The JBX42491 9-meter ST/APC to ST/UPC duplex singlemode fiber patch cable represents a critical component for modern network infrastructure, telecommunications, and data center deployments. This professionally engineered cable combines precision optical performance with robust construction to meet the demanding requirements of enterprise-level applications. **Technical Specifications** Built with 9/125 singlemode fiber core and G.657.A1 grade glass fiber, this duplex cable delivers superior signal transmission characteristics. The cable demonstrates exceptional optical performance with insertion loss measuring ≤0.35dB (typical 0.15dB) and return loss exceeding 20dB, exceeding industry standards for reliable long-distance signal propagation. Attenuation specifications are verified at 0.25 dB/km (1310nm) or 0.35 dB/km (1550nm). **Design and Construction** The yellow OFNR-rated jacketing provides 1.8mm outer diameter protection suitable for both riser and plenum-rated installations. The Type A to B crossover polarity configuration represents the industry-standard arrangement for duplex patch cord applications, ensuring seamless integration with existing network infrastructure. RoHS and ELV compliance ensures environmental responsibility and regulatory adherence. **Features and Benefits** TAA compliance enables deployment in government and regulated environments. Low insertion loss minimizes signal degradation across extended distances, critical for backbone networks and long-span applications. The duplex configuration supports bidirectional communication in single cable runs, reducing installation complexity and space requirements. Riser-rated construction accommodates building code requirements in vertical cable runs. **Applications** Ideal for telecommunications networks, high-speed data centers, corporate backbone installations, and CWDM/DWDM systems. The 9-meter length suits equipment-to-wall and inter-floor applications common in structured cabling systems. **Customization and Support** Custom lengths are available for specialized applications. All cables undergo rigorous testing to ANSI/TIA/EIA-455-171-A-2001 standards. Backed by a 90-day limited warranty and free standard shipping on orders exceeding $99. Available from multiple domestic distribution centers for expedited delivery.