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Telecommunications. Chapter 5. The Components of an Information System. Importance of Telecommunications. Work Group Communication E-mail Video conferencing Emerging Business Applications Electronic Commerce Electronic Data Interchange (EDI) Rapid rate of change in technology.

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Presentation Transcript

The components of an information system
The Components of an Information System


Importance of telecommunications
Importance of Telecommunications

  • Work Group Communication

    • E-mail

    • Video conferencing

  • Emerging Business Applications

    • Electronic Commerce

    • Electronic Data Interchange (EDI)

  • Rapid rate of change in technology


Data communication
Data Communication

  • All communications require three things:

    • Senders and receivers that have something to share

      • Coded by sender

      • Decoded by receiver

    • A pathway or transmission media to send the message

    • Rules or protocols of communication



Computer networks
Computer Networks

  • Computers and other devices connected by a communications channel

    • Share files and other resources between users

  • Channel: the transmission media

  • Bandwidth: carrying capacity of the media

  • Protocols: the physical and logical rules for transmission


Remaining topics
Remaining Topics

  • Computing Network Models

  • Classes of Computer Networks

  • Building Blocks of Computer Networks


Computing network models
Computing Network Models

  • Centralized computing

    • Uses mainframes and “dumb” terminals

  • Distributed computing

    • Uses separate computers

  • Collaborative computing

    • Uses two or more networked computers

  • Networks today include all three models





  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

  • Building Blocks of Computer Networks


Classes of computer networks
Classes of Computer Networks

  • Private Branch Exchange (PBX)

    • A privately owned telephone switch

  • Local Area Network (LAN)

    • Usually confined to a single building or site

  • Wide Area Network (WAN)

    • Enterprise network - one organization

    • Global network





  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks


Building blocks of computer networks
Building Blocks of Computer Networks

  • Servers, Clients, and Peers

  • Network Services

  • Transmission Media

  • Network Topologies

  • Network Access Control Methods

  • Major Standards


Servers clients and peers
Servers, Clients, and Peers

  • Server-centric networks

    • Server

      • A network computer that makes services available to users

    • Client

      • Uses services provided by a server

  • Peer-to-peer networks

    • Allow any computer or device to provide and request services



  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services

    • Transmission Media

    • Network Topologies

    • Network Access Control Methods

    • Major Standards


Network services
Network Services

  • Offered by the network operating system

    • File services

      • Store, retrieve, and move data

    • Print services

      • Control access to printers and fax machines

    • Message services

      • Deal with communication between network users

    • Application services

      • Run software for network clients


  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services

    • Transmission Media

    • Network Topologies

    • Network Access Control Methods

    • Major Standards


Transmission media
Transmission Media

  • The physical pathway that carries signals

  • Media characteristics

    • Bandwidth - transmission capacity stated in megabits per second (Mbps)

    • Attenuation - weakening of signal over distance

    • EMI - electromagnetic interference

  • Two forms

    • Cable media

    • Wireless media


Cable media
Cable Media

  • Twisted Pair

    • Two or more pairs of insulated copper wires

  • Coaxial

    • Inner copper conductor surrounded by plastic insulation with outer braided foil shield

  • Fiber Optic

    • Uses pulses of light to send data

    • Glass or plastic core surrounded by cladding with a tough outer sheath


Wireless media
Wireless Media

  • Infrared Line of Sight

    • Light waves transmit data on unobstructed path

  • High-Frequency Radio

    • Radio signals up to 39.6 meters

  • Microwave Line of Sight

    • Terrestrial uses earth-based antennas

    • Satellite sends signals between antennas on earth and orbiting satellites


  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services

    • Transmission Media (Cable, Wireless)

    • Network Topologies

    • Network Access Control Methods

    • Major Standards


Network topologies
Network Topologies

  • Star Network

    • All nodes attached to center a hub

    • Messages must pass through the hub

  • Ring Network

    • A closed loop

    • Messages move in one direction

  • Bus Network

    • An open-ended line

    • Nodes receive message at the same time





  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services

    • Transmission Media (Cable, Wireless)

    • Network Topologies (Star, Ring, Bus)

    • Network Access Control Methods

    • Major Standards


Network access control methods
Network Access Control Methods

  • Distributed Access Control

    • Token passing

      • Circulating electronic token prevents collisions

      • Must possess the token to transmit a message

  • Random Access Control

    • CSMA/CD

      • “Listen” for quiet line; then send message

      • Collision occurs with simultaneous messages

      • Must wait and resend



  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services

    • Transmission Media (Cable, Wireless)

    • Network Topologies (Star, Ring, Bus)

    • Network Access Control Methods (Distributed—Token passing, Random)

    • Major Standards



The osi model and message passing
The OSI Model andMessage Passing


Network operating systems
Network Operating Systems

  • Client/server architecture LANs

    • The system software runs on the file server

    • Part of the NOS runs on each workstation

  • Peer-to-peer networks

    • NOS is installed on each attached workstation

    • Runs on top of the local operating system


  • Computing Network Models

    • Centralized, distributed, collaborative

  • Classes of Computer Networks

    • PBX, LAN, WAN (enterprise & global)

  • Building Blocks of Computer Networks

    • Server-centric/peer-to-peer

    • Network Services (File, print, message, application)

    • Transmission Media (Cable, Wireless)

    • Network Topologies (Star, Ring, Bus)

    • Network Access Control Methods (Distributed -Token passing, Random)

    • Major Standards (The OSI Model)


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