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Chapter 3

Chapter 3. Communication Technology. Computer Network.

mariko-phillips
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Chapter 3

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  1. Chapter 3 CommunicationTechnology

  2. Computer Network … is a telecommunications network that allows computers to exchange data. In computer networks, networked computing devices pass data to each other along data connections. The connections (network links) between nodes are established using either cable media or wireless media. The best-known computer network is the Internet.

  3. Network Element

  4. Network element • Sender– devices or sources send data/information • Data- message which was sent from sender to receiver • Receiver– destination of data/information • Media– the way used for passing the data/information • Protocol- the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries.

  5. Devices for Network • Computer • Network Interface Card (NIC) • Physical Media – Twist pair , Coaxial , Fiber optic, Wireless • Protocol – TCP/IP • Network Operating System (NOS)

  6. Benefits of Network • Sharing resource • Reducedcost • Comfortable • Safety for system

  7. Type of DataCommunication • Unicast … communication where a piece of information is sent from one point to another point. In this case there is just one sender, and one receiver.Or called One-to-One

  8. 2. Broadcast … communication where a piece of information is sent from one point to all other points. In this case there is just one sender, but the information is sent to all connected receivers. Or called One-to-All

  9. 3. Multicast … communication where a piece of information is sent from one or more points to a set of other points. In this case there is may be one or more senders, and the information is distributed to a set of receivers.

  10. Communication Direction • Simplex • Half-Duplex • Full-Duplex

  11. Communication Direction • Simplex communication that occurs in one direction only. An example of a simplex device is a television, radio, satellite etc.

  12. Communication Direction 2. Half-Duplex the communication is one direction at a time. An example of a half-duplex device is a walkie-talkie two-way radio that has a "push-to-talk" button

  13. Communication Direction 3. Full-Duplex both parties can communicate to the other simultaneously. An example of a full-duplex device is a telephone

  14. Type of Network • by flow of data • by function of computer • by size of service

  15. flow of data • Centralized Network

  16. flow of data • Distributed Network

  17. Function of Comp. Peer to Peer OR Workgroup Client Server

  18. Size of Network • LAN , MAN , WAN

  19. … is a network confined to one building or site. Often a LAN is a private network belonging to an organization or business.

  20. … is a network that extends over a large area. A WAN is often created by joining several LANs together, such as when a business that has offices in different countries links the office LANs together.

  21. Networking StandardWire • LANs are most likely based on Ethernet technology, Token Ring, FDDI ๐ What’s Ethernet ??? … is a family of computer networking technologies for LANs. The original 10 megabits per second used twisted pair. Later the coaxial cables were replaced with twisted pair, data rates were periodically increased from the original 10 megabits per second to 100 gigabits per second.

  22. 1.2 Token-Ring … is a protocol which resides at the data link layer (DLL) of the OSI model. It used a special three-byte frame called a token that travels around the ring. Token-possession grants the possessor permission to transmit on the medium. Token ring frames travel completely around the loop. It was eventually standardized with protocol IEEE 802.5

  23. 1.3 FDDI (Fiber Distributed Data Interface) … is a standard for data transmission in a local area network. It uses optical fiber as its standard underlying physical medium. It’s protocol was derived from the IEEE 802.4 token bus

  24. Wireless … is any type of computer network that uses wireless data connections for connecting network nodes, or as a connection between various equipment locations.

  25. Type of Wireless • WPAN (wireless personal area network) • WLAN (wireless local area network) • WMAN (wireless metropolitan area network) • WWAN (wireless wide area network)

  26. WPAN … is a computer network used for wireless data transmission among devices such as computers, telephones and personal digital assistants such asIR (Infra-Red) , Bluetooth, NFC

  27. 2. WLAN is a LAN that uses radio signals (WiFi) to connect computers instead of cables.

  28. 3. WMAN … is optimized for a larger geographical area than a LAN, ranging from several blocks of buildings to entire cities. It has been commercialized under the name "WiMAX"

  29. 4. WWAN … is a form of wireless network, requires differences in technology. Wireless networks of all sizes deliver data in the form of telephone calls, web pages, and streaming video.

  30. Networking StandardWireless • IEEE802.11 • IEEE802.11a • IEEE802.11b • IEEE802.11g • IEEE802.11n

  31. 1. IEEE802.11 …is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN). It specified two net bit rates of 1 or 2 megabits per second (Mbit/s)

  32. 2. IEEE802.11a … allow transmission and reception of data at rates of 1.5 to 54Mbit/s. It operates in the 5 GHz band, so that its not allow using in Thailand.

  33. 3. IEEE802.11b The 802.11b standard has a maximum raw data rate of 11 Mbit/s. Devices operating in the 2.4 GHz range include microwave ovens, Bluetooth devices, baby monitors, cordless telephones and some amateur radio equipment.

  34. 4. IEEE802.11g Like 802.11b, 802.11g devices suffer interference from other products operating in the 2.4 GHz band, for example wireless keyboards.

  35. 5. IEEE802.11n 802.11n is an amendment which improves upon the previous 802.11 standards by adding multiple-input multiple-output antennas (MIMO). It operates at a maximum net data rate from 54 Mbit/s to 600 Mbit/s.

  36. Effective Criteria • Competency • Reliability • Security

  37. Competency) 1.1 time for data transfers 1.2 amount of user in network 1.3 type of media 1.4 Devices

  38. 2. Reliability 2.1 The frequency of failure in data transmission 2.2 The duration of the recovery or system recovery in case of failure. 2.3 Prevention to the system failure.

  39. 3. Security 3.1 Right of access to information 3.2 Threat Protection – Virus computer

  40. Benefit of Network 1. Communication 1.1 E-board 1.2 E-mail 1.3 E-conference 1.4 Online conversation – Cha etc.

  41. 2. Data searching … to search for data or information on the WWW, which result of searching be Text, Image, Sound, or Multimedia.

  42. 3. Business 3.1 Electronic data exchange 3.2 Electronic funds transfer 3.3 Electronic commerce

  43. 4. Education E-learning | E-media | distance learning | blended learning | M-learning 5. Medical Telemedicine | Video telephony | Telenursing| Telepharmacy| Telesurgery | Health information technology

  44. Telemedicine

  45. SDU : IT Services 1. SDU Web Hosting Service

  46. SDU : IT Services 2. Identity Manager | IDM

  47. 3. SDU Kiosk SDU : IT Services

  48. SDU : IT Services 4. SDU mail https://sdumail.dusit.ac.th/

  49. SDU : IT Services 5. SDU WIFI ๐ Dusit ๐Dusit Guest ๐Dusit Secure

  50. SDU WIFI

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