802.11A / B / G / N / AC Kev Loj Hlob thiab sib txawv

802.11A / B / G / N / AC Kev Loj Hlob thiab sib txawv
Txij li thaum tso tawm thawj ntawm Wi Fi rau cov neeg siv khoom xyoo 1997, WI FI qauv tau hloov pauv tas li, feem ntau nce kev fajseeb ceev thiab nthuav dav. Raws li cov haujlwm tau ntxiv rau thawj IEEE 802.11 tus qauv, lawv tau hloov kho los ntawm nws cov kev hloov (802.11B, 802.11g, thiab lwm yam)

802.11B 2.4GHz
802.11B siv tib qho 2.4 GHz zaus raws li qub 802.11 tus qauv. Nws txhawb qhov siab tshaj plaws theoretical ceev ntawm 11 MBPS thiab ntau yam li 150 ko taw. 802.11B Cheebtsam yog pheej yig, tab sis tus qauv no muaj qhov siab tshaj plaws thiab qeeb tshaj plaws ntawm txhua 802.11 tus qauv. Thiab vim tias 802.11b kev ua haujlwm ntawm 2.4 GHz, khoom siv hauv tsev lossis lwm yam 2.4 GHz Wi fi tes hauj lwm yuav ua rau muaj kev cuam tshuam.

802.11A 5GHz OFDM
Cov hloov kho tshiab "" ntawm cov qauv no tso tawm ib txhij nrog 802.11b. Nws qhia lub thev naus laus zis ntau tshaj plaws hu ua OFDM (Orthoogen zaus faib cov ntsiab lus sib txawv) rau cov cim wireless wireless. 802.11a muab qee qhov zoo tshaj 802.11B: nws khiav haujlwm hauv cov neeg tsis muaj neeg coob tsawg thiab yog yog li tsis muaj kev cuam tshuam rau kev cuam tshuam. Thiab nws bandwidth yog ntau dua 802.11b, nrog theoretical ntau tshaj ntawm 54 MBP.
Tej zaum koj yuav tsis tau ntsib ntau ntau 802.11A cov khoom siv lossis cov routers. Qhov no yog vim 8021b cov khoom siv yog pheej yig dua thiab ua neeg nyiam tshaj plaws hauv kev siv khoom lag luam. 802.11A tsuas yog siv rau kev siv daim ntawv thov ua lag luam.

802.11G 2.4GHz OFDM
Lub 802.11G tus qauv siv tib lub thev naus laus zis ntawm 802.11A. Zoo li 802.11A, nws txhawb qhov siab tshaj plaws ntawm tus nqi ntawm 54 MBPS. Txawm li cas los xij, zoo li 802.11b, nws ua haujlwm nyob rau hauv convested 2.4 GHz zaus (thiab yog li ntawd yog qhov teeb meem ntawm tib yam li 802.11b). 802.11G rov qab tau sib haum nrog 802.11B pab kiag li lawm: 802.11b pab kiag txuas tau rau 802.11g nkag tau cov ntsiab lus (tab sis ntawm 802.11b nrawm).
Nrog 802.11G, cov neeg siv khoom tau ua tiav qhov tseem ceeb hauv Wi Fi Kev Ceev thiab Kev Pov Hwm. Meanwhile, compared to previous generations of products, consumer wireless routers are becoming better and better, with higher power and better coverage.

802.11n (WI FI 4) 2.4 / 5GHZ MIMO
Nrog rau 802.11n tus qauv, WI FI tau dhau los ua nrawm dua thiab txhim khu kev qha. Nws txhawb qhov siab tshaj plaws theoretical tus nqi ntawm 300 Mbps (txog li 450 Mbps thaum siv peb lub kav hlau txais xov). 802.11n siv MIMO (ntau cov lus qhia ntau cov khoom tawm), qhov twg ntau cov transmitters / tau txais kev ua haujlwm ib txhij ntawm ib lossis ob qho kawg ntawm qhov txuas. Qhov no tuaj yeem nce cov ntaub ntawv nce yam tsis xav tau ntau dua bandwidth los yog kis hwj huam. 802.11n tuaj yeem ua haujlwm hauv 2.4 GHz thiab 5 GHz zaus.

