# multiplexor / demultiplexor and communications networks (general question)

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## multiplexor / demultiplexor and communications networks (general question)

 Hi! First of all sorry for my English. On the lecture was said that the multiplexor and demultiplexor performs opposite functions and this property can be used in communications networks. I'm not sure if I fully understand this. I think when we put two ones as input to the multiplexor and then try to invert this process using demultiplexor there will be a problem because one of the ones will turn into zero. I will show what I mean in the example (I set selection pins arbitrarily to zeros): I don't understand something important? Or maybe that thing that was said on lecture about performing opposite functions and how communication network works was just some sort of simplification?
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## Re: multiplexor / demultiplexor and communications networks (general question)

 Administrator When you use these for communications, you need a synchronized clock at each end so that you apply first a 0 to both Select inputs to transfer the data on one input to the corresponding output and then a 1 to transfer the data on the other side. So if your data rate on each line is, say, 100 bits per second, the data rate on the single line connecting them would be 200 bits per second with half of it being from one line and half from the other. If you have a 16 input mux and demux, the data rate on the connecting line would be 16 times the data rate on the individual lines.