Move 400G capacity where it matters most with a breakout cable designed for dense data center switching. This 4 m active copper assembly converts one QSFP-DD 400GBASE-CR8 port into four 100GBASE-CR4 QSFP connections, giving infrastructure teams a direct path to fan out bandwidth across adjacent devices, leaf-spine tiers, or top-of-rack aggregation points. Active copper is the right choice when you want predictable short-reach performance without the cost and power overhead of optical transceivers. The cable keeps the signal path simple, reduces component count, and supports clean port utilization in environments where every rack unit and every watt count. For Arista-compatible deployments, it offers a practical way to connect mixed-speed infrastructure while preserving the operational consistency expected in enterprise networks. At 4 m, this model is suited to rack-to-rack and within-row runs where reach matters but long-haul optics are unnecessary. It is a focused interconnect for teams standardizing on 400G uplinks while maintaining 100G downstream connectivity for servers, storage, or adjacent switches.