EPON ndi GPON ali ndi zoyenerera zawo.Kuchokera pamndandanda wamasewera, GPON ndi yapamwamba kuposa EPON, koma EPON ili ndi maubwino anthawi ndi mtengo.GPON ikugwira ntchito.Poyembekezera msika wam'tsogolo wofikira burodibandi, mwina sangakhale yemwe alowa m'malo mwa yemwe, ayenera kukhala limodzi komanso wogwirizana.Kwa bandwidth, mautumiki ambiri, QoS yapamwamba ndi zofunikira za chitetezo, ndi makasitomala omwe ali ndi teknoloji ya ATM monga makina a msana, GPON idzakhala yoyenera.Kwa makasitomala otsika mtengo, QoS, komanso magulu amakasitomala otsika, EPON yakhala yopambana.
Kodi PON ndi chiyani?
Ukadaulo wofikira pa Broadband ukuchulukirachulukira, womwe ukuyembekezeka kukhala bwalo lankhondo komwe utsi sudzatha.Pakali pano, zoweta zoweta akadali ADSL luso, koma ochulukirachulukira opanga zida ndi opareshoni atembenukira ku luso kuwala maukonde kupeza.
Mitengo yamkuwa ikupitirirabe kukwera, mitengo yamtengo wapatali ya optical ikupitiriza kutsika, ndipo kufunikira kwa bandwidth kuchokera ku IPTV ndi masewera a masewera a kanema kumayendetsa chitukuko cha FTTH.Kuyembekezeka kowala kosintha zingwe za coaxial zamkuwa ndi mawaya ndi zingwe zowonekera, telefoni, TV yachingwe, ndi ma data atatu a Broadband data zimawonekera bwino.
PON (Passive OpTIcal Network) passive Optical network ndiye ukadaulo waukulu wofikira FTTH CHIKWANGWANI kunyumba, kupereka mfundo-to-multipoint CHIKWANGWANI mwayi.Monga momwe tawonetsera pa Chithunzi 1, ili ndi OLT (optical line terminal) kumbali ya ofesi ndi mbali ya wogwiritsa Ntchito Yopangidwa ndi ONU (Optical Network Unit) ndi ODN (Optical Distribution Network).Nthawi zambiri, kumunsi kwa mtsinje kumagwiritsa ntchito kuwulutsa kwa TDM ndipo kumtunda kumagwiritsa ntchito TDMA (Time Division Multiple Access) kuti apange chithunzithunzi chamitengo yamitengo.PON, monga malo owoneka bwino kwambiri aukadaulo wofikira, ndi "yopanda".ODN ilibe zida zamagetsi zamagetsi ndi zida zamagetsi zamagetsi.Onsewa amapangidwa ndi zida zopanda pake monga ma optical splitters (Splitter).Ndalama zoyendetsera, kukonza ndi kuyendetsa ndizotsika.
Makhalidwe aukadaulo a EPON ndi GPON
EPON ikufuna kuti ikhale yogwirizana ndiukadaulo wamakono wa Ethernet.Ndiko kupitiriza kwa protocol ya 802.3 pa intaneti yofikira.Imatengera kwathunthu zabwino zamitengo yotsika ya Ethernet, ma protocol osinthika, komanso ukadaulo wokhwima.Ili ndi msika waukulu komanso wogwirizana bwino.GPON ili pakampani yolumikizirana ndi matelefoni kuti ikwaniritse zosowa za mautumiki ambiri, mwayi wopezeka ndiutumiki wathunthu ndi chitsimikizo cha QoS, ndipo imayesetsa kupeza yankho labwino lomwe limathandizira mautumiki onse ndipo limagwira ntchito bwino kwambiri, likufuna "kuwunikiranso momasuka ndi kwathunthu mapangano onse poyera. ”.
Makhalidwe aukadaulo a EPON ndi awa:
1) Efaneti ndiye chonyamulira chabwino kwambiri chonyamula mautumiki a IP;
2) Kukonza kosavuta, kosavuta kukulitsa, kosavuta kukweza;
3) Zida za EPON ndizokhwima komanso zilipo.EPON yayika mizere mamiliyoni ambiri ku Asia.Chips zamalonda za m'badwo wachitatu zakhazikitsidwa.Mitengo ya optical modules yokhudzana ndi tchipisi yatsika kwambiri, kufika pamlingo wa ntchito zamalonda, zomwe zingathe kukwaniritsa zofunikira zamalonda zaposachedwa;
4) Protocol ya EPON ndi yophweka ndipo mtengo wa kukhazikitsa ndi wotsika, ndipo mtengo wa zipangizo ndi wotsika.Ukadaulo woyenera kwambiri umafunika pa netiweki ya metro, osati ukadaulo wabwino kwambiri;
5) More oyenera zoweta, mzinda maukonde m'dera popanda ATM kapena BPON zida katundu;
6) Zoyenera mtsogolo, IP imanyamula mautumiki onse, ndipo Ethernet imanyamula mautumiki a IP.
