<P> Data transmission ( also data communication or digital communications ) is the transfer of data ( a digital bitstream or a digitized analog signal ) over a point - to - point or point - to - multipoint communication channel . Examples of such channels are copper wires , optical fibers , wireless communication channels , storage media and computer buses . The data are represented as an electromagnetic signal , such as an electrical voltage , radiowave , microwave , or infrared signal . </P>
<P> Data transmission ( also data communication or digital communications ) is the transfer of data ( a digital bitstream or a digitized analog signal ) over a point - to - point or point - to - multipoint communication channel . Examples of such channels are copper wires , optical fibers , wireless communication channels , storage media and computer buses . The data are represented as an electromagnetic signal , such as an electrical voltage , radiowave , microwave , or infrared signal . </P>
group of wires that transfer data are known as
group of wires that transfer data are known as
communication channel
communication channel