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i386
Expert


: 17 Apr 2002
vv: 530
: internet
v ?

v ?

ISM (900MHz 2.4GHz)

v , . FCC (Federal Communications Commission), ETSI (European Telecommunication Standart Institute) . v : vv, , ... vvv (v) . vv . ISM (Industrial -900-928 MHz, Scientific-2.4-2.4835GHz, and Medical-5.725-5.85 GHz- (FCC 15.247)) 900MHz 2.4 GHz . unlicensed vvv v 뺺 . v . , v ( 뺺v ) . 900 MHz GSM (Global System for Mobile Communications) 㺺 2.4 GHz - 2.48 GHz- 80 MHz v . 뺺 v ( :) )v 뺺 .))

( 2.4GHz v 뺺)


IEEE 802,11 (Wireless Local Area Network)
IEEE 802,16 (Broadband Wireless Access)

IEEE802.11-
v v vv ethernet v. v v 㺺 v. v IEEE- Radio LAN- IEEE 802.11 .
v v . Vv . v 802.11 MAC 3 v :

- (ad hoc)
- Infrastructure

- Point coordination v CSMA/CA
v
- Frequency Hopping - 1 Mb/s
- Direct Sequence - 1 2 Mb/s
- Infrared
( v )
vv 802.11- 802.11b :
- Frequency Hopping - 2 Mb/s
- Direct Sequence - 5.5 11 Mb/s

MA v (distributed mode-CSMA/CA) vv (coordinated mode-polling mode) v . 802.11 v RTS/CTS, (fragmentation) . v . 802.11 v (WEP-RC4 40 , v 128 RC4- )- . ͺ㺺 802.11- (multirate, roaming, inter AP communication...) 㺺v . 802.11 vvvvv (bit-rate- , , ) v v .
v vvvvv 802.11 vvvvv 1997 9 802.11 . v vvv .

vvvvv . Vv v 802.11 vv vvv v vvv v, , . v vvv .

802.11-b 802.11-a (5 GHz- 802.11)
802.11 7 (?) 5GHz 2.4 GHz . 802.11 - v 뺺v .

802.11-a (5 GHz- 802.11)
UNII OFDM 1999 ,.
OFDM v HiperLan II- v , 20 MHz 52 纺 6 12 24 Mb/s, 9 18 36 48 54 Mb/s- . vvv v (1999-10. Wireless. Online Wireless letter)
Vv v Direct Sequency- v 802.11 b (802.11 HR) . 2.4 GHz- 㺺, 2.4 GHz vv . 5.5 11 Mb/s.
---

Jun.25.03 3:47 pm 
    v         
i386
Expert


: 17 Apr 2002
vv: 530
: internet

M.A.C.

-------------------------------------------Basic access mechanism
----------------------------------------------------Fragmentation
()--------------------------------------ncryption
MAC Layer Management
-----------------------------------------------Synchronization
v -------------------------------Power management
vv (vvv )--------------Roaming
Physical Layer Convergence Protocol (PLCP)
----------------------------PHY-specific
---------------------------------------------CCA signal (CarrierSense)
Physical Medium Dependent Sublayer (PMD)
-----------------------------------Modulation and Encoding
PHY Layer Management
------------------------------------------Channel tuning
v vvv ---------------------PHY MIB
Station Management
MAC v ----------Interacts with both MAC & PHY Management

IEEE 802.11- v

a.Frequency Hopping Spread Spectrum ( v )
1 Mbit/s. 2 v FSK (Frequency Shift Keying)
-79 . 1 1 MHz = 79MHz
b.Direct Sequence Spread Spectrum ( v )
1 Mbit/s - DBPSK (Differential Binary Phase Shift Keying)
2 Mbit/s - DQPSK (Differential Quadrature PSK)
-11 Barker- . C 22MHz
3. Infrared. ( )
1 Mbit/s - 16-PPM (16 Pulse Position Modulation)
2 Mbit/s - 4-PPM.
- 850 nanometer- 950 nanometer- . v v ( 2 PC- IR vv . v 10 )

