Njengoko amalungu amabini aphambili okufikelela kwinethiwekhi ye-optical network, i-EPON kunye ne-GPON nganye ineemfanelo zayo, zikhuphisana, ziyancedisana, kwaye zifunde omnye komnye. Oku kulandelayo kuya kuzithelekisa kwiinkalo ezahlukahlukeneyo.
Ixabiso
I-EPON inikezela nge-uplink esisigxina kunye ne-downlink ye-1.25 Gbps, ithatha i-8b / 10b yekhowudi yomgca, kwaye izinga langempela yi-1Gbps.
I-GPON isekela amanqanaba ahlukeneyo emilinganiselo, enokuxhasa i-asymmetric uplink kunye ne-downlink rates, i-2.5Gbps okanye i-1.25Gbps ye-downlink, kunye ne-1.25Gbps okanye i-622Mbps ye-uplink. Imilinganiselo ye-uplink kunye ne-downlink inqunywe ngokweemfuno zangempela, kwaye iimodyuli ze-optical ezihambelanayo zikhethwa ukunyusa umlinganiselo wexabiso lexabiso lezixhobo zokukhanya.
Ukwahlula umlinganiselo
Umlinganiselo wokwahlula ukuba bangaphiIi-ONU(iitheminali zomsebenzisi) zithwalwa yi-OLTizibuko (iofisi ephakathi).
Umgangatho weEPON uchaza umlinganiselo wokwahlulwa kwe-1:32.
Umgangatho weGPON uchaza umlinganiselo olandelayo wokwahlula: 1:32; 1:64; 1:128.
Ngapha koko, iinkqubo zobugcisa ze-EPON zinokufikelela kwireyishini ephezulu yokwahlula, efana ne-1:64, 1:128, kunye ne-EPON yokulawula iprotocol inokuxhasa ngakumbi.Ii-ONU. Umlinganiselo wokwahlula ubukhulu becala ulinganiselwe kwisalathisi sokusebenza kwemodyuli ye-optical, kwaye umlinganiselo omkhulu wokwahlukana uya kubangela ukuba iindleko zemodyuli ye-optical inyuke kakhulu.
I-GPON ibonelela ngeendlela ezininzi, kodwa inzuzo yeendleko ayibonakali. Ubuninzi bomgama wothumelo Owona mgama mkhulu womzimba onokuxhaswa yi-GPON inkqubo. Xa i-optical splitting ratio yi-1:16, kufuneka ixhase umgama ophezulu womzimba we-20km; xa umlinganiselo wokwahlula optical yi-1:32, kufuneka ixhase umgama omde womzimba we-10km. I-EPON iyafana nale, kodwa iyalingana ngokubanzi.
Sumgangatho wenkonzo
Iprotocol ye-Ethernet ngokwayo ayinakho ukukwazi ukuphatha iQoS. Ke ngoko, ukuze i-EPON ikwazi ukunceda abasebenzisi, ingqikelelo yenethiwekhi yendawo yendawo iyacetywa. I-VLAN iphakamisa ukuba ukuchongwa okuphambili kwezakhelo ezifunyenweyo kunokuguqulwa ukuze kubekwe isiseko se-QOS, kodwa ngenxa yokuba i-VLAN iphunyezwa ngesandla, ebiza kakhulu. Kwaye iGPON ineenkonzo zayo ezibalaseleyo zeQoS.
I-EPON kunye ne-GPON yekhonkco yokuthelekisa umaleko
Xa kuthelekiswa neGPON, i-EPON ilula kwaye ithe ngqo. Kwi-transmission ecocekileyo ye-Ethernet, iindlela ezimbini ze-encapsulation kunye nenkxaso ye-ATM ye-GPON ayiyi kudlala indima enkulu.
Nangona kunjalo, kwiinkonzo zenethiwekhi zokufikelela, i-EPON ifanelekile kuphela kwiinkonzo zokuhanjiswa kwedatha, ngelixa i-GPON inokubonelela ngeenkonzo ezintathu-nye.
I-EPON yisisombululo esipheleleyo se-Ethernet esihambelana ngokupheleleyo neempawu, ukusebenza kunye nokusebenza kwe-Ethernet protocol, ngelixa i-GPON isebenzisa inethiwekhi ye-synchronous optical / iteknoloji ye-synchronous yenkqubo yedijithali kunye ne-protocol yokuqulunqa ngokubanzi yokuhanjiswa kwe-Ethernet.
I-EPON kunye ne-GPON zineengenelo kunye nezingeloncedo zazo. Ngokwezikhombisi zokusebenza, i-GPON iphezulu kune-EPON, kodwa i-EPON ineenzuzo ngexesha kunye neendleko. I-GPON iyabamba. Ukukhangela phambili kwimarike yokufikelela kwi-broadband yexesha elizayo, kungenakuba ngubani othatha indawo yabanye, kodwa uhlala kunye kwaye uyancedisana.Kubathengi abane-bandwidth ephezulu, iinkonzo ezininzi, i-QoS kunye neemfuno zokhuseleko, kunye nobuchwepheshe be-ATM njengenethiwekhi yomqolo, i-GPON iya kuba ifaneleke ngakumbi. Kumaqela abathengi angabizi kakhulu nge-QoS ephantsi kunye neemfuno zokhuseleko, i-EPON iye yaba yeyona ibalaseleyo.