Kodi mawonekedwe a netiweki a Optical Access Network (OAN) ndi chiyani?
Optical access network (OAN) imatanthawuza kugwiritsa ntchito kuwala kwa fiber ngati njira yayikulu yotumizira kuzindikira ntchito yotumizira uthenga pa netiweki yofikira. Imalumikizidwa ku node yautumiki kudzera pa optical line terminal (OLT), ndikulumikizidwa ndi wogwiritsa ntchito kudzera pa optical network unit (ONU). The optical fiber access network imaphatikizapo zida zakutali-optical network unit ndi central office equipment-optical line terminal, zomwe zimalumikizidwa ndi zida zotumizira.Zigawo zazikulu za dongosololi ndiOLTndi kutaliONU.Amamaliza kutembenuka kwa ma protocol a signing kuchokera ku service node interface (SNI) kupita ku network network interface (UNI) mu network yonse yofikira. Chipangizo chofikira pachokha chimakhalanso ndi maukonde ndipo chimatha kupanga mitundu yosiyanasiyana ya netiweki topology. Pa nthawi yomweyo, zipangizo mwayi alinso ndi ntchito za yokonza m'deralo ndi kutali centralized kuyan'anila, kupanga yokonza kasamalidwe maukonde kudzera mandala kuwala kufala, ndi kubweretsa izo mu malo maukonde kasamalidwe kasamalidwe ogwirizana kudzera lolingana maukonde kasamalidwe protocol.
Udindo waOLTndikupereka mawonekedwe pakati pa netiweki yofikira ndi amderalokusintha, ndi kuyankhulana ndi optical network unit kumbali ya wogwiritsa ntchito kupyolera mu kuwala. Imalekanitsa kwathunthu ntchito yosinthira yakusinthakuchokera kwa ogwiritsa ntchito. The optical line terminal imapereka chisamaliro ndi kuyang'anira yokha komanso kutha kwa wogwiritsa ntchito. Ikhoza kuikidwa mwachindunji kumapeto kwa ofesi yosinthanitsa pamodzi ndi kusinthanitsa kwapafupi, kapena ikhoza kukhazikitsidwa kumapeto kwakutali.
Ntchito yaONUndikupereka mawonekedwe a mbali ya ogwiritsa ntchito pa netiweki yofikira. Ikhoza kugwirizanitsidwa ndi ma terminals osiyanasiyana ogwiritsira ntchito, ndipo panthawi imodzimodziyo imakhala ndi ntchito yotembenuza photoelectric ndi ntchito yofanana yokonza ndi kuyang'anira. Ntchito yaikulu yaONUndi kuthetsa ulusi wa kuwala kwaOLT, gwiritsani ntchito chizindikiro cha kuwala ndikupereka njira zolumikizirana ndi mabizinesi ang'onoang'ono angapo, ogwiritsa ntchito mabizinesi ndi ogwiritsa ntchito kunyumba. Mapeto a netiweki aONUndi mawonekedwe owoneka bwino, ndipo mapeto ake ndi mawonekedwe amagetsi. Chifukwa chake,ONUili ndi ntchito zotembenuza za kuwala / magetsi ndi magetsi / kuwala. Ilinso ndi ntchito za digito / analogi ndi analogi / digito kutembenuka kwa zokambirana. TheONUnthawi zambiri imayikidwa pafupi ndi wogwiritsa ntchito, ndipo malo ake amakhala ndi kusinthasintha kwakukulu.
Optical Access Network (OAN) imagawidwa kukhala Active Optical Network (AON, Active Optical Network) ndi Passive Optical Network (PON, Passive Optica Optical Network) potengera kugawa kwadongosolo.
Maonekedwe a topological of network optical fiber access network amatanthauza makonzedwe a geometric a mizere yopatsira ndi mfundo. Imawonetsa malo ogwirizana komanso mawonekedwe olumikizana a node iliyonse pamaneti. Mapangidwe a topological of network ali ndi chikoka chofunikira pamaneti ntchito, mtengo ndi kudalirika. Mipangidwe itatu yofunikira ya topological ndi: yooneka ngati basi, yooneka ngati mphete ndi yooneka ngati nyenyezi. Kuchokera pa izi, mabasi-nyenyezi, nyenyezi ziwiri, mphete ziwiri, mabasi-basi ndi mafomu ena ophatikizana ophatikizika angatengedwe. Iliyonse ili ndi mawonekedwe ake komanso chowonjezera chogwirizana.