SIST ETS 300 248 E1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Business Telecommunications (BT); Open Network Provision (ONP) technical requirements; 2 048 kbit/s digital unstructured leased line (D2048U) Terminal equipment interface33.040.50Vodi, zveze in tokokrogiLines, connections and circuitsICS:Ta slovenski standard je istoveten z:ETS 300 248 Edition 1SIST ETS 300 248 E1:2004en01-oktober-2004SIST ETS 300 248 E1:2004SLOVENSKI
STANDARD



SIST ETS 300 248 E1:2004



EUROPEANETS 300 248TELECOMMUNICATIONOctober 1993STANDARDSource: ETSI TC-BTReference: DE/BT-02020ICS:33.020Key words:ONP, leased lines, 2048UBusiness Telecommunications (BT);Open Network Provision (ONP) technical requirements;2 048 kbit/s digital unstructured leased line (D2048U)Terminal equipment interfaceETSIEuropean 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 1993. All rights reserved.SIST ETS 300 248 E1:2004



Page 2ETS 300 248: October 1993Whilst 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 Standards Approval Dept." at the address shown on the title page.SIST ETS 300 248 E1:2004



Page 3ETS 300 248: October 1993ContentsForeword.5Introduction.51Scope.72Normative references.73Definitions.74Symbols and abbreviations.85Requirements.95.1Physical characteristics.95.2Electrical characteristics.95.2.1Output port.95.2.1.1Signal coding.95.2.1.2Waveform shape.105.2.1.3Clock accuracy.115.2.1.4Impedance towards ground.125.2.1.5Output jitter.125.2.1.6Output return loss.125.2.1.7Output signal balance.125.2.2Input port.125.2.2.1Signal coding.125.2.2.2Input return loss.135.2.2.3Input loss tolerance.135.2.2.4Immunity against reflections.135.2.2.5Tolerable longitudinal voltages.135.2.2.6Impedance towards ground.135.2.2.7Input jitter tolerance.145.2.2.8Input clock tolerance.145.3Safety.155.3.1General requirements.155.3.2Touch current.155.4Overvoltage protection.155.4.1Surge simulation, common mode.155.4.2Surge simulation, transverse mode between transmit and receive pairs.165.4.3Mains simulation, common mode.165.4.4Mains simulation, transverse mode.165.4.5Impulse transfer from mains, common mode.165.4.6Impulse transfer from mains, transverse mode.165.4.7Conversion of common mode to transverse mode.165.5Electro-magnetic compatibility.16Annex A (normative):Test methods.17A.1General.17A.1.1Additional information to support the test.17A.1.2Equipment connection.17A.2Test methods.18A.2.1Signal coding at output port.18A.2.2Waveform shape at output port.18SIST ETS 300 248 E1:2004



Page 4ETS 300 248: October 1993A.2.3Clock accuracy at the output port.19A.2.4Return loss at input port.20A.2.5Input loss tolerance and immunity against reflections.20A.2.6Tolerable longitudinal voltage and HDB3 input coding.22A.2.7Impedance towards ground.23A.2.8Jitter.24Annex B (normative):Definition of HDB3 code.26B.1General.26B.2Definition.26Annex C (informative):Bibliography.27History.28SIST ETS 300 248 E1:2004



