what is data communication and how data communicates?

DATA COMMUNICATION

Definition:

                 " It is the exchange of data between two devices,via some from of transmission media(such as wire or cable)."

• Data communication is local if communicative devices are in the same building and is considered remote if the devices are far apart .

 

 

        For Data communication to occur it depends on three  fundamental characteristics:

1. Delivery:   The system must deliver data to the correct destination. 
2. Accuracy:The system must deliver data accurately.
3. The system must deliver data in timely manner.

  

     Data communication  there are system made five components that are:

       Message:

• The message is the information is to be communicated.
• It consist of text ,numbers ,pictures,sounds,videos or may a combination of all these.

    Sender:

• The sender is the device that sends the data message.
• It can be a computer ,workstation,telephone,handset,video and so on.

      Receiver:

• The device which the message is called receiver.

      Medium:

• The transmission medium is the physical path by which a message from sender to receiver.
• IT can be twisted dair cable ,coaxial cable ,fibre optic cable ,laser,radio webs (Terrostrial or satellite).

      Protocol:

•  A protocol is a set of rules that govern data communication .
• It represent an aggrements between the communicating devices.