The scope of application of the specifications of the sections of part 4 is the communication through the so-called distribution line carrier technology (DLC) on both low and medium voltage distribution network. The application range based on telecommunication processes is wide and cannot be described exhaustively in this section; application examples are: control and monitoring of the distribution network, broadcasting of orders, control of user interfaces, public lighting, traffic lights supervision, automatic meter reading, etc. Extensions to other communication media are also allowed. The distribution line message specification (DLMS) is an application layer specification designed to support messaging communications to and from distribution devices in a computer integrated environment. This environment is referred in this specification as the distribution environment. This specification does not specify a complete set of services for remote programming of devices