Dị ka ụzọ nkwurịta okwu dị irè nke a na-ejikarị eme ihe. Ndị ọrụ na-eji EPON jikọọ na netwọk ohere. N'akwụkwọ a, a na-akọwa teknụzụ isi nke EPON nkenke, na ntinye nke EPON na nkwurịta okwu anya na-ewebata n'ụzọ zuru ezu, a na-enyocha ụkpụrụ nkà na ụzụ ya.
1.Nkeimmalitenke EPON
PON bụ nkwekọrịta nke Passive Optical Network, nke bụ teknụzụ nnweta anya emepụtara iji kwado ngwa-na-multipoint ngwa.PON mejupụtara Optical Line Terminal (OLT), Ngalaba netwọkụ anya (ONU) na Optical Distribution Network (ODN) .Njirimara ya dị mkpa bụ na ODN niile mejupụtara ngwaọrụ ndị na-agafe agafe, a na-ekesakwa mgbaàmà ahụ site na otu Fiber Optical Fiber na onye ọ bụla na-arụ ọrụ site na splitter. A na-akpọ usoro a Passive Optical Network n'ihi na ọ dị iche na njikọ ọdịnala n'etiti ụlọ ọrụ etiti na onye ahịa, na isi iyi ngwaọrụ eletrọnịkị dị n'etiti netwọọdụ ohere a. Na mgbakwunye na uru nke ịchekwa akụrụngwa fiber, PON nwere ike ime ka ọrụ na mmezi nke sistemụ netwọkụ dị mfe, nke bụ. dị nnọọ irè na mbenata ewu na ọrụ ụgwọ. Ọzọkwa, Ọdịdị nke dị ọcha ngwa anya media na transperent ngwa anya eriri brọdband netwọk hụ na oru nche nke ga-eme n'ọdịnihu azụmahịa mgbasa.
Teknụzụ EPON na-ejikọta teknụzụ Ethernet na nkà na ụzụ PON iji ghọta isi-na-multipoint elu-speed Ethernet fiber access in a simple way.The point-to-multipoint topology bụ usoro nhazi nke EPON kwadoro, ebe a na-eji usoro mgbasa ozi eme ihe maka downlink. na TDMA mode na-eji maka upline, nke nwere ike na-aghọta ụzọ abụọ data nnyefe.
2.Composition nke EPON
Dị ka teknụzụ ịnweta eriri ruo-na-multipoint, Passive Optical Network (PON) nwere ọdụ ọdụ ngwa anya mpaghara (PON).OLT), ngalaba ọrụ n'akụkụ Optical Network Unit (ONU) na Optical Distribution Network (ODN).
2.1OLT
Ọtụtụ mgbe,OLTetinyere n'ime ụlọ igwe etiti. Ọ na-enye ihe ngọpụ eriri anya maka netwọọdụ anya na-agafe agafe na ụzọ mgbada ala, GE, 10baes-t, 100base-t, 10gbase-x na oghere ndị ọzọ na ụzọ elu, naOLTna-akwado interface EI iji ghọta ohere olu TDM.
2.2ONU/ONT
ONU/ ONT na-etinye na njedebe onye ọrụ, tumadi iji Ethernet protocol iji ghọta transperent nyefe nke onye ọrụ data. Enwere ike ibuga data n'etitiOLTnaONU.
2.3 ODN
Dị ka a passive eriri alaka ụlọ ọrụ, ODN jikọọ passive akụrụngwa nkeOLTnaONU. Ọrụ bụ isi nke ODN bụ ikesa data downlink na centralize uplink data.N'ihi na ọ bụ ọrụ na-agafe agafe, ntinye ihe nkesa na-agafe agafe dị nnọọ mfe ma dị mma maka ọtụtụ gburugburu ebe obibi. N'echiche nkịtị, POS ọ bụla nwere ọnụego nkewa nke 8, 16, 32. ma ọ bụ 64, ma nwee ike jikọọ ya n'ọtụtụ ọkwa.
