ETSI EN-300-132-2-V2.2.2-2007.pdf

ETSI EN 300 132-2 V2.2.2 (2007-10) European Standard (Telecommunications series) Environmental Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (dc) ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 2 Reference REN/EE-020084 Keywords interface, power supply ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). 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ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 3 Contents Intellectual Property Rights5 Foreword.5 1 Scope6 2 References7 3 Definitions, symbols and abbreviations .8 3.1 Definitions8 3.2 Symbols9 3.3 Abbreviations.9 4 Requirements9 4.1 Nominal voltage.9 4.2 Normal service voltage range at interface “A“.9 4.3 Abnormal service voltage range at interface “A“.10 4.3.1 Abnormal service voltage under steady-state conditions10 4.3.2 Recovery from steady state abnormal voltage10 4.3.3 Voltage transients .10 4.3.4 Recovery from voltage transients .11 4.4 Voltage changes due to the regulation of the power supply.11 4.4.1 Test conditions11 4.4.2 Performance criteria11 4.5 Supply protection at interface “A“12 4.6 Maximum current drain following abnormal service.12 4.7 Inrush Current on connection of interface “A“.12 4.7.1 Limits12 4.7.2 Measurements.13 4.8 Conducted immunity requirements of the telecommunications equipment at interface “A“13 4.8.1 Immunity to narrowband noise.14 4.9 Conducted emissions requirements of the telecommunications equipment at interface “A“15 5 Earthing and bonding.17 6 Electrical safety requirements17 7 EMC requirements .17 Annex A (informative): -60 VDC systems 18 Annex B (informative): Guide for measuring inrush current and for transferring the recorded pulses onto the limit chart.19 B.1 Measurement19 B.2 Pulse waveform transformation19 B.3 Measurement of inrush current with filter capacitor current pulses.22 Annex C (informative): Test arrangements for the injection of electrical noise at interface “A“25 Annex D (informative): Identification of interface “A“26 Annex E (informative): Wideband noise27 E.1 Emission of wideband noise.27 E.1.1 Assessment of wideband noise.27 E.2 How to calculate wideband emission.27 ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 4 Annex F (informative): Protection dimensioning31 Annex G (informative): Bibliography.32 History33 ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Environmental Engineering (EE). The present document concerns the requirements for the interface between telecommunications equipment and its power supply, and includes requirements relating to its stability and measurement. Various other references and detailed measurement and test arrangements are contained in informative annexes. The present document is part 2 of a multi-part deliverable covering Environmental Engineering (EE); Power supply interface at the input to telecommunications equipment, as identified below: Part 1: “Operated by alternating current (ac) derived from direct current (dc) sources“; Part 2: “Operated by direct current (dc)“; Part 3: “Operated by rectified current source, alternating current source or direct current source up to 400 V“. National transposition dates Date of latest announcement of this EN (doa): 31 January 2008 Date of latest publication of new National Standard or endorsement of this EN (dop/e): 31 July 2008 Date of withdrawal of any conflicting National Standard (dow): 31 July 2008 ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 6 1 Scope The present document contains requirements for: - the output performance of the direct current (DC) power equipment at the interface “A“; - the input of the telecommunications equipment connected to interface “A“ powered by DC. The DC voltage at interface “A“ may be derived from the AC primary supply. The DC supply may incorporate a backup battery. If any other equipment e.g. datacom equipment, are connected to interface “A“ in parallel to telecommunications equipment, all requirements addressed in clause 4 of the present document must be fulfilled. The present document aims at providing compatibility between the power supply equipment and the power consuming telecommunications equipment, and also between different system blocks connected to the same power supply. NOTE 1: The present document is applicable only to -48 VDC power supply interfaces. However, during a transitional period, other DC voltages may be used in existing installations. Annex A gives guidance on working in conjunction with existing -60 VDC supply systems. The power supply interface, interface “A“, is a physical point to which all the requirements are related (see figure 1). This point is situated between the power supply system(s) and the power consuming telecommunications equipment. NOTE 2: Interface “A“ is located at the power terminals of the telecommunications equipment. Subject to the installation preconditions this point may be located at any other point between the power supply system and the telecommunications equipment by mutual agreement of the relevant parties. The requirements at interface “A“ apply to: - the output of the power supply equipment or power supply installation of telecommunications centres; - the power supply input of telecommunications equipment installed at telecommunication centres; - telecommunications equipment, installed in customers' premises, whose DC interface “A“ is also used by equipment requiring a supply to this specification. NOTE 3: Normally there is more than one load unit connected to interface “A“. In these cases, interface “A“ will undergo further restrictions with respect to noise limits or other disturbances specified in clause 4.8. NOTE 4: Disturbances on the power supply interface “A“ relating to the continuous wave phenomena below 20 kHz are covered within the present document. NOTE 5: An example of a configuration in which interface “A“ is identified is given in annex D. ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 7 Interface “A“ telecommunications equipment System block DC power supply conductors Figure 1: Identification of interface “A“ The purpose of the present document is: - to use a power supply system with the same characteristics for all telecommunications equipment defined in the area of application; - to facilitate inter working of different (types of) load units; - to facilitate the standardization of telecommunications equipment; - to facilitate the installation, operation and maintenance in the same network of equipment and telecommunications systems from different origins. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 1 IEC 60269-1: “Low-voltage fuses - Part 1: General requirements“. 2 CENELEC EN 60934: “Circuit-breakers for equipment (CBE)“. 3 ETSI EN 300 253: “Environmental Engineering (EE); Earthing and bonding of telecommunication equipment in telecommunication centres“. 4 ITU-T Recommendation Q.551: “Transmission characteristics of digital exchanges“. 5 ITU-T Recommendation Q.552: “Transmission characteristics at 2-wire analogue interfaces of digital exchanges“. ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 8 6 ITU-T Recommendation Q.553: “Transmission characteristics at 4-wire analogue interfaces of digital exchanges“. 7 ITU-T Recommendation Q.554: “Transmission characteristics at digital interfaces of digital exchanges“. 8 ITU-T Recommendation O.41: “Psophometer for use on telephone-type circuits“. 9 CENELEC EN 61000-4-5: “Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: abnormal voltage range: range of steady-state voltage over which the equipment will not be expected to maintain normal service but will survive undamaged customer premises: any location which is the sole responsibility of the customer fully equipped equipment: generally there are several maximum configurations because different boards can be used in the same slots NOTE: The fully-equipped equipment configuration shall be the configuration that corresponds to the maximum power consumption measured at -48 VDC e.g. not in standby mode. interface “A“: terminals at which the power supply is connected to the system block NOTE 1: See also figure 1. NOTE 2: This is a functional definition and not an exact depiction of the physical location. load unit: power-consuming equipment, that is part of a system block maximum continuous input current: maximum continuous input current, stated by the manufacturer, for a fully-equipped equipment under test connected to interface “A“, at nominal voltage (accordance clauses 4.6 and 4.7.1 of the present document) nominal voltage: nominal value of the voltage that designates the type of supply normal service: service mode where telecommunications equipment operates within its specification normal service voltage range: range of steady-state voltages over which the equipment will maintain normal service power supply: power source to which telecommunications equipment is intended to be connected system block: functional group of equipment depending for its operation and performance on its connection to the same power supply NOTE: A system block may consist of equipment or a functional group of equipment. Different examples of configurations at interface “A“ are given in annex D. telecommunication centre: location where telecommunications equipment is installed and which is the sole responsibility of the operator ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 9 3.2 Symbols For the purposes of the present document, the following symbols apply: It instantaneous surge current (see clause 4.7.1) Im maximum continuous input current L inductance of inductive element of LISN R resistance of resistive element of LISN t time Zc capacitive impedance of immunity measurement circuit Zm resistive impedance of immunity measurement circuit 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: CDN Coupling/Decoupling Network DC direct current NOTE: Also when used as a suffix to units of measurement. EMC ElectroMagnetic Compatibility EUT Equipment Under Test LISN Line Impedance Stabilization Network RF Radio Frequency rms root mean square NOTE: Also when used as a suffix to units of measurement. 4 Requirements 4.1 Nominal voltage The nominal value of the voltage at interface “A“ shall be -48 VDC (positive conductor is connected to earth). NOTE 1: In most cases the voltage of interface “A“ will be complemented by a 24 cell lead-acid battery. NOTE 2: During a transitional period, other DC voltages may be used in existing installations. Annex A gives guidance on merging equipment with existing -60 VDC supply systems. 4.2 Normal service voltage range at interface “A“ The normal service voltage range for the -48 VDC nominal supply at interface “A“ shall be -40,5 VDC to -57,0 VDC. NOTE 1: The minimum voltage is based on the voltage drop in the distribution network and a battery cell end of discharge voltage. NOTE 2: The voltages specified are measured at interface “A“. It should be noted that if interface “A“ is at any point other than the telecommunications equipment interface there will be a voltage drop between interface “A“ and the equipment terminals. NOTE 3: When the voltage is in the range -40,5 VDC to -44,0 VDC it is recognized that there may be a slight degradation of service performance. ETSI ETSI EN 300 132-2 V2.2.2 (2007-10) 10 4.3 Abnormal service voltage range at interface “A“ 4.3.1 Abnormal service voltage under steady-state conditions Telecommunications equipment operated at -48 VDC shall not suffer any damage when subjected to the following voltage ranges: 0,0 VDC to -40,5 VDC and -57,0 VDC to -60,0 VDC 4.3.2 Recovery from steady state abno