ETSI EN 301 437 V1.1.1 (1999-06)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.671VTerminal Equipment (TE); Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE supporting the voice telephony service in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling33.040.35Telefonska omrežjaTelephone networksICS:Ta slovenski standard je istoveten z:EN 301 437 Version 1.1.1SIST EN 301 437 V1.1.1:2004en01-oktober-2004SIST EN 301 437 V1.1.1:2004SLOVENSKI
STANDARD
EN 301 437 V1.1.1 (1999-06)Candidate Harmonized European Standard (Telecommunications series)Terminal Equipment (TE);Attachment requirements for pan-Europeanapproval for connection to the analoguePublic Switched Telephone Networks (PSTNs)of TE supporting the voice telephony service in whichnetwork addressing, if provided, is by means ofDual Tone Multi Frequency (DTMF) signallingSIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)2ReferenceDEN/ATA-005070 (db000ico.PDF)KeywordsDTMF, PSTN, voice, regulation, terminalETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frIndividual copies of this ETSI deliverablecan be downloaded fromhttp://www.etsi.orgIf you find errors in the present document, send yourcomment to: editor@etsi.frCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1999.All rights reserved.SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)3ContentsIntellectual Property Rights.6Foreword.6Introduction.61Scope.82References.93Definitions and abbreviations.103.1Definitions.103.1.1General terms.103.1.2States.103.2Abbreviations.104Requirements.104.1General requirement.104.2Physical characteristics of the connection to the PSTN.104.3Requirements in all conditions.114.3.1Polarity.114.4General requirements in quiescent state.114.4.1DC resistance.114.4.2Characteristics of TE for ringing signals.114.4.2.1Impedance.114.4.2.2Transient response.114.4.2.3DC current.114.4.3Impedance unbalance about earth.114.4.4Resistance to earth.114.5Ringing signal detector sensitivity.124.6Transition from quiescent to loop state.124.6.1Acceptance of breaks in the loop in a call attempt.124.6.2Loop current characteristics.124.7General loop steady state requirements.124.7.1DC characteristics.134.7.2Impedance.134.7.3Sending level limitations.134.7.3.1Mean sending levels.134.7.3.2Instantaneous voltage.134.7.3.3Voltage level in a 10 Hz bandwidth.134.7.3.4Sending levels above 4,3 kHz.144.7.4Impedance unbalance about earth.144.7.4.1Longitudinal Conversion Loss.144.7.4.2Output Signal Balance.144.7.5Resistance to earth.144.8Call attempt.144.8.1Automatic dialling.144.8.1.1Dialling without dial tone detection.154.8.1.2Dialling with dial tone detection.154.8.2DTMF signalling.154.8.2.1Frequency combinations.154.8.2.2Signalling levels.154.8.2.2.1Absolute levels.154.8.2.2.2Level difference.154.8.2.3Unwanted frequency components.154.8.2.4Tone duration.164.8.2.5Pause duration.164.8.3Automatically repeated call attempts.16SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)44.9Transition from loop to quiescent state.164.10Safety.164.11EMC.16Annex A (normative):Test methods.17A.1General.17A.1.1Acoustic environment for tests.17A.2Test impedances and feeding bridge.17A.3Details for testing voice stimulated TE.17A.3.1Voice signal to be used during tests.17A.3.1.1Type.17A.3.1.2Levels.18A.3.2Electro-acoustic interfaces.19A.3.2.1Handset.19A.3.2.2Hands-free.19A.3.2.3Headset.19A.3.2.4Other interfaces.19A.3.3Electrical interfaces simulations.19A.3.3.1Analogue 2-wire NTP (Network Termination Point).19A.3.3.2Analogue 2-wire TCP (TCP of TE behind TCE).19A.3.3.3Other harmonized interfaces.19A.3.3.4Non harmonized interfaces.19A.4Test methods.19A.4.1General requirement.20A.4.2Physical characteristics of the connection to the PSTN.20A.4.3Requirements in all conditions.20A.4.3.1Polarity.20A.4.4General requirements in quiescent state.20A.4.4.1DC resistance.20A.4.4.2Characteristics of TE for ringing signals.20A.4.4.2.1Impedance.20A.4.4.2.2Transient response.20A.4.4.2.3DC current.20A.4.4.3Impedance unbalance about earth.20A.4.4.4Resistance to earth.20A.4.5Ringing signal detector sensitivity.20A.4.6Transition from quiescent to loop state.21A.4.6.1Acceptance of breaks in the loop in a call attempt.21A.4.6.2Loop current characteristics.21A.4.7General loop steady state requirements.21A.4.7.1DC characteristics.21A.4.7.2Impedance.21A.4.7.3Sending level limitations.21A.4.7.3.1Mean sending levels.21A.4.7.3.2Instantaneous voltage.22A.4.7.3.3Voltage level in a 10 Hz bandwidth.22A.4.7.3.4Sending levels above 4,3 kHz.22A.4.7.4Impedance unbalance about earth.22A.4.7.4.1Longitudinal Conversion Loss.22A.4.7.4.2Output