Hauv kev lag luam ntawm cov tes hauj lwm broadband, ob lub thev naus laus zis tseem ceeb tau dhau los ua cov neeg sib tw tseem ceeb hauv kev muab cov kev pabcuam hauv Is Taws Nem ceev ceev: EPON thiab GPON. Txawm hais tias ob qho tib si muaj cov haujlwm zoo sib xws, lawv muaj qhov sib txawv uas tsim nyog tshawb nrhiav kom nkag siab txog lawv cov peev xwm thiab txiav txim siab seb qhov twg zoo tshaj plaws rau koj cov kev xav tau.
EPON (Ethernet Passive Optical Network) thiab GPON (Gigabit Passive Optical Network), ob txoj kev nrov ntawm kev faib cov kev sib txuas hauv Is Taws Nem ceev rau cov neeg siv siv cov thev naus laus zis fiber optic. Lawv yog ib feem ntawm tsev neeg Passive Optical Network (PON) ntawm cov thev naus laus zis; txawm li cas los xij, lawv txawv hauv cov qauv thiab kev ua haujlwm.
Qhov txawv tseem ceeb ntawm EPON thiab GPON yog lawv cov txheej txheem tswj kev nkag mus rau xov xwm (MAC). EPON siv Ethernet, tib lub thev naus laus zis siv hauv cov tes hauj lwm hauv zos (LAN) thiab cov tes hauj lwm dav dav (WAN). Los ntawm kev siv Ethernet, EPON muab kev sib raug zoo nrog cov kab ke uas twb muaj lawm, ua rau nws yog qhov kev xaiv yooj yim rau cov neeg ua haujlwm hauv network.GPON, ntawm qhov tod tes, siv Asynchronous Transfer Mode (ATM) thev naus laus zis, uas yog ib txoj kev xa cov ntaub ntawv qub tab sis tseem siv ntau. Qhov zoo ntawm kev siv ATM hauv GPON network yog tias nws tuaj yeem muab cov kev pabcuam triple play (suab, video thiab data) ntawm lub platform multiplexing sib cais, yog li ua kom muaj kev siv bandwidth zoo.
Lwm qhov sib txawv tseem ceeb yog qhov ceev ntawm kev xa mus rau sab saud thiab sab saud. EPON feem ntau muaj qhov ceev sib npaug, txhais tau tias qhov ceev rub tawm thiab xa mus rau sab saud yog tib yam. Qhov sib piv, GPON siv qhov kev teeb tsa asymmetric uas tso cai rau qhov ceev siab dua thiab qhov ceev qis dua. Qhov no ua rau GPON zoo tagnrho rau cov ntawv thov uas xav tau qhov ceev rub tawm sai dua, xws li kev tshaj tawm video thiab kev hloov cov ntaub ntawv loj. Qhov sib piv, EPON qhov ceev sib npaug ua rau nws tsim nyog dua rau cov ntawv thov uas vam khom rau kev xa cov ntaub ntawv sib npaug, xws li kev sib tham video thiab cov kev pabcuam huab.
Txawm hais tias ob qho tib si EPON thiab GPON txhawb nqa tib lub fiber infrastructure, lawv cov OLT (Optical Line Terminal) thiab ONT (Optical Network Terminal) technologies sib txawv. GPON tuaj yeem txhawb nqa ntau dua ntawm ONTs ib OLT, ua rau nws yog thawj qhov kev xaiv thaum scalability yog qhov txhawj xeeb. EPON, ntawm qhov tod tes, muaj ntau yam ntev dua, tso cai rau cov neeg teb xov tooj network txuas ntxiv kev sib txuas ntxiv los ntawm lub chaw ua haujlwm hauv nruab nrab lossis qhov chaw faib khoom. Qhov feature no ua rau EPON muaj txiaj ntsig zoo rau kev npog thaj chaw loj.
Los ntawm qhov kev xam pom ntawm tus nqi, EPON thiab GPON sib txawv ntawm cov nqi teeb tsa thawj zaug. Vim nws lub tshuab ATM-based architecture, GPON xav tau cov khoom siv nyuaj dua thiab kim dua. Qhov sib txawv, EPON siv cov thev naus laus zis Ethernet, uas tau txais kev pom zoo dav dav thiab pheej yig dua. Txawm li cas los xij, nws tsim nyog sau tseg tias thaum thev naus laus zis zoo dua thiab ntau tus neeg muag khoom nkag mus rau hauv kev ua lag luam, qhov sib txawv ntawm tus nqi ntawm ob txoj kev xaiv maj mam nqaim zuj zus.
Hauv kev xaus lus, ob qho tib si EPON thiab GPON yog cov kev xaiv zoo rau kev muab kev sib txuas hauv Is Taws Nem ceev ceev. EPON qhov sib xws nrog Ethernet thiab qhov ceev sib npaug ua rau nws nyiam rau cov ntawv thov lag luam thiab cov tsev nyob uas xav tau kev sib kis cov ntaub ntawv sib npaug. Ntawm qhov tod tes, GPON siv ATM thiab qhov ceev asymmetric ua rau nws yog thawj qhov kev xaiv rau cov ntawv thov uas xav tau kev rub tawm ceev dua. Kev nkag siab txog qhov sib txawv ntawm EPON thiab GPON yuav pab cov neeg teb xov tooj thiab cov neeg siv kawg txiav txim siab thaum xaiv cov thev naus laus zis uas haum rau lawv cov kev xav tau tshwj xeeb.
Lub sijhawm tshaj tawm: Lub Kaum Hli-19-2023