The JBX05528 represents an exceptional solution for enterprise and data center network requirements demanding reliable 100GB connectivity. This 4-meter QSFP28 direct attach copper (DAC) breakout cable is fully compatible with Cisco equipment, specifically replacing the OEM part number QSFP-2QSFP50G-CU4M while offering superior cost efficiency. **Technical Specifications & Performance:** Designed to IEEE 802.3bj specifications and QSFP28 MSA standards, this cable delivers consistent 100GBASE-CR2 performance. The 26AWG twinax construction ensures optimal signal integrity over the 4-meter distance, while copper connectors provide reliable connections with minimal insertion loss. Operating temperature range spans 0-70°C (32-158°F), accommodating diverse deployment environments from climate-controlled data centers to warm equipment rooms. **Compliance & Safety Standards:** Fully compliant with EU Directive 2002/95/EC (RoHS), this cable eliminates hazardous substances while maintaining performance excellence. TUV and UL certifications validate rigorous safety testing, ensuring workplace compliance and peace of mind. The harmonization code 8544.42.9090 classifies this product for customs and import purposes. **Key Advantages:** As a passive DAC solution, this cable requires zero external power, eliminating operational costs and cooling concerns. Unlike active optical cables, it generates minimal heat, extending equipment lifespan and reducing infrastructure strain. The straightforward plug-and-play design requires no configuration, enabling rapid deployment in time-sensitive network expansion scenarios. **Ideal Applications:** Perfect for interconnecting switches, routers, and servers in high-speed data center networks. Commonly deployed in virtualized environments, cloud infrastructure, storage area networks (SANs), and high-performance computing clusters. Particularly valuable for organizations seeking cost-effective 100GB connectivity without sacrificing reliability. **Why Choose This Cable:** With domestic US shipping from Danville, CA and Beaufort, SC locations, rapid delivery is guaranteed. Free standard shipping on orders exceeding $99 provides exceptional value. The 90-day limited warranty demonstrates manufacturer confidence in product quality and durability. Custom brand programming is available for organizations requiring OEM labeling or integration into standardized equipment packages. **Maintenance & Longevity:** Minimal maintenance requirements characterize this passive solution. Protective plastic jacketing shields copper conductors from environmental exposure and handling damage. Proper storage in dry conditions and careful cable management ensure extended operational lifespan, often spanning multiple deployment cycles across network infrastructure upgrades.