Data communication refers to the exchange of data between a source and a receiver. Data communication is said to be local if communicating devices are in the same building or a similarly restricted geographical area.The meanings of source and receiver are very simple.The device that transmits data is known as source and the device that receives the transmited data is known as receiver.Data communication aims at the transer of data and maintenance of the data during the process but not the actual generation of the information at the source and receiver.
ELEMENTS OF DATA COMMUNICATIONS:
i) Information/data
ii) digital encoded
iii) sender or receiver
iv) medium
ELEMENTS OF NETWORK:
i) hardware equipments
ii) software
iii) communication channels
iv) information/data/resource
v) protocols
Data Transmissions process between sender and receiver is refer to data communication and deployed physical environment (software/hardware/protocols/channels) is network.
TYPE OF DATA TRANSMISSION
SIGNAL is electronic or electromagnetic representation of data possibility analog or digital
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