The JBX42436 25-meter FC/APC to FC/UPC duplex singlemode fiber patch cable represents a reliable solution for professional fiber optic network infrastructure. This cable is engineered to meet the rigorous demands of telecommunications, data centers, and enterprise networking environments. **Technical Specifications:** Built with 9/125 singlemode fiber core utilizing G.657.A1 glass fiber technology, this duplex cable provides exceptional signal integrity. The cable demonstrates outstanding attenuation performance: 0.25 dB/km at 1310 nm or 0.35 dB/km at 1550 nm, with typical insertion loss of just 0.15dB (maximum 0.35dB) and return loss exceeding 20dB. These specifications ensure minimal signal degradation over the 25-meter span, maintaining optimal network performance. **Design and Construction:** The 1.8mm outer diameter jacket provides space-efficient routing through cable trays and conduits. The yellow OFNR (Optical Fiber Non-conductive Riser) rated jacket offers both visual identification and compliance with building safety codes. The Type A to B crossover configuration is the industry standard for duplex patch cords, eliminating compatibility concerns. **Compliance and Standards:** Fully TAA compliant for government procurement requirements, RoHS and ELV directive compliant, and manufactured to ANSI/TIA/EIA-455-171-A-2001 standards for attenuation testing. The cable is available from multiple U.S. manufacturing locations (Taiwan, US, China), ensuring consistent quality and availability. **Applications:** Ideally suited for connecting singlemode fiber equipment in telecom central offices, ISP networks, datacenter interconnects, and long-distance transmission systems. The FC/APC to FC/UPC configuration supports mixed connector environments common in network upgrades and expansions. **Support and Availability:** This cable is available in custom lengths, allowing tailored solutions beyond the standard 25-meter configuration. Backed by a 90-day limited warranty and supported by inventory in Danville CA, Fort Worth TX, and Beaufort SC for rapid deployment. Free standard shipping applies to orders exceeding $99.