1.PON Nhanganyaya

(1)Chii chinonzi PON

PON (passive optical network) tekinoroji (kusanganisira EPON, GPON) ndiyo huru yekumisikidza tekinoroji yekuvandudza FTTx (fiber kusvika kumba). Inogona kuchengetedza backbone fiber zviwanikwa uye mazinga etiweki, uye inogona kupa maviri-nzira yakakwira bandwidth kugona pasi pemamiriro ekutakura kureba. Kune akapfuma marudzi emasevhisi ekuwana, uye kugona kwayo kure manejimendi uye passive optical yekugovera network chimiro inogona kuderedza zvakanyanya kushanda nekugadzirisa mutengo, uye inogona kutsigira akawanda maficha ekushandisa.

(2) PON tekinoroji kuvandudza

Kubva pakubuda kwePON, yanga ichikura kwemakore akawanda, ichigadzira nhevedzano yemafungiro, mataurirwo uye kutevedzana kwechigadzirwa seAPON, BPON, EPON, uye GPON.

APON (ATMPON)

ATM is a cell-based transmission protocol. 155Mb / s PON system technical specifications, ITU-TG.983 series standards;

BPON (BroadbandPON)

Iyo APON yakajairwa yakazosimbiswa kuti itsigire mwero wekutapurirana we622Mb/s, uku uchiwedzera mabasa akadai seyakasimba bandwidth kugoverwa nekudzivirira.

EPON (Ethernet PON)

GPON (GigabitPON)

(3) Optical fiber kuwana tekinoroji

2.EPON sumo

(1) Chii chinonzi EPON?

EPON (Ethernet Passive Optical Network) imhando yepoint-to-multipoint network chimiro, passive optical fiber transmission nzira, yakavakirwa pakakwirira-kumhanya Ethernet papuratifomu uye TDM (nguva division multiplexing) nguva kupatsanura MAC midhiya yekuwana nzira yekudzora, inopa akawanda An. yakasanganiswa sevhisi Broadband kuwana tekinoroji.

Iyo EPON sisitimu inoshandisa WDM tekinoroji kuona imwe-fiber bidirectional kutapurirana.

(2) Musimboti weEPON

Kuti uparadzanise zviratidzo zvinopinda uye zvinobuda zvevazhinji vashandisi vaviri pafiber imwechete, nzira mbiri dzinotevera dzekuwedzera dzinoshandiswa.

a. Iyo yakadzika data rwizi inoshandisa tekinoroji yekutepfenyura.

b. Iyo yekumusoro data rwizi inotora tekinoroji yeTDMA.

(3)Nheyo yeEPON-yakadzika

a. Govera yakasarudzika LLID mushure meiyoONUinonyoreswa zvinobudirira.

b. Wedzera LLID isati yatanga packet yega yega kutsiva mabhaiti maviri ekupedzisira eEthernet preamble.

c. Enzanisa iyo LLID yekunyoresa runyorwa kana iyoOLTinogamuchira data. Apo iyoONUinogamuchira data, inongogashira mafuremu kana kutepfenyura mafuremu anofanana neyayo LLID.

(4) Musimboti weEPON-Uplink

a. Enzanisa iyo LLID yekunyoresa runyorwa pamberi peOLTinogamuchira data.

b. Mumwe nomumweONUinotumira furemu yedata munguva yakagoverwa zvakafanana nemidziyo yehofisi.

c. Iyo yakagoverwa nguva slot inotsiva nhambwe pakati peONUsuye inodzivirira kudhumhana pakati peONUs.

(5) Kushanda maitiro eEPON system

OLTkushanda

a. Gadzira timestamp mameseji ehurongwa hwereferensi nguva.

b. Govera bandwidth kuburikidza neMPCP mafuremu. 3. Ita mabasa akasiyana.

c. KudzoraONUkunyoresa.

ONUkushanda

a. TheONUinopindirana neOLTkuburikidza nechitambi chenguva cheiyo downstream control frame.

b. ONUinomirira kuwanikwa furemu.

c. ONUinoita kuwanikwa kwekugadzirisa, kusanganisira: kubva, kutsanangura ID yemuviri uye bandwidth.

d. ONUinomirira mvumo,ONUinogona chete kutumira data panguva yakatenderwa.

(6) Dhizaini yeEPON network manejimendi system

Iyo EPON network manejimendi system yakakamurwa kuita mana mamodule zvinoenderana netiweki manejimendi mabasa: configuration manejimendi, performance management, kukanganisa manejimendi uye kuchengetedza manejimendi.

(7) Kuzadzikiswa kweEPON network manejimendi system

a. Kuzadzikiswa kweEPON network manejimendi system inosanganisira kuzadzikiswa kwemanejimendi chiteshi network manejimendi software uye kuitika kweagent station software.

b. Iyo manejimendi chiteshi network manejimendi system inhengo yekutonga inopa vashandisi ine hushamwari inopindirana interface uye inoshandisa iyo SNMP protocol kubata maitiro eagent.

c. Kuzadzikiswa kweSNMP muchiteshi cheajenti kunonyanya kusanganisira kuitika kweagent process software uye dhizaini uye kurongeka kweMIB.

