Nrog rau txoj kev loj hlob ntawm Internet technology, network kis ceev kuj tau zoo heev.Hauv kev sib kis network, nqaim band thiab broadband yog ob txoj hauv kev sib kis.Kab lus no yuav piav qhia qhov txawv ntawm qhov nqaim thiab boardband, thiab txheeb xyuas qhov zoo thiab qhov tsis zoo ntawm txhua tus.
1.Qhov txawv ntawm Narrowband thiab Broadband
Narrowband thiab broadband yog ob hom kev sib txuas hauv network, thiab qhov sib txawv tseem ceeb ntawm lawv yog kis ceev thiab bandwidth.
Narrowband feem ntau txhais tau tias yog txoj kev sib txuas lus nrog kev sib kis qeeb qeeb thiab nqaim bandwidth.Narrowband kis tau tsuas yog kis tau me me ntawm cov ntaub ntawv, thiab tsim nyog rau qee qhov kev thov yooj yim, xws li xov tooj thiab fax.Narrowband kis tau tus mob thev naus laus zis yog qhov yooj yim thiab tus nqi qis, tab sis qhov kev sib kis ceev qeeb thiab tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev sib kis ceev xws li cov ntaub ntawv loj xa mus lossis cov yeeb yaj kiab siab.
Broadband hais txog txoj kev sib txuas lus nrog kev sib kis ceev ceev thiab dav bandwidth.Broadband kis tau ntau hom ntaub ntawv tib lub sijhawm, xws li lub suab, yees duab, duab, thiab lwm yam. Broadband kis tau tus mob yog ib tug high-ceev, loj-muaj peev xwm kis tau tus mob cov ntaub ntawv uas muaj peev xwm paub sib tov sib kis ntawm ntau yam sib txawv ntawm cov teeb liab ntawm tib yam. Kev sib txuas lus nruab nrab Broadband kis tau tus mob thev naus laus zis ntau dua li qhov nqaim, tuaj yeem lav qhov kev ruaj ntseg thiab kev nyab xeeb, thiab tau dhau los ua txoj hauv kev xa xov tseem ceeb hauv Internet niaj hnub.Feem ntau, nqaim thiab broadband muaj lawv tus kheej zoo thiab qhov tsis zoo.Txoj kev kis twg los xaiv yog nyob ntawm qhov xav tau tiag tiag.
Los ntawm lub tswv yim ntawm qhov kev xav, "nqaim" thiab "dav" yog cov ntsiab lus txheeb ze, tsis muaj cov lej txwv nruj, thiab lawv yog cov yam ntxwv channel txheeb ze rau cov yam ntxwv teeb liab.Qhov sib txawv ntawm ob yog raws li hauv qab no: ① "Lub teeb liab yuav kis tau" yog hu ua qhov chaw.Lub hauv paus teeb liab uas nws bandwidth tsawg dua qhov nruab nrab zaus ntawm tus cab kuj yog lub teeb liab nqaim, thiab qhov sib txawv, lub teeb liab nrog qhov sib piv yog hu ua broadband teeb liab.②Cov peev txheej zaus muab faib rau koj + qhov chaw nthuav tawm tiag tiag, peb hu nws lub channel.Qhov dav dua qhov faib cov peev txheej ntau zaus thiab qhov ruaj khov ntawm qhov chaw nthuav tawm, qhov siab dua cov ntaub ntawv uas cov channel tuaj yeem nqa tau.③ Los ntawm lub spectrum ntawm lub waveform, lub teeb liab bandwidth yog Δf, thiab cov cab kuj zaus yog fc.Thaum Δf <
Txhawm rau muab nws yooj yim, qhov sib txawv loj tshaj ntawm broadband thiab nqaim band yog bandwidth.Tsis tsuas yog Tsoom Fwv Teb Chaws Kev Sib Txuas Lus ntawm Tebchaws Meskas tau muab cov lus piav qhia txog qhov no hauv 2015, tab sis nws kuj tau hais meej meej rau Hnub Xov Xwm Ntiaj Teb hauv xyoo 2010 tias bandwidths tsawg dua 4M yog hu ua nqaim band, thiab tsuas yog bandwidths ntau dua 4M lossis siab dua tuaj yeem ua tau. hu ua broadband.
