Real Time (3)

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Version 2 CSE, IIT Kharagpur

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=

Version 2 CSE, IIT Kharagpur

Legend: MSAU: Multistation Access Unit

MSAU

MSAU MSAU

MSAU

MSAU

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Logical Ring

Node not in the ring

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:

Version 2 CSE, IIT Kharagpur

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Version 2 CSE, IIT Kharagpur

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.

Version 2 CSE, IIT Kharagpur

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N1 10

0

1

0

1

0

N2 16

1

0

0

0

0

N3 20

1

0

1

0

0

Priority bits

n *'?7I/:+! = j:+*'57:*'(U@;u:+A/*'(:V"4(*05>6b]{/">,9. $'! `:*05>:+*v(U@o">:A/*'(:V"4(+*'576o(*0,-!h*08E/*'ZS*2EJ!=EB*'6^(+5W {S!#EB8*0m3!=ED8$'5>(+8=N9ORQ/!hEJI :+"%(*05>6r5>Ls!#">1VQP8H$05%(EJI/:V"4(+*'576B*28f(U@S./*01="%$0$'@o,h"7EJ! !#~7I<"%$J(+5!36 EJ&)(+5%&!36 E9./:+5>. ">?7"%(*05>6-EJ!3$2"[@X5>L<(+Q/!,-!=EJ*0I/,bN]Ly(Q/!8H$05%(`8*'m=!*28],h">EJ!">6S@i8,-">$'$0!3:z(+Q "%6-(+Q/*283l7(Q/!=6-(Q/!./:*05>:+*'(U@ ">:A/*'(:V"4(+*'576r8+1VQ/!3,-! 57I/$2Eq6/5>( 5>:+xq8H*06 13!9"b157$'$0*28H*05>6q!=Z>!=6 Q/!=6r*'(5J131I :+8 57I/$2Er6/5>(fAC!hEJ!(+!=1(!=E|N9u8$'5>(8*0m3!9$0">:?7!3: (+Q "%6B(Q/*28 T 5>I/$2Eq$0!="7TEq(+5">6B*06 1T :+!="78H!i*'6P1VQ ">6/6/!3$z*2EJ$0!i(+*',-!hEJT I/:+*06/?b!3Z>!=:@o8$'5>(=T Nh\Z>!3:(Q !=8!-8$05%(+8=lk!3Z7!3:+@o6/5JEJ!9(:V"%6 8,-*v(V8 (+Q/!g./:+*05>:+*v(U@DZ4"%$0I/!;5%L*'(+8iQ/*0?>Q/!#8U(i./:*05>:+*'([email protected]!36 E/*'6/?B,-!=8+8">?>! T *'(QK,h8AªW :V8U(-">8X8Q/5 T 6ª*06Fn*'?6/!357I 8 (+:+">6 8H,-*288*05>6LM5>$0$'5 T 8 9$'57?>*21%l/"-6/5JEJ!p(+Q "4((+:+">6 8,9*'(+8" *h">6 E:!#1!=*'Z7!=8R" Î l/xS6/5 T 8_(+Q "4((+Q/!3:+!*28"4($0!="78U(5>6 !6/5JEJ!p(Q "%( *28RQ "[ZS*'6 ?-"9Q/*0?>Q !3:./:+*'57:*'([email protected]!36 EJ*06/?h,-!=8+8+"%?>!7l/"%6 EEJ:+5>. 8R57IJ(5%L(Q/!135>6^(!=6^(*05>6|N

