The JBX05411 2.5m Cisco Compatible 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents an essential component for modern data center infrastructure requiring high-speed, reliable network connectivity. This premium-grade DAC cable is engineered to meet the demanding requirements of enterprise environments while offering exceptional value. Key Features and Specifications: This passive direct attach copper cable operates at 40 gigabits per second, supporting the 40GBASE-CR4 standard across compatible Cisco equipment and other IEEE 802.3ba-qualified devices. The 30AWG Twinax copper construction provides optimal signal integrity while maintaining flexibility for installation in constrained spaces. The cable measures 2.5 meters in length, offering versatility for mid-range connections in rack-mounted configurations. Performance and Reliability: As a passive DAC solution, this cable eliminates the power consumption and cooling requirements associated with active electronics, making it ideal for energy-efficient data center operations. The copper connectors ensure low-latency transmission of critical network signals, supporting demanding applications including virtual machine migration, real-time data analytics, and high-frequency trading environments. Compliance and Certifications: This cable meets stringent international standards including RoHS (Restriction of Hazardous Substances), EU Directive 2002/95/EC, TUV, and UL certifications. These certifications guarantee environmental safety and electrical reliability across diverse deployment scenarios. Compatibility and Application: Designed for seamless integration with Cisco infrastructure, this cable directly replaces OEM part numbers QSFP-H40G-CU2-5M and MA-CBL-40G-250CM, minimizing compatibility concerns. It supports 40Gbps data transmission across temperature ranges of 0°C to 70°C, ensuring consistent performance in various environmental conditions. Value Proposition: With custom brand programming available and backed by a 90-day limited warranty, this cable offers flexibility for enterprise branding while providing reliable support. The 2.5-meter length bridges the gap between short patch cables and longer trunk cables, making it ideal for intra-rack and adjacent-rack connections. Manufactured in Vietnam and China with quality controls, shipped from multiple U.S. locations (Danville, CA and Beaufort, SC), this product ensures rapid delivery with free standard shipping on orders exceeding $99. Maintenance and Care: Store cables at controlled temperatures and avoid excessive bending or tension on connectors. Maintain clean, dust-free connector interfaces to ensure optimal signal quality. Regular inspection of the copper connectors and twinax jacketing preserves long-term performance and reliability.