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Appendix B Cabling Guidelines 11
KNExTX/WG User’s Guide - Rev. A00 Kingston Technology Company
Appendix B Cabling Guidelines
UTP Cable Wiring
100BASE-TX unshielded twisted-pair cables can be wired as "Straight-
Through" or, in some cases, "Crossover" depending on the application. For
workstations connected to a hub, use "Straight-Through' wiring illustrated in
Table B-1. In some instances, you may want to use "Crossover" wiring
illustrated below in Table B-2.
"Straight-Through" Crossover”
Cable Wiring Cable Wiring
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
4, 5, 7, 8
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
Not Used
Pin Number Pin Number
1 (TRX +)
2 (TRX -)
3 (RCV +)
6 (RCV -)
4, 5, 7, 8
3 (RCV +)
6 (RCV -)
1 (TRX +)
2 (TRX -)
Not Used
Pin Number Pin Number
Table B-1. Straight-Through Wiring Table B-2. Crossover Wiring
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
100BASE-TX networks, Category (CAT) 5 should 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.
Refer to the illustrations on page 12 for standard 100BASE-TX wiring and 4-
pair 100Mbit wiring using either T568A (Table B-3) or T568B (Table B-4)
wiring standards. Both T568A and T568B wiring configurations are
compatible with 10BASE-T and 100BASE-TX and require no special hardware
configurations. However, it is highly recommended that only one wiring
scheme be used in premise wiring to avoid potential problems.