The JBX42480 ST/APC to ST/UPC duplex singlemode fiber patch cable represents professional-grade connectivity solutions for modern network infrastructure. Manufactured with precision engineering, this 0.5-meter cable features a Type A to B crossover polarity configuration, the industry-standard arrangement for duplex patch cords, ensuring compatibility with existing network topologies. **Technical Specifications:** Constructed with 9/125 singlemode fiber and G.657.A1 glass composition, this cable delivers superior performance metrics including insertion loss of ≤0.35dB (typical 0.15dB) and return loss exceeding 20dB. Attenuation specifications of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm enable reliable long-distance signal transmission without signal degradation. **Key Features:** The bright yellow OFNR-rated jacket provides exceptional visibility for network management while meeting commercial fire safety standards. Its compact 1.8mm outside diameter enables efficient cable management in high-density environments. ST/APC and ST/UPC connector termination ensures reliable connections with minimal back-reflection losses. **Compliance & Standards:** Fully TAA-compliant and manufactured in Taiwan, United States, or China, this cable adheres to RoHS/ELV directives and ANSI/TIA/EIA-455-171-A-2001 attenuation testing standards. The 90-day limited warranty provides peace of mind for critical installations. **Applications:** Ideal for telecommunications facilities, data centers, telecommunications closets, and enterprise network environments requiring duplex singlemode connectivity. Custom lengths available for specialized deployment requirements. Ships from multiple US locations with free standard shipping on orders exceeding $99. **End Use:** Designed specifically for transmitting fiber signals in applications demanding lowest insertion loss and highest reliability. The crossover polarity configuration accommodates bidirectional communication on separate fiber strands, making this cable essential for full-duplex network operations.