Signal Balance.22A.4.7.5Resistance to earth.22A.4.8Call attempt.22A.4.8.1Automatic dialling.22A.4.8.1.1Dialling without dial tone detection.22A.4.8.1.2Dialling with dial tone detection.22A.4.8.2DTMF signalling.23A.4.8.2.1Frequency combinations.23A.4.8.2.2Signalling levels.23SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)5A.4.8.2.2.1Absolute levels.23A.4.8.2.2.2Level difference.23A.4.8.2.3Unwanted frequency components.23A.4.8.2.4Tone duration.24A.4.8.2.5Pause duration.24A.4.8.3Automatically repeated call attempts.24A.4.9Transition from loop to quiescent state.24Annex B (normative):Requirements Table (RT).25B.1Guidance for completion of the RT.25B.1.1Condition table.25B.1.2Requirements table.25Annex C (informative):Reasons for omitting 10 Hz signal limitations.28Bibliography.29History.30SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)6Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI Web server (http://www.etsi.org/ipr).Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Project Analogue Terminals andAccess (ATA).The present document has been produced by ETSI in response to a mandate from the European Commission issuedunder Council Directive 98/34/EC (as amended) laying down a procedure for the provision of information in the field oftechnical standards and regulations.The present document is intended to become a Harmonized Standard as requested by the above mentioned mandate, thereference of which will be published in the Official Journal of the European Communities referencing the CouncilDirective relating to telecommunications terminal equipment and satellite earth station equipment, including the mutualrecognition of their conformity (Directive 98/13/EC [12]).A common technical regulation may be established by the European Commission in accordance with the Directive.Technical specifications relevant to the 98/13/EC Directive [12] are given in the Requirements Table (RT) in annex B.National transposition datesDate of adoption of this EN:28 May 1999Date of latest announcement of this EN (doa):31 August 1999Date of latest publication of new National Standardor endorsement of this EN (dop/e):30 November 1999Date of withdrawal of any conflicting National Standard (dow):31 May 2000IntroductionThe existing analogue presentation of Public Switched Telephone Networks (PSTNs) in European countries aretechnically somewhat different, due to historical reasons. The services being offered to the end users also differ to acertain extent.Terminal equipment is undergoing constant and rapid development, and it is therefore imperative that the delay in, andcost of, market introduction caused by the approval procedures is the minimum possible. Otherwise, new innovativeproducts may be available to Europe at later dates than to other regions in the world. Also, countries in Europe wherethe market is comparatively small may never benefit from these products, if the cost of market introduction is too high.SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)7According to directive 98/13/EC [12], a Terminal Equipment (TE) is required, among other things, to:-not cause harm to the network - Article 5(d);-be able to inter-work with the network in order to set up, hold, modify, charge for and clear down a connection -Article 5(f);-inter-work via the public telecommunications network, in justified cases - Article 5(g).Although different, the networks have some basic commonalities. By restricting the requirements to cover only the inter-working that is essential for the establishment of a call to/from a terminal the signalling aspects can be simplified andharmonized.The present document specifies a harmonized set of requirements which will allow terminals that are capable ofsupporting any voice telephony service, to be analogue connected to the existing European PSTNs. It covers all relevantessential requirements in directive 98/13/EC [12]. All safety requirements are covered by the LVD and therefore thereare no requirements for Articles 5(a) and 5(b). All EMC requirements are covered by the EMC directive and thereforeno requirements for Articles 5(c) are included in the present document. Article 5(e) is not applicable for a non-radiosystem. Article 5(g) is only applicable for voice terminals that support the voice telephony justified case service.The present document specifies the connection arrangements (plug or socket, at the supplier's choice) to be provided bythe terminal equipment. An adapter may be required between the terminal and the existing national network terminationpoint in individual countries. Such an