3.Immaliteof key tteknụzụof EPON
3.1Dbasfor dynamicbna obosaraaebe
Real-time (ms / us magnitude) na-agbanwe usoro bandwit uplinking nke ọ bụla OUN na EPON, nke a maara dị ka dynamic bandwit oke algorithm.Na EPON, ọ bụrụ na bandwit na-ekenye statically, mgbe ahụ, nnyefe ọnụego ọrụ maka data nkwurịta okwu bụ nnọọ adabaghị. bandwidth na-ekenye statically na ọnụ ọgụgụ kasị elu ọsọ, dum usoro bandwit ga-agwụ agwụ na a obere oge.W ọnụego nke bandwit adịghị elu, n'aka nke ọzọ, ike bandwit òkè ga-mma bandwit itinye n'ọrụ nke system.Na mberede ọrụ chọrọ nkeONUEnwere ike ime ya site na DBA. Ndozi bandwidth dị ike n'etitiONUN'ihi mmụba nke arụmọrụ bandwidth n'ọrụ, enwere ike ịgbakwunye ndị ọrụ W na PON dị ugbu a, yana ọnụ ahịa ọnụọgụ bandwidth nke ndị ọrụ W nwere ike iru nwere ike iji tụnyere ma ọ bụ karịa karịa bandwidth nke usoro oke oke edo edo.
Centralized akara bụ ụzọ ike ike bandwit òkè. Nke a ụzọ bụ maka ndị niileONUa na-etinye ozi uplinkOLTmaka bandwit, mgbe ahụOLTdị ka arịrịọ nkeONUikike dị ka ihe kwesịrị ekwesị algọridim maka brọdband gụpụtara maka W.Echiche bụ isi nke oke njirisi algọridim bụ na onye ọ bụla ONU lee uplink nwere ike ekewa oge nkesa cell mbata na ịrịọ bandwit.Dịka arịrịọ nke onye ọ bụla.ONU, OLTna-ekenye bandwit n'ụzọ ziri ezi na ezi uche, na-ejikwa nhazi oke, koodu njehie ozi, ọnwụ cell, wdg.
3.2Jigharịa teknụzụ nke ọwa uplink
Ugbu a, isi mmejuputa iwu bụ nkewa oge multiple access multiplexing (TDMA), nke a pụrụ iji n'otu oge oghere oge nkewa multiplexing, statistical time division multiple access multiplexing, random access and so on. Otú ọ dị, M - oge - oge oghere. – nkewa multiplexing nwere ụfọdụ adịghị ike. Dị ka ihe atụ, mgbe ụfọdụ n'ime oge ohere na-adịghị eji, ọ ogide a ụfọdụ bandwit, nke mere na elu gbawara ọnụego ọrụ adaptability adịghị ike zuru ezu.ONUmkpa mmekọrịta na ndị ọzọ random ohere ụzọ na-enweghị a ụfọdụ ohere time.Ya mere, statistical oge nkewa multiple access multiplexing na-ejikarị eme ihe mgbe atụnyere ụkọ nke abụọ. Mgbe uplink mgbaàmà na-ebute site ná, na Ethernet etiti ezigara na oge oghere nke. nkeONUa na-ekenye ya, na nha data nyere site na multixing statistical na-eji gbanwee nha nke oghere oge.
3.3 Teknụzụ nkwụghachi ụgwọ oge nke OLT naONUteknụzụ nkwụnye na egwuregwu
N'ihi na ọwa elu nke EPON na-eji TDMA, ịnweta ọtụtụ ihe na-eme ka oge data etiti na-egbu oge nke ọ bụlaONUdị iche iche, ya mere a na-ewebata nkà na ụzụ nkwụghachi ụgwọ dị iche iche na-egbu oge iji gbochie nkukota nke data na ngalaba oge. Iji zere nkukota nke data ngalaba oge, nha anya na oge ịkwụ ụgwọ oge teknụzụ kwesịrị iji mekọrịta oge netwọk oge niile. N'ụzọ dị otú a, ngwugwu na-abịarute n'otu oge akọwapụtara dị ka algọridim DBA si dị ma kwado nkwụnye na egwu makaONU.Na-atụle anya site na nke ọ bụlaONUto OLTn'ụzọ ziri ezi na ịhazigharị oge nnyefe nkeONUkpomkwem nwere ike ibelata etiti oge n'etiti izipu Windows nkeONU, melite itinye n'ọrụ nke ọwa uplink ma belata igbu oge. A na-ebute usoro EPON ma wuchaa n'otu oge ahụ.OLTna-agafe, na-akara n'otu oge na nkwụnye na egwu nkeONUachọpụtara.
