SIST EN 300 420 V1.2.1:2004
(Main)Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Terminal equipment interface
General Information
- Abstract
Revision to improve the safety related text following a liaison from TC Safety. Specification of the terminal equipment side of the interface and test procedures for compliance.
- Status
- Published
- Publication Date
- 30-Sep-2004
- Technical Committee
- SPN - Services and Protocols for Networks
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Oct-2004
- Due Date
- 01-Oct-2004
- Completion Date
- 01-Oct-2004
- Mandate
- T-147-2
Overview
SIST EN 300 420 V1.2.1:2004 is a Slovenian standard developed by the Slovenski inštitut za standardizacijo (SIST) and aligned with the European standard EN 300 420 from ETSI. It specifies the interface requirements for terminal equipment connected to 2 048 kbit/s digital structured leased lines (D2048S), a common rate for digital data transmission across public telecommunications networks. The standard aims to ensure interoperability and compatibility for access and terminals (AT), with updated safety-related text in accordance with feedback from technical committees.
This standard outlines the essential physical and electrical characteristics, test principles, and compliance procedures for terminal equipment interfaces connected at the Network Termination Point (NTP) in line with Open Network Provision (ONP) requirements.
Key Topics
- Terminal Equipment Interface: Specifies physical and electrical requirements for equipment at the user end of a 2 048 kbit/s digital structured leased line.
- Physical Characteristics: Defines connection methods, such as hardwired connections for solid conductors of specific diameter or alternative connector arrangements, ensuring robust physical compatibility.
- Electrical Specifications: Cover essential aspects like signal coding (using HDB3), waveform shape, output timing, impedance to ground, jitter, return loss, and input tolerance.
- Test Procedures for Compliance: Provides a framework for testing compliance with interface requirements, supporting interoperability in multi-vendor environments.
- Safety, Overvoltage, and EMC Guidance: Although detailed requirements for safety, overvoltage, and electromagnetic compatibility (EMC) are outside the document's scope, references to applicable standards are supplied for comprehensive compliance.
- Frame and Multiframe Structures: Outlines bitstream and frame alignment rules, including handling of cyclic redundancy checks (CRC-4) and specific bits (E-bits, A-bit, Sabits) within the protocol for error and status reporting.
Applications
SIST EN 300 420 V1.2.1:2004 is relevant to a variety of practical scenarios in telecommunications:
- Telecommunications Equipment Manufacturing: Ensures that terminal devices (routers, multiplexers, PBXs) meet required interface specifications for deployment on leased lines operating at 2 048 kbit/s.
- Network Design and Integration: Facilitates seamless integration of terminal equipment from different suppliers by specifying how devices should interface at the NTP, promoting robust and reliable digital connectivity.
- Public and Private Network Deployments: Applies to both public telecom network access points and, where applicable, complex or private apparatus requiring standardized connectivity and performance.
- Regulatory Compliance: Assists network operators and equipment providers in meeting international and European regulatory requirements related to access and terminals for leased digital lines.
- Testing and Certification: Provides test principles for validation and certification of terminal devices, reducing interoperability issues during commissioning and maintenance.
Related Standards
For comprehensive implementation and compliance, SIST EN 300 420 V1.2.1:2004 should be used together with the following related standards and recommendations:
- EN 300 418: Network interface presentation for 2 048 kbit/s digital leased lines (both structured and unstructured).
- EN 300 419: Connection characteristics for 2 048 kbit/s digital structured leased lines.
- ITU-T Recommendation G.703: Physical and electrical characteristics of hierarchical digital interfaces.
- ITU-T Recommendation G.704: Synchronous frame structures used at various hierarchical digital levels.
- ITU-T Recommendations O.151 and O.171: Equipment and methods for measuring error performance and timing/jitter characteristics.
- EN 60950 (CENELEC): Safety of information technology equipment.
- EG 201212, ROBT-002 (CENELEC): Guidance on interface safety categories.
Adherence to this standard assures compatibility, reliability, and regulatory conformity for terminal equipment in digital leased line networks throughout Slovenia and in line with broader European best practices.
Get Certified
Connect with accredited certification bodies for this standard
ANCE
Mexican certification and testing association.
Intertek Slovenia
Intertek testing, inspection, and certification services in Slovenia.
LNE (Laboratoire National de Métrologie et d'Essais)
French national laboratory for metrology and testing.
Sponsored listings
Frequently Asked Questions
SIST EN 300 420 V1.2.1:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Terminal equipment interface". This standard covers: Revision to improve the safety related text following a liaison from TC Safety. Specification of the terminal equipment side of the interface and test procedures for compliance.
Revision to improve the safety related text following a liaison from TC Safety. Specification of the terminal equipment side of the interface and test procedures for compliance.
