SIST EN 300 132-2 V2.4.6:2012
(Main)Environmental Engineering (EE) - Power supply interface at the input to telecommunications and datacom (ICT) equipment - Part 2: Operated by -48 V direct current (dc)
Environmental Engineering (EE) - Power supply interface at the input to telecommunications and datacom (ICT) equipment - Part 2: Operated by -48 V direct current (dc)
To prepare a new version of EN 300 132-2 taking in to account the related contributions presented and discussed during the EE#31, EE#32 and EE#33 meetings and contributions/proposals forwarded by correspondence two months before EE#34. Clarify the equipments covered by EN 300 132-2 and the applicability of EN 300 132-2 on equipment not located in telecom centers: Street cabinet, shelters selecting which requirement of the standard are applicable at this installation.
Okoljski inženiring (EE) - Napajalni vmesnik na vhodu v telekomunikacijsko in podatkovno-komunikacijsko opremo - 2. del: Obratovanje z enosmerno napetostjo -48 V (dc)
Ta dokument vsebuje zahteve in meritvene metode za fizični vmesnik, ki je med napajalnim sistemom/sistemi ter telekomunikacijsko in podatkovno-komunikacijsko opremo, ki porablja električno energijo; ta točka se imenuje vmesnik »A«, kot je določeno v točki 4.
Namen tega dokumenta je uporaba napajalnega sistema z enakimi karakteristikami za vso telekomunikacijsko in podatkovno-komunikacijsko opremo, ki je določena za področje uporabe, zaradi:
– omogočanja medsebojnega delovanja različnih (vrst) napajalnih enot;
– omogočanja standardizacije telekomunikacijske in podatkovno-komunikacijske opreme;
– omogočanje nameščanja, delovanja in vzdrževanja telekomunikacijske in podatkovno-komunikacijske opreme ter sistemov različnega izvora v istem omrežju.
Cilj tega dokumenta je zagotavljanje električne kompatibilnosti med napajalno opremo ter telekomunikacijsko in podatkovno-komunikacijsko opremo, ki porablja električno energijo, ter tudi med različnimi sistemskimi bloki, povezanimi na isti vir napajanja.
Zahteve so določene za:
– izhod napajalne opreme ali inštalacije napajanja v telekomunikacijskih središčih, ki vmesnik »A« oskrbuje z elektriko;
– napajalni vhod vseh vrst telekomunikacijske in podatkovno-komunikacijske opreme, nameščene v telekomunikacijskih središčih in povezane z vmesnikom »A«, ki se napaja z enosmerno napetostjo;
– vse vrste telekomunikacijske in podatkovno-komunikacijske opreme, nameščene v omrežjih za dostop in prostorih strank, pri katerih vmesnik »A« z enosmerno napetostjo prav tako uporablja oprema, ki zahteva napajanje v skladu s tem dokumentu;
– vse vrste telekomunikacijske in podatkovno-komunikacijske opreme z enosmerno napetostjo, ki se uporablja v stacionarnih in mobilnih omrežjih, nameščenih na različnih lokacijah, kot so stavbe, pokriti prostori, cestne omarice.
Motnje v napajalnem vmesniku »A«, povezane s pojavom kontinuiranega vala pod 20 kHz, so opisane v tem dokumentu.
Ta dokument ne opisuje varnostnih zahtev; opisane so v ustreznih varnostnih standardih.
Ta dokument ne opisuje zahtev za elektromagnetno združljivost; opisane so v ustreznih standardih za elektromagnetno združljivost.
OPOMBA 1: Ta dokument velja le za napajalne vmesnike z enosmerno napetostjo –48 V. Vendar se lahko v prehodnem obdobju v obstoječih inštalacijah uporabljajo druge enosmerne napetosti. Dodatek B vsebuje usmeritve za delovanje z obstoječimi napajalnimi sistemi z enosmerno napetostjo –60 V.
