StarTech.com Cisco QSFP-40G-CSR4 Compatible QSFP+ Module, 40GBASE-SR4, 40GbE Multimode Fiber MMF Optic Transceiver, 40GE Gigabit Ethernet QSFP+ MPO 300m, 850nm DDM, Cisco Firepower ASR9000 - Lifetime Warranty (QSFP-40G-CSR4-ST) - QSFP+ transceivermodul - 40GbE