Vim li cas 1 × 32 yog qhov kev xaiv default - thiab qhov twg logic khiav tawm
Lub peev- cov ntaub ntawv siv nyiaj rau 1 × 32 yog qhov tiag. Ib qho chaw nres nkoj OLT, ib qho khoom noj fiber ntau, ib qho splitter, peb caug -ob tus neeg siv khoom. Muab piv rau kev xa tawm ob lub 1 × 16 units: qhov chaw nres nkoj OLT thib ob, qhov thib ob feeder khiav, ntau qhov chaw txee. Ntawm ib qho - tus nqi chaw nres nkoj, 1 × 32 kev xaiv feem ntau tshwm 30–40% pheej yig dua ntawm kab- khoom siv nyiaj ua ntej qhib trench. Rau ib qho kev nthuav tawm npog ntau pua ntawm cov ntsiab lus faib, cov lej lej ntawd ntxiv mus rau qhov sib txawv tseem ceeb.
Cov phiaj xwm network ntxiv qhov kev sib cav thib ob: cov chaw nres nkoj tsis siv ntawm 1 × 32 nqus cov neeg siv khoom yav tom ntej yam tsis muaj chav tshiab. Ib qho puv 1 × 16 yuav tsum muaj lub cuab yeej thib ob, qhov chaw nres nkoj OLT thib ob, thiab lub tsheb thauj khoom. Lub 1 × 32 zoo li nws defers yav tom ntej tus nqi.
Ob qhov kev sib cav tuav - thaum cov nyiaj siv kho qhov muag kuj tuav. Dab tsi ntawm daim ntawv nyiaj txiag tsis tuaj yeem ntes yog qhov chaw kho qhov muag tiag tiag mus thaum nws taug kev los ntawm OLT mus txog 8 km ntawm cov khoom noj khoom haus, los ntawm kev sib tw kaw, los ntawm 1 × 32 splitter, los ntawm FAT adapter, down a drop cable, thiab mus rau ONT receiver thaum sawv ntxov txias thaum lub dav hlau kaw zaum ntawm −3 degree. Txoj kev ntawd ntxiv kev poob uas tsis muaj cov ntaub ntawv xav tau rau koj.
Dab tsi 1 × 32 tus nqi tiag tiag hauv decibels - thiab dab tsi tau ntxiv rau saum
Yog hais tias koj xav tau ib tug refresher ntawm yuav ua li cas splitting poob yog xam los ntawm thawj lub hauv paus ntsiab lus, peb lub ntsiab lus qhia npog tag nrho derivation:Yuav Ua Li Cas Fiber Splitters Ua Haujlwm: Physics, Hom, Poob Nyiaj Txiag & Tsim. Cov qauv luv luv rau lub hom phiaj kev npaj: 1 × 32 phua muaj qhov theoretical pem teb ntawm 15.05 dB, thiab PLC tiag tiag cov khoom siv ntxiv 1.0–2.5 dB ntawm kev poob siab tshaj hauv pem teb - muab qhov siab tshaj qhov poob ntawm 17.5 dB raws li ITU-T G.984 spec.
Tus lej uas tseem ceeb rau kev txiav txim siab xa mus tsis yog hauv pem teb theoretical; nws yog qhov sib kis ntawm cov ntaub ntawv siab tshaj plaws thiab qhov koj tau txais tom qab kev teeb tsa. Lub qhov dej -tsim PLC 1 × 32 chav tsev, tsim nyob rau hauv kev tswj xyuas nrog 100% ib -unit testing, feem ntau thaj av nyob ib ncig ntawm 16.7–16.9 dB txhais tau tias IL - roughly 0.6–0.8 dB hauv qab spec qab nthab. Ib chav tsev cov khoom lag luam uas tsis muaj nyob rau hauv ib qho kev xeem -unit test yuav tuaj txog qhov twg hauv qhov txwv 17.5 dB, lossis qee zaus dhau ntawm nws. Ntawm chav kawm B + txuas nrog 3 dB ntawm kev laus cov npoo, qhov sib txawv yog qhov sib txawv ntawm tus qauv tsim uas muaj hnub nyoog zoo nkauj thiab ib qho uas xav tau kev saib xyuas los ntawm xyoo tsib.
