SIST EN 300 419 V1.2.1:2003

• Abstract:

  Specification of the performance requirement for the connection through the public network, including test procedures for compliance. revision of ETS 300 419 to improve the safety related aspects following a liaison received from TC Safety.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 419 V1.2.1 (2001-07) - Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics

SIST EN 300 419 V1.2.1:2003 is the Slovenian adoption of the ETSI European Standard for Access and Terminals. It specifies the connection characteristics for Open Network Provision (ONP) 2 048 kbit/s digital structured leased lines (D2048S), including the performance limits and compliance tests used by network operators, terminal equipment suppliers, and test laboratories. In practice, it tells you what a D2048S service must carry, how the frame structure is handled at the Network Termination Point (NTP), and how conformance is checked.

What does SIST EN 300 419 V1.2.1:2003 specify?

SIST EN 300 419 V1.2.1:2003 specifies the technical requirements and test principles for connection characteristics of ONP 2 048 kbit/s digital structured leased lines through the public network. It applies to leased lines whose establishment or release does not require protocol exchange or other user intervention at the NTP.

The document also states that the tests are for compliance checking, but it does not cover the practical implementation of the tests or relevant regulations. It is organized into scope, references, definitions and abbreviations, requirements, and five annexes.

Annex	What it covers
Annex A	Normative test methods
Annex B	Normative definition of the frame structure
Annex C	Informative derivation of error performance limits
Annex D	Informative availability guidance
Annex E	Informative bibliography

What are the key requirements of SIST EN 300 419 V1.2.1:2003?

Clause 4 sets the service attributes that a D2048S connection must meet, and Annex A gives the tests used to check them. The practical focus is on timing, data transparency, frame handling, network performance, and whether the line behaves the same in both directions.

• Transfer rate and timing - Clause 4.1.1 allows the line to carry user timing within 2048 kbit/s ±50 ppm, to follow network timing, or to pass one input timing to both outputs. In practice, the provider must declare the timing mode because later tests depend on it.

• Information transfer - Clauses 4.1.1.2 and 4.1.2 require a usable information rate of 1984 kbit/s and unrestricted binary content with bit-sequence integrity. This means the service must transport arbitrary user data, not just special test patterns.

• Structure and CRC-4 handling - Clause 4.1.3 and Annex B require the defined frame and multiframe structure, with CRC-4 recalculated at the NTP and E-bits used to show errored SMFs. For the user, this allows error monitoring at the edge of the public network.

• Frame recovery behavior - Clause 4.1.3.3 defines how the line reacts to incorrect frame alignment signals and when it may stop transparent transmission during frame search. That matters when you are checking how quickly service recovers after framing errors.

• Connection setup - Clause 4.1.4 requires establishment and release without protocol exchange or other intervention at the NTP. This is important for operational simplicity and for testing lines that are expected to come up automatically.

• Symmetry and configuration - Clauses 4.1.5 and 4.1.6 require symmetrical operation and a point-to-point configuration. Both directions must offer the same frame structure and information transfer capability.

• Network performance - Clause 4.1.7 covers delay, jitter, controlled slip, and error performance. The line is tested separately for terrestrial and satellite cases, and controlled slip is limited over 24-hour periods.

• Error performance and availability - Clause 4.1.7.4 uses ES, SES, and BBE as the main error measures, while clause 4.1.7.5 states that there is no availability requirement in the document. Annex D gives guidance if availability is needed in a contract.

What terms does SIST EN 300 419 V1.2.1:2003 define?

Background Block Error (BBE) - An errored block that is not part of a Severely Errored Second (SES), used to measure background error performance.

Controlled slip - A loss or gain of digit positions whose amount and timing are controlled so the signal can match a different rate.

Errored Second (ES) - A one-second period containing one or more errored blocks.

Severely Errored Second (SES) - A one-second period with a high concentration of errors or a severely disturbed period.

Network Termination Point (NTP) - The physical network access point where compliance is assessed.

Sub-MultiFrame (SMF) - A sequence of 8 frames, each of 256 bits, over which CRC-4 is calculated.

Who uses SIST EN 300 419 V1.2.1:2003?

SIST EN 300 419 V1.2.1:2003 is used by public telecommunications network operators, leased line providers, and terminal equipment manufacturers. Test laboratories use it to set up compliance tests, and procurement or quality teams use it to check whether a proposed 2 048 kbit/s structured leased line meets the required connection behavior.

It is also relevant where services are ordered, accepted, or maintained against ONP technical conditions, especially when the buyer needs a point-to-point leased line with defined framing and monitored error performance.

