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.dsy:it. : Powered by vBulletin version 2.3.1 .dsy:it. > Didattica > Corsi N - Z > Reti di calcolatori > Esercizio Selective Repeat
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Simeon
:D

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Abbiamo parlato di sto esercizio nel thread "testo esame 22 febbraio".

28-01-2008 12:51
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saradid
.grande:maestro.

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il risultato e' 320 ! non 426

28-01-2008 12:53
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ideafix
.grande:maestro.

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Scusate ma a me in effetti viene giusta la B!!! dove sbaglio?

allora Tp = 8000/(2*10^8)= 0,00004 seocondi

visto che come dicevamo k=5

U = 5* Tx
.......----------------
....... Tx+0,00008


visto che Tx = .....Frame Size
......................----------------
.......................16 000 000
Nel Caso B

Frame Size = 320 ---> Tx = 0,00002



................................................0,00002
Caso B Tx = 0,00002 --> U =5* ---------------- = 1
............................................0,00002+0,00008


:| non riesco a capire dove sbaglio??

[EDIT]
scusate i punti ma è per cercare di incolonnare! [/EDIT]

Last edited by ideafix on 28-01-2008 at 13:09

28-01-2008 13:00
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uvaci
.primate.

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per me dovrebbe essere cosi:

n=(2 x U x Tp x B) / (K - U) = 320 (con K = 5 e U = 1)

k è la dimensione della finestra, che è uguale sia con sel rep che con gobackn. Qui non si parla di numeri di sequenza.

28-01-2008 13:04
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ideafix
.grande:maestro.

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Be insomma siamo tutti daccordo che quella giusta è B quindi?

28-01-2008 13:08
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poi_1969
.grande:maestro.

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tp = 4 10(-5)

u= k*1
------
1+2tp/tx

u=1 e k=5

5=1+2tp/tx

ricavo frame da tx

frame = 2tp * 16 10(6) / 4

28-01-2008 13:21
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NoWhereMan
.illuminato.

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320 anche perché se 5 fosse max_seq (e quindi k=3) verrebbe 640

28-01-2008 17:21
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