The JBX42516 ST/APC to ST/APC Duplex 9/125 Singlemode Fiber Patch Cable represents a professional-grade solution for fiber optic network connectivity. This 4-meter yellow patch cable is engineered to meet the stringent demands of modern telecommunications infrastructure, data centers, and enterprise networking applications. **Technical Specifications:** This duplex patch cable features a 9/125 singlemode fiber core with G.657.A1 glass fiber technology, optimized for both 1310nm and 1550nm wavelengths. The cable delivers exceptional performance with insertion loss rated at ≤0.35dB (0.15dB typical) and return loss of ≥20dB. Attenuation is specified at 0.25 dB/km (1310nm) or 0.35 dB/km (1550nm), ensuring minimal signal degradation over distance. **Key Features:** - Duplex configuration with ST/APC connectors for Type A to B crossover connectivity - 1.8mm outside diameter for easy installation in tight spaces - OFNR riser-rated jacketing for safe deployment in building infrastructure - TAA compliant for government and regulated procurement - RoHS/ELV compliant manufacturing - Tested to ANSI/TIA/EIA-455-171-A standards **Applications:** Ideally suited for long-distance signal transmission in telecommunications networks, data center interconnects, and fiber-to-the-premises (FTTP) installations. The singlemode construction supports higher bandwidth and longer distances compared to multimode alternatives, making it essential for carrier-grade deployments. **Advantages:** The ST/APC connector design provides superior return loss characteristics, reducing signal reflections and improving overall network quality. The yellow jacket aids in easy identification and organization within complex cable infrastructure. Custom lengths are available for specific installation requirements. **Compliance & Warranty:** Backedby a 90-day limited warranty and full compliance with international standards including RoHS Directive 2002/95/EC. Ships from multiple US locations with free standard shipping on orders exceeding $99.