| Split ratio | Theoretical split poob | Hom max IL (spec) | Zoo tshaj - hauv - chav kawm max IL | Uniformity (max) |
|---|---|---|---|---|
| 1×2 | 3.0dB ua | 3.6dB ib | 3.4dB ib | Tsawg dua lossis sib npaug li 0.6 dB |
| 1×4 | 6.0dB ib | 7.4db ua | 7.0dB ib | Tsawg dua lossis sib npaug li 0.8 dB |
| 1×8 | 9.0db ua | 11.0 dB | 10.5 dB | Tsawg dua lossis sib npaug li 1.0 dB |
| 1×16 | 12.0 dB | 14.0 dB | 13.5 dB | Tsawg dua lossis sib npaug li 1.4 dB |
| 1×32 | 15.0 dB | 17.5 dB | 16.8 dB | Tsawg dua lossis sib npaug li 1.9 dB |
| 1×64 | 18.0 dB | 21.0dB ua | 20.5 dB | Tsawg dua lossis sib npaug li 2.5 dB |
Qhov "zoo tshaj-hauv-chav kawm" kab lus tseem ceeb. Ib chav 1 × 32 los ntawm cov chaw tsim khoom ua haujlwm 100% rau ib -unit IL / RL kev sim thiab tswj cov txheej txheem nruj tuaj yeem xa 16.8 dB txhais tau tias qhov poob qis - kwv yees li 0.7 dB hauv qab 17.5 dB spec qab nthab. Qhov ntawd 0.7 dB tsis yog kev lag luam; nws yog engineering headroom. Ntawm 0.35 dB / km ntawm feeder cable nws sawv cev rau ob mais ntxiv ntawm kev ncav cuag, los yog kev nqus ntawm ob qhov marginal teb splices ua ntej pob nyiaj so.
Chav B+ vs C+ - qhov OLT chav kawm hloov pauv li cas
ITU-TG.984 GPON tus qauvtxhais cov chav kawm attenuation uas teev tag nrho cov peev nyiaj tso cai ntawm OLT thiab ONT. Ob chav kawm uas tswj ISP kev yuav khoom yog:
- Chav Kawm B +:13-28 dB tag nrho cov peev nyiaj attenuation (net pob nyiaj: 28 dB)
- Chav Kawm C +:17-32 dB tag nrho cov peev nyiaj attenuation (net pob nyiaj: 32 dB)
Qhov txawv yog 4 dB - uas suab me me kom txog rau thaum koj daim ntawv qhia nws tawm tsam tag nrho cov peev nyiaj txuas. Nov yog ob qho piv txwv ua haujlwm: 1 × 32 kev xa tawm ntawm Chav B + piv rau Chav C +, ob qho tib si ntawm 8 km ntawm feeder cable.
Cov lus no qhia txog qhov kev txiav txim siab uas feem ntau cov lus qhia kev xa mus hla tag nrho:OLT chav kawm tseem ceeb npaum li qhov splitter spec.Ib qho 1 × 32 splitter ntawm chav kawm B + OLT ntawm qhov nruab nrab ntawm cov kab hluav taws xob yog qhov tsim nyog rau hnub ib. Tib lub splitter ntawm chav kawm C + OLT yog kev saib xyuas engineering. Cov cuab yeej zoo ib yam; qhov system ntsiab lus tsis yog.
