The JBX05076 3-meter 400GBASE-CR8 QSFP-DD direct attach copper (DAC) breakout cable represents the cutting edge of high-speed data center interconnect technology. Engineered as a drop-in replacement for Arista's CAB-D-8S-400G-3M, this passive breakout DAC cable enables cost-effective migration from 400G single-lane connections to multi-lane 100G configurations, facilitating efficient network scaling without requiring active transceivers or additional power consumption. Technical Specifications & Performance: This cable features a QSFP-DD (Quad Small Form-factor Pluggable Double Density) connector on the source end and breaks out into eight individual SFP56 (Small Form-factor Pluggable 56) connectors, enabling 1:8 port density expansion. The 28AWG twinax copper construction provides optimal signal integrity across the full 3-meter span, qualifying to IEEE ETC 400GBASE-CR8 specifications for reliable 400Gbps throughput. Operating across 0-70°C, the cable accommodates diverse data center environments from cooled server rooms to edge deployments. Compliance & Certification: Fully RoHS/ELV compliant per EU directive 2002/95/EC, with TUV and UL safety certifications, this cable meets enterprise-grade standards for procurement and regulatory requirements. The passive design eliminates thermal concerns and failure points associated with active components, delivering superior reliability for mission-critical applications. Applications & Use Cases: Ideal for hyperscale data centers, cloud infrastructure providers, and enterprise networks requiring high-density 400G aggregation with flexible breakout capabilities. Perfect for ToR (Top-of-Rack) switches consolidating multiple 100G connections into unified 400G uplinks, or distributing 400G capacity across legacy 100G equipment during infrastructure modernization. Shipping & Support: Quick-ship availability from Danville, CA and Beaufort, SC locations with free standard shipping on orders exceeding $99. 90-day limited warranty included. Custom brand programming available for enterprise deployments requiring OEM labeling. Choose JBX05076 for proven 400G breakout connectivity combining Arista compatibility, passive reliability, and enterprise-class certifications at competitive pricing.