SIST EN 300 248 V1.2.1:2004
(Main)Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface
- Abstract
Revision to improve the safety related text following a liaison from TC Safety. Access for any apparatus intended for connection to leased circuit.
- 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
SIST EN 300 248 V1.2.1:2004 is the Slovenian adoption of ETSI EN 300 248 V1.2.1 for a 2 048 kbit/s digital unstructured leased line (D2048U). It specifies the terminal equipment interface for connection to ONP leased lines, including the physical and electrical characteristics and the test principles used to check them. In practice, it tells equipment makers and testers what an interface must look like so terminal equipment can connect to the leased line reliably.
What does SIST EN 300 248 V1.2.1:2004 specify?
SIST EN 300 248 V1.2.1:2004 specifies the interface for terminal equipment connected to ONP 2 048 kbit/s digital unstructured leased lines using 120 Ω interfaces. The document focuses on compatibility at the network termination point and leaves customer premises wiring and installation between the terminal equipment and the Network Termination Point (NTP) outside its scope.
The document is organized into five clauses and three annexes:
| Part | What it covers |
|---|---|
| Clause 1 | Scope |
| Clause 2 | References |
| Clause 3 | Definitions |
| Clause 4 | Abbreviations |
| Clause 5 | Requirements for physical, electrical, safety-related boundary conditions, overvoltage and EMC scope limits |
| Annex A | Normative test methods |
| Annex B | Normative definition of HDB3 code |
| Annex C | Informative bibliography |
What are the key requirements of SIST EN 300 248 V1.2.1:2004?
SIST EN 300 248 V1.2.1:2004 defines a point-to-point leased line interface with a usable bitrate of 2 048 kbit/s, where timing is not supplied by the network. The user is responsible for circuit timing and for any structuring of the data. That matters because the terminal equipment must generate or recover timing correctly without expecting help from the line.
Physical connection
Clause 5.1 requires the terminal equipment to support solid conductors in the 0.4 mm to 0.6 mm range, either through direct connection contacts or through a wiring arrangement. Alternative connection means may also be provided. This is the part that affects how the equipment is cabled and what installers can actually terminate.
Output port behaviour
Clause 5.2.1 requires HDB3 coding at the output port and a pulse shape that matches the specified mask and 120 Ω test load. The output clock, when generated internally, must stay within 2 048 kbit/s ±50 ppm, and the output jitter must stay within the stated limits. In practice, this is what confirms that the interface can drive the line in a standard way.
Input port behaviour
Clause 5.2.2 requires the input port to decode HDB3 correctly, meet the specified return loss, tolerate a line with attenuation and reflections, and operate with a longitudinal voltage of 2 Vrms over 10 Hz to 30 MHz. It also requires input clock tolerance of 2 048 kbit/s ±50 ppm and defined jitter tolerance. These points matter because they describe how much distortion, imbalance and timing variation the receiver must accept without bit errors.
Grounding and implementation margin
Clause 5.2.1.4 and 5.2.2.6 require the impedance towards ground to be greater than 1000 Ω over 10 Hz to 1 MHz when the equipment has a ground. The notes link this to transformerless implementations. That gives designers a clear electrical boundary when choosing the interface circuit.
Safety boundary
Clauses 5.3 to 5.5 place safety, overvoltage and EMC requirements outside the scope of this document. The standard points users to separate safety and EMC standards. For buyers and assessors, this means conformity to this interface standard is not the same as full product safety approval.
What terms does SIST EN 300 248 V1.2.1:2004 define?
- Leased lines - Public-network telecom facilities with defined transmission characteristics between Network Termination Points and no user-controlled switching.
- Network Termination Point (NTP) - The physical connection point and its access specifications at the public network boundary.
- Terminal Equipment (TE) - Equipment intended to connect to the public telecommunications network, directly or through interworking.
- Open Network Provision (ONP) - The regulatory framework for open and efficient access to leased lines on public networks.
- D2048U - The 2 048 kbit/s digital unstructured ONP leased line covered by the standard.
