The JBX05089 400G QSFP-DD Direct Attach Copper Cable represents a cost-effective and efficient solution for modern high-speed network infrastructure. At 2.5 meters in length, this passive DAC cable is specifically designed as a Juniper QDD-400G-DAC-2P5M compatible replacement, offering seamless integration into existing network environments. **Key Technical Features:** This cable implements the 400GBASE-CR8 standard, delivering four lanes of 100Gbps connectivity for a total 400Gbps data rate. The 26AWG twinax copper construction ensures excellent signal quality with minimal attenuation over the 2.5-meter span. Both connectors are QSFP-DD (Quad Small Form Factor Pluggable Double Density), the industry-standard high-density interconnect format. **Compliance & Standards:** The JBX05089 meets rigorous international standards including ETC 400GBASE-CR8, QSFP-DD MSA, and CMIS specifications. It carries RoHS, TUV, and UL certifications, ensuring compliance with EU directive 2002/95/EC. The cable operates reliably in environments with temperatures ranging from 0°C to 70°C (32°F to 158°F). **Advantages of Passive DAC Technology:** As a passive direct attach cable, the JBX05089 requires no power consumption, generates minimal heat, and reduces operational costs compared to active optical solutions. This makes it ideal for data center deployments where energy efficiency and heat management are critical concerns. **Applications & Use Cases:** Perfect for server-to-switch connections, switch-to-switch links, and data center infrastructure requiring high-bandwidth, low-latency connectivity. The 2.5-meter length accommodates typical rack-to-rack and inter-cabinet distances in standard data center configurations. **Warranty & Support:** Backed by a 90-day limited warranty and available with free standard shipping on orders exceeding $99. Ships from multiple US locations (Danville, CA and Beaufort, SC) for faster delivery. Custom brand programming options are available for enterprise deployments.