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INTERNATIONAL TELECOMMUNICATION UNION

ITU-T Y.1541TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU

(Draft 10/01)

SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE

Network Performance Objectives for IP-Basedervices

&NN%, ,to t?e Report o ; 9/13

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ITU-T (%).//%ND&TI.N #141

NETWORK ERFORMANCE OB!ECTI"ES FOR I#BASEDSER"ICES

Summary

T?is Re#ommendtion deines #%sses o net7or: +u%ity o Ser&i#e ,+oS nd spe#iies pro&ision%o"

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).NT%NTS

1 S).P%#########################################################################################################################################################################1

2 (%%(%N)%S###########################################################################################################################################################1

" &''(%3I&TI.NS#####################################################################################################################################################2

4 N%TW.( P%(.(/&N)% W5%N S./% P&)%TS &(% N.N-).N.(/IN6################################"

N%TW.( P%(.(/&N)% .'7%)TI3%S#####################################################################################################4

5.1 Gener% dis#ussion o +oS..........................................................................................................................................95.2 +oS #%sses.................................................................................................................................................... ......... .9

5.2.1 Nature of the network performance objectives.............................................................................................55.2.2 Unbounded (unspecified) performance.........................................................................................................6

8 &3&I9&'I9IT .'7%)TI3%S###############################################################################################################################:

; &99.)&TI.N . T5% P%(.(/&N)% .'7%)TI3%S##############################################################################10

.1 Gener% #onsidertions or %%o#tion ru%es..........................................................%rror< 'oo=mar= not de>ined#

.2 Route %enFt? #%#u%tion........................................................................................%rror< 'oo=mar= not de>ined#

&??endi$ I &T/ net@or= AoS su??ort o> IP AoS#########################################################################################################

&??endi$ II IP Delay 3ariation ?arameter de>inition considerations############################################################################

&??endi$ III 5y?otBetical (e>erence PatBs >or !alidatinC tBe IP ?er>ormance oEecti!es########################################

&??endi$ I3 /aterial rele!ant to IP ?er>ormance measurement metBods##################################################################

&??endi$ 3 &??licaility o> tBe I%T InteCrated Ser!ices and Di>>erentiated Ser!ices to IP AoS classes############

&??endi$ 3I (elationsBi?s amonC transit delay oEecti!es###########################################################################################

&??endi$ 3II 'ilioCra?By###################################################################################################################################################

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(ecommendation #141

N%TW.( P%(.(/&N)% .'7%)TI3%S .( IP-'&S%D S%(3I)%S

1 Sco?e

T?is Re#ommendtion spe#iies ; perormn#e &%ues to "e #?ie&ed interntion%%y or e#? o t?eperormn#e prmeters deined in T-T Re#ommendtion 8.1590. Some o t?ese &%ues depend on7?i#? +u%ity o Ser&i#e ,+oS #%ss t?e end-users nd net7or: pro&iders Free on. T?isRe#ommendtion deines si* dierent +oS #%sses. T?is Re#ommendtion pp%ies to interntion%end-to-end ; net7or: pt?s. T?e +oS #%sses deined ?ere re intended to "e t?e "sis o Freements

"et7een end-users nd net7or: ser&i#e pro&iders nd "et7een ser&i#e pro&iders. T?e #%sses s?ou%d#ontinue to "e used 7?en stti# Freements Fi&e 7y to dynmi# reJuests supported "y +oS

spe#ii#tion proto#o%s. T?e %imited num"er o +oS #%sses deined ?ere support 7ide rnFe opp%i#tions in#%udinF t?e o%%o7inF point-to-point te%ep?ony mu%timedi #oneren#inF ndinter#ti&e dt trnser. ?i%e t?e perormn#e needs o t?ese pp%i#tions re more demndinF t?nmost t?ere my "e ot?er pp%i#tions t?t reJuire ne7 or re&ised #%sses. Any desire or ne7 #%ssesmust "e "%n#ed 7it? t?e reJuirement o esi"%e imp%ementtion nd t?e num"er o #%sses must "esm%% or imp%ementtions to s#%e in F%o"% net7or:s.

T?e +oS o"

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KDL T-T Re#ommendtion E.51eference -onnections for /raffic &n#ineerin# of , 0ccessNetworks'

" &re!iations

T?is Re#ommendtion uses t?e o%%o7inF ""re&itions

ATM a2%3r&& traf$r '&$AF ar$ f&r4ar*5CBR %&tat 6*t rat$CD" %$ $a2 .ar*at*&CER %$ $rr&r rat*&CLR %$ & rat*&CS %*r%*t $%t*&DS *ff$r$t*at$ $r.*%$DST $t*at*& 3&tE1 D*5*ta 7*$rar%32 Tra'**& at 8+0-9 M6E; D*5*ta 7*$rar%32 Tra'**& at ;- M6

EF $

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STD taarT1 D*5*ta 7*$rar%32 Tra'**& at 1+,-- M6T; D*5*ta 7*$rar%32 Tra'**& at -, M6T'a< 'a$t $a2 6$2& 43*%3 t3$ a%>$t * $%ar$ t& 6$ &tTa. '**'' $5t3 &f t*'$ &f I a.a*a6**t2 '**'' $5t3 &f t*'$ &f I a.a*a6**t2TBD t& 6$ $t$r'*$TC tra'**& %&tr& r&t&%&TDMA t*'$ *.**& 't*$ a%%$

TOS t2$ &f $r.*%$TTL t*'$ t& *.$UD $r ata5ra' r&t&%&"TC .*$& t$$%&f$r$%$

4 Trans>er )a?acityF )a?acity &CreementsF and tBe &??licaility o> AoS )lasses

T?is #%use ddresses t?e topi# o net7or: trnser #p#ity ,t?e ee#ti&e "it rte de%i&ered to %o7o&er time inter&% nd its re%tions?ip to t?e p#:et trnser +u%ity o Ser&i#e ,+oS prmetersdeined in Re#ommendtion 8.1590 nd o"ormance oEecti!es

T?is #%use dis#usses o"

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sso#ited Fener% notes. A%% &%ues in T"%e 1 re pro&ision% nd t?ey need not "e met unti% t?ey rere&ised ,up or do7n "sed on re% opertion% e*perien#e.

