The JBX05284 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable is a professional-grade networking solution designed for demanding enterprise and data center applications. This 4-meter cable represents the optimal balance between performance, cost-efficiency, and reliability for high-speed network infrastructure deployments. **Technical Excellence**: Manufactured to strict IEEE 802.3ba standards, this cable delivers consistent 40Gbps data transmission rates with minimal signal degradation. The 28AWG copper twinax construction provides superior electrical characteristics, ensuring optimal signal integrity even in complex network environments. QSFP+ connectors on both ends deliver secure, tool-less connections compatible with Intel and Intel-compatible network equipment. **Passive DAC Advantage**: Unlike active cables requiring external power, this passive DAC solution eliminates power supply dependencies, reducing overall system complexity and operational costs. The passive design delivers exceptional reliability with zero electronic components to fail, making it ideal for mission-critical infrastructure where uptime is paramount. **Compliance & Certification**: Fully RoHS compliant per EU directive 2002/95/EC, this cable meets environmental and safety standards required for modern data centers. TUV and UL certifications confirm adherence to rigorous safety protocols, while compliance with SFF-8436 specifications ensures interoperability across diverse network equipment ecosystems. **Optimal Length & Design**: The 4-meter length strikes the ideal balance for rack-to-rack connections and short-to-medium distance interconnections within data center environments. Featuring compact dimensions and durable plastic jacketing, the cable withstands frequent handling and deployment scenarios common in high-density networking environments. **Thermal Resilience**: Operating reliably across 0-70°C temperature ranges, this cable maintains performance consistency from climate-controlled data centers to equipment-dense server rooms experiencing thermal stress. **Value Proposition**: The JBX05284 replaces OEM part number XLDACBL4, offering significant cost savings compared to brand-name alternatives while maintaining equivalent performance specifications. With 90-day limited warranty and US warehouse availability ensuring rapid shipping, this solution delivers enterprise-class reliability at competitive pricing. **Applications**: Perfect for switch-to-server connections, storage array interconnections, high-performance computing clusters, and virtualization infrastructure requiring reliable 40Gbps connectivity without active power management overhead.