The JBX42745 ST/APC to LC/UPC Duplex Singlemode Fiber Patch Cable represents a professional-grade solution for modern fiber optic network installations. At 70 meters in length, this cable accommodates medium-distance connections commonly required in enterprise data centers, telecommunications facilities, and campus network deployments. **Technical Specifications & Performance:** This duplex cable features dual 9/125 singlemode fiber strands with G.657.A1 specification, delivering exceptional signal integrity across telecommunications wavelengths. The cable achieves insertion loss specifications of ≤0.35dB (0.15dB typical) and return loss ≥20dB, ensuring minimal signal degradation. Attenuation rates of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm comply with ANSI/TIA/EIA-455-171-A-2001 standards, making it suitable for long-haul and metropolitan area network applications. **Construction & Durability:** The cable's 1.8mm outside diameter with OFNR (Optical Fiber Non-conductive Riser) jacketing provides flame-resistant properties required by building codes while remaining lightweight for easy installation. The plastic accessory construction minimizes electromagnetic interference, critical for sensitive telecommunications environments. RoHS and ELV directive compliance ensure environmental responsibility without compromising performance. **Connector Configuration:** The ST/APC (Angled Physical Contact) to LC/UPC (Straight) connection follows Type A to B crossover polarity, the industry standard for duplex patch cord applications. This configuration ensures proper signal routing in bidirectional communication systems. **Compliance & Warranty:** TAA (Trade Agreements Act) compliant, this cable meets U.S. federal procurement requirements. The 90-day limited warranty and convenient shipping from multiple U.S. locations (Danville CA, Fort Worth TX, Beaufort SC) ensure reliability and rapid delivery. Free standard shipping applies to orders exceeding $99. **Applications:** Ideal for telecommunications infrastructure, data center backbone connections, network equipment interconnections, and telecommunications closet routing. The 70-meter length accommodates moderate distances without requiring repeaters or signal amplification.