The JBX05290 40GBASE-CR4 QSFP+ Passive Direct Attach Copper Cable represents a superior choice for modern data center connectivity solutions. This 4-meter passive DAC cable eliminates the need for active components, reducing power consumption, heat generation, and operational costs while maintaining exceptional performance standards. **Key Features & Specifications:** Built with premium 28AWG twinax copper conductors and protective plastic jacketing, this cable delivers reliable 40GB data transmission speeds across its full 4-meter length. The QSFP+ connector configuration ensures seamless compatibility with NVIDIA Mellanox infrastructure, including switches, network interface cards, and storage systems. Operating across temperatures from 0-70°C, it maintains signal integrity in diverse environments. **Compliance & Certification:** Fully compliant with IEEE 802.3ba and SFF-8436 standards, this cable meets strict regulatory requirements including RoHS, TUV, and UL certifications. The EU directive 2002/95/EC (RoHS) compliance ensures environmental responsibility and global compatibility. **Technical Advantages:** Passive DAC technology eliminates transceiver requirements, reducing equipment expenses and power draw. The direct copper-to-copper connection provides superior signal quality with minimal latency—critical for high-frequency trading, cloud infrastructure, and virtualization environments. The 4-meter length accommodates typical rack-to-rack configurations in standard data center layouts. **Applications & Use Cases:** Ideally suited for enterprise data centers, HPC clusters, cloud computing facilities, and storage area networks requiring 40GB connectivity. Perfect for replacing aging infrastructure or expanding capacity in Mellanox-based deployments. **Compatibility & Replacement:** Direct replacement for OEM part numbers MCP1700-B004E, MC2210128-004, and MC2206128-004, ensuring drop-in compatibility with existing systems. Each cable includes a 90-day limited warranty and benefits from free standard shipping on qualifying orders. **Why Choose This Cable:** Combining enterprise reliability, cost-effectiveness, and proven performance, this QSFP+ DAC cable delivers the connectivity your infrastructure demands without premium pricing.