#1 6eneral discussion o> AoS

T?e +oS #%ss deinitions in T"%e 1 present "ounds on t?e end-to-end net7or: perormn#e. As %onFs t?e users ,nd indi&idu% net7or:s do not e*#eed t?e Freed #p#ity spe#ii#tion or tri#

#ontr#t nd pt? is &i%"%e ,s deined in 8.1590 net7or: pro&iders s?ou%d #o%%"orti&e%ysupport t?ese end-to-end "ounds or t?e %ietime o t?e %o7.

T?e #tu% +oS oered to Fi&en %o7 7i%% depend on t?e distn#e nd #omp%e*ity o t?e pt?tr&ersed. t 7i%% oten "e "etter t?n t?e "ounds in#%uded 7it? t?e +oS #%ss deinitions in T"%e 1.

Stti# +oS #%ss Freements #n "e imp%emented "y sso#itinF p#:et mr:inFs ,e.F. Type oSer&i#e pre#eden#e "its or $i-Ser& Code ;oint 7it? spe#ii# #%ss.

;roto#o%s to support dynmi# +oS reJuests "et7een users nd net7or: pro&iders nd "et7eennet7or: pro&iders re under study. ?en t?ese proto#o%s nd supportinF systems re imp%ementedusers or net7or:s my reJuest nd re#ei&e dierent +oS #%sses on %o7-"y-%o7 "sis. n t?iss?ion t?e distin#t perormn#e needs o dierent ser&i#es nd pp%i#tions #n "e #ommuni#tede&%uted nd #:no7%edFed ,or reerence PatB >or %nd-to-%nd AoS

E#? p#:et in %o7 o%%o7s spe#ii# pt?. Any %o7 ,7it? one or more p#:ets on pt? t?tstisies t?e perormn#e o"

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T?e Customer nst%%tion in#%udes %% Termin% EJuipment ,TE su#? s ?ost nd ny router or4A6 i present. T?ere 7i%% "e on%y one ?umn ser in some pp%i#tions. Spe#ii#tions or TE ndt?e ser-to-ser Conne#tion re "eyond t?e s#ope o t?is Re#ommendtion. T?e Fte7ys t?t#onne#t 7it? termin% eJuipment my %so "e #%%ed A##ess Gte7ys.

Reeren#e ;t?s ?&e t?e o%%o7inF ttri"utes

1. ; #%ouds my support ser-to-ser #onne#tions ser-to-ost #onne#tions nd ot?er endpoint&ritions.

2. 6et7or: Se#tions my "e represented s #%ouds 7it? Gte7y routers on t?eir edFes nd somenum"er o interior routers 7it? &rious ro%es.

3. T?e num"er o 6et7or: Se#tions in Fi&en pt? my depend upon t?e C%ss o Ser&i#e oered%onF 7it? t?e #omp%e*ity nd FeoFrp?i# spn o e#? 6et7or: Se#tion.

9. T?e s#ope o t?is Re#ommendtion %%o7s one or more 6et7or: Se#tions in pt?.

5. T?e 6et7or: Se#tions supportinF t?e p#:ets in %o7 my #?nFe durinF its %ie.

. ; #onne#ti&ity spns interntion% "oundries "ut does not o%%o7 #ir#uit s7it#?ed #on&entions

,e.F. t?ere my not "e identii"%e Fte7ys t n interntion% "oundry i t?e sme net7or:se#tion is used on "ot? sides o t?e "oundry.

#" AoS classes

T?is su"#%use des#ri"es t?e #urrent%y deined +oS #%sses. E#? +oS #%ss #retes spe#ii##om"intion o "ounds on t?e perormn#e &%ues. T?is su"#%use in#%udes Fuidn#e s to 7?en e#?+oS #%ss miF?t "e used "ut it does not mndte t?e use o ny prti#u%r +oS #%ss in ny prti#u%r#onte*t.

#"#1 Nature o> tBe net@or= ?er>ormance oEecti!es

T?e o"

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Sui#ient%y %onF to in#%ude enouF? p#:ets o t?e desired %o7 7it? respe#t to t?e rtios ndJunti%es spe#iied.

Sui#ient%y %onF to re%e#t period o typi#% usFe ,%o7 %ietime or user e&%ution.

Sui#ient%y s?ort to ensure "%n#e o ##ept"%e perormn#e t?rouF?out e#? inter&%,inter&%s o poor perormn#e s?ou%d "e identiied not o"s#ured 7it?in &ery %onF e&%ution

inter&%.

Sui#ient%y s?ort to ddress t?e pr#ti#% spe#ts o mesurement.

