SIST EN 300 449 V1.2.1:2004

• Abstract:

  Specification of the public network side of the interface and the performance of the leased line service, including test procedures for compliance. Revision of ETS 300 449 to improve the safety related text following a liaison received from TC Safety.

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• 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
• Ref Project: ETSI EN 300 449 V1.2.1 (2001-07) - Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation

SIST EN 300 449 V1.2.1:2004 is the SIST version of the ETSI standard for Access and Terminals (AT) special quality voice bandwidth 2-wire analogue leased line (A2S). It specifies the public-network side of the interface, the performance limits for the leased line service, and the test principles used to check those limits. It is intended for network operators, leased-line providers, test laboratories, and terminal equipment designers working at the Network Termination Point (NTP).

What does SIST EN 300 449 V1.2.1:2004 specify?

SIST EN 300 449 V1.2.1:2004 specifies the technical requirements and test principles for the connection characteristics and the physical and electrical characteristics of the network interface presentation for special quality, voice bandwidth, 2-wire, analogue leased lines. The scope excludes safety, overvoltage and Electro Magnetic Compatibility (EMC) aspects.

The standard applies to leased lines, including part-time leased lines, where setup and release do not require protocol exchange or other intervention at the NTP. It is organized into clauses on scope, references, definitions, requirements, and five annexes. Annex A contains the normative test methods; Annexes B, C and D are informative; Annex E is a bibliography.

Annex	What it covers
Annex A	Normative test methods for connection characteristics and interface presentation
Annex B	Informative weighted return loss measurements
Annex C	Informative background on overall loss and quantizing distortion
Annex D	Informative availability assessment and example figures
Annex E	Bibliography

What are the key requirements of SIST EN 300 449 V1.2.1:2004?

SIST EN 300 449 V1.2.1:2004 defines a bidirectional, point-to-point line with nominally symmetrical characteristics in each direction. In practice, this means the service is planned as a pairwise leased connection, and each direction is checked separately.

• Overall loss, Clause 4.1.2 - The loss at 1020 Hz is limited to a defined range. This is the basic end-to-end attenuation check and helps buyers judge whether the line will carry the intended signal level.
• Loss/frequency distortion, Clause 4.1.3 - The line must stay within specified loss limits across the voice band, with limits referenced to 1020 Hz. This matters when the application uses data or tones that must survive the whole 300 Hz to 3400 Hz band evenly.
• Transmission signals, Clause 4.1.4 - The line must handle a mean input power of -9 dBm in the voice band and a higher short-term instantaneous level of +4 dBm. This tells users what signal levels the service should carry without clipping or overload.
• Transmission delay and group delay distortion, Clauses 4.1.5 and 4.1.6 - Delay is constrained, with a distance-related limit for terrestrial routes and a 350 ms cap where satellite transmission is involved. Group delay distortion is limited relative to the minimum delay in the 500 Hz to 2800 Hz range, which matters for data integrity and waveform shape.
• Noise, jitter and distortion, Clauses 4.1.8 to 4.1.14 - The standard limits random circuit noise, impulsive noise, phase jitter, quantizing distortion, total distortion, single tone interference, frequency error and harmonic distortion. These limits are the main checks for transmission quality in service and for test acceptance.
• Echo and stability, Clause 4.1.15 - Echocontrol devices are not to be used, talker echo and listener echo are limited, and the line must remain stable over 0 Hz to 4000 Hz for all terminating conditions. This matters for both speech usability and predictable data transmission.
• Interface presentation and power feeding, Clause 4.2 - The network interface normally uses the ISO/IEC 8877 8-contact socket, with a hardwired presentation available on request, and it must not feed power to or require power from terminal equipment. This helps installers choose the correct physical termination and avoid powering assumptions.

What terms does SIST EN 300 449 V1.2.1:2004 define?

• Group delay - The propagation time through the leased line at a given frequency, expressed through phase shift versus angular frequency.
• Group delay distortion - The difference between group delay at a given frequency and the minimum group delay in the frequency band of interest.
• Leased lines - Public network facilities that provide defined transmission characteristics between network termination points without user-controlled switching.
• Network Termination Point (NTP) - The physical connection point and technical access specification that forms part of the public telecommunications network.
• Reference impedance (ZR) - A complex impedance made from 270 Ω in series with 750 Ω in parallel with 150 nF.
• Quantizing distortion unit (qdu) - A unit for distortion caused by conversion between analogue and digital forms.
• Voice bandwidth - The 300 Hz to 3400 Hz frequency range used by the service.

Who uses SIST EN 300 449 V1.2.1:2004?

SIST EN 300 449 V1.2.1:2004 is used by leased-line providers, public network operators, and terminal equipment manufacturers when they define, provision, and test A2S connections. Test laboratories use it to set up compliance tests for loss, delay, noise, return loss, jitter, distortion, and power feeding. It is also useful for buyers and quality managers comparing leased-line offers or checking whether a service fits a data or voice application.

What changed in SIST EN 300 449 V1.2.1:2004 from the previous edition?

SIST EN 300 449 V1.2.1:2004 revises ETS 300 449. The stated change is an update to improve the safety-related text following a liaison from TC Safety.

