A digital system has been implemented on the hot strip mill of CST to record and to collect on-line images of the strip and of the equipments at critical locations. All the data from fixed camera or from “scanning” cameras with extended scopes are displayed through Internet to the HSM operator and maintenance staff. The system is very effective and is a major asset for fault analysis as well as for the on-line strip to strip optimization of the rolling parameters by the operator. The system has allowed deeper investigations at the coil box, at the finishing mill and at the down coilers. Indeed the very intricate nature of fast events that occur at these locations make them difficult to be observed on-line by any operator.