Communication and Networks

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Discuss the purpose of the components required for successful communications and identify various sending and receiving devices …

Discuss the purpose of the components required for successful communications and identify various sending and receiving devices

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  • 1. JGD10103 :Discovering INFORMATIONINTRODUCTION TO Computers 2010 TECHNOLOGY Living in a Digital WorldRAHIMAH BTE KASSIM
  • 2. Objectives Overview Discuss the purpose of the List advantages of using a components required for Describe the uses of network, and differentiatesuccessful communications computer communications among LANs, MANs, andand identify various sending WANs and receiving devices Differentiate between client/server and peer-to- Differentiate among a star Describe the various peer networks, and network, bus network, and network communications describe how a P2P ring network standards network worksSee Page 459 Discovering Computers 2010: Living in a Digital World 2for Detailed Objectives Chapter 9
  • 3. Objectives Overview Describe various types Explain the purpose of Describe commonly of lines for communications used communications communications over software devices the telephone network Discuss different ways Describe various to set up a home physical and wireless network transmission mediaSee Page 459 Discovering Computers 2010: Living in a Digital World 3for Detailed Objectives Chapter 9
  • 4. Communications• Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Communications Sending device Receiving device channelPage 460 Discovering Computers 2010: Living in a Digital World 4 Chapter 9
  • 5. CommunicationsPages 460 – 461 Discovering Computers 2010: Living in a Digital World 5Figure 9-1 Chapter 9
  • 6. Uses of Computer Communications Blogs Chat rooms E-mail Fax Instant FTP Internet Newsgroups messaging Video RSS VoIP Web conferencing Click to view Web Link, click Chapter 9, Click Web Web 2.0 Web folders Wikis Link from left navigation, then click Wikis below Chapter 9Page 462 Discovering Computers 2010: Living in a Digital World 6 Chapter 9
  • 7. Uses of Computer Communications• Users can send and receive wireless messages using wireless messaging servicesPages 462 – 463 Discovering Computers 2010: Living in a Digital World 7Figure 9-3 Chapter 9
  • 8. Uses of Computer CommunicationsText messaging allows users to send and receive short text messages on aphone or other mobile device or computerPicture messaging allows users to send pictures and sound filesVideo messaging allows users to send short video clipsWireless instant messaging allows wireless users to exchange real-timemessages with one or more other users Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Video Messaging below Chapter 9Pages 463 - 464 Discovering Computers 2010: Living in a Digital World 8 Chapter 9
  • 9. Uses of Computer Communications• Wireless Internet access points allow people to connect wirelessly to the Internet from home, work, school, and in many public locationsPages 464 – 465 Discovering Computers 2010: Living in a Digital World 9Figure 9-4 Chapter 9
  • 10. Uses of Computer Communications• A cybercafé is a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customersPage 466 Discovering Computers 2010: Living in a Digital World 10Figure 9-5 Chapter 9
  • 11. Uses of Computer Communications• A global positioning system (GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location• GPS receivers are: Built into Available as a Available with many mobile handheld new vehicles devices device Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click GPS below Chapter 9Page 466 Discovering Computers 2010: Living in a Digital World 11 Chapter 9
  • 12. Uses of Computer CommunicationsPage 467 Discovering Computers 2010: Living in a Digital World 12Figure 9-6 Chapter 9
  • 13. Uses of Computer Communications Groupware Voice mail• Helps groups of people work • Allows someone to leave a together on projects and voice message for one or share information over a more people network • Computer in voice mail• Component of workgroup system converts an analog computing voice message into digital• Major feature is group form scheduling • A voice mailbox is a storage location on a hard disk in the voice mail systemPage 467 Discovering Computers 2010: Living in a Digital World 13 Chapter 9
  • 14. Uses of Computer Communications• Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Online Web meetings conferences Document Click to view Web Link, management click Chapter 9, Click Web Link from left navigation, then click Microsoft Groove systems below Chapter 9Page 468 Discovering Computers 2010: Living in a Digital World 14 Chapter 9