Page 5ETS 300 248: October 1993ForewordThis European Telecommunication Standard (ETS) has been produced by the BusinessTelecommunications (BT) Technical Committee of the European Telecommunications Standards Institute(ETSI).This ETS results from a mandate from the Commission of the European Community (CEC) to provideharmonised standards for the support of the Directive on Open Network Provision (ONP) of leased lines(92/44/EEC).There are two other standards directly related to this ETS:ETS 300 246: "Open Network Provision (ONP) technical requirements; 2 048 kbit/s digitalunstructured leased line (D2048U), Interface presentation";ETS 300 247: "Open Network Provision (ONP) technical requirements; 2 048 kbit/s digitalunstructured leased line (D2048U), Connection characteristics".This ETS is based on information from CCITT Recommendations and ETSI publications and the relevantdocuments are quoted where appropriate.IntroductionThe Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC),concerns the harmonisation of conditions for open and efficient access to, and use of, the leased linesprovided on public telecommunications networks and the availability throughout the Community (EEC) of aminimum set of leased lines with harmonised technical characteristics.The consequence of the Directive is that Telecommunications Organisations within the EEC shall makeavailable a set of leased lines between points in these countries with specified connection characteristicsand specified interfaces.Two classes of standard will be used for the interfaces of terminal equipment designed for connection tothe ONP leased lines. European Telecommunication Standards (ETSs), which are voluntary, give the fulltechnical specifications for these interfaces, whereas Technical Basis for Regulations (TBRs) give theessential requirements under the Second Phase Directive (91/263/EEC) for attachment to the leased lines.This standard, which is an ETS, belongs to the first category. The TBR (TBR 12) is a subset of thiscorresponding ETS.ETS 300 166 and CCITT Recommendation G.703 are used as the basis for the terminal interface.SIST ETS 300 248 E1:2004



Page 6ETS 300 248: October 1993Blank pageSIST ETS 300 248 E1:2004



Page 7ETS 300 248: October 19931ScopeThis ETS specifies the full physical and electrical characteristics and corresponding test principles for aterminal equipment interface for connection to the network termination points of ONP 2 048 kbit/s digitalunstructured leased lines using 120 W interfaces.This ETS is not intended for regulatory purposes. A separate TBR (TBR 12) covers the essentialrequirements for attachment under the Second Phase Directive (91/263/EEC).This ETS is to ensure that the interface of the terminal equipment is compatible with the ONP 2 048 kbit/sdigital unstructured leased line. It is applicable to all interfaces designed for connection to the leased line,however in the cases of apparatus that carries a particular service, of complex apparatus and of apparatusin private networks, other ETSs may apply in addition to this ETS.Customer premises wiring and installation between the terminal equipment and the Network TerminationPoint (NTP) are outside the scope of this ETS.2Normative referencesThis ETS incorporates by dated or undated reference, provisions 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 to applies.[1]CCITT Recommendation G.703 (1991): "Physical/electrical characteristics ofhierarchical digital interfaces".[2]CCITT Recommendation O.151 (1988): "Error performance measuringequipment for digital systems at the primary rate and above".[3]EN 60950 (1992): "Safety of information technology equipment includingelectrical business equipment".[4]ETS 300 046-2 (1992): "Integrated Services Digital Network (ISDN); Primaryrate access - safety and protection, Part 2: Interface Ia - safety".[5]ETS 300 046-3 (1992): "Integrated Services Digital Network (ISDN); Primaryrate access - safety and protection, Part 3: Interface Ia - protection".[6]ISO/IEC 10173 (1991): "Information technology - Integrated Services DigitalNetwork (ISDN) primary access connector at reference points S and T".NOTE:This ETS also contains a number of informative references which have been included toindicate the sources from which various material has been derived, hence they do nothave an associated normative reference number. Details of these publications are givenin Annex C. In some cases the same publication may have been referenced in both anormative and an informative manner.3DefinitionsFor the purposes of this ETS, the following definitions apply:Leased lines: the telecommunications facilities provided by a public telecommunications network thatprovide defined transmission characteristics between network termination points and that do not includeswitching functions that the user can control, (e.g. on-demand switching).SIST ETS 300 248 E1:2004



