The JBX42253 12-meter LC/APC to ST/UPC duplex singlemode fiber patch cable represents a premium solution for professional fiber optic installations. Engineered to meet demanding telecommunications and data center standards, this cable combines precision engineering with reliable performance. **Key Specifications:** With a 9/125 singlemode fiber core and G.657.A1 glass specifications, this duplex patch cable delivers superior signal quality over extended distances. The LC/APC to ST/UPC connector configuration provides Type A to B crossover polarity—the most common standard for duplex patch cord applications. Insertion loss is remarkably low at ≤0.35dB (typical 0.15dB), with return loss exceeding 20dB, ensuring minimal signal degradation. **Technical Performance:** Attenuation levels of 0.25 dB/km at 1310nm or 0.35 dB/km at 1550nm make this cable suitable for both short and intermediate-distance runs. Testing conducted per ANSI/TIA/EIA-455-171-A-2001 standards confirms consistent performance and quality assurance. **Build Quality & Compliance:** The yellow OFNR (riser-rated) jacket provides durability while maintaining flexibility for installation in conduit and cable trays. TAA compliance ensures government procurement eligibility. RoHS/ELV certification demonstrates environmental responsibility. The 1.8mm outside diameter allows space-efficient routing in crowded equipment racks. **Applications:** Ideal for telecommunications networks, data center interconnects, campus backbone installations, and any scenario requiring reliable singlemode fiber connectivity. The Type A to B crossover configuration makes this an excellent choice for connecting different equipment types. **Warranty & Support:** Backed by a 90-day limited warranty and available in custom lengths for specialized installations. Ships from multiple U.S. locations (California, Texas, South Carolina) with free standard shipping on orders over $99. **Why Choose This Cable:** Combining TAA compliance, superior performance metrics, and professional construction, this fiber patch cable delivers enterprise-grade reliability at a competitive price point.