802.11ac (Wi Fi 5) 5GHz Mu-Mimo
802.11AC Roosts Wi Fi, nrog nrawm nrawm los ntawm 433 MBPS rau ntau qhov chaw ua ke thib ob. Txhawm rau ua kom tiav qhov kev ua tau zoo no, 802acc no ua haujlwm hauv 52.11n), piv rau plaub ntws ntawm 802.11n), thiab siv lub thev naus laus zis hu ua kev thev naus laus zis. Nrog nqajforming, kav hlau txais xov tuaj yeem tuaj yeem hloov cov xov tooj cua ntsuas, yog li lawv taw qhia ncaj qha rau cov khoom siv tshwj xeeb.

Lwm qhov kev nce qib tseem ceeb ntawm 802.11ac yog ntau tus neeg siv (mu-mimo). Txawm hais tias MIMO ncaj qha ntau ntws mus rau ib tus neeg siv khoom, Mu-Mimo tuaj yeem ua ke cov spatial spetial rau cov neeg tau txais ntau tus neeg. Txawm hais tias Mu-Mimo tsis nce qhov ceev ntawm ib tus neeg siv khoom twg, nws tuaj yeem txhim kho cov ntaub ntawv tag nrho ntawm cov network.
Raws li koj tuaj yeem pom, WI fi kev ua tau txuas ntxiv hloov zuj zus, nrog cov peev xwm nrawm thiab kev ua tau zoo ntawm wired ceev

802.11ax Wi Fi 6
Nyob rau hauv 2018, Wifi Alliance tau siv WiFi cov qauv npe yooj yim kom paub thiab nkag siab. Lawv yuav hloov qhov yuav los tom ntej 802.11ax tus qauv rau WiFi6

WI FI 6, 6?
Ob peb qhov kev ua tau zoo ntawm Wi fi suav nrog kev sib nrug kis, tus nqi sib kis, lub peev xwm network, thiab roj teeb lub neej. Nrog rau kev txhim kho thev naus laus zis thiab sijhawm, tib neeg cov cai yuav tsum ua kom nrawm thiab bandwidth tau dhau los ua kom siab.
Muaj cov teeb meem ntawm cov teeb meem hauv kev sib txuas, xws li network congestion, me kev tiv thaiv me, thiab qhov yuav tsum tau hloov mus tas li.
Tab sis WI Fi 6 yuav coj kev hloov pauv tshiab: nws ua kom zoo rau cov neeg siv kev ua haujlwm zoo, thiab tuaj yeem nqa cov nqi hloov pauv mus dua thiab muaj kev sib kis tau ntev dua.
Zuag qhia tag nrho, piv rau nws cov neeg ua ntej, qhov zoo dua ntawm WI FI 6 yog "lub siab dual siab thiab dual tsawg":
Kev kub ceev: Ua tsaug rau cov kev qhia ntawm cov thev naus laus zis xws li Uplink mu-Mimo, qhov siab tshaj plaws ntawm Wi Fi 6 tuaj yeem hais kom zoo ib yam li kev nrawm nrawm.
Kev nkag mus rau ntau: Qhov kev txhim kho tseem ceeb tshaj plaws ntawm WI FI 6 yog txhawm rau txo cov kab thiab tso cai rau ntau cov khoom siv los txuas rau lub network. Tam sim no, Wi Fi 5 tuaj yeem sib txuas lus nrog plaub pab kiag li lawm, thaum Wi Fi 6 yuav tso cai sib txuas lus nrog nce mus txog kaum ib li kev sib txuas lus ib txhij. WI FI 6 kuj siv ADMA (orthogonal zaus-faib khoom ntau txoj kev nkag tau ntawm 5G los txhim kho kev ua haujlwm spectral zoo thiab network muaj peev xwm.
Tsawg latency: los ntawm kev siv tshuab kev siv tshuab xws li ordma thiab spimialreuse, wi fi kev sib tw, txhim kho kev ua haujlwm, txhim kho kev ua haujlwm, thiab txo cov latency. Los ntawm 30ms rau WI FI 5 txog 20ms, nrog qhov nruab nrab latency txo ntawm 33%.
Kev siv hluav taws xob tsis tshua muaj zog: twt, lwm cov thev naus laus zis tshiab hauv Wi Fi 6, tso cai rau kev sib txuas lus nrog cov chaw sib txuas lus, txo lub sijhawm xav tau kev xa mus rau cov cim. Qhov no txhais tau tias kev txo cov roj teeb thiab txhim kho cov roj teeb neej, ua rau 30% txo qis hauv kev siv hluav taws xob.

Txij xyoo 2012 | Muab cov khoos phis tawj customized rau cov neeg thoob ntiaj teb!