ETSI ETS 300 297 ed.1 (1995-05)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalno omrežje z integriranimi storitvami (ISDN)
– Digitalni dostopovni odsek za osnovni dostop v sistemu ISDNIntegrated Services Digital Network (ISDN); Access digital section for ISDN basic access33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 297 Edition 1SIST ETS 300 297 E1:2003en01-december-2003SIST ETS 300 297 E1:2003SLOVENSKI
STANDARD



SIST ETS 300 297 E1:2003



EUROPEANETS 300 297TELECOMMUNICATIONMay 1995STANDARDSource: ETSI TC-TMReference: DE/TM-03004ICS:33.080Key words:ISDN, basic accessIntegrated Services Digital Network (ISDN);Access digital section for ISDN basic accessETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 92 94 42 00 - Fax: +33 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1995. All rights reserved.SIST ETS 300 297 E1:2003



Page 2ETS 300 297: May 1995Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 297 E1:2003



Page 3ETS 300 297: May 1995ContentsForeword.71Scope.92Normative references.93Definitions and abbreviations.103.1Definitions.103.2Abbreviations.104Configuration and application.104.1Configuration.104.2Application.114.3Modelling and relationship between the access digital section and the ET.135Functions.145.1B-channel.145.2D-channel.145.3Bit timing.145.4Octet timing.145.5Activation.155.5.1Activation from ET.155.5.2Request for activation from TE.155.6Deactivation.155.7Power feeding.155.8Operation and maintenance.156Signal transfer delay.157Jitter.167.1Output/input jitter at the T reference point.167.2Jitter at V1 reference point.168Activation/deactivation.168.1Functional capabilities.168.1.1Customer installation at the user side of the T reference point.168.1.2Installation at the network side of V1 reference point.168.2Modelling.178.2.1General.178.2.2Partitioning of functions.188.2.3Location of timer T2.188.3Activation/deactivation procedures.198.3.1Basic characteristics of the procedures.198.3.1.1Priority.198.3.1.2System management.198.3.1.3Loopbacks.198.3.1.4Protection of layer 2 frames.198.3.1.5Structure of the tables.198.4Description of the state transition table.208.4.1Access digital section states (DS-states).208.4.1.1State DS 1.0 (access deactivated).208.4.1.2State DS 1.1 (access activation initiated).208.4.1.3State DS 1.2 (access activation: DS synchronised LT -->NT).208.4.1.4State DS 1.3 (access activation: DS activated).208.4.1.5State DS 1.4 (access activated).20SIST ETS 300 297 E1:2003



Page 4ETS 300 297: May 19958.4.1.6State DS 1.5 (LOS/LFA at T).208.4.1.7State DS 1.6 (access deactivation initiated).218.4.1.8State DS 1.7 (defect condition).218.4.1.9State DS 2.0 (loopback 1 or 1a initiated).218.4.1.10State DS 2.1 (loopback 1 or 1a activated).218.4.1.11State DS 2.2 (loopback 2 initiated).218.4.1.12State DS 2.3 (DS synchronised LT --> NT).218.4.1.13State DS 2.4 (DS activated).218.4.1.14State DS 2.5 (loopback 2 activated).218.4.2Set of signals sent across the T reference point.218.4.3Set of function elements sent across the V1 reference point.228.4.4Assumptions made in specifying the procedures in table 2.228.5Activation time.258.5.1Warm start time.258.5.2Cold start time.259Operation and maintenance.259.1Control facilities.259.1.1Loopbacks.259.1.1.1Loopback implementation.259.1.1.2Loopback procedure.269.1.2Information request.269.1.3Power switch on/off to the line.269.1.4Continuity test.269.2Monitoring.269.2.1Functions.269.2.2Defect conditions and consequent actions.269.2.2.1Detection of defect conditions.269.2.2.2Consequent actions.279.2.3Error detection and reporting.279.2.4Status report functions.279.2.5System dependent status report functions.27Annex A (normative):System management requirements.28A.1Introduction.28A.2System management requirements.28A.2.1General.28A.2.2Error indications.28A.2.3Loopback operations.28A.2.4Continuity test.28A.2.5Information to be sent in the D-channel during loopback operation.28A.2.6Configuration control.29A.3Description of the ET layer 1 state transition table.29A.3.1ET layer 1 states (ET-states).29A.3.1.1State ET 1.0 (access deactivated).29A.3.1.2State ET 1.1 (access activation initiated).29A.3.1.3State ET 1.2 (access activated):.29A.3.1.4State ET 2.0 (access in loopback state).29A.3.1.5State ET 2.1 (loopback requested).29A.3.2Set of primitives within the ET for the support of functions associated with the accessdigital section.30A.3.3Assumptions made in specifying the procedures in table A.1 (ET 1.x states).30Annex B (informative):Partial activation of the access digital section.32B.1Introduction.32B.2Description of DS 3.x states for the partial DS activation of the access digital section mode ofoperation.32B.2.1State DS 3.0 (partial activation initiated).32SIST ETS 300 297 E1:2003



