System for failsafe and redundant transmission of complex data, in particular control data, audio and/or video data, between a stationary, central control unit and a component for safety control in a movable transport unit via a wireless communication system, which has a plurality of access points (ZP1, ZP2, ZP3), with the following features: - access points (ZP1, ZP2, ZP3) to the wireless communication system are provided along a motion path of the movable transport unit, - at least two transmission modules (A1, A2) are attached to the movable transport unit for communication with the access points (ZP1, ZP2, ZP3), on which transmission modules the so-called Layer 2 Tunnel Protocol is implemented, by which a virtual private network is created, - a transmission of the complex data between the central control unit and the at least two transmission modules (A1, A2) is carried out in parallel via at least two separate transmission channels (UK1, UK2) of the wireless communication system, - wherein in each case one of the at least two separate transmission channels (UK1, UK2) is assigned to one of the at least two transmission modules (A1, A2), - a coupling of the at least two transmission modules (A1, A2) to the components for safety control of the movable transport unit is carried out via a coupling module (K1, K2) in each case and - the at least two transmission modules (A1, A2) are attached to the transport unit spatially separated from one another with different alignment and corresponding transmitting/receiving characteristics and antenna characteristics (AC1, AC2) in such a way that there is no point in time at which both transmission modules (A1, A2) change the access point (ZP1, ZP2) for forming the respective transmission channel (UK1, UK2) at the same time. - access points (ZP1, ZP2, ZP3) to the wireless communication system are provided along a motion path of the movable transport unit, - at least two transmission modules (A1, A2) are attached to the movable transport unit for communication with the access points (ZP1, ZP2, ZP3), on which transmission modules the so-called Layer 2 Tunnel Protocol is implemented, by which a virtual private network is created, - a transmission of the complex data between the central control unit and the at least two transmission modules (A1, A2) is carried out in parallel via at least two separate transmission channels (UK1, UK2) of the wireless communication system, - wherein in each case one of the at least two separate transmission channels (UK1, UK2) is assigned to one of the at least two transmission modules (A1, A2), - a coupling of the at least two transmission modules (A1, A2) to the components for safety control of the movable transport unit is carried out via a coupling module (K1, K2) in each case and - the at least two transmission modules (A1, A2) are attached to the transport unit spatially separated from one another with different alignment and corresponding transmitting/receiving characteristics and antenna characteristics (AC1, AC2) in such a way that there is no point in time at which both transmission modules (A1, A2) change the access point (ZP1, ZP2) for forming the respective transmission channel (UK1, UK2) at the same time.