Kedu ihe bụ nhazi netwọkụ nke Optical Access Network (OAN)
Netwọk ohere anya (OAN) na-ezo aka n'iji eriri anya dị ka isi mgbasa ozi iji ghọta ọrụ nnyefe ozi nke netwọk ịnweta.Ejikọtara ya na ọnụ ọrụ site na ọdụ eriri anya (optical line terminal).OLT), na jikọọ na onye ọrụ site na ngwa netwọk anya (ONU).The ngwa anya eriri ohere netwọk na-agụnye ime akụrụngwa-optical netwọk unit na Central ụlọ ọrụ akụrụngwa-optical akara ọnụ, nke ejikọrọ site nnyefe equipment.The isi akụkụ nke usoro bụ OLT na ime obodo.ONU.Ha na-emecha ngbanwe nke ụkpụrụ mgbaàmà site na ọrụ node interface (SNI) na netwọk ọrụ netwọk (UNI) na netwọk ohere niile.Ngwa ịnweta n'onwe ya nwekwara ike ịkparịta ụka n'Ịntanet ma nwee ike ịmepụta ụdị dị iche iche nke topology netwọk.N'otu oge ahụ, ohere akụrụngwa nwekwara ọrụ nke obodo mmezi na remote centralized nlekota oru, na-akpụ a mmezi management netwọk site transperent ngwa anya nnyefe, na-eweta ya na netwọk management center maka ịdị n'otu management site kwekọrọ ekwekọ netwọk management protocol.
Ọrụ nke OLT bụ inye ihe ntanetị n'etiti netwọk ohere na mgbanwe mpaghara, ma na-ekwurịta okwu na mpaghara netwọk anya n'akụkụ onye ọrụ site na nnyefe anya.Ọ na-ekewa kpamkpam ọrụ ngbanwe nke ngbanwe site na ịnweta onye ọrụ.Ọnụ eriri anya anya na-enye nlekọta na nlekota onwe ya na njedebe onye ọrụ.Enwere ike itinye ya ozugbo na njedebe ụlọ ọrụ mgbanwe yana mgbanwe mpaghara, ma ọ bụ enwere ike ịtọ ya na njedebe dịpụrụ adịpụ.
Ọrụ nke ONU bụ ịnye interface n'akụkụ onye ọrụ maka netwọk ịnweta.Enwere ike ijikọ ya na ọnụ ọgụgụ ndị ọrụ dị iche iche, ma n'otu oge ahụ nwere ọrụ ntụgharị fotoelectric na nhazi na nlekota ọrụ kwekọrọ.Isi ọrụ nke ONU bụ ịkwụsị eriri anya site na OLT, hazie akara ngosi anya ma nye ohere ọrụ maka ọtụtụ obere azụmaahịa, ndị ọrụ azụmaahịa na ndị ọrụ obibi.Ngwucha netwọkụ nke ONU bụ ngwa anya, na njedebe onye ọrụ ya bụ ngwa eletrik.Ya mere, ONU nwere ọrụ ntụgharị anya / eletriki na eletrik / ngwa anya.Ọ nwekwara ọrụ nke dijitalụ/analog na analọg/dijitalụ mgbanwe nke mkparịta ụka.A na-edobekarị ONU nso na onye ọrụ, yana ọnọdụ ya nwere nnukwu mgbanwe.
A na-ekewa netwọọdụ ngwa anya ngwa anya (OAN) n'ime Active Optical Network (AON, Active Optical Network) na Passive Optical Network (PON, Passive Optica Optical Network) n'ihe gbasara nkesa sistemụ.
Ọdịdị topological nke netwọk ohere eriri anya na-ezo aka na nhazi geometric nke ahịrị nnyefe na ọnụ.Ọ na-egosi ọnọdụ otu na nhazi njikọ nke ọnụ ọ bụla na netwọk.Ọdịdị topological nke netwọk nwere mmetụta dị mkpa na ọrụ netwọk, ọnụ ahịa na ntụkwasị obi.Ihe owuwu atọ ndị bụ isi nke topological bụ: ụdị ụgbọ ala, yiri mgbanaka na ụdị kpakpando.Site na nke a, enwere ike nweta bọs-kpakpando, kpakpando abụọ, mgbanaka abụọ, ụgbọ ala na ụdị ngwa ngwa ndị ọzọ jikọtara ọnụ.Nke ọ bụla nwere njirimara nke ya na mgbakwunye ibe ya.