The JBX05939 2-meter QSFP56 to 4x SFP56 Direct Attach Copper Cable represents a critical infrastructure component for modern high-speed data center networks. Engineered to deliver 200GBASE-CR4 performance, this passive breakout cable enables seamless connectivity between 200Gbps QSFP56 ports and quad 50Gbps SFP56 interfaces without requiring power or active components. **Technical Specifications & Design:** Constructed with premium 26AWG copper twinax conductors, the JBX05939 delivers exceptional signal integrity over its 2-meter length. The cable features a QSFP56 connector on one end and four individual SFP56 connectors on the other, enabling flexible deployment options. The copper construction with plastic jacketing provides durability while maintaining optimal electrical characteristics. Manufactured in Vietnam and China to exacting standards, this cable is fully qualified to IEEE 802.3cd and CMIS specifications. **Compliance & Certifications:** As a passive Direct Attach Copper solution, this cable offers significant advantages over active alternatives. It carries RoHS/ELV certification per EU Directive 2002/95/EC and complies with TUV and UL safety standards. The cable operates reliably across the 0-70°C temperature range, making it suitable for typical data center environments. **Cisco Compatibility & Interoperability:** This cable is a direct compatible replacement for the Cisco QSFP-4S50-CU2.5M (OEM P/N QSFP-4S50-CU2.5M), ensuring seamless integration into existing Cisco network infrastructure. Whether you're upgrading legacy systems or deploying new high-speed networks, this proven compatibility eliminates integration risks. **Applications & Use Cases:** Perfect for data centers, cloud computing facilities, and enterprise networks requiring high-density 200Gbps connectivity. The 2-meter length accommodates typical rack-to-rack deployments while maintaining signal quality. The breakout configuration enables efficient port utilization, allowing a single 200G connection to distribute traffic across four 50Gbps interfaces. **Warranty & Support:** Backed by a 90-day limited warranty, this cable provides peace of mind for your infrastructure investment. Custom brand programming is available for enterprise deployments. Ships from convenient US locations with free standard shipping on orders exceeding $99.