The JBX42577 ST/APC to FC/APC Duplex Singlemode Fiber Patch Cable is a precision optical interconnect solution engineered for mission-critical telecommunications, data center, and enterprise network environments. This 5-meter cable represents the gold standard for duplex fiber connections, combining superior optical performance with robust construction and regulatory compliance. **Technical Excellence** Utilizing 9/125 singlemode fiber with G.657.A1 glass composition, this cable delivers low-loss signal transmission across industry-standard wavelengths. With insertion loss specifications of ≤0.35dB (0.15dB typical) and return loss ≥20dB, it exceeds industry requirements for minimal signal degradation. The cable undergoes rigorous attenuation testing per ANSI/TIA/EIA-455-171-A-2001 standards, ensuring consistent performance at 1310nm and 1550nm wavelengths. **Connector Architecture** The ST/APC to FC/APC connector pairing with Type A to B crossover polarity configuration represents the most common duplex patch cord standard. ST/APC (straight tip with angled physical contact) connectors minimize reflection losses, while FC/APC terminators ensure secure, stable connections. This combination is ideal for long-distance telecommunications and high-reliability applications. **Installation & Compliance** The bright yellow OFNR (Optical Fiber Non-Conductive Riser) rated jacket provides excellent visibility during installation and meets building code requirements for vertical cable runs and plenum installations. At 1.8mm outside diameter, the cable offers optimal bend radius and installation flexibility. TAA compliant and RoHS/ELV certified (EU directive 2002/95/EC), this cable meets federal procurement standards and international environmental regulations. **Practical Applications** Perfect for telecommunications carriers, ISPs, data center operators, and enterprise IT departments requiring reliable duplex fiber interconnects. Common applications include long-distance metropolitan area networks (MANs), wide area network (WAN) backbone connections, and high-bandwidth telecommunications infrastructure. **Package & Support** Ships from multiple US locations (Danville, CA; Fort Worth, TX; Beaufort, SC) with free standard shipping on orders over $99. Available in custom lengths for specialized installations. Backed by 90-day limited warranty and manufactured across Taiwan, US, and China facilities using consistent quality standards.