3. GPON sumo

(1) Chii chinonzi GPON?

GPON (Gigabit-InokwanisaPON Gigabit Passive Optical Network) tekinoroji ndiyo ichangoburwa chizvarwa Broadband passive optical integrated access standard yakavakirwa paITU-TG.984.x (International Telecommunication Union TG.984.x) mwero, ine bandwidth yakakwirira, Kunyatsoshanda, kuvharika kwakakura, hupfumi hwevashandisi nezvimwe zvakawanda. mabhenefiti anoonekwa nevazhinji vanoshanda seyakanakisa tekinoroji yekuona Broadband uye yakazara shanduko yekuwana network masevhisi.

(2）GPON musimboti

GPON yakadzika-yekutepfenyura kutapurirana

GPONS upstream-TDMA mode

Iyo network topology ye passive optical fiber transmission mode inonyanya kuumbwaOLT(Optical line terminal), ODN (optical distribution network), uyeONU(Optical network unit).

ODN inopa optical kutapurirana nzira dzeOLTuyeONU. Iyo ine passive optical splitter uye passive optical musanganiswa. Icho chigadziriso chinoshandiswa chinobatanidzaOLTuyeONU.

(3) GPON musimboti-kumusoro

a. Kufambiswa kwedata rekumusoro kunodzorwa zvakafanana neiyoOLT.

b. TheONUinotumira data yemushandisi zvinoenderana nenguva yakagoverwa neOLTkudzivirira kusawirirana kwekutumira data kunokonzerwa neONU.

c. TheONUinoisa data yeuplink munguva yayo slot zvichienderana nenguva yekugovera furemu, ichiziva kugovana kweuplink chiteshi bandwidth pakati peakawanda.ONUs.

(4) GPON networking mode

GPON inonyanya kutora nzira nhatu dzekubatanidza: FTTH/O, FTTB+LAN uye FTTB+DSL.

a. FTTH/O ifayibha kuenda kumba/hofisi. Mushure mekunge iyo optical fiber inopinda mu splitter, yakabatana zvakananga kumushandisiONU. AnONUinongoshandiswa nemushandisi mumwe chete, ine bandwidth yakakwirira uye inodhura, uye inowanzotarirwa kune vashandisi vepamusoro uye vashandisi vekutengesa.

b. FTTB + LAN inoshandisa faibha kusvika kuchivakwa, yobva yabatanidza masevhisi akasiyana kune vakawanda vashandisi kuburikidza nehukuru-hukuru.ONU(inonzi MDU). Naizvozvo, vashandisi vazhinji vanogovana bandwidth zviwanikwa zveimweONU, uye munhu wega wega ane bandwidth yakaderera uye mutengo wakaderera. , Kazhinji kune yakaderera-yekupedzisira yekugara uye yakaderera-yekupedzisira vashandisi vekutengesa.

c. FTTB+ADSL inoshandisa faibha kusvika pachivakwa, uye yobva yashandisa ADSL kubatanidza masevhisi kune vakawanda vashandisi, uye vashandisi vazhinji vanogovanaONU. Iyo bandwidth, mutengo uye base yevatengi zvakafanana neaya eFTTB + LAN.

4. GPON uye EPON teknolojia yekuenzanisa

Tichitarisa hunhu hwakasiyana hweGPON neEPON tekinoroji, ongororo inotevera inogona kuitwa kune maviri aya matekinoroji.

(1) GPON inotsigira akasiyana siyana mazinga, uye inogona kutsigira asymmetric kumusoro nekudzika kwemareti. GPON ine rusununguko rwakakura mukusarudzwa kwezvinhu zvemaziso, nokudaro kuderedza mari.

(2）EPON inongotsigira mazinga eODN eKirasi A neB chete, ukuwo GPON ichikwanisa kutsigira Kirasi A, B neC, saka GPON inokwanisa kutsigira kusvika 128 split reshiyo uye kusvika 20km kutapurirana chinhambwe.

(3） Enzanisa chete kubva kuprotocol, nekuti chiyero cheEPON chakavakirwa pane 802.3 system chimiro, saka kana ichienzaniswa neyeGPON standard, yayo protocol layering iri nyore uye kuita kwehurongwa kuri nyore.

(4） ITU yakatevera pfungwa dzakawanda dzeAPON chiyero cheG.983 mukugadzirisa chiyero cheGPON, chinokwana kudarika EPON chakagadzirwa neEFM. Kupihwa kweiyo inoshanda kwazvo TC layer meshini ichava chinhu chakakosha cheITU mukugadzira GPON zviyero.

(5） Chiyero cheGPON chinotara kuti TC sublayer inogona kutora nzira mbiri dzekuisa, ATM neGFP. Iyo GFP encapsulation nzira inokodzera kutakura IP/PPP uye mamwe mapaketi-akavakirwa akakwira-level protocol.