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12 Appendix B Cabling Guidelines
Kingston Technology Company KNS800/WG User’s Guide – Rev.B01
UTP 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-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 for premise wiring, stick to one wiring standard. Mixing
T568A and T568B wiring schemes may cause or lead to potential problems.
Fig. B-1 4-Pair T568A Wiring Fig. B-2 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-4 4-Pair T568A Wiring Table B-5 4-Pair T568B Wiring
1 2 3 4 5 6 7 8
Pair 2
Pair 3
Pair 1
Pair 4
T568A
1 2 3 4 5 6 7 8
Pair 3
Pair 2
Pair 1
Pair 4
T568B