StarTech.com Extreme Networks 10320 Compatible QSFP+ Module, 40GBASE-LR4, Single Mode (SMF) Fiber, 40GE Gigabit Ethernet QSFP+, LC Connector, 10 km, 1270nm to 1330nm, DDM, 40Gbps QSFP Plus - Lifetime Warranty (10320-ST) - QSFP+ transceivermodul - 40GbE