Bor te%ep?ony minimum inter&% on t?e order o 10 to 20 se#onds is needed 7it? typi#% p#:etrtes ,50 to 100 p#:ets per se#ond nd inter&%s s?ou%d ?&e n upper %imit on t?e order ominutes. A &%ue o 1 minute is pro&ision%%y suFFested nd in ny #se t?e &%ue used must "ereported %onF 7it? ny ssumptions nd #oniden#e inter&%s. )inim%%y ##ept"%e estimtionmet?odo%oFies re intended or uture re&isions o t?is Re#ommendtion. )et?ods to &eriy#?ie&ement o t?e o"or %!aluation

;#:et siMe in%uen#es t?e resu%ts or most perormn#e prmeters. A rnFe o p#:et siMes my "epproprite sin#e mny %o7s ?&e #onsider"%e siMe &rition. o7e&er e&%ution is simp%iied 7it? sinF%e p#:et siMe 7?en e&%utinF ;$H or 7?en t?e ssessment trFets %o7s t?t support#onstnt "it rte sour#es nd t?ereore i*ed inormtion ie%d siMe is re#ommended. normtionie%ds o eit?er 10 o#tets or 1500 o#tets re suFFested nd t?e ie%d siMe used must "e reported.A%so n inormtion ie%d o 1500 o#tets is re#ommended or perormn#e estimtion o ;

prmeters 7?en usinF %o7er %yer tests su#? s "it error mesurements.

#"#4 Uns?eci>ied HUnounded ?er>ormance

Bor some +oS #%sses t?e &%ue or some perormn#e prmeters is desiFnted PP. n t?ese #sest?e T-T sets no o"

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T"%e 1/8.1591

Pro!isional IP AoS class de>initions and net@or= ?er>ormance oEecti!es

AoS )lasses

6et7or:;erormn#e;rmeter

Nature o>Net@or=

Per>ormance.Eecti!e

)lass 0 )lass 1

)lass 2 )lass " )lass 4 )lass

Un-s?eci>ied

IPTD pper "ound ont?e men ;T$

,6ote 1

100ms 900ms 100ms 900ms 1 s

IPD3 pper "ound ont?e 1-10-3Junti%eo ;T$ minus

t?e minimum;T$ ,6ote 2

50ms,6ote

3

50ms,6ote 3

IP9( pper "ound ont?e p#:et %oss

pro""i%ity

110-3

,6ote9

110-3

,6ote 9110-3 110-3 110-3

IP%( pper "ound 110-9,6ote 5

Gener% 6otes

T?e o"

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6ote 9 ( T?e C%ss 0 nd 1 o"

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Tale 2J#141

6uidance >or IP AoS classes

+oSC%ss

App%i#tions ,E*mp%es 6ode )e#?nisms 6et7or: Te#?niJues

0 Re%-Time Qittersensiti&e ?iF?inter#tion,Ho; HTC Seprte +ueue 7it?

preerenti% ser&i#inFTri# FroominF

Constrined RoutinF nd$istn#e

1 Re%-Time Qittersensiti&e inter#ti&e,Ho; HTC.

4ess #onstrinedRoutinF nd $istn#es

2 Trns#tion $tiF?%y nter#ti&e,SiFn%inF Seprte +ueue $rop

priority

Constrined RoutinF nd$istn#e

3 Trns#tion $t

nter#ti&e

4ess #onstrined

RoutinF nd $istn#es

9 4o7 4oss n%y ,S?ortTrns#tions =u%:$t Hideo StreminF

4onF +ueue $roppriority

Any route/pt?

5 Trdition% App%i#tionso $eu%t ; 6et7or:s

Seprte +ueue ,%o7estpriority

Any route/pt?

Tri# po%i#inF nd or s?pinF my %so "e pp%ied in net7or: nodes.

$is#ussion o =rod#st +u%ity Te%e&ision trnsport on ; my "e ound in Appendi* I.

8 &!ailaility oEecti!es

T?is se#tion 7i%% in#%ude inormtion "out &i%"i%ity o"

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A;;E6$I

(nformative)

&T/ Net@or= AoS su??ort o> IP AoS

T?is Appendi* presents n n%ysis o mppinF ; perormn#e prmeters on top o t?e AT) +oSC%ss o"

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A;;E6$I

(nformative)

IP Delay 3ariation Parameter De>inition )onsiderations

T?is Appendi* dis#usses #onsidertions or t?e deinition o ;$H nd t?e use o %ternte sttisti#%met?ods or t?e ;$H o"

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;T$minis t?e minimum ;T$ re#orded durinF mesurement inter&%

Se&er% &%ues o ;$H re mesured o&er %rFe time inter&% #omprisinF o se&er% s?ortmesurement inter&%s. T?e D5t?per#enti%e o t?ese ;$H &%ues is e*pe#ted to meet desiredo"

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A;;E6$I

(nformative)

%$am?le 5y?otBetical re>erence ?atBs >or !alidatinC tBe IP ?er>ormance oEecti!es

T?is Appendi* presents t?e ?ypot?eti#% reeren#e pt?s #onsidered in &%idtinF t?e esi"i%ity o t?eend-to-end perormn#e o"

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6ote t?t 1 or more routers re needed to #omp%ete e#? ro%e nd t?e Core pt? i%%ustrted ?s ourrouters in tndem. A pt? t?rouF? 6S #ou%d en#ounter s e7 s 3 routers or s mny s in t?ise*mp%e.

Router #ontri"ution to &rious prmeters my &ry ##ordinF to t?eir ro%e.

