The JBX42621 50m FC/APC to ST/UPC duplex singlemode fiber patch cable represents the gold standard in optical connectivity solutions for telecommunications, data centers, and enterprise network environments. This professional-grade cable delivers exceptional performance through its precision-engineered 9/125 singlemode fiber construction with G.657.A1 specifications. Key Technical Features: The duplex configuration supports two independent optical strands within a single 1.8mm diameter jacket, enabling simultaneous bidirectional communication. The FC/APC (angled physical contact) to ST/UPC (straight physical contact) connector combination provides a versatile solution for mixed-connector environments. Attenuation performance has been rigorously tested—delivering 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm—ensuring reliable long-distance signal transmission with minimal loss. Connector and Polarity: The Type A to B crossover polarity configuration is the industry standard for duplex patch cords, making installation straightforward for experienced technicians. Both connectors feature robust construction designed for multiple mating cycles without degradation. Compliance and Standards: TAA compliance ensures this cable meets U.S. government procurement requirements. RoHS/ELV directives (EU 2002/95/EC) certification confirms environmental safety and hazardous substance restrictions. Testing conducted per ANSI/TIA/EIA-455-171-A-2001 standards guarantees performance consistency. Physical Specifications: The bright yellow OFNR (Optical Fiber Nonconductive Riser) jacket provides flame resistance suitable for building riser installations while offering visual identification in crowded cable trays. The 50-meter length accommodates medium-distance runs, with custom lengths available for specialized applications. Applications: Ideal for connecting telecommunications equipment, network switches, patch panels, and optical transmission systems. Suitable for campus networks, data center implementations, and carrier-grade infrastructure requiring reliable, low-loss optical paths. Value Proposition: Free standard shipping on orders exceeding $99 reduces deployment costs. The 90-day limited warranty provides peace-of-mind protection. Multiple fulfillment locations (Danville CA, Fort Worth TX, Beaufort SC) ensure rapid delivery across the United States.