SIST EN 300 011-1 V1.2.2:2003
(Main)Integrated Services Digital Network (ISDN); Primary rate User Network Interface (UNI); Part 1: Layer 1 specification
- Abstract
Maintenance work : update of safety provisions
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 011-1 V1.2.2:2003 is the Slovenian adoption of the European Telecommunications Standard EN 300 011-1 Version 1.2.2. It specifies the layer 1 requirements and test principles for the Integrated Services Digital Network (ISDN) primary rate User Network Interface (UNI), for equipment used on customers’ premises. The document covers physical, electrical and functional characteristics, plus the information exchange needed with higher layers.
What does SIST EN 300 011-1 V1.2.2:2003 specify?
SIST EN 300 011-1 V1.2.2:2003 specifies requirements and test principles for the 2048 kbit/s ISDN primary rate UNI. In practice, it tells manufacturers and operators how the interface must behave at layer 1 so that equipment can interwork across countries that apply the standard.
The scope applies to equipment with interface IA or IB, at the S, T and S/T reference points of the ISDN reference configuration, and to ISDN channel arrangements at primary rate. It is aimed at customer-premises equipment connected to the UNI.
The document also states what it does not cover:
- safety requirements
- interface or equipment overvoltage protection requirements
- immunity against electromagnetic interference
- emission limitation requirements
Clause 1 gives the scope, clause 2 lists references, clause 3 defines terms and abbreviations, clauses 4 to 9 cover configuration, functional behavior, interface procedure, maintenance, electrical characteristics and power feeding.
| Annex | What it covers |
|---|---|
| Annex A | Application of the document to the S reference point |
| Annex B | Characteristics of loopbacks |
| Annex C | Overview of technical changes to edition 1 |
What are the key requirements of SIST EN 300 011-1 V1.2.2:2003?
SIST EN 300 011-1 V1.2.2:2003 fixes the layer 1 behavior of the interface in a very specific way. The main practical points are the allowed configuration, the frame structure, the signalling and maintenance rules, the electrical characteristics, and the power-feeding arrangement.
- Point-to-point only - Clause 4 restricts the primary rate interface to point-to-point operation. This matters because the interface is designed for one transmitter and one receiver in each direction, not shared multi-drop wiring.
- Cable and connector rules - Clause 4 requires symmetrical cable impedance of 120 Ω within the stated frequency range and uses the connector defined in EN 60603-7. This is what installers and equipment designers must match for reliable transmission.
- Channel and frame organization - Clause 5 assigns B channels, the D channel, H0 and H1 channels to defined timeslots, with 32 timeslots per frame and 8 bits per timeslot. For implementation, this determines how traffic is mapped into the 2048 kbit/s stream.
- Always active, no activation sequence - Clause 5 says the primary rate UNI is active at all times and no activation/deactivation procedure is applied at the interface. Equipment therefore has to support continuous interface presence.
- Line coding and timing - Clause 5 requires High-Density Bipolar 3 (HDB3) line coding, network-derived timing for the Network Termination (NT), and timing recovery at the Terminal Equipment (TE). This is the basis for interoperability and synchronization.
- Frame alignment and CRC-4 - Clause 6 defines loss and recovery of basic frame alignment, CRC multiframe alignment, and CRC bit monitoring. These rules are used to detect false framing and to report errors accurately.
- Maintenance signalling - Clauses 6 and 7 define Alarm Indication Signal (AIS), Remote Alarm Indication (RAI), Loss Of Signal (LOS), and the associated state tables and timers. In practice, this tells equipment when to raise alarms, pass them on, and confirm persistent faults before changing state.
- Electrical performance and jitter - Clause 8 sets the nominal bitrate at 2048 kbit/s, defines waveform shape and return loss, and gives input and output jitter limits. This is what testing labs and buyers use to judge physical conformance.
- Power feeding - Clause 9 allows power feeding over a separate pair of wires, with at least 10 W available at the NT1 and a feeding voltage from -20 V to -57 V relative to ground. This is relevant when the interface powers customer-side network termination.
What terms does SIST EN 300 011-1 V1.2.2:2003 define?
- Alternate Mark Inversion (AMI) - A coding method where ones alternate in polarity and zeros are spaces.
- High-Density Bipolar 3 (HDB3) - A modified AMI code that replaces long runs of zeros to preserve timing and avoid dc content.
- Network Termination Type 1 (NT1) - The functional group that provides physical termination, timing and layer 1 maintenance functions on the network side.
- Network Termination Type 2 (NT2) - The functional group that includes layer 2 and layer 3 handling, switching, concentration and related layer 1 functions.
- Terminal Equipment (TE) - Equipment that provides interface IA on the user side.
- Remote Alarm Indication (RAI) - A layer 1 defect indication sent in bit A of timeslot 0 to signal loss of layer 1 capability.
- Alarm Indication Signal (AIS) - An all-ones signal used to indicate loss of layer 1 capability in the network-to-user direction.
- Cyclic Redundancy Check (CRC) - The error-detection method used here for multiframe protection and error reporting.
Who uses SIST EN 300 011-1 V1.2.2:2003?
SIST EN 300 011-1 V1.2.2:2003 is used by network operators, equipment manufacturers, test laboratories, and engineering teams that design or maintain ISDN primary rate access. It is also relevant to buyers and quality managers who need to verify that customer-premises equipment, Network Termination equipment, or PTNX-related installations fit the required interface behavior.
The standard is especially useful for:
- TE and NT designers working on layer 1 implementation
- compliance and conformance test teams
- maintenance engineers handling alarms, loopbacks and fault localization
- operators and integrators working with primary rate customer access
What changed in SIST EN 300 011-1 V1.2.2:2003 from the previous edition?
