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Full Duplex vs Half Duplex vs Simplex(?) vs Multiplex(?) - Coggle Diagram

- - - - A communication channel refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications and computer networking. A channel is used to convey an information signal, for example a digital bit stream, from one or several senders (or transmitters) to one or several receivers. A channel has a certain capacity for transmitting information, often measured by its bandwidth in Hz or its data rate in bits per second.
        
        If I have two wires, one of them being a clock, which switches between high and low voltage at a constant rate, and the other being a data line, where a high voltage stands for a 1 and a low voltage stands for a 0. Could I say every other bit is a channel, and pretend as if all the even bits are channel one, and all the odd bits are channel two?
- - - - how wide are FM radio channels then?
        
        0.2 MHz-wide
        
        FM broadcasting stations operate on a 20.2 MHz-wide frequency band, spanning from 87.8 MHz to 108 MHz. This is divided into 101 0.2 MHz-wide channels
        
        Stations that broadcast on 87.7 MHz are in actuality licensed as television stations.
        
        what frequency range does TV use, what does it multiplex (it has to right?) what multiplexing technologies does it use?
      - What frequency does AM radio use, how wide are it's channels