What changed in SIST EN 300 419 V1.2.1:2003 from the previous edition?

SIST EN 300 419 V1.2.1:2003 is a revision of ETS 300 419 made to improve the safety-related aspects after a liaison from TC Safety.

Which standards are used with SIST EN 300 419 V1.2.1:2003?

The document references ITU-T O.151, O.153, and O.171 for error-performance and jitter measuring equipment, and EN 300 418 for the network interface presentation used in the tests. The foreword also identifies EN 300 420 as the companion standard for the terminal equipment interface.

It also says that the frame structure is based on ETS 300 167 and ITU-T G.704 and G.706, which are the structural basis for the 2 048 kbit/s framed service.

What does the SIST EN 300 419 V1.2.1:2003 document contain?

The document includes a clause on connection attributes, a clause on definitions and abbreviations, and a detailed requirements section that is tied to specific tests in Annex A. Annex A gives loop-back based test configurations, stimuli, monitoring points, and pass/fail criteria for rate, delay, jitter, error, slip, and frame behavior.

Annex B defines the 256-bit frame, the CRC-4 allocation, and how CRC-4 is generated and monitored. Annex C explains how the error performance limits are derived for terrestrial and satellite reference connections, and Annex D gives availability terms and target figures for reference planning.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 419 Version 1.2.1SIST EN 300 419 V1.2.1:2003en01-december-2003SIST EN 300 419 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300419V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);ConnectioncharacteristicsSIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)2ReferenceREN/AT-020019Keywordsaccess,digital,leasedline,network,ONP,testing,UNIETSI650RoutedesLuciolesF-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 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Requirements.94.1Attributes.104.1.1Transferrate.114.1.1.1Leasedlinetiming.114.1.1.2Informationtransferrate.114.1.2Informationtransfersusceptance.114.1.3Structure.114.1.3.1CRC-4.114.1.3.2UseoftheE-bits.124.1.3.3Framesynchronizationanddatatransmissioncapability.124.1.3.3.1Multiframealignment.124.1.3.4UseoftheA-bit.124.1.3.5UseoftheSabits.134.1.4Establishmentofconnection.134.1.5Symmetry.134.1.6Connectionconfiguration.134.1.7Networkperformance.134.1.7.1Transmissiondelay.134.1.7.2Jitter.144.1.7.2.1Jittertoleranceatthenetworkinputport.144.1.7.2.2Maximumjitteratthenetworkoutputport.144.1.7.3Controlledslip.154.1.7.4Error.154.1.7.4.1BringingIntoService(BIS)limits.154.1.7.4.2Performancelevel.154.1.7.5Availability.15AnnexA(normative):Testmethods.16A.1General.16A.1.1Equipmentconnection.16A.1.2Sequenceofperformingthetests.16A.2Testmethods.16A.2.1Informationtransferrate,susceptanceandsymmetry.16A.2.2Delay.17A.2.3Jitter.18A.2.4Errorandslip.19A.2.5Structure.20A.2.5.1OutputstructureandCRC-4generation.20A.2.5.2UseoftheE-bits.21A.2.5.3Framesynchronizationanddatatransmissioncapability.21A.2.5.4Multiframealignment.23AnnexB(normative):Definitionofframestructure.24SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)4B.1Framestructure.24B.2CRC-4.24B.2.1CRC-4generation.25B.2.2CRC-4monitoring.25AnnexC(informative):Derivationoferrorperformancelimits.26C.1Introduction.26C.2Referenceconnections.26C.2.1Terrestrialconnection.26C.2.2Satelliteconnection.27C.3Errorperformanceobjectives.27C.4Long-termerrorperformance.28AnnexD(informative):Availability.29D.1General.29D.1.1Unavailability.29D.1.2Outageintensity.29D.1.3Meantimebetweenfailures.29D.1.4Meantimetorestoreservice.29D.2Recommendations.29AnnexE(informative):Bibliography.31History.32SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(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).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC,laterreplacedby98/13/EC,terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationI.340forIntegratedServicesDigitalNetwork(ISDN)connectiontypeswasusedasabasisfortheconnectioncharacteristics.ETS300167andITU-TRecommendationsG.704andG.706areusedasthebasisforthestructure.SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesforconnectioncharacteristicsofOpenNetworkProvision(ONP)2048kbit/sdigitalstructuredleasedlines.Theleasedlineoperatesat2048kbit/sandprovidesaninformationtransmissioncapability,withoutrestrictiononbinarycontent,of1984kbit/s.Theremaining64kbit/sprovidesan8kHzframingstructureinaccordancewithETS300167andITU-TRecommendationsG.704andG.706.