SIST EN 300 420 V1.2.1:2004 is classified under the following ICS (International Classification for Standards) categories: 33.040.50 - Lines, connections and circuits. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 420 V1.2.1:2004 is associated with the following European legislation: Standardization Mandates: T-147-2. 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 300 420 V1.2.1:2004 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.Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 2 048 kbit/s in za strukturirane signale (D2048S) - Vmesnik terminalske opremeAccess and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 420 Version 1.2.1SIST EN 300 420 V1.2.1:2004en01-oktober-2004SIST EN 300 420 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300420V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);TerminalequipmentinterfaceSIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)2ReferenceREN/AT-020007Keywordsdigital,leasedline,network,ONP,terminalETSI650RoutedesLuciolesF-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.©EuropeanTelecommunicationsStandardsInstitute2001.Allrightsreserved.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.84Requirements.94.1Physicalcharacteristics.94.1.1Hardwiredconnection.104.1.2Alternativemeansofconnection.104.2Electricalcharacteristics.104.2.1Outputport.104.2.1.1Signalcoding.104.2.1.2Waveformshape.104.2.1.3Outputtiming.114.2.1.4Impedancetowardsground.124.2.1.5Outputjitter.124.2.1.6Outputreturnloss.124.2.1.7Outputsignalbalance.124.2.1.8Outputstructure.124.2.1.8.1CRC-4.134.2.1.8.2UseoftheE-bits.134.2.1.8.3UseoftheA-bit.134.2.1.8.4UseoftheSabits.144.2.2Inputport.144.2.2.1Signalcoding.144.2.2.2Inputreturnloss.144.2.2.3Inputlosstolerance.144.2.2.4Immunityagainstreflections.154.2.2.5Tolerablelongitudinalvoltages.154.2.2.6Impedancetowardsground.154.2.2.7Inputjittertolerance.154.2.2.8Inputclocktolerance.164.2.2.9Inputframestructure.164.2.2.9.1Framealignment.164.2.2.9.2Multiframealignment.174.3Safety.174.4Overvoltage.174.5ElectroMagneticCompatibility(EMC).17AnnexA(normative):Testmethods.18A.1General.18A.1.1Additionalinformationtosupportthetest.18A.1.2Equipmentconnection.18A.2Testmethods.19A.2.1Signalcodingattheoutputport.19A.2.2Waveformshapeatoutputport.19A.2.3Outputtiming.20A.2.4Returnlossatinputport.21A.2.5Inputlosstoleranceandimmunityagainstreflections.21SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)4A.2.6Tolerablelongitudinalvoltage,HDB3inputcoding.23A.2.7Impedancetowardsground.24A.2.8Inputandoutputjitter.24A.2.9Framestructure.26A.2.9.1OutputstructureandCRC-4generation.26A.2.9.2TerminalsnotusingtheE-bits.27A.2.9.3TerminalsusingtheE-bitstoindicateerroredSMFs.27A.2.9.4UseoftheA-bit.28A.2.10Inputframestructure.29A.2.10.1Framealignment.29A.2.10.2Multiframealignment.30AnnexB(normative):DefinitionofHDB3code.32B.1General.32B.2Definition.32AnnexC(normative):Definitionofframestructure.33C.1Framestructure.33C.2CRC-4.33C.2.1CRC-4generation.34C.2.2CRC-4monitoring.34AnnexD(normative):RequirementsTable(RT).35AnnexE(informative):Timingsynchronization.37E.1General.37E.1.1Usertiming.37E.1.2Networktiming.37E.2Furtherinformation.38AnnexF(informative):Bibliography.39History.40SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)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)hasbeenproducedbyETSITechnicalCommitteeAccessandTerminals(AT).ThepresentdocumentresultsfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.Twocategories(voluntaryandregulatory)ofstandardwereusedfortheinterfacesofterminalequipmentdesignedforconnectiontotheONPleasedlines.TechnicalBasisforRegulations(TBRs)gavetheearlieressentialrequirementsundertheDirective91/263/EEC,laterreplacedby98/13/EC,forattachmenttotheleasedlines,whereasothervoluntarystandards(ETSsorENs)gavethefulltechnicalspecificationsfortheseinterfaces.Thisdocument,whichisbasedonanearlierETS,belongstothesecondcategory.TherequirementsofTBR13areasubsetofthepresentdocument.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ETS300166andITU-TRecommendationsG.703[1],G.704[2]andG.706wereusedasthebasisfortheterminalinterfaceaspectsofthepresentdocument.