EPON da GPON suna da nasu cancanta. Daga ma'aunin aikin, GPON ya fi EPON, amma EPON yana da fa'idodin lokaci da farashi. GPON yana kamawa. Sa ido ga kasuwar samun dama ta hanyar sadarwa a nan gaba, maiyuwa ba zai zama wanda ya maye gurbin wanda ba, ya kamata ya kasance tare kuma yana dacewa. Don bandwidth, sabis da yawa, babban QoS da buƙatun tsaro, da abokan ciniki tare da fasahar ATM azaman hanyar sadarwar kashin baya, GPON zai fi dacewa. Don masu tsada, QoS, da ƙananan ƙungiyoyin abokan ciniki, EPON ya zama rinjaye.
Menene PON?
Fasahar shigar da buɗaɗɗiya tana haɓaka, wanda aka ƙaddara ya zama filin yaƙi inda hayaƙi ba zai taɓa bacewa ba. A halin yanzu, al'adar cikin gida har yanzu fasahar ADSL ce, amma ƙarin masana'antun kayan aiki da masu aiki sun mai da hankalinsu ga fasahar samun hanyar sadarwa ta gani.
Farashin Copper yana ci gaba da hauhawa, farashin kebul na gani yana ci gaba da faɗuwa, kuma karuwar buƙatun bandwidth daga IPTV da ayyukan wasan bidiyo suna haifar da haɓakar FTTH. Haƙiƙa mai haske na maye gurbin tagulla da igiyoyin coaxial masu wayoyi tare da igiyoyi na gani, tarho, TV na USB, da bayanan watsa labarai sau uku sun ƙara bayyana.
PON (Passive Optical Network) cibiyar sadarwa na gani mai wucewa shine babban fasaha don cimma fiber FTTH zuwa gida, yana ba da damar fiber-to-multipoint fiber access. Kamar yadda aka nuna a Figure 1, ya ƙunshiOLT(Tsarin layin gani na gani) a gefen ofis da gefen mai amfani Haɗe daONU(Yankin Sadarwar Sadarwa) da ODN (Network Distribution Network). Gabaɗaya, rafin ƙasa yana amfani da watsa shirye-shiryen TDM kuma na sama yana amfani da TDMA (Time Division Multiple Access) don ƙirƙirar topology na itace-zuwa-multipoint. PON, a matsayin babbar tabo mai haske na fasahar samun damar gani, shine "m". ODN bata ƙunshi kowane na'urorin lantarki masu aiki da kayan wutan lantarki ba. Dukkansu sun ƙunshi na'urori marasa amfani kamar na'urori masu rarrabawa (Splitter). Kudin gudanarwa, kulawa da aiki ba su da yawa.
Halayen fasaha na EPON da GPON
EPON yana nufin dacewa da fasahar Ethernet na yanzu. Ci gaba ne na ka'idar 802.3 akan hanyar sadarwa ta hanyar gani. Yana da cikakkiyar gadar fa'idodin ƙananan farashin Ethernet, ƙa'idodi masu sassauƙa, da fasaha mai girma. Yana da kasuwa mai fadi da dacewa mai kyau. GPON yana matsayi a cikin masana'antar sadarwa don buƙatun sabis da yawa, samun cikakken sabis tare da garantin QoS, kuma yana ƙoƙarin nemo mafita mafi kyau wanda ke tallafawa duk sabis kuma yana da mafi girman inganci, yana ba da shawarar "buɗewa da cikakkiyar sake duba duk yarjejeniyoyin a fili. ".
Halayen fasaha na EPON sune kamar haka:
1) Ethernet shine mafi kyawun mai ɗaukar hoto don ɗaukar ayyukan IP;
2) Mai sauƙi mai sauƙi, mai sauƙi don fadadawa, sauƙin haɓakawa;
3) Kayan aikin EPON ya balaga kuma yana samuwa. EPON ya shimfida miliyoyin layi a Asiya. An ƙaddamar da kwakwalwan kasuwanci na ƙarni na uku. Farashin kayayyaki masu alaƙa da kwakwalwan kwamfuta sun ragu sosai, sun kai ma'auni na amfani da kasuwanci, wanda zai iya saduwa da buƙatun kasuwancin broadband na kwanan nan;
4) Ka'idar EPON mai sauƙi ne kuma farashin aiwatarwa yana da ƙasa, kuma farashin kayan aiki yana da ƙasa. Ana buƙatar fasaha mafi dacewa a cikin hanyar sadarwar metro, ba fasaha mafi kyau ba;
5) Mafi dacewa da gida, cibiyar sadarwa na yanki ba tare da ATM ko nauyin kayan aiki na BPON ba;
6) Mafi dacewa da gaba, IP yana ɗaukar duk ayyuka, kuma Ethernet yana ɗaukar ayyukan IP.
