The JBX04998 0.5-meter 400GBASE-CR8 QSFP-DD to dual QSFP56 passive direct attach copper cable represents a cost-effective, high-performance networking solution for modern data centers and enterprise environments. This cable functions as a breakout DAC, enabling flexible connectivity by splitting a single 400GB QSFP-DD port into two independent 200GB QSFP56 channels. **Technical Specifications:** This passive copper twinax cable utilizes 30AWG gauge conductors with durable plastic jacketing to ensure reliable signal transmission. Measuring just 0.5 meters, it's optimized for compact rack deployments and equipment connections. The cable meets stringent ETC 400GBASE-CR8 standards and QSFP-DD MSA (Multi-Source Agreement) specifications, guaranteeing compatibility with qualified networking equipment. **Cisco Compatibility:** As a direct equivalent to Cisco's OEM part QDD-2Q200-CU0-5M, this cable seamlessly integrates with Cisco switching infrastructure and qualified third-party equipment. The QSFP-DD connector provides robust mating cycles and secure connections, while the dual QSFP56 endpoints deliver independent 200GB channels. **Compliance & Safety:** Manufactured in Vietnam and China, this cable adheres to RoHS (2002/95/EC) and ELV directives, ensuring environmental compliance and material safety. TUV and UL certifications validate electrical safety and performance standards. Operating reliably between 0-70°C, the cable suits diverse data center climates and cooling scenarios. **Benefits:** Passive DAC technology eliminates external power requirements and reduces heat generation compared to active alternatives. Short 0.5-meter length minimizes signal degradation while providing flexibility in equipment positioning. The cable supports full 400GB throughput with low latency, essential for high-frequency trading, cloud computing, and storage infrastructure. **Applications:** Perfect for connecting 400G-enabled switches to servers, storage arrays, and network appliances. Ideal for hyperscale data centers, financial institutions, content delivery networks, and research facilities requiring maximum bandwidth efficiency. The breakout functionality accommodates mixed 200GB and 400GB network architectures during infrastructure transitions. **Shipping & Support:** Ships from multiple US locations (Danville, CA and Beaufort, SC) with free standard shipping on orders over $99. Backed by a 90-day limited warranty. Custom brand programming available for enterprise deployments. This proven DAC solution delivers reliable 400GB connectivity at enterprise-grade standards.