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10base-T is pretty ancient now Copper ethernet back then had a pretty limited range in terms of cable length. Even now I think its only ~350m max depending on specs. They'd use these at either end of a fibre link to connect equipment over longer distances. They sell similar ones now that do 100mbit, 1gbit, etchttp://www.dealextreme.com/p/10-100-1000mbps-ethernet-fiber-media-converter-transceiver-silver-105793