The JBX02159 is a premium 1000BASE-BX20 SFP optical transceiver designed for enterprise-grade network infrastructure requiring extended-reach single-mode fiber connectivity. This bidirectional (BiDi) transceiver leverages advanced wavelength-division technology to deliver simultaneous transmission and reception over a single fiber strand, providing 20km reach—double the standard 10km distance of typical SFP modules. Key Technical Specifications: Operating at 1310/1490nm wavelengths, this transceiver supports full-duplex gigabit Ethernet (1000 Mbps) transmission. The 9/125 micron single-mode fiber core ensures minimal signal degradation over extended distances, while the Simplex LC/UPC connector provides low-loss, precision optical coupling. The module qualifies to SFF-8472 specifications and extends beyond standard IEEE 802.3ah compliance for superior performance. Robust Construction & Safety: Encased in durable metal housing with integrated laser transmitter technology, this industrial-grade module operates reliably across extreme temperature ranges (-40°C to 85°C). It carries multiple safety certifications including Class 1 Laser designation, UL/FDA compliance per 21CFR 1040.10, and TUV certification, ensuring safe operation in critical network environments. Full RoHS/ELV compliance makes it environmentally responsible for global deployments. Cisco Compatibility & Flexibility: Direct replacement for Cisco GLC-BX-U20-I modules, the JBX02159 integrates seamlessly into existing Cisco infrastructure without requiring firmware updates or configuration changes. Custom brand programming is available for OEM integration. Applications: Ideal for telecommunications providers, data center operators, and enterprise networks requiring cost-effective long-distance connectivity across metropolitan and campus networks. Perfect for disaster recovery links, redundant connections, and extended-reach point-to-point networking. Value Proposition: With free standard shipping on orders over $99 and 90-day limited warranty protection, this transceiver delivers exceptional value. Ships from multiple U.S. locations (Danville, CA and Beaufort, SC) for rapid deployment.