Page 5ETS 300 297: May 1995B.2.2State DS 3.1 (DS activated, T interface deactivated).32B.2.3State DS 3.2 (DS activated, T interface activating).32B.2.4State DS 3.3 (access activated).32B.2.5State DS 3.4 (LOS/LFA at T).32B.2.6State DS 3.5 (T interface deactivating).33B.3Description of ET 3.x states for the partial activation of the access digital section mode ofoperation.38B.3.1State ET 3.0 (partial activation initiated).38B.3.2State ET 3.1 (DS partially activated, interface at T deactivated).38B.3.3State ET 3.2 (DS partially activated, interface at T activation initiated).38B.3.4State ET 3.3 (DS partially activated, interface at T activated).38B.4Set of primitives within the ET for the support of functions associated with the partial activation ofthe access digital section.38Annex C (informative):Bibliography.39History.40SIST ETS 300 297 E1:2003



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Page 7ETS 300 297: May 1995ForewordThis European Telecommunication Standard (ETS) has been produced by the Transmission andMultiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).Proposed transposition datesDate of latest announcement of this ETS (doa):31 August 1995Date of latest publication of new National Standardor endorsement of this ETS (dop/e):29 February 1996Date of withdrawal of any conflicting National Standard (dow):29 February 1996SIST ETS 300 297 E1:2003



Page 8ETS 300 297: May 1995Blank pageSIST ETS 300 297 E1:2003



Page 9ETS 300 297: May 19951ScopeThis European Telecommunication Standard (ETS) specifies the characteristics of an access digitalsection for the Integrated Services Digital Network (ISDN) basic access between the user-networkinterface (at T reference point, as defined in ETS 300 012 [6] and the local exchange (at V1 referencepoint defined in CCITT Recommendation Q.512 [4]) supporting the basic access interface channelstructure (defined in CCITT Recommendation I.412 [1] and ETS 300 012 [6]) and the additional functionsrequired for operation and maintenance of the access digital section. This ETS is based on CCITTRecommendation G.960 [7].The requirements of this ETS and subsequently for the transmission systems based on this ETS, satisfynetwork performance requirements of CCITT Recommendation G.821 on error performance as well asCCITT Recommendations G.801 and I.350 with regard to availability. Annex A to this ETS is normativeand specifies requirements for working with the Exchange Termination (ET) and the definition of the ETlayer 1 state machine which are outside the scope of this ETS, but nevertheless are important for theunderstanding of the behaviour of the access digital section.Annex B specifies an optional procedure for partial activation and deactivation of the access digitalsection.Annex C provides a bibliography of informative references used in this ETS.A further annex is under development which will specify conformance testing for this ETS. This will beadded to this ETS using the ETSI standards maintenance procedures.2Normative referencesThis ETS incorporates, by dated or undated reference, provision from other publications. These normativereferences are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this ETSonly when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred applies.[1]CCITT Recommendation I.412 (1988): "ISDN user-network interfaces - Interfacestructures and access capabilities".[2]ETS 300 125 (1990): "Integrated Services Digital Network (ISDN); User-networkinterface data link layer specification; Application of CCITT RecommendationsQ.920/I.440 and Q.921/I.441".[3]ETR 001 (1990): "Integrated Services Digital Network (ISDN); Customer accessmaintenance".[4]CCITT Recommendation Q.512 (1988): "Exchange interfaces for subscriberaccess".[5]CCITT Recommendation G.114 (1988): "Mean one-way propagation time".[6]ETS 300 012 (1991): "Integrated Services Digital Network (ISDN); Basic user-network interface Layer 1 specification and test principles".[7]CCITT Recommendation G.960 (1988): "Digital section for ISDN basic rateaccess".[8]ETR 080 (1992): "Transmission and Multiplexing (TM); Integrated ServicesDigital Network (ISDN) basic rate access Digital transmission system on metalliclocal lines".[9]CCITT Recommendation I.430 (1988): "Basic user-network interface - Layer 1specification".SIST ETS 300 297 E1:2003