Qhov twg feem ntau FTTH cov peev nyiaj siv hluav taws xob tau tawg
Yog tias koj tau khiav tom qab kev tuag ntawm txhua qhov txuas FTTH uas ua tsis tau nws cov peev nyiaj poob hauv thawj peb lub xyoos ntawm kev pabcuam, qhov ua rau kev faib tawm yuav zoo li qhov no - raws li daim teb- cov ntaub ntawv pabcuam thiab kev sib tham hauv zej zog engineering los ntawm NANOG, ISE Magazine, thiab cov rooj sab laj ISP ywj pheej:
| Keeb kwm | Kwv yees feem ntawm kev ua tsis tiav | Tej yam dB cuam tshuam |
|---|---|---|
| qias neeg los yog puas APC connector endface | ~40% | 0.5-3.0 dB rau ib lub connector |
| Nruab IL siab dua max spec (inferior splitter) | ~20% | 0.5-2.0 dB |
| Cov nyiaj laus tsis suav nrog hauv cov peev nyiaj tsim | ~15% | 1.5-3.0 dB ntau |
| Field-splice zoo hauv qab qhov kev xav | ~12% | 0.1-0.5 dB rau splice |
| APC / UPC connector mismatch nyob rau hauv nco txoj kev | ~8% | 0.3–1.5 dB + rov qab - poob poob |
| Qhov tseeb fiber ntau cable poob siab dua spec | ~5% | 0.05–0.1 dB/km saum 0.35 |
Tus qauv uas dhia tawm: lub splitter qhov intrinsic insertion poob yog lub luag hauj lwm rau kwv yees li 20% ntawm tsis ua hauj lwm, yuav luag ib txwm vim hais tias ib lub tsev khoom twb sourced yam tsis muaj ib -unit testing thiab nws "1 × 32 Tsawg dua los yog sib npaug rau 17.5 dB" daim ntawv lo zais qhov tseeb ntsia poob ntawm 18.5-19. Lwm 80% ntawm kev ua tsis tiav yog nyob rau hauv txoj kev nyob ib ncig ntawm lub splitter - connectors, splices, design margin, thiab connector{10}}hom mismatches.
Qhov peb poob cov xwm txheej uas tua ntau qhov txuas ntau dua li txhua qhov splitter spec
1. Kev sib kis kab mob ntawm lub splitter pigtail
Cov zis pigtails ntawm 1 × 32 cassette splitter txhua kawg hauv SC / APC connector. Txhua tus ntawm 32 cov khoom sib txuas yog qhov chaw muaj peev xwm kis tau. Ib qho 9 µm ib zaug -hom APC endface nrog cov khoom khib nyiab ntawm cov tub ntxhais fiber ntau tuaj yeem ntxiv 0.5-3 dB ntawm qhov poob qis - qhov sib npaug ntawm kev sib pauv qib siab -qib splitter rau ib yam khoom. Hauv 1 × 32 unit, koj muaj 33 connector interfaces (ib lub tswv yim, 32 outputs) qhov no tuaj yeem tshwm sim. Kev tshuaj xyuas teb nrog cov fiber ntau endface ua ntej txhua mating tsis yog xaiv tau; nws yog ib qho siab tshaj plaws -leverage ua hauv kev tswj kom zoo.
2. Field-splice kev ua tau zoo piv rau kev tsim qauv
Poob peev nyiaj ib txwm xav tias 0.1 dB ib fusion splice. Ib tus kws tshaj lij nrog cov calibrated fusion splicer ua tiav 0.05-0.08 dB ib splice raws li kev tswj xyuas. Nyob rau hauv ib qho kev faib khoom kaw rau yav tav su cua, tib tus kws tshaj lij nrog tib lub splicer tuaj yeem ua tiav 0.15-0.3 dB ib splice vim fiber ntau sib txawv nrog kev tuav. Plaub splices ntawm 0.25 dB txhua es tsis txhob ntawm 0.1 dB txhua ntxiv 0.6 dB ntawm unbudgeted poob - uas siv 20% ntawm cov aging margin nyob rau hauv cov piv txwv ua hauj lwm saum toj no.
3. Qhov "tsis ploj" kev laus
Network Cheebtsam degrade. Connector mating nto tsim kev hnav facets. Epoxy pob qij txha nyob rau hauv fusion kaw nkag mus nyob rau hauv thermal cycling. Sab nraum zoov cov ntsaws ruaj ruaj tso cai rau micro- noo noo ingress. Tshaj li 25 xyoo, lub qhov dej zoo - engineering network sau 1.5–3 dB ntawm kev poob dhau qhov kev ua haujlwm. Ib pob nyiaj siv uas kaw rau hauv 1 dB ntawm hnub ua haujlwm yuav tsis kaw rau xyoo yim.APNIC tau luam tawm GPON kev txheeb xyuas nyiaj txiaglees paub tias qhov tsis raug lossis qhov kev cia siab tsis zoo yog qhov ua rau ntawm - cov teeb meem kev txais kev pabcuam hauv kev siv FTTx.
