The JBX05427 2.5m 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents an essential component for modern data center and enterprise network infrastructure. This high-performance cable delivers 40 gigabits per second throughput, making it ideal for bandwidth-intensive applications requiring rapid data transmission between network switches, servers, and storage systems. **Technical Specifications & Construction:** Built with premium 30AWG twinax copper conductors and durable plastic jacketing, this passive DAC cable combines performance with longevity. Measuring 2.5 meters in length with compact dimensions (12x12x3), it fits seamlessly into dense networking environments. The cable features dual QSFP+ connectors, providing a secure, tool-free connection mechanism. **Compliance & Certification:** Fully compliant with IEEE 802.3ba standards and SFF-8436 specifications, this cable meets rigorous industry requirements. RoHS/ELV and EU directive 2002/95/EC certifications ensure environmental responsibility. TUV and UL safety certifications guarantee reliable operation across demanding conditions with operating temperature range of 0-70°C (32-158°F). **Compatibility & Integration:** Designed specifically for Ruckus network infrastructure, this cable replaces OEM part numbers E40G-QSFP-C-0251 and E40G-QSFP-QSFP-P-0251, ensuring drop-in compatibility with existing systems. Its passive design eliminates the need for power consumption, reducing operational costs and heat generation in data centers. **Advantages Over Alternatives:** Passive DAC cables offer superior advantages compared to active cables or fiber optics. Lower cost, minimal power draw, and shorter latency make them optimal for short-range, high-speed interconnections. Unlike optical solutions, no specialized training is required for installation. **Warranty & Support:** Backed by a comprehensive 90-day limited warranty, with custom brand programming available for enterprise deployments. Ships from strategically located warehouses in California and South Carolina with free standard shipping on orders exceeding $99, ensuring quick delivery and cost-effective procurement for network infrastructure projects.