SIST EN 300 418 V1.2.1:2004

• Abstract:

  Revision to improve the safety related text following a liaison from TC Safety. Specification of the public network side of the interface and test procedures 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-147-2
• Ref Project: ETSI EN 300 418 V1.2.1 (2001-07) - Access and Terminals (AT); 2 048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation

SIST EN 300 418 V1.2.1:2004 specifies the public network-side presentation of 2 048 kbit/s digital leased lines for the Access and Terminals (AT) area. It covers both D2048U and D2048S on 120 ohm interfaces, and it gives the interface requirements and the test principles used to check them. For engineers, buyers and test labs, it shows what the network termination point must present and how conformance is assessed.

What does SIST EN 300 418 V1.2.1:2004 specify?

SIST EN 300 418 V1.2.1:2004 specifies the technical requirements and test principles for ONP 2 048 kbit/s digital leased line network interfaces. It applies to D2048U and D2048S leased lines presented at Network Termination Points (NTP), including leased lines where setup or release does not require protocol exchange or other intervention at the NTP.

The document is organized into:

• Clause 1 - scope
• Clause 2 - references
• Clause 3 - definitions and abbreviations
• Clause 4 - requirements
• Annex A - normative test methods
• Annex B - normative definition of HDB3 code
• Annex C - informative bibliography

Annex	What it covers
Annex A	Test methods for compliance checks
Annex B	HDB3 code definition
Annex C	Background and related documents

The scope covers physical, mechanical and electrical characteristics, but safety, overvoltage and ElectroMagneticCompatibility (EMC) are outside the scope. The document is intended for the network interface as provided by the leased line provider, and it is used together with the matching connection-characteristics standard for the line type.

What are the key requirements of SIST EN 300 418 V1.2.1:2004?

SIST EN 300 418 V1.2.1:2004 defines the interface presentation for two service types and then sets the port, coding and immunity requirements that make the interface usable in practice. The requirements matter because they tell the provider and equipment designer what must be supported at the public network side, and they tell the test lab what to verify.

Service presentation

Clause 4 states that D2048U is a bidirectional point-to-point digital connection with usable 2 048 kbit/s bitrate, with timing provided by the user, and without network structuring. Clause 4 also states that D2048S is a bidirectional point-to-point digital connection with 1 984 kbit/s information transfer rate and no restriction on binary content, with the frame structure defined in the companion line standard.

Physical connection

Clause 4.1 requires the interface to support hardwired connection, with a termination method for solid conductors in a defined diameter range. Clause 4.1 also allows a socket arrangement by agreement, and it requires a point for connecting the cable shield on the terminal-equipment side. In practice, this affects the connector choice, installation method and EMC design.

Output port

Clause 4.2.1 requires the output signal to use High Density Bipolar code of order 3 (HDB3). It also defines the output pulse shape against a G.703-based mask, and it requires output timing under failure conditions to remain within a tight frequency tolerance when the network presents a failure indication such as Alarm Indication Signal (AIS).

Input port

Clause 4.2.2 requires correct HDB3 decoding, a minimum input return-loss performance, tolerance to cable loss, and immunity to reflections. It also requires the receiver to work without errors in the presence of longitudinal voltage and to meet a minimum impedance to ground. In practice, these clauses address line matching, noise immunity and transformerless implementations.

Scope limits

Clauses 4.3 to 4.5 place safety, overvoltage and EMC outside this document. That means the interface standard must be read together with the relevant safety and EMC standards when designing or approving equipment.

What terms does SIST EN 300 418 V1.2.1:2004 define?

SIST EN 300 418 V1.2.1:2004 defines the terms that describe the line, the interface point and the coding used on the circuit.

• Leased lines - telecommunications facilities provided by a public network with defined transmission characteristics between NTPs and no user-controlled switching.
• Network Termination Point (NTP) - the physical connection point and its technical access specifications at the edge of the public telecommunications network.
• Terminal equipment - equipment intended to connect to the public telecommunications network directly or through interworking.
• PRBS - Pseudo Random Bit Sequence, used here as a test pattern.
• HDB3 - High Density Bipolar code of order 3, the line code used on the interface.
• AIS - Alarm Indication Signal, a failure-related signal sent by the network.
• ONP - Open Network Provision, the regulatory framework referenced by the standard.

Who uses SIST EN 300 418 V1.2.1:2004?