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects),thenecessaryfunctionalcharacteristicsandthecorrespondingtestprinciplesforaterminalequipmentinterfaceforconnectiontotheNetworkTerminationPoints(NTPs)ofOpenNetworkProvision(ONP)2048kbit/sdigitalstructuredleasedlinesusing120Ωinterfaceswithaninformationtransferrateof1984kbit/swithoutrestrictiononbinarycontent.ThepresentdocumentistoensurethattheinterfaceoftheterminalequipmentiscompatiblewiththeONP2048kbit/sdigitalstructuredleasedline.AterminalequipmentinterfacethatconformstothepresentdocumentwillalsobecompatiblewithanONP2048kbit/sunstructuredleasedline.Thepresentdocumentisapplicabletoallinterfacesdesignedforconnectiontotheleasedline,howeverinthecasesofapparatusthatcarriesaparticularservice,ofcomplexapparatusandofapparatusinprivatenetworks,otherrequirementsmayapplyinadditiontothepresentdocument.CustomerpremiseswiringandinstallationbetweentheterminalequipmentandtheNTPareoutsidethescopeofthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationG.703(1998):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[2]ITU-TRecommendationG.704(1998):"Synchronousframestructuresusedat1544,6312,2048,8448and44736kbit/shierarchicallevels".[3]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[4]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".[5]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".[6]ETSIEN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:erroredSub-MultiFrame:Sub-MultiFrame(SMF)wherethecalculatedCyclicRedundancyCheck-4bit(CRC-4)doesnotcorrespondwiththeCRC-4containedwithinthenextSMF(seeclauseC.2.2)frame:sequenceof256bitsofwhichthefirst8bitsdefinetheframestructure(seeannexC)leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweenNTPsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)multiframe:sequenceoftwoSMFscontainingthemultiframealignmentword(seeannexC)NetworkTerminationPoint(NTP):physicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkPRBS(215-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.1ofITU-TRecommendationO.151[3])Sabits:bits4to8(bitsSa4toSa8)inframesnotcontainingtheframealignmentsignal(seeannexC)Sub-Multiframe(SMF):sequenceof8frames,eachof256bits,overwhichtheCRC-4iscalculated(seeannexC)terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation.3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmIndicationSignalAMIAlternateMarkInversionCRC-4CyclicRedundancyCheck-4bitD2048S2048kbit/sdigitalstructuredleasedlinedcdirectcurrentEMCElectroMagneticCompatibilityHDB3HighDensityBipolarcodeoforder3(seeannexB)ISDNIntegratedServicesDigitalNetworkNTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequenceRAIRemoteAlarmIndicationrmsrootmeansquareRTRequirementsTableRXRXisasignalinput(ateithertheterminalequipmentinterfaceorthetestequipment,seefigure1)SDHSynchronousDigitalHierarchySMFSub-MultiFrameTXTXisasignaloutput(ateithertheterminalequipmentinterfaceorthetestequipment,seefigure1)UIUnitIntervalSIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)94RequirementsTheterminalequipmentinterfaceisforusewith2048kbit/sstructuredleasedlinesthatprovidebi-directional,point-to-pointdigitalconnectionswithaninformationtransferrateof1984kbit/swithoutrestrictiononbinarycontent.Anystructuringofthedatawithinthetransparent1984kbit/spartoftheframeistheresponsibilityoftheuser.4.1PhysicalcharacteristicsCurrentlynostandardizedconnectorisreadilyavailable.Consequently,theonlymethodofconnectionthatcanbespecifiedinthepresentdocumentistheuseofsolidconductorsof0,4mmto0,6mm.Thepresentdocumentrequirestheterminalequipmenttobecapableofpresentingeitherapointfortheattachmentofunterminatedsolidconductors,orsolidconductorsthemselves(seeclause4.1.1).Itisarequirementthatsuchaconnectionmethodbeavailabletobeprovidedforusewiththeterminalequipmentifnecessary.Inordertoallowconnectiontobemadeusingothermethods(e.g.connectors),theterminalequipmentispermittedtobesuppliedwithaconnectionmethodsuitableforusewiththosemethods(seeclause4.1.2).NOTE1:Thefollowingareexamplesofarrangementsthatcomplywiththerequirements.Thelistbelowshouldnotberegardedasanexhaustivelistofallpermittedarrangements:a)acord,permanentlyconnectedtotheterminalequipmentatoneendandunterminatedattheotherend,withwiresthataresolidconductorswithdiametersintherange0,4mmto0,6mm;b)acord,connectedviaaplugandsockettotheterminalequipmentatoneendandunterminatedattheotherend,withwiresthataresolidconductorswithdiametersintherange0,4mmto0,6mm;c)aninsulationdisplacementconnector,designedtoacceptwireswithsolidconductorswithdiametersintherange0,4mmto0,6mm,butwithnocord;d)ascrewconnector,designedtoacceptwireswithsolidconductorswithdiametersintherange0,4mmto0,6mm,butwithnocord;e)thearrangementinb)plusoneormoreadditionalalternativecordswiththesameplugorsocketarrangementattheterminalendandanyplugorsocketattheotherend;f)thearrangementinc)ord)plusoneormorecordssuitableforconnectiontotheterminalequipmentatoneendandanyplugorsocketattheotherend.Thetransmitpairistheoutputfromtheterminalequipmentinterface.Thereceivepairistheinputtotheterminalequipmentinterface,asshowninfigure1.