OPOMBA 2: Enosmerna napetost v vmesniku »A« lahko izhaja iz primarnega izmeničnega napajanja. Enosmerno napajanje lahko vključuje rezervno baterijo.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 300 132-2 V2.4.6:2012
01-februar-2012
Okoljski inženiring (EE) - Napajalni vmesnik na vhodu v telekomunikacijsko in
podatkovno-komunikacijsko opremo - 2. del: Obratovanje z enosmerno napetostjo
-48 V (dc)
Environmental Engineering (EE) - Power supply interface at the input to
telecommunications and datacom (ICT) equipment - Part 2: Operated by -48 V direct
current (dc)
Ta slovenski standard je istoveten z: EN 300 132-2 Version 2.4.6
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST EN 300 132-2 V2.4.6:2012 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 300 132-2 V2.4.6:2012
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SIST EN 300 132-2 V2.4.6:2012
ETSI EN 300 132-2 V2.4.6 (2011-12)
European Standard
Environmental Engineering (EE);
Power supply interface at the input to
telecommunications and datacom (ICT) equipment;
Part 2: Operated by -48 V direct current (dc)
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SIST EN 300 132-2 V2.4.6:2012
2 ETSI EN 300 132-2 V2.4.6 (2011-12)
Reference
REN/EE-02016
Keywords
interface, power supply
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SIST EN 300 132-2 V2.4.6:2012
3 ETSI EN 300 132-2 V2.4.6 (2011-12)
Contents
Intellectual Property Rights . 5
Foreword . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 7
2.2 Informative references . 7
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
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 range under steady state conditions . 10
4.3.2 Abnormal conditions: voltage variations, dips and short interruptions . 10
4.3.3 Voltage transients . 11
4.3.3.1 Voltage transient due to short-circuit and protective device clearance . 11
4.3.3.2 Short voltage transient due to switching and lightning . 11
4.3.4 Recovery from voltage transients . 11
4.4 Voltage changes due to the regulation of the power supply . 12
4.5 Power supply protection at interface "A" . 12
4.6 Maximum current drain . 12
4.7 Inrush Current on connection of interface "A" . 13
4.7.1 Limits . 13
4.7.2 Measurements . 14
4.8 Conducted immunity requirements of the telecommunications equipment at interface "A": narrowband
noise . 15
4.9 Conducted emissions requirements of the telecommunications and datacom (ICT) equipment at
interface "A" . 17
5 Earthing and bonding . 18
Annex A (normative): Identification of interface "A" . 19
Annex B (informative): -60 V systems . 20
DC
Annex C (informative): Guide for measuring inrush current and for transferring the
recorded pulses onto the limit chart . 21
C.1 Measurement . 21
C.2 Pulse waveform transfor mation . 21
C.3 Measurement of inrush current with filter capacitor current pulses . 24
Annex D (informative): Test arrangements for the injection of electrical noise at interface
"A" . 27
Annex E (informative): Wideband noise . 28
E.1 Emission of wideband noise . 28
E.1.1 Assessment of wideband noise . 28
E.2 How to calculate wideband emission . 28
Annex F (informative): Protection dimensioning . 32
ETSI
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SIST EN 300 132-2 V2.4.6:2012
4 ETSI EN 300 132-2 V2.4.6 (2011-12)
Annex G (informative): Effects of protective device operation transients in the power
distribution . 33
Annex H (informative): Bibliography . 34
History . 35
ETSI
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SIST EN 300 132-2 V2.4.6:2012
5 ETSI EN 300 132-2 V2.4.6 (2011-12)
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://ipr.etsi.org).
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 (EN) has been produced by ETSI Technical Committee Environmental Engineering (EE).
The present document concerns the requirements for the interface between telecommunications and datacom (ICT)
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 and datacom (ICT) equipment, as identified below:
Part 1: "Operated by alternating current (ac) derived from direct current (dc) sources";
Part 2: "Operated by -48 V direct current (dc)";
Part 3-0: "Operated by rectified current source, alternating current source or direct current source up to 400 V,
Sub-part 0: Overview";
Part 3-1: "Operated by rectified current source, alternating current source or direct current source up to 400 V;
Sub-part 1: Direct current source up to 400 V";
Part 3-2: "Operated by rectified current source, alternating current source or direct current source up to 400 V;
Sub-part 2: Alternating up to 400 V solution";
Part 3-3: "Operated by rectified current source, alternating current source or direct current source up to 400 V;
Sub-part 3: Rectified current up to 400 V solution".
National transposition dates
Date of adoption of this EN: 9 December 2011
Date of latest announcement of this EN (doa): 31 March 2012
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 September 2012
Date of withdrawal of any conflicting National Standard (dow): 30 September 2012
ETSI
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SIST EN 300 132-2 V2.4.6:2012
6 ETSI EN 300 132-2 V2.4.6 (2011-12)
1 Scope
The present document contains requirements and measurements methods for the physical interface that is situated
between the power supply system(s) and the power consuming telecommunications and datacom (ICT) equipment; this
point is called interface "A" as defined in clause 4.
