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 for multiplexing
From The Free On-line Dictionary of Computing (30 December 2018) :

  multiple access
     1.  (Or "multiple access") Combining several
     signals for transmission on some shared medium (e.g. a
     telephone wire).  The signals are combined at the transmitter
     by a multiplexor (a "mux") and split up at the receiver by a
     demultiplexor.  The communications channel may be shared
     between the independent signals in one of several different
     ways: time division multiplexing, frequency division
     multiplexing, or code division multiplexing.
     If the inputs take turns to use the output channel ({time
     division multiplexing) then the output bandwidth need be no
     greater than the maximum bandwidth of any input.
     If many inputs may be active simultaneously then the output
     bandwidth must be at least as great as the total bandwidth of
     all simultaneously active inputs.  In this case the
     multiplexor is also known as a concentrator.
     2.  Writing multiple logical copies of data
     files.  Placing the copies on totally separate paths to
     mirrored devices greatly reduces the probability of all
     copies being corrupt.  Multiplexing differs from mirroring in
     that mirroring takes one data file and copies it to many
     devices, thus making it possible to copy a corrupt file many
     times.  Multiplexing writes the data files to many places
     simultaneously; there is no "original" data file.

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