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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
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
slide12
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
slide18
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
slide22
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
slide24
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
slide28
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
slide33
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
slide36
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
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
slide40
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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