EPON (Ethernet Passive Optical Network)
Ethernet passive optical network yog PON thev naus laus zis raws li Ethernet. Nws txais qhov taw tes rau cov qauv sib txawv thiab kev sib kis ntawm fiber ntau optic, muab ntau yam kev pabcuam hauv Ethernet. EPON thev naus laus zis tau tsim los ntawm IEEE802.3 EFM pawg ua haujlwm. Thaum Lub Rau Hli 2004, pawg neeg ua haujlwm IEEE802.3EFM tau tso tawm EPON tus qauv - IEEE802.3ah (ua ke rau hauv IEEE802.3-2005 tus qauv hauv 2005).
Hauv cov qauv no, Ethernet thiab PON thev naus laus zis tau sib xyaw ua ke, nrog PON thev naus laus zis siv ntawm cov txheej txheem lub cev thiab Ethernet raws tu qauv siv ntawm cov ntaub ntawv txuas txheej, siv cov topology ntawm PON kom ua tiav Ethernet nkag. Yog li ntawd, nws muab cov txiaj ntsig zoo ntawm PON thev naus laus zis thiab Ethernet thev naus laus zis: tus nqi qis, siab bandwidth, muaj zog scalability, compatibility nrog Ethernet uas twb muaj lawm, kev tswj yooj yim, thiab lwm yam.
GPON (Gigabit-muaj peev xwm PON)
Cov thev naus laus zis yog cov tiam tshiab ntawm broadband passive optical integrated access standard raws li ITU-TG.984. x tus qauv, uas muaj ntau yam zoo xws li kev siv bandwidth siab, kev ua haujlwm siab, thaj chaw loj, thiab cov neeg siv nplua nuj interfaces. Nws raug suav hais tias yog cov neeg ua haujlwm feem ntau yog cov thev naus laus zis zoo tshaj plaws rau kev ua tiav broadband thiab kev hloov pauv ntawm cov kev pabcuam hauv network. GPON tau xub thov los ntawm lub koom haum FSAN thaum lub Cuaj Hlis 2002. Raws li qhov no, ITU-T ua tiav kev txhim kho ntawm ITU-T G.984.1 thiab G.984.2 nyob rau lub Peb Hlis 2003, thiab tus qauv G.984.3 thaum Lub Ob Hlis thiab Lub Rau Hli 2004. Yog li, tus qauv tsev neeg ntawm GPON tau tsim thaum kawg.
GPON thev naus laus zis pib los ntawm ATMPON thev naus laus zis tus qauv uas maj mam tsim hauv xyoo 1995, thiab PON sawv cev rau "Passive Optical Network" ua lus Askiv. GPON (Gigabit Capable Passive Optical Network) yog thawj zaug los ntawm FSAN lub koom haum hauv lub Cuaj Hli 2002. Raws li qhov no, ITU-T ua tiav kev txhim kho ntawm ITU-T G.984.1 thiab G.984.2 nyob rau lub Peb Hlis 2003, thiab tus qauv G.984.3 hauv Lub Ob Hlis thiab Lub Rau Hli 2004. Yog li, cov tsev neeg tus qauv ntawm GPON tau tsim thaum kawg. Cov qauv yooj yim ntawm cov khoom siv raws li GPON thev naus laus zis zoo ib yam li PON uas twb muaj lawm, suav nrog OLT (Optical Line Terminal) ntawm lub chaw haujlwm hauv nruab nrab, ONT / ONU (Optical Network Terminal lossis Optical Network Unit) ntawm tus neeg siv kawg, ODN (Optical Distribution Network) ) tsim los ntawm ib hom fiber ntau (SM fiber) thiab passive splitter, thiab kev tswj hwm kev sib txuas ntawm thawj ob lub cuab yeej.
Qhov txawv ntawm EPON thiab GPON
GPON siv wavelength division multiplexing (WDM) thev naus laus zis los pab txhawb kev rub tawm thiab rub tawm ib txhij. Feem ntau, 1490nm optical carrier yog siv rau rub tawm, thaum lub 1310nm optical carrier raug xaiv rau uploading. Yog tias TV teeb liab yuav tsum tau xa mus, 1550nm optical carrier kuj tseem siv. Txawm hais tias txhua ONU tuaj yeem ua tiav qhov kev rub tawm ceev ntawm 2.488 Gbits / s, GPON kuj tseem siv Lub Sijhawm Division Multiple Access (TDMA) los faib qee lub sijhawm rau txhua tus neeg siv hauv lub sijhawm teeb tsa.
Qhov siab tshaj plaws rub tawm tus nqi ntawm XGPON yog mus txog 10Gbits / s, thiab tus nqi upload kuj yog 2.5Gbit / s. Nws kuj tseem siv WDM thev naus laus zis, thiab lub wavelengths ntawm cov khoom siv hluav taws xob sab saud thiab qis qis yog 1270nm thiab 1577nm, raws li.
Vim tias qhov sib kis tau nce ntxiv, ntau ONU tuaj yeem faib raws li tib cov ntaub ntawv hom, nrog rau qhov kev pab cuam siab tshaj plaws txog li 20km. Txawm hais tias XGPON tseem tsis tau siv dav dav, nws muab txoj hauv kev txhim kho zoo rau cov neeg ua haujlwm kho qhov muag.
