The JBX91186 4-meter SC/ST duplex singlemode fiber patch cable represents a robust solution for professional network infrastructure deployments. This telecommunications-grade component is specifically engineered to meet demanding performance standards in enterprise data centers, telecommunications facilities, and government installations. **Technical Excellence:** Built with 9/125 micron singlemode fiber core and G.657.A1 glass specification, this cable delivers superior optical performance. The measured insertion loss of ≤0.35dB (typical 0.15dB) and return loss ≥20dB minimize signal loss across both 1310nm and 1550nm wavelengths. Performance testing adheres to ANSI/TIA/EIA-455-171-A standards, ensuring reliability in critical applications. **Connector Configuration:** The SC/UPC to ST/UPC connector configuration with Type A to B crossover polarity represents the industry standard for duplex patch cord applications. Both SC and ST connectors provide secure mechanical engagement and consistent optical alignment essential for professional installations. **Compliance & Standards:** TAA compliance makes this cable ideal for Government and public sector projects. RoHS/ELV directive adherence (EU 2002/95/EC) ensures environmental responsibility. OFNR riser-rating provides flame resistance suitable for installation in building plenums and vertical runs. **Installation Advantages:** The 1.8mm outer diameter provides flexibility for tight routing in crowded patch panels and equipment racks. The green jacket aids visual identification while the 4-meter length accommodates typical patch panel to equipment distances. Custom lengths are available for specialized deployment scenarios. **Applications:** Ideally suited for fiber-to-the-desk networks, data center equipment interconnections, telecommunications hub installations, and any application requiring singlemode fiber connectivity with Government procurement compliance. **Quality Assurance:** Backed by a 90-day limited warranty and manufactured in facilities across Taiwan, US, and China with distributed shipping from three US locations ensuring rapid delivery. Free standard shipping applies to orders exceeding $99.