Xaiv lus
Ib qho kho qhov muag transciver, qee zaum hu ua cov fiber ntau transcient, yog ib qho kev sib tshuam uas muaj peev xwm kis tau thiab tau txais cov ntaub ntawv. Nws muaj ob ntu tseem ceeb: lub transmitter thiab tus txais. Qhov kev tiv thaiv no siv cov tshuab thev naus laus zis siv hluav taws xob fiber ntau thev naus laus zis rau cov cim hluav taws xob rau lub teeb liab thiab lwm tus.
Fiber ntau hom
Tej zaum feem ntau ntawm kev faib tawm ntau tshaj plaws ntawm fiber ntau optic transceivers yog "hom hom" ntawm cov fiber ntau nrog uas nws yog npaj los siv. Ob qhov kev qhia yooj yim ntawm Fiber Fiber hom yog: multimode thiab singlemode. Ntau cov pej xeem muaj ntau, nrog cov tub ntxhais diameters feem ntau nyob rau hauv thaj tsam ntawm 50 txog 62,5 microdary tub ntxhais kawm cov kab ke, uas muaj cov tseem ceeb tshaj plaws hauv 8 txog 9 micron ntau.
Ntau cov cawv, nrog lawv qhov loj dua qub aperture, pub ntau hom ntawm lub teeb rau ob peb mus rau hauv cov fiber. Cov qauv ntau yam ntawm lub teeb sib txawv ntawm kev sib txawv me ntsis thaum lawv taug kev hauv cov fiber. Qhov tshwm sim yog 'kis' kis tau 'ntawm cov pulses raug xa mus ua modal dispersion. Hom kev sib txuam no tshwj xeeb txwv tsis pub tshaj tawm cov kev sib kis mus deb dhau ntawm cov pa roj multimode raws li kev sib piv nrog singlemode fiber ntau. Txij li thaum cov ntawv thov muaj kev sib txuas lus luv luv, kev xa khoom tawg heev thiab cov neeg tau txais khoom siv feem ntau yog siv ntau qhov transces transcceivers. Yog li, thaum ntau fiber nws tus kheej nws tsis muaj qhov sib txawv hauv cov neeg tshaj li hauv Singlemode yog feem ntau ib feem ntawm tus nqi ntawm Singlemode cov uas.
HLOOV HLOOV
Fiber ntau Optic Transceival Transce yog feem ntau categorized raws li lawv cov ntaub ntawv hloov tsheb. Muaj tsib pawg nrov pawg tau siv hauv Fiber Optic TransceVer (100gbase, 40GBase, 10000Base, 1000base thiab 100base. Cov nqi no xa mus rau qhov nrawm ntawm uas muaj fiber ntau optic transcer muaj peev xwm los xa cov ntaub ntawv hla eternet. Muaj ntau tus naj npawb ntawm lwm tus nqi hloov pauv uas cuam tshuam nrog qee yam kev ua lag luam. Cov nqi lag luam nrov rau cov fiber ntau channel, keeb kwm siv rau kev kub ceev supercomputer sib txuas thiab chaw cia khoom, 2Gbps, 4Gbps, thiab 16Gbps. Cov xov tooj sib txuas xov tooj tau siv cov sonet \/ SDH multiplexing hierarchy rau ntau xyoo nrog kev sib kis kho qhov muag, 622gbps, 9.953gbps thiab 3913gbps.
Kev Sib Kis
Tsis yog tag nrho cov fiber ntau optic transceiver modules tuaj yeem xa cov ntaub ntawv tib qho kev ncua deb. Raws li tau hais los saum toj no, ib qho tseem ceeb sib txawv yog multimode piv rau kev hloov pauv mus rau Singlemode. Rau cov kev siv multimde, ob qho tib si hloov tus nqi thiab hom fiber ntau cuam tshuam rau kev sib nrug. Rau cov ntawv thov SingLemode, hloov tus nqi yog qhov tseem ceeb tshaj plaws nrog kev hwm rau kev sib nrug. Cov kev siv multimde feem ntau tau cais raws li "luv mus txog", feem ntau nrog cov nomenclature "(laus dua 100mbps siv" FX "thiab 1Gbps TransceCEater Muaj ntau cov transsisde transce greeded li "ntev ntau ntau ntau" lossis "LRM" txhawb nqa cov chaw muag khoom me ntsis ntev dua li SR ntxiv ntev dua li cov qauv luv luv.