adapter is outside the scope of the present document.The pan-European approval requirements for TE access to an analogue presented PSTN are related to the network'scapabilities. A single terminal may consume all of this (given) capability, or it can be shared by a number of terminalsall being connected to the NTP in an arbitrary combination of parallel and/or series connection in which case theperformance of each individual terminal will need to be better than required by the present document to ensuresatisfactory inter-working with the network. Connection of terminal equipment in series and/or parallel is a nationalmatter, but guidance may be found in EG 201 120 [1].NOTE:On certain networks, some lines are unable to provide a line current as high as 18 mA. Where for thepurpose of the present document, a TE that has been declared by the manufacturer to be for use only onlines providing a loop current greater than 18 mA, the supplier should convey this limitation in its use tothe end user, but the way in which this is expressed is left to the manufacturer.SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)81ScopeThe present document specifies the technical characteristics (electrical and mechanical interface requirements andaccess control protocol) under Articles 5(d) and 5(f) of Directive 98/13/EC [12] to be provided by a single terminalequipment which is intended:a)for pan-European approval;b)for connection by 2-wires to an analogue interface of a PSTN. This interface is characterized by DC loop seizureand clearing, uses low frequency AC ringing signals below the speech pass-band to indicate an incoming call andin the transmission phase has an approximate bandwidth of 3 kHz at the network termination point; andc)for supporting any voice telephony service.The objective of the present document is to ensure that no harm occurs to the public network, and to ensure inter-working between the network and a single terminal so that calls can be routed successfully through the network.The present document applies to terminal equipment that is intended to originate and/or receive calls. Where it isintended to originate calls the present document specifies the requirements for DTMF signalling. If other signallingmethods are provided, in addition to DTMF, these other signalling methods, if they are intended to be used in certainEuropean countries, may be subject to additional national regulations.A test is given for each requirement in the present document including measurement methods. The terminal equipmentmay be stimulated to perform the tests by additional equipment if necessary.The present document specifies the connection arrangements (plug or socket, at the suppliers choice) to be provided bythe terminal equipment. An adapter may be required between the terminal and the existing national network terminationpoint in individual countries. Such an adapter is outside the scope of the present document.Where the origination or reception of calls by the terminal equipment is invoked, or otherwise controlled, by otherequipment external to the terminal equipment, the terminal equipment still needs to be capable of fulfilling the essentialrequirements under Articles 5(d) and 5(f) at the interface to the public network. The present document requires themanufacturer or supplier of the terminal equipment to declare the conditions met by such external devices so that theiruse does not cause the terminal equipment to fail to meet the essential requirements.NOTE 1:Terminal to terminal inter-operability for handset telephony is addressed in TBR 38 [9].NOTE 2:Facilities for Supplementary signalling (e.g. reception of metering pulses from the network) if provided inthe terminal, and intended to be used in certain European countries, may be subject to the appropriateNational Regulations.NOTE 3:The Electromagnetic Compatibility (EMC) and safety requirements fall beyond the scope of the presentdocument. These requirements are covered by Directives 89/336/EEC [11] (EMC) and 73/23/EEC [10](Safety).SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)92ReferencesThe following documents contain provisions which, through reference in this text, constitute provisions of the presentdocument.· References are either specific (identified by date of publication, edition number, version number, etc.) ornon-specific.· For a specific reference, subsequent revisions do not apply.· For a non-specific reference, subsequent revisions do apply.