The JBX01066 400GBASE-FR4 QSFP-DD Transceiver represents a cost-effective solution for organizations requiring ultra-high-speed optical connectivity. With 800GB throughput capability, this transceiver excels in modern data center environments where bandwidth demands continue to escalate. **Key Technical Specifications:** This optical transceiver utilizes 9/125 singlemode fiber core technology, enabling transmission distances up to 2 kilometers without signal degradation. The QSFP-DD (Quad Small Form Factor Pluggable Double Density) form factor delivers maximum density in network switch deployments while maintaining superior cooling efficiency. Duplex LC/UPC connectors provide industry-standard connectivity with reliable, low-loss coupling performance. **Performance & Reliability:** The JBX01066 operates flawlessly within the 0-70°C temperature range, accommodating diverse data center climates. Its metal case construction with integrated laser transmitter ensures long-term reliability and minimal signal loss. Built to transmit low-voltage network signals with precision, this module maintains signal integrity over extended distances. **Compliance & Safety:** Fully compliant with RoHS/ELV directives and EU Directive 2002/95/EC, this transceiver meets global environmental standards. Class 1 laser certification, TUV, UL/FDA approvals, and 21CFR 1040.10 compliance demonstrate adherence to rigorous safety protocols. The modular design supports custom brand programming for OEM integration. **Compatibility & Applications:** Semantically compatible with Juniper network equipment, particularly the QDD-2X400G-FR4-P module, enabling seamless infrastructure upgrades. Ideal for campus networks, metropolitan area networks (MANs), and data center interconnection scenarios requiring extended-range connectivity. **Value Proposition:** Offering superior performance at competitive pricing with free standard shipping on orders exceeding $99, the JBX01066 reduces total cost of ownership while maintaining enterprise-grade quality. The 90-day limited warranty provides peace of mind for mission-critical deployments.