The JBX85069 4m LC/ST Duplex Singlemode Fiber Patch Cable represents a premium solution for fiber optic network connectivity in professional environments. This yellow-jacketed patch cable combines advanced optical performance with robust construction to meet the demands of modern telecommunications infrastructure. **Superior Optical Performance** Features a precision 9/125 singlemode core with G.657.A1 grade glass fiber, optimized for long-distance signal transmission. The cable delivers exceptional low insertion loss of ≤0.35dB typical (maximum 0.35dB) and high return loss of ≥20dB, ensuring minimal signal degradation across both 1310nm and 1550nm wavelength windows. Performance is validated to ANSI/TIA/EIA-455-171-A standards. **Professional Construction** The duplex configuration with LC/UPC and ST/UPC connectors provides Type A to B crossover polarity—the industry standard for most duplex patch applications. The 1.8mm outside diameter enables discreet cable routing without occupying excessive space in crowded patch panels. Riser-rated (OFNR) jacketing ensures safe installation in vertical building spaces while maintaining flame resistance. **Compliance and Durability** Fully RoHS and ELV compliant, meeting EU directive 2002/95/EC requirements. The cable is backed by a comprehensive 90-day limited warranty, providing confidence in long-term reliability. **Flexible Solutions** While this product ships as a 4-meter cable, custom lengths are available upon request to precisely match your network infrastructure requirements. Free standard shipping applies to orders exceeding $99, with rapid fulfillment from regional distribution centers in California, Texas, or South Carolina. **Ideal Applications** Perfect for fiber-to-the-desktop installations, data center patch panels, telecommunications closets, and backbone network connections. The yellow coloring aids in visual circuit identification and cable management organization. Invest in reliable, standards-compliant fiber connectivity with the JBX85069 singlemode patch cable.