SIST EN 300 766 V1.2.1:2004

• Abstract:

  Revision to improve the safety related text following a liaison statement form TC Safety. Specification of the public network interface and test methods for compliance.

• 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-307
• Ref Project: ETSI EN 300 766 V1.2.1 (2001-07) - Access and Terminals (AT); Multiple 64 kbit/s digital unrestricted leased lines with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends (D64M); Connection characteristics and network interface presentation

SIST EN 300 766 V1.2.1:2004 is the Slovenian adoption of ETSI EN 300 766 V1.2.1 for Access and Terminals (AT). It specifies the connection characteristics and public network interface presentation for multiple 64 kbit/s digital unrestricted leased lines with octet integrity when they are presented at a structured 2 048 kbit/s interface at either or both ends. The standard is used by network providers, interface designers, and test laboratories that need a common basis for D64M service definition and compliance testing.

What does SIST EN 300 766 V1.2.1:2004 specify?

SIST EN 300 766 V1.2.1:2004 defines the technical requirements and test principles for a 64 kbit/s point-to-point digital unrestricted leased line with octet integrity in mixed 64 kbit/s and 2 048 kbit/s presentations. It also sets the network interface characteristics for the public network side, while leaving safety, EMC, and overvoltage outside its scope.

The document applies to leased lines, including part-time leased lines, whose establishment or release does not require protocol exchange or other intervention at the Network Termination Point (NTP). It does not apply to terminal equipment.

The standard is organized into:

• Clause 5 - connection characteristics
• Clause 6 - interface characteristics for the 2 048 kbit/s interface
• Clause 7 - interface characteristics for the 64 kbit/s interface
• Clauses 8 to 10 - safety, EMC, and overvoltage, each outside scope
• Annex A - normative test methods
• Annex B - bibliography

What are the key requirements of SIST EN 300 766 V1.2.1:2004?

SIST EN 300 766 V1.2.1:2004 focuses on the service behavior of the leased line and on the electrical presentation at each interface. In practice, it tells a provider or tester what the line must carry, how the octets must appear at the output, and how compliance is checked.

Service and connection behavior

• The connection shall transfer information at a nominal 64 kbit/s rate.
• The connection shall carry unrestricted digital information.
• The connection shall be symmetrical, with the same transfer capability in both directions.
• The line shall be point-to-point and shall establish or release without user intervention at the NTP.

These points define the service a customer actually gets. For procurement or acceptance, they tell you the service is a symmetric, unrestricted leased line rather than a switched or managed data service.

Data integrity and performance

• Clause 5 requires separate octets and octet sequence integrity.
• The line is assessed for transmission delay, jitter, octet slip, errored seconds, and severely errored seconds.
• Availability is not specified in this document.

This matters when a user needs preserved byte boundaries and stable timing, for example for transparent circuit-style data transport. The performance clauses point to the behaviors that can affect real traffic even when the physical layer is up.

2 048 kbit/s interface presentation

Clause 6 defines the structured 2 048 kbit/s side. The interface shall accept and output the frame and multiframe structure from EN 300 419, and the provider and user should agree the time slot used for the leased line.

The clause also covers:

• CRC-4 behavior
• use of the E-bits
• frame synchronization and data transmission capability
• multiframe alignment
• output and input coding, waveform shape, timing, jitter, return loss, loss tolerance, reflection immunity, longitudinal voltage, and impedance towards ground

For practice, this means the mixed service must fit cleanly into a structured E1-style environment and still behave like a 64 kbit/s leased line inside the assigned time slot.

64 kbit/s interface presentation

Clause 7 mirrors the interface checks for the 64 kbit/s side. It covers output signal coding and octet structure, waveform shape, timing, failure timing, jitter, impedance towards ground, longitudinal conversion loss, input coding and octet structure, return loss, loss tolerance, and immunity against reflections.

For users, this is the part that confirms the service can also be presented directly at a 64 kbit/s interface while preserving octet structure and electrical compatibility.

What terms does SIST EN 300 766 V1.2.1:2004 define?

• Network Termination Point (NTP) - the physical network access point and its technical specifications needed for access to the public network.
• Octet slip - the slip of one complete octet.
• Errored second - a second that contains one or more bit errors.
• Severely errored second - a second in which at least 0.1% of bits are errored.
• Pseudo Random Bit Sequence (PRBS) - a defined test bit pattern used to exercise the line during conformance tests.
• CRC-4 - cyclic redundancy check using four bits, used for frame integrity on the 2 048 kbit/s side.
• Terminal equipment (TE) - equipment intended to connect to the public telecommunications network.

Who uses SIST EN 300 766 V1.2.1:2004?

SIST EN 300 766 V1.2.1:2004 is used by public telecommunications network operators, leased-line service providers, interface equipment manufacturers, and conformity test laboratories. It is also relevant to engineers and quality managers who need to define, verify, or buy mixed 64 kbit/s and 2 048 kbit/s leased-line interfaces. The document is especially useful where a provider must prove that a D64M service meets a defined public network interface and test method.

What changed in SIST EN 300 766 V1.2.1:2004 from the previous edition?

