OLTke terminal ea optical line,ONUke optical network unit (ONU), kaofela ke lisebelisoa tsa khokahano ea marang-rang ea optical transmission. Ke li-module tse peli tse hlokahalang ho PON: PON (Passive Optical Network: passive optical network). PON (passive optical network) e bua ka (network optical distribution) ha e na lisebelisoa leha e le life tsa elektronike le matla a motlakase, ODN e entsoe ka lisebelisoa tse sa sebetseng tse kang optical splitter (Splitter), ha e hloke lisebelisoa tsa elektronike tse sebetsang ka theko e boima. A passive optical network e kenyelletsa terminal ea optical line (OLT) e kentsoeng seteisheneng sa taolo e bohareng, le sehlopha sa lisebelisoa tsa marang-rang tsa optical (Li-ONU) e kentsoeng sebakeng sa mosebelisi. The optical distribution network (ODN) pakeng tsaOLTleONUe na le likhoele tsa optical le li-splitter tse sa sebetseng kapa li-couplers.
Li-routersleli-switcheske lisebelisoa tsa phapanyetsano ea data.
ODN (Optical Distribution Network) ke FTTH optical cable network e thehiloeng ho thepa ea PON. Karolo ea eona ke ho fana ka mocha oa phetiso ea optical pakeng tsaOLTle eaONU. Ho latela pono ea ts'ebetso, ODN e ka aroloa likarolo tse 'ne: mochini o fepang optical cable subsystem, sistimi e tsamaisang optical cable, indoor cable optical subsystem le optical fiber terminal subsystem ho tloha pheletsong ea ofisi ho isa pheletsong ea mosebelisi.
ONT ke karolo ea bohlokoa eaONU.
FTTB "fiber optical ho ea mohahong", 16Li-ONUli behiloe ka har'a lebokose la yuniti phasejeng. Ho na le li-ONT tse 16 hoONU. E 'ngoe le e' ngoe ea ONT e hlahisa thapo ea marang-rang (letšoao la motlakase) 'me e fihla pheletsong e 'ngoe le e' ngoe ea mosebelisi ka mohala oa marang-rang ka har'a coridor.
FTTH "fiber-to-the-hae", beha 1 ho 16 splitter ka lebokoseng la yuniti phasejeng, 'me joale fihla mosebedisi e mong le e ka faeba e koahetsoeng ka phasejeng,' me mosebedisi e mong le e mong o felisa ONT. E lekana le ho qhaqha theONU, e le hore thepa ea ho qetela e be haufi haholo le mosebedisi.
ONT e ka utloisisoa e leONUe nang le kou e le 'ngoe feela.