· A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]EG 201 120: "Public Switched Telephone Network (PSTN); Method of rating terminal equipmentso that it can be connected in series and/or in parallel to a Network Termination Point (NTP)".[2]ITU-T Recommendation P.38: "Transmission characteristics of operator telephone systems(OTS)".[3]ITU-T Recommendation P.51: "Artificial mouth".[4]ITU-T Recommendation P.64: "Determination of sensitivity/frequency characteristics of localtelephone systems".[5]ITU-T Recommendation P.59: "Artificial conversational speech".[6]ITU-T Recommendation P.340: "Transmission characteristics of hands-free telephones".[7]TBR 10: "Digital Enhanced Cordless Telecommunications (DECT); General terminal attachmentrequirements: Telephony applications".[8]TBR 21: "Terminal Equipment (TE); Attachment requirements for pan-European approval forconnection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TEsupporting the voice telephony service) in which network addressing, if provided, is by means ofDual Tone Multi Frequency (DTMF) signalling".[9]TBR 38: "Public Switched Telephone Network (PSTN); Attachment requirements for a terminalequipment incorporating an analogue handset function capable of supporting the justified caseservice when connected to the analogue interface of the PSTN in Europe".[10]73/23/EEC: "Council Directive of 19 February 1973 on the harmonization of the laws of theMember States relating to electrical equipment designed for use within certain voltage limits".[11]89/336/EEC: "Council Directive of 3 May 1989 on the approximation of the laws of the MemberStates relating to electromagnetic compatibility".[12]98/13/EC: "Directive of the European Parliament and of the Council of 12 February 1998 relatingto telecommunications terminal equipment and satellite earth station equipment, including themutual recognition of their conformity".[13]TR 101 149: "2-wire analogue voice band interfaces; Terminal Equipment transmitting voicesignals; Test simulation for level limitation requirements".[14]ITU-T Recommendation G.101: "The transmission plan".[15]98/34/EC: "Directive of the European Parliament and of the Council of 22 June 1998 laying downa procedure for the provision of information in the field of technical standards and regulations".SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)103Definitions and abbreviations3.1DefinitionsFor the purposes of the present document, the terms and definitions given in TBR 21 [8] and the following apply.3.1.1General termsAs defined in TBR 21 [8].3.1.2StatesAs defined in TBR 21 [8].3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply together with those in TBR 21 [8].dBdecibeldBPasound pressure level with respect to 1 Pa, expressed in dBdBVemfvoltage level (rms) with respect to 1 Vemf, expressed in dBemfelectromotive forceHFRPHands-Free Reference PointICPInstallation Connection Point, see EG 201 120 [1]ITUInternational Telecommunication UnionMRPMouth Reference PointPaPascalTCEThrough Connected EquipmentTBRTechnical Basis for Regulation4RequirementsRequirement: The requirement of clause 4 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to be capable of sending signalsto and/or receiving signals from the PSTN.4.1General requirementRequirement and test: The requirement and the associated test of subclause 4.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Articles 5(d) and 5(f). Where the origination or reception of calls by the TE is invoked, orotherwise controlled by other equipment external to the TE, the TE should still be capable of fulfilling the essentialrequirements of the directive at the interface to the public network.4.2Physical characteristics of the connection to the PSTNRequirement and test: The requirement and the associated test of subclause 4.2 of TBR 21 [8] shall apply. In the caseof multiline equipment the TCP may be presented to the NTP using other methods of connection.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires a TE to be galvanically connected tothe two wires presented by the network at the NTP. To facilitate the use of adapters, the TE requires a known type ofconnection arrangement.SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)114.3Requirements in all conditions4.3.1PolarityRequirement and test: The requirement and the associated test of subclause 4.3.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to operate with both polarities,since a fixed polarity cannot be guaranteed.4.4General requirements in quiescent state4.4.1DC resistanceRequirement and test: The requirement and the associated test of subclause 4.4.