The JBX42469 FC/APC to FC/APC duplex singlemode fiber patch cable represents a professional-grade solution for telecommunications, data center, and network infrastructure applications. This 50-meter cable combines reliability, performance, and compliance to meet the demanding requirements of modern fiber optic installations. **Technical Excellence:** Featuring a 9/125 micron singlemode core with G.657.A1 glass fiber, this cable delivers superior performance characteristics. Insertion loss specifications of ≤0.35dB at 0.15dB typical and return loss of ≥20dB ensure minimal signal degradation. Attenuation testing confirms excellent performance: 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm, meeting ANSI/TIA/EIA standards. The duplex configuration with Type A to B crossover polarity provides the most common and reliable connection setup for patch cords. **Safety & Compliance:** The OFNR (Optical Fiber Non-Conductive Riser) rating ensures safe installation in vertical building runs. TAA (Trade Agreements Act) compliance makes this cable eligible for government and regulated projects. RoHS and ELV directive compliance demonstrates environmental responsibility, while ISO/IEC standards adherence guarantees quality manufacturing. **Design & Durability:** The distinctive yellow jacket provides easy identification in complex installations. The compact 1.8mm outside diameter integrates seamlessly into standard fiber management systems. FC/APC connectors offer reliable mated pair connections with excellent return loss performance. Manufacturing across Taiwan, US, and China locations ensures consistent availability and supply chain stability. **Practical Applications:** Ideal for telecommunications networks, data center interconnects, campus backbone installations, and laboratory testing. The 50-meter length accommodates medium-distance connections without splice requirements. Custom lengths are available for specialized applications. **Value & Support:** Free standard shipping on orders over $99, with multiple US distribution centers ensuring fast delivery. The 90-day limited warranty provides peace of mind. Professional-grade performance at competitive pricing makes this cable a reliable choice for network professionals and system integrators.