CATV
CATV (Community Antenna Television) ' . , , ' . Internet CATV .
CATV . CATV ( ) . 璺 , , . , . .
Internet , 璺 '. Ethernet lOBase.
Internet. Internet, Internet .
, ( PSTN, -1), Internet, - , , . , . , Internet.
. , . , . , PSTN, 56 /. 364 / 1,5 /.
, . 128 /, Web-. Web- CATV.
璺, , ' - . ' CATV . , '. 㳿 " " ( ), . . CATV , .
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SMDS
SMDS (Switched MLillimegabil Data Service ) , "" . , "" , .
㳿 SMDS ' , ' . 㳿 , 7 168 . SMDS ( , ) SMDS. SMDS ( -3 SONET) .
SMDS , , . ³ , SMDS . 1,544 45 /. SMDS . ATM. SMDS , Frame Relay 㳿, SMDS .
2.4.5
璺 , , . , , . 㳿 ᒺ .
㳿, .
- 㳿. SMR (Specialized Mobile Radio ') 1 200 / 19,2 /. ESMR (Enhanced SMR) .
- 㳿. 4 800 9 600 /. , .
- ̳ 㳿. 㳿 ' .
- 㳿. ' .
- 㳿 . ' .
, . , ' 14,4 /, 64 /.
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2.5 ǒ
, , ' . , . ' . , ᒺ , Internet, .
ϳ , . . 璺 . .
- . . , Internet, .
- ' , . , .
- . , ' .
, . . .
' :
- ';
- -;
- '.
2.5.1 璺
Internet . , , ( ' ) IP-.
', , . . ' : -, ' , IP-, DHCP (Dynamic Host Configuration Protocol) ' . ' .
, DHCP ', , IP- TCP/IP.
- , "", . IP- . - . IP- (', ' ).
' , , Web-, , ' ( !). Web- . ( IP- ) , ', , Web- '.
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- IP- , ' ' .
- , . , HTTP Web- TCP 80.
- , .
- ̳ , .
NAT (Network Address Translation ) , RFC 1631. . 2.8 .
NAT .
1. , 볺 ' - 192.168.1.9, URL:www.tacteam.net. - -, , "" www.tacteam.net.
2. NAT 볺 192.168.1.9 www.tacteam.net . IP- , UDP.
3. NAT , , 192.168.1.9, IP-, .
4. NAT www.tacteam.net . DNS (Domain Name Service) ' Web- IP- , www.tacteam.net.
5. www.tacteam.net , IP- NAT.
NAT, , 볺, (192.168.1.9), TCP UDP, .