1.1 Scope and objective of the full standard IEC 62488-X IEC 62488-X is a family of standards dealing with all aspects of power line communication systems operating over electricity power lines. Currently this document is organized as follows: " IEC 62488-1/IS Planning of analogue and digital power line carrier systems operating over EHV/HV/MV electricity grids " IEC 62488-2 Analogue Power Line Carrier terminals or APLC " IEC 62488-3 Digital Power Line Carrier terminals or DPLC " IEC 62488-4 Broadband Power Line systems or BPL These international standards apply to power line carrier terminals and systems (PLC) used to transmit information over power networks including extra high, high and medium voltage (EHV/HV/MV) power lines. Both analogue and digital modulation as well as narrow and broadband systems will be included. 1.2 Scope and objective of IEC 62488-2 This International Standard applies to Amplitude Modulation Single Sideband (AM-SSB) Analogue Power Line Carrier (APLC) Terminals and Systems used to transmit information over power lines (EHV/HV/MV). In many countries, Power Line Carrier (PLC) channels represent a main part of the utility owned telecommunication system. A circuit which would normally be routed via a PLC channel may also be routed via a channel using a different transmission medium, such as a point to point radio or open-wire circuit. Since, in many cases, automatic switching is used, the actual rerouting, although predetermined, is unpredictable. It is important, therefore, that the input and output signals and criteria exchanged among all terminal used in the communications system are compatible. This compatibility is also beneficial in creating the ability to interchange and interconnect terminals from different sources. In particular this part of IEC 62488 covers basically baseband signals with bandwidths of 4 kHz and 2,5 kHz, or multiples thereof, corresponding to the same high frequency bandwidth/s for single or multi-channel APLC terminals. This part of the standard has been prepared to enable compatibility between APLC links from different sources or between APLC links and other transmission medium to be achieved and to define the terminal performance required in APLC networks. Therefore the object of this standard is to identify the main components, functionalities and establish recommended values for characteristic input and output quantities of an APLC terminal and the definitions and all other essential information for an understanding of these recommendations. All the tests verifying the requirements shall be considered as type tests as defined in the International Electrotechnical Vocabulary (IEV 151-04-15). The following Figure 1 shows a schematic representation of the scope of the IEC 62488-2 standard within a complete power line communication system installation