i) Input signal: - The information can be in the form of sound, picture or data coming from computer.
ii) Input transducer: - it converts original information into equivalent electrical signal.
iii) Transmitter: - it converts electric equivalent into suitable form. It increases the power level of signal so that it can cover long distance.
iv) Communication Channel: - it is the medium used for transmission of electromagnetic e.g. from one place to another..it can be wire or optical fibre or free space.
v) Noise: - It is unwanted signal which gets added in transmitting signal.
vi) Receiver: - the received signal is demodulated & converted back to suitable form.
vii) Output transducer: - It converts electrical signal into original form.