The JBX05285 4m 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents an essential infrastructure component for modern high-speed networking environments. This premium-grade cable is specifically engineered to provide Juniper network administrators with a reliable, cost-effective solution for connecting switches, routers, and optical transport systems within data centers and enterprise networks. **Technical Specifications & Performance** With a length of 4 meters and 28AWG twinax copper construction, this passive DAC cable delivers 40GB/s data transmission rates while maintaining signal fidelity across extended distances. The cable meets stringent IEEE 802.3ba standards, ensuring compatibility with cutting-edge networking infrastructure. The QSFP+ to QSFP+ connectors feature gold-plated copper contacts for superior conductivity and durability, withstanding thousands of connect/disconnect cycles without degradation. **Compatibility & Interoperability** Designed with Juniper equipment in mind, this cable directly replaces OEM part numbers EX-QSFP-40GE-DAC-4M, JNP-QSFP-DAC-4M, and QFX-QSFP-DAC-4M. It seamlessly integrates with Juniper EX Series and QFX Series switch platforms, providing plug-and-play installation without requiring additional firmware updates or configuration adjustments. **Environmental & Compliance Benefits** This cable is fully compliant with RoHS (Restriction of Hazardous Substances) and EU Directive 2002/95/EC, making it an environmentally responsible choice for sustainable network deployments. Safety certifications include RoHS, TUV, and UL approval, guaranteeing safe operation in diverse installation environments. Operating temperature range of 0-70°C ensures reliable performance in standard data center conditions. **Cost-Effectiveness & Energy Efficiency** As a passive DAC solution, this cable requires no external power or active circuitry, resulting in lower operational costs, reduced power consumption, and minimal heat generation compared to active alternatives. This makes it ideal for high-density switch deployments where cable management and thermal management are critical considerations. **Quality Assurance & Support** Every cable undergoes rigorous quality testing to ensure optimal performance. A 90-day limited warranty provides peace of mind, backed by professional customer support. Custom brand programming is available for organizations requiring proprietary labeling or documentation. **Shipping & Availability** Eligible for free standard shipping on orders exceeding $99, with convenient fulfillment from multiple U.S. locations (Danville, CA and Beaufort, SC). The cable is manufactured in Vietnam and China using high-quality materials and processes that meet international standards.