The JBX04979 2.5m 400GBASE-CR8 QSFP-DD Direct Attach Copper (DAC) breakout cable represents an industry-standard solution for next-generation data center infrastructure. As a direct replacement for Arista's CAB-D-2Q-400G-2.5M, this cable delivers the proven reliability and performance characteristics that enterprise networks demand. Key Features: This passive breakout DAC cable transforms a single 400G QSFP-DD port into dual 200G QSFP56 connections, optimizing port utilization and network flexibility. The 26AWG twinax copper construction provides superior signal integrity over the 2.5-meter span, critical for zero-loss data transmission in high-speed networking applications. Technical Specifications: The cable is qualified to meet ETC 400GBASE-CR8 specifications and fully compliant with CMIS (Common Management Interface Specification) standards. With an operating temperature range of 0-70°C (32-158°F), it performs reliably in diverse data center environments. RoHS and ELV directive compliance ensures environmentally responsible operation. Advantages: As a passive DAC solution, this cable requires no active electronics or power input, eliminating potential points of failure and reducing total cost of ownership. The design provides excellent return loss and crosstalk performance, essential for maintaining 400GB/s throughput without signal degradation. Applications: Ideal for hyperscale data centers, enterprise switching fabrics, and high-performance computing clusters. Perfect for organizations deploying Arista 400G platforms seeking cost-effective, reliable interconnect solutions. Warranty & Support: Backed by a 90-day limited warranty. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. Custom brand programming available for enterprise deployments.