Yintoni i-GPON?
I-GPON (i-Gigabit-Capable PON) iteknoloji yisizukulwana samva nje se-broadband passive optical edibeneyo yokufikelela umgangatho osekelwe kumgangatho we-ITU-TG.984.x.Ineenzuzo ezininzi ezinje nge-bandwidth ephezulu, ukusebenza kakuhle okuphezulu, ukugubungela okukhulu, kunye nojongano lomsebenzisi otyebileyo.Uninzi lwabasebenzisi luyijonga njengetekhnoloji efanelekileyo yokufumana ibroadband kunye nenguqu ebanzi yokufikelela kwiinkonzo zenethiwekhi.
I-GPON yaqala ukuphakanyiswa ngumbutho we-FSAN ngoSeptemba 2002. Ngesi siseko, i-ITU-T yagqiba ukuqulunqwa kwe-ITU-T G.984.1 kunye ne-G.984.2 ngo-Matshi 2003, kwaye yagqiba i-G.984.1 kunye ne-G.984.2 ngoFebruwari nangoJuni. 2004. 984.3 umgangatho.Ngaloo ndlela ekugqibeleni kwakhiwa usapho oluqhelekileyo lweGPON.
Isakhiwo esisisiseko sezixhobo ezisekelwe kwiteknoloji ye-GPON ifana ne-PON ekhoyo.Ikwaqulunqwe ne-OLT (i-terminal ye-optical line) kwi-ofisi ephakathi kunye ne-ONT / ONU (i-terminal ye-optical network okanye ebizwa ngokuba yi-optical network unit) kwicala lomsebenzisi.I-ODN (i-Optical Distribution Network) yenziwe nge-SM fiber kunye ne-passive splitter (i-Splitter) kunye nenkqubo yokulawula inethiwekhi.
Kweminye imigangatho ye-PON, umgangatho we-GPON unikezela nge-bandwidth ephezulu engazange ibonwe ngaphambili, kunye nesantya esisezantsi ukuya kwi-2.5Gbit / s, kunye neempawu zayo ze-asymmetric ziyakwazi ukulungelelanisa ngakumbi kwimarike yenkonzo yedatha ye-broadband.Inika isiqinisekiso senkonzo epheleleyo yeQoS, kwaye ithwala iiseli ze-ATM kunye (okanye) izakhelo zeGEM ngexesha elinye.Inekhono elihle lokubonelela ngamanqanaba eenkonzo, inkxaso yesiqinisekiso se-QoS kunye nokufikelela kwinkonzo epheleleyo.Xa uphethe izakhelo ze-GEM, iinkonzo ze-TDM zinokumatshwa kwiifreyimu ze-GEM, kunye nezakhelo eziqhelekileyo ze-8kHz (125μs) zinokuxhasa ngokuthe ngqo iinkonzo ze-TDM.Njengomgangatho wobugcisa bezinga lonxibelelwano, i-GPON iphinda ichaze indlela yokukhusela kwaye igqibezele imisebenzi ye-OAM kwinqanaba lokufikelela kwinethiwekhi.
Kwinqanaba le-GPON, iintlobo zeenkonzo ezifuna ukuxhaswa ziquka iinkonzo zedatha (iinkonzo ze-Ethernet, ezibandakanya iinkonzo ze-IP kunye nemijelo yevidiyo ye-MPEG), iinkonzo ze-PSTN (i-POTS, iinkonzo ze-ISDN), imigca enikezelweyo (T1, E1, DS3, E3, kunye neenkonzo ze-ATM).) kunye neenkonzo zevidiyo (ividiyo yedijithali).Iinkonzo ezininzi kwi-GPON zifakwe kwiiseli ze-ATM okanye iifreyimu ze-GEM zokuhanjiswa, ezinokubonelela ngeziqinisekiso ezihambelanayo ze-QoS kwiintlobo zeenkonzo ezahlukeneyo.