A communications link can carry many separate digital messages by multiplexing. The message bits are split up into small packets, and packets from different messages are interleaved, sent and the messages are then reassembled on arrival. Several multiplexed signals can be sent at different frequencies over a link to increase its capacity even more.
|FIBER-OPTIC MULTIPLEXED SIGNALS
The glass core of this cable carries four light signals at different frequencies shown as different colors. Each signal is multiplexed and consists of interleaved eight-bit packets from three messages, so that the cable carries 12 messages; nine (A to I) are sown. Multiplexing enables a single link to carry thousands of messages at once.