The purpose of the present document is to use a power supply system with the same characteristics for all
telecommunications and datacom (ICT) equipment defined in the area of application:
- to facilitate inter working of different (types of) load units;
- to facilitate the standardization of telecommunications and datacom (ICT) equipment;
- to facilitate the installation, operation and maintenance in the same network of telecommunications and
datacom (ICT) equipment and systems from different origins.
The present document aims at providing electrical compatibility between the power supply equipment and the power
consuming telecommunications and datacom (ICT) equipment, and also between different system blocks connected to
the same power supply.
The requirements are defined for:
- the output of the power supply equipment or power supply installation of telecommunications centres
providing power at the interface "A";
- the power supply input of any type of telecommunications and datacom (ICT) equipment installed at
telecommunication centres that are connected to interface "A" powered by DC;
- any type of telecommunications and datacom (ICT) equipment, installed in access networks and
customers' premises, the DC interface "A" of which is also used by equipment requiring a supply to the present
document.
- any type of telecommunication and datacom (ICT) equipment powered by DC, used in the fixed and mobile
networks installed in different locations as building, shelter, street cabinet.
Disturbances on the power supply interface "A" relating to the continuous wave phenomena below 20 kHz are covered
within the present document.
The present document does not cover safety requirements, they are covered by relevant safety standards.
The present document does not cover EMC requirements, they are covered by relevant EMC standards.
NOTE 1: The present document is applicable only to -48 V power supply interfaces. However, during a
DC
transitional period, other DC voltages may be used in existing installations. Annex B gives guidance on
working in conjunction with existing -60 V supply systems.
DC
NOTE 2: The DC voltage at interface "A" may be derived from the AC primary supply. The DC supply may
incorporate a backup battery
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) 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.
ETSI
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SIST EN 300 132-2 V2.4.6:2012
7 ETSI EN 300 132-2 V2.4.6 (2011-12)
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] CENELEC EN 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 O.41: "Psophometer for use on telephone-type circuits".
[5] CENELEC EN 61000-4-5: "Electromagnetic compatibility (EMC) - Part 4-5: Testing and
measurement techniques - Surge immunity test".
[6] IEC 60050-601: "International Electrotechnical Vocabulary. Chapter 601: Generation,
transmission and distribution of electricity - General" (Area 826 "Electrical installations",
section 826-11 "Voltages and currents").
[7] CENELEC EN 61000-4-29: "Electromagnetic compatibility (EMC) -Part 4-29: Testing and
measurement techniques -Voltage dips, short interruptions and voltage variations on d.c. input
power port immunity tests".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ITU-T Recommendation Q.551: "Transmission characteristics of digital exchanges".
[i.2] ITU-T Recommendation Q.552: "Transmission characteristics at 2-wire analogue interfaces of
digital exchanges".
[i.3] ITU-T Recommendation Q.553: "Transmission characteristics at 4-wire analogue interfaces of
digital exchanges".
[i.4] ITU-T Recommendation Q.554: "Transmission characteristics at digital interfaces of digital
exchanges".
[i.5] ETSI TR 100 283: "Environmental Engineering (EE); Transient voltages at Interface "A" on
telecommunications direct current (dc) power distributions".
[i.6] US Department of Defence MIL-STD-461E: "Requirements for the control of electromagnetic
interference characteristics of subsystems and equipment".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
abnormal service 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: configuration that corresponds to the maximum power consumption measured at -48 V
DC
with the equipment in operating conditions (e.g. not in standby mode)
ETSI
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SIST EN 300 132-2 V2.4.6:2012
8 ETSI EN 300 132-2 V2.4.6 (2011-12)
NOTE: When there are several fully equipped configurations because of different combinations of possible
boards, the configuration with the boards that gives the highest power consumption shall be considered.
interface "A": terminals at which the power supply is connected to the system block
NOTE 1: See also figure 1 and annex A.
