The JBX05409 2.5m 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents a cost-effective, high-performance solution for enterprises and data centers requiring ultra-high-speed network infrastructure. This Brocade-compatible cable delivers exceptional value for organizations investing in 40GB Ethernet deployments without compromising on quality or reliability. **Technical Specifications:** Designed to IEEE 802.3ba and SFF-8436 standards, this passive DAC cable operates at 40GB data rates with QSFP+ connectors on both ends. The 30AWG twinax copper conductors provide optimal signal integrity over the 2.5-meter distance, making it ideal for data center rack interconnections and switch-to-switch communications. Operating temperature range of 0-70°C ensures reliable performance in controlled server environments. **Construction & Durability:** The cable features professional-grade twinax copper construction with protective plastic jacketing that resists abrasion and provides excellent bend radius characteristics. This passive design eliminates external power requirements, reducing operational costs and simplifying deployment. The robust construction ensures longevity in high-density rack environments. **Compliance & Safety:** Fully RoHS and TUV certified, this cable meets EU Directive 2002/95/EC requirements. It complies with all relevant safety standards and environmental regulations, making it suitable for enterprise deployments requiring strict compliance verification. **Compatibility & Performance:** Direct replacement for Brocade OEM part number 40G-QSFP-C-0251, this cable integrates seamlessly into existing Brocade infrastructure. The 2.5-meter length strikes an optimal balance, providing sufficient reach for interconnects while minimizing signal degradation. Perfect for modular network expansion and equipment relocations. **Value Proposition:** Offering enterprise-grade performance at competitive pricing, this cable includes a 90-day limited warranty. With free standard shipping on orders exceeding $99 and rapid dispatch from multiple U.S. locations (Danville, CA and Beaufort, SC), customers benefit from reliable logistics and exceptional support. **Applications:** Ideal for high-performance computing clusters, cloud infrastructure, storage area networks, and financial trading systems where low-latency, high-bandwidth connectivity is mission-critical. Compatible with all QSFP+ equipped switches, routers, and network interface cards supporting 40GBASE-CR4 protocol.