Annex C lists the technical changes from edition 1. The changes include updated synchronization limits for TE connected only to the T reference point, restriction of one network option to PTNX interconnection using unstructured leased lines, revised network-side state handling, reduced maximum output jitter in one measurement band, increased minimum power at the NT, added or moved jitter requirements, and the definition of a layer 3 control mechanism for loopback 4.
Which standards are used with SIST EN 300 011-1 V1.2.2:2003?
The document is based on ITU-T Recommendation I.431 and is affected by ITU-T Recommendations G.703, G.704 and G.706. It also cites ITU-T I.411 and I.412 for reference configurations and interface structures, EN 60603-7 for the connector, and ETSI ETS 300 233 for access digital section and related maintenance behavior.
The foreword also names Part 2, which covers conformance tests for interface IA and IB, and Part 3, which provides the ICS and IXIT proformas for interface IA and IB.
What does the SIST EN 300 011-1 V1.2.2:2003 document contain?
The document contains signal tables, state matrices, frame and multiframe structure rules, CRC-4 procedures, timing and jitter limits, electrical test conditions, and power-feeding requirements. It also includes a longitudinal-voltage test arrangement, a pulse mask for the 2048 kbit/s output signal, and loopback characteristics for maintenance use.
Annex A adapts the layer 1 rules to the S reference point and includes the CRC-DISABLE management function. Annex B describes loopbacks for customer access and customer installations, including their location, control mechanism and intended use in failure localization and verification.
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Frequently Asked Questions
SIST EN 300 011-1 V1.2.2:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Primary rate User Network Interface (UNI); Part 1: Layer 1 specification". This standard covers: Maintenance work : update of safety provisions
Maintenance work : update of safety provisions
SIST EN 300 011-1 V1.2.2:2003 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 011-1 V1.2.2:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalno omrežje z integriranimi storitvami (ISDN) – Primarni
vmesnik uporabnik-omrežje (UNI) – 1. del: Specifikacija prve plastiIntegrated Services Digital Network (ISDN); Primary rate User Network Interface (UNI); Part 1: Layer 1 specification33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:EN 300 011-1 Version 1.2.2SIST EN 300 011-1 V1.2.2:2003en01-december-2003SIST EN 300 011-1 V1.2.2:2003SLOVENSKI
STANDARD
ETSIEN300011-1V1.2.2(2000-05)EuropeanStandard(Telecommunicationsseries)IntegratedServicesDigitalNetwork(ISDN);PrimaryrateUserNetworkInterface(UNI);Part1:Layer1specificationSIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)2ReferenceREN/TM-06017-2KeywordsISDN,layer1,primary,rate,transmission,UNIETSI650RoutedesLuciolesF-06921SophiaAntipolisCedex-FRANCETel.:+33492944200Fax:+33493654716SiretN°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:editor@etsi.frCopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)3ContentsIntellectualPropertyRights.6Foreword.61Scope.72References.73Definitions,symbolsandabbreviations.83.1Definitions.83.2Symbols.103.3Abbreviations.104Typeofconfiguration.114.1Point-to-point.114.2Locationofinterface.114.3Interfacewiring.114.4Interfaceconnector.115Functionalcharacteristics.125.1Summaryoffunctions(layer1).125.2Interchangecircuits.135.3Activation/deactivation.135.4Definitionofprimitives.155.5Framestructure.155.5.1Numberofbitspertimeslot.155.5.2Numberoftimeslotsperframe.155.5.3Assignmentsofbitsintimeslot0.165.5.4DescriptionoftheCRC-4procedureinbit1oftheframe.165.5.4.1Allocationofbit1to8oftheframeforacompletemultiframe.165.5.4.2Sub-Multiframe(SMF).165.5.4.3Useofbit1in2048kbit/sCRC-4multiframe.175.5.5CyclicRedundancyCheck(CRC).175.5.5.1Multiplication/divisionprocess.175.5.5.2Encodingprocedure.175.5.5.3Decodingprocedure.175.6Bitsequenceindependence.175.7Linecode.175.8Timingconsiderations.186Interfaceprocedure.186.1Definitionofsignalsattheinterface.186.2Definitionsofstatetablesatnetworkandusersides.196.3Layer1statesontheusersideoftheinterface.206.4Layer1statesatthenetworksideoftheinterface.216.5Statetables.226.6Allocationoftimeslots.246.7Interframe(layer2)timefill.256.8FramealignmentandCRC-4procedures.256.8.1Lossandrecoveryofbasicframealignment.256.8.1.1Lossofbasicframealignment.256.8.1.2Strategyforbasicframealignmentrecovery.256.8.2CRCmultiframealignmentusinginformationinbit1ofthebasicframe.256.8.3CRCbitmonitoring