The JBX42550 ST/APC to FC/UPC Duplex Singlemode Fiber Patch Cable represents a premium solution for connecting fiber-optic network components in demanding professional environments. This 8-meter cable is engineered to deliver reliable, high-speed data transmission for telecommunications, data centers, and enterprise network installations. **Technical Excellence:** Featuring a 9/125 singlemode core with G.657.A1 glass fiber, this duplex patch cable ensures minimal signal loss and maximum transmission distance. The cable achieves insertion loss of just 0.15dB typical (≤0.35dB maximum) and return loss ≥20dB, meeting ANSI/TIA/EIA standards for attenuation testing. Performance specifications include 0.25 dB/km attenuation at 1310nm and 0.35 dB/km at 1550nm, supporting both legacy and modern fiber networks. **Professional Design:** The Type A to B crossover polarity configuration represents the most common duplex patch cord standard, ensuring seamless integration with existing network infrastructure. The OFNR riser-rated jacketing provides fire-resistant protection suitable for in-building installations, while the 1.8mm outside diameter enables flexible routing through tight spaces and cable trays. The distinctive yellow jacket aids in network organization and rapid cable identification during maintenance. **Compliance and Reliability:** TAA compliant and RoHS certified, this cable meets regulatory requirements for government and enterprise procurement. The robust plastic accessories and quality construction provide durability in both indoor and temperature-controlled environments. Custom lengths are available for specialized installations requiring non-standard configurations. **Value and Support:** Shipped from multiple U.S. locations for fast delivery with free standard shipping on orders over $99. Each cable includes a 90-day limited warranty, and the 10x10x10 case packaging ensures secure transport. Ideal for network technicians, IT professionals, and integrators requiring reliable fiber connectivity solutions. **Applications:** Perfect for connecting fiber switches, routers, patch panels, and transceivers in telecommunications networks, data centers, and enterprise systems. The singlemode design supports long-distance, high-bandwidth applications where signal integrity is paramount.