ETSI EN 300 394-4-5 V1.1.1 (2001-01)

Terrestrial Trunked Radio (TETRA); Conformance testing specification; Part 4: Protocol testing specification for Direct Mode Operation (DMO); Sub-part 5: Abstract Test Suite (ATS) for Mobile Station (MS) Repeater type 1

DEN/TETRA-02009-4-5

Prizemni snopovni radio (TETRA) - Specifikacija za preskušanje skladnosti - 4. del: Specifikacija za preskušanje protokola za neposredno obratovanje (DMO) ¬- 5. poddel: Abstraktni preskušalni niz (ATS) za ponavljalnik (repetitor) mobilne postaje tipa 1

General Information

• Status: Published
• Publication Date: 11-Jan-2001
• Technical Committee: TCCE 2 - Air Interface / Radio aspects
• Current Stage: 13 - TB decision to make document historical
• Due Date: 23-Feb-2004
• Completion Date: 23-Feb-2004
• Mandate: BC-T-344
• Ref Project: SIST EN 300 394-4-5 V1.1.1:2003 - Terrestrial Trunked Radio (TETRA); Conformance testing specification; Part 4: Protocol testing specification for Direct Mode Operation (DMO); Sub-part 5: Abstract Test Suite (ATS) for Mobile Station (MS) Repeater type 1

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prizemni snopovni radio (TETRA) - Specifikacija za preskušanje skladnosti - 4. del: Specifikacija za preskušanje protokola za neposredno obratovanje (DMO) ¬- 5. poddel: Abstraktni preskušalni niz (ATS) za ponavljalnik (repetitor) mobilne postaje tipa 1Terrestrial Trunked Radio (TETRA); Conformance testing specification; Part 4: Protocol testing specification for Direct Mode Operation (DMO); Sub-part 5: Abstract Test Suite (ATS) for Mobile Station (MS) Repeater type 133.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:EN 300 394-4-5 Version 1.1.1SIST EN 300 394-4-5 V1.1.1:2003en01-december-2003SIST EN 300 394-4-5 V1.1.1:2003SLOVENSKI
STANDARD



