Nortel-networks NB5PLUS4/W Manuel d'utilisateur télécharger pdf (Page 99)

YML754 Rev1 NB5Plus4/W User Guide

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Straight and crossover cable configuration

There are two types of the wiring: Straight-Through Cables and Crossover Cables.

Category 5 UTP/STP cable has eight wires inside the sheath. The wires form four

pairs. Straight-Through Cables has same pinouts at both ends while Crossover Ca-

bles has a different pin arrangement at each end.

In a straight-through cable, wires 1,2,3,4,5,6,7 and 8 at one end of the cable are

still wires 1~8 at the other end. In a crossover cable, the wires of 1,2,3,6 are re-

versed so that wire 1 become 3 at the other end of the cable, 2 becomes 6, and so

forth.

To determine which wire is wire 1, hold the RJ-45 cable tip with the spring clip

facing towards the ground and the end pointing away from you. The copper wires

exposed upwards to your view. The rst wire on the far left is wire 1. You can also

refer to the illustrations and charts of the internal wiring on the following page.

Straight-Through Cabling

Figure 3

Wire Becomes

1 1

2 2

3 3

6 6

Cross-Over Cabling

Figure 4

Wire Becomes

1 3

2 6

3 1

6 2

Note: To prevent loss of signal, make sure that the length of any twisted-pair

connection does not exceed 100 metres.

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 111 112

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Nortel-networks NB5PLUS4/W Manuel d'utilisateur Page 99