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T568A and T568B termination – TIA/EIA-568 – Wikipedia

Posted by jpluimers on 2017/08/04

As I always forget the images on UTP wireing in both connectors and outlets and forget which standard is T568A and T568B: T568A and T568B termination – TIA/EIA-568 – Wikipedia:

Pin T568A Pair T568B Pair 10BASE-T 100BASE-TX 1000BASE-T Signal ID Wire T568A Color T568B Color Pins on plug face (socket is reversed)
1 3 2 TX+ DA+ tip Pair 3 Tip
white/green stripe
Pair 2 Tip
white/orange stripe
Rj45plug-8p8c.png
2 3 2 TX- DA- ring Pair 3 Ring
green solid
Pair 2 Ring
orange solid
3 2 3 RX+ DB+ tip Pair 2 Tip
white/orange stripe
Pair 3 Tip
white/green stripe
4 1 1 DC+ ring Pair 1 Ring
blue solid
Pair 1 Ring
blue solid
5 1 1 DC- tip Pair 1 Tip
white/blue stripe
Pair 1 Tip
white/blue stripe
6 2 3 RX- DB- ring Pair 2 Ring
orange solid
Pair 3 Ring
green solid
7 4 4 DD+ tip Pair 4 Tip
white/brown stripe
Pair 4 Tip
white/brown stripe
8 4 4 DD- 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.

For cross-over cables (used less and less because of Auto MDI-X which is standard in 10000BASE-T) this is slightly different Appendix B: Ethernet Crossover Cables – Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation – Cisco [WayBack]:

Four Twisted-Pair Crossover Cable Schematics for 10/100/1000 and 1000BASE-T GBIC Module Ports

3a.gif

3c.gif

There are some nice colour coded wiring diagrams at Tech Stuff – LAN Wiring and Pinouts [WayBack] for both straight wiring [WayBack] and crossed wiring [WayBack]:

All work fine for CAT5, CAT5E and CAT6.

–jeroen

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