QImp752199912I.docx
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QImp752199912I.docx
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QImp752199912I
INTERNATIONALTELECOMMUNICATIONUNION
TELECOMMUNICATION
STANDARDIZATIONSECTOR
STUDYPERIOD1997-2000
COM11-R208-E
February2000
Original:
English
Question:
2/11
E
STUDYGROUP11-REPORTR208
SOURCE*:
STUDYGROUP11
TITLE:
IMPLEMENTORS'GUIDE(12/99)FORRECOMMENDATIONQ.752(06/97)
________
Summary
ThisdocumentcontainstheMTPandSCCPscreeningmeasurements,andSAALandMTP-3bmeasurementstobeaddedtoQ.752whenthatisrepublished.TwonewSCCPmeasurementsareincluded.Thisdocumentalsocontainssomeeditorialcorrectionsto,andclarificationsof,the06/97version.
Attention:
ThisisnotanITUpublicationmadeavailabletothepublic,butaninternalITUDocumentintendedonlyforusebytheMemberStatesoftheITUandbyitsSectorMembersandtheirrespectivestaffandcollaboratorsintheirITUrelatedwork.Itshallnotbemadeavailableto,andusedby,anyotherpersonsorentitieswithoutthepriorwrittenconsentoftheITU.
1Introduction
1.1References
[1]ITU-TRecommendationQ.752(06/97);MonitoringandmeasurementsforSignallingSystemNo.7networks.
1.2Background
Thisguideisacompilationofreporteddefects,theirresolutionsandminorupgradestothe1997editionofITU-TRecommendationQ.752.ItincludesallapprovedcorrigendaandisintendedtobeanadditionalauthoritativesourceofinformationforimplementorstobereadinconjunctionwiththeRecommendationitself.
1.3Scopeoftheguide
Thisguiderecordstheresolutionsofdefectsinthefollowingcategories:
•editorialerrors;
•technicalerrors,suchasomissions,inconsistencies,etc.;and
•ambiguities.
Inaddition,thisguiderecordsminorenhancementstotheRecommendationinthefollowingcategories:
•increasedinteroperability;and
•deploymentpossibilityinnewenvironments.
1.4Contacts
RapporteurQ.2/11:
ClemensSuerbaum
SiemensAG
OENSNESC12
Machtlfingerstr1
D-81359Munich
Germany
Tel:
+498972242418
Fax:
+498972224159
E-mail:
clemens.suerbaum@oen.siemens.de
1.5Documenthistory
Version
Summary
05/98
NewImplementors'Guide
12/99
Measurements7.22and9.14added
2ChangestoQ.752text
2.1Addanewsubclause2.2.4(category:
minorenhancementfordeploymentpossibilityinnewenvironments):
2.2.4Table1-SAALdefinesthemeasurementsforSAALsignallinglinkfaultsandperformance,andisanalogoustoTable1.
2.2Subclause2.3shouldbereplacedby(categories:
technicalerrorandminorenhancementfordeploymentpossibilityinnewenvironments):
"2.3Table2
2.3.1Item2.1includesthedurationoflinkfailure(alsomeasuredinitems1.2and1.12),thedurationoflinkinhibition(afunctionofitems2.5and2.6),andthedurationofblocking.Remoteblockingismeasuredinitem2.9.Thedurationoflocalblockingisnotincludedasadirectmeasurement,since,iflevel2haslostcontactwithlevel3,itmightnotbepossibleforOMAPtoknowwhetherthelinkhaslocalblockingorhasfailed.
2.3.2Items2.5and2.6couldbederivedfrommorebasicmeasurementswhicharethestartandendofinhibition.
Item2.7couldbederivedfrommeasurements1.2and1.12.
Item2.9couldbederivedfrommeasurements2.10and2.11.
2.3.3Items2.10and2.11(startandendrespectivelyofremoteprocessoroutage)canbeusedtodeduceitem2.9.Theyindicateaproblemanditscessationattheotherendofthelink,thisproblemcouldbeonebetweenlevel2andlevel3.
2.3.4Items2.13and2.14canbederivedfrommeasurements2.16and2.17.
2.3.5Item2.15isa"localbusy"measurement."Localbusy"isdefinedasaperiodinwhich"busy"LinkStatusSignalUnits(LSSUSIB)aretransmitted.TheBlueBookQ.791durationmeasurementisreplacedbyacountofthenumberof LSSUSIBssent.
2.3.6Items2.16to2.19inclusivearebasicmeasurementsfromwhichitems2.5,2.6,2.13and2.14canbededuced.
2.3.7ThistableisalsorelevantforSAAL,exceptthatitems2.9,2.10and2.11donotapply."
2.3Addanewsubclause2.4.11(category:
minorenhancementfordeploymentpossibilityinnewenvironments):
2.4.11Table3isalsorelevantforSAAL.Items3.1,3.2and3.4areacountofMTP-3bPDUoctets,whileitems3.3,3.5,3.10and3.11areacountofMTP-3bPDUs.
2.4Changesubclause2.5.4to:
2.5.4Items4.9and4.10canbederivedfrom4.11and4.12.Theyarenotbasicmeasurements.Theyareobligatoryhoweverininternationalnetworks.Ifrequired,thesemeasurementscouldcontainanindicationwhetherornotthedestinationisadjacent.
2.5Addanewsubclause2.5.8(category:
minorenhancementfordeploymentpossibilityinnewenvironments):
2.5.8Table4isalsorelevantforSAAL.