NOTE 2: This is a functional definition and not an exact depiction of the physical location.
malfunction: termination of the normal service
maximum steady state input current (Im): maximum steady state input current, stated by the manufacturer, for a
fully equipped equipment under test connected to interface "A" at nominal voltage
nominal voltage: value of the voltage by which the electrical installation or part of the electrical installation is
designated and identified [6]
normal operating voltage range: voltage range at interface "A" where the system operates most of the time, e.g. in
general linked to battery floating voltage
normal service: service mode where telecommunications and datacom (ICT) equipment operates within its
specification which includes a defined restart time after malfunction or full interruption
normal service voltage range: range of steady-state voltages over which the equipment will maintain normal service
operating voltage: value of the voltage under normal conditions, at a given instant and a given point of the system [6]
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 A.
telecommunication centre: location where telecommunications and datacom (ICT) equipment is installed and which is
the sole responsibility of the operator
telecommunications and datacom equipment: Information and Communication Technology equipment (ICT)
3.2 Symbols
For the purposes of the present document, the following symbols apply:
I instantaneous inrush current
t
I maximum steady state input current
m
L inductance of inductive element of LISN
R resistance of resistive element of LISN
t time
Z capacitive impedance of immunity measurement circuit
c
Z resistive impedance of immunity measurement circuit
m
μs microsecond
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Alternating Current
DC Direct Current
NOTE: Also when used as a suffix to units of measurement.
EMC ElectroMagnetic Compatibility
ETSI
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SIST EN 300 132-2 V2.4.6:2012
9 ETSI EN 300 132-2 V2.4.6 (2011-12)
EUT Equipment Under Test
HOD High-Ohmic Distributions
ICT Information and Communication Technology
LISN Line Impedance Stabilization Network
LOD Low-Ohmic Distributions
RF Radio Frequency
rms root mean square
NOTE: Also when used as a suffix to units of measurement.
4 Requirements
The power supply interface, interface "A" of figure 1, is a physical point to which all the requirements are related.
This point is situated between the power supply system(s) and the power consuming telecommunications and datacom
(ICT) equipment.
An example of a configuration in which interface "A" is identified is given in annex A.
Figure 1: Identification of interface "A"
4.1 Nominal voltage
The interface and equipment shall be designated and identified by a nominal voltage.
The nominal voltage at interface "A" shall be -48 V (positive conductor is connected to earth as defined in
DC
EN 300 253 [3]).
NOTE: In most cases the nominal voltage of interface "A" is based on a 24 cell lead-acid battery.
4.2 Normal service voltage range at interface "A"
The normal service voltage range for the -48 V nominal supply at interface "A" shall be -40,5 V to -57,0 V .
DC DC DC
There shall be no degradation of service performance when telecommunication and datacom (ICT) equipment is
operating at voltages within the normal service voltage range.
This requirement shall be verified by applying the following tests at interface "A".
ETSI
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SIST EN 300 132-2 V2.4.6:2012
10 ETSI EN 300 132-2 V2.4.6 (2011-12)
The testing and measurement techniques are described in EN 61000-4-29 [7].
Table 1
Test level of Normal Duration Basic standard Rise and fall time of Performance criteria
service voltage variation voltage change
From -40,5 V to -57,0 V 0,1 s EN 61000-4-29 [7]
Between 1 μs and 50 μs on No degradation in the
From -57,0 V to -40,5 V 0,1 s service performance
100 Ω resistive load
during and after the
(see basic standard for test
generator) test
In the case of telecommunication and datacom (ICT) equipment with power supply input redundancies (e.g. power
supply 1"PS1" and power supply 2 "PS2"), this test shall be performed at each power supply input at a time with and
without the second power supply.
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: The operator can ask the manufacturer of telecommunications and datacom (ICT) equipment for any test
made at nominal voltage -48 V to be repeated at the most common operating voltage within the normal
operating voltage range e.g. -54,5 V for power consumption test.
4.3 Abnormal service voltage range at interface "A"
4.3.1 Abnormal service voltage range under steady state conditions
Telecommunications equipment operated at -48 V shall not suffer any damage when subjected to the following
DC
voltage ranges:
Table 2
0,0 V to -40,5 V and
DC DC
-57,0 V to -60,0 V
DC DC
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 normal service. The telecommunications and datacom (ICT)
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.
4.3.2 Abnormal conditions: voltage variations, dips and short interruptions
Telecommunication equipment shall not suffer any damage when subject to the following abnormal voltage range that
can be present at the interface "A".
