ETSI EN 301 060-6 V1.1.4 (1999-11)

Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Basic call control; Enhancement at the b service entry point for Virtual Private Network (VPN) applications; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network

DEN/SPS-05109-6

Digitalno omrežje z integriranimi storitvami (ISDN) – Protokol digitalne naročniške signalizacije št. 1 (DSS1) – Krmiljenje osnovnega klica – Izboljšanje v vstopni točki "b" storitve za aplikacije navideznega zasebnega omrežja (VPN) – 6. del: Abstraktni preskušalni niz (ATS) in delna dodatna informacija za preskušanje izvedbe protokola (PIXIT) – Proforma specifikacija za omrežje

General Information

• Status: Published
• Publication Date: 23-Nov-1999
• Technical Committee: SPS 5 3 - Conformance Testing
• Current Stage: 12 - Completion
• Due Date: 26-Nov-1999
• Completion Date: 24-Nov-1999
• Mandate: BC-T-338
• Ref Project: SIST EN 301 060-6 V1.1.4:2005 - Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Basic call control; Enhancement at the b service entry point for Virtual Private Network (VPN) applications; Part 6: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification for the network

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SUHVNXãDQMHIntegrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Basic call control; Enhancement at the b service entry point for Virtual Private Network (VPN) applications; 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 301 060-6 Version 1.1.4SIST EN 301 060-6 V1.1.4:2005en01-januar-2005SIST EN 301 060-6 V1.1.4:2005SLOVENSKI
STANDARD