1 × 16 vs 1 × 32 hauv kev xa tawm tiag tiag
Txoj kev sib cais tsis yog lo lus teb thoob ntiaj teb - nws yog cov lus teb rau lo lus nug topology. Ntawm no yog plaub hom kev xa tawm nrog cov lus pom zoo engineering rau txhua tus, muab los ntawm kev paub dhau los thiab kev poob - cov nyiaj lej lej saum toj no.
Lub suburban scenario yog ib qho uas ua rau feem ntau ntawm cov teeb meem hauv cheeb tsam. Nws yog ib qho, nws yog qhov twg Class B + OLTs niaj hnub siv, thiab nws yog raws nraim qhov topology qhov twg 1 × 32 thiab 1 × 16 saib sib hloov ntawm daim ntawv nthuav dav tab sis tsim cov txiaj ntsig sib txawv ntau tshaj kaum xyoo ntawm kev ua haujlwm.
Vim li cas ntau tus neeg teb xov tooj nyiam cascaded splitting - thiab nws cov nqi tiag tiag
Centralized splitting tso ib 1 × 32 unit nyob rau hauv ib tug fiber faib hub, thiab 32 fibers kiv cua tawm mus rau 32 ONTs. Cascaded splitting qhov chaw 1 × 4 nyob ze ntawm OLT thiab plaub 1 × 8 units ze rau cov neeg siv khoom. Qhov tshwm sim tseem yog 32 outputs, tab sis txoj kev kho qhov muag txawv.
Qhov poob lej ntawm cascaded vs. centralized 1 × 32
| Kev tsim vaj tsev | Splitter poob | Ntxiv splice ntsiab lus | Tag nrho splitter + splice nyiaj siv ua haujlwm |
|---|---|---|---|
| Centralized 1 × 32 | 17.5 dB (max) | 0 ntxiv | 17.5 dB |
| Luas 1 × 4 + 1 × 8 | 7.4 + 11.0=18.4 dB | +4 splice pob qij txha | 18.4 + 0.4=18.8 dB |
| Luas 1 × 2 + 1 × 16 | 3.6 + 14.0=17.6 dB | +2 splice pob qij txha | 17.6 + 0.2=17.8 dB |
Cascaded splitting nqi koj0.9-1.3 dB ntau poobpiv rau hauv nruab nrab ntawm qhov sib npaug ntawm cov neeg siv suav suav - physics ntawm stacking split txheej xwm yog yam tsis muaj. Yog li vim li cas cov neeg ua haujlwm paub txog xaiv nws?
Cov ntaub ntawv raug cai rau cascaded splitting
- Kev txuag fiber ntau.Nyob rau hauv ib cheeb tsam los yog ib nrab- kev xa tawm nyob deb nroog, qhov deb ntawm OLT mus rau qhov chaw faib khoom yuav yog 10–15 km, tab sis txhua tus neeg siv tsuas yog 200–500 m ntawm qhov chaw faib khoom ntawd. Khiav 32 tus neeg poob fibers tshaj 10 km yog qhov kim tshaj li khiav ib lub feeder mus rau qhov chaw faib khoom thiab 32 luv luv los ntawm qhov ntawd. Cascaded splitting tso cai rau qhov topology.
- Staged build- tawm.Ib chav 1 × 4 ntawm OLT tuaj yeem pib pub tsuas yog ob lub 1 × 8 splitters; lwm ob qhov chaw nres nkoj tseem tab tom kaw kom txog thaum cov neeg siv khoom loj hlob tuaj. Qhov no yog tsis yooj yim sua nrog ib qho 1 × 32 chav tsev cog lus rau ib qho chaw tshwj xeeb.
- Tsis ua kev kaw tus kheej.Qhov txhaum hauv ib theem 1 × 8 cuam tshuam tsuas yog 8 tus neeg siv. Ib qho txhaum hauv ib qho 1 × 32 cuam tshuam rau tag nrho 32. Rau SLA-kev lag luam hnyav, qhov no tseem ceeb.
Yuav ua li cas xam qhov kev nyab xeeb GPON margin - kauj ruam -los ntawm - kauj ruam txoj kev
Safe margin tsis yog kwv yees; nws yog xam. Nov yog txoj hauv kev raws li kev xyaum ua los ntawm cov kws paub txog ODN engineers, tau thov rau 1 × 32 kev xa tawm ntawm Chav B + OLT ntawm 10 km.