Table 3
Voltage variation Duration Basic standard Rise and fall time of Performance criteria
voltage change
From -40,5 V to -60,0 V 0,1 s EN 61000-4-29 [7] Between 1 μs and Self restart to a normal
and from -60 V to -40,5 V service of the
50 μs on 100 Ω
equipment without
From -57,0 V to 0,0 V 0,1 s
resistive load (see
and from 0,0 V to -57,0 V operator intervention
basic standard)
after the test
ETSI
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SIST EN 300 132-2 V2.4.6:2012
11 ETSI EN 300 132-2 V2.4.6 (2011-12)
In the case of telecommunication and datacom (ICT) equipment with power supply input redundancies (e.g. power
supply 1 and power supply 2), this test shall be performed at each power supply input at a time with and without the
second power supply.
4.3.3 Voltage transients
4.3.3.1 Voltage transient due to short-circuit and protective device clearance
Voltage transients may occur at interface "A" when faults (e.g. short circuits) occur in the power distribution system.
These transients are characterized by a voltage drop in the range: 0 V to -40,5 V , followed by an overvoltage often
DC DC
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".
NOTE: TR 100 283 [i.5] provides guidance for the protection of telecommunications equipment from the
transients.
4.3.3.2 Short voltage transient due to switching and lightning
The surge immunity performance of telecommunications and datacom (ICT) equipment against abnormal overvoltage
shall be verified using the test procedure described below and the combination wave generator defined in the standard
EN 61000-4-5 [5]. This generator can produce the pulse shape of 1,2 μs-rise time/50 μs-duration in open circuit and
8 μs-rise time/20 μs-duration in short circuit.
Tests with positive of power supply connected to ground shall be performed with the operating input voltage of -54 V
accordingly with the following test specification.
Table 4
Transient Pulse Coupling Number of Pulse shape Performance criteria Comments
level and polarity lines pulses and
test class impedance
500 V surge Between Telecommunications The 0 V reference of
1,2 μs-rise
(class 1) positive and equipment operated the generator shall
Negative 5 time/50
negative within the normal be connected to the
μs-duration
power service voltage range positive pole of the
supply shall not be damaged power supply
2 Ω
poles
impedance
Self restart to a normal
service of the
equipment without
operator intervention
after the test
Telecommunications and datacom (ICT) equipment with power supply input redundancies (e.g. power supply 1 and
power supply 2) shall be tested applying the overvoltage at each power supply input at a time without the second power
supply.
NOTE: In a -48 Vdc system having the positive pole connected to earth , only the negative polarity of the voltage
transient following the clearance of an overcurrent protection device during a short-circuit condition is
relevant.
4.3.4 Recovery from voltage transients
After the occurrence of a voltage transient, as described in clause 4.3.3, telecommunications equipment shall continue
to function within its operational specification without requiring manual intervention.
In case of telecommunications and datacom (ICT) equipment with power supply input redundancies (e.g. power
supply 1 and power supply 2), this test shall be performed at each power supply input at a time with and without t
...
SLOVENSKI STANDARD
oSIST prEN 300 132-2 V2.3.6:2011
01-maj-2011
Okoljski inženiring (EE) - Napajalni vmesnik na vhodu v telekomunikacijsko in
podatkovno-komunikacijsko opremo - 2. del: Obratovanje z enosmerno napetostjo
-48 V (dc)
Environmental Engineering (EE) - Power supply interface at the input to
telecommunications and datacom (ICT) equipment - Part 2: Operated by -48 V direct
current (dc)
Ta slovenski standard je istoveten z: EN 300 132-2 Version 2.3.6
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
oSIST prEN 300 132-2 V2.3.6:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN 300 132-2 V2.3.6:2011
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oSIST prEN 300 132-2 V2.3.6:2011
Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
European Standard
Environmental Engineering (EE);
Power supply interface at the input to
telecommunications and datacom (ICT) equipment;
Part 2: Operated by -48 V direct current (dc)
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oSIST prEN 300 132-2 V2.3.6:2011
2 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
Reference
REN/EE-02016
Keywords
interface, power supply
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oSIST prEN 300 132-2 V2.3.6:2011
3 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
Contents
Intellectual Property Rights . 5
Foreword . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 7
2.2 Informative references . 7
3 Definitions, symbols and abbreviations . 7
3.1 Definitions . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
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 range under steady state conditions . 10
4.3.2 Abnormal conditions: voltage variations, dips and short interruptions . 10
4.3.3 Voltage transients . 11
4.3.3.1 Voltage transient due to short-circuit and protective device clearance . 11
4.3.3.2 Short voltage transient due to switching and lightning . 11
4.3.4 Recovery from voltage transients . 11
4.4 Voltage changes due to the regulation of the power supply . 12
4.5 Power supply protection at interface "A" . 12
