The JBX42546 ST/APC to FC/UPC duplex singlemode fiber patch cable is engineered for mission-critical network applications requiring exceptional optical performance and reliability. This professional-grade 4-meter cable combines advanced fiber technology with robust construction to meet the demanding requirements of modern telecommunications infrastructure. **Premium Fiber Construction** Utilizing 9/125 singlemode fiber with G.657.A1 bend-optimization technology, this cable delivers superior performance characteristics. The bend-optimized fiber reduces macrobending losses, making it ideal for applications with space constraints or complex routing requirements. Operating at standard telecommunications wavelengths (1310 nm and 1550 nm), the cable achieves exceptional attenuation specifications: 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm. **Superior Optical Performance** Tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards, this patch cable delivers measured insertion loss of ≤0.35dB (0.15dB typical) and return loss ≥20dB. These specifications ensure minimal signal degradation and optimal system performance for long-distance telecommunications, high-speed data transmission, and precision optical applications. **Professional Compliance and Safety** Fully TAA compliant for government procurement requirements, this cable meets EU RoHS/ELV directives and environmental standards. The yellow OFNR (Optical Fiber Non-conductive Riser) jacket ensures safe installation in riser applications throughout commercial buildings while providing excellent color-coding for network organization. **Practical Design Features** The compact 1.8mm outer diameter provides excellent flexibility for cable routing through tight spaces and conduits. Type A to B crossover polarity configuration is optimized for duplex installations, ensuring reliable bidirectional signal transmission. The 5.0mm width accommodates standard cable management systems while maintaining optimal bend radius protection. **Versatile Applications** Ideally suited for data center interconnects, telecommunications infrastructure, laboratory testing, and enterprise network installations. Custom lengths are available for specialized applications requiring non-standard configurations. **Warranty and Support** Backed by a 90-day limited warranty and shipped from multiple U.S. locations for rapid delivery. Orders exceeding $99 qualify for free standard shipping.