The JBX05338 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents a critical infrastructure component for modern data center and enterprise networking deployments. This 0.5-meter cable is specifically engineered to provide high-speed, low-latency connectivity between network switches, routers, and storage systems that require 40Gbps performance. **Key Technical Features:** With 30AWG twinax copper construction, this passive DAC cable minimizes electromagnetic interference while maintaining signal fidelity across short-reach connections. The compact 0.5m length is ideal for equipment located in close proximity, such as adjacent rack positions or integrated cluster configurations. Unlike active cables, passive DAC technology eliminates power consumption and heat generation, reducing operational costs and environmental impact. **Compliance and Certification:** Fully qualified to IEEE 802.3ba and SFF-8436 standards, this cable undergoes rigorous testing to ensure compatibility with Juniper QFX and EX series products. RoHS, TUV, and UL certifications confirm adherence to safety and environmental regulations, making it suitable for regulated enterprise environments. The EU directive 2002/95/EC compliance ensures global deployability. **Performance Specifications:** Operating temperature range of 0-70°C supports diverse data center environments, from climate-controlled facilities to edge deployments. The QSFP+ form factor with dual copper connectors ensures tool-free installation and reliable connections. Data transmission rates of 40GB enable high-throughput applications including server-to-storage, switch-to-switch, and cluster interconnect scenarios. **Compatibility and Replacements:** This cable directly replaces Juniper OEM part numbers including EX-QSFP-40GE-DAC-50CM, JNP-QSFP-DAC-50CM, and QFX-QSFP-DAC-50CM, providing cost-effective alternatives without sacrificing quality or performance. Extensive testing ensures seamless interoperability with Juniper networking platforms. **Shipping and Support:** Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) for expedited delivery. Qualifying orders receive free standard shipping. The 90-day limited warranty provides peace of mind for critical infrastructure investments. Custom brand programming is available for volume purchases and specialized requirements.