4.6 Maximum current drain . 12
4.7 Inrush Current on connection of interface "A" . 13
4.7.1 Limits . 13
4.7.2 Measurements . 14
4.8 Conducted immunity requirements of the telecommunications equipment at interface "A": narrowband
noise . 15
4.9 Conducted emissions requirements of the telecommunications and datacom (ICT) equipment at
interface "A" . 17
5 Earthing and bonding . 18
Annex A (normative): Identification of interface "A" . 19
Annex B (informative): -60 V systems . 20
DC
Annex C (informative): Guide for measuring inrush current and for transferring the
recorded pulses onto the limit chart . 21
C.1 Measurement . 21
C.2 Pulse waveform transfor mation . 21
C.3 Measurement of inrush current with filter capacitor current pulses . 24
Annex D (informative): Test arrangements for the injection of electrical noise at interface
"A" . 27
Annex E (informative): Wideband noise . 28
E.1 Emission of wideband noise . 28
E.1.1 Assessment of wideband noise . 28
E.2 How to calculate wideband emission . 28
Annex F (informative): Protection dimensioning . 32
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
4 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
Annex G (informative): Effects of protective device operation transients in the power
distribution . 33
Annex H (informative): Bibliography . 34
History . 35
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
5 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
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 (EN) has been produced by ETSI Technical Committee Environmental Engineering (EE), and
is now submitted for the Public Enquiry phase of the ETSI standards Two-step Approval Procedure.
The present document concerns the requirements for the interface between telecommunications / datacom (ICT)
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 and datacom (ICT) equipment, as identified below:
Part 1: "Operated by alternating current (ac) derived from direct current (dc) sources";
Part 2: "Operated by 48 V direct current (dc)";
Part 3: "Operated by rectified current source, alternating current source or direct current source up to 400 V".
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
6 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
1 Scope
The present document contains requirements and measurements methods for the physical interface that is situated
between the power supply system(s) and the power consuming telecommunications and datacom (ICT) equipment; this
point is called interface "A" as defined in clause 4.
The purpose of the present document is to use a power supply system with the same characteristics for all
telecommunications and datacom (ICT) equipment defined in the area of application:
- to facilitate inter working of different (types of) load units;
- to facilitate the standardization of telecommunications and datacom (ICT) equipment;
- to facilitate the installation, operation and maintenance in the same network of Telecommunications and
datacom (ICT) equipment and systems from different origins.
The present document aims at providing electrical compatibility between the power supply equipment and the power
consuming telecommunications and datacom (ICT) equipment, and also between different system blocks connected to
the same power supply.
The requirements are defined for:
- the output of the power supply equipment or power supply installation of telecommunications centres
providing power at the interface "A";
- the power supply input of any type of telecommunications and datacom (ICT) equipment installed at
telecommunication centres that are connected to interface "A" powered by DC;
- Any type of telecommunications and datacom (ICT) equipment, installed in access networks and
customers' premises, the DC interface "A" of which is also used by equipment requiring a supply to this
specification.
- Any type of telecommunication and datacom (ICT) equipment powered by DC, used in the fixed and mobile
networks installed in different locations as building, shelter, street cabinet.
Disturbances on the power supply interface "A" relating to the continuous wave phenomena below 20 kHz are covered
within the present document.
The present document does not cover safety requirements, they are covered by relevant safety standards.
The present document does not cover EMC requirements, they are covered by relevant EMC standards.
NOTE 1: The present document is applicable only to -48 V power supply interfaces. However, during a
DC
transitional period, other DC voltages may be used in existing installations. Annex B gives guidance on
working in conjunction with existing -60 V supply systems.
DC
NOTE 2: The DC voltage at interface "A" may be derived from the AC primary supply. The DC supply may
incorporate a backup battery
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) 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.
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
7 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] CENELEC EN 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 O.41: "Psophometer for use on telephone-type circuits".
[5] CENELEC EN 61000-4-5: "Electromagnetic compatibility (EMC) - Part 4-5: Testing and
measurement techniques - Surge immunity test".
[6] IEC 60050-601: " International Electrotechnical Vocabulary. Chapter 601: Generation,
transmission and distribution of electricity - General" (Area 826 "Electrical installations",
section 826-11 "Voltages and currents").
