Iqonde ngqo
Ukushintsha kwe-Ethernet okuqondile kungaqondwa njengokushintshwa kwe-matrix yomugqa enemigqa enqamulayo phakathi kwezimbobo. Uma iphakethe ledatha litholwa endaweni yokufaka, inhlokweni yephakethe iyahlolwa, ikheli lephakethe lephakethe liyatholwa, ithebula lokusesha eliguquguqukayo langaphakathi liyaqalwa, bese kuguqulwa imbobo ehambisanayo yokuphumayo. Iphakethe ledatha lixhunywe empambanweni yokokufaka nokukhiphayo, futhi iphakethe ledatha lixhunywe ngokuqondile embobeni ehambisanayo ukuze kubonakale umsebenzi wokushintsha. Ngenxa yokuthi ayidingi ukugcinwa, ukubambezeleka kuncane kakhulu futhi ukushintshwa kuyashesha kakhulu, okuyinzuzo yayo. Okubi ukuthi njengoba okuqukethwe kwephakethe ledatha kungalondolozwa ngokushintsha kwe-Ethernet, akunakwenzeka ukuhlola ukuthi iphakethe ledatha elidlulisiwe alilungile, futhi amandla okuthola iphutha alikwazi ukuhlinzekwa. Ngenxa yokuthi ayikho inqolobane, izimbobo zokufaka/zokukhiphayo zesivinini esihlukile azikwazi ukuxhunywa ngokuqondile, futhi kulula ukulahlekelwa.
Gcina futhi uye phambili
Imodi yokulondoloza nokudlulisela phambili iyimodi yohlelo emkhakheni wamanethiwekhi ekhompyutha. Iqala igcine iphakethe ledatha yembobo yokufaka, bese yenza isheke le-CRC (ukuqinisekiswa kwekhodi ye-cyclic redundancy), ikhiphe ikheli lephakethe ledatha ngemva kokucubungula iphakethe lephutha, futhi iliguqulele embobeni yokukhipha ukuze ithumele iphakethe ithebula lokusesha. Ngenxa yalokhu, ukubambezeleka kokugcinwa nokudlulisela phambili ekucutshungulweni kwedatha kukhulu, okuwukushiyeka kwayo, kodwa kungakwazi ukubona ngokungalungile amaphakethe wedatha angena ekushintsheni futhi kuthuthukise kakhulu ukusebenza kwenethiwekhi. Okubaluleke kakhulu ukuthi ingakwazi ukusekela ukuguqulwa phakathi kwamachweba wesivinini esihlukile futhi igcine umsebenzi wokuhlanganyela phakathi kwezimbobo ezinesivinini esikhulu nezimbobo ezinesivinini esiphansi.
Ukuhlukaniswa kwesiqephu
Lesi yisixazululo phakathi kokubili kokuqala. Ihlola ukuthi ubude bephakethe ledatha banele yini amabhayithi angu-64. Uma ingaphansi kwamabhayithi angu-64, kusho ukuthi iphakethe lomgunyathi futhi iphakethe liyalahlwa; uma likhulu kunamabhayithi angama-64, iphakethe liyathunyelwa. Le ndlela ayinikezi ukuqinisekiswa kwedatha. Isivinini sayo sokucubungula idatha siyashesha kunokugcina nokudlulisela phambili, kodwa sihamba kancane kunokudlula okuqondile. Sethula ukushintshwa kweswishi yakwa-Hirschman.
Ngesikhathi esifanayo, ukushintshwa kwe-Hirschman kungadlulisela idatha phakathi kwamachweba amaningi. Imbobo ngayinye ingathathwa njengengxenye yenethiwekhi ebonakalayo ezimele (inothi: ingxenye yenethiwekhi engeyona eye-IP), futhi amadivayisi enethiwekhi axhunywe kuyo angajabulela wonke umkhawulokudonsa ngokuzimela ngaphandle kokuncintisana namanye amadivaysi. Lapho i-node A ithumela idatha ku-node D, inodi B ingathumela idatha ku-node C ngesikhathi esifanayo, futhi bobabili banomkhawulokudonsa ogcwele wenethiwekhi futhi banokuxhumana kwabo okubonakalayo. Uma kusetshenziswa iswishi ye-Ethernet engu-10Mbps, inani lethrafikhi yeswishi lilingana no-2x10Mbps=20Mbps. Uma kusetshenziswa i-HUB eyabelwe engu-10Mbps, inani lethrafikhi le-HUB ngeke lidlule u-10Mbps.
Ngamafuphi, i-Ukushintsha kwe-Hirschmaniyidivayisi yenethiwekhi engaqedela umsebenzi wokuhlanganisa nokudlulisa amafreyimu edatha ngokusekelwe ekubonweni kwekheli le-MAC. Iswishi yakwa-Hirschman ingafunda amakheli e-MAC futhi iwagcine kuthebula lekheli langaphakathi, futhi ifinyelele ngokuqondile kulokho okuhlosiwe ngokusebenzisa iswishi yesikhashana phakathi komsunguli nomamukeli oqondiwe wohlaka lwedatha.
Isikhathi sokuthumela: Dec-12-2024