Ethernet FDDI 2012-05-29 Homepage 1
Transcript of Ethernet FDDI 2012-05-29 Homepage 1
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Lecture Computer Networks
Ethernet and FDDI
Prof. Dr. Hans Peter Großmann mit M. a!e" sowie
H. Hutschenreiter und #. Nau $ %ommersemester &'(& $
Institut f)r *r+anisation und Mana+ement ,on
Informationss-stemen
#homas Nau ki/
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e &
Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD 1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e 7
History - Ethernet and DIX Consortium
Creation of Ethernet
• !- Dr. o!ert Metca"fe
• at 8ero9 Corporation in Pa"o 4"to Ca"ifornia (:;7
• operated at &.: Consortium
• de,e"oped the standard for ('M!ps Ethernet (:?'
• thick mu"ti2drop coa9ia" ca!"e
IEEE ?'& standards (:?'
• IEEE ?'&.7 for Ethernet
• IEEE ?'&.< for #oken @us
• IEEE ?'&.A for #oken in+
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In the beginning
(:;B . Metca"fe presented Ethernet for the first time he used this dia+ram
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Evolution
Ethernet
('M!5s
FastEthernet
(''M!5s
Gi+a!itEthernet
('''M!5s
(:;7 (::?
(' Gi+a!itEthernet
(''''M!5s
&''&(::A(:?'
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IEEE Standards
8 0 2 . 7 B r o a d b a n d T a g
8 0 2 . 8 F i b e r O p t i c T a g
L A N
W i r e l e s s
8 0 2 . 1 18 0 2 . 9
D Q D B
8 0 2 . 6
R i n g
8 0 2 . 48 0 2 . 3
E t h e r n e t
LAN B u s
T o k e n
8 0 2 . 1 B r i d g i n g
8 0 2 . 2 L o g i c a l L i n k8 0 2 . 1
S e c u r i t y O v e r v i e w
8 0 2 . 1 0
8 0 2 . 5
T o k e n
S e r v i c e s
I n t e g r a -
t e d
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e ;
Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD 1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e ?
OSI Layers
4pp"ication
Presentation
%ession
#ransport
Data Link
Network
Ph-sica"
LLC
M4C
PH
PMD
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e :
Sub-Layers
LLC Lo+ica" Link Contro"
=de>mu"tip"e9in+ packets from the network"a-ers
M4C Media 4ccess Contro"
frame formats addressin+ sharin+ of themedium
PH ph-sica" medium independent "a-er
encodin+5decodin+ !its into pu"sess-nchroni/ation of the transcei,er c"ocks
PMD Ph-sica" Medium Dependent La-erhand"in+ with e"ectrica" components
LLC
M4C
PH
PMD
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Inter-Layer Connections
M4C
PH
PMD
M4C
PH
PMD
Frames
%-m!o"s
Pu"ses
(('(
(('((
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Bandidth Sharing !Hal" Du#le$ %ode&
For a !us or an- other ha"f dup"e9 topo"o+- a method for !andwidthsharin+ is mandator-.
In the de,e"opment da-s of the Ethernet the fo""owin+methods were tested3
Pure 4"oha
%"otted 4"oha
C%M4
C%M45CD
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CS%'(CD
Carrier %ense Mu"tip"e 4ccess with Co""ision Detection
• ait unti" medium is a,ai"a!"e
• medium must !e id"e for the Interframe Gap =IFG> time !efore
sendin+
• %tart transmission
• If a co""ision is detected whi"e transmittin+
• transmit a am si+na"• wait for a random time and retr- =up to (B times>
• Co""ision detection is done !- comparin+ transmitted andrecei,ed si+na"s
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CS%'(CD
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Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD 1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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Ethernet )ersions
#wo incompati!"e ,ersions3
• Ethernet II =DI8 2 consortium of the companies DEC Inte" and 8ero9>
• Ethernet ?'&.7 =standard of IEEE>
• PMD PH and M4C "a-ers are co,ered in the standardIEEE ?'&.7
• LLC 2 co,ered in the standard IEEE ?'&.&=+enera" standard not on"- for Ethernet>
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Ethernet II *rinci#les
• Fi9ed ('M!ps Manchester coded si+na"s
• C%M45CD used for !andwidth sharin+
• Frame si/e ran+e B< to(A(? !-tes
• #runcated !inar- !ack2off a"+orithm used for retransmission
• Litt"e2endian !it2order
• B< !it pream!"e at front and :.Bs de"a- !etween frames
• @us topo"o+-
• Ethernet is a passi,e network on"- transmittin+ stations can !e
detected
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E$am#le "or a Bus +o#ology !very obsolete by no&
('M!5s
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E$am#le "or a Star(+ree +o#ology
(''M!5s (''M!5s
(''M!5s
(''M!5s (''M!5s
(''M!5s('M!5s
(''M!5s ('M!5s (''M!5s
('M!5s
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E$am#le "or a Star +o#ology
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Hal"-du#le$ %ode
• %tations share a sin+"e Ethernet channe" !- usin+ a medium accesscontro" protoco" =see C%M45CD>
•
*n"- one station can send data o,er the channe" at an- +i,en time
• Disad,anta+e3 se+ment "en+th is "imited !- timin+ reuirementcaused !- reuirements of co""ision detection mechanism
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*hysical E$tension
• Ethernet cards detect co""isions on"- whi"e transmittin+. 4 co""isionthat occurs at the far end of the medium must reach the sender!efore it stops transmittin+.
