This Gigabit module is intended for use with Catalyst 4000 and 5000 series switches from Cisco. The GBIC is a hot-swappable input/output device that plugs into a Gigabit Ethernet port, linking the port with the fiber-optic network. The 1000BASE-SX SC connector operates on ordinary multi-mode fiber optic cabling and spans of up to 550m in length.