The JBX42139 SC/APC to SC/UPC duplex single mode fiber patch cable represents a professional-grade solution for modern network infrastructure. At 40 meters in length, this cable is ideal for medium-distance fiber optic connections within data centers, telecommunications facilities, and enterprise networks. **Technical Excellence** Built with a 9/125 singlemode core using G.657.A1 glass fiber, this patch cable meets rigorous industry standards. The cable has been attenuation-tested in accordance with ANSI/TIA/EIA-455-171-A-2001, ensuring reliable performance. With insertion loss of ≤0.35dB at typical 0.15dB and return loss ≥20dB, this cable minimizes signal degradation. The outer diameter of 1.8mm provides a compact form factor suitable for high-density patching scenarios. **Connector Configuration** The SC/APC to SC/UPC duplex configuration with Type A to B crossover polarity represents the most common standard for duplex patch cords. This ensures seamless integration with existing network infrastructure and eliminates compatibility concerns. Both connector types deliver exceptional optical performance and durability. **Compliance & Safety** TAA (Trade Agreements Act) compliant and certified to EU directive 2002/95/EC (RoHS), this cable meets government procurement and environmental standards. The OFNR (Optical Fiber Non-Conductive Riser) rating ensures safe installation in vertical cable runs and plenum spaces where fire safety codes are enforced. **Practical Advantages** The bright yellow jacket provides superior cable identification in complex wiring environments, reducing installation and troubleshooting time. Available in custom lengths to match your specific installation requirements, this cable offers flexibility beyond standard configurations. Ships from three U.S. locations (Danville CA, Fort Worth TX, and Beaufort SC) with free standard shipping on orders exceeding $99. **Ideal Applications** Perfect for data center interconnections, telecommunications networks, enterprise campus backbones, and broadcast facilities. Whether you're upgrading existing infrastructure or deploying new fiber networks, this patch cable delivers professional-grade reliability at competitive pricing. **Warranty & Support** Included 90-day limited warranty provides peace of mind on your network investment. Made with durable plastic accessories and manufactured in Taiwan, the US, or China for consistent quality.