Page 8ETS 300 248: October 1993Network Termination Point (NTP): all physical connections and their technical access specificationswhich form part of the public telecommunications network and are necessary for access to, and efficientcommunication through, that public network.Safety Extra-Low Voltage (SELV) circuit: a secondary circuit which is so designed and protected thatunder normal and single fault conditions the voltage between any two accessible parts, or between oneaccessible part and the equipment protective earthing terminal for a class I equipment, does not exceed asafe value (subclause 1.2.8.5 of EN 60950 [3]).Terminal Equipment (TE): equipment intended to be connected to the public telecommunications network,i.e.:a)to be connected directly to the termination of a public telecommunications network; orb)to interwork with a public telecommunications network being connected directly orindirectly to the termination of a public telecommunications network,in order to send, process, or receive information.4Symbols and abbreviationsFor the purposes of this ETS, the following abbreviations apply:D2048U2 048 kbit/s digital unstructured ONP leased lineDCDirect CurrentEMCElectro-Magnetic CompatibilityHDB3High Density Bipolar code of order 3 (see Annex B)ONPOpen Network ProvisionNTPNetwork Termination Pointppmparts per millionPRBS(215-1)Pseudo Random Bit Sequence (as defined in § 2.1 of CCITT RecommendationO.151 [2])RXReceive (a signal input at either the terminal equipment interface or the testequipment)rmsroot mean squareSELVSafety Extra-Low VoltageSDHSynchronous Digital HierarchyTETerminal EquipmentTXTransmit (a signal output at either the terminal equipment interface or the testequipment)UIUnit IntervalSIST ETS 300 248 E1:2004



Page 9ETS 300 248: October 19935RequirementsThe 2 048 kbit/s unstructured leased line provides a bidirectional point-to-point digital leased line with ausable bit rate of 2 048 kbit/s where timing is not provided from the network. The provision of circuit timingis the responsibility of the user. No structuring of the data is provided by the network and any structuring isthe responsibility of the user.5.1Physical characteristicsRequirement: The terminal equipment shall provide an 8-contact plug of the type specified inISO/IEC 10173 [6] with contact assignments as specified in table 1. In addition, the terminal equipmentmay provide an alternative method of connection.NOTE 1:The use of a shielded cord or cable may be necessary to meet radiation and immunityrequirements defined in Electro-Magnetic Compatibility (EMC) standards.NOTE 2:The alternative connection method is primarily for the purpose of permitting hardwiredpresentations of the leased line using insulation displacement terminals and wire withsolid conductors having diameters in the range 0,4 to 0,6 mm.Test: There shall be a visual inspection that the plug is of the correct type. The contact assignments aretested indirectly through the tests in Annex A.Table 1: Contact assignmentContactTerminal interface1 & 2Receive pair3Shield reference point4 & 5Transmit pair6Shield reference point7Unused8UnusedNOTE 1:The transmit pair is the output from the terminal equipment interface. The receive pair is theinput to the terminal equipment interface, as shown in figure 1. Where the terms "output" and"input" are used without qualification in this standard, they refer to the terminal equipmentinterface.NOTE 2:For connection of the shield, or shields, to the common reference point at the NTP contacts 3and 6 shall be used.ÉÍÍÍÍÍÍÍÍÍÍÍÍ» OUTPUT
INPUT ÉÍÍÍÍÍÍÍÍÍÍÍÍ»º
TX ÇÄÄÄÄÄÄÄÄÄÄÄÄÄ>ÄÄÄÄÄÄÄÄÄÄÄÄÄĶ RX
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NETWORK
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TERMINAL
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INTERFACE º
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EQUIPMENT ºº
ÇÄÄÄÄÄÄÄÄÄÄÄÄÄ<ÄÄÄÄÄÄÄÄÄÄÄÄÄĶ
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OUTPUT ÈÍÍÍÍÍÍÍÍÍÍÍͼFigure 15.2Electrical characteristics5.2.1Output port5.2.1.1Signal codingRequirement: Coding of the digital signal transmitted at the output port shall be in accordance with HighDensity Bipolar code of order 3 (HDB3) encoding rules (see Annex B).Test: The test shall be conducted according to Annex A, subclause A.2.1.SIST ETS 300 248 E1:2004



