The JBX42470 55m FC/APC to FC/APC duplex singlemode fiber patch cable is an essential component for professional-grade fiber optic networks requiring reliable, long-distance signal transmission. This cable combines precision engineering with practical functionality, making it ideal for telecommunications infrastructure, data centers, and enterprise networking environments. **Key Technical Features:** Built with 9/125 singlemode fiber and G.657.A1 glass fiber core, this cable provides exceptional performance across industry-standard wavelengths. The duplex configuration supports bidirectional communication through Type A to B crossover polarity, the most common setup for duplex patch cord applications. With an insertion loss specification of ≤0.35dB (typical 0.15dB) and return loss ≥20dB, this cable ensures minimal signal degradation even over its full 55-meter length. **Superior Construction & Safety:** The OFNR riser-rated jacketing is designed for vertical runs in building plenum spaces while maintaining fire safety compliance. The compact 1.8mm outside diameter enables space-efficient routing through cable trays and conduits. RoHS/ELV and TAA compliance certifications make this cable compliant with government procurement standards and environmental regulations. **Practical Advantages:** The distinctive yellow color jacket provides excellent visibility in congested network installations, reducing setup time and maintenance errors. Each cable is individually tested according to ANSI/TIA/EIA-455-171-A standards, ensuring consistent performance characteristics. **Customization & Availability:** Custom length options are available to meet specific installation requirements. The cable ships from multiple U.S. locations (Danville, CA; Fort Worth, TX; Beaufort, SC) with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty, this investment-grade cable provides both performance and peace of mind for mission-critical applications.