The invention relates to a system for controlling a data transmission to and/or from a plurality of medical devices, said plurality of medical devices being divided into individual groups, each of which comprises at least one medical device. Each group of medical devices on a first data transmission level is directly connected via a respective first network to a communication device for transmitting, storing, and controlling data, said communication device being on a second transmission level, and a plurality of said communication devices exchange data with a common central server device for storing, controlling, and data transmission, said server device being on a third data transmission level.