Tus qauv ieee802.3av txhais 10g/1g (uplink rate 10g/downlink rate 1g) asymmetric physical layer mode (tom qab no hu ua 10g/1g asymmetric mode) thiab 10g/10g (uplink rate thiab downlink rate yog ob qho tib si 10g) symmetrical ob A physical layer (tom qab no hu ua 10g/10g symmetric mode):
Lub olt hauv 10g/1g tsis yog khub hom tuaj yeem sib xws nrog onu hauv 1g/1g symmetric hom thiab onu hauv 10g/1g asymmetric hom. OLT hauv 10g/10g symmetric hom tuaj yeem sib xws nrog onu hauv 1g/1g hom, onu hauv 10g/1g asymmetric hom, thiab onu hauv 10g/10g symmetric hom.
Lub OLT nyob rau hauv hom symmetric thiab OLT nyob rau hauv hom asymmetric yog tib yam nyob rau hauv qhov kev taw qhia downlink ntawm txoj kev kho qhov muag ntawm lub cev txheej, thiab 10g channel siv 1577nm wavelength thiab 64b / 66b code encoding; yog li tsis muaj teeb meem seb lub onu nyob rau hauv hom symmetric lossis hom asymmetric, nws tuaj yeem Tau txais cov ntaub ntawv downlink los ntawm olt. Lub olt yuav tshaj tawm cov mpcpdsicoverygate (ntau-point tswj protocol, ntau-point tswj protocol) thav duab tsis tu ncua. Lub teb cov ntaub ntawv tshawb pom hauv lub thav duab yog siv tshwj xeeb los ceeb toom rau lub qhov rais uplink muaj peev xwm (1g, 10g, 1g + 10g dual rate), thiab lub onu tuaj yeem tau txais olt los ntawm hom kev ua haujlwm tam sim no ntawm lub thav duab no.
Lub onu hauv hom symmetric thiab hom asymmetric yog sib xws kiag li ntawm mac txheej (media access control, medium access control layer), thiab qhov sib txawv ntawm lawv yog concentrated hauv phy txheej (physical layer, bottom layer ntawm osi), thiab cov kev xa tawm ntawm phy txheej nyob ntawm Ntxig lub optical module ntawm onu:
Thaum ib lub module optical asymmetric raug ntxig rau hauv onu (uas yog, lub onu yog ib lub onu asymmetric), vim tias qhov uplink rate ntawm lub module optical asymmetric yog txog li 1g, lub phy txheej ntawm onu tsuas tuaj yeem teeb tsa qhov kis tau tus nqi ntawm 1g kom ua haujlwm hauv hom asymmetric. Thaum ib lub module optical symmetric raug ntxig rau hauv onu, vim tias qhov uplink rate ntawm lub module optical yog txog li 10g, lub onu tuaj yeem teeb tsa qhov xa ntawm lub phy txheej mus rau 10g kom ua haujlwm hauv hom symmetric, lossis teeb tsa qhov xa ntawm lub phy txheej mus rau 1g kom ua haujlwm hauv hom asymmetric.
Txawm li cas los xij, lub onu thiab olt uas twb muaj lawm yuav muaj cov teeb meem hauv qab no thaum lub network hloov kho dua tshiab:
Thaum lub sijhawm hloov kho network, OLT yuav hloov ntawm hom symmetric thiab hom asymmetric, tab sis ONU tsis tuaj yeem hloov raws li kev hloov pauv ntawm OLT. Piv txwv li, OLT hloov ntawm hom symmetric mus rau hom asymmetric, tab sis ONU tseem nyob hauv hom symmetric. Lub sijhawm no, hom local end (olt) thiab hom remote end (onu) tsis sib xws.Cov ntsiab lus ntawm kev ua tiav:
Lub hom phiaj ntawm cov qhov tsis zoo uas muaj nyob rau hauv cov txuj ci yav dhau los, qhov teeb meem kev daws teeb meem los ntawm kev tsim kho tshiab no yog: yuav ua li cas ua rau lub onu hloov pauv raws li hom kev hloov pauv ntawm olt thaum lub olt ua qhov kev hloov pauv ntawm hom symmetric / hom asymmetric; qhov kev tsim kho tshiab no paub txog kev sib xyaw ua ke zoo meej ntawm olt thiab onu Adaptation, yuav tsis muaj qhov tsis sib xws ntawm hom kawg hauv zos thiab hom kawg chaw taws teeb.
