Cisco 400G QSFP-DD Active Optical Cable, 25M | QSFP-DD, 400G — QDD-400-AOC25M=

Keep 400G links clean, compact, and predictable across longer in-rack and adjacent-rack distances. Cisco’s 25 m QSFP-DD active optical cable is designed for high-density environments where port count, airflow, and cable management matter as much as throughput. By integrating the optical path into a single assembly, it reduces the number of components in the link and simplifies deployment compared with discrete transceiver-and-fiber combinations. This cable is a strong fit for top-of-rack to end-of-row connectivity, spine-leaf fabrics, and other environments where 400G transport must remain consistent under tight physical constraints. The QSFP-DD form factor supports modern high-bandwidth switching platforms, while the active optical design helps maintain signal integrity over longer distances than passive copper options can support. For teams standardizing on Cisco infrastructure, this cable offers a straightforward way to extend 400G connectivity without adding unnecessary complexity to the rack. It is especially useful where cable routing, thermal efficiency, and predictable link behavior are part of the design requirement. When the network needs 400G performance over 25 m, this is the kind of component that keeps the physical layer aligned with the rest of the architecture. Ideal For Connect top-of-rack and end-of-row switches in 400G fabrics Link adjacent racks where passive copper cannot reach Support spine-leaf interconnects in high-density data centers Standardize Cisco 400G cabling across enterprise switching deployments Why This Product 1 25 m reach for longer rack-to-rack runs 2 Integrated active optical design reduces link complexity 3 QSFP-DD on both ends for compatible 400G ports 4 Better fit than passive copper for extended 400G distances