QDD-400G — Cisco QSFP-DD 400G

The QDD-400G is a Cisco transceiver in QSFP-DD (Double Density) form factor designed for 400 Gigabit Ethernet links. This next-generation module leverages the double row of contacts of the QSFP-DD form factor to multiply port density on compatible Cisco switches, delivering 400G per port in a form factor that remains compatible with QSFP28 bays via adapter.

Adopted in very high-capacity spine architectures, cloud aggregation platforms, and next-generation transport networks, the Cisco QDD-400G forms the foundation of Petabit-scale network infrastructures. It integrates natively into Cisco Nexus and Catalyst chassis supporting 400G. Genuine Cisco hardware, manufacturer warranty.