Move from a single 400G uplink to four 100G endpoints without adding optical modules or extra patch complexity. This 2 m active copper breakout cable is built for QSFP-DD to QSFP applications where short-reach connectivity, port density, and cost control all matter at the same time. For infrastructure teams standardizing on Arista-compatible hardware, it provides a direct path to connect a 400GBASE-CR8 port to four 100GBASE-CR4 ports using twinax active copper. That makes it a practical fit for leaf-spine fabrics, top-of-rack aggregation, and lab environments where you need deterministic performance over a short distance. Compared with optics-based alternatives, active copper reduces component count and simplifies deployment inside the rack or across adjacent racks. The 2 m length is well suited to tightly managed cable paths, helping preserve airflow and keep service access clean. When you need to fan out bandwidth efficiently while keeping the physical layer straightforward, this cable delivers the right balance of reach, density, and operational simplicity.