ETSI EN 302 099 V1.1.1 (2002-01)

Environmental Engineering (EE); Powering of equipment in access network

DEN/EE-02007

Okoljski inženiring (EE) – Napajanje opreme v dostopovnem omrežju

General Information

• Status: Published
• Publication Date: 27-Jan-2002
• Technical Committee: EE 2 - EE Power Supply
• Current Stage: 12 - Completion
• Due Date: 15-Feb-2002
• Completion Date: 28-Jan-2002
• Ref Project: SIST EN 302 099 V1.1.1:2006 - Environmental Engineering (EE); Powering of equipment in access network

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 302 099 V1.1.1:2006
01-februar-2006
Okoljski inženiring (EE) – Napajanje opreme v dostopovnem omrežju
Environmental Engineering (EE); Powering of equipment in access network
Ta slovenski standard je istoveten z: EN 302 099 Version 1.1.1
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 302 099 V1.1.1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 302 099 V1.1.1:2006

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SIST EN 302 099 V1.1.1:2006

ETSI EN 302 099 V1.1.1 (2002-01)
European Standard (Telecommunications series)


Environmental Engineering (EE);
Powering of equipment in access network

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SIST EN 302 099 V1.1.1:2006
 2 ETSI EN 302 099 V1.1.1 (2002-01)



Reference
DEN/EE-02007
Keywords
access, network
ETSI
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© European Telecommunications Standards Institute 2002.
All rights reserved.

ETSI

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SIST EN 302 099 V1.1.1:2006
 3 ETSI EN 302 099 V1.1.1 (2002-01)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope.5
2 References.5
3 Definitions and abbreviations.6
3.1 Definitions.6
3.2 Abbreviations.7
4 Powering configurations.7
4.1 Remote powering.8
4.1.1 Centralized powering.8
4.1.2 Cluster powering.9
4.2 Local powering.10
4.2.1 TE of access network, common to several customers.10
4.2.2 TE of access network, at customer's home .10
5 Effect of the technologies on the powering strategy .11
5.1 Powering strategy of family 1: metallic links.12
5.2 Powering strategy of family 2: non-metallic links .12
6 Requirements for local powering .13
6.1 TE including the power plant .13
6.2 TE powered by a dc voltage nominal -48 V local power unit .13
6.3 TE powered by a LPU with a dc voltage other than -48 V.13
6.4 TE powered by a nominal ac voltage nominal of 230 V, 50 Hz local power unit.13
7 Requirements for remote powering.13
7.1 Input of the Remote Power Unit.13
7.2 Output of the Remote Power Unit .13
7.3 Input characteristics of remote powered receiver in the voltage mode .14
7.4 Input characteristics of remote powered receiver in the current mode.14
8 Power back-up.14
9 Power management.14
10 Safety, EMC, protection.16
10.1 Product Safety.16
10.2 EMC.16
10.3 Protection/resistibility.16
10.4 Bonding and earthing .16
11 Environmental conditions.17
Annex A (normative): Battery sizing.18
A.1 Back-up power for telephone service.18
A.2 Autonomy of the back-up.18
A.3 Use of valve regulated lead acid battery.19
A.4 End of service life of battery .19
Annex B (informative): Bibliography.20
History .21

ETSI

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SIST EN 302 099 V1.1.1:2006
 4 ETSI EN 302 099 V1.1.1 (2002-01)
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).

