The JBX42255 20-meter LC/APC to ST/UPC duplex singlemode fiber patch cable represents precision optical connectivity for demanding network applications. Constructed with G.657.A1 specifications and a 9/125 micrometer singlemode core, this cable delivers exceptional performance in both legacy and modern fiber-optic systems. **Technical Excellence:** This patch cable demonstrates superior optical characteristics tested in accordance with ANSI/TIA/EIA-455-171-A-2001 standards. Attenuation performance of 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm ensures minimal signal loss, critical for long-distance and high-bandwidth applications. The ≤0.35dB insertion loss and ≥20dB return loss specifications guarantee signal fidelity and reduced reflections. **Connector Configuration:** The LC/APC to ST/UPC connector combination with Type A to B crossover polarity addresses diverse network architectures. LC connectors offer compact form factor benefits, while ST connectors provide proven compatibility with existing infrastructure. APC (angled physical contact) termination on the LC end minimizes reflectance, enhancing overall system performance. **Construction & Safety:** The 1.8mm diameter outer diameter with OFNR (Optical Fiber Non-Conductive Riser) rated yellow jacketing provides both durability and fire safety. The plastic accessory materials ensure lightweight handling while maintaining structural integrity. This construction makes the cable suitable for vertical runs and plenum installations where building codes mandate non-flammable materials. **Compliance & Standards:** TAA (Trade Agreements Act) compliance qualifies this cable for government and federal projects. RoHS/ELV certification ensures environmental responsibility by eliminating hazardous substances. The cable is manufactured with quality control from multiple locations (Taiwan, US, and China), ensuring consistent performance regardless of source. **Practical Applications:** Ideal for telecommunications networks, data centers, enterprise LANs, and service provider installations. The 20-meter length bridges standard building distances without requiring additional splitters. Custom length availability accommodates unique site requirements. **Logistics & Support:** Ships from multiple US locations (Danville, CA; Fort Worth, TX; Beaufort, SC) for faster delivery. Qualify for free standard shipping on orders exceeding $99. The 90-day limited warranty provides customer confidence in product reliability. Whether upgrading legacy systems or deploying new fiber infrastructure, the JBX42255 delivers professional-grade performance with proven reliability and standards compliance.