The JBX42205 70m LC/APC to FC/UPC duplex singlemode fiber patch cable represents professional-grade connectivity for mission-critical telecommunications and data center applications. This carefully engineered solution bridges different connector types while maintaining exceptional signal quality over extended distances. Technical Specifications: This cable features a 9/125 singlemode fiber core constructed from G.657.A1 glass fiber, the industry standard for long-distance, low-loss signal transmission. The 70-meter length makes it suitable for connecting equipment across large facilities, server rooms, or telecommunications equipment layouts. With a compact 1.8mm outside diameter, the cable routes easily through existing cable trays and conduit without excessive bulk. Performance Characteristics: The duplex configuration provides two independent fiber strands enabling full-duplex communication—simultaneous two-way transmission essential for modern networking protocols. Insertion loss of ≤0.35dB typical and return loss ≥20dB ensure minimal signal degradation and reflective noise. Attenuation specifications of 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm guarantee performance across standard telecommunications wavelengths. Type A to B crossover polarity is configured as the most common duplex patch cord standard, eliminating confusion during installation. Durability & Safety: The OFNR-rated (Optical Fiber Non-conductive Riser) yellow jacket provides flame resistance and smoke mitigation for indoor building installations. RoHS and ELV compliance ensure the cable meets environmental regulations while TAA compliance makes it eligible for government and federal procurement requirements. Applications: Ideal for enterprise network backbones, data center interconnections, telecommunications central offices, and any environment requiring reliable, long-distance fiber optic connectivity. The LC/APC to FC/UPC configuration accommodates mixed equipment environments common in legacy and modern network infrastructure. Customization & Support: Custom lengths are available for specific installation requirements. The 90-day limited warranty provides confidence in your investment, backed by expedited shipping from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC). Free standard shipping applies to orders exceeding $99, reducing total deployment costs. Installation Tips: Before installation, inspect connectors for dust and debris. Use connector caps when not in use. Avoid excessive bending—maintain minimum bend radius specifications. Test insertion loss with optical power meter or light source/receiver before finalizing connections. Store excess cable in organized spools to prevent tangling and stress.