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I'm in the middle of a course on networking and communications. So far I found the physical layer of communication the most interesting. There's one thing that bothers me though. Why is it impossible to have a noiseless channel??

When the Nyquist channel capacity was discussed, it was emphasized strongly that no such thing as a noiseless channel actually exists. But isn't it possible to remove all sources of noise so that noise is pretty much negligible?

Oloff Biermann
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    "Pretty much negligible" isn't "noiseless", just like 0.01 K isn't absolute zero. – user2357112 Apr 05 '16 at 20:26
  • That makes sense. So just like absolute 0, 0 noise cannot be achieved? What would be the typical source(s) of noise that cannot be eliminated? – Oloff Biermann Apr 05 '16 at 22:49
  • Stuff like quantum mechanical uncertainty effects or the ever-present possibility that a construction worker will stick a backhoe through your cables. (That counts as noise.) – user2357112 Apr 05 '16 at 22:54

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