TP-Link TL-FC311A-20 Gigabit WDM Media Converter 10/100/1000 Mbps RJ45 to 1000 Mbps Single-mode SC WDM Bi-Directional Fiber Converter, 1× Gigabit SC Port, 1× Gigabit RJ45 Port (Auto MDI/MDIX), Full-duplex, Tx:1550 nm, Rx:1310 nm, Up to 20 km