Nyob rau hauv ib lub pon network architecture, A ALT thiab ONU ua haujlwm ua ke li cas?

OLT thiab ONU kev sib koom tes hauv Pon Networks: ib qho kev sib sib zog nqus dhia

HauvPassive Optical Network (Pon)architectures) (piv txwv li, gon, epon, xgs-pon), tusKab kho qhov muag kab (OLT)thiabChav tsev kho kho kho kho qhov muag (ONU)ua aMaster-qhev kev sib raug zoo, ua kom muaj kev sib txuas lus ua tau zoo dua li cov khoom siv fiber ntau. Hauv qab no yog cov ncauj lus kom ntxaws ntawm lawv kev sib koom tes.

1. PON Network Incology Txheej txheem cej luam

Tus dej:Aggregates tsheb los ntawm ntau yam ntawm ntau onus, tswj bandwidth, thiab interfaces nrog tus ISP Core network.

Onu:Ua hauj lwm ua cov neeg sau npe-sab EndePoint, hloov kho qhov muag cov cim rau cov khoom siv kawg.

Txhais tawm:Pais dhau kev faib kho qhov muag (tsis muaj tshuab hluav taws xob nquag).

2. Downstream (OLT → ONU) Kev Sib Txuas Lus

(1) Kev tshaj tawm kev tshaj tawm

Cov olt kisCov tsheb khiav txuas mus ntxiv(1490nm hauv Gon, 1577nm hauv xgs-Pon) rau tag nrho cov onus.

Encryption (AES -128 hauv gpon):Ua kom pom tseeb tsuas yog cov ntaub ntawv ntawm cov ntaub ntawv ntawm cov ntaub ntawv hauv Decryptions (txhua ONU muaj qhov tshwj xeebLub pov haum chaw nres nkoj ID).

(2) qauv qauv (gonpon piv txwv)

GTC (GPon Kis kis Convergence) Ncej:

MuajLub pov haum (GPPPPPPPPSulation Cov Qauv) Payloads(segmented rau hauv 125μs thav ntawv).

Kos tauPLOO (lub cev txheej OAM) lusrau OnU kev tswj hwm.

(3) ONU ua

Txhua ONUNtxaij Lim Dejraws nwsAlloc-ID (gpon) / Llid (Epon).

Decrypts thiab cov ntaub ntawv forwards rau cov khoom siv sib txuas (PC, Router, VoIP xov tooj).

3. Mus li (onu → ugt) kev sib txuas lus

(1) Tdma (lub sijhawm-faib ntau qhov kev nkag tau)

Txij li txhua yam ntawm txhua qhov kev faib tawm ib yam ntws los yog wavelength (1310nm hauv gpon, 1270nm hauv epon), oltTeem Sij Hawm Sijhawmkom tsis txhob muaj kev sib tsoo.

Dynamic bandwidth faib (DBA):

OLT PEARS ONUS RAUCov xwm txheej tsis zoo.

Tso caiKev Tshaj Tawm WindowsRaws li qhov tseem ceeb (piv txwv li, VoIP> Internet> IPTV).

(2) tawg-hom kis

Onus yuav tsumsynchronize laser sijhawmkom tsis txhob muaj kev sib tw cov paib.

Cov txheej txheem muaj xws li:

OLT ntsuas txhua ONU'spuag ncig-ncig qeebthiab them rau cov fiber ntau sib txawv.

Paub meej cov sij hawm sib txawv (zov bands tiv thaiv kev cuam tshuam rau kev cuam tshuam)

(3) epon vs. gonping ntws los

4. OLT-ONU Kev Tswj & Kev Tswj Xyuas

(1) ONU Sau Npe & Kev Txheeb Xyuas

Discovery Past:

OLT txheeb xyuas cov khoom tshiab ntawmTus naj npawb (SN) lossis Zov / Password.

Muab ibOnu-id(Gcon) lossisLelid(Epon).

Xws li & Calibration:

OLT ntsuas Fiber ntau thiab teeb tsakev sib luag qeeb.

Pab Pawg:

OLT thawb VLAN, QOS, thiab Firmware ntawmOMCI (GPON) lossis OAM (EPON).

(2) tshuaj xyuas tiag tiag

OLT ua haujlwm:

Cov neeg soj xyuas onu cov xwm txheej (kho qhov muag, kub, nce sijhawm).

Kuaj pom kev ua txhaum (piv txwv li, kev txiav fiber ntau, thau khoom noj).

Onu qhia:

Sends tswb (Los, Lf, tuag Gasp).

5. Kev Sib Tw & Kev Kho Mob

6. Tswv Yim Piv Txwv: GMPON cov ntaub ntawv ntws

Cov neeg siv thov lub vev xaib:

• Onu buffers IT HTTP thov, tos rau nws cov kev ua haujlwm nce toj.

OLT ROLLANTS Kev Xa Khoom Qhov rai:

• Onu xa cov lus thov hauv qhov tawg (1310NM).

OLT forwards rau Internet:

• Cov txheej txheem kev thov, cov ntaub ntawv xa rov qab los ntawm kev tshaj tawm hauv qab (1490NN).

Onu cov ntxaij lim dej & xa cov ntaub ntawv:

• Decryps thiab txoj kev teb rau cov neeg siv khoom siv.

Xaus: OLT-Onu Synergy

• Tus dej:Lub "Hlwb" ntawm pon-tswj lub sijhawm, bandwidth, thiab kev nyab xeeb.
• Onu:Tus "authutor" -Adapts kho qhov muag pib rau cov neeg siv khoom kawg thiab cov khoom tshiab rau cov lus qhia OLT.
• Passive splitter:Ua rau cov nqi sib koom ua ke.