The backplane is the "backplane wiring" of an electronic device that has several slots for plug-in modules (plug-in cards). The backplane electrically connects the connectors for the plug-in modules. Often it is a passive module, i.e. it does not contain any active components (such as ICs), but it can also contain passive and active components that are used, for example, for slot coding, signal adaptation/termination, or special additional functions such as temperature sensors or similar.