The JBX01126 400GBASE-PLR4 QSFP-DD transceiver represents cutting-edge optical interconnect technology designed for demanding enterprise and data center environments. This high-capacity transceiver operates at 400 gigabits per second, providing the bandwidth necessary for modern cloud infrastructure, high-frequency trading platforms, and media streaming services. **Key Technical Features:** This transceiver supports 10-kilometer reach over standard singlemode fiber (9/125 micron core), making it ideal for campus interconnects and metropolitan area networks. The 1310nm wavelength operation combined with MTP/MPO-12/APC connectors ensures optimal signal integrity and minimal insertion loss. Operating across a wide temperature range (0-70°C), it maintains consistent performance in diverse deployment scenarios. **Compatibility and Integration:** Designed as a direct replacement for Juniper QDD-4X100G-LR modules, the JBX01126 integrates seamlessly into existing Juniper infrastructure without requiring firmware updates or reconfiguration. This compatibility reduces deployment time and minimizes operational disruption. **Standards Compliance:** Fully qualified to IEEE 802.3bs specifications and QSFP-DD MSA standards, this transceiver meets rigorous industry benchmarks. Comprehensive safety certifications including Class 1 Laser compliance, TUV validation, and FDA approval (21CFR 1040.10) ensure safe operation in all environments. **Environmental Responsibility:** RoHS and ELV directive compliance (EU 2002/95/EC) reflects commitment to sustainable manufacturing practices and environmental protection. **Support and Warranty:** Backed by a 90-day limited warranty and available custom brand programming, with free standard shipping on orders exceeding $99. Ships from strategically located U.S. warehouses (Danville, CA and Beaufort, SC) for rapid delivery. Ideal for network architects and IT professionals upgrading to 400G infrastructure while maintaining compatibility with existing Juniper deployments.