Ntakibazo cyakoreshwa kugirango ugere ku itumanaho ryicyambu, ntishobora gutandukana na protocole isanzwe.Ariko, Ethernet yagize uruhare mubigo byacuONUibicuruzwa bikurikirana ahanini bikurikiza IEEE 802.3.Hasi nintangiriro ngufi kumiterere ya IEEE 802.3
IEEE802.3 Imiterere yikadiri
Imikorere ya Media Access Control sublayer (MAC) nubuhanga bwibanze bwa Ethernet, igena imikorere nyamukuru ya Ethernet.Ubusanzwe MAC sublayer igabanyijemo ibice bibiri bikora: ikadiri ikingira / gupakurura no kugenzura itangazamakuru.Iyo uhuza imikorere yiyi sublayer, intambwe yambere nukumva imiterere yimiterere ya Ethernet
| Precode |Ikadiri Tangira Gutandukanya |Aho ujya |Inkomoko y'inkomoko |Uburebure |Amakuru |Kugenzura Ikadiri Ikurikirana |
| 7 bytes |1 byte |6 bytes |6 bytes |2 bytes |46-1500 bytes |4 bytes |
.Iyo ikadiri yashyizwe ku bitangazamakuru, uwakiriye ashobora gushiraho uburyo bwo guhuza bito, kubera ko kubijyanye na code ya Manchester, uburyo bwo kohereza hamwe na "1" na "0" intera ni intera ya kare.
.Iyo kode imaze gutambuka, irerekana intangiriro nyayo yikintu kugirango ushoboze uwakiriye kubona biti yambere yikintu gifatika.Nukuvuga, ikadiri nyirizina igizwe na DA + SA + L + LLCPDU + FCS isigaye.
.Irashobora kuba adresse imwe (ihagarariye sitasiyo imwe), aderesi nyinshi (zerekana itsinda rya sitasiyo), cyangwa aderesi zuzuye (zerekana sitasiyo zose kumurongo waho).Iyo aderesi nyinshi zigaragara kuri aderesi yerekanwe, bivuze ko ikadiri yakirwa icyarimwe nitsinda rya sitasiyo, izwi nka "multicast".Iyo aderesi igana igaragara nka aderesi yuzuye, bivuze ko ikadiri yakiriwe icyarimwe na sitasiyo zose kumurongo waho, bizwi nka "gutangaza".Ubwoko bwa aderesi busanzwe bugenwa na bito yo hejuru ya DA.Niba biti yo hejuru ari "0", yerekana aderesi imwe;Agaciro ka '1' yerekana aderesi nyinshi cyangwa aderesi zuzuye.Iyo aderesi yuzuye, umurima wa DA ufite code "1" yuzuye.
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(5) Uburebure (L): Byite ebyiri zose hamwe, zerekana umubare wa bytes muri LLC-PDU.
.Menya ko byibura LLC-PDU ifite uburebure bwa 46 bytes ni imbogamizi, isaba sitasiyo zose kumurongo waho kugirango ubashe gutahura iki kintu, ukemeza imikorere isanzwe.Niba LLC-PDU iri munsi ya 46 bytes, MAC sublayer ya sitasiyo yohereza izahita yuzuza kode "0" kugirango irangire.
.Nukugenzura kode ya 32-bit (CRC) igenzura ibiri mumakadiri yose usibye kubanziriza, SFD, na FCS.Kugenzura ibisubizo bya CRC kuva DA kugeza DATA bigaragarira muri FCS.Iyo kohereza sitasiyo yohereje ikadiri, ikora verisiyo ya CRC buhoro buhoro mugihe wohereje.Hanyuma, 32-bit ya CRC ikizamini irashirwaho kandi yuzuzwa umwanya wa FCS kumpera yikadiri yo kohereza hagati.Nyuma yo kwakira ikadiri kuri sitasiyo yakira, kugenzura CRC bikorwa buhoro buhoro mugihe wakiriye ikadiri imwe guhera kuri DA.Niba chequeque yashizweho na sitasiyo ya nyuma yakira ni kimwe na cheque yumurongo, byerekana ko ikadiri yoherejwe hagati itigeze isenywa.Ibinyuranye, niba sitasiyo yakira yemera ko ikadiri yangiritse, irasaba kohereza sitasiyo kohereza ikadiri binyuze muburyo runaka.
Uburebure bwikadiri ni DA + SA + L + LLCPDU + FCS = 6 + 6 + 2 + (46-1500) + 4 = 64-1518, ni ukuvuga, iyo LLC-PDU ari 46 bytes, ikadiri ni ntoya. n'uburebure bw'ikadiri ni 64 bytes;Iyo LLC-PDU ari 1500 bytes, ingano yikigero ntarengwa ni 1518 bytes.
Isosiyete yacu ifitanye isano numuyoboro ushyushye wo kugurisha ibicuruzwa bikubiyemo ubwoko butandukanye bwaONUibicuruzwa bikurikirana, harimo ACONU/ itumanahoONU/ umunyabwengeONU/ agasandukuONU, n'ibindiONUIbicuruzwa bikurikirana birashobora gukoreshwa muburyo bukenewe murusobe mubihe bitandukanye.Ikaze abantu bose baza kandi bafite ibisobanuro birambuye bya tekiniki kubicuruzwa.