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to present a sufficiently highDC resistance in quiescent state so as not to disturb the basic call control and to prevent the malfunction of network callcontrol equipment.4.4.2Characteristics of TE for ringing signals4.4.2.1ImpedanceRequirement and test: The requirement and the associated test of subclause 4.4.2.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Interworking with the PSTN requires the TE to present an impedance toringing signals that is sufficiently high.4.4.2.2Transient responseRequirement and test: The requirement and the associated test of subclause 4.4.2.2 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the current transient to be limited at thebeginning of a ringing signal.4.4.2.3DC currentRequirement and test: The requirement and the associated test of subclause 4.4.2.3 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to avoid creating DC currentdue to asymmetric load of the ringing signal (e.g. caused by the use of over-voltage arrestors). This requirement avoidsfalse seizure of the PSTN.4.4.3Impedance unbalance about earthRequirement and test: The requirement and the associated test of subclause 4.4.3 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(d); Protection of the PSTN from harm requires the TE to present a sufficientlyhigh unbalance loss not to produce levels of cross-talk that disturb the service of other users of the PSTN connected toother pairs in the same cable.4.4.4Resistance to earthRequirement and test: The requirement and the associated test of subclause 4.4.4 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to present a sufficiently highDC resistance to earth in the quiescent state to prevent the malfunction of network call control equipment.SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)124.5Ringing signal detector sensitivityRequirement and test: The requirement and the associated test of subclause 4.5 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to be capable of detecting orindicating to the user that valid ringing signals are being received.4.6Transition from quiescent to loop state4.6.1Acceptance of breaks in the loop in a call attemptRequirement and test: The requirement and the associated test of subclause 4.6.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to be capable of acceptingbreaks in the loop current during establishment of loop state.4.6.2Loop current characteristicsRequirement and test: The requirement and the associated test of subclause 4.6.2 of TBR 21 [8] shall apply, excepttable 4. Table 4 of TBR 21 [8] shall be replaced by the table 1 of the present subclause. The test method descriptionshall be adapted accordingly.The entry in table 1 with Rf = 2 300 W is only applicable for TE, which has been declared by the manufacturer for useonly on lines providing a loop current of 18 mA or greater, which then is a replacement for the table entry withRf = 2 800 W.Table 1: TE current characteristics with feeding resistorswhich are used during the loop steady stateConditionRequirementsFeedingvoltageFeedingresistanceTime (ms)Current (mA)VfRft1-t0t2-t01t3-t01If1If250 V DC2,8 kW305001 20015,014,650 V DC2,3 kW305001 20018,217,850 V DC230 W205001 20049,649,6Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to be capable of seizing theline.4.7General loop steady state requirementsThe requirements during the loop steady state apply when the TE has been in the loop state for a minimum of 1,2 s witha line feeding current which can be obtained when the TE is connected to a source of 50 V DC in series with a resistorwithin the range of:a)2 300 W to 230 W for TE declared to be intended for use only on lines providing a loop current of 18 mA orgreater;b)2 800 W to 230 W for TE not declared to be intended for use only on lines providing a loop current of 18 mA orgreater.For the purpose of conducting the test of subclauses A.4.7.1, A.4.7.2, A.4.7.3.4.1, A.4.7.3.4.2 A.4.7.4.1 and A.4.7.4.2 ofTBR 21 [8], the maximum feed resistance of 3 200 W shall be replaced by: 2 300 W for case a) or 2 800 W for case b).SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)134.7.1DC characteristicsRequirement and test: The requirement and the associated test of subclause 4.7.1 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); European PSTN have differing DC characteristics. Inter-working with thePSTN requires the TE to present a sufficiently low DC resistance in loop state.4.7.2ImpedanceRequirement and test: The requirement and the associated test of subclause 4.7.2 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to present an impedance whichpermits proper functioning of call control