Chapter 5: Telecommunications  and Networks Succeeding with Technology: 2005 Update Edition
Objectives <ul><li>Understand the fundamentals of data communications and the criteria for choosing a communications mediu...
Fundamentals of Telecommunications <ul><li>Communications </li></ul><ul><ul><li>Transmission of a signal by way of a mediu...
Telecommunications and Data Communications <ul><li>Telecommunications  </li></ul><ul><ul><li>Electronic transmission of si...
Characteristics of Telecommunications <ul><li>Analog signal </li></ul><ul><ul><li>Continuously changes over time </li></ul...
 
 
Transmission Capacities <ul><li>Bandwidth </li></ul><ul><ul><li>Range of signal frequencies that can be sent over a given ...
 
Networking Media <ul><li>Twisted-pair cable  </li></ul><ul><ul><li>Cable consisting of pairs of twisted wires   </li></ul>...
 
Networking Media (Continued) <ul><li>Microwave transmission </li></ul><ul><ul><li>High-frequency radio signal that is sent...
 
 
Networking Media (Continued) <ul><li>Wireless fidelity (Wi-Fi)  </li></ul><ul><ul><li>Wireless networking devices that use...
 
Networking Devices <ul><li>Modems </li></ul><ul><ul><li>Modulates and demodulates signals  </li></ul></ul><ul><ul><li>Cabl...
 
Network Control Devices <ul><li>Hubs </li></ul><ul><ul><li>Used as a central point for connecting a series of computers </...
Network Control Devices (Continued) <ul><li>Gateway  </li></ul><ul><ul><li>A network point that acts as an entrance to ano...
Radio Frequency Identification (RFID) Devices <ul><li>Tiny microprocessor combined with an antenna </li></ul><ul><li>Track...
 
Summary <ul><li>Telecommunications  </li></ul><ul><ul><li>Electronic transmission of signals for communication </li></ul><...
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Chapter 5: Telecommunications and Networks

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Chapter 5: Telecommunications and Networks

