Uma ungazi ngomehluko phakathi kwe-EPON Vs GPON kulula ukudideka ngenkathi uthenga. Ngalesi sihloko masifunde ukuthi iyini i-EPON, yini i-GPON, futhi iyiphi ongayithenga?
Yini i-EPON?
Inethiwekhi ye-Ethernet passive optical iwuhlobo olugcwele lwesifushaniso esithi EPON. I-EPON iyindlela yokuxhumanisa amakhompyutha kuwo wonke amanethiwekhi ezokuxhumana ahlukahlukene. Ihlukile ku-EPON, i-GPON isebenza kumaseli e-ATM. I-EPON ne-GPON zihlukaniswa ngale ndlela. Ukusetshenziswa Kwephakethe Elithuthukisiwe Ngaphezu Kwamanethiwekhi Omkhawulokudonsa Omncane (EPON) ku-Fiber ukuya Emagcekeni kanye Ne-Fiber kumasistimu asekhaya. I-EPON yenza iziphetho eziningi zixhumane ngefayibha eyodwa yokubona. I-EPON idlulisela idatha, umsindo, nevidiyo nge-inthanethi ngamaphakethe e-Ethernet. Akukho ukuguqulwa okwengeziwe noma i-encapsulation edingekayo ekuxhumekeni kwe-EPON ngoba ibuyela emuva-ihambisana namanye amazinga e-Ethernet. Akunzima ukufika ku-1 Gbps noma ku-10 Gbps. Ukukubeka ngenye indlela, kubiza kancane kune-GPON.
Iyini i-GPON?
I-Gigabit Ethernet Passive Optical Network igama eliphelele lesifinyezo se-GPON.
Ezokuxhumana ngezwi, i-Gigabit Ethernet Passive Optical Network isebenzisa iphrothokholi ye-ATM, kuyilapho ithrafikhi yedatha iphathwa nge-Ethernet. Izivinini ezisheshayo ezansi nomfula ziyatholakala nge-GPON uma kuqhathaniswa ne-EPON. Inethiwekhi ye-Broadband passive Optical, noma i-GPON, iyindinganiso yokufinyelela. I-GPON isetshenziswa kumanethiwekhi e-FTTH. Ngenxa yomkhawulokudonsa wayo ophezulu, izinketho zesevisi eziguquguqukayo, nokufinyelela okubanzi, i-GPON iya ngokuya iba ubuchwepheshe benethiwekhi obukhethwayo. Indlela yokusebenza ithathwa njengezinga legolide lokukhulisa ukufinyelela kwamanethiwekhi e-broadband. Ngokufanayo, i-2.5 Gbps ingafinyelelwa kokubili phezulu nomfula. Kuyenzeka ukuzuza isivinini esingu-2.5Gbps ezansi nomfula kanye nesivinini esingu-1.25Gbps esikhuphuka nomfula.
I-EPON Vs GPON iyiphi ongayithenga?
1) Izindinganiso ezihlukene zamukelwe yi-GPON ne-EPON. I-GPON iwubuchwepheshe obuthuthuke kakhulu kune-EPON futhi inamandla okusekela abasebenzisi abaningi kanye nokuthuthwa kwedatha. Ifomethi yefreyimu ye-ATM, ethathwe kubuchwepheshe bokuxhumana bokuqala be-APONBPON fiber optical, isetshenziswa ukusakaza ikhodi yokudlulisa ku-GPON. Ukusakaza kwekhodi ye-EPON kuyifomethi yozimele we-Ethernet, futhi i-EPON's E imele i-Ethernet exhumene ngoba ibibalulekile ekuqaleni ukuthi i-EPON ikwazi ukuxhumana ne-inthanethi ngokuqondile. Ukwamukela ukudluliswa kwe-optical fiber, ifomethi yozimele ye-EPON iqukethwe ngokwemvelo ngaphandle kohlaka lwefomethi yozimele we-Ethernet.
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Izinga le-IEEE 802.3ah lilawula i-EPON. Lona umqondo oyinhloko ngemuva kwezinga le-EPON le-IEEE: ukwenza i-EPON ibe sezingeni ngendlela esebenza ngayo ngaphakathi kwe-architecture engu-802.3 ngaphandle kokunweba iphrothokholi ye-MAC ye-Ethernet evamile kancane ngangokunokwenzeka.
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I-GPON ichazwe ochungechungeni lwe-ITU-TG.984 lwamazinga. Ukuze kugcinwe ukuqhubeka kwesikhathi kwe-8K, izinga le-GPON lokuziphendukela kwemvelo lilandisa ngokuhambisana emuva namasevisi akhona e-TDM futhi ligcina uhlaka olugxilile lwe-125ms. Ngenhloso yokuxhasa izivumelwano eziningi, okuhlanganisa i-ATM, i-GPON inikeza ifomethi yephakheji yenoveli. I-GEM:GPONEncapsulaTIonMethod. Idatha ye-ATM ingahlanganiswa nedatha evela kwamanye amaphrothokholi ngenxa yokwenza uzimele.
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4) Ezimeni zomhlaba wangempela, i-GPON inikeza umkhawulokudonsa owusizo kakhulu kune-EPON. Umphathi wayo wenkonzo uphumelela kakhulu, futhi amandla ayo okuhlukanisa anamandla. Imisebenzi eyinkimbinkimbi kakhulu yenziwa yenzeke ngenxa yekhono layo lokudlulisa izinsiza eziningi zomkhawulokudonsa, ukwandisa ukufinyelela komsebenzisi, futhi icabangele iziqinisekiso zesevisi eziningi kanye ne-QoS. Lokhu kungenxa yokuthi i-GPON ibiza ngaphezu kwe-EPON, kuyilapho umehluko phakathi kwakho kokubili uyancipha ngenxa yokusetshenziswa kabanzi kobuchwepheshe be-GPON.
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Sekukonke, i-GPON idlula i-EPON ngokuya ngamamethrikhi okusebenza, kodwa i-EPON isebenza kahle kakhulu futhi iyathengeka. Kungenzeka ukuthi esikhathini esizayo semakethe yokufinyelela ku-broadband, ukuhlalisana nokuhambisana kungase kubaluleke kakhulu kunokunquma ukuthi ubani ozongena esikhundleni sikabani. I-GPON ifaneleka kangcono kumakhasimende anesidingo somkhawulokudonsa, izinsiza eziningi, nezidingo zokuphepha futhi asebenzisa ubuchwepheshe be-ATM kunethiwekhi yabo yomgogodla. Esigabeni semakethe esihlanganisa amakhasimende akhathazeke ngokuyinhloko ngentengo futhi anokukhathazeka okumbalwa ngokuqhathaniswa kwezokuphepha, kuwo i-EPON iqhamuke njengokuhamba phambili okucacile. Ngakho ngenkathi ukuthenga okusekelwe ezidingweni zekhasimende kunganquma ukuthi iyiphi okufanele ithenge.