Ro%e A&erFe Tot% $e%y

,sum o JueuinF pro#essinF

$e%y Hrition

A##ess Gte7y 10 ms 1 ms

nternet7or:inFGte7y

3 ms 3 ms

$istri"ution 3 ms 3 ms

Core 2 ms 3 ms

6ote nternet7or:inF Gte7ys typi#%%y ?&e perormn#e #?r#teristi#s dierent t?n A##essGte7ys.

ne o t?e :ey pp%i#tions o t?is Re#ommendtion is Hoi#e o&er ; support.

Bor e*mp%e te%ep?ony ypot?eti#% Reeren#e Endpoint ,RE or medi my "e s s?o7n "e%o7.normtion %o7s rom t?e T%:er do7n t?rouF? t?e proto#o% st#: on t?e %et #ross t?e R; ndup t?e proto#o% st#: on t?e riF?t to t?e 4istener ,on%y one sendinF dire#tion is s?o7n.

T%:er 4istener

G.11 #oder G.11 de#oder Appendi* ;#:et 4oss Con#e%ment

RT; 20ms py%od siMe 0 ms Qitter =uer

$; $;

; ;

,%o7er %yers

(oute lenCtB calculation

t?e distn#e-"sed #omponent is proportion% to t?e #tu% terrestri% distn#e p%us proportion%%%o7n#e or typi#% p?ysi#%-route-to-#tu%-distn#e rtio. T?e route %enFt? #%#u%tion used ?ereis "sed on T-T Re#ommendtion G.2 nd on%y or t?e %onF distn#es #onsidered ?ere. $:mist?e ir-route distn#e "et7een t?e t7o );s t?t "ound t?e portion t?en t?e route %enFt? #%#u%tionis

i $:m>1200 R:m=1.25 $:m

T?e "o&e does not pp%y 7?en t?e portion #ontins ste%%ite ?op.

III#2 %,&/P9% )./PUT&TI.NS T. SUPP.(T %ND-%ND )9&SS 0 &ND )9&SS 1 D%9&

PaCe K

T"%e 1 E*mp%es o typi#% de%y #ontri"ution "y router ro%eBiFure 9 E*mp%e ypot?eti#% Reeren#e Endpoint

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)lass , Net@or= Delay )om?utation H,L 0 tBrouCB 4

T?is se#tion #%#u%tes t?e ;T$ or ny pt? portion supportinF +S #%ss I %o7. ?en %o7portion does not #ontin ste%%ite ?op its #omputed ;T$ is ,usinF t?e de%y or opti#% trnsportFi&en in G.119

;T$ ,in mi#rose#onds ,R:m5 U ,6A $A U ,6$ $$ U ,6C $C U ,6 $

n t?is ormu%

R:mrepresents t?e route %enFt? ssumption #omputed "o&e.

,R:m5 is n %%o7n#e or Pdistn#eP 7it?in t?e portion.

6A 6$ 6C nd 6 represent t?e num"er o ; ##ess Fte7y distri"ution #ore ndinternet7or: Fte7y nodes respe#ti&e%y@ #onsistent 7it? t?e net7or: se#tion e*mp%e inBiFure 2.

$A $$ $C nd 6 represent t?e de%y o ; ##ess Fte7y distri"ution #ore ndinternet7or: Fte7y nodes respe#ti&e%y@ #onsistent 7it? or t?e &%ues or C%ss I ,e.F.T"%e 1.

)*imum ;$H my "e #%#u%ted simi%r%y.

As n e*mp%e o t?is #%#u%tion #onsider t?e o%%o7inF R;. T?is pt? #ontins t?e minimumnum"er o ; net7or:s ,t7o nd n internet7or:inF point.

TE TE

6et7or: Se#tion

End-End 6et7or: ,=erer Ser&i#e +S

6on-; 6et 6et7or: Se#tion

Customer nst%%tion Customer nst%%tion

ser-to-ser Conne#tion ,Te%eser&i#e +S

TE AGTermin% EJuip. A##ess G

4A6 4A6

; 6et7or: C%oud

6 6

66et7or: nter#e

AG G G AG

6on-; 6et

G nternet7or: G

BiFure 5 ypot?eti#% Reeren#e ;t? or +oS C%ss 0

nterior router #oniFurtions re not s?o7n in t?e ypot?eti#% Reeren#e ;t? ,R; o BiFure 9.T?e num"er o Core nd $istri"ution routers #n "e ound in T"%e 2.

Assumptions

1. $istn#e used is ppro*imte%y t?e spn "et7een $yton =e#? nd Sett%e ,S $iFon%%onFer t?n 4is"on to )os#o7.

2. A##ess %in:s re T1 #p#ity ot?ers re %rFer t?n T1 ,e.F. C-3.

3. 4rFest ;#:et SiMe is 1500 "ytes nd Ho; p#:et siMe is 200 "ytes.

9. 6on-; net7or:s re needed "et7een t?e 6 nd A##ess G.

PaCe :

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%lement &!e IPTD /a$IPD3

$istn#e 900 :m

Route 50.5 :m 25

nsertion Time 200 "ytes 1 1500 "ytes ms

6on ; 6et 1 15 0

; 6et 1 6 ;T$ e#? Hr e#?

A##ess 6A 1 10 10 1 1

$istri"ution 6$ 1 3 3 3 3

Core 6C 2 2 9 3

nternet7or: G 6 1 3 3 3 3

; 6et 2 6 ;T$ e#? Hr e#?

