The JBX42554 ST/APC to FC/UPC duplex singlemode fiber patch cable represents professional-grade connectivity for mission-critical fiber optic networks. Engineered for telecommunications providers, data centers, and enterprise network infrastructure, this 15-meter cable delivers reliable performance in the most demanding environments. **Superior Optical Performance** Features a 9/125 singlemode fiber core with G.657.A1 specification, providing excellent bend-radius performance without compromising signal quality. Insertion loss of ≤0.35dB at 1310nm or 1550nm wavelengths, with typical performance of just 0.15dB, ensures minimal signal attenuation over distance. Return loss ≥20dB meets or exceeds industry standards for professional deployments. **Compliance and Safety** Full TAA (Trade Agreements Act) compliance makes this cable suitable for government and federal infrastructure projects. RoHS/ELV compliance ensures environmental responsibility. OFNR (Optical Fiber Non-conductive Riser-rated) jacketing provides fire safety certification for in-building runs between floors without conduit. **Practical Design Features** The distinctive yellow jacket ensures easy identification in cable management systems, reducing installation errors and simplifying troubleshooting. The compact 1.8mm diameter accommodates dense rack installations and cable trays. Duplex configuration with Type A to B crossover polarity is standard for most duplex patch cord applications. **Flexibility and Support** Custom lengths available for non-standard installations. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) ensuring rapid delivery. Free standard shipping on orders exceeding $99. 90-day limited warranty provides peace of mind for your investment. **Applications** Ideal for telecommunications networks, data center interconnects, fiber-to-the-premises (FTTP) installations, and enterprise backbone connectivity. Manufactured with quality standards meeting international specifications for long-term reliability and performance consistency.