The JBX42442 55-meter FC/APC to FC/UPC duplex singlemode fiber patch cable represents professional-grade connectivity engineered for critical network infrastructure. This cable is constructed with precision-engineered singlemode fiber featuring a 9/125 micron core diameter and G.657.A1 specifications, ensuring optimal performance for long-distance signal transmission. **Key Performance Features:** The cable delivers exceptional optical characteristics with insertion loss measured at ≤0.35dB (typical 0.15dB) and return loss exceeding 20dB, meeting stringent ANSI/TIA/EIA standards. Attenuation specifications at 1310 nm achieve 0.25 dB/km, while 1550 nm attenuation reaches 0.35 dB/km, making it ideal for both traditional and modern wavelength division multiplexing applications. **Design & Safety:** Featuring a distinctive yellow OFNR (Optical Fiber Non-conductive Riser) rated jacket with 1.8mm outside diameter, this cable balances visibility and compact installation. The crossover Type A to B polarity configuration ensures seamless integration with standard duplex patch cord setups. RoHS and ELV compliant, TAA certified for government procurement. **Applications:** Perfect for telecommunications networks, data centers, enterprise environments, and any application requiring reliable singlemode fiber connectivity over extended distances. The 55-meter length accommodates substantial backbone and inter-cabinet connections. **Specifications:** - Length: 55 meters - Connectors: FC/APC to FC/UPC - Core: 9/125 Singlemode - Fiber Grade: G.657.A1 - Jacket: OFNR Riser-Rated - Color: Yellow - Insertion Loss: ≤0.35dB - Return Loss: ≥20dB - Warranty: 90-Day Limited **Custom Availability:** Custom lengths available upon request. Ships from Danville CA, Fort Worth TX, or Beaufort SC with free standard shipping on orders exceeding $99. Backed by comprehensive product support and a 90-day limited warranty.