Peb feem ntau siv Wi-Fi kom pom zoo. Thaum peb xav txog kev ceev hauv internet, peb feem ntau saib cov thev naus laus zis los ntawm tus muab kev pabcuam.
Xav txog ntau npaum li cas ntawm qhov kev txhim kho peb tau ua thaum koj saib hauv dial-up internet thiab muab piv rau qhov nrawm uas ua tiav los ntawm fiber ntau optic internet.
Txawm hais tias muaj kev txhim kho hauv cov ntaub ntawv sib txuas thev naus laus zis, peb nyuam qhuav pom tias cov thev naus laus zis wireless uas tuaj nrog nws tau ua rau muaj kev nce qib loj thiab.
Txawm hais tias koj lub Internet ceev npaum li cas, kev sib txuas ntawm Wi-Fi qeeb tseem tuaj yeem cuam tshuam rau koj qhov kev tshawb nrhiav.
Hauv tsab xov xwm no peb yuav saib Wi-Fi, Gi-Fi thiab Li-Fi thev naus laus zis.
Ua ntej, peb yuav tshawb txog keeb kwm luv luv ntawm yuav ua li cas Wi-Fi tau ntes tau kom nrawm dua hauv internet. Tom ntej no, peb tseem yuav saib cov thev naus laus zis tshiab hu ua Li-Fi, uas tau lees tias yuav nrawm dua li cov qauv Wi-Fi tam sim no.
Wi-Fi yog dab tsi?
Wi-Fi yog wireless network technology uas tso cai rau cov cuab yeej txuas rau Is Taws Nem. Kev hais lus, Wi-Fi peb siv niaj hnub no yog ua raws li tus qauv thoob ntiaj teb hu ua IEEE 802.11.
Cov qauv no ua rau muaj kev sib txuas lus ntawm cov khoom siv thiab cov routers tsim los ntawm cov tuam ntxhab thoob plaws ntiaj teb.
Wi-Fi ua haujlwm zoo tshaj plaws rau kev siv kab ntawm kev pom. Qhov no txhais tau hais tias kev cuam tshuam xws li phab ntsa thiab cov khoom siv hauv tsev loj tuaj yeem txo qhov ntau ntawm txhua lub router.
Kev txwv ntawm Wi-nkaus
- ceev: Muab piv rau kev sib txuas nrog, Wi-nkaus yog hom kev sib txuas qeeb dua. Kev sib txuas wireless kuj tseem tuaj yeem ua rau qeeb yog tias ntau cov khoom siv sib txuas sib txuas Wi-Fi
- bandwidth: Feem ntau cov khoom lag luam muaj cov routers tso cai rau ntau tshaj 30 cov khoom siv.
- Kev Pabcuam: Kev sib txuas wireless yuav ntsib "dub pob" qhov twg lub teeb liab tsuas yog tsis muaj vim tias nws nyob deb npaum li cas ntawm lub router lossis vim muaj lwm yam kev cuam tshuam.
- Security: Wi-Fi muaj kev pheej hmoo ntawm raug tawm tsam los ntawm cov neeg ua phem vim tias cov ntsiab lus nkag tau feem ntau raug cuam tshuam los ntawm lub neej ntawd. Piv nrog rau kev sib txuas nrog xws li Ethernet, Wi-Fi tsis xav tau kev sib txuas ntawm lub cev. Ib qho yuav tsum tsuas yog nyob hauv thaj tsam ntawm lub network.
Gi-Fi: Lub Evolution ntawm Gigabit Fidelity
Gi-Fi hais txog kev sib txuas lus wireless uas tuaj yeem tswj cov ntaub ntawv tus nqi ntau dua li ib lab cov khoom lossis gigabits ib ob.
Nws yog me ntsis ntawm cov lus tsis meej pem, tab sis feem ntau cuam tshuam nrog IEEE 802.15.3C tus qauv, uas tau luam tawm xyoo 2009. Cov qauv no tso cai rau cov ntaub ntawv siab heev nyob rau hauv luv luv txog li 10m.