Lub paj
Infrared lub teeb yog siv nyob rau hauv kev sib kis cov ntaub ntawv ntawm fiber ntau optic tes hauj lwm. Ib nthwv cua yog qhov ntsuas ntawm qhov kev ncua deb ntawm kev ua tiav ntawm cov crests ntawm lub teeb yoj. Fiber ntau Optic Transceiver Modules feem ntau xa cov ntaub ntawv ntawm ib ntawm peb lub wavelengths: 850nm, 1310nm lossis 1550nm. Cov laj thawj rau cov muaj koob meej ntawm peb wavelengths yog ob peb lub ntsej muag: 1) Fiber optic delenuation yog qhov qis dua ntawm cov wavelengths no; thiab 2) Asmeskas Lub Koom Haum Asmeskas ntawm cov qauv thiab thev naus laus zis (nist) muab ntsuas ntsuas ntsuas ntsuas rau kev sim fiber ntau optics ntawm cov wavelengths. Multimode fiber ntau yog tsim los ua haujlwm ntawm 850nm wavelengths, thaum singlemode fiber ntau yog qhov zoo rau 1310NM wavelengths. Hauv Singlemode Domain, cov qhab nia finer yog tau nyob rau hauv ob qho 1310nm thiab 1550nm 'winve' siv precision ua transmitters. Qhov ob feem ntau cov qauv thiab qauv qauv yog CWDM (coarse wavelength divenas) thiab dwdm (ntom wavelength divisTaw).
Nyob rau hauv ob qho tib si CWDM thiab DWDM systems, transcercers, txhua transmitting ntawm lawv lub nthwv dej tshwj xeeb, txuas nrog wavelength division multural. Cov cuab yeej siv no ua ke thiab cais ntau yam wavelength (lossis xim) ntawm lub teeb mus \/ tawm ntawm ib khub fiber ntau. CWDM cov tshuab zoo li yuav nrov thiab muaj txiaj ntsig zoo nyob rau hauv cov xwm txheej uas tus naj npawb ntawm fiber ntau cov strands yog txwv thiab ntxiv cov fiber ntau yog kim, txawm tias thaum nyob deb yog tsis tshwj xeeb ntev. Nyob rau hauv ntev ntev lub system uas lub kaw lus yuav tsum tau nthuav dav thiab dispersion them nyiaj ntau zaus, DWDM tau dav siv. Erbium doped fiber ntau tshaj plaws (EDFAS) thiab kev faib cov nyiaj them rau txhua tus, tsis tas yuav tsum dewdm raws ib zaug, tsis tas yuav tsum tau ua kom tiav txhua channel txhua 80km lossis li ntawd.
Connector Hom
Kev siv kho qhov muag siv tau kho qhov muag ob peb thiab cov transign transceivers kom lub teeb tau dhau los ntawm cov tub ntxhais. Transceiver modules tuaj yeem raug cais ua cov pab pawg sib txawv raws lawv hom txuas. Muaj plaub lub ntsiab nta ntawm fiber ntau cov pob hluav taws xob txuas nrog nrog kev kho kho tsis zoo nrog hnub no: sc, MPO, thiab ST. Feem ntau qhov kev hloov kho kho qhov muag siv duplex txuas, ib qho rau kis thiab ib qho kom tau txais. Muaj bi-directional (Bidi) Transceiversivers uas tau xa mus ua khub nrog txhua tus zaum kawg ntawm lub wavelength (piv txwv li, 1310nm). Txhua Bidi Transport nrog 2- channel wavele} channel wavelength divacision cais \/ ua ke ob wavelengths. Rau cov qsfp tshiab thiab siv Modules txuas ntxiv, muaj tsuas yog ib qho txuas ntxiv tab sis, raws li tau piav qhia nyob rau hauv lub rooj saum toj no, uas tau piav qhia los cais transmitters \/ tau txais nyob rau hauv lub qhov muag transcaliver.