Dab tsi yog bandwidth?
Lo lus bandwidth pib yog hais txog qhov dav ntawm electromagnetic yoj band.Cias muab, nws yog qhov sib txawv ntawm qhov siab tshaj plaws thiab qis tshaj zaus ntawm lub teeb liab.Tam sim no, nws tau siv ntau dua los piav txog qhov siab tshaj plaws uas lub network lossis kab tuaj yeem xa cov ntaub ntawv.Hauv kev lag luam kev sib txuas lus, ntau tus neeg muab piv rau txoj kev loj, tus nqi ntawm cov ntaub ntawv xa mus rau kab hauv ib lub sijhawm.
Chav tsev feem ntau ntawm bandwidth yog bps (ntsis ib thib ob), uas yog tus naj npawb ntawm cov khoom tuaj yeem xa mus rau ib ob.Bandwidth yog ib lub tswv yim tseem ceeb hauv cov teb xws li kev tshawb fawb cov ntaub ntawv, xov tooj cua, kev sib txuas lus, teeb liab ua, thiab spectroscopy.
2.Qhov zoo thiab qhov tsis zoo ntawm qhov nqaim thiab broadband
2.1 Qhov zoo ntawm qhov nqaim band
1. Tus nqi kuj pheej yig, tsim nyog rau kev siv kev sib txuas lus tsawg.
2. Muaj feem xyuam rau qee txoj kev sib txuas lus yooj yim, xws li xov tooj, fax, thiab lwm yam.
3. Yooj yim rau nruab thiab siv.
2.2 Disadvantages ntawm nqaim band
1. Kev sib kis ceev yog qeeb, thiab nws tsuas tuaj yeem xa cov ntawv yooj yim, cov lej, thiab lwm yam, thiab tsis haum rau cov ntaub ntawv loj, xws li video, suab, thiab lwm yam.
2. Kev ruaj ntseg thiab kev ruaj ntseg ntawm cov ntaub ntawv xa mus tsis tuaj yeem lav.
3. Lub bandwidth yog me me thiab muaj peev xwm kis tau tus mob tsawg.
Broadband kis tau tus mob technology muaj cov nram qab no zoo:
Kev kub ceev
Broadband kis tau tus mob thev naus laus zis muaj kev sib kis ceev heev, uas tuaj yeem ua tau raws li tib neeg cov kev xav tau rau kev muaj peev xwm loj thiab cov ntaub ntawv ceev ceev.
Muaj peev xwm
Broadband kis tau tus mob thev naus laus zis tuaj yeem xa tawm ntau hom teeb liab tib lub sijhawm, paub txog kev sib koom ua ke thiab sib koom ntawm cov ntaub ntawv xov xwm, thiab muaj peev xwm kis tau tus mob loj.
Muaj zog ruaj khov
Broadband kis tau tus mob thev naus laus zis txo cov kev cuam tshuam channel thiab suab nrov thiab lwm yam cuam tshuam los ntawm kev siv tshuab multiplexing, thiab txhim kho kev sib kis tau zoo thiab ruaj khov.
Hloov tau
Broadband kis tau tus mob thev naus laus zis tuaj yeem hloov mus rau qhov sib txawv network ib puag ncig thiab cov ntaub ntawv xa mus, suav nrog kev xa xov thiab wireless, pej xeem network thiab ntiag tug network, thiab lwm yam, thiab muaj ntau yam kev siv.
Nyob rau hauv luv luv, raws li ib tug high-ceev ceev, loj-muaj peev xwm cov ntaub ntawv kis tau tus mob technology, broadband kis tau tus mob technology muaj peev xwm paub sib xyaw kis tau tus mob ntawm ntau yam sib txawv ntawm cov teeb liab nyob rau hauv tib yam kev sib txuas lus nruab nrab, thiab muaj dav daim ntawv thov kev cia siab thiab kev ua lag luam xav tau.Txoj kev loj hlob ntawm broadband kis tau tus mob thev naus laus zis muab cov neeg tuaj yeem ceev, ruaj khov thiab muaj txiaj ntsig cov ntaub ntawv sib kis, thiab tuaj yeem txhim kho qhov zoo thiab kev ruaj ntseg ntawm lub network.