.266.8.3.1Monitoringprocedure.266.8.3.2Monitoringforfalsebasicframealignment.266.8.3.3ErrorperformancemonitoringusingCRC-4.277Maintenanceattheinterface.277.1Definitionsofmaintenancesignals.27SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)47.2UseofCRCprocedure.277.2.1Introduction.277.2.2LocalizationoftheCRCfunctionsfromtheuserpointofview.287.2.2.1NoCRCprocessinginthetransmissionlink.287.2.2.2CRCprocessinginthedigitaltransmissionlink.287.3Maintenancefunctions.287.3.1Generalrequirements.287.3.2Maintenancefunctionsontheuserside.297.3.2.1Anomaliesanddefectdetection.297.3.2.2Detectionofdefectindicationsignals.297.3.2.3Consequentactions.297.3.3Maintenancefunctionsonthenetworkside.307.3.3.1Defectdetection.307.3.3.2Detectionofdefectindicationsignals.307.3.3.3Consequentactions.308Electricalcharacteristics.318.1Typeofinterface.318.2Specificationsattheoutputports.318.2.1Bitrate.318.2.2Waveformshape.328.2.3Returnlossattheoutputport.338.2.4Impedancetowardsgroundoftheoutputport.338.3Specificationattheinputports.338.3.1Receiversensitivity.338.3.2Returnlossattheinputport.338.3.3Inputportimmunityagainstreflections.338.3.4Tolerablelongitudinalvoltage.348.3.5Impedancetowardsgroundoftheinputport.348.4Jitter.348.4.1Generalconsiderations.348.4.2MinimumtolerancetojitterandwanderatTEinputs.358.4.2.1TolerableinputjitterwhenconnectedatT,SorS/Treferencepoint.358.4.2.2Tolerableinputjitterwhenconnectedtoleasedlines.368.4.3TEandNT2outputjitteratinterfaceIA.368.4.3.1TEandNT2withonlyoneUNI.368.4.3.2TEandNT2withmorethanoneUNItothesamepublicISDN.378.4.3.3TEandNT2designedforinterconnectionvialeasedlines.378.4.4MinimumtolerancetojitterandwanderatNTinputs.378.4.4.1TolerableinputjitteratTreferencepoint.378.4.4.2Tolerableinputjitteratleasedlinesinput.389Powerfeeding.389.1Provisionofpower.389.2PoweravailableattheNT.399.3Feedingvoltage.399.4Protectionrequirements.39AnnexA(normative):ApplicationofthepresentdocumenttotheSreferencepoint.40A.1Scope.40A.2Requirements.40A.2.1Timingconsiderations.40A.2.2Jitter,generalconsiderations.40A.2.3FramealignmentandCRC-4procedures.40SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)5A.3Interfacewiring.41A.4LoopbacksrequiredatSreferencepoint.41AnnexB(normative):Characteristicsofloopbacks.42B.1Introduction.42B.2Characteristicsofloopbackatthenetworkside.42B.3Characteristicsofloopbacksforprimaryratecustomerinstallations.42AnnexC(informative):Overviewoftechnicalchangestoedition1.43Bibliography.44History.45SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)6IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeTransmissionandMultiplexing(TM).ThepresentdocumentaimstomeeturgentrequirementsofnetworkoperatorsandequipmentmanufacturerswhoaredesigningequipmenttooperatewithanIntegratedServicesDigitalNetwork(ISDN)primaryrateaccessUserNetworkInterface(UNI).ThepresentdocumentisbaseduponITU-TRecommendationI.431[14]andprovidesmodificationsandfurtherrequirementstothatdocument.ItalsoisaffectedbyITU-TRecommendationsG.703[15],G.704[16]andG.706[17],andmodificationstotheseITU-TRecommendationsareprovidedwithinthepresentdocument.ThepresentdocumentalsotakesintoaccountrequirementscontainedinECMA104[13]:"Physicallayerattheprimaryrateaccessinterfacebetweendataprocessingequipmentandprivateswitchingnetworks(1985)",whicharegiveninannexA.Thepresentdocumentconsistsof3partsasfollows:Part1:"Layer1specification";Part2:"ConformancetestspecificationforinterfaceIAandIB";Part3:"ImplementationConformanceStatement(ICS)andImplementationeXtraInformationforTesting(IXIT)proformaspecificationforlnterfaceIAandIB".Thepresentdocumentincludeseditorialimprovementsofthesafetyrelatedclauses.NationaltranspositiondatesDateoflatestannouncementofthisEN(doa):31August2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):29February2001DateofwithdrawalofanyconflictingNationalStandard(dow):29February2001SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)71ScopeThepresentdocumentspecifiesrequirementsandtestprinciplesfortheISDN2048kbit/sprimaryrateUNIincludingthephysical,electricalandfunctionalcharacteristicsandtheinformationexchangewithhigherlayers.Compliancewiththepresentdocumentensuresthat,withregardtolayer1interfaceaspects,equipmentforusewithISDNprimaryrateaccessisportablewithincountriesthatadheretothepresentdocumentand,furthermore,thatinterworkingwithhigherlayerprotocolsforISDNissupported.ThepresentdocumentisapplicabletoequipmenthavinginterfaceIAorIBfortheconnectiontotheISDNprimaryrateUNIintendedtobeinstalledoncustomers'premises.InaccordancewithITU-TRecommendationI.411[1],thepresentdocumentistobeappliedtointerfacesatreferencepointsS,TandS/T(coincidentSandT)oftheISDNreferenceconfiguration.ThepresentdocumentisapplicableforISDNchannelarrangementsasdefinedinITU-TRecommendationI.412[2],asfarastheprimaryrateat2048kbit/sisconcerned.AnnexAspecifiesadditionalrequirementsforinterfacesatreferencepointS.Thepresentdocumentdoesnotspecify:-safetyrequirements;-interfaceorequipmentovervoltageprotectionrequirements;-immunityrequirementsagainstelectromagneticinterferences;-emissionlimitationrequirements.2ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.• Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.• Foraspecificreference,subsequentrevisionsdonotapply.• Foranon-specificreference,thelatestversionapplies.• Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ITU-TRecommendationI.411(1993):"ISDNuser-networkinterfaces-Referenceconfigurations".[2]ITU-TRecommendationI.412(1988):"ISDNuser-networkinterfaces-Interfacestructuresandaccesscapabilities".[3]ITU-TRecommendationO.151(1992):"Errorperformancemeasuringequipmentoperatingattheprimaryrateandabove".[4]EN60603-7(1993):"Connectorsforfrequenciesbelow3MHzforusewithprintedboards-Part7:Detailspecificationforconnectors,8-way,includingfixedandfreeconnectorswithcommonmatingfeatures".[5]ITU-TRecommendationO.162(1992):"Equipmenttoperformin-servicemonitoringon2048,8448,34368and139264kbit/ssignals".[6]ITU-TRecommendationM.20(1992):"Maintenancephilosophyfortelecommunicationnetworks".[7]ETSIETR001:"IntegratedServicesDigitalNetwork(ISDN);Customeraccessmaintenance".SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)8[8]ETSIETS300166(1993):"TransmissionandMultiplexing(TM);Physicalandelectricalcharacteristicsofhierarchicaldigitalinterfacesforequipmentusingthe2048kbit/s-basedplesiochronousorsynchronousdigitalhierarchies".[9]ETSIETS300233(1994):"IntegratedServicesDigitalNetwork(ISDN);AccessdigitalsectionforISDNprimaryrate".[10]ETSIETS300247(1995):"BusinessTelecommunications(BT);OpenNetworkProvision(ONP)technicalrequirements;2048kbit/sdigitalunstructuredleasedline(D2048U)Connectioncharacteristics".[11]ETSIETS300419(1995):"BusinessTeleCommunications(BTC);2048kbit/sdigitalstructuredleasedlines(D2048S);Connectioncharacteristics".[12]CCITTRecommendationX.200(1994):"Informationtechnology-OpenSystemsInterconnection-Basicreferencemodel:Thebasicmodel".[13]ECMA104:"PhysicalLayeratthePrimaryRateAccessInterfacebetweenDataProcessingEquipmentandPrivateSwitchingNetworks".[14]ITU-TRecommendationI.431(1993):"Primaryrateuser-networkinterface-Layer1specification".[15]ITU-TRecommendationG.703(1991):"Physical/electricalcharacteristicsofhierarchicalinterfaces".[16]ITU-TRecommendationG.704(1995):"Synchronousframestructuresusedat1544,6312,2048,8488and44736kbit/shierarchicallevels".[17]ITU-TRecommendationG.706(1991):"Framealignmentandcyclicredundancycheck(CRC)proceduresrelatingtobasicframestructuresdefinedinRecommendationG.704".[18]CCITTRecommendationG.811(1988):"Timingrequirementsattheoutputsofprimaryreferenceclockssuitableforplesiochronousoperationofinternationaldigitallinks".[19]ITU-TRecommendationG.823(1993):"Thecontrolofjitterandwanderwithindigitalnetworkswhicharebasedonthe2048kbit/shierarchy".[20]CCITTRecommendationI.604(1988):"ApplicationofmaintenanceprinciplestoISDNprimaryrateaccesses".[21]ITU-TRecommendationO.9(1999):"Measuringarrangementstoassessthedegreeofunbalanceaboutearth".[22]CCITTRecommendationO.171(1992):"Timingjittermeasuringequipmentfordigitalsystems".3Definitions,symbolsandabbreviations3.1DefinitionsForthepurposesofthepresentdocument,thefollowingdefinitionsapply:AlternateMarkInversion(AMI):isacodewhereONEsarerepresentedbyalternatepositiveandnegativepulses,andZEROsbyspaces.High-DensityBipolar3(HDB3):isamodifiedAMIcode.Anexceptionoccursforblocksof4successiveZEROs.Eachblockof4successiveZEROsisreplacedbyOOOVorBOOVwhereBrepresentsaninsertedpulseconformingtotheAMIandVrepresentsanAMIviolation.ThechoiceofOOOVorBOOVismadesothatthenumberofBpulsesbetweenconsecutiveVpulsesisodd.Inotherwords,successiveVpulsesareofalternatepolaritysothatnodirectcurrent(dc)componentisintroduced.