The JBX01088 400GBASE-VR4 QSFP-DD Transceiver represents a cutting-edge solution for modern data center infrastructure and enterprise networking environments demanding ultra-high-speed connectivity. This optical transceiver module delivers exceptional 400GB data rates over multimode fiber, specifically engineered to support 50-meter transmission distances using OM4 MMF cabling—ideal for intra-datacenter connectivity and campus network deployments. **Key Technical Specifications:** Operating at 850nm wavelength, this transceiver utilizes proven multimode technology for cost-effective, high-speed interconnections. The QSFP-DD form factor enables maximum port density in network switches and routers, while MTP/MPO-12/APC connectors provide industry-standard polarity and alignment for reliable, low-loss connections. The module maintains peak performance across the 0-70°C operating temperature range, ensuring consistent operation in diverse deployment scenarios. **Compatibility and Integration:** Designed specifically for Juniper networking platforms, the JBX01088 serves as a direct replacement for the Juniper QDD-400G-VR4 transceiver. This compatibility ensures seamless integration into existing infrastructure without requiring firmware updates or configuration modifications. The transceiver qualifies to IEEE 802.3bs specifications and adheres to QSFP-DD Multi-Source Agreement (MSA) standards, guaranteeing interoperability across qualified networking equipment. **Quality Assurance and Compliance:** Manufactured with premium-grade components featuring a robust metal case and advanced laser transmission technology, this transceiver delivers industry-leading reliability. Complete RoHS and ELV compliance ensures environmental responsibility, while comprehensive safety certifications—including Class 1 Laser designation and FDA compliance under 21CFR 1040.10—guarantee user safety and regulatory adherence. TUV and UL certifications further validate product quality and performance standards. **Value Proposition:** With free standard shipping on orders exceeding $99 and a 90-day limited warranty, this transceiver offers exceptional value for network infrastructure upgrades. Custom brand programming capabilities allow for streamlined integration into specific organizational branding requirements. Whether upgrading existing 400GB networks or deploying new high-speed infrastructure, the JBX01088 provides reliable, standards-compliant performance backed by proven Juniper compatibility.