QDD-400G-LR8-S — QSFP-DD 400 Gbps

The Cisco QDD-400G-LR8-S is a QSFP-DD 400 Gbps transceiver compliant with the IEEE 400GBASE-LR8 standard, optimized for intra-datacenter links up to 10 km over single-mode fiber. It uses 8 optical lanes in duplex mode with an LC (UPC) connector to achieve 400 Gbps of aggregated throughput. Its standard thermal range of 0 to 75 °C makes it compatible with the vast majority of server and switch environments.

The QDD-400G-LR8-S targets 400G spine-leaf architectures requiring optical connectivity over 10 km, particularly for connecting rooms or buildings within a campus. Unlike ZR solutions rated for 40 km, it prioritizes density and energy efficiency for short-to-medium reach deployments. Genuine Cisco hardware, manufacturer warranty.