National transposition dates
Date of adoption of this EN: 25 January 2002
Date of latest announcement of this EN (doa): 30 April 2002
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 October 2002
Date of withdrawal of any conflicting National Standard (dow): 31 October 2002

ETSI

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SIST EN 302 099 V1.1.1:2006
 5 ETSI EN 302 099 V1.1.1 (2002-01)
1 Scope
The present document describes the principles for powering of telecommunications equipment in access network and
contains requirements for the powering systems, laying down:
- the characteristics of the input and output interfaces of the power units;
- the power back-up conditions for TE including a power unit;
- the management data, necessary to guarantee the availability of the service and to ensure the maintenance of the
power units.
The present document takes into account the characteristics of access network equipment for which the limits of
responsibility in the installation or design of the power plants are very different than for equipment of telecom centre: it
goes from "complete integration of the power plant in the TE" till "remote power feeding from a distant power plant".
The present document applies for the powering of all equipment of the access network (copper, fiber or radio networks)
located outside telecommunications centres. The access network is defined as the part of the telecommunications
network, which is comprised between the customer terminal installation and the first exchange (switching unit). The
customer terminal and the switching unit are excluded of the application field of the present document.
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.
[1] ETSI ETS 300 132-1: "Equipment Engineering (EE); Power supply interface at the input to
telecommunications equipment; Part 1: Operated by alternating current (ac) derived from direct
current (dc) sources".
[2] ETSI EN 300 132-2: "Environmental Engineering (EE); Power supply interface at the input to
telecommunications equipment; Part 2: Operated by direct current (dc)".
[3] Void.
[4] CENELEC EN 60950-1: "Information technology equipment - Safety - Part 1: General
requirements".
[5] IEC 60950-21: "Safety of information technology equipment - Part 21: Remote power feeding".
[6] CENELEC HD 472 S1 (1989): "Nominal voltages for low-voltage public electricity supply
systems".
[7] CENELEC HD 625.1: "Insulation coordination for equipment within low-voltage systems -
Part 1: Principles requirements and tests".
[8] CENELEC EN 50310: "Application of equipotential bonding and earthing in buildings with
information technology equipment".
[9] CENELEC EN 60896-2: "Stationary lead-acid batteries - General requirements and method of
test - Part 2: Valve regulated types".
[10] ETSI EN 300 019-1-1: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-1: Classification of environmental
conditions; Storage".
ETSI