Page 10ETS 300 297: May 19953Definitions and abbreviations3.1DefinitionsAccess: The ISDN customer access as defined in CCITT Recommendation G.960 [7], annex B. TheAccess consists of the ET, the access digital section and the terminal equipment.full activation: Activation of the access in order to establish a layer 2 service between the user and thenetwork.partial activation: Partial activation of the access digital section under control from the ET. No signalshall be sent from the NT1 to the interface at the T reference point, but signals can be received for theactivation from the user side.TE: In this ETS, unless otherwise indicated, the term TE is used to indicate terminating layer 1 aspects ofTE1, TA and NT2 functional groups. When the term TE indicates terminating layer 1 aspects of TE1, then,according to CCITT Recommendation I.411, figure 2, the S and T reference points coincide. However, forthe purposes of this ETS, the terminology used is in accordance with annex B of CCITT RecommendationG.960 [7].3.2AbbreviationsFor the purposes of this ETS, the following abbreviations apply.AIAction IndicatorDSaccess Digital SectionETExchange TerminationFEFunction Element used between the ET and LTHDLCHigh level Data Link ControlINFOInformation element defined at the user-network interfaceISDNIntegrated Services Digital NetworkLFALoss of Frame AlignmentLOSLoss Of SignalLTLine TerminationMPHCommunication between Management and Physical layerNTNetwork TerminationPHCommunication between data link layer and Physical layerREGRegeneratorSIGSignal between LT and NT1TETerminal Equipment (see also subclause 3.1)4Configuration and application4.1ConfigurationFigure 1 shows the boundaries of the access digital section in relation to the digital system definition.NOTE 1:From a functional point of view the information transferred via the reference points Tand V1 are different and, therefore, the access digital section is not symmetrical.NOTE 2:The T and V1 reference points are defined in CCITT Recommendations I.411 andQ.512 [4].SIST ETS 300 297 E1:2003



Page 11ETS 300 297: May 1995Digital transmission systemTENT1LTETV1ReferencepointReferencepointAccess Digital SectionDSTNOTE 1:Digital transmission system refers to a line system using metallic pairs, optical fibres orradio systems.NOTE 2:The line transceivers in the Network Termination (NT) and the Line Termination (LT)are part of the digital transmission system.Figure 1: Access digital section and transmission system boundariesThe concept of the access digital section is used in order to allow a functional and procedural descriptionand a definition of the network requirements.The concept of a digital transmission system is used in order to describe the characteristics of animplementation, using a specific medium, in support of the access digital section.4.2ApplicationThe basic access digital section may be applied as given in figure 2 for:-direct access to the local exchange (V1 reference point);-access via a basic access multiplex equipment (V5 interface) to the local exchange;-access via a basic access concentrator (V5 interface) to the local exchange.NOTE:Other applications may also be possible and may be defined in the relevant standard,e.g. flexible access network. However, it is assumed that the functionality of the basicaccess section will be maintained.SIST ETS 300 297 E1:2003



Page 12ETS 300 297: May 1995 TETNT1(note 2)access digital section(note 2)access digital sectionTETETNT1NT1LTLT(note 2)access digital sectionV1MultiplexerConcentrator(note 3)V5ETETETLTLocal exchange(note 1)V1(note 3)V5TV1NOTE 1:The LT may be integrated together with the ET or separate (as integral part or outsideof the local exchange).NOTE 2:An access digital section using a digital transmission system for metallic pairs theapplication of one regenerator may be foreseen.NOTE 3:Local and remote applications are envisaged. For the remote case, a transparent linkbetween the remote multiplexer or concentrator and the local exchange shall be used.NOTE 4:Depending of the functionality implemented in the multiplexer or concentrator theremay be a part of the ET function implemented in this equipment.Figure 2: Examples of equipment configuration in the ISDN basic accessThis model includes primitive procedures between ET layer 1, ET layer 2 and system management:a)ETS 300 012 [6] and ETS 300 125 [2] interactions between ET layer 1 and ET layer 2 and systemmanagement based on PH and MPH primitives, respectively, as defined in ETS 300 012 [6]. Theseinteractions are for the support of functions specified in ETS 300 125 [2];b)interactions between ET layer 1 and system management for the support of functions associatedwith the access digital section, based on MPH primitives.The primitive procedures within TE comply with the specification according to ETS 300 012 [6].This model does not constrain layer 1 arrangements between LT and NT1, (it is also applicable to remoteaccess as shown in figure 2), or the digital transmission system technology.SIST ETS 300 297 E1:2003



