The JBX01089 400GBASE-DR4 QSFP-DD transceiver module is engineered to meet the demanding requirements of modern data center and enterprise network environments. This high-performance optical transceiver delivers sustained 400Gbps throughput over single-mode fiber infrastructure, supporting extended 500-meter transmission distances at 1310nm wavelength. **Technical Specifications & Performance:** Built to IEEE 802.3bs and QSFP-DD MSA standards, this transceiver ensures compatibility across compatible switches and network infrastructure. The 9/125 single-mode fiber core supports long-distance, low-latency transmission ideal for data center interconnects, campus networks, and high-speed backbone applications. Operating temperatures from 0-70°C accommodate diverse deployment environments. **Connectivity & Interface:** The MTP/MPO-12/APC connector configuration provides industry-standard, polished connections that minimize signal loss and reflection. This standard connector type simplifies installation and reduces maintenance costs across large network deployments. **Compliance & Safety:** Comprehensive safety certifications include Class 1 Laser designation, TUV, UL, and FDA 21CFR 1040.10 compliance, ensuring safe operation in controlled environments. RoHS and ELV directive compliance (EU 2002/95/EC) demonstrates commitment to environmental standards and sustainable manufacturing practices. **Compatibility & Integration:** As a direct replacement for Arista QDD-400G-DR4 modules, this transceiver integrates seamlessly into existing Arista network deployments. Custom brand programming options enable OEM integration and private-label deployments. **Reliability & Warranty:** The durable metal case with integrated laser transmitter withstands demanding data center environments. A 90-day limited warranty provides peace of mind for initial deployment phases. Ships from multiple US locations (Danville, CA and Beaufort, SC) with free standard shipping on orders exceeding $99. **Ideal Applications:** Perfect for organizations requiring 400G connectivity over extended fiber spans, including data center migration projects, campus network upgrades, and high-speed interconnect infrastructure modernization. Whether replacing legacy modules or expanding network capacity, this QSFP-DD transceiver delivers enterprise-grade performance and reliability.