SIST EN 301 060-6 V1.1.4:2005



ETSIEN301060-6V1.1.4(1999-11)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part6:AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetworkSIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)2ReferenceDEN/SPS-05109-6(9tdi0ieo.PDF)KeywordsATS,ISDN,DSS1,basic,PIXIT,network,VPNETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/[e-mail]ETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:[e-mail]Ideliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshouldbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute1999.Allrightsreserved.SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.1.1Definitionsrelatedtoconformancetesting.73.1.2DefinitionsrelatedtoEN301060-1.83.2Abbreviations.84AbstractTestMethod.94.1DescriptionofATMused.94.2ConventionsfortestcomponentsandPCOs.95Untestabletestpurposes.106ATSconventions.116.1Declarationspart.116.1.1Typedefinitions.116.1.1.1Simpletypedefinitions.116.1.1.2Structuredtypedefinitions.116.1.1.2.1TTCNstructuredtypedefinitions.116.1.1.2.2ASN.1structuredtypedefinitions.116.1.1.3ASPtypedefinitions.116.1.1.3.1TTCNASPtypedefinitions.116.1.1.3.2ASN.1ASPtypedefinitions.126.1.1.4PDUtypedefinitions.126.1.1.4.1TTCNPDUtypedefinitions.126.1.1.4.2ASN.1PDUtypedefinitions.126.1.2Testsuiteconstants.126.1.3Testsuiteparameters.126.1.4Variables.126.1.4.1Testsuitevariables.126.1.4.2Testcasevariables.136.1.5Testsuiteoperationdefinitions.136.2Constraintspart.136.2.1Structuredtypeconstraintdeclaration.136.2.2ASN.1typeconstraintdeclaration.136.2.3ASPtypeconstraintdeclaration.136.2.3.1ASN.1ASPtypeconstraintdeclaration.136.2.3.2TTCNASPtypeconstraintdeclaration.146.2.4PDUtypeconstraintdeclaration.146.2.4.1ASN.1PDUtypeconstraintdeclaration.146.2.4.2TTCNPDUtypeconstraintdeclaration.146.2.4.3Specialcoding.146.2.5Derivedconstraints.146.2.6Parameterizedconstraints.146.2.7Valueassignment.146.2.7.1Specificvalues.146.2.7.2Matchingvalues.156.3Dynamicpart.156.3.1Testcases.156.3.2Teststeps.156.3.3Defaults.15SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)47ATStoTPmap.158PCTRconformance.159PIXITconformance.1610ATSConformance.16AnnexA(normative):ProtocolConformanceTestReport(PCTR)proforma.17A.1Identificationsummary.17A.1.1Protocolconformancetestreport.17A.1.2IUTidentification.17A.1.3Testingenvironment.17A.1.4Limitsandreservations.18A.1.5Comments.18A.2IUTConformancestatus.18A.3Staticconformancesummary.18A.4Dynamicconformancesummary.19A.5Staticconformancereviewreport.19A.6Testcampaignreport.19A.7Observations.32AnnexB(normative):PartialPIXITproforma.33B.1Identificationsummary.33B.2Abstracttestsuitesummary.33B.3Testlaboratory.34B.4Client(oftheTestlaboratory).34B.5SUT.35B.6Protocolinformation.35B.6.1Protocolidentification.35B.6.2Configurationtobetested.36B.6.3Configurationoptions.36B.6.4Testmanagementtimers.37B.6.5SendingofmessagesbyIUT.37B.6.6Parametervalues.38AnnexC(normative):AbstractTestSuite(ATS).40C.1TheTTCNGraphicalform(TTCN.GR).40C.2TheTTCNMachineProcessableform(TTCN.MP).40AnnexD(normative):Void.41AnnexE(informative):GeneralstructureofATS.42AnnexF(informative):"TTCN.MPandTTCN.GR"versionhistory.43Bibliography.44History.45SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeSignallingProtocolandSwitching(SPS).Thepresentdocumentispart6ofamulti-partstandardcoveringtheDigitalSubscriberSignallingSystemNo.one(DSS1)protocolspecificationfortheIntegratedServicesDigitalNetwork(ISDN)Basiccallcontrolextensionsatthe"b"serviceentrypointforVPNapplications,asdescribedbelow:Part1:"Protocolspecification";Part2:"ProtocolImplementationConformanceStatement(PICS)proformaspecification";Part3:"TestSuiteStructureandTestPurposes(TSS&TP)specificationfortheuser";Part4:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuser";Part5:"TestSuiteStructureandTestPurposes(TSS&TP)specificationforthenetwork";Part6:"AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationforthenetwork".NationaltranspositiondatesDateofadoptionofthisEN:12November1999DateoflatestannouncementofthisEN(doa):29February2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2000DateofwithdrawalofanyconflictingNationalStandard(dow):31August2000SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)61ScopeThissixthpartofEN301060isapplicabletotheBasiccallcontrolextensionsatthe"b"serviceentrypointforVPNapplicationsforthepan-EuropeanIntegratedServicesDigitalNetwork(ISDN)asprovidedbyEuropeanpublictelecommunicationsoperatorsattheTreferencepoint(asdefinedinITU-TRecommendationI.411[8])bymeansoftheDigitalSubscriberSignallingSystemNo.one(DSS1)protocol.Stagethreeidentifiestheprotocolproceduresandswitchingfunctionsneededtosupportatelecommunicationsservice(seeCCITTRecommendationI.130[7]).ThepresentdocumentspecifiestheAbstractTestSuite(ATS),andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformafortheusersideoftheTreferencepointorcoincidentSandTreferencepointofimplementationconformingtoEN301060-1[2]incompliancewiththerelevantrequirementsandinaccordancewiththerelevantguidancegiveninISO/IEC9646[3]to[6].2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]EN300403-1(V1.3):"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Signallingnetworklayerforcircuit-modebasiccallcontrol;Part1:Protocolspecification[ITU-TRecommendationQ.931(1993),modified]".[2]EN301060-1:"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part1:Protocolspecification".[3]ISO/IEC9646-1:"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part1:Generalconcepts".[4]ISO/IEC9646-3:"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part3:TheTreeandTabularCombinedNotation(TTCN)".[5]ISO/IEC9646-4:"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part4:Testrealization".[6]ISO/IEC9646-5:"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part5:Requirementsontestlaboratoriesandclientsfortheconformanceassessmentprocess".[7]CCITTRecommendationI.130(1988):"MethodforthecharacterizationoftelecommunicationservicessupportedbyanISDNandnetworkcapabilitiesofanISDN".[8]ITU-TRecommendationI.411(1993):"ISDNuser-networkinterfaces-Referenceconfigurations".[9]EN301060-2(V1.1):"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part2:ProtocolImplementationConformanceStatement(PICS)proformaspecification".SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)7[10]EN301060-3(V1.1):"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part3:TestSuiteStructureandTestPurposes(TSS&TP)specificationfortheuser".[11]ITU-TRecommendationI.112(1993):"VocabularyoftermsforISDNs".[12]ITU-TRecommendationI.210(1993):"PrinciplesoftelecommunicationservicessupportedbyanISDNandthemeanstodescribethem".[13]ITU-TRecommendationE.164(1997):"Theinternationalpublictelecommunicationnumberingplan".[14]ISO/IEC9646-2:"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part2:Abstracttestsuitespecification".[15]EN301060-4(V1.1):"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part4:AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuser".[16]EN301060-5(V1.1):"IntegratedServicesDigitalNetwork(ISDN);DigitalSubscriberSignallingSystemNo.one(DSS1)protocol;Basiccallcontrol;Enhancementatthe"b"serviceentrypointforVirtualPrivateNetwork(VPN)applications;Part5:TestSuiteStructureandTestPurposes(TSS&TP)specificationforthenetwork".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply.3.1.1Definitionsrelatedtoconformancetestingabstracttestcase:refertoISO/IEC9646-1[3]AbstractTestSuite(ATS):refertoISO/IEC9646-1[3]activetest:testcasewheretheIUTisrequiredtosendaparticularmessage,butnotinreactiontoareceivedmessage.ThiswouldusuallyinvolvetheuseofPIXITinformationtoseehowthismessagecanbegeneratedandquiteoftenisspecifiedinanATSusinganimplicitsendeventImplementationUnderTest(IUT):refertoISO/IEC9646-1[3]implicitsendevent:refertoISO/IEC9646-3[4]lowertester:refertoISO/IEC9646-1[3]passivetest:testcasewheretheIUTisrequiredtorespondtoaprotocolevent(e.g.receivedmessage)withanotherprotocolevent(e.g.sendmessage)whichnormallydoesnotrequireanyspecialoperatorinterventionasassociatedwiththeimplicitsendeventpointofcontrolandobservation:refertoISO/IEC9646-1[3]ProtocolImplementationConformanceStatement(PICS):refertoISO/IEC9646-1[3]PICSproforma:refertoISO/IEC9646-1[3]ProtocolImplementationeXtraInformationforTesting(PIXIT):refertoISO/IEC9646-1[3]SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)8PIXITproforma:refertoISO/IEC9646-1[3]systemundertest:refertoISO/IEC9646-1[3]TestPurpose(TP):refertoISO/IEC9646-1[3]3.1.2DefinitionsrelatedtoEN301060-1Dummycallreference:seeEN300403-1[1],subclause4.3IntegratedServicesDigitalNetwork(ISDN):seeITU-TRecommendationI.112[11],definition308ISDNnumber:numberconformingtothenumberingandstructurespecifiedinITU-TRecommendationE.164[13]service;telecommunicationservice:seeITU-TRecommendationI.112[11],definition201supplementaryservice:seeITU-TRecommendationI.210[12],subclause2.4T:DSS1protocolentityattheUsersideoftheuser-networkinterfacewhereaTreferencepointapplies(UserisaPrivateISDN)3