Which standards are used with SIST EN 300 449 V1.2.1:2004?

The standard uses ITU-T Recommendation O.71 for impulsive noise measurement, O.81 for group delay measurement, O.91 for phase jitter measurement, O.95 for phase and amplitude hit counting, O.132 for quantizing distortion measurement, and O.41 for psophometric noise measurement. ISO/IEC 8877 provides the connector type used for the socket interface. ETSI EN 300 450 is the companion standard for the terminal equipment interface, and the bibliography also points to ITU-T and CENELEC documents used for context.

What does the SIST EN 300 449 V1.2.1:2004 document contain?

The document contains one normative annex with detailed test setups, including reference impedance, non-reactive line termination, measurement frequency tolerance, and specific arrangements for loss, delay, noise, jitter, distortion, return loss, and power-feeding tests. It also includes figures for the test connections and formulas for return loss and weighted return loss. Annex C explains how overall loss and quantizing distortion arise in real networks, with examples of access networks and qdu build-up. Annex D gives a practical view of availability assessment, including unavailability periods and example availability figures.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); Special quality voice bandwidth 2-wire analogue leased line (A2S); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 449 Version 1.2.1SIST EN 300 449 V1.2.1:2004en01-oktober-2004SIST EN 300 449 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300449V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Specialqualityvoicebandwidth2-wireanalogueleasedline(A2S);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)2ReferenceREN/AT-010002KeywordsONP,leasedlineETSI650RoutedesLuciolesF-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 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.51Scope.62References.63Definitions,symbolsandabbreviations.73.1Definitions.73.2Symbolsandabbreviations.74Requirements.84.1Connectioncharacteristics.84.1.1Tabulationofconnectioncharacteristics.84.1.2Overallloss.94.1.3Loss/frequencydistortion.94.1.4Transmissionsignals.104.1.4.1Maximummeaninputpower.104.1.4.2Maximuminstantaneouspower.104.1.4.3Maximumpowerina10Hzbandwidth.104.1.4.4Maximuminputpoweroutsidethevoiceband.104.1.5Transmissiondelay.104.1.6Groupdelaydistortion.114.1.7Variationofoveralllosswithtime.124.1.7.1Amplitudehits.124.1.7.2Othervariations.124.1.8Randomcircuitnoise.124.1.9Impulsivenoise.134.1.10Phasejitter.134.1.11Distortion.134.1.11.1Quantizingdistortion.134.1.11.2Totaldistortion.134.1.12Singletoneinterference.134.1.13Frequencyerror.144.1.14Harmonicdistortion.144.1.15Echoandstability.144.1.15.1Echo.144.1.15.1.1Echocontroldevices.144.1.15.1.2Talkerecho.144.1.15.1.3Listenerecho.144.1.15.2Stability.144.2Interfacepresentation.144.2.1Connectorspecification.154.2.2Hardwiredpresentation.154.2.3Returnloss.154.2.4Powerfeeding.164.3Safety.164.4Overvoltage.164.5ElectroMagneticCompatibility(EMC).164.6Availability.16AnnexA(normative):Testmethods.17A.1General.17A.1.1Equipmentconnection.17A.1.2Referenceimpedance.17A.1.3Non-reactivelinetermination.18SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)4A.1.4Measurementfrequency.18A.2Testmethods.18A.2.1Overallloss.18A.2.2Loss/frequencydistortionandmaximummeaninputpower.19A.2.3Maximuminstantaneouspower.19A.2.4Groupdelaydistortion.20A.2.5Amplitudehits.20A.2.6Randomcircuitnoise.21A.2.7Impulsivenoise.21A.2.8Phasejitter.22A.2.9Totaldistortion.22A.2.10Singletoneinterference.23A.2.11Frequencyerror.23A.2.12Harmonicdistortion.24A.2.13Stability.24A.2.14Returnloss.25A.2.15Powerfeeding.26AnnexB(informative):Weightedreturnlossmeasurements.27B.1Introduction.27B.2Weightingfunction.27B.2.1Calculation(trapezoidalrule).27B.2.2Calculation(tabulateddata).28AnnexC(informative):Overalllossandquantizingdistortion.29C.1Introduction.29C.2Overallloss.30C.3Quantizingdistortion.31AnnexD(informative):Availability.32D.1General.32D.1.1Unavailability.32D.1.2Availability.32D.2Definitionofunavailabilityperiods.32D.3Availabilityfigures.34AnnexE(informative):Bibliography.35History.36SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(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).ThepresentdocumentresultedfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforsupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Thereisanotherstandarddirectlyrelatedtothepresentdocument:-EN300450:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)(seeannexE)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlineswithinandbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexE),laterreplacedby98/13/EC(seeannexE),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationM.1020(seeannexE)wasusedasthebasisfortheconnectioncharacteristics.