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)9interfaceIA:usersideoftheISDNUNIfortheprimaryrateaccess.interfaceIB:networksideoftheISDNUNIfortheprimaryrateaccess.networkside:NT1,LTandETfunctionalgroupsincaseofaninterfaceattheTreferencepoint;orrelevantpartsoftheNT2functionalgroupincaseofaninterfaceattheSreferencepoint.networkoption1:thedigitallinkbetweeninterfaceattheTandVreferencepointdoesnotprovideaCRC-4processing,i.e.theCRC-4isterminatedintheTEandtheET.Thisdigitallinkiscalledtobe"withoutCRCprocessing"(seesubclause7.2.2.2).NOTE1:ThisoptionisnotprovidedbythepublicISDNattheTreferencepoint.HoweveritmightbeusedforPrivateTelecommunicationsNetworkExchange(PTNX)interconnectionusingunstructured2048kbit/sleasedlines.networkoption2:thedigitallinkbetweeninterfaceattheTandVreferencepointprovidesCRC-4processingintheNT1andtheETaccordingETR001[7].ThereforethecombinationsofCRC-4errorinformationandRemoteAlarmIndication(RAI)indicatethefaultcondition;FC1orFC4(seesubclause7.2.2.1).NOTE2:Option3ofCCITTRecommendationI.604[20]withCRC-4processinginNT1,LTandETisnotrelevantforthepresentdocument.NetworkTermination(NT):anequipmentprovidinginterfaceIB.NOTE3:Thistermisusedinthepresentdocumenttoindicatenetwork-terminatingaspectsofNT1andNT2functionalgroupswherethesehaveanIBinterface.NetworkTerminationType1(NT1):thisfunctionalgroupincludesfunctionsbroadlyequivalenttolayer1(physical)oftheOpenSystemInterconnection(OSI)referencemodel.Thesefunctionsareassociatedwiththeproperphysicalandelectromagneticterminationofthenetwork.NT1functionsare:-linetransmissiontermination;-layer1maintenancefunctionsandperformancemonitoring;-timing;-layer1multiplexing;-interfacetermination.NetworkTerminationType2(NT2):thisfunctionalgroupincludesfunctionsbroadlyequivalenttolayer1andhigherlayersoftheCCITTRecommendationX.200[12]referencemodel.PrivateTelecommunicationNetworkExchanges(PTNXs),localareanetworksandterminalcontrollersareexamplesofequipmentorcombinationsofequipmentthatprovideNT2functions.NT2functionsinclude:-layer2andlayer3protocolhandling;-layer2andlayer3multiplexing;-switching;-concentration;-maintenancefunctions;-interfaceterminationandotherlayer1functions.PrivateTelecommunicationNetworkExchange(PTNX):anodalidentityinaprivatetelecommunicationnetworkwhichprovidesautonomousandautomaticswitchingandcallhandlingfunctionsusedfortheprovisionoftelecommunicationserviceswhicharebasedonthedefinitionsforthoseofthepublicISDN.PrivateNetworkTermination(PNT):aremoteunitofequipmentwhichterminatesatransmissionsystememployedbetweenthePTNXandtheinterfaceIBandtheSreferencepoint.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)10TerminalAdapter(TA):anequipmentwithinterfaceIAandoneormoreauxiliaryinterfacesthatallownon-ISDNterminalstobeservedbyanISDNUNI.TerminalEquipment(TE):anequipmentprovidinganinterfaceIA.NOTE4:Thistermisusedinthepresentdocumenttoindicateterminal-terminatinglayer1aspectsofTE1,TAandNT2functionalgroups,wherethesehaveanIAinterface.NOTE5:InannexA,thisdefinitionapplieswiththeexceptionthattheNT2functionalgroupingisnotcovered.TerminalEquipmentType1(TE1):thisfunctionalgroupincludesfunctionsbelongingtothefunctionalgroupTE,andwithaninterfacethatcomplieswiththeISDNUNIstandard.userside:terminalterminatinglayer1aspectsofTE1,TAandNT2functionalgroups.3.2SymbolsForthepurposesofthepresentdocument,thefollowingsymbolsapply:ONEbinary"1"ZERObinary"0"3.3AbbreviationsForthepurposesofthepresentdocument,thefollowingabbreviationsapply:AISAlarmIndicationSignalAMIAlternateMarkInversionCRCCyclicRedundancyCheckdcdirectcurrentEMCElectroMagneticCompatibilityETExchangeTerminationFCFaultConditionHDB3High-DensityBipolar3(linecode)ISDNIntegratedServiceDigitalNetworkLOSLossOfSignalMPHManagement(entity)-PHysical(layer)[primitive]MPH-AIMPHActivateIndicationMPH-EIMPHErrorIndicationMTIEMaximumTimeIntervalErrorNOFNormalOperationalFramesNTNetworkTerminationPHPHysical(layer)PH-AIPH-ActivateIndicationPH-DIPH-DeactivateIndicationPNTPrivateNetworkTerminationPRBSPseudo-RandomBinarySequencePTNPrivateTelecommunicationsNetworkPTNXPrivateTelecommunicationsNetworkExchangeRAIRemoteAlarmIndicationSMFSub-MultiFrameTATerminalAdapterTETerminalEquipmentUNIUserNetworkInterfaceSIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)114TypeofconfigurationThetypeofconfigurationappliesonlytothelayer1characteristicsoftheinterfaceanddoesnotimplyanyconstraintsonmodesofoperationathigherlayers.4.1Point-to-pointTheprimaryrateshallsupportonlythepoint-to-pointconfiguration.Point-to-pointconfigurationatlayer1impliesthatforeachdirectiononlyonesource(transmitter)andonesink(receiver)areconnectedtotheinterface.Themaximumreachoftheinterfaceinthepoint-to-pointconfigurationislimitedbyspecificationfortheelectricalcharacteristicsoftransmittedandreceivedpulsesandthetypeofinterconnectingcable.4.2LocationofinterfaceTheelectricalcharacteristicsapplytotheinterfacepointsIAandIBoffigure1.TENTIAIBNOTE:IAislocatedattheinputandoutputportsoftheTE.IBislocatedattheinputandoutputportsoftheNT.Figure1:Locationofinterfaces4.3InterfacewiringThemagnitudeofthecharacteristicimpedanceofsymmetricaltypeinterfacecableshallbe120Ω±20%inafrequencyrangefrom200kHzto1MHzand120Ω±10%at1MHz.Theuseofshieldedinterfacecablesmayberequiredtomeetradiationemissionandimmunityrequirements.ThereforetheTerminalEquipment(TE)andtheNetworkTermination(NT)shallhaveprovidedapointontheequipmentwhereashieldoftheinterfacecablecan,andifprovidedshallbeconnectedto.ThispointshallbedesignedrespectingEMCrequirementsprovidingaccesstothesignalreferenceforthetransmitterandreceiveroftheequipmentinterface.Applicationofinterfacecablewithindividuallyshieldedpairsorwithacommonshieldforbothpairsshallbepossible.4.4InterfaceconnectorTheinterfaceconnectorandcontactassignmentsisspecifiedinEN60603-7[4]andthecontactassignmentsintable1.HoweverpermanentwiringconnectionsfromTEtoNTarealsopermitted.