Patent ID: 7995542

Claim:
A first data adapter for communication devices for telecommunication of useful data, said first data adapter comprising: a data interface supporting a link to the communication devices; a data transmission part for wireless transmissions and reception of the useful data based on a prescribed air interface protocol; and a controller connected to both the data interface and the data transmission part and to which program modules are allocated, the controller and program modules operating to effect two-way transmission of the useful data, wherein the data interface is used based on an appropriate interface protocol and the data transmission part is used based on the prescribed air interface protocol, the controller including first protocol modules for transmission in a downlink direction and for reception in an uplink direction, by which the first data adapter is operated in a first control state in a fixed part-mode, and including second protocol modules for reception in the downlink direction and for transmission in the uplink direction, by which the first data adapter is operated in a second control state in a portable part-mode, the controller activating one of the first protocol modules and the second protocol modules based what type of communication device is allocated to the first data adapter and the manner of telecommunication of the associated useful data; whereby when the first data adapter is operated in the fixed part-mode, at least a second data adapter operated in the portable part-mode can be connected to the first data adapter.