Ubuchwepheshe-Ethernet kanye nentuthuko yayo

ubuchwepheshe kwe- - ezivamile lenhlangano amanethiwekhi wendawo. Namuhla inani layo lidlula sibalo kwezigidi ezinhlanu. Uma sikhuluma amakhomphyutha, anemisila inethiwekhi amakhadi, ezisebenza ubuchwepheshe-Ethernet, angaphezu kakhulu.

Lisho ukuthini leli umqondo ngomqondo ewumngcingo? Le ndinganiso zokuxhumana, eyayisekelwe inethiwekhi umshayeli Izernet Network. Lwakhiwe nge Xerox, ke waqalwa ngonyaka ayisikhombisa lesihlanu, namanje ekhulwini elidlule leminyaka. Nakuba le ndlela ihlolwe besebancane inethiwekhi umsakazo we-University of Hawaii. Kwathi engxenyeni sixties kwekhulu lamashumi amabili wesibili. Khona-ke sisebenzisa zonke izinhlobo izindlela lokufinyelela okungahleliwe umsakazo imvelo ezivamile. Le nqubo ibizwa ngokuthi lapho Aloha.

I-Ethernet-ubuchwepheshe ngonyaka ayisishiyagalombili kwekhulu lamashumi amabili ishintshile. izinkampani Dec, Intel kanye Xerox ngokuhlanganyela wadala futhi ishicilelwe nendinganiso-Ethernet 2 inethiwekhi. isisekelo kwawo kwakunjengokwetshe ikhebula coaxial, eye yinguqulo yakamuva ye-corporate-Ethernet ubuchwepheshe standard. Yingakho le nguqulo ibizwa ngokuthi i-Ethernet Dix noma 2.

Kususelwa kule ejwayelekile yasungulwa omunye okuthiwa IEEE 802,3. Anakho Kuningi ukufana okukhona phakathi esasisandulele, kodwa ethé ukuhluka kancane, lobu buchwepheshe-Ethernet usenayo. Nakuba le nguqulo entsha ngamazinga ahlukene MAC futhi LLC, umfowabo omdala omabili emazinga yahlanganiswa kusiteshi esisodwa. Thina Dix ezichazwe ukucushwa version ukuhlolwa olandelwayo ukuthi akuyona inguqulo entsha. Futhi i-aspect ratio kuhlukile kancane, kodwa-ke, esiphezulu kanye esincane Uhlaka osayizi kokubili ngezindinganiso ezifanayo.

I-Ethernet IEEE 802,3 ubuchwepheshe uvame ukubizwa, kuyilapho i-Ethernet Dix ngokuthi umane, ngaphandle izimpawu. Lokhu kwenziwa ukuze ukuhlukanisa indinganiso entsha evela kulowo odlule. Kuye ngokuthi uhlobo olunjani imvelo ngokomzimba isetshenziswa,-Ethernet IEEE 802,3 ubuchwepheshe standard inikeza ukuhlukahluka ezahlukene (10 Base-5, kanye 10 Base-2, 10Base-T s10Base-FL, futhi, ekugcineni, 10Base-FB).

Indinganiso, okwakubekelwa okutholwa ngokuthi ngonyaka ayisishiyagalolunye nanhlanu ekhulwini lamashumi amabili, Fast-Ethernet. Kuyinto kungalungile ukusho ukuthi akusiyo ezimele ngezindlela eziningi. Lokhu kuqinisekisa ukuthi incazelo okulula umphelelisi main 802,3 - kwesigaba 802.3i. Ngokufanayo, umuntu omusha wamukelwa ngonyaka 1998 - Gigabit Ethernet, elichazwa esinye isigaba 802.3z le dokhumenti eziyisisekelo.

Ukuze uthumele futhi wamukele ukwaziswa kanambambili intambo ngoba yonke ungqimba ngokomzimba kwezobuchwepheshe-Ethernet, esihlinzeka komkhawulokudonsa of megabits eziyishumi ngomzuzwana, isetshenziswa Manchester ikhodi. Kasibili zonke izindinganiso-Ethernet, kanye ukuqothulwa kwamahlathi, indlela ezifanayo osetshenziselwa medium separation ngesikhathi ukudluliswa kwedatha. Ibizwa ngokuthi CSMA / CD.

Sonke ngagijima wonke umlando ubuchwepheshe. Ezinsukwini ezimbalwa edlule wayesenguFakazi iminyaka engamashumi amane ubudala. Naphezu kwakho konke lokhu, luseyintandokazi. Namuhla, yebo, kukhona ubuchwepheshe obusha futhi kuwusizo kakhudlwana, kodwa cishe, ubuchwepheshe-Ethernet kuyoba iminyaka eminengi ukuhlinzeka inethiwekhi yethu ngoba okuthembekile, esiwusizo, yasetshenziswa ngempumelelo iminyaka leminyenti.