MA v (distributed mode-CSMA/CA) (coordinated mode polling mode) v . 802.11 v RTS/CTS, (fragmentation) . v (㺺 ) . 802.11 v (WEP-RC4 40 , v 128 RC4- )- . ( vv vv. )
vvvvv . Vv v 802.11 vv vvv v vvv v, , . v vvv . 人 1 2Mb/s 5Ghz vv (HiperLan 5 Ghz- 802.11). 2.4 Ghz- 5 Ghz-vv v ()-vv ( ). v ( Harris Lucent) 2.4 Ghz- vv Spread Spectrum 5 Mb/s 11 Mb/s .
Lucent PPM (Pulse Position Modulation) vvvvv (5Mb/s 10Mb/s) . Direct Sequence vv v 㺺, v (encode) . PPM vvv .
Harris MBOK (M-ary Bi-Orthogonal Keying) 5.5 Mb/s 11 Mb/s PPM- vv v v .
802.11 v. CCK (Complementary Code Keying) 802.11 HR FCC- vv 1999 9- 16- 802.11- IEEE 802.11 High Rate . 802.11- vv . IEEE 802.11 HR 2.4GHz 11Mb/s 5Mb/s (CCK ), 802.11 DS (PSK, FSK ) .
802.11-b 802.11-a (5 GHz- 802.11)
802.11 5GHz 2.4 GHz . 802.11 - v 뺺v .
802.11-a (5 GHz- 802.11) - UNII (5GHz) OFDM 1999 . OFDM- v HiperLan II- v 人 , 20 MHz 52 纺 6, 12, 24 Mb/s, 9, 18, 36, 48, 54 Mb/s- .
802.11b (IEEE802.11HR) - 802.11- v . - 2.4GHz. .
Frequency Hopping - 2 Mb/s 4 v FSK
Direct Sequence - 5.5 11 Mb/s DQPSK (+CCK)
2.4 GHz- 㺺, 2.4 GHz vv .

Jun.26.03 10:40 am 
    v         
i386
Expert


: 17 Apr 2002
vv: 530
: internet

HiperLan
HiperLan 802.11-c v . ETSI- v v vvvvv . v , 㺺 v 1996 .
Hiperlan (5.1GHz-5.3GHz, ) Spread Spectrum- v. , 23.5 Mbs
CSMA/CA , MAC v . v vv . Hiperlan- ( ) ad-hoc vv : v (computer) vv vv vv .
Hiperlan v ad-hoc 㺺 v.
Hiperlan isochronous ( vv..?) v v, v v, v v . ̺ header . , (), v (v ).



ad hoc.jpg
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ad hoc.jpg


Jun.27.03 6:01 pm 
    v         
i386
Expert


: 17 Apr 2002
vv: 530
: internet

HiperLan II
HiperLan II v HiperLan- v . HiperLan ad-hoc v HiperLan infrastructure v v (wireless distribution systems) . ETSI (Broadband Radio Access Network group)- , 5 GHz (5.4GHz-5.7GHz)
, (), v (v ).
HiperLan II OFDM . 纺 v (FEC- convolutional- ) (6, 9, 12, 18, 27 36 Mb/s, 54 Mb/s). 20 MHz: 48 OFDM 纺, 4 纺 ( 312.5Hz- 52 纺) v.
HiperLan II Wireless ATM 㺺, vv v TDMA v. v 54 payload ( )-, MAC SAR (Segmentation And Reassembly- 54 vvv ) ARQ (Automatic Request - MAC v )- . .. ̺ vv v .
HiperLan II ATM vvvv 纺, IP , Firewire (IEEE 1394), digital voice (㺺 )- v. HiperLan II- v . , (ATM ).
HiperLan II OFDM . 纺 v (FEC- convolutional- ) (6, 9, 12, 18, 27 36 Mb/s, 54 Mb/s). 20 MHz: 48 OFDM 纺, 4 纺 ( 312.5Hz- 52 纺) v.
HiperLan II Wireless ATM 㺺, vv v TDMA v. v 54 payload ( )-, MAC SAR (Segmentation And Reassembly- 54 vvvv ) ARQ (Automatic Request - MAC v )- . .. ̺ vv v .
HiperLan II ATM vvvv 纺, IP , Firewire (IEEE 1394), digital voice (㺺 )- v. HiperLan II- v . , (ATM ).