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)12Table1:contactassignmentsContactNetworkinterface1&2Transmitpair3Unused4&5Receivedpair6Unused7Unused8UnusedNOTE:Thetransmitpairistheoutputfromthenetworkinterface.Thereceivepairistheinputtothenetworkinterface5Functionalcharacteristics5.1Summaryoffunctions(layer1)TENTB-,H0-orH1-channels<--->B-,H0-orH1-channels1D-channel64kbit/s<--->1D-channel64kbit/sBittiming<--->BittimingOctettiming<--->OctettimingFramealignment<--->FramealignmentPowerfeeding<---->PowerfeedingMaintenance<--->MaintenanceCRCprocedure<--->CRCprocedureNOTE:Thispowerfeedingfunctionusesaseparatepairofwires.Figure2:FunctionalcharacteristicsB-channel:Thisfunctionshallprovideforthebi-directionaltransmissionofindependentB-channelsignalseachhavingabitrateof64kbit/s.AB-channelmaybeassignedtoanytimeslot,excepttimeslots0and16.D-channel:Thisfunctionshallprovideforthebi-directionaltransmissionofoneD-channelsignalatabitrateof64kbit/s.TheD-channelshallbeassignedtotimeslot16.H0-Channel:Thisfunctionshallprovideforthebi-directionaltransmissionofupto5independentH0signal,eachhavingabitrateof384kbit/s.AnH0-channelmaybeassignedtoany6timeslots,excepttimeslots0and16.H1-channel:Thisfunctionshallprovideforthebi-directionaltransmissionof1H1channelhavingabitrateof1920kbit/s.AnH1-channelshallbeassignedtotimeslots1to15and17to31.Bitriming:Thisfunctionshallprovidebit(signalelement)timingtoenabletheTEorNTtorecoverinformationfromtheaggregatebitstream.Octettiming:Thisfunctionshallprovide8kHztimingtowardsTEorNTforthepurposeofsupportinganoctetstructureforvoicecodersandforothertimingpurposesasrequired.Framealignment:ThisfunctionshallprovideinformationtoenabletheTEorNTtorecoverthetime-division-multiplexedchannels.Timeslot0shallprovidetheframealignmentinaccordancewithsubclause6.8.1.Powerfeeding:ThisfunctionshallprovideforthecapabilitytotransferpoweracrosstheinterfacetowardstheNT1.Maintenance:Thisfunctionshallprovideinformationconcerningoperationalorfailureconditionsoftheinterface.ThenetworkreferenceconfigurationformaintenanceactivitiesonprimaryratesubscriberaccessisgiveninETR001[7].CyclicRedundancyCheck(CRC)-4procedure:Thisfunctionshallprovidefortheprotectionagainstfalseframingandmayprovideforerrorperformancemonitoringoftheinterface.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)135.2InterchangecircuitsTwointerchangecircuits,oneforeachdirection,shallbeusedforthetransmissionofdigitalsignals.Allthefunctionslistedabove,withtheexceptionofpowerfeedingandpossiblymaintenance,arecombinedintotwocompositedigitalsignals,oneforeachdirectionoftransmission.Ifpowerfeedingviatheinterfaceisprovided,anadditionalinterchangecircuitshallbeusedforpowerfeeding.Thetwowiresofthepairscarryingthedigitalsignalmaybereversed.5.3Activation/deactivationTheinterfacesfortheprimaryrateUNIshallbeactiveatalltimes.Noactivation/deactivationproceduresshallbeappliedattheinterface.However,forconsistencyinthelayermodelbetweenprimaryrateandbasicratethesamesetofprimitivesshallbeused.Theexchangeoftheseprimitivesandstatechangesareillustratedinfigure3.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)14InformationtransfernotavailableInformationtransferavailablePH-DIPH-DATAPH-DATAPH-AIPH-DIPH-AIInformationtransfernotavailable,maintenanceMPH-AIMPH-EIMPH-LxARMPH-AIa)Layer1-Layer2b)Layer1-Management;Usersidec)Layer1-Management;NetworksidePH-ARInformationtransfernotavailableInformationtransferavailableMPH-DIMPH-AIMPH-AIMPH-DIMPH-EIInformationtransfernotavailableInformationtransferavailableMPH-DIMPH-AIMPH-DIMPH-EIMPH-DRrequestindicationNOTE:Allpossibletransitionsareshown;refertoETS300233[9]forfurtherinformationaboutmaintenanceprocedures.Figure3:ExchangeofprimitivesSIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)155.4DefinitionofprimitivesTheprimitivesgivenintable2shallbeusedbetweenlayers1and2andbetweenlayer1andthemanagemententity.Table2:PhysicallayerprimitivesSpecificnameParameterParameterdatacontentREQUESTINDICATIONPriorityindicatorParameterdataLayer1<->Layer2PH-DATAU/NU/NX(seenote2)XDL-PDUPH-ACTIVATEU/N(seenote3)U/N--PH-DEACTIVATE-U/N--Layer1<->ManagementMPH-ERROR-U/N-XTypeoferrorMPH-ACTIVATE-U/N--MPH-DEACTIVATEN(seenote4)U/N--MPH-LxACTIVATEN(seenote1)--XLoopbackindicatorU=Existsatuserside;N=Existsatnetworkside;X=Exists;-=DoesnotexistNOTE1:Thisisusedinassociationwithaccessdigitalsectionfunctionswithinthenetworkside;seeETS300233[9].NOTE2:Priorityindicatorappliesonlytotherequesttype.Thepriorityindicatorshallbeusedtogiveprioritytoinformationbelongingtopriorityclass1ifqueuesforDL-PDUsareimplementedatlayer1.NOTE3:Thisprimitiveisgivenforconsistencywithlayer2butnotusedinthelayer1interfacestatusproceduresbecausetheproceduresaredefinedforpermanentlayer1activation.NOTE4:Thisprimitiveistorequestaloopbackreleasewithinthenetworkside,whichwasinvokedbyanMPH-LxACTIVATE,refertoETS300233[9].5.5Framestructure5.5.1NumberofbitspertimeslotAtimeslotshallconsistofeightbits,numberedfrom1to8.5.5.2NumberoftimeslotsperframeAframeshallconsistofthirty-twotimeslots,numberedfrom0to31.Thenumberofbitsperframeis256andtheframerepetitionrateis8000frames/s.SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)165.5.3Assignmentsofbitsintimeslot0Bits1to8oftheframe(timeslot0)shallbeasshowntable3.Table3:Allocationofbits1to8oftheframeBitnumberAlternateframes12345678FramecontainingtheSi0011011framealignmentsignalFramealignmentsignalFramenotcontainingtheSi1ASa4Sa5Sa6Sa7Sa8framealignmentsignal(seenote1)(seenote2)(seenote3)(seenote4)NOTE1:SibitsareusedforCRC-4multiframe.NOTE2:ThisbitisfixedatONEtoassistinavoidingsimulationsoftheframealignmentsignal.NOTE3:A=RAI.Inundisturbedoperation,settoZERO;inalarmcondition(RAI),settoONE.NOTE4:BitsSa4toSa8shallbesettoONEbyTEs.Sa4andSa8arereservedforinternationalstandardizationSa5toSa7arereservedfornationaluse.TEsshallignoreanyreceivedpattern.5.5.4DescriptionoftheCRC-4procedureinbit1oftheframe5.5.4.1Allocationofbit1to8oftheframeforacompletemultiframeTheallocationofbits1to8oftheframeisshownintable4foracompleteCRC-4multiframe.Table4:CRC-4multiframestructureSub-multiframeFrameBits1to8oftheframe(SMF)number123456780C10011011101ASa4Sa5Sa6Sa47Sa82C200110111301ASa4Sa5Sa6Sa47Sa84C30011011511ASa4Sa5Sa6Sa47Sa86C40011011Multi-701ASa4Sa5Sa6Sa47Sa8frame8C10011011911ASa4Sa5Sa6Sa47Sa810C2001101121111ASa4Sa5Sa6Sa47Sa812C3001101113E1ASa4Sa5Sa6Sa47Sa814C4001101115E1ASa4Sa5Sa6Sa47Sa8NOTE1:E=CRC-4errorindicationbits(seesubclause5.5.4.3).SMF(block)witherror:E=ZERO,SMF(block)withouterror:E=ONE.NOTE2:Sa4toSa8=Sparebits(seenote4totable3).NOTE3:C1toC4=CRC-4bits(seesubclause5.5.5).NOTE4:A=RAI(seetable3).5.5.4.2Sub-Multiframe(SMF)EachCRC-4multiframe,whichiscomposedof16framesnumbered0to15,isdividedintotwo8-framesub-multiframes,designatedSMF1andSMF2,whichsignifiestheirrespectiveorderofoccurrencewithintheCRC-4multiframestructure.TheSMFistheCRC-4blocksize(i.e.2048bits).SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)175.5.4.3Useofbit1in2048kbit/sCRC-4multiframeInthoseframescontainingtheframealignmentsignal(definedinsubclause5.5.3)bit1isusedtotransmittheCRC-4bits.TherearefourCRC-4bits,designatedC1,C2,C3,andC4ineachSMF.Inthoseframesnotcontainingtheframealignmentsignal(seesubclause5.5.3),bit1isusedtotransmitthe6-bitCRC-4multiframealignmentsignalandtwoCRC-4errorindicationbits(E).TheCRCmultiframealignmentsignalhastheform"001011".TheEbitsshallbeusedtoindicatereceivederroredsub-multiframesbysettingthebinarystateofoneEbitfromONEtoZEROforeacherroredsub-multiframe.Anydelaybetweenthedetectionofanerroredsub-multiframeandthesettingoftheEbitthatindicatestheerrorstateshallbelessthan1second.TheEbitsshallalwaysbetakenintoaccounteveniftheSMF,whichcontainsthem,isfoundtobeerrored,sincethereislittlelikelihoodthattheEbitsthemselveswillbeerrored.5.5.5CyclicRedundancyCheck(CRC)5.5.5.1Multiplication/divisionprocessAparticularCRC-4word,locatedinsub-multiframeN,istheremainderaftermultiplicationbyx4andthendivision(modulo2)bythegeneratorpolynomialx4+x+1,ofthepolynomialrepresentationofsub-multiframeN-1.Whenrepresentingthecontentsofthecheckblockasapolynomial,thefirstbitintheblock,i.e.frame0,bit1orframe8,bit1,shallbetakenasbeingthemostsignificantbit.Similarly,C1isdefinedtobethemostsignificantbitoftheremainderandC4theleastsignificantbitoftheremainder.5.5.5.2Encodingprocedurea)theCRC-4bitsintheSMFarereplacedbyZEROs;b)theSMFisthenacteduponbythemultiplication/divisionprocessreferredtoinsubclause5.5.5.1;c)theremainderresultingfromthemultiplication/divisionprocessisstored,readyforinsertionintotherespectiveCRC-4locationsofthenextSMF.NOTE:TheCRC-4bitsthusgenerateddonotaffecttheresultofthemultiplication/divisionprocessinthenextSMFbecause,asindicatedina),theCRC-4bitpositionsinanSMFareinitiallysettoZEROduringthemultiplication/divisionprocess.5.5.5.3Decodingprocedurea)areceivedSMFisacteduponbythemultiplication/divisionprocessreferredtoinsubclause5.5.5.1,afterhavingitsCRC-4bitsextractedandreplacedbyZEROs;b)theremainderresultingfromthisdivisionprocessisthenstoredandsubsequentlycomparedonabit-by-bitbasiswiththeCRCbitsreceivedinthenextSMF;c)iftheremaindercalculatedinthedecoderexactlycorrespondstotheCRC-4bitsreceivedinthenextSMF,itisassumedthatthecheckedSMFiserrorfree.5.6BitsequenceindependenceInterfaceIBshallprovidebitsequenceindependenttransmissionintimeslots1to31.5.7LinecodeThelinecodeshallbeHigh-DensityBipolar3(HDB3).SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)185.8TimingconsiderationsTheNTshallderiveitstimingfromthenetworkclock.TheTEshallsynchronizeitstiming(bit,octet,framing)fromthesignalreceivedfromtheNTandshallsynchronizeaccordinglythetransmittedsignal.Inanunsynchronizedcondition(e.g.whentheaccessthatnormallyprovidesnetworktimingisunavailable)thefrequencydeviationofthefree-runningclockshallnotexceed±50ppm.AnyTE,whichprovidesmorethanoneinterface,isdeclaredtobeamultipleaccessTEandshallbecapableoftakingthesynchronizingclockfrequencyforitsinternalclockgeneratorfrommorethanoneaccess(orallaccesslinks)andsynchronizethetransmittedsignalsateachinterfaceaccordingly.ATE(PTNX),whichisdesignedtoactasasynchronizationmasterinaprivatenetworkapplication,shallhaveaclockaccuracybetterthan±32ppm.APrivateTelecommunicationsNetworkExchange(PTNX)withahighclockaccuracyclassofbetterthan±1ppmmaynotbeabletosynchronizeitsinternalclocktoaninputfrequencywithatoleranceof±32ppm.ThetimingnegotiationfunctionbeingspecifiedforprivatenetworksshallguaranteethatthePTNXwiththehigherclockaccuracyshallactasthemasterafterre-establishmentoftheconfiguration.ATE,whichisdesignedtobeconnectedtotheTreferencepointonlyoraTEwithafreerunningclockaccuracybetterthan±1ppm,shallbeabletosynchronizeatthenominalbitrate±1ppm.OtherTEsshallbeabletosynchronizeatthenominalbitrate±32ppm.Inordertolimittheimpactontheserviceperformancefollowingthelossofsynchronization,themaximumtimeforresynchronizationtothenetworkclockshallbelessthan30s,withthefrequencydeviationappliedtotheinputportlimitedto±1ppm.6Interfaceprocedure6.1DefinitionofsignalsattheinterfaceSignalsexchangedbetweenthenetworkandusersideundernormalandfaultconditionsarelistedintable5.Furtherinformationonthesesignalsisgiveninsubclause7.1.Thedetectionalgorithmforsignalsgivenintable5andothersisdefinedasfollows:-normaloperationalframes:thealgorithmshallbeinaccordancewithsubclauses6.8.1.2and6.8.2;-lossofframealignment:thealgorithmshallbeinaccordancewithsubclause6.8.1.1;-RAI:thisisdetectedwhenbothofthetwofollowingconditionsoccur:-framealignmentcondition;-receptionofonebitAsettoONE.-LossOfSignal(LOS):theequipmentshallassumelossofsignalwhentheincomingsignalamplitudeismorethan20dBbelowthenominaloutputamplitudeforthisinterfaceformorethan1ms;NOTE:Thedetectionofthiseventisnecessaryifanimplementationcannotdetectlossofframealignmentincaseoflossofincomingsignal.-AlarmIndicationSignal(AIS):thisisdetectedwhenbothofthetwofollowingconditionsoccur:-lossofframealignment;-receptionof512bitperiodscontaininglessthan3ZEROs(referenceismadetoITU-TRecommendationO.162[5],paragraph3.3.2).SIST EN 300 011-1 V1.2.2:2003
ETSIETSIEN300011-1V1.2.2(2000-05)19-CRCerrorinformation:receptionofoneEbitsettoZEROaccordingtotable5;-RAIandcontinuousCRCerrorinformation:thiseventisidentifiedwhenAbitsettoONEandEbitsettoZEROarecontinuouslyreceivedwithinapersistencechecktimeperiodofbetween10msand50ms;-nosignal:itistobeunderstoodthatthetermnosignalcharacterizesarangeoftransmittedsignallevelswhichdonotnecessarilyhaveazeropulseamplitudebutmaybeinterpretedbyareceiveraslossofsignal;-lossofpowerorreturnofpower:theseareequipmentinternaleventsanddonotrequirefurtherdefinitionofthedetectionmechanism.Table5:SignalsbetweenthenetworkandusersideundernormalandfaultconditionsNameListofthesignalsNormaloperationalframeOperationalframeswith:-ActiveassociatedCRCbits;-CRCerrorinformation(seesubclause5.5.4.3);-nodefectindication.RAIOperationalframewith:-ActiveassociatedCRCbits;-CRCerrorinformation(seenote);-withremotealarmindication,(seetable3).LOSNoreceivingincomingsignalAISContinuousstreamofONEs(ITU-TRecommendationM.20[6])CRCerrorinformationEbitaccordingtosubclausetable4,setto"ZERO"ifCRCblockisreceivedwitherror.NOTE:ContiguousCRCblockswitherrorsshallresultincontiguousCRCerrorinformation.6.2DefinitionsofstatetablesatnetworkandusersidesTheusersideandnetworksideoftheinterfacehavetoinformeachotheronthelayer1statesinrelationtothedifferentde
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