SIST EN 301 067-4 V1.1.3:2003
(Main)Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; Negotiation during call/connection establishment phase; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementations eXtra Information for Testing (PIXIT) proforma specification for the user
- Abstract
Develop part 4 (ATS & PIXIT for the user) of EN 301 067
- 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
- M/213
SIST EN 301 067-4 V1.1.3:2003 is an ETSI European Standard published by SIST for conformance testing of the user side of Broadband Integrated Services Digital Network (B-ISDN) Digital Subscriber Signalling System No. two (DSS2) connection-characteristics negotiation during call or connection establishment. It specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for implementations that conform to EN 301 067-1, so test laboratories and implementers can use the same user-side test basis.
What does SIST EN 301 067-4 V1.1.3:2003 specify?
SIST EN 301 067-4 V1.1.3:2003 specifies the user ATS for the TB reference point, or a coincident SB and TB reference point, for implementations that follow EN 301 067-1. In practical terms, it tells testers how to assess user-side DSS2 behaviour for negotiation during call or connection establishment.
The document is organized into clauses for scope, references, definitions and abbreviations, the Abstract Test Method (ATM), untestable test purposes, ATS-to-TP mapping, and conformance statements for PCTR, PIXIT and ATS. It also includes three normative annexes that carry the test-report proforma, the partial PIXIT proforma, and the ATS itself.
| Annex | What it covers |
|---|---|
| Annex A | Protocol Conformance Test Report (PCTR) proforma |
| Annex B | Partial PIXIT proforma |
| Annex C | Abstract Test Suite (ATS) |
What are the key requirements of SIST EN 301 067-4 V1.1.3:2003?
SIST EN 301 067-4 V1.1.3:2003 is built around a remote test method. Clause 4 places the Point of Control and Observation (PCO) at the service access point between layers 2 and 3 and names it L0. This matters because verdicts are based on behaviour seen at that interface, not on internal implementation details.
Clause 4 also introduces an informal operator PCO, named O, to control the System Under Test (SUT) above the IUT. The document uses O for coordination only, not for verdicts, which helps testers describe required actions clearly without turning operator steps into pass or fail conditions.
Clause 5 states that there are no untestable test purposes in this ATS. For a user, that means the ATS is intended to be fully exercisable as written.
Clause 6 gives a direct one-to-one mapping between the Test Purposes (TPs) in EN 301 067-3 and the test case names used here. That makes it easier to trace a failed test back to the underlying test purpose.
Clause 7 defines PCTR conformance. A laboratory that produces a PCTR for this ATS must use the annex A proforma and keep the clause order and content structure. In practice, this gives clients a report format they can compare across laboratories.
Clause 8 defines PIXIT conformance. The partial PIXIT proforma in annex B gives the minimum technical content, while a laboratory may add questions needed to prepare the Means of Testing (MOT) for a specific IUT. This matters because the exact timers, parameters and configuration choices can differ between installations.
Clause 9 defines ATS conformance for the test realizer, MOT and Executable Test Suite (ExTS). The ExTS must be technically equivalent to the ATS in annex C, and all abstract test event sequences must be realizable. In practice, this keeps automated test systems aligned with the standard.
What terms does SIST EN 301 067-4 V1.1.3:2003 define?
- Abstract Test Method (ATM) - the test approach used here, based on a remote tester arrangement and observation at a defined PCO.
- Abstract Test Suite (ATS) - the set of abstract test cases and test purposes used to assess conformance.
- Implementation Under Test (IUT) - the implementation being assessed against the protocol specification.
- System Under Test (SUT) - the whole system that contains or supports the IUT during testing.
- Point of Control and Observation (PCO) - the point where the tester controls and observes behaviour for verdict assignment.
- Protocol Implementation Conformance Statement (PICS) - the statement of which protocol features an implementation supports.
- Protocol Implementation eXtra Information for Testing (PIXIT) - the additional implementation-specific information needed to run the tests.
- Test Purpose (TP) - the statement of what a test case is meant to verify.
Who uses SIST EN 301 067-4 V1.1.3:2003?
This standard is used by conformance test laboratories, test realizers, and clients commissioning testing of B-ISDN DSS2 user-side implementations. It is also used by equipment vendors and developers working on the user side of the B-ISDN user-network interface where a TB reference point, or coincident SB/TB reference point, applies. In practice, they use it to build test cases, prepare PIXIT data, run conformance campaigns, and write PCTR reports.
