The 400G QSFP-DD to 2 x 200G QSFP56 Passive Direct Attach Copper (DAC) Breakout Cable is a high-performance, cost-effective interconnect solution designed to enable seamless connectivity between next-generation 400G switches and existing 200G infrastructure. This passive copper cable provides a reliable and efficient way to split a single 400Gb/s QSFP-DD port into two independent 200Gb/s QSFP56 connections, making it ideal for data center environments where gradual network upgrades are required. Constructed with high-quality twinaxial copper cables, this breakout solution ensures low-latency, high-speed data transmission while maintaining excellent signal integrity. The cable supports a reach of up to 3 meters, making it suitable for short-range connections within racks or between adjacent racks in high-density deployments. The passive design eliminates the need for external power, reducing overall energy consumption and simplifying deployment compared to active optical solutions. The 400G QSFP-DD end of the cable is compliant with the QSFP-DD MSA (Multi-Source Agreement) standard, featuring an 8-lane electrical interface that operates at 56 Gbps per lane (PAM4 modulation) to deliver an aggregate bandwidth of 400Gb/s. On the other end, the two 200G QSFP56 connectors each utilize a 4-lane interface running at 56 Gbps per lane, effectively splitting the 400G signal into two 200G channels. This breakout configuration allows data center operators to maximize port utilization by connecting a single high-speed switch port to two downstream devices, such as servers, storage systems, or legacy switches with QSFP56 interfaces. Compatible with a wide range of networking equipment from major vendors, this passive DAC breakout cable is an excellent choice for hyperscale data centers, cloud computing environments, and high-performance computing (HPC) applications. It supports protocols such as 400G Ethernet (IEEE 802.3bs) and 200G Ethernet (IEEE 802.3cd), ensuring seamless interoperability in mixed-speed networks.
