The JBX42544 ST/APC to FC/UPC duplex singlemode fiber patch cable represents the gold standard in optical connectivity solutions. This 2.5-meter cable combines precision engineering with practical design features, making it an essential component for data centers, telecommunications facilities, and enterprise networks requiring reliable signal transmission. **Technical Excellence**: Built with a 9/125 singlemode core and G.657.A1 grade glass fiber, this cable delivers superior performance characteristics. The measured insertion loss of ≤0.35dB (0.15dB typical) at 1310nm and attenuation of 0.35dB/km at 1550nm ensures minimal signal degradation over distance. Return loss specifications of ≥20dB provide excellent signal reflection control, critical for maintaining data integrity in duplex communications. **Compliance & Certification**: As a TAA (Trade Agreements Act) compliant product, this cable meets rigorous government procurement standards. RoHS/ELV directive compliance ensures environmental responsibility without compromising performance. The cable undergoes individual attenuation testing per ANSI/TIA/EIA-455-171-A-2001 standards, guaranteeing consistent quality across every unit. **Installation & Safety**: The OFNR riser-rated jacketing provides critical fire safety in building installations, particularly in plenum spaces where fire ratings are essential. The distinctive yellow color aids in network administration and troubleshooting by providing clear visual identification in cable bundles. Type A to B crossover polarity is pre-configured as the industry standard for duplex patch cords, eliminating guesswork during installation. **Practical Features**: The compact 1.8mm outside diameter allows flexible routing through tight spaces while maintaining durability. This cable ships from multiple U.S. locations (California, Texas, South Carolina) ensuring fast delivery. A 90-day limited warranty protects your investment, and custom lengths are available for specialized applications. **Applications**: Perfect for connecting network switches, optical transceivers, telecommunications equipment, and fiber-to-the-desk installations. The singlemode architecture supports long-distance, high-bandwidth applications where multimode cables fall short. **Cost-Effective Solution**: With free standard shipping on orders exceeding $99, this TAA-compliant cable offers exceptional value for businesses requiring reliable optical connectivity without premium pricing.