The JBX01067 400GBASE-LR4 QSFP-DD transceiver represents cutting-edge optical networking technology designed for organizations requiring ultra-high-speed data transmission over extended distances. This premium module delivers 800 gigabits per second throughput, making it essential for next-generation data center architectures, high-frequency trading environments, and large-scale cloud infrastructure. **Technical Specifications:** Operating at 400GBASE-LR4 standards, this transceiver provides 10-kilometer reach over singlemode fiber with a 9/125 micron core. The duplex LC/UPC connectors ensure optimal signal transmission with minimal signal loss and reflection. The compact QSFP-DD form factor accommodates multiple transceivers in dense network environments while maintaining superior performance characteristics. **Compatibility & Integration:** Designed as a direct replacement for Arista QDD-800G-2LR4 modules, this transceiver integrates seamlessly into existing Arista-based network infrastructure. Custom brand programming is available for OEM deployments, allowing seamless integration with vendor-specific management systems and firmware requirements. **Safety & Compliance:** Comprehensively certified for safety and environmental compliance, this transceiver meets Class 1 laser standards, TUV certification, UL/FDA requirements (21CFR 1040.10), and EU RoHS directive 2002/95/EC. The metal case construction with integrated laser transmitter provides electromagnetic shielding and thermal management. **Reliability & Support:** Operates reliably across the 0-70°C temperature range, accommodating diverse deployment environments. Includes 90-day limited warranty coverage and benefits from free standard shipping on orders exceeding $99. Ships from strategically located distribution centers in California and South Carolina for rapid delivery. **Applications:** Ideally suited for data center upgrades, enterprise campus networks, service provider metropolitan networks, and high-performance computing clusters where ultra-low latency and maximum throughput are critical requirements.