The JBX05378 1m Cisco Compatible 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents an essential connectivity solution for modern high-speed data center and enterprise networking infrastructure. Built with precision engineering and quality materials, this twinax cable delivers exceptional performance for demanding applications requiring reliable 40GB Ethernet connectivity. **Technical Excellence** Constructed with 30AWG copper conductors and protective plastic jacketing, this passive DAC cable meets rigorous IEEE 802.3ba specifications for 40GBASE-CR4 technology. The cable's passive design eliminates the need for active electronics or external power sources, reducing operational costs while minimizing latency. With QSFP+ connectors on both ends, it provides direct connections between compatible network switches, servers, and storage systems without requiring intermediate adapters or transceivers. **Compliance & Safety** This cable maintains full RoHS (Restriction of Hazardous Substances) compliance and adheres to EU directive 2002/95/EC. Safety certifications from TUV and UL ensure reliable operation across diverse environments. The cable operates effectively within a temperature range of 0-70°C (32-158°F), making it suitable for standard data center conditions. **Compatibility & Replacements** As a Cisco-compatible solution, the JBX05378 serves as a direct replacement for original equipment manufacturer (OEM) parts including Cisco QSFP-H40G-CU1M and MA-CBL-40M. This compatibility extends across Cisco's extensive line of 40GB network infrastructure, making it an economical alternative to proprietary solutions without sacrificing quality or performance. **Application Scenarios** Ideal for high-speed interconnects in data centers, cloud computing facilities, and enterprise networks, this 1-meter cable provides optimal performance for short-distance connections. It's particularly valuable in switch-to-server, server-to-storage, and switch-to-switch applications where cost-effective, power-efficient connectivity is essential. **Reliable Support** Each cable includes a 90-day limited warranty, backed by professional customer support. Custom brand programming is available for enterprise deployments requiring standardized identification and asset tracking. Enjoy hassle-free delivery with free standard shipping on orders exceeding $99, shipped from conveniently located distribution centers in Danville, CA and Beaufort, SC.