DMX 101: A DMX 512 Handbook
3.1 The Cable TV Analogy
A central concept of DMX 512 is the ability to transmit data on multiple channels over a single cable. To better understand this concept, imagine a simple cable TV system (Figure 1) with four major components:
•Cable TV Company
•Cable
•Decoder
•TV
3
Figure 1
The Cable TV Company broadcasts many channels at once in a mixed signal over a single cable. The Cable carries the signal to a Decoder, usually a cable TV box or similar device. The Decoder is able to separate all the channels from one mixed signal, and send only the desired channel to the TV (channel 001, in this example), ignoring the rest.
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