The JBX42539 90-meter ST/APC duplex singlemode fiber patch cable represents a critical infrastructure component for modern telecommunications networks, data centers, and enterprise connectivity solutions. This professionally-engineered cable delivers the reliability and performance standards demanded by network professionals and system integrators. **Superior Optical Performance** Constructed with 9/125 singlemode fiber featuring G.657.A1 glass composition, this cable delivers exceptional optical characteristics. The measured insertion loss of ≤0.35dB (with typical performance of 0.15dB) ensures minimal signal degradation over extended runs. Return loss specifications of ≥20dB provide superior signal integrity, critical for high-speed data transmission. Independent testing per ANSI/TIA/EIA-455-171-A-2001 standards validates performance at both 1310nm and 1550nm wavelengths, supporting diverse application requirements. **Robust Construction and Installation** The yellow OFNR-rated (Riser Rated) jacket provides flame-retardant protection suitable for vertical cable runs through building risers. The compact 1.8mm outside diameter facilitates routing through crowded conduits and cable trays while the distinctive yellow color enhances cable identification in complex installations. ST/APC connectors on both ends with Type A to B crossover polarity ensure immediate compatibility with existing duplex infrastructure. **Compliance and Standards** Fully TAA-compliant and RoHS/ELV certified per EU Directive 2002/95/EC, this cable meets stringent government procurement requirements. Available in multiple manufacturing locations (Taiwan, US, China), ensuring consistent global supply and quality standards. **Flexible Deployment Options** While the standard 90m configuration addresses most backbone and inter-floor applications, custom lengths are available to match specific installation requirements. The 90-day limited warranty provides added confidence in system reliability. **Ideal Applications** Perfect for telecom closet interconnections, campus backbone networks, data center equipment connectivity, and long-distance patch runs requiring minimal signal loss. The duplex configuration enables bidirectional communication in a single cable assembly, simplifying installation while reducing cable count. **Value and Support** With free standard shipping on orders exceeding $99 and availability from multiple US distribution centers (Danville CA, Fort Worth TX, Beaufort SC), rapid deployment is assured for time-sensitive projects.