Multiplexer with a channel distributor for digital signals of different hierarchical levels

Muldex with a plurality of line termination units (4) low bit rate and at least one line terminal unit (5) of high bit rate, which are interconnected by a switching network in the form of a bus system (6). Since all the line termination units (4,5) multiplexer (17,66) and demultiplexer (25,65) contain channels of digital signals (DSO, DS1, DS1C, DS2, DS3) of various hierarchical levels can be switched through and redistributed as desired. An interconnection and interaction between various Muldex is possible.