The Cisco industry-standard 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 and interchanged on a wide variety of Cisco products and can be intermixed in combinations of 1000BASE-SX, 1000BASE-LX/LH, or 1000BASE-ZX on a port-by-port basis.The GLC-SX-MM, 1000BASE-SX SFP operates on ordinary multimode fiber optic link spans of up to 550 meters in length.