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SIST EN 302 099 V1.1.1:2006
 6 ETSI EN 302 099 V1.1.1 (2002-01)
[11] ETSI EN 300 019-1-3: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-3: Classification of environmental
conditions; Stationary use at weatherprotected locations".
[12] ETSI ETS 300 019-1-4: "Equipment Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-4: Classification of environmental
conditions; Stationary use at non-weatherprotected locations".
[13] ETSI EN 300 019-1-8: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1-8: Classification of environmental
conditions; Stationary use at underground locations".
[14] ETSI EN 300 253: "Environmental Engineering (EE); Earthing and bonding configuration inside
telecommunications centres".
[15] ITU-T Recommendation K.35: "Bonding configurations and earthing at remote electronic sites".
[16] ETSI EG 201 212: "Electrical safety; Classification of interfaces for equipment to be connected to
telecommunication networks".
[17] ITU-T Recommendation K.45: "Resistibility of access network equipment to overvoltages and
overcurrents".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document the following terms and definitions apply:
access network: part of a telecommunications network between the customer terminal installation and the first
switching unit
local powering: powering principle of a telecommunications equipment by a (dedicated) power unit implemented in the
same location
remote powering: power feeding of a telecommunications equipment by a remote power circuit
NOTE: Such a circuit consists of a remote power unit, distribution wiring, and fed receivers.
Remote Feeding Telecommunication (RFT) circuit: secondary circuit within the equipment, intended to supply or
receive dc power via a telecommunication network at voltages equal to or exceeding the limits for TNV circuits, and on
which overvoltages from telecommunication networks are possible
RFT-C circuit: RFT circuit which is so designed and protected that under normal operating conditions and single fault
conditions the currents in the circuit do not exceed defined values
RFT-V circuit: RFT circuit which is so designed and protected that under normal operating conditions and single fault
conditions the voltages are limited and the accessible area of contact is limited
centralized powering: remote powering in which the remote feeding source is located in a telecommunications centre
cluster powering: remote powering of a cluster of equipment (1 to n items of equipment), in which the remote feeding
source is located outside a telecommunications centre
Remote Power Unit (RPU): power unit, connected to the mains or from a centralized power plant, which supplies
distant telecommunications equipment
distant power receiver: power equipment electrically connected to a Remote Power Unit
NOTE: Its function is to supply telecommunications equipment situated at the same location. It may be combined
with the item of telecommunications equipment itself.
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SIST EN 302 099 V1.1.1:2006
 7 ETSI EN 302 099 V1.1.1 (2002-01)
Local Power Unit (LPU): power supply equipment whose function is to supply a telecommunication equipment
situated at the same location
NOTE: It is generally locally connected to the mains and provides dc or ac voltage output to feed
telecommunication equipment.
SELV circuit: See EN 60950-1 [4].
TNV circuit: See EN 60950-1 [4].
hazardous voltage: See EN 60950-1 [4].
primary circuit: See EN 60950-1 [4].
secondary circuit: See EN 60950-1 [4].
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ac alternating current
CH Customer's Home
dc direct current
FTTB Fibre To The Building
FTTC Fibre To The Curb
FTTCab Fibre To The Cabinet
FTTH Fibre To The Home
LPU Local Power Unit
ONU Optical Network Unit
RFT Remote Feeding Telecommunication
RPU Remote Power Unit
TC Telecommunication's Centre
TE Telecom Equipment
TNV Telecommunication Network Voltage
UPS Uninterruptible Power Supply
4 Powering configurations
The main characteristic feature of the different powering architectures of access network equipment is the location of
the following two functions:
- the point of connection to the mains; and
- the place of power back-up.
The total network can be divided in three main parts:
1) the Telecommunication Centre (TC);
2) the field (the undefined area between the Telecom Centre and the Customer's Home);
3) the Customer's Home (CH).
Powering architectures
Equipment of access network can be powered remotely from a telecommunications centre (centralized powering) or
from a power supply node (cluster powering), or locally from the mains (local powering). Inside these three main
powering architectures, several configurations of powering are used. They are summarized in the clauses 4.1 to 4.2 and
in the figures 1, 2 and 3 by the acronyms PW1 to PW 9 (for powering).
ETSI

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SIST EN 302 099 V1.1.1:2006
 8 ETSI EN 302 099 V1.1.1 (2002-01)
Power back-up
For the telephone service, which needs to provide an available service even in the case of a mains outage, a power
back-up unit is located either in the remote power source or in the equipment powered. The clauses 4.1 to 4.2 detail the
different installation configurations.
Location of the Telecom Equipment (TE)
On the figures 1, 2 and 3 of the following clauses, the TE in access network is schematically represented in the field.
These figures mean that the TE can be implemented in different types of locations:
- in a customer's office;
- in a building, public or private;
- in an indoor cabinet;
- in a street cabinet;
- on a pole cabinet;
- in a telecommunications manhole, etc.
The TE provides services for several customers or for one professional customer.
On figure 3, the TE can be located at customer's home and provides services for only one private customer.
Power interfaces
Six power-feeding interfaces are mentioned in the following clauses: They are as follows:
I = Power interface between a -48 V power plant and the fed equipment in a telecom centre. It fits with the
0
interface "A" according to EN 300 132-2 [2].
I = Power interface between the public mains (commercial ac) and the fed equipment. It fits with the voltage
1
defined in HD 472 [6].
I = Power interface at the output of a remote power source.
2
I = Power interface at the input of a distant power receiver interface, in remote powering.
3
I = Power interface between a local power unit and the fed equipment, in local powering. It fits with the interface
4
"A" according to EN 300 132-2 [2] or with the interface defined in clauses 6.2 to 6.4.
I = Power interface between the public mains (commercial ac) or emergency power (UPS, diesel generator) or
5
interface "A" according to ETS 300 132-1 [1] and the fed equipment in a telecom centre. It fits with the
voltage defined in HD 472 [6].
4.1 Remote powering
4.1.1 Centralized powering
The different power supply configurations are detailed in figure 1. The output of the power source is defined at interface
I . It comes from a TE (PW1a) or from a specific remote power unit (RPU in PW1b). Interface I corresponds to the
2 0
input of the RPU. The remote power unit consists of protection and distribution devices and, possibly, power
conversion equipment. Interface I corresponds to Interface I and is located in the telecommunication centre.
5 1
In some cases, the TE of the access network may be equipped with a battery providing additional power in periods of
heavy traffic (PW3). This battery is recharged by the remote power supply during periods of light traffic.
ETSI

