The data multiplexer system includes a spatial division multiplexer (SDM) having a plurality of spatially divided (SDM) input channels, each of which is suitable for transmitting a first number of time-divided TDM channels at a first clock rate, and at least one digital data source. An apparatus for generating a second clock rate derived from a first clock rate, which is the clock rate of the data source, an apparatus for selecting data from one source in synchronization with the second clock rate, and at least one SDM for the selected data. It is composed of a device applying to a channel, and data from a digital data source having a clock rate equal to or different from that of the TDM channel may be applied or transmitted by a predetermined SDM channel.
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