The JBX05285 40GBASE-CR4 QSFP+ passive direct attach copper (DAC) cable represents a cost-effective, high-performance solution for Juniper network infrastructure. This 4-meter twinax cable eliminates the need for expensive active optical transceiver modules while delivering reliable 40GB connectivity in short-to-medium reach applications. **Technical Specifications:** Constructed with 28AWG copper conductors and plastic jacketing, the cable provides superior electrical properties and mechanical durability. Featuring QSFP+ male connectors on both ends, it interfaces seamlessly with Juniper EX, QFX, and MX series switches, routers, and line cards. The cable is fully IEEE 802.3ba compliant and qualified for 40GBASE-CR4 Ethernet standards. **Compliance & Certifications:** This cable meets stringent international standards including RoHS (Restriction of Hazardous Substances), EU directive 2002/95/EC, and carries UL and TUV safety certifications. These certifications ensure the product meets environmental regulations and safety requirements across global markets. **Performance & Reliability:** Operating across a wide temperature range (0°C to 70°C), the JBX05285 maintains consistent performance in diverse data center environments. Passive DAC technology requires no power consumption, reducing operational costs and heat generation compared to active alternatives. The robust copper construction minimizes signal loss and crosstalk, ensuring data integrity over the 4-meter span. **Compatibility & Replacement:** Direct compatible replacement for Juniper OEM part numbers EX-QSFP-40GE-DAC-4M, JNP-QSFP-DAC-4M, and QFX-QSFP-DAC-4M. Ideal for connecting adjacent switch stacks, line card interconnects, or server-to-network connections in virtualized environments. **Value Proposition:** Compared to active optical modules, DAC cables deliver significant cost savings while maintaining full 40GB performance. This makes them ideal for budget-conscious enterprises and service providers building or upgrading high-speed networks. The cable supports custom brand programming, allowing integration into OEM product lines. **Warranty & Support:** Backed by a 90-day limited warranty and shipped from US distribution centers in California and South Carolina, ensuring rapid delivery with free standard shipping on qualifying orders.