  1. 1. Chapter 5: Telecommunications and Networks Succeeding with Technology: 2005 Update Edition
  2. 2. Objectives <ul><li>Understand the fundamentals of data communications and the criteria for choosing a communications medium </li></ul><ul><li>Explain how networking media, devices, and software work together to provide data networking services </li></ul>
  3. 3. Fundamentals of Telecommunications <ul><li>Communications </li></ul><ul><ul><li>Transmission of a signal by way of a medium </li></ul></ul><ul><li>Signal </li></ul><ul><ul><li>Contains message comprised of data and information </li></ul></ul><ul><li>Communication medium </li></ul><ul><ul><li>Anything that carries a signal between a sender and a receiver </li></ul></ul>
  4. 4. Telecommunications and Data Communications <ul><li>Telecommunications </li></ul><ul><ul><li>Electronic transmission of signals for communications </li></ul></ul><ul><li>Data communications </li></ul><ul><ul><li>Electronic collection, processing, and distribution of data </li></ul></ul><ul><li>Telecommunications network </li></ul><ul><ul><li>Connects communications and computing devices </li></ul></ul><ul><li>Networking media </li></ul><ul><ul><li>Anything that carries an electronic signal </li></ul></ul>
  5. 5. Characteristics of Telecommunications <ul><li>Analog signal </li></ul><ul><ul><li>Continuously changes over time </li></ul></ul><ul><li>Digital signal </li></ul><ul><ul><li>At any given time is either high or low </li></ul></ul><ul><li>Signal frequency </li></ul><ul><ul><li>Speed at which signal can change from high to low </li></ul></ul>
  6. 8. Transmission Capacities <ul><li>Bandwidth </li></ul><ul><ul><li>Range of signal frequencies that can be sent over a given medium at the same time </li></ul></ul><ul><li>Broadband media </li></ul><ul><ul><li>Significantly faster than narrowband </li></ul></ul><ul><ul><li>Any media faster than 200 Kbps (kilobits per second) or 2 Mbps (megabits per second) </li></ul></ul><ul><li>Narrowband </li></ul><ul><ul><li>Anything below 200 Kbs </li></ul></ul>
  7. 10. Networking Media <ul><li>Twisted-pair cable </li></ul><ul><ul><li>Cable consisting of pairs of twisted wires </li></ul></ul><ul><li>Repeaters </li></ul><ul><ul><li>Used to boost signal so that it can travel longer distances </li></ul></ul><ul><li>Coaxial cable </li></ul><ul><ul><li>Inner conductor wire surrounded by insulation, a conductive shield, and a cover </li></ul></ul><ul><li>Fiber-optic cable </li></ul><ul><ul><li>Thousands of thin strands of glass or plastic bound together in a sheathing </li></ul></ul>
  8. 12. Networking Media (Continued) <ul><li>Microwave transmission </li></ul><ul><ul><li>High-frequency radio signal that is sent through the air </li></ul></ul><ul><li>Communications satellite </li></ul><ul><ul><li>A microwave station placed in outer space </li></ul></ul><ul><li>Global positioning system (GPS) </li></ul><ul><ul><li>Uses satellites to pinpoint the location of objects on earth </li></ul></ul>
  9. 15. Networking Media (Continued) <ul><li>Wireless fidelity (Wi-Fi) </li></ul><ul><ul><li>Wireless networking devices that use the 802.11 protocol </li></ul></ul><ul><ul><li>Uses wireless access points </li></ul></ul><ul><li>Bluetooth </li></ul><ul><ul><li>Enables digital devices to communicate wirelessly over short distances </li></ul></ul><ul><ul><li>Communicates at speeds of up to 1 Mbps within a range of up to 33 ft </li></ul></ul><ul><li>Infrared transmission </li></ul><ul><ul><li>Sending signals through the air via light wave </li></ul></ul>
  10. 17. Networking Devices <ul><li>Modems </li></ul><ul><ul><li>Modulates and demodulates signals </li></ul></ul><ul><ul><li>Cable modem </li></ul></ul><ul><ul><ul><li>Provides Internet access over a cable television network </li></ul></ul></ul><ul><ul><li>DSL modem </li></ul></ul><ul><ul><ul><li>Connects digital devices using a digital signal over telephone service (POTS) lines </li></ul></ul></ul><ul><li>Network adapter </li></ul><ul><ul><li>Computer circuit board, PC Card, or USB device </li></ul></ul>
  11. 19. Network Control Devices <ul><li>Hubs </li></ul><ul><ul><li>Used as a central point for connecting a series of computers </li></ul></ul><ul><li>Switches </li></ul><ul><ul><li>Fundamental part of most networks </li></ul></ul><ul><li>Repeaters </li></ul><ul><ul><li>Connect multiple network segments </li></ul></ul><ul><li>Bridges </li></ul><ul><ul><li>Connect two or more network segments </li></ul></ul>
  12. 20. Network Control Devices (Continued) <ul><li>Gateway </li></ul><ul><ul><li>A network point that acts as an entrance to another network </li></ul></ul><ul><li>Routers </li></ul><ul><ul><li>Can divide a single network into two logically separate networks </li></ul></ul><ul><li>Wireless access point </li></ul><ul><ul><li>Receives and transmits data to wireless adapters </li></ul></ul><ul><li>Firewall </li></ul><ul><ul><li>Device or software that filters the information coming onto a network </li></ul></ul>
  13. 21. Radio Frequency Identification (RFID) Devices <ul><li>Tiny microprocessor combined with an antenna </li></ul><ul><li>Tracks merchandise from supplier to retailer to customer </li></ul>
  14. 23. Summary <ul><li>Telecommunications </li></ul><ul><ul><li>Electronic transmission of signals for communication </li></ul></ul><ul><li>Computer network </li></ul><ul><ul><li>Connects computers for data communications </li></ul></ul><ul><li>Network media </li></ul><ul><ul><li>Cables and wireless signals </li></ul></ul><ul><li>Networking devices </li></ul><ul><ul><li>Modems, network adapters, network control devices, RFID devices, and pagers </li></ul></ul>
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