40GBASE-CSR4, 4 lanes, 850 nm MMF transceiver module
Cisco QSFP-40G-CSR4, Fiber optic, 40000 Mbit/s, QSFP+, LC, 50/125,62.5/125 µm, 15748" (400 m)
Cisco QSFP-40G-CSR4. SFP transceiver type: Fiber optic, Maximum data transfer rate: 40000 Mbit/s, Interface type: QSFP+. Certification: MSA