Types of communication channels

If you have ever tried talking to your friend through a pipe by passing on the voice from your mouth straight to your friend's ear, then you have used a physical communication medium. Other than that, there are logical communication mediums as well. The two together, both the physical and logical mediums, make up the communication channel in the telecommunication and computer networks which are commonly used for transmitting information. The communication channel width is measured in Hertz (Hz), while its data rate is measured in bits per second (bps).