3.4Izipu na ịnata akara mgbawa
Ebe ọ bụ na mgbama mgbawa nke ọ bụlaONUna-enweta site naOLT, OLTkwesịrị ịghọta mmekọrịta oge nke oge wee nata data. Nke a chọrọ iji ngwa anya nwere ike ịkwado mgbawa mgbawa n'ime.ONUnaOLTỌtụtụ ngwa anya ngwaọrụ enweghị ike izute nke a chọrọ, na ọnụ ọgụgụ dị nta nke gbawara mode ngwa anya ngwaọrụ nwere a na-arụ ọrụ ọsọ nke banyere 155M, nke dịtụ elu na price. Ya mere, iji na-aghọta gbawara mode n'ụzọ dị irè karị, a na-eji usoro pụrụ iche eme ihe maka njedebe na-anata. The ngwa anya gbawara nnyefe sekit kwesịrị inwe ike imechi na-emeghe nnọọ ngwa ngwa na guzosie ike n'ókè ngwa ngwa.Ya mere, omenala electro-optical ntụgharị modul iji akpaka ike akara na nzaghachi bụ agaghịkwa adabara iji, ma na-achọ lasers na ngwa ngwa response.The. Ịnata njedebe na-enweta ike ọkụ mgbaàmà nke onye ọrụ ọ bụla dị iche na ọbụna karịa mgbanwe. Ya mere, na sekit mgbawa na-anata, ọkwa nnabata (ọnụ ụzọ) kwesịrị imezigharị oge ọ bụla enwetara mgbaama ọhụrụ.
4.Application nke eriri optic nkwurịta okwu na cell
NkeONUenwere ike ịtọ ya n'akụkụ ndị ahịa (FTTH) ma ọ bụ na corridor (FTTB), ma nke a bụ n'ihe banyere ịnweta sel. Na ọnọdụ FTTH, ọnụ ọgụgụ ndị ọrụ ejighị n'aka. N'okwu a, iji mee ka ọnụ ọgụgụ ndị na-arụ ọrụ nke ngwa ọrụ dịkwuo mma, belata ụgwọ ọrụ ma mee ka nhazi ahụ dị mfe. Ntọala nke nkesa anya na-etinye uche na ya, na iji ọkwa nkesa ọkụ, nhazi nke ebe ọtụtụ ihe na kọmputa. ime ụlọ nke obodo ma ọ bụ obodo n'ime igbe inyefe ọkụ. Mgbe arụchara ya n'ụzọ dị otú ahụ, n'agbanyeghị ọnụ ọgụgụ nke ndị ọrụ na-abawanye ma ọ bụ na-ebelata, iji ngwá ọrụ nwere ike ịbawanye elu. Otú ọ dị, mgbe ọnụ ọgụgụ nke ndị ọrụ buru ibu, mkpa maka ịnweta eriri anya ga-abawanye ụba. Mgbe na ọnọdụ FTTB, a na-edozi OMU na corridor, na-esetịpụ ihe nkedo anya n'otu ụzọ ahụ dị ka FTTH. A na-emekarị ụdị nnweta a na paspọtụịgbanwee.
Mmechi
Teknụzụ EPON nwere ọtụtụ uru, dị ka mkpuchi sara mbara nke ndị ọrụ, oke ọsọ nke elu na mgbada, njirimara nnyefe ngwa anya na-arụ ọrụ nke ọma, na-echekwa akụrụngwa fiber site na isi ruo na ịkparịta ụka n'ọtụtụ ebe na ihe ndị ọzọ. -level ọrụ ẹkedọhọde teknuzu architecture, ma nwekwara passive, ọ dịghị electromagnetic radieshon ike ịzọpụta na gburugburu ebe obibi nchebe e ji mara. Dị ka ngwa anya nkwurịta okwu technology, EPON technology bụ nke ukwuu significance.Ka otu nke mainstream teknụzụ n'ọdịnihu, EPON technology nwere àgwà. nke ike na-agbanwe agbanwe na gburugburu ebe a na-ebunye ya, ntụkwasị obi dị elu na enweghị nrụzi, na-aghọ nhọrọ kachasị mma maka iwu nke netwọk mgbasa ozi na-esote ọgbọ.