Selecting a transport address for a call session between a first endpoint of a first region and a second endpoint of a second region includes determining that the call session is being initiated. A receive FIFO and a transmit FIFO within the interface apparatus operates to store small-size packets, or operates to store the buffer address of large-size packets, as the small and large size packets are respectively received from the host or transmitted to the host. An adaption unit determines, for the current breathing cycle an extreme value of the periodically generated error signal and varies the value of the integral gain used in the integral gain stage for a next breathing cycle dependent on a rate of change of the value of the extreme error signal with value of the integral gain. In particular, the brake can stop the rotational movement of the internally toothed rim, the sun gear can be driven rotatably by the drive motor, and the shaft of the planet carrier can form the output. The controller includes a voltage detecting circuit that detects the capacitor voltage of a capacitor connected to the output sides of the positive-side contactor and the negative-side contactor, and a determination circuit that compares the detected voltage with a predetermined voltage and determines the connected state of the load. Any computers displaying this model will be notified of the change and will reload and redisplay the updated model object.