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18 Appendix B Cabling Guidelines
Kingston Technology Company EtheRx User’s Guide - Rev. B00
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. For
unshielded twisted-pair (UTP) cabling, Category (CAT) 3, 4 or 5 can be used.
With the advent of 100Mbit network products, it is best to use higher quality
CAT 5 cables like Belden or Helix as well as CAT 5-compliant patch panels
and connectors while following the EIA/TIA wiring standards. 100 Ohm
UTP/STP CAT 3, 4 & 5 type cables use 4-pair UTP wiring. Standard 10BASE-
T uses 2-pair UTP wiring.
Refer to the illustrations below for standard 2-pair 10BASE-T wiring (see Fig
B-4), and 4-pair 100Mbit wiring using either T568A (Fig. B-5) or T568B (Fig.
B-6) wiring standards. Both T568A and T568B wiring is compatible with
10BASE-T and require no special configurations, but mixing the T568A and
T568B wiring schemes will not work.
1 2 3 4 5 6 7 8
Pair 2
Pair 1
10BASE-T
Fig. B-4 2-Pair UTP Wiring
1 2 3 4 5 6 7 8
Pair 2
Pair 3
Pair 1
Pair 4
T568A
Fig. B-5 4-Pair T568A Wiring
1 2 3 4 5 6 7 8
Pair 3
Pair 2
Pair 1
Pair 4
T568B
Fig. B-6 4-Pair T568B Wiring