What is data communication?

Data Communication:

           

Every person need to send message to, or use the same data, or receive messages from, or share program at many different locations. One answer to this problem is to keep separate data files at each location, but this approach is very costly and potentially a dangerous solution. It is very expensive to maintain these redundant files of data and difficult to ensure the continuing accuracy of data at any one location. The solutions of both, the need for more power and ability to receive, send messages and share data is found in data communication technology.

            The spending of data electronically from one location to another is data communication. In the computers located in same room, in office or in a building, the communication of data is done through a direct cable link; for e.g. a multi-user system is linked by a several systems through direct cable.

            Communications usage is growing day by day. Today’s, mini and large machines are in constant communication with outlying terminals. Computers can use telecommunications Hotel reservation system, Airlines etc.

Form of Data Transmission:

            There are two forms transmission of data:

i)                    Digital data transmission

ii)                   Analog data transmission

Digital Data Transmissions (DDT)

            Digital data transmission is the transmission of data using distinct OFF and ON electrical states. Computer represents the data in the form OFF and ON electrical states. These two states are represented by a 0 for OFF and 1 for ON.

Analog Data Transmission (ADT)

            Analog data transmission is the data transmission of data in a continues waveform for example telephone system is designed for analog data transmission.