Koodu nchọta mperi (koodu nleba anya otu): koodu nlele parity nwere nkeji ozi n-1 na ihe nlele 1 bit. Ngalaba ozi bit N-1 bụ data ziri ezi na ozi anyị na-eziga, yana 1-bit check unit na-eji maka nchọpụta njehie na koodu redundancy.
Nlele dị iche:ma ọ bụrụ na ọnụ ọgụgụ nke 1 na usoro a bụ ọbụna, tinye 1 n'ihu ya, na ọnụ ọgụgụ nke 1 na-aghọ ihe na-adịghị mma, ma ọ bụghị tinye 0;
Ọbụna lelee:ma ọ bụrụ na ọnụ ọgụgụ nke 1 na usoro a dị njọ, tinye 1 n'ihu ya, na ọnụ ọgụgụ nke 1 na-aghọ ọbụna, ma ọ bụghị tinye 0;
Ọmụmaatụ: (1) 1111 odd check is 11111 even check is 01111
(2) 1110 nlele dị iche bụ 01110 ọbụlagodi nlele bụ 11110
Ihe e ji mara nke koodu nleba anya parity bụ na ọ nwere ike ịchọpụta naanị mperi mperi na-adịghị mma, yana ikike ịchọpụta njehie bụ 50%, nke enweghị ike idozi ya.
Koodu nchọpụta mperi (koodu CRC cyclic redundancy check): ọ bụ usoro nkewa ọtụtụ mmadụ iji chọpụta mperi. A na-ahụta eriri bit ọ bụla dị ka polynomial, a na-anakwere ọrụ modulo-2.
Usoro ngụkọ nke njedebe izipu bụ: usoro data a ga-eziga + usoro nlele nke r ibe n'ibe, na-ezigara etiti data ahụ, wee rụọ nkewa modulo-2 na polynomial emepụtara iji were nke fọdụrụnụ, nke bụ A ga-agbakwunye usoro nlele etiti FCS.
Usoro ngụkọ nke njedebe nke nnata bụ: mgbe njedebe na-enweta etiti ahụ, ọ na-eme nkewa modulo-2 na polynomial emepụtara, wee lelee nke fọdụrụ. Ọ bụrụ na nke fọdụrụ bụ 0, ọ pụtara na usoro nnyefe bụ ihe nkịtị, wee nabata data ahụ. Ọ bụrụ na ọ bụghị 0, ọ pụtara na usoro nnyefe adịghị mma, wee tụfuo data ahụ.
N'elu bụ nkọwa ihe ọmụma nke "koodu nchọpụta njehie" nke Shenzhen HDV photoelectric Technology Co., Ltd wetara. Ngwaahịa nkwurịta okwu nke ụlọ ọrụ na-emepụta;
Otu modul: ngwa anya eriri modul, Ethernet modul, ngwa anya eriri transceiver modul, ngwa anya eriri ohere modul, SSFP ngwa anya modul, na SFP ngwa anya eriri, wdg.
ONUudi: EPON ONU, AC ONU, eriri anya ONU, CATV ONU, GPON ONU, XPON ONU, wdg.
OLTklas: Mgbanwe OLT, Ọnụ ego nke GPON OLT, Ọnụ ego nke EPON OLT, nzikọrịta oziOLT, wdg.
Ngwaahịa modul dị n'elu nwere ike inye nkwado maka ọnọdụ netwọk dị iche iche. Otu ọkachamara na R & D siri ike nwere ike inyere ndị ahịa aka na nsogbu teknụzụ, na otu ndị ahịa na-eche echiche na ndị ọkachamara nwere ike inyere ndị ahịa aka inweta ọrụ dị elu n'oge ndụmọdụ tupu oge na ọrụ mmepụta ihe. Nabata gị kpọtụrụ anyị maka ụdị ajụjụ ọ bụla.
