Raws li ob tus tswv cuab tseem ceeb ntawm kev siv kho qhov muag network, EPON thiab GPON txhua tus muaj lawv tus kheej qhov zoo, sib tw nrog ib leeg, sib ntxiv, thiab kawm ntawm ib leeg. Cov hauv qab no yuav muab piv rau lawv hauv ntau yam.
Tus nqi
EPON muab kev ruaj ntseg uplink thiab downlink 1.25 Gbps, txais 8b / 10b kab coding, thiab tus nqi tiag tiag yog 1Gbps.
GPON txhawb ntau theem, uas tuaj yeem txhawb asymmetric uplink thiab downlink tus nqi, 2.5Gbps lossis 1.25Gbps rau downlink, thiab 1.25Gbps lossis 622Mbps rau uplink. Tus nqi uplink thiab downlink tau txiav txim siab raws li qhov xav tau tiag tiag, thiab cov khoom siv kho qhov muag raug xaiv los ua kom tus nqi-tus nqi piv ntawm cov khoom siv kho qhov muag.
Split ratio
Qhov sib cais yog pes tsawgONUs(neeg siv terminals) yog nqa los ntawm ib tugOLTchaw nres nkoj (central office).
Tus qauv EPON txhais tau tias qhov sib faib ntawm 1:32.
Tus qauv GPON txhais cov piv txwv hauv qab no: 1:32; 1:64; 1:128.
Qhov tseeb, kev siv tshuab EPON tuaj yeem ua tiav qhov sib faib ntau dua, xws li 1: 64, 1: 128, thiab EPON tswj raws tu qauv tuaj yeem txhawb nqa ntau dua.ONUs. Qhov sib cais feem ntau tsuas yog txwv los ntawm qhov ntsuas qhov ua tau zoo ntawm qhov kho qhov muag module, thiab qhov sib faib loj yuav ua rau tus nqi ntawm cov khoom siv kho qhov muag tau nce ntau.
GPON muab ntau txoj kev xaiv, tab sis tus nqi kom zoo dua tsis pom tseeb. Qhov siab tshaj plaws kis tau tus mob Qhov siab tshaj plaws lub cev nyob deb uas GPON system tuaj yeem txhawb nqa. Thaum lub optical splitting ratio yog 1:16, nws yuav tsum txhawb nqa lub cev qhov siab tshaj plaws ntawm 20km; Thaum lub optical splitting ratio yog 1:32, nws yuav tsum txhawb nqa lub cev siab tshaj plaws ntawm 10km. EPON yog tib yam li qhov no, tab sis nws yog sib npaug nyob rau hauv dav dav.
Service zoo
Ethernet raws tu qauv nws tus kheej tsis muaj peev xwm los lis QoS. Yog li ntawd, txhawm rau pab EPON los pab cov neeg siv, lub tswv yim ntawm virtual cheeb tsam hauv cheeb tsam network tau npaj. VLAN tawm tswv yim tias qhov kev txheeb xyuas qhov tseem ceeb ntawm cov thav ntawv tau txais tuaj yeem hloov kho los tsim lub hauv paus rau QOS, tab sis vim tias VLAN raug siv los ntawm tus kheej, uas yog kim heev. Thiab GPON muaj nws tus kheej QoS kev pabcuam zoo heev.
EPON thiab GPON txuas txheej sib piv
Piv nrog GPON, EPON yog yooj yim dua thiab ncaj qha. Hauv kev xa tawm Ethernet ntshiab, ob txoj hauv kev encapsulation thiab ATM kev txhawb nqa ntawm GPON yuav tsis ua lub luag haujlwm loj.
Txawm li cas los xij, hauv kev siv cov kev pabcuam hauv network, EPON tsuas yog tsim nyog rau kev pabcuam xa cov ntaub ntawv, thaum GPON tuaj yeem muab kev pabcuam peb-hauv-ib.
EPON yog ib qho kev daws teeb meem tag nrho-Ethernet uas ua tiav raws li cov yam ntxwv, kev ua tau zoo thiab kev ua haujlwm ntawm Ethernet raws tu qauv, thaum GPON siv synchronous optical network / synchronous digital system technology thiab cov txheej txheem dav dav rau Ethernet kis tau tus mob.
EPON thiab GPON muaj lawv tus kheej qhov zoo thiab qhov tsis zoo. Nyob rau hauv cov nqe lus ntawm kev ua tau zoo, GPON yog superior rau EPON, tab sis EPON muaj qhov zoo ntawm lub sij hawm thiab nqi. GPON tab tom ntes. Nrhiav rau pem hauv ntej mus rau yav tom ntej broadband nkag lag luam, tej zaum yuav tsis yog leej twg hloov lwm tus, tab sis coexists thiab complements ib leeg.Rau cov neeg muas zaub nrog high bandwidth, multi-service, QoS thiab kev ruaj ntseg yuav tsum tau, thiab ATM technology raws li lub caj qaum network, GPON yuav. tsim nyog dua. Rau cov pab pawg neeg siv khoom kim heev nrog QoS qis thiab kev ruaj ntseg, EPON tau dhau los ua qhov tseem ceeb.