1. Cov Ntaub Ntawv Ntsuas
EPON muab cov chaw ruaj khov thiab qis txuas nrog 1.25 Gbps, siv 8b / 10b kab coding, thiab tus nqi tseeb yog 1Gbps.
GPON txhawb rau ntau qib ceev, tuaj yeem txhawb uplink thiab downlink asymmetric tus nqi, downlink 2.5Gbps lossis 1.25Gbps, uplink 1.25Gbps lossis 622Mbps, raws li qhov xav tau tiag tiag los txiav txim siab uplink thiab downlink nqi, xaiv qhov sib txuam kho qhov muag, thiab nce Tus nqi ua tiav ntawm kev siv kho qhov muag ceev.
2. Shunt ratio
Qhov shunt piv yog qhov chaw nres nkoj OLT nrog tus lej ntawm ONU.
Tus qauv EPON qhia tias yog shunt piv yog 1:32.
GPON cov qauv ntsiab lus shunt piv raws li hauv qab no: 1:32, 1:64; 1: 128.
Qhov tseeb, EPON system kuj tseem tuaj yeem ua tiav ntau dua ntawm qhov sib faib, xws li 1:64, 1: 128, thiab EPON tswj raws tu qauv tuaj yeem txhawb ntau dua ONU.
Lub shunt piv yog tsuas yog txwv los ntawm kev ua tau zoo ntsuas ntawm qhov ntsuas ntawm lub ntsej muag kho qhov muag, thiab qhov loj shunt piv yuav ua rau muaj kev nce nqi ntawm tus nqi kho qhov muag siv kho qhov muag tau siv.
GPON muaj ntau txoj kev xaiv, tab sis tus nqi kom zoo dua tsis pom tseeb.
Qhov siab tshaj plaws ntawm lub cev qhov kev txhawb nqa los ntawm GPON system yog qhov chaw xa hluav taws xob ntau, Thaum kho qhov muag pom kev sib piv yog 1:16, nws yuav tsum txhawb nqa qhov siab tshaj plaws ntawm lub cev nyob deb li 20km. Thaum tus nqi kho qhov muag pom yog 1:32, nws yuav tsum txhawb nqa qhov siab tshaj plaws ntawm lub cev ntev txog 10km.
EPON zoo ib yam, thiab nws yog qhov zoo tib yam.
3. QoS (kev pabcuam zoo）
Ethernet raws tu qauv tsis ua raws li QoS lub peev xwm, yog li ntawd, txhawm rau ua kom EPON pabcuam cov neeg siv, lub tswvyim ntawm virtual thaj chaw hauv cheeb tsam (VLAN) tau npaj tseg. Tus VLAN tawm tswv yim tias cov kablus tau txais tuaj yeem hloov kho. Qhov muaj feem thib kos kev teeb tsa lub hauv paus rau QOS, tab sis VLAN tau tiav txuj, yog li tus nqi siab kawg. Thiab GPON nws tus kheej muaj cov QoS kev pabcuam zoo.
GPON nws muaj nws tus kheej zoo QoS cov kev pabcuam muaj peev xwm.
4. PON thiab GPON txuas txheej sib piv
Piv nrog GPON, EPON yog qhov yooj yim dua thiab ncaj qha dua. Hauv kev ntshiab Ethernet kis, ob txoj kev ntim khoom thiab ATM kev them nyiaj yug ntawm GPON yuav tsis ua si lub luag haujlwm tseem ceeb.
Txawm li cas los xij, hauv kev nkag mus rau cov kev pabcuam network, EPON tsuas yog tsim nyog rau cov kev pabcuam sib kis cov ntaub ntawv, thaum GPON tuaj yeem muab peb cov kev pabcuam.EPON yog ib hom kev daws teeb meem Ethernet, ua raws li cov yam ntxwv ntawm Ethernet protoco thiab kev ua haujlwm, thiab GPON siv synchronous optical network (SONET, synchronous optical network) / synchronous digital hierarchy (SDH, synchronous digital hierarchy) thev naus laus zis thiab cov ntawv cog lus dav dav rau Ethernet xa.
Ob EPON thiab GPON muaj lawv tus kheej zoo, GPON zoo dua li EPON hais txog kev ntsuas, tab sis EPON muaj qhov zoo ntawm lub sijhawm thiab nqi, GPON tau txais, nrhiav lub neej yav tom ntej, txoj kev nkag mus rau broadband yuav tsis hloov los ntawm leej twg, nws yuav tsum tau sib xyaw ua ke.
Rau cov bandwidth thiab ntau qhov chaw ua lag luam, QoS, kev ruaj ntseg yuav tsum thiab ATM tshuab raws li cov neeg siv ntawm cov pob txha caj qaum, GPON yuav zoo dua.
Hais txog cov nqi tsis raug, QoS thiab kev ruaj ntseg yuav tsum tsis yog cov neeg siv khoom siab, EPON ua tus thawj.