- HDB3 - High Density Bipolar code of order 3, the line code used for the interface.
- PRBS - Pseudo Random Bit Sequence, used in test signals and jitter checks.
Who uses SIST EN 300 248 V1.2.1:2004?
SIST EN 300 248 V1.2.1:2004 is used by terminal equipment designers, manufacturers, test laboratories, and compliance teams working on leased-line interfaces. Network operators, telecom organizations, quality managers and buyers use it to check whether equipment can be connected to a 2 048 kbit/s unstructured leased line and how to verify that connection in testing.
What changed in SIST EN 300 248 V1.2.1:2004 from the previous edition?
SIST EN 300 248 V1.2.1:2004 follows earlier ETS 300 248 publications and an amendment history. The foreword says this version introduces necessary changes, and the introduction says it updates the safety-related text after a liaison from TC Safety.
Which standards are used with SIST EN 300 248 V1.2.1:2004?
- ITU-T Recommendation G.703 - Supplies the physical and electrical basis for hierarchical digital interfaces and the pulse shape used here.
- ITU-T Recommendation O.151 - Provides the PRBS definition and measurement context used in test methods and jitter work.
- ETSI EN 300 418 - Gives the network interface presentation for 2 048 kbit/s unstructured and structured leased lines.
- ETSI EN 300 247 - Covers connection characteristics for the 2 048 kbit/s digital unstructured leased line.
- ETSI EN 300 166 - Serves as the physical and electrical reference for hierarchical digital interfaces.
- CENELEC EN 60950 - Cited as an example safety standard for information technology equipment.
- ETSI EG 201 212 - Cited for electrical safety classification of interfaces for telecom network connection.
What does the SIST EN 300 248 V1.2.1:2004 document contain?
The document contains the interface requirements, the HDB3 code definition, and the test methods needed to check compliance. Annex A gives test configurations and procedures for signal coding, waveform shape, clock accuracy, return loss, input loss tolerance, immunity against reflections, longitudinal voltage, impedance towards ground and jitter.
It also includes the key figures, masks and tables that support those tests, including the waveform mask, the jitter limits and the return-loss values. Annex B defines HDB3 in terms of B and V pulse substitution rules. Annex C lists the bibliography used to place the standard in its regulatory and technical context.
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Frequently Asked Questions
SIST EN 300 248 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 unstructured leased line (D2048U); Terminal equipment interface". This standard covers: Revision to improve the safety related text following a liaison from TC Safety. Access for any apparatus intended for connection to leased circuit.
Revision to improve the safety related text following a liaison from TC Safety. Access for any apparatus intended for connection to leased circuit.
SIST EN 300 248 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 300 248 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 300 248 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 nestrukturirane signale (D2048U) - Vmesnik terminalske opremeAccess and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 248 Version 1.2.1SIST EN 300 248 V1.2.1:2004en01-oktober-2004SIST EN 300 248 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300248V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U);TerminalequipmentinterfaceSIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)2ReferenceREN/AT-020003Keywordsaccess,digital,leasedline,ONP,regulation,terminal,testingETSI650RoutedesLuciolesF-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 