Page 10ETS 300 248: October 19935.2.1.2Waveform shapeRequirement: The pulse at the output port shall comply with the requirements given in table 2 and figure 2,based on CCITT Recommendation G.703 [1].Test: The test shall be conducted according to Annex A, subclause A.2.2.Table 2: Waveform shape at output portPulse shapeAll marks of a valid signal shall conform(nominally rectangular)with the mask (see figure 2) irrespectiveof the polarity. The value V correspondsto the nominal peak voltage of a mark.Test load impedance120 W non-reactiveNominal peak voltage V of a mark3 VPeak voltage of a space0 ± 0,3 VNominal pulse width244 nsRatio of the amplitudes of positive and negative 0,95 to 1,05pulses at the centre of the pulse intervalRatio of the widths of positive and negative 0,95 to 1,05pulses at the nominal half amplitudeSIST ETS 300 248 E1:2004



Page 11ETS 300 248: October 1993269 ns194 ns(244 - 50)V=100%50%0%10%10%10%10%20%244 ns219 ns(244 - 25)488 ns(244 + 244)Nominal pulse20%20%10%10%(244 + 25)Figure 2: Pulse mask for 2 048 kbit/s pulse5.2.1.3Clock accuracyRequirement: Where a Terminal Equipment (TE) has an internal clock, in the absence of any externalreference signal timing, the output port shall have a bit rate of 2 048 kbit/s ± 50 ppm.Test: The test shall be conducted according to Annex A, subclause A.2.3.SIST ETS 300 248 E1:2004



Page 12ETS 300 248: October 19935.2.1.4Impedance towards groundRequirement: Where the terminal equipment has a ground, the impedance towards ground of the outputport shall be greater than 1 000 W for frequencies in the range 10 Hz to 1 MHz when measured with asinusoidal test voltage of 2 V rms. For the purpose of this requirement, ground shall be the terminalequipment common reference point or the equipment test reference point.NOTE:This requirement is included to allow transformerless implementations.Test: The test shall be conducted according to Annex A, subclause A.2.7.5.2.1.5Output jitterRequirement: The peak-to-peak output jitter shall not exceed the limits of table 3 when measured with abandpass filter with first order linear cut-off with the defined cut-off frequencies. For the purpose of testing,any signal input from which the output timing is derived shall be provided with the maximum tolerable inputjitter, and with the maximum tolerable input frequency deviation, as specified by the manufacturer.Where the output timing of the terminal equipment is taken from the leased line, the input to the terminalequipment shall be provided with components of sinusoidal jitter at points on the curve of figure 3 andtable 5 (see subclause 5.2.2.7 below).NOTE:A separate requirement for output jitter at frequencies in the range 4 Hz to 40 Hz is notrequired because this frequency band is covered sufficiently by the first order linearfilter which produces 20 dB attenuation at 4 Hz.Table 3: Maximum output jitterMeasurement filter bandwidthOutput jitterLower cut-offUpper cut-offUI peak-to-peak(high pass)(low pass)(maximum)40 Hz100 kHz0,11 UITest: The test shall be conducted according to Annex A, subclause A.2.8.5.2.1.6Output return lossThere are no requirements for output return loss under this ETS.NOTE:A requirement for output return loss may be added to this ETS when appropriatespecifications become available.5.2.1.7Output signal balanceThere are no requirements for output signal balance under this ETS.NOTE:The effects of the output signal imbalance are covered under the EMC Directive(89/336/EEC).5.2.2Input port5.2.2.1Signal codingRequirement: The input port shall correctly decode without errors HDB3 encoded signals in accordancewith HDB3 encoding rules (see Annex B).Test: The test shall be conducted according to Annex A, subclause A.2.6.SIST ETS 300 248 E1:2004