  • 15. Uses of Computer CommunicationsPage 468 Discovering Computers 2010: Living in a Digital World 15Figure 9-7 Chapter 9
  • 16. Networks• A network is a collection of computers and devices connected together via communications devices and transmission media• Advantages of a network include: Facilitating Sharing Sharing data communications hardware and information Sharing Transferring software fundsPages 470 - 471 Discovering Computers 2010: Living in a Digital World 16 Chapter 9
  • 17. NetworksPage 470 Discovering Computers 2010: Living in a Digital World 17Figure 9-9 Chapter 9
  • 18. Networks • A local area network (LAN) is a network that connects computers and devices in a limited geographical area • A wireless LAN (WLAN) is a LAN that uses no physical wiresPage 472 Discovering Computers 2010: Living in a Digital World 18Figures 9-10 – 9-11 Chapter 9
  • 19. Networks• A metropolitan area network (MAN) connects LANs in a metropolitan area• A wide area network (WAN) is a network that covers a large geographical areaPage 473 Discovering Computers 2010: Living in a Digital World 19Figure 9-12 Chapter 9
  • 20. Networks• The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer networkPages 473 – 474 Discovering Computers 2010: Living in a Digital World 20Figures 9-13 – 9-14 Chapter 9
  • 21. Networks• P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click P2P below Chapter 9Page 475 Discovering Computers 2010: Living in a Digital World 21Figure 9-15 Chapter 9
  • 22. Networks• A network topology refers to the layout of the computers and devices in a communications network Star network Bus network Ring networkPages 475 – 477 Discovering Computers 2010: Living in a Digital World 22Figures 9-16 – 9-18 Chapter 9
  • 23. Networks An intranet is an An extranet allows internal network customers or that uses Internet suppliers to access technologies part of its intranetPage 477 Discovering Computers 2010: Living in a Digital World 23 Chapter 9
  • 24. Network Communications Standards Token Ethernet TCP/IP Wi-Fi ringBluetooth UWB IrDA RFID WiMAX WAPPage 477 Discovering Computers 2010: Living in a Digital World 24 Chapter 9
  • 25. Network Communications StandardsEthernet is a network standard that specifies no computercontrols when data can be transmittedThe token ring standard specifies that computers anddevices on the network share or pass a special signal (token)TCP/IP is a network standard that defines how messages arerouted from one end of a network to another Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Ethernet below Chapter 9Page 478 Discovering Computers 2010: Living in a Digital World 25 Chapter 9
  • 26. Network Communications StandardsPage 479 Discovering Computers 2010: Living in a Digital World 26Figure 9-19 Chapter 9
  • 27. Network Communications Standards • Wi-Fi identifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless EthernetPage 479 Discovering Computers 2010: Living in a Digital World 27Figure 9-20 Chapter 9
  • 28. Network Communications Standards• Bluetooth defines how two Bluetooth devices use short- range radio waves to transmit data• UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds• IrDA transmits data wirelessly via infrared (IR) light waves• RFID uses radio signals to communicate with a tag placed in or attached to an object, animal, or person Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click RFID below Chapter 9Pages 480 - 481 Discovering Computers 2010: Living in a Digital World 28 Chapter 9
  • 29. Network Communications StandardsPage 481 Discovering Computers 2010: Living in a Digital World 29Figure 9-21 Chapter 9
  • 30. Communications Software• Communications software consists of programs that: Help users establish Manage the a connection to transmission of another computer data, instructions, or network and information Provide an interface for users to communicate with one anotherPage 482 Discovering Computers 2010: Living in a Digital World 30 Chapter 9
  • 31. Communications Overthe Telephone Network• The public switched telephone network (PSTN) is the worldwide telephone systemPages 482 – 483 Discovering Computers 2010: Living in a Digital World 31Figure 9-23 Chapter 9
  • 32. Communications Overthe Telephone Network Dial-up Dedicated ISDN line lines line T-carrier DSL FTTP line Click to view Web Link, click Chapter 9, Click Web ATM Link from left navigation, then click DSL below Chapter 9Pages 483 - 485 Discovering Computers 2010: Living in a Digital World 32 Chapter 9
  • 33. Communications Overthe Telephone NetworkPage 483 Discovering Computers 2010: Living in a Digital World 33Figure 9-24 Chapter 9
  • 34. Communications Overthe Telephone Network• ADSL connections transmit data downstream at a much faster rate than upstreamPage 484 Discovering Computers 2010: Living in a Digital World 34Figure 9-25 Chapter 9