and the maintenance of stability in the PSTN.4.7.3Sending level limitations4.7.3.1Mean sending levelsRequirement: When stimulated by a Pseudo Speech Signal at a level defined in subclause A.3.1.2, table A.1, column"Nominal", the mean sending level in the frequency range 200 Hz to 3 800 Hz over a one-minute period shall not begreater than -9,7 dBV when the TE interface is terminated with the reference impedance ZR. This requirement does notapply to DTMF signals. TE in the scope of, and meeting the requirements of either, TBR 38 [9], or TBR 10 [7] shall bedeemed to be compliant with the requirements of this subclause.Justification: 98/13/EC [12], Article 5(d); Protection of the PSTN from harm requires the signal sent into the PSTN bythe TE to be limited so that the interfering effects of the signal can be predicted and avoided.NOTE:This requirement is not identical to the requirement in the corresponding clause in TBR 21 [8], butprovides statistically for a mean sending level to line equivalent to that stated in TBR 21 [8].Test: The test shall be conducted according to annex A, subclause A.4.7.3.1.4.7.3.2Instantaneous voltageRequirement and test: The requirement and the associated test of subclause 4.7.3.2 of TBR 21 [8] shall apply. For thepurpose of this test, the "representative output" referred to in the associated test of that subclause shall be the outputresulting when the TE is stimulated by a pseudo speech signal at a level defined in subclause A.3.1.2, table A.1, column"5 Vpp" of the present document.NOTE:It is recognised that due to the statistical nature of speech signals, the peak to peak voltage level couldunder some circumstances of real use exceed 5 V. It is recommended that when stimulated with thepseudo speech signal at a level of +10 dBPa, the peak to peak voltage measured in the frequency band100 Hz to 20 kHz should not exceed 8,0 V when the TE interface is terminated with the referenceimpedance ZR.Justification: 98/13/EC [12], Article 5(d); Protection of the PSTN from harm requires the signal sent into the PSTN bythe TE to be limited so that the interfering effects of the signal can be predicted and avoided.4.7.3.3Voltage level in a 10 Hz bandwidthRequirement: None.NOTE:For the reasons given in annex C of the present document, voice stimulated TEs meetingsubclauses 4.7.3.1 and 4.7.3.2 comply with the requirements for the voltage level in a 10 Hz bandwidth asgiven in the corresponding clause of TBR 21 [8].SIST EN 301 437 V1.1.1:2004

ETSIETSI EN 301 437 V1.1.1 (1999-06)144.7.3.4Sending levels above 4,3 kHzRequirement and test: The requirement and the associated test of subclause 4.7.3.4 of TBR 21 [8] shall apply when theTE is stimulated by a Pseudo Speech Signal at a level defined in subclause A.3.1.2, table A.1, column "Nominal".Justification: 98/13/EC [12], Article 5(d); Protection of the PSTN from harm requires the signal sent into the PSTN bythe TE to be limited so that the interfering effects of the signal can be predicted and avoided.4.7.4Impedance unbalance about earthJustification: 98/13/EC [12], Article 5(d); Protection of the PSTN from harm requires the TE to present a sufficientlyhigh unbalance loss not to produce levels of cross-talk that disturb the service of other users of the PSTN connected toother pairs in the same cable.4.7.4.1Longitudinal Conversion LossRequirement and test: The requirement and the associated test of subclause 4.7.4.1 of TBR 21 [8] shall apply.4.7.4.2Output Signal BalanceRequirement and test: The requirement and the associated test of subclause 4.7.4.2 of TBR 21 [8] shall apply when theTE is stimulated by a Pseudo Speech Signal at a level defined in subclause A.3.1.2, table A.1, column "Nominal".4.7.5Resistance to earthRequirement and test: The requirement and the associated test of subclause 4.7.5 of TBR 21 [8] shall apply.Justification: 98/13/EC [12], Article 5(f); Inter-working with the PSTN requires the TE to present a sufficiently highDC resistance to earth in loop states so as not to disturb the basic call control function.4.8Call attemptThe requirements of subclause 4.7 shall also apply during a call attempt.The requirements during the loop steady state apply when the TE has been in the loop state for a minimum of 1,2 s witha line feeding current which can be obtained when the TE is connected to a source of 50 V DC in series with a resistorwithin the range of:a)2 300 W to 230 W for TE declared to be intended for use only on lines providing a loop current of 18 mA orgreater;b)2 800 W to 230 W for TE not decla
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