SIST EN 300 132-2 V2.2.1:2007

• Abstract:

  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.

• Status: Published
• Publication Date: 04-Nov-2007
• ICS: 19.040 - Environmental testing
• ICS: 33.050.01 - Telecommunication terminal equipment in general
• Technical Committee: I16 - ETSI Technical Committee
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Oct-2007
• Due Date: 22-Dec-2007
• Completion Date: 05-Nov-2007
• Ref Project: ETSI EN 300 132-2 V2.2.1 (2007-05) - Environmental Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (DC)

SIST EN 300 132-2 V2.2.1:2007 is an ETSI European Standard published by SIST for the power supply interface at the input to telecommunications equipment operated by direct current (dc). It specifies the interface characteristics, operating ranges, protection behavior, and measurement methods used so dc power systems and telecommunications equipment can work together at interface "A". It is written for equipment designers, operators, test labs, and buyers who need a common -48 Vdc telecom power interface.

What does SIST EN 300 132-2 V2.2.1:2007 specify?

SIST EN 300 132-2 V2.2.1:2007 specifies the output performance of dc power equipment at interface "A" and the dc input behavior of telecommunications equipment connected to that interface. The document is organized into scope, references, definitions, requirements, earthing and bonding, electrical safety, EMC, and informative annexes.

The standard is focused on -48 Vdc interfaces. Annex A gives guidance for working with existing -60 Vdc systems during a transitional period.

Annex	What it covers
Annex A	Guidance for existing -60 Vdc systems
Annex B	Measuring inrush current and transferring pulse recordings to the limit chart
Annex C	Test arrangements for injecting electrical noise at interface "A"
Annex D	Identification of interface "A"
Annex E	Wideband noise, including measurement and calculation
Annex F	Protection dimensioning
Annex G	Bibliography

What are the key requirements of SIST EN 300 132-2 V2.2.1:2007?

Voltage ranges and recovery behavior

SIST EN 300 132-2 V2.2.1:2007 sets the nominal interface voltage at -48 Vdc and gives the normal service range as -40,5 Vdc to -57,0 Vdc. In practice, equipment should run within that range, although the lower part of the range may bring slight service degradation.

The standard also defines abnormal steady-state ranges that the equipment must survive without damage. When the supply returns to normal, the power conversion and management functions on the load side are expected to restore service automatically without manual intervention.

Transients and voltage changes

SIST EN 300 132-2 V2.2.1:2007 requires verification against voltage transients using the EN 61000-4-5 combination wave generator. The test applies a 500 V positive overvoltage with the specified battery grounding conditions, and the equipment must not be damaged.

The document also covers voltage changes caused by regulation of the power supply, such as end cell switching. The tested equipment must keep operating to specification, without data loss or false alarms.

Protection and current behavior

SIST EN 300 132-2 V2.2.1:2007 requires the supply at interface "A" to be protected by circuit breakers, fuses, or similar devices. It also limits the maximum current drain after abnormal service to 1,5 times the maximum continuous current drain at nominal voltage for longer than 1 second.

For connection events, the document controls inrush current with a time-versus-current limit curve. This matters because the power system and its protection devices must tolerate start-up surges without nuisance tripping.

Conducted noise on the dc interface

SIST EN 300 132-2 V2.2.1:2007 sets conducted immunity and emissions requirements for narrowband noise at interface "A", with specified frequency ranges and measurement bandwidths. Wideband noise can also be measured or calculated using the method in Annex E.

For users, this means the power interface must not only deliver dc power, but also avoid introducing interference that disturbs other load units on the same supply.

Earthing, safety, and EMC boundaries

SIST EN 300 132-2 V2.2.1:2007 refers earthing and bonding of telecommunications equipment in telecommunication centres to ETSI EN 300 253. It also states that electrical safety requirements and general EMC requirements are covered by relevant safety and EMC standards rather than by this document.

What terms does SIST EN 300 132-2 V2.2.1:2007 define?

• interface "A" - The terminals where the power supply connects to the system block; it is the point to which the requirements apply.
• system block - A functional group of equipment that depends on connection to the same power supply.
• load unit - Power-consuming equipment that forms part of a system block.
• normal service voltage range - The steady-state voltage range over which the equipment maintains normal service.
• abnormal voltage range - The steady-state voltage range in which the equipment is not expected to maintain normal service, but should survive undamaged.
• fully equipped equipment - The equipment configuration corresponding to maximum power consumption at -48 Vdc.
• LISN - Line Impedance Stabilization Network, used in current and noise measurements to simulate the supply network.

Who uses SIST EN 300 132-2 V2.2.1:2007?

SIST EN 300 132-2 V2.2.1:2007 is used by telecom equipment manufacturers, power supply designers, system integrators, test laboratories, and network operators. They use it to specify power interfaces, check compatibility between supply and load equipment, design protection, and plan type tests for voltage behavior, inrush current, and conducted noise.

It is also relevant to engineers working in telecommunication centres and customer premises where several load units share the same dc supply interface. Quality and procurement teams use it to compare products on a common technical basis.

Which standards are used with SIST EN 300 132-2 V2.2.1:2007?

