The JBX42597 80-meter ST/APC to FC/APC duplex singlemode fiber patch cable represents professional-grade connectivity for telecommunications, data center, and enterprise network applications. This cable is manufactured to strict industry standards and undergoes rigorous attenuation testing in accordance with ANSI/TIA/EIA-455-171-A-2001 specifications. **Technical Performance:** The cable features a 9/125 singlemode fiber core constructed from G.657.A1 grade glass fiber, ensuring compatibility with modern optical networks. Attenuation is measured at 1310 nm: 0.25 dB/km and 1550 nm: 0.35 dB/km, providing excellent signal preservation across standard telecommunications wavelengths. Typical insertion loss is just 0.15dB with a maximum of 0.35dB, while return loss exceeds 20dB—both critical metrics for signal quality and system reliability. **Durability and Compliance:** The distinctive yellow outer jacket is OFNR (Optical Fiber Nonconductive Riser) rated, meeting fire safety codes for in-building use. The cable complies with EU Directive 2002/95/EC (RoHS) and carries TAA certification for government and defense procurement eligibility. Manufactured in Taiwan, the United States, or China, this cable maintains consistent quality regardless of origin. **Practical Applications:** Ideal for inter-equipment connections, backbone runs, and patch panel deployments, the duplex configuration simultaneously supports bidirectional communication. The Type A to B crossover polarity is standard for duplex patch cords, eliminating confusion in installation. Custom lengths are available to meet specific deployment requirements. **Installation and Support:** The 1.8mm outside diameter provides flexibility for tight installations while maintaining structural integrity. Ships from multiple U.S. locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99. Includes a 90-day limited warranty covering manufacturing defects. Whether upgrading existing infrastructure or deploying new networks, this cable delivers the performance and reliability network professionals demand.