The JBX01086 is a premium 400GBASE-VR4 QSFP-DD transceiver module designed for mission-critical network infrastructure requiring exceptional data throughput and reliability. Delivering 400GB per second data rates, this module is specifically engineered for multimode fiber (MMF) environments, supporting transmission distances of up to 50 meters over OM4 cabling. Key Technical Specifications: This transceiver operates at 850nm wavelength using MTP/MPO-12/APC connectors, the industry standard for high-density 400GB deployments. It adheres to IEEE 802.3bs, QSFP-DD MSA, and CMIS standards, ensuring compatibility across diverse networking equipment. The module features a robust metal case housing an integrated laser transmitter, built to withstand demanding data center environments. Performance & Reliability: Operating across a wide temperature range (0-70°C / 32-158°F), this transceiver maintains consistent performance in both hot and cool deployment scenarios. The Class 1 laser designation ensures optimal safety, while TUV, UL, and FDA certifications (21CFR 1040.10) validate compliance with international safety standards. Compatibility & Integration: Purpose-built as an Arista QDD-400G-VSR4 compatible replacement (OEM P/N: QDD-400G-VSR4), this module integrates seamlessly into existing Arista infrastructure. Custom brand programming is available for organizations requiring OEM labeling. Compliance & Sustainability: Full RoHS (EU directive 2002/95/EC) and ELV compliance ensures environmental responsibility without compromising performance. The commodity classification (8544.70.0000) reflects its status as a critical optical transmission component. Deployment Advantages: Ideal for data center expansions, cloud service providers, and enterprise networks requiring 400GB connectivity over multimode fiber. The 50-meter MMF capability reduces infrastructure costs compared to single-mode alternatives while maintaining superior performance. Backed by a 90-day limited warranty and supported by free standard shipping on orders exceeding $99, this module represents exceptional value for organizations modernizing their network infrastructure.