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandthephysicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfacepresentationofspecialquality,voicebandwidth,2-wire,analogueleasedlines,providedaspartoftheminimumsetundertheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)(seeannexE).AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocumentalthoughinpracticetheoverallperformancemaybeconsiderablybetter.Theleasedlineprovidesaccesstothevoicebandwidth(300Hzto3400Hz)withnorestrictionsontheuseofthefrequencies.Therequirementsofthepresentdocumenthavebeenchosenprimarilyforthetransmissionofdatabetweenterminalequipmentswithoutequalizersalthoughthereisnorestrictionontheuseoftheleasedlineforothertypesoftraffic.Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thetestsspecifiedinthepresentdocumentcannotbecarriedout,norcanperformancebemonitoredbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryinguser'straffic.Thusthetestsaredesignedforbringingintoandreturningintoservicealthoughthereisnoobligationtoperformthesetestseachtimetheleasedlineisbroughtintoorreturnedintoservice.Thepresentdocumentcoversthephysical,mechanicalandelectricalcharacteristicsofthenetworkinterfaceandspecifiestheconformancetestsfortheconnectioncharacteristicsandnetworkinterface.Someofthetestsdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationO.71(1988):"Impulsivenoisemeasuringequipmentfortelephone-typecircuits".[2]ITU-TRecommendationO.81(1988):"Group-delaymeasuringequipmentfortelephone-typecircuits".[3]ITU-TRecommendationO.91(1988):"Phasejittermeasuringequipmentfortelephone-typecircuits".[4]ITU-TRecommendationO.95(1988):"Phaseandamplitudehitcountersfortelephone-typecircuits".[5]ITU-TRecommendationO.132(1988):"Quantizingdistortionmeasuringequipmentusingasinusoidaltestsignal".SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)7[6]ISO/IEC8877(1992):"Informationtechnology.Telecommunicationsandinformationexchangebetweensystems.InterfaceconnectorandcontactassignmentsforISDNBasicAccessInterfacelocatedatreferencepointsSandT".[7]ITU-TRecommendationO.41(1994):"Psophometerforuseontelephone-typecircuits".[8]ETSIEN300450:"AccessandTerminals(AT);OrdinaryandSpecialqualityvoicebandwidth2-wireanalogueleasedlines(A2OandA2S);Terminalequipmentinterface".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:groupdelay:measureofthepropagationtimethroughtheleasedline.Foragivenfrequencyitisequaltothefirstderivativeofthephaseshiftthroughtheleasedline,measuredinradians,withrespecttotheangularfrequencymeasuredinradianspersecondgroupdelaydistortion:differencebetweengroupdelayatagivenfrequencyandminimumgroupdelay,inthefrequencybandofinterestleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkreferenceimpedanceZR:compleximpedancemadeupofaresistanceof270Ωinserieswithaparallelcombinationof750Ωand150nF.SeealsoclauseA.1.2terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationnetwork;i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationnetwork,inordertosend,process,orreceiveinformation.voicebandwidth:bandoffrequenciesovertherange300Hzto3400Hz3.2SymbolsandabbreviationsForthepurposesofthepresentdocument,thefollowingsymbolsandabbreviationsapply:aReturnlossindBaf()ReturnlossatfrequencyfindBawWeightedreturnlossindBAf()ReturnlossatfrequencyfexpressedasaratioA2SSpecialqualityvoicebandwidth2-wireanalogueleasedlineADPCMAdaptiveDifferentialPulseCodedModulationEMCElectroMagneticCompatibilityffrequencyNTPNetworkTerminationPointONPOpenNetworkProvisionSIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)8qduquantizingdistortionunitrmsrootmeansquareZRReferenceimpedance4Requirements4.1ConnectioncharacteristicsThespecialqualityvoicebandwidth2-wireanalogueleasedlineisabidirectionalline,configuredpoint-to-point,nominallycoveringthevoicebandwidth.Theconnectionis,ingeneral,symmetrical,i.e.eachdirectionoftransmissionhasthesamenominalcharacteristics,althoughtheactualvaluesareindependent.4.1.1TabulationofconnectioncharacteristicsTheparametersdefiningthecharacteristicsoftheconnectionaregivenintable1.Thesecharacteristicsdefinetheserviceoffered.Table1:NetworkperformancecharacteristicsDescriptionNatureReferenceclauseOverallloss0≤overallloss≤17dB4.1.2Loss/frequencydistortiontable2,figure14.1.3Transmissionsignals-maximummeaninputpower-maximuminstantaneouspower-maximumpowerina10Hzbandwidth-maximuminputpoweroutsidevoiceband-9dBm+4dBmnorequirementnorequirement4.1.44.1.4.14.1.4.24.1.4.34.1.4.4Transmissiondelay-terrestrial(fordistanceGinkilometres)-viasatellite<(15+0,01G)ms<350ms4.1.5Groupdelaydistortiontable3,figure34.1.6Variationofoveralllosswithtime-amplitudehits-othervariations≤10ina15minuteperiod±4dBofthatat1020Hz4.1.74.1.7.14.1.7.2Randomcircuitnoise<-41dBm0p(seenote)4.1.8Impulsivenoise≤18peaks≥-21dBm0ina15minuteperiod(seenote)4.1.9Phasejitter≤10°peaktopeak4.1.10Totaldistortion-quantizingdistortion-totaldistortion≤3qdu;noADPCM>28dBsignaltodistortionratio4.1.114.1.11.14.1.11.2Singletoneinterference≤-44dBm0(seenote)4.1.12Frequencyerror≤±5Hz4.1.13Harmonicdistortion≥25dBbelowfundamental4.1.14Echoandstability-Echocontroldevices-Talkerecho-Listenerecho-Stabilitynoechocontrol>10dB>20dB0to4kHz4.1.154.1.15.1.14.1.15.1.24.1.15.1.34.1.15.2NOTE:Wheretheoutputrelativelevelisnotdefined,analternativevalueisspecifiedinthereferenceclause.