Description Cisco QDD-400-CU1M Compatible 1m (3ft) 400G QSFP-DD Passive DAC Twinax Cable provides a high-speed 400Gbps copper link for short-range Cisco interconnections. It utilizes passive twinax technology to deliver low-latency performance with zero power consumption, ideal for top-of-rack switch-to-server links. This cable is engineered for high signal integrity and seamless compatibility with Cisco 400G networking portfolios.