The JBX42431 9m FC/APC to FC/UPC Duplex Singlemode Fiber Patch Cable represents a premium solution for signal transmission in telecommunications, data centers, and enterprise network environments. This comprehensive product combines superior optical performance with compliance certifications required by government and corporate procurement standards. **Optical Performance & Specifications:** Constructed with 9/125 singlemode fiber core and G.657.A1 glass, this cable delivers exceptional attenuation characteristics: 0.25 dB/km at 1310 nm or 0.35 dB/km at 1550 nm. Insertion loss testing shows typical performance of 0.15dB with a maximum of ≤0.35dB, ensuring signal integrity across the full 9-meter length. Return loss exceeds ≥20dB, providing optimal signal reflection control for duplex communication channels. **Design & Construction:** The 1.8mm outside diameter creates a compact footprint ideal for dense patch panel installations. OFNR-rated jacketing supports safe deployment in building risers without conduit. The bright yellow jacket facilitates rapid identification during troubleshooting and maintenance. Duplex configuration with Type A to B crossover polarity follows industry standard practices for bidirectional signal transmission. **Compliance & Certifications:** Full TAA compliance ensures eligibility for government contracts and procurement initiatives. RoHS and ELV directive compliance align with environmental regulations and corporate sustainability requirements. Manufacturing across trusted facilities in Taiwan, US, and China ensures quality consistency with multiple fulfillment options from Danville CA, Fort Worth TX, and Beaufort SC. **Applications:** Ideal for telecommunications installations, data center interconnects, fiber-to-the-building (FTTB) deployments, and enterprise network upgrades requiring reliable singlemode signal transmission. The specific FC/APC to FC/UPC configuration addresses crossover requirements in mixed connector environments. **Value & Support:** Ships with free standard shipping on orders exceeding $99. 90-day limited warranty provides peace of mind. Custom length availability accommodates specialized installation requirements. Attenuation tested per ANSI/TIA/EIA-455-171-A-2001 standards confirms performance specifications.