A##ess 6A 1 10 10 1 1

$istri"ution 6$ 1 3 3 3 3

Core 6C 9 2 3 12

nternet7or: G 6 1 3 3 3 3

6on ; 6et 2 15 0

TotalF ms 100 82

T"%e 2 Fi&es t?e R; #oniFurtion in terms o num"er nd type o routers distn#e nd#ontri"ution o %% R; #omponents to de%y ,;T$ nd de%y &rition ,;$H. 6ote t?t t?e#%#u%tion o )*imum ;$H ?ere is &ery pessimisti# ,ssuminF 7orst #se ddition o e#? nodend is t?ereore Freter t?n t?e spe#ii#tion o ;$H in t?e "ody o t?is Re#ommendtion.

A R; 7it? 12000 :m ir distn#e "et7een sour#e nd destintion ,eJui&%ent to #ontinent% .S.diFon% distn#e #n produ#e &erFe ;T$ o 150 ms "ut t?e ;$H on t?is pt? 7i%% not #?nFe.

sinF t?e ypot?eti#% Reeren#e Endpoint in BiFure 9 endpoint de%y is s "e%o7.

$e%y ms 6otes

PaCe 10

T"%e 2 An%ysis o E*mp%e C%ss 0 ;t?T"%e 3 Endpoint $e%y An%ysis

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;#:et Bormtion 90 2 times rme siMe p%us 0 %oo:-?ed

Qitter =uer &e. 30 #enter o 0ms "uer

;#:et 4oss Con#e%. 10 one ;4C PrmeP

Tot% ms 0

T?e tot% &erFe de%y or t?e 900 :m user-to-user pt? is 100U0O10 ms resu%tinF in nppro*imte R-&%ue o ,ssuminF t?t ;4RV10-3 ?s Mero impirment #tor 7it? G.11

Appendi* #on#e%ment. T?e R; supports t?e iF? spee#? Ju%ity #teFory o G.10D ,D0WR0eJu% to t?e trnsmission Ju%ity R-#tor reJuirement in t?e T;6 Gurnteed ,iF? spee#?+oS C%ss. G.1 i%%ustrtes t?e trdeo "et7een spee#? #ode# impirments nd de%y. sinF t?e

12000:m R; 7it? ;T$ o 150 ms n ppro*imte R-&%ue o 3 is possi"%e under t?e smessumptions.

A 50ms Customer nst%%tion ,1-7y send nd re#ei&e is possi"%e 7it? p#:et ormtion time o 10ms nd 50 ms de-

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; 6et 1 6 ;$T e#? Hr e#?

A##ess 6A 1 10 10 1 1

$istri"ution 6$ 1 3 3 3 3

Core 6C 2 2 9 3

nternet7or: G 6 1 3 3 3 3

; 6et 2 6 ;$T e#? Hr e#?

$istri"ution 6$ 2 3 3

Core 6C 9 2 3 12

nternet7or: G 6 2 3 3

; 6et 3 6 ;$T e#? Hr e#?

A##ess 6A 1 10 10 1 1

$istri"ution 6$ 1 3 3 3 3

Core 6C 9 2 3 12

nternet7or: G 6 1 3 3 3 3

6on ; 6et 2 15 0

TotalF ms 2"" K8

T"%e 9 Fi&es t?e R; #oniFurtion in terms o num"er nd type o routers distn#e nd#ontri"ution o %% R; #omponents to de%y ,;T$ nd de%y &rition ,;$H.

III#4 %,&/P9% )./PUT&TI.NS T. SUPP.(T %ND-%ND )9&SS 4 D%9&

Bo%%o7inF t?e orm o t?e #%#u%tion "o&e 7e #n e*pnd t?e num"er o 6S ?&inF de%y#ontri"utions Fi&en in T"%e 1/ or 7e #n e*pnd t?e #ontri"utions s o%%o7s

Ro%e A&erFe Tot% $e%y

,sum o JueuinF pro#essinF

A##ess Gte7y 200 ms

nternet7or:inFGte7y

9 ms

$istri"ution 9 ms

Core 3 ms

PaCe 12

T"%e 5 C%ss 9 $e%y #ontri"ution "y router ro%e

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ere 7it? route %enFt? o 2500 :m t?e &erFe 1-7y de%y 7ou%d "e 9 ms ,usinF t?e R;7it? node #oniFurtion s des#ri"ed in T"%e 2/.

III# 9.&DIN6 WIT5IN T5% 5(P

T?e r#tion o e#? trnsmission %in: o##upied "y #ti&e p#:ets is one o t?e #tors to "e

#onsidered in t?e R;s. T?e %od %e&e%s t 7?i#? t?e net7or: 7i%% #ontinuous%y operte is not?er#tor.

III#8 6%.ST&TI.N&( S&T%99IT%S WIT5IN T5% 5(P

T?e use o Feo-sttionry ste%%ites 7s #onsidered durinF t?e study o t?e R;s. A sinF%e Feo-sttionry ste%%ite #n "e used 7it?in t?e R;s nd sti%% #?ie&e end-to-end o"

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%$am?le )alculations o> IP Pac=et Delay 3ariation

T?is ppendi* pro&ides mteri% to #i%itte t?e #%#u%tion o t?e ; p#:et de%y &rition ,;$H or t?ose; +oS #%sses 7?ere rt?er stri#t &%ue or t?e ;$H is spe#iied i.e. ; +oS #%ss 0 nd #%ss 1.

Bor t?e #%#u%tions ?ere it is ssumed t?t net7or: opertor pro&ides #?oi#e o dierent ; +oS #%sses%so in#%udinF +oS #%sses or 7?i#? no ;$H o"

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t?is #omponent in t?e p#:et de%y &rition. T?e i*ed ser&i#e time is determined "y t?e ssumed i*ed p#:et

siMe ,1500 "yte nd t?e router\s output %in: rte e.F. 0.13 s on n ST)-1 %in:.