2.6Changesubclause2.6.2to:
2.6.2Item5.8,transfercontrolledmessage(TFC)received,indicatescongestionintheroutesettowardsthedestinationidentifiedbythe"SP"registrationindex(see3.8.4/Q.704,11.2.3/Q.704,11.2.4/Q.704and11.2.5/Q.704).Forthenationaloptionofmultiplelevelsofcongestion,thecongestionstatusisincluded.ThefirstreportoftheintervalshouldcontaintheidentityofthesignallingpointsendingtheTFC(theOPCoftheTFCsMTPlabel),aswellasthecongesteddestinationidentity,andthecongestionlevelifappropriate.
2.7Addanewsubclause2.6.3(category:
minorenhancementfordeploymentpossibilityinnewenvironments):
2.6.3Table5isalsorelevantforSAAL,exceptthatinitems5.5,5.6and5.7thereferencesto"MSU"shouldbereplacedbyreferencestoMTP-3bPDUs.
2.8Addanewsubclause2.7.4(category:
minorenhancementfordeploymentpossibilityinnewenvironments):
2.7.4Table6isalsorelevantforSAAL.Items6.1through6.6areacountofMTP-3bPDUoctets,whileitem6.7isacountofMTP-3bPDUs.
2.9Changesubclause3.1to:
3.1General
TheSCCPerrorperformanceindicatorsaredetailedinTable7.
Table8detailstheSCCPandsubsystemavailabilityandcongestionindicators.
Table9describestheSCCPutilizationindicators.
Table9bisdescribestheSCCPqualityofservicemeasurements.
Notethatinternalmessages(i.e.thosewhosesourceandsinkareinthesamenode)arealsocounted.
ItemsinthesetableswhichincludeapointcodeforregistrationshouldalsoincludethelocalMTPSAPinstancetoidentifytheMTPnetworkinwhichthepointcodeisvalid.
2.10Addaparagraphattheendofsubclause3.2:
Item7.22indicatesadiscrepancybetweentheSCCPandMTProutingtables.
2.11Subclause5.2containssomeincorrectreferences(categoryeditorialerrors).Thesubclauseshouldbe:
5.2Table13
TCutilizationmeasurementsarelistedinTable13.
5.2.1Item13.6isacountofallnewtransactionsintheinterval,includingthoseclosedimmediatelybyanABORTaftertheopeningBEGIN.
Item13.7isameasurementofthemeannumberofopentransactionsintheinterval.Anopentransactionisonetowhichatransactionidentityhasbeenallocated,andthisidentityisnotyetfrozen.
Measurement13.9(thecumulativemeandurationoftransactions)isthemeandurationforalltransactionsthatbeganbetweenthestartofmeasurementsandtheendofthemeasurementinterval.Itincludesthetimefromopeningthetransactiontotheendoftheinterval,forthosetransactionsthatdidnotcloseduringtheinterval.Here,thetransactiondurationisdefinedasthetimefromallocationofthetransactionidentitytofreezingit.
Seeclause5.2.2formoreinformation.
5.2.2Anexampleofcollectionofmeasurements
Amodeltodescribethecollectionofitems13.7and13.9,usedtoexplainpossiblemeasurementtechniquesbutwhichisnotintendedtospecifyimplementation,isasfollows:
Supposeasystemcollectsmeasurementsinanumbersof"measurementcentres".Ameasurementcentrecanbedefinedasapointinthesystemthatlaunches,orobservesdirectlythelaunchingofaTCtransaction,anditalsoeitherfinishesthetransaction,orobservesdirectlyitspassing.Thispointisassumedalsotobeabletocountthenumberoffree,frozenandthawingtransactionidentitieswithwhichitisconcerned.Thusinamultiprocessorsystem,theremightbeone(ormore)measurementcentre(s)perprocessorperApplicationEntitydefinition,whichisresponsibleforlaunchingallthetransactions(instances)ofthatApplicationEntity.Inorderformeasurementscollectedbyallthecentrestorefertothesameinterval,itisassumedthateachcentrehasaclockwhich"ticks"ataratesufficientlyhightobeabletomeasurewiththerequiredprecision.Theclocksarealsoassumedtobesynchronizedtowithinoneclocktick(iftheywerenot,furthercalculationswouldbeneededtodeterminetheoverallprecision).Ifnecessary,eachcentrewouldhavean"active"setofmeasurements,andanothersettakeninthepreviousmeasurementinterval,whichmightbeawaitingcollection.
Measurement13.7isthemeannumberofopentransactions,estimatedoverameasurementinterval,observationsaretakenateachnewtransactionduringtheinterval.
ThemeasurementscanbeoverthewholeApplicationEntity,orateachcentre,andthenaccumulatedforthewholeApplicationEntity.
DefineacumulativetotalAcofopentransactions(thisissetto0atthestartofeachmeasurementinterval),anddefineaasthenumberofopentransactionsatanytime.aissetto0atsysteminitialization,itisincrementedateachtransactionarrival,anddecrementedwheneachtransactionleaves.Definenasthenumberofnewtransactionsarrivingduringthemeasurementinterval(whichissetto0atthestartofeachinterval).
Whenatransactionarrives,set:
Whenatransactionfinishes,set:
Whenthereportingeventoccursattheendofthemeasurementinterval,reportAc,nanda.TheninitializeAcandnto0.
Themeannumbe
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