The JBX05277 4-meter 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents a sophisticated solution for enterprise-grade data center networking. Designed specifically for Dell infrastructure compatibility, this cable delivers exceptional performance for demanding applications requiring high-bandwidth, low-latency connections. **Technical Specifications:** This passive direct attach copper (DAC) cable utilizes premium 28AWG twinax copper construction, engineered to support 40 Gigabit Ethernet transmission standards. The cable measures 4 meters in length, providing optimal reach for typical rack-to-rack and switch-to-server configurations within data centers. Its compact 12x12x4mm profile minimizes space requirements while maintaining superior signal integrity. **Performance & Compatibility:** Fully compliant with IEEE 802.3ba and SFF-8436 standards, this cable guarantees reliable 40Gbps data transmission. The QSFP+ to QSFP+ connectors feature copper contacts designed for maximum conductivity and durability. Compatible with Dell switching equipment and other standards-compliant platforms, it replaces OEM part number 02-SSC-0382-4M. **Key Advantages:** As a passive DAC solution, this cable requires zero power consumption—a significant advantage over active alternatives in power-constrained environments. The copper twinax design provides superior electromagnetic shielding and noise rejection, ensuring clean signal transmission in complex networking environments. Operating across a wide temperature range (0-70°C), the cable maintains consistent performance in various deployment scenarios. **Certifications & Compliance:** The cable meets strict RoHS and EU ELV directive requirements, demonstrating environmental responsibility without compromising performance. TUV and UL safety certifications confirm compliance with international safety standards, making it suitable for global deployments. **Use Cases:** Ideally suited for hyperscale data centers, high-performance computing clusters, storage area networks, and enterprise server interconnects. The 4-meter length bridges distances between network switches and servers in standard data center rack configurations. **Shipping & Support:** Manufactured in Vietnam and China with strict quality controls, the cable ships from Danville, CA and Beaufort, SC locations, ensuring rapid delivery. All orders over $99 qualify for free standard shipping. Each purchase includes a comprehensive 90-day limited warranty protecting your investment.