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SIST EN 302 099 V1.1.1:2006
 9 ETSI EN 302 099 V1.1.1 (2002-01)
Customer
0
terminal
2
3
TE
   TE
PW1a
0
3
2
Remote
TE PW1b
Power
Unit
5
33
2
Central
TE TE PW2a
Power
Supply
5
2
33
Remote
TE
PW2b
Power
Unit
2 3
TE
PW3
Ad
Customer's
Access network equipment
Telecommunications centre
home
Additional power source (for traffic)
Ad

Figure 1: Centralized powering
4.1.2 Cluster powering
The different possible power supply configurations are detailed in figure 2. The remote power source, called Remote
Power Unit (RPU), serves a group of distant telecommunications equipment, from 1 to n. The RPU is installed in a
location (building, outdoor cabinet, manhole, etc.) which is distinct from the TE's building, cabinet or manhole. The
telephone service is backed up by batteries located either at the remote power unit (remote powering with back-up at
source, PW4) or in the telecommunications equipment (remote powering with local back-up, PW5).
Customer
terminal
TE
Remote
PW4
Power
Unit
Telecom-
munications
centre
TE
PW5
Remote
Power
Unit
Customer's
Access network equipment
home

Figure 2: Cluster powering
ETSI

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SIST EN 302 099 V1.1.1:2006
 10 ETSI EN 302 099 V1.1.1 (2002-01)
4.2 Local powering
4.2.1 TE of access network, common to several customers
The different possible local power supply configurations are detailed in figure 3. They are the following two basic
types:
- the telecommunications equipment is powered (Interface I ) through a Local Power Unit (LPU in PW6)
4
providing the functions of protection, power conversion and back-up of telephone service. It is either housed in
the telecommunications equipment rack or installed in an independent mounting, but always in the same building
or location as the TE.
- the telecommunications equipment is powered directly from the mains at Interface I (PW7). It includes
1
protection devices, power conversion equipment and back-up blocks for telephone service.

Customer terminal
I I
1 4
PW6
  TE
Local
Power
Unit
I
1
TE
PW7
I I
1 4
PW8
TE
LPU
Telecom-
munications
centre
I
1
TE
PW9
Customer's home
Access network equipment

Figure 3: Local powering
4.2.2 TE of access network, at customer's home
The TE is located in a customer's home and provides services for a single private customer. Two types of power feeding
are defined in local powering architecture:
- the telecommunications equipment is powered (interface I ) through a Local Power Unit (PW8) which may
4
additionally provide backup;
- the telecommunications equipment provides usually back-up for telephone service when supplied by the mains
or by UPS (PW9).
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SIST EN 302 099 V1.1.1:2006
 11 ETSI EN 302 099 V1.1.1 (2002-01)
5 Effect of the technologies on the powering strategy
Access network involves different technologies such as copper, optical fiber or radio. Between the exchange and the
customer's terminal, the telecom network is achieved:
- either in one single technology (for instance "copper", for a big part of the present network or "optical fiber", for
a future FTTH network or radio link); or
- in a combination of technologies (hybrid networks: copper/radio network, optical/copper, optical/radio).
These access network systems can be divided in two main families (see figure 4) according to the links between the
telecom centre and the active equipment, and their consequences on powering:
- Family 1: system connected to a telecom centre by a metallic link. This family includes the copper access.
- Family 2: system connected to a telecom centre by a non-metallic link. This family includes the fiber access
network (FTTH), the hybrid fiber/copper access network (FTTCab/FTTC/FTTB), the hybrid copper/radio access
network and the radio access network.
Cu Cu Customer's
home
no metallic linkage
Cu
Copper Access Network Radio Access Network
Telecom-
munications
no metallic linkage
Cu
centre
Optical Access Network
(FTTC - FTTB)
Radio Access Network
Optical Access Network
Optical Access Network (FTTH)
or Radio Access Network
A
Active equipment

