The JBX05347 0.5-meter 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents an essential component for modern high-speed networking infrastructure. Specifically engineered for Ruckus compatibility, this professional-grade twinax cable delivers consistent 40Gbps performance in demanding data center and enterprise networking environments. **Technical Specifications & Features:** This passive DAC cable utilizes 30AWG twinax copper construction with quality plastic jacketing to ensure signal integrity and durability. The dual QSFP+ connectors provide secure, reliable connections without the complexity of active components. Manufactured to IEEE 802.3ba standards, it guarantees compliance with industry specifications for 40 Gigabit Ethernet applications. The 0.5-meter length is ideal for short-range interconnects between switches, servers, and network appliances. **Compliance & Certification:** Fully RoHS and ELV compliant, this cable meets EU Directive 2002/95/EC environmental standards. Safety certifications include RoHS, TUV, and UL approval, ensuring safe operation in professional environments. The cable replaces OEM part numbers E40G-QSFP-C-00501 and E40G-QSFP-QSFP-P-00501, making it a cost-effective alternative to manufacturer-branded cables. **Performance Advantages:** Passive DAC technology eliminates power consumption while maintaining superior performance compared to fiber alternatives at short distances. Operating temperature range of 0-70°C ensures reliable functionality in varied data center conditions. The twinax copper design provides excellent EMI shielding and signal quality for latency-sensitive applications. **Ideal Applications:** Perfect for Ruckus switch interconnections, server-to-switch connections, network device clustering, and data center infrastructure upgrades. Suitable for enterprises prioritizing cost-effective, high-speed connectivity solutions. **Customer Support:** Backed by a 90-day limited warranty and free standard shipping on orders over $99. Custom brand programming available for enterprise bulk orders. Ships from convenient U.S. locations (Danville, CA and Beaufort, SC).