- - .
, , 0, .
(0), : (S ), ( 璺 Sp), () N.
0 = S * N/ c + Sp * N, / (2.1)
, 300 , 30 . :
0 = (300*30)/ + 0 * 30 = 9000 / = 9/ = 72 /.
, , 䳺 72 / . , , 㳿. , : , , 72 / c.
, ( ) 䳿 .
ϳ , , , ( .1). .
Wi-Fi, WiFi ( . Wireless Fidelity) , Wi-Fi Alliance. () ' , ' IEEE 802.11 (Institute of Electrical and Electronic Engineers , ). IEEE 802.11g, .
Wireless LAN , .
Wi-Fi .
볺 - (Ad-hoc), , 볺 ' . (SSID) 0,1 / 100 . 0,1 / Wi-Fi. SSID , 볺 , . 䳿 SSID . Wi-Fi 볺 '.
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2.1 -
. ., / | . . | . . , | ||
802.11a | ||||
802.11b | ||||
802.11g | ||||
802.11n | ||||
10Base-5 | ||||
10Base-2 | ||||
10Base-T | ||||
10Base-F | ||||
100Base-TX | ||||
100Base-T4 | ||||
100Base-FX | ||||
1000Base-T | ||||
1000BaseLX | ||||
Bluetooth 3.1 | ||||
HomePNA 3.1 | , | |||
HomePlug AV | ||||
v.90 | 56,4 | |||
xDSL | 62 / 26 | 7,5 |
, Wi-Fi. -, , . .
' :
()
( )
, ( )
:
()
Wi-Fi- () (, , ), ' ' .
100 , 300400 . ( ), , .
802.11b, 802.11a, 5 54 /, 802.11g, 2,4 54 /. , 802.11n, 320 /.
Wi-Fi (Access Point), ( -) . 50-100 ( - Wi-Fi), .
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, , Wi-Fi , 䳿. 䳿 ' . Wi-Fi , , .
Wi-Fi Direct ( Wi-Fi Peer-to-Peer) ' ' Wi-Fi . ' , Bluetooth. , ' , Wi-Fi Direct. , - Wi-Fi.
Wi-Fi:
- , / . ̳, , , , , .
- .
- Wi-Fi . ' Wi-Fi.
- Wi-Fi ( 100 ) , .
Wi-Fi:
- . ; , , , . , , , , Wi-Fi , , Wi-Fi-.
- WEP ( ). , WPA WPA2, .
Wi-Fi , -, , Wi-Fi- ( Wi-Fi (! Wi-Fi) . , , , , , , ).
Ethernet (, . aether ) (') , CSMA/CD ( ). . , , . , .
Ethernet- 10/, Fast Ethernet 100/, Gigabit Ethernet 1000/, 10 Gigabit Ethernet 10/. 2006 100/ (100 Gigabit Ethernet).
Ethernet , . Ethernet - MAC-, . , , , Ethernet- . - .
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Ethernet , 㳿 , :
10BASE5 Thick () Ethernet;
10Base2 Thin () Ethernet;
10BaseT Twisted-pair Ethernet (Ethernet );
10Broad36 75- ;
10BaseF .
/; : Base , Broad ; (T , F ) ( , 10Base2, 250300 )
Fast Ethernet ( Ethernet) , Ethernet 100 /, 10 Ethernet 10 /.
㳿 Fast Ethernet Ethernet . г MAC LLC Fast Ethernet , 802.3 802.2.
Fast Ethernet , /, l0-Base-T/l0Base-F. Fast Ethernet 200 .
Fast Ethernet , , , ' ( ). Fast Ethernet , , .
802.3u Fast Ethernet :
l00Base-TX UTP 5 STP;
100Base-T4 UTP 3, 4 5;
l00Base-FX , .
5 , l00Base-TX 100Base-T4 :
l0Base-T 2 3;
l0Base-T full-duplex 2 3;
l00Base-TX 2 5 (STP);
100Base-T4 4 3;
l00Base-TX full-duplex 2 5 ( Type 1A STP).
l0Base-T , 100Base-T4 .
Gigabit Ethernet (GbE) , 1000 /. Gigabit Ethernet , IEEE 802.3z. 802.3z 1000Base-X, X- -CX,-SX,-LX ()-ZX.
IEEE 802.3ab, 1999 , Gigabit Ethernet (UTP) 5, 5e 6 1000Base-T. 802.3ab, Gigabit Ethernet , .
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Ethernet- , , , , .
Gigabit Ethernet:
- 1000Base-SX, ;
- 1000Base-LX, ;
- 1000Base-CX,
- 1000BASE-T, .
Bluetooth (. Bluetooth) ', Bluetooth . Bluetooth SIG (. Special Interest Group), Lucent, Microsoft , ' . Bluetooth ( ) '. , , Bluetooth .
Bluetooth . 2.4 , (Bluetooth -) ' 10 100 . г , , , ' 10 , . , 0.3 standby 30 . Bluetooth , 8 128 . , , .
Bluetooth FHSS (. Frequency-hopping spread spectrum). : (1600 ), (pattern), 79 . "" , - . Bluetooth "" (piconet) - 2 8 , . master, slave. Master , slave - , . Bluetooth ' ( 10) "scatternet" (. to scatter ""). , master () slave () . , scatternet Bluetooth ' 71 , -, Internet '. Bluetooth , , .
Bluetooth (PAN, private area networks), , , PDA, 3-, ' . Bluetooth , , . Bluetooth : PDA ' ' , . - , .
HomePNA (. Home Phoneline Networking Alliance,) ' , 㳿 . HomePNA 3.1 , , IPTV, . , . HomePNA 3.1 , ADSL, ISDN , DVB-S , HomePNA 3.1 . HomePNA 3.1 ,
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HomePNA 3.1:
1. (, )
2. , HomePNA.
HomePlug AV PLC (. Power Line Communication) . , - - .
㳿, , -, ' . PLC- , , . . .
:
- , PLC-, , 3-5 .
- . , Powerline- , 50% .
- PLC , (, ), ' .
- , PLC READY.
- ' , . PLC-.
́ ́ '́ (. Dial-up link) ', ' - -. ' , , . ' '.
V.90 . 56 /, 33,6 /.
' , . ϳ ' - , , ' .
, , . - '. ' ' , .
xDigital subscriber line (DSL, digital subscriber loop) , .
㳿 DSL , , , . 㳿 DSL , , .