The JBX04997 400GBASE-CR8 QSFP-DD Direct Attach Copper Breakout Cable represents the pinnacle of modern data center connectivity solutions. Designed specifically for enterprises requiring ultra-high-speed network infrastructure, this 0.5-meter passive breakout cable delivers 400GB throughput efficiency while maintaining the cost-effectiveness and simplicity that passive DAC technology provides. **Technical Specifications & Design** This cable features a QSFP-DD (Quad Small Form Factor Pluggable Double Density) connector on the source end, breaking out to two standard QSFP56 connectors for flexible port distribution. The 30AWG twinax construction ensures optimal signal integrity and minimal electromagnetic interference, critical for sustained 400GB performance. With dimensions of 12x12x2mm and a compact 0.5-meter length, installation in high-density data centers becomes seamless and efficient. **Performance & Reliability** Qualified to ETC 400GBASE-CR8 and QSFP-DD MSA specifications, this cable guarantees compatibility with Arista switches and comparable networking infrastructure. The passive design eliminates power consumption while reducing heat generation—a crucial advantage in thermally-constrained environments. Operating temperature range of 0-70°C ensures reliable performance across diverse facility conditions. **Compliance & Certification** Fully RoHS and ELV compliant, meeting EU directive 2002/95/EC standards, this cable supports modern sustainability requirements. TUV and UL certifications validate safety and performance across critical infrastructure deployments. Custom brand programming availability allows seamless integration with existing asset management systems. **Applications & Use Cases** Ideally suited for switch-to-switch connections, storage array interfaces, and high-performance computing clusters, this breakout cable handles mission-critical data transfers. Organizations requiring 400G connectivity without the complexity of active cables benefit significantly from this passive solution. **Value Proposition** Replacing the OEM CAB-D-2Q-400G-0.5M part number, this compatible cable delivers identical performance at competitive pricing. Ships from multiple US locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. The 90-day limited warranty provides confidence in long-term deployment reliability.