The JBX42535 70-meter ST/APC to ST/APC duplex singlemode fiber patch cable represents the gold standard in long-distance optical signal transmission. Purpose-built for mission-critical telecommunications, data center interconnects, and enterprise network installations, this cable combines superior optical performance with stringent compliance certifications. **Technical Excellence** This duplex configuration delivers two independent singlemode fiber strands, each with a 9/125 micron core optimized for G.657.A1 specifications. The cable achieves exceptional low insertion loss of ≤0.35dB (typically 0.15dB) and maintains return loss ≥20dB, ensuring minimal signal degradation across the full 70-meter span. Attenuation specifications of 0.25 dB/km at 1310nm and 0.35 dB/km at 1550nm meet or exceed telecommunications industry standards. **Design & Construction** ST/APC connectors feature angled polish geometry that maximizes return loss performance, reducing back-reflection for cleaner signal transmission. The Type A to B crossover polarity configuration represents the most common duplex patch cord standard. A robust 1.8mm diameter yellow OFNR (riser-rated) PVC jacket provides durability in both indoor and riser applications, while maintaining the distinctive yellow color for easy identification in complex cable runs. **Compliance & Certification** TAA compliant designation qualifies this cable for US government, GSA, and federal contractor procurement. RoHS/ELV compliance ensures environmentally responsible manufacturing. Rigorous testing per ANSI/TIA/EIA-455-171-A-2001 standards guarantees consistent optical performance. **Applications** Ideal for telecommunications networks, campus area networks (CANs), metropolitan area networks (MANs), data center backbone connections, and any installation requiring reliable long-distance singlemode transmission. The 70-meter length accommodates building-to-building connectivity and large facility spans. **Logistics & Support** Manufactured across multiple locations (Taiwan, US, China) with domestic shipping from Danville CA, Fort Worth TX, or Beaufort SC. Free standard shipping on orders over $99. Custom lengths available upon request. 90-day limited warranty included.