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertotheterminalequipmentinterface.NetworkInterfaceTXRXRXTXTerminalEquipmentOutputInputOutputInputFigure1NOTE2:TheuseofashieldedcordorcablemaybenecessarytomeetradiationandimmunityrequirementsdefinedinElectroMagneticCompatibility(EMC)standards.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)104.1.1HardwiredconnectionRequirement:theterminalequipmentshallprovide:a)asetofconnectioncontacts(e.g.aninsulationdisplacementconnectororascrewterminalblock)towhichsolidwireconductorswithdiametersintherange0,4mmto0,6mmmaybeconnected;orb)awiringarrangementconnectedbyanymeanstotheterminalequipment,withunterminatedsolidwireconductorswithdiametersintherange0,4mmto0,6mmattheenddistantfromtheterminalequipment.Test:thereisnotest.Allsubsequenttestsarecarriedoutviathespecifiedconnectionmethod.4.1.2AlternativemeansofconnectionAnyalternativemeansofconnectionmaybeprovidedinadditiontotheconnectionarrangementsunderclause4.1.1.4.2Electricalcharacteristics4.2.1Outputport4.2.1.1SignalcodingRequirement:thesignaltransmittedattheoutputportshallcomplywiththeHighDensityBipolarcodeoforder3(HDB3)encodingrules(seeannexB).Test:thetestshallbeconductedaccordingtoclauseA.2.1.4.2.1.2WaveformshapeRequirement:thepulseattheoutputportshallcomplywiththerequirementsgivenintable1andfigure2,basedonITU-TRecommendationG.703[1].Table1:WaveformshapeatoutputportPulseshape(nominallyrectangular)Allmarksofavalidsignalshallconformtothemask(seefigure2)irrespectiveofthepolarity.ThevalueVcorrespondstothenominalpeakvoltageofamark.Testloadimpedance120Ωnon-reactiveNominalpeakvoltageVofamark3VPeakvoltageofaspace0±0,3VNominalpulsewidth244nsRatiooftheamplitudesofpositiveandnegativepulsesatthecentreofthepulseinterval0,95to1,05Ratioofthewidthsofpositiveandnegativepulsesatthenominalhalfamplitude0,95to1,05SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)11269ns194ns(244-50)V=100%50%0%10%10%10%10%20%244ns219ns(244-25)488ns(244+244)Nominalpulse20%20%10%10%(244+25)Figure2:Pulsemaskfor2048kbit/spulseTest:thetestshallbeconductedaccordingtoclauseA.2.2.4.2.1.3OutputtimingThisrequirementissuchthattheterminalequipmentiscapableofoperatingwhenconnectedtoleasedlinescapableofcarryingusertimingwithintherange2048kbit/s±50partspermillion(ppm)andwhenconnectedtoleasedlinesthatprovidetimingthatissynchronoustothenetworktiming.ForfurtherinformationseeannexE.Requirement:theterminalequipmentshallhave:a)aninternalclockwhichshallprovideabitrateattheoutputportwithinthelimitsof2048kbit/s±50ppm;andb)thecapabilitytoprovideaclockloopsuchthatthesignaltimingattheoutputportisderivedfromthetimingattheinputport.Theterminalequipmentmayalsohave:c)anexternalreferencesignalinputfromwhichtheoutputtimingmaybederived.Test:forcasea)thetestshallbeconductedaccordingtoclauseA.2.3.Thecapabilitytoprovideaclockloop,caseb),andthederivationofaclocksignalfromanexternalreferencesignalinput,casec),arecoveredbythetestofclauseA.2.8.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)124.2.1.4ImpedancetowardsgroundRequirement:wheretheterminalequipmenthasaground,theimpedancetowardsgroundoftheoutputportshallbegreaterthan1000Ωforfrequenciesintherange10Hzto1MHzwhenmeasuredwithasinusoidaltestvoltageof2Vrootmeansquare(rms).Forthepurposeofthisrequirement,groundshallbetheterminalequipmentcommonreferencepointortestreferencepoint.NOTE:Thisrequirementisincludedtoallowtransformerlessimplementations.Test:thetestshallbeconductedaccordingtoclauseA.2.7.4.2.1.5OutputjitterRequirement:thepeak-to-peakoutputjittershallnotexceedthelimitsoftable2whenmeasuredwithabandpassfilterwithlinearcut-offwiththedefinedcut-offfrequencies.Atfrequenciesbelowthelower3dBpoint,theattenuationofthehighpassfiltershallrisewithavalueequalto20dBperdecade.Atfrequenciesabovetheupper3dBpoint,theattenuationofthelowpassfiltrationshallrisewithavaluegreaterthan,orequalto,60dBperdecade.Forthepurposeoftesting,anysignalinputfromwhichtheoutputtimingisderivedshallbeprovidedwiththemaximumtolerableinputjitter,andwiththemaximumtolerableinputfrequencydeviation,asspecifiedbythemanufacturer.Wheretheoutputtimingoftheterminalequipmentistakenfromtheleasedline,theinputtotheterminalequipmentshallbeprovidedwithcomponentsofsinusoidaljitteratpointsonthecurveoffigure3andtable4.NOTE:Aseparaterequirementforoutputjitteratfrequenciesbelow40Hzisnotrequiredbecausethemeasurementfilterwithafirstorderlowercut-offwillallowthejittertohaveaspectrumwhoseamplituderisesat20dB/decadeasthefrequencyreducesbelow40Hz.Wheretimingistakenfromtheleasedline,thetestusesinputjitterfrequenciesfrom20Hzupwards.Table2:MaximumoutputjitterMeasurementfilterbandwidthOutputjitterLowercut-off(highpass)Uppercut-off(lowpass)UnitInterval(UI)peak-to-peak(maximum)40Hz100kHz0,11UITest:thetestshallbeconductedaccordingtoclauseA.2.8.4.2.1.6OutputreturnlossTherearenorequirementsforoutputreturnlossunderthepresentdocument.NOTE:Arequirementforoutputreturnlossmaybeaddedtothepresentdocumentwhenappropriatespecificationsbecomeavailable.4.2.1.7OutputsignalbalanceTherearenorequirementsforoutputsignalbalanceunderthepresentdocument.NOTE:TheeffectsoftheoutputsignalimbalancearecoveredundertheEMCDirective(89/336/EEC).4.2.1.8OutputstructureRequirement:thebitstreamtransmittedattheoutputoftheterminalequipmentshallbestructuredasdefinedinclauseC.1.Test:thetestshallbeconductedaccordingtoclauseA.2.9.1.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)134.2.1.8.1CRC-4Requirement:theCRC-4bitstransmittedattheoutputoftheterminalequipmentshallbeasdefinedintablesC.1andC.2andclauseC.2.1ofannexCandshallcorrespondtothedatatransmittedattheoutputoftheterminalequipment.Test:thetestshallbeconductedaccordingtoclauseA.2.9.1.4.2.1.8.2UseoftheE-bitsTheterminalequipmentshallcomplyeitherwithclause4.2.1.8.2.1orclause4.2.1.8.2.2.4.2.1.8.2.1TerminalsnotusingtheE-bitsThisclauseisapplicabletothoseterminalequipmentswhichdonotusetheE-bitstoindicateerroredSMFs.Requirement:bothE-bitstransmittedattheoutputoftheterminalequipmentshallbesettobinaryONEinallinstances.Test:thetestshallbeconductedaccordingtoclauseA.2.9.2.4.2.1.8.2.2TerminalsusingtheE-bitstoindicateerroredSMFsThisclauseisapplicabletothoseterminalequipmentswhichusetheE-bitstoindicateerroredSMFs.Requirement:theE-bitstransmittedattheoutputoftheterminalequipmentshallindicateerroredSMFsintheinputbitstream.OneE-bitinamultiframeshallbesettobinaryZEROforeacherroredSMFreceivedintheinputbitstream.TheE-bitscorrespondingtonon-erroredSMFsshallbesettobinaryONE.AnydelaybetweenthedetectionofanerroredSMFandthesettingoftheE-bitthatindicatestheerroredSMFshallbelessthan1second.Test:thetestshallbeconductedaccordingtoclauseA.2.9.3.4.2.1.8.3UseoftheA-bitTheterminalequipmentshallcomplyeitherwithclause4.2.1.8.3.1orclause4.2.1.8.3.2.4.2.1.8.3.1TerminalsnotusingtheA-bitRequirement:theA-bittransmittedattheoutputoftheterminalequipmentshallbesettobinaryZEROinallinstances.Test:thetestshallbeconductedaccordingtoclauseA.2.9.4.4.2.1.8.3.2TerminalsusingtheA-bitRequirement:theA-bittransmittedattheoutputoftheterminalequipmentshallbesettobinaryZEROinnormaloperationbutmaybechangedfrombinaryZEROtobinaryONEwithin30msofanyofthefollowingconditionsoccurringintheinputbitstream:a)threeconsecutiveincorrectframealignmentsignals,(thecorrectframealignmentsignalisdefinedintableC.1);b)therebeing=915erroredSMFsoutof1000SMFs.TheterminalmayalsochangetheA-bitfrombinaryZEROtobinaryONEwithin30msof:c)bit2inframesnotcontainingtheframealignmentsignalbeinginerror(i.e.bit2isabinaryZERO)onthreeconsecutiveoccasions.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)14Foraterminalequipmentrecoveringfromlossofframealignment(i.e.theA-bitsettobinaryONE)theA-bittransmittedattheoutputoftheterminalequipmentshallbesetfrombinaryONEtobinaryZEROwithin30msofanyofthefollowingconditionsoccurringintheinputbitstream:d)forthefirsttime,thepresenceofthecorrectframealignmentsignal(asdefinedintableC.1);ande)theabsenceoftheframealignmentsignalinthefollowingframedetectedbyverifyingthatbit2ofthebasicframeisabinaryONE;andf)forthesecondtime,thepresenceofthecorrectframealignmentsignalinthenextframe.Test:thetestshallbeconductedaccordingtoclauseA.2.9.4.4.2.1.8.4UseoftheSabitsThereisnorequirementonthevalueorsettingoftheSabitsattheoutputoftheterminalequipment.4.2.2Inputport4.2.2.1SignalcodingRequirement:theinputportshalldecodewithouterrorHDB3encodedsignalsinaccordancewithHDB3encodingrules(seeannexB).Test:thetestshallbeconductedaccordingtoclauseA.2.6.4.2.2.2InputreturnlossRequirement:theinputreturnlosswithrespectto120Ωattheinterfaceshallbegreaterthanorequaltothevaluesgivenintable3,whichistakenfromclause9.3ofITU-TRecommendationG.703[1].Table3:InputportminimumreturnlossFrequencyrangeReturnloss51kHzto102kHz102kHzto2048kHz2048kHzto3072kHz12dB18dB14dBTest:thetestshallbeconductedaccordingtoclauseA.2.4.4.2.2.3InputlosstoleranceRequirement:theinputportshalldecodewithouterrorsa2048kbit/ssignalasdefinedinclauses4.2.1.1and4.2.1.2abovebutmodifiedbyacableorartificialcablewiththefollowingcharacteristics:a)attenuationthatfollowsa¹flawwithvaluesthroughouttherange0to6dBat1024kHz;andb)characteristicimpedanceof120Ωwithatoleranceof±20%inthefrequencyrangefrom200kHzupto,butnotincluding,1MHz,and±10%at1MHz.Test:thetestshallbeaccordingtoclauseA.2.5.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)154.2.2.4ImmunityagainstreflectionsRequirement:whenasignalcomprisingacombinationofanormalsignalandaninterferingsignalisappliedtotheinputport,viaanartificialcablewithalossintherange0dBto6dBat1MHz,noerrorsshallresultduetotheinterferingsignal.ThenormalsignalshallbeasignalencodedaccordingtoHDB3,shapedaccordingtothemaskoffigure2,withabinarycontentinaccordancewithaPRBS(215-1).Theinterferingsignalshallbethesameasthenormalsignalexceptthatthelevelisattenuatedby18dB,thebitrateiswithin2048kbit/s±50ppmandthetimingshallnotbesynchronizedtothenormalsignal.Test:thetestshallbeconductedaccordingtoclauseA.2.5.4.2.2.5TolerablelongitudinalvoltagesRequirement:thereceivershalloperatewithouterrorswithanyinputsignalinthepresenceofalongitudinalvoltageofmagnitude2Vrmsoverthefrequencyrange10Hzto30MHz.NOTE:Thisrequirementisincludedtoallowtransformerlessimplementations.Test:thetestshallbeconductedaccordingtoclauseA.2.6.4.2.2.6ImpedancetowardsgroundRequirement:wheretheterminalequipmenthasaground,theimpedancetowardsgroundoftheinputportshallbegreaterthan1000Ωforfrequenciesintherange10Hzto1MHzwhenmeasuredwithasinusoidaltestvoltageof2Vrms.Forthepurposeofthisrequirement,groundshallbetheterminalequipmentcommonreferencepointortestreferencepoint.NOTE:Thisrequirementisincludedtoallowtransformerlessimplementations.Test:thetestshallbeconductedaccordingtoclauseA.2.7.4.2.2.7InputjittertoleranceRequirement:theterminalequipmentshalltolerateatitsinputportthemaximuminputjitterasshownintable4andfigure3.NOTE:Terminalequipmentwithmorethanoneinputwillnormallyneedtobedesignedwithawanderbufferofatleast18µs,however,toaccommodatethewanderthatmaybeproducedbySynchronousDigitalHierarchy(SDH)networks,upto40µsmaybeneeded.Table4:InputjittertolerancePeak-to-peakamplitude(UI)Frequency(Hz)A1A2f1f2f3f41,50,220240018000100000SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)16peak-to-peakjitterpeak-to-peakjitterjitterfrequencyjitterfrequencyf1f1f2f2f3f3f4f4A1A1A2A2Figure3:InputjittertoleranceTest:thetestshallbeconductedaccordingtoclauseA.2.8.4.2.2.8InputclocktoleranceRequirement:theterminalequipmentshalldecodewithouterrorHDB3encodedsignalsoverthefrequencyrange2048kbit/s±50ppm.Test:thetestshallbeconductedinaccordancewithclauseA.2.8.4.2.2.9Inputframestructure4.2.2.9.1FramealignmentRequirement:theinputportshallacceptaninputbitstreamwithaframeandmultiframestructureasdefinedinannexC.Theterminalequipmentshallbecapableofachievingframealignmentinordertoseparatetheuserdatafromtheframeinformation.Framealignmentshallbeachievedfollowing:a)forthefirsttime,thepresenceofthecorrectframealignmentsignal;andb)theabsenceoftheframealignmentsignalinthefollowingframedetectedbyverifyingthatbit2ofthebasicframeisabinaryONE;andc)forthesecondtime,thepresenceofthecorrectframealignmentsignalinthenextframe,providedthatthedatadoesnotcontainanysimulatedframealignmentwords.Theterminalequipmentshallcontinuetomaintainframealignmentintheeventofreceivingoneortwoconsecutiveincorrectframealignmentsignals.Onreceiptofthreeconsecutiveincorrectframealignmentsignalstheterminalequipmentshallconsiderframealignmenttohavebeenlostandinitiateasearchforframealignment.