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31. Radio-Ethernet.
Radio-Ethernet
[6], ( RadioEthernet) , . , -, , . , , . (Internet ) , . , . , , . , , 11/. , Aironet Wireless Technology Inc., Lucent Technologies, BreezeCom. , , , , . , , . , , , . , , . , 2/, 10-15 , 64/. , . , , , . , 45 90. , , , . , 11/ .
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Radio-Ethernet - , .. . , , () (DSSS) (FHSS) , (DSSS FHSS) IEEE 802.11 Radio Ethernet 2,4 . FHSS 2,4 ( 79 ).
DSSS DSSS-, ( , , ). 2 / DSSS 11 /. FHSS 4 /. 3-6 .
- , , Ethernet', , ( "" ), . CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) 802.11
Spread Spectrum ( ) , , , . "" . (Pseudorandom Number, PN), . . PN "" . , "" . - . FHSS , . , . , . , , . DHSS ( 10) . , . , . /.
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, , . DSSS ( 11 /) , , ( ) . DSSS FHSS. FHSS , , . FHSS- , , DSSS, - , DSSS-; , . , , . DSSS , FHSS . - DSSS . .
, Spread Spectrum :
- 11 /c
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Esc | \ | | ||
1! | Z | ||
2 @ | X | ||
3 # | C | ||
4 $ | V | ||
5 % | B | ||
6 ^ | N | ||
7 & | M | ||
8 * | , < | ||
9 ( | . > | ||
0) | /? | ||
- _ | Shift () | ||
= + | PrtScr | ||
Backspace | Alt | ||
Tab | Space | ||
Q | Caps Lock | ||
W | F1 | ||
E | F2 | ||
R | F3 | ||
T | F4 | ||
Y | F5 | ||
U | F6 | ||
I | F7 | ||
O | F8 | ||
P | F9 | ||
[ { | F10 | ||
] } | Num Lock | ||
Enter | Scroll Lock | ||
Ctrl | Home 7 | ||
A | ↑ 8 | ||
S | PgUp 9 | ||
D | - ( . -) | ||
F | ← 4 | ||
G | 5 ( . -) | ||
H | → 6 | ||
J | + ( . -) | ||
K | End 1 | ||
L | ↓ 2 | ||
;: | PgDown 3 | ||
Ins 0 | |||
` ~ | Del. | ||
Shift () |
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