What is difference between coaxial cable and twist

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 The answer is in the name of the cables:coaxial cable has an outer an inner part which share a common axis (hence the name co-axial). Usually the outer part acts as a screen to protect the inner part from electrical interference.

Twisted pair cable consists of a number of pairs of cables. Each pair is twisted together and is used for a single signal; one side of the pair sends the normal signal, the other sends the inverted version. At the receiving end, the normal and inverted signals are subtracted, because any electrical noise is likely to affect each of the pair of cables equally (because they are coupled together by being twisted), subtracting the two should produce a noise free resulting signal.
There are variations; sometimes each pair is screened - improving the noise immunity, particularly from other signals in the same cable - sometimes the entire bundle of cables is screened. Occassionally, both the individual pairs are screened and the bundle is also screened.


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