LevelOne 1.25G Single-mode SFP Transceiver (10km)- Add a 1000Base-LX connection to LevelOne switchs with mini GBIC/SFP ports-Connect switches up to 10km away with each other-TTL signal detect indicator-Compliant with IEEE802.3z Gigabit Ethernet-Easy to install and hot-swappable-Differential LVPECL input and output-Single 3.3V power supply-Duplex LC connector