Guantai 100/1000Mbps Gigabit Ethernet to Fiber Optic Media Converter Single-Mode SC Fiber,Up to 20Km,Chassis mountable -1Pair Meet IEEE802.3z/AB 1000Base-T standard and 1000Base-SX/LX Extends fiber optic distance: Single mode up to 20Km Gigabit Ethernet 10/100/1000M adaptive mode Ethernet ports support full / half duplex mode, 2U chassis mountable