EPON tau ua tiav nrog lwm cov qauv Ethernet, yog li tsis tas yuav hloov pauv lossis encapsulation thaum txuas nrog Ethernet raws li kev sib txuas, nrog rau qhov siab tshaj plaws ntawm 1518 bytes. EPON tsis xav tau CSMA / CD txoj kev nkag rau hauv qee qhov Ethernet versions. Tsis tas li ntawd, vim Ethernet kis tau tus mob yog txoj hauv kev tseem ceeb ntawm kev sib kis hauv cheeb tsam hauv cheeb tsam, tsis tas yuav muaj kev hloov pauv hauv lub network raws tu qauv thaum hloov mus rau thaj chaw hauv nroog loj.
Kuj tseem muaj 10 Gbit / s Ethernet version tsim los ua 802.3av. Qhov tseeb kab ceev yog 10.3125 Gbits / s. Lub hom phiaj tseem ceeb yog 10 Gbits / s uplink thiab downlink tus nqi, nrog qee qhov siv 10 Gbits / s downlink thiab 1 Gbit / s uplink.
Gbit / s version siv qhov sib txawv optical wavelengths ntawm cov fiber ntau, nrog ib tug downstream wavelength ntawm 1575-1580nm thiab ib tug upstream wavelength ntawm 1260-1280nm. Yog li, 10 Gbit / s system thiab tus qauv 1Gbit / s system tuaj yeem ua wavelength multiplexed ntawm tib lub fiber ntau.
Triple play integration
Lub convergence ntawm peb tes hauj lwm txhais tau hais tias nyob rau hauv tus txheej txheem ntawm evolution los ntawm telecommunication network, xov tooj cua thiab TV network, thiab Internet mus rau broadband kev sib txuas lus network, digital TV network, thiab lwm tiam Internet, peb tes hauj lwm, los ntawm kev hloov, zoo li yuav muaj lub tib yam kev ua haujlwm, tib yam kev lag luam, kev sib txuas hauv network, kev sib koom ua ke, thiab tuaj yeem muab cov neeg siv lub suab, cov ntaub ntawv, xov tooj cua thiab TV thiab lwm yam kev pabcuam. Triple merger tsis txhais hais tias lub cev kev koom ua ke ntawm peb lub network loj, tab sis feem ntau yog hais txog kev sib koom ua ke ntawm kev lag luam qib siab.
Kev sib koom ua ke ntawm peb lub network tau siv dav hauv ntau yam xws li kev thauj mus los ntse, kev tiv thaiv ib puag ncig, kev ua haujlwm ntawm tsoomfwv, kev nyab xeeb rau pej xeem, thiab tsev nyob nyab xeeb. Nyob rau yav tom ntej, cov xov tooj ntawm tes tuaj yeem saib TV thiab nthwv dej hauv internet, TV tuaj yeem hu xov tooj thiab siv internet, thiab khoos phis tawj tuaj yeem hu xov tooj thiab saib TV.
Kev sib koom ua ke ntawm peb lub network tuaj yeem txheeb xyuas cov tswv yim los ntawm ntau qhov kev xav thiab theem, suav nrog kev sib koom ua ke thev naus laus zis, kev sib koom ua lag luam, kev lag luam kev lag luam, kev sib koom ua ke ntawm lub davhlau ya nyob twg, thiab kev sib koom ua ke hauv network.
Broadband technology
Lub cev tseem ceeb ntawm broadband technology yog fiber optic kev sib txuas lus technology. Ib qho ntawm lub hom phiaj ntawm kev sib koom ua ke hauv network yog los muab kev pabcuam sib koom ua ke los ntawm lub network. Txhawm rau muab cov kev pabcuam sib koom ua ke, nws yuav tsum muaj lub network platform uas tuaj yeem txhawb nqa kev sib kis ntawm ntau yam kev pabcuam multimedia (streaming media) xws li audio thiab video.
Cov yam ntxwv ntawm cov kev lag luam no yog kev lag luam siab, cov ntaub ntawv loj, thiab cov kev pabcuam zoo, yog li lawv feem ntau xav tau bandwidth loj heev thaum sib kis. Tsis tas li ntawd, los ntawm kev pom kev lag luam, tus nqi yuav tsum tsis txhob siab dhau. Nyob rau hauv txoj kev no, muaj peev xwm siab thiab ruaj khov fiber ntau optic kev sib txuas lus thev naus laus zis tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev sib kis xov xwm. Txoj kev loj hlob ntawm broadband technology, tshwj xeeb tshaj yog optical kev sib txuas lus technology, muab qhov tsim nyog bandwidth, kis tau tus mob zoo, thiab tus nqi qis rau kev xa tawm ntau yam ntaub ntawv ua lag luam.
Raws li tus ncej thev naus laus zis hauv kev sib txuas lus tam sim no, kev siv tshuab kho qhov muag tau tsim los ntawm tus nqi ntawm 100 npaug ntawm kev loj hlob txhua 10 xyoo. Fiber optic kis tau tus mob nrog lub peev xwm loj yog qhov zoo tshaj plaws kis tau tus mob platform rau "peb tes hauj lwm" thiab lub ntsiab lub cev nqa ntawm txoj kev loj cov ntaub ntawv yav tom ntej. Lub peev xwm loj fiber ntau optic kev sib txuas lus thev naus laus zis tau siv dav hauv kev sib txuas lus hauv xov tooj, khoos phis tawj tes hauj lwm, thiab tshaj tawm thiab xov tooj cua.
Post lub sij hawm: Dec-12-2024