The JBX05276 40GBASE-CR4 QSFP+ passive direct attach copper cable represents the ideal solution for organizations seeking reliable, cost-effective high-speed network connectivity. This 4-meter twinax cable is specifically engineered to support 40 Gigabit Ethernet applications while maintaining the superior performance characteristics required in modern data center environments. Key Features & Specifications: Construction: Premium 28AWG twinax copper with protective plastic jacketing ensures durability and optimal signal transmission. The passive design eliminates active components, reducing heat generation and power consumption compared to alternative solutions. Connectivity: Dual QSFP+ connectors provide seamless integration with Cisco-compatible switching infrastructure, supporting direct server-to-switch and switch-to-switch connections without additional adapters. Performance Standards: Fully qualified to IEEE 802.3ba specifications and SFF-8436 standards, delivering consistent 40GB data rates with minimal latency. The cable operates reliably across a 0-70°C temperature range, accommodating diverse deployment scenarios. Compliance & Safety: Meets RoHS and EU directive 2002/95/EC requirements, ensuring environmental responsibility. UL and TUV certifications confirm safety and quality standards. Applications & Use Cases: Data Center Interconnects: Perfect for connecting high-performance servers, storage systems, and switches within data center environments where speed and reliability are paramount. Server Networking: Enable 40GB connectivity for server-to-switch configurations, supporting demanding workloads and high-bandwidth applications. Network Upgrades: Cost-effective alternative to active optical cables for organizations upgrading legacy infrastructure while maintaining equipment compatibility. Comparative Advantages: Unlike active optical cables, this passive DAC requires no power consumption or cooling management, reducing operational complexity and total cost of ownership. The robust copper construction provides superior EMI shielding compared to some competing products. Warranty & Support: Backed by a comprehensive 90-day limited warranty and available for custom brand programming. Ships from strategically located warehouses in Danville, CA and Beaufort, SC, ensuring rapid delivery. Compatibility: Direct replacement for OEM part numbers QSFP-H40G-CU4M and MA-CBL-40G-4M, guaranteeing seamless integration with existing Cisco infrastructure. Contact our technical team for compatibility verification with your specific configuration.