The JBX02191 is a premium 1000BASE-BX40-U SFP optical transceiver specifically designed for enterprise-grade network infrastructure requiring extended-reach connectivity. This simplex module leverages advanced bidirectional technology to transmit and receive signals simultaneously over a single singlemode fiber strand, making it ideal for point-to-point network links spanning up to 40 kilometers. **Technical Specifications & Performance:** Operating at 1310/1490nm dual wavelengths, this transceiver delivers 1GB (1000BASE) data rates with consistent reliability. The 9/125 micron singlemode fiber core ensures minimal signal loss and dispersion, critical for long-distance deployments. With an operating temperature range of -40 to 85°C (-40 to 185°F), the module performs reliably in diverse environments from climate-controlled data centers to outdoor industrial installations. **Key Features:** - Simplex LC/UPC fiber connectors for secure, low-loss connections - Metal case construction for superior EMI shielding and durability - Advanced laser transmitter with integrated safety mechanisms - 90-day limited warranty providing peace of mind - Custom brand programming available for OEM integration - Compact SFP form factor (5x4x2mm) for dense port configurations **Compliance & Certifications:** Fully RoHS and ELV compliant, certified as Class 1 laser per FDA 21CFR 1040.10, and validated to UL/TUV standards. Qualified to SFF-8472 extended-reach BiDi specifications, exceeding standard IEEE 802.3ah requirements for enhanced performance. **Compatibility & Applications:** Direct replacement for Extreme Networks 10057H-40K transceivers, ensuring plug-and-play installation. Ideal for enterprise networks, service provider infrastructure, industrial automation systems, and campus connectivity. Perfect for organizations needing reliable long-distance fiber links without costly infrastructure upgrades. **Ordering & Support:** Enjoy free standard shipping on orders over $99, with convenient fulfillment from multiple U.S. locations. Manufactured in Vietnam and China using quality components, this transceiver represents exceptional value for demanding network deployments.