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This question already has an answer here:

What are throughput and speed limiting factors in an ethernet or any other type of cable which is used for data transmission?

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marked as duplicate by The Photon, PeterJ, Daniel Grillo, Community Oct 28 '15 at 7:55

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  • \$\begingroup\$ This question is rather broad and the answer depends on how much theory you already know; but the short answer is "Shannon-Harley theorem" also known as the "Shannon limit". \$\endgroup\$ – pjc50 Oct 26 '15 at 13:57
  • \$\begingroup\$ @pjc50 - I assume you mean Shannon–HarTley theorem. Maybe upgrade that, with an explanation, to an answer? \$\endgroup\$ – gbulmer Oct 26 '15 at 16:32
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See this article: -

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Taken from here and note that it doesn't just apply to coaxial cable - skin effect and dielectric losses are a real problem for all cables wishing to relay signals at high frequencies.

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