Nyob rau hauv niaj hnub no kev ceev ceev Internet Era, fiber-rau-tsev (FTH-rau-tsev (FTH) thev naus laus zis tau dhau los ua cov khoom lag luam siab, cov kev pab cuam network siab, qis latency network. Ntawm lub plawv ntawm FTH tes hauj lwm dag cov kab kho qhov muag lub davhlau ya nyob twg (OLT), ib qho khoom tseem ceeb uas ua si lub luag haujlwm tseem ceeb. Tsab ntawv no rho tawm mus rau cov neeg ua haujlwm ntawm OLTS, lawv txoj haujlwm hauv lub network architecture, thiab lawv qhov tseem ceeb rau kev sib txuas lus niaj hnub no.
A OLT yog dab tsi?
Ib txoj kab kho qhov muag lub davhlau ya nyob twg (OLT) yog ib lub cuab yeej nyob ntawm cov neeg muab kev pabcuam Central chaw ua haujlwm lossis cov ntaub ntawv chaw, ua haujlwm raws li cov qauv tseem ceeb hauv kev kho qhov muag network (PON). Lub OLT feem ntau ua haujlwm raws li lub interface ntawm cov neeg siv khoom-artices optical network terminals (ONTS) lossis cov kws khomob kho tshiab.
Qhov tseem ceeb, ib qho olt yog cov khoom siv ntau platform uas:
Hloov Hluav Taws Xob Hluav Taws Xob Los Ntawm Cov Core Network rau hauv Optical Cov Teeb Meem
Cov ntaub ntawv xa mus rau cov neeg siv khoom siv los ntawm cov khoom siv kho kho kho qhov muag network (ODN)
Tau txais thiab cov txheej txheem nce toj cov ntaub ntawv los ntawm cov neeg siv khoom siv
Tswj Bandwidth faib thiab tswj cov tsheb khiav rau tag nrho cov Pon system
OLT txoj hauj lwm hauv Network architecture
Nkag siab ntawm OLT qhov kev tso chaw hauv lub network yog qhov tseem ceeb rau kev sib tw nws txoj haujlwm:
Tus olt tso rau ntawm tus ciam ntawm cov neeg muab kev pabcuam network thiab tus neeg siv khoom sib txuas nrog cov kev sib txuas tseem ceeb sib txuas nrog cov tes hauj lwm tas li mais.
Cov haujlwm tseem ceeb ntawm A OLT
1. Cov paib hloov dua siab tshiab thiab kis tau
Lub oo hloov hluav taws xob hluav taws xob (feem ntau IP \/ ethernet) los ntawm cov ntsiab lus tseem ceeb rau kev sib kis cov fiber ntau rau cov neeg siv khoom siv. Ib txhij, nws tau txais cov cim muag muag muag los ntawm cov neeg siv khoom thiab hloov lawv rov qab rau cov cim hluav taws xob rau cov ntsiab lus tseem ceeb.
2. Multiplexing thiab demultipleXing
OLTS ua hauj lwm lub sijhawm faib khoom muaj ntau yam (TDMA) thev naus laus zis Lawv ua txhaum kev tswj hwm txhua ONU lub sijhawm sib kis kom tiv thaiv cov ntaub ntawv kev sib tsoo.
3. Bandwidth Kev Tswj Xyuas thiab Qos lees paub
Los ntawm cov kev faib tshwj xeeb bandwidth (DBA) algorithms muab cov kev pab cuam uas tseem ceeb tshaj plaws rau cov neeg siv thiab ua kom zoo nkauj zoo li lub suab thiab video.
4. Network tswj thiab tshuaj xyuas
OLTS muab kev tswj hwm kev sib koom tes network nrog rau:
ONU \/ ONT Sau Npe thiab Kev Tso Cai
Kev soj ntsuam xyuas cov tshuaj ntsuam thiab kev ua txhaum
Software hloov chaw thiab chaw taws teeb teeb tsa
Txoj Cai Tswj Xyuas Kev Ruaj Ntseg
5. Cov Kev Pab Ntau Ntxiv
Cov olts modern niaj hnub txhawb cov hom kev pabcuam ntau yam:
Kev Kub Ceev Hauv Is Taws Nem Kev Siv Is Taws Nem
Iptv thiab video-on-thov
VoIP Xov Tooj
Enterprise Kab Kab
Txawb Backhaul (5G FRIthaul \/ Midhaul)
Thev naus laus zis ntawm Odts
Raws li network xav tau loj hlob, oot technology txuas ntxiv mus ntxiv:
Bppon(Broadband Pon): Tus Qauv Thaum Ntxov nrog 1.25gbps ceev
Gon(Gigabit Pon): Cov Qauv Txheej Txheem Tshaj Tawm tam sim no (2.5gbps Down \/ 1.25gbps Up)
Xg-Pon: 10Gbps owntream \/ 2.5gbps ntws los
Xgs-pon: Symmetrical 10GBps
Ng-pon2: Multi-wavelength kev txhawb nqa nrog peev xwm tshaj 40GPPS
Daim Ntawv Thov Kev Ua Lag Luam OLTS
OLTS tau dav sau rau ntau qhov xwm txheej:
Nyob Qhov Chaw Broundband: Muab kev kub ceev rau lub tsev
Kev Pabcuam rau Kev Lag Luam: Kev xa tawm kom txhim khu kev qha cov kab rau cov lag luam
Tsev Kawm Pua: Pab cov tsev kawm qib siab, tsev kho mob, thiab cov tsev loj
Ntse Nroog: Pab txhawb cov ntawv thov xws li kev nce qib nroog thiab kev thauj mus los ntse
5g Txawb Backhaul: Txuas mus rau 5G cov hlwb me los ntawm FRIthaul \/ Midhofaul
Yav Tom Ntej Cov Qauv Hauv OLT Kev Loj Hlob
Muaj peev xwm siab dua: Evolution mus rau 50g pon thiab txawm tias 100g pon
Kev tswj Smarter: CUAM AI RAU KEV UA HAUJ LWM THIAB PIB-OPPTIES
Virtualized olts (volt): NFV-ua cov kev daws teeb meem rau kev xa tawm yooj yim
Tob dua convergence: Siv lub ntsej muag sib xyaw nrog 5g thiab ntug kev sib tw
Cov Pib Pib Pib: Txo kev noj hluav taws xob thiab kev txhim kho hluav taws xob
