Data Communications

=DATA COMMUNICATIONS=

INTRODUCTION
Data communication deals with the transmission of signals in a reliable and efficient manner. The fundamental purpose of a communications system is the exchange of data between two parties. Below is a diagram showing the Components of a communication model.

Simplified Communications Model

 * Source– this device generates the data to be transmitted eg telephones and personal computers
 * Transmitter – transforms and encodes the information in such a way as to produce electromagnetic signals that can be transmitted across some sort of transmission system eg a modem
 * Transmission system – can be a single transmission line or a complex network connecting source and destination.
 * Receiver – accepts the signal from the transmission system and converts it into a form that can be handled by the destination device
 * Destination – takes the incoming data from the receiver

KEY TASKS THAT MUST BE PERFORMED IN A DATA COMMUNICATIONS SYSTEM

 * 1) Transmission System Utilization
 * 2) Interfacing
 * 3) Signal Generation
 * 4) Synchronization
 * 5) Exchange Management
 * 6) Error detection and correction
 * 7) Addressing and routing
 * 8) Recovery
 * 9) Message formatting
 * 10) Security
 * 11) Network Management