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Twisted pair cable?

M

mikeshn

Senior member
I want to do crossover cable. I did some search on the internet, and for that I need twisted pair cable. I cannot understand why the twisted pair cable has : yellow and WHITE, gree and WHITE, and so on. What is the purpose of the White wire? Why it is twisted pair cable.... Can I use just one white cable instead for each wire + white white


 
I don't know much about cabling, but I'd assume they're to act as ground wires. If you have a green and white, you can easily tell which is the ground. If you had two green ones, it would be more difficult to tell the difference.
 
First recommendation: Buy the cable. If you need longer than you can buy, get a long cable for distance, a short crossover cable, and a CAT 5-rated coupler. If you don't know what you're doing, the cable may pass 10 meg packets jus' fine, but fails at 100Mbps.

If you resist the recommendation to buy, and absolutely, positively just gotta make one yourself:

Make sure all the components you buy are specifically rated for Cat5 (5e, 6). Even the little clear plastic plugs.

The color order is CRITICAL to get full-rated performance:

White-orange, Orange, White-green, Blue, White-Blue, Green, White-Brown, Brown. This order is from the top (clip down), looking from the open end of the connector, from left-to-right. There can be no more than 1/2 inch of wires exposed and/or untwisted (that's TOTAL, beginning at the contact-end of the connector).

The pair-ordering above is for an TIA/EIA 568b cable. If you make both ends like this, you have a straight-through cable. If you use the above pair-order on one end, and swap the orange and green pairs on the other end, you have a crossover cable.

Don't try to clip out unused wires...it's a pain-in-the-butt, makes it difficult to thread the wires into the connector correctly, and blows the certification on the cable.

Good Luck

Scott
 
The cable is twisted so that the wires concerned are never parallel to eachother. This minimises crosstalk between the individual wires.
 
The wires are crossed so that the magnetic field surrounding each wire is cancelled out by its partner's wire. This is referred to as Cancellation.
Basically, the wires are twisted to eliminate crosstalk.


Peace.
 
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