The JBX42590 ST/APC to FC/APC duplex singlemode fiber patch cable represents professional-grade connectivity for mission-critical network applications. This 45-meter cable is specifically designed for organizations requiring reliable, long-distance optical signal transmission with minimal attenuation and signal loss. **Technical Specifications:** This duplex patch cable features a 9/125 singlemode fiber core with G.657.A1 glass fiber composition, meeting strict telecommunications standards. The cable delivers exceptional performance with measured attenuation of 0.25 dB/km at 1310 nm or 0.35 dB/km at 1550 nm, and typical insertion loss of just 0.15dB (maximum ≤0.35dB). Return loss specification of ≥20dB ensures signal integrity across long cable runs. **Construction & Durability:** The cable features a flexible 1.8mm outside diameter wrapped in a durable, riser-rated (OFNR) yellow jacket for easy identification and building-code compliance. The distinctive yellow color enhances cable management and traceability in complex network environments. RoHS and ELV directive compliance ensures environmental responsibility. **Connector Configuration:** Featuring ST/APC (straight tip with angled physical contact) to FC/APC connectors in Type A to B crossover configuration—the industry-standard polarity for duplex patch cords. APC connectors provide superior return loss performance compared to UPC alternatives, critical for high-speed networks. **Compliance & Certification:** Fully TAA (Trade Agreements Act) compliant for government and institutional procurement. Attenuation testing follows ANSI/TIA/EIA-455-171-A standards, ensuring reliable performance validation. 90-day limited warranty provides peace of mind. **Applications:** Ideal for telecommunications infrastructure, data center interconnections, broadcast facilities, and enterprise network backbones. Custom lengths available to accommodate specific installation requirements. Ships from multiple US locations with free standard shipping on qualifying orders. **Why Choose This Cable:** Professional-grade construction, superior optical performance, government compliance, and proven reliability make this cable the smart choice for organizations that cannot compromise on network performance or signal integrity.