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)17Framealignmentmayalsobeconsideredtohavebeenlostfollowing:d)theoccurrenceof=915erroredSMFsoutof1000SMFs;ore)bit2inframesnotcontainingtheframealignmentsignalbeinginerroronthreeconsecutiveoccasions;orf)theinabilitytoachievemultiframealignmentwithin8ms(seeclause4.2.2.9.2).Test:thetestshallbeconductedinaccordancewithclauseA.2.10.1.4.2.2.9.2MultiframealignmentThisrequirementisoptionalandappliesonlytothoseterminalequipmentsneedingtoobtainmultiframealignmentinordertoextractCRC-4informationinordertocomplywithclause4.2.1.8.2.2.Requirement:CRC-4multiframealignmentshallbeachievedifatleasttwovalidCRC-4multiframealignmentsignalscanbelocatedwithin8ms(thetimeseparatingtwoCRC-4multiframealignmentsignalsbeing2msoramultipleof2ms).Ifmultiframealignmentcannotbeachievedwithin8msitshallbeassumedthatframealignmentisduetoaspuriousframealignmentsignalandaresearchforframealignmentshallbeinitiated.NOTE:Theresearchforframealignmentshouldbestartedatapointjustafterthelocationoftheassumedspuriousframealignmentsignal.Thiswillusuallyavoidrealignmentontothespuriousframealignmentsignal.Test:thetestshallbeconductedinaccordancewithclauseA.2.10.2.4.3SafetyRequirementsforsafetyareoutsidethescopeofthepresentdocument.SafetystandardsarepublishedbyCENELEC.NOTE1:AnexampleofsuchaCENELECproductsafetystandardisEN60950(seeannexF).NOTE2:Forsafetycategoriesofinterfaces,seeEG201212.ThisdocumentisalsoavailablefromCENELECasROBT-002.NOTE3:Designersshouldtakeintoaccounttheminimumimpedancetowardsgroundspecifiedinthepresentdocument.4.4OvervoltageOvervoltageaspectsareoutsideofthescopeofthepresentdocument.4.5ElectroMagneticCompatibility(EMC)EMCrequirementsareoutsidethescopeofthepresentdocument.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)18AnnexA(normative):TestmethodsA.1GeneralThisannexdescribesthetestprinciplestodeterminethecomplianceofaterminalequipmentagainsttherequirementsofthepresentdocument.Itisoutsidethescopeofthepresentdocumenttoidentifythespecificdetailsoftheimplementationofthetests.Aterminalequipmentmaybedesignedforthrough-connectingandmayfulfiltheelectricalrequirementsonlyifthrough-connected.Inthesecasestherequirementsofthepresentdocumentarevalidandthetestsshallbecarriedoutwiththethrough-connectionterminatedasspecifiedbythemanufacturer.Detailsoftestequipmentaccuracyandthespecificationtoleranceofthetestdevicesarenotincludedinallcases.Wheresuchdetailsareprovidedtheyshallbecompliedwith,butthewaytheyareexpressedshallnotconstrainthemethodofimplementingthetest.NOTE:Attentionisdrawntotheissueofmeasurementuncertaintywhichmaybeaddressedinfuturedocuments.Notalltherequiredtestresultsmakeallowanceforspuriouseventsduringtesting(e.g.errorsduetoEMCeffects),whichmaymakeitnecessarytorepeatatest.Thetestconfigurationsgivendonotimplyaspecificrealizationoftestequipmentortestarrangement,ortheuseofspecifictestdevicesforconformancetesting.However,anytestconfigurationusedshallprovidethosetestconditionsspecifiedunder"interfacestate","stimulus"and"monitor"foreachindividualtest.Thetestequipmentshallbeadevice,oragroupofdevices,thatiscapableofgeneratingastimulussignalconformingtothepresentdocumentandcapableofmonitoringthesignalreceivedfromtheinterface.A.1.1AdditionalinformationtosupportthetestThefollowingfacilitiesshallbeprovidedbytheterminalequipmentinterfaceundertest:a)anabilitytoconfiguretheterminalequipmentsuchthatitprovidesatransparentloopbackoftheinputtotheoutput;andb)anabilitytotransmitagivenbitpattern,e.g.PRBS(215-1),withinthe1984kbit/suserchannel.Wherea)orb)cannotbeprovided,theterminalequipmentsuppliershallprovideanalternativemeansofperformingthetest.NOTE:WhereterminalsequipmentsusetheE-bitstoindicateerroredSMFs,thismaybeusedasanalternativetoatransparentloopbackinordertodetermineifdataattheinputhasbeencorrectlyreceived.A.1.2EquipmentconnectionThetestsinthepresentdocumentshallbecarriedoutusingtheconnectionmethodsuitableforusewithunterminatedsolidconductorsasdefinedinclause4.1.1.However,inthecaseofthetestsspecifiedinclausesA.2.2,A.2.4andA.2.7,analternativemethodofconnectionmaybeprovidedbytheterminalequipmentsupplierfortestpurposes.Inthiscase,thismethodofconnectionshallbeusedforthesetestsbecausetherequirementconsidersanywiringtobepartoftheinstallationcabling.NOTE:ThisalternativemethodofconnectionisfortestpurposesonlyandhasbeenintroducedbecausethecharacteristicstestedinclausesA.2.2,A.2.4andA.2.7arebasedonITU-TRecommendationG.703[1]whichmakesnoallowanceforadditionalwiring.Thisalternativemethodmaynotbethesameasthealternativemethodofconnectionreferredtoinclause4.1whichisforoperationaluse.