SIST EN 300 247 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 300 247 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 300 247 V1.2.1 (2001-07) - Access and Terminals (AT); 2 048 kbit/s digital unstructured lease line (D2048U); Connection characteristics

SIST EN 300 247 V1.2.1:2003 is the Slovenian adoption of ETSI EN 300 247 V1.2.1 for Access and Terminals. It specifies the connection characteristics and compliance test principles for ONP 2 048 kbit/s digital unstructured leased lines (D2048U) presented at Network Termination Points (NTP). In practice, it tells operators, terminal-equipment suppliers and test laboratories what a public-network connection must deliver and how to check it.

What does SIST EN 300 247 V1.2.1:2003 specify?

SIST EN 300 247 V1.2.1:2003 defines the technical requirements for the connection through the public network, including how compliance is tested. Clause 1 says the leased line offers the full 2 048 kbit/s bit rate with no restriction on binary content, and that the tests are intended for bringing a line into service or returning it to service.

The document is organized around general references, definitions, the requirement set in Clause 4, and a normative annex with test methods. It also includes informative annexes that explain the error-measurement basis and list related documents.

Annex	What it covers
Annex A	Normative test methods and test set-ups
Annex B	Informative reduction of the measuring period for error parameters
Annex C	Informative bibliography

What are the key requirements of SIST EN 300 247 V1.2.1:2003?

SIST EN 300 247 V1.2.1:2003 uses the ITU-T attribute technique to describe the connection in Clause 4. The main practical point is that compliance is checked at the NTP and depends on the network equipment and its supply conditions.

Connection attributes

• Information transfer rate - Clause 4.1.1 requires 2 048 kbit/s ±50 ppm. This means the line must carry the expected payload rate with tight frequency accuracy.
• Information transfer susceptance and structure - Clauses 4.1.2 and 4.1.3 require unrestricted digital information over an unstructured connection. In practice, the user gets the full bit rate without a frame structure imposed by the service.
• Establishment of communication - Clause 4.1.4 requires no protocol exchange or other intervention at the NTP by the user to set up or release the connection. This matters when the service must behave like a simple leased circuit.
• Symmetry and communication configuration - Clauses 4.1.5 and 4.1.6 require symmetrical, point-to-point transmission. Each direction must have the same nominal characteristics.

Network performance

• Transmission delay - Clause 4.1.7.1 sets one-way delay limits that depend on whether satellite transmission is involved. Without satellite transmission, the limit depends on geographical distance; with satellite transmission, the one-way delay must be below 350 ms.
• Jitter - Clause 4.1.7.2 checks both jitter tolerance at the network input port and maximum jitter at the network output port. The test uses defined band-limited components, so readers know the line must withstand realistic timing variation and must not generate excessive jitter.
• Slip and errors - Clauses 4.1.7.3 and 4.1.7.4 set limits for slips, errored seconds, severely errored seconds and background block errors over 24-hour measuring periods. For operations teams, this is the part that links the service to measurable field performance.

Annex A is important because it gives the test principles, equipment connection, sequence of testing, and the specific test setups for rate, delay, jitter, error and slip.

What terms does SIST EN 300 247 V1.2.1:2003 define?

SIST EN 300 247 V1.2.1:2003 defines the terms that control how performance is counted.

• D2048U - the 2 048 kbit/s digital unstructured ONP leased line covered by the standard.
• NTP - the Network Termination Point, where the public network ends and compliance is assessed.
• Unavailability period - the time from the first of 10 consecutive severely errored seconds to just before the first following run of 10 seconds with no severe errors.
• Errored second - a one-second interval containing one or more errored blocks.
• Severely errored second - a one-second interval containing at least 30% errored blocks or at least one severely disturbed period.
• Slip - a sequence of one or more extra or missing consecutive unit intervals in the bitstream.
• Background block error ratio - the ratio used for long-term error assessment outside unavailability periods and severely errored seconds.

Who uses SIST EN 300 247 V1.2.1:2003?

