The JBX89186 4m SC/ST Duplex Singlemode Fiber Patch Cable represents a professional-grade solution for mission-critical fiber optic network installations. This carefully engineered cable combines precision manufacturing with superior optical performance, making it an ideal choice for telecommunications carriers, data center operators, and enterprise IT departments. **Optical Performance & Specifications:** Built with dual 9/125 micron singlemode fiber strands, this cable delivers exceptional optical characteristics. The insertion loss specification of ≤0.35dB (with typical performance at 0.15dB) ensures minimal signal degradation over the 4-meter length. Return loss exceeding ≥20dB provides excellent signal integrity, while attenuation rates of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm meet carrier-class standards for both traditional and modern wavelength divisions. **Connector Architecture:** The SC/UPC to ST/UPC connector configuration with Type A to B crossover polarity represents the industry standard for duplex patch cord applications. This design ensures seamless integration with existing telecommunications infrastructure and network equipment. Both connector types feature physical contact (UPC) geometry, optimizing return loss and minimizing reflections for cleaner signal transmission. **Cable Construction & Durability:** The G.657.A1 glass fiber core provides excellent bend performance without compromising optical quality. The 1.8mm outside diameter jacketing utilizes OFNR (Optical Fiber Non-Conductive Riser) rated material, meeting fire safety codes for vertical cable installations while remaining cost-effective for horizontal runs. Plastic accessory components ensure lightweight handling without sacrificing durability. **Compliance & Quality Assurance:** This cable meets rigorous industry standards, including ANSI/TIA/EIA-455-171-A-2001 attenuation testing requirements. TAA (Trade Agreements Act) compliance ensures eligibility for government and institutional procurement. RoHS/ELV directives compliance demonstrates environmental responsibility. The 90-day limited warranty provides peace of mind for critical installations. **Applications & Use Cases:** Ideal for telecommunications networks, data center interconnects, campus area networks (CANs), and fiber-to-the-premise (FTTP) deployments. The purple color facilitates efficient cable management and visual identification in complex network environments. Available in custom lengths for specialized routing requirements. **Shipping & Convenience:** Ships from multiple U.S. locations (California, Texas, and South Carolina) for rapid delivery. Free standard shipping applies to orders exceeding $99, making bulk purchases particularly economical.