Kauj ruam 1 - Tsim cov pob nyiaj siv tag nrho
Tag nrho cov peev nyiaj=OLT Tx zog − ONT Rx rhiab heev. Rau GPON Class B+: +3 dBm Tx, −28 dBm Rx rhiab heev →28 dB tag nrho pob nyiaj siv.For Class C+: +5 dBm Tx, −32 dBm Rx →32 dB tag nrho pob nyiaj siv.Ib txwm siv qhov siab tshaj qhov poob qis los ntawm qhov tsis zoo ntawm tus neeg txais kev nkag siab ntawm cov ntaub ntawv - tsis raug.
Kauj ruam 2 - Sau tag nrho cov poob tas
- Fiber ntau attenuation:tag nrho txoj kev ntev (km) × 0.35 dB / km ntawm 1490 nm rau G.652D cable. Siv tus neeg muag khoom cable qhov tseeb spec; tsis txhob xav tias ITU pem teb.
- Splitter insertion poob:siab tshaj IL los ntawm cov ntaub ntawv, tsis raug. Rau peb 1 × 32: 17.5 dB max (los yog 16.8 dB yog xaj units nrog rau ib - daim ntawv pov thawj units).
- Connector mating poob:0.3 dB ib mating nyob rau hauv tej yam kev mob. Suav txhua qhov txuas txuas: OLT thaj vaj huam sib luag, cov khoom siv hluav taws xob sib cais, cov zis tawm tawm, FAT adapter, ONT nco connector. Ib qho kev sib txuas 1 × 32 muaj 6-8 mating ntsiab lus.
- Splice poob:0.1 dB ib fusion splice (zoo-ua tiav teb splice). Suav txhua splice nyob rau hauv txoj kev.
Kauj Ruam 3 - Khaws kev laus thiab kho cov npoo
Qhov no yog cov kauj ruam feem ntau ua tsis tau tejyam peev nyiaj hla. Muab qhov tsawg kawg nkaus ntawm3 dB rau kev laus thiab kho cov npoo. Qhov no npog: connector nto hnav tshaj 15+ xyoo (~ 0.5 dB), epoxy sib koom ua ke creep thiab ya raws ingress (~0.5 dB), ob yav tom ntej kho splices hloov Hoobkas - zoo splices (~ 0.4 dB), thiab ib tug tsis rau ib connector hloov nyob rau hauv ONT poob sab (~ 0.5 dB). Qhov seem ~ 1 dB npog qhov kev mus ncig ua si thiab ntsuas qhov tsis paub meej. Peb decibels tsis padding - nws yog amortized teb kev muaj tiag.
Kauj ruam 4 - Kos cov npoo; kho yog tias xav tau
Yog tias (tag nrho cov peev nyiaj - tas li poob - aging margin) Ntau dua lossis sib npaug rau 0, koj muaj qhov tsim nyog siv tau. Yog tias qhov seem tsis zoo lossis qis dua 1 dB, koj muaj peb lub zog: hloov kho OLT chav kawm (ntxiv 4 dB), txo qhov sib piv ntawm 1 × 32 mus rau 1 × 16 (txuag 3.5 dB), lossis ua kom luv ntawm txoj kev cable. Hloov cov connector zoo los ntawm generic (0.5 dB) kom zoo tshaj -qib APC (0.3 dB) ntawm yim interfaces txuag 1.6 dB - feem ntau txaus los cawm tus ciam teb tsim.
XGS-PON hloov qhov sib npaug - tab sis tsis yog lej
XGS-PON (ITU-T G.9807.1) muab 10 Gbps symmetrically thiab qhia nws tus kheej cov chav kawm attenuation: N1 (29 dB pob nyiaj), N2 (31 dB pob nyiaj siv), thiab E1 (35 dB pob nyiaj siv). Lub splitter physics zoo ib yam - ib qho 1 × 32 PLC chav tsev tseem raug nqi 17.5 dB max - tab sis lub taub hau muaj hloov pauv loj, thiab cov phiaj xwm wavelength hloov.
