The JBX05021 0.5m 400GBASE-CR8 QSFP-DD to 4x QSFP28 Direct Attach Copper (DAC) breakout cable represents a critical infrastructure component for modern data center deployments. As organizations increasingly demand higher bandwidth capabilities, this cable provides an elegant solution for bridging next-generation 400G connections with proven 200G-capable equipment. Product Specifications: Designed with meticulous attention to network standards, this cable conforms to IEEE 802.3bs specifications and QSFP-DD MSA (Multi-Source Agreement) protocols. The 30AWG twinax construction provides optimal signal integrity over its 0.5-meter reach, making it ideal for direct server-to-switch or switch-to-switch connections within equipment cabinets. Technical Advantages: As a passive DAC cable, the JBX05021 requires no additional power or active electronics, eliminating potential points of failure and reducing operational costs. The 400GBASE-CR8 standard ensures compatibility with next-generation switching hardware while the quad QSFP28 breakout capability enables flexible network topology configurations. Each cable undergoes rigorous testing to maintain IEEE 802.3bs compliance. Compliance & Quality Assurance: This product meets stringent environmental standards with RoHS and ELV compliance, alongside TUV and UL safety certifications. Manufactured in Vietnam and China, each unit carries a 90-day limited warranty, providing peace of mind for enterprise deployments. Applications: Ideal for data center upgrades, high-performance computing clusters, and enterprise networking environments where bandwidth density and cost efficiency matter. Compatible with Arista networking platforms, it serves as a direct replacement for the CAB-D-4Q-200G part number. Shipping & Support: Shipped from facilities in Danville, CA and Beaufort, SC with free standard shipping on orders exceeding $99. Custom brand programming is available for enterprise customers requiring specific identification or documentation requirements. This cable delivers exceptional value for network professionals implementing advanced 400G infrastructure while maintaining backward compatibility and operational efficiency.