The JBX05691 4-meter 100GBASE-CR4 QSFP28 passive direct attach copper cable represents a cost-effective, high-performance solution for modern data center networking infrastructure. Specifically engineered for Palo Alto Networks compatibility, this cable delivers the speed, reliability, and durability required in demanding enterprise environments. **Key Technical Specifications:** This passive DAC cable features 26AWG twinax copper conductors optimized for 100GB Ethernet transmission. The QSFP28-to-QSFP28 connector configuration ensures secure, tool-free installation and hot-pluggable operation. Operating across temperatures from 0 to 70°C (32 to 158°F), it maintains consistent performance in various data center climates. **Standards Compliance & Certifications:** Qualified to IEEE 802.3bj specifications and QSFP28 MSA standards, this cable meets the rigorous demands of high-speed networking. Full RoHS, TUV, and UL certification ensures compliance with environmental directives (EU 2002/95/EC) and safety requirements, making it suitable for regulated industries. **Performance & Benefits:** Passive DAC technology eliminates active components, reducing power consumption and latency while increasing reliability. The 4-meter length balances flexibility for intra-rack and adjacent equipment connections without signal degradation or complex signal conditioning. Direct attachment to QSFP28 ports enables immediate high-speed connectivity without additional transceivers. **Applications & Use Cases:** Ideal for data center interconnects, high-frequency trading networks, cloud infrastructure, virtualization environments, and enterprise storage systems. Perfect for connecting switches, servers, and network appliances within single or adjacent racks. **Why Choose This Cable:** Directly replaces OEM part number PAN-QSFP28-DAC-4M with superior value. Custom brand programming is available for enterprise deployments. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty for peace of mind. **Care & Maintenance:** Keep connectors dust-free and protected when not in use. Avoid bending beyond the cable's minimum bend radius. Store in cool, dry environments to maintain optimal performance longevity.