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| Wysłany: Pon 5:48, 16 Kwi 2007 Temat postu: |
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| Wysłany: Czw 5:21, 05 Sty 2006 Temat postu: Metoda dostepu do mediów CSMA/CD |
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| Jeśli dwa urządzenia nadają dane jednocześnie, występuje kolizja, która jest wykrywana przez wszystkie urządzenia biorące udział w kolizji. Po wykryciu kolizji urządzenia czekają przez losowy czas, po czym dokonują retransmisji. | |
| Wysłany: Wto 20:01, 03 Sty 2006 Temat postu: 1. Opisz metodę dostępu do modułów CSMA/CD |
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| CSMA/CD jest to mechanizm dostępu danych używany w Ethernecie (czyli nasze sieci) oraz sieciach typu 802.3. Innymi słowy, określa on sposób w jaki pakiet danych jest umiejscowiony na kablu. CSMA/CD oznacza "Carrier Sense Multiple Access, with Collision Detection". Zanim urządzenie Ethernet wysyła pakiet po kablu, sprawdza czy inne urządzenie
w danej chwili nie transmituje danych. Kiedy urządzenie upewni się że kabel jest nieużywany, zaczyna wysyłać pakiet, nasłuchując czy inne urządzenie nie zaczęło wysyłać pakietu w tym samym czasie Metoda dostępu CSMA/CD, polegająca na sprawdzaniu zajętości kabla i powtórnej próbie przesyłania po pojawieniu się kolizji. |
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