T568A and T568B termination – TIA/EIA-568 – Wikipedia
Posted by jpluimers on 2017/08/04
Note to self: looking at the various patch cables, it looks like most manufacturers prefer T568B over T568A. Not sure why. I adopted T568B to avoid any confusion.
As I always forget the images on FTP/STP/UTP wiring in both connectors and outlets and forget which standard is T568A and T568B: T568A and T568B termination – TIA/EIA-568 – Wikipedia:
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
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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