The JBX87199 40-meter SC/ST Duplex Singlemode Fiber Patch Cable represents premium connectivity for mission-critical telecommunications infrastructure. Designed to meet the exacting standards of data centers, telecommunications providers, and enterprise networks, this duplex fiber optic cable delivers uncompromised performance across extended distances. **Technical Excellence:** Built with G.657.A1 glass fiber and a 9/125 singlemode core, this cable provides superior light transmission characteristics optimized for both 1310nm and 1550nm wavelengths. The duplex configuration allows simultaneous bidirectional communication, essential for full-duplex networking applications. With measured insertion loss of just 0.35dB maximum and typical performance of 0.15dB, signal degradation is minimized even over 40-meter runs, ensuring crystal-clear data transmission. **Compliance & Certification:** This cable meets stringent government procurement requirements as TAA compliant and carries full RoHS/ELV certification per EU directive 2002/95/EC. Attenuation testing follows ANSI/TIA/EIA-455-171-A-2001 standards, guaranteeing reproducible, industry-standard performance. The OFNR riser-rated jacketing provides fire safety compliance for installation in commercial buildings. **Connector Configuration:** The SC/UPC to ST/UPC connector arrangement in Type A to B crossover polarity represents the most common and practical duplex patch cord configuration, ensuring compatibility with standard network equipment. Both connectors feature ultra-polished contact surfaces for minimal back-reflection. **Practical Benefits:** The 1.8mm outside diameter offers flexibility for cable management while the blue jacket aids visual identification in complex installations. At 40 meters, this cable bridges significant distances without requiring amplification, ideal for campus networks, data center interconnects, and long-haul telecommunications applications. **Custom Availability:** While this 40-meter configuration suits most applications, custom lengths are available to match your specific infrastructure requirements. **Support & Warranty:** Backed by a 90-day limited warranty and free standard shipping on orders exceeding $99, the JBX87199 represents reliable value for professional-grade fiber optic networking.