The JBX05211 2m 40GBASE-CR4 QSFP+ to 4x SFP+ Direct Attach Copper Cable represents an essential infrastructure component for modern data centers and enterprise networks. This passive breakout DAC cable delivers exceptional performance and reliability for Extreme Networks compatible systems, enabling seamless 40GB connectivity without the overhead of active transceivers. **Technical Specifications & Performance:** This cable meets IEEE 802.3ba specifications and delivers consistent 40GB data rates across its 2-meter length. The 30AWG twinax copper construction provides superior signal integrity and minimal attenuation, ensuring reliable transmission of low-voltage network signals. With an operating temperature range of 0-70°C (32-158°F), the cable adapts to diverse data center environments while maintaining optimal performance. **Design & Construction:** The passive breakout design eliminates the need for active signal processing, reducing power consumption and operational costs compared to active alternatives. The robust copper cable with plastic jacketing provides excellent durability and protection against environmental factors. The QSFP+ to 4x SFP+ configuration allows you to effectively aggregate or distribute bandwidth, making it ideal for both uplink and downlink applications. **Compliance & Certification:** Fully RoHS and ELV compliant, meeting EU Directive 2002/95/EC standards. TUV and UL safety certifications ensure the cable meets rigorous industry safety requirements, giving you confidence in deployment across critical infrastructure. **Applications & Use Cases:** Ideal for data centers, cloud computing environments, high-frequency trading firms, and enterprise networks requiring reliable high-speed connectivity. The 2-meter length accommodates standard rack configurations and switch-to-switch connections. Compatible with Extreme Networks equipment, this cable replaces multiple OEM part numbers including 40G-DACP-QSFP4SFP2M and 10GB-4-C02-QSFP. **Value & Support:** Included 90-day limited warranty provides peace of mind. Free standard shipping on orders over $99. Custom brand programming available for enterprise deployments. Ships from US locations (Danville, CA and Beaufort, SC) for rapid delivery.