Hi, I hope this is the right forum. I'm a computer science student and at the moment I'm a little confused with some basic theory regarding signals. I am told that some media (such as fibre optics and other forms of unguided media e.g. microwave) only propagate analogue signals. Yet, guided media such as coaxial and twisted pair can transmit digital. I feel that my course lecturer is attempting to hide some of the detail of this from us to avoid confusion, however, it is only confusing me more. Could someone please explain to me exactly why some media only propagate analogue signals. Thanks.