The JBX43547 ST/APC to FC/UPC 5m Simplex Singlemode Fiber Patch Cable represents professional-grade optical connectivity designed for mission-critical telecommunications infrastructure. This cable bridges ST/APC (Straight Tip with Angled Physical Contact) and FC/UPC (Fixed Connector with Ultra Physical Contact) connectors, enabling seamless integration across diverse network architectures. **Technical Specifications:** Built with 9/125 singlemode fiber core conforming to G.657.A1 standards, this cable delivers exceptional performance characteristics. The insertion loss specification of ≤0.35dB (typical 0.15dB) ensures minimal signal degradation, while return loss of ≥20dB maintains signal integrity. Attenuation measurements at standard wavelengths (1310 nm and 1550 nm) meet or exceed industry benchmarks, making this cable suitable for long-distance telecommunications applications. **Construction & Safety:** The cable features a robust 1.8mm outer diameter with OFNR (Optical Fiber, Non-conductive, Riser-rated) jacketing, providing compliance with building safety codes for plenum installations. The yellow-colored jacket aids in cable identification and management within complex installations. RoHS and ELV compliant materials ensure environmental responsibility without compromising performance. **Connectivity & Compatibility:** The simplex configuration dedicates a single fiber strand to unidirectional signal transmission, ideal for applications requiring dedicated transmit or receive paths. The ST/APC connector features an angled contact surface that minimizes back-reflection, while the FC/UPC connector offers robust mechanical stability and secure connection locking mechanisms. **Applications & Use Cases:** Suitable for telecommunications networks, data center interconnects, enterprise networking, CATV systems, and specialized fiber-to-the-premises (FTTP) installations. The 5-meter length accommodates medium-distance connections between network equipment, junction points, and distribution panels. **Compliance & Warranty:** TAA (Trade Agreements Act) compliant for federal procurement requirements. Manufactured to stringent ANSI/TIA/EIA-455-171-A-2001 standards. Includes 90-day limited warranty. Custom lengths available for non-standard requirements. Ships from multiple US distribution centers with free standard shipping on orders exceeding $99.