SIST EN 300 394-4-5 V1.1.1:2003



ETSIEN300394-4-5V1.1.1(2001-01)EuropeanStandard(Telecommunicationsseries)TerrestrialTrunkedRadio(TETRA);Conformancetestingspecification;Part4:ProtocoltestingspecificationforDirectModeOperation(DMO);Sub-part5:AbstractTestSuite(ATS)forMobileStation(MS)Repeatertype1SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)2ReferenceDEN/TETRA-02009-4-5KeywordsTETRA,DMO,protocol,testing,TTCN,ATS,PIXIT,radioETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:[phone]Fax:[phone]SiretN°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:[e-mail]opartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.63Definitionsandabbreviations.73.1TETRAdefinitions.73.2TETRAabbreviations.73.3ISO9646definitions.73.4ISO9646abbreviations.74AbstractTestMethod(ATM).84.1ATMfortheMS-REP1MACATS.84.1.1LowerTester(LT).84.1.2UpperTester(UT).84.1.3TestCo-ordinationProcedures(TCP).94.1.4PointofControlandObservation(PCO).94.2ATMfortheMS-REP1DMCCATS.94.2.1LowerTester(LT).104.2.2UpperTester(UT).104.2.3TestCo-ordinationProcedures(TCP).104.2.4PointofControlandObservation(PCO).105ATSconventions.105.1Namingconventions.105.1.1Declarationspart.105.1.1.1Testsuitetypeandstructuredtypedefinitions.105.1.1.2Testsuiteoperationsdefinitions.105.1.1.3Testsuiteparameterdeclarations.115.1.1.4Testcaseselectionexpressiondefinitions.115.1.1.5Testsuiteconstantdeclarations.115.1.1.6Testsuitevariabledeclarations.115.1.1.7Testcasevariabledeclarations.115.1.1.8PCOdeclarations.115.1.1.9Timerdeclarations.115.1.1.10ASPtypedefinitions.125.1.1.11PDUtypedefinitions.125.1.1.12Aliasdefinitions.125.1.2Constraintspart.125.1.3Dynamicpart.135.1.3.1Testcaseidentifier.135.1.3.2Teststepidentifier.135.1.3.3Defaultidentifier.135.2TCandTPnaming.13AnnexA(normative):ATSforTETRADMOMS-REP1.14A.1AbstractTestSuite(ATS)forTETRADMOMS-REP1MACprotocol.14A.1.1TheTTCNGraphicalform(TTCN.GR).14A.1.2TheTTCNMachineProcessableform(TTCN.MP).14A.2ATSforTETRADMOMS-REP1DMCCprotocol.14A.2.1TheTTCNGraphicalform(TTCN.GR).14A.2.2TheTTCNMachineProcessableform(TTCN.MP).14SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)4AnnexB(normative):PartialPIXITproformaforTETRADMOMS-REP1protocol.15B.1PartialPIXITproformaforTETRADMOMS-REP1MAClayerprotocol.15B.1.1Identificationsummary.15B.1.2ATSsummary.15B.1.3Testlaboratory.15B.1.4Clientidentification.15B.1.5SUT.16B.1.6Protocollayerinformation.16B.1.6.1Protocolidentification.16B.1.6.2IUTinformation.16B.1.6.2.1Implicitsendevents.16B.1.6.2.2Parametervalues.17B.2PartialPIXITproformaforTETRADMOMS-REP1DMCCprotocol.18B.2.1Identificationsummary.18B.2.2ATSsummary.18B.2.3Testlaboratory.18B.2.4Clientidentification.18B.2.5SUT.19B.2.6Protocollayerinformation.19B.2.6.1Protocolidentification.19B.2.6.2IUTinformation.19B.2.6.2.1Implicitsendevents.19B.2.6.2.2Parametervalues.20AnnexC(normative):ProtocolConformanceTestReport(PCTR)proformaforTETRADMOMS-REP1protocol.22C.1PCTRproformaforTETRADMOMS-REP1MAClayerprotocol.22C.1.1Identificationsummary.22C.1.1.1Protocolconformancetestreport.22C.1.1.2IUTidentification.22C.1.1.3Testingenvironment.23C.1.1.4Limitsandreservation.23C.1.1.5Comments.23C.1.2IUTconformancestatus.23C.1.3Staticconformancesummary.23C.1.4Dynamicconformancesummary.24C.1.5Staticconformancereviewreport.24C.1.6Testcampaignreport.25C.1.7Observations.25C.2PCTRproformaforTETRADMOMS-REP1DMCClayerprotocol.26C.2.1Identificationsummary.26C.2.1.1Protocolconformancetestreport.26C.2.1.2IUTidentification.26C.2.1.3Testingenvironment.26C.2.1.4Limitsandreservation.26C.2.1.5Comments.27C.2.2IUTconformancestatus.27C.2.3Staticconformancesummary.27C.2.4Dynamicconformancesummary.27C.2.5Staticconformancereviewreport.27C.2.6Testcampaignreport.28C.2.7Observations.29History.30SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)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)hasbeenproducedbyETSIProjectTerrestrialTrunkedRadio(TETRA).ThepresentdocumenthadbeensubmittedtoPublicEnquiryasETS300394-4-5.DuringtheprocessingforVoteitwasconvertedintoanEN.Thepresentdocumentconsistsofthefollowingparts:Part1:"Radio";Part2:"ProtocoltestingspecificationforVoiceplusData(V+D)";Part4:"ProtocoltestingspecificationforDirectModeOperation(DMO)";Part5:"Security".NationaltranspositiondatesDateofadoptionofthisEN:5January2001DateoflatestannouncementofthisEN(doa):30April2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31October2001DateofwithdrawalofanyconflictingNationalStandard(dow):31October2001SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)61ScopeThepresentdocumentcontainstheAbstractTestSuites(ATS)totesttheTETRADirectModeOperation(DMO)MobileStationRepeaterType1(MS-REP1)protocolatlayer3,calledDirectModeCallControl(DMCC)andtheMS-Repeatertype1protocolatlayer2,theMediumAccessControl(MAC)protocol.TheDMCCandMACprotocolsarespecifiedinETS300396-3[1]andinEN300396-4[2].TheTestSuiteStructure(TSS)andTestPurposes(TPs)forthetwoATSsaredefinedinEN300394-4-3[4].TheobjectiveofthetestspecificationsaretoprovideabasisforapprovaltestsforTETRADMOMSequipmentsupportingtheRepeaterType1protocols,givingahighprobabilityofairinterfaceinter-operabilitybetweendifferentmanufacturer'sTETRAequipment.TheISOstandardforthemethodologyofconformancetesting,ISO/IEC9646-1[5],ISO/IEC9646-2[6],ISO/IEC9646-3[7]andISO/IEC9646-5[8],aswellastheETSIrulesforconformancetesting,ETS300406[9]andETR141[10]areusedasabasisforthetestmethodology.AnnexAprovidestheTreeandTabularCombinedNotation(TTCN)partofthesetwoATSs.AnnexBprovidesthePartialProtocolImplementationeXtraInformationforTesting(PIXIT)ProformaofthesetwoATSs.AnnexCprovidestheProtocolConformanceTestReport(PCTR)ProformaoftheseATSs.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIETS300396-3:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part3:MobileStationtoMobileStation(MS-MS)AirInterface(AI)protocol".[2]ETSIEN300396-4:"TerrestrialTrunkedRadio(TETRA);TechnicalrequirementsforDirectModeOperation(DMO);Part4:Type1repeaterairinterface".[3]ETSIEN300396-8-2:"TerrestrialTrunkedRadio(TETRA);DirectModeOperation(DMO);Part8:ProtocolImplementationConformanceStatement(PICS)proformaspecification;Sub-part2:Type1repeaterAirInterface(AI)".[4]ETSIEN300394-4-3:"TerrestrialTrunkedRadio(TETRA);Conformancetestingspecification;Part4:ProtocoltestingspecificationforDirectModeOperation(DMO);Sub-part3:TestSuiteStructureandTestPurposes(TSS&TP)forMobileStation(MS)Repeatertype1".[5]ISO/IEC9646-1(1994):"Informationtechnology-OpenSystemsInterconnection-ConformanceTestingMethodologyandFramework-Part1:GeneralConcepts".(SeealsoITU-TRecommendationX.290(1991)).[6]ISO/IEC9646-2(1994):"Informationtechnology-OpenSystemsInterconnection-ConformanceTestingMethodologyandFramework-Part2:AbstractTestSuiteSpecification".(SeealsoITU-TRecommendationX.291(1991)).[7]ISO/IEC9646-3(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part3:Thetreeandtabularcombinednotation".(SeealsoITU-TRecommendationX.292(1992)).SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)7[8]ISO/IEC9646-5(1994):"Informationtechnology-OpenSystemsInterconnection-Conformancetestingmethodologyandframework-Part5:Requirementsontestlaboratoriesandclientsfortheconformanceassessmentprocess".(SeealsoITU-TRecommendationX.292(1992)).[9]ETSIETS300406:"MethodsforTestingandSpecification(MTS);Protocolandprofileconformancetestingspecifications;Standardizationmethodology".