Cov Ntawv Thov ntawm 10G Optical Transceage
10g Kho qhov muag kho kho qhov muag tsuas yog suav nrog SFP + Cov Qauv Kho Mob thiab XFP kho qhov muag. XFP kho qhov muag yog qhov loj dua vim tias nws tau tshwm sim ua ntej lawm, thiab muaj tus nqi qis dua tshiab, thiab muaj tus nqi qis, loj me me, thiab sib xyaw. Nws tau siv dav hauv cov ntaub ntawv centre network vim nws qhov kev ua tau zoo thiab lwm yam zoo. Niaj hnub no, 10G Network Technology thiab kev ua lag luam yog paub tab, thiab kev daws rau 10g cov ntaub ntawv chaw feem ntau yog 10g hloov nrog SFP {} g optical modules. Lub 10g optical module xa cov cim cov cim los ntawm cov duab kho kho tshiab, muab kev ceev, cov ntaub ntawv siab-muaj peev xwm. Txawm hais tias nyob rau hauv ib cheeb tsam network (LAN) lossis thaj chaw dav dav (WAN), 10g kho qhov muag tuaj yeem ua tau rau qhov kev thov siab thiab cov ntaub ntawv muaj peev xwm loj.
Cov ntawv thov ntawm 40g kho qhov muag transceivers
Cov khoom siv ntim khoom tam sim no ntawm 40g optical transceivers yog qsfp +. Qhov no Compact Kub-Swappable Optical Optical Module muaj 4G-ettern, thiab lwm cov qauv, nws tau ua raws li kev ua lag luam siab thiab kev kub ceev.
Cov ntawv thov ntawm 100g kho qhov muag transceivers
Lub pob loj ntawm 100g optical transceiver yog qsfp28. Lub qsfp28 kho qhov muag Transcuply txhawb nqa 4 × 25G cov ntaub ntawv sib kis hom, thiab tus nqi qis, nws yog tus nqi qis, nws yog tus neeg siv cov ntaub ntawv. 100g kho qhov muag yog siv los txuas huab servers, virtual machine thiab network ua tiav cov ntaub ntawv xa tawm thiab kev sib txuas tau sib txuas. Nws yog dav siv nyob rau hauv cov chaw zov me nyuam, Telecom cov neeg ua haujlwm, huab xam phaj thiab lwm cov teb uas xav tau cov ntaub ntawv muaj peev xwm loj thiab muaj kev sib txuas nrawm.
Cov hloov kho kho kho qhov muag ua haujlwm ntawm txheej ntawm lub cev ntawm tus qauv OSI thiab yog ib qho tseem ceeb ntawm cov khoom sib txuas lus kho tau. Nws yog tsuas yog tsim Optoelectronic khoom (transmicterters, kho kho qhov muag), kev sib tw ua haujlwm zoo, thiab kho qhov muag. Nws lub ntsiab muaj nuj nqi yog kom paub txog kev hloov pauv hloov pauv hloov tshiab thiab electro-optical hloov dua tshiab ua haujlwm nyob rau hauv kev sib txuas lus kho tshuab.
Kev xa cov interface kev tawm tswv yim nrog qee qhov kev coj ua, thiab tom qab ua tiav cov teeb meem tsav tsheb sab hauv Tom qab kis tau tus mob fiber ntau, kev txais interface xa cov paib hluav taws xob nws tau hloov pauv mus rau hauv cov cim hluav taws xob uas muaj kev tso zis tom qab dhau los ntawm kev ua kom muaj txiaj ntsig.
Xaiv koj lub wavelength
Nyob rau hauv fiber ntau, nthwv dej yog ib qho ntawm cov kev txwv feem ntau. Lub wavelength yuav hnyav kev cuam tshuam kev nrawm ntawm lub system, qhov ntau nws tuaj yeem npog, dab tsi kho vajtse tau tshaj thiab lwm yam ntawm kev tsim qauv. Qhov kev txiav txim siab no pib nrog tos koj lub wavelength; Txhua tsav txhua yam ua raws tom qab. Feem ntau hais lus luv, luv luv wavelengths tuaj yeem ntaus nrawm dua, tab sis wavelengths ntev tuaj yeem nqa lub teeb liab kom deb dua. Txhawm rau kom koj tau pib hauv txoj kev ntawd, koj tuaj yeem xav txog peb txoj kev yoj yoj uas tseem ceeb tshaj plaws thiab lawv cuam tshuam ntau npaum li cas.
● 850NM cov cim tsuas yog mus ib ncig 500m.
● 1310nm cim tau tuaj yeem nce txog 40km nyob deb li cas.
● 1550nm cim tau tshaj 40km.
