EPON na GPON nwere uru nke ha. Site na ndeksi arụmọrụ, GPON dị elu karịa EPON, mana EPON nwere uru nke oge na ọnụ ahịa. GPON na-aga n'ihu. Na-atụ anya n'ọdịnihu brọdband ohere ahịa, o nwere ike ọ gaghị abụ onye na-anọchi onye, ọ kwesịrị ịdị na-ebikọ ọnụ na nkwado. Maka bandwit, ọtụtụ ọrụ, QoS dị elu na nchekwa chọrọ, yana ndị ahịa nwere teknụzụ ATM dị ka netwọk azụ azụ, GPON ga-adaba adaba. Maka ndị nwere ọnụ ahịa, QoS, na ndị ahịa nchekwa dị ala, EPON abụrụla onye na-achị.
Kedu ihe bụ PON?
Nkà na ụzụ ịnweta brọdband na-arị elu, nke a kara aka na ọ ga-abụ ebe agha ebe anwụrụ ọkụ na-agaghị apụ apụ. Ka ọ dị ugbu a, ihe eji arụ ọrụ ụlọ ka bụ teknụzụ ADSL, mana ọtụtụ ndị na-emepụta akụrụngwa na ndị na-arụ ọrụ etinyela uche ha na teknụzụ ịnweta netwọkụ anya.
Ọnụ ahịa ọla kọpa na-aga n'ihu na-arị elu, ọnụ ahịa eriri anya na-aga n'ihu na-adaba, na mmụba na-arịwanye elu nke bandwidth sitere na IPTV na ọrụ egwuregwu vidiyo na-akpali mmepe nke FTTH. Atụmanya na-egbuke egbuke iji dochie ọla kọpa na eriri coaxial wired na eriri anya, ekwentị, USB TV, na data brọdband na-apụtawanye ìhè.
PON (Passive Optical Network) netwọk anya na-agafe agafe bụ teknụzụ bụ isi iji nweta eriri FTTH n'ụlọ, na-enye ohere ịnweta fiber-na-multipoint. Dị ka e gosiri na Figure 1, ọ mejupụtaraOLT(optical akara ọnụ) n'akụkụ ụlọ ọrụ na akụkụ onye ọrụ mejupụtaraONU(Optical Network Unit) na ODN (Optical Distribution Network). N'ozuzu, mgbada na-eji mgbasa ozi TDM na elu na-eji TDMA (Time Division Multiple Access) iji mepụta topology osisi na-atụ-na-multipoint. PON, dị ka ebe kachasị na-egbuke egbuke nke teknụzụ ịnweta anya, bụ "na-agafe agafe". ODN enweghị ngwaọrụ eletrọnịkị ọ bụla na-arụ ọrụ yana ọkụ eletrik. Ihe mejupụtara ha niile bụ ngwaọrụ na-agafe agafe dịka ndị nkesa anya (Splitter). Ụgwọ njikwa, mmezi na ọrụ dị ala.
Njirimara teknụzụ nke EPON na GPON
EPON na-achọ ka ọ dabara na teknụzụ Ethernet dị ugbu a. Ọ bụ n'ihu nke 802.3 protocol na netwọk ohere anya. Ọ na-eketa uru nke ọnụ ahịa Ethernet dị ala, ụkpụrụ na-agbanwe agbanwe, yana teknụzụ tozuru oke. Ọ nwere nnukwu ahịa na ezigbo ndakọrịta. A na-edobe GPON na ụlọ ọrụ mgbasa ozi maka mkpa nke ọtụtụ ọrụ, ịnweta ọrụ zuru oke na nkwa QoS, ma na-agbalịsi ike ịchọta ngwọta kachasị mma nke na-akwado ọrụ niile ma nwee arụmọrụ kachasị elu, na-atụ aro "mepee ma zuru ezu nyochaghachi nkwekọrịta niile n'ihu ọha. ".
Njirimara teknụzụ nke EPON bụ ndị a:
1) Ethernet bụ ihe kacha mma maka ibu ọrụ IP;
2) Nlekọta dị mfe, dị mfe ịgbasa, dị mfe ịkwalite;
3) Ngwa EPON tozuru oke ma dị. EPON etinyela ọtụtụ nde ahịrị n'Eshia. Ewepụtala ibe azụmahịa nke ọgbọ nke atọ. Ọnụ ego nke modul ngwa anya na ibe ndị yiri ya agbadala nke ukwuu, na-erute ọnụ ọgụgụ nke iji azụmahịa, nke nwere ike izute ihe achọrọ azụmahịa brọdband na nso nso a;
4) Usoro EPON dị mfe na ọnụ ahịa mmejuputa ya dị ala, na ọnụ ahịa akụrụngwa dị ala. Teknụzụ kacha dabara adaba chọrọ na netwọk ohere metro, ọ bụghị teknụzụ kacha mma;
5) Kwesịrị ekwesị maka ụlọ, netwọk mpaghara obodo na-enweghị ATM ma ọ bụ BPON ibu arọ;
6) Kwesịrị ekwesị maka ọdịnihu, IP na-ebu ọrụ niile, na Ethernet na-eburu ọrụ IP.
