Khodi yozindikira zolakwika (kodi yoyang'ana): cheke chapawiri chimakhala ndi n-1 bit information unit ndi 1 bit check element.N-1 bit information unit ndi data yovomerezeka muzambiri zomwe timatumiza, ndipo 1-bit cheke unit imagwiritsidwa ntchito pozindikira zolakwika ndi khodi ya redundancy.
Kuwona mwachilendo:ngati chiwerengero cha 1 mndandandawu ndi wofanana, onjezani 1 patsogolo pake, ndipo chiwerengero cha 1 chimakhala chosamvetseka, mwinamwake onjezerani 0;
Ngakhale cheke:ngati chiwerengero cha 1 mndandandawu ndi wosamvetseka, onjezani 1 kutsogolo kwake, ndipo chiwerengero cha 1 chimakhala chofanana, mwinamwake onjezerani 0;
Mwachitsanzo: (1) 1111 cheke osamvetseka ndi 11111 ngakhale cheke ndi 01111
(2) 1110 cheke osamvetseka ndi 01110 ngakhale cheke ndi 11110
Chikhalidwe cha cheke choyang'ana parity ndikuti chimatha kuzindikira zolakwika zosamvetseka, ndipo kuthekera kozindikira zolakwika ndi 50%, zomwe sizingawongoleredwe.
Khodi yozindikira zolakwika (CRC cyclic redundancy check code): ndi njira yogawanitsa ya polynomial kuti muwone zolakwika.Chingwe chilichonse chimatengedwa ngati polynomial, ndipo ntchito ya modulo-2 imatengedwa.
Njira yowerengera yomaliza yotumizira ndi: mawonekedwe a data omwe atumizidwe + macheke a r bits, pezani mawonekedwe a data kuti atumizidwe, ndiyeno mugawane modulo-2 ndi polynomial yopangidwa kuti mutenge zotsalira, zomwe ndi FCS chimango cheke ndondomeko kuwonjezeredwa.
Mawerengedwe a mapeto olandira ndi: pamene mapeto olandira alandira chimango, amachita magawano a modulo-2 ndi polynomial yopangidwa, ndiyeno amayang'ana zotsalira.Ngati yotsalira ndi 0, zikutanthauza kuti njira yopatsirana ndi yachibadwa, ndiyeno imavomereza deta.Ngati si 0, zikutanthauza kuti njira yopatsirana ndi yachilendo, ndiyeno imataya deta.
Zomwe zili pamwambazi ndizofotokozera chidziwitso cha "code yozindikira zolakwika" yobweretsedwa ndi Shenzhen HDV photoelectric Technology Co., Ltd.Zolankhulana zomwe zimapangidwa ndi kampani zimakwirira;
Magawo a module: Optical fiber modules, Ethernet modules, Optical fiber transceiver modules, optical fiber access modules, SSFP Optical modules, ndi SFP kuwala ulusi, ndi zina.
Gulu la ONU: EPON ONU, AC ONU, Optical fiber ONU, CATV ONU, GPON ONU, XPON PA, ndi zina.
kalasi ya OLT: Kusintha kwa mtengo wa OLT, Mtengo wa GPON OLT, EPON OLT, kulumikizana OLT, etc.
Zomwe zili pamwambazi zitha kuthandizira pazochitika zosiyanasiyana zapaintaneti.Gulu la akatswiri komanso lamphamvu la R&D litha kuthandiza makasitomala omwe ali ndi zovuta zaukadaulo, ndipo gulu loganiza bwino komanso laukadaulo litha kuthandiza makasitomala kupeza ntchito zapamwamba panthawi yokambirana zisanachitike komanso pambuyo popanga.Takulandirani ku Lumikizanani nafe pafunso lamtundu uliwonse.
