Emkhakheni wamanethiwekhi e-broadband, ubuchwepheshe obubili obuvelele buye baba izimbangi ezinkulu ekuhlinzekeni ngezinsizakalo ze-inthanethi ezisheshayo: i-EPON ne-GPON. Nakuba zombili zinikeza ukusebenza okufanayo, zinomehluko ohlukile okufanele uzihlole ukuze uqonde amakhono azo futhi unqume ukuthi iyiphi evumelana kangcono nezidingo zakho.
I-EPON (Ethernet Passive Optical Network) kanye ne-GPON (Gigabit Passive Optical Network), zombili izindlela ezidumile zokusabalalisa ukuxhumana kwe-inthanethi okunesivinini esikhulu kubasebenzisi abasebenzisa ubuchwepheshe be-fiber optic. Bayingxenye yomndeni we-Passive Optical Network (PON) wobuchwepheshe; nokho, ziyehluka ngezakhiwo kanye nokusebenza.
Umehluko omkhulu phakathi kwe-EPON ne-GPON ungqimba lwabo lokulawula ukufinyelela kwemidiya (MAC). I-EPON isebenzisa i-Ethernet, ubuchwepheshe obufanayo obusetshenziswa kumanethiwekhi endawo (LAN) namanethiwekhi endawo ebanzi (WAN). Ngokusebenzisa i-Ethernet, i-EPON ihlinzeka ngokuhambisana nezinhlelo ezikhona ezisekelwe ku-Ethernet, okuyenza ibe inketho evumelana nezimo kakhulu kubaqhubi benethiwekhi.I-GPON, ngakolunye uhlangothi, isebenzisa ubuchwepheshe be-Asynchronous Transfer Mode (ATM), indlela endala kodwa esasetshenziswa kakhulu yokudlulisa idatha. Inzuzo yokusebenzisa i-ATM kunethiwekhi ye-GPON ukuthi ingahlinzeka ngezinsizakalo zokudlala kathathu (izwi, ividiyo kanye nedatha) endaweni yesikhulumi sokuphindaphinda okuhlukaniswayo, ngaleyo ndlela iqinisekise ukusetshenziswa kahle komkhawulokudonsa.
Omunye umehluko obalulekile isivinini sokudluliswa komfula kanye nasenhla nomfula. I-EPON ngokuvamile inikeza izivinini ezilinganayo, okusho ukuthi isivinini sokulanda nesokulayisha siyefana. Ngokuphambene, i-GPON isebenzisa ukusethwa kwe-asymmetric okuvumela isivinini esiphakeme esiphansi somfula kanye nesivinini esiphansi esikhuphukayo. Lesi sici senza i-GPON ilungele izinhlelo zokusebenza ezidinga isivinini sokulanda ngokushesha, njengokusakaza ividiyo nokudluliswa kwamafayela amakhulu. Ngokuphambene, izivinini ezilinganayo ze-EPON ziyenza ifaneleke kakhulu ezinhlelweni zokusebenza ezithembele kakhulu ekudluliselweni kwedatha ye-symmetrical, njengenkomfa ngevidiyo namasevisi wamafu.
Nakuba kokubili i-EPON ne-GPON zisekela ingqalasizinda yefayibha efanayo, ubuchwepheshe babo be-OLT (Optical Line Terminal) kanye ne-ONT (Optical Network Terminal) buhlukile. I-GPON ingakwazi ukusekela inombolo enkulu yama-ONT nge-OLT ngayinye, ikwenze kube ukukhetha kokuqala lapho ukukala kuwukukhathazeka. I-EPON, ngakolunye uhlangothi, inobubanzi obude, okuvumela o-opharetha benethiwekhi ukuthi banwebe ukuxhumana ukusuka ehhovisi elimaphakathi noma indawo yokusabalalisa. Lesi sici senza i-EPON isebenziseke ekuhlanganiseni izindawo ezinkulu zejografi.
Ngokombono wezindleko, i-EPON ne-GPON ziyahlukahluka ngokuya ngezindleko zokusetha zokuqala. Ngenxa yokwakheka kwayo okusekelwe ku-ATM, i-GPON idinga imishini eyinkimbinkimbi nemba eqolo. Ngokuphambene, i-EPON isebenzisa ubuchwepheshe be-Ethernet, obamukelwa kabanzi futhi obungabizi kakhulu. Kodwa-ke, kubalulekile ukuqaphela ukuthi njengoba ubuchwepheshe buthuthuka futhi nabahlinzeki abaningi bengena emakethe, igebe lezindleko phakathi kwalezi zinketho ezimbili liyancipha kancane kancane.
Kafushane, kokubili i-EPON ne-GPON yizinketho ezisebenzayo zokuhlinzeka ngoxhumano lwe-inthanethi olunesivinini esikhulu. Ukusebenzisana kwe-EPON ne-Ethernet kanye nesivinini esilinganayo kuyenza ithandeke ebhizinisini nasezinhlelweni zokuhlala ezidinga ukudluliswa kwedatha okulinganiselwe. Ngakolunye uhlangothi, ukusetshenziswa kwe-GPON kwe-ATM kanye nesivinini esingalinganisiyo kwenza kube ukukhetha kokuqala kwezinhlelo zokusebenza ezidinga isivinini sokulanda ngokushesha. Ukuqonda umehluko phakathi kwe-EPON ne-GPON kuzosiza abaqhubi benethiwekhi nabasebenzisi bokugcina benze izinqumo ezinolwazi lapho bekhetha ubuchwepheshe obufanelana kangcono nezidingo zabo ezithile.
Isikhathi sokuthumela: Oct-19-2023