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8P8C

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See modular connector for numbering of the pins in these 8P8C modular connectors.

The assignments of wire pairs to plug and jack pins are as follows:

T568A/B RJ45 Wiring
Pin T568A Pair T568B Pair Wire T568A Color T568B Color Pins on plug face (jack is reversed)
1 3 2 tip Pair 3 Tip
white/green stripe
Pair 2 Tip
white/orange stripe
2 3 2 ring Pair 3 Ring
green solid
Pair 2 Ring
orange solid
3 2 3 tip Pair 2 Tip
white/orange stripe
Pair 3 Tip
white/green stripe
4 1 1 ring Pair 1 Ring
blue solid
Pair 1 Ring
blue solid
5 1 1 tip Pair 1 Tip
white/blue stripe
Pair 1 Tip
white/blue stripe
6 2 3 ring Pair 2 Ring
orange solid
Pair 3 Ring
green solid
7 4 4 tip Pair 4 Tip
white/brown stripe
Pair 4 Tip
white/brown stripe
8 4 4 ring Pair 4 Ring
brown solid
Pair 4 Ring
brown solid


Note that the only difference between T568A and T568B is that pairs 2 and 3 (orange and green) are swapped. Both standards wire the pins "straight through", i.e., pins 1 through 8 on one end are connected to pins 1 through 8 on the other end. Also, the same sets of pins are paired in both standards: pins 1 and 2 form a pair, as do 3 and 6, 4 and 5 and 7 and 8. The different pairs in an ethernet wire have different impedances, so an orange pair can not be connected directly to a green pair. In order to connect two different pairs together, a hub or switch or higher level piece of equipment like a router must be placed between the two. Splicing two cables together will result in improper termination and reflections will occur in the line. These reflections will cause errors and lower the available throughput in the wire.

UTP cables terminated according to T568A on one end and T568B on the other end are known as Ethernet crossover cables.


6P6C

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Holding the connector in your hand tab side down with the cable opening toward you, the pins are numbered 1–6, left to right.

Position Pair T/R ± RJ11 RJ14 RJ25 Twisted pair colors 25-pair colors Old colors[a] German colors[b] Australian colors
1 3 T + T3 Pair 3 Wire 1 Cat 5e/6
white/green
Pair 4 Wire 1
white/green
Pair 3 wire 1
white
Pair 3 wire 1
pink
Pair 3 wire 1
orange
2 2 T + T2 T2 Pair 2 Wire 1 Cat 5e/6
white/orange
Pair 2 Wire 1
white/orange
Pair 2 Wire 1 Old
black
Pair 2 ext. bell
green
Pair 2 ext. bell
red
3 1 R - R1 R1 R1 Pair 3 Wire 2 Cat 5e/6
blue
Pair 1 Wire 2
blue/white
Pair 1 Wire 2 Old
red
Pair 1 wire A
white
Pair 1 wire B
blue
4 1 T + T1 T1 T1 Pair 1 Wire 1 Cat 5e/6
white/blue
Pair 1 Wire 1
white/blue
Pair 1 Wire 1 Old
green
Pair 1 wire B
brown
Pair 1 wire A
white
5 2 R - R2 R2 Pair 3 Wire 1 Cat 5e
orange
Pair 2 Wire 2
orange/white
Pair 2 Wire 2 Old
yellow
Pair 2 ground
yellow
Pair 2 ground
black
6 3 R - R3 Pair 1 Wire 1 Cat 5e
green
Pair 3 Wire 2
green/white
Pair 3 Wire 2
blue
Pair 3 wire 2
gray
Pair 1 Wire 1 Old
green
  • ^[a] While the old solid color code was well established for pair 1 and usually pair 2, there are several conflicting conventions for pair 3 (and sometimes even pair 2). The colors shown above were taken from a vendor of "silver satin" flat 8-conductor phone cable that claims to be standard. 6-pair solid (old) bellwire cables previously used by the Bell System use white for pair 3 tip but some vendor's cable may substitute orange for white. At least one other vendor of flat 8-conductor cable uses the sequence blue, orange, black, red, green, yellow, brown and white/slate.
  • ^[b] This color scheme originates in the (withdrawn) national standard DIN 47100. The scheme shown here is the correct color code for interfacing with the RJ connector standards.


--Reverend Loki (talk) 21:20, 17 August 2011 (UTC)