The JBX42126 SC/APC to SC/UPC duplex single mode fiber patch cable represents professional-grade optical connectivity engineered for critical network infrastructure. This 4-meter cable is specifically designed to bridge SC/APC and SC/UPC connector types in a Type A to B crossover configuration—the most common duplex patch cord polarity standard in telecommunications. **Technical Excellence** Featuring a 9/125 singlemode fiber core with G.657.A1 glass fiber construction, this cable delivers superior optical performance. Testing confirms insertion loss of ≤0.35dB at 1550nm (0.15dB typical) and consistent return loss exceeding 20dB, meeting stringent ANSI/TIA/EIA-455-171-A-2001 standards. These specifications ensure minimal signal degradation across long transmission distances, critical for high-speed data applications. **Installation & Durability** The bright yellow OFNR (Optical Fiber Non-conductive Riser) rated jacket provides fire-rated protection essential for in-building installations, particularly in commercial and data center environments. The compact 1.8mm outer diameter facilitates flexible routing through cable trays and conduit systems without sacrificing durability or signal integrity. **Compliance & Standards** TAA compliant and RoHS certified per EU Directive 2002/95/EC, ensuring compatibility with government procurement requirements and environmental regulations. Manufactured in Taiwan, US, or China with rigorous quality control standards. **Applications** Ideal for connecting network equipment, optical switches, and telecommunications infrastructure in campus networks, data centers, and carrier-grade installations. The 4-meter length accommodates moderate equipment separation while minimizing signal loss. **Flexibility & Support** Custom length options available to address specific installation requirements. Includes 90-day limited warranty. Ships with free standard shipping on orders exceeding $99 from strategically located distribution centers.