2.4 Disadvantages ntawm Broadband
1. Tus nqi ntawm cov cuab yeej siv yog siab, thiab ntau cov nyiaj yuav tsum tau nqis peev hauv kev tsim kho thiab kho.
2. Thaum lub network infrastructure hauv qee qhov chaw tsis txaus, kev xa xov broadband yuav raug cuam tshuam.
3. Rau qee tus neeg siv, qhov bandwidth loj dhau, uas yog kev siv nyiaj pov tseg.
Feem ntau, nqaim thiab broadband txhua tus muaj lawv tus kheej cov xwm txheej thiab qhov zoo thiab qhov tsis zoo.Thaum xaiv txoj kev sib txuas lus, nws yuav tsum raug xaiv raws li qhov xav tau tiag tiag.
Kev cia siab rau nws qhov tshwj xeeb zoo ntawm kev sib txuas lus tsis sib xws, cov khoom lag luam uas tsis yog lub hauv paus ntawm nws tus kheej lub network tau maj mam dhau los ua ib feem ntawm kev sib txuas lus thaum muaj xwm txheej ceev thiab ua lub luag haujlwm tseem ceeb.Qhov txawv ntawm qhov kev pom, qhov tsis yog nruab nrab ad hoc network technology tuaj yeem muab faib ua "narrowband ad hoc network technology" thiab "broadband ad hoc network technology".
3.1Narrowband Ad Hoc Network Technology
Sawv cev los ntawm lub suab sib txuas lus, cov channel sib nrug ntawm 12.5kHz thiab 25kHz feem ntau yog siv los nqa cov ntaub ntawv, uas tuaj yeem txhawb nqa cov ntaub ntawv ceev ceev xws li lub suab, cov ntaub ntawv sensor, thiab lwm yam (qee qhov tseem txhawb nqa cov duab xa mus).Narrowband ad hoc network thev naus laus zis kuj feem ntau siv hauv lub suab sib txuas lus hauv cov khoom sib txuas lus thaum muaj xwm ceev.Nws qhov zoo yog qhov tseeb, xws li siv cov khoom siv zaus, txuag cov peev txheej spectrum, thiab yooj yim davhlau ya nyob twg roaming;Kev pab cuam hauv cheeb tsam tau ua tiav los ntawm ntau qhov kev sib txuas;Tsis tas yuav tsum muaj kev sib txuas hauv lub network, thiab kev xa tawm yog hloov tau thiab nrawm.
3.2Broadband Ad Hoc Network Technology
Lub tswvyim ntawm routing yog ib tug yam ntxwv ntawm broadband ad hoc network technology, uas yog, nodes muaj peev xwm xa cov ntaub ntawv nyob rau hauv lub network raws li lub hom phiaj (unicast los yog multicast).Txawm hais tias qhov kev pab cuam ntawm broadband ad hoc network yog qis dua qhov nqaim, nws qhov kev txhawb nqa rau cov ntaub ntawv loj (xws li lub sijhawm video thiab lub suab xa mus) yog tus yuam sij rau nws lub neej.Broadband ad hoc network technology feem ntau muaj bandwidth siab ntawm 2MHz thiab siab dua.Ntxiv mus, nrog rau qhov kev thov ntau ntxiv rau digitization, IP thiab kev pom, broadband ad hoc network technology kuj yog ib feem tseem ceeb ntawm kev sib txuas lus xwm txheej ceev.
IWAVE kev sib txuas lusmuaj kev ywj pheej kev tshawb fawb thiab kev loj hlob pab neeg thiab tau tsim ib tug series ntawm high-bandwidth MESH non-central ad hoc network khoom, uas muaj peev xwm xa video thiab kev sib txuas lus wirelessly nyob rau hauv ntev kev deb, thiab yog dav siv nyob rau hauv kev tiv thaiv hluav taws, saib xyuas, cawm thaum muaj xwm ceev, thiab niaj hnub siv tswv yim siv.Thiab lwm qhov chaw, muaj kev ua tau zoo heev.
Post lub sij hawm: Sep-08-2023