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitions.74Abbreviations.85Requirements.85.1Physicalcharacteristics.85.1.1Hardwiredconnection.95.1.2Alternativemeansofconnection.95.2Electricalcharacteristics.95.2.1Outputport.95.2.1.1Signalcoding.95.2.1.2Waveformshape.95.2.1.3Clockaccuracy.105.2.1.4Impedancetowardsground.115.2.1.5Outputjitter.115.2.1.6Outputreturnloss.115.2.1.7Outputsignalbalance.115.2.2Inputport.115.2.2.1Signalcoding.115.2.2.2Inputreturnloss.125.2.2.3Inputlosstolerance.125.2.2.4Immunityagainstreflections.125.2.2.5Tolerablelongitudinalvoltages.125.2.2.6Impedancetowardsground.125.2.2.7Inputjittertolerance.135.2.2.8Inputclocktolerance.135.3Safety.145.4Overvoltage.145.5Electro-magneticcompatibility.14AnnexA(normative):Testmethods.15A.1General.15A.1.1Additionalinformationtosupportthetest.15A.1.2Equipmentconnection.15A.2Testmethods.16A.2.1Signalcodingatoutputport.16A.2.2Waveformshapeatoutputport.16A.2.3Clockaccuracyattheoutputport.17A.2.4Returnlossatinputport.18A.2.5Inputlosstoleranceandimmunityagainstreflections.18A.2.6TolerablelongitudinalvoltageandHDB3inputcoding.20A.2.7Impedancetowardsground.21A.2.8Jitter.22AnnexB(normative):DefinitionofHDB3code.24B.1General.24B.2Definition.24SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)4AnnexC(informative):Bibliography.25History.26SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(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).ThepresentdocumentresultsfromamandatefromtheEuropeanCommissiontoprovideEuropeanstandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300247:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleaseline(D2048U);Connectioncharacteristics".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC),concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedonpublictelecommunicationsnetworksandtheavailabilitythroughouttheCommunity(EC)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthatTelecommunicationsOrganizationswithintheECshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.EN300166andITU-TRecommendationG.703[1]wereusedasthebasisfortheterminalinterface.Twocategories(voluntaryandregulatory)ofstandardwereusedfortheinterfacesofterminalequipmentdesignedforconnectiontotheONPleasedlines.TechnicalBasisforRegulations(TBRs)gavetheearlieressentialrequirementsundertheDirective91/263/EEC,laterreplacedby98/13/EC,forattachmenttotheleasedlines,whereasothervoluntarystandards(ETSsorENs)gavethefulltechnicalspecificationsfortheseinterfaces.Thisdocument,whichisbasedonanearlierETS,belongstothesecondcategory.TherequirementsofTBR12areasubsetofthepresentdocument.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)andcorrespondingtestprinciplesforaterminalequipmentinterfaceforconnectiontothenetworkterminationpointsofONP2048kbit/sdigitalunstructuredleasedlinesusing120Ωinterfaces.ThepresentdocumentistoensurethattheinterfaceoftheterminalequipmentiscompatiblewiththeONP2048kbit/sdigitalunstructuredleasedline.Itisapplicabletoallinterfacesdesignedforconnectiontotheleasedline,howeverinthecasesofapparatusthatcarriesaparticularservice,ofcomplexapparatusandofapparatusinprivatenetworks,otherrequirementsmayapplyinadditiontothepresentdocument.CustomerpremiseswiringandinstallationbetweentheterminalequipmentandtheNetworkTerminationPoint(NTP)areoutsidethescopeofthepresentdocument.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationG.703(1998):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[2]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".3DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:Leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccessto,andefficientcommunicationthrough,thatpublicnetworkTerminalEquipment(TE):equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:a)tobeconnecteddirectlytotheterminationofapublictelecommunicationsnetwork;orb)tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation.SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)84AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:D2048U2048kbit/sdigitalunstructuredONPleasedlineDCDirectCurrentEMCElectro-MagneticCompatibilityHDB3HighDensityBipolarcodeoforder3(seeannexB)NTