The JBX42541 ST/APC to FC/UPC duplex singlemode fiber patch cable represents a professional-grade solution for optical network infrastructure requiring precision, reliability, and regulatory compliance. At 1 meter in length, this cable provides the ideal span for equipment interconnection in server rooms, network closets, and telecommunications facilities. **Technical Specifications & Performance:** This duplex patch cable features dual 9/125 singlemode fiber cores with G.657.A1 glass fiber technology, delivering exceptional optical performance. The cable achieves insertion loss specifications of ≤0.35dB (0.15dB typical) and return loss of ≥20dB, meeting rigorous ANSI/TIA/EIA-455-171-A standards. Attenuation performance of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm ensures signal integrity across standard telecommunications wavelengths. **Design & Construction:** The yellow outer jacket provides easy identification in color-coded network installations while maintaining OFNR riser-rated protection suitable for in-building applications. With a compact 1.8mm outside diameter, the cable offers flexibility for tight cable management installations without compromising durability. The duplex configuration with Type A to B crossover polarity represents the most common standard for duplex patch cord applications. **Compliance & Quality Assurance:** Fully TAA-compliant and RoHS/ELV directive compliant (EU 2002/95/EC), this cable meets government procurement requirements. Manufactured across trusted facilities in Taiwan, USA, and China, the cable comes with a 90-day limited warranty. Available in custom lengths for specialized installations. **Application Scenarios:** Ideal for telecommunications service providers, enterprise data centers, network service providers, and government installations requiring compliant fiber infrastructure. Suitable for backbone cabling, equipment interconnection, and high-reliability optical signal transmission. **Value & Logistics:** Offering free standard shipping on orders exceeding $99, with fulfillment from conveniently located distribution centers in Danville CA, Fort Worth TX, and Beaufort SC, ensuring rapid delivery for critical network upgrades.