StarTech.com Cisco QSFP-40G-LR4-S Comp. QSFP+ Module - 40GBASE-LR4 - 40GE Gigabit Ethernet 40GbE Single Mode Fiber SMF Optic Transceiver - Cisco QSFP-40G-LR4-S Compatible QSFP+ - 40GBASE-LR4 40 Gbps - 40GbE Module - 40GE Gigabit Ethernet QSFP+ 1270nm to 1
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