SIST EN 301 068-6 V1.1.1:2003
(Main)Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; ATM transfer capability and traffic parameter indication; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network
General Information
- Abstract
Develop part 6 (ATS$PIXIT for the network) of EN 301 068
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
- Mandate
- BC-T-338
Overview
SIST EN 301 068-6 V1.1.1:2003 is a European standard developed by the Slovenski inštitut za standardizacijo (SIST), harmonized with EN 301 068-6 and published as part of the telecommunications standards series. This standard focuses on the Broadband Integrated Services Digital Network (B-ISDN) and the Digital Subscriber Signalling System No. two (DSS2) protocol, with specific reference to Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the network side. The document establishes guidelines for testing conformance to the DSS2 protocol at the ATM (Asynchronous Transfer Mode) interface, ensuring robust interoperability and facilitating the deployment of B-ISDN services.
Key Topics
- Abstract Test Suite (ATS): Specifies standardized test sequences for verifying protocol conformance of network elements implementing DSS2 protocol features related to ATM transfer capability and traffic parameter indication.
- PIXIT (Protocol Implementation eXtra Information for Testing): Provides a template for capturing additional protocol implementation details from vendors to support robust and accurate conformance testing.
- Test Methodology: Emphasizes multi-party and remote test configurations, allowing comprehensive evaluation of DSS2 signalling functions at the user-network interface.
- Reference Interface: Focuses on the TB reference point (or coincident SB and TB reference points as per ITU-T Recommendation I.413), addressing protocol testing for network-side signalling entities.
- Conformance Reporting: Specifies forms and procedures for documenting Protocol Conformance Test Reports (PCTR) and the content required for test laboratories and clients.
Applications
The implementation of SIST EN 301 068-6 V1.1.1:2003 offers practical benefits including:
- Vendor Interoperability: Ensures that network equipment from multiple suppliers can communicate reliably in B-ISDN environments using the DSS2 protocol.
- Network Equipment Verification: Provides testing specifications for manufacturers and service providers deploying B-ISDN infrastructure, supporting quality assurance processes.
- Conformance Assessment: Standardizes the approach for evaluating protocol adherence, facilitating certification and procurement of compliant solutions.
- Test Laboratory Guidance: Assists accredited test labs in preparing and executing abstract test suites tailored for the network interface, including generating the necessary reports and proformas.
- Protocol Evolution: Supports ongoing development and refinement of ISDN and ATM-based broadband protocols by providing clear testing benchmarks.
Related Standards
SIST EN 301 068-6 V1.1.1:2003 is part of a broader family of European and international standards governing B-ISDN and DSS2 protocol testing, including:
- EN 301 068-1: Broadband ISDN; DSS2 protocol specification – the foundational protocol document for which the ATS and PIXIT are developed.
- EN 301 068-2: Protocol Implementation Conformance Statement (PICS) proforma specification.
- EN 301 068-4/5: Additional testing and specification parts for both user and network sides of the TB reference point.
- ISO/IEC 9646 series: International standards for testing methodologies and frameworks, referenced for test suite structuring and execution, including Tree and Tabular Combined Notation (TTCN) for test specification.
- ETSI EN 300 443-1/2: Related standards for B-ISDN signalling and conformance requirements.
By adhering to this standard, organizations help ensure the reliability and efficiency of broadband networks based on Integrated Services Digital Network (ISDN) technology and advance the state of telecommunications interoperability across Europe.
