Chii chinonzi GPON?
GPON (Gigabit-Capable PON) tekinoroji ndiyo yazvino chizvarwa chebroadband passive optical integrated access standard yakavakirwa paITU-TG.984.x mwero. Iyo ine akawanda mabhenefiti akadai seyakakwira bandwidth, kushanda kwepamusoro, kufukidzwa kukuru, uye hupfumi hwevashandisi. Vazhinji vashandisi vanoiona seyakanaka tekinoroji kuona Broadband uye yakazara shanduko yekuwana network masevhisi.
GPON yakatanga kurongedzerwa nesangano reFSAN munaSeptember 2002. Pachikonzero ichi, ITU-T yakapedza kuumbwa kweITU-T G.984.1 uye G.984.2 muna March 2003, uye yakapedzisa G.984.1 uye G.984.2 munaFebruary naJune. 2004. 984.3 standardization. Saka pakupedzisira vakaumba mhuri yakajairika yeGPON.
Iyo yakakosha chimiro chemidziyo yakavakirwa paGPON tekinoroji yakafanana neyePON iripo. Inoumbwa zvakareOLT(Optical line terminal) pahofisi yepakati uye ONT/ONU(optical network terminal kana inonzi optical network unit) padivi remushandisi. ODN (Optical Distribution Network) inoumbwa neSM fiber uye passive splitter (Splitter) uye network manejimendi system.
Kune mamwe maPON mwero, chiyero cheGPON chinopa bandwidth yakakwira isati yamboonekwa, ine mwero wepasi unosvika 2.5Gbit/s, uye hunhu hwayo hweasymmetric hunogona kuenderana nemusika wesevhisi yedhata. Inopa yakazara sevhisi vimbiso yeQoS, uye inotakura ATM maseru uye (kana) GEM mafuremu panguva imwe chete. Iyo ine kugona kwakanaka kwekupa masevhisi mazinga, inotsigira QoS vimbiso uye yakazara sevhisi kuwana. Paunenge uchitakura mafuremu eGEM, masevhisi eTDM anogona kuiswa kuGEM mafuremu, uye akajairwa 8kHz (125μs) mafuremu anogona kutsigira zvakananga TDM masevhisi. Seye telecommunication-level tekinoroji chiyero, GPON inotsanangudzawo nzira yekudzivirira uye yakazara OAM mabasa padanho retiweki yekuwana.
Mune chiyero cheGPON, mhando dzemasevhisi anoda kutsigirwa anosanganisira masevhisi edatha (Ethernet masevhisi, anosanganisira IP masevhisi uye MPEG vhidhiyo hova), PSTN masevhisi (POTS, ISDN masevhisi), mitsara yakatsaurirwa (T1, E1, DS3, E3, uye ATM masevhisi). ) Uye vhidhiyo masevhisi (digital vhidhiyo). Multi-sevhisi muGPON akaiswa mepu kune ATM maseru kana GEM mafuremu ekufambisa, ayo anogona kupa anoenderana QoS vimbiso yemhando dzakasiyana dzesevhisi.