ONUtxhais
ONU (Optical Network Unit) hu ua optical network unit thiab yog ib qho ntawm cov khoom siv tseem ceeb hauv optical fiber access network (FTTH). Nws nyob ntawm tus neeg siv kawg thiab yog lub luag haujlwm rau kev hloov kho qhov muag teeb liab rau hauv cov teeb liab hluav taws xob thiab ua cov teeb liab hluav taws xob rau hauv cov ntaub ntawv xa tawm cov ntaub ntawv kom ua tiav cov ntaub ntawv ceev ceev rau cov neeg siv.
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1.ONU ntaus ntawv ua haujlwm
CovONUntaus ntawv muaj cov haujlwm hauv qab no:
Lub cev muaj nuj nqi: ONU ntaus ntawv muaj kev hloov kho qhov muag / hluav taws xob ua haujlwm, uas tuaj yeem hloov qhov tau txais cov teeb liab kho qhov muag mus rau hauv lub teeb liab hluav taws xob, thiab tib lub sijhawm hloov cov teeb liab hluav taws xob rau hauv qhov hluav taws xob teeb liab rau kev sib kis.
Logical Function: CovONUntaus ntawv muaj ib tug aggregation muaj nuj nqi, uas yuav aggregate cov low-speed data kwj ntawm ntau tus neeg siv mus rau ib tug high-ceev cov ntaub ntawv kwj. Nws kuj muaj cov txheej txheem hloov dua siab tshiab, uas tuaj yeem hloov cov ntaub ntawv ntws mus rau hauv cov qauv tsim nyog rau kev sib kis.
2.ONU raws tu qauv
ONUCov cuab yeej txhawb nqa ntau yam kev cai, suav nrog Ethernet raws tu qauv, IP raws tu qauv, txheej txheej txheej txheem, thiab lwm yam, raws li hauv qab no:
Ethernet raws tu qauv: ONU cov cuab yeej txhawb nqa Ethernet raws tu qauv thiab tuaj yeem paub cov ntaub ntawv encapsulation, kis tau tus mob thiab decapsulation.
IP raws tu qauv: ONU cov cuab yeej txhawb nqa IP raws tu qauv thiab tuaj yeem paub cov ntaub ntawv encapsulation, kis tau tus mob thiab decapsulation.
Lub cev txheej txheem txheej txheem: ONU cov cuab yeej txhawb nqa ntau yam txheej txheem txheej txheem, xws liPEB, GPON, thiab lwm yam, uas tuaj yeem paub qhov kis tau tus mob thiab hloov kho thiab demodulation ntawm optical signals.
3.ONU txheej txheem sau npe
Cov txheej txheem sau npe ntawm ONU cov cuab yeej suav nrog kev sau npe thawj zaug, kev sau npe raws sij hawm, tshwj xeeb tuav, thiab lwm yam, raws li hauv qab no:
Kev sau npe pib: Thaum ONU ntaus ntawv tau qhib thiab pib, nws yuav pib thiab sau npe los ntawmOLT(Optical Line Terminal) ntaus ntawv los ua kom tiav qhov kev ntsuas tus kheej thiab kev teeb tsa ntawm lub cuab yeej.
Kev sau npe ib ntus: Thaum lub sijhawm ua haujlwm ib txwm muaj, ONU ntaus ntawv yuav xa cov ntawv thov rau npe mus rau OLT ntaus ntawv txhawm rau tswj kev sib txuas lus nrog OLT ntaus ntawv.
Tshwj xeeb tuav: Thaum ONU ntaus ntawv pom qhov txawv txav, xws li network tsis ua haujlwm, txuas tsis ua haujlwm, thiab lwm yam, nws yuav xa cov ntaub ntawv ceeb toom rauOLTntaus ntawv los pab daws teeb meem raws sij hawm.
4.ONU cov ntaub ntawv kis txoj kev
Cov ntaub ntawv kis tau tus mob ntawm ONU cov cuab yeej suav nrog kev sib kis ntawm analog thiab digital signals nrog rau cov teeb liab hloov kho thiab demodulation, raws li hauv qab no:
Analog signal kis tau tus mob: ONU ntaus ntawv xa tus neeg siv lub suab, yees duab thiab lwm yam ntaub ntawv analog mus rau tus neeg siv-kawg ntaus ntawv los ntawm analog teeb liab kis tau tus mob.
Cov teeb liab kis tau tus mob: ONU cov cuab yeej xa cov neeg siv cov ntaub ntawv digital mus rau tus neeg siv khoom siv los ntawm kev xa cov teeb liab digital. Digital signals yuav tsum tau encoded ua ntej kis tau tus mob. Cov txheej txheem encoding feem ntau suav nrog ASCII code, binary code, thiab lwm yam.