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Frequently Asked Questions
SIST EN 301 068-6 V1.1.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; ATM transfer capability and traffic parameter indication; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network". This standard covers: Develop part 6 (ATS$PIXIT for the network) of EN 301 068
Develop part 6 (ATS$PIXIT for the network) of EN 301 068
SIST EN 301 068-6 V1.1.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 068-6 V1.1.1:2003 is associated with the following European legislation: Standardization Mandates: BC-T-338. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 301 068-6 V1.1.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; ATM transfer capability and traffic parameter indication; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 301 068-6 Version 1.1.1SIST EN 301 068-6 V1.1.1:2003en01-december-2003SIST EN 301 068-6 V1.1.1:2003SLOVENSKI
STANDARD
ETSIEN301068-6V1.1.1(2000-10)EuropeanStandard(Telecommunicationsseries)BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;ATMtransfercapabilityandtrafficparameterindication;Part6:AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetworkSIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)2ReferenceDEN/SPAN-05150-6KeywordsB-ISDN,DSS2,ATM,testing,ATS,PIXIT,networkETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88ImportantnoticeIndividualcopiesofthepresentdocumentcanbedownloadedfrom:http://www.etsi.orgThepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.Usersofthepresentdocumentshouldbeawarethatthedocumentmaybesubjecttorevisionorchangeofstatus.InformationonthecurrentstatusofthisandotherETSIdocumentsisavailableathttp://www.etsi.org/tb/status/Ifyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.1.1Definitionsrelatedtoconformancetesting.73.1.2DefinitionsrelatedtoEN301068-1.73.2Abbreviations.84AbstractTestMethod(ATM).84.1DescriptionofATMused.84.2ConventionsfortestcomponentsandPCOs.95Untestabletestpurposes.106ATStoTPmap.107PCTRconformance.108PIXITconformance.119ATSConformance.11AnnexA(normative):ProtocolConformanceTestReport(PCTR)proforma.12A.1Identificationsummary.12A.1.1Protocolconformancetestreport.12A.1.2IUTidentification.12A.1.3Testingenvironment.12A.1.4Limitsandreservations.13A.1.5Comments.13A.2IUTConformancestatus.13A.3Staticconformancesummary.13A.4Dynamicconformancesummary.14A.5Staticconformancereviewreport.14A.6Testcampaignreport.14A.7Observations.15AnnexB(normative):PartialPIXITproforma.16B.1Identificationsummary.16B.2Abstracttestsuitesummary.16B.3Testlaboratory.16B.4Client(oftheTestLaboratory).17B.5SUT.17B.6Protocolinformation.18B.6.1Protocolidentification.18B.6.2Configurationtobetested.18B.6.3Testmanagementtimers.18B.6.4ParameterValues.19SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)4AnnexC(normative):AbstractTestSuite(ATS).20C.1TheTTCNGraphicalform(TTCN.GR).20C.2TheTTCNMachineProcessableform(TTCN.MP).20Bibliography.21History.22SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeServicesandProtocolsforAdvancedNetworks(SPAN).Thepresentdocumentispart6ofamulti-partENcoveringtheDigitalSubscriberSignallingSystemNo.2(DSS2)protocolspecificationfortheB-ISDNATMtransfercapabilityandtrafficparameterindication,asdescribedbelow:Part1:"Protocolspecification[ITU-TRecommendationsQ.2961.1(1995),Q.2961.2(1997),Q.2961.3(1997),Q.2961.4(1997),modified]";Part2:"ProtocolImplementationConformanceStatement(PICS)proformaspecification";Part3:"TestSuiteStructureandTestPurposes(TSS&TP)specificationfortheuser";Part4:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuser";Part5:"TSS&TPspecificationforthenetwork";Part6:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetwork".NationaltranspositiondatesDateofadoptionofthisEN:13October2000DateoflatestannouncementofthisEN(doa):31January2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31July2001DateofwithdrawalofanyconflictingNationalStandard(dow):31July2001SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)61ScopeThissixthpartofEN301068specifiesthenetworkAbstractTestSuite(ATS)fortheTBreferencepointorcoincidentSBandTBreferencepoint(asdefinedinITU-TRecommendationI.413[6])ofimplementationsconformingtothestandardsforthesignallinguser-networklayer3specificationforATMtransfercapabilityandtrafficparameterindicationoftheDigitalSubscriberSignallingSystemNo.two(DSS2)protocolforthepan-EuropeanBroadbandIntegratedServicesDigitalNetwork(B-ISDN),EN301068-1[1].AfurtherpartofthepresentdocumentspecifiestheTestSuiteStructureandTestPurposes(TSS&TP)relatedtothisATSandpartialPIXITproforma.OtherpartsspecifytheTSS&TPandtheATSandpartialPIXITproformafortheUsersideoftheTBreferencepointorcoincidentSBandTBreferencepointofimplementationsconformingtoEN301068-1[1].2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETSIEN301068-1:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;ATMtransfercapabilityandtrafficparameterindication;Part1:Protocolspecification[ITU-TRecommendationsQ.2961.1(1995),Q.2961.2(1997),Q.2961.3(1997),Q.2961.4(1997),modified]".[2]ETSIEN301068-2:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;ATMtransfercapabilityandtrafficparameterindication;Part2:ProtocolImplementationConformanceStatement(PICS)proformaspecification".[3]ISO/IEC9646-1:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part1:Generalconcepts".[4]ISO/IEC9646-2:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part2:AbstractTestSuitespecification".[5]ISO/IEC9646-3:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part3:TheTreeandTabularCombinedNotation(TTCN)".[6]ITU-TRecommendationI.413(1993):"B-ISDNuser-networkinterface".[7]ETSIEN300443-1:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;B-ISDNuser-networkinterfacelayer3specificationforbasiccall/bearercontrol;Part1:Protocolspecification[ITU-TRecommendationQ.2931(1995),modified]".[8]ISO/IEC9646-4:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part4:Testrealization".[9]ISO/IEC9646-5:"Informationtechnology;OpenSystemsInterconnection;Conformancetestingmethodologyandframework;Part5:Requirementsontestlaboratoriesandclientsfortheconformanceassessmentprocess".SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)7[10]ETSIETS300443-2:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;B-ISDNuser-networkinterfacelayer3specificationforbasiccall/bearercontrol;Part2:ProtocolImplementationConformanceStatement(PICS)proformaspecification".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply,inadditiontothosegiveninEN301068-1[1]andEN300443-1[7]:3.1.1DefinitionsrelatedtoconformancetestingAbstracttestcase:refertoISO/IEC9646-1[3]AbstractTestMethod(ATM):refertoISO/IEC9646-1[3]AbstractTestSuite(ATS):refertoISO/IEC9646-1[3]ImplementationUnderTest(IUT):refertoISO/IEC9646-1[3]SystemUnderTest(SUT):seeISO/IEC9646-1[3]UpperTester(UT):seeISO/IEC9646-1[3]Lowertester:refertoISO/IEC9646-1[3]ProtocolImplementationConformanceStatement(PICS):refertoISO/IEC9646-1[3]PICSproforma:refertoISO/IEC9646-1[3]ProtocolImplementationeXtraInformationforTesting(PIXIT):refertoISO/IEC9646-1[3]PIXITproforma:refertoISO/IEC9646-1[3]TestPurpose(TP):refertoISO/IEC9646-1[3]PointofControlandObservation(PCO):seeISO/IEC9646-1[3]3.1.2DefinitionsrelatedtoEN301068-1user:DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereaTBreferencepointorcoincidentSBandTBreferencepointappliesuser(SB/TB):DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereacoincidentSBandTBreferencepointappliesuser(TB):DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereaTBreferencepointapplies(userisaprivateISDN)SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)83.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ATMAbstractTestMethodATSAbstractTestSuiteB-ISDNBroadbandIntegratedServicesDigitalNetworkCRCallReferenceDSS2DigitalSubscriberSignallingSystemNo.twoIE_flagInformationelementinstructionindicatorflagIE_AIInformationelementactionindicatorIUTImplementationUnderTestPICSProtocolImplementationConformanceStatementPIXITProtocolImplementationeXtraInformationforTestingTSSTestSuiteStructureExTSExecutableTestSuiteLTLowerTesterMOTMeansOfTestingPCOPointofControlandObservationPDUProtocolDataUnitSUTSystemUnderTestTPTestPurposeTTCNTreeandTabularCombinedNotationUTUpperTesterVCVirtualChannelVCIVirtualChannelIdentifierVPCVirtualPathConnectionVPCIVirtualPathConnectionIdentifierVPVirtualPath4AbstractTestMethod(ATM)4.1DescriptionofATMusedTherequirementfortestingthenetworkIUTistofocusonthebehaviourofthenetworkIUTattheuser-networkinterfacewhereaTBreferencepointorcoincidentSBandTBreferencepointapplies.ThustheIUTisthenetworkDSS2protocolentityataparticularuser-networkinterfaceandisnotthewholenetwork.ItispossibletospecifyanATSbasedonaSingleparty(remote)testmethodforsuchanIUT.However,itisconsideredthatanATSbasedonsuchanapproachisoflimiteduseastheonlywaytospecifyIUTgeneratedPDUsistousethe"implicitsend"statement.ManyusersofsuchanATSwouldreplacethe"implicitsend"statementswithdescriptionsofthebehaviouratotherinterfaces.AnATSbasedonamulti-partytestmethodisconsideredtobemoreusefulinthatitisclosertohowarealtestsuitewouldbeconstructed.Suchatestmethodspecifiesbehaviouratmultiplenetworkinterfaces.Oneveryimportantlimitationhereisthattestsarefocussedononeparticularinterface.ThusthetestsystemismadeuponeMainTestComponent(MTC)andoneormoreParallelTestComponents(PTC),seefigure1.SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)94.2ConventionsfortestcomponentsandPCOsMasterpartSlavepartMTCAPTC1A1(CP)L0(PCO)L1(PCO)IUTNETWORKFigure1:Multi-partytestmethodInamaster/slavearrangement,theMTCisconsideredtobethemasterwhilethePTCsaretheslaves.The"slave"testersareonlyanexplicitdescriptionofhowtodealwiththeremoteinterfacesduringthetestingprocess,i.e."howtomaketheIUTsendtherequiredmessage".Thismeans,inparticular,thattheverdictwillonlybeassignedfromtheprotocolaspectsobservedontheinterfaceundertest(i.e.bythe"master"tester),asitwouldbeobservedbyaterminalconnectedtothisinterface.Afailureinthecorrelationbetweentheprotocolatthedifferentinterfacestowhichthedifferenttestersareconnected,i.e.inthemechanismofthefunctionalserviceitself,willnotcauseaFAILverdict.Forinstance,iftheIUTfailstosendamessageonthetestedinterfaceafteranotherinterfacehasreceivedtheproperstimulus,theverdictwillbeINCONCLUSIVE.TheMTCMTCAhastwofunctionsinthisconfiguration.Firstly,ithastheMTCfunctionofcontrollingtheoneormorePTCs.ThusitisresponsibleforstartingthePTCsandafterwardsco-ordinatesactivitiesbyexchangingCo-ordinationMessages(CM)withthePTCs.SecondlyitisresponsibleforthebehaviouroftheLowerTester(LT)atPCOL0.Acombinationoftheremoteandmulti-partytestmethodsisapplied.Ascanbeseenfromfigure1,severalPCOsareused.AllPCOsresideattheserviceaccesspointsbetweenlayers2and3.SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)10MTCSUTPTC1Layer3Layer2Layer1L0IUTL1Layer3Layer2Layer1ServiceproviderFigure2:Combinationoftheremoteandmulti-partytestmethodsTheMTCPCOisnamed"L0"("L"forLower).TheL0PCOisusedtocontrolandobservethebehaviouroftheIUTandtestcaseverdictsareassigneddependingonthebehaviourobservedatthisPCO.ThePTCsPTC1,PTC2etc.usePCOsL1,L2etc.ThesePCOsareusedtocontroland,inalimitedway,observethebehaviourofthenetworkequipmentatinterfacesotherthantheoneundertest.NoverdictsareassignedatthesePCOs.Asstatedinapreviousparagraph,thenon-receiptofnetworkgeneratedmessagesatL0,whicharestimulatedbyeventsattheL1,L2etc.,willresultinINCONCLUSIVEratherthanFAILverdictsbeingassigned.PTC2isonlyactivatedinthattestcasesthattesttheproceduresattheaccessbetweenarootuserandtheIUT,whenmorethanonepartyisinvolvedinthecallbetweentherootuserandtheIUT.IntestcaseswhichverifythattheIUTrejectsinvalidorunacceptableSETUPmessages,noPTCisactivatedatall,astheserejectionproceduresareconsideredlocaltotheaccessbetweenIUTandMTC.5UntestabletestpurposesTherearenountestabletestpurposesassociatedwiththisATS.6ATStoTPmapTheidentifiersusedfortheTPsarereusedastestcasenames.Thusthereisastraightforwardone-to-onemapping.7PCTRconformanceAtestlaboratory,whenrequestedbyaclienttoproduceaPCTR,isrequired,asspecifiedinISO/IEC9646-5[9],toproduceaPCTRconformantwiththePCTRtemplategiveninannexBofISO/IEC9646-5[9].Furthermore,atestlaboratory,offeringtestingfortheATSspecificationcontainedinannexC,whenrequestedbyaclienttoproduceaPCTR,isrequiredtoproduceaPCTRconformantwiththePCTRproformacontainedinannexAofthepresentdocument.APCTRwhichconformstothisPCTRproformaspecificationshallpreservethecontentandorderingoftheclausescontainedinannexA.ClauseA.6ofthePCTRmaycontainadditionalcolumns.Ifincluded,theseshallbeplacedtotherightoftheexistingcolumns.Textinitalicsmayberetainedbythetestlaboratory.SIST EN 301 068-6 V1.1.1:2003
ETSIETSIEN301068-6V1.1.1(2000-10)118PIXITconformanceAtestrealizer,producinganexecutabletestsuitefortheAbstractTestSuite(ATS)specificationcontainedinannexC,isrequired,asspecifiedinISO/IEC9646-4[8]
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