Txij li thaum pib ntawm thawj Wi-Fi tus qauv hauv xyoo 1999, Wi-Fi tau nce tsis tu ncua nws qhov nruab nrab thiab cov ntaub ntawv siab tshaj plaws.
Hauv xyoo 2013, Wi-Fi tau dhau los sai dua nrog qhov tshwm sim ntawm 802.11ac tus qauv, uas ntim yuav luag peb npaug ntawm qhov nrawm ntawm nws cov thawj, 802.11n. Cov txheej txheem no rhuav tshem cov gigabit ib thib ob barrier.
Niaj hnub no, peb xa mus rau tus qauv no raws li Wi-Fi 5 tus qauv.
Tsis ntev los no, Wi-Fi Alliance tau ua haujlwm ntawm tus qauv txuas ntxiv hu ua 802.11ax, feem ntau hu ua Wi-nkaus 6.
Wifi-6 tuaj yeem theoretically sab saum toj ntawm txog 9.6Gbps, uas yog nce los ntawm Wi-Fi 5's 3.5 Gbps. Wi-Fi 6 routers yuav tsim kom muaj txiaj ntsig zoo rau ntau lub cuab yeej hauv ib tsev neeg.
Qhov no yog qhov tseem ceeb tshwj xeeb vim tias kev nce hauv Internet ntawm Tej yam thev naus laus zis txuas ntxiv mus.
Muaj ob lub tswv yim tseem ceeb rau Wi-nkaus 6. Tus MU-MIMO thev naus laus zis tso cai rau lub router sib txuas lus nrog txog 8 lub cuab yeej thaum lub sijhawm.
OFDMA, lossis orthogonal zaus faib ntau qhov kev nkag tuaj yeem tso cai rau lub router xa cov ntaub ntawv mus rau ntau yam khoom siv hauv ib kis.
Ob lub thev naus laus zis no yuav tso cai rau kev sib txuas lus sai ntawm koj lub router thiab cov khoom siv nyob ib puag ncig nws.
Li-Fi yog dab tsi?
Li-Fi yog hais txog ib hom kev sib txuas lus wireless uas siv lub teeb xa cov ntaub ntawv ntawm cov khoom siv. Nws ua haujlwm los ntawm kev khiav hluav taws xob tam sim no ntawm lub teeb LED. Txij li cov LEDs yog cov khoom siv semiconductor, lawv tuaj yeem hloov pauv ntawm qhov nrawm heev.
Qhov kev hloov kho hnyav no tsis tuaj yeem pom los ntawm tib neeg lub qhov muag tab sis tuaj yeem kuaj pom thiab txhais tau los ntawm cov cuab yeej tshwj xeeb Li-Fi.
Cov thev naus laus zis zoo ib yam li Wi-Fi, tab sis thaum Wi-Fi siv lub xov tooj cua zaus xa cov ntaub ntawv, Li-Fi siv cov kev hloov pauv ntawm lub teeb siv los xa cov ntaub ntawv.
Vim li no, Li-Fi muaj qhov zoo dua hauv cov cheeb tsam uas raug cuam tshuam los ntawm electromagnetic cuam tshuam. Raws li txoj cai, Li-Fi tuaj yeem xa mus ntawm qhov ceev txog li 100 Gbps.
Li-Fi tseem tuaj yeem ua haujlwm nyob rau nruab hnub vim tias cov thev naus laus zis tso siab rau kev tshawb pom ntawm kev hloov pauv ntawm lub teeb siv thiab tsis yog qib siab uas yuav raug teeb tsa los ntawm ib puag ncig tam sim no.
Li-Fi siv optical wireless kev sib txuas lus (OWC) thev naus laus zis. Niaj hnub no OWC tech siv ob lub lasers los yog lub teeb emitting diodes (LEDs) ua transmitters.
