Equipment Engineering (EE); Power supply interface at the input to telecommunications equipment; Part 2: Operated by direct current (dc)

This European Telecommunication Standard (ETS) 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 buffer battery. This ETS also makes reference to safety and EMC standards which are in accordance with the relevant European standards. This ETS 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: To ensure satisfactory performance, the connection of telecommunications equipment into installations is subject to the prevailing conditions of that installation and is subject to the agreement of both parties.
NOTE 2: This ETS 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" 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 equipment.
NOTE 3: 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 4: 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 subclause 4.8.
NOTE 5: Disturbances on the power supply interface "A" relating to the continuous wave phenomena above 20 kHz is not covered within this ETS. ETS 300 386-1 [3] is applicable for this frequency range.
NOTE 6: The transients to which immunity is specified in this ETS are characterized by a high energy content such that electrical stress may be caused. Fast transients, the effects of which appear mainly as interference, are covered by ETS. ETS 300 386-1 [3] which details the electromagnetic compatibility of telecommunications equipment.
NOTE 7: An example of a configuration in which the interface "A" is identified is given in annex E.

Inženiring opreme (EE) – Napajalni vmesnik na vhodu v telekomunikacijsko opremo – 2. del: Obratovanje z enosmerno napetostjo (dc)

General Information

Status
Published
Publication Date
31-Jan-2006
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Feb-2006
Due Date
01-Feb-2006
Completion Date
01-Feb-2006

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SLOVENSKI STANDARD
SIST ETS 300 132-2 E1:2006
01-februar-2006
Inženiring opreme (EE) – Napajalni vmesnik na vhodu v telekomunikacijsko
opremo – 2. del: Obratovanje z enosmerno napetostjo (dc)

Equipment Engineering (EE); Power supply interface at the input to telecommunications

equipment; Part 2: Operated by direct current (dc)
Ta slovenski standard je istoveten z: ETS 300 132-2 Edition 1
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST ETS 300 132-2 E1:2006 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 132-2 E1:2006
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SIST ETS 300 132-2 E1:2006
EUROPEAN ETS 300 132-2
TELECOMMUNICATION September 1996
STANDARD
Source: ETSI TC-EE Reference: DE/EE-02001.2
ICS: 33.020
Key words: Power supply
Equipment Engineering (EE);
Power supply interface at the input to
telecommunications equipment;
Part 2: Operated by direct current (dc)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16

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 1996. All rights reserved.
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SIST ETS 300 132-2 E1:2006
Page 2
ETS 300 132-2: September 1996

Whilst 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 Committee Support Dept." at the address shown on the title page.

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SIST ETS 300 132-2 E1:2006
Page 3
ETS 300 132-2: September 1996
Contents

Foreword .......................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 Normative references..........................................................................................................................8

3 Definitions and abbreviations ..............................................................................................................9

3.1 Definitions ............................................................................................................................9

3.2 Abbreviations .......................................................................................................................9

4 Requirements....................................................................................................................................10

4.1 Nominal value of the supply voltage ..................................................................................10

4.2 Normal service voltage range at interface "A" ...................................................................10

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 Short duration voltage transients...................................................................10

4.3.4 Recovery from short duration voltage transients...........................................11

4.4 Voltage changes due to the regulation of the power supply ..............................................11

4.5 Supply protection at interface "A".......................................................................................11

4.6 Maximum current drain following abnormal service ..........................................................11

4.7 Surge current on connection of interface "A".....................................................................11

4.7.1 Limits.............................................................................................................11

4.7.2 Measurements...............................................................................................12

4.8 Conducted immunity requirements of the telecommunications equipment at

interface "A" .......................................................................................................................13

4.8.1 Immunity to narrowband noise ......................................................................13

4.8.2 Immunity to wideband noise..........................................................................14

4.9 Conducted emissions requirements of the telecommunications equipment at

interface "A" .......................................................................................................................15

4.9.1 Emissions of narrowband noise ....................................................................15

4.9.2 Emissions of wideband noise........................................................................16

5 Earthing and bonding ........................................................................................................................17

6 Electrical safety requirements ...........................................................................................................17

7 EMC requirements ............................................................................................................................17

Annex A (informative): 60 V systems ...................................................................................................18

Annex B (informative): Information and guide on safety .........................................................................19

Annex C (informative): Guide for measuring inrush current and for transferring the recorded pulses

onto the limit chart ..............................................................................................20

C.1 Measurement ....................................................................................................................................20

C.2 Pulse waveform transformation.........................................................................................................20

Annex D (informative): Test arrangements for the injection of electrical noise at interface "A" ..............22

Annex E (informative): Identification of interface "A"...............................................................................23

Annex F (informative): Bibliography........................................................................................................24

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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996

History......................................................................................................................................................... 25

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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996
Foreword

This European Telecommunication Standard (ETS) has been produced by the Equipment Engineering

(EE) Technical Committee of the European Telecommunications Standards Institute (ETSI).

This ETS concerns the requirements for the interface between telecommunications equipment and its

power supply, and includes requirements relating to its stability and measurement. References are also

made to the safety aspects, in various IEC and CENELEC documents which are normative to this ETS.

