The JBX05128 400G QSFP-DD direct attach copper cable represents an essential interconnect solution for modern data center and enterprise network deployments. Engineered to support 400GBASE-CR8 specifications, this 0.5-meter passive DAC cable delivers blazing-fast 400Gbps connectivity without the complexity or power consumption of active optical transceivers. **Technical Excellence & Compatibility** This cable features QSFP-DD connectors on both ends, providing native compatibility with Juniper's QDD-400G-DAC-0P5M specification and other leading networking platforms supporting 400G connectivity. The 30AWG twinax copper construction ensures optimal signal integrity and minimal crosstalk, critical factors for maintaining data reliability at ultra-high speeds. Qualified to the latest ETC 400GBASE-CR8, QSFP-DD MSA, and CMIS standards, this cable meets all industry requirements for next-generation network infrastructure. **Durability & Compliance** Manufactured in Vietnam and China using premium materials, the JBX05128 combines copper conductors with professional-grade plastic jacketing for durability and flexibility in tight rack installations. Full compliance with EU RoHS Directive 2002/95/EC and certifications from TUV and UL ensure environmental responsibility and safety. The cable operates reliably across temperatures from 0-70°C, accommodating diverse data center conditions. **Ideal Use Cases** Perfect for switch-to-switch configurations, server connections, and high-density deployments where active optical solutions prove cost-prohibitive. The compact 0.5-meter length minimizes cable bulk in congested server racks while maintaining signal quality. As a passive solution, it requires no power, reducing operational complexity and cooling requirements. **Value & Support** Offering substantial savings versus active optical alternatives, this cable delivers enterprise-grade performance at a competitive price point. Backed by a 90-day limited warranty and available with custom brand programming options, the JBX05128 provides flexibility for integration into white-label and reseller programs. Ships from convenient U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99.