SIST EN 300 247 V1.2.1:2003 is used by public telecommunications network operators, leased-line providers, terminal-equipment manufacturers, and test laboratories. It is also useful for quality managers and buyers who need to specify or verify a 2 Mbit/s leased-line service at the point of connection.

What changed in SIST EN 300 247 V1.2.1:2003 from the previous edition?

SIST EN 300 247 V1.2.1:2003 is a revision of ETS 300 247. The foreword says the revision was produced to improve the safety-related aspects following a liaison received from TC safety.

Which standards are used with SIST EN 300 247 V1.2.1:2003?

SIST EN 300 247 V1.2.1:2003 refers to EN 300 418 for network interface presentation and EN 300 248 for the terminal equipment interface. It also uses ITU-T Recommendation O.151 and ITU-T Recommendation O.153 for PRBS-based error-measuring equipment and bit-stream test signals.

What does the SIST EN 300 247 V1.2.1:2003 document contain?

SIST EN 300 247 V1.2.1:2003 contains a requirements table, delay and jitter criteria, error and slip limits, and the formulas or basis used to derive the 24-hour error thresholds. Annex A gives the test configurations and procedures, including figures for rate, delay, jitter, and error/slip measurements. Annex B explains how the error-measuring period was reduced from the ITU-T monthly model to a 24-hour test period. Annex C lists the related ITU-T and EU documents used as background for delay, jitter, slip, and error performance.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Access and Terminals (AT); 2 048 kbit/s digital unstructured lease line (D2048U); Connection characteristics33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 247 Version 1.2.1SIST EN 300 247 V1.2.1:2003en01-december-2003SIST EN 300 247 V1.2.1:2003SLOVENSKI
STANDARD
ETSIEN300247V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U);ConnectioncharacteristicsSIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)2ReferenceREN/AT-020017Keywordsaccess,digital,leasedline,ONPETSI650RoutedesLuciolesF-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 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)3ContentsIntellectualPropertyRights.4Foreword.4Introduction.51Scope.62References.63Definitionsandabbreviations.73.1Definitions.73.2Abbreviations.74Requirements.84.1Attributes.84.1.1Informationtransferrate.94.1.2Informationtransfersusceptance.94.1.3Structure.94.1.4Establishmentofcommunication.94.1.5Symmetry.94.1.6Communicationconfiguration.94.1.7Networkperformance.94.1.7.1Transmissiondelay.94.1.7.2Jitter.104.1.7.2.1Jittertoleranceatthenetworkinputport.104.1.7.2.2Maximumjitteratthenetworkoutputport.114.1.7.3Slip.114.1.7.4Error.114.1.7.4.1Erroredseconds.114.1.7.4.2Severelyerroredseconds.114.1.7.4.3Backgroundblockerrors.12AnnexA(normative):Testmethods.13A.1General.13A.1.1Equipmentconnection.13A.1.2Sequenceofperformingthetests.13A.2Testmethods.13A.2.1Informationtransferrate,susceptance,structureandsymmetry.13A.2.2Delay.14A.2.3Jitter.15A.2.4Errorandslip.16AnnexB(informative):Reductionofthemeasuringperiodforerror.18B.1Introduction.18B.2Explanation.18AnnexC(informative):Bibliography.21History.22SIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)4IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeAccessandTerminals(AT).ThepresentdocumentresultsfromamandatefromtheCommissionoftheEuropeanCommunity(CEC)toprovidestandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearetwootherstandardsdirectlyrelatedtothepresentdocument:-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300248:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U)Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)5IntroductionTheCouncilDirectiveontheapplicationofOpenNetworkProvision(ONP)toleasedlines(92/44/EEC)(seeannexC),concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedonpublictelecommunicationsnetworksandtheavailabilitythroughouttheCommunity(EEC)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthatTelecommunicationsOrganizationswithintheEECshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexC),laterreplacedby98/13/EC(seeannexC),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ITU-TRecommendationI.340(seeannexC)forISDNconnectiontypeswasusedasabasisfortheconnectioncharacteristics.SIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)61ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesforconnectioncharacteristicsofONP2048kbit/sdigitalunstructuredleasedlines.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTP)andincludesanyequipmentthatmayprovidetheNTP.Signalsbetweenterminalequipmentsaresubjecttoimpairmentsduringtheirtransferovertheconnection.Thelimitstotheseimpairmentsarestatedinthepresentdocument.Togetherwiththecompanionstandard,EN300418[3]definingtheinterfacepresentation,thepresentdocumentdescribestheserviceoffered.Theleasedlineprovidesaccesstothefulldigitalbitrateof2048kbit/swithnorestrictionsonthebinarycontent.Thetestsspecifiedinthepresentdocumentcannotbecarriedout,norcantheperformancebemonitoredbytheleasedlineprovider,whiletheleasedlineisinservice,i.e.carryingusers'traffic.Thusthetestsaredesignedforbringingintoandreturningintoservice,althoughthereisnoobligationtoperformthesetestseachtimealeasedlineisbroughtintoorreturnedintoservice.Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedonotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentspecifiesthecompliancetestsfortheconnectionrequirements.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetests,nordoesitincludeinformationonanyrelevantregulations.ThepresentdocumentdescribesthosecharacteristicsoftheconnectionthatcannotbedeterminedonlybytheequipmentprovidingtheNTPs.TherelatedstandardEN300418[3]definestheinterfacepresentationandplacesnofurtherconstraintsontheconnection.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]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".[4]ETSIEN300248:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U)Terminalequipmentinterface".SIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)73Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccessto,andefficientcommunicationthrough,thatpublicnetworkunavailabilityperiod:periodoftimebeginningatthefirstof10consecutiveseverelyerroredsecondsandendingimmediatelybeforethefirstfollowingperiodof10consecutivesecondsnoneofwhichareseverelyerrorederroredblock:blockwithoneormorebiterrors(seeITU-TRecommendationG.826(seeannexC))NOTE:Thedurationofablockis1millisecond.erroredsecond:one-secondperiodwithoneormoreerroredblocks(seeITU-TRecommendationG.826(seeannexC))severelydisturbedperiod:occurswhen,overaminimumperiodoftimeequivalenttofourcontiguousblocks,eitherallthecontiguousblocksareaffectedbyahighbinaryerrordensityofatleast10-2,oralossofsignalinformationisobserved(seeITU-TRecommendationG.826(seeannexC))severelyerroredsecond:one-secondperiodwhichcontainsatleast30%erroredblocksoratleastoneseverelydisturbedperiod(seeITU-TRecommendationG.826(seeannexC))slip:sequenceofoneormoreextraormissingconsecutiveunitintervalsinthebitstreamerroredsecondsratio:ratiooferroredsecondsoverallsecondswithinaspecifiedmeasuringperiod,whereneitherarecountedduringunavailabilityperiods(seeITU-TRecommendationG.826(seeannexC))severelyerroredsecondsratio:ratioofseverelyerroredsecondsoverallsecondswithinaspecifiedmeasuringperiod,whereneitherarecountedduringunavailabilityperiods(seeITU-TRecommendationG.826(seeannexC))backgroundblockerrorratio:ratiooferroredblocksoverallblockswithinaspecifiedmeasuringperiod,whereneitherarecountedduringunavailabilityperiodsnorduringseverelyerroredseconds(seeITU-TRecommendationG.826(seeannexC))satellitetransmission:transmissionviaanearthorbitingsatellite3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:D2048U2048kbit/sdigitalunstructuredONPleasedlineONPOpenNetworkProvisionNTPNetworkTerminationPointppmpartspermillionPRBS(29-1)PseudoRandomBitSequence(asdefinedinclause2.1ofITU-TRecommendationO.153[2])PRBS(215-1)PseudoRandomBitSequence(asdefinedinclause2.1ofITU-TRecommendationO.151[1])RXReceive(asignalinputateithertheleasedlineinterfaceorthetestequipment)TXTransmit(asignaloutputateithertheleasedlineinterfaceorthetestequipment)UIUnitIntervalSIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)84RequirementsTheperformanceoftheleasedlineshallcomplywiththeserequirementsonlyiftheconditionsofsupplyofthenetworkequipmentprovidingtheNTParemet,(e.g.iftheequipmentisconnectedtoanappropriatepowersupplyonthecustomer'spremises).TheITU-Tattributetechniqueisusedtoexpresstheconnectionrequirements.ThefollowingattributesfromITU-TRecommendationI.140(seeannexC)arespecifiedinthepresentdocument:-informationtransferrate;-informationtransfersusceptance;-structure;-establishmentofcommunication;-symmetry;-communicationconfiguration;-networkperformance.NOTE:"Bitrate"isequivalentto"informationtransferrate"inthepresentdocument.Thefollowingnetworkperformancesub-attributesareconsideredrelevantforthepresentdocument:-transmissiondelay;-jitter;-slip;-error.4.1AttributesTheconnectionattributesaredisplayedintable1.Ineffect,theseattributesdefinetheservicebeingoffered.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.Table1:ConnectionattributesConnectiontypeattributesValueDescriptionNatureReferenceclauseInformationtransfertrate2048±50ppmkbit/sSee5.1.1InformationtransfersusceptanceUnrestricteddigitalSee5.1.2StructureUnstructuredSee5.1.3EstablishmentofcommunicationWithoutuserinterventionSee5.1.4SymmetrySymmetricalinbothdirectionsSee5.1.5CommunicationconfigurationPoint-to-pointSee5.1.6Networkperformancesub-attributesConnectiontypeattributesValueDescriptionNatureReferenceclauseTransmissiondelayTerrestrialandsatelliteoptionsSee5.1.7.1JitterInputandoutputportsSee5.1.7.2Slip5per24hourperiodSee5.1.7.3ErrorparametersTimeintervalwitherroredblocksValueDescriptionNatureReferenceclauseErroredseconds2889per24hourperiodSee5.1.7.4.1Severelyerroredseconds117per24hourperiodSee5.1.7.4.2Backgroundblockerrors22395per24hourperiodSee5.1.7.4.3SIST EN 300 247 V1.2.1:2003

