The JBX42562 55-meter ST/APC to FC/UPC duplex singlemode fiber patch cable represents professional-grade connectivity solutions for modern network infrastructure. Designed to meet stringent telecommunications standards, this cable delivers reliable, high-speed signal transmission over extended distances. Technical Excellence: Featuring 9/125 singlemode fiber construction with G.657.A1 specifications, this cable supports both 1310nm and 1550nm wavelengths with minimal attenuation (0.25 dB/km at 1310nm, 0.35 dB/km at 1550nm). The ≤0.35dB insertion loss and ≥20dB return loss ensure signal integrity critical for long-distance telecommunications, metropolitan area networks, and enterprise data center applications. Connector Configuration: The ST/APC to FC/UPC connector pairing with Type A to B crossover polarity represents the most common duplex patch cord configuration, eliminating guesswork during installation. ST connectors feature angled physical contact (APC) polished finishes, while FC connectors utilize ultra-polished contact (UPC) for optimal performance in high-density installations. Safety and Compliance: The 1.8mm diameter cable features OFNR (riser) rated jacketing, meeting fire safety codes for vertical building runs. Yellow jacket coloring improves visibility and simplifies cable management in complex installations. Complete RoHS/ELV and TAA compliance ensures procurement eligibility for government contracts and enterprise organizations. Installation and Support: Offering 55 meters of ready-to-deploy connectivity, this cable eliminates field splicing needs. Custom length availability accommodates specific installation requirements. Ships from three US distribution centers for rapid delivery, with free shipping on orders exceeding $99. Backed by a 90-day limited warranty and tested to ANSI/TIA/EIA standards. Ideal Applications: Telecommunications networks, data centers, campus backbone connections, and high-speed LAN installations requiring singlemode fiber's superior distance and bandwidth capabilities.