The JBX42509 ST/APC to ST/UPC duplex singlemode fiber patch cable represents a premium solution for telecommunications infrastructure requiring exceptional signal integrity and reliability. This 90-meter cable is specifically engineered for long-distance data transmission in single-mode fiber networks. **Technical Excellence** Constructed with 9/125 singlemode core and G.657.A1 glass fiber, this cable delivers industry-leading performance. Insertion loss measurements of ≤0.35dB (0.15dB typical) at 1310nm and 0.35dB/km at 1550nm ensure minimal signal degradation over extended distances. Return loss specifications of ≥20dB provide superior signal reflection control, critical for maintaining network stability. **Design and Construction** The duplex configuration with Type A to B crossover polarity accommodates bidirectional communication, standard for most enterprise installations. The bright yellow jacket provides excellent visibility during installation and maintenance, while OFNR (Optical Fiber Nonconductive Riser) rating ensures compliance with fire safety codes for indoor riser applications. The compact 1.8mm outside diameter simplifies cable management in congested installations. **Compliance and Standards** TAA (Trade Agreements Act) compliance qualifies this cable for government procurement programs. RoHS/ELV directives and attenuation testing per ANSI/TIA/EIA-455-171-A-2001 standards demonstrate commitment to quality and environmental responsibility. **Applications** Ideal for data centers, telecom facilities, enterprise networks, and educational institutions requiring reliable long-distance fiber connectivity. The 90-meter length accommodates most building-to-building connections without intermediate splicing. **Value and Support** Available in custom lengths for specific installation requirements. Ships from three strategic US locations (Danville CA, Fort Worth TX, Beaufort SC) ensuring fast delivery. Free standard shipping on orders exceeding $99 provides cost-effective procurement. Backed by a 90-day limited warranty for peace of mind.