Patent ID: 8448250
Filing Date: 2013-05-21
Classification: H04K,H04L,Y04S

Abstract:
1. A method performed by a communication system, the method comprising: transmitting confidential and non-confidential data blocks between intake units and output units of a communication system, wherein the communication system comprises an intake unit for confidential data blocks and an intake unit for non-confidential data blocks, an output unit for confidential data blocks and an output unit for non-confidential data blocks, and a data distribution unit for transmitting data, wherein the confidential data blocks from the intake unit for confidential data blocks are transmitted to the output unit for confidential data blocks, and non-confidential data blocks from the intake unit for non-confidential data blocks are transmitted to the output unit for non-confidential data blocks; assigning different markings to the confidential data blocks and the non-confidential data blocks respectively by encoding the confidential and non-confidential data blocks in a direct current-free code, wherein the data distribution unit is adapted to transmit the differently marked confidential and non-confidential data blocks from the confidential and non-confidential intake units to the corresponding confidential and non-confidential output units, respectively; selecting an additional data signal so that a predetermined direct current voltage value is added to the confidential data blocks; applying the additional data signal to the confidential data blocks with the respective intake unit; and transmitting the confidential or non-confidential data blocks with the additional data signal from the confidential or non-confidential intake unit to the corresponding confidential or non-confidential output unit respectively.