Analog Signal

Analog Signals are defined as the type of current used to represent data transmitted over the network. An Analog signal is called a SINE wave. It's state changes constantly, rising above zero and then below zero the same amount. An Analog signal can be measured in three different ways: Amplitude - Strength Phase - The time between the start of one signal and the next. - Measured in degrees. Frequency - The time it takes to complete a cycle - measured in Hertz (Hz - cycles/second).

Digital Signal

Digital Signals are defined as a type of current used to represent data transmitted over the network. A Digital signal is called a SQUARE wave. It's state changes abruptly, rising above zero and then back to zero theoretically over no time. The following can be said about Digital signals: Current State - BIPHASE, BIPOLAR, UNIPOLAR, & RETURN TO ZERO. State of Transition - (Trailing Edge Triggered) Embedded Clock Signal. Asyncronous - Start, Stop, Parity Bit Syncronous - Uses Sync field.