The JBX42623 FC/APC to ST/UPC duplex singlemode fiber patch cable represents professional-grade telecommunications infrastructure designed to meet the rigorous demands of modern data centers, telecommunications facilities, and enterprise networks. This 60-meter cable combines precision engineering with compliance standards to ensure dependable signal transmission over extended distances. **Technical Specifications & Performance:** This cable features a 9/125 singlemode core with G.657.A1 glass fiber construction, providing superior performance characteristics. The measured insertion loss is ≤0.35dB (0.15dB typical), with return loss specifications of ≥20dB. Attenuation is rated at 0.25 dB/km at 1310 nm or 0.35 dB/km at 1550 nm, meeting ANSI/TIA/EIA-455-171-A-2001 standards. The 1.8mm outside diameter provides optimal balance between flexibility and durability. **Connector Configuration:** The FC/APC to ST/UPC duplex configuration with Type A to B crossover polarity is the most common arrangement for duplex patch cord applications, enabling straightforward integration into existing infrastructure. This versatile connector pairing supports diverse networking environments. **Compliance & Safety:** Fully TAA compliant and RoHS/ELV certified per EU directive 2002/95/EC, this cable meets government and enterprise procurement requirements. OFNR riser-rated jacketing ensures superior fire safety performance in building installations. **Practical Advantages:** The distinctive yellow jacket facilitates rapid cable identification and simplifies installation workflows. Custom length availability allows for precise network layout optimization. Free standard shipping on orders exceeding $99 reduces procurement costs, while the 90-day limited warranty provides installation confidence. **Ideal Applications:** Perfect for telecommunications networks, data center upgrades, campus network infrastructure, and any environment requiring long-distance, high-reliability fiber signal transmission. The duplex design enables bidirectional communication on a single cable run, maximizing space efficiency.