The JBX43259 40-meter LC/APC to ST/UPC simplex singlemode fiber patch cable represents premium telecommunications infrastructure for discerning network professionals. This cable combines superior optical performance with practical engineering for reliable fiber optic signal transmission in demanding applications. **Core Specifications & Performance:** Built on a 9/125 singlemode fiber core utilizing G.657.A1 glass fiber technology, this cable delivers exceptional optical performance. The insertion loss specification of ≤0.35dB (with typical performance of 0.15dB) and return loss of ≥20dB exceed industry standards, ensuring minimal signal degradation over the 40-meter span. Attenuation testing confirms compliance with ANSI/TIA/EIA-455-171-A-2001 standards, measuring 0.25 dB/km at 1310 nm and 0.35 dB/km at 1550 nm. **Connector Technology:** The LC/APC to ST/UPC connector combination provides optimal flexibility for mixed-equipment environments. LC/APC connectors offer superior return loss performance, while ST/UPC connectivity ensures broad compatibility with legacy and current infrastructure. Straight-through polarity simplifies installation and reduces configuration errors. **Installation & Durability:** The 1.8mm outer diameter jacketing (OFNR riser-rated) provides flame protection while maintaining flexibility for challenging routing scenarios. The durable plastic and rubber materials withstand repetitive handling during installation and maintenance. Available in custom lengths, this cable adapts to your specific topology requirements. **Compliance & Standards:** Fully TAA compliant and manufactured to RoHS/ELV directives (EU 2002/95/EC), ensuring environmental responsibility and government procurement eligibility. Multi-source manufacturing from Taiwan, US, and China guarantees supply chain resilience. **Ideal Applications:** Perfect for data center interconnects, telecommunications networks, CATV systems, and enterprise network upgrades. The 40-meter length accommodates medium-distance runs while maintaining optical integrity. **Warranty & Support:** Included 90-day limited warranty provides confidence in your investment. Ships from multiple US locations (Danville CA, Fort Worth TX, Beaufort SC) with free standard shipping on orders exceeding $99.