The industry-standard Cisco Small Form-Factor Pluggable (SFP) Gigabit Interface Converter is a hot-swappable input/output device that plugs into a Gigabit Ethernet port or slot, linking the port with the network. SFPs can be used & interchanged on a wide variety of Cisco products & can be intermixed in combinations of 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-ZX, or 1000BASE-BX10-D/U on a port-by-port basis. 1000BASE-SX SFP for Multimode Fiber Only The 1000BASE-SX SFP, compatible with the IEEE 802.3z 1000BASE-SX standard, operates on 50 ?m multimode fiber links up to 550 m & on 62.5 ?m Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m.