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18 Appendix B Cabling Guidelines
Kingston Technology Company KNE24TP/RS User’s Guide - Rev. A01
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 wiring using either T568A (Fig. B-4)
or T568B (Fig. B-5) 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.
1 2 3 4 5 6 7 8
Pair 2
Pair 3
Pair 1
Pair 4
T568A
Fig. B-4. 4-Pair T568A Wiring
1 2 3 4 5 6 7 8
Pair 3
Pair 2
Pair 1
Pair 4
T568B
Fig. B-5. 4-Pair T568B Wiring
T568A Pairs Strand Solid T568B Pairs Strand Solid
Pin 1 Pair 3 Blue White/Green Pin 1 Pair 2 Black White/Orange
Pin 2 Pair 3 Orange Green/White Pin 2 Pair 2 Yellow Orange/White
Pin 3 Pair 2 Black White/Orange Pin 3 Pair 3 Blue White/Green
Pin 4 Pair 1 Red Blue/White Pin 4 Pair 1 Red Blue/White
Pin 5 Pair 1 Green White/Blue Pin 5 Pair 1 Green White/Blue
Pin 6 Pair 2 Yellow Orange/White Pin 6 Pair 3 Orange Green/White
Pin 7 Pair 4 Brown White/Brown Pin 7 Pair 4 Brown White/Brown
Pin 8 Pair 4 White Brown/White Pin 8 Pair 4 White Brown/White
Table. B-6. 4-Pair T568A Wiring Table B-7. 4-Pair T568B Wiring