The JBX05587 5-meter 100GBASE-CR4 QSFP28 to 4x SFP28 direct attach copper breakout cable represents a sophisticated solution for modern data center networking requirements. As a fully compatible replacement for the HPE Q9S72A-5M (845418-B21), this cable seamlessly integrates into existing enterprise infrastructure while delivering exceptional performance and reliability. **Technical Specifications:** Designed to IEEE 802.3bj and QSFP28 MSA standards, this passive breakout DAC features premium 26AWG copper twinax construction encased in protective plastic jacketing. The cable operates across a wide temperature range (0-70°C / 32-158°F), ensuring consistent performance in diverse data center environments. Its 5-meter length provides optimal flexibility for standard rack configurations and equipment spacing. **Compliance & Certification:** Fully compliant with EU RoHS Directive 2002/95/EC and carrying TUV and UL safety certifications, this cable meets stringent industrial standards. These credentials ensure safe deployment in regulated environments and guarantee environmental responsibility. **Performance Benefits:** As a passive breakout solution, this cable eliminates the need for active electronics, reducing power consumption and heat generation—critical advantages in energy-efficient data centers. The direct attach design minimizes latency and jitter, delivering reliable 100GB connectivity without the overhead of active components. **Application Scenarios:** Perfect for HPE ProLiant server upgrades, high-density switch deployments, and storage area network (SAN) interconnects, this cable supports demanding applications requiring sustained bandwidth. The 4x SFP28 breakout configuration enables flexible port allocation and cost-effective network scaling without complete infrastructure overhaul. **Durability & Support:** Manufactured in Vietnam and China with copper connectors for superior conductivity, this cable withstands frequent insertion/extraction cycles typical in production environments. Backed by a 90-day limited warranty and supported by experienced customer service teams in Danville, CA and Beaufort, SC, this product delivers peace of mind alongside performance. **Value Proposition:** By choosing this HPE-compatible alternative, organizations achieve significant cost savings compared to OEM pricing while maintaining full compatibility and performance standards. Free standard shipping on orders exceeding $99 makes this solution economically attractive for bulk purchases and inventory replenishment. Whether upgrading legacy systems or building new high-speed networks, the JBX05587 delivers the reliability, performance, and value that modern data centers demand.