Data communication:
Data communication is the process of using computing and communication
technologies to transfer data from one place to another and vice-versa.
The key elements of data communication model are
(i) Source:
This device generates the data to be transmitted; examples are telephones and
personal computers.
(ii) Transmitter:
The transmitter that transforms and encodes the information across some sort of
transmission system. The device that converts the signal from the source in a
transmittable form. So that the signal can propagate through the transmission
medium is called transmitter.
(iii) Transmission system:
This can be a signal transmission line or a complex network connecting source
and destination.
(iv) Receiver:
The receiver accepts the signal from the transmission system and converts it
into a form that can be handled by the destination device.
For example, a modem will accept an analog signal
coming from a network or transmission line and convert it into a digital bit
stream.
(v) Destination:
The last component of a data communication system is called the destination. It
receives the data from the receiver and concludes the communication process.
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