> > > > All the explanations I've read for why we're limited to 1 Gigabit only > seems to explain "why multi-mode can't transmit the same bandwidth at > the same distance as single-mode", not "why multi-mode can never reach > a speed of 10G". Reading through theory of multi-modal dispersion, I > can't find a concrete reason why 10G modules at this distance *can* > never exist. > > Proof by Wikipedia:
http://en.wikipedia.org/wiki/Fiber-optic_communication#Bandwidth-distance_product The signal is going to smear as a function of the length. The longer the length the more the smear. If the signal smears evenly across 1/2 of the period ( 1/frequency ) it becomes unreadable. Wikipedia says that 10G will work up to 300m on multimode. (Again wikipedia says its true so it must be.) http://en.wikipedia.org/wiki/Multi-mode_optical_fiber
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