The JBX06534 400GBASE-CR8 QSFP-DD to 4x QSFP28 Direct Attach Copper cable represents a cost-effective solution for data center networks requiring high-speed interconnectivity. This 4-meter passive breakout DAC cable bridges the gap between next-generation 400G infrastructure and established 100G QSFP28 ecosystem equipment. Technical Specifications and Performance: Designed to IEEE 802.3bs standards, this QSFP-DD breakout cable delivers 400GB aggregate throughput while distributing traffic across four 100GB QSFP28 channels. The 28AWG twinax copper construction minimizes signal degradation over the 4-meter span, ensuring reliable communication in dense server-to-switch or switch-to-switch deployments. The cable maintains full compliance with IEEE 802.3bs, QSFP-DD MSA, and CMIS specifications for seamless integration into standards-compliant networking environments. Application and Use Cases: This breakout cable is particularly valuable for hyperscale data centers, cloud service providers, and enterprise networking teams upgrading from 100G to 400G infrastructure. Rather than replacing entire switch port configurations, organizations can leverage existing 100G-capable equipment by utilizing this breakout solution. Common deployments include top-of-rack switch connections, end-of-row aggregation, and server connectivity in virtualized environments. Compatibility and Integration: The JBX06534 directly replaces Arista's H-D400-4Q100-4M part number, ensuring immediate compatibility with existing Arista configurations. The passive design eliminates compatibility concerns associated with active conversion electronics, providing plug-and-play reliability. RoHS and Safety Compliance: Fully compliant with EU Directive 2002/95/EC (RoHS) and ELV requirements, this cable meets TUV and UL safety certifications. The plastic jacket provides mechanical protection while maintaining flexibility for cable management in space-constrained environments. Warranty and Support: Backed by a 90-day limited warranty with rapid fulfillment from US distribution centers in California and South Carolina. Qualified custom branding options available for OEM partnerships and volume deployments.