Communication
Faithful transmission of information from one place to another place is called communication . Optical fibres are used in optical communication .
Communication System
A communication system contains three main parts
( i ) Transmitter It process and encode the information and make it suitable for transmission . The message signal for communication can be analog signals or digital signals .
An analog signal can be converted suitably into a digital signal and vice-versa .
[ An analog signal is that in which current or voltage value varies continuously with time .
A digital signal is a discontinuous function of time . Such a signal is usually in the form of pulses .]