The JBX05291 4-meter 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents the ideal solution for high-speed networking in enterprise data centers and Palo Alto Networks environments. This meticulously engineered passive DAC cable delivers exceptional performance for distance-sensitive applications without requiring active signal conditioning. **Technical Excellence:** Built to IEEE 802.3ba specifications, this cable supports full 40GB/s data rates with minimal signal degradation. The 28AWG twinax copper construction provides optimal impedance matching and superior electromagnetic shielding. The QSFP+ to QSFP+ connectors ensure tool-free installation and maximum compatibility with modern switching infrastructure. **Key Performance Benefits:** - Zero-latency direct copper connection eliminates processing delays - Passive design requires no power consumption or heat generation - 4-meter length ideal for rack-to-rack connectivity within data centers - Cost-effective alternative to fiber optic solutions for short-range links - Durable plastic jacketing provides mechanical protection and flexibility **Compliance & Certifications:** Fully compliant with RoHS, TUV, and UL safety standards, this cable meets EU directive 2002/95/EC requirements. Manufactured in Vietnam and China, it undergoes rigorous quality testing to ensure reliability. **Operating Specifications:** Operates reliably between 0-70°C (32-158°F), accommodating both ambient and elevated data center temperatures. The cable dimensions of 12x12x4 provide space-efficient routing in dense installation environments. **Compatibility & Support:** Direct replacement for Palo Alto Networks part number PAN-QSFP-CU-4M with identical pinout and performance characteristics. Ships from dual locations (Danville, CA and Beaufort, SC) for rapid deployment. Backed by a 90-day limited warranty covering manufacturing defects. **Use Cases:** Perfect for ToR (Top-of-Rack) switch interconnections, server-to-storage fabric connectivity, and high-performance computing clusters requiring low-latency data transmission. Organizations upgrading to 40G infrastructure without fiber deployment will appreciate the immediate cost savings and installation simplicity. Order with confidence knowing you're receiving enterprise-grade networking infrastructure with proven reliability in demanding production environments.