Kuaj xyuas ntawm kev sib raug zoo
Muaj ob peb qhov sib txawv ntawm kev sib txawv uas koj yuav tsum xav txog koj txoj kev hloov tsheb. Thawj zaug, thiab feem ntau yooj yim tshaj plaws, yog daim ntawv Factor. Cov cables ntsaws rau hauv transceiver? Muaj ntau hom qauv tsim muaj rau cov laj thawj sib txawv. Kuj tseem muaj qhov teeb meem ntawm OEM compatibility. Txhua tus chaw tsim khoom tuaj yeem siv nws tus kheej cov phiajcim ntawm lub kaw lus. Yog li, xyuas kom meej tias koj tau txais cov khoom siv uas tau tshaj yog qhov koj twb muaj lawm.
Lwm cov lus nug muab lus nug:
● Koj puas xav tau kev hloov pauv kub-swappable?
Koj puas xav tau LC, sc, MPO, RJ -45}, lossis lwm yam txuas?
Koj puas xav tau tus eternet \/ tooj liab transceiver lossis fiber ntau transceiver?
● Dab tsi yog qhov tsawg kawg fiber ntau hom uas koj xav tau? OM3, OM4, OS2, MPO, thiab lwm yam?
Txiav txim siab nrawm
Kev ceev yog qhov kev txhawj xeeb loj. Thaum nws los txog rau fiber ntau optics, koj tuaj yeem tau txais cov tes hauj lwm uas yog qhov yooj yim heev, tab sis lawv tsis pheej yig. Ib yam li ntawd, yog tias koj sim kom txuag tau nyiaj, kev txi nrawm yog ib txoj hauv kev yooj yim rau cov nqi qis. Cov ntaub ntawv twg koj xav tau rau koj lub network ua haujlwm? Koj yuav tsum teb cov lus nug no ua ntej. Tom qab ntawd, koj xav xav txog lub neej tom ntej thiab koj cov ntaub ntawv cov ntaub ntawv yuav loj hlob nyob rau lub sijhawm. Thaum koj xav txog ob yam ntawm cov ntaub ntawv tus nqi, koj tuaj yeem xaiv txoj kev transceiver. Cov ntaub ntawv ntau dua tsis txhais tau tias yog kev sib txuas zoo dua. Ntsuas koj cov kev ua tau zoo network xav tau thiab xav tau nrog tus nqi \/ peev nyiaj tseem ceeb dua. Thaum muaj ntau yam kev hloov pauv tawm uas muaj peev xwm lis cov ntaub ntawv feem ntau siv, qhov nrov tshaj plaws siv transceivers feem ntau nyob rau hauv cov ntaub ntawv ntsuas cov ntaub ntawv:
● 1 Gbps
● 10 Gbps
● 25 Gbps
● 40 Gbps
● 100 GBPS
Xav txog ntau yam
Lub teeb liab mus deb npaum li cas? Koj twb tau txiav txim siab ntau me ntsis thaum koj khaws koj lub wavelength, tab sis muaj ntau rau kab zauv. Ib hom-hom (smf) vs ntau hom fiber ntau (hli) cuam tshuam ntau yam. Ib hom fiber ntau muaj ntau tus nqi siab dua ntawm cov nqi siab dua, thaum ntau cov fiber ntau yog qhov zoo dua hauv tus nqi muaj peev xwm ntau dua. Puas yog koj txoj hlua cable ntawm cov paib lossis pob txha? Tsis tas li, dab tsi max nrug yog koj opic rated rau? Cov no yog cov lus nug tseem ceeb uas yuav tswj hwm ntau yam ntawm koj qhov kev txiav txim siab. Pairing sab xis optic, nrog txoj cai cabling kom ua tiav cov khoom siv tau zoo thiab ruaj khov rau koj cov ntaub ntawv yog qhov tseem ceeb ntawm lub hnub.