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)94.1.2OveralllossRequirement:Theoverallloss,includinglongtermvariations,presentedtoasignalfrequencyof1020Hzsentatapowerlevelof-9dBmineachdirectionoftransmissionwiththelineterminatedin600Ωateachendshallbeintherange:0≤overallloss≤17dBNOTE:Theoveralllossineachdirectioncanbedifferent.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3Loss/frequencydistortionRequirement:Theoveralllossrelativetothatdefinedinclause4.1.2abovefortheconnection,presentedtoasignalsentatapowerlevelof-9dBmwiththelineterminatedin600Ωateachendshallliebetweenthelimitsgivenintable2andfigure1.Below300Hzandabove3600Hztherelativelossshallnotbelessthan-2dBand0dBrespectively,butisotherwiseunspecified.Table2:Limitsforlossofthecircuitrelativetothatat1020HzUpperlimitLowerlimitPoint(seefigure1)FrequencyHzRelativelossdBPoint(seefigure1)FrequencyHzRelativelossdBA3006G500-2B5006H500-1C5003I2800-1D28003J2800-2E28006K3600-2F30006L36000300500FrequencyHz0-1-236RelativelossdB2800360030001020ABCDEFGHIJKLFigure1:Limitsforlossofthecircuitrelativetothatat1020HzTest:ThetestshallbeconductedaccordingtoclauseA.2.2.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)104.1.4Transmissionsignals4.1.4.1MaximummeaninputpowerRequirement:Theleasedlineshallbecapableofcarryinganysignalpresentedattheinputataoneminutemeanpowerlevelof-9dBmwithinavoicebandwidthof300Hzto3400Hzwiththelineterminatedin600Ωateachend.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.4.2MaximuminstantaneouspowerRequirement:Theleasedlineshallbecapableofcarryingasignalattheinputhavingamaximumvalueequaltoaninstantaneouspowerwhichis13dBabovethemeanvalueof-9dBm(i.e.+4dBm).NOTE:ThisvalueisbaseduponaprovisionalITU-Tvalue.SeeITU-TRecommendationV.2(seeannexE).Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.4.3Maximumpowerina10HzbandwidthThereisnorequirementformaximumpowerina10Hzbandwidth.NOTE:However,thereisacorrespondingrequirementontheterminalequipmentspecifiedinEN300450[8].4.1.4.4MaximuminputpoweroutsidethevoicebandNOTE:Theleasedlineinterfaceisnotsuitableforthehandlingofsignalsbelow300Hzandabove3400Hz.Outofbandsignalsfromtheterminalequipmentarelimitedtoavoidtroubleinthenetwork(seeterminalequipmentinterfacerequirementinEN300450[8]).4.1.5TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolvedtheonewayend-to-enddelayshallbelessthan(15+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure2;orb)forconnectionswheresatellitetransmissionisinvolvedtheonewayend-to-enddelayshallbelessthan350ms.NOTE:Requirementsa)andb)arebasedonclausesA.2andA.3ofITU-TRecommendationG.114(seeannexE)withsuitableadjustmenttorequirementa)toallowforthepossibleuseofloadedcable.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)11Delay(ms)Geographicaldistance(km)100090003000600010015Figure2:UpperlimitofdelayTest:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.6GroupdelaydistortionRequirement:Theconnectionshallconformtothelimitsforgroupdelaydistortiongivenintable3andfigure3inwhichthelimitingvaluesoverthefrequencybandareexpressedasvaluesrelativetotheminimummeasuredgroupdelayinthe500Hzto2800Hzfrequencyband.NOTE:Figure3isbasedonfigure2ofITU-TRecommendationM.1020(seeannexE).Table3:Limitsforgroupdelayrelativetotheminimummeasuredgroupdelayinthe500Hzto2800HzbandUpperlimitPoint(seefigure3)FrequencyHzGroupdelaydistortionmsA5003,0B6003,0C6001,5D10001,5E10000,5F26000,5G26003,0H28003,0SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)12300500FrequencyHz2800260001234Groupdelaydistortionms56001000ABCDEFGHFigure3:Limitsforgroupdelayrelativetotheminimummeasuredgroupdelayinthe500Hzto2800HzbandTest:ThetestshallbeconductedaccordingtoclauseA.2.4.4.1.7Variationofoveralllosswithtime4.1.7.1AmplitudehitsRequirement:WhenmeasurementsaremadeusinganinstrumentcomplyingwithITU-TRecommendationO.95[4]withthesendlevelsetat-9dBmatafrequencyof1020Hz,thenumberofamplitudehitsgreaterthan±2dBshallnotexceed10inany15minutemeasuringperiod.NOTE:Phaseoramplitudehitsaredefinedassuddenpositiveornegativechangesinphaseoramplitudeofanobservedtestsignalwhichexceedaspecifiedthresholdandpersistforaperiodoftimegreaterthanaspecifiedduration.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.1.7.2OthervariationsRequirement:Foraparticularimplementationvariationswithtimeoftheoveralllossat1020Hz(includingdailyandseasonalvariationsbutexcludingamplitudehits)shallnotexceed±4dBvariationfromthevalueestablishedbythetestforoverallloss,seeclause4.1.2.Anysuchvariationshallnotresultinanoveralllossgreaterthanthemaximumspecifiedinclause4.1.2.Test:Thereisnotestforthisbuttherecordoftheresultsofsuccessivetestsofoveralllossmaybeusedtocheckcompliance.ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.8RandomcircuitnoiseRequirement:Thelevelofthepsophometricnoisepowerattheoutputoftheleasedlineshallbelessthan-41dBm0p.Inorderthatthisparametercanbetested,theleasedlineprovidershoulddeclaretheplannedvalueoftheoutputrelativeleveloftheleasedline.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)13Wheretheoutputrelativeleveleitherisnot,orcannotbe,declaredbytheleasedlineprovider,thepsophometricallyweightedrandomcircuitnoiselevelshallbe28dBbelowareceivedtestsignalwhichissentatalevelof-9dBmatafrequencyof1020Hzintothefarendoftheleasedline.Test:ThetestshallbeconductedaccordingtoclauseA.2.6.4.1.9ImpulsivenoiseRequirement:Withaninputsignallevelof-9dBmappliedatafrequencyof1020Hztotheinputoftheleasedline,thereshallnotbemorethan18impulsivenoisepeaksexceedingathresholdlevelof-21dBm0withinaperiodof15minutes.Inorderthatthisparametercanbetested,theleasedlineprovidershoulddeclaretheplannedvalueoftheoutputrelativeleveloftheleasedline.Wheretheoutputrelativeleveleitherisnot,orcannotbe,declaredbytheleasedlineprovider,thethresholdlevelshallbe8dBbelowthereceivedsignallevel.Thus,ifasignallevelof-9dBmisappliedattheinputandthelinelossis17dBthenthereceivedsignallevelwillbe-26dBmandthethresholdforimpulsivenoisepeakswillbe-34dBm.Test:ThetestshallbeconductedaccordingtoclauseA.2.7.4.1.10PhasejitterRequirement:Thephasejittershallbelessthanorequalto10ºpeak-to-peakwhenmeasuredatafrequencyof1020Hz.Test:ThetestshallbeconductedaccordingtoclauseA.2.8.4.1.11Distortion4.1.11.1QuantizingdistortionRequirement:Thequantizingdistortionshallnotexceed3quantizingdistortionunit(qdu).Moreover,AdaptiveDifferentialPulseCodedModulation(ADPCM)systemsshallnotbeused.NOTE:Insomecases(e.g.internationalleasedlinesspanningseveraltransitcountries,particularnetworkconfigurations)anallocationof4qdumaybeneeded.Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.11.2TotaldistortionRequirement:Withaninputpowerlevelof-9dBmappliedatafrequencyof1020Hztotheinputoftheleasedline,thesignaltototaldistortionratioshallbegreaterthan28dB.Test:ThetestshallbeconductedaccordingtoclauseA.2.9.4.1.12SingletoneinterferenceRequirement:Thepowerlevelofsingletoneinterferenceintheband300Hzto3400Hzshallnotexceed-44dBm0,thatis3dBlessthanthepermittednoisepowerlevel(seeclause4.1.8).Inorderthatthisparametercanbetested,theleasedlineprovidershoulddeclaretheplannedvalueoftheoutputrelativeleveloftheleasedline.Wheretheoutputrelativeleveleitherisnot,orcannotbe,declaredbytheleasedlineprovider,thepowerlevelofanysingletoneshallbe31dBbelowareceivedtestsignalwhichissentatalevelof-9dBmatafrequencyof1020Hzintothefarendoftheleasedline.Test:ThetestshallbeconductedaccordingtoclauseA.2.10.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)144.1.13FrequencyerrorRequirement:Thefrequencyerrorintroducedbytheconnectionshallbelessthanorequalto±5Hzwhenmeasuredatafrequencyof1020Hz.Test:ThetestshallbeconductedaccordingtoclauseA.2.11.4.1.14HarmonicdistortionRequirement:Whena700Hztestfrequencyof-9dBmisinjectedattheinputoftheleasedline,thelevelofanyindividualharmonicfrequencyattheoutputshallbeatleast25dBbelowthereceivedlevelofthefundamentalfrequency.Test:ThetestshallbeconductedaccordingtoclauseA.2.12.4.1.15Echoandstability4.1.15.1Echo4.1.15.1.1EchocontroldevicesRequirement:Inordertofacilitatedatatransmission,echocontroldevicesshallnotbeusedintheconnection.Test:Thereisnotest.Thisrequirementshallbecheckedusinginformationfromthenetworkplans.4.1.15.1.2TalkerechoRequirement:Withaninputsignallevelof-9dBminthefrequencyrange300Hzto3600Hzappliedattheinterface,withasourceimpedanceof600Ω,anycompositeechosignalreceivedatthenearendinterfaceshallbegreaterthan10dBbelowthesignalleveltransmittedintotheinterface(i.e.<-19dBm).Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.15.1.3ListenerechoRequirement:Withaninputsignallevelof-9dBminthefrequencyrange300Hzto3600Hzappliedattheinterface,withasourceimpedanceof600Ω,anycompositeechosignalreceivedatthefarendinterfaceshallbegreaterthan20dBbelowthereceivedlevelofthefundamentalsignal.Test:Thereisnotest.Thisrequirementshallbecheckedbycalculationusinginformationfromthenetworkplans.4.1.15.2StabilityRequirement:Anyleasedlineshallbestableoverthefrequencyrange0Hzto4000Hzforallterminatingconditions.NOTE:Theterm"allterminatingconditions"includesopenandshortcircuitandhighimpedanceterminations.Test:ThetestshallbeconductedaccordingtoclauseA.2.13.4.2InterfacepresentationThephysicalconnectionarrangementsshallnormallybebyasocketasspecifiedinclause4.2.1;howeveratthespecificrequestoftheusertheconnectionarrangementsspecifiedinclause4.2.2shallbeprovided.