Why Study Computers -University Degrees Online by yaohongmeiyes

VIEWS: 5 PAGES: 54

									         Chapter 5

        Telecom, Wireless &
        Networks
                                      Fundamentals
                                      Media, Devices, and Software
                                      Wireless Telecommunications
                                      Networks and Distributed Computing

  Please discontinue use of cell
  phone and turn off ringer


Succeeding with Technology
         5.1

         Fundamentals of
         Telecommunications

          Key Terms
         • Telecommunications   • Digital signal
         • Networking media     • Bandwidth
         • Analog signal        • Broadband




Succeeding with Technology
        Telecommunications

         Telecommunications: The electronic
          transmission of signals over a medium
          for communications.
                                                   (cables or air)




               Sender and Receiver must “speak” the same language.



Succeeding with Technology
        Types of Signals
           Analog Signal:
            transmit sound
            using continuously
            varying levels of
            voltage.

           Digital Signal:
            transmits data using
            two discrete states of
            voltage: high and low


Succeeding with Technology
        Signal Frequency

         Frequency: the speed at which a signal
          changes from high to low.
         Bandwidth: the range of signal frequencies
          that can be sent over a given medium at the
          same time.
             Often expressed as bits per second
             Broadband: typically 2 – 5 Mbps




Succeeding with Technology
         5.2

         Networking Media,
         Devices, and Software
                                  The fundamental components of
                                  telecommunications networks
             Key Terms
         •   Twisted pair cable       •   Network adapter
         •   Coaxial cable            •   Microwave transmission
         •   Fiber-optic cable        •   Communications satellite
         •   Radio wave               •   Ethernet
         •   Modem




Succeeding with Technology
        Networking Media
                                Twisted Pair Cable
                                 Used for traditional phone lines, twisted pairs of
                                 wires in plastic sheathing.

                                Coaxial Cable
                                 Used for home cable TV, thick copper core wire
                                 – faster than twisted pair.

                                Fiber Optic Cable
                                 Thin strands of glass are used to send light beams
                                 – highest bandwidth cable, most expensive.

                                Radio Waves
                                  Electromagnetic waves transmitted through the air
                                  at various frequencies.

Succeeding with Technology
        Radio Waves
         Radio waves use differing frequencies to carry
          many types of information:
               AM & FM Radio
               Short Wave & CB Radio
               Television Broadcasts
               Garage Doors Openers
               Baby Monitors
               Cordless Phones
               Cell Phones
               Radio Controlled Cars and Airplanes
               Global Positioning Systems
               Wireless Computer Networks
               Microwave Communications
                                     http://electronics.howstuffworks.com/radio-spectrum1.htm


Succeeding with Technology
           300 GHz
                     EHF
           30 GHz

           2.9 GHz
                     SHF
                             Deep space radio communications (2.29-2.3 GHz)
                     UHF     Wi-fi Wireless Networks (2.4 GHz)
                             Global Positioning System 1.23 and 1.58 GHz
                             Air traffic Control (960-1,215 MHz)
                             900-MHz cordless phones
                             Cell Phones (824-849 MHz)

         328.6 MHz
                     VHF     TV CH 7-13 (174-220 MHz)
                             FM Radio (88-108 MHz)
                             TV CH 2-6 (54-88 MHz)
                             Cordless Phones (40-50 MHz)
           30 MHz
                     HF      CB Radio (26.96-27.41 MHz)

            3 MHz
                     MF      AM Radio (535-1700 kHz)
           300kHz

            30 kHz
                     LF

            10 kHz
                     VLF
                                                              http://www.fcc.gov/oet/spectrum/
              The Radio Spectrum

Succeeding with Technology
        Networking Devices

               Modem: modulates and demodulates
                signals from one form to another.



               Network Adapter: Expansion card, or
                external device installed on a computing
                device used to connect to a network.



Succeeding with Technology
        Networking Devices

       Network Control Devices:
           Hub/Switch
               Controls flow of data between
                devices on a network
           Router
               Routs packets to destinations and
                connects one network to another
           Wireless Access Point
               Allows devices to connect
                wirelessly to a wired network



Succeeding with Technology
Succeeding with Technology
       Microwave Communications




                   High-frequency radio signals sent
                   up to 30 miles through the air.


                                                       13

Succeeding with Technology
       Microwave Communications


                             Line-of-sight communications




                                                            14

Succeeding with Technology
       Microwave Communications
                             SatelliteTransmission



                             Line-of-sight required




                                                      15

Succeeding with Technology
        Networking Software

       Network administrators are responsible for
        setting up and maintaining the network.
       A network operating system coordinates the
        network components to support
        telecommunications.
       Ethernet is the most widely used network
        standard for private networks.




Succeeding with Technology
         5.3

         Wireless
         Telecommunications
         Technologies

             Key Terms
         •   Cellular network            •   WiMAX
         •   Cellular carrier            •   Bluetooth
         •   Global positioning system   •   Radio frequency identification
         •   Wireless fidelity (wi-fi)   •   Near-field communication (NFC)




Succeeding with Technology
        Cell Phone Technologies
   A cellular network is a radio network in
    which a geographic area is divided into
    cells, with a transmission tower and
    station at the center of each cell, to
    support mobile communications.




