The JBX42667 5-meter FC/APC to LC/UPC duplex singlemode fiber patch cable is engineered for telecommunications professionals and network administrators seeking reliable, standards-compliant connectivity solutions. This high-performance optical cable delivers exceptional signal transmission with carefully specified performance metrics that exceed industry requirements. **Technical Excellence:** Built with 9/125 singlemode fiber core and G.657.A1 glass specifications, this duplex patch cable supports both 1310nm and 1550nm wavelengths with minimal attenuation (0.25 dB/km and 0.35 dB/km respectively). The insertion loss specification of ≤0.35dB (typical 0.15dB) ensures signal integrity over extended network runs, while ≥20dB return loss prevents signal reflections that degrade performance. **Certified Compliance:** TAA-compliant and fully RoHS/ELV certified per EU directive 2002/95/EC, this cable meets government procurement standards and environmental regulations. Manufactured with precision in Taiwan, US, or China locations, each unit undergoes rigorous attenuation testing per ANSI/TIA/EIA-455-171-A-2001 standards. **Professional Design Features:** The bright yellow OFNR-rated (riser rated) outer jacket provides 1.8mm diameter protection, easy identification in complex cable environments, and compliance with building codes. Type A to B crossover polarity configuration accommodates the most common duplex patch cord applications. The 10x10x10 case packaging protects cables during storage and transport. **Flexible Solutions:** While this product provides 5-meter length, custom lengths are available for specialized installations. Multiple U.S. warehouses in Danville, CA, Fort Worth, TX, and Beaufort, SC ensure fast domestic shipping with free standard delivery on orders exceeding $99. **Backed by Warranty:** A comprehensive 90-day limited warranty provides peace of mind for critical network installations. Ideal for data centers, telecommunications hubs, fiber-to-the-home deployments, and enterprise backbone networks requiring certified, high-performance optical connectivity.