MULTIPLEXING
All transmission media have capacities great enough to carry more than one voice channel. In other words, their bandwidths are considerably greater than the 3 kHz needed for transmitting the human voice. At the top end of the scale microwave and fibre-optic circuits carry thousands of voice channels; at the lower end of the scale, each voice channel may be split into 12 or 24 telegraph channels.
Where a facility is set up, such as a chain of microwave links, which has a broad bandwidth it is very desirable to make the maximum use of this bandwidth by making it carry as many channels as possible. It is often desirable to construct a communication link with as wide a bandwidth as possible and then divide the bandwidth between as many ...
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