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 ezifana ne-bandwidth ephezulu, ukusebenza kakuhle okuphezulu, ukugubungela okukhulu, ujongano lomsebenzisi otyebileyo, njl. njl. Uninzi lwabaqhubi luyijonga njengeteknoloji efanelekileyo yokuphumeza i-broadband kunye nenguqu edibeneyo yokufikelela kwiinkonzo zenethiwekhi.
I-GPON yaqala ukuphakanyiswa ngumbutho we-FSAN ngoSeptemba 2002. Ngokusekelwe kule nto, i-ITU-T igqibe uphuhliso lwe-ITU-T G.984.1 kunye ne-G.984.2 ngo-Matshi 2003, kwaye yagqiba i-G. ngoFebruwari nangoJuni 2004. Ukumiswa komgangatho we-984.3 .Ngaloo ndlela, usapho oluqhelekileyo lwe-GPON luyenziwa ekugqibeleni.
Isakhiwo esisisiseko sesixhobo esisekelwe kwi-teknoloji ye-GPON ifana ne-PON ekhoyo.Kwakhona i-OLT (i-terminal ye-optical line) ye-ofisi ephakathi, i-ONT / ONU yesiphelo somsebenzisi (i-terminal ye-optical network okanye i-optical network unit), kunye nezixhobo ezimbini zokuqala zidibaniswe yimodi enye.I-fiber optical (SM fiber) kunye ne-splitter passive (Splitter) yenziwe nge-ODN (i-Optical Distribution Network) kunye nenkqubo yokulawula inethiwekhi.
Kweminye imigangatho ye-PON, umgangatho we-GPON unikezela nge-bandwidth ephezulu engazange ibonwe ngaphambili kunye nesantya sokuhla ukuya kwi-2.5 Gbit / s, kunye neempawu zayo ze-asymmetric zifaneleke ngakumbi kwimarike yenkonzo yedatha ye-broadband.Inika isiqinisekiso senkonzo epheleleyo ye-QoS, kwaye ithwala iiseli ze-ATM. kunye/okanye izakhelo zeGEM.Inenqanaba lenkonzo elungileyo, isiqinisekiso seQoS kunye nokufikelela ngokupheleleyo kwenkonzo.Xa uphethe izakhelo ze-GEM, iinkonzo ze-TDM zinokuzotywa kwizakhelo ze-GEM, kunye nezakhelo ezisemgangathweni ze-8 kHz (125 μs) zinokuxhasa ngokuthe ngqo iinkonzo ze-TDM.Njengomgangatho wobuchwephesha we-carrier-class, i-GPON iphinda ichaze iindlela zokukhusela kunye nemisebenzi epheleleyo ye-OAM kwinqanaba lokufikelela kwinethiwekhi.
Kwinqanaba le-GPON, iintlobo zeenkonzo ezifuna ukuxhaswa zichazwe ngokucacileyo: iinkonzo zedatha (iinkonzo ze-Ethernet, ezibandakanya iinkonzo ze-IP kunye nemijelo yevidiyo ye-MPEG), iinkonzo ze-PSTN (ii-POTS, iinkonzo ze-ISDN), kunye nemigca ezinikeleyo (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, ukubonelela ngeziqinisekiso ezihambelanayo ze-QoS kwiintlobo zeenkonzo ezahlukeneyo.