The JBX43319 40-meter SC/APC to FC/UPC simplex singlemode fiber patch cable represents a premium solution for demanding telecommunications and data center applications. Designed with precision engineering, this cable delivers the performance characteristics required for modern optical networking infrastructure. **Technical Specifications:** Featuring a 9/125 singlemode fiber core with G.657.A1 glass fiber classification, this cable supports high-speed signal transmission across extended distances. The SC/APC connector provides superior return loss characteristics (≥20dB), while the FC/UPC termination ensures reliable connection stability. Insertion loss measurements of ≤0.35dB (typical 0.15dB) at 1310nm and attenuation of 0.35dB/km at 1550nm demonstrate exceptional signal integrity. **Build Quality & Compliance:** The cable features a robust 1.8mm outside diameter with OFNR (Optical Fiber Non-Conductive Riser) rated jacketing, meeting stringent fire safety requirements for in-building vertical installations. Fully RoHS and ELV compliant, it satisfies government procurement standards. TAA compliance ensures suitability for federal procurement requirements. **Applications:** Ideal for telecommunications networks, data centers, research facilities, and enterprise connectivity solutions requiring long-distance simplex transmission. The yellow jacket provides visibility in congested cable environments. **Warranty & Support:** Includes a 90-day limited warranty. Backed by testing to ANSI/TIA/EIA-455-171-A standards. Ships from multiple US locations with free standard shipping on orders exceeding $99. **Customization Available:** Custom length options available for tailored installation requirements. Manufactured in Taiwan, US, and China with consistent quality control. This cable represents an industry-standard solution for professionals requiring certified, tested optical connectivity with superior performance characteristics and full compliance documentation.