The JBX05823 0.5m 100GBASE-CR4 QSFP28 passive direct attach copper cable represents enterprise-grade networking connectivity designed for modern data center environments. This high-performance DAC cable delivers consistent 100GB Ethernet speeds with exceptional reliability and minimal signal degradation over short distances. **Key Features & Specifications:** This QSFP28-to-QSFP28 passive DAC cable utilizes 30AWG twinax copper construction, providing superior electrical characteristics and signal integrity. Operating across temperatures from 0°C to 70°C (32°F to 158°F), it maintains consistent performance in demanding server room conditions. The cable's compact 0.5m (19.7-inch) length is ideal for rack-level connectivity between adjacent network equipment, switches, and server NICs. **Compliance & Certification:** Fully qualified to IEEE 802.3bj specifications and QSFP28 MSA standards, ensuring compatibility with enterprise-grade equipment. RoHS/ELV and EU directive 2002/95/EC compliant, with additional TUV and UL safety certifications validating quality and environmental responsibility. **HPE Compatibility:** This cable directly replaces HPE original equipment manufacturer part numbers 834973-B21, R1N34A, and 845402-B21, ensuring seamless integration into existing HPE infrastructure without additional configuration requirements. **Applications:** Ideal for high-speed data center interconnects, server-to-switch connections, and storage area network (SAN) deployments requiring low-latency, high-bandwidth transmission. The passive design eliminates the need for power consumption, reducing operational costs while maintaining performance. **Warranty & Support:** Backed by a 90-day limited warranty. Ships from Danville, CA and Beaufort, SC locations. Custom brand programming available for enterprise deployments. Free standard shipping on orders exceeding $99.