SIST EN 300 418 V1.2.1:2004 is used by leased line providers, telecom equipment manufacturers, conformity test labs and engineers responsible for interface approval. It is relevant when designing the public network side of a 2 048 kbit/s leased line, selecting connectors and shields, or verifying electrical behavior at the NTP. It is also useful for buyers and quality managers who need to specify a compatible leased-line interface in procurement or acceptance checks.

What changed in SIST EN 300 418 V1.2.1:2004 from the previous edition?

SIST EN 300 418 V1.2.1:2004 is described as a revision that introduces necessary changes, including improved safety-related text following liaison from TC Safety. For the unstructured leased line, it supersedes ETS 300 246, which is withdrawn.

Which standards are used with SIST EN 300 418 V1.2.1:2004?

SIST EN 300 418 V1.2.1:2004 cites these documents as normative references or direct companions:

• ITU-T G.703 - basis for the physical and electrical characteristics and the pulse mask
• ITU-T O.151 - source for the PRBS definition used in testing
• EN 300 247 - connection characteristics for D2048U
• EN 300 419 - connection characteristics for D2048S
• EN 300 248 - related terminal equipment interface for D2048U
• EN 300 420 - related terminal equipment interface for D2048S

What does the SIST EN 300 418 V1.2.1:2004 document contain?