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Collision Domain
epeater epeater
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Se#arate Collision Domains
epeater
%witch
epeater epeater
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Full-du#le$ %ode
• Point2to2point "inks o,er twisted pair or fi!er optic media
• @oth de,ices ma- send data at an- time
• Disa!"e the carrier sense function
•
Disa!"e co""ision detect• Disa!"e the "oopin+ !ack of transmitted data onto the recei,er
input
• 4d,anta+es3
• %e+ment "en+th is "imited !- the si+na"2carr-in+ capa!i"ities of the
se+ment media
• #he mu"tip"e access a"+orithm =C%M45CD> is unnecessar-
• %tandard IEEE ?'&.79
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Framing
• La-er & encapsu"ation
• @reakin+ the stream into fie"ds
• %tart and stop indicator fie"ds
• Namin+ or addressin+ fie"ds
• Data fie"ds
• ua"it- contro" fie"ds
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IEEE %'C 'ddress
I5G Indi,idua"5Group
J5L Jni,ersa"5Loca"
*JI *r+ani/ationa""- Jniue Identifier
specifies the manufacturer of the Ethernet card
I / G U/L
1 Bit1 Bit
OUI
22 Bit
assigned by OUI owner
24 Bit
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Ethernet II Frame
Pream!"e for s-nchroni/ation of the stations
#-pe specifies La-er 7 Protoco"FC% Frame Check %euence
Frame Header
FC%
=< @-te>
Data
=
Destination
4ddress
=B @-te>
Pream!"e
=? @-te>
%ource
4ddress
=B @-te>
#-pe
=& @-te>
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Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD
1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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Some o" the !very old& Standards "or ,%bit(s
%tandard2first re"eased
#opo"o+- Medium Ma9 Ca!"e%e+ment Kmha"f2dup"e9
fu""2dup"e9
('@aseA DI82(:?'?'&.72(:?7 @ussin+"e A' *hmcoa9ia" ca!"e =('mmthick> 2 thicknet
A''notsupported
('@ase& ?'&.7a2(:?A @us sin+"e A' *hm GA? coa9ia" ca!"e=Amm thick> 2 thinnet
(?A notsupported
('@ase2# ?'&.7i2(::' %tartwo pairs of ('' *hm
Cat7 or !etter J#Pca!"e
('' (''
('@ase2F ?'&.72(::7 %tar two optica" fi!res &''' &'''
(' stands for ('M!it5s
@ase stands for @ase!and
C N k $ E h d FDDI $ % &'(&P 7'
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Standards "or ,%bit(s
%tandard2
first re"eased
#op. Medium Ma9 Ca!"e
%e+ment Kmha"f2
dup"e9
fu""2dup"e9
(''@ase2#8 ?'&.7u2(::A %tar two pairs of ('' *hmCatA J#P ca!"e
('' (''
(''@ase2F8 ?'&.7u2(::A %tar two optica" fi!res
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Standards "or ,.bit(s
%tandard2firstre"eased
#op. Medium Ma9 Ca!"e%e+ment Kmha"f2dup"e9
fu""2dup"e9
('''@ase2L8 ?'&.7/2(::? %tar"on+ wa,e"en+th "aser3
2 B&.AGm mu"ti2mode fi!er
2 A'Gm mu"ti2mode fi!er
2 ('Gm sin+"e2mode fi!er
7(B
7(B
7(B
AA'
AA'
A'''
('''@ase2%8 ?'&.7/2
(::?