Various other references and detailed measurement and test arrangements are contained in informative

annexes.
This ETS consists of 2 parts as follows:

Part 1: "Operated by alternating current (ac) derived from direct current (dc) sources"

Part 2: "Operated by direct current (dc)"
Transposition dates
Date of adoption of this ETS: 16 August 1996
Date of latest announcement of this ETS (doa): 31 December 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 June 1997
Date of withdrawal of any conflicting National Standard (dow): 30 June 1997
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ETS 300 132-2: September 1996
Blank page
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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996
1 Scope
This European Telecommunication Standard (ETS) 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 buffer battery.

This ETS also makes reference to safety and EMC standards which are in accordance with the relevant

European standards.

This ETS 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: To ensure satisfactory performance, the connection of telecommunications equipment

into installations is subject to the prevailing conditions of that installation and is subject

to the agreement of both parties.

NOTE 2: This ETS is applicable only to -48 V 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 V supply systems.

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 equipment.

NOTE 3: 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 4: 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 subclause 4.8.

NOTE 5: Disturbances on the power supply interface "A" relating to the continuous wave

phenomena above 20 kHz is not covered within this ETS. ETS 300 386-1 [3] is
applicable for this frequency range.

NOTE 6: The transients to which immunity is specified in this ETS are characterized by a high

energy content such that electrical stress may be caused. Fast transients, the effects

of which appear mainly as interference, are covered by ETS. ETS 300 386-1 [3] which

details the electromagnetic compatibility of telecommunications equipment.

NOTE 7: An example of a configuration in which the interface "A" is identified is given in

annex E.
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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996
telecommunications
equipment
DC power supply conductors
system block
interface A
Figure 1: General identification of the power interface "A"
The purpose of this ETS is:

- to use a power supply system with the same characteristics for all telecommunications equipment

defined in the area of application;
- to facilitate interworking 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 Normative references

This ETS incorporates by dated and undated reference, provisions from other publications. These

normative references are cited at the appropriate places in the text and the publications are listed

hereafter. For dated references, subsequent amendments to or revisions of any of these publications

apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest

edition of the publication referred to applies.
[1] EN 60950: "Safety of information technology equipment, including electrical
business equipment".
[2] ETS 300 253: "Equipment Engineering (EE); Earthing and bonding of
telecommunication equipment in telecommunication centres".
[3] ETS 300 386-1 (1994): "Equipment Engineering (EE); Public telecommunication
network equipment; Electro-Magnetic Compatibility (EMC) requirements;
Part 1: Product family overview, compliance criteria and test levels".
[4] ITU-T Recommendation O.41: "Psophometer for use on telephone-type
circuits".
[5] ITU-T Recommendation Q.551: "Transmission characteristics of digital
exchanges".
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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996
[6] ITU-T Recommendation Q.552: "Transmission characteristics at 2-wire
analogue interfaces of digital exchange".
[7] ITU-T Recommendation Q.553: "Transmission characteristics at 4-wire
analogue interfaces of a digital exchange".
[8] ITU-T Recommendation Q.554: "Transmission characteristics at digital
interfaces of a digital exchange".

[9] IEC 364-4-41 (1982): "Electrical installations of buildings - Part 4: Protection for

safety - Chapter 41: Protection against electric shock".
[10] US Department of Defense MIL-STD-462: "Electromagnetic interference
characteristics, measurement of".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:

abnormal voltage range: The 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.

interface "A": The terminals at which the power supply is connected to the system block (see figure 1).

NOTE 1: 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.

nominal voltage value: The nominal value of the voltage that designates the type of supply.

normal service voltage range: The range of steady-state voltages over which the equipment will

maintain normal service.

normal service: The service mode where telecommunications equipment operates within its

specification.

power supply: A power source to which telecommunications equipment is intended to be connected.

system block: A functional group of equipment depending for its operation and performance on its

connection to the same power supply.

NOTE 2: A system block may consist of equipment or a functional group of equipment. Different

examples of configurations at interface "A" are given in annex E.

telecommunication centre: Any location where telecommunications equipment is installed and which is

the sole responsibility of the operator.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
dc direct current (also when used as a suffix to units of measurement)
EUT Equipment Under Test
I maximum current (see subclause 4.7.1)
I nominal current
nom
I instantaneous surge current (see subclause 4.7.1)
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SIST ETS 300 132-2 E1:2006
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ETS 300 132-2: September 1996
L inductance of inductive element of LISN
LISN Line Impedance Stabilization Network
... (subscripted letter following unit) psophometrically weighted
R resistance of resistive element of LISN
rms root mean square (also when used as a suffix to units of measurement)
t time
Z capacitive impedance of immunity measurement circuit
Z resistive impedance of immunity measurement circuit
4 Requirements
4.1 Nominal value of the supply voltage

The nominal value of the voltage at interface "A" shall be -48 V (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 V supply systems.
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 to -57,0 V .

dc dc
NOTE 1: The voltages specified are measured at interface "A". It should be n
...

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