XGS-PON downstream ua haujlwm ntawm 1577 nm es tsis yog GPON's 1490 nm. G.652D ib leeg- hom fiber ntau muaj qis qis qis ntawm 1577 nm (~ 0.30 dB / km piv rau ~ 0.35 dB / km ntawm 1490 nm). Ntawm qhov txuas 10 km, qhov sib txawv yog 0.5 dB - me me, tab sis ntsuas tau thaum cov peev nyiaj nruj. Qhov tseem ceeb dua, XGS-PON's N2 chav kawm ntawm 31 dB sib tw GPON Class C+ ze heev, ua rau feem ntau C + cog ncaj qha nrog XGS-PON N2 OLT hloov kho yam tsis muaj re{22}}engineering ODN.
| Txuj | Chav kawm | Tag nrho pob nyiaj siv | Tsis yog -splitter poob (zoo) | Lub taub hau tom qab 1 × 32 | Txiav txim |
|---|---|---|---|---|---|
| GPON | Chav B+ | 28dB ib | ~ 7.0 dB | 3.5dB ua | Marginal ntawm 8 km |
| GPON | Chav Kawm C+ | 32dB ib | ~ 7.0 dB | 7.5dB ib | Yooj yim |
| XGS-PON | N1 | 29dB ib | ~ 6.5 dB (qis fiber ntau poob) | 5.0dB ib | Tsim nyog |
| XGS-PON | N2 | 31dB ib | ~ 6.5 dB | 7.0dB ib | Yooj yim |
| XGS-PON | E1 | 35dB ib | ~ 6.5 dB | 11.0 dB | Haum txawm rau 1 × 64 |
Cov tswv yim coj mus siv: cov neeg ua haujlwm npaj kev tsiv teb tsaws chaw los ntawm GPON mus rau XGS-PON yuav tsum xyuas kom meej tias ODN uas twb muaj lawm tau tsim kom tsawg kawg yog Class C + qauv. Ib tsob nroj 1 × 32 tsim los rau Class B+ txwv yuav xav tau OLT-chav kawm hloov kho lossis faib- piv txwv thaum XGS-PON tau qhia - vim tias siab dua -chav XGS-PON OLTs yog xav tau los tswj kom muaj kev sib luag. PebPLC splitter ntau yam (1 × 2 txog 1 × 64)npog tag nrho GPON thiab XGS-PON cov phiaj xwm wavelength nrog lub tiaj tiaj 1260–1650 nm teb, zam kev sib pauv kho vajtse thaum OLT tiam hloov.
Cov lus nug uas nquag nug
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Q: Dab tsi yog qhov cuam tshuam tsis zoo ntawm 1 × 32 splitter?
A: Lub ITU-T G.984-aligned specification rau 1 × 32 PLC splitter yog qhov siab tshaj qhov poob ntawm 17.5 dB ntawm 1260–1650 nm, nrog chaw nres nkoj - rau-port uniformity tsawg dua los yog sib npaug rau 1.9 dB. Zoo-cov khoom tsim tau sim ntawm 100% ntawm kev tsim khoom ua tiav qhov kev poob qis ntawm 16.7-16.9 dB - kwv yees li 0.7 dB hauv qab lub qab nthab spec. Ib txwm tsim rau qhov siab tshaj plaws, tsis txhob mus rau qhov raug, vim hais tias cov xwm txheej hauv cheeb tsam ntxiv qhov poob uas lub chaw kuaj tsis tau.
Q: Puas yog 1 × 64 siv tau rau GPON?
A: Yog, tab sis tsuas yog nyob rau hauv tej yam kev mob: GPON Class C + los yog siab dua OLT, feeder cable nyob rau hauv 3-4 km, siab - zoo fusion splicing thoob plaws, thiab ib -unit lees txais kev xeem ntawm lub splitter. Ib chav tsev 1 × 64 PLC muaj qhov siab tshaj qhov tso tawm ntawm 21 dB. Ntawm chav kawm B + OLT nrog 28 dB tag nrho cov peev nyiaj, tom qab fiber ntau thiab cov khoom sib txuas poob koj muaj qhov tseem ceeb tsis muaj kev laus. ITU-T G.984 tus qauv lees paub 1 × 64 rau Class C+ networks tshwj xeeb. Hauv kev xyaum, 1 × 64 yog qhov kev xaiv tus qauv rau siab -qhov ceev hauv nroog MDU kev xa tawm hauv Tebchaws Europe (OpenFiber, FiberCop) qhov twg txoj kev deb luv luv thiab OLT cov chav kawm siab. Nws tsis tshua muaj lus teb rau suburban los yog nyob deb nroog tsim.
