EPON neGPON vane zvazvakanakira.Kubva pa index performance, GPON inopfuura EPON, asi EPON ine zvakanakira nguva uye mutengo.GPON iri kubata.Tichitarisira kumusika wemberi weBroadband, inogona kunge isiri iyo inotsiva ndiani, inofanira kunge iripo uye inopindirana.Kune bandwidth, akawanda-sevhisi, yakakwira QoS uye chengetedzo zvinodiwa, uye vatengi vane ATM tekinoroji seyakaita musana network, GPON ichave yakakodzera.Kune inodhura-isinganzwisisike, QoS, uye yakaderera chengetedzo mapoka evatengi, EPON ndiyo yave kutonga.
Chii chinonzi PON?
Broadband yekuwana tekinoroji iri kuwedzera, inotarirwa kuve nhandare yehondo umo chiutsi hachizombopera.Parizvino, hukuru hwepamba ichiri tekinoroji yeADSL, asi vagadziri vezvishandiso vanowedzera uye vashandisi vakaisa pfungwa kune tekinoroji yekuwana network.
Mitengo yemhangura inoramba ichikwira, optical cable mitengo inoramba ichidonha, uye kuwedzera kuri kuda kwebandwidth kubva kuIPTV uye vhidhiyo yemitambo masevhisi inofambisa kusimudzira kweFTTH.Matarisiro akajeka ekutsiva coaxial tambo dzemhangura newaya netambo dzemaziso, runhare, tambo TV, uye Broadband data triplet zvinova pachena.
PON (Passive OpTIcal Network) passive optical network ndiyo tekinoroji huru yekuwana FTTH fiber kumba, ichipa point-to-multipoint fiber kuwana.Sezvinoratidzwa muFigure 1, ine OLT (optical line terminal) kudivi rehofisi uye rutivi rwemushandisi Inoumbwa neONU (Optical Network Unit) uye ODN (Optical Distribution Network).Kazhinji, iyo yakadzika inoshandisa TDM kutepfenyura uye kumusoro kunoshandisa TDMA (Nguva Division Multiple Access) kugadzira poindi-kune-multipoint muti wepamusoro.PON, senzvimbo huru inopenya ye tekinoroji yekuwana tekinoroji, i "passive".ODN haina chero zvigadzirwa zvemagetsi zvinoshanda uye magetsi emagetsi.Ese anoumbwa neaya anongoita senge optical splitters (Splitter).Mari yekutarisira, yekuchengetedza uye yekushandisa yakaderera.
Tekinoroji maitiro eEPON uye GPON
EPON ine chinangwa chekuenderana neyezvino Ethernet tekinoroji.Iko kuenderera kwe802.3 protocol pane optical access network.Iyo inogara nhaka zvakanakira zveyakaderera Ethernet mitengo, inoshanduka maprotocol, uye yakakura tekinoroji.Iine musika wakakura uye kuenderana kwakanaka.GPON yakamira muindasitiri yezvekufambiswa kwemashoko kune zvinodiwa neakawanda-sevhisi, yakazara-sevhisi kuwana neQoS garandi, uye inovavarira kuwana mhinduro yakakwana inotsigira masevhisi ese uye ine hunyanzvi hwepamusoro, ichikurudzira "kuvhurika uye kuzere kuongorora kwezvibvumirano zvese pachena. ”.
Iwo ehunyanzvi maitiro eEPON ndeaya anotevera:
1) Ethernet ndiyo yakanakisa mutakuri wekutakura IP masevhisi;
2) Kugadzirisa kuri nyore, nyore kuwedzera, nyore kusimudzira;
3) EPON michina yakakura uye iripo.EPON yakaisa mamiriyoni emitsetse muAsia.Iwo echitatu-chizvarwa chekutengesa machipisi akatangwa.Mitengo yeanoenderana optical modules uye machipisi yakaderera zvakanyanya, ichisvika pachiyero chekushandiswa kwekutengeserana, iyo inogona kusangana ichangoburwa Broadband bhizinesi zvinodiwa;
4) Iyo EPON protocol iri nyore uye mutengo wekushandisa wakaderera, uye mutengo wemidziyo wakaderera.Iyo yakanyanya kufanirwa tekinoroji inodiwa mune metro yekuwana network, kwete yakanakisa tekinoroji;
5) Yakanyanya kukodzera kudzimba, metropolitan nharaunda network isina ATM kana BPON mutoro wemidziyo;
6) Yakanyanya kukodzera ramangwana, IP inotakura masevhisi ese, uye Ethernet inotakura IP masevhisi.
