The JBX43649 ST/APC to LC/UPC Singlemode Fiber Patch Cable represents a premium solution for long-distance fiber optic connectivity in professional networking environments. Spanning 40 meters with a precision 9/125 singlemode core, this simplex cable is engineered to minimize signal loss and maximize data integrity across telecommunications, data center, and enterprise network installations. **Technical Excellence** This cable utilizes G.657.A1 glass fiber, supporting both 1310nm and 1550nm wavelengths with exceptional attenuation characteristics (0.25 dB/km at 1310nm; 0.35 dB/km at 1550nm). The ≤0.35dB insertion loss and ≥20dB return loss exceed industry standards, ensuring optimal performance. Each cable is individually tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards for consistent quality assurance. **Safety and Compliance** The yellow OFNR (Optical Fiber, Nonconductive, Riser-rated) jacket provides essential fire safety ratings required for in-building installations. TAA compliance ensures eligibility for federal and government procurement contracts. RoHS/ELV directive adherence guarantees environmental responsibility without compromising performance. **Practical Design Features** The compact 1.8mm outer diameter facilitates easy routing through conduit and cable trays. Straight-through polarity simplifies installation and reduces configuration errors. Available in custom lengths for flexible deployment scenarios, with convenient free standard shipping on orders exceeding $99. **Target Applications** Ideal for upgrading legacy networks, establishing long-distance backbone connections, or implementing singlemode infrastructure in enterprise environments. Perfect for telecommunications facilities, ISP installations, and data centers requiring reliable, standards-compliant connectivity. **Quality Assurance** Backed by a 90-day limited warranty and manufactured in Taiwan, the US, or China to ensure consistent availability and global supply chain reliability. Multi-location U.S. fulfillment from Danville CA, Fort Worth TX, and Beaufort SC enables rapid deployment across North America.