Description The Cisco QDD-400-CU1M compatible 1m DAC cable provides a high-performance 400G passive link for short-reach networking via QSFP-DD ports. Built with high-quality passive copper twinax, it ensures stable 400Gb/s signal integrity with ultra-low latency and zero power consumption. This assembly is an ideal solution for intra-rack equipment patching and high-bandwidth switch-to-server connectivity.