The JBX05420 represents a critical infrastructure component for organizations deploying high-speed Juniper networking environments. This 2.5-meter 40GBASE-CR4 QSFP+ passive direct attach copper cable delivers enterprise-grade performance without the complexity and expense of active optical solutions. **Key Technical Specifications:** This cable features premium 30AWG twinax copper construction, providing optimal signal integrity and electromagnetic shielding across its 2.5-meter span. As a passive DAC solution, it eliminates power requirements and thermal concerns associated with active transceivers, making it ideal for dense switch installations where heat management is critical. **Compatibility & Integration:** Fully compatible with Juniper's QFX, EX, and MX series platforms, the JBX05420 replaces multiple OEM part numbers including EX-QSFP-40GE-DAC-250CM and QFX-QSFP-DAC-250CM variants. The dual QSFP+ connectors ensure seamless connectivity with standard 40G infrastructure. **Standards & Certifications:** Qualified to IEEE 802.3ba specifications, this cable meets stringent industry standards for 40GB Ethernet applications. RoHS, TUV, and UL certifications guarantee compliance with EU directives and safety regulations, essential for enterprise deployments. **Performance Advantages:** Passive DAC cables like the JBX05420 offer superior advantages over active solutions: lower total cost of ownership, zero power consumption, minimal latency, and simplified troubleshooting. The cable operates reliably across industrial temperature ranges (0-70°C), suitable for both standard and edge datacenter environments. **Applications:** Ideal for high-speed interconnects between switches, routers, servers, and storage systems in enterprise datacenters, HPC clusters, and carrier-grade networks. The 2.5m length accommodates typical rack-to-rack and switch-to-server configurations. **Support & Warranty:** Backed by a 90-day limited warranty with U.S. warehousing in Danville, CA and Beaufort, SC ensuring rapid delivery. Free standard shipping applies to orders exceeding $99.