The JBX93156 4-meter SC/SC duplex singlemode fiber patch cable represents a premium solution for professional optical network installations. This cable is engineered to meet the stringent demands of modern telecommunications infrastructure, delivering reliable performance in mission-critical applications. **Core Features:** Built with a 9/125 micron singlemode fiber core utilizing G.657.A1 glass specifications, this patch cable supports both 1310nm and 1550nm wavelengths with exceptional attenuation characteristics (1310nm: 0.25dB/km or 1550nm: 0.35dB/km). The duplex configuration provides bi-directional communication capability while maintaining compact form factor. **Performance Specifications:** Insertion loss is rigorously tested to ≤0.35dB (typical 0.15dB), while return loss exceeds 20dB, ensuring minimal signal degradation and excellent signal reflection suppression. SC/UPC connectors with Type A to B crossover polarity enable seamless integration into standard network architectures. **Construction & Durability:** The 1.8mm outer diameter jacketing is rated OFNR (Optical Fiber Non-conductive Riser), providing flame resistance and compliance with building safety codes. TAA compliance ensures eligibility for government and federal procurement programs. Materials meet RoHS/ELV directives (EU 2002/95/EC). **Applications:** Perfectly suited for data centers, telecommunications hubs, enterprise networks, and fiber backhaul systems. The singlemode configuration enables long-distance transmission with minimal dispersion, making it ideal for both local area network (LAN) extensions and wide area network (WAN) deployments. **Quality Assurance:** All cables are attenuation-tested per ANSI/TIA/EIA-455-171-A-2001 standards. Backed by a 90-day limited warranty. Custom lengths available upon request for specialized installations. Ships from three distribution centers (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders over $99.