The JBX42261 50-meter LC/APC to ST/UPC duplex singlemode fiber patch cable represents the gold standard in professional fiber connectivity. This carefully engineered cable combines precision engineering with practical functionality, making it the preferred choice for network administrators, telecommunications professionals, and data center managers. **Technical Excellence:** Built with a 9/125 singlemode core and G.657.A1 glass fiber, this cable delivers superior performance across industry-standard wavelengths. With insertion loss measured at just ≤0.35dB (0.15dB typical) and return loss ≥20dB, signal degradation is minimized, ensuring pristine data transmission. Attenuation specifications of 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm meet or exceed ANSI/TIA/EIA standards, guaranteeing reliable long-distance signal propagation. **Compliance and Certification:** TAA compliance makes this cable eligible for government and institutional procurement, while RoHS/ELV certification ensures environmental responsibility. The riser-rated (OFNR) yellow jacket provides fire safety compliance for in-building use, essential for data centers and commercial installations. **Practical Design Features:** The duplex configuration with Type A to B crossover polarity represents the most common and compatible arrangement for duplex patch cords. The slim 1.8mm outside diameter allows efficient cable routing and minimizes congestion in equipment racks. The distinctive yellow jacket ensures easy identification and faster troubleshooting in complex network environments. **Versatility and Customization:** While this 50-meter length covers most medium-distance applications, custom lengths are available for specialized installations. Ships from multiple U.S. locations (California, Texas, and South Carolina) with free standard shipping on orders over $99, ensuring quick delivery and competitive pricing. **Applications:** Perfect for telecommunications networks, data center interconnects, enterprise LAN installations, and any application requiring reliable singlemode fiber connectivity. The cable's superior performance characteristics make it suitable for both current deployments and future-proofed infrastructure investments.