The JBX18111 ST/UPC Simplex Fiber Coupler in Keystone format is an essential component for professional fiber optic networks. Designed with precision engineering, this optical coupler provides reliable interconnection of fiber cables while maintaining superior signal quality across multimode and singlemode applications. **Product Overview:** This fiber coupler features ST/UPC connectors, the industry standard for fiber optic connections. The simplex configuration allows single-fiber transmission, making it suitable for unidirectional communication applications. The compact Keystone form factor enables integration into standard patch panels, wall-mount systems, and network cabinets without requiring additional space. **Technical Specifications:** • Connector Type: ST/UPC • Fiber Type: Multimode & Singlemode compatible • Configuration: Simplex (1 fiber) • Form Factor: Keystone • Material: Durable plastic construction • Dimensions: 1.0" W x 1.0" H x 0.5" D • Weight: Minimal for easy installation • Warranty: 90-day limited warranty • Compliance: RoHS directive 2002/95/EC **Key Features & Benefits:** • Universal Compatibility: Works with both multimode and singlemode fiber types • Secure Connection: ST/UPC design ensures low insertion loss and return loss • Professional Grade: Manufactured to strict optical standards • Easy Installation: Keystone format fits standard patch panels • Reliable Performance: Minimizes signal degradation • Cost-Effective: Economical solution for fiber network expansion **Applications:** Ideal for data centers, enterprise networks, telecommunications infrastructure, security systems, and industrial automation. Use this coupler to extend fiber runs, connect equipment, or reorganize network configurations without replacing entire cable assemblies. **Shipping & Support:** Enjoy free standard shipping on orders over $99. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) for fast delivery. Backed by a 90-day limited warranty for peace of mind. **Why Choose This Coupler:** Manufactured to exacting standards with quality plastics and precision engineering, the JBX18111 delivers consistent performance in demanding network environments. The Keystone design maximizes space efficiency while the ST/UPC connector ensures compatibility with existing infrastructure. Whether you're upgrading networks or maintaining equipment, this simplex fiber coupler provides the reliability professionals trust.