The JBX04990 400GBASE-CR8 QSFP-DD Direct Attach Copper (DAC) breakout cable is a specialized high-speed networking solution designed for modern data center infrastructure. This 2-meter cable represents the ideal choice for organizations requiring reliable, cost-effective connectivity between NVIDIA Mellanox switches and network equipment utilizing 400GB port densities. **Technical Specifications:** This cable features passive copper construction with 26AWG twinax copper conductors, providing excellent signal integrity and minimal attenuation across the 2-meter span. The QSFP-DD to 2x QSFP56 configuration enables efficient port breakout, converting a single 400GB connection into dual 200GB streams for flexible network architecture planning. **Performance & Compatibility:** Qualified to ETC 400GBASE-CR8 specifications, this cable operates across the full industrial temperature range of 0-70°C (32-158°F), ensuring consistent performance in various datacenter environments. Full compatibility with NVIDIA Mellanox platforms, including switches like the SN8700 and MSN4700 series, makes integration straightforward. **Advantages Over Alternatives:** Direct Attach Copper (DAC) technology eliminates the need for optical transceivers, reducing total cost of ownership while maintaining superior performance. Unlike active cables, this passive design requires no power consumption, reducing operational costs and heat generation within cramped rack environments. **Compliance & Quality Assurance:** RoHS and ELV compliant manufacturing ensures environmental responsibility, with comprehensive safety certifications including TUV and UL standards. The cable meets EU Directive 2002/95/EC requirements, providing assurance for global deployment. **Applications:** Ideal for hyperscale datacenters, cloud infrastructure providers, HPC clusters, financial trading environments, and enterprise network upgrades where high-speed, low-latency connectivity is mission-critical. **Specifications Summary:** - Length: 2 meters - Data Rate: 400GB - Connector Type: QSFP-DD to 2x QSFP56 - Gauge: 26AWG Twinax - Cable Type: Passive Breakout DAC - Operating Temperature: 0-70°C - Warranty: 90-Day Limited - Free Standard Shipping on Orders Over $99