1.6T Ethernet Packet Loss Problem Solved: PHY-Layer Buffer Exhaustion with MAC-Layer Credit-Based Flow Control

Laboratory benchmarks of 1.6 Terabit Ethernet (1.6T) data streams found that traditional packet-forwarding logic causes instantaneous Physical layer (PHY) memory buffer exhaustion under saturated, wire-speed workloads, according to newly released validation data reported by the IEEE ComSoc Technology Blog. The benchmarks address packet loss in 1.6T Ethernet fabrics being built for next-generation AI clusters, with the reported fix combining PHY-layer buffer exhaustion analysis and MAC-layer credit-based flow control. The finding matters for operators scaling network fabrics to support AI workloads, where wire-speed saturation can trigger buffer exhaustion in conventional forwarding designs.