Nyob rau hauv ib lub sij hawm digital division multiplexing kev sib txuas lus system, txhawm rau txhawm rau cais cov cim lub sijhawm, qhov kawg xa yuav tsum muab cov cim pib ntawm txhua lub thav duab, thiab cov txheej txheem ntawm kev ntes thiab tau txais cov cim no ntawm qhov kawg tau txais yog hu ua thav duab synchronization.Muaj ob hom thav duab synchronization: pib-nres synchronization txoj kev thiab ntxig tshwj xeeb synchronization code pawg txheej txheem.
Start-stop synchronization txoj kev:Cov pab pawg code nws tus kheej muaj nws tus kheej pab pawg cov ntaub ntawv los ntawm kev siv cov txheej txheem tshwj xeeb encoding txoj cai ntawm kev xa ntawv kawg.
Inserting tshwj xeeb synchronization code pab pawg txheej txheem:Nws hais txog kev ntxig ntau cov lej synchronization rau thav duab synchronization hauv cov cim kis kab ke.
Feem ntau muaj ob hom centralized insertion thiab interval insertion.Centralized insertion, tseem hu ua coherent insertion, xav kom cov ncej synchronization tshwj xeeb thaiv muaj cov yam ntxwv zoo autocorrelation.Ib qho kev siv feem ntau sib koom ua ke pawg code yog Barker code.Interval insertion.Kuj tseem hu ua kev faib tawm, ib qho yooj yim lub sij hawm cyclic sequence feem ntau yog siv raws li tus ncej synchronization code, thiab yog uniformly tso rau hauv cov ntaub ntawv code kwj.
Yog vim li cas vim li cas cov ntaub ntawv txuas txheej muab cov khoom sib txuas rau hauv cov thav ntawv thiab xa lawv yog tias thaum muaj kev ua yuam kev tshwm sim, tsuas yog cov thav duab uas tsis raug tuaj yeem xa rov qab, thiab nws tsis tas yuav rov xa tag nrho cov ntaub ntawv, yog li txhim kho kev ua haujlwm.Checksums feem ntau yog xam rau txhua tus ncej.Thaum ib lub thav duab tuaj txog ntawm qhov chaw, lub checksum raug xam dua, thiab yog tias nws txawv ntawm qhov checksum thawj, qhov yuam kev tuaj yeem kuaj pom.
Cov saum toj no yog cov lus piav qhia ntawm "OSI-Data Link Layer-Frame Synchronization Function" coj los ntawm Shenzhen HDV photoelectric Technology Co., Ltd. Cov khoom sib txuas lus tsim los ntawm lub tuam txhab npog:
Module qeb: optical fiber modules, Ethernet modules, optical fiber ntau transceiver modules, optical fiber nkag modules, SSFP optical modules, thiabSFP optical fibers, lwm.
ONU qeb: EPON UA, AC ONU, Optical fiber ntau ONU, CATV UA, GPON UA, XOV TOOJ, lwm.
OLT chav kawm: OLT hloov, GPON OLT, PEB OLT, kev sib txuas lus OLT, thiab lwm yam.
Cov khoom lag luam saum toj no tuaj yeem muab kev txhawb nqa rau cov xwm txheej sib txawv.Pab neeg ua haujlwm R & D muaj zog thiab muaj zog tuaj yeem pab cov neeg siv khoom nrog cov teeb meem kev lag luam, thiab pab pawg ua lag luam muaj kev xav thiab kev ua haujlwm tuaj yeem pab cov neeg siv khoom tau txais kev pabcuam zoo thaum lub sijhawm sib tham ua ntej thiab ua haujlwm tom qab tsim khoom.Zoo siab txais tos koj tiv tauj peb rau txhua yam kev nug.