Yuav kom ua tiav lub hom phiaj saum toj no, lub luag haujlwm uas tau muab los ntawm kev tsim kho tshiab no hloov kho rau 10g/10g symmetry thiab 10g/1g asymmetry, suav nrog cov kauj ruam hauv qab no:
Kauj Ruam a: Tau txais hom optical module ntawm onu. Thaum lub optical module yog ib qho symmetrical optical module, txiav txim siab seb hom ua haujlwm tam sim no ntawm onu. Yog tias hom ua haujlwm ntawm onu yog hom symmetrical, mus rau kauj ruam b; yog tias hom ua haujlwm ntawm onu yog hom asymmetrical, mus rau kauj ruam c;
Kauj Ruam b: Txheeb xyuas seb tus lej ntawm cov ntaub ntawv qhov rai uas tau muab los ntawm olt hauv hom asymmetric puas siab dua qhov txwv tsis pub tshaj, yog tias yog, hloov hom kev ua haujlwm ntawm onu los ntawm hom symmetrical mus rau hom asymmetrical, thiab xaus; txwv tsis pub, khaws hom kev ua haujlwm ntawm onu, thiab xaus;
Kauj Ruam c: Txheeb xyuas seb tus lej ntawm cov ntaub ntawv qhov rai uas tau muab los ntawm olt hauv hom symmetric puas siab dua qhov txwv tsis pub tshaj, yog tias yog, hloov hom kev ua haujlwm ntawm onu los ntawm hom asymmetric mus rau hom symmetric, thiab xaus; txwv tsis pub, khaws hom kev ua haujlwm ntawm onu, xaus.
Raws li cov kev daws teeb meem saum toj no, cov txheej txheem ntawm kev tau txais hom optical module ntawm onu piav qhia hauv kauj ruam a yog: thaum lub onu pib, tau txais hom optical module ntawm onu:
Yog tias lub optical module yog ib qho asymmetric optical module, xaus cov txheej txheem thiab xaus;
Yog tias lub optical module yog ib lub optical module symmetrical, thaum lub onu hloov ntawm lub xeev tsis muaj teeb mus rau lub xeev cuam tshuam, rov qab tau hom optical module ntawm onu, yog tias lub optical module yog ib lub optical module symmetrical, txuas ntxiv cov txheej txheem tom ntej ntawm kauj ruam a; yog tias lub optical module yog asymmetrical Optical module, xaus cov txheej txheem thiab xaus.
Lub onu uas muab los ntawm qhov kev tsim kho tshiab no hloov kho rau 10g/10g symmetrical thiab 10g/1g asymmetrical systems, suav nrog lub onu detection module, lub symmetrical mode switching module, thiab lub asymmetrical mode switching module uas teeb tsa rau ntawm onu;
Lub onu nrhiav module siv los: tau txais hom optical module ntawm onu, thaum lub optical module yog symmetrical optical module, txiav txim siab hom ua haujlwm tam sim no ntawm onu, yog tias hom ua haujlwm ntawm onu yog hom symmetrical, xa lub teeb liab hloov hom symmetrical mus rau lub teeb liab hloov hom symmetrical; Yog tias hom ua haujlwm ntawm onu yog hom asymmetric, lub teeb liab hloov hom asymmetric raug xa mus rau lub teeb liab hloov hom asymmetric;
Lub module hloov hom symmetric siv rau: tom qab tau txais lub teeb liab hloov hom symmetric, txiav txim seb tus lej ntawm cov ntaub ntawv qhov rai uas olt muab hauv hom asymmetric mus txog qhov txwv tsis pub dhau, thiab yog tias muaj, hloov hom kev ua haujlwm ntawm onu los ntawm hom symmetric mus rau hom asymmetric; Txwv tsis pub khaws hom kev ua haujlwm ntawm onu;
Lub module hloov hom asymmetric siv rau: tom qab tau txais lub teeb liab hloov hom asymmetric, txiav txim seb tus lej ntawm cov ntaub ntawv qhov rai xa los ntawm olt mus rau hom symmetric puas siab dua qhov txwv tsis pub tshaj, thiab yog tias muaj, hloov hom kev ua haujlwm ntawm onu los ntawm hom asymmetric mus rau hom symmetric; Txwv tsis pub khaws hom kev ua haujlwm onu.
