The JBX42555 20-meter ST/APC to FC/UPC duplex singlemode fiber patch cable represents enterprise-class connectivity designed for mission-critical network infrastructure. This professional-grade cable delivers exceptional performance with specifications that exceed industry standards, making it the preferred choice for data centers, telecommunications operations, and high-reliability network installations. Technical Excellence: This cable features G.657.A1 glass fiber with a 9/125 singlemode core configuration, delivering industry-leading performance characteristics. With insertion loss of ≤0.35dB at typical levels (0.15dB) and return loss of ≥20dB, signal degradation is minimized, ensuring clear, reliable data transmission. Attenuation specifications are rated at 1310 nm (0.25 dB/km) and 1550 nm (0.35 dB/km), supporting both standard and extended wavelength applications. Design and Safety: The compact 1.8mm outside diameter enables flexible routing through tight spaces and cable management systems. The yellow OFNR (Optical Fiber Non-conductive Riser) rated jacket provides enhanced fire safety for in-building installations while offering superior visibility for quick identification and maintenance. The duplex configuration with Type A to B crossover polarity is the industry-standard specification for most applications. Compliance and Reliability: Full TAA compliance ensures government and institutional procurement eligibility. RoHS/ELV certification confirms environmental responsibility and reduced hazardous materials. Comprehensive testing follows ANSI/TIA/EIA-455-171-A-2001 standards, guaranteeing consistent quality and performance. Flexibility and Support: Custom length options are available for specific installation requirements beyond the standard 20-meter offering. The 90-day limited warranty provides peace-of-mind protection. With free standard shipping on orders exceeding $99 and multiple US-based fulfillment locations (Danville CA, Fort Worth TX, Beaufort SC), fast delivery is assured. Applications: Ideal for telecommunications networks, data center interconnects, equipment upgrades, and fiber optic network expansions where performance and reliability are non-negotiable.