????????????? 4 ???????????????????????? Computer Network

1
????????????? 4????????????????????????Computer
Network
???????????????????????????? Use of Computer in
Business BUA 1107
2
????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????????????????????????????
  
• ??????????????????????????
• ???????????????????????????
• ????????????????????????
• ????????????????????????????????

3
??????????????????????????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ???????????????? (Data Communications)
• ?????????????????????????????????????????????????
  ????????????
• ?????????????????? ???? ?????????????????????
  ????????????????????????????????????????
• ??????????????????????????????????????????

4
??????????????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107
5
??????????????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107
????????????????????????????????????????????????
6
??????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????????????????????? (Sender)
• ?????????????????????????? (Receiver)
• ??????? (Message)
• ??????? (Medium)
• ???????? (Protocol)
• ????????? (Software)

• ?????? (Data)
• ??????? (Text)
• ?????? (Image)
• ????? (Voice)

7
???????????????????????????? Use of Computer in
Business BUA 1107
??????????????????????? ?????????? ????????????
4 ?????? ???
1 ????????? (Sender) ??? ????????????????????????
????????????????????
2 ????????? (Receiver)??? ???????????????????????
????????????????????????
3 ??? (Message) ??? ????????? ???????????????????
???????????
4 ???? (Channel) ??? ??????????????????? ????
???????????????????????????? ????????????????????
?????????????????
8
???????????????????????????? Use of Computer in
Business BUA 1107
???????????????????? ????????????????????????????
???????
?????????????????? (Communication Model)
????
???
???
?????????
?????????
9
?????????????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????? (Transmission Rate)
• ??????? ?????????????????????????????????
• ?????????? ??????????????????????????????
  ??????????????? ????????????????

10
?????????????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ????????????????????? ????????????????????????????
  ??? ????????????????????????????????????????
• ???????????????????????
• ?????????????????????? ???????????????????????????
  ?? ??????????? ???????????????????????????????????
  ? ?????????? ????????????? ???????

11
?????????????????? Media Communication (Medium)
???????????????????????????? Use of Computer in
Business BUA 1107
12
???????????????????????? (Transmission Media)
???????????????????????????? Use of Computer in
Business BUA 1107

• ???????????????? (Physical path)
  ????????????????????? (Transmitter) ??? ??????
  (Receiver) ??????????????????????????????????????
  2 ??????
• Guided Media or Wired ?????????????
  /????????????
• ???????????????????????? ???????????????????????
  ???? ????????? ?????????????????? (fiber optic
  cable)

13
???????????????????????? (Transmission Media)
???????????????????????????? Use of Computer in
Business BUA 1107

• Unguided media or Wireless ?????????????
• ????????????????????? ?????????????????????
  ?????????????? ????????????? ?????????????????????
  ????????????????????????????????

14
?????????????????????????? (Guided Transmission
Media)
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????? (Twisted-Pair Cable)
• ????????????? (Coaxial Cable)
• ???????????????? (Fiber Optic Cable)

15
??????????????? (Twisted-Pair Cable)
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????????????????????????????????????? 4
  ??????????????????????????????????????????????????
  ???????
• ??????????????????????????????????????????????????
  ???????????????????????????????????????????
• ????????????????????????????????????? 100 Hz 5
  MHz

16
?????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107
17
????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107
Shielded Twisted-Pair (STP)
Unshielded Twisted-Pair (UTP)
18
?????? twisted pair
???????????????????????????? Use of Computer in
Business BUA 1107
19
???????????????????????????? Use of Computer in
Business BUA 1107
???????????????????????

• ????????????????????????
• ??????????
• ???????????

20
???????????????????????????? Use of Computer in
Business BUA 1107
?????????????????????????

• ??????????????????????????????????
  ????????????????????????????????????
• ???????????????????????
• ?????????????? ??????????????????????????????
  (repeater) ???? 5-6 ??.
• ????????????? ??????????????????????????????
  ???? 2-3 ??.
• ???????????????????????????????????????????????
  (3000Hz)
• skin effect ??????????????????????????????????????
  ??????????

21
????????????? (Coaxial Cable)
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????? ( ????? ) ???? ???????? 2
  ??????????????????????????????????
  ??????????????????????? ???????????????

22
????? ?????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????(???)????????????????????????????
  (???????????????????????)
• ??????????????????????????????????????????????????
  ?????????? ???????????????

??????? ?????????????

• ??????????????????????????????????????????????????
  ?
• ?????????????(????????????????????????????)
• ??????????????????????????????????????
  ??????????????????????????? ?????????????????????

23
???????????????? (Fiber Optic Cable)
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????????????????????????????
  ?? ???????????????????????????????????????????
  ???????????????????
• ??????????????????????????????????????????????????
  ????????
• ???????????????????????????????????????????
  injection laser diode (ILD) ???? light-emitting
  diode (LED)

24
???????????????? (Fiber Optic Cable)
???????????????????????????? Use of Computer in
Business BUA 1107
25
????????? ????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????????????????
• ??????? bandwidth ?????????????????????????????
  ??????
• ???????????????????????????????????????
• ????????? 100 Mb/s ??????
• ????????????? 6000 ??. , 3700 ????

