Ͳ Dz
泔
6.0915
2004
̲
.............................................................................................................4
1 Ͳ LAN-ò.......................................5
1.1 㳿...............................................................................5
1.2 ................................................................................7
1.3 ..............................................................9
2 Ҳ ί ò ETHERNET............ 17
2.1 㳿 Ethernet 17
2.2 CSMA/CD 20
2.3 Ethernet 10 Base..23
2.4 Fast Ethernet ..29
3 ֲ ί Ҳ ϒί
Ʋ................................................................................................ 36
3.1 Ethernet...............................................................36
3.2 Fast Ethernet.....................................................40
4 ί ........................44
5 в ...........................................................................49
㳿, , .
, - , ( ) , , ', ', , , , , , , CD-ROM .. ' .
, , .
LAN (Local Area Network) : - CAN (Campus Area Network) , , , - MAN (Metropolitan Area Network) , - WAN (Wide Area Network) , - GAN (Global Area Network) , , Internet.
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- , .
' ' , , -, , , . , . , .
. , . : , , , , , , . , , , ' .
Ethernet.
1. Ͳ LAN-ò
1.1 㳿
' . (). Ethernet . 㳺 10 Ethernet (10Base-2 10Base-5). . , ' . , , ( ). ³ . ' .
' , . .
' - (repeaters) .
100 Ethernet .
' ( ) , , (Hub), (Repeater), (Switch) (Bridge).
, . , , ', . , , . ( ) . : , , 瑺 .. "" 㳺 . .
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100 1000 Ethernet 㳺 "".
. ' ( ) ' . , , , , . , . . , ( , ), 糿 . , ', , . . , . Ethernet .
, 㳿: -, -, -, , , ..
1.2
1.1.
, | , / | , |
1 | 20 / 1 / | 1, 2, 3, 5, 5+ 6, 7,F |
. ³ . . . 1.5-2.0 , - 1.2 /. 8-12 /. 12-28 100 10 .
( 100 ) (UTP), 㳿 100 / ( 5)
, , ( ̲- Electromagnetic Interference). (FTP), (STP) .
, .
1.2.
UTP | FTP | S/FTP | S/STP | |
ֳ $ 1 , , | 200-300 5.1 | 280-420 6.2 | 460-690 6.5 | 700-1050 7.3 |
40 10 , 30 ( ̲).
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(- ), , - . , . . , . . .
- - . 300-500 /, 100 7 100 . 2-5 /. 50 /, 10 - 4 100, . . , , .
- . . . . , . , , . .
2 .
(~10), . . 200 /, 110 .
, . ³ 2-3 .
. . .
1.3
(Repeaters)
. - (repeaters), .
- (forward) . , - , .
, "". , , , , , . , , .
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