The JBX42486 4-meter ST/APC to ST/UPC duplex singlemode fiber patch cable represents a professional-grade solution for demanding network infrastructure applications. Engineered with precision connectors and premium optical fiber, this cable delivers consistent performance for telecommunications, data center, and enterprise network installations. **Technical Specifications:** This duplex configuration features two independent 9/125 singlemode fiber strands, each capable of transmitting signals across long distances with minimal loss. The G.657.A1 glass fiber specification provides enhanced bend radius performance, improving installation flexibility without compromising signal integrity. With tested insertion loss of ≤0.35dB (0.15dB typical) and return loss ≥20dB, the cable exceeds industry standards for optical performance. Attenuation measurements conform to rigorous ANSI/TIA/EIA-455-171-A standards, achieving 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm. The 1.8mm outside diameter yellow jacket is rated OFNR (Optical Fiber Non-conductive Riser), suitable for vertical runs in building risers and various installation environments. **Key Features:** - Type A to B crossover polarity (most common for duplex applications) - TAA compliant for government procurement requirements - RoHS/ELV directive compliance for environmental responsibility - Dual-strand duplex configuration for simultaneous bidirectional transmission - Yellow color-coded jacket for easy identification and organization **Applications:** Ideal for connecting network equipment, telecommunications switches, optical terminals, and data center infrastructure. Perfect for LANs, WANs, campus networks, and fiber-to-the-premises installations requiring reliable single-mode transmission. **Ordering & Support:** Available with free standard shipping on orders exceeding $99, shipped from convenient U.S. locations (Danville CA, Fort Worth TX, or Beaufort SC). Custom lengths available to meet specific project requirements. Backed by a 90-day limited warranty ensuring peace of mind for your network investment. Whether upgrading existing infrastructure or deploying new fiber networks, the JBX42486 delivers professional-grade performance with proven reliability and full compliance documentation.