[10]ETSIETR141:"MethodsforTestingandSpecification(MTS);Protocolandprofileconformancetestingspecifications;TheTreeandTabularCombinedNotation(TTCN)styleguide".3Definitionsandabbreviations3.1TETRAdefinitionsForthepurposesofthepresentdocument,thetermsanddefinitionsgiveninEN300396-4[2]apply.3.2TETRAabbreviationsForthepurposesofthepresentdocumentthefollowingTETRAabbreviationsapply:DMCCDirectModeCallControlDMODirectModeOperationMACMediumAccessControlMSMobileStationMS-REP1MobileStationRepeaterType1SDSShortDataServiceSDUServiceDataUnit3.3ISO9646definitionsForthepurposesofthepresentdocumentthefollowingISO/IEC9646definitionsapply:TTCN.GRTTCN.MPProtocolConformanceTestReport(PCTR)PCTRproforma3.4ISO9646abbreviationsForthepurposesofthepresentdocumentthefollowingISO/IEC9646-1[5]abbreviationsapply:ASPAbstractServicePrimitiveATMAbstractTestMethodATSAbstractTestSuiteICSImplementationConformanceStatementIUTImplementationUnderTestIXITImplementationeXtraInformationforTestingLTLowerTesterMTCMainTestComponentPCOPointofControlandObservationPDUProtocolDataUnitPICSProtocolImplementationConformanceStatementsPIXITProtocolImplementationeXtraInformationforTestingPTCParallelTestComponentSAPServiceAccessPointSPyTSinglePartyTestingSUTSystemUnderTestSIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)8TCTestCaseTPTestPurposeTSSTestSuiteStructureTTCNTreeandTabularCombinedNotationUTUpperTesterForthepurposesofthepresentdocumentthefollowingISO/IEC9646-5[8]abbreviationsapply:PCTRProtocolConformanceTestReport4AbstractTestMethod(ATM)4.1ATMfortheMS-REP1MACATSThissubclausedescribestheATMusedfortestingtheMS-REP1MAClayerprotocolofaMobileStationRepeaterType1(MS-REP1).ItistheembeddedvariantoftheremotetestmethodusedinSinglePartyTesting(SPyT)context,asdefinedinISO/IEC9646-2[6],clause11.Thistestmethodhasbeenselected,because:-thistestmethodimpliesnospecificrequirementsfromtheImplementationUnderTest(IUT);-theupperServiceAccessPoint(SAP)oftheIUTcannotbedirectlyobserved;-thevarietyofthepossibleTETRAimplementationsisaserioustechnicalobstaclefortheadoptionofadifferentATM;-thistestmethodplacesminimumlimitationsintherealizationofconformancetesting.Theselectedtestmethodisillustratedinfigure1.TestsystemSUTUpperlayersIUTMAC-PDUsTETRAphysicallayerandradiocommunicationUTASPsDM-MACTCPLTlayerFigure1:RemoteSPyTtestmethodforTETRADMOMS-REP1MAClayer4.1.1LowerTester(LT)ALTislocatedinaremoteTETRAtestsystem.ItcontrolsandobservesthebehaviouroftheIUT.4.1.2UpperTester(UT)ThereisnoexplicitUTintheremotetestmethod,butthelayersaboveinsidetheSystemUnderTest(SUT)areusedimplicitlyfortestingtheDM-MAClayer.SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)94.1.3TestCo-ordinationProcedures(TCP)TheimplicitsendeventsdefinedbytheproviderofanimplementationinannexBservethepurposeoftheTCP.TheyareusedasaninputtotheIUTcommunicatingwiththeUTtoinitiatetesteventsattheMS-REP1MAClayer.4.1.4PointofControlandObservation(PCO)AlltesteventsatthePCOcarryingserviceuserdataarespecifiedintermsofMAClayerPDUs.OnlyfewAbstractServicePrimitives(ASPs)aredefinedforcontrolorobservationpurposes.ThemappingoftheMACPDUsintothephysicallayerframestructureislefttothetestimplementation.4.2ATMfortheMS-REP1DMCCATSThisclausedescribestheATMusedfortestingtheDMCCprotocolofaMS-REP1.TheselectedmethodistheembeddedvariantoftheremotetestmethodusedinSinglePartyTesting(SPyT)context,asdefinedinISO/IEC9646-2[6],clause11.Thistestmethodhasbeenselected,because:-thistestmethodimpliesnospecificrequirementsfromtheImplementationUnderTest(IUT);-theupperServiceAccessPoint(SAP)oftheIUTcannotbedirectlyobserved;-thevarietyofthepossibleTETRAimplementationsisaserioustechnicalobstaclefortheadoptionofadifferentATM;-thistestmethodplacesminimumlimitationsintherealizationofconformancetesting.Theselectedtestmethodisillustratedinfigure2.TestsystemSUTUpperlayersIUTDMCC-PDUsTETRAphysicallayerandradiocommunicationUTPCOASPsDMCCMAClayerMAClayerTCPLTlayerFigure2:RemotesinglepartytestmethodforTETRAMS-REP1DMCCprotocolSIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)104.2.1LowerTester(LT)ALTislocatedinaremoteTETRAtestsystem.ItcontrolsandobservesthebehaviouroftheIUT.4.2.2UpperTester(UT)ThereisnoexplicitUTintheremotetestmethod,buttheTETRAMS-REP1DMCCandthelayersaboveinsidetheSystemUnderTest(SUT)areusedimplicitlyfortestingtheDMCClayer.4.2.3TestCo-ordinationProcedures(TCP)TheimplicitsendeventsdefinedbytheproviderofanimplementationinannexBservethepurposeoftheTCP.TheyareusedasaninputtotheIUTcommunicatingwiththeUTtoinitiatetesteventsattheDMCCprotocollayer.4.2.4PointofControlandObservation(PCO)ThePCOislocatedinsidetheprotocol.AlltesteventsatthePCOcarryingserviceuserdataisspecifiedintermsofPDUs.ThemappingofthePDUstopossibleMediumAccessControl(MAC)layerserviceprimitivesislefttothetestimplementation.5ATSconventionsThisclausedescribestheconventionsappliedtodefinethetwoATSsandgivesthenamingconventionschosenforthedifferentelementsoftheATSs.TheATSconventionsareintendedtogiveabetterunderstandingoftheATSbuttheydescribealsotheconventionsmadeforthedevelopmentoftheATS,thusforanylatermaintenancepurposesorfurtherdevelopmentoftheATS,theconventionsdescribedinthisclauseshallbeconsidered.5.1Namingconventions5.1.1DeclarationspartThissubclausedescribesthenamingconventionschosenfortheelementsoftheATSdeclarationspart.5.1.1.1TestsuitetypeandstructuredtypedefinitionsThetestsuitetypeandtestsuitestructuredtypeidentifiersdescribetheinformationelements,andeachwholewordincludedinthenameiswritteninlowercasestartingbyanuppercaseletter:EXAMPLE:Priority_Level_Typesimpletype;SSI_Typesimpletype;ITSI_Typestructuredtype.Inthecaseanabbreviationisincludedinthedeclarationname,thereisanunderscore("_")beforeand/orafterit,separatingitfromtherestoftheidentifier.Thisrulewithabbreviationsapplytoallthenamingconventionsinthewholetestsuite.5.1.1.2TestsuiteoperationsdefinitionsThetestsuiteoperationidentifiersarecomposedofstringsinuppercaselettersstartingbytheuppercasestring"TSO_".Thedifferentstringsinthedefinitionareseparatedwithunderscores.EXAMPLE:TSO_ACTIVE_IND_CALL_OCCUPATION_REP1_MS.SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)115.1.1.3TestsuiteparameterdeclarationsThetestsuiteparameteridentifiersarecomposedofstringsinuppercaselettersstartingbytheuppercasestring"PIC_"or"PIX_"andseparatedbyunderscores.IfthetestsuiteparameterreferencesaPICSitem,theprefix"PIC_"isused.EXAMPLE1:PIC_CIRCUIT_MODE_CALL.IfthetestsuiteparameterreferencesaPIXITitem,theprefix"PIX_"isused.EXAMPLE2:PIX_MS_ITSI.Completenamesasdefinedinthespecificationsareused.5.1.1.4TestcaseselectionexpressiondefinitionsThenamingconventionsforthetestcaseselectionexpressiondefinitionsusefreetextstartingwithanuppercaseletter.Thenameoftheexpressionshallexplainclearlytheselectionrule.ThetestcaseselectionexpressionsaregenerallylogicalcombinationsofthePICSelementdefinitions.5.1.1.5TestsuiteconstantdeclarationsThetestsuiteconstantidentifiersarecomposedofstringsinuppercaselettersstartingbytheuppercasestring"TSC_".EXAMPLE:TSC_RESERVED2.Completenamesasdefinedinthespecificationsareused.However,intheparametersincludingadotcharacter,thedotisreplacedbyanunderscore.5.1.1.6TestsuitevariabledeclarationsThetestsuitevariableidentifiersarecomposedofstringinlowercaselettersstartingbythelowercasestring"tsv_".Ifthetestsuitevariablerepresentsasystemparameterorvalue,thenamedefinedinthespecificationsisused.However,inthevariablesincludingadotcharacter,thedotisreplacedbyanunderscore.5.1.1.7TestcasevariabledeclarationsThetestcasevariableidentifiersarecomposedofstringsinlowercaselettersstartingbythelowercasestring"tcv_".EXAMPLE:tcv_counter.5.1.1.8PCOdeclarationsThepointofcontrolandobservationidentifiersarecomposedofthreetosixcapitalletters,beginningwithan"L",asthereareonlyLTs.EXAMPLE:LDMCCRepresentsaPCOonDMMClayerforPDUs5.1.1.9TimerdeclarationsTwokindsoftimerscanbedistinguished:1)standardized:Thosedefinedinthestandard,e.g.DT303,usethesamenameasinthestandard,beginningwithcapital"DT’.Asthereisatolerancemarginacceptedforthesetimers,twovaluesareneeded:-theminimumvalueallowed,whichwillusethesuffix"_Min";-themaximumvalueallowed,whichwillusethesuffix"_Max".SIST EN 300 394-4-5 V1.1.1:2003



ETSIETSIEN300394-4-5V1.1.1(2001-01)12EXAMPLE1:DT303_Min,DT303_Max.2)non-standardized:Thosenotdefinedinthestandard,i.e.forexecutionuse,e.g.atimerwaitingforaresponse.Thesetimersbeginwiththeprefix"T_",followedbyastringinlowercaseletterswitheachwordinthefollowingstringstartingwithanuppercas
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