The JBX05279 4m 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents a cost-effective, high-performance solution for enterprise networking applications. As a passive DAC cable, it eliminates the power consumption and heat generation associated with active solutions, making it an environmentally responsible choice for large-scale deployments. Key Technical Specifications: - Length: 4 meters (optimal for rack-to-rack connectivity) - Data Rate: 40Gbps - Cable Type: Passive direct attach copper with plastic jacketing - Gauge: 28AWG twinax construction - Connectors: QSFP+ to QSFP+ (copper-based for superior conductivity) - Form Factor: QSFP+ compatible with Extreme Networks infrastructure Performance & Compliance: This cable is fully qualified to IEEE 802.3ba standards and SFF-8436 specifications, ensuring compatibility across enterprise-grade networking equipment. RoHS, TUV, and UL certifications confirm compliance with EU directive 2002/95/EC and international safety requirements. Operating temperature range of 0°C to 70°C provides flexibility for various data center environments. Compatibility & Value: The JBX05279 replaces multiple OEM part numbers including Extreme Networks 40G-DACP-QSFP4M, 10313-4M, 40GB-C04-QSFP, and AA1404031-E6-4M. This compatibility makes it an excellent upgrade or replacement option. Custom brand programming is available for organizations requiring white-label solutions. Why Choose This Cable: Passive DAC cables offer superior performance-to-cost ratio compared to active alternatives. The 4-meter length is ideal for data center configurations without the latency concerns of longer runs. Quick deployment with minimal cable management complexity. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. Applications: Perfect for data center east-west traffic, high-performance computing clusters, storage network interconnects, and enterprise server-to-switch connectivity. Ideal for organizations standardizing on Extreme Networks infrastructure seeking reliable, cost-effective 40Gbps solutions.