The Spirent A1 400G 16-Port Appliance enables high-scale performance validation of AI data center networks by emulating realistic AI workloads with full support for RoCEv2 and CCL protocols. With 16 QSFP-DD ports supporting up to 400G per port and a mix of PAM4 and NRZ encodings, it allows precise benchmarking of latency, throughput, and resiliency across AI-driven infrastructures. Advanced features like Auto Negotiation, Link Training, and real-time analytics ensure accurate emulation of AI traffic and stress testing of multi-terabit Ethernet fabrics.