%tar short wa,e"en+th "aser32 B&.AGm mu"ti2mode fi!er
2 A'Gm mu"ti2mode fi!er
&;A
7(B
&;A
AA'
('''@ase2C8 ?'&.7/2(::?
%tar specia"t- shie"ded !a"ancedcopper Fumper ca!"eassem!"ies =Ntwina9O>
&A &A
('''@ase2# ?'&.7a!2
(:::
%tar four pairs of ('' *hm CatA or
!etter ca!"e ('' (''
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Encodings used by the IEEE Standards
Ethernet Manchester codin+
Fast Ethernet (''@ase2F8 NI and and
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*arameters
('M@it5s (''M@it5s (G@it5s
nomina" @it #ime '( s ''( s '''( s
%"ot #imeK@it #imes
A(& A(&
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Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD
1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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.igabit Ethernet Standards
Media 4ccess Contro"=M4C>
fu"" dup"e9 5 ha"f dup"e9
Gi+a!it Media Independent Interface =GMII> optiona"
?@5('@
encodin+5decodin+
('''@4%E2#
encoder5decoder
('''@4%E2L8
LL
Fi!er *ptic
('''@4%E2%8
%L
Fi!er *ptic
('''@4%E2C8
%hie"ded
@a"anced Copper
('''@4%E2#
J#P
Cate+or- A
?'&.7/ ph-sica" "a-er ?'&.7a! ph-sica" "a-er
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e 7B
%igration to .igabit Ethernet
• Gi+a!it Ethernet "ooks identica" to Ethernet from data "ink "a-erupwards
• Chan+es are made to ph-sica" interface
•
Gi+a!it Ethernet Ph-sica" Media 4ttachment =PM4> is identica" toFi!er Channe" PM4
• %tandard takes ad,anta+e of
• Hi+h speed ph-sica" interface of fi!er channe"
•
IEEE ?'&.7 Ethernet frame format• Fu"" or ha"f dup"e9 C%M45CD
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Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e 7;
IEEE /0123 .igabit Ethernet
Jpper La-ers
Lo+ica" Link Contro" =LLC>
M4C
econci"iationeconci"iation
PC%PC%
PM4
PMD
PM4
PMD
Medium Medium
(''M!ps ('''M!ps
MII GMII
GMII3 Gi+a!it Media IndependentInterface
PM43 Ph-sica" Media 4ttachment
PMD3 Ph-sica" Media Dependent
econci"iation3 Mappin+ !etween30 Ph-sica" "a-er si+na"in+ primiti,es Q0 %i+na"s on GMII
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Frame Formats
. . . . . .
. . . .
. . . . . .
Pream!"e
D a t a L i n k L a - e r
E n c a p s u " a t i o n
%tart2of2Frame De"imiter
Destination
4ddress
%ource
4ddress
Len+th5#-pe
Data
Frame Check
%euence
; octets
( octet
B octets
B octets
& octets
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*roblems ith .igabit Ethernet
In ha"f2dup"e9 mode the ph-sica" e9tension wou"d 2 without further
measures 2 !e "ess than &' meters
eason3 dependence !etween minimum si/ed frames speed andph-sica" e9tension
#he minimum C%M45CD carrier time and the Ethernet s"ot timeha,e !een e9tended to A(& !-tes.
*ac4ets A(& !-tes are not modified
*ac4ets R A(& !-tes ha,e a carrier e9tension fie"d fo""owin+ the CC fie"d
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Frame ith E$tension Field
Packets sma""er than A(& @-te wi"" !e e9tended with an additiona"
fie"d3
FC%=< @-te>
DataDestination 4ddress
=B @-te>
%ource 4ddress
=B @-te>
#-pe5Len+th=& @-te>
E$tension
A(& @-te
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p $ $+
*ac4et Bursting
Mechanism to impro,e the performance of the sma"" si/ed packets3
the de,ices are a""owed to send some sma"" packets to+ether
!ut a !urst "imit is defined too3
one transmission of a station must not !e "on+er than BAA7B !it
times
A(& @-te
Frame ( E9tension Frame & Frame 7 Frame n
Inter2Frame2Gaps
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p $ $+
Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD
1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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p $ $
)L'5s !)irtual Local 'rea 5etor4&
outer
6L4N 4
6L4N @
6L4N C
%witch%witch%witch
H H
HH
HHH
HH
H
HH
H3 Host
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Bene"its o" )L'5s
• Faci"itatin+ network administration
• 4""owin+ formation of work +roups
• Enhancin+ network securit-
• Pro,idin+ a means of "imitin+ !roadcast domains
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)L'5 Standards
• IEEE ?'&.7ac =(::?> defines frame format e9tensions to support6irtua" Loca" 4rea Network =6L4N> #a++in+ on Ethernetnetworks.
