FTTH Fiber Circuit Court Classification

Cov txheej txheem kis tau tus mob ntawm FTTH tau muab faib ua peb pawg: Duplex (dual fiber bidirectional) voj, Simplex (ib leeg fiber ntau bidirectional) voj thiab Triplex (ib fiber ntau peb-txoj kev) voj.Qhov dual-fiber voj siv ob lub optical fibers ntawm lubOLTkawg thiabONUkawg, ib txoj kev yog downstream, thiab lub teeb liab yog los ntawm lubOLTkawg rau qhovONUkawg; lwm txoj kev yog upstream, thiab lub teeb liab yog los ntawm lubONUkawg rau qhovOLTkawg.Simplex ib leeg-fiber voj tseem hu ua Bidirectional, los yog BIDI luv luv. Qhov kev daws teeb meem no tsuas yog siv ib qho fiber ntau optical los txuas rauOLTkawg thiabONUkawg, thiab siv WDM los xa cov kab hluav taws xob sab saud thiab qis qis nrog cov teeb liab kho qhov muag ntawm qhov sib txawv wavelengths.Piv rau Duplex dual-fiber circuits, qhov no ib leeg-fiber circuit siv WDM kis tau tus mob tuaj yeem txo cov fiber ntau siv los ntawm ib nrab thiab txo tus nqi ntawm covONUneeg siv kawg. Txawm li cas los xij, thaum siv ib leeg-fiber txoj kev, ib tug splitter thiab combiner yuav tsum tau qhia nyob rau hauv lub optical transceiver module. Lub teeb liab BIDI sab saud siv lub laser xa mus rau hauv 1260 mus rau 1360nm band, thiab qis qis siv 1480 rau 1580nm band. Nyob rau hauv lub dual-fiber voj, ob qho tib si sab sauv thiab downstream siv 1310nm band los xa cov teeb liab.

FTTH muaj ob lub thev naus laus zis: Media Converter (MC) thiab Passive Optical Network (PON). MC feem ntau yog siv los hloov cov xov tooj tooj liab siv nyob rau hauv ib txwm siv Ethernet tes hauj lwm, thiab txais ib qho point-to-point (P2P) network topology kom xa 100Mbps cov kev pab cuam rau cov neeg siv lub tsev los ntawm optical fibers.The architecture ntawm PON yog tsuas yog faib cov optical. teeb liab los ntawm optical kab davhlau ya nyob twg (OLT) downstream los ntawm ib qho kev kho qhov muag fiber ntau los ntawm ib qho optical splitter kom xa cov teeb liab kho qhov muag mus rau txhua qhov chaw kho qhov muag network (ONU/T), yog li txo qis hauv chav tsev khoom siv network Thiab tus nqi ntawm cov khoom siv tu, txuag ntau cov nqi tsim kho xws li kho qhov muag cables, yog li nws tau dhau los ua cov cuab yeej kub tshiab ntawm FTTH. FTTH tam sim no muaj peb txoj kev daws teeb meem: point-to-point FTTH tov, EPON FTTH tov thiab GPON FTTH tov.

P2P-based FTTH Solution

P2P yog point-to-point optical fiber txuas Ethernet kis tau tus mob technology. Nws kuj tseem siv WDM thev naus laus zis kom ua tiav ob txoj kev sib txuas lus. Piv nrog EPON, nws muaj cov yam ntxwv ntawm kev siv thev naus laus zis yooj yim, tus nqi qis thiab nkag tau yooj yim rau cov neeg siv tsawg.

Lub P2P FTTH network xa tawm cov dej ntws thiab cov dej ntws qis ntawm ib qho khoom siv kho qhov muag ntawm lub hauv paus chaw ua haujlwmhloovthiab cov neeg siv khoom siv los ntawm WDM, thiab txhua tus neeg siv tsuas yog xav tau ib qho fiber ntau optical. Qhov nruab nrab wavelength yog 1310nm, thiab downstream wavelength yog 1550nm.Los ntawm kev siv cov fiber ntau kis tau tus mob, lub Ethernet yog ncaj qha txuas mus rau lub hauv paus chaw ua hauj lwm rau cov neeg siv desktop. Thaum muab txoj kev siv high-bandwidth thiab kev siv nyiaj txiag, nws tshem tawm qhov nyuaj ntawm kev siv hluav taws xob thiab kev saib xyuas ntawm txoj kev hauv tsev.hloovnyob rau hauv txoj kev siv Ethernet ib txwm siv, thiab zam kev nyuaj hauv kev nqis peev rov qab los ntawm kev qhib qis, qhib tau yooj yim thiab kev ruaj ntseg siab. Hauv kev daws teeb meem P2P, cov neeg siv tuaj yeem txaus siab rau 100M bandwidth nkaus xwb, thiab yooj yim txhawb cov kev pabcuam siab bandwidth xws li xov tooj, video ntawm kev thov, telemedicine, thiab kev kawm nyob deb. Thaum txhawb kev siv cov ntaub ntawv ceev ceev, nws tuaj yeem muab E1 interface thiab POTS interface, kom muaj ntau yam kev pab cuam uas thaum xub thawj xav tau kev ywj pheej xaim tuaj yeem daws tau los ntawm ib qho fiber ntau.

