The JBX01091 400GBASE-DR4 QSFP-DD Transceiver represents the pinnacle of high-speed optical networking technology, designed for organizations requiring maximum throughput and reliability in their data center infrastructure. This enterprise-class optical module delivers exceptional performance characteristics that align with the most demanding network requirements. **Technical Specifications and Performance** Operating at 400 gigabits per second, this transceiver utilizes 1310nm wavelength technology optimized for singlemode fiber transmission. The 9/125 micron singlemode fiber core enables signal transmission across distances up to 500 meters, making it ideal for inter-building connectivity and large data center campus networks. The QSFP-DD form factor provides superior density, allowing higher port counts in the same physical space compared to older transceiver standards. **Connectivity and Compatibility** The MTP/MPO-12/APC connector interface is the industry standard for high-density 400G deployments. Direct Juniper QDD-400G-DR4 compatibility ensures plug-and-play installation for customers operating Juniper-based infrastructure. This module is fully qualified to IEEE 802.3bs specifications and QSFP-DD MSA (Multi-Source Agreement) standards, guaranteeing interoperability across compatible equipment. **Safety, Compliance, and Quality** Multiple international certifications underscore this transceiver's quality and safety standards. Class 1 Laser certification (LN #50 7/2001), TUV, UL, and FDA (21CFR 1040.10) approvals demonstrate rigorous testing and compliance with global safety requirements. RoHS and ELV directive compliance aligns with EU environmental regulations, supporting sustainability initiatives. The robust metal case with integrated laser transmitter provides excellent heat dissipation and electromagnetic shielding. **Operational Advantages** With an operating temperature range of 0-70°C (32-158°F), this transceiver maintains performance in varied environmental conditions. The custom brand programming option allows integration with existing network management systems and asset tracking procedures. Free standard shipping on orders exceeding $99 and competitive 90-day limited warranty coverage provide excellent value. Available inventory from multiple U.S. locations (Danville, CA and Beaufort, SC) ensures rapid fulfillment and minimal deployment delays. **Applications and Use Cases** Perfect for data center interconnects, high-performance computing clusters, and large enterprise campus networks requiring 400G connectivity. Ideal for service providers building next-generation network infrastructure and organizations undertaking digital transformation initiatives. The 500-meter SMF reach supports diverse network topologies from confined data center environments to expansive multi-building facilities.