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Telecommunication
 

Telecommunication

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    Telecommunication Telecommunication Presentation Transcript

    • 8 TELECOMMUNICATIONS AND NETWORKS c h a p t e r
    • SYSTEM COMPONENTS
      • COMPUTERS
      • TERMINALS: Input / output devices
      • COMMUNICATIONS CHANNELS
      • PROCESSORS: Modems, multiplexers, front-end processors
      • COMMUNICATIONS SOFTWARE
      • *
    • ANALOG SIGNAL
      • CONTINUOUS WAVEFORM
      • PASSES THRU SYSTEM
      • VOICE COMMUNICATIONS
      • *
      © 2002 by Prentice Hall
    • DIGITAL SIGNAL
      • DISCRETE WAVEFORM
      • TWO DISCRETE STATES:
        • 1-BIT & 0-BIT
        • ON / OFF PULSE
      • DATA COMMUNICATION
      • USES MODEM TO TRANSLATE ANALOG TO DIGITAL, DIGITAL TO ANALOG
      • *
      0010111010011101001010101110111100100010000101111010110100111010010010110010101101100
    • COMMUNICATION CHANNELS
      • MEANS BY WHICH DATA ARE TRANSMITTED:
      • TWISTED WIRES: Copper Wires
      • COAXIAL CABLE: Insulated Copper Wires
      • FIBER-OPTIC CABLE
      • MICROWAVE
      • *
      © 2002 by Prentice Hall
      • SUPER CLEAR GLASS STRANDS
      • FAST, LIGHT, DURABLE
      • TRILLIONS OF BITS PER SECOND, FULL DUPLEX
      • EXPENSIVE, HARDER TO INSTALL
      • OFTEN USED AS BACKBONE OF NETWORKS
      • *
      FIBER OPTICS SIGNAL LASER CABLE PHOTO DETECTOR SIGNAL
      • BACKBONE: Fiber optics cable carries light signals to distribution nodes, which use copper wires to user
      • DENSE WAVE DIVISION MULTIPLEXING (DWDM): Next-generation, uses many colors, (up to 160) each a channel, increases capacity of a fiber to 6.4 terabits per second
      • *
      FIBER OPTICS
    • WIRELESS TRANSMISSION TECHNOLOGIES
      • PAGERS: Small pager beeps when receives short message
      • CELLULAR TELEPHONE: Device uses radio waves to reach antennas within areas called cells
      • MOBILE DATA NETWORKS: Radio - based data network using hand-held computers, cheap, efficient
      • *
    • WIRELESS TRANSMISSION TECHNOLOGIES
      • PERSONAL COMMUNICATION SERVICE: Cellular; lower power; higher frequency. Smaller phones not shielded by buildings, tunnels
      • PERSONAL DIGITAL ASSISTANT: Pen sized, hand-held, digital communicator
      • SMART PHONE: Wireless, voice, text, Internet
      • *
    • ORBITING SATELLITES UPLINK MICROWAVE TRANSMISSION DOWNLINK
    • NETWORK TOPOLOGIES STAR HOST USER USER USER USER
    • NETWORK TOPOLOGIES BUS USER USER USER USER USER USER
    • NETWORK TOPOLOGIES RING USER USER USER USER
    • LOCAL NETWORKS
      • PRIVATE BRANCH EXCHANGE (PBX): firm’s central switching system
      • LOCAL AREA NETWORK (LAN): dedicated channels; limited distance (less than 2000 foot radius); higher capacity than PBX. Can share expensive hardware & software
      • *
    • LOCAL AREA NETWORK (LAN)
      • GATEWAY: Connection to other networks
      • ROUTER: Forwards data to other networks
      • NETWORK OPERATING SYSTEM (NOS): Manages file server; routes communications on network
      • PEER - TO - PEER: In some small networks all computers have equal power
      • *
      • Network spans large geographic distances. Can include cable, satellite, microwave
      • SWITCHED LINES: Route determined by current traffic
      • DEDICATED LINES: Constantly available for high-volume traffic
      • *
      WIDE - AREA NETWORK (WAN)
    • E-COMMERCE & E-BUSINESS TECHNOLOGIES
      • ELECTRONIC MAIL (e-mail)
      • GROUPWARE
      • VOICE MAIL
      • FACSIMILE MACHINES (fax)
      • TELECONFERENCING
      • DATACONFERENCING
      • VIDEOCONFERENCING
      • *
    • E-COMMERCE & E-BUSINESS TECHNOLOGIES
      • DIGITAL INFORMATION SERVICES: Commercial service provides desired mix
      • DISTANCE LEARNING: Education, training delivered over a distance, can include printed material, teleconferencing, interactive multimedia, Web sites
      • *
    • ELECTRONIC DATA INTERCHANGE (EDI)
      • COMPUTER - TO - COMPUTER
      • EXCHANGE BETWEEN TWO ORGANIZATIONS
      • OF STANDARD BUSINESS TRANSACTION DOCUMENTS
      • *
      COMPUTER COMPUTER SELLER CUSTOMER ORDERS, PAYMENTS SHIPPING NOTICES, PRICE UPDATES, INVOICES
    • Report by: Lea Lynn D. Halos BSIE-COMED 3F “ To effectively communicate, we must realize that we are all different in the way we perceive the world and use this understanding as a guide to our communication with others. ” T H A N K Y O U !!!