Bor t?e FFreFtion o t?is de%y #omponent o&er se&er% routers in tndem t?e #on&o%ution o t?e re%e&ntde%y distri"utions is to "e used t:inF into ##ount dierent output %in: rtes 7?en pp%i#"%e. T?e %o7erJunti%e is ssumed to "e Mero t?e ?iF?er ,1-10-3 Junti%e #n "e ppro*imted ##urte%y usinF %rFede&itions t?eory in prti#u%r t?e =?dur-Ro estimte s 7or:ed out in KB;L.

BiFure H.1 i%%ustrtes t?e resu%t o su#? #%#u%tions. t s?o7s t?e ,1-10-3 de%y &rition Junti%e or t?eFFreFted de%y #omponent due to intereren#e rom &rition-sensiti&e tri# or dierent %od %e&e%s o&rition-sensiti&e tri# nd or dierent num"ers o router ?ops in tndem.

&1-1!-2* 30anti%e of 30e0in( de%a+ &a%% %inks T-1*

1 '

8 '

; '

- '

, '

'

10 '

1+, '

10

80

;0

-0

,0

0

0

90

0

100

0 , 10 1, 80 8, ;0

N0mber of ,o's

1ink%oadofde%a+-s

ensitivef%ows567

BiFure H.1/8.1591. T?e ,1-10-3 Junti%e o t?e FFreFted JueuinF de%y #omponent due to &rition-sensiti&e tri# or dierent %e&e%s o t?e &rition-sensiti&e tri# nd or dierent num"er o router ?opsin tndem.

BiFure H.1 ssumes t?t %% %in:s in t?e net7or: re ST)-1 nd %% %in:s s?o7inF t?e sme %od %e&e% or&rition-sensiti&e tri#. one or more %in:s ?&e ?iF?er #p#ity t?n ST)-1 t?e resu%tinF end-to-endde%y 7i%% "e %o7er@ i some %in:s ?&e %o7er #p#ity t?e resu%tinF end-to-end de%y 7i%% "e ?iF?er. T?eseee#ts #n "e #%#u%ted ,see H.2.9 "ut #nnot "e esi%y re%e#ted in BiFure H.1.

Bin%%y it is ssumed t?t in net7or: 7?i#? supports "ot? &rition-sensiti&e nd &rition-insensiti&e tri#t?e %od o &rition-sensiti&e tri# on %in: is not more t?n 50N o t?e %in: to re%e#t t?e o"ser&ed trendto7rds [more dt t?n &oi#e\. T?en rom BiFure H.1 it #n "e deri&ed t?t t?is de%y #omponent #ontri"utes

no more t?n "out 2.9 ms to t?e ;$H on t?e pt? e&en i t?e pt#? #rosses &ery ?iF? num"er o 25ST)-1 router ?ops.

I3#2#" Delay !ariation due to a !ariation-insensiti!e ?ac=et

An rri&inF &rition-sensiti&e p#:et does not pre-empt t?e ser&i#inF o n &rition-insensiti&e p#:et 7?i#?rri&ed er%ier. ConseJuent%y t?e &rition-sensiti&e p#:et my e*perien#e JueuinF #omponent in e#? router

"ounded "y t?e time it t:es to ser&e &rition-insensiti&e p#:et.

Bor t?e #%#u%tion it is ssumed t?t e#? &rition-sensiti&e p#:et e*perien#es rndom de%y due to &rition-insensiti&e p#:et 7?i#? is uniorm%y distri"uted "et7een Mero nd t?e ser&i#e time o m*imum siMed,1500 "yte &rition-insensiti&e p#:et on t?e re%e&nt output %in: rte. n n ST)-1 output %in: t?is

#orresponds to uniorm%y distri"uted de%y "et7een 0 nd 0.13 s in e#? router.

Bor t?e FFreFtion o t?is de%y #omponent o&er se&er% routers in tndem t?e #on&o%ution o t?e re%e&ntde%y distri"utions my "e used t:inF into ##ount dierent output %in: rtes 7?en pp%i#"%e. T?e %o7erJunti%e is ssumed to "e Mero t?e ?iF?er ,1-10-3 Junti%e #n "e #%#u%ted e*#t%y. n most #ses Food

PaCe 2

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ppro*imtion is #?ie&ed "y usinF n ppro*imtion "y norm% ,Gussin distri"ution or t?e 7orst #se

7?i#?e&er yie%ds t?e sm%%est &%ue. T?e ,1-10-3 Junti%e is ound t ,U 3.2.

I3#2#4 &CCreCated delay !ariation >or !ariation-sensiti!e ?ac=ets

An upper "ound to t?e ;$H on R; is ound "y ddinF t?e &%ues #%#u%ted or e#? o t?e t?ree#omponents in H.2.1 to H.2.3.

6ote T?e t?us #%#u%ted &%ue is e*pe#ted to "e ?iF?er t?n t?e &%ue e*perien#ed in re% net7or:. T?eo%%o7inF #tors re noted.

T?e ddition o t?ree Junti%e &%ues yie%ds ?iF?er &%ue t?n t?e #tu% de%y Junti%e.

T?e #tu% siMe o &rition-sensiti&e p#:ets ,su#? s Ho; p#:ets is e*pe#ted to "e mu#? sm%%er t?nt?e ssumed siMe o 1500 "yte. n ddition t?e %od 7it? &rition-sensiti&e tri# on most %in:s ise*pe#ted to "e sm%%er t?n t?e ssumed &%ue o 50N. T?ereore t?e #tu% JueuinF de%y due tointereren#e 7it? &rition-sensiti&e tri# is e*pe#ted to "e sm%%er t?n #%#u%ted.

