+ | 2 | white/orange stripe |
BI_DB+ | 3 | white/green stripe |
|
| 2 | BI_DA- | 2 | orange solid |
BI_DB- | 3 | green solid |
|
| 3 | BI_DB+ | 3 | white/green stripe |
BI_DA+ | 2 | white/orange stripe |
|
| 4 | BI_DC+ | 1 | blue solid |
BI_DD+ | 4 | white/brown stripe |
|
| 5 | BI_DC- | 1 | white/blue stripe |
BI_DD- | 4 | brown solid |
|
| 6 | BI_DB- | 3 | green solid |
BI_DA- | 2 | orange solid |
|
| 7 | BI_DD+ | 4 | white/brown stripe |
BI_DC+ | 1 | blue solid |
|
| 8 | BI_DD- | 4 | brown solid |
BI_DC- | 1 | white/blue stripe |
|
Read more about this topic: Ethernet Crossover Cable
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