26
????????? ????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ????????????? 6000 ??. , 3700 ????
• ???????????????????????????
• ?????????? ?????????????????
• ??????????????????????????????????
• ????????????????????????? LED (light emitting
  diode),ILD
• ????????????????????????????? photo diode
• ??????????????????

27
???????????????????????????? Use of Computer in
Business BUA 1107

• ???????????????? 2 ???? glass core , glass
  cladding ??????????????????????
• ??????????????? glass core ?? 3
  ???????????????????????????????????????????

28
Mode ???????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• Multimode stepped index
• - Cladding core ??????????????????????????????
  ???????????
• - ?????????????????????????????????
• - ???????????????????????
• - ??? LED ????????????????????????

29
Mode ???????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• Multimode graded index
• - ???????????????????????
• - ???????????????? multimode
• Mono mode fiber
• - ??????????????????????????????????
• - ?????????? ILD diode

30
Mode ???????????????
???????????????????????????? Use of Computer in
Business BUA 1107
31
????? ?????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????(??????)?????????????
  ???????????????????????????? 2 Mbps
• ???????????????????????
• ??????????????????????
• ?????????????????????????????????????????????
• ???????????????????????????? ?????????????
  ??????????????????????????????????

32
??????? ?????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ????????? ??????????????????????
• ????????????????????????????????????????
• ???????????????????????? ????????

33
????????????????????????? (Wireless Transmission)
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????????????? ????????
  antenna ????
• ????????????????????? 2 ???
• Directional - ??????????????
• ?????????????????? antenna ???????????????????????
  ???????????????????????
• ?????????????????????? ???????????????????????????
  ??

34
????????????????????????? (Wireless Transmission)
???????????????????????????? Use of Computer in
Business BUA 1107

• Omnidirectional - ?????????????????
• ???????????????????????????????
• ??????????????????????????????? antenna
  ?????????????

35
Wireless Communication band
???????????????????????????? Use of Computer in
Business BUA 1107
36
??????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• Broadcast radio
• Cellular Radio-Mobile telephone
• Terrestrial Microwave
• Satellite Communication
• Infrared

37
Broadcast radio
???????????????????????????? Use of Computer in
Business BUA 1107

• ???????????????? omni-directional ??????
  broadcast ?????????????????
• ??????? 30 MHz-1GHz
• ???????????????????????? data rate ???
• ????????????????????????????????

38
Cellular Radio-Mobile telephone
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????? narrow microwave
• ??????????????? microwave band 900 MHz
• ???????????? point to point ??????????? 10-50Kbps
• ???????? cell ????????????????????????????
  bandwidth ?????
• ??????? cell ?????????????????????????????????????
  ?
• ????? cell ??????????????????????

39
Terrestrial Microwave
???????????????????????????? Use of Computer in
Business BUA 1107

• ????????????????????????????????????????????????-?
  ????????
• ?????????????????????????????????????-?????????
  ???????????????????????????????????????????? 40
  ??. ?????????????????????????????????????
  ???????????????????????????????????

40
Terrestrial Microwave
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????????????????????????????????????? 2 to
  40 Ghz
• ?????????????????????????????????????
  ??????????????????????????????????????
• ????????????????????????????????????? (private
  network) ???? LAN

41
????? ????????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ????????????????????
• ?????????????????????????
• ???????????????????????????????????
  (multi-channel transmissions)

42
???????????????????????????? Use of Computer in
Business BUA 1107
??????? ????????????????????????????

• ????????????????????????-??? ?????? ?????????????
• ??????????????????????????????????????????????????
  ??????
• ?????????????????????????? ???????????????????????
  ????????????????????????????, ????????????????????
  ???????????

43
Satellite Communication
???????????????????????????? Use of Computer in
Business BUA 1107

• ???????????????????????
• ?????????? line of sight
• ?????? Geostationary ??? Low-earth orbit
• Geostationary satellite ??????????????????????????
  ?????? ????????????? 35000 Kms ???????????????????
  ??

44
Satellite Communication
???????????????????????????? Use of Computer in
Business BUA 1107

• Low-earth orbit ???????????????????????? 1,000
  ??. ??????????????????? ?????????????????,
  ??????? ??????????????????????????????????????????
  ??????????? ?????????????????????????????????
  ??????????????????????????????????????????????????
  ?????? ???????????????????????????????????????????
  ???????????? (Polar Orbit) ???????????????????????
  ??????????????????????????????????????????????????
  ??????????? ?????????????????????????

45
???????????????????????????? Use of Computer in
Business BUA 1107
46
?????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ??????????????????????????????????????
• ??????????????????????????????
  ?????????????????????????????????????
• ???????????????????????????????????????????????
  (direct broadcast satellite DBS)

47
?????????????????
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????????????? (long-distance telephone
  transmission)
• ???????????????????????????? ?????????????????
• ????????????????????????????????????????????????
• ??????????????? broadcast , two-way communication

48
???????????????????????????? Use of Computer in
Business BUA 1107
49
???????????????????????????? Use of Computer in
Business BUA 1107
?????????????????????????????????

