Kev kuaj xyuas yuam kev (parity check code): parity check code muaj n-1 ntsis ntaub ntawv chav tsev thiab 1 ntsis kos lub caij. N-1 ntsis ntaub ntawv chav tsev yog cov ntaub ntawv siv tau nyob rau hauv cov ntaub ntawv peb xa, thiab 1-ntsis check unit yog siv rau kev ua yuam kev thiab redundancy code.
Khib check:Yog hais tias tus naj npawb ntawm 1 nyob rau hauv no series yog txawm, ntxiv 1 nyob rau hauv pem hauv ntej ntawm nws, thiab tus naj npawb ntawm 1 yuav khib, txwv tsis pub ntxiv 0;
Txawm check:Yog hais tias tus naj npawb ntawm 1 nyob rau hauv no series yog khib, ntxiv 1 nyob rau hauv pem hauv ntej ntawm nws, thiab tus naj npawb ntawm 1 yuav txawm, txwv tsis pub ntxiv 0;
Piv txwv li: (1) 1111 odd check yog 11111 txawm check yog 01111
(2) 1110 odd check yog 01110 txawm check yog 11110
Tus yam ntxwv ntawm parity check code yog tias nws tsuas tuaj yeem txheeb xyuas qhov yuam kev me ntsis, thiab qhov muaj peev xwm tshawb pom qhov yuam kev yog 50%, uas tsis tuaj yeem kho.
Kev txheeb xyuas qhov yuam kev (CRC cyclic redundancy check code): nws yog ib txoj hauv kev faib ntau yam los xyuas qhov yuam kev. Txhua txoj hlua me ntsis raug suav tias yog polynomial, thiab kev ua haujlwm modulo-2 tau txais yuav.
Cov txheej txheem suav ntawm kev xa tawm kawg yog: cov ntaub ntawv xa mus + cov ntawv txheeb xyuas ntawm r cov khoom, tau txais cov ntaub ntawv xa mus, thiab tom qab ntawd ua cov kev faib modulo-2 nrog cov khoom tsim los ntawm polynomial coj cov seem, uas yog FCS ncej kos ib ntus ntxiv.
Cov txheej txheem suav ntawm qhov kawg tau txais yog: thaum qhov kawg tau txais lub thav duab, nws ua haujlwm modulo-2 faib nrog cov generated polynomial, thiab tom qab ntawd xyuas cov seem. Yog tias qhov seem yog 0, nws txhais tau hais tias cov txheej txheem sib kis yog qhov qub, thiab tom qab ntawd lees txais cov ntaub ntawv. Yog tias nws tsis yog 0, nws txhais tau hais tias cov txheej txheem sib kis tau txawv txav, thiab muab cov ntaub ntawv pov tseg.
Cov saum toj no yog cov kev paub piav qhia ntawm "yuam kev tshawb nrhiav code" 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, thiab SFP optical fibers, lwm.
ONUqeb: EPON UA, AC ONU, Optical fiber ntau ONU, CATV UA, GPON UA, XOV TOOJ, lwm.
OLTchav kawm: OLT hloov, GPON OLT, PEB OLT, kev sib txuas lusOLT, lwm.
Cov khoom lag luam module saum toj no tuaj yeem muab kev txhawb nqa rau cov xwm txheej sib txawv. Ib pab neeg 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.
