The JBX42549 7-meter ST/APC to FC/UPC Duplex Singlemode Fiber Patch Cable represents a premium solution for telecommunications and data center applications requiring reliable, high-performance optical connectivity. **Technical Excellence:** This duplex patch cable utilizes a 9/125 singlemode fiber core with G.657.A1 glass fiber specifications, ensuring compatibility with modern fiber infrastructure. The cable achieves exceptional performance metrics with typical insertion loss of 0.15dB and maximum insertion loss of ≤0.35dB across standard wavelengths (1310nm and 1550nm). Return loss specifications of ≥20dB guarantee signal integrity for critical applications. **Construction & Durability:** The 1.8mm outside diameter yellow jacket is OFNR riser-rated, meeting fire safety codes for installation in building risers. The ST/APC connector on one end and FC/UPC connector on the other provide flexibility for connecting diverse equipment types. Type A to B crossover polarity is the industry-standard configuration for duplex patch cords. **Compliance & Certification:** TAA compliant and RoHS/ELV certified per EU Directive 2002/95/EC, this cable meets government procurement requirements and environmental standards. Manufacturing in Taiwan, the US, and China ensures supply chain reliability with multiple distribution points across the United States. **Practical Benefits:** The distinctive yellow coloring aids in network organization and troubleshooting. Available in custom lengths for specific applications, this cable scales from standard 7m configurations to tailored solutions. A 90-day limited warranty provides confidence in purchase. **Applications:** Ideal for backbone connections, telecommunications closets, data center interconnects, and any installation requiring singlemode fiber transmission. The duplex configuration supports bidirectional communication in single cable runs. **Shipping & Support:** Free standard shipping on orders exceeding $99, with fulfillment from multiple U.S. locations ensures quick delivery. Professional support is available for custom specifications or bulk requirements.