Cov yam ntxwv tseem ceeb ntawm Li-Fi
- Li-Fi tsis muaj kev cuam tshuam. Cov teeb liab Li-Fi tuaj yeem siv rau hauv thaj chaw ua phem xws li tsev kho mob, dav hlau, thiab cov chaw tsim khoom.
- Cov thev naus laus zis kuj tseem muaj qhov qis latency uas nce mus txog peb zaug qis dua Wi-Fi.
- Li-Fi muaj kev nyab xeeb ntau dua vim tias lub cev muaj kev cuam tshuam tsis pub cov teeb liab tawm hauv chav.
- Li-Fi muaj cov kev pabcuam bidirectional, txhais tau tias nws tuaj yeem tswj tau ob qho tib si uploads thiab rub tawm ib txhij.
- Qee daim ntawv thov twb txhawb WPA2 Tus Kheej thiab Kev Tshawb Fawb Kev Lag Luam.
Pros thiab Cons ntawm Li-Fi
pros
- ceev: Lub teeb tsis muaj peev xwm nqa tau cov ntaub ntawv ntau dua li xov tooj cua. Qhov no txhais tau hais tias kev xa cov ntaub ntawv siv sijhawm luv dua.
- efficiency: Txhua lub teeb LED uas twb tau siv lawm tuaj yeem siv Li-Fi thev naus laus zis. Cov neeg nqa khoom tsis tas yuav nqis peev ntau lub sijhawm tsim cov routers, kav hlau txais xov, thiab lwm yam kev sib txuas lus.
- Security: Li-Fi tes hauj lwm nyuaj rau cuam tshuam yog tias koj nyob sab nraum chav uas teeb tsa tech. Tsis zoo li Wi-Fi, phab ntsa ntawm koj qhov chaw tam sim no thaiv li-Fi teeb liab.
- muaj: Li-Fi tuaj yeem yooj yim ua ke nrog cov teeb pom kev uas twb muaj lawm xws li teeb pom kev, thiab teeb lub tsev.
cons
- Limited hauv Range: Txawm hais tias muaj txiaj ntsig zoo hauv kev ruaj ntseg, Li-Fi tsis tuaj yeem nkag mus rau cov khoom opaque txhais tau hais tias Li-Fi ntau yam tsawg heev. Hauv qhov chaw qhib, Li-Fi tsuas tuaj yeem mus txog 10 meters.
- Tsawg Compatibility: Raws li cov thev naus laus zis tshiab, cov khoom siv tseem ceeb tsis zoo li yuav hloov mus rau Li-Fi sai sai.
- Tsis daws internet ceev: Cov chaw muab kev pabcuam tseem tswj tau sai npaum li cas cov ntaub ntawv tuaj yeem nkag mus rau hauv Li-Fi ntaus ntawv.
xaus
Wi-Fi tau sib koom ua ke rau hauv lub neej tam sim no ua haujlwm li cas. Nws yog ib qho nyuaj rau xav txog lub ntiaj teb tsis muaj Wi-Fi txuas peb lub xov tooj, laptops, thiab cov khoom siv ntse rau hauv lub vev xaib.
Raws li kev thov kom ceev internet ceev txuas ntxiv mus ntxiv, Wi-Fi, Gi-Fi thiab Li-Fi thev naus laus zis yuav txuas ntxiv mus ntxiv.
Cov neeg siv khoom lag luam tseem ceeb tau maj mam hloov kho Gi-Fi, lossis gigabit wireless thev naus laus zis raws li streaming 4K video thiab ntau lub cuab yeej ntse dhau los ua tus qauv.
Cov thev naus laus zis tshiab xws li Li-Fi tab tom nrhiav kev lag luam niche siv cov neeg siv kom zoo dua ntawm cov ntaub ntawv ceev dua thiab cov yam ntxwv ruaj ntseg.
Sau ntawv cia Ncua