[7] CENELEC EN 61000-4-29: Electromagnetic compatibility (EMC) -Part 4-29: Testing and
measurement techniques -Voltage dips, short interruptions and voltage variations on d.c. input
power port immunity tests.
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ITU-T Recommendation Q.551: "Transmission characteristics of digital exchanges".
[i.2] ITU-T Recommendation Q.552: "Transmission characteristics at 2-wire analogue interfaces of
digital exchanges".
[i.3] ITU-T Recommendation Q.553: "Transmission characteristics at 4-wire analogue interfaces of
digital exchanges".
[i.4] ITU-T Recommendation Q.554: "Transmission characteristics at digital interfaces of digital
exchanges".
[i.5] ETSI TR 100 283: "Equipment Engineering (EE); Transient voltages at interface "A" on
telecommunications direct current (dc) power distributions".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
abnormal service 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: this is the configuration that corresponds to the maximum power consumption measured at
-48 V with the equipment in operating conditions (e.g. not in standby mode)
DC
NOTE: When there are several fully equipped configurations because of different combinations of possible
boards, the configuration with the boards that gives the highest power consumption shall be considered.
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
8 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
interface "A": terminals at which the power supply is connected to the system block
NOTE 1: See also figure 1 and annex A.
NOTE 2: This is a functional definition and not an exact depiction of the physical location.
malfunction: termination of the normal service
maximum steady state input current (Im): maximum steady state input current, stated by the manufacturer, for a
fully-equipped equipment under test connected to interface "A" at nominal voltage
nominal voltage: value of the voltage by which the electrical installation or part of the electrical installation is
designated and identified [6]
normal service: service mode where telecommunications equipment operates within its specification which includes a
defined restart time after malfunction or full interruption.
normal service voltage range: range of steady-state voltages over which the equipment will maintain normal service
normal operating voltage range: voltage range at interface "A" where the system operates most of the time, e.g. in
general linked to battery floating voltage
operating voltage: value of the voltage under normal conditions, at a given instant and a given point of the system [6]
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 A.
telecommunication centre: location where telecommunications equipment is installed and which is the sole
responsibility of the operator
telecommunications and datacom equipment: Information and Communication Technology equipment (ICT)
3.2 Symbols
For the purposes of the present document, the following symbols apply:
I instantaneous inrush current
t
I maximum steady state input current
m
L inductance of inductive element of LISN
R resistance of resistive element of LISN
t time
Z capacitive impedance of immunity measurement circuit
c
Z resistive impedance of immunity measurement circuit
m
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AC Alternating Current
DC Direct Current
NOTE: Also when used as a suffix to units of measurement.
EMC ElectroMagnetic Compatibility
EUT Equipment Under Test
HOD High-Ohmic Distributions
ICT Information Communication Technology
LISN Line Impedance Stabilization Network
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
9 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
LOD Low-Ohmic Distributions
RF Radio Frequency
rms root mean square
NOTE: Also when used as a suffix to units of measurement.
4 Requirements
The power supply interface, interface "A" of figure 1, is a physical point to which all the requirements are related.
This point is situated between the power supply system(s) and the power consuming telecommunications and datacom
(ICT) equipment.
An example of a configuration in which interface "A" is identified is given in annex A.
telecommunications
equipment
DC power supply conductors
System block
Interface "A"
Figure 1: Identification of interface "A"
4.1 Nominal voltage
The interface and equipment shall be designated and identified by a nominal voltage.
The nominal voltage at interface "A" shall be -48 V (positive conductor is connected to earth as defined in
DC
EN 300 253 [3]).
NOTE: In most cases the nominal voltage of interface "A" is based on a 24 cell lead-acid battery.
4.2 Normal service voltage range at interface "A"
The normal service voltage range for the -48 V nominal supply at interface "A" shall be -40,5 V to -57,0 V .
DC DC DC
There shall be no degradation of service performance when telecommunication and datacom (ICT) equipment is
operating at voltages within the normal service voltage range.
This requirement shall be verified by applying the following tests at interface "A".
The testing and measurement techniques are described in EN 61000-4-29 [7].
