The vertical axis represents the value or strength of a signal. The easiest way to show signals is by plotting them on a pair of perpendicular axes. Although each value can be any number, it is often as simple as 0 or 1. Digital Signalĭigital signals can have only a limited number of defined values. When the wave moves from value A to value B, it passes through and it includes an infinite number of values along its path. Analog SignalĪnalog signals have infinitely so many levels of intensity over a period of time. In this way the data can represent, signals can also represent either Analog or digital. Digital Dataĭigital data refers to information which has discrete states.įor Example, a digital clock which reports the hours and minutes that will change suddenly from 10:05 to 10:06. Analog DataĪnalog data refers to information which is continuous.įor Example, an Analog clock which is having hour, minute, and second hands that gives information in a continuous form the movement of the hands are continuous. Transmission media works by conducting energy along a physical path.īoth data and the signals that represent them can be either Analog or digital in form. The data which is used by a person is not in a form that can be transmitted over a network.įor example, a photograph has to be changed to a form that transmission media can accept. The physical layer’s major function is to move data in the form of electromagnetic signals over a transmission medium.

Note c signla