POWERPOINT PRESENTATION

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Presentation transcript:

POWERPOINT PRESENTATION DATA COMMUNICATION

DATA COMMUNICATON Data communications (DC) is the process of using computing and communication technologies to transfer data from one place to another, and vice versa. It enables the movement of electronic or digital data between two or more nodes, regardless of geographical location, technological medium or data contents.

Transmission Modes Transmission mode refers to the mechanism of transferring of data between two devices connected over a network. It is also called Communication Mode. These modes direct the direction of flow of information. There are three types of transmission modes. They are: 1. Simplex Mode 2. Half duplex Mode 3. Full duplex Mode

1. SIMPLEX MODE 2. HALF DUPLEX MODE In this type of transmission mode, data can be sent only in one direction i.e. communication is unidirectional. 2. HALF DUPLEX MODE Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time.

FIG. :- HALF DUPLEX 3. FULL DUPLEX Mode In full duplex system we can send data in both the directions as it is bidirectional at the same time in other words, data can be sent in both directions simultaneously.

COMPONENTS OF DATA COMMUNICATION 1. Message 2. Sender 3. Receiver 4. Medium 5. Software

1. Message The message is the data or information to be communicated. It may consist of text, number, pictures, sound, video or any a combination of these. 2. Sender Sender is a device that sends message. The message can consist of text, numbers, pictures etc. it is also called source or transmitter. Normally, computer is use as sender in information communication systems.

3. Receiver Receiver is a device that receives message. It is also called sink. The receiver can be computer, printer or another computer related device. The receiver must be capable of accepting the message. 4. Medium Medium is the physical path that connects sender and receiver. It is used to transmit data. The medium can be a copper wire, a fiber optic cable, microwaves etc. it is also called communication channel.

5. Software Software is used to provide remote access to systems and exchange files and messages in text, audio and/or video formats between different computers or users.

DIFF. B/W LAN MAN WAN BASIS OF COMPARISION LAN MAN WAN Expands to Local Area Network Metropolitan Area Network Wide Area Network Meaning A network that connects a group of computers in a small geographical area. It covers relatively large region such as cities, towns. It spans large locality and connects countries together. Example Internet. Ownership of network Private Private or Public Design Easy Difficult Speed High Moderate Low