The JBX05276 40GBASE-CR4 QSFP+ passive direct attach copper cable represents a reliable, cost-effective solution for enterprise data center connectivity. This 4-meter cable is specifically engineered to meet the demanding requirements of high-speed network infrastructure while maintaining compatibility with Cisco systems. Technical Specifications: Designed to IEEE 802.3ba standards and SFF-8436 form factor specifications, this cable supports 40GB data rates with minimal latency. The 28AWG twinax copper construction provides superior signal integrity over the 4-meter distance, making it ideal for intra-rack and adjacent-rack connections in data centers. Each connector is precision-engineered with copper contacts to ensure consistent performance across thousands of connect/disconnect cycles. Key Advantages: Passive DAC technology eliminates the complexity and cost associated with active cables. Unlike active cables requiring power consumption and heat dissipation, passive DACs operate without external power, reducing operational costs and environmental impact. The compact form factor and lightweight design simplify installation in congested server racks. Compliance & Certification: Full RoHS (EU directive 2002/95/EC) and ELV compliance ensures environmental responsibility and regulatory adherence across global markets. TUV and UL safety certifications guarantee product reliability and safety standards. Operating temperature range of 0–70°C provides flexibility for diverse data center environments. Compatibility & Replacement: Direct replacement for Cisco OEM part numbers QSFP-H40G-CU4M and MA-CBL-40G-4M, ensuring seamless integration into existing Cisco infrastructure. Custom brand programming is available for enterprises requiring specific branding or documentation. Warranty & Support: 90-day limited warranty provides peace of mind on your investment. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. Ideal Applications: • Data center switch-to-server connectivity • High-performance computing clusters • Storage network infrastructure • Cisco-based network deployments • Cost-sensitive environments requiring passive connectivity solutions