The JBX05691 4-meter 100GBASE-CR4 QSFP28 passive DAC cable represents an enterprise-grade solution for high-speed network connectivity in modern data centers. Engineered to replace Palo Alto Networks part number PAN-QSFP28-DAC-4M, this cable delivers reliable 100Gbps performance for critical networking infrastructure. **Technical Specifications:** This passive direct attach copper (DAC) cable features 26AWG twinax construction optimized for low-loss signal transmission. The QSFP28 to QSFP28 connectors ensure compatibility with a wide range of network equipment supporting 100GBASE-CR4 standards. At 4 meters in length, it provides ideal reach for inter-switch connections and server-to-switch deployments without excessive attenuation. **Performance & Compliance:** Fully qualified to IEEE 802.3bj specifications and QSFP28 MSA standards, this cable guarantees compatibility with enterprise networking platforms. Multiple safety certifications including RoHS compliance, TUV, and UL approval demonstrate commitment to quality and safety standards. The cable operates reliably across 0-70°C temperature ranges, accommodating diverse data center environments. **Advantages of Passive DAC:** Unlike active cables, this passive design requires no external power or electronics, reducing system complexity and potential points of failure. This cost-effective approach maintains exceptional signal integrity while minimizing deployment overhead. The robust copper construction with protective plastic jacketing ensures durability in high-density rack environments. **Applications:** Ideal for connecting Palo Alto Networks security appliances, high-performance switches, and servers in modern data centers. Perfect for organizations requiring reliable 100GB connectivity without the added cost and complexity of active solutions. **Warranty & Support:** Backed by a 90-day limited warranty, ensuring customer confidence. Custom brand programming options available for enterprise deployments. Ships from conveniently located U.S. warehouses with free standard shipping on orders exceeding $99.