Which standards are used with SIST EN 301 067-4 V1.1.3:2003?
- EN 301 067-1 - the protocol specification for connection characteristics negotiation during call or connection establishment.
- EN 301 067-2 - the PICS proforma for the same protocol.
- EN 301 067-3 - the TSS and TP specification for the user.
- EN 300 443-1 - the related DSS2 protocol specification for basic call and bearer control.
- EN 300 443-2 - the related PICS proforma for that basic call and bearer control part.
- ISO/IEC 9646-1 to 9646-5 - the conformance testing framework, ATS specification, TTCN, test realization, and laboratory/client requirements.
- ITU-T Recommendation I.413 - the B-ISDN user-network interface reference used for the TB and coincident SB/TB reference points.
What does the SIST EN 301 067-4 V1.1.3:2003 document contain?
Annex A gives the PCTR proforma, including identification, test environment, conformance status, static and dynamic summaries, and a test campaign report section. Annex B gives the partial PIXIT proforma, including test laboratory data, SUT details, configuration to be tested, test-management timers, and parameter values such as bearer capability, called-party numbering information, ATM traffic descriptor settings, and preferred VPCI/VCI values.
Annex C contains the ATS itself in Tree and Tabular Combined Notation (TTCN), with both a graphical form in PDF and a machine-processable form in ASCII. For users, this means the document is not just a narrative standard - it also carries the structured test material needed to implement or review conformance testing.
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Frequently Asked Questions
SIST EN 301 067-4 V1.1.3:2003 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; Negotiation during call/connection establishment phase; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementations eXtra Information for Testing (PIXIT) proforma specification for the user". This standard covers: Develop part 4 (ATS & PIXIT for the user) of EN 301 067
Develop part 4 (ATS & PIXIT for the user) of EN 301 067
SIST EN 301 067-4 V1.1.3:2003 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 301 067-4 V1.1.3:2003 is associated with the following European legislation: Standardization Mandates: M/213. 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 301 067-4 V1.1.3:2003 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; Negotiation during call/connection establishment phase; Part 4: Abstract Test Suite (ATS) and partial Protocol Implementations eXtra Information for Testing (PIXIT) proforma specification for the user33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 301 067-4 Version 1.1.3SIST EN 301 067-4 V1.1.3:2003en01-december-2003SIST EN 301 067-4 V1.1.3:2003SLOVENSKI
STANDARD
ETSIEN301067-4V1.1.3(1999-11)EuropeanStandard(Telecommunicationsseries)BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;Negotiationduringcall/connectionestablishmentphase;Part4:AbstractTestSuite(ATS)andpartialProtocolImplementationeXtraInformationforTesting(PIXIT)proformaspecificationfortheuserSIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)2ReferenceDEN/SPS-05151-4(9vp00ie0.PDF)KeywordsATM,ATS,B-ISDN,broadband,DSS2,ISDN,PIXIT,UNI,userETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshouldbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute1999.Allrightsreserved.SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.1.1Definitionsrelatedtoconformancetesting.73.1.2DefinitionsrelatedtoEN301067-1.73.2Abbreviations.84AbstractTestMethod(ATM).85Untestabletestpurposes.86ATStoTPmap.97PCTRconformance.98PIXITconformance.99ATSConformance.9AnnexA(normative):ProtocolConformanceTestReport(PCTR)proforma.10A.1Identificationsummary.10A.1.1Protocolconformancetestreport.10A.1.2IUTidentification.10A.1.3Testingenvironment.10A.1.4Limitsandreservations.11A.1.5Comments.11A.2IUTConformancestatus.11A.3Staticconformancesummary.11A.4Dynamicconformancesummary.12A.5Staticconformancereviewreport.12A.6Testcampaignreport.12A.7Observations.13AnnexB(normative):PartialPIXITproforma.14B.1Identificationsummary.14B.2Abstracttestsuitesummary.14B.3Testlaboratory.14B.4Client