The JBX05158 40GBASE-CR4 QSFP+ to 4x SFP+ Direct Attach Copper Cable represents an essential connectivity solution for modern data center infrastructure. This 4-meter passive breakout cable provides a cost-effective alternative to active equipment while maintaining superior signal integrity and performance reliability. **Key Features & Benefits:** This direct attach copper (DAC) cable utilizes a passive design, eliminating the need for power consumption and reducing overall system complexity. The single QSFP+ connector breakout into four SFP+ connections enables flexible port utilization and maximizes switching capacity. With a 40GB data rate capacity, this cable supports high-bandwidth applications including cloud computing, storage networking, and virtualized environments. **Technical Specifications:** Constructed from 26AWG twinax copper with protective plastic jacketing, the cable delivers excellent shielding and EMI resistance. At 4 meters, the cable length accommodates medium to large rack configurations while maintaining signal quality. The cable meets IEEE 802.3ba standards and achieves RoHS and ELV compliance, ensuring environmental responsibility and regulatory adherence. **Compatibility & Applications:** Fullly compatible with Extreme Networks switching equipment and replaces OEM part numbers 40G-DACP-QSFP4SFP4M and related variants. Ideal for enterprise data centers, cloud infrastructure providers, and high-performance computing facilities requiring reliable, high-speed interconnectivity without active power requirements. **Reliability & Support:** Operating across a wide temperature range (0-70°C), this cable suits diverse deployment environments. Backed by a comprehensive 90-day limited warranty and supported by US-based distribution centers in California and South Carolina for rapid shipping, this cable ensures consistent performance and customer satisfaction in critical network applications.