The JBX86199 40-meter SC/ST duplex singlemode fiber patch cable represents a professional-grade solution for organizations requiring reliable, high-performance fiber optic connectivity. This cable is engineered to meet the stringent demands of telecommunications infrastructure, data center environments, and enterprise network installations. **Technical Specifications:** This duplex patch cable features a 9/125 singlemode core utilizing G.657.A1 glass fiber technology, ensuring compatibility with modern network standards. The cable achieves exceptional transmission characteristics with insertion loss measurements of ≤0.35dB (typical 0.15dB) and return loss ≥20dB, meeting rigorous ANSI/TIA/EIA-455-171-A-2001 standards. At 1310nm, attenuation is 0.25dB/km, while at 1550nm it reaches 0.35dB/km, providing optimal performance across standard telecommunications wavelengths. **Construction & Durability:** With an outside diameter of 1.8mm and OFNR riser-rated jacketing, this cable balances flexibility with building code compliance. The robust plastic accessories and black coloring provide professional aesthetics while protecting against environmental factors. The 40-meter length accommodates diverse installation requirements without requiring splicing. **Compliance & Standards:** Fully TAA compliant and certified to EU directive 2002/95/EC (RoHS), this cable meets government procurement requirements and environmental standards. It's manufactured in multiple locations (TW, US, CN) ensuring supply chain reliability. **Applications:** Ideal for campus backbone connections, data center patch panels, telecommunications closets, and any installation requiring singlemode fiber reliability. The SC/UPC to ST/UPC connector configuration with Type A to B crossover polarity suits most standard duplex implementations. **Support & Warranty:** Includes a 90-day limited warranty with free standard shipping on orders over $99. Custom lengths are available for specialized installations.