The JBX05839 0.5m 100GBASE-CR4 QSFP28 Passive Direct Attach Copper Cable represents the optimal solution for organizations requiring high-speed, reliable data center interconnectivity. Engineered to Palo Alto Networks specifications, this cable integrates seamlessly into existing security and networking infrastructure while delivering enterprise-grade performance. **Technical Excellence:** Built to IEEE 802.3bj specifications and QSFP28 MSA standards, this cable provides 100GB data transmission with exceptional signal fidelity. The 30AWG twinax copper construction ensures optimal electrical performance while minimizing signal degradation over short distances. Operating across a wide temperature range (0-70°C), it maintains consistent performance in diverse data center environments. **Superior Design & Construction:** The passive DAC architecture eliminates active components, reducing power consumption and simplifying deployment. High-quality copper connectors with precise gold-plating ensure reliable connections and repeated mating cycles. Durable plastic jacketing protects against physical damage while maintaining flexibility for installation in tight spaces. **Compliance & Certification:** Fully RoHS/ELV compliant per EU directive 2002/95/EC, this cable meets international environmental and safety standards. TUV and UL certifications confirm adherence to rigorous quality benchmarks. The cable is engineered to replace Palo Alto Networks OEM part number PAN-QSFP28-DAC-0.5M, providing an economical alternative without compromising performance. **Ideal Applications:** Perfect for rack-to-rack connections, switch-to-server links, and storage area network (SAN) implementations. The 0.5m length provides flexibility for both high-density deployments and standard 19-inch rack installations. **Value & Warranty:** Offering exceptional cost-effectiveness compared to active optical cables, backed by a 90-day limited warranty. Free standard shipping on orders exceeding $99 with rapid fulfillment from multiple distribution centers.