Raws li cov txheej txheem kev tshaj lij saum toj no, cov txheej txheem ntawm kev tau txais hom optical module ntawm onu hauv onu detection module yog: thaum onu pib, tau txais hom optical module ntawm onu:
Yog tias lub optical module yog ib qho asymmetric optical module, tsis txhob ua haujlwm;
Yog tias lub optical module yog ib lub optical module symmetrical, thaum lub onu hloov ntawm lub xeev tsis muaj teeb mus rau lub xeev cuam tshuam, rov qab tau hom optical module ntawm onu, yog tias lub optical module yog ib lub optical module symmetrical, txuas ntxiv cov txheej txheem tom ntej ntawm lub onu detection module; yog tias lub optical module yog ib lub optical module tsis Symmetrical, tsum tsis txhob ua haujlwm.
Piv nrog rau cov txuj ci ua ntej, qhov kev tsim kho tshiab no muaj qhov zoo ntawm:
(1) Hais txog kauj ruam a ntawm qhov kev tsim kho tshiab no, nws tuaj yeem paub tias qhov kev tsim kho tshiab no tau txais hom onu ua ntej; ntawm lub hauv paus no, hais txog kauj ruam b thiab kauj ruam c ntawm qhov kev tsim kho tshiab no, nws tuaj yeem pom tias qhov kev tsim kho tshiab no tuaj yeem ntes tau hom kev ua haujlwm ntawm olt, thiab raws li hom kev ua haujlwm ntawm olt, los hloov kho kom kho hom kev ua haujlwm ntawm onu, yog li kom paub txog kev hloov kho zoo meej ntawm olt thiab onu, thiab yuav tsis muaj qhov tsis sib xws ntawm hom kawg hauv zos thiab hom kawg deb hauv cov kos duab ua ntej.
(2) Hais txog kauj ruam a ntawm qhov kev tsim kho tshiab no, nws tuaj yeem pom tias yog tias qhov kev tsim kho tshiab no txiav txim siab tias hom onu yog asymmetric onu, uas yog, onu tsuas muaj peev xwm ua haujlwm hauv hom asymmetric, thiab onu tsuas yog hloov kho rau 10g / 10g symmetric hom, thiab kev ua raws li tsis tau ua tiav ntawm lub sijhawm no (vim tias onu tsis tuaj yeem hloov hom ua haujlwm), yog li txo cov nqi khiav lag luam thiab txhim kho kev ua haujlwm zoo.
(3) Hais txog kauj ruam a ntawm qhov kev tsim kho tshiab no, nws tuaj yeem pom tias qhov kev tsim kho tshiab no yuav tsum tau ntes hom optical module ntawm onu thaum lub onu pib thiab thaum lub onu hloov ntawm lub xeev tsaus ntuj mus rau lub xeev teeb, thiab 2 qhov kev kuaj pom saum toj no tuaj yeem ntes tau lub xeev pib ntawm onu Hom optical module (kev kuaj pom thaum pib), thiab seb lub optical module puas tau hloov pauv (kev kuaj pom thaum hloov ntawm lub xeev tsis muaj teeb mus rau lub xeev teeb); yog li ntawd, qhov kev tsim kho tshiab no tuaj yeem hloov cov hom kev ua haujlwm tom ntej raws li hom onu's optical module, kom ntseeg tau tias qhov tseeb ntawm kev ua haujlwm.
Lub sijhawm tshaj tawm: Lub Rau Hli-05-2023