(oftheTestLaboratory).15B.5SUT.15B.6Protocolinformation.16B.6.1Protocolidentification.16B.6.2Configurationtobetested.16B.6.3Testmanagementtimers.16B.6.4ParameterValues.17SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)4AnnexC(normative):AbstractTestSuite(ATS).18C.1TheTTCNGraphicalform(TTCN.GR).18C.2TheTTCNMachineProcessableform(TTCN.MP).18Bibliography.19History.20SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(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).Thepresentdocumentispart4ofamulti-partENcoveringtheBroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;Negotiationduringcall/connectionestablishmentphase,asdescribedbelow:Part1:"Protocolspecification[ITU-TRecommendationQ.2962(1996),modified]";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:26November1999DateoflatestannouncementofthisEN(doa):29February2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31August2000DateofwithdrawalofanyconflictingNationalStandard(dow):31August2000SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)61ScopeThepresentdocumentspecifiestheuserAbstractTestSuite(ATS)fortheTBreferencepointorcoincidentSBandTBreferencepoint(asdefinedinITU-TRecommendationI.413[11])ofimplementationsconformingtothestandardsforthesignallinguser-networklayer3specificationforNegotiationduringcall/connectionestablishmentphaseoftheDigitalSubscriberSignallingSystemNo.two(DSS2)protocolforthepan-EuropeanBroadbandIntegratedServicesDigitalNetwork(B-ISDN),EN301067-1[1].AfurtherpartofthepresentdocumentspecifiestheTestSuiteStructureandTestPurposes(TSS&TP)relatedtothisATSandpartialPIXITproforma.OtherpartsspecifytheTSS&TPandtheATSandpartialPIXITproformafortheNetworksideoftheTBreferencepointorcoincidentSBandTBreferencepointofimplementationsconformingtoEN301067-1[1].2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]EN301067-1(V1.1):"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;Negotiationduringcall/connectionestablishmentphase;Part1:Protocolspecification[ITU-TRecommendationQ.2962(1996),modified]".[2]EN301067-2(V1.1):"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;Negotiationduringcall/connectionestablishmentphase;Part2:ProtocolImplementationConformanceStatement(PICS)proformaspecification".[3]EN301067-3(V1.1):"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;Connectioncharacteristics;Negotiationduringcall/connectionestablishmentphase;Part3:TestSuiteStructureandTestPurposes(TSS&TP)specificationfortheuser".[4]EN300443-1:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;B-ISDNuser-networkinterfacelayer3specificationforbasiccall/bearercontrol;Part1:Protocolspecification[ITU-TRecommendationQ.2931(1995),modified]".[5]EN300443-2:"BroadbandIntegratedServicesDigitalNetwork(B-ISDN);DigitalSubscriberSignallingSystemNo.two(DSS2)protocol;B-ISDNuser-networkinterfacelayer3specificationforbasiccall/bearercontrol;Part2:ProtocolImplementationConformanceStatement(PICS)proformaspecification".[6]ISO/IEC9646-1(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part1:Generalconcepts".[7]ISO/IEC9646-2(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part2:AbstractTestSuitespecification".SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)7[8]ISO/IEC9646-3(1998):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part3:TheTreeandTabularCombinedNotation(TTCN)".[9]ISO/IEC9646-4(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part4:Testrealization".[10]ISO/IEC9646-5(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part5:Requirementsontestlaboratoriesandclientsfortheconformanceassessmentprocess".[11]ITU-TRecommendationI.413(1993):"B-ISDNuser-networkinterface".