The JBX42246 4m LC/APC to ST/UPC Duplex Singlemode Fiber Patch Cable represents a robust solution for professionals requiring reliable, high-performance fiber optic connectivity. This cable is engineered to stringent industry specifications and delivers the performance characteristics necessary for mission-critical network applications. **Technical Excellence** Features a 9/125 singlemode core constructed from G.657.A1 glass fiber, a specification developed specifically to support bend-insensitive applications without compromising performance. The cable achieves exceptional insertion loss of ≤0.35dB (typical 0.15dB) and return loss ≥20dB, tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards. Attenuation performance is rated at 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm, ensuring minimal signal degradation across standard telecommunications wavelengths. **Durability and Compliance** The 1.8mm outside diameter with yellow OFNR (Optical Fiber Non-conductive Riser) riser-rated jacketing provides superior protection in building installations while maintaining flexibility for routing through tight spaces. Full RoHS/ELV compliance and TAA certification make this cable suitable for government contracting, enterprise deployments, and regulated environments. **Practical Design Features** The Type A to B crossover polarity configuration is the industry-standard for duplex applications, enabling simultaneous bidirectional transmission over two separate fiber strands. The distinctive yellow jacket facilitates quick visual identification during installation and troubleshooting, reducing costly mistakes and installation time. **Versatile Applications** Ideal for telecommunications infrastructure, data center interconnections, campus networks, laboratory environments, and any application requiring single-mode fiber performance. Custom lengths are available for specialized installations, providing flexibility beyond the standard 4-meter configuration. **Value and Support** Shipped from multiple US warehouses (California, Texas, and South Carolina) for rapid delivery, with free standard shipping on orders exceeding $99. Backed by a 90-day limited warranty, ensuring peace of mind for your critical network investments. Manufactured in Taiwan, US, or China with consistent quality standards across all production sources. Whether you're upgrading existing infrastructure or deploying new fiber networks, the JBX42246 delivers professional-grade performance with the reliability demanded by enterprise and institutional customers.