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
10 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
Table 1
Test level of Normal Duration Basic standard Rise and fall time of Performance criteria
service voltage variation voltage change
No degradation in the
Between 1 μs and 50 μs on
From -40,5 V to -57,0 V 0,1 sec EN 61000-4-29 [7] service performance
100 Ω resistive load
(see basic standard) during and after the
test
From -57,0 V to -40,5 V
In the case of telecommunication and datacom (ICT) equipment with power supply input redundancies (e.g. power
supply 1"PS1" and power supply 2 "PS2"), this test shall be performed at each power supply input at a time with and
without the second power supply.
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: The operator can ask the manufacturer of telecommunications and datacom (ICT) equipment for any test
made at nominal voltage -48 V to be repeated at the most common operating voltage within the normal
operating voltage range e.g. -54,5 V for power consumption test.
4.3 Abnormal service voltage range at interface "A"
4.3.1 Abnormal service voltage range under steady state conditions
Telecommunications equipment operated at -48 V shall not suffer any damage when subjected to the following
DC
voltage ranges:
Table 2
0,0 V to -40,5 V and
DC DC
-57,0 V -60,0 V
to
DC DC
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 normal service. The telecommunications and datacom (ICT)
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.
4.3.2 Abnormal conditions: voltage variations, dips and short interruptions
Telecommunication equipment shall not suffer any damage when subject to the following abnormal voltage range that
can be present at the interface "A".
Table 3
Voltage variation Duration Basic standard Rise and fall time of Performance criteria
voltage change
From -40,5 V to -60,0 V Self restart to a normal
Between 1 μs and
and from -60 V to -40,5 V service of the
50 μs on 100 Ω
From -57,0 V to 0,0 V 0,1 sec EN 61000-4-29 [7] equipment without
resistive load (see
operator intervention
and from 0,0 V to -57,0 V basic standard)
after the test
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
11 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
In the case of telecommunication and datacom (ICT) equipment with power supply input redundancies (e.g. power
supply 1 and power supply 2), this test shall be performed at each power supply input at a time with and without the
second power supply.
4.3.3 Voltage transients
4.3.3.1 Voltage transient due to short-circuit and protective device clearance
Voltage transients may occur at interface "A" when faults (e.g. short circuits) occur in the power distribution system.
These transients are characterized by a voltage drop in the range: 0 V to -40,5 V , followed by an overvoltage often
DC DC
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".
NOTE: TR 100 283 [i.5] provides guidance for the protection of telecommunications equipment from the
transients.
4.3.3.2 Short voltage transient due to switching and lightning
The surge immunity performance of telecommunications and datacom (ICT) equipment against abnormal overvoltage
shall be verified using the test procedure described below and the combination wave generator defined in the standard
EN 61000-4-5 [5]. This generator can produce the pulse shape of 1,2 μs-rise time/50 μs-duration in open circuit and
8 μs-rise time/20 μs-duration in short circuit.
Tests with positive of power supply connected to ground shall be performed with the operating input voltage of
-54 V accordingly with the following test specification.
Table 4
Transient Pulse Coupling Number of Pulse shape Performance criteria Comments
level and polarity lines pulses and
test class impedance
The 0 V reference of
1,2 μs-rise
Between Telecommunications the generator shall
time/50
500 V surge positive and equipment operated be connected to the
μs-duration
(class 1) negative within the normal positive pole of the
power service voltage range power supply
2 Ω
Negative 5
supply shall not be damaged
impedance
poles
Self restart to a normal
service of the
equipment without
operator intervention
after the test
Telecommunications and datacom (ICT) equipment with power supply input redundancies (e.g. power supply 1 and
power supply 2) shall be tested applying the overvoltage at each power supply input at a time without the second power
supply.
NOTE: In a -48 Vdc system having the positive pole connected to earth , only the negative polarity of the voltage
transient following the clearance of an overcurrent protection device during a short-circuit condition is
relevant.
4.3.4 Recovery from voltage transients
After the occurrence of a voltage transient, as described in clause 4.3.3, telecommunications equipment shall continue
to function within its operational specification without requiring manual intervention.
In case of telecommunications and datacom (ICT) equipment with power supply input redundancies (e.g. power supply
1 and power supply 2), this test shall be performed at each power supply input at a time with and without the second
power supply.
ETSI
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oSIST prEN 300 132-2 V2.3.6:2011
12 Draft ETSI EN 300 132-2 V2.3.6 (2011-02)
NOTE 1: The abnormal service should not lead to the disconnection of ICT equipment power supply units e.g. by
causing circuit breakers, fuses and other such de
...
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