The JBX02145 1000BASE-BX120 SFP transceiver represents a premium solution for organizations requiring extended-reach optical connectivity in their network infrastructure. Engineered specifically for 120km transmission distances over singlemode fiber, this module delivers exceptional performance while maintaining compatibility with existing Arista-based systems. **Technical Specifications & Performance:** Operating at 1490/1550nm bidirectional wavelengths, this SFP transceiver supports full 1Gbps data rates compliant with 1000BASE-BX standards. The 9/125 singlemode fiber core ensures signal integrity over extended distances, while the simplex LC/UPC connector provides reliable, low-loss connectivity. Qualified to SFF-8472 specifications and supporting extended-reach BiDi beyond IEEE 802.3ah standards, this transceiver meets stringent industry requirements for performance and interoperability. **Build Quality & Durability:** Constructed with a precision metal case and integrated laser transmitter, the JBX02145 withstands harsh environments and heavy-use scenarios. Safety certifications including Class 1 Laser designation, TÜV, UL/FDA compliance, and adherence to EU RoHS directives (2002/95/EC) ensure maximum reliability and safety. Operating temperature range of 0-70°C accommodates diverse deployment environments from data centers to outdoor installations. **Compatibility & Integration:** Designed as a direct replacement for Arista SFP-1G-BXU120 modules, this transceiver integrates seamlessly into existing network architectures. Custom brand programming is available for OEM applications, providing flexibility for resellers and system integrators. **Value & Support:** Backed by a 90-day limited warranty and shipped from conveniently located facilities in Danville, CA and Beaufort, SC, qualified orders receive free standard shipping on purchases exceeding $99. This cost-effective solution maintains exceptional quality while reducing total cost of ownership for network expansions and upgrades. **Applications:** Ideal for metro and regional network interconnects, disaster recovery links, campus networking, and carrier-grade deployments where 120km range and 1Gbps throughput requirements must coexist with budget constraints.