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UTP Cabling and Installation Practices

Wiring Standards

Before purchasing connecting hardware, it is important to decide which wiring standard you are going to follow. The wiring standard designates which pair of wires from the horizontal cabling connects to which pin on the RJ-45 connector. The governing body for cable wiring standards is EIA/TIA, which stands for two organizations: The Electronic Industries Association and The Telecommunications Industry Association. Their preferred method of cable wiring is T568-A mainly because it is directly compatible with two pair voice and Token Ring systems utilizing six position connectors. The alternative is T568-B, which conforms to the AT&T 258A wiring standard and is more popular in the U.S. This method is directly compatible with AT&Ts' phone systems.

In any case as you will see from the guides bellow the only difference is that the data carrying pairs are reversed for send and receive. No matter which system you use be sure that all of your components end to end use the same wiring scheme.

T568-A Wiring Guide
RJ - 45
RJ - 45
1 White / Green 1
2 Green / White 2
3 White / Orange 3
4 Blue / White 4
5 White / Blue 5
6 Orange / White 6
7 White / Brown 7
8 Brown / White 8

T568-B Wiring Guide
RJ - 45
RJ - 45
1 White / Orange 1
2 Orange / White 2
3 White / Green 3
4 Blue / White 4
5 White / Blue 5
6 Green / White 6
7 White / Brown 7
8 Brown / White 8

Care must be taken when terminating the horizontal wiring at the connecting hardware so as to maintain the highest level of performance possible. ANSI/TIA/EIA 568-A specifies the 110 or Krone, contact as the preferred method for connecting wires from the horizontal cabling to the connecting patch panels.

These contacts pierce the insulation to make contact with the wire underneath. To get consistently reliable terminations, use a 110 punch down tool, which terminates only one wire at a time. In addition, the twisting of the unshielded twisted pairs is critical to maintaining the electrical and performance specifications of the cable and should remain twisted as far as possible up to the termination point.

Additional Information

  • To avoid stretching, pulling tension should not exceed 110N (25lbF) for four pair cables
  • Installed bend radii should not exceed four times the cable diameter for horizontal UTP cables and ten times the cable diameter for multi-pair backbone UTP cables.
  • Avoid cable stress, as caused by: cable twist during installation tension in suspended cable runs tightly cinched cable ties or staples tight bend radii
  • Horizontal cables should be used with connecting hardware and patch cords ( or jumpers ) of the same performance or higher category.

Note: Installed UTP cabling shall be classified by the least performing component in the circuit.


A2 Building cable

100 Pair Telephony Cables - Colour Codes


The codes in this table have the following meanings:

BU = Blue WH = White
OG = Orange RD = Red
GN = Green VT = Violet
BN = Brown YE = Yellow
GY = Grey BK = Black



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