Page 13ETS 300 248: October 19935.2.2.2Input return lossRequirement: The input return loss with respect to 120 W at the interface shall be greater than or equal tothe values given in table 4 taken from § 6.3.3 of CCITT Recommendation G.703 [1].Table 4: Input port minimum return lossFrequency rangeReturn loss51 kHzto102 kHz12 dB102 kHzto2 048 kHz18 dB2 048 kHzto3 072 kHz14 dBTest: The test shall be conducted according to Annex A, subclause A.2.4.5.2.2.3Input loss toleranceRequirement: The input port shall correctly decode without errors a 2 048 kbit/s signal as defined insubclauses 5.2.1.1 and 5.2.1.2 above but modified by a cable or artificial cable with the followingcharacteristics:a)attenuation that follows a ´f law with values throughout the range 0 to 6 dB at 1 024 kHz; andb)characteristic impedance of 120 W with a tolerance of ± 20 % in the frequency range from 200 kHzup to, but not including, 1 MHz, and ± 10 % at 1 MHz.Test: The test shall be according to Annex A, subclause A.2.5.5.2.2.4Immunity against reflectionsRequirement: When a signal comprising a combination of a normal signal and an interfering signal isapplied to the input port, via an artificial cable with a loss in the range 0 dB to 6 dB at 1 MHz, no errorsshall result due to the interfering signal.The normal signal shall be a signal encoded according to HDB3, shaped according to the mask of figure 2and with a binary content in accordance with a Pseudo Random Bit Sequence as defined in § 2.1 of CCITTRecommendation O.151 [2] (PRBS(215-1)).The interfering signal shall be the same as the normal signal except that the level shall be attenuated by18 dB, the bit rate shall be within 2 048 kbit/s ± 50 ppm and not synchronised to the normal signal.Test: The test shall be conducted according to Annex A, subclause A.2.5.5.2.2.5Tolerable longitudinal voltagesRequirement: The receiver shall operate without errors with any input signal in the presence of alongitudinal voltage of magnitude 2 V rms over the frequency range 10 Hz to 30 MHz.NOTE:This requirement is included to allow transformerless implementations.Test: The test shall be conducted according to Annex A, subclause A.2.6.5.2.2.6Impedance towards groundRequirement: Where the terminal equipment has a ground, the impedance towards ground of the inputport shall be greater than 1 000 W for frequencies in the range 10 Hz to 1 MHz when measured with asinusoidal test voltage of 2 V rms. For the purpose of this requirement, ground shall be the terminalequipment common reference point or the equipment test reference point.NOTE:This requirement is included to allow transformerless implementations.SIST ETS 300 248 E1:2004



Page 14ETS 300 248: October 1993Test: The test shall be conducted according to Annex A, subclause A.2.7.5.2.2.7Input jitter toleranceRequirement: The terminal equipment shall tolerate at its input port the maximum input jitter as shown intable 5 and figure 3.NOTE:Terminal equipment with more than one input will normally need to be designed with awander buffer of at least 18 microseconds, however, to accomodate the wander thatmay be produced by Synchronous Digital Hierarchy (SDH) networks, up to 40microseconds may be needed.Table 5: Input jitter tolerancePeak-to-peak amplitude (UI)Frequency (Hz)A1A2f1f2f3f41,50,2202 40018 000100 000peak-to-peak jitterpeak-to-peak jitterjitter frequencyjitter frequencyf1f1f2f2f3f3f4f4A1A1A2A2Figure 3: Input jitter toleranceTest: The test shall be conducted according to Annex A, subclause A.2.8.5.2.2.8Input clock toleranceRequirement: The terminal equipment shall correctly decode without error HDB3 encoded signals over thefrequency range 2 048 kbit/s ± 50 ppm.Test: The test shall be conducted in accordance with Annex A, subclause A.2.8.SIST ETS 300 248 E1:2004



