The JBX42427 5-meter FC/APC to FC/UPC duplex singlemode fiber patch cable represents a premium solution for demanding optical networking environments. Built to enterprise specifications, this cable delivers the performance reliability required in modern data centers, telecommunications facilities, and high-speed network installations. **Technical Excellence:** Constructed with 9/125 singlemode fiber core and G.657.A1 glass fiber, this cable achieves exceptional optical performance with insertion loss of ≤0.35dB (typical 0.15dB) and return loss exceeding 20dB. Attenuation specifications of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm ensure minimal signal degradation across extended distances. Testing conforms to ANSI/TIA/EIA-455-171-A-2001 standards for verified reliability. **Connector Configuration:** The Type A to B crossover polarity is the industry standard for duplex patch cords, enabling seamless integration with existing infrastructure. FC/APC (angled physical contact) on one end and FC/UPC (ultra physical contact) on the other provides flexibility for diverse network topologies and equipment compatibility. **Quality & Compliance:** OFNR riser-rated jacketing ensures code compliance for building installations while the 1.8mm diameter allows efficient cable management in tight spaces. RoHS/ELV directive compliance and TAA certification meet stringent government and environmental standards. The yellow jacket aids visual identification in complex cable environments. **Practical Advantages:** Available in custom lengths beyond the standard 5m configuration, this cable adapts to any installation requirement. The 90-day limited warranty protects your investment, while multiple US shipping locations ensure rapid delivery with free standard shipping on orders exceeding $99. **Applications:** Ideal for fiber-to-the-desk (FTTD) deployments, equipment interconnects, telecommunications backbone networks, and laboratory fiber optic systems requiring precision signal transmission. The duplex configuration efficiently handles bidirectional communication in modern networking protocols.