StarTech.com Extreme Networks 10057 Compatible SFP Module - 1000BASE-BX-U - 1 GbE Gigabit Ethernet BiDi Fiber (SMF) - Extreme Networks 10057 Compatible Transceiver - 1000BASE-BX WDM SFP+ (1 Gbps) - 1 Gigabit BiDi Module - 1310nmTx/1490nmRx Single Mode (SMF) - 10 km (6.2 mi) - LC Connector & DDM - Hot-Swappable / MSA Compliant - Lifetime Warranty