EPON + EOC kev pab cuam lub tsev
EPON siv tib qho hluav taws xob fiber ntau 3-wavelength los xa cov lag luam tag nrho, ob qho tib si ntawm EPON OLT / downlink yoj (1310 / 1490nm) los ntawm wavelength faib multiplexing, digital video rau kis cov ntaub ntawv, suab thiab IP sib pauv (IP-SDTV) , qhov thib peb wavelength (1550nm) rau downlink CATV RF kis. Nrog tus qauv no, PON tuaj yeem npog ntau dua 20km 16 nyob rau ntawm qhov khoos phis kho qhov muag. HFC network tshaj tawm xov xwm TV teeb kom ua tiav, IP, lub suab, video-on-demand ob txoj hauv kev lag luam ua haujlwm los ntawm EPON. EPON downlink: teeb liab kis ntawm ntau cov kev pabcuam hla lub caj qaum txuas mus rau lub chaw haujlwm nruab nrab (hauv ntej kawg), tom qab ntawd hloov mus rau lub teeb liab kho qhov muag OLT, siv cov kev pabcuam rau tus neeg siv tshaj tawm, mus rau ONU los ntawm PON faib koog. Los ntawm ONU kho qhov muag / hluav taws xob hloov pauv thiab cov coj ua tom qab, cov ntaub ntawv chaw nyob ntawm txhua ONU txhua pob, tau txais lawv cov pob ntawv. Nqa los ntawm txhua daim ONU Ethernet raws MAC chaw nyob ntawm cov ntaub ntawv cuam tshuam, txiav txim siab seb puas yuav Ethernet ncej txais lossis tso tseg. EPON ntws tawm qhov kev taw qhia: ntws los siv lub sijhawm sib faib ntau lub sijhawm (TDMA), thiab lub kaw lus ua cov nyiaj them qeeb ncua, OLT cov sijhawm sib txawv tau faib rau txhua ONU raws li qee cov ntsiab lus ntawm cov teeb liab upward rov nkag txhua ONU hom fiber ntau dispenser, tsuas yog nyob rau hauv kev faib rau nws lub sijhawm sijhawm ntawm qhov, kom tsis txhob sib txawv ONU cov ntaub ntawv sib tsoo sib tsoo nrog txhua tus cuam tshuam. EOC, ONU rau BAN, tus neeg siv kawg 100m ~ 1km tseem siv tau tsev neeg cable coaxial, ntau li ntau tau kom nqaim qhov sib txawv ntawm kev sib pauv network, cov neeg siv teeb tsa EOC ONU module rau cov ntaub ntawv sib pauv. EOC cov kev siv cov xov tooj kab ke coaxial network txuas los daws cov teeb meem nkag mus rau lub tsev kawg, zam qhov kev tsim kho ob txoj kev hauv tsev, tsis muaj kev cuam tshuam rau cov xov tooj cua downlink tshaj tawm xov tooj cua, thiab muab cov ntaub ntawv xa mus rau lub peev xwm. EPON + EOC coaxial kawg mais qhov kev siv dav dav kom pom zoo tsim nyog rau ob txoj hauv kev xov tooj cua thiab xov tooj cua kev sib pauv.
Lub cev nta:
1. Tsawg tus nqi, yooj yim txij nkawm, yooj yim nthuav, yooj yim txhim kho. EPON architecture nyob rau hauv kev hla mus tsis tas yuav muaj lub zog, txuag hluav taws xob, yooj yim kom nteg, tsis txhob siv lub chaw hauv zej zog, tsis muaj cov qauv kho qhov muag, uas yog kev ua haujlwm ntev thiab kev tswj hwm ntawm cov nqi loj. Qhov tseem ceeb tshaj plaws yog EPON + EOC nkag network tshuab, EPON thev naus laus zis ua lub teeb ci rau tooj liab, fiber ntau rau cov kev hloov hauv tsev, thiab EOC EPON thev naus laus zis tau daws teeb meem 100m ~ 1km kawg nyob hauv tsev, thiab siv cov peev txheej tshaj tawm cov khoom qub.