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)154.2.1ConnectorspecificationRequirement:Thenetworkinterfaceshallprovidean8-contactsocketofthetypespecifiedinISO/IEC8877[6]andwithcontactassignmentsasspecifiedintable4.Table4:ContactassignmentsContactnumberNetworkinterface1Unused2Unused3Unused4&5Pair6Unused7Unused8UnusedTest:Thereshallbeavisualinspectionthatthesocketisofthecorrecttype.ThecontactassignmentsaretestedindirectlythroughthetestsinannexA.4.2.2HardwiredpresentationRequirement:Thenetworkinterfaceshallprovideasetofconnectioncontacts(e.g.aninsulationdisplacementconnectororascrewterminalblock)towhichsolidconductorswithwirediametersintherange0,4mmto0,6mmmaybeconnected.Theleasedlineprovidershallprovideinformationontheconfigurationoftheconnectioncontactsusedforeachleasedlineinterface.Test:Thereshallbeavisualinspectionthattheconnectionmethodprovidedissuitablefortakingsolidconductorsasdefinedintherequirementandthatinformationontheconfigurationisprovided.NOTE:Allsubsequenttestsarecarriedoutviatheappropriateconnectionmethod.4.2.3ReturnlossRequirement:Thereturnlosspresentedbythenetworkinterfaceagainstthereferenceimpedance,whenthefarendinterfaceoftheconnectionisterminatedbythereferenceimpedance,shalleitherbe:-greaterthan6dBoverthefrequencyrange300Hzto3400Hzwhenmeasuredwithavoltageequivalenttoasignalpowerlevelattheinputtotheleasedlineof-9dBmat1020Hz;or-ifthereturnlossisnotgreaterthan6dBatallfrequencies,thentheweightedreturnlossagainstthereferenceimpedanceshallbegreaterthan6dBoverthefrequencyrange300Hzto3400Hz,whenmeasuredwithavoltageequivalenttoasignalpowerattheinputtotheleasedlineof-9dBmat1020Hz.Theweightedreturnlossawshallbegivenby:aAffdfw=−385103003400,log()dBwhereAfaf()()=−1010andaf()isthemeasuredreturnlossatfrequencyfexpressedindB.Test:ThetestshallbeconductedaccordingtoclauseA.2.14.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)164.2.4PowerfeedingRequirement:Thenetworkinterfaceshallnotfeedpowertotheterminalequipmentinterfaceandshallnotrequirepowerfromtheterminalequipmentinterface.Test:ThetestforpoweroutputfromthenetworkinterfaceshallbeconductedaccordingtoclauseA.2.15.ThetestfortherequirementnottosupportpowerfeedingfromtheterminalinterfaceistestedindirectlythroughthevarioustestsofannexAsincenopowerissuppliedoverthenetworkinterfacefromthetestequipment.4.3SafetyRequirementsforsafetyareoutsidethescopeofthepresentdocument.SafetystandardsarepublishedbyCENELEC.NOTE1:AnexampleofsuchaCENELECproductsafetystandardisEN60950(seeannexE).NOTE2:Forsafetycategoriesofinterfaces,seeEG201212(seeannexE).ThisdocumentisalsoavailablefromCENELECasROBT-002.4.4OvervoltageOvervoltageaspectsareoutsideofthescopeofthepresentdocument.4.5ElectroMagneticCompatibility(EMC)EMCrequirementsareoutsidethescopethepresentdocument.4.6AvailabilityThereisnorequirementonavailabilityunderthepresentdocument.NOTE1:AnnexDprovidesinformationaboutavailabilityvaluesforanalogueleasedlines.NOTE2:Atpresentsomeleasedlineprovidersincludeavailabilityperformance,definedonanindividualbasisasaqualityofserviceparameter,aspartofthecontractedsupplyconditionsfortheirleasedlineofferings.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)17AnnexA(normative):TestmethodsA.1GeneralThisannexdescribesthetestprinciplestobeusedtodeterminethecomplianceofaleasedlineconnectionandnetworkinterfacepresentationagainsttherequirementsofthepresentdocument.Itisoutsidethescopeofthisannextoidentifythespecificdetailsoftheimplementationofthetests.Detailsoftestequipmentaccuracyandthespecificationtoleranceofthetestdevicesarenotincludedinallcases.Wheresuchdetailsareprovided,theyshallbecompliedwith,butthewaytheyareexpressedshallnotconstrainthemethodofimplementingthetest.NOTE:Attentionisdrawntotheissueofmeasurementuncertaintywhichmaybeaddressedinfuturedocuments.Notalltherequiredtestresultsmakeallowanceforspuriouseventsduringtesting(e.g.errorsduetoEMCeffects),whichmaymakeitnecessarytorepeatatest.Thetestconfigurationsgivendonotimplyaspecificrealizationofthetestequipmentortestarrangement,ortheuseofspecifictestdevices.However,anytestconfigurationusedshallprovidethosetestconditionsspecifiedunder"interfacestate","stimulus"and"monitor"foreachindividualtest.Thetestequipmentshallbeadevice,orgroupofdevices,thatiscapableofgeneratingastimulussignalconformingtothepresentdocumentandcapableofmonitoringthesignalreceivedfromthenetworkinterface.A.1.1EquipmentconnectionTheleasedlineinterfacemaybesuppliedwitheitherasocketorasetofcontactssuitableforterminationofsolidconductors.Testingshallbeperformedatthesocketorcontactpointsasthisisthepointatwhichcompliancewiththepresentdocumentisrequired.A.1.2ReferenceimpedanceWherethetestdefinestheuseofthereferenceimpedance(ZR),thisshallbeacompleximpedancemadeupofaresistanceof270Ωinserieswithaparallelcombinationof750Ωand150nF.ThisisshowninfigureA.1.SpecificrealizationsofthereferenceimpedancerequiredfortheperformanceofthetestsshallhaveareturnlossagainstZRof40dBoverthefrequencyrange300Hzto3400Hz.270Ω750Ω150nFFigureA.1:ReferenceimpedanceZRSIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)18A.1.3Non-reactivelineterminationForallthetestsspecifiedinthisannex,exceptthetestsforrandomcircuitnoise(clauseA.2.6),singletoneinterference(clauseA.2.10)andreturnloss(clauseA.2.14),anon-reactivelineterminationof600Ωisused.Inthetestforrandomcircuitnoiseandthetestforsingletoneinterference,bothimpedancesareusedasthetestsassumenon-reactivelineterminationsintheinstrumentation.Wherealineterminationof600Ωisspecified,thisshallbeanon-reactiveresistanceof600Ω±0,25%.A.1.4MeasurementfrequencyManyoftherequirementsspecifyatestsignalfrequencyof1020Hz.Wherethisisthecase,thespecifiedreferencefrequencytoleranceshallbe-7Hzto+2Hz(range1013Hzto1022Hz).A.2TestmethodsA.2.1OveralllossRequirement:Clauses4.1.2and4.1.7.2.Purpose:Todeterminetheoveralllossoftheleasedline.Testconfiguration:Atestsenderisconnectedtooneinterfaceoftheleasedline.Alevelmeterisconnectedtothefarendinterfaceoftheleasedlinewhichisterminatedin600Ω.SeefigureA.2.Thetestisrepeatedintheotherdirection.TESTSENDERLEVELMETERNearendFarendCONNECTIONFigureA.2:OveralllossConnectionstate:Available.Stimulus:Thetestsender,withanimpedanceof600Ω,issettosendasinglesignalfrequency1020Hzintoaloadimpedanceof600Ωatapowerlevelof-9dBm.Theloadimpedanceisthendisconnectedandthesignalappliedtooneinterfaceoftheleasedline.Monitor:Thepowerlevelismeasuredatthefarendoftheleasedlinewithaterminatingimpedanceof600Ω.Result:Theoverallloss,whichisthedifferencebetween-9dBmandthemeasuredoutputpower,shallbeasdefinedinclause4.1.2.NOTE:Forthepurposesofcheckingtherequirementofclause4.1.7.2thetestresultmayberecordedeverytimethetestisperformedduringthelifetimeoftheleasedlineandtherecordcheckedfordeviationfromthelimitssetinclause4.1.7.2.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)19A.2.2Loss/frequencydistortionandmaximummeaninputpowerRequirement:Clauses4.1.3and4.1.4.1.Purpose:Tochecktheloss/frequencydistortionoftheleasedlineoverthebandwidth300Hzto3600Hz.Thistestalsoservestochecktherequirementformaximummeaninputpowerhandlingcapacityoftheleasedlineinterfaceoverthebandwidth300Hzto3400Hz.Testconfiguration:Atestsenderisconnectedtooneinterfaceoftheleasedline.Atestreceiverisconnectedtothefarendinterfaceoftheleasedlinewhichisterminatedin600Ω.SeefigureA.3.TESTSENDERLEVELMETERNearendFarendCONNECTIONFigureA.3:Loss/frequencydistortionandmaximummeaninputpowerConnectionstate:Available.Stimulus:Thetestsender,withanimpedanceof600Ω,issettosendasignalatanumberoffrequencieswithintherange300Hzto3600Hzintoaloadimpedanceof600Ωatapowerlevelof-9dBm.Ateachfrequency,inturn,theloadimpedanceisdisconnectedandthesignalappliedtooneinterfaceoftheleasedline.Monitor:Thepowerlevelismeasuredatthefarendoftheleasedlinewithaterminatingimpedanceof600Ω.Result:RelativetothereceivedlevelmeasuredinclauseA.2.1,thereceivedlevelsatotherfrequenciesshallbewithinthelimitsdefinedbytable2andfigure1.A.2.3MaximuminstantaneouspowerRequirement:Clause4.1.4.2.Purpose:Toverifythattheleasedlinecancarryasignalcorrespondingtothepeakvalueofa+4dBmsignalattheinput.Asinewaveof1020Hz,atalevelequivalentto+4dBm,istransmittedintotheleasedlineforadurationofnomorethan100ms.Thereshouldbenoclippingattheoutput.Testconfiguration:SeefigureA.4.TESTSENDERMONITORINGEQUIPMENTNearendFarendCONNECTIONFigureA.4:MaximuminstantaneouspowerConnectionstate:Available.Stimulus:Thetestsender,withanimpedanceof600Ω,issettosendasinewaveoffrequency1020Hz,atalevelof+4dBm,intotheinputoftheleasedline,withadurationofnomorethan100ms.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)20Monitor:Thesignalacrossaterminationimpedanceof600Ωatthefarendoftheleasedline.Result:Thereshallbenoclippingofthesignalattheoutputoftheleasedline.A.2.4GroupdelaydistortionRequirement:Clause4.1.6.Purpose:Tocheckgroupdelaydistortionoftheleasedline.Testconfiguration:AmeasuringsettothespecificationofITU-TRecommendationO.81[2]isconnectedwiththetransmitteratoneendoftheconnectiontobemeasured,andthereceiverisconnectedtotheotherendoftheconnection.SeefigureA.5.TESTSENDERTESTRECEIVERNearendFarendCONNECTIONFigureA.5:GroupdelaydistortionConnectionstate:Available.Stimulus:Modulated,identified,referenceandmeasurementfrequencysignal,asdescribedinITU-TRecommendationO.81[2].Monitor:Thegroupdelay.Result:Thegroupdelayshallbewithintherangespecifiedinclause4.1.6.A.2.5AmplitudehitsRequirement:Clause4.1.7.1Purpose:Tochecktheleasedlineforamplitudehits.Testconfiguration:PerformedusinganinstrumentcomplyingwithITU-TRecommendationO.95[4].Thetransmitter(testsender)isconnectedtooneinterfaceofthecircuitundertestandthereceiverisconnectedtotheotherinterface.SeefigureA.6.TESTSENDERTESTRECEIVERNearendFarendCONNECTIONFigureA.6:AmplitudehitsConnectionstate:Available.Stimulus:Thetransmitter,withanimpedanceof600Ω,issettosendatapowerlevelof-9dBmatafrequencyof1020Hz.Monitor:Thenumberofamplitudehitsgreaterthan±2dBwithadurationof4msorgreaterforaperiodof15minutes.Slowamplitudechanges,asdefinedinITU-TRecommendationO.95[4],shallnotbecounted.SIST EN 300 449 V1.2.1:2004