Lub teeb liab kev hloov pauv thiab demodulation: Thaum lub sijhawm xa cov teeb liab digital, ONU cov cuab yeej xav tau hloov kho cov teeb liab digital thiab hloov cov teeb liab digital rau hauv cov teeb liab tsim tsim rau kev sib kis hauv cov channel, xws li Ethernet cov ntaub ntawv thav ntawv. Nyob rau tib lub sijhawm, ONU ntaus ntawv kuj yuav tsum tau demodulate lub teeb liab tau txais thiab hloov lub teeb liab rov qab mus rau qhov qub digital teeb liab hom.
5.Kev sib tham ntawm ONU thiab OLT
Kev sib cuam tshuam ntawm ONU cov cuab yeej thiab OLT cov cuab yeej suav nrog cov ntaub ntawv xa mus thiab tswj cov lej ua haujlwm, raws li hauv qab no:
Kev xa cov ntaub ntawv: Cov ntaub ntawv xa mus yog ua los ntawm ONU cov cuab yeej thiab OLT cov cuab yeej los ntawm cov khoom siv kho qhov muag. Nyob rau hauv qhov kev taw qhia saum toj kawg nkaus, ONU ntaus ntawv xa tus neeg siv cov ntaub ntawv mus rau OLT ntaus ntawv; nyob rau hauv qhov kev taw qhia downstream, OLT ntaus ntawv xa cov ntaub ntawv mus rau ONU ntaus ntawv.
Tswj tus lej ua: Synchronous kis ntawm cov ntaub ntawv yog pom tau hais tias ntawm ONU ntaus ntawv thiab OLT ntaus ntawv los ntawm kev tswj tus lej ua. Cov ntaub ntawv xov tooj tswj suav nrog cov ntaub ntawv teev, tswj cov lus qhia, thiab lwm yam. Tom qab tau txais cov ntaub ntawv tswj tus lej, ONU ntaus ntawv yuav ua cov haujlwm sib raug raws li cov lus qhia, xws li cov ntaub ntawv xa thiab txais, thiab lwm yam.
6.ONU kev saib xyuas thiab kev tswj xyuas
Txhawm rau kom ntseeg tau tias kev ua haujlwm ib txwm muaj ntawm ONU cov cuab yeej, kev saib xyuas thiab kev tswj hwm yuav tsum tau ua, raws li hauv qab no:
Kev daws teeb meem: Thaum ONU ntaus ntawv ua tsis tiav, kev daws teeb meem yuav tsum tau ua raws sijhawm. Feem ntau cov faults muaj xws li fais fab mov tsis ua hauj lwm, optical path tsis ua hauj lwm, network tsis ua hauj lwm, thiab lwm yam. Cov neeg ua hauj lwm saib xyuas yuav tsum tau xyuas cov xwm txheej ntawm cov khoom raws sij hawm, txiav txim seb hom kev txhaum thiab kho nws.
Kev hloov pauv Parameter: Txhawm rau kom ntseeg tau tias kev ua haujlwm ntawm lub cuab yeej thiab kev ruaj ntseg ntawm lub network, qhov tsis muaj ntawm ONU ntaus ntawv yuav tsum tau kho. Cov kev hloov pauv muaj xws li optical fais fab, xa hluav taws xob, tau txais rhiab heev, thiab lwm yam. Cov neeg ua haujlwm tu yuav tsum tau hloov kho raws li qhov xwm txheej tiag tiag kom ntseeg tau tias cov khoom siv ua haujlwm li qub.
Kev Tswj Xyuas Kev Ruaj Ntseg: Txhawm rau kom muaj kev ruaj ntseg network, ONU cov cuab yeej yuav tsum tau tswj kom ruaj ntseg. Cov neeg ua haujlwm saib xyuas yuav tsum tau teeb tsa lub cuab yeej kev tso cai ua haujlwm, tswj cov passwords, thiab lwm yam, thiab hloov cov passwords tsis tu ncua. Nyob rau tib lub sijhawm, kev pheej hmoo kev nyab xeeb xws li hacker tawm tsam thiab kis tus kab mob yuav tsum tau tiv thaiv.
Los ntawm kev teeb tsa thiab tswj ONU lub network firewall thiab cov ntaub ntawv encryption muaj nuj nqi, cov neeg siv kev ruaj ntseg network tuaj yeem txhim kho tau zoo thiab tiv thaiv kev tawm tsam network. Thaum ua kom muaj kev ruaj ntseg network, koj kuj yuav tsum tau them sai sai rau kev hloov kho cov cai ruaj ntseg tas li los daws cov teeb meem nyuaj thiab hloov pauv tsis tu ncua.
Post lub sij hawm: Sep-21-2023
