Lecture 1.ppt - Lecture 1 Introduction Overview Concepts of data communications and networking Data communications components data representation and

Lecture 1.ppt - Lecture 1 Introduction Overview Concepts of...

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Lecture 1 Introduction
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Concepts of data communications and networking Data communications components, data representation, and data flow Network topologies Categories of networks, and the general idea behind the Internet. Protocols and standards Overview
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DATA COMMUNICATIONS DATA COMMUNICATIONS The term The term telecommunication telecommunication means communication at means communication at a distance. Tele i.e; far a distance. Tele i.e; far The word The word data data refers to information presented in refers to information presented in whatever form is agreed upon by the parties creating whatever form is agreed upon by the parties creating and using the data. and using the data. Data communication Data communication is the exchange of data between is the exchange of data between two devices via some form of transmission medium two devices via some form of transmission medium such as a wire cable or wireless media etc. such as a wire cable or wireless media etc. For data communications to occur, the communicating For data communications to occur, the communicating devices must be part of a communication system made devices must be part of a communication system made up of a combination of hardware (physical equipment) up of a combination of hardware (physical equipment) and software (programs). and software (programs).
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Effectiveness depends on three characteristics: Delivery ( deliver data to the correct destination ) Accuracy ( deliver the data accurately ) Timeliness ( deliver data in a timely manner; without significant delay; data delivered as soon as produced real-time delivery ) Jitter ( variation in the packet arrival time; uneven delay in packet delivery ; results in uneven quality) Data Communication System
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1. Message : information (data) to be communicated; text, numbers, pictures, audio, and video 2. Sender : Device that sends message; computer, workstation, telephone handset, video camera 3. Receiver: device that receives the message; computer, workstation, telephone handset, television, and so on. 4. Transmission medium: P hysical path by which a message travels from sender to receiver; twisted-pair wire, coaxial cable, fiber-optic cable, and radio waves etc. 5. Protocol: Set of rules that govern data communications; represents an agreement between the communicating devices Components of data communication systems
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Five components of data communication
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Text: Represented as a bit pattern, a sequence of bits (Os/1s). Different sets of bit patterns have been designed to represent text symbols. Each set is called a code, and the process of representing symbols is called coding. prevalent coding system is called Unicode; uses 32 bits to represent a symbol or character.
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  • Fall '19
  • Kinza Sattar

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