1.1 Passive Optical splitter

Passive Optical splitter ndi gawo lofunikira pa netiweki ya PON.Ntchito ya passive optical splitter ndiyo kugawa mphamvu ya kuwala ya chizindikiro chimodzi cholowetsa muzotulutsa zingapo.Nthawi zambiri, chogawa chimakwaniritsa kugawanika kwa kuwala kuchokera pa 1: 2 mpaka 1:32 kapena 1:64.Makhalidwe a passive optical splitter ndikuti safuna magetsi ndipo ali ndi kusinthika kwamphamvu kwachilengedwe.Popeza tchanelo cha EPON chokwera ndi chogawanitsa nthawi ndi onseONUs, ONU iliyonse imatha kutumiza deta mkati mwa zenera la nthawi.Choncho, njira ya EPON yopita kumtunda imatumiza zizindikiro zowonongeka, zomwe zimafuna kugwiritsa ntchito zipangizo zamagetsi zomwe zimathandizira zizindikiro zowonongeka mu ONUs ndi OLTs.

Passive Optical splitter mu ma network a PON nthawi zambiri amagawidwa m'mitundu iwiri: chogawa chamtundu wamtundu wa taper ndi chogawa chatsopano chomwe chikutuluka chatsopano.

1.2 Kukula kwakuthupi

Mauthenga a EPON amatenga ndondomeko ya mfundo-to-multipoint topology m'malo mwa ndondomeko ya mfundo, yomwe imapulumutsa kwambiri kuchuluka kwa optical fiber ndi ndalama zoyendetsera.PONOLTzida zimachepetsa kuchuluka kwa ma lasers ofunikira ndi ofesi yapakati, ndipo OLT imagawidwa ndi ogwiritsa ntchito ambiri a ONU.Kuphatikiza apo, EPON imagwiritsa ntchito umisiri wa Efaneti ndi mafelemu wamba a Efaneti kunyamula utumiki waposachedwa—utumiki wa IP popanda kutembenuza kulikonse.

1.3 Kulunzanitsa kophulika kwa EPON wosanjikiza

Kuti muchepetse mtengo wa ONU, matekinoloje ofunikira aEPONzosanjikiza zakuthupi zimakhazikika pa OLT, kuphatikiza: kulunzanitsa mwachangu kwa ma siginecha ophulika, kulumikizana kwa maukonde, kuwongolera mphamvu kwa ma module optical transceiver, ndikulandila kosinthika.

Popeza chizindikiro cholandilidwa ndi OLT ndi chizindikiro chophulika cha ONU iliyonse, OLT iyenera kukwaniritsa kugwirizanitsa gawo mu nthawi yochepa, ndiyeno kulandira deta.Kuphatikiza apo, chifukwa njira ya uplink imatengera mawonekedwe a TDMA, ndipo ukadaulo wa 20km optical fiber transmission kuchedwa kumazindikira nthawi yolumikizana ndi netiweki yonse, mapaketi a data amafika pa nthawi yomwe imatsimikiziridwa ndi algorithm ya OBA.Kuonjezera apo, chifukwa cha mtunda wosiyana wa ONU iliyonse kuchokera ku OLT, kwa gawo lolandira la OLT, mphamvu ya nthawi yosiyana ndi yosiyana.M'mapulogalamu a DBA, ngakhale mphamvu ya nthawi yomweyo imakhala yosiyana, yomwe imatchedwa zotsatira zapafupi.Chifukwa chake, OLT iyenera kusintha mwachangu mfundo zake za "0" ndi "1" mulingo.Pofuna kuthetsa "zotsatira zakutali", ndondomeko yoyendetsera mphamvu yakhazikitsidwa, ndipo OLT imadziwitsa ONU ya mlingo wamagetsi otumizira kudzera mu mapaketi oyendetsa ntchito ndi kukonza (OAM) pambuyo poyambira.Chifukwa chiwembuchi chidzawonjezera mtengo wa ONU ndi zovuta za ndondomeko ya thupi, ndikuchepetsa ntchito yotumizira mzere ku mlingo wa ONU kutali kwambiri ndi OLT, sichinatengedwe ndi gulu logwira ntchito la EFM.