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTPs)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocument.Togetherwiththecompanionstandard,EN300418[4]definingthenetworkinterfacepresentation,thepresentdocumentdescribesthetechnicalcharacteristicsoftheleasedlineserviceofferedtotheuser.Thetestsspecifiedinthepresentdocumentcannotbecarriedoutbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryingusers'traffic.Thusthetestsaredesignedforbringingintoandreturningintoservice,althoughthereisnoobligationtoperformthesetestseachtimealeasedlineisbroughtintoorreturnedintoservice.However,becausetheconnectionisstructured,theerrorperformancemaybemonitoredbytheleasedlineproviderwhilethelineisinservice.Thepresentdocumentisapplicableforleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentspecifiesthecompliancetestsfortheconnectionrequirements.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetests,nordoesitincludeinformationonanyrelevantregulations.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimarybitrateandabove".[2]ITU-TRecommendationO.153(1992):"Basicparametersforthemeasurementoferrorperformanceatbitratesbelowtheprimaryrate".[3]ITU-TRecommendationO.171(1997):"Timingjitterandwandermeasuringequipmentfordigitalsystemswhicharebasedontheplesiochronousdigitalhierarchy(PDH)".[4]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:BackgroundBlockError(BBE):erroredblocknotoccurringaspartofaSeverelyErroredSecond(SES)BBEratio:ratiooferroredblockstototalblocksduringafixedmeasurementintervalexcludingallblocksduringseverelyerroredsecondsandwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)block:setof2048consecutivebitsequivalenttooneSub-MultiFrame(SMF).EachblockismonitoredbymeansofaCyclicRedundancyCheck-4bit(CRC-4)errorcheck.Thelengthofeachblockcorrespondstoaperiodof1msNOTE:ThisdefinitionisrelevantonlytothepresentdocumentandismorespecificthanthegenericdefinitiongiveninITU-TRecommendationG.826.controlledslip:irretrievablelossorgainofasetofconsecutivedigitpositionsinadigitalsignal,inwhichboththemagnitudeandinstantofthatlossorgainarecontrolled,toenablethesignaltoaccordwitharatedifferentfromitsownerroredblock:blockinwhichoneormorebitsareinerror(seeITU-TRecommendationG.826)ErroredSecond(ES):one-secondperiodwithoneormoreerroredblocks(seeITU-TRecommendationG.826)ESratio:ratioofEStototalsecondsduringafixedmeasurementinterval.TheESratioisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)erroredSub-MultiFrame:Sub-MultiFrame(SMF)wherethecalculatedCRC-4doesnotcorrespondwiththeCRC-4containedwithinthenextSMF(seeclauseB.2.2)frame:sequenceof256bitsofwhichthefirst8bitsdefinetheframestructure(seeannexB)frameslip:slipofonecompleteframeleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweenNTPsandthatdonotincludeswitchingfunctionsthattheusercancontrol(e.g.on-demandswitching)multiframe:sequenceoftwoSMFscontainingthemultiframealignmentword(seeannexB)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccessto,andefficientcommunicationthrough,thatpublicnetworkPRBS(29-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.1ofITU-TRecommendationO.153[2])PRBS(215-1):PRBS(asdefinedinclause2.1ofITU-TRecommendationO.151[1])Sabits:bits4to8(bitsSa4toSa8)inframesnotcontainingtheframealignmentsignal(seeannexB)satellitetransmission:transmissionviaanearthorbitingsatelliteseverelydisturbedperiod:forout-of-servicemeasurements,aseverelydisturbedperiodoccurswhen,overaperiodoftimeequivalenttofourcontiguousblocks,eitherallthecontiguousblocksareaffectedbyahighbiterrordensityof=10-2,oralossofsignalisobserved.Forin-servicemonitoringpurposes,aseverelydisturbedperiodisestimatedbytheoccurrenceoflossofsignalorlossofframealignment(seeITU-TRecommendationG.826)SeverelyErroredSecond(SES):one-secondperiodwhichcontains=805erroredblocksoratleastoneseverelydisturbedperiod(seeITU-TRecommendationG.826)SESratio:ratioofSEStototalsecondsduringafixedmeasurementinterval.TheSESratioisnotevaluatedwhiletheleasedlineconnectionisintheunavailablestate(seeITU-TRecommendationG.826)SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)9Sub-MultiFrame(SMF):sequenceof8frames,eachof256bits,overwhichtheCRC-4iscalculated(seeannexB)uncontrolledslip:lossorgainofadigitpositionorasetofconsecutivedigitpositionsinadigitalsignal,resultingfromanaberrationofthetimingprocessesassociatedwithtransmissionorswitchingofadigitalsignal,andinwhicheitherthemagnitudeortheinstantofthatlossorgainisnotcontrolledunavailabilityperiod:unavailabilityperiodbeginsattheonsetof10consecutiveSES.These10sareconsideredtobepartoftheunavailabilityperiod.Theunavailabilityperiodendsattheonsetof10consecutivenon-SES.These