vv i386 vv Jun.28.03 4:41 pm -, 1

Jun.27.03 8:10 pm 
    v         
i386
Expert


: 17 Apr 2002
vv: 530
: internet

OpenAir
OpenAir Proxim- . Proxim WLAN- v 㺺 OpenAir- , OpenAir- vvvvv Proxim- .
OpenAir 802.11- 㺺 Frequency Hopping 0.8 Mb/s (2FSK), 1.6 Mb/s (4FSK) . contention 802.11- v , vvv . OpenAir- MAC v CSMA/CA, RTS/CTS , v contentin v RTS/CTS . v v contention access . OpenAir v v, v (password-Security ID) Network ID- vv.

Jun.27.03 8:12 pm 
    v         
i386
Expert


: 17 Apr 2002
vv: 530
: internet

IEEE 802.16 (Broadband Wireless Access)

802.16 v 802.11- 人 . LAN WAN- ..
IEEE 802.16 - 10-66GHz- MAC v .
P802.16 a 2-11GHz- MAC v .
- v vv
-
- v LAN-
- v Point-to-Point Point-to-Multipoint
- QoS (heterogeneous) 纺
- v (>2Mbs)
IEEE802.16 . IEEE802.11 .
Point-to-Multipoint distributed . Һ v vv 㺺 .
, point-to-point .
v .
802,11 v v , 802,16 vvv . . 802,11- v vv. 802,16- router vv vv

Jun.27.03 8:14 pm 
    v         
SeD
vv
   vv


: 17 Oct 2002
vv: 199
: UB

i386, thanks a lot, ene chini mash ikh medeelel baina. Bi odoogoor Apple MAC-iig mash ikheer sudalj baina, Tegeed chamaas neg zuil asuumaar baina, MAC-iig yaj FreeBSD server-tei dotood suljeend kholbokh ve?, zov ajillaj baigaag ni yaj shalgakh ve?

Jun.28.03 1:36 pm 
    v          
iTES





bi neeh sain medehgui baina. minii mac buur 94 oniih. chi LAN-iihaa talaar Apple-iinhaa talaar joohon delgerengui nad ru maildchih /bid_nar@yahoo.com/ esvel msngr -r orood ir.

Jun.28.03 3:45 pm 
        
i386
Expert


: 17 Apr 2002
vv: 530
: internet
v



- պ
-
- 802- vv (v vvvv, )
v
(hidden nodes)
պ㺺
-
- v (㺺 )
̺ v v vv ethernet v. v v 㺺 v. v IEEE- Radio LAN- IEEE 802.11 . v .


1. . v
DECT - 1.880-1.900GHz
Digital European Cordless T(elephone)elecommunications
RLAN - 2.45 GHz 1MHz, T/R 10-01
- 2.4835 - 2.500 GHz -
HIPERLAN - 5.2 GHz 100+50 MHz 17 GHz 200 MHz, T/R 22-06
RLAN - 61.0 - 61.5 GHz, T/R 22-03
GSM - 915 MHz - Global System for Mobile

2. . v
FCC Part 15
902 - 928 MHz
2.4 - 2.4835 GHz ̺
5.725 - 5.875 GHz
- Unlicensed PCS, 1.910 - 1.930 GHz
10 MHz v ( 1.920-1.930 GHz)
10 MHz (1.910-1.920 GHz)
- Unlicensed PCS, 2.390 - 2.400 GHz
- 40 GHz
8.5 GHz unlicensed v
- LAN 㺺
- 59-64 GHz 5 GHz
- 71 153 GHz 2.5GHz- 7
7.3 GHz licensed v
- 40.5-42.5GHz, 47.2-48.2GHz 3GHz 2
- 71 153 GHz 4.3 GHz 7
-18.8 - 19.2 GHz



firstregion.JPG
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Zurag 1.
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3thregion.JPG
 Description:
3. . v
- 2.471 - 2.497 GHz RLAN-
- 2.4-2.5GHz
-17-19 GHz Ǻ . v.
 Filesize:  48.96 KB
 Viewed:  15 Time(s)

3thregion.JPG


Jun.28.03 6:52 pm 
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