<communications> A device that combines the data streams from
many simultaneously active inputs into one shared channel in
such a way that the streams can be separated after
transmission. The concentrator's output bandwidth must be at
least as great as the total bandwidth of all simultaneously
active inputs. A concentrator is one kind of multiplexing
device.
For example, a concentrator may be used to connect 24 2400 bps
TTYs to a host via a 57600 bps channel.
