Abstract: The invention concerns a method of establishing and/or maintaining a wake mode in an electrical installation, which in addition to at least one receiving device has at least one transmitting device that is connected through an optical bus system. So as not to always have to operate the different devices in the stand-by mode when no data traffic takes place through the optical bus system, the state of the art proposes activating the receiving device only part of the time. If during that time the receiving device receives a corresponding signal from the transmitting device, the stand-by mode is ended in order to establish the data exchange. However this operating mode is also disadvantageous because of the power consumption.

Abstract: Movement data of a mobile station (15) which is associated with a mobile radio network are determined by storing, for a plurality of base stations (23, 24, 25, . . . ) which are associated with the mobile radio network and which successively supply the mobile station (15) as it moves, at least the location information (Z; X, Y) which is associated with the base stations, and deriving the movement data from a sequence of stored location information in order to be able to call from a database traffic-related information by means of the movement data.