Î*

Version 2 CSE, IIT Kharagpur

O5p*'$0$'I<8U(+:+"%(!R(Q ! 57:xS*06/?5>L<(+Q/*28]./:+5%(5J135>$cl4(:V"%6 8,-*08+8*'576i5>LCA/*'(+8jA^@9EJ*'dC!=:!=67(j6 5SE/!=8]*06h"[email protected]%(Q !(*213">$/!{/">,9. $'!EJI :*06/? (+Q/!"%:+A/*'(:V"4(*05>6i*'6^(+!3:+Z[T ">$JQ ">8]8+1VQ/!=,-"%(*213">$'$0@A¿Ã/l7"%6<Ei¿ V ">:!R. ">:H(+*01& *0. "4(+*'6 ?*'6-(+Q/!">:A/*'(:V"4(+*'576-./:5J13!=8+83NORQ/!./:+*'57:*'(*0!=8j5%LkQ/*0?>Q/!#8U(`,-!#88+"%?7!=8]"4(`(Q/!6 5SE/!=8`¿ Î l^¿ÃJlS"%6<Eh¿ V ">:! Î * l Î-= l7">6 E;Ã* N u88HQ 5 T 6|l/6/5JEJ!X¿ Î EJ:+5>. 857IJ("4La(+!3:(+:+">6 8,9*'(H(+*'6 ?-(Q/!W<:+8H(A/*'(">8*'((+:+">6 8H,-*'(+8" *-A IJ($0*08H(!=6 8" Î NRS*0,9*0$2"%:+$'@7lJ(Q/!X6/5JEJ! ¿fÃ 5>I/$2E;EJ:+5>.h57IJ(_"%La(!3:s(:V"%6<8H,-*'(H(*06/?X(Q/!(Q/*0:+EgA/*'( Q/!=6g*'( 5>I/$2E-(:V"%6<8H,-*'(_" *i"%6 Eh$0*28U(+!36h(+5i" Î N]n*06 ">$'$0@>lS"4La(+!3:s(:V"%6 8H& ,-*'(H(T *06/?(Q/!s$0"78U(A/*'(=l46/5JEJ!_¿ V T 5>I $0E135>6 13$'I E/!j(Q<"4(*'(zTQ ">8|(Q/!_Q/T *0?>Q/!#8U(«. :*05>:+*v(U@f,-!=8+8">?>!`">6 E T 5>I/$2EAC!3?>*06*'(+8«(:V"%6 8,-*08+8*'576|N Arbitration

Transmission

n *0?>I :! : `:*05>:+*'(U@-u:A *v(+:+"%(*05>6*'6 *0:(I ">$«OR*',-! `:5>(5J157$ ·M¶[µ=²¯/É ·)¼KÅ p¶4»<µ=»|´7»<ÉH½`w6h(+Q/*08_./:+5%(+5J15>$C"6/5JEJ!fI 8!=8](+Q/!p8U(V"4(!5%Lk(+Q/!1VQ ">6/6/!=$ (+5X:+!=">85>6h">A<57IJ(`(+Q/!.C!36<EJ*'6 ?X. "71Vx>!(V8 :+!=8*0E/*'6/?-"4(5>(Q/!=:6/5JEJ!=8=Nj`"71VQg6/5JEJ! *'(Qo"X.<">1Vx>!3(R(5h8H!=6 E ">*v(V8`LM57:"%6*'6^(+!3:+Z[">$k5%L(*0,9!p(+Q "4(*28R*'6SZ7!3:V8H!=$'@h./:+5>.C5>:(*05>6<"%$ (+5i(+Q/!./:+*'57:*'(U@h5%LQ/*0?>Q/!#8U(./:+*'57:*'(U@;,-!=T 8+8+"%?>!*v(Q<">8=NjORQ "4(*28_(T Q/!$05 T !=:R*08_(+Q/!./:+*'57:*'(U@h5%Lz"i,-!#88+"%?7!(+Q "4("96/5JEJ!Q "783lS(+Q/! ,-5>:+!(+*',-!*'( T "%*'(+8=Nzu_(`(Q !!{J./*0:V"4(*05>6h5>Ly(Q/! T ">*v(+*'6/?(*0,9!7l^(Q/!6/5JEJ!8!36 8!=8j(Q/!f8U(V"4(+I 8j5>Lk(Q/!f1VQ "%6/6 !3$cNLk(+Q/!1VQ ">6/6/!=$ *28 A/I<8H@7l/(Q !36b(Q *08,9!#"%6 8(Q "%("-Q/*0?>Q/!=:./:+*'57:*'(U@;,-!=8+8+"%?>!*28AC!3*06/?h(+:+">6 8H,-*'(H(+!=Eo"%6<Eb*v(6 !3!=E 8(5 T "%*'(I/6^(*0$z"%6b*0E/$'!.C!3:+*05SE|N S56*28z"%$0:!#">EJ@(+">xS*'6/?./$2">1!7l#(Q/!=6X*'( T "%*'(+8«LM5>:(Q/!_6/!3{^(LM:V"%,-!>l45>(Q/!=: T *28H!`*v(]8U(V"%:(+8«(5(:V"%6 8,-*v(#N