EPON-raws li FTTH Solution

EPON txais yuav ib tug point-to-multipoint qauv thiab passive optical fiber kis txoj kev. Tus nqi qis tam sim no tuaj yeem ncav cuag 10Gb / s, thiab cov dej ntws tawm xa cov ntaub ntawv ntws hauv cov pob ntawv Ethernet tawg. Tsis tas li ntawd, EPON tseem muab qee yam haujlwm, kev saib xyuas thiab kev tswj hwm (OAM) ua haujlwm.EPONtechnology muaj zoo compatibility nrog cov khoom uas twb muaj lawm. Kev tsim kho tshiab ntawm Kev Pabcuam Zoo (QoS) thev naus laus zis ua rau nws ua tau rau Ethernet los txhawb lub suab, cov ntaub ntawv thiab cov kev pabcuam duab. Cov thev naus laus zis no suav nrog kev txhawb nqa puv puv, qhov tseem ceeb thiab virtual hauv cheeb tsam network (VLAN).

EPON siv cov khoom siv kho qhov muag los txuas ntawm cov khoom siv hauv chaw ua haujlwm thiab ODN optical coupler. Tom qab sib cais los ntawm cov khoom siv kho qhov muag, mus txog 32 tus neeg siv tuaj yeem txuas nrog. Qhov nruab nrab wavelength yog 1310nm, thiab downstream wavelength yog 1490nm. Optical fiber ntau los ntawm PON chaw nres nkoj ntawm lubOLTmuab 1550nm analog los yog digital CATV optical teeb liab mus rau qhov muag fiber ntau los ntawm multiplexer, thiab ces txuas mus rauONUtom qab muab faib los ntawm optical coupler. CovONUcais 1550nm CATV teeb liab thiab hloov nws mus rau hauv lub xov tooj cua zaus teeb liab uas tuaj yeem tau txais los ntawm lub TV zoo tib yam. CovONUkuj ua cov ntaub ntawv teeb liab xa los ntawm lubOLTthiab xa nws mus rau tus neeg siv interface.Tus neeg siv interface tuaj yeem muab FE thiab TDM interfaces kom tau raws li tus neeg siv cov kev pabcuam rau kev siv broadband, thiab yog sib xws nrog cov neeg ua haujlwm uas twb muaj lawm 'TDM cov kev pabcuam. EPON siv WDM thev naus laus zis kom paub qhov taw tes-rau-multipoint ob txoj kev sib txuas lus ntawm ib qho khoom siv kho qhov muag. Nws muaj cov yam ntxwv ntawm cov qauv pob tshab thiab tus nqi qis, thiab ua raws li txoj kev loj hlob ntawm IP-raws li lwm yam kev tes hauj lwm. Xav tias yav tom ntej "peb lub network hauv ib qho" yuav siv IP raws li cov txheej txheem tseem ceeb, cov kws tshaj lij feem ntau ntseeg tias EPON yog qhov kev daws teeb meem zoo tshaj plaws rau kev paub FTTH yav tom ntej.

GPON-raws li FTTH Solution

GPONyog qhov tseeb kho qhov muag siv tshuab tsim los ntawm ITU-T tom qab A / BPON. Hauv xyoo 2001, FSAN tau pib ua lwm yam kev ua haujlwm uas tswj hwm PON tes hauj lwm (GPON) nrog kev khiav hauj lwm nrawm dua 1Gb / s. Ntxiv nrog rau kev txhawb nqa kev nrawm dua, GPON tseem txhawb nqa ntau yam kev pabcuam nrog kev ua haujlwm siab, muab ntau OAM&P kev ua haujlwm thiab kev ua haujlwm zoo. Cov yam ntxwv tseem ceeb ntawm GPON yog:

1) Txhawb txhua qhov kev pabcuam.

2) Qhov kev ncua deb yog tsawg kawg yog 20km.

3) Txhawb ntau tus nqi raws li tib txoj cai.

4) Muab OAM & P muaj nuj nqi.

5) Raws li kev tshaj tawm cov yam ntxwv ntawm PON downstream tsheb, muaj kev tiv thaiv kev ruaj ntseg ntawm cov txheej txheem txheej txheem.

Tus qauv GPON muab tus nqi sib kis tau zoo tshaj plaws rau cov kev pabcuam sib txawv, thaum coj mus rau hauv tus account OAM&P kev ua haujlwm thiab txhim kho lub peev xwm. GPON tsis tsuas yog muab cov bandwidth siab xwb, tab sis kuj txhawb ntau yam kev pab cuam, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv thiab TDM kis tau tus mob, txhawb cov thawj hom yam tsis tau hloov dua siab tshiab.GPON txais yuav tshiab kis tau tus mob convergence txheej raws tu qauv "General Framing Protocol (GFP)" kom paub lub encapsulation ntawm ntau yam. kev pabcuam ntws; lub sijhawm no, nws tuav ntau txoj haujlwm hauv G.983 uas tsis ncaj qha ntsig txog PON raws tu qauv, xws li OAM thiab DBA.