QDD-400G-VR4 — QSFP-DD 400 Gbps

The Cisco QDD-400G-VR4 is a 400 Gbps QSFP-DD module compliant with the IEEE 400GBASE-VR4 standard, optimized for short-reach links over multimode fiber up to 50 m. Its MPO-12 (APC) connector with parallel fiber cabling distributes the signal across multiple simultaneous lanes. Operating between 0 and 70 °C, it is sized for high-density server rooms.

This module is suited to intra-data center interconnections between spine and leaf switches over a maximum distance of 50 m on MMF, using OM4 or OM5 MPO-12 patch cords. Unlike the QDD-400G-BD BiDi on LC, it requires MPO-12 cabling but provides strict IEEE 400GBASE-VR4 compliance. Genuine Cisco hardware, manufacturer warranty.