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Stray Dog Joined: 29 Jan 2001 Posts: 1

I'm in a Networking class, it's a reguired class. The first assignment is to go out on the web and ask this question. What is the number of twist perfoot/perinch of 10baseT category 5 cable? i have gotten three different answers. 20, 20.1, 20.6
even a 1.35. As i have related to others I myself don't understand wht such a question. Maybe it's because tis is not my field.

Thanks,
Alex

Posted: Mon Jan 29, 2001 9:40 am Post subject:

I'm not sure of the exact numbers(yes there is going to be more than one number involved), but here's the story. In a standard 4 pair CAT5 cable you have 5 different twist ratios. Each pair has it's own ratio and then all the pairs are twisted together for another ratio. Why twist the 4 pairs at different ratio? To help defeat crosstalk, the original reason for twisting in the first place. If each pair was twisted exactly the same you would have a better potential for crosstalk. I'm working on find the answer but I don't know when I can get it if I can even find out. The different twist ratios even applies to 25 pair CAT cable. By the way CAT5 is rated for 100baseT no 10baseT!

Rover

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