Succeeding with Technology
        Cell Phone Technologies

          A cellular carrier is a company that
           builds and maintains a cellular
           network and provides cell phone
           service to the public.




Succeeding with Technology
                                      GSM        CDMA
                                      AT&T       Verizon
        GSM and CDMA                  T-Mobile   Sprint




       Digital networking standards for
        cell phone networks are GSM
        and CDMA.
       GSM is the most popular global
        standard for mobile phones
       The CDMA networking standard
        is predominantly used in the
        United States where it is in equal
        competition with GSM.


Succeeding with Technology
                                     GSM         CDMA
                                     AT&T        Verizon
        GSM and CDMA                 T-Mobile    Sprint




       GSM Phones include a subscriber
        identity module (SIM) for security and
        convenient data transfer between
        phones.




Succeeding with Technology
        Cell Phone Technologies

          Consumers choose a carrier based
           on coverage area, handsets
           available, and services provided –
           service contracts are typically for
           two years.




Succeeding with Technology
        Cell Phone Technologies

          Learn about Service Plans,
           Handsets, Features, and Services
           by clicking the logos below.




Succeeding with Technology
        Cell Phone Technologies




Succeeding with Technology
        Cell Phone Technologies

       Cell phone accessories provide added
        features for example…
           A 4 GB mini SD memory card can provide ample storage
            digital photos, music, and video files.
           A Bluetooth headset allows you to interact with your
            phone without taking it out of your pocket.
           Car chargers allow you to
            charge your cell phone from
            your car power supply.
           Assorted cases protect cell
            phones from damage and
            make them handy to access.


Succeeding with Technology
        Wireless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth.    Aircraft Navigation




Succeeding with Technology
        Wireless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth.    Seacraft Autopilot




Succeeding with Technology
        Wireless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth. Automobile Navigation




Succeeding with Technology
        Wireless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth. Handheld Navigation




Succeeding with Technology
        Wireless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth.
                                                 Child Safety




Succeeding with Technology
        Wirless Technologies
        The Global Positioning System
         (GPS) uses satellites to pinpoint the
         location of receivers on earth.
                                           Emergency Call




Succeeding with Technology
        Wireless Technologies
     Wireless Fidelity (IEEE 802.11s), or Wi-fi, is
      wireless networking technology that makes use
      of access points to connect devices to
      networks.                              • 250-1,000 ft range
                                                     • 802.11b 4.5 Mbps
                                                     • 802.11g 11 Mbps
                                                     • 802.11n 74 Mbps
                                                     • www.boingo.com

                             Access
                             Point




Succeeding with Technology
         Wireless Technologies

                             WiMAX (IEEE 802.16) is the
                              next generation broadband
                              technology that is both faster and
                              has a longer range than Wi-fi –
                              31 miles!




Seattle’s Space Needle To                  http://en.wikipedia.org/wiki/WiMAX
Become WiMax Antenna

Succeeding with Technology
        Wireless Technologies
         Bluetooth is wireless technology
          that enables a wide variety of
          digital devices to communicate
          directly.
                                             • 33 ft range
                                             • 1 Mbps
                                             • www.bluetooth.com




Succeeding with Technology
        Bluetooth




Succeeding with Technology
        Wireless Technologies

         Infrared (IrDA) technology utilizes infrared
          rays to send data over a short distance
          wirelessly.
                             • 14 ft range
                             • Narrow-angle cone (30o)
                             • Line-of-sight
                             • 4-16 Mbps
                             • www.mzoop.com




Succeeding with Technology
        Wireless Comparison

           Wi-fi    Access      Omni-       Through      250 ft    11 Mbps
                    point       direction   obstructions range
                    centered                             indoors
                    LAN
        Bluetooth Point-to-     Omni-       Through      33 ft     1 Mbps
                  point         direction   obstructions


         Infrared   Point-to-   Narrow-     Line-of-sight 14 ft    4 Mbps
                    point       angle




Succeeding with Technology
           Wireless Technologies
    Radio Frequency ID (RFID) uses tiny
     transponders in tags that can be
     attached to merchandise or other
     objects and read using an RFID
     receiver or reader for the purpose of
     identification.




  http://www.rfidjournal.com/

Succeeding with Technology
           Near Field Communication
           (NFC)
         NFC is a short range wireless
          technology that is designed for
          private communications at short
          range, such as making payments
          by swiping a cell phone across a
          pad.




  http://www.rfidjournal.com/

Succeeding with Technology
         5.4

         Networks and Distributed
         Computing

             Key Terms
         •   Personal Area Network       • Wide Area Network
         •   Local Area Network
         •   Intranet
         •   Virtual Private Network
         •   Metropolitan Area Network




