The JBX43615 20-meter FC/APC to ST/UPC singlemode fiber patch cable represents professional-grade optical connectivity for demanding telecommunications and data center environments. This simplex configuration provides single-directional signal transmission, making it ideal for dedicated transmission or receiving pathways in fiber optic networks. **Technical Excellence** Manufactured to exacting standards, this cable features a 9/125 singlemode core with G.657.A1 glass fiber specifications. The FC/APC (Angled Physical Contact) connector on one end and ST/UPC (Straight Physical Contact) on the other enable compatibility across diverse network architectures. Tested insertion loss of ≤0.35dB (with typical performance at 0.15dB) and return loss exceeding 20dB ensure minimal signal degradation over the 20-meter distance. **Performance Specifications** Attenuation measurements confirm reliable performance: 0.25dB/km at 1310nm and 0.35dB/km at 1550nm wavelengths. The 1.8mm outside diameter and riser-rated OFNR jacketing provide durability and safety in building installations. Compliance with ANSI/TIA/EIA-455-171-A standards guarantees consistency with industry best practices. **Regulatory & Compliance** TAA (Trade Agreements Act) compliant, this cable meets government contracting requirements. Full RoHS/ELV directive compliance ensures environmental responsibility and EU market compatibility. Manufacturing in Taiwan, USA, and China provides supply chain flexibility and availability. **Practical Benefits** The distinctive yellow jacket facilitates cable identification and organization in complex installations. Available in custom lengths beyond the standard 20m, supporting flexible deployment scenarios. Backed by a 90-day limited warranty and shipped from multiple U.S. locations (Danville CA, Fort Worth TX, and Beaufort SC), ensuring rapid delivery with free shipping on orders exceeding $99. **Applications** Ideal for telecommunications facilities, data centers, laboratory equipment connections, and enterprise network infrastructure upgrades. The simplex configuration suits dedicated transmission pathways, optical testing setups, and specialized networking requirements where single-direction communication is specified.