EPON (Ethernet Passive Optical Network)
Ethernet passive optical network yog ib qho PON technology uas siv Ethernet. Nws siv cov qauv taw tes rau ntau qhov thiab passive fiber optic transmission, muab ntau yam kev pabcuam hla Ethernet. EPON technology yog tus qauv los ntawm IEEE802.3 EFM working group. Thaum Lub Rau Hli 2004, IEEE802.3EFM working group tau tso tawm EPON standard - IEEE802.3ah (koom ua ke nrog IEEE802.3-2005 standard hauv xyoo 2005).
Hauv tus qauv no, Ethernet thiab PON technologies raug sib koom ua ke, nrog rau PON technology siv ntawm lub cev txheej thiab Ethernet protocol siv ntawm cov ntaub ntawv txuas txheej, siv cov topology ntawm PON kom ua tiav Ethernet nkag mus. Yog li ntawd, nws muab cov txiaj ntsig ntawm PON technology thiab Ethernet technology ua ke: tus nqi qis, bandwidth siab, muaj zog scalability, sib xws nrog Ethernet uas twb muaj lawm, kev tswj hwm yooj yim, thiab lwm yam.
GPON (Gigabit-Capable PON)
Cov thev naus laus zis no yog tiam tshiab tshaj plaws ntawm broadband passive optical integrated access standard raws li ITU-TG.984.x tus qauv, uas muaj ntau yam zoo xws li bandwidth siab, ua haujlwm tau zoo, thaj chaw loj, thiab cov neeg siv interfaces nplua nuj. Nws raug suav los ntawm feem ntau cov neeg teb xov tooj ua lub thev naus laus zis zoo tshaj plaws rau kev ua tiav broadband thiab kev hloov pauv ntawm kev nkag mus rau cov kev pabcuam network. GPON tau thawj zaug thov los ntawm lub koom haum FSAN thaum lub Cuaj Hli 2002. Raws li qhov no, ITU-T ua tiav kev tsim kho ntawm ITU-T G.984.1 thiab G.984.2 thaum Lub Peb Hlis 2003, thiab tau ua tus qauv G.984.3 thaum Lub Ob Hlis thiab Lub Rau Hli 2004. Yog li, tsev neeg tus qauv ntawm GPON thaum kawg tau tsim.
GPON thev naus laus zis tau pib los ntawm ATMPON thev naus laus zis tus qauv uas maj mam tsim nyob rau xyoo 1995, thiab PON sawv cev rau "Passive Optical Network" hauv lus Askiv. GPON (Gigabit Capable Passive Optical Network) tau raug thov thawj zaug los ntawm lub koom haum FSAN thaum lub Cuaj Hli 2002. Raws li qhov no, ITU-T tau ua tiav kev tsim kho ntawm ITU-T G.984.1 thiab G.984.2 thaum Lub Peb Hlis 2003, thiab tau teeb tsa G.984.3 thaum Lub Ob Hlis thiab Lub Rau Hli 2004. Yog li, 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 chaw ua 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 (SM fiber) thiab passive splitter, thiab network management system txuas ob lub khoom siv thawj zaug.
Qhov txawv ntawm EPON thiab GPON
GPON siv cov thev naus laus zis wavelength division multiplexing (WDM) los pab kom upload thiab download tau tib lub sijhawm. Feem ntau, 1490nm optical carrier siv rau downloading, thaum 1310nm optical carrier xaiv rau uploading. Yog tias cov teeb liab TV xav tau xa mus, 1550nm optical carrier kuj tseem yuav siv. Txawm hais tias txhua ONU tuaj yeem ua tiav qhov ceev download ntawm 2.488 Gbits / s, GPON kuj siv Time Division Multiple Access (TDMA) los faib ib lub sijhawm rau txhua tus neeg siv hauv lub teeb liab periodic.
Qhov siab tshaj plaws ntawm kev rub tawm ntawm XGPON yog txog li 10Gbits/s, thiab qhov siab tshaj plaws ntawm kev xa tawm kuj yog 2.5Gbit/s. Nws kuj siv thev naus laus zis WDM, thiab qhov ntev ntawm cov khoom nqa kho qhov muag upstream thiab downstream yog 1270nm thiab 1577nm, raws li.
Vim yog qhov nce ntxiv ntawm kev sib kis, ntau ONUs tuaj yeem faib ua ntau hom ntawv raws li tib hom ntaub ntawv, nrog rau qhov siab tshaj plaws ntawm 20km. Txawm hais tias XGPON tseem tsis tau siv dav dav, nws muab txoj hauv kev zoo rau cov neeg teb xov tooj sib txuas lus optical.
EPON sib xws nrog lwm cov qauv Ethernet, yog li tsis tas yuav hloov pauv lossis encapsulation thaum txuas nrog Ethernet networks, nrog rau qhov siab tshaj plaws ntawm 1518 bytes. EPON tsis xav tau txoj kev nkag mus rau CSMA / CD hauv qee qhov Ethernet versions. Tsis tas li ntawd, vim tias Ethernet kis yog txoj hauv kev tseem ceeb ntawm kev xa xov hauv zos, tsis tas yuav hloov pauv network protocol thaum lub sijhawm hloov kho mus rau lub network cheeb tsam.