2. EPON systems xws li cov sib txuas sib txuas passive kho qhov muag thiab HFC network tshaj tawm cov network kho qhov muag tau zoo ib yam. Hauv cov txheej txheem fiber-rau-txoj kev hauv tsev tuaj yeem sib koom ua ke txoj kev ntau tshaj li ib tus tub sab qaum thiab fiber ntau daim ntaub tuaj yeem hloov kho tau raws li qhov tseeb ntawm thaj chaw pom kev faib tawm thiab tus naj npawb ntawm cov neeg siv, thiab nkag mus rau ntau tus neeg siv, txuag ib pob tw fiber ntau.
3.EPON system yog cov thev naus laus zis yav tom ntej thev naus laus zis, nkaus raws Ethernet tus qauv kev cai 802.3ah, qib siab ntawm cov qauv, yooj yim nthuav tawm, rov qab siab ntawm peev, yog qhov hloov mus rau txhua tus IP tes hauj lwm qhov kev xaiv zoo.
Cov kab sab saum toj thiab hauv qab ntawm cov ntaub ntawv hauv tib-ntxhais kis hluav taws xob fiber ntau xa mus, daws qhov teeb meem ntawm ob-txoj kev xa mus, muab cov hluav taws xob sib npaug. EPON hauv kab txoj kab tam sim no muab symmetrical 1.25Gbit / s bandwidth.
5. saj zawg zog bandwidth faib nyiaj thiab kev pab yog lav. Kev lees paub bandwidth thiab muaj ib qho ua tiav. EPON tuaj yeem DBA (dynamic bandwidth algorithm), DiffServ, PQ / WFQ, WRED, thiab lwm yam kom ua tiav bandwidth faib rau txhua tus siv, thiab xyuas kom txhua tus neeg siv QoS.
Qhov ntsuas ntsiab tseem ceeb ntawm cov qauv xeem
Tom qab ONU thiab lub chaw haujlwm nruab nrab xaiv, xaiv me me kom deb ntawm lub teeb hu cov neeg siv khoom uas tsis muaj txoj hauv kev los ntsuas cov suab nrov. Cov txheej txheem sim yog raws li nram no:
1) Qhib lub TV saib lub TV TV saib tsis muaj dab tsi tshwm sim.
2) Siv TV Qhov Kev Tshawb Fawb Lub Xov Tooj (Test Signal Level Meter) kom ntsuas seb lub teeb liab TV puas ua suab nrov, saib puas tsim nyog rau qhov ua kom muaj nuj nqis (npaum li cas lub teeb liab tawm TV, nws yuav tsum tswj hwm qhov ntsuas hluav taws xob ntau npaum li cas).
3) Lub tsev coaxial cable txuas nrog lub davhlau ya nyob twg kom pom lub teeb ci ntsa iab davhlau ya nyob twg CAB, CAB qhov taw qhia lub teeb thaum lub davhlau ya nyob twg thiab lub hauv paus chaw ua haujlwm tau qhib.
4) Kuaj koj lub khoos phis tawm ntawm lub network cable txuas nrog lub davhlau ya nyob twg, yog tias lub davhlau ya nyob twg LAN teeb lub teeb, ces lub davhlau ya nyob twg thiab lub khoos phis tawm.
5) Nrog rau kev xeem computer PING lub rooj vag nrhiav kom ncua ntev yog tsawg dua 10ms (Nco tseg: tsis suav lub hauv paus chaw ua haujlwm tau teeb tsa tom qab rub tawm).
6) Kev siv qhov kev tswj hwm software tswj xyuas seb qhov yuav tsum ua ntawm txoj kab attenuation SNR (lub teeb liab rau lub suab nrov 60dB attenuation tsawg dua ≥50dB).
7) Yog hais tias muaj xwm txheej, kev siv cov cuab yeej tshwj xeeb ntsuas rau cov cim taw qhia, kev siv bandwidth, thiab kev kuaj pom dhau los. Yog tias koj ua tau raws li txhua qhov yuav tsum tau ua dhau los, ces kev nkag mus ntawm kev tsim kho tau ua tiav, Internet, TV thiab cov ntaub ntawv pabcuam tuaj yeem qhib lub sijhawm twg los tau.