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ASPAbstractServicePrimitiveATMAbstractTestMethodATSAbstractTestSuiteBABasicAccessCESConnectionEndpointSuffixCMCo-ordinationMessageDSS1DigitalSubscriberSignallingSystemNo.oneExTSExecutableTestSuiteISDNIntegratedServicesDigitalNetworkIUTImplementationUnderTestLTLowerTesterMOTMeansOfTestingMTCMainTestComponentPCOPointofControlandObservationPCTRProtocolConformanceTestReportPDUProtocolDataUnitPICSProtocolImplementationConformanceStatementPIXITProtocolImplementationeXtraInformationforTestingPRAPrimaryRateAccessPTCParallelTestComponentsSUTSystemUnderTestTPTestPurposeTSSTestSuiteStructureTTCNTreeandTabularCombinedNotationUTUpperTesterVPNVirtualPrivateNetworkSIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)94AbstractTestMethod4.1DescriptionofATMusedTherequirementfortestingthenetworkIUTistofocusonthebehaviourofthenetworkIUTattheuser-networkinterfacewhereaTreferencepointorcoincidentSandTreferencepointapplies.ThustheIUTisthenetworkDSS1protocolentityataparticularuser-networkinterfaceandisnotthewholenetwork.ItispossibletospecifyanATSbasedonaSingleparty(remote)testmethodforsuchanIUT.However,itisconsideredthatanATSbasedonsuchanapproachisoflimiteduseastheonlywaytospecifyIUTgeneratedPDUsistousethe"implicitsend"statement.ManyusersofsuchanATSwouldreplacethe"implicitsend"statementswithdescriptionsofthebehaviouratotherinterfaces.AnATSbasedonamulti-partytestmethodisconsideredtobemoreusefulinthatitisclosertohowarealtestsuitewouldbeconstructed.Suchatestmethodspecifiesbehaviouratmultiplenetworkinterfaces.Oneveryimportantlimitationhereisthattestsarefocussedononeparticularinterface.ThusthetestsystemismadeuponeMainTestComponent(MTC)andoneormoreParallelTestComponents(PTC),seefigure1.4.2ConventionsfortestcomponentsandPCOsMasterpartSlavepartMTCAPTC2CPA2PTC1CPA1L0PCOL1PCOL2PCOIUTNETWORKFigure1:Multi-partytestmethodInamaster/slavearrangement,theMTCisconsideredtobethemasterwhilethePTCsaretheslaves.The"slave"testersareonlyanexplicitdescriptionofhowtodealwiththe"other"interfacesduringthetestingprocess,i.e."howtomaketheIUTsendtherequiredmessage".SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)10Thismeans,inparticular,thattheverdictwillonlybeassignedfromtheprotocolaspectsobservedontheinterfaceundertest(i.e.bythe"master"tester),asitwouldbeobservedbyaterminalconnectedtothisinterface.Afailureinthecorrelationbetweentheprotocolatthedifferentinterfacestowhichthedifferenttestersareconnected,i.e.inthemechanismofthefunctionalserviceitself,willnotcauseaFAILverdict.Forinstance,iftheIUTfailstosendamessageonthetestedinterfaceafteranotherinterfacehasreceivedtheproperstimulus,theverdictwillbeINCONCLUSIVE.TheMTCMTCAhastwofunctionsinthisconfiguration.Firstly,ithastheMTCfunctionofcontrollingtheoneormorePTCs.ThusitisresponsibleforstartingthePTCsandafterwardscoordinatesactivitiesbyexchangingCo-ordinationMessages(CM)withthePTCs.SecondlyitisresponsibleforthebehaviouroftheLowerTester(LT)atPCOL0.Acombinationoftheremoteandmulti-partytestmethodsisapplied.Ascanbeseenfromfigure1,severalPCOsareused.AllPCOsresideattheserviceaccesspointsbetweenlayers2and3.MTCSUTPTC1,2Layer3Layer2Layer1L0IUTL1,2Layer3Layer2Layer1ServiceproviderFigure2:Combinationoftheremoteandmulti-partytestmethodsTheMTCPCOisnamed"L0"("L"forLower).TheL0PCOisusedtocontrolandobservethebehaviouroftheIUTandtestcaseverdictsareassigneddependingonthebehaviourobservedatthisPCO.ThePTCsPTC1,PTC2etc.usePCOsL1,L2etc.ThesePCOsareusedtocontroland,inalimitedway,observethebehaviourofthenetworkequipmentatinterfacesotherthantheoneundertest.NoverdictsareassignedatthesePCOs.Asstatedinapreviousparagraph,thenon-receiptofnetworkgeneratedmessagesatL0,whicharestimulatedbyeventsattheL1,L2etc.,willresultinINCONCLUSIVEratherthanFAILverdictsbeingassigned.PTC2isonlyactivatedinasmallsetoftestcasesthattestthehandlingoftwocallsatonetime.IntestcaseswhichverifythattheIUTrejectsinvalidorunacceptableSETUPmessages,noPTCisactivatedatall,astheserejectionproceduresareconsideredlocaltotheaccessbetweenIUTandMTC.ThecapabilityoftheIUTtosendINFORMATIONandPROGRESSmessagesistestedindifferentcallstates.Implicitsendeventshavetobeusedinthissmallsetoftestcases,asthesendingofthosemessagescannotbetriggeredviaaPTC.SeparatePIXITquestionsareaskedforeachcallstate,ifandhowitispossibleforthetestoperatortocausethesendingofthemessages.5UntestabletestpurposesTherearenountestabletestpurposesinthisATS.SeeEN301060-5[16].SIST EN 301 060-6 V1.1.4:2005



