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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi N - Z > Reti di calcolatori > Calcolo finestra gbn e selective repeat
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saradid
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 Calcolo finestra gbn e selective repeat

Avendo 3 bit che rappresentano il numero di sequenza , quant'e' la finestra in go back n?
Aavendo 4 bit che rappresentano il numero di sequenza , quant'e' la finestra in selective repeat?
Grazie mille!
26-02-2008 14:32
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GiKappa
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gbn --> max_seq = 2^3 - 1 = 7
s-r --> (max_seq + 1)/2 = 16/2 = 8

questi sono giusti!

Last edited by GiKappa on 27-02-2008 at 09:29
26-02-2008 18:30
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saradid
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non mi tornano i conti....
27-02-2008 09:12
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GiKappa
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ecco:

in gbn la finestra k è uguale al max_seq quindi è 7

in s-r la finestra k è uguale al max_seq + 1 tutto diviso 2, quindi 8


si, ieri ero fuso! modifico il mio messaggio!:asd:
27-02-2008 09:29
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saradid
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si ok , ma hai provato a fare l'esercizio dell'utilizzo che ci e' uscito a gennaio?Io continuo a farlo ad esempio con la finestra 7 (per il gbn) e mi risulta sempre 6,8 .e non 8,6.
27-02-2008 09:34
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Utopia
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è normale ;)

una ragazza,in sede d'esame, ha fatto questa domanda alla prof... lei ha risposto: è possibile che abbia invertito le cifre :cool:
27-02-2008 10:14
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Mosco
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ah buono a sapersi...

è normale che per la seconda volta rispondo a tutte e 6 le domande di teoria e mi tocca sparare a caso la metà delle crocette rischiando ancora un voto inferiore al 18?? che senso hanno quelle cavolo di crocette che da quanto mi dite contengono anche errori?

bah...

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Laureato!!!! Non più presente su questo forum, non lasciate IM tanto non li leggo, mandate al massimo una Mail
28-02-2008 10:57
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