Q: Ntau npaum li cas cov nyiaj khaws tseg yuav tsum FTTH tes hauj lwm khaws cia?
A: Yam tsawg kawg ntawm 3 dB kev laus thiab kho cov npoo yog cov qauv kev pom zoo los ntawm kev ua haujlwm engineering. Qhov no suav nrog cov khoom siv sib txuas, kev sib koom ua ke, kev kho lub neej yav tom ntej splices, thiab kev ntsuas qhov tsis paub tseeb dhau 25- xyoo network lub neej. Cov tes hauj lwm tsim los yam tsis muaj kev laus laus zuj zus ib txwm xav tau kev hloov kho OLT uas tsis tau npaj tseg lossis hloov pauv hloov hauv 5-8 xyoo ntawm kev ua haujlwm. Yog tias koj qhov topology yuam cov peev nyiaj qis dua 3 dB npoo, txhim kho OLT chav kawm lossis txo qhov sib cais - tsis txhob txais cov npoo nyias.
Q: Puas yog cascaded splitting nce qhov ua tsis tiav?
A: Tsis yog nyob rau hauv - PLC nti yog PLC nti txawm nws zaum hauv cascade. Cascaded splitting qhia ntau cov ntsiab lus splice thiab connector interfaces, txhua yam uas muaj peev xwm kis tau los yog qhov chaw tsis ua haujlwm. Nws kuj tseem ua rau muaj kev sib cais nyuaj dua: thaum 1 × 8 theem ua tsis tiav hauv qhov cascade, koj poob 8 tus neeg siv khoom; qhov txhaum tuaj yeem yog nyob rau hauv 1 × 4 thawj- theem pigtail lossis hauv 1 × 8 unit, yuav tsum tau ua haujlwm OTDR los ntawm ntau qhov chaw nkag. Txawm hais tias qhov kev ua haujlwm nyuaj ua rau pom tseeb qhov kev txuag nyiaj fiber ntau yog nyob ntawm txoj kev geometry thiab cov neeg coob tus nqi hauv koj lub khw.
Q: Thaum twg kuv yuav tsum siv 1 × 16 hloov 1 × 32?
A: Siv 1 × 16 thaum: koj OLT yog Class B + (28 dB pob nyiaj siv), koj cov khoom siv hluav taws xob ntau tshaj 8 km, koj qhov txuas ua haujlwm nyob rau sab nraum zoov hnyav uas xav tau kev laus ntxiv, lossis koj cov nroj tsuag fiber ntau siv cov khoom sib txuas zoo hauv qab APC- qib. Qhov sib txawv ntawm 3.5 dB ntawm 1 × 32 (17.5 dB max) thiab 1 × 16 (14.0 dB max) txhais ncaj qha rau hauv ncav cuag, aging headroom, los yog muaj peev xwm nqus tau hauv qab no -spec teb kho yam tsis muaj kev pabcuam hu. Ntawm Chav Kawm C + OLTs thiab cov kev hauv qab 5 km, 1 × 32 feem ntau yog qhov kev xaiv nyiaj txiag zoo dua.
Q: Kuv puas tuaj yeem sib xyaw 1 × 32 thiab 1 × 16 splitters hauv tib tsob ntoo PON?
A: Tsis yog - ib tsob ntoo PON txhais tau hais tias txhua ONTs sib koom tib lub OLT chaw nres nkoj thiab yog li ntawd tib txoj kab nqes nqes mus rau thawj qhov sib cais. Koj tsis tuaj yeem muaj qhov sib txawv sib txawv ntawm qhov sib luag los ntawm tib lub tswv yim fiber ntau tshwj tsis yog tias koj siv cascaded splitting, qhov twg 1 × N thawj theem pub sib txawv thib ob -theem cais suav. Hauv ob -theem cascade, qhov sib txawv thib ob- theem sib piv yog technically ua tau (ib qho 1 × 8 thiab ib qho 1 × 4 pub los ntawm tib 1 × 4 thawj theem, piv txwv li), tab sis lawv tsim qhov sib txawv - txoj hauv kev poob rau cov neeg sib txawv - uas cuam tshuam kev kuaj mob thiab OTDR txhais tau zoo.
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