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 nkà na ụzụ nnweta anya nke emepụtara iji kwado ngwa ngwa-na-multipoint.PON mejupụtara Optical Line Terminal (OLT), Optical Network Unit (ONU) na Optical Distribution Network (ODN) .Ya. Akụkụ dị mkpa bụ na ODN bụ ihe mejupụtara ngwaọrụ ndị na-agafe agafe, a na-agbasakwa mgbaàmà ahụ site na otu eriri ngwa anya nkekọrịtara nye onye ọ bụla ọrụ site na splitter. A na-akpọ usoro a Passive Optical Network n'ihi na ọ dị iche na njikọ ọdịnala dị n'etiti etiti etiti. ụlọ ọrụ na ndị ahịa, na isi iyi electronic ngwaọrụ dị n'etiti a ohere netwọk.Na mgbakwunye na uru nke ịzọpụta eriri akụrụngwa, PON nwere ike ukwuu mfe ọrụ na mmezi nke netwọk usoro, nke 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 mpaghara ọdụ ọdụ ụgbọ elu Optical Line (OLT), akụkụ Optical Network Unit (ONU) na Optical Distribution Network (ODN).
2.1 OLT
Ọtụtụ mgbe, a na-etinye OLT n'ime ụlọ igwe etiti.Ọ na-enye ihe ngọpụ ngwa anya fiber maka ngọpụ maka netwọọdụ ngwa anya na-aga n'ihu na ụzọ mgbada ala, GE, 10baes-t, 100base-t, 10gbase-x na oghere ndị ọzọ na ụzọ elu, na OLT na-akwado interface EI iji ghọta ohere olu TDM.
2.2 ONU/ONT
A na-etinye ONU/ONT na njedebe onye ọrụ, tumadi na-eji usoro Ethernet iji ghọta mbufe data onye ọrụ.Enwere ike ibugharị data n'etiti OLT na ONU.
2.3 ODN
Dị ka alaka eriri na-agafe agafe, ODN na-ejikọta ngwa ngwa nke OLT na ONU.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. A na-ekenye bandwit statically na ọnụ ọgụgụ kasị elu, usoro bandwidth usoro dum ga-agwụ n'ime obere oge. W ọnụ ọgụgụ nke bandwit adịghị elu, n'aka nke ọzọ, ike bandwidth ikenye ga-eme ka bandwit itinye n'ọrụ nke usoro.Na mberede ọrụ chọrọ nke ONU. Enwere ike ime ya site na DBA.Ndozi bandwidth na-agbanwe agbanwe n'etiti ONU nwere ike imeziwanye arụmọrụ nke bandwidth upline PON. N'ihi mmụba nke arụmọrụ bandwidth ojiji, enwere ike ịgbakwunye ndị ọrụ W na PON dị adị, yana ọnụ ahịa ọnụọgụ bandwidth nke ndị ọrụ W nwere ike iru nwere ike iji tụnyere ma ọ bụ ọbụna gafere bandwit nke omenala edo usoro oke.
Centralized njikwa bụ ụzọ nke ike ike bandwit òkè. Nke a ụzọ bụ maka niile ONU uplink ozi, na-etinyere na OLT maka bandwit, mgbe ahụ, OLT dị ka arịrịọ nke ONU ikike dị ka mkpa algọridim maka brọdband gụpụtara W.The isi echiche nke oke njirisi algọridim bụ na onye ọ bụla ONU lee uplink nwere ike na-ekewa oge nkesa nke cell mbata na-arịọ bandwit. Dị ka arịrịọ nke onye ọ bụla ONU, OLT allocates bandwit ziri ezi na ezi uche, na aka nhazi bufee, ozi njehie koodu, cell. mfu, 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.The ONU chọrọ mmekọrịta na ndị ọzọ random ohere ụzọ na-enweghị a. ụfọdụ ohere oge. Ya mere, ọnụ ọgụgụ 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 ONU ekenye, na size nke. A na-eji data nyere site na ọnụọgụ ọnụọgụgụ multiplexing iji gbanwee nha nke oghere oge.
3.3 Teknụzụ nkwụghachi ụgwọ nke OLT na igbu oge yana teknụzụ nkwụnye na egwuregwu ONU
N'ihi na ọwa elu nke EPON na-eji TDMA eme ihe, ịnweta multi-point na-eme ka oge data etiti nke ONU dị iche iche, ya mere a na-ewebata nkà na ụzụ nkwụghachi ụgwọ na-egbu oge iji gbochie nkukota nke data na oge ngalaba. Iji zere nkukota nke oge. Ekwesịrị iji teknụzụ nkwụghachi ụgwọ ogologo oge na ogologo oge iji mekọrịta ọdịiche oge netwọkụ niile. N'ụzọ dị otú a, ngwugwu na-abịarute na oghere oge akọwapụtara dị ka DBA algọridim na nkwado nkwụnye ma kpọọ maka ONU. ONU ka OLT n'ụzọ ziri ezi na ịhazigharị nnyefe nnyefe nke ONU kpọmkwem nwere ike ibelata oge n'etiti eziga Windows nke ONU, melite itinye n'ọrụ nke uplink ọwa ma belata oge igbu oge. A na-amalite usoro EPON ma mechaa n'otu oge ahụ OLT gafere, na-akara akara n'otu oge ahụ achọpụtara plọg na egwu nke ONU.
3.4Izipu na ịnata akara mgbawa
Ebe ọ bụ na OLT natara mgbama mgbawa nke ONU ọ bụla, OLT kwesịrị ịghọta mmekọrịta oge maka oge wee nweta data. ihe a chọrọ, na ọnụ ọgụgụ dị nta nke ngwaọrụ ngwa anya nke gbawara agbawa nwere ọsọ na-arụ ọrụ nke ihe dịka 155M, nke dị oke ọnụ ahịa. Ya mere, iji ghọta ọnọdụ mgbawa nke ọma, a na-eji usoro pụrụ iche eme ihe maka njedebe nnata.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 mgbawa, ọkwa nnabata (ọnụ ụzọ) kwesịrị imezigharị oge ọ bụla a na-enweta akara ngosi ọhụrụ.
4.Application nke eriri optic nkwurịta okwu na cell
Enwere ike ịtọ ONU n'akụkụ ndị ahịa (FTTH) ma ọ bụ na corridor (FTTB), mana 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 mgba ọkụ corridor.
Mmechi
Teknụzụ EPON nwere ọtụtụ uru, dị ka mkpuchi sara mbara nke ndị ọrụ, oke ọsọ nke elu na mgbada, njirimara nnyefe ngwa anya nke ọma, ịchekwa akụ fiber site na isi ruo na netwọkụ ọtụtụ 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.