Halayen fasaha na GPON sune kamar haka:
1) Samun hanyar sadarwa don ayyukan sadarwa;
2) Babban bandwidth: ƙimar layi, ƙasa 2.488Gb / s, sama 1.244Gb / s; 3) Babban haɓakar watsawa: ƙananan hali 94% (ainihin bandwidth har zuwa 2.4G) halayen babba 93% (manyan bandwidth na gaske har zuwa 1.1G);
3) Cikakken goyon bayan sabis: Ma'auni na G.984.X yana ƙayyadaddun goyon bayan cikakken sabis na mai ɗauka (murya, bayanai da bidiyo);
4) Ƙarfin sarrafawa mai ƙarfi: tare da ayyuka masu wadata, isassun yankin OAM an tanada shi a cikin tsarin firam, kuma an tsara matakan OMCI;
5) Babban ingancin sabis: matakan QoS da yawa na iya tabbatar da ƙimar bandwidth da buƙatun jinkiri na kasuwancin;
6) Low m farashin: Dogon watsa nesa da babban rabo rabo, wanda yadda ya kamata rarrabaOLTfarashi kuma yana rage farashin samun damar mai amfani.
Wanne ya fi kyau, EPON vs GPON?
1. Ka'idodin da EPON da GPON suka ɗauka sun bambanta. Ana iya cewa GPON ya fi ci gaba kuma yana iya watsa ƙarin bandwidth, kuma yana iya kawo ƙarin masu amfani fiye da EPON. GPON ya samo asali ne daga farkon fasahar APON \ BPON na sadarwar fiber optic, wanda aka samo asali daga wannan. Ana amfani da tsarin firam ɗin ATM don watsa rafin lambar. E na EPON yana nufin Ethernet mai haɗin gwiwa, don haka a farkon haihuwar EPON, ana buƙatar samun damar haɗa kai tsaye da Intanet ba tare da matsala ba, don haka rafin lambar EPON shine tsarin tsarin Ethernet. Tabbas, don daidaitawa da watsawa akan fiber na gani, tsarin firam ɗin da EPON ya ayyana yana nannade waje da firam ɗin tsarin firam ɗin Ethernet.
2. Ma'auni na EPON shine IEEE 802.3ah. Babban ka'idar IEEE don tsara ma'auni na EPON shine daidaita EPON a cikin gine-ginen 802.3 gwargwadon yuwuwar, da fadada ka'idar MAC na daidaitaccen Ethernet zuwa mafi ƙarancin iyaka.
3. Ma'auni na GPON shine jerin ma'auni na ITU-TG.984. Ƙirƙirar ma'auni na GPON yayi la'akari da goyan bayan sabis na TDM na gargajiya kuma yana ci gaba da amfani da ƙayyadaddun tsarin firam na 125ms don kula da ci gaban lokaci na 8K. Domin tallafawa ka'idoji masu yawa kamar ATM, GPON yana bayyana sabon tsarin rufewa GEM: GPONEncapsulaTionMethod. Ana iya gaurayawan bayanan ATM da sauran ka'idoji kuma a sanya su cikin firam.
4. Dangane da aikace-aikacen, GPON yana da girman bandwidth fiye da EPON, mai ɗaukar sabis ɗinsa ya fi dacewa, kuma ikon rarrabawar gani yana da ƙarfi. Yana iya watsa ayyukan bandwidth mafi girma, fahimtar ƙarin damar mai amfani, mai da hankali ga sabis da yawa da garantin QoS, amma cimma ƙari Yana da rikitarwa, wanda ke haifar da farashin sa ya fi na EPON, amma tare da manyan turawa. na fasahar GPON, bambancin farashi tsakanin GPON da EPON yana raguwa sannu a hankali.