Page 13ETS 300 297: May 19954.3Modelling and relationship between the access digital section and the ETPH primitivesaccording toETS 300 012PH primitivesaccording toETS 300 012B channelsMPH primitivesaccording to ETS 300 012MPH primitivesaccording to ETS 300 012INFOs(note 1)MPH primitivesassociated with line systemTSIGs (note 2)Digital transmissionsystem(note 1)TElayer 1NT1LTETlayer 1B channels(note 2)
FEs access digital sectionV1System management (note 3)TE layer 2ET layer 2System management (note 3)NOTE 1:The digital transmission system refers to a digital line transmission system using eithera metallic pair of wires, optical fibre or radio system.NOTE 2:SIG, Function Element (FE) and primitives refer to an exchange of information. Theydo not imply any specific coding nor implementation. Some of these functions may beterminated in the LT and do not pass through the digital transmission system.NOTE 3:The term system management corresponds to both system management and layermanagement as defined in CCITT Recommendation Q.940 (see also clause A.1 ofthis ETS).Figure 3: General model of ISDN customer access layer 1 and adjacent entitiesThe general model shown in figure 3 depicts the whole ISDN customer access layer 1 and adjacententities, and provides the basis to describe the functions performed by the access digital section andthose performed by TE, ET and system management and how various functions are grouped. Inparticular, according to this model, the activation/deactivation procedures and maintenance functionsspecified in this ETS are not confined to functions performed by the access digital section but includefunctions associated with ET layer 1.SIST ETS 300 297 E1:2003



Page 14ETS 300 297: May 19955FunctionsFigure 4 shows the functions which need to be supported by the basic access digital section.T reference pointAccess Digital SectionV
reference point1 B-ChannelsD-ChannelBit timingOctet timingActivation (note)Deactivation (note)Power feedingOperation andMaintenanceNOTE:The activation and deactivation functions are concerned with the operation of theaccess digital section and the user-network interface. However, for consistency withETS 300 012 [6], they are described as separate functions.Figure 4: Functions supported in the access digital section5.1B-channelThis function provides, for each direction of transmission, two independent 64 kbit/s channels for use asB-channels (as defined in CCITT Recommendation I.412 [1]).5.2D-channelThis function provides, for each direction of transmission, one D-channel at a bit rate of 16 kbit/s (asdefined in CCITT Recommendation I.412 [1]).5.3Bit timingThis function provides bit (signal element) timing to enable the receiving equipment to recover informationfrom the aggregate bit stream. For the V1 reference point, the bit timing function is used for both transmitand receive data.5.4Octet timingThis function provides 8 kHz octet timing for the B-channels.SIST ETS 300 297 E1:2003



Page 15ETS 300 297: May 19955.5Activation5.5.1Activation from ETThis function places all the functions of the access digital section into a normal operating mode andsupports the activation of the interface at the T reference point according to ETS 300 012 [6]. This takesinto account:-power down mode;-initial power up;-a failure condition.The procedures and exchange of information are described in clause 8 of this ETS.An activation should be possible to a state which allows maintenance actions to be performed in theaccess digital section even when there is no customer equipment connected to the T reference point.5.5.2Request for activation from TEThis function supports activation of the access digital section and of the interface at the T reference pointaccording to ETS 300 012 [6].5.6DeactivationThis function is specified in order to permit the interface at the T reference point and the access digitalsection or the T reference point only to be placed in a low power consumption mode. The procedures andexchange of information are described in clause 8 of this ETS.Deactivation should be initiated only by the ET.5.7Power feedingThis function provides for remote power feeding of NT1. This function is dependent on the transmissionmedium used. The power feeding through the interface at the T reference point is defined inETS 300 012 [6].5.8Operation and maintenanceThis function supports required actions and information for operating and maintaining the access digitalsection controlled by the ET as defined in ETR 001 [3].Four categories of functions have been identified:-commands regarding LT, regenerator, or NT1;-information from LT, regenerator, or NT1;-indications of fault conditions;-control of access digital section power feeding.6Signal transfer delayThe mean one-way delay between the T and V1 reference points shall not exceed 1 250 ms when noregenerator is implemented. In accordance with CCITT Recommendation G.114 [5], this value is themean of the propagation times in the two directions of transmission.SIST ETS 300 297 E1:2003



Page 16ETS 300 297: May 19957Jitter7.1Output/input jitter at the T reference pointThe requirements are specified in ETS 300 012 [6], subclause A.8.3.7.2Jitter at V1 reference pointJitter on timing signals provided at V1 reference point to the LT shall be limited to values which do notrequire jitter reduction in the LT.Jitter limits at the V1 reference point from LT are not required, because the timing at the V1 referencepoint is defined as contra-directional.Jitter requirements additional to those given in CCITT Recommendation G.960 [7], § 4.4.2 are systemdependent and outside the scope of this ETS and may be as defined in ETR 080
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