Kuj tseem muaj 10 Gbit/s Ethernet version uas yog 802.3av. Qhov ceev ntawm kab yog 10.3125 Gbits/s. Hom tseem ceeb yog 10 Gbits/s uplink thiab downlink rate, qee qhov siv 10 Gbits/s downlink thiab 1 Gbit/s uplink.
Lub Gbit/s version siv cov wavelengths sib txawv ntawm cov fiber, nrog rau qhov wavelength downstream ntawm 1575-1580nm thiab qhov wavelength upstream ntawm 1260-1280nm. Yog li ntawd, lub 10 Gbit/s system thiab tus qauv 1Gbit/s system tuaj yeem ua wavelength multiplexed ntawm tib lub fiber.
Kev sib koom ua ke ntawm peb qhov kev ua si
Qhov kev sib koom ua ke ntawm peb lub network txhais tau hais tias nyob rau hauv cov txheej txheem ntawm kev hloov pauv los ntawm kev sib txuas lus hauv xov tooj, xov tooj cua thiab TV network, thiab Internet mus rau broadband kev sib txuas lus network, digital TV network, thiab tiam tom ntej Internet, peb lub network, los ntawm kev hloov pauv kev siv tshuab, feem ntau muaj cov haujlwm kev siv tshuab zoo ib yam, tib lub lag luam, kev sib txuas network, kev sib koom cov peev txheej, thiab tuaj yeem muab cov neeg siv nrog lub suab, cov ntaub ntawv, xov tooj cua thiab TV thiab lwm yam kev pabcuam. Kev sib koom ua ke peb zaug tsis txhais tau hais tias kev sib koom ua ke ntawm peb lub network loj, tab sis feem ntau yog hais txog kev sib koom ua ke ntawm cov ntawv thov lag luam siab.
Kev koom ua ke ntawm peb lub network no tau siv dav hauv ntau qhov chaw 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 cov tsev muaj kev nyab xeeb. Yav tom ntej, cov xov tooj ntawm tes tuaj yeem saib TV thiab siv internet, TV tuaj yeem hu xov tooj thiab siv internet, thiab cov khoos phis tawj kuj tuaj yeem hu xov tooj thiab saib TV.
Kev koom ua ke ntawm peb lub network tuaj yeem raug tshuaj xyuas los ntawm ntau lub zeem muag thiab ntau qib, suav nrog kev koom ua ke thev naus laus zis, kev koom ua ke ua lag luam, kev koom ua ke hauv kev lag luam, kev koom ua ke ntawm lub davhlau ya nyob twg, thiab kev koom ua ke hauv network.
Kev siv tshuab broadband
Lub ntsiab lus tseem ceeb ntawm kev siv tshuab broadband yog kev siv tshuab fiber optic sib txuas lus. Ib qho ntawm lub hom phiaj ntawm kev sib koom ua ke ntawm network yog los muab cov kev pabcuam sib koom ua ke los ntawm lub network. Txhawm rau muab cov kev pabcuam sib koom ua ke, nws yog qhov tsim nyog kom muaj lub platform network uas tuaj yeem txhawb nqa kev xa ntau yam multimedia (streaming media) cov kev pabcuam xws li suab thiab video.
Cov yam ntxwv ntawm cov lag luam no yog kev thov lag luam siab, cov ntaub ntawv loj, thiab cov kev pabcuam zoo, yog li lawv feem ntau xav tau bandwidth loj heev thaum lub sijhawm xa xov. Ntxiv mus, los ntawm kev xam pom kev lag luam, tus nqi yuav tsum tsis txhob siab dhau. Ua li no, cov thev naus laus zis sib txuas lus fiber optic muaj peev xwm siab thiab ruaj khov tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev xa xov xwm. Kev txhim kho ntawm cov thev naus laus zis broadband, tshwj xeeb tshaj yog cov thev naus laus zis sib txuas lus optical, muab cov bandwidth tsim nyog, qhov zoo ntawm kev xa xov, thiab tus nqi qis rau kev xa ntau yam ntaub ntawv lag luam.
Ua ib lub tshuab tseem ceeb hauv kev sib txuas lus niaj hnub no, kev siv tshuab sib txuas lus kho qhov muag tab tom txhim kho ntawm qhov nrawm ntawm 100 npaug ntawm kev loj hlob txhua 10 xyoo. Kev xa xov fiber optic nrog lub peev xwm loj yog lub platform xa xov zoo tshaj plaws rau "peb lub network" thiab lub cev tseem ceeb ntawm txoj kev loj ntawm kev tshaj xov xwm yav tom ntej. Kev siv tshuab sib txuas lus fiber optic loj muaj peev xwm tau siv dav hauv kev sib txuas lus hauv xov tooj, computer networks, thiab kev tshaj tawm thiab TV networks.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-12-2024