On 10/07/2017 14:02, wbrown at e1b.org wrote: > ~3 x 10**8 m/s > > More importantly, what is the speed of light in a fiberoptic connection? ~0.66c > Speed of electrons in copper wire? Individual electrons move *very* slowly - it's the electric *field* that moves at between 0.5c and 1c. https://en.wikipedia.org/wiki/Velocity_factor cheers, Ray