The JBX42611 9-meter FC/APC to ST/UPC duplex singlemode fiber patch cable represents a professional-grade solution for enterprise-level network deployments requiring reliable, high-performance optical connectivity. **Technical Specifications:** This duplex cable features dual 9/125 singlemode fibers with G.657.A1 glass composition, engineered for maximum signal fidelity across both 1310nm and 1550nm wavelengths. With attenuation ratings of 0.25dB/km at 1310nm and 0.35dB/km at 1550nm, this cable minimizes signal degradation over extended runs. The measured insertion loss of ≤0.35dB (with typical performance of 0.15dB) ensures minimal power loss at connection points, while the return loss specification of ≥20dB prevents signal reflections that could compromise network performance. **Design & Construction:** The cable features Type A to B crossover polarity configuration, the industry standard for duplex patch cord applications. Its compact 1.8mm outer diameter enables flexible routing through cable trays and conduit systems. The OFNR (Optical Fiber Nonconductive Riser) rated yellow jacket provides superior flame resistance suitable for vertical runs in building risers and plenum areas, meeting strict fire safety codes. **Applications:** Ideal for telecommunications networks, data centers, research facilities, and high-speed network installations requiring single-mode transmission. The FC/APC connector combination provides superior mechanical stability and optical performance compared to UPC terminations. **Compliance & Quality:** TAA compliant and RoHS/ELV certified, ensuring government procurement eligibility. Manufactured to ANSI/TIA/EIA-455-171-A standards with comprehensive attenuation testing. Available in custom lengths for specialized installations. **Shipping & Support:** Free standard shipping on orders exceeding $99, with distribution from three strategic U.S. locations ensuring rapid delivery. Backed by 90-day limited warranty.