SIST EN 300 766 V1.2.1:2004 is described as a revision that improves the safety-related text following a liaison statement from TC Safety. The document is also presented as a delta standard that reuses and adapts requirements from EN 300 288, EN 300 289, EN 300 418, EN 300 419, and EN 300 420 for the mixed 64 kbit/s and 2 048 kbit/s case.

Which standards are used with SIST EN 300 766 V1.2.1:2004?

Normative reference	What it contributes
EN 300 288	64 kbit/s network interface presentation requirements
EN 300 289	64 kbit/s connection characteristics, including delay and error performance
EN 300 418	2 048 kbit/s network interface presentation requirements
EN 300 419	2 048 kbit/s structured leased-line connection characteristics
EN 300 420	64 kbit/s terminal equipment interface
ITU-T I.410	General principles for ISDN user-network interface recommendations
ITU-T O.151	Error performance measuring equipment at primary rate and above
ITU-T O.152	Error performance measuring equipment for 64 kbit/s and N x 64 kbit/s

What does the SIST EN 300 766 V1.2.1:2004 document contain?

SIST EN 300 766 V1.2.1:2004 contains a summary of connection attributes, detailed clauses for 64 kbit/s and 2 048 kbit/s interface behavior, and the associated compliance tests. Annex A provides normative test methods, including the main test configuration, loopback arrangement, stimulus patterns, and monitored results.

The main test in Annex A checks information transfer rate, unrestricted digital transfer, symmetry, frame structure, octet integrity, and CRC-4. The figures illustrate the mixed interface arrangements and the preservation of octets through the assigned time slot.