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBS(215-1)PseudoRandomBitSequence(asdefinedinclause2.1ofITU-TRecommendationO.151[2])rmsrootmeansquareRXReceive(asignalinputateithertheterminalequipmentinterfaceorthetestequipment)SDHSynchronousDigitalHierarchyTETerminalEquipmentTXTransmit(asignaloutputateithertheterminalequipmentinterfaceorthetestequipment)UIUnitInterval5RequirementsThe2048kbit/sunstructuredleasedlineprovidesabidirectionalpoint-to-pointdigitalleasedlinewithausablebitrateof2048kbit/swheretimingisnotprovidedfromthenetwork.Theprovisionofcircuittimingistheresponsibilityoftheuser.Nostructuringofthedataisprovidedbythenetworkandanystructuringistheresponsibilityoftheuser.5.1PhysicalcharacteristicsCurrentlynostandardizedconnectorisreadilyavailable.Consequently,theonlymethodofconnectionthatcanbespecifiedinthepresentdocumentistheuseofsolidconductorsof0,4mmto0,6mm.ThepresentdocumentrequirestheTEtobecapableofpresentingeitherapointfortheattachmentofunterminatedsolidconductors,orsolidconductorsthemselves(seeclause5.1.1).ItisarequirementthatsuchaconnectionmethodbeavailabletobeprovidedforusewiththeTEifnecessary.Inordertoallowconnectiontobemadeusingothermethods(e.g.connectors),theTEispermittedtobesuppliedwithaconnectionmethodsuitableforusewiththosemethods(seeclause5.1.2).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.SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)9Figure1NOTE2:TheuseofashieldedcordorcablemaybenecessarytomeetradiationandimmunityrequirementsdefinedinElectroMagneticCompatibility(EMC)standards.5.1.1HardwiredconnectionRequirement:Theterminalequipmentshallprovide:a)asetofconnectioncontacts(e.g.aninsulationdisplacementconnectororascrewterminalblock)towhichsolidwireconductorswithdiametersintherange0,4mmto0,6mmmaybeconnected;orb)awiringarrangementconnectedbyanymeanstotheterminalequipment,withunterminatedsolidwireconductorswithdiametersintherange0,4mmto0,6mmattheenddistantfromtheterminalequipment.Test:Thereisnotest.Allsubsequenttestsarecarriedoutviathespecifiedconnectionmethod.5.1.2AlternativemeansofconnectionAnyalternativemeansofconnectionmaybeprovidedinadditiontotheconnectionarrangementsunderclause5.1.1.5.2Electricalcharacteristics5.2.1Outputport5.2.1.1SignalcodingRequirement:CodingofthedigitalsignaltransmittedattheoutputportshallbeinaccordancewithHighDensityBipolarcodeoforder3(HDB3)encodingrules(seeannexB).Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.1.5.2.1.2WaveformshapeRequirement:Thepulseattheoutputportshallcomplywiththerequirementsgivenintable1andfigure2,basedonITU-TRecommendationG.703[1].Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.2.Table1:WaveformshapeatoutputportPulseshape(nominallyrectangular)Allmarksofavalidsignalshallconformwiththemask(seefigure2)irrespectiveofthepolarity.ThevalueVcorrespondstothenominalpeakvoltageofamark.Testloadimpedance120Ω non-reactiveNominalpeakvoltageVofamark3VPeakvoltageofaspace0±0,3VNominalpulsewidth244nsRatiooftheamplitudesofpositiveandnegativepulsesatthecentreofthepulseinterval0,95to1,05Ratioofthewidthsofpositiveandnegativepulsesatthenominalhalfamplitude0,95to1,05INPUTINPUTOUTPUTOUTPUTTXNETWORKINTERFACETXTERMINALEQUIPMENTSIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)10269ns194ns(244-50)=100%50%0%10%10%10%10%20%244ns219ns(244-25)488ns(244+244)Nominalpulse20%20%10%10%(244+25)Figure2:Pulsemaskfor2048kbit/spulse5.2.1.3ClockaccuracyRequirement:WhereaTerminalEquipment(TE)hasaninternalclock,intheabsenceofanyexternalreferencesignaltiming,theoutputportshallhaveabitrateof2048kbit/s±50ppm.Test:ThetestshallbeconductedaccordingtoannexA,clauseA.2.3.SIST EN 300 248 V1.2.1:2004
ETSIETSIEN300248V1.2.1(2001-07)115.2.1.4ImpedancetowardsgroundRequirement:Wheretheterminalequipmenthasaground,theimpedancetowardsgroundoftheoutputportshallbegreaterthan1000Ωforfrequenciesintherange10Hzto1MHzwhenmeasuredwithasinusoidaltestvoltageof2Vrms.Forthepurposeofthisrequirement,groundshallbetheterminalequipm
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