Chii chinonzi GPON?
GPON (Gigabit-Capable PON) tekinoroji ndiyo yazvino chizvarwa chebroadband passive optical integrated access standard yakavakirwa paITU-TG.984.x mwero.Iine mabhenefiti akawanda akadai seyepamusoro bandwidth, kushanda kwepamusoro, kufukidzwa kukuru, hupfumi hwevashandisi, etc. Vazhinji vashandisi vanoiona sehunyanzvi hwekuita tekinoroji yekuwana Broadband uye yakasanganiswa shanduko yekuwana network masevhisi.
GPON yakatanga kurongedzerwa nesangano reFSAN munaSeptember 2002. Kubva pane izvi, ITU-T yakapedza kugadzirwa kweITU-T G.984.1 uye G.984.2 muna March 2003, uye yakapedza G. muna February naJune 2004. Standardization ye984.3 .Saka, mhuri yakajairika yeGPON inozopedzisira yaumbwa.
Mamiriro ekutanga emuchina wakavakirwa paGPON tekinoroji yakafanana neyePON iripo.Iri zvakare OLT (Optical line terminal) yehofisi yepakati, iyo ONT / ONU yemushandisi yekupedzisira (iyo optical network terminal kana optical network unit), uye yekutanga michina miviri yakabatana neiyo chete modhi.Iyo optical fiber (SM fiber) uye passive splitter (Splitter) inoumbwa neODN (Optical Distribution Network) uye network manejimendi system.
Kune mamwe maitiro ePON, iyo GPON chiyero inopa isina kumbobvira yakamboitwa yakakwirira bandwidth ine downlink rate inosvika 2.5 Gbit/s, uye ayo asymmetric maitiro anonyanya kukodzera kumusika webasa re data rebroadband.Inopa vimbiso yakazara yebasa reQoS, uye inotakura masero eATM. uye/kana GEM mafuremu.Iyo ine yakanaka sevhisi level, QoS garandi uye yakazara sevhisi kuwana.Paunenge uchitakura mafaira eGEM, masevhisi eTDM anogona kuiswa muGEM mafuremu, uye akajairwa 8 kHz (125 μs) mafuremu anogona kutsigira zvakananga TDM masevhisi.Semutakuri-kirasi tekinoroji mwero, GPON inotsanangudzawo nzira dzekudzivirira uye yakazara OAM mabasa padanho retiweki yekuwana.
Mune chiyero cheGPON, marudzi emasevhisi anoda kutsigirwa anotsanangurwa zvakajeka: data masevhisi (Ethernet masevhisi, anosanganisira IP masevhisi uye MPEG vhidhiyo hova), PSTN masevhisi (POTS, ISDN masevhisi), uye yakatsaurirwa mitsara (T1, E1, DS3, E3, uye ATM masevhisi).) uye masevhisi evhidhiyo (digital vhidhiyo).Multi-sevhisi muGPON akaiswa mamepu kune ATM maseru kana GEM mafuremu ekufambisa, achipa anowirirana QoS vimbiso yemhando dzakasiyana dzesevhisi.