Paub koj ib puag ncig
Fiber networks ua haujlwm hauv txhua yam ntawm ib puag ncig. Ib qho chaw khaws ntaub ntawv yog qhov sib txawv los ntawm kev saib xyuas kev saib xyuas sab nraud, thiab tsis muaj ntau yam nrog kev lag luam tsim khoom. Yog li, puas yog koj cov xov xwm fiber ntau khiav los ntawm phab ntsa? Puas yog lawv pw hauv av? Los yog, lawv tsuas yog khiav ntawm ib lub cuab yeej mus rau lwm chav nyob hauv tib chav? Nws tau txais npaum li cas? Puas muaj corrosive ntsiab? Koj puas txhawj xeeb txog hmoov av lossis dej? Muaj ntau cov kev txhawj xeeb ib puag ncig, thiab koj yuav tsum tau muab lawv txhua tus. Qhov loj tshaj plaws yog tus nqi kub, uas yog subdivided ua ob qho kev ua haujlwm ntsuas kub:
Aggermers Kev Lag Luam Transcea - Cov Haujlwm Ua Haujlwm Yooj Yim: {0 - 70 degree c \/ 32 - 158 degree f
● Cov kev hloov transce - yooj yim ua haujlwm temp: -40 - 85 degree c \/ -40 - 185 degree f
Koj txoj kev hloov pauv yuav tsum tau ntsuas ua haujlwm hauv nws ib puag ncig. Yog tias koj tab tom ua haujlwm hauv qhov chaw hnyav, yuav muaj kev xav tau cov khoom siv ruaj khov rau cov khoom siv ruaj khov, tab sis nws tsis tuaj yeem them nyiaj rau koj cov peev txheej.
Cov lus qhia rau kev kho qhov muag transce
Tiv thaiv cov esd kev puas tsuaj
Kev tawm hluav taws xob hluav taws xob tuaj yeem ua rau kev puas tsuaj rau cov khoom siv rhiab ntawm koj tus kab mob hloov kho kho qhov muag, yog li nws yog qhov tseem ceeb kom ua kev ntsuas kom tiv thaiv nws. Siv hnab looj tes qub thaum ua haujlwm nrog kev hloov pauv, thiab hnav cov kab mob los tiv thaiv caj dab yog tias ua tau.
Siv cov khoom tau zoo fiber ntau thaj thiab fiber ntau cable
Nws yog qhov tseem ceeb rau kev siv zoo optical fiber ntau thaj cables thiab fiber ntau cables nrog koj transceivers los xyuas kom meej saib optical network kev ua tau zoo. Koj tuaj yeem txo cov kab mob hauv kev ua kom zoo thiab kho qhov muag tsis zoo los ntawm kev siv cov khoom siv zoo thiab ua kom koj lub network ua haujlwm zoo.
Tsis txhob yuam kev ntsaws thiab tshem tawm cov kho qhov muag transciver
Thaum sib txuas los yog txiav tawm qhov kho qhov muag transce, yuav tsum ceev faj kom tsis txhob ua rau kev puas tsuaj kho qhov muag. Yuam kev kho qhov muag transcer rau hauv qhov chaw tuaj yeem ua rau kev puas tsuaj rau lub tshuab kho kho kom zoo thiab ua rau koj cov kev ua tau zoo ntawm koj lub network kho qhov muag. Yuav tsum tau ceev faj thaum ntsaws rau hauv lossis tsis hloov koj qhov kev kho kho kho qhov muag.
Npog cov hmoov av npog thaum lub transceiver tsis siv
Khaws cov hmoov av npog nyob rau hauv qhov chaw thaum tsis siv plua plav thiab lwm cov khib nyiab los ntawm kev nkag mus rau hauv qhov muag transcaler. Ib qho kev ua kom tsis yog kho dua tshiab tuaj yeem ua rau lub teeb liab optical poob thiab thaum kawg ua rau muaj teeb meem network.
Khaws cov fiber ntau-ntsej muag huv si
Nws yog qhov tseem ceeb heev rau kom kawg-ntsej muag ntawm cov kho qhov muag transce los tswj hwm qhov kev sib txuas zoo kho qhov muag. Lub ntsej muag kho qhov muag tau tuaj yeem txhaws nrog grit, plua plav, thiab lwm cov khib nyiab, uas yuav txo cov teeb liab kho qhov muag. Khaws cov fiber ntau kawg ntsej muag huv txhua lub sijhawm. Tom qab ntawd yog tias lub ntsej muag kawg yog qias neeg lossis puas, siv lub tshuab nqus tsev ntxhua khaub ncaws lossis cov tshuab kho qhov muag tsis zoo los, lossis tsuas yog hloov kho qhov tshiab transceiver.