Page 15ETS 300 248: October 19935.3Safety5.3.1General requirementsRequirement: The terminal equipment interface shall comply with the requirements for accessible parts ofan Safety Extra-Low Voltage (SELV) circuit.Test: The test shall be conducted according to EN 60950 [3].NOTE:Designers should take into account the minimum impedance towards ground specifiedin this ETS.5.3.2Touch currentThis requirement recognises the fact that the terminal equipment is likely to have a mains electricity supplyinterface. If the terminal equipment does not have a mains supply, this requirement is not applicable.For the purpose of the following requirement, the term referred to as Ia in ETS 300 046-2 [4] shall bedeemed to be the point of test referred to in Annex A, subclause A.1.2.For the purpose of the following requirement the connection to the interface cable shield as defined inETS 300 046-2 [4] shall only be made when a shielded cable is provided with the terminal equipment.Requirement: The touch current measured across the terminal equipment interface shall not exceed0,25 mA.Test: The test shall be conducted according to ETS 300 046-2 [4].5.4Overvoltage protectionOvervoltage protection shall be in accordance with the methods described in ETS 300 046-3 [5] asdetailed below. The compliance criteria for the overvoltage protection tests of subclauses 5.4.1 to 5.4.7shall be:the terminal equipment shall operate properly within the limits of this specification after the testwithout:-the need for resetting the fault protection facilities; or-the need to change any hardware component; or-reloading of data other than data of a type declared in the operating instructions to beunprotected data.For the purpose of the following subclauses on protection, the term "interface" refers to the connectionmade by the terminal equipment to the leased line.For the purpose of the following subclauses on protection, the term referred to as Ia in ETS 300 046-3 [5]shall be deemed to be the point of test referred to in Annex A, subclause A.1.2.5.4.1Surge simulation, common modeRequirement: The interface shall meet the compliance criteria after 10 common mode surges of 1 kV(1,2/50 µs) on the terminal equipment interface.Test: The test shall be conducted according to subclause 5.5.1 of ETS 300 046-3 [5].SIST ETS 300 248 E1:2004



Page 16ETS 300 248: October 19935.4.2Surge simulation, transverse mode between transmit and receive pairsRequirement: The interface shall meet the compliance criteria after 10 transverse mode surges of 250 V(1,2/50 µs) on the terminal equipment interface between the transmit and receive pairs.Test: The test shall be conducted according to subclause 5.5.2 of ETS 300 046-3 [5].5.4.3Mains simulation, common modeRequirement: If the terminal equipment is supplied from the mains, the interface shall meet thecompliance criteria after 10 common mode surges of 2,5 kV (10/700 µs).Test: The test shall be conducted according to subclause 5.6.1 of ETS 300 046-3 [5].5.4.4Mains simulation, transverse modeRequirement: If the terminal equipment is supplied from the mains, the interface shall meet thecompliance criteria after 10 transverse mode surges of 2,5 kV (10/700 µs).Test: The test shall be conducted according to subclause 5.6.2 of ETS 300 046-3 [5].5.4.5Impulse transfer from mains, common modeRequirement: If the interface is supplied from the mains, it shall transfer less than 1 kV common modevoltage and less than 250 V transverse voltage to the terminal equipment interface when a common modesurge of either polarity and of 2,5 kV (10/700 µs) is applied to the mains supply port.Test: The test shall be conducted according to subclause 5.7.1 of ETS 300 046-3 [5].5.4.6Impulse transfer from mains, transverse modeRequirement: If the interface is supplied from the mains, it shall transfer less than 1 kV common modevoltage and less than 250 V transverse voltage to the terminal equipment interface when a transversemode surge of either polarity and of 2,5 kV (10/700 µs) is applied to the mains supply port.Test: The test shall be conducted according to subclause 5.7.1 of ETS 300 046-3 [5].5.4.7Conversion of common mode to transverse modeRequirement: The transverse mode voltage shall not be more than 250 V peak when 2 common modesurges of 1 kV (1,2/50 µs) (one of each polarity) are applied to the terminal equipment interface.Test: The test shall be conducted according to subclause 5.7.3 of ETS 300 046-3 [5].5.5Electro-magnetic compatibilityThere are no EMC requirements under this ETS.NOTE:General EMC requirements are imposed under the EMC Directive (89/336/EEC).Requirements for conducted emissions and immunity to continuous conducted signalswill be added to this ETS when appropriate specifications become available if theserequirements are not imposed under the EMC Directive.SIST ETS 300 248 E1:2004



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