Embedded optical modules (EOMs) have supported supercomputers, core routers, and other applications since 2000; active optical cables (AOCs) arrived seven years later to offer a low-cost alternative to pluggable modules, particularly in high-performance computing (HPC) clusters. Despite being newer to the scene, AOC sales should prove more consistently strong over the next five years than those of EOMs, according to a new forecast from LightCounting.