OLTTerminal layin gani ne,ONUnaúrar cibiyar sadarwa ce ta gani (ONU), dukkansu kayan aikin sadarwa ne na sadarwa na gani. Nau'o'i biyu ne masu mahimmanci a cikin PON: PON (Passive Optical Network: passive Optical Network). PON (cibiyar sadarwar gani mara kyau) tana nufin (cibiyar rarraba gani na gani) baya ƙunsar kowace na'urorin lantarki da wutar lantarki, ODN ta ƙunshi na'urori marasa amfani kamar na'urar rarrabawar gani (Splitter), baya buƙatar kayan aikin lantarki masu tsada. Cibiyar sadarwa mai saurin gani ta haɗa da tashar tashar layin gani (OLT) shigar a tsakiyar tashar sarrafawa, da kuma rukunin masu tallafawa na'urorin cibiyar sadarwa na gani (ONU) shigar a shafin mai amfani. Cibiyar rarrabawar gani (ODN) tsakaninOLTkumaONUyana ƙunshe da filaye na gani da masu rarrabawa ko ma'aurata.
Masu ba da hanya tsakanin hanyoyin sadarwakumamasu sauyawakayan aikin musayar bayanai ne.
ODN (Network Distribution Network) cibiyar sadarwa ce ta kebul na gani na FTTH bisa kayan aikin PON. Matsayinsa shine samar da tashar watsawa ta gani tsakaninOLTda kumaONU. Daga ra'ayi na aiki, ODN za a iya raba zuwa sassa hudu: na'ura mai ba da hanya tsakanin hanyoyin sadarwa na USB, na'ura mai ba da hanya tsakanin hanyoyin sadarwa na USB, da na cikin gida na USB Tantancewar na USB subsystem da Tantancewar fiber m subsystem daga ofishin karshen zuwa karshen mai amfani.
ONT wani bangare ne naONU.
FTTB "Fiber na gani zuwa ginin", 16ONUana sanya su a cikin akwatin naúrar a cikin corridor. Akwai 16 ONT a cikinONU. Kowane ONT yana fitar da kebul na cibiyar sadarwa (siginar lantarki) kuma ya kai kowane ƙarshen mai amfani ta hanyar kebul na cibiyar sadarwa a cikin corridor.
FTTH “fiber-to-the-gida”, saka 1 zuwa 16 splitter a cikin akwatin naúrar a cikin corridor, sannan isa ga kowane mai amfani ta cikin fiber da aka rufe a cikin corridor, kuma kowane mai amfani yana ƙare ONT. Yayi daidai da tarwatsawaONU, don haka kayan aikin tashar ya kasance kusa da mai amfani mara iyaka.
Ana iya fahimtar ONT azamanONUtare da tashar jiragen ruwa guda ɗaya kawai.