Cisco SD-AR1K-QDD9400G 400G QSFP-DD FR4 Transceiver | Data Center Optics — SD-AR1K-QDD9400G

Sustain 400G connectivity in space-constrained data center fabrics with Cisco SD-AR1K-QDD9400G. This QSFP-DD transceiver is designed for 400G-FR4 deployments, delivering high-bandwidth optical transport over single-mode fiber for switch-to-switch and leaf-spine architectures. Its QSFP-DD form factor supports the density modern platforms demand, while the FR4 optical design helps extend 400G links across the distances typically required inside enterprise and cloud data centers. For teams standardizing on Cisco optics, this module fits into environments where link reliability, port efficiency, and predictable interoperability matter more than commodity pricing. Choose this transceiver when the cost of a failed link is higher than the cost of the right optic. It is built for production networks that need consistent 400G performance, clean deployment alignment, and the operational confidence that comes from using a Cisco-qualified optical module. Ideal For Deploy 400G switch-to-switch links in leaf-spine data center fabrics Upgrade aggregation layers that require higher port density and throughput Standardize Cisco-qualified optics across enterprise switching platforms Support high-capacity interconnects in cloud and colocation environments Why This Product 1 Cisco-branded optic for qualified infrastructure deployments 2 400G FR4 design for high-capacity single-mode links 3 QSFP-DD form factor for dense port utilization 4 Better fit for production fabrics than generic compatibility optics