Ka helu kuhi hewa (parity check code): parity check code he n-1 bit information unit and 1 bit check element. ʻO ka ʻāpana ʻike bit N-1 ka ʻikepili kūpono i ka ʻike a mākou e hoʻouna ai, a ua hoʻohana ʻia ka ʻāpana nānā 1-bit no ka ʻike hewa a me ke code redundancy.
Nānā ʻē aʻe:ina like ka huina 1 o keia moo, e hookui i 1 ma ke alo, a lilo ka huina o 1 i odd, a i ole ia, e hoonui i 0;
E nānā pono:ina he okoa ka huina 1 o keia moo, e hookui i 1 ma ke alo, a lilo ka huina o 1 i kau like, a i ole ia e hui i 0;
No ka laʻana: (1) ʻo 1111 ka helu ʻokoʻa ʻo 11111 ka helu helu 01111.
(2) ʻO 1110 ka helu ʻokoʻa ʻo 01110 ʻoiai ʻo ka helu 11110
ʻO ka hiʻohiʻona o ka parity check code ʻo ia ka hiki ke ʻike i nā hewa bit odd, a ʻo ka hiki ke ʻike hewa he 50%, ʻaʻole hiki ke hoʻoponopono ʻia.
Code ʻike hewa (CRC cyclic redundancy check code): he ʻano mahele polynomial e ʻike i nā hewa. Manaʻo ʻia kēlā me kēia string bit he polynomial, a ua ʻae ʻia ka hana modulo-2.
ʻO ke kaʻina hana helu o ka hopena hoʻouna: ʻo ke kiʻi ʻikepili e hoʻouna ʻia + ke kaʻina nānā o nā r bits, e kiʻi i ke kiʻi ʻikepili e hoʻouna ʻia, a laila hana i ka mahele modulo-2 me ka polynomial i hana ʻia e lawe i ke koena, ʻo ia ka E hoʻohui ʻia ke kaʻina nānā kiʻi kiʻi FCS.
ʻO ke kaʻina helu o ka hopena loaʻa: ke loaʻa i ka hopena loaʻa ke kiʻi, hana ia i ka mahele modulo-2 me ka polynomial i hana ʻia, a laila nānā i ke koena. Inā he 0 ke koena, ʻo ia ka mea maʻamau ke kaʻina hana hoʻouna, a laila ʻae i ka ʻikepili. Inā 'a'ole 0, 'o ia ho'i he 'ano 'ole ke ka'ina ho'oili, a laila ho'olei 'ia ka 'ikepili.
ʻO ka mea i luna nei ka wehewehe ʻike o ka "code detection error" i lawe ʻia e Shenzhen HDV photoelectric Technology Co., Ltd. ʻO nā huahana kamaʻilio i hana ʻia e ka hui uhi;
Māhele Module: nā modules fiber optical, Nā modules Ethernet, nā modules transceiver fiber optical, nā modules komo fiber optical, SSFP mau modula optical, a ʻO nā fiber optical SFP, etc.
ONUwaeʻano: EPON ONU, AC ONU, puluniu maka ONU, CATV ONU, GPON ONU, XPON ONU, etc.
OLTpapa: hoʻololi OLT, GPON OLT, EPON OLT, kamaʻilioOLT, etc.
Hiki i nā huahana module i luna ke hāʻawi i ke kākoʻo no nā hiʻohiʻona pūnaewele like ʻole. Hiki i kahi hui R&D ʻoihana a ikaika ke kōkua i nā mea kūʻai aku me nā pilikia ʻenehana, a hiki i kahi hui ʻoihana noʻonoʻo a ʻoihana ke kōkua i nā mea kūʻai aku e loaʻa nā lawelawe kiʻekiʻe i ka wā o ka kūkākūkā mua a me ka hana ma hope o ka hana. Welina mai iā ʻoe kāhea iā mā˚ou no kēlā me kēia ʻano nīnau.
