GPON yog dab tsi?
GPON (Gigabit-Capable PON) thev naus laus zis yog lub cim tshiab ntawm broadband passive optical integrated access standard raws li ITU-TG.984.x tus qauv.Nws muaj ntau yam zoo xws li high bandwidth, high efficiency, loj kev pab them nqi, nplua nuj neeg siv interface, thiab lwm yam. Feem ntau cov neeg ua hauj lwm suav hais tias nws yog ib tug zoo tagnrho technology rau kev ua tau zoo broadband thiab kev sib koom ua ke ntawm kev nkag mus rau network kev pab cuam.
GPON tau xub thov los ntawm lub koom haum FSAN thaum lub Cuaj Hlis 2002. Raws li qhov no, ITU-T ua tiav kev txhim kho ntawm ITU-T G.984.1 thiab G.984.2 hauv lub Peb Hlis 2003, thiab ua tiav G. thaum Lub Ob Hlis thiab Lub Rau Hli 2004. Standardization ntawm 984.3 .Yog li, tus qauv tsev neeg ntawm GPON yog thaum kawg tsim.
Cov qauv yooj yim ntawm cov cuab yeej raws li GPON thev naus laus zis zoo ib yam li PON uas twb muaj lawm.Nws tseem yog OLT (optical kab davhlau ya nyob twg) ntawm lub hauv paus chaw ua hauj lwm, ONT / ONU ntawm tus neeg siv kawg (lub optical network davhlau ya nyob twg los yog kho qhov muag network unit), thiab thawj ob pab kiag li lawm yog kev cob cog rua los ntawm ib hom.Cov fiber ntau optical (SM fiber) thiab passive splitter (Splitter) yog tsim los ntawm ODN (Optical Distribution Network) thiab kev tswj xyuas network.
Rau lwm cov qauv PON, GPON tus qauv muab qhov tsis tau muaj dua qhov siab bandwidth nrog tus nqi downlink txog li 2.5 Gbit / s, thiab nws cov yam ntxwv asymmetric zoo dua rau kev lag luam broadband cov ntaub ntawv kev pabcuam. thiab/los yog GEM ntas.Nws muaj kev pabcuam zoo, QoS lav thiab kev pabcuam tag nrho.Thaum nqa GEM thav duab, TDM cov kev pabcuam tuaj yeem ua rau hauv GEM thav duab, thiab tus qauv 8 kHz (125 μs) thav duab tuaj yeem txhawb nqa TDM cov kev pabcuam ncaj qha.Raws li tus qauv kev coj ua-chav kawm, GPON tseem qhia txog cov txheej txheem tiv thaiv thiab ua tiav OAM ua haujlwm ntawm qib nkag mus rau hauv lub network.
Hauv GPON tus qauv, hom kev pabcuam uas yuav tsum tau txais kev txhawb nqa tau hais meej meej: cov kev pabcuam cov ntaub ntawv (cov kev pabcuam Ethernet, suav nrog cov kev pabcuam IP thiab MPEG video kwj), PSTN cov kev pabcuam (POTS, ISDN cov kev pabcuam), thiab cov kab siab (T1, E1, DS3, E3, thiab ATM cov kev pabcuam).) thiab cov kev pabcuam video (digital video).Ntau qhov kev pabcuam hauv GPON tau teeb tsa rau ATM hlwb lossis GEM thav duab rau kev sib kis, muab QoS lav zoo rau ntau hom kev pabcuam.