Bidi kho qhov muag transceivers yuav tsum tau siv los ua khub
Yog tias koj siv Bidi Optical transceivers, nws yog qhov tseem ceeb los siv lawv ua khub. Tsis zoo li ib txwm Duplex Transceer, Bidi TransceVeral sib txawv ntawm lub chaw xa hluav taws xob thiab cov chaw nres nkoj kho qhov muag. Raws li qhov tshwm sim, lawv tsis tuaj yeem siv nrog lwm txoj kev hloov kho kho qhov muag tshwj tsis yog lawv yog tus qub hom.
Xyuas kom meej transceiver
Qee qhov kev hloov pauv lub zog hloov lub platform hloov pauv lub transceiver thiab tiv thaiv tus qauv transceiver los ntawm kev siv. Hauv lwm lo lus, tus kho qhov muag transcer tau "xauv-coded" thiab tsuas yog siv nrog qhov kev hloov ntawd tshwj xeeb. Raws li qhov tshwm sim, nws yog ib qho tseem ceeb kom kuaj xyuas qhov muag transceiver ua ntej yuav khoom. Piv txwv koj xav siv lub rooj sib tham thib peb ntawm kev hloov kho tshiab nrog koj tus hloov. Nyob rau hauv cov ntaub ntawv ntawd, koj yuav tsum tau xyuas nrog lub tshuab muag khoom kho kho kho tshiab los saib seb lawv puas muab daim ntawv theej tawm rau lub qhov muag hloov kho kho tshiab.
Nco ntsoov tias cov zauv xaim xaim cable haum koj transceiver
Koj yuav tsum xyuas kom meej tias lub ntsuas hluav taws xob siv hluav taws xob sib xyaw haum rau koj tus kab mob transcector. Lub multimode Transceiver tsuas txhawb qhov kev sib kis tau muaj ntau-hom optical transcerent tsuas yog ua haujlwm nrog ib-hom optical fiber ntau. Yog li ntawd, ua kom lub qhov muag fiber ntau cable haum koj kho qhov muag transceiver tseem ceeb heev.
Siv tus attenty deluenator kom tsis txhob muaj cov neeg tau txais kev tshaj plaws thiab puas
Qee qhov kev hloov mus ntev-ntev-designivers muaj zog rau cov khoom siv hluav taws xob uas dhau lawm rau cov khoom sib txuas. Raws li qhov tshwm sim, rau kev sib txuas luv, koj yuav siv tus saib xyuas tus saib xyuas kom txo qis lub zog kho qhov muag thiab tiv thaiv koj tus txais kev kho qhov muag puas los ntawm kev puas.
Tsis txhob saib ncaj qha rau cov chaw nres nkoj fiber ntau
Thaum lub sij hawm kho qhov muag hloov tau, thaum lub qhov muag hloov kho tshiab yog ua haujlwm, muaj lub teeb ci ntsa iab tawm los ntawm qhov chaw nres nkoj ntawm qhov muag. Tsis txhob saib mus rau hauv qhov chaw nres nkoj ntawm qhov muag ncaj qha nrog koj lub qhov muag, zoo li qhov no yuav ua rau koj lub qhov muag mob.
Txog tam sim no, FB-txuas tau txais dhau 65 patents rau kev tsim muaj, thiab ntau dua 90 cov software software. Nws tau dhau los ua National High-tech Enterprise. Ib qho ntxiv, nws tau txais cov nyiaj tsim kho cov nyiaj ua haujlwm hauv tebchaws hauv kev ruaj ntseg hauv internet ntau zaug.
FB-txuas muaj cov pab pawg ua ke nrog kev tsim muaj zog, kev tswj hwm kev txhim kho, CSPs, Cable MSOs, thiab cov lag luam loj. Cov kws tshaj lij muaj peev xwm muab tau cov kev daws teeb meem ib qho xws li kev xa tawm ntawm lub xaib.
Raws li ib qho ntawm cov thawj coj ntawm kev tsim kho qhov muag thiab cov neeg muag khoom hauv Suav teb, peb sov siab txais tos koj rau kev lag luam wholesale lossis yuav cov kev ntsuas kho kho qhov muag ntawm Tshuag no los ntawm peb lub hoobkas. Txhua cov khoom lag luam customized yog nrog cov khoom zoo thiab cov nqi sib tw. Tiv tauj peb rau cov qauv thiab cov qauv dawb.
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