Njirimara teknụzụ nke GPON bụ ndị a:
1) Nweta netwọk maka ọrụ telecom;
2) bandwit dị elu: ọnụego ahịrị, mgbada 2.488Gb / s, elu 1.244Gb / s; 3) Ịrụ ọrụ mgbasa ozi dị elu: omume dị ala 94% (bandwidt ziri ezi ruo 2.4G) omume elu 93% (bandband n'ezie ruo 1.1G);
3) Nkwado ọrụ zuru oke: Ụkpụrụ G.984.X na-akọwapụta nkwado nke ọkwa ọrụ zuru oke (olu, data na vidiyo);
4) Ike njikwa siri ike: yana ọrụ bara ụba, echekwara ngalaba OAM zuru oke na nhazi etiti, na ụkpụrụ OMCI ka edobere;
5) Ogo ọrụ dị elu: ọtụtụ ọkwa QoS nwere ike kwe nkwa bandwit na igbu oge nke azụmahịa;
6) Ọnụ ala zuru oke: Ogologo nnyefe ogologo na oke nkewa dị elu, nke na-ekesa nke ọmaOLTna-akwụ ụgwọ ma na-ebelata ụgwọ ịnweta onye ọrụ.
Kedu nke ka mma, EPON vs GPON?
1. Ụkpụrụ ndị EPON na GPON nakweere dị iche. Enwere ike ịsị na GPON dị elu ma nwee ike ịnyefe bandwidth karịa, ma nwee ike iweta ọtụtụ ndị ọrụ karịa EPON. GPON sitere na mmalite teknụzụ APON \ BPON nke nkwukọrịta fiber optic, nke sitere na nke a mepụtara. A na-eji usoro etiti ATM na-ebufe iyi koodu. E nke EPON na-ezo aka na Ethernet jikọrọ ọnụ, ya mere, na mmalite nke ọmụmụ EPON, a chọrọ ka ọ nwee ike jikọọ na Ịntanetị ozugbo na enweghị nsogbu, ya mere koodu iyi nke EPON bụ usoro nhazi nke Ethernet. N'ezie, iji mee mgbanwe na nnyefe na eriri anya, a na-ekpuchi usoro nhazi nke EPON kọwara n'èzí nke usoro Ethernet frame.
2. Ụkpụrụ EPON bụ IEEE 802.3ah. Ụkpụrụ bụ isi nke IEEE iji mepụta ọkọlọtọ EPON bụ ịhazi EPON n'ime ihe owuwu 802.3 dị ka o kwere mee, ma gbasaa usoro MAC nke ọkọlọtọ Ethernet ruo opekempe.
3. Ụkpụrụ GPON bụ usoro ụkpụrụ ITU-TG.984. Nhazi nke ọkọlọtọ GPON na-eburu n'uche nkwado maka ọrụ TDM ọdịnala wee na-aga n'ihu na-eji nhazi etiti 125ms a kapịrị ọnụ iji nọgide na-aga n'ihu oge 8K. Iji kwadoo ọtụtụ protocols dị ka ATM, GPON na-akọwapụta usoro mkpuchi mkpuchi ọhụrụ GEM: GPONEncapsulaTionMethod. Enwere ike ịgwakọta data nke ATM na protocol ndị ọzọ ma tinye ya n'ime okpokolo agba.
4. N'ihe gbasara ngwa ngwa, GPON nwere nnukwu bandwidth karịa EPON, onye na-enye ya ọrụ na-arụ ọrụ nke ọma, na ike nkewa anya ya dị ike karị. Ọ nwere ike ịnyefe ọrụ bandwidth buru ibu, ghọtakwuo ohere onye ọrụ, tinyekwuo anya na ọtụtụ ọrụ na nkwa QoS, mana nwetakwu ihe ọ gbagwojuru anya, nke na-eme ka ọnụ ahịa ya dị elu karịa nke EPON, mana na ntinye nnukwu ibu. nke teknụzụ GPON, ọnụ ahịa dị iche n'etiti GPON na EPON na-eji nwayọọ nwayọọ na-ebelata.