Kev sib piv ntawm tsib PON-raws li FTTX nkag
Tam sim no high-bandwidth access networking txoj kev yog tsuas yog raws li PON-based FTTX nkag.Cov ntsiab lus tseem ceeb thiab cov kev xav uas koom nrog hauv kev txheeb xyuas tus nqi yog raws li hauv qab no:
● Khoom siv tus nqi ntawm seem nkag (nrog rau ntau yam khoom siv thiab kab, thiab lwm yam, nruab nrab rau txhua tus neeg siv kab)
● Cov nqi tsim kho engineering (nrog rau cov nqi tsim kho thiab lwm cov nqi nyiaj siv ua haujlwm, feem ntau 30% ntawm tag nrho cov khoom siv)
● Kev khiav hauj lwm thiab kev tu cov nqi (feem ntau yog li 8% ntawm tag nrho cov nqi hauv ib xyoos)
● Tus nqi teeb tsa tsis suav nrog (uas yog, tus nqi nruab nrab yog 100%)
● Cov khoom siv uas yuav tsum tau muaj yog xam raws li 500 tus qauv siv
Lus Cim 1: FTTX kev nkag mus tsis xav txog tus nqi ntawm chav tsev computer hauv zej zog;
Lus Cim 2: ADSL2+ tsis muaj qhov zoo dua piv nrog ADSL thaum qhov kev nkag mus deb yog 3km.VDSL2 tam sim no tsis tau siv dav, yog li tsis muaj kev sib piv yuav ua rau lub sijhawm;
Lus Cim 3: Optical fiber nkag tau pom tseeb qhov zoo ntawm qhov ntev.
FTTB + LAN
Lub chaw ua haujlwm hauv nruab nrab yog xa los ntawm fiber ntau optical (3km) mus rau qhov sib xyaw ua ke ntawm thaj chaw nyob lossis lub tsev, thiab tom qab ntawd txuas nrog txoj hauv kev hloov mus los ntawm kev siv fiber ntau (0.95km), thiab tom qab ntawd xa mus rau cov neeg siv kawg siv Qeb 5 cable (0.05). km).Muab xam raws li 500 tus neeg siv tus qauv (tsis xav txog tus nqi ntawm chav cell), tsawg kawg yog ib qho 24-chaw nres nkoj aggregation hloov thiab 21 24-chaw nres nkoj corridor keyboards yuav tsum tau.Hauv kev siv tiag tiag, ib qib ntxiv ntawm kev hloov pauv feem ntau ntxiv.Txawm hais tias tag nrho cov keyboards nce ntxiv, kev siv cov qauv qis dua ntawm txoj kev hloov pauv yuav txo tus nqi tag nrho.
FTTH
Xav txog kev tso OLT ntawm lub chaw ua haujlwm hauv nruab nrab, ib qho kev kho qhov muag fiber ntau (4km) mus rau hauv lub cell central computer chav, nyob rau hauv lub cell central computer chav los ntawm 1: 4 optical splitter (0.8km) rau txoj kev hauv tsev, thiab 1: 8 optical. splitter (0.2km) nyob rau hauv txoj kev hauv tsev neeg siv davhlau ya nyob twg.Muab xam raws li 500-tus neeg siv tus qauv (tsis xav txog tus nqi ntawm chav cell): tus nqi ntawm cov khoom siv OLT raug faib rau ntawm qhov ntsuas ntawm 500 tus neeg siv, yuav tsum muaj tag nrho ntawm 16 OLT ports.
