Are the electrons in a metal cable not also traveling with the speed of light?!
Why is there so much more bandwidth possible with fiber wiring?
Is the metal cable more prone to external influences? Is the signal getting worse and disturbing itself when trying to achieve higher frequency / bandwidth?
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One reason is interference. Wires act like antennas and can recieve interference from nearby radio transmitters, sparking wires, motors, current passing through nearby wires, etc. Fiber optics eliminate all that because it is non-conductive.
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