The JBX05593 3-meter QSFP28 to 4x SFP28 100GBASE-CR4 Direct Attach Copper breakout cable is an industrial-strength networking solution designed for demanding data center and enterprise environments. This cable directly replaces the Cisco OEM part number QSFP-4SFP25G-CU3M, offering exceptional compatibility and seamless integration into existing infrastructure. **Technical Excellence** Qualified to IEEE 802.3bj and QSFP28 MSA specifications, this breakout DAC cable delivers reliable 100Gbps performance over 3-meter distances. The 28AWG twinax copper construction ensures superior signal integrity while minimizing insertion loss, critical for maintaining data transmission quality in high-speed applications. The passive design requires no active components or power, reducing complexity and failure points. **Build Quality & Compliance** Manufactured in Vietnam and China to rigorous standards, this cable features QSFP28 male connectors at the source and four SFP28 female connectors for the breakout distribution. The durable plastic jacketing protects against environmental factors and mechanical stress. Full RoHS, TUV, and UL certifications demonstrate commitment to safety and environmental responsibility under EU Directive 2002/95/EC. **Operational Performance** Rated for operating temperatures from 0 to 70°C (32 to 158°F), this cable maintains consistent performance across diverse deployment scenarios. The 3-meter length perfectly balances reach and signal quality, ideal for in-rack connections and adjacent cabinet configurations. **Why Choose This Cable?** Compared to optical solutions, passive DAC breakout cables eliminate transceiver costs while delivering superior latency characteristics. Unlike active solutions, they require no power management. Perfect for organizations upgrading 25G infrastructure to 100G architecture without complete redesign. Backed by a 90-day limited warranty and supported by free standard shipping on qualifying orders, this is the smart choice for cost-conscious network upgrades.