  • 35. Communications Devices• A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device• A dial-up modem converts signals between analog and digitalPage 485 Discovering Computers 2010: Living in a Digital World 35 Chapter 9
  • 36. Communications Devices• A digital modem sends and receives data and information to and from a digital line DSL Cable modem modem Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Cable Modems below Chapter 9Page 486 Discovering Computers 2010: Living in a Digital World 36 Chapter 9
  • 37. Communications DevicesPage 486 Discovering Computers 2010: Living in a Digital World 37Figures 9-26 – 9-27 Chapter 9
  • 38. Communications Devices• A wireless modem uses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile devicePage 487 Discovering Computers 2010: Living in a Digital World 38Figure 9-28 Chapter 9
  • 39. Communications Devices • A network card enables a computer or device to access a network • Available in a variety of styles • Wireless network cards often have an antennaPage 487 Discovering Computers 2010: Living in a Digital World 39Figure 9-29 Chapter 9
  • 40. Communications Devices• A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired networkPage 487 Discovering Computers 2010: Living in a Digital World 40Figure 9-30 Chapter 9
  • 41. Communications Devices • A router connects multiple computers or other routers together and transmits data to its correct destination on a network • Many are protected by a hardware firewall Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Wireless Routers below Chapter 9Page 488 Discovering Computers 2010: Living in a Digital World 41Figure 9-31 Chapter 9
  • 42. Communications Devices• A hub or switch connects several devices in a network togetherPages 488 – 489 Discovering Computers 2010: Living in a Digital World 42Figure 9-32 Chapter 9
  • 43. Home Networks• Home networks provide computers with the following capabilities: Connect to the Share a single high- Access files and Internet at the speed Internet programs on other Share peripherals same time connection computers Connect game Play multiplayer Subscribe to and consoles to the games use VoIP Internet Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Home Networks below Chapter 9Page 489 Discovering Computers 2010: Living in a Digital World 43 Chapter 9
  • 44. Home Networks• Types of wired home networks: Ethernet Powerline cable PhonelinePage 489 Discovering Computers 2010: Living in a Digital World 44 Chapter 9
  • 45. Home NetworksPage 490 Discovering Computers 2010: Living in a Digital World 45Figure 9-33 Chapter 9
  • 46. Communications Channel • The amount of data that can travel over a communications channel sometimes is called the bandwidth • Latency is the time it takes a signal to travel from one location to another on a network • Transmission media carries one or more signals • Broadband media transmit multiple signals simultaneouslyPage 491 Discovering Computers 2010: Living in a Digital World 46Figure 9-34 Chapter 9
  • 47. Physical Transmission MediaPage 492 Discovering Computers 2010: Living in a Digital World 47Figure 9-35 Chapter 9
  • 48. Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cablePage 493 Discovering Computers 2010: Living in a Digital World 48Figures 9-36 – 9-38 Chapter 9
  • 49. Wireless Transmission MediaPage 494 Discovering Computers 2010: Living in a Digital World 49Figure 9-39 Chapter 9
  • 50. Wireless Transmission Media• Cellular radio is a form of broadcast radio that is used widely for mobile communications Click to view Web Link, click Chapter 9, Click Web Link from left navigation, then click Mobile TV below Chapter 9Page 495 Discovering Computers 2010: Living in a Digital World 50Figure 9-40 Chapter 9
  • 51. Wireless Transmission Media• Microwaves are radio waves that provide a high- speed signal transmissionPage 496 Discovering Computers 2010: Living in a Digital World 51Figure 9-41 Chapter 9
  • 52. Wireless Transmission Media • A communications satellite is a space station that receives microwave signals from an earth-based station, amplifies it, and broadcasts the signal over a wide areaPage 496 Discovering Computers 2010: Living in a Digital World 52Figure 9-42 Chapter 9
  • 53. Video: Got Your Video Right Here CLICK TO START Discovering Computers 2010: Living in a Digital World 53 Chapter 9
  • 54. Summary Overview of How to join communications computers into a terminology and network applications Various communications devices, media, and proceduresPage 497 Discovering Computers 2010: Living in a Digital World 54 Chapter 9
  • 55. Discovering THANK YOU Computers 2010 Living in a Digital World Chapter 9 Complete