The document cites these references and companion parts:

• IEC 60269-1 - low-voltage fuses, used for the fuse behavior referenced in inrush and protection discussions.
• CENELEC EN 60934 - circuit-breakers for equipment, used for magnetic circuit-breaker behavior in protection and inrush context.
• ETSI EN 300 253 - earthing and bonding of telecommunication equipment in telecommunication centres.
• ITU-T Recommendations Q.551, Q.552, Q.553, Q.554 - transmission characteristics used in the wideband noise discussion.
• ITU-T Recommendation O.41 - psophometer requirements for wideband noise measurement.
• CENELEC EN 61000-4-5 - surge immunity test, used for the transient test at interface "A".
• ETSI Part 1 and Part 3 of the same multi-part deliverable - Part 1 covers ac operated from dc sources, and Part 3 covers rectified current source, alternating current source, or dc source up to 400 V.

What does the SIST EN 300 132-2 V2.2.1:2007 document contain?

The document contains the main requirement clauses for voltage ranges, transient immunity, power supply protection, inrush current, and conducted immunity/emissions at interface "A". It also includes a figure identifying interface "A" and several test circuits for transient, inrush, and noise measurements.

Annex B explains how to measure inrush current and how to plot the recorded pulse against the limit chart. Annex C gives an example arrangement for injecting electrical noise, and Annex E explains both measurement and calculation of wideband noise using a psophometric filter and formulas.

Annex F gives practical guidance on protection dimensioning, including how inrush and current changes affect fuse and breaker selection. Annex D shows example interface configurations, which helps users decide where the interface point is in real installations.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Okoljski inženiring (EE) - Napajalni vmesnik na vhodu v telekomunikacijsko opremo - 2. del: Obratovanje z enosmerno napetostjo (dc)Environmental Engineering (EE) - Power supply interface at the input to telecommunications equipment - Part 2: Operated by direct current (dc)33.050.01Telekomunikacijska terminalska oprema na splošnoTelecommunication terminal equipment in general19.040Preskušanje v zvezi z okoljemEnvironmental testingICS:Ta slovenski standard je istoveten z:EN 300 132-2 Version 2.2.1SIST EN 300 132-2 V2.2.1:2007en01-december-2007SIST EN 300 132-2 V2.2.1:2007SLOVENSKI
STANDARD
ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 2
Reference REN/EE-02008[3] Keywords interface, power supply ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
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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). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http://portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No 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 2007. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 3
Contents Intellectual Property Rights.5 Foreword.5 1 Scope.6 2 References.7 3 Definitions, symbols and abbreviations.8 3.1 Definitions.8 3.2 Symbols.9 3.3 Abbreviations.9 4 Requirements.9 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 conditions.10 4.3.2 Recovery from steady state abnormal voltage.10 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 conditions.11 4.4.2 Performance criteria.11 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 Limits.12 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 4.9.1 Emissions of narrow-band noise.15 5 Earthing and bonding.16 6 Electrical safety requirements.17 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 Measurement.19 B.2 Pulse waveform transformation.19 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 noise.27 E.1 Emission of wideband noise.27 E.1.1 Assessment of wideband noise.27 E.2 How to calculate wideband emission.27 SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 4
Annex F (informative): Protection dimensioning.31 Annex G (informative): Bibliography.32 History.33
ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 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 adoption of this EN: 18 May 2007 Date of latest announcement of this EN (doa): 31 August 2007 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
29 February 2008 Date of withdrawal of any conflicting National Standard (dow): 29 February 2008
ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 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. SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 7
Interface "A"telecommunicationsequipmentSystem blockDC 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". SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 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 SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 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 Networks 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. SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 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 abnormal voltage Following the restoration of the supply to the normal voltage range, the power conversion and management systems on the load side of interface "A" shall automatically restore service. The telecommunications equipment shall then resume operation according to its specifications. The abnormal service voltage shall not lead to the disconnection of the power supply e.g. by causing circuit breakers, fuses or other such devices to operate. NOTE: It is acceptable that the system may restart when the voltage is -40,5 V or greater within the nominal service voltage range and/or after a time delay. 4.3.3 Voltage transients Voltage transients may occur at interface "A" when faults occur in the power distribution system. These transients are characterized by a voltage drop in the range: 0 Vdc to 40,5 Vdc, followed by an overvoltage often in excess of the maximum steady state abnormal service voltage range and dependent upon the power distribution up to interface "A" and the equipment connected to interface "A".
The performance of telecommunication equipment against this abnormal overvoltage shall be verified using the combination wave generator defined in the basic standard EN 61000-4-5 [9]. This generator has the pulse shape of 1,2µs-rise time/50µs-duration in open circuit and 8µs-rise time/20µs-duration in short circuit. The voltage transient wave generator test circuit is shown in figure 2. Telecommunication
equipment
EUTInterface "A"Wave GeneratorCDN+-d.c. power sourceCDNR
2Ω
Figure 2: Voltage transient generator wave test circuit SIST EN 300 132-2 V2.2.1:2007

ETSI ETSI EN 300 132-2 V2.2.1 (2007-05) 11 The test has to be performed applying an overvoltage of 500V (positive polarity, r
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