The JBX42598 85-meter ST/APC to FC/APC duplex singlemode fiber patch cable is engineered for mission-critical network applications requiring precision, reliability, and regulatory compliance. This professional-grade interconnect solution combines superior optical performance with practical durability for demanding telecommunications environments. **Technical Specifications:** This duplex fiber patch cable features a 9/125 singlemode core with G.657.A1 glass fiber composition, designed to minimize signal degradation over extended distances. The cable achieves exceptional insertion loss ratings of ≤0.35dB (with typical performance at 0.15dB) and return loss of ≥20dB, meeting stringent ANSI/TIA/EIA standards. Attenuation rates of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm ensure optimal performance across telecommunications wavelengths. **Connector Configuration:** The ST/APC to FC/APC duplex configuration with Type A to B crossover polarity provides the most common and versatile connection pattern for duplex patch cord applications. Both connector types feature angled polish (APC) surfaces that reduce return loss and minimize back-reflections, critical for long-distance transmission. **Durability & Compliance:** With a 1.8mm outside diameter and OFNR (riser-rated) yellow PVC jacket, this cable offers excellent protection while maintaining flexibility for installation in tight spaces. The construction is RoHS/ELV compliant and TAA-certified, meeting government procurement standards. Designed for use in transmitting fiber signals in data centers, telecommunications closets, and enterprise network backbones. **Applications:** • Data center interconnections • Long-distance telecommunications • Enterprise network backbones • Telecommunications networks • ISP infrastructure • Campus network installations **Custom Options:** Available in custom lengths to accommodate specific installation requirements. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on qualifying orders. Backed by a 90-day limited warranty ensuring peace of mind in your network investment.