Twisting the wires has been around since the first telephones were installed. As an AC signal (voice frequencies) travels in the DC carrier, an effect called mutual induction occurs. This has the effect of creating cross-talk in adjacent pairs. Since voice frequencies are in the 200-3400 Hz bandwidth, only a few twists per foot are needed. Self induction is also present which has the effect of canceling or dropping the signal level.
Enter High speed.
Because of the higher frequencies of ADSL (unknown to most, these are analog like voice, but in the 80 KHz to 1.1 MHz range), tighter twisting was needed. The same effect is in digital signals like ISDN, T-1, etc. There is an effect called Apparent Frequency which mimics an analog signal, and will have the same canceling effect as an analog signal. Therefore, tighter twisting is needed.
Hope this helps,
Telephony facts, analog/digital explained.
See the CNet faces behind the posts.
I think computer viruses should count as life. I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image. - - Stephen W. Hawking
I read that twisted wired for network cable is twisted differently between the pair.
http://www.networkclue.com/hardware/network/termination.php
I quote:
"One thing that I have noticed though is that in CAT5e, the orange and green pairs are twisted tighter than the blue and brown pairs. So do not expect to get the CAT5e quality on the network drop using the split pairs (brown and blue)."
Is this True - If so, Why they do that for?
Secondly I read about Punchdown cable color code, Which use Blue/Blue White as the main color to be used, What is this related to?
Thank You

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