The JBX05279 4m 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents professional-grade network connectivity designed specifically for Extreme Networks environments. This robust twinax cable delivers exceptional performance for demanding data center and enterprise applications. Technical Specifications: With a length of 4 meters and 28AWG copper twinax construction, this cable is engineered to support 40GB data transmission rates while maintaining signal integrity over extended distances. The QSFP+ form factor provides industry-standard connectivity compatible with modern switch architectures, while the passive design eliminates active electronic components that can introduce latency or require additional power management. Compliance & Certifications: This cable meets IEEE 802.3ba specifications and qualifies under SFF-8436 standards, ensuring compatibility with certified networking equipment. Full RoHS, TUV, and UL certifications demonstrate compliance with international safety and environmental standards, while EU Directive 2002/95/EC (RoHS) compliance ensures reduced hazardous substance usage. Performance & Reliability: The passive DAC design delivers direct signal transmission without active electronics, ensuring minimal latency and maximum throughput. Operating temperature range of 0-70°C provides dependable performance across standard data center environments. The 90-day limited warranty protects your investment while custom brand programming is available for enterprise deployments. Applications: Ideal for hyperscale data centers, enterprise switch interconnections, server-to-switch connections, and high-speed storage area networks. This cable replaces multiple OEM part numbers including 40G-DACP-QSFP4M and 10313-4M, providing versatile compatibility across Extreme Networks platforms. Value Proposition: Choose this passive DAC cable for cost-effective, power-efficient 40GB connectivity without sacrificing performance or reliability. Free standard shipping on orders over $99 makes this an economical choice for network infrastructure upgrades.