The JBX42187 5m LC/APC to FC/UPC Duplex Singlemode Fiber Patch Cable represents professional-grade optical connectivity designed for mission-critical telecommunications, data center, and enterprise network applications. This meticulously engineered patch cable combines superior optical performance with regulatory compliance and practical installation features. **Technical Excellence** With a 9/125 singlemode fiber core and G.657.A1 specification, this cable delivers exceptional optical performance across the standard telecommunications wavelengths. The insertion loss of ≤0.35dB (0.15dB typical) and return loss of ≥20dB exceed industry standards, ensuring minimal signal degradation and optimal system performance. Attenuation specifications are verified at both 1310nm and 1550nm wavelengths, addressing the full range of modern fiber optic systems. **Connector Configuration** The LC/APC to FC/UPC configuration with Type A to B crossover polarity represents the most common duplex patch cord standard. LC/APC connectors feature angled physical contact for superior return loss performance, while FC/UPC connectors provide traditional screw-coupling reliability. This combination enables seamless integration with diverse network equipment and infrastructure. **Regulatory Compliance & Safety** Fully TAA compliant and manufactured in accordance with RoHS/ELV directives (EU 2002/95/EC), this cable meets government procurement requirements and environmental standards. The OFNR riser-rated yellow jacket provides fire safety compliance for installations in plenum spaces and vertical runs, while the distinctive yellow color ensures easy identification and organization in complex network environments. **Construction & Durability** The 1.8mm outside diameter provides flexibility for dense cable management while maintaining structural integrity. The duplex configuration supports simultaneous bidirectional transmission, doubling throughput capacity and enabling full-duplex communications essential for modern network protocols. **Available Options & Support** This cable is available in custom lengths beyond the standard 5m configuration, allowing flexibility for specific installation requirements. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty and tested to rigorous ANSI/TIA standards, this patch cable represents a reliable investment in network infrastructure. **Ideal Applications** Perfect for data center interconnects, telecommunications backbone systems, enterprise LAN upgrades, and any application requiring singlemode fiber connectivity with mixed connector types. The TAA compliance makes it especially suitable for government agencies and institutions with federal procurement requirements.