ETSIETSIEN301060-6V1.1.4(1999-11)116ATSconventionsThisclauseisstructuredsimilarlytothestructureofaTTCNATS.However,thenamesofthesubclausesarearrangedinawaymoresuitabletothepresentdocument.6.1Declarationspart6.1.1Typedefinitions6.1.1.1SimpletypedefinitionsWhereappropriate,simpletypeshavealength,avaluelistorarangerestrictionattached.Simpletypesdefinedasbeingofsomestringtype(e.g.BITSTRING,OCTETSTRING),havealengthrestrictionoravaluelistattached.Simpletypes,definedasbeingofINTEGERtype,haveavaluelistorarangerestrictionattached.6.1.1.2Structuredtypedefinitions6.1.1.2.1TTCNstructuredtypedefinitionsAllstructuredtypedefinitionsareprovidedwithafullname.Allelementsineverystructuredtypedefinition,definedasbeingofsomestringtype(e.g.BITSTRING,OCTETSTRING),havealengthrestrictionattached.Ifanelementinastructuredtypedefinitionisdefinedasbeingofareferencedtype,the(possible)restrictionisdefinedinthatreferencedtype.Forinformationelementstheidentifier,whichisuniqueforeachelement,hasitstypedefinedasasimpletypewherethevaluelistisrestrictedtothesinglevaluewhichistheidentifieritself.ThishastheadvantagethatitallowsatestsystemderivedfromthisATStoeasilyidentifyinformationelementsembeddedinmessages.AnATSwhereinformationelementidentifiersarerepresentedasunrestrictedtypescanpresentdifficultiesforaderivedtestsysteminthecasewhereitneedstofindoneinformationelementembeddedinanumberofothersandtheconstraintsfortheotherelementshavetheany-or-omitvalue.Insuchacasethetestsystemcannoteasilyfindthebeginningofeachinformationelement.6.1.1.2.2ASN.1structuredtypedefinitionsTherearenoASN.1structuredtypedefinitionsintheATS.6.1.1.3ASPtypedefinitions6.1.1.3.1TTCNASPtypedefinitionsTTCNASPtypedefinitionsonlycontainonePDUornoPDUatall.AllTTCNASPtypedefinitio
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