SIST EN 300 418 V1.2.1:2004 contains the interface requirements plus a set of test methods that check coding, pulse shape, return loss, cable-loss tolerance, reflection immunity, longitudinal-voltage tolerance, impedance to ground and output timing under failure conditions. Annex A gives the test set-ups and measurement approach, including loopback use, PRBS generation and bridge-based measurements. Annex B gives the HDB3 rule set in code form, and the main text uses that definition to make the output and input requirements testable.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 2 048 kbit/s in za nestrukturirane in strukturirane signale (D2048U in D2048S) - Omrežni vmesnikAccess and Terminals (AT); 2 048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:EN 300 418 Version 1.2.1SIST EN 300 418 V1.2.1:2004en01-oktober-2004SIST EN 300 418 V1.2.1:2004SLOVENSKI
STANDARD
ETSIEN300418V1.2.1(2001-07)EuropeanStandard(Telecommunicationsseries)AccessandTerminals(AT);2048kbit/sdigitalunstructuredandstructuredleasedlines(D2048UandD2048S);NetworkinterfacepresentationSIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)2ReferenceREN/AT-020006Keywordsdigital,interface,leasedline,network,ONP,terminal,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 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)3ContentsIntellectualPropertyRights.5Foreword.5Introduction.61Scope.72References.73Definitionsandabbreviations.83.1Definitions.83.2Abbreviations.84Requirements.84.1Physicalcharacteristics.94.1.1Hardwiredconnection.94.1.2Socketspecification.94.1.3Shieldconnectionpoint.94.2Electricalcharacteristics.104.2.1Outputport.104.2.1.1Signalcoding.104.2.1.2Waveformshape.104.2.1.3Outputtimingunderfailureconditions.114.2.1.4Impedancetowardsground.124.2.1.5Outputreturnloss.124.2.1.6Outputsignalbalance.124.2.1.7Outputtimingandjitter.124.2.2Inputport.124.2.2.1Signalcoding.124.2.2.2Inputreturnloss.124.2.2.3Inputlosstolerance.134.2.2.4Immunityagainstreflections.134.2.2.5Tolerablelongitudinalvoltages.134.2.2.6Impedancetowardsground.134.2.2.7Inputtimingandjittertolerance.134.3Safety.144.4Overvoltage.144.5ElectroMagneticCompatibility(EMC).14AnnexA(normative):Testmethods.15A.1General.15A.1.1Additionalinformationtosupportthetest.15A.1.2Equipmentconnection.15A.2Testmethods.16A.2.1Signalcodingatoutputport.16A.2.2Waveformshapeatoutputport.17A.2.3Returnlossatinputport.18A.2.4Inputlosstoleranceandimmunityagainstreflections.18A.2.5TolerablelongitudinalvoltageandHDB3inputcoding.20A.2.6Impedancetowardsground.21A.2.7Outputtimingunderfailureconditions.21AnnexB(normative):DefinitionofHDB3code.23B.1General.23B.2Definition.23SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)4AnnexC(informative):Bibliography.24History.25SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(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).Inthecaseoftheunstructuredleasedline,thepresentdocumentsupersedesETS300246(withdrawn)(seeannexC).Therearefourotherstandardsdirectlyrelatedtothepresentdocument:-EN300247:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleaseline(D2048U);Connectioncharacteristics";-EN300248:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U);Terminalequipmentinterface";-EN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics";-EN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".ThepresentdocumentisbasedoninformationfromITU-TRecommendationsandETSIpublicationsandtherelevantdocumentsarequotedwhereappropriate.NationaltranspositiondatesDateofadoptionofthisEN:29June2001DateoflatestannouncementofthisEN(doa):30September2001DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):31March2002DateofwithdrawalofanyconflictingNationalStandard(dow):31March2002SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)6IntroductionTheCouncilDirectiveontheapplicationofONPtoleasedlines(92/44/EEC)(seeannexC)concernstheharmonizationofconditionsforopenandefficientaccessto,anduseof,theleasedlinesprovidedoverpublictelecommunicationsnetworks,andtheavailabilitythroughouttheEuropeanUnion(EU)ofaminimumsetofleasedlineswithharmonizedtechnicalcharacteristics.TheconsequenceoftheDirectiveisthattelecommunicationsorganizationswithintheEUshallmakeavailableasetofleasedlinesbetweenpointsinthesecountrieswithspecifiedconnectioncharacteristicsandspecifiedinterfaces.UndertheDirective91/263/EEC(seeannexC),laterreplacedby98/13/EC(seeannexC),terminalequipmentforconnectiontotheseleasedlineswasrequiredtofulfilcertainessentialrequirements.Thepresentversionofthepresentdocumenthasbeenproducedtointroducesomenecessarychanges.ETS300166(seeannexC)andITU-TRecommendationG.703[1]wereusedasthebasisforthenetworkinterfacepresentationrequirements.SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)71ScopeThepresentdocumentspecifiesthetechnicalrequirementsandtestprinciplesforthenetworkinterfacepresentationsofONP2048kbit/sdigitalleasedlinesusing120Ωinterfaces.Thisincludes:-the2048kbit/sdigitalunstructuredleasedline;and-the2048kbit/sdigitalstructuredleasedlinewithaninformationtransferrateof1984kbit/swithoutrestrictiononbinarycontent.AconnectionispresentedviainterfacesatNetworkTerminationPoints(NTP).Thepresentdocumentdefinesthenetworkinterfaceaspresentedbytheleasedlineproviderandshouldbeusedinconjunctionwiththeappropriatecompanionstandard,EN300247[3]orEN300419[5],specifyingtheconnectioncharacteristicsbetweentheNTPsoftheleasedline.Thepresentdocumentandtheappropriateconnectioncharacteristicsstandardtogetherdescribethetechnicalcharacteristicsoftheleasedline.Thepresentdocumentisapplicabletoleasedlines,includingparttimeleasedlines,forwhichtheestablishmentorreleasedonotrequireanyprotocolexchangeorotherinterventionattheNTP.Thepresentdocumentcoversthephysical,mechanicalandelectricalcharacteristics(exceptsafety,overvoltageandEMCaspects)ofthenetworkinterfaceandspecifiestheconformancetestsforequipmentofthekindthatprovidestheinterfacepresentation.Someofthetestsdescribedinthepresentdocumentarenotdesignedtobeappliedtotheinterfaceofaninstalledleasedline;suchtestsmaybeappliedtoequipmentofthekindusedtoprovidetheinterface.Thepresentdocumentdoesnotincludedetailsconcerningtheimplementationofthetestsnordoesitincludeinformationonanyregulationsconcerningtesting.Thereisnorequirementforeachleasedlinetobetestedinaccordancewiththepresentdocumentbeforeitisbroughtinto,orreturnedinto,service.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.[1]ITU-TRecommendationG.703(1998):"Physical/electricalcharacteristicsofhierarchicaldigitalinterfaces".[2]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[3]ETSIEN300247:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleaseline(D2048U);Connectioncharacteristics".[4]ETSIEN300248:"AccessandTerminals(AT);2048kbit/sdigitalunstructuredleasedline(D2048U)Terminalequipmentinterface".[5]ETSIEN300419:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".[6]ETSIEN300420:"AccessandTerminals(AT);2048kbit/sdigitalstructuredleasedlines(D2048S);Terminalequipmentinterface".SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)83Definitionsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:leasedlines:telecommunicationsfacilitiesprovidedbyapublictelecommunicationsnetworkthatprovidedefinedtransmissioncharacteristicsbetweenNTPsandthatdonotincludeswitchingfunctionsthattheusercancontrol,(e.g.on-demandswitching)NetworkTerminationPoint(NTP):allphysicalconnectionsandtheirtechnicalaccessspecificationswhichformpartofthepublictelecommunicationsnetworkandarenecessaryforaccesstoandefficientcommunicationthroughthatpublicnetworkPRBS(215-1):PseudoRandomBitSequence(PRBS)(asdefinedinclause2.1ofITU-TRecommendationO.151[2])terminalequipment:equipmentintendedtobeconnectedtothepublictelecommunicationsnetwork,i.e.:-tobeconnecteddirectlytotheterminationofapublictelecommunicationnetwork;or-tointerworkwithapublictelecommunicationsnetworkbeingconnecteddirectlyorindirectlytotheterminationofapublictelecommunicationsnetwork,inordertosend,process,orreceiveinformation3.2AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmIndicationSignalAMIAlternateMarkInversionCRC-4CyclicRedundancyCheck-4bitD2048S2048kbit/sdigitalstructuredleasedlineD2048U2048kbit/sdigitalunstructuredleasedlinedcdirectcurrentEMCElectroMagneticCompatibilityHDB3HighDensityBipolarcodeoforder3(seeannexB)ISDNIntegratedServicesDigitalNetworkNTPNetworkTerminationPointONPOpenNetworkProvisionppmpartspermillionPRBSPseudoRandomBitSequencermsrootmeansquareRXRXisasignalinput(ateithertheleasedlineinterfaceorthetestequipment,seefigure1)TXTXisasignaloutput(ateithertheleasedlineinterfaceorthetestequipment,seefigure1)4RequirementsTheserequirementsdefinethenetworkinterfacepresentationfor:-the2048kbit/sdigitalunstructuredleasedline(D2048U)whichprovidesabidirectionalpoint-to-pointdigitalconnectionwithausablebitrateof2048kbit/swheretimingisnotprovidedfromthenetwork.Theprovisionofcircuittimingistheresponsibilityoftheuser.Nostructuringofthedataisprovided,orshallberequired,bythenetworkandanystructuringistheresponsibilityoftheuser;and-the2048kbit/sdigitalstructuredleasedline(D2048S)whichprovidesabidirectionalpoint-to-pointdigitalconnectionwithaninformationtransferrateof1984kbit/swithoutrestrictiononbinarycontent.Theframestructureinthe2048kbit/sbitstreamisdefinedinEN300419[5].Anystructuringofthedatawithinthetransparent1984kbit/spartoftheframeistheresponsibilityoftheuser.SIST EN 300 418 V1.2.1:2004

