Ethernet EIA/TIA-568A/B


PinPairSignalWireColor
T568AT568B10/100 Base-T1000 Base-TT568AT568B
132TX+BI_DA++/tip
white/green

white/orange
232TX-BI_DA--/ring
green

orange
323RX+BI_DB++/tip
white/orange

white/green
411BI_DC+-/ring
blue

blue
511BI_DC-+/tip
white/blue

white/blue
623RX-BI_DB--/ring
orange

green
744BI_DD++/tip
white/brown

white/brown
844BI_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
PinConnection 1: T568AConnection 2: T568B
signalpaircolorsignalpaircolor
1BI_DA+3
white/green
BI_DB+2
white/orange
2BI_DA-3
green
BI_DB-2
orange
3BI_DB+2
white/orange
BI_DA+3
white/green
41
blue
1
blue
51
white/blue
1
white/blue
6BI_DB-2
orange
BI_DA-3
green
74
white/brown
4
white/brown
84
brown
4
brown

Gigabit T568A crossover
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover
PinConnection 1: T568AConnection 2: T568A Crossed
signalpaircolorsignalpaircolor
1BI_DA+3
white/green
BI_DB+2
white/orange
2BI_DA-3
green
BI_DB-2
orange
3BI_DB+2
white/orange
BI_DA+3
white/green
4BI_DC+1
blue
BI_DD+4
white/brown
5BI_DC-1
white/blue
BI_DD-4
brown
6BI_DB-2
orange
BI_DA-3
green
7BI_DD+4
white/brown
BI_DC+1
blue
8BI_DD-4
brown
BI_DC-1
white/blue

Gigabit T568B crossover
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover
PinConnection 1: T568BConnection 2: T568B Crossed
signalpaircolorsignalpaircolor
1BI_DA+2
white/orange
BI_DB+3
white/green
2BI_DA-2
orange
BI_DB-3
green
3BI_DB+3
white/green
BI_DA+ 2
white/orange
4BI_DC+1
blue
BI_DD+4
white/brown
5BI_DC-1
white/blue
BI_DD-4
brown
6BI_DB-3
green
BI_DA-2
orange
7BI_DD+4
white/brown
BI_DC+1
blue
8BI_DD-4
brown
BI_DC-1
white/blue


Ethernet over twisted pair standards

NameStandardSpeed (Mbit/s)Bandwidth (MHz)Cable req. per 100m
10BASE-T802.3i 19901010Cat 3
100BASE-TX802.3u 199510031.25Cat 5
1000BASE-T802.3ab 1999100062.5Cat 5e
2.5GBASE-T802.3bz 20162500100Cat 5e
5GBASE-T5000200Cat 6
10GBASE-T802.3an 200610000400Cat 6A
25GBASE-T802.3bq 2016250001000Cat 8
40GBASE-T400001600Cat 8