StarTech.com Cisco QSFP-40G-LR4-S Comp. QSFP+ Module - 40GBASE-LR4 - 40GE Gigabit Ethernet 40GbE Single Mode Fiber SMF Optic TransceiverExperience enterprise grade performance with the StarTech Cisco QSFP 40G LR4 S Comp. QSFP+ Module, a Cisco compatible 40GBASE LR4 transceiver designed for high density data centers, university campuses, and mission critical backbones. This QSFP+ module delivers reliable, long haul 40 Gigabit Ethernet over single mode fiber (SMF) with 1270 nm to 1330 nm wavelengths, enabling four parallel 10 Gbps lanes that converge into a robust 40 Gbps link.