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LEARNING OBJECTIVE

Networking & Data communication

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CONTENTS Introduction Networking & Data communication Characteristics Components Reference

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NETWORKING & DATA COMMUNICATION

What is a Network? A network consists of 2 or more computers connected together, and they can communicate and share resources (e.g. information)

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NETWORKING & DATA COMMUNICATION……… Why Networking?• Sharing information — i.e. data

communication

• Data Communication-• Data Communication are the

exchange of data between two devices via some of transmission medium such as wire cable. For data communication to occur the communicating devices must be part of a communication system made up of a combination of hardware & software.

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SIMPLIFIED COMMUNICATION MODEL- DIAGRAM

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CHARACTERISTICSThe effectiveness of data communications

system depends on four Characteristics: Delivery:- The system must deliver data to

the correct destination . Data must be received by the intended device or user and only by that device or user.

Accuracy:-The system must deliver the data accuracy . data that have been altered in transmission and left uncorrected are unusable.

Timeliness:-The system must deliver data in a timely manner . Data delivered late are useless.In the case of video,audio,timely delivery

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CHARACTERISTICS….. means delivering data as they are produced ,

in the same order that they are produced , and without significant delay .This kind of delivery is called real-time transmission.

Jitter:-Jitter refers to the variation in the packet arrival time .It is the uneven delay in the delivery of audio or video.

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COMPONENTSA data communication has five components. Message:-The message is the information to

be communicated . Popular forms of information include text , numbers ,pictures , audio and video.

Sender:-The sender is the device that sends the data message .It can be a computer ,workstation ,telephone handset & so on.

Receiver:-The Receiver is the device that receives the message . It can be a computer , workstation, telephone handset and so on.

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COMPONENTS Transmission Medium:- The transmission

mode is the physical path by which a message travels from Sender to Receiver.

Protocol:- A protocol is set of rules that governs data communications. It represents an agreement between the communicating devices . Without a protocol , two devices may be connected but not communicating, just as a person speaking French cannot be understood by a person who speaks only japanese.

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FIGURE OF COMPONENTS

Rule 1:Rule 2:

…….…….

Rule n:

Rule 1:Rule 2:……..……..

Rule n:Message

Sender ReceiverMedium

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COMMUNICATION TECHNOLOGY APPLICATIONS

voice mail

e-mailinstant

messaging

telephony videoconferencing

collaboration groupware global positioning system (GPS)

newsgroups

Twitter

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BY REFERENCEBehrouz A. ForouzanInternet

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THANKYOU!!!