Fibre backbones are an essential part of most large data cabling installations, and 10 Gigabit Ethernet provides massive bandwidth for this purpose. However, the distance rules for 10G transmission across fibre are not simple. For example you can transmit across 300m of OM3 cable using a low cost 10GBase-SR interface or you can cover 240m across lesser grade fibre using the much more expensive 10GBase-LX4 interface. I've found an excellent page on Wikipedia that makes it fairly clear. See http://en.wikipedia.org/wiki/10_Gigabit_Ethernet.
Alan Bullen
Lynx Networks plc
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