The JBX06533 400GBASE-CR8 QSFP-DD to QSFP28 Direct Attach Copper Breakout Cable represents the pinnacle of data center connectivity solutions for enterprises demanding high-speed, reliable networking infrastructure. **Product Overview:** This premium 3-meter active breakout DAC cable is specifically designed to serve as a direct replacement for the Arista H-D400-4Q100-3M, offering seamless compatibility with existing network architectures. The cable breaks out a single 400G QSFP-DD connection into four 100G QSFP28 connections, making it indispensable for disaggregated network deployments and multi-tenant data center environments. **Technical Specifications:** Built to IEEE ETC 400GBASE-CR8 and QSFP-DD MSA standards, this cable features premium 30AWG twinax copper conductors that minimize signal degradation while reducing electromagnetic interference. The robust plastic jacketing provides mechanical protection and flame resistance, while the active circuitry ensures signal conditioning across the full 3-meter transmission path. **Key Features & Benefits:** - Active signal conditioning for superior performance stability - 400G to 100G breakout flexibility for multi-speed deployments - 3-meter length accommodates flexible rack configurations - RoHS and ELV compliant for global regulatory requirements - TUV and UL safety certifications ensure reliability - Operating range: 0-70°C supports diverse data center environments - Custom branding options available for white-label solutions **Applications & Use Cases:** Ideal for data center operators transitioning to 400G infrastructure while maintaining investment in existing 100G equipment. Perfect for high-density switch fabrics, top-of-rack aggregation, and spine-leaf architectures. Commonly deployed in cloud service provider environments, financial data centers, and enterprise colocation facilities. **Quality Assurance:** Backed by a 90-day limited warranty, this cable undergoes rigorous testing to ensure specification compliance. Ships from US locations (Danville, CA and Beaufort, SC) with free standard shipping on orders over $99. Manufactured to precise specifications in Vietnam and China using certified production facilities. **Value Proposition:** The JBX06533 delivers enterprise-grade performance at competitive pricing, offering seamless Arista ecosystem integration without costly OEM premiums. Whether building new infrastructure or expanding existing deployments, this cable provides the performance, reliability, and flexibility modern data centers demand.