QSFP-40G-CSR4 — QSFP+ 40 Gbps

The QSFP-40G-CSR4 from Cisco is a QSFP+ 40 Gbps transceiver designed for short-reach links over multimode fiber (MMF). Compliant with the IEEE 40GBASE-SR4 standard, it uses an MPO-12 (UPC) connector and a parallel fiber architecture to achieve a reach of 400 m — 2.6 times the range of standard SR4 modules, making it an ideal choice for long cross-bay connections or high-density data centers.

This transceiver is aimed at network engineers and data center teams looking to extend 40G links over existing MMF infrastructure without resorting to single-mode fiber. It operates between 0 and 70 °C, ensuring reliability in machine room environments. Genuine Cisco hardware, manufacturer warranty.