Abstract: A switching exchange in which data on each incoming line are applied to an encoder which produces redundant code words therefrom. The switching matrix is divided into n sub-switching matrices which each transmit a different sub-code word. The outputs of the sub-switching matrices are connected to a decoder which corrects erroneous data words and in addition indicates the occurrence of a fault. Each sub-switching matrix may have its own setting processor receiving identical setting information from a central switching processor. In the event of failure of a sub-switching matrix the decoder can correctly restore the data words. It therefore is possible to effet repair simply replacing the defective sub-switching matrix without switching-off the exchange.