The JBX02185 is a premium 1000BASE-BX40-U SFP optical transceiver engineered for demanding network applications requiring extended-reach connectivity over single-mode fiber. With support for 40-kilometer transmission distances, this module excels in campus networks, carrier-grade deployments, and long-distance data center interconnections. **Technical Specifications:** This transceiver operates at 1 Gigabit per second over a 9/125 micrometer single-mode fiber core, utilizing 1310nm and 1490nm wavelengths for simultaneous transmission and reception on a single fiber strand. The simplex LC/UPC connector ensures reliable optical connections with minimal signal loss and high return loss performance. Dimensions of 5.0" x 4.0" x 2.0" conform to standard SFP form factors for seamless integration into existing infrastructure. **Performance & Reliability:** Qualified to SFF-8472 extended-reach BiDi specifications, this transceiver surpasses standard IEEE 802.3ah requirements for superior signal integrity over extended distances. The integrated laser transmitter and metal case construction provide protection against environmental interference and mechanical stress. Operating temperature range of 0°C to 70°C accommodates indoor and outdoor deployment scenarios. **Compliance & Certification:** Fully RoHS and ELV compliant, this module meets EU Directive 2002/95/EC for hazardous substance restrictions. Comprehensive safety certifications include Class 1 Laser designation, TUV approval, UL certification, and FDA 21CFR 1040.10 compliance, ensuring safe operation in all environments. **Compatibility & Integration:** As an Arista SFP-1G-BXU40 compatible module, this transceiver provides a cost-effective alternative for existing deployments. Custom brand programming is available for OEM integration and white-label applications. Manufactured in Vietnam and China with rigorous quality control, this module is backed by a 90-day limited warranty. **Applications:** Ideal for telecommunications carriers, service providers, enterprise networks, and data center operators requiring extended-reach optical connectivity. Suitable for point-to-point fiber links, metro area networks, and campus backbone connections. **Shipping & Support:** Enjoy free standard shipping on orders exceeding $99, with dispatch from Danville, CA or Beaufort, SC. Our expert support team assists with technical specifications, compatibility verification, and deployment guidance.