Token Ring
5
n \-, A €mbia il loken in una trama datl agglungendogfi. dali e Indirizzo (stazionsu) A aspstta il token A rlmuove la trma datl 6 gsnera ll token C copla i dati e attlva il 6it 'daii coPlatl"
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Lezioni sulla token ring dei giorni 7-8 aprile
Transcript of Token Ring
n\-,
A €mbia il loken in unatrama datl agglungendogfi.
dali e Indirizzo (stazions u)
A aspstta il token
A rlmuove la trma datl6 gsnera ll tokenC copla i dati e attlva
il 6it 'daii coPlatl"
TOKEN sD = srArf f i AC,_ACC
| | | I ED=END
I 'o lo" l=o]I
111
II| | PPP PRroRrrÀ (o + 7)
| | ; ;:t:fiì;;JI nnn PRENoTMToNE ]
TRAMA
sFs i
= MASSTMA)
\,lA INFORMATIVA *
r{=roxrruorNFor.
SD AC k{ DA SA INFO FCS ED FS
1 1 /{
2t6 a8
/ \ |
fa? LULLLLI1t,1P'o /
1 'Blr=0INDIVIDUALE
l.rrftú r O'O --./ 1" BIT - 1 GBUPPO
Vvv 'r-- 0 IAtsORT
[-----'r.---lt l tlsDEDll l
1
Lrroro
ó
(a)
(c)
(e)
(S) (h)
, X,Y. X = LIVELLO Dl PRIORITA Y = RICHIESTA Ot pRtORttÀ
z z = Ttpo Dt TRAMA (F = TRAMA DAT|, T = TOKEN)
2.0T
:!-' 1l
2,1 1.0
lr --r*
'1
.,èo,2F ,t"
+i{-g!*
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4- . 'q
.T
dq priorità
mz=n
;z
f,m-tmt'-
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o "[tr(&x
Phisical t ra l ler(6 byles)Physical header (var iable ìenght)
SD AC FCDest inat ion
AddressSou rce
Address RI Frame check sequence I ED FS
Bits. ' O'7 ''--r'-----l
i l i l l lV,V L0 ,V rV '0 '0 r 01
l r r r l t ! ]
l l l l lL
tBlts
0-5 l617Bitso-7
I\
(a)
SD -
Starting DellmelerAC = Access ControlFC = Frame ControlRl = Routlng Information (Optional)V = Code ViolalìonPM = Priorltv ModeT = TòIèhBTMC = Monltor CountPR = Prioritv ReservationFF - Frame'Fdi6àÎ---R = Reserved
r%d
Startlngdelimeler Access control
Endinodellmetér
ED = Endlng DelimeterFS
- Frame Status
L = '#l[ffi Frame Bit
A = Addr€ss Recognized BitsC = Frame Copled BitsBits +I
o-7 I-Bits----leBfts+lo'-D 24 a-7 | o-7 I
o-2 t3t4 ú7 4-7 -
PM '13PR *l-l'Control
o-7 | o-2 34
VVOVVOOO PM - lM' lc PR VVIVVIOO
l l l lL l l l l l r r l
viv i r iv iv i r I r leìalc in in in ic int ! ! l l l l l l l l
r l l l l 'L
