The JBX01110 400GBASE-XDR4 QSFP-DD transceiver is a cutting-edge optical interconnect solution engineered for next-generation data center and high-speed networking infrastructure. This module represents a direct replacement for Arista's QDD-400G-XDR4, offering seamless integration into existing network architectures while providing exceptional performance and reliability. Technical Specifications and Performance: This transceiver operates at 400 gigabits per second using the XDR4 protocol, transmitting at 1310nm wavelength over single-mode fiber (9/125 core specification). With a maximum transmission distance of 2 kilometers, it perfectly bridges the gap between short-reach data center interconnects and longer-distance campus backbone applications. The MTP/MPO-12/APC connector configuration ensures high-density port density while maintaining signal integrity across multiple fiber channels. Compliance and Certification: The JBX01110 meets rigorous international standards including IEEE 802.3bs specifications and QSFP-DD MSA compliance. It carries RoHS/ELV directive certification (EU 2002/95/EC), TUV validation, UL/FDA approval, and Class 1 laser certification, ensuring safe operation in professional environments. Manufacturing quality is verified through facilities in Vietnam and China, with final distribution from strategically located U.S. warehouses in California and South Carolina. Design and Durability: The robust metal case construction with integrated laser transmitter technology provides exceptional durability and electromagnetic interference shielding. Compact dimensions (5.0" x 4.0" x 2.0") enable efficient rack-mount deployment in high-density networking cabinets. Applications and Use Cases: Ideal for enterprise data centers, cloud service providers, telecommunications infrastructure, and large-scale LAN/WAN deployments requiring 400GB connectivity. The 2km reach over single-mode fiber makes it particularly suitable for inter-building connectivity and metropolitan-area network configurations. Value and Support: With custom brand programming available, procurement flexibility, and a 90-day limited warranty, this solution minimizes deployment complexity and risk. Free standard shipping on qualifying orders provides additional cost benefits for bulk deployments.