T?e #tu% distri"ution o &rition-insensiti&e p#:ets ,e.F. TC; #:s %so #ontins p#:et 7?i#? re,mu#? sm%%er t?n t?e ssumed siMe o 1500 "yte. n ddition t?e tot% %od ,&rition-sensiti&e p%us&rition-insensiti&e tri# on most %in:s is e*pe#ted to "e usu%%y sm%%er t?n t?e ssumed &%ue o

100N. T?ereore t?e #tu% JueuinF de%y due to intereren#e 7it? &rition-insensiti&e tri# ise*pe#ted to "e sm%%er t?n #%#u%ted.

I3#" )alculation e$am?les

T?e o%%o7inF s?o7s t?ree e*mp%es or t?e #%#u%tion o t?e ;$H indu#ed on user-to-user R; ,seeBiFure 1.

An e*mp%e 7?ere %% %in:s re re%ti&e%y ?iF? speed ,ST)-1 or ?iF?er.

An e*mp%e 7?ere t?e %in:s "et7een #ustomer nd net7or: nd t?e %in:s "et7een net7or: se#tions ?&e %o7er speed ,E3 or T3.

An e*mp%e 7?ere t?e %in:s "et7een #ustomer nd net7or: re %o7 speed ,e.F. 1.599 )"it/s T1.

I3#"#1 %$am?le @itB ST/-1 lin=s

n t?is e*mp%e %% %in:s re ssumed to "e ST)-1. T?e R; "et7een t?e net7or: inter#es o t?e ; net7or:#%oud ,see Appendi* BiFure 9 #onsists in 12 router ?ops. T?us t?e #ontri"utinF #tors to t?e ;$H on t?is

pt? #n "e #%#u%ted s o%%o7s.

Router %oo:-up de%y &rition ,see H.2.1 12 30 s O 0.3 ms.

+ueuinF de%y &rition due to &rition-sensiti&e tri# ,see BiFure H.1 or 50N %od nd 12 ?opsST)-1 1.3 ms.

+ueuinF de%y &rition due to &rition-insensiti&e tri# ,see H.2.3 D.01 0.13 s O 0.2 ms.

T?us t?e ;$H on t?is ?iF? %in: rte pt? #n "e e*pe#ted to "e sm%%er t?n 2#44 ms.

I3#"#2 %$am?le @itB %" interconnectinC lin=s

n t?is e*mp%e %% %in:s re ssumed to "e ST)-1 e*#ept t?e user-net7or: %in:s nd t?e %in: "et7een net7or:se#tions 7?i#? re ssumed to "e E3 ,39 )"it/s. T?e R; "et7een t?e net7or: inter#es o t?e ; net7or:#%oud ,see Appendi* BiFure 9 #onsists in 12 router ?ops o 7?i#? 2 ?ops ?&e t?e %o7er E3 "it rte. T?ust?e #ontri"utinF #tors to t?e ;$H on t?is pt? #n "e #%#u%ted s o%%o7s.

Router %oo:-up de%y &rition ,see H.2.1 12 30 s O 0.3 ms.

+ueuinF de%y &rition due to &rition-sensiti&e tri# ,or 50N %od nd 10 ?ops ST)-1 p%us 2 ?opsE3

2.D2 ms.

+ueuinF de%y &rition due to &rition-insensiti&e tri# ,or 10 ?ops ST)-1 p%us 2 ?ops E31.1D ms.

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T?us t?e ;$H on t?is mi*ed %in: rte pt? #n "e e*pe#ted to "e sm%%er t?n 4#4; ms.

I3#"#" %$am?le @itB lo@ rate access lin=s

n t?is e*mp%e %% %in:s re ssumed to "e ST)-1 e*#ept t?e user-net7or: %in:s 7?i#? re ssumed to "e "out1.5 )"it/s T1. T?e R; "et7een t?e net7or: inter#es o t?e ; net7or: #%oud ,see Appendi* BiFure 9#onsists in 12 router ?ops o 7?i#? 1 ?op ?s t?e %o7er "it rte. n t?is #se t?e ##ess %in: #ontri"ution is

treted seprte%y. T?e #ontri"utinF #tors to t?e ;$H on t?e ?iF? rte prt o t?is pt? #n "e #%#u%ted so%%o7s.

Router %oo:-up de%y &rition ,see H.2.1 12 30 s O 0.3 ms.

+ueuinF de%y &rition due to &rition-sensiti&e tri# ,or 50N %od nd 11 ?ops ST)-1 1.2D ms.

+ueuinF de%y &rition due to &rition-insensiti&e tri# ,or 11 ?ops ST)-1.39 0.13 s O 0.. ms.

T?us t?e ;$H on t?is ?iF? %in: #ore pt? #n "e e*pe#ted to "e sm%%er t?n 2#"2 ms.

n t?e ##ess %in:s t?e de%y #ontri"ution due to intereren#e 7it? &rition-insensiti&e p#:et my "e smu#? s 15. ms 7?en t7o 1500 "yte p#:ets re ser&ed ?ed o &rition-sensiti&e p#:et ,one o t?ese

p#:ets my "e prt o t?e de%y sensiti&e %o7. T?e #ontri"ution to t?e ;$H due to intereren#e 7it? ot?er&rition-sensiti&e %o7s ?iF?%y depends on t?e num"er o t?ese %o7s nd on t?e #tu% p#:et siMes used.

