The JBX01120 400GBASE-LR8 QSFP-DD Transceiver represents a cutting-edge solution for organizations deploying next-generation 400 gigabit per second network infrastructure. This optical transceiver module is specifically engineered to meet the demanding requirements of modern data centers, service providers, and enterprise networks requiring ultra-high-speed, long-distance connectivity. **Technical Specifications:** This transceiver operates at a 400GB data rate and is qualified to IEEE 802.3bs and QSFP-DD MSA standards. It achieves transmission distances up to 10 kilometers over standard 9/125 singlemode fiber (SMF), utilizing duplex LC/UPC connectors for secure, low-insertion-loss connections. The QSFP-DD form factor enables maximum port density within standard network switch chassis, delivering exceptional cost-efficiency for large-scale deployments. **Performance & Compatibility:** The module is fully compatible with Arista QDD-400G-LR8 systems and can serve as a direct replacement for OEM part number QDD-400G-LR8. Its LR8 (Long Reach) designation indicates optimized performance for campus and metro area network applications, supporting distances that traditional SR modules cannot achieve. **Quality & Compliance:** Constructed with a durable metal case and precision laser transmitter components, this transceiver meets rigorous international standards including RoHS/ELV directives, Class 1 Laser certification, and comprehensive safety certifications (TUV, UL, FDA 21CFR 1040.10). Manufacturing in Vietnam and China ensures quality consistency across production batches. **Operational Characteristics:** With an operating temperature range of 0°C to 70°C (32°F to 158°F), this module performs reliably in climate-controlled data center environments. Custom brand programming is available for organizations requiring OEM-level customization. **Value Proposition:** Offering free standard shipping on orders exceeding $99 and backed by a 90-day limited warranty, the JBX01120 provides exceptional value for infrastructure upgrades. Ships from strategically located U.S. facilities (Danville, CA and Beaufort, SC) for rapid deployment. Ideal for network architects and IT professionals upgrading to 400G capabilities while maintaining budget discipline and compatibility with existing Arista investments.