N2

Propagation Time N1

n *0?>I/:+! , `:57A/$'!=, *'6 *':(I ">$«OR*0,9! `:5>(5J157$ } Q "%(X8HQ 5>I/$2ErAC!h(+Q/!;EJ*'dC!=:!=6 1!h*06 ">*v(p(*0,-!=85>Ls( 5b6/5JEJ!=8 Q/*01VQPQ "[Z7!-,9!#88+"%?7!=8 Q/5^8H!-./:+*'57:*'(*0!=8E/*vdy!3:AS@q576/!GF _!=1="%I 8!X5>L](Q/!9./:+5>. ">?7"%(*05>6oEJ!3$2"[@b*'6r(TQ/!96/!3( T 57:xyly";6/T 5JEJ!-13">6q6/T 5%(p*06 8U(V"%6^(+">6/!357I 8$'@bEJ!T (+!=1( T Q/!=6B">6/5%(+Q/!3:6/5JEJ!98H(+">:H(V8 (+:+">6 8H,-*288*05>6rEJI :*06/?b"%:+A/*v(+:+"%(*05>6|Nu8"g:+!=8I/$'(=lyI/6/$0!=8+8f(Q/! T "%*'((+*',-!-*08p"%(f$0!="78U(">8f$2"%:+?>!i"78(+Q/!-./:+5>. ">?7"4(+*'576b(*0,-!>lk(+Q/! LM57$'$05 T *'6 ?f. :57A/$'!=, T 5>I/$2E95S1=1I/:#Nu88I/,-!R(Q<"4(j( T 5p6/5JEJ!=8]¿ Î "%6 E-¿ÃfQ<"[Z>!_(Q/!=*':]. :*05>:+*v(+*'!#8]EJ*'dC!=:jAS@X5>6 !>NzuLa(!=:`¿ Î 8H(+">:H(V8 (+:+">6 8H,-*'(H(+*'6/?:">6^@(+*',-!9$'5 T !3:(Q ">6q(Q !i./:+5>.<"%?7"%(*05>6b(+*',-!>ly(+Q/!36B*v(13">6r6/5>(fEJ!3(!#1e(p(Q/!i(:V"%6<8H,-*288*'576o5%L ¿ Î ">6 E T 5>I/$2Er8H(+">:H((:V"%6 8,-*v((*06/? NiORQ/*08 T 5>I/$2Eq$0!="7Eo(+5135>$0$'*28H*05>6B"%6 Er*'6 135>:+:!#1e(f./:*05>:+*'(U@b">:A *v(+:+"%(*05>6|NORQ/*28fA<57I/6 E/8f(+Q/! EJ*'dy!3:+!36 13!A6 8!=13IJ(*0Z>!p./:+*'57:*'(*0!=8=N

>

Us` , *^ÃJN (*28"9./:+*'57:*'(U@;A "78H!#E;(+5>x>!=6b:*06/?-./:+5%(5J135>$cNjORQ/!Q/!="7EJ!3:5>Lz"9(+5>x7!36b15>6^(V"%*06 8_( T 59W !=$0E 83`"-. :*05>:+*v(U@-W(5J157$)l^(+5>x>!=6">$v(+!3:+6 "4(+!=8RAC!( T !3!=6g( T 5-,95JEJ!#83j"9:+!=8!3:+Z4"4(*05>6,-5SE/!>l ">6 E"iLM:+!3!p,-5JEJ!>N Î>Î

