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 nthawi yogawanitsa ndi onseONUs, aliyenseONUikhoza kutumiza deta mkati mwa zenera la nthawi yodziwika. Chifukwa chake, njira ya EPON yakumtunda imatumiza ma siginecha ophulika, omwe amafunikira kugwiritsa ntchito zida zowunikira zomwe zimathandizira ma siginecha akuphulika.ONUndiZithunzi za OLT.

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 amachepetsa chiwerengero cha lasers chofunika ndi ofesi chapakati, ndiOLTamagawidwa ndi ambiriONUogwiritsa. 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

Pofuna kuchepetsa mtengo waONU, matekinoloje ofunikira aEPONthupi wosanjikiza anaikira paOLT, kuphatikizapo: kulunzanitsa mofulumira kwa zizindikiro zowonongeka, kugwirizanitsa maukonde, kulamulira mphamvu kwa ma modules optical transceiver, ndi kulandila kosinthika.

Popeza chizindikiro analandira ndiOLTndi chizindikiro chophulika cha aliyenseONU, ndiOLTayenera kukwaniritsa kalunzanitsidwe 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. Kuphatikiza apo, chifukwa cha mtunda wosiyanasiyana wa aliyenseONUkuchokera kuOLT, kwa module yolandila yaOLT, mphamvu ya mipata yosiyanasiyana ya nthawi ndi yosiyana. M'mapulogalamu a DBA, ngakhale mphamvu ya nthawi yomweyo imakhala yosiyana, yomwe imatchedwa zotsatira zapafupi. Chifukwa chake, aOLTiyenera kusintha mwachangu mfundo zake za "0" ndi "1" mulingo. Pofuna kuthetsa "zotsatira zapafupi", ndondomeko yoyendetsera mphamvu yaperekedwa, ndiOLTamadziwitsa zaONUza kuchuluka kwa mphamvu zotumizira kudzera pamapaketi oyendetsa ndi kukonza (OAM) pambuyo poyambira. Chifukwa chiwembu ichi chidzawonjezera mtengo wa ONU ndi zovuta za protocol ya thupi, ndikuchepetsa kufalikira kwa mzere kuONUmlingo wakutali kwambiri ndiOLT, sichinavomerezedwe ndi gulu la EFM.