Description Cisco QDD-4ZQ100-CU2M Compatible is a 2-meter (7ft) passive direct attach copper (DAC) breakout cable designed to bridge a single 400G QSFP-DD port with four 100G QSFP56 ports. This 28AWG cable provides a high-density, low-latency solution for short-range interconnects without the power consumption associated with optical transceivers. It is specifically optimized for Cisco networking environments, making it an ideal choice for top-of-rack deployments and high-speed switch-to-server connectivity.