ETSIETSIEN300418V1.2.1(2001-07)9NOTE1:Thenetworkinterfaceisnotdesignedforpowerfeeding.NOTE2:Ifequipmentprovidingtheinterfacerequiresamainssupply,theleasedlineprovidershouldbringthistotheattentionoftheusersothattheusercanprovidemainssupplyback-upfacilities,ifrequired.4.1PhysicalcharacteristicsTheconnectionarrangementsprovidedbytheleasedlineinterfaceshallbesuitableforhardwiredconnection(seeclause4.1.1);however,withtheagreementoftheuser,analternativemeansofconnection,usingasocket,maybeprovided(seeclause4.1.2).Thetransmitpairistheoutputfromthenetworkinterface.Thereceivepairistheinputtothenetworkinterface,asshowninfigure1.Wheretheterms"output"and"input"areusedwithoutqualificationinthepresentdocument,theyrefertothenetworkinterface.NetworkInterfaceTXRXRXTXTerminalEquipmentOutputInputOutputInputFigure1TheuseontheterminalequipmentsideoftheinterfaceofshieldedcablesmaybenecessarytomeetradiationandimmunityrequirementsdefinedinElectroMagneticCompatibility(EMC)standards.ThereforetheNTPisrequiredtoprovideapointforconnectionoftheshield(seeclause4.1.3).4.1.1HardwiredconnectionRequirement:Wheretheleasedlineisbeingpresentedasahardwiredconnection,theleasedlineinterfaceshallprovideameansofterminatingwirewithsolidconductorshavingdiametersintherange0,4mmto0,6mm.Theleasedlineprovidershallprovideinformationontheconfigurationofthemeansofconnection.Test:Thereisnotest.Allsubsequenttestsarecarriedoutviathespecifiedconnectionmethod.4.1.2SocketspecificationThereisnoconstraintonthetypeofsocketthatmaybeusedunderthepresentdocument.NOTE:TheintentionistospecifythesamesocketasisspecifiedforIntegratedServicesDigitalNetwork(ISDN)primaryrateaccess;howeverthisapproachisnotpracticableatpresentsinc
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