10sarenotconsideredpartoftheunavailabilityperiodunavailablestate:leasedlineconnectionisintheunavailablestateifanunavailabilityperiodisoccurringinoneorbothdirectionsoftransmission3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:BBEBackgroundBlockErrorBISBringingIntoServiceCRC-4CyclicRedundancyCheck-4bitD2048S2048kbit/sdigitalstructuredONPleasedlineD2048U2048kbit/sdigitalstructuredONPleasedlineEMCElectroMagneticCompatibilityESErroredSecondHDB3HighDensityBipolarcodeoforder3NTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequencePRCPrimaryReferenceClockRAIRemoteAlarmIndicationRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment)SESSeverelyErroredSecondSMFSub-MultiFrameTXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment)UIUnitInterval4RequirementsTheperformanceoftheleasedlineshallcomplywiththeserequirementsonlyiftheconditionsofsupplyofthenetworkequipmentprovidingtheNTParemet(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140arespecifiedinthepresentdocument:-transferrate;-informationtransfersusceptance;-structure;-establishmentofconnection;-symmetry;-connectionconfiguration;-networkperformance.SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)10Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-slip;-error.4.1AttributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesConnectiontypeattributesValueDescriptionNatureReferenceclauseTransferrateLeasedlinetimingInformationtransferrate2048kbit/s1984kbit/sSee4.1.1.1See4.1.1.2InformationtransfersusceptanceNorestrictiononbinarycontentSee4.1.2StructureFrameintegritySee4.1.3EstablishmentofconnectionWithoutuserinterventionSee4.1.4SymmetrySymmetricalinbothdirectionsSee4.1.5ConnectionconfigurationPoint-to-pointSee4.1.6Networkperformancesub-attributesConnectiontypeattributesValueDescriptionNatureReferenceclauseTransmissiondelayTerrestrialandsatelliteoptionsSee4.1.7.1JitterInputandoutputportsSee4.1.7.2Slip(controlledslip)≤5per24hourperiodSee4.1.7.3Errorparameters(see5.1.7.4)TerrestrialSatelliteEnd-to-endperformanceobjectivesErroredSeconds(ES)ratio<2,000%<3,120%SeverelyErroredSeconds(SES)ratio<0,100%<0,156%BackgroundBlockErrors(BBE)ratio<0,015%<0,023%Performancelevelover24hourperiod(24hourtestlimit)ErroredSeconds(ES)<1645<2592SeverelyErroredSeconds(SES)<68<112BackgroundBlockErrors(BBE)<12732<19933SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)114.1.1Transferrate4.1.1.1LeasedlinetimingRequirement:Theleasedlineshalleither:a)carryusertimingwithintherange2048kbit/s±50partspermillion(ppm);orb)providetimingthatissynchronoustothenetworktiming;orc)takeusertimingwithintherange2048kbit/s±50ppmfromoneinputandprovidethistimingatbothoutputsoftheleasedline.NOTE1:Incaseb),networktimingistimingthatisderivedfromthesourceorsourcesoftimingthatareusedforthenetwork.Thusthetimingprovidedbytheleasedlinewillbesimilartothatprovidedbyotherdigitalservices.NOTE2:Whenthetiminginbothdirectionsisnotsynchronous,thenumberoftransmittedE-bitsdiffersfromthenumberofreceivedSMFs.Asaconsequence,eithersomevalidE-bitsarelostormeaninglessE-bitsareinserted.Test:Thereisnospecifictest;theleasedlineprovidershalldeclarewhichtypeoftimingtheleasedlineprovidesandthisshallbetakenintoaccountduringthesubsequenttestsdefinedinannexA.4.1.1.2InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringanominalinformationrateof1984kbit/swhichiscontainedwithintheframestructuredefinedfortheleasedline(seeclause4.1.3).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.2InformationtransfersusceptanceRequirement:Theconnectionshallbecapableoftransferringdigitalinformationwithbitsequenceintegrity,andwithoutrestrictiononbinarycontent,atthenominalrateof1984kbit/swithinthedefinedframestructure(seeclause4.1.3).Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3StructureThepurposeofthestructureistoallowtheleasedlineprovidertomonitortheerrorperformanceoftheleasedlinesfromNTPtoNTP.TheCRC-4is,therefore,notnecessarilytransmittedtransparentlyfromNTPtoNTP;itmaybeupdatedbytheleasedlineprovidertodeterminethelocationoferrors.InordertoallowtheterminalequipmenttomonitortheintegrityofthepathbetweentheterminalequipmentandtheNTP,theNTPisrequiredtoprovideacorrectCRC-4,andtorespondcorrectlywiththeE-bitsintheeventofanincorrectlyreceivedCRC-4.Requirement:Foreachdirectionoftransmission,theleasedlineshallacceptaninputbitstreamwithaframeandmultiframestructureasdefinedinannexB.Whentheleasedlineinputhastheaboveframestructureandtheconnectionisnotintheunavailablestate,theoutputoftheleasedlineshallalsoconformtotheframeandmultiframestructuredefinedinannexB,withthestructurehavingthesamerelationshiptotheinformationtransferredasattheinput,maintainingtheframestructureintegrity.Test:ThetestshallbeconductedaccordingtoclausesA.2.1andA.2.5.1.4.1.3.1CRC-4Requirement:AteachNTP,theCRC-4bitstransmittedintheoutputbitstreamshallbeasdefinedintablesB.1andB.2foracompleteCRC-4multiframeandshallcorrespondtothedatatransmittedattheoutputoftheleasedlineinterface,(i.e.theCRC-4shallberecalculatedintheequipmentprovidingtheNTP).Test:ThetestshallbeconductedaccordingtoclauseA.2.5.1.SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)124.1.3.2UseoftheE-bitsRequirement:AteachNTP,theE-bitstransmittedintheoutputbitstreamshallindicateerroredSMFsintheinputbitstreamatthatNTP.OneE-bitineachmultiframeshallbesettobinaryZEROforeacherroredSMFreceivedintheinputbitstream.TheE-bitscorrespondingtonon-erroredSMFsshallbesettobinaryONE.AnydelaybetweenthedetectionofanerroredSMFandthesettingoftheE-bitthatindicatestheerroredSMFshallbelessthan1s.NOTE:TheintentionisthattheCRC-4verification,andtheassociatedgenerationoftheE-bits,willbeperformedintheequipmentthatprovidestheNTPinordertoindicateonlythoseerrorsthathaveoccurredbetweentheterminalequipmentandtheNTPandnotthoseerrorsthathaveoccurredwithinthenetwork.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.2.4.1.3.3FramesynchronizationanddatatransmissioncapabilityRequirement:Theleasedlineshallcontinuetotransparentlytransmitdataintheeventofreceivingoneortwoconsecutiveincorrectframealignmentsignals.Onreceiptof:-threeconsecutiveincorrectframealignmentsignals;or-therebeing=915erroredSMFsoutof1000SMFs,theleasedlineshallconsiderframealignmenttohavebeenlostandinitiateasearchforframealignmentduringwhichtimetheleasedlinemayceasetransparenttransmissionofdata.NOTE:Someimplementationsmayalsoconsiderframealignmenttohavebeenlostintheeventthatbit2inframesnotcontainingtheframealignmentsignalisinerroronthreeconsecutiveoccasions.ThissituationisunlikelytooccurexceptintheeventofhigherrorratesbetweentheterminalequipmentandtheNTP.Framealignmentshallnotbeconsideredashavingbeenregaineduntil:a)forthefirsttime,thepresenceofthecorrectframealignmentsignal;andb)theabsenceoftheframealignmentsignalinthefollowingframedetectedbyverifyingthatbit2ofthebasicframeisabinaryONE;andc)forthesecondtime,thepresenceofthecorrectframealignmentsignalinthenextframe,inwhichcasetransparenttransmissionofthedatashallcommencewithin20msprovidedthatthedatadoesnotcontainanysimulatedframealignmentwords.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.3.4.1.3.3.1MultiframealignmentRequirement:CRC-4multiframealignmentshallbeachievedifatleasttwovalidCRC-4multiframealignmentsignalscanbelocatedwithin8ms(thetimeseparatingtwoCRC-4multiframealignmentsignalsbeing2msoramultipleof2ms).Ifmultiframealignmentcannotbeachievedwithin8msitshallbeassumedthatframealignmentisduetoaspuriousframealignmentsignalandaresearchforframealignmentshallbeinitiated.NOTE:Theresearchforframealignmentshouldbestartedatapointjustafterthelocationoftheassumedspuriousframealignmentsignal.Thiswillusuallyavoidrealignmentontothespuriousframealignmentsignal.Test:ThetestshallbeconductedaccordingtoclauseA.2.5.4.4.1.3.4UseoftheA-bitThereisnorequirementoftheuseoftheA-bitwithinthepresentdocument.ThevalueoftheA-bitisundefinedattheoutputoftheleasedline.SIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)134.1.3.5UseoftheSabitsThereisnorequirementoftheuseoftheSabitswithinthepresentdocument.ThevaluesoftheSabitsareundefinedattheoutputoftheleasedline.4.1.4EstablishmentofconnectionRequirement:EstablishmentorreleaseoftheconnectionshallnotrequireanyprotocolexchangeorotherinterventionattheNTPbytheuser.Test:Bydeclaration.4.1.5SymmetryRequirement:Theconnectionshallbesymmetrical,i.e.eachdirectionoftransmissionshallhavethesameframestructureandinformationtransfercapability.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.6ConnectionconfigurationRequirement:Theconnectionconfigurationshallbepoint-to-point.Test:Bydeclaration.4.1.7NetworkperformanceThenetworkperformancesub-attributesaredisplayedintable1.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.4.1.7.1TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:-forconnectionswheresatellitetransmissionisnotinvolved,theonewayend-to-enddelayshallbelessthan(10+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure1;or-forconnectionswheresatellitetransmissionisinvolved,theonewayend-to-enddelayshallbelessthan350ms.NOTE:TheserequirementsarebasedonclausesannexA.2andA.3ofITU-TRecommendationG.114.10300060001009000Delay(ms)Geographicaldistance(km)Figure1:UpperlimitofdelaySIST EN 300 419 V1.2.1:2003