Succeeding with Technology
        Computer Network Concepts
                  Distributed Computing
                   refers to a computing
                   environment that includes
                   multiple remote computers
                   that work together to solve
                   problems and provide
                   services.
                            Database Servers
                            Application Servers
                            File Servers
                            Print Servers


Succeeding with Technology
           Network Types

            Personal Area Network (PAN)
                 The wireless interconnection of
                  personal information technology
                  devices within the range of an
                  individual.
                 Mostly associated with Bluetooth
                  technology




Succeeding with Technology
  http://www.scottevest.com/v3_product_info/features.shtml
        Network Types

         Personal Area Network (PAN) – Alternate
          Definition
             The human body is used to conduct a minimal
              electric current to transfer information from one
              individual’s device to another’s. The original PAN was
                                                 designed by Thomas
                                                        Zimmerman and allowed
                                                        users to pass digital
                                                        electronic information
                                                        through touch, by transferring
                                                        information from one
                                                        person’s device to another’s,
                                                        running a subtle current
                                                        through the body.
                                       http://www.almaden.ibm.com/cs/user/pan/pan.html


Succeeding with Technology
      Exchange emails through handshake

      TWO Japanese telecoms giants have developed technology that turns the human body
      into a broadband-paced link that allows e-mail addresses to be exchanged through a
      simple handshake, a report said Monday.
      The technology, developed by Nippon Telegraph and Telephone Corp. and its subsidiary
      NTT DoCoMo Inc., uses the body's conductivity and adds the smarts of a personal digital
      assistant (PDA), the Nihon Keizai Shimbun said.
      A device attached to a PDA can send and receive weak electrical signals through people,
      with human bodies as communications circuits, the paper said, citing sources close to
      the companies.
      Apparel and handbags have their own conductivity, allowing an electrical connection to a
      PDA that can remain in one's pocket, the paper said.
      In this way, people can exchange e-mail addresses, names and phone numbers while
      shaking hands, with the data automatically written into both their PDAs, the paper said.
      The companies have confirmed in an experiment that data can be transmitted at 10
      megabits per second, comparable to the speed of a broadband Internet connection, it
      said.
      The technology could allow data communications through door knobs, switches, desks
      and chairs, the paper said. It could pave the way to one day being able to pass through
      railway ticket gates or entering secure buildings with a simple touch. It could also get a
      computer to start up with the proper settings as soon as the user sat down, the paper
      said.
      Agence France-Presse




Succeeding with Technology
  Microsoft patents body power
  By Matt Loney
  Staff Writer, CNET News
  June 23, 2004 6:50 AM PDT

  Microsoft has been awarded a patent for using human skin as a power
  conduit and data bus.

  Patent No. 6,754,472, which was published Tuesday, describes a method
  for transmitting power and data to devices worn on the body and for
  communication of data between those devices.

  To reduce the redundancy of input/output devices, Microsoft's patent
  proposes a personal area network that allows a single data input or output
  device to be used by multiple portable devices.
  …

  Furthermore, Microsoft said, the physical resistance offered by the human
  body could be used to create a virtual keyboard on a patch of skin. And
  just to make sure it has covered all its bases, the filing concludes with a
  reference for Fido.

  "It will be apparent," it says, "that the body may be that of a wide variety of
  living animals and need not be limited to being a body of a human being."




Succeeding with Technology
        Network Types

         Local Area Network (LAN)
             Connects computer systems and devices
              within a common geographic area




Succeeding with Technology
        Local Area Network


                     switch
                                            Wireless
                      Star                  access point
                      topology                             System Administrator




                                 Bus
                                 topology


     Servers
Succeeding with Technology
        Network Types

         Intranet
             A private network that utilizes Internet
              and Web protocols and software.
         Virtual Private Network (VPN)
             Uses the Internet to connect an
              organization’s networks dispersed around
              the world into one large intranet.



Succeeding with Technology
        Network Types
      A Metropolitan Area Network (MAN)
       connects networks within a city or
       metrololitan-size area into a larger high-
       speed network.




Succeeding with Technology
        Network Types
   Wide Area Network
   Connects LANs between cities,
   cross country, and around the   router
   world using microwave and
   satellite transmission or
                                            FSU Tallahassee LAN
   telephone lines.




                                            router

          FSU Panama City LAN
Succeeding with Technology
        Network Types

         A Global Network (International
          Network) is a WAN that crosses
          National boundries.




Succeeding with Technology
        Network Types
        Electronic Data Interchange, or EDI, uses
         networked systems and follws standards
         and procedures that allow output from one
         system to be processed directly as input to
         other systems, without human participation.




Succeeding with Technology
           Installing Home Wi-fi

         Requirements
             High-speed Internet
             Cable Modem or DSL
              Modem (provided be
              ISP)
             Wireless Access
              Point/Router
             Wireless adapters for
              each device.               Wireless Access
                                         Point / Router
             Additional Access Points
              as needed.                 Cable Modem       To Cable Co.




Succeeding with Technology
       Chapter 5 Questions?




  Don’t forget to turn
  your phone on!!

Succeeding with Technology

								
To top