Data communication –It is the exchange of data between
two devices via some form of medium like cable or any wire. A communication
system is made up of a combination of software and hardware. For successful
communication between two devices, both of the devices should be part of
communication system.
Four
fundamental characteristics of data communication:-
1)
Delivery: Data must be delivered to correct
destination by system and it should be received by user of that destination
device only.
2)
Accuracy: Data must be delivered to user
accurately without any alteration or loss. An altered data is useless.
3)
Timeliness: Data must be delivered in timely
manner. Audio and video type of data be delivered in real-time i.e. they must
be delivered timely as they are produced and in the same order they are
produced.
4)
Jitter: It refers to variation in packet
arrival time. Time duration between arrivals of each two consecutive data
packets must be equal.
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