A system balances bandwidth used by a data stream. The logical firewall is part of a logical network that includes a set of logical forwarding elements. At least two of these phase-shifted sample signals are selected as a function of the respective phase angles with respect to the data signal, and in each case are supplied separately to a device for time sampling of the data signal with the selected sample signal. In another embodiment, the forefoot support tubes air arranged in a radiating pattern, such that at least two of the forefoot support tubes diverge as they extend toward the lateral side of the insert. The main controller is used to divide a received main data into a plurality of sub-data, and the sub-data are respectively saved in the memory blocks through corresponding sub-controllers. These processed signals are shared with all the other terminals within the micro-cell.