DATA COMMUNICATION:
If one is communicating means sharing some relevant data these sharing can be local or remote. While sharing information face to face is called as local whereas sharing over some distance is called as remote. The term telecommunication may include telephone, telegraph etc., and communication means at a distance.
And the term data communication determines exchange of information between two devices by using some transmission medium.
Data communication depends upon some basic characteristics:
Delivery:
The term delivery means sending data to the intended destination.
Accuracy:
The system will delivered the data without altering the information to the destination.
Timelines:
Data must delivered to the end device with in a timely manner, if the data is delivered late it will be useless.
Jitter:
Jitter is defined as variation in the packet arrival time. For example if we send a video packet every 30ms. If it is arrive with the delay of 30ms it will result in uneven quality in the video.
Components in data communication:
There are five components in data communication:
Message:
The message is the data to be communicated. Most popular form of message which may include text, pictures, video, audio and numbers.
Sender:
Sender is the equipment that sends the message. Sender may include camera, telephone, computer and workstation and so on.
Receiver:
Receiver is the equipment that receives the information from medium, which may include camera, telephone, computer and workstation and so on.
Transmission medium or physical path:
In information is travelled form sender to receiver via some physical medium, some examples of transmission medium are radio waves, coaxial cables and twisted pair ,so on.
Protocol:
A protocol is defined as an agreement between communicating devices, without protocol the communication cannot be done connection of two devices may be done.