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Twisted-pair wiring – Linksys DSSXFXST User Manual

Page 17

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Twisted-Pair Wiring

There are different grades, or categories, of twisted-pair cabling. Category

5 is the most reliable and widely compatible, and is required for Fast

Ethernet networks.

You can buy Category 5 cabling that is pre-crimped, or you can crimp

your own. Category 5 cables can be purchased or crimped as either

straight-through or crossed. A Category 5 cable has 8 thin, color-coded

wires inside that run from one end of the cable to the

other. Only wires 1, 2, 3, and 6 are used by Ethernet

networks. In a straight-through cable, wires 1, 2, 3,

and 6 at one end of the cable are also wires 1, 2, 3,

and 6 at the other end. In a crossed cable, the order

of the wires change from one end to the other: wire 1

be-comes 3, and 2 becomes 6 and vice versa.

The color code for the 4 wires should be as follows: Wire
1

, white with an orange stripe; Wire 2, orange; Wire 3,

white with a green stripe; Wire 6, green. The other four

wires have to be connected as follows: Wire 4, blue;
Wire 5

, white with a blue stripe; Wire7, white with a

brown stripe, Wire 8, brown.

To figure out which wire is wire number 1, hold the cable so that the end

of the plastic RJ-45 tip (the part that goes into a wall jack first) is facing

away from you. Flip the clip so that the copper side faces up (the springy

clip will now be parallel to the floor).When looking down on the coppers,

wire 1 will be on the far left.

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