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TOPIC: Cabling concepts

Cabling concepts 12 years 7 months ago #2528

  • Kn1ght
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I was reading your site about cable. Cat 5 Cat 3 exc.

You are talking about twisting, but I didn't get the concept behind twisting. Why the more twists the faster the cable?

I'm stupid I know... But hey I'm at this site so I'm trying to get un-stupid. :)

Knight the confused.
Thanks
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Re: Cabling concepts 12 years 7 months ago #2530

  • tfs
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The twisting is to prevent crosstalk between pairs of wires.
In fact, one of the main differences between Cat5 and Cat3 cable is avoidance of crosstalk and other interference. Cat5 is much more tightly twisted than Cat3, and the twists are more tightly controlled to be uniform in distance

Crosstalk is an issue whereby signals traveling along one pair of wires interfere with those on another. The more twists per inch of cabling, the less susceptible the wiring is to both EMI and crosstalk.

The above is from a couple of articles.

Here is a page from this site that talks about it under network/cabling - www.firewall.cx/cabling_utp.php
Thanks,

Tom
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Re: Cabling concepts 12 years 7 months ago #2531

  • Kn1ght
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could you repost? Because your link isn't working and I can't find that sentance anywhere!
Thanks
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Re: Cabling concepts 12 years 7 months ago #2532

  • Chris
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There was an unwanted dot '.' at the end of the link tfs posted. I've fixed the link so you can now click on it and go directly to the page!

Cheers,
Chris Partsenidis.
Founder & Editor-in-Chief
www.Firewall.cx
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Re: Cabling concepts 12 years 7 months ago #2533

  • Kn1ght
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what is EMI?
Thanks
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Re: Cabling concepts 12 years 7 months ago #2535

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There are 2 types of electrical interference:

1) EMI - Electomagnetic Interference

2) RFI - Radio Frequency Interference

This is interference by electrical motors, power cables, flourescent lights, transformers, radio transmitters etc.
Thanks,

Tom
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