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While the majority of 1Gb environments will use RJ-45, there are some instances where cable paths need to go longer distances. SFP SX transceivers support distances up to 550 meters, SFP LX transceivers support distances up to 10 kilometers, and SFP ZX transceivers support distances up to 80 kilometers.

IBM SFP RJ45 Transceiver IBM Part # 81Y1618, EB29*	Connector: RJ45 Speed: 1Gb Distance: 100m Cable: Cat5e Copper
IBM SFP SX Transceiver IBM Part # 81Y1622, EB2A*	Connector: SFP Speed: 1Gb Distance: Up to 550m Cable: Optical
IBM SFP LX Transceiver IBM Part # 90Y9424	Connector: SFP Speed: 1Gb Distance: Up to 10km Cable: Optical