Version 2 CSE, IIT Kharagpur

Priority

Packet Payload

P Header Mode bit

n *0?>I :! . j^(+:I<1e(I :!5>L"-O«57x>!=6*06bU`` , *^ÃJN ( w6o:+!=8!3:+Z4"4(*05>6,-5JEJ!>lC. ">1Vx7!((+:+">6 8H,-*288*05>65S1=1I/:V8=NRORQ !./:+*'57:*'(U@;5%Lz(+Q/!X,-!=8+8+"%?>!f(+Q "4(f*08AC!3*06/?g(:V"%6 8,-*v((!=Eb*28:+!3?7*08H& (+!3:+!=Eq*06q(+Q/!9Q/!="7EJ!3:f5%Lj(+Q/!i(5>x7!36r"788Q/5 T 6B*'6Dn*0? N . Npu8f,9!#88+"%?7!=8. ">8+8(Q/:+5>I/?7Qo(Q !i:+*'6 ? ly!3Z7!3:+@6/5JEJ! T *'(QD.!#8*06 8.6oW!36BQ/!="7EJ!3:#Niu6/5JEJ!9Q "[ZS*06/?"Q/*0?>Q/!=:p./:*05>:+*'(U@o,9!#88+"%?7!>ly:+!3?>*28H(!3:V8*v(V8 ./:+*05>:+*v(U@o*06D(Q/!-./:+*'57:*'(U@bW !=$0ED5%Ls(Q/!hQ !=">E/!3:#Ni} Q/!=6D(Q/!-(+5>x>!=6B:+!(+I/:+6 8(5(Q/!;8!36<EJ*'6 ?6 5SE/!>l«*'(./IJ(V8f(Q/!-(+5>x7!36D*'6BLM:!=! ,-5JEJ!;"%6<Er:+!3$0!="78H!#8*'(=N;u8f(Q/!-(+5>x7!36D. ">8+8H!#8(Q/:+5>I/?7Qr(+Q/!h:+*'6/?!=6|l ./I/(+8*'(*'6^(+59:+!=8!3:+Z4"4(+*'576g,-5JEJ!>l ">6 E8U(V"%:(+8_(:V"%6<8H,-*'(H(*06/?:!( T 5-*0,-.<57:H(V"%6^(:!#8HI/$'(+8">A<57IJ((Q *08. :5>(5J157$)N ÈÅS» ¶4ÅS $9:;#/¼0:!=<<½ )&?> A @CÁ B?

DFE7

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^_#/0/1?( [Q\ZK O:!"CQA

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d

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D MN C

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*j

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Version 2 CSE, IIT Kharagpur

F

F

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Version 2 CSE, IIT Kharagpur

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Unsaturated Saturated

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Î1=

Version 2 CSE, IIT Kharagpur

low Bandwidth 802.5

GP(U) 802.4

U high Bandwidth 802.4

GP(U)

802.5

U

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802.5 802.4

ABU Bandwidth

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Î;:

Version 2 CSE, IIT Kharagpur

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A EM

HJ

LBE MN

B

C

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Host (Receiver)

Edge router

Edge router

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Version 2 CSE, IIT Kharagpur

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Version 2 CSE, IIT Kharagpur

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Output Buffers fixed delay Switch Switch

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Version 2 CSE, IIT Kharagpur

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Version 2 CSE, IIT Kharagpur

Eligible Time computation

Active Msgs

1

D M U X

Hold Queue

2 n−1

MUX

Departing msg

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Version 2 CSE, IIT Kharagpur

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Delay Bound PreAhead

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Deadline

Holding Switch i

Delay Bound

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Eligible

Deadline

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T2 Frame T1 Frame

n*'?7I/:+!Ã Î ]O T 95 ¾«!3Z>!=$|n/:V"%,-*06/? T *v(+Q Ã.

V

Version 2 CSE, IIT Kharagpur

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Regulator 1

Regulated Traffic

Priority level

Regulator 2

1

input

output

n Regulator h

Scheduler

Rate Controller

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V*

Version 2 CSE, IIT Kharagpur

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Version 2 CSE, IIT Kharagpur

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Version 2 CSE, IIT Kharagpur

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