Hauv tshav pob ntawm broadband tes hauj lwm, ob qhov kev tshaj lij muaj txiaj ntsig tau dhau los ua cov neeg sib tw tseem ceeb hauv kev muab cov kev pabcuam hauv Is Taws Nem kev ua haujlwm siab: Epon thiab GPon. Thaum ob qho tib si muaj kev sib txawv zoo sib xws, lawv muaj qhov sib txawv uas tsim nyog tshawb nrhiav kom nkag siab txog lawv lub peev xwm thiab txiav txim siab saib koj cov kev xav tau zoo tshaj plaws.
Epon (Ethernet Passive Optical Network) thiab GPPON (Gigabe Passive Optical Network), ob qho kev nthuav dav hauv internet sib txuas nrog kev siv fiber ntau thev naus laus zis. Lawv yog ib feem ntawm cov khoom siv kho tshiab (pon) tsev neeg ntawm cov thev naus laus zis; Txawm li cas los xij, lawv txawv hauv architecture thiab ua haujlwm.
Lub ntsiab sib txawv ntawm epon thiab gpon yog lawv cov kev tswj nkag mus (MAC) txheej. Epon siv Ethernet, tib lub thev naus laus zis siv hauv cheeb tsam tes hauj lwm (LAN) thiab dav dav dav dav (WAN). Los ntawm kev siv zog eternet, epon muab kev sib xyaw nrog cov qauv etternet uas twb muaj lawm, ua nws txoj kev hloov pauv yooj yim rau cov haujlwm network.Gon, ntawm qhov tod tes, siv Asynchronous hloov hom (ATM) thev naus laus zis, muaj hnub nyoog laus dua tab sis tseem qub siv cov ntaub ntawv sib kis. Qhov kom zoo ntawm kev siv ATM hauv kev sib koom tes gon rau cov kev pab sib tw (suab, video thiab cov ntaub ntawv) ntawm kev siv cov kev siv ntawm bandwidth.
Lwm qhov sib txawv yog qhov sib txawv yog cov dej ntws los thiab nce qib kis tau. Epon feem ntau muaj cov nrawm nrawm, lub ntsiab lus rub tawm thiab upload ceev yog tib yam. Hauv kev sib piv, GPon siv cov kev teeb tsa asymmetric uas tso cai rau kev nce qib qis dua thiab qis dua nce qib. Cov yeeb yam no ua rau gpon zoo rau cov ntawv thov uas yuav tsum tau rub tawm sai dua, xws li streamic thiab cov ntaub ntawv hloov ntaub ntawv loj. Nyob rau hauv sib piv, epon qhov kev sib dhos ua kom nws haum rau cov ntaub ntawv uas vam khom cov ntaub ntawv sib kis, xws li kev sib tham hauv video thiab huab.
Txawm hais tias ob qho epon thiab Gonk txhawb tib cov fiber ntau cov nyiaj fiber ntau, lawv cov olt (kho qhov muag lub davhlau ya nyob twg) thiab artical network terminal) thev naus laus zis sib txawv. Gonpon tuaj yeem pab txhawb nqa ntau dua ntawm OLT, ua nws thawj qhov kev xaiv thaum lub ntsuas phoo yog kev txhawj xeeb. Epon, ntawm qhov tod tes, muaj ntau ntau, tso cai rau cov haujlwm network kom ntev txuas ntxiv los ntawm lub chaw haujlwm tseem ceeb lossis chaw xa khoom. Qhov yeeb yam no ua rau epon muaj txiaj ntsig rau cov chaw npog thaj chaw loj.
Los ntawm tus nqi pom kev, epon thiab gpon txawv nyob rau hauv cov nqe lus ntawm thawj zaug teeb tsa cov nqi. Vim tias nws cov ATM-raws architecture, gonkon yuav tsum muaj ntau dua thiab kim khoom siv. Nyob rau hauv sib piv, epon siv etheret technology, uas yog siv dav thiab pheej yig. Txawm li cas los xij, nws muaj nqis sau uas raws li thev naus laus zis txhim kho thiab ntau tus neeg xa khoom nkag mus rau hauv kev ua lag luam, tus nqi them tus nqi ntawm ob txoj kev yog maj mam nqaim.
Hauv cov ntsiab lus, ob qho epon thiab gonpon yog qhov siv tau cov kev xaiv rau muab kev siv internet nrawm sib txuas. Epon qhov sib xyaw nrog Ethernet thiab Symmetrical nrawm ua rau nws ntxim nyiam rau kev siv cov ntaub ntawv sib kis. Ntawm qhov tod tes, ggon txoj kev siv ntawm ATM thiab Asymmetric ua rau nws xaiv thawj zaug rau kev siv rub tawm sai. To taub txog qhov sib txawv ntawm epon thiab gpon yuav pab cov neeg ua haujlwm network thiab xaus kev txiav txim siab thaum xaiv lawv cov kev cai tshwj xeeb.
Lub Sijhawm Post: Oct-19-2023