Network Topology And Network Media

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Network Topology And Network Media
???????????????????? IEEE 8021. IEEE 802.3
Ethernet ?????????????????? CSMA/CD
(Carrier Sense Multiple Access with
Collision Detection Protocol)2. IEEE 802.4
?????????????????? Token Bus3. IEEE 802.5
?????????????????? Token Ring FDDI Fiber
Distributed Data Interface
2
Ethernet
1. IEEE 802.3 Ethernet ??????????????????
CSMA/CD(Carrier Sense Multiple Access with
Collision Detection Protocol)
Detect and Sent
Media UTP , Thick Coax , Fiber Optic
3
Token Bus
1. IEEE 802.4 ?????????????????? Token Bus
Coaxial Cable
Direction for token motion
Media Coax 10 BASE2 50 Ohm , UTP
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Token Ring
1. IEEE 802.5 ?????????????????? Token Ring
(FDDI)
Media Fiber Optic
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???????????????? Wire Media
UTP Unshielded Twisted Pair
CAT1 (Category 1) CAT2 CAT3 16 MHz CAT4 20
MHz CAT5 100 MHz 100MCAT5e 1000 MHZ 1000M
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???????????????? Wire Media
UTP Unshielded Twisted Pair
10BASE-T100BASE-TX
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???????????????? Wire Media
STP Shielded Twisted Pair
???????????????????? UTP
8
???????????????? Wire Media
10BASE2 Thin Coax 185 M 10 MBPS
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???????????????? Wire Media
10BASE5 Thick Coax
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???????????????? Wire Media
100BASE-FX 1000BASE-SX-LXFiber Optic
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???????????????? Wire Media
Fiber Optic Cabling
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???????????????? Wire Media
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???????????????? Wire Media

• 10BASE2 and 10BASE5 Coaxial technologies
• 10BASE-T 100BASE-TX UTP technologies 1000BASE-T
  (Gigabit Ethernet over UTP)
• 1000BASE-SX (Gigabit Ethernet over optical fiber
  with short-wavelength laser source), and
  1000BASE-LX (Gigabit Ethernet over optical fiber
  with long-wavelength laser source).

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??????????????????? Wireless
??????? IEEE 802.11 ???????????????????? CSMA/CA
with Acknowledgement ?????????????????????????????
???????? Acknowledgement ?????????????????????????
???????????? Acknowledgement ????????????????????
??????????????????????????????????????????????????
???????????????????
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??????????????????? Wireless
IEEE 802.11b ??????????? IEEE 802.11b
???????????????????????????????????? ?.?. 2542
??????????????????????????????????????????????????
?????? ??????? IEEE 802.11b ????????????????? 11
Mbps ????????????????????? 2.4 GHz ISM
(Industrial Scientific and Medical)
IEEE 802.11a ??????????? IEEE 802.11a
???????????????????????????????????? ?.?. 2542
??????? IEEE 802.11a ????????????????? 54 Mbps
???????????????????????????? 5 GHz
??????????????????????????????????????????????????
??????????????????????????????????????????????????
????????? 2.4 GHz ????????????????????????????????
?? IEEE 802.11a ?????????????????????????? 5 GHz
??????????????????????????????????????????????????
??????????????????? ????????????
??????????????????????????????????????? IEEE
802.11a ???????????????????? 5 GHz
????????????????????????????????????????
??????????????????????????????????????? IEEE
802.11a WLAN ?????????????????????????????????????
(?????? 30 ???? ?????????????????????????????????
IEEE 802.11b WLAN ??????????????? 100 ????
?????????????????????????) ?????????????? IEEE
802.11a WLAN ???????????????? IEEE 802.11b WLAN
???? ?????????????? IEEE 802.11a WLAN
????????????????????????? IEEE 802.11b WLAN ???
16
??????????????????? Wireless
IEEE 802.11g ??????????? IEEE 802.11g
??????????????????????????? 2.4 GHz ???????????
IEEE 802.11g WLAN ????????????????????????????????
?????????????????? 54 Mbps ???????????????????????
?? IEEE 802.11g WLAN ?????????????????????????????
????? IEEE 802.11a ??? IEEE 802.11b
???????????????? 2.4 GHz ?????????????????????????
? ?????????????? IEEE 802.11g WLAN
????????????????????????? IEEE 802.11b WLAN ???
(backward-compatible) ????????????????????????????
???? IEEE 802.11g WLAN ???????????????????????????
????????????????????????????????????????? IEEE
802.11b ???????? ???????????????????? IEEE
802.11g ?????????????????????????????????? ?.?.
2546
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??????????????????? Wireless
Access Point
PCMCIA and PCI Wireless Card
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??????????????????? WiMAX
WiMAX ??????? WiMAX ??????????????????????????????
??????????????????????????????????????????????????
?????????? ??? WiMAX ?????????????? Worldwide
Interoperability for Microwave Access
??????????????????????????????????????????????????
??????????????????????????? IEEE 802.16
?????????????????????????? IEEE 802.16a ????
?????????????????????????????????? 2004
??????????????????????????????????????? ???? IEEE
(Institute of Electrical and Electronics
Engineers) ??????????????????? 30 ????
????????????????????? 48 ????????
??????????????????? WiMAX ????????????????????????
?????????????????????????????????????????????????
3G ?????? 10 ???? ????????????????????????????????
??????????????????????????? 75 ????????????????
(Mbps) ???????????? 3G ??? 30 ???????????
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??????? Reference
-Training CD ,Cisco Networking Academy program
(CCNA)-??????? IEEE 802.11 WLAN ????????????????
???????? ??????????????? ??????? ,??.
???????? ??????????? , ??????? 2546 ,
http//thaicert.nectec.or.th/paper/wireless.php