The JBX05611 100GBASE-CR4 QSFP28 to 4x SFP28 direct attach copper breakout cable represents an essential component for modern data center infrastructure requiring high-speed, reliable network connectivity at 100 gigabit speeds. **Technical Specifications & Performance** This 0.5m passive breakout DAC cable features 30AWG twinax copper conductors with professional-grade plastic jacketing, delivering 100GB throughput without requiring active electronics or external power. The QSFP28 to SFP28 configuration enables flexibility in network architecture, allowing single 100G uplinks to be distributed across four 25G SFP28 ports. IEEE 802.3bj qualified design ensures standards-compliant operation with extensive device compatibility. **Compliance & Reliability** Fully certified under RoHS 2002/95/EC directive with TUV and UL safety approvals, this cable meets enterprise-grade reliability standards. Operating temperature range of 0-70°C (32-158°F) accommodates both climate-controlled data centers and field deployment scenarios. The 90-day limited warranty provides confidence in product integrity. **Extreme Networks Compatibility** Direct replacement for Extreme Networks 100G-QSFP-4SFP-P-0051 and 10421-50CM part numbers, ensuring seamless integration into existing network infrastructure. Eliminates compatibility concerns while reducing procurement complexity. **Application & Use Cases** Ideal for data center networking, server-to-switch connectivity, high-performance computing clusters, and enterprise network upgrades. The compact 0.5m length optimizes cable routing in dense equipment racks, reducing clutter and improving airflow management. Passive design eliminates power consumption and heat generation. **Shipping & Support** Ships from strategically located US facilities (Danville, CA and Beaufort, SC) enabling fast delivery. Free standard shipping on orders exceeding $99. Custom brand programming available for integration into managed network solutions and white-label offerings. Invest in proven 100GB connectivity with the JBX05611—the cost-effective, reliable choice for next-generation data center infrastructure.