ONU (Optical Network Unit) Chigawo cha netiweki ya Optical, ONU imagawidwa m'magulu awiri: active optical network unit ndi passive optical network unit. Kawirikawiri, zida zomwe zili ndi olandila optical, uplink optical transmitters, ndi ma bridge amplifier angapo owunikira netiweki zimatchedwa optical node. PON imagwiritsa ntchito ulusi umodzi wolumikizira ku OLT, kenako OLT imalumikizidwa ku ONU. ONU imapereka ntchito monga deta, IPTV (Interactive Internet TV), mawu (pogwiritsa ntchito IAD, Integrated Access Device), ndipo imakwaniritsadi mapulogalamu "osewera katatu".
Ponseponse, zipangizo za ONU zitha kugawidwa m'magulu malinga ndi zochitika zosiyanasiyana monga SFU, HGU, SBU, MDU, ndi MTU.
1. Kutumiza kwa ONU ya mtundu wa SFU
Ubwino wa njira yotumizira mauthengayi ndikuti zinthu zomwe zili mu netiwekiyi ndi zambiri, ndipo ndizoyenera mabanja odziyimira pawokha pa FTTH. Itha kuwonetsetsa kuti ogwiritsa ntchito ali ndi ntchito zolumikizirana pa intaneti, koma sizimakhudza ntchito zovuta zolowera kunyumba. SFU m'malo awa ili ndi mitundu iwiri yofanana: kupereka madoko a Ethernet ndi madoko a POTS; ndikupereka madoko a Ethernet okha. Tiyenera kudziwa kuti SFU m'mitundu yonse iwiri imatha kupereka ntchito za chingwe cha coaxial kuti ikwaniritse ntchito za CATV, komanso ingagwiritsidwenso ntchito ndi ma gateway a kunyumba kuti ithandizire kupereka ntchito zowonjezera phindu. Izi zikugwiranso ntchito kwa mabizinesi omwe safunika kusinthana deta ya TDM.
2. Kutumiza kwa ONU kwa mtundu wa HGU
Njira yogwiritsira ntchito HGU type ONU terminal ndi yofanana ndi ya SFU, koma ntchito za ONU ndi RG zimaphatikizidwa mu hardware. Poyerekeza ndi SFU, imatha kugwira ntchito zovuta kwambiri zowongolera ndi kuyang'anira. Munkhaniyi yogwiritsira ntchito, mawonekedwe owoneka ngati U amamangidwa mu chipangizocho ndipo sapereka mawonekedwe. Ngati zida za xDSLRG zikufunika, mitundu yambiri ya mawonekedwe amatha kulumikizidwa mwachindunji ku netiweki yakunyumba, zomwe ndizofanana ndi chipata chakunyumba chokhala ndi mawonekedwe a EPON uplink. Imagwiritsidwa ntchito pazochitika za FTTH.
3. Kutumiza kwa ONU kwa mtundu wa SBU
Yankho lokhazikitsa ili ndi loyenera kwambiri pakupanga netiweki ya ogwiritsa ntchito mabizinesi odziyimira pawokha mu FTTO application mode, ndipo ndi kusintha kwa bizinesi kutengera zochitika za SFU ndi HGU deployment. Netiweki yomwe ili pansi pa deployment iyi imatha kuthandizira ntchito ya broadband access terminal ndikupatsa ogwiritsa ntchito mitundu yosiyanasiyana ya data interfaces kuphatikiza El interface, Ethernet interface, ndi POTS interface, zomwe zingakwaniritse zosowa za mabizinesi pakulankhulana kwa data, kulankhulana kwa mawu, ndi ntchito zachinsinsi za TDM. Zofunikira pakugwiritsa ntchito. Ma interface opangidwa ndi U m'chilengedwe amatha kupatsa mabizinesi mawonekedwe a chimango chokhala ndi mawonekedwe osiyanasiyana, ndipo ntchitoyo ndi yamphamvu kwambiri.
4. Kutumiza kwa ONU kwa mtundu wa MDU
Njira yotumizira deta iyi ndi yoyenera kupanga netiweki pogwiritsa ntchito njira zambiri monga FTTC, FTTN, FTTCab, ndi FTTZ. Ngati ogwiritsa ntchito pamlingo wamakampani sakufuna ntchito za TDM, njira iyi ingagwiritsidwenso ntchito potumiza netiweki ya EPON. Njira yotumizira deta iyi ikhoza kupatsa ogwiritsa ntchito ambiri ntchito zolumikizirana ndi deta ya broadband kuphatikiza ntchito za Ethernet/IP, ntchito za VoIP, ndi ntchito za CATV ndi njira zina zambiri zotumizira deta, ndipo ili ndi mphamvu yotumizira deta yamphamvu. Chida chilichonse cholumikizirana chimatha kufanana ndi wogwiritsa ntchito netiweki, kotero poyerekeza, kuchuluka kwa magwiritsidwe ntchito a netiweki yake kumakhala kokwera.
5. Kutumiza kwa ONU kwa mtundu wa MTU
Njira yothetsera vutoli ndi kusintha kwa malonda kutengera njira yothetsera vutoli ya MDU. Ikhoza kupatsa ogwiritsa ntchito mabizinesi ambiri mautumiki osiyanasiyana a interface kuphatikiza ma Ethernet interfaces ndi ma POTS interfaces, ndipo imatha kukwaniritsa mautumiki osiyanasiyana monga mawu, deta, ndi mautumiki a TDM omwe amafunikira. Ngati kapangidwe ka slot-type kagwiritsidwa ntchito pamodzi, ntchito zamabizinesi zolemera komanso zamphamvu zitha kuchitika.
Nthawi yotumizira: Julayi-20-2023