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingdefinitionsapply,inadditiontothosegiveninEN301067-1[1]andEN300443-1[4]:3.1.1Definitionsrelatedtoconformancetestingabstracttestcase:refertoISO/IEC9646-1[6]AbstractTestMethod(ATM):refertoISO/IEC9646-1[6]AbstractTestSuite(ATS):refertoISO/IEC9646-1[6]ImplementationUnderTest(IUT):refertoISO/IEC9646-1[6]SystemUnderTest(SUT):seeISO/IEC9646-1[6]UpperTester(UT):seeISO/IEC9646-1[6]lowertester:refertoISO/IEC9646-1[6]ProtocolImplementationConformanceStatement(PICS):refertoISO/IEC9646-1[6]PICSproforma:refertoISO/IEC9646-1[6]ProtocolImplementationeXtraInformationforTesting(PIXIT):refertoISO/IEC9646-1[6]PIXITproforma:refertoISO/IEC9646-1[6]TestPurpose(TP):refertoISO/IEC9646-1[6]PointofControlandObservation(PCO):seeISO/IEC9646-1[6]3.1.2DefinitionsrelatedtoEN301067-1user:DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereaTBreferencepointorcoincidentSBandTBreferencepointappliesuser(SB/TB):DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereacoincidentSBandTBreferencepointappliesuser(TB):DSS2protocolentityattheUsersideoftheuser-networkinterfacewhereaTBreferencepointapplies(userisaprivateISDN)SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)83.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:ATMAbstractTestMethodATSAbstractTestSuiteB-ISDNBroadbandIntegratedServicesDigitalNetworkDSS2DigitalSubscriberSignallingSystemNo.twoExTSExecutableTestSuiteIUTImplementationUnderTestLTLowerTesterMOTMeansOfTestingPCOPointofControlandObservationPICSProtocolImplementationConformanceStatementPIXITProtocolImplementationeXtraInformationforTestingSUTSystemUnderTestTPTestPurposeTSSTestSuiteStructureTTCNTreeandTabularCombinedNotationU0NulllinkstateU7CallReceivedlinkstateUTUpperTesterVCIVirtualChannelIdentifierVPCIVirtualPathConnectionIdentifier4AbstractTestMethod(ATM)TheremotetestmethodisappliedfortheuserATS.ThePointofControlandObservation(PCO)residesattheserviceaccesspointbetweenlayers2and3.ThisPCOisnamed"L0"(forLower).TheL0PCOisusedtocontrolandobservethebehaviouroftheImplementationUnderTest(IUT)andtestcaseverdictsareassigneddependingonthebehaviourobservedatthisPCO.TesterSUTLTIUTPCOLayer2Layer2Layer1Layer1ServiceproviderFigure1:RemotetestmethodISO/IEC9646-2[7]allowstheinformalexpressionofTestCo-ordinationProcedures(TCP)betweentheSystemUnderTest(SUT)upperlayer(s)andtheLowerTester(LT).IntheATScontainedinannexC,TCPisachievedbyuseofasecond"informal"PCO,called"O"(forOperator).ThisPCOisusedtospecifycontrolbutnotobservationabovetheIUTandconsequently,eventsatthisPCOareneverusedtogeneratetestcaseverdicts.TheuseofthisOPCOisregardedasapreferredalternativetotheuseoftheimplicitsendevent,inthatitallowstheATStospecifyinaclearandmeaningfulwaywhatactionsarerequiredtobeperformedontheIUT.5UntestabletestpurposesTherearenountestabletestpurposesassociatedwiththisATS.SIST EN 301 067-4 V1.1.3:2003
ETSIETSIEN301067-4V1.1.3(1999-11)96ATStoTPmapTheidentifiersusedfortheTPs(seeEN301067-3[3])arereusedastestcasenames.Thusthereisastraightforwardone-to-onemapping.7PCTRconformanceAtestlaboratory,whenrequestedbyaclienttoproduceaPCTR,isrequired,asspecifiedinISO/IEC9646-5[10],toproduceaPCTRconformantwiththePCTRtemplategiveninannexBofISO/IEC9646-5[10].Furthermore,atestlaboratory,offeringtestingfortheATSspecificationcontainedinannexC,whenrequestedbyaclienttoproduceaPCTR,isrequiredtoproduceaPCTRconformantwiththePCTRproformacontainedinannexAofthepresentdocument.APCTRwhichconformstothisPCTRproformaspecificationshallpreservethecontentandorderingoftheclausescontainedinannexA.ClauseA.6ofthePCTRmaycontainadditionalcolumns.Ifincluded,theseshallbeplacedtotherightoftheexistingcolumns.Textinitalicsmayberetainedbythetestlaboratory.8PIXITconformanceAtestrealizer,producinganexecutabletestsuitefortheAbstractTestSuite(ATS)specificationcontainedinannexC,isrequired,asspecifiedinISO/IEC9646-4[9],toproduceanaugmentedpartialPIXITproformaconformantwiththispartialPIXITproformaspecification.AnaugmentedpartialPIXITproformawhichconformstothispartialPIXITproformaspecificationshall,asaminimum,havecontentswhicharetechnicallyequivalenttoannexB.TheaugmentedpartialPIXITproformamaycontainadditionalquestionsthatneedtobeansweredinordertopreparetheMeansOfTesting(MOT)foraparticularImplementationUnderTest(IUT).Atestlaboratory,offeringtestingfortheATSspecificationcontainedinannexC,isrequired,asspecifiedinISO/IEC9646-5[10],tofurtheraugmenttheaugmentedpartialPIXITproformatoproduceaPIXITproformaconformantwiththispartialPIXITproformaspecification.APIXITproformawhichconformstothispartialPIXITproformaspecificationshall,asaminimum,havecontentswhicharetechnicallyequivalenttoannexB.ThePIXITproformamaycontainadditionalq
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