The JBX05581 is a premium 5-meter 100GBASE-CR4 QSFP28 to 4x SFP28 passive breakout direct attach copper (DAC) cable designed for enterprise-class networking infrastructure. This high-performance twinax cable delivers exceptional value for organizations modernizing datacenter environments, providing a cost-effective alternative to optical solutions for shorter cable runs. **Technical Specifications & Features:** Constructed with 26AWG copper conductors and durable plastic jacketing, this breakout cable enables single 100GB/s QSFP28 connections to split into four independent 25GB/s SFP28 links. The passive design eliminates complex active electronics, reducing heat generation, power draw, and potential points of failure. Meeting IEEE 802.3bj and QSFP28 MSA standards, the cable ensures compatibility across certified equipment ecosystems. **Performance & Reliability:** With operating temperatures ranging from 0-70°C (32-158°F), this cable performs dependably in various datacenter environments. The 12x12x5mm compact form factor integrates seamlessly into dense switch configurations without creating cable management challenges. RoHS and TUV certifications guarantee compliance with international environmental and safety directives. **Extreme Networks Compatibility:** Direct replacement for Extreme Networks part number 100G-DACP-QSFP4SFP5M, this cable is engineered specifically for compatibility with Extreme Networks switching infrastructure, ensuring optimal signal integrity and performance. **Ideal Applications:** - High-density datacenter rack deployments - Storage area network (SAN) backbone connections - Server cluster interconnectivity - Direct server-to-switch 100GB connections requiring breakout capability - Enterprise network upgrades **Warranty & Support:** Backed by a comprehensive 90-day limited warranty and available for custom brand programming, the JBX05581 represents a dependable investment in network infrastructure. Ships from US locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99.