Data Communication System in Computer Network - rlmdtechnical

                 Data Communication System in computer network

       

Introduction
Today the computer is available in many offices and homes, and hence the need to share data and programs between different computer users with the promotion of data communication facility. The communication between computers has increased so that it brings the computer power out of the computer room. Today, sitting in one place can contact the computer located on a remote site through the Communication channel is there.

Data communication

In everyday life, we use some kind of communication medium. For the communication of information and messages we use telephone and postal communication systems. Similarly, data and information communication from one system to another may also be transmitted outside the geographical area. Data transmission is the dissemination of information by using some standard rules. These methods include communication of electrical signals through conductor, optical fiber and communication of optical signal by electromagnetic field.

Assume that the manager has to write some letters to all his clients. To prepare a letter, first he will have to use his PC and word processing package. If all clients are connected to PC through PC networking, then data and information, computer files and other programs are transmitted from one computer system to another in a few seconds. New forms of communication such as email and internet are only due to computer networking.

The main elements of the communication system:

The following are some of the main requirements for the functioning of any communication system-

1. A sender who prepares the message to be transmitted.

2. Message carrying medium.

3. A receiver who receives the message.

In the data communication, 4 words are mainly used in the work.

1. Data: A group of raw data that takes the form of information after processing.

2. Signal: Electrical electromagnetic encoding of data.

3. Signaling: Signaling on the communication medium.

4. Transmission: Communication of data received by signal processing.

Communication links.

The answer is Data Communication Software. This is software which facilitates interaction with other systems. Data Communication Software directs computer systems and devices to transfer data from one place to another. The method of data transformation in the form of software is called protocol.

Data transmission software or protocols do the following for transmission error-free transmission.

1. Data Sequencing: The long message to be transmitted is broken into small packets, so that the data transmission error is free.

2. Data routing: Before sending this data, the process of finding the most suitable route between the source and the destination is processed.

3.flow control: All machines in the context of motion do not have the same capability. Hence, the control of dataflow, the process of sending data between the fast sender and the slow receiver.

4. Error Control: There are two main functions of error detection and error recovery communication software to see that the data is transmitted without error.