• ??????????????????????????????????????????????????
  ?
• ???????????????????????????????
• ????????????????????? ????????????????????????
  ???????

50
???????????????????????????? Use of Computer in
Business BUA 1107
?????????????????????????????????

• ??????????????????????? (Installation Cost)
• ??????????????????????????????? ????
  ??????????????????????????????
• ????????????(????) ????????????????? (Propagation
  Delay)

51
Infrared
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????? infrared ?????????????????? LED ????????
• ????????????????????? microwave
  ????????????????????????
• Data rate 1 Mbps ???? 30 m
• ???????????????????????????

52
Infrared
???????????????????????????? Use of Computer in
Business BUA 1107

• ?????????????? artificial ?????
• ?????? 2 ???
• - directed ??????????????????? 2 ???
• - diffuse ?????????????????????????????????????
  ??????????????????????????

53
???????????????????????????
???????????????????????????? Use of Computer in
Business BUA 1107
????????????? ????????? jinny_asavarat_at_hotmail.co
m http//www.learners.in.t
h/blog/ajarnkai
54
???????????????????????????? Use of Computer in
Business BUA 1107
?????????????????????????????
?????????? ??????????????????
Internetworking ???? Internet ???????????????????
??????? ????????????????????? ??????
1. ???????????????? ????????????????????????????
Packet ???? ???? TCP Packet , UDP Packet
???????
2. ????? Packet ???????????? (Label)
3. ????????????????? Packet ????????????
??????????????? ???????? Packet ????????
55
???????????????????????????? Use of Computer in
Business BUA 1107
????????????????????????????? (???)
4. ????????????????? Packet ???????????? ???
Packet ?????????? ???? ???????? Router
???????????????????????????????? Packet
5. ?????? Router ???? Proxy ????????????????????
??????? ??????????????????????????????????
? ????????????????
6. ??????????????? Packet ????????????????
???????????? ????????????????????????????????
????????????? ????????????
??????????????????? ?????????????????????????
56
???????????????????????????? Use of Computer in
Business BUA 1107
????????????????????????????? (???)
7. ???????????????????????????????????????????
????? Router ?????????????????????????????
????????????????????????? ???????? Firewall
????????????????????? Hardware ??? Software
??????????????????????????????????????????????????
?????
8. ?????????????????????????? Port
??????????????????????? Web Browser ???
One-by-One
9. ???????????????????????????? ?????????????
Packet ??? ???????????????????????????????
??? Web Browser
57
???????????????????????????? Use of Computer in
Business BUA 1107
?????????????????????????
????????????????????? (Simplex Communication)
??????????????????????????????????
??????? ??????????????????????????????????????????
???????????????????????????????????????
?????????????????? ???? ????? ???????? ??????
???????? ??????? ???
58
???????????????????????????? Use of Computer in
Business BUA 1107
??????????????????????? (Half Duplex
Communication)
??????????????????
???????? ???????????????????????????????????
????????????????? ????????? ????
???????????????? ???????
59
???????????????????????????? Use of Computer in
Business BUA 1107
??????????????????? (Full Duplex Communication)

??????????????????????????? ?????????????????????
????? ???????????? ?????? ???????????????? ????
???????????? ????????????? ???????
60
???????????????????????????? Use of Computer in
Business BUA 1107
????????????????????????????? (???????????????????
???????)
???????????????????????????????? (Local Area
Network LAN) ??????????????????????????????
???????????????????? ????????????????????????????
???????????????????? ???? ????????????????????????
?? ????????????????????????????????
??????????????????????????????????? ???
61
???????????????????????????? Use of Computer in
Business BUA 1107
????????????????????? (Metropolitan Area Network
MAN) ???????????????????????????
???????????????????????? LAN ????
???????????????????????????????????????? ???????
62
???????????????????????????? Use of Computer in
Business BUA 1107
???????????????????? (Wide Area Network
WAN) ????????????????????????????????????????
????????????????????????????????
??????????? ?????????????????????????
????????????????? ???? ???????????????? ???????
63
?????????????????? LAN ,MAN ,WAN
64
???????????????????????????? Use of Computer in
Business BUA 1107
??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET ??????????????????? ETHERNET
??????? ???????????? ????????????? ??????-??? ?????? ??????????? ????????-??? ?????? Topology ?????? ????????? Cable ?????????
10base2 10 Mbps 185 - 200 ???? BUS Thin Coaxial Thin Ethernet ???? Cheapernet
10base5 10 Mbps 500 ???? Thick Coaxial Thick Ethernet
10baseT 10 Mbps 100 ???? STAR Twisted Pair (UTP)
10baseF 10 Mbps 2000 ???? Fiber Optic
100baseT 100 Mbps ......... ???? Twisted Pair (UTP) Fast Ethernet