• IEEE ?'&.( defines the +enera" 6L4N protoco".
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)L'5 +ag
#he 6L4N protoco" permits the insertion of an identifier
or Sta+S into the Ethernet frame format to identif- the 6L4N to
which the frame !e"on+s. It a""ows frames from stations to !e
assi+ned to "o+ica" +roups.
FC%
=< @-te>
Data
=
Destination
4ddress
=B @-te>
%ource
4ddress
=B @-te>
Len+th5
#-pe?'&.(
#a+ #-pe
=& @-te>
-$/,--
#a+ Contro"
Information
=& @-te>
Len+th5
#-pe
=& @-te>
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Ethernet and FDDI
0 Ethernet
1 Histor- E,o"ution *,er,iew
1 *%I2Mode"
0 Ph-sica" La-er3 Codin+ %chemes
0 M4C2La-er3 C%M45CD
1 Ethernet Princip"es
0 6ersions and Parameters
0 #opo"o+ies
0 Communication Modes
0 Co""ision Domain
0 Framin+ 1 %tandards up to Gi+a!it Ethernet
1 Gi+a!it Ethernet
1 6L4N
0 FDDI
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FDDI !Fiber Distributed Data Inter"ace&
• (''M!ps !andwidth
• Jp to A'' stations in one network
• Jp to B'km !etween two stations
• #ota" "en+th &''km
• Guaranteed waitin+ time
• edundanc- in topo"o+-
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FDDI Summary
• Fi9ed (&AM!ps
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FDDI +o#ology
Dua" in+
in+ with #rees
#ree
Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e A(
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FDDI Stations
primar- rin+D4%D4%
D4C
%4%%4%
@
@
@ 4
4
4
MM%%
D4%3 Dua" 4ttachment %tationD4C3 Dua" 4ttachment Concentrator %4%3 %in+"e 4ttachment %tation
43 Primar- Port@3 %econdar- PortM3 Master Port%3 %"a,e Port
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FDDI Frame
%tartin+De"imiter =& s-m!o"s>
Information
=RT ?:AB>
Destination 4ddress
=(& s-m!o"s>
FrameContro"
=& s-m!o"s>
%ource 4ddress
=(& s-m!o"s>
Endin+De"imiter =( s-m!o">
Frame%tatus
=7 s-m!o"s>
Error Detected=( s-m!o">
FrameCopied
=( s-m!o">
4ddresseco+ni/ed
=( s-m!o">
C L F F
#-pe of Frame
Len+th of 4ddress'T(B!its (T
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'ccess %ethod
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FDDI 'ccess %ethod
• #here are & t-pes of transfers3 s-nchronous and as-nchronous
• %-nchronous transfers can !e done whene,er the station +ets the
token was ne,er rea""- used
• 4s-nchronous traffic can !e started whene,er the station +ets a
token that is not "ate
• #he "ast frame is a"wa-s a""owed to comp"ete
•
#he token is immediate"- re"eased after transmission
• #he transmittin+ station remo,es its own data
Computer Networks $ Ethernet and FDDI $ %ommersemester &'(&Pa+e AB
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+o4en 7elease %ethods
%
#okenFrame
Immediate e"ease
%
#oken Frame
De"a-ed e"ease
asted #ime
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FDDI Error Detection
• 4 station suspects a fau"t in the rin+
• It starts sendin+ !eacon frames
• E,er- station that recei,es a !eacon frame stops sendin+ !eacons
• If a station recei,es its own !eacon e,er-thin+ is *U
• E"se the rin+ is !roken ri+ht !efore the station
• #he %M# takes action
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FDDI 7ing 6ra##ing and Hold
F E D
4 C@
wrappin+ resu"ts in partitions
F E D
4 C@