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CSMA\CD means that when a Clint want to send a signal if is it free it will send the signal and it happens in other Clint at the same time so the signal will crash and then they will try again later after period of time.
The only way is to digitize the audio signal and send it as data
A: Signal travel in a line of sight on mountains there are repeater to by pass the mountain to the next town, A regenerative repeaters will restore this signal before it send it out again
While processing a signal through a channel, it is preferred to sample it. It is because of the following reasonsAs we send only the samples, the gap between samples can be used to send another signal.Multiplexing is possibleSamples occupy less space than signalsTotal signal may not be required to recover dataAnd hence we use samples which are nothing but discrete time signals. hence, it is called discrete time signal processing.
To send multiple messages by changing the carrier signal. To be able to use smaller antennas higher frequency means smaller antenna