Makhalidwe aukadaulo a GPON ndi awa:
1) Kufikira maukonde ogwirira ntchito pa telecom;
2) Kuthamanga kwakukulu: mlingo wa mzere, kumtunda kwa 2.488Gb / s, kumtunda kwa 1.244Gb / s;3) Kutumiza kwakukulu: khalidwe lotsika 94% (chiwerengero chenichenicho mpaka 2.4G) khalidwe lapamwamba 93% (chiwerengero chenichenicho mpaka 1.1G);
3) Thandizo la utumiki wathunthu: Muyezo wa G.984.X umatanthawuza mosamalitsa chithandizo cha mautumiki athunthu (mawu, deta ndi kanema);
4) Kuwongolera mwamphamvu: ndi ntchito zolemera, dera lokwanira la OAM limasungidwa mu chimango, ndipo miyezo ya OMCI imapangidwa;
5) Utumiki wapamwamba kwambiri: magawo angapo a QoS amatha kutsimikizira mosamalitsa bandwidth ndi kuchedwa kwa bizinesi;
6) Mtengo wotsika kwambiri: Mtunda wautali wotumizira ndi chiŵerengero chogawanika chachikulu, chomwe chimagawira bwino ndalama za OLT ndikuchepetsa mtengo wogwiritsa ntchito.
Chabwino nchiyani, EPON vs GPON?
1. Miyezo yotengedwa ndi EPON ndi GPON ndi yosiyana.Zinganenedwe kuti GPON ndi yotsogola kwambiri ndipo imatha kutumiza ma bandwidth ambiri, ndipo imatha kubweretsa ogwiritsa ntchito ambiri kuposa EPON.GPON idachokera kuukadaulo woyambirira wa APON \ BPON wa kulumikizana kwa fiber optical, yomwe idapangidwa kuchokera ku izi.Mtundu wa chimango wa ATM umagwiritsidwa ntchito kufalitsa ma code stream.E ya EPON imatanthawuza ku Ethernet yolumikizidwa, kotero kumayambiriro kwa kubadwa kwa EPON, kunali kofunikira kuti athe kulumikiza mwachindunji ndi intaneti, kotero kuti mtsinje wa code wa EPON ndi mawonekedwe a Ethernet.Inde, kuti agwirizane ndi kufala kwa kuwala kwa kuwala, mawonekedwe a chimango omwe amafotokozedwa ndi EPON amakulungidwa kunja kwa mawonekedwe a Ethernet frame format.
2. Muyezo wa EPON ndi IEEE 802.3ah.Mfundo yayikulu ya IEEE popanga muyezo wa EPON ndikukhazikitsa EPON mkati mwa 802.3 zomangamanga momwe mungathere, ndikukulitsa protocol ya MAC ya Ethernet yokhazikika mpaka pang'ono.
3. Muyezo wa GPON ndi mndandanda wa miyezo ya ITU-TG.984.Kupanga mulingo wa GPON kumaganizira za chithandizo chachikhalidwe cha TDM ndipo akupitilizabe kugwiritsa ntchito mawonekedwe a 125ms osakhazikika kuti asunge nthawi ya 8K.Pofuna kuthandizira ma protocol ambiri monga ATM, GPON imatanthawuza mawonekedwe atsopano a encapsulation GEM: GPONEncapsulaTIonMethod.Deta ya ATM ndi ma protocol ena amatha kusakanizidwa ndikuphatikizidwa kukhala mafelemu.
4. Pogwiritsa ntchito, GPON ili ndi bandwidth yaikulu kuposa EPON, wothandizira ntchito yake ndi yothandiza kwambiri, ndipo luso lake logawanika la kuwala ndilolimba.Ikhoza kutumiza mautumiki akuluakulu a bandwidth, kuzindikira mwayi wogwiritsa ntchito zambiri, kumvetsera kwambiri mautumiki ambiri ndi chitsimikizo cha QoS, koma kukwaniritsa zambiri Ndizovuta, zomwe zimapangitsa kuti mtengo wake ukhale wokwera kwambiri kuposa wa EPON, koma ndi kutumizidwa kwakukulu. yaukadaulo wa GPON, kusiyana kwa mtengo pakati pa GPON ndi EPON kukucheperachepera.