The JBX02156 is an enterprise-class 1000BASE-BX20 SFP transceiver module engineered for demanding network infrastructure requiring extended transmission distances without compromising performance. Operating at gigabit speeds with a maximum reach of 20 kilometers over standard singlemode fiber, this module represents an ideal solution for network administrators seeking reliable, cost-effective connectivity across distributed locations. **Technical Specifications:** This optical transceiver operates on the 1000BASE-BX standard, utilizing wavelength division multiplexing at 1310nm and 1490nm to achieve bidirectional communication over a single fiber strand. The module conforms to SFF-8472 specifications and exceeds IEEE 802.3ah extended-reach requirements, ensuring compatibility with modern networking equipment. **Compatibility & Integration:** The JBX02156 is fully compatible with Arista equipment and directly replaces the SFP-1G-BXU20 OEM part number. The simplex LC/UPC connector provides secure, low-loss connections with industry-standard polishing for consistent performance. Custom brand programming is available for organizations requiring OEM-specific configurations. **Build Quality & Safety:** Constructed with a durable metal case housing advanced laser transmitter technology, this module delivers long-term reliability in diverse deployment environments. Full RoHS/ELV compliance ensures environmental responsibility, while comprehensive laser safety certifications (Class 1 Laser, TÜV, UL/FDA 21CFR 1040.10) guarantee safe operation in any facility. **Performance Characteristics:** With an operating temperature range of 0-70°C (32-158°F), the module maintains consistent performance across seasonal variations and equipment room conditions. The 9/125 micron singlemode fiber core minimizes chromatic dispersion, enabling reliable transmission at 20km distances without signal degradation. **Applications:** • Metro area network (MAN) connectivity • Data center campus interconnection • Service provider long-distance links • Disaster recovery site connections • Financial institution secure networks • Healthcare facility network expansion **Value Proposition:** Ships from strategic U.S. locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. The 90-day limited warranty provides peace of mind for critical infrastructure investments.