The JBX42556 25-meter ST/APC to FC/UPC duplex singlemode fiber patch cable represents a professional-grade solution for demanding optical networking environments. Engineered with precision manufacturing and rigorous testing standards, this cable delivers exceptional performance in telecommunications infrastructure, data centers, and network backbone applications. Technical Excellence: This duplex patch cable features a 9/125 singlemode fiber core constructed from G.657.A1 glass, which provides superior bend performance and low attenuation characteristics. At 1310 nm, the cable achieves 0.25 dB/km attenuation, while at 1550 nm it reaches 0.35 dB/km—both well within industry standards for long-distance signal transmission. The measured insertion loss of ≤0.35dB (with typical values of 0.15dB) ensures minimal power loss across the connection, critical for maintaining signal strength in extended network runs. Connector Configuration: The Type A to B crossover polarity configuration is the industry standard for duplex patch cords, enabling seamless integration with existing network infrastructure. ST/APC connectors provide angled physical contact for reduced back reflection, while FC/UPC connectors deliver standard physical contact performance, offering flexibility in network topology design. Installation & Safety: The OFNR (Optical Fiber Nonconductive Riser) rated jacket ensures compliance with building codes and safety regulations, making it suitable for installation in vertical runs between floors. The bright yellow outer jacket facilitates rapid identification during installation and maintenance, reducing downtime and troubleshooting time. Compliance & Reliability: Fully TAA-compliant and manufactured in accordance with ANSI/TIA/EIA standards, this cable meets all federal procurement requirements. The 90-day limited warranty provides comprehensive protection. Custom lengths are available for specialized applications requiring non-standard configurations. Applications: • Data center interconnects • Telecom backbone networks • Building infrastructure fiber runs • Equipment-to-patch panel connections • Disaster recovery network links With free standard shipping on orders exceeding $99, the JBX42556 delivers professional-grade performance at competitive pricing.