The JBX42552 ST/APC to FC/UPC duplex singlemode fiber patch cable represents a premium solution for professional-grade optical networking infrastructure. Spanning 10 meters, this duplex configuration accommodates simultaneous bidirectional signal transmission, making it ideal for applications requiring full-duplex communication paths in data centers, telecommunications facilities, and enterprise networks. Key Performance Specifications: This cable features 9/125 singlemode fiber cores engineered to G.657.A1 specifications, providing superior bend performance without compromising signal quality. The ST/APC connector termination offers 20dB return loss, while the FC/UPC connector maintains industry-standard performance. Tested insertion loss measurements confirm exceptional performance: 0.25dB/km at 1310nm and 0.35dB/km at 1550nm, ensuring minimal signal degradation across extended distances. Typical insertion loss is an impressive 0.15dB, well within the ≤0.35dB maximum specification. Construction & Compliance: Built with OFNR (Optical Fiber Non-conductive Riser) rated jacketing, this cable meets stringent fire-safety requirements for building installations. The compact 1.8mm outside diameter facilitates easy routing through cable trays and conduit systems. Full RoHS/ELV compliance and TAA certification ensure this product meets regulatory requirements for government, educational, and enterprise procurement standards. Applications & Use Cases: Ideal for fiber-to-the-desktop implementations, network backbone connections, and equipment interconnections where low-loss, reliable signal transmission is critical. The distinctive yellow color coding aids in network organization and troubleshooting. Type A to B crossover polarity accommodates standard duplex patch cord installations. Customization & Availability: While this product ships pre-configured at 10 meters, custom lengths are available upon request. Multiple distribution centers in Danville CA, Fort Worth TX, and Beaufort SC ensure rapid domestic shipping. Orders exceeding $99 qualify for free standard shipping. Warranty & Support: Every cable includes a 90-day limited warranty and undergoes rigorous testing per ANSI/TIA/EIA-455-171-A standards, providing confidence in reliability and performance across demanding network environments.