Figure 4: Access network technologies
ETSI

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SIST EN 302 099 V1.1.1:2006
 12 ETSI EN 302 099 V1.1.1 (2002-01)
5.1 Powering strategy of family 1: metallic links
The equipment of copper access network is generally powered according to the three principles defined as follows:
a) due to a metallic link from the telecom centre to the access network equipment, the centralized powering
(PW1a/PW1b and PW2a/PW2b in figure 1) can be used: remote power source with back-up in the central
office and power ducts by the (existing) copper pair(s). Such a solution can be developed if the power
consumption of the equipment is not too high. The output voltage of the power source is defined in
clause 7.2.
b) when the power consumption of the access network equipment is higher, a local powering has to be used.
Two configurations are defined:
- the power supply with back-up can be provided by a Local Power Unit (PW6 or PW8 in figure 3). The
telecom operator is the provider of the LPU and the requirements at the interface "LPU/Telecom system"
(I of figure 3) are defined in clauses 6.2 to 6.4.
4
- the power plant with back-up can also be included in the TE (PW7 or PW9 in figure 3). Clause 8 defines
the requirements for the power back-up i.e. the conditions for the definition of a back-up time.
c) for intermediate power consumption, the centralized powering can be completed by a local battery (PW3 in
figure 1) which provides an additional power source in operation (discharge) when the traffic increases.
During the most part of time, the traffic is such that the power provided by remote powering is sufficient and
the local battery is in charge. By daily cycles or occasionally, the local battery is used when the traffic
increases.
5.2 Powering strategy of family 2: non-metallic links
The equipment of the fiber access network, the radio access network, the hybrid fiber/copper access network, the hybrid
copper/radio access network and the hybrid fiber/radio access network are generally powered according to the three
principles defined as follows:
a) Since no "natural" electrical link connects the telecom centre to the Optical Network Unit (ONU), the local
powering is the recommended solution in FTTB particularly for professional applying. As it was defined in
clause 5.1 b), the power supply of the equipment can be provided either by a LPU (PW6 in figure 3) or directly
from the mains (PW8 in figure 3). In the first case, the requirements at the interface LPU/ONU are defined in
clauses 6.2 to 6.4. In the second case, the requirements for the power back-up are given in clause 8.
b) When a lot of ONUs are implemented in one area, it may be cost effective to centralize their power supply in a
RPU (located in the same area than the ONUs) as defined for cluster powering architecture (see clause 4.2). The
power feeding from the RPU to the ONUs is generally ensured by dedicated power cables. The requirements on
the output of the RPU are defined in clause 7.2.
The location of the battery for the power back-up of the telephone service can be either in the RPU (PW4 of
figure 2) or in the TE (PW5 of figure 2). In the second configuration, the requirements on power back-up are
given in clause 8.
c) In some cases, the ONUs may be supplied by means of a centralized powering architecture (PW1b of figure 1).
The requirements on the output of the RPU are defined in clause 7.2.
The powering of hybrid fiber/radio access network can obey to the same principles than those defined in hybrid
fiber/copper access network. The receiving equipment is a fixed part located at the customer's home. It is in any case
powered locally (PW9 in figure 3) from the mains.
The fiber access network is characterized by the optical architectures FTTH, FTTB and FTTC.
The powering of radio access network is the local powering. As it was defined in clause 5.1 b) the power supply of the
equipment can be provided directly from the mains (PW8 or PW9 in figure 3). In this cas
...