what are the basic types of communication system?

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Communication system can be classified according to the mode of transmission, modulation or transmission channel.

(1) According to mode of transmission - 
(a) Analog Communication - Analog communication is that type of communication in which the message or information signal to be transmitted is Analog in nature. This means that in analog communication the modulating signal (that is, baseband signal) is an Analog signal.
(b) Digital Communication - Digital Communication is that type of communication in which the message or information signal to be transmitted is digital in nature.

(2) According to the type of modulation - There are many types of modulation. Depending upon the modulation techniques used, there are classified as shown in the following figure.

(3) According to transmission channel - 
(a) Line communication
(b) Space communication

(4) According to the nature of information source - 
(a) Speech transmission
(b) Picture transmission
(c) Facsimile transmission (FAX)

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