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)19A.2TestmethodsOnetestmaycovermorethanonerequirement.Thescopeofeachtestisdefinedundertheheading"purpose".A.2.1SignalcodingattheoutputportPurpose:toverifythatthesignalcodingattheterminalequipmentoutputportcomplieswiththeHDB3codingrulesasrequiredbyclause4.2.1.1.Testconfiguration(seefigureA.1):TestEquipmentTXRXRXTXTerminalEquipmentFigureA.1:SignalcodingInterfacestate:powered.Stimulus:theterminalequipmentshalltransmitaHDB3bitstreamaccordingtotheframestructureofannexC.Thebinarycontentofthedatacontainedinbits9to256oftheframeshallbeabitstreamincludingthesequences<0000><0000>and<0000><0000>,where0=spaceand1=markinputtotheHDB3encoder,(seenote).Monitor:theoutputbitstreamforatestperiodofsufficienttimetoallowtransmissionof100occurrencesoftheabovepatternsplusthelatencyperiodoftheerrordetectionmechanism.Results:thereshallbenoerrorsinthedecodedbitstream.NOTE:Apseudorandombitstream,e.g.PRBS(215-1),willbeacceptableifthebitpatternsoftheaboveclauseareincludedinthebitstream.A.2.2WaveformshapeatoutputportPurpose:toverifyconformanceoftheoutputwaveformshapewiththerequirementsofclause4.2.1.2.Testconfiguration(seefigureA.2):MeasuringEquipmentTTerminalEquipmentTXT=TerminatingResistor120Ω ± 0,25%FigureA.2:WaveformshapeatoutputportSIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)20Interfacestate:powered.Stimulus:undefined.Monitor:-marksandspacestransmittedbytheterminalequipment,measuringtheamplitudeandshapeofpositiveandnegativepulses(measuredatthecentreofthepulseinterval)andthetimedurationofpositiveandnegativepulses(measuredatthenominalhalfofthepulseamplitude,i.e.1,5V);-theoverallmeasurementaccuracyshallbebetterthan90mV.Allthemeasurementsshallbeperformedusingmeasuringequipmentcapableofrecordingdirectcurrent(dc).Abandwidthof200MHzorgreatershallbeusedtoensurethecaptureofoverorundershootofthepulse.Results:-bothpositiveandnegativepulsesshallbewithinthemaskoffigure2,whereV=100%shallbe3V;-thebitintervalcorrespondingtoaspaceshallnotpresentvoltageshigherthan±0,3V;-theratiobetweentheamplitudeofpositiveandnegativepulsesshallbecontainedintherangefrom0,95to1,05;-theratiobetweenthepulsewidthsofpositiveandnegativepulsesshallbeintherangefrom0,95to1,05.A.2.3OutputtimingPurpose:toverifythebitrateiswithinthelimitsof2048kbit/s±50ppmwhentheterminalequipmentisgeneratingtimingfromaninternalclock,clause4.2.1.3.Testconfiguration(seefigureA.3):-theterminalequipmentshallbeconfiguredtoprovideoutputtimingfromtheinternalclocksource.TheterminalequipmentoutputshallbeanyHDB3encodedbitstream.TerminalEquipmentTXTestEquipmentRXFrequencyCounterExtractedClockFigureA.3:OutputtimingInterfaceState:powered.Stimulus:undefined.Monitor:thebitratefromtheterminalequipmentoutputport.Results:thebitrateshallbewithinthelimitsof2048kbit/s±50ppm.SIST EN 300 420 V1.2.1:2004
ETSIETSIEN300420V1.2.1(2001-07)21A.2.4ReturnlossatinputportPurpose:toverifythatthereturnlossofthereceivepairoftheterminalequipmentinterfacecomplieswiththerequirementsofclause4.2.2.2.Testconfiguration(seefigureA.4):RXBridgeTGeneratorVoltmeterT=TerminatingResistor120Ω ± 0,25%TerminalEquipmentFigureA.4:ReturnlossatinputportInterfacestate:powered.Stimulus:sinusoidalsignalof3Vpeakattheinputtotheterminalequipmentwithafrequencyvariablebetween51kHzand3072kHz.Monitor:voltagemeasuredacrossthebridge,representingaterminatingresistorof120Ω,usingaselectivevoltmeterwithabandwidthoflessthan1kHz.Results:themeasuredreturnlossshallbegreaterthanorequaltothevaluesintable3ofclause4.2.2.2.NOTE:Thecharacteristicsofthegeneratorandofthevoltmetermaybedifferentdependingontheimplementationofthebridge,however,thetotalerrorofthetestset-upshouldbelessthan0,5dBintherangebetween10dBand20dB.Whenconnectedtoa120Ω±0,25%resistorthemeasuredreturnlossofthebridgeshouldbe20dBhigherthanthelimitsspecifiedfortheinterface.A.2.5InputlosstoleranceandimmunityagainstreflectionsPurpose:tochecktheinputportimmunityagainstaninterferingsignalcombinedwiththeinputsignal,asspecifiedinclause4.2.2.4,bothwithoutcable(i.e.0dBattenuationloss)andwithacableattenuationof6dB,asspecifiedinclause4.2.2.3.Testconfiguration(seefigureA.5):-theinterferingsignalshallbecombinedwiththemainsignalinacombiningnetworkofimpedance120Ω,withzerodBlossinthemainpathandanattenuationintheinterferencepathof18dB;-thecablesimulatorshallhaveanattenuationof6dBmeasuredat1024kHzandanattenuationcharacteristicthatfollowsa¹flawoverthefrequencyrange100kHzto10MHz;-theconformanceoftheinterfaceshallbeverifiedinthefollowingtestconditions:a)withoutcablesimulatorandwithoutinterferingsignal;andb)withcablesimulatorandwithoutinterferingsignal;andc)withoutcablesimulatorandwithinterferingsignal;andd)withcablesimulatorandwithinterferingsignal.-thetestshallberepeatedwiththewiresattheterminalequipmentinterfaceinput(RX)reversed.SIST EN 300 420
...