Iyo tekinoroji maitiro eGPON ndeaya anotevera:
1) Svika network ye telecom mashandiro;
2) High bandwidth: chiyero chemutsara, pasi pemvura 2.488Gb / s, kumusoro kwe1.244Gb / s;3) Kubudirira kwekufambisa kwepamusoro: maitiro epasi 94% (chaiyo bandwidth kusvika ku2.4G) maitiro epamusoro 93% (chaiyo bandwidth kusvika ku1.1G);
3) Rutsigiro rwebasa rakazara: G.984.X chiyero chinonyatsotsanangura kutsigirwa kwemutakuri-giredhi yakazara masevhisi (izwi, data uye vhidhiyo);
4) Kugona kwakasimba kwekutonga: nemabasa akapfuma, yakakwana yeOAM domain inochengeterwa muchimiro chechimiro, uye zviyero zveOMCI zvinogadzirwa;
5) High service quality: akawanda QoS mazinga anogona kunyatsovimbisa bandwidth uye kunonoka zvinodiwa zvebhizinesi;
6) Mutengo wakaderera wakazara: kureba kwekutapurirana chinhambwe uye yakakwira kupatsanurwa ratio, iyo inogovera zvinobudirira mutengo weOLT uye inoderedza mushandisi mari yekuwana.
Chii chiri nani, EPON vs GPON?
1. Zviyero zvakatorwa neEPON neGPON zvakasiyana.Zvinogona kutaurwa kuti GPON yakanyanyisa uye inogona kutumira bandwidth yakawanda, uye inogona kuunza vashandisi vakawanda kupfuura EPON.GPON yakabva kune yekutanga APON \ BPON tekinoroji ye optical fiber communication, iyo yakagadzirwa kubva pane iyi.Iyo ATM furemu fomati inoshandiswa kufambisa kodhi rwizi.Iyo E yeEPON inoreva iyo yakabatana Ethernet, saka pakutanga kwekuzvarwa kweEPON, yaidiwa kuti ugone kubatanidza zvakananga uye zvisina musono neInternet, saka iyo code stream yeEPON ndiyo furemu fomati yeEthernet.Ehe saizvozvo, kuti uenderane kune kutapurirana pane optical fiber, iyo furemu fomati inotsanangurwa neEPON inoputirwa kunze kweiyo furemu yeEthernet furemu fomati.
2. Muyero weEPON ndeweIEEE 802.3ah.Musimboti wakakosha weIEEE kugadzira chiyero cheEPON ndechekumisa EPON mukati me802.3 architecture zvakanyanya sezvinobvira, uye kuwedzera MAC protocol yestandard Ethernet kusvika padikidiki.
3. Muyero weGPON ndiyo ITU-TG.984 yakatevedzana yezviyero.Iko kuumbwa kweGPON chiyero kunofunga nezverutsigiro rwechinyakare TDM masevhisi uye inoenderera nekushandisa iyo 125ms yakagadziriswa furemu chimiro kuchengetedza 8K nguva yekuenderera.Kuti utsigire akawanda-protocols akadai seATM, GPON inotsanangura mhando-nyowani encapsulation chimiro GEM: GPONEncapsulaTIonMethod.Iyo data yeATM uye mamwe maprotocol anogona kusanganiswa uye kuvharirwa mumafuremu.
4. Maererano nekushandiswa, GPON ine bandwidth yakakura kudarika EPON, mutakuri webasa rayo anonyanya kushanda, uye kukwanisa kwayo kuparadzanisa kwemaziso kwakasimba.Inogona kufambisa yakakura bandwidth masevhisi, kuona kuwanda kwevashandisi kuwana, kubhadhara zvakanyanya kune akawanda-sevhisi uye QoS garandi, asi kuwana zvakanyanya Iyo yakaoma, izvo zvinoita kuti mutengo wayo uwedzere kupfuura weEPON, asi nehukuru-hukuru hwekutumirwa. yeGPON tekinoroji, musiyano wemitengo pakati peGPON neEPON uri kuderera zvishoma nezvishoma.