Data adapter or communication devices for the telecommunication of useful data, particularly of packet data and/or voice data

To improve the operating convenience-e.g. versatile, universal application and use-and location-independence (mobility) of the telecommunication of useful data, particularly packet data and/or voice data, using communication devices, a data adapter (DA DA) is allocated both a fixed-part-specific air interface architecture (DÜM, STM, PKM) for implementing the prescribed air interface protocol, and the air interface architectures associated with the data adapter (DA DA) are activated according to the application instance, i.e., which scenario is to be produced for the telecommunication of useful data and, in particular, which communication device (KE KE) is connected to the data adapter (DA DA).