The Cisco WS-G5484 1000BASE-SX GBIC operates on ordinary multimode fiber (MMF) optic link spans up to 1815 feet (550 m) long.
The industry-standard Cisco Gigabit Interface Converter (GBIC) is a hot-swappable input/output device that plugs into a Gigabit Ethernet port or slot, linking the port with the network.