The JBX43139 40-meter SC/APC to SC/UPC simplex singlemode fiber patch cable represents a premium solution for telecommunications infrastructure, data centers, and enterprise networking applications requiring reliable, high-performance fiber optic connectivity. **Superior Technical Specifications:** This singlemode fiber cable features a 9/125 micron core with G.657.A1 glass fiber composition, delivering ultra-low attenuation rates of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm. The exceptional insertion loss of ≤0.35dB (with typical performance of just 0.15dB) and return loss ≥20dB ensure minimal signal degradation across long-distance transmissions, making it ideal for bandwidth-intensive applications. **Design and Construction:** The 1.8mm outer diameter allows for efficient cable management and routing through conduits and cable trays. The distinctive yellow jacket provides excellent visibility for identification and organization within complex network installations. OFNR (Optical Fiber Non-conductive Riser) rating ensures compliance with building codes and fire safety regulations in vertical installations. **Compliance and Reliability:** Fully TAA compliant and RoHS/ELV certified, this cable meets government procurement standards and environmental regulations. The straight-through polarity configuration with SC/APC-to-SC/UPC connectors provides universal compatibility across industry-standard equipment. Backed by a 90-day limited warranty. **Applications:** Ideal for telecommunications networks, CATV systems, data center connectivity, long-distance signal transmission, and any application requiring precise, dependable fiber optic performance. Custom lengths available for specific project requirements. **Shipping and Support:** Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. Professional-grade packaging ensures safe delivery of this precision optical component.