A process for reducing required data throughput when transmitting object or process oriented data between user areas communicating within time conditions, uses a data transmission device having at least one communication module to which at least one external unit is assigned. A sending communication module extrapolates the data to be sent and sends the data to a receiving communication module when a comparison value formed of the respective current data and the extrapolated data at least reaches a desired quantity. The receiving communication module extrapolates received data and provides it for use by an external unit until current data are received.