Kingston Technology KNE24TX/RS, KNE12TX/RS, KNE8TX/RS manual Cable Wiring Standards, T568A

Appendix B Cabling Guidelines 15

Cable Wiring Standards

There are two governmental agencies: the Electronic Industry Association (EIA) and the Telecommunications Industry Association (TIA), which set the standard for all cable wiring requirements for commercial buildings.

With the advent of 100Mb/s networking products, it is best to use higher quality CAT 5 cables like Belden or Helix as well as CAT 5-compliant patch panels, patch cables, and connectors while following the EIA/TIA wiring standards. 100 Ω UTP CAT 5 type cables use 4-pair UTP wiring.

Refer to the illustrations below for 4-pair 100Mb/s wiring using either T568A (Fig. B-1) or T568B (Fig. B-2) wiring standards. Both T568A and T568B wiring is compatible with 10BASE-T and 100BASE-TX and require no special configurations, but stick to one wiring standard. If your building is wired for T568A, any changes or additions must be done with the T568A wiring scheme. Mixing the T568A and T568B wiring schemes will not work.

Pair 2	Pair 3
Pair 3 Pair 1 Pair 4	Pair 2 Pair 1 Pair 4

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

T568A

Fig. B-1. 4-Pair T568A Wiring

T568A		Pairs	Strand		Solid
Pin 1		Pair 3	Blue	White/Green
Pin 2	Pair 3		Orange	Green/White
Pin 3	Pair 2		Black		White/Orange
Pin 4		Pair 1	Red	Blue/White
Pin 5		Pair 1	Green	White/Blue
Pin 6		Pair 2	Yellow	Orange/White
Pin 7		Pair 4	Brown	White/Brown
Pin 8		Pair 4	White	Brown/White

Table. B-4. 4-Pair T568A Wiring

T568B

Fig. B-2. 4-Pair T568B Wiring

T568B		Pairs		Strand		Solid
Pin 1	Pair 2			Black		White/Orange
Pin 2	Pair 2		Yellow		Orange/White
Pin 3	Pair 3			Blue	White/Green
Pin 4	Pair 1			Red	Blue/White
Pin 5	Pair 1		Green		White/Blue
Pin 6	Pair 3		Orange		Green/White
Pin 7	Pair 4		Brown		White/Brown
Pin 8	Pair 4			White	Brown/White

Table B-5. 4-Pair T568B Wiring

KNE24TX/RS User’s Guide - Rev. A01 Kingston Technology Company