ETSIETSIEN300449V1.2.1(2001-07)21Result:Thenumberofamplitudehitsshallbewithinthelimitsspecifiedinclause4.1.7.1.NOTE:Thecontributionofthereturnconnection,ifany,totheresultmaybeestimatedfromtheresultsofanumberoftestsoverdifferentleasedlinesusingthesamereturnconnectionineachcase.A.2.6RandomcircuitnoiseRequirement:Clause4.1.8.Purpose:Tomeasuretherandomcircuitnoiseoftheleasedlineconnection.Testconfiguration:PerformedusingapsophometercomplyingwithITU-TRecommendationO.41[7].Withthefarendinterfaceoftheleasedlineterminatedwiththereferenceimpedance,thepsophometerisconnectedtothenearendinterface.SeefigureA.7.NearendFarendPSOPHOMETERZRCONNECTIONFigureA.7:RandomcircuitnoiseConnectionstate:Available.Stimulus:None.Monitor:Thepsophometricallyweightednoisesignalacrossthe600Ωterminationatthenearendinterfaceoftheleasedline.NOTE:Thepsophometerterminatesthenearendofthelinewithitsowninternal600Ωtermination.Result:Thereadingsobtainedshallbewithinthelimitsspecifiedinclause4.1.8.A.2.7ImpulsivenoiseRequirements:Clause4.1.9.Purpose:Tochecktheimpulsivenoiseperformanceoftheleasedlineconnection.Testconfiguration:Perform
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