The JBX02139 1000BASE-BX10-U SFP transceiver is a professional-grade optical module designed for telecommunications infrastructure and enterprise networking environments. This module provides cost-effective gigabit Ethernet transmission over extended distances using single-strand singlemode fiber technology. Technical Specifications: The transceiver operates at 1GB data rates with a transmission range of 10 kilometers over standard 9/125 singlemode fiber. It utilizes dual wavelengths (1310nm TX / 1490nm RX) for bidirectional communication on a single fiber strand, eliminating the need for duplex fiber pairs and reducing cabling infrastructure costs. The simplex LC/UPC connector ensures secure, low-loss connections with minimal insertion loss. Build Quality & Safety: Constructed with a durable metal case housing an integrated laser transmitter, this module is built to withstand demanding network environments. It maintains operation across a wide temperature range from -40 to 85°C, making it suitable for both indoor and outdoor deployments. The device holds multiple safety certifications including Class 1 laser designation, FDA 21CFR 1040.10 compliance, UL certification, and TUV approval. Compliance & Standards: Fully compliant with IEEE 802.3ah specifications and SFF-8472 standards, the JBX02139 ensures interoperability with standard SFP slot equipment. RoHS and EU directive 2002/95/EC certification confirms environmental responsibility and reduced hazardous substance usage. Compatibility & Applications: This module is engineered as a direct replacement for Fortinet FN-TRAN-SFP-1BU10 transceivers, offering seamless integration into existing Fortinet network security appliances and similar SFP-based systems. Ideal applications include data center backbone connections, metropolitan area networks (MANs), carrier-grade networks, and enterprise wide-area network (WAN) links requiring reliable long-distance optical transmission. Customization Options: Custom brand programming is available for organizations requiring proprietary labeling or firmware configurations. Free standard shipping applies to orders exceeding $99, with fast dispatch from distribution centers in Danville, CA and Beaufort, SC. Warranty & Support: Backed by a 90-day limited warranty, this optical transceiver represents a reliable, cost-effective solution for expanding network capacity over long distances while maintaining gigabit-class performance.