FTTC + EPON + LAN
Kuj xav txog qhov tso OLT ntawm lub chaw ua haujlwm hauv nruab nrab.Ib qho kev kho qhov muag fiber ntau (4km) yuav raug xa mus rau chav tsev computer hauv nruab nrab ntawm cov zej zog.Chav tsev computer hauv nruab nrab ntawm cov zej zog yuav dhau los ntawm 1: 4 optical splitter (0.8km) mus rau lub tsev.Hauv txhua txoj kev hauv tsev, 1: 8 optical splitter (0.2km) yuav raug siv.) Mus rau txhua pem teb, thiab tom qab ntawd txuas mus rau tus neeg siv lub davhlau ya nyob twg nrog Qeb 5 kab.Txhua ONU muaj Layer 2 switching function.Xav tias ONU tau nruab nrog 16 FE chaw nres nkoj, uas yog, txhua ONU tuaj yeem nkag mus rau 16 tus neeg siv, uas suav nrog 500 tus qauv siv.
FTTC+EPON+ADSL/ADSL2+
Rau tib daim ntawv thov ntawm DSLAM downward hloov, txiav txim siab muab ib qho OLT ntawm lub hauv paus chaw ua hauj lwm, thiab ib tug fiber ntau (5km) los ntawm BAS kawg chaw ua hauj lwm mus rau lub general kawg chaw ua hauj lwm, thiab nyob rau hauv lub general kawg chaw ua hauj lwm, dhau los ntawm ib tug 1: 8 optical. splitter (4km) mus rau ONU nyob rau hauv lub cell center computer chav.Lub ONU txuas ncaj qha rau DSLAM los ntawm FE interface, thiab tom qab ntawd txuas nrog tus neeg siv kawg nrog ib khub twisted (1km) tooj liab cable.Nws kuj yog xam raws li 500 tus neeg siv tus qauv txuas nrog txhua DSLAM (tsis xav txog tus nqi ntawm chav cell).
Point-to-point optical Ethernet
Lub hauv paus chaw ua hauj lwm yog deployed los ntawm optical fiber (4km) mus rau aggregation hloov ntawm lub zej zog los yog lub tsev, thiab ces xa ncaj qha mus rau cov neeg siv kawg ntawm optical fiber (1km).Muab xam raws li 500 tus neeg siv tus qauv (tsis xav txog tus nqi ntawm chav cell), yam tsawg kawg 21 24-chaw nres nkoj aggregation keyboards yuav tsum tau, thiab 21 khub ntawm 4 kilometers ntawm qaum pob txha kho qhov muag fibers yog nteg los ntawm lub hauv paus chaw ua hauj lwm computer chav tsev mus rau lub aggregation. switches nyob rau hauv lub cell.Txij li thaum point-to-point optical Ethernet feem ntau tsis yog siv rau kev siv dav dav hauv thaj chaw nyob, nws feem ntau tsuas yog siv rau kev sib txuas ntawm cov neeg siv tseem ceeb tawg.Yog li ntawd, nws lub tuam tsev tsim kho txawv ntawm lwm txoj kev nkag, yog li cov txheej txheem suav kuj txawv.
Los ntawm kev txheeb xyuas saum toj no, nws tuaj yeem pom tias qhov kev tso kawm ntawm optical splitter yuav muaj kev cuam tshuam ncaj qha rau kev siv fiber ntau, uas tseem cuam tshuam rau tus nqi ntawm kev tsim kho network;EPON cov khoom siv tam sim no tsuas yog txwv los ntawm kev tawg qhov muag pom kev xa tawm / txais module thiab cov tub ntxhais tswj module / Chips thiab E-PON module cov nqi pheej yig kom tau raws li kev xav tau ntawm kev lag luam;piv rau xDSL, tus nqi nkag ib zaug ntawm PON yog siab dua, thiab nws yog tam sim no tsuas yog siv nyob rau hauv tshiab tsim los yog rov tsim dua cov neeg siv ntom ntom.Point-to-point optical Ethernet tsuas yog tsim nyog rau tsoomfwv thiab cov neeg siv khoom lag luam vim nws tus nqi siab.Siv FTTC + E-PON + LAN lossis FTTC + EPON + DSL yog qhov kev daws teeb meem zoo dua los maj mam hloov mus rau FTTH.