The JBX05001 400GBASE-CR8 QSFP-DD to 2x QSFP56 direct attach copper (DAC) breakout cable represents a professional-grade solution for modern data center and enterprise network infrastructure requirements. At 1.5 meters in length, this passive breakout cable enables efficient port multiplication, converting a single high-capacity QSFP-DD port into two independent QSFP56 channels without requiring external power or active electronics. **Technical Specifications & Performance:** Built to IEEE ETC 400GBASE-CR8 specifications and QSFP-DD MSA standards, this cable delivers reliable 400GB aggregate bandwidth across short-reach connections. The 30AWG twinax copper construction provides optimal balance between signal integrity and cable flexibility, while the protective plastic jacket guards against environmental interference and physical damage. Operating temperature range of 0-70°C (32-158°F) ensures consistent performance in diverse deployment scenarios. **Connectivity & Compatibility:** The QSFP-DD to dual QSFP56 configuration allows seamless integration with Cisco equipment and certified compatible networking platforms. As a direct replacement for Cisco OEM part number QDD-2Q200-CU1-5M, installation is straightforward with no configuration required. The passive design eliminates compatibility concerns associated with active breakout solutions. **Certifications & Compliance:** This cable meets stringent industry standards including RoHS (EU Directive 2002/95/EC), ELV, TUV, and UL certifications. These qualifications demonstrate commitment to environmental sustainability and electrical safety, making it suitable for enterprise deployments with compliance requirements. **Applications & Use Cases:** Ideal for high-performance computing clusters, data center interconnects, AI/ML infrastructure, cloud service provider networks, and financial trading environments where 400GB connectivity enables rapid data transmission. The breakout configuration is particularly valuable for organizations transitioning from dual 200GB architectures while maximizing existing port density. **Value Proposition:** Compared to active breakout solutions, passive DAC cables offer significant cost savings, lower power consumption, reduced latency, and simplified troubleshooting. The 1.5m length balances flexibility with signal quality, suitable for most rack-to-rack and inline switch connections. Backed by a 90-day limited warranty and expedited shipping from U.S. distribution centers (Danville, CA and Beaufort, SC), the JBX05001 delivers enterprise-reliability without premium pricing.