ETSIETSIEN300419V1.2.1(2001-07)14Therearenorequirementsforlowfrequency(below20Hz)variationofonewayend-to-enddelayunderthepresentdocument.Test:ThetestshallbeconductedaccordingtoclauseA.2.2.4.1.7.2Jitter4.1.7.2.1JittertoleranceatthenetworkinputportRequirement:Theleasedlineshallfunctionasspecifiedwithinputjitterbeingthesumoftwobandlimitedcomponentsasdefinedintable2.NOTE:Thejittertolerancefortheconnectionisdefinedinthiswayinsteadofspecifyingsinglejitterfrequencies,forthefollowingreasons:-thismethodismorerepresentativeofthejitterencounteredinpractice;and-longregeneratorchainsmaybeespeciallysensitivetosinglejitterfrequencies.Table2:ComponentsofinputjitterFiltersforgenerationofjitterspectrum(firstorder)BandpassfilterformeasurementofinputjitterInputjittermeasuredbybandpassfilterLowercut-off(highpass)Uppercut-off(lowpass)(lowercut-offfirstorder)UnitInterval(UI)peak-to-peak(maximum)Onlylowpass4Hz4Hzto100kHz1,1UI40Hz100kHz40Hzto100kHz0,11UINOTE:Thepurposeofthefirstorderlowpasslinearfilterwithanuppercut-offof4Hzistogenerateaslopeof20dBperdecadefrom4Hzto40Hzontheinputjitterspectrum.Thelevelofjitter(ormorecorrectlywander)generatedbythismethodatfrequenciesbelow4Hzisoftheorderof1UI.Inprinciple,thereisnorequirementforwanderandthiswanderisanunintendedby-productofthemethodofspecifyingthejitter.Inpractice,wanderofthislevelshouldnotcauseanyproblemsforthenetwork.Test:ThetestshallbeconductedaccordingtoclauseA.2.3.4.1.7.2.2MaximumjitteratthenetworkoutputportRequirement:Themaximumjitterattheoutputportofthenetworkshallnotexceedthelimitsspecifiedintable3,whenmeasuredwithlinearfilterswiththedefinedcut-offfrequencies.Atfrequenciesbelowthelower3dBpoint,theattenuationofthehighpassfiltershallrisewithavaluegreaterthan,orequalto,20dBperdecade.Atfrequenciesabovetheupper3dBpoint,theattenuationofthelow
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