ETSIETSIEN300247V1.2.1(2001-07)94.1.1InformationtransferrateRequirement:Theconnectionshallbecapableoftransferringaninformationrateof2048kbit/s±50ppm.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.2InformationtransfersusceptanceRequirement:Theconnectionshallbecapableoftransferringunrestricteddigitalinformation.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.3StructureRequirement:Theconnectionshallbeunstructured.Thefullbitrateof2048kbit/sshallbeavailabletotheuserforunrestricteddigitalinformationtransfer.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.4EstablishmentofcommunicationRequirement:EstablishmentorreleaseoftheconnectionshallnotrequireanyprotocolexchangeorotherinterventionattheNTPbytheuser.Test:Bydeclaration.4.1.5SymmetryRequirement:Theconnectionshallbesymmetrical,i.e.eachdirectionoftransmissionshallhavethesamenominalcharacteristics,althoughtheactualvaluesshallbeindependent.Test:ThetestshallbeconductedaccordingtoclauseA.2.1.4.1.6CommunicationconfigurationRequirement:Theconnectionconfigurationshallbepoint-to-point.Test:Bydeclaration.4.1.7NetworkperformanceThenetworkperformancesub-attributesaredisplayedintable1.Thevaluesandtheassociatedcompliancetestscanbefoundinthesubsequentclauses.4.1.7.1TransmissiondelayRequirement:Therequirementdependsuponwhethersatellitetransmissionisinvolvedintheconnectionornot:a)forconnectionswheresatellitetransmissionisnotinvolvedtheonewayend-to-enddelayshallbelessthan(10+0,01G)ms,whereGisthegeographicaldistanceinkilometres,asshowninfigure1;orb)forconnectionswheresatellitetransmissionisinvolvedtheone-wayend-to-enddelayshallbelessthan350ms.NOTE1:Requirementsa)
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