The JBX05292 40GBASE-CR4 QSFP+ passive direct attach copper cable is a premium connectivity solution designed for demanding network infrastructure requirements. This 4-meter cable seamlessly integrates with Ruckus-compatible systems while delivering exceptional performance in data center, enterprise, and high-performance computing environments. **Technical Excellence:** Constructed with 28AWG twinax copper and protective plastic jacketing, this cable meets IEEE 802.3ba specifications for 40 Gigabit Ethernet transmission. The passive DAC (Direct Attach Copper) design eliminates active components, reducing power consumption and heat generation while maintaining signal integrity over the 4-meter distance. QSFP+ connectors on both ends provide a standard form factor compatible with a wide range of networking equipment. **Compliance & Certification:** This cable adheres to international standards including RoHS (Restriction of Hazardous Substances) and ELV directives, ensuring environmental responsibility. Safety certifications from TUV and UL validate its reliability and safety for enterprise deployments. The harmonization code 8544.42.9090 confirms proper classification for global trade. **Performance Characteristics:** Operating reliably between 0-70°C (32-158°F), the JBX05292 maintains consistent performance across diverse environmental conditions. The 4-meter length provides optimal reach for typical data center rack-to-switch interconnections without the latency issues associated with longer cable runs. **Compatibility & Value:** Direct replacement for OEM part numbers E40G-QSFP-C-0401 and E40G-QSFP-QSFP-P-0401, this cable simplifies upgrade and maintenance processes. Custom brand programming is available for organizations requiring personalized labeling. Free standard shipping on orders exceeding $99 enhances overall value, with convenient fulfillment from Danville, CA or Beaufort, SC locations. **Ideal Applications:** Perfect for connecting switches, routers, and network interface cards in virtualized environments, cloud infrastructure, and enterprise data centers. The passive design makes it especially suitable for high-density deployments where space and power constraints are critical considerations. Backed by a 90-day limited warranty, this cable provides confidence in your network infrastructure investment.