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 tus qauv ITU-TG.984.x.Nws muaj ntau yam zoo xws li high bandwidth, high efficiency, loj kev pab cuam, thiab nplua nuj neeg siv interfaces.Cov neeg ua haujlwm feem ntau suav tias nws yog ib qho cuab yeej zoo tshaj plaws kom paub txog broadband thiab kev hloov pauv ntawm kev siv cov kev pabcuam hauv network.
GPON tau xub thov los ntawm lub koom haum FSAN thaum lub Cuaj Hlis 2002. Raws li qhov no, ITU-T ua tiav cov qauv ntawm ITU-T G.984.1 thiab G.984.2 hauv lub Peb Hlis 2003, thiab ua tiav G.984.1 thiab G.984.2 thaum Lub Ob Hlis thiab Lub Rau Hli. 2004. 984.3 standardization.Yog li thaum kawg tsim cov qauv tsev neeg ntawm GPON.
Cov qauv ntawm cov khoom siv raws li GPON thev naus laus zis zoo ib yam li PON uas twb muaj lawm.Nws tseem yog tsim los ntawm OLT (optical kab davhlau ya nyob twg) ntawm lub hauv paus chaw ua haujlwm thiab ONT / ONU (optical network davhlau ya nyob twg lossis hu ua optical network unit) ntawm tus neeg siv sab.ODN (Optical Distribution Network) yog tsim los ntawm SM fiber ntau thiab passive splitter (Splitter) thiab lub network tswj system.
Rau lwm cov qauv PON, GPON tus qauv muab qhov tsis tau muaj dua qhov siab bandwidth, nrog tus nqi qis txog li 2.5Gbit / s, thiab nws cov yam ntxwv asymmetric tuaj yeem hloov kho tau zoo dua rau kev lag luam broadband cov ntaub ntawv.Nws muab kev pabcuam tag nrho ntawm QoS, thiab nqa lub tshuab ATM thiab (lossis) GEM thav duab tib lub sijhawm.Nws muaj lub peev xwm zoo los muab cov kev pabcuam qib siab, txhawb QoS lav thiab kev pabcuam tag nrho.Thaum nqa GEM thav duab, TDM cov kev pabcuam tuaj yeem ua rau GEM thav duab, thiab tus qauv 8kHz (125μs) thav duab tuaj yeem txhawb nqa TDM cov kev pabcuam ncaj qha.Raws li kev sib txuas lus-theem tus qauv, GPON tseem qhia txog kev tiv thaiv kev tiv thaiv thiab ua tiav OAM ua haujlwm ntawm qib nkag nkag.
Hauv GPON tus qauv, hom kev pabcuam uas yuav tsum tau txhawb nqa suav nrog cov kev pabcuam cov ntaub ntawv (Ethernet cov kev pabcuam, suav nrog cov kev pabcuam IP thiab MPEG video kwj), PSTN cov kev pabcuam (POTS, ISDN cov kev pabcuam), cov kab siab (T1, E1, DS3, E3, thiab kev pabcuam ATM).) Thiab cov kev pabcuam video (cov yees duab digital).Ntau qhov kev pabcuam hauv GPON tau teeb tsa rau ATM hlwb lossis GEM thav duab rau kev sib kis, uas tuaj yeem muab QoS lav zoo rau ntau hom kev pabcuam.