Ethernet, RJ45

Ethernet EIA/TIA-568A/B


Pin Pair Signal Wire Color
T568A T568B 10/100Base-T 1000Base-T T568A T568B
1 3 2 TX+ BI_DA+ +/tip
white/green

white/orange
2 3 2 TX- BI_DA- -/ring
green

orange
3 2 3 RX+ BI_DB+ +/tip
white/orange

white/green
4 1 1 BI_DC+ -/ring
blue

blue
5 1 1 BI_DC- +/tip
white/blue

white/blue
6 2 3 RX- BI_DB- -/ring
orange

green
7 4 4 BI_DD+ +/tip
white/brown

white/brown
8 4 4 BI_DD- -/ring
brown

brown

Direct Connection EIA/TIA-568A

Direct Connection EIA/TIA-568B

 


Cross-over cable pinouts

Cross-over cable EIA/TIA-568A/B (10Base-T, 100Base-TX)

10BASE-T or 100BASE-TX crossover

Pin Connection 1: T568A Connection 2: T568B
signal pair color signal pair color
1 BI_DA+ 3
white/green
BI_DB+ 2
white/orange
2 BI_DA- 3
green
BI_DB- 2
orange
3 BI_DB+ 2
white/orange
BI_DA+ 3
white/green
4 1
blue
1
blue
5 1
white/blue
1
white/blue
6 BI_DB- 2
orange
BI_DA- 3
green
7 4
white/brown
4
white/brown
8 4
brown
4
brown

Gigabit T568A crossover
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover

Pin Connection 1: T568A Connection 2: T568A Crossed
signal pair color signal pair color
1 BI_DA+ 3
white/green
BI_DB+ 2
white/orange
2 BI_DA- 3
green
BI_DB- 2
orange
3 BI_DB+ 2
white/orange
BI_DA+ 3
white/green
4 BI_DC+ 1
blue
BI_DD+ 4
white/brown
5 BI_DC- 1
white/blue
BI_DD- 4
brown
6 BI_DB- 2
orange
BI_DA- 3
green
7 BI_DD+ 4
white/brown
BI_DC+ 1
blue
8 BI_DD- 4
brown
BI_DC- 1
white/blue

Gigabit T568B crossover
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover

Pin Connection 1: T568B Connection 2: T568B Crossed
signal pair color signal pair color
1 BI_DA+ 2
white/orange
BI_DB+ 3
white/green
2 BI_DA- 2
orange
BI_DB- 3
green
3 BI_DB+ 3
white/green
BI_DA+ 2
white/orange
4 BI_DC+ 1
blue
BI_DD+ 4
white/brown
5 BI_DC- 1
white/blue
BI_DD- 4
brown
6 BI_DB- 3
green
BI_DA- 2
orange
7 BI_DD+ 4
white/brown
BI_DC+ 1
blue
8 BI_DD- 4
brown
BI_DC- 1
white/blue

 

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