The JBX05221 QSFP+ to SFP+ breakout cable represents an ideal solution for modern data center architectures and enterprise networking infrastructures requiring high-density, high-speed connectivity. As a direct replacement for Cisco's QSFP-4X10G-AC3M, this 3-meter active breakout DAC cable delivers professional-grade performance with proven reliability. **Technical Specifications & Performance:** Operating at 40GBASE-CR4 speeds, this cable supports full 40GB bandwidth across its single QSFP+ connector, distributing the signal across four independent 10G SFP+ ports. The IEEE 802.3ba and SFF-8436 compliance ensures interoperability with industry-standard equipment. With 30AWG gauge twinax copper construction, the cable minimizes signal degradation over its 3-meter span, making it ideal for inter-switch connections, storage area networks, and virtualized environments. **Design & Build Quality:** The active breakout design incorporates integrated electronics optimizing signal integrity without introducing excessive power consumption or heat. The copper conductors with plastic jacketing provide durability against physical stress, while the compact profile facilitates easy cable management in crowded rack environments. Manufacturing in Vietnam and China ensures cost-effectiveness without compromising quality standards. **Compliance & Certifications:** Fully RoHS, ELV, TUV, and UL certified, this cable meets stringent international safety and environmental standards (EU Directive 2002/95/EC). The certification portfolio ensures compatibility with enterprise procurement requirements and regulatory compliance in global deployments. **Installation & Compatibility:** Designed specifically for Cisco infrastructure, this cable is compatible with Cisco switches and network equipment featuring QSFP+ and SFP+ ports. The 3-meter length accommodates typical data center rack-to-rack distances. Operating temperature range of 0-70°C (32-158°F) supports both standard and warm data center environments. **Value Proposition:** Compared to purchasing four separate 10G direct attach cables or investing in expensive optical solutions, this breakout cable offers significant cost savings while maintaining performance parity. The 90-day limited warranty provides peace of mind for critical network deployments. **Shipping & Support:** Eligible for free standard shipping on orders exceeding $99, with rapid dispatch from Danville, CA or Beaufort, SC locations. Custom brand programming is available for organizations requiring white-label solutions.