Annex B is a bibliography that points to the supporting directive and technical recommendations used in the document’s background and test logic.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NAccess and Terminals (AT); Multiple 64 kbit/s digital unrestricted leased lines with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends (D64M); Connection characteristics and network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 766 Version 1.2.1SIST EN 300 766 V1.2.1:2004en01-oktober-2004SIST EN 300 766 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300766V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);Multiple64kbit/sdigitalunrestrictedleasedlineswithoctetintegritypresentedatastructured2048kbit/sinterfaceateitherorbothends(D64M);ConnectioncharacteristicsandnetworkinterfacepresentationSIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)2ReferenceREN/AT-020011Keywordsdigital,interface,leasedline,ONP,testingETSI650RoutedesLuciolesF-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 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.94Overview(informative).95Connectioncharacteristics.105.1Summaryofattributes.115.2Informationtransferrate.115.3Informationtransfersusceptance.115.4Structureandoctetintegrity.115.5Establishmentofconnection.125.6Symmetry.125.7Transmissiondelay.125.8Controlledslip.135.9Erroredseconds.135.10Severelyerroredseconds.135.11Availability.136Interfacecharacteristics-2048kbit/sinterface.146.1Connectionarrangements.146.2Framestructure.146.2.1General.146.2.22048kbit/sdigitalstructuredONPleasedline(CRC-4).146.2.3UseoftheE-bits.146.2.4Framesynchronizationanddatatransmissioncapability.146.2.5Multiframealignment.146.3Outputsignalcoding.156.4Outputwaveformshape.156.5Outputtiming.156.6Outputtimingunderfailureconditions.156.7Outputimpedancetowardsground.156.8Outputjitter.156.9Inputsignalcoding.156.10Inputreturnloss.156.11Inputlosstolerance.166.12Inputimmunityagainstreflections.166.13Tolerablelongitudinalvoltages.166.14Impedancetowardsground.166.15Inputjittertolerance.167Interfacecharacteristics-64kbit/sinterface.167.1Connectionarrangements.167.2Outputsignalcodingandoctetstructure.167.3Outputwaveformshape.167.4Outputtiming.177.5Outputtimingunderfailureconditions.177.6Outputjitter.177.7Impedancetowardsground.177.8Longitudinalconversionloss.17SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)47.9Inputsignalcodingandoctetstructure.177.10Inputjittertolerance.177.11Inputreturnloss.177.12Inputlosstolerance.187.13Immunityagainstreflections.187.14Impedancetowardsground.187.15Longitudinalconversionloss.188Safety.189ElectroMagneticCompatibility(EMC).1810Overvoltage.18AnnexA(normative):Testmethods.19A.1General.19A.1.1Additionalinformationtosupportthetest.19A.1.2Equipmentconnection.19A.2Maintest.20AnnexB(informative):Bibliography.21History.22SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(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)toprovidestandardsforthesupportoftheDirectiveonOpenNetworkProvision(ONP)ofleasedlines(92/44/EEC).Therearesixotherstandardsdirectlyrelatedtothepresentdocument:-EN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation";-EN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics";-EN300290:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Terminalequipmentinterface";-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation";-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics";-EN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.Thepresentdocumenthasbeenwrittenasa"delta"documenttotheexistingstandardsfor64kbit/sand2048kbit/sleasedlines.Itusesrequirementsfromthesestandardsbycross-referencewithmodificationsasnecessarytothetest.Theconfigurationscoveredbythepresentdocumentcouldhavebeenaddressedbymodifyingtheexistingstandardsfor64kbit/sand2048kbit/sleasedlinestomakethemmoremodularsothatthe64kbit/sconnectioncharacteristicscouldbeusedinconjunctionwiththe2048kbit/sstructuredinterface.Insomewaysthiswouldhavebeenatidiersolution,butitwouldinvolveconsiderableadditionalactivitybecausetheexistingstandardsfor64kbit/sand2048kbit/sleasedlineswere,atthetimeofcreationofthepresentdocument(seealsotheintroductionofthepresentdocument),thesubjectofregulationandreferencestothemintheannexoftheONPleasedlineDirectivewouldhavetobechanged.SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)6NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworksandtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.OthercountriesoutsidetheEUmayalsochoosetoprovideleasedlinesaccordingtothestandardsproducedtosupporttheDirective.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexB),laterreplacedby98/13/EC(seeannexB),TerminalEquipment(TE)forconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.TheleasedlinespecifiedinthepresentdocumentisnotincludedintheminimumsetwhoseprovisionisrequiredunderDirective92/44/EEC(seeannexB),howeverthepresentdocumentiswrittenasa"delta"documentbasedonthespecificationsforthe2048kbit/sdigitalstructuredONPleasedline(D2048S)and64kbit/sdigitalunrestrictedONPleasedlinewithoctetintegrity(D64U)leasedlines.ETS300166andITU-TRecommendationG.703(seeannexB)wereusedasthebasisfortheinterfacepresentationrequirements.ETS300167,ITU-TRecommendationsG.704andG.706(seeannexB)wereusedasthebasisforthestructureofthe2048kbit/sinterface.Thepresentdocumentdoesnotapplytoterminalequipment.EN300290[4]applieswithoutmodificationtoTEintendedforconnectiontothe64kbit/sinterfaceoftheleasedline.IntheoryEN300420[6]shouldbemodifiedtodefinethetimeslotstructureforterminalsintendedforconnectionto2048kbit/sinterfacesthatpresent64kbit/sleasedlines.However,themodificationistootrivialtobeworthimplementing.SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesfortheconnectioncharacteristicsandnetworkinterfacepresentationsofa64kbit/spoint-to-pointdigitalunrestrictedleasedlinewithoctetintegritythatisprovidedbetweeneither:-two2048kbit/sstructurednetworkinterfaces;or-a2048kbit/sstructurednetworkinterfaceanda64kbit/sco-directionalnetworkinterface.Morethanoneleasedlineofthetypedescribedinthepresentdocumentmaybeprovidedatany2048kbit/snetworkinterface.Suchleasedlinesmayconnecttothesameordifferentdestinations.Thepresentdocumentiswrittenasa"delta"documentbasedonthefollowingstandards:-EN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation".-EN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics".-EN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,whoseestablishmentorreleasedoesnotrequireanyprotocolexchangeorotherinterventionattheNetworkTerminationPoint(NTP).Thepresentdocumentcoverstheconnectioncharacteristics,andthemechanicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterface,andspecifiesconformancetests.Someofthetestsfortheinterfacepresentationdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.NOTE:Thereisnorequirementforeachleasedlinetobetestedinaccordancewiththepresentdocumentbeforeitisbroughtinto,orreturnedinto,service.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ETSIEN300288:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Networkinterfacepresentation".[2]ETSIEN300289:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U);Connectioncharacteristics".[3]ETSIEN300418:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);Networkinterfacepresentation".SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)8[4]ETSIEN300290:"AccessandTerminals(AT);64kbit/sdigitalunrestrictedleasedlinewithoctetintegrity(D64U)Terminalequipmentinterface".[5]ETSIEN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".[6]ETSIEN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".[7]ITU-TRecommendationI.410(1988):"GeneralaspectsandprinciplesrelatingtoRecommendationsonISDNuser-networkinterfaces".[8]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[9]ITU-TRecommendationO.152(1992):"Errorperformancemeasuringequipmentforbitratesof64kbit/sandN×64kbit/s".3Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:erroredsecond:asecondwithoneormorebiterrorsframe:sequenceof256bitsofwhichthefirst8bitsdefinetheframestructureleasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweennetworkterminationpointsandthatdonotincludeswitchingfunctionsthattheusercancontrol(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkoctetslip:slipofonecompleteoctetPRBS(215-1):PseudoRandomBitSequence(PRBS)asdefinedinclause2.1ofITU-TRecommendationO.151PRBS(211-1):PseudoRandomBitSequence(PRBS)asdefinedinclause2.1ofITU-TRecommendationO.152severelyerroredsecond:asecondwhereatleast0,1%ofthebitsareerroredslip:oneormoreextraormissingconsecutiveunitintervalsinthebitstreamtimeslot:inthecontextofthepresentdocument,atimeslotisaperiodofnominally3,90625µs(8bits).Eachframeofnominally125µsissubdividedinto32timeslotsnumbered0-31terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation.SIST EN 300 766 V1.2.1:2004

ETSIETSIEN300766V1.2.1(2001-07)93.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:CRC-4CyclicRedundancyCheck(usingfourbits)D2048S2048kbit/sdigitalstructuredONPleasedlineD64MMultiple64kbit/sdi
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