The JBX42495 ST/APC to ST/UPC Duplex Singlemode Fiber Patch Cable represents professional-grade connectivity for mission-critical fiber optic networks. This 20-meter cable is specifically designed to meet the rigorous demands of telecommunications infrastructure, data centers, and enterprise-level network installations. Technical Excellence: Built with 9/125 micron singlemode fiber utilizing G.657.A1 glass specifications, this cable delivers superior signal integrity. The ST/APC to ST/UPC connector configuration with Type A to B crossover polarity is the industry standard for duplex patch cord applications. Insertion loss is exceptionally low at ≤0.35dB (0.15dB typical), with return loss exceeding 20dB, ensuring minimal signal degradation across both 1310nm and 1550nm wavelengths. Construction and Durability: The 1.8mm outer diameter yellow jacket is OFNR-rated (Riser Rated), providing flame resistance suitable for building plenum installations. The bright yellow color offers superior cable identification in dense cable environments, reducing installation errors and simplifying future maintenance. Compliance and Standards: TAA compliant for government procurement contracts. RoHS and ELV directive 2002/95/EC certified, meeting environmental and safety regulations. All attenuation measurements are tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards, guaranteeing performance consistency. Flexibility and Support: Available in custom lengths to meet specific installation requirements. Ships from strategically located US facilities (California, Texas, South Carolina) ensuring rapid delivery. Includes 90-day limited warranty covering defects in materials and workmanship. Applications: Ideal for fiber-to-the-desktop installations, network equipment interconnections, telecommunications closet patching, and disaster recovery systems where signal quality cannot be compromised. The duplex configuration supports simultaneous bidirectional communication, essential for full-duplex network protocols.