6ote t?t t?e num"er o &rition-sensiti&e %o7s nd t?e re%ted p#:et siMe on t?e %o7 rte ##ess %in: isdetermined "y pp%i#tions se%e#ted "y t?e end-users. it?out some in%uen#e t?e net7or: opertor 7i%% ind?imse% in dii#u%t position to #ommit to strinFent &%ue or t?e ;$H net7or: perormn#e o"

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(nformative)

/aterial rele!ant to IP ?er>ormance measurement metBods

T?is ppendi* 7?i#? is or urt?er study 7i%% des#ri"e importnt issues to #onsider s ; perormn#emesurement met?ods re de&e%oped. t 7i%% des#ri"e t?e ee#ts o #onditions e*tern% to t?e se#tionsunder test in#%udinF tri# #onsidertions on mesured perormn#e.

T?e o%%o7inF #onditions s?ou%d "e spe#iied nd #ontro%%ed durinF ; perormn#e mesurements

1 t?e e*#t se#tions "einF mesured

SRC nd $ST or end-to-end mesurements

); "oundinF n 6SE "einF mesured6ote it is not ne#essry to mesure "et7een %% ); pirs or %% SRC nd $ST pirs in

order to #?r#teriMe perormn#e2 mesurement time

?o7 %onF smp%es 7ere #o%%e#ted

7?en t?e mesurement o##urred

3 e*#t tri# #?r#teristi#s

rte t 7?i#? t?e SRC is oerinF tri#

SRC tri# pttern

#ompetinF tri# t t?e SRC nd $ST

; p#:et siMe

9 type o mesurement

in-ser&i#e or out-o-ser&i#e

#ti&e or pssi&e

5 summries o t?e mesured dt

mens 7orst-#se empiri#% Junti%es

summriMinF period

s?ort period ,e.F. one minute

%onF period ,e.F. one ?our one dy one 7ee: one mont?

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(nformative)

&??licaility o> tBe I%T Di>>erentiated Ser!ices to IP AoS classes

T?is ppendi* ddresses t?e pp%i#"i%ity o $ierentited Ser&i#es s deined "y t?e ETB tosupportinF t?e deined ; +oS #%sses. 6o +oS o"

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(nformative)

(elationsBi?s amonC transit delay oEecti!es

T?is ppendi* e*p%ins ?o7 t?e %onF-stndinF Fuidn#e on trnsmission de%y pro&ided "yRe#ommendtion G.119 re%tes to t?e p#:et trnser de%y o"

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(nformative)

'ilioCra?By

RBC ,ST$- - User "ata#ram ,rotoco% (U",)

RBC D2 ,ST$-5 -nternet -ontro% essa#e ,rotoco% (-,)

RBC D3 ,ST$- - /ransmission -ontro% ,rotoco% (/-,)

RBC D1D ,ST$-5 -3roadcastin# nternet data#rams

RBC D22 ,ST$-5 -3roadcastin# nternet data#rams in the presence of subnets

RBC D5D ,ST$-D -4i%e /ransfer ,rotoco% (4/,)

RBC D50 -nternet *tandard *ubnettin# ,rocedure,updtes RBC D2

RBC 1305 -Network /ime ,rotoco% (v)

RBC1 -epresentation of , outin# ,o%icies in a outin# e#istr!

RBC 112 -e$uirements for , ersion outers

RBC 201 - /-, se%ective acknow%ed#ment options

RBC 2330 -4ramework for , performance metrics

RBC 299 -"efinition of the "ifferentiated *ervices 4ie%d ("* 4ie%d) in the ,v and ,v6 7eaders

RBC 295 -0n 0rchitecture for "ifferentiated *ervices

RBC 25D -0ssured 4orwardin# ,73 +roup

RBC 25D -0n &8pedited 4orwardin# ,73

RBC 2D -0 Onewa! "e%a! etric for ,,

RBC 20 -0 Onewa! ,acket 9oss etric for ,,

RBC 21 -0 oundtrip "e%a! etric for ,,

RBC 30 - "efinition of "ifferentiated *ervices ,er "omain 3ehaviors and u%es for their*pecification

T;6 TR 101 32D - ;rt 2 :ua%it! of *ervice (:o*) -%asses

Study Group 12 $e%yed Contri"ution $.15 /he effect of ,acket 9osses on *peech :ua%it!'C. Zr%sson Te%i

A= Be" 2001.

T1 Stndrd T1.522-2000 :ua%it! of *ervice for 3usiness u%timedia -onferencin#.

KB;L )i#?e% )nd

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Discussion o> 'roadcast Auality DiCital 3ideo on IP Net@or=s

&ditor>s Note< T?e te*t o t?is se#tion is to e ?ro!ided %t?ouF? it 7i%% pro""%y "eFin s o%%o7s

T?e C%sses in T"%e 1/8.1591 re intended to #o&er "rod rnFe o pp%i#tions or 7?i#? t?etrnsport reJuirements re :no7n. E*mp%es o pp%i#tions not #o&ered "y t?ese #%sses re

"rod#st TH distri"ution proFrm udio $iFit% Cinem nd #ompressed $TH trnsport 7?ere&ery %o7 %oss my "e needed nd possi"%y %o7 net7or: de%y.

At t?e time o pu"%i#tion more study is needed to deine p#:et trnser perormn#e reJuirementsor diFit% &ideo trnsport t &ery ?iF? trnsport rtes usinF pp%i#tions 7it? %o7 to%ern#e toimpirments or n e*treme%y demndinF #ommunity o users.

end o $rt Re#ommendtion 8.1591