ETSI EN 302 099 V2.3.0 (2026-09)

• Abstract:

  REN/EE-027017

• Status: Not Published
• Technical Committee: EE 2 - EE Power Supply
• Current Stage: 9 - Start of OAP
• Due Date: 17-Sep-2026
• Completion Date: 17-Sep-2026
• Ref Project: oSIST prEN 302 099 V2.3.0:2026 - Environmental Engineering (EE) - Powering of equipment in access network

Draft ETSI EN 302 099 V2.3.0 (2026-09)

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

2 Draft ETSI EN 302 099 V2.3.0 (2026-09)

Reference
REN/EE-027017
Keywords
access, network, power supply, remote
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ETSI
3 Draft ETSI EN 302 099 V2.3.0 (2026-09)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 9
3.1 Terms . 9
3.2 Symbols . 10
3.3 Abbreviations . 11
4 Introduction . 12
4.1 General . 12
5 Powering configurations. 12
5.0 General . 12
5.1 Remote powering architectures . 15
5.1.1 Centralized powering architecture configurations . 15
5.1.2 Cluster powering architecture configurations . 17
5.2 Local powering architecture configurations . 19
5.2.1 TE of access network, common to several customers . 19
5.2.2 TE of access network, at customer premises . 20
5.2.3 TE in access network reverse powered from customer premises . 21
5.2.3.1 Reference configuration introduction . 21
5.2.3.2 Wiring and electrical limitation consideration . 21
5.2.3.3 Reverse power, voltage and current limits . 21
6 Effect of the technologies on the powering strategy . 22
6.0 General . 22
6.1 Powering strategy of family 1: metallic links . 23
6.2 Powering strategy of family 2: non-metallic links . 24
7 Requirements for local powering . 24
7.1 TE including the power plant . 24
7.2 TE powered by a DC voltage nominal -48 VDC or up to 400 VDC local power unit . 24
7.3 TE powered by a LPU with a DC voltage other than -48 VDC or up to 400 VDC . 25
7.4 TE powered by a nominal AC voltage of 230 VAC, 50 Hz local power unit . 25
8 Requirements for remote powering . 25
8.0 Remote powering solutions . 25
8.1 Input of the Remote Power Unit (RPU) . 25
8.2 Output characteristics of the Remote Powering system . 26
8.2.1 Remote powering output with an RFT-V circuit . 26
8.2.2 Remote powering output with an RFT-C circuit . 26
8.2.3 Remote powering output at up to 400 VDC . 26
8.2.3.0 General consideration on line electrical parameters and operation . 26
8.2.3.1 Steady state output voltage and current . 26
8.2.3.2 Transient state output voltage . 26
8.2.3.3 Architecture of RP distribution for reliable and safe operation management . 26
8.2.3.4 Requirements for stable and safe operation . 27
8.3 Input characteristics of remote power receiver . 28
8.3.1 RFT-V remote power receiver input in voltage mode . 28
8.3.2 RFT-C remote power receiver input in current mode . 28
8.3.3 Remote Power Receiver (RPR) input . 28
8.3.4 Remote Power Receiver (RPR) output . 29
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4 Draft ETSI EN 302 099 V2.3.0 (2026-09)
9 Power source interruption management . 29
10 Power management . 29
11 Safety, EMC, protection . 32
11.1 Product Safety . 32
11.2 EMC . 33
11.3 Protection/resistibility . 33
11.4 Earthing and bonding of access network powering solutions . 33
11.5 Wiring requirements of remote power feeding to TE through power cable at up to 400 VDC voltage
mode . 34
11.5.1 Protection against electric shock . 34
11.5.2 Protection against fire . 34
11.5.3 Protection against physical damage . 35
12 Environmental conditions. 35
Annex A (informative): Statistical data on electrical power supply availability, from the Low
Voltage (LV) public grid (mains) in various European countries . 36
Annex B (informative): Battery sizing . 39
B.0 General rules . 39
B.1 Back-up power . 40
B.2 Autonomy of the back-up power . 40
B.3 Battery Energy Storage Technology . 41
B.4 Battery utilization and state of health test . 41
Annex C (informative): Comparative reliability approach of remote powering versus local
powering . 42
Annex D (informative): Bibliography . 45
Annex E (informative): Change history . 46
History . 47

ETSI
5 Draft ETSI EN 302 099 V2.3.0 (2026-09)
Intellectual Property Rights
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Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee Environmental Engineering (EE),
and is now submitted for the combined Public Enquiry and Vote phase of the ETSI EN Approval Procedure (ENAP).

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

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
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6 Draft ETSI EN 302 099 V2.3.0 (2026-09)
1 Scope
The present document describes the principles for powering of Telecommunications Equipment (TE) in access
networks (both traditional copper based and Next Generation fibre and/or hybrid based) and contains requirements for
the powering systems, laying down:
• the characteristics of the input and output interfaces of the power units; the recommendations for TE power
protection, also regarding network integrity and public services availability requirements;
• the management data, necessary to guarantee the required availability of the network and provided public
services and to ensure the maintenance of the TE power units.
The present document takes into account the innovative characteristics of fibre-based access network equipment and
considers the intrinsic limitations of local power plants and power distribution when ICT equipment is installed inside
telecom centre, local exchanges, street cabinets or inside buildings: it goes from "complete integration of the power
plant in the TE" to "remote power feeding from a distant power plant".
The present document provides detailed information in annex A on the improved reliability of public electric power grid
and on the improved reliability and availability of new fibre-based NGA network. It should be considered that, for street
cabinet TE, the local power scenario is common, and, in that case, the main power supply availability characteristics are
mainly based on electrical energy provider's performance.
The present document applies to the powering of all equipment of the access network (copper, fibre or radio networks)
located inside or outside telecommunications centres or local exchanges, differentiating the applicable and sustainable
power protection requirements. The access network is defined as the part of the telecommunications network, which
comprises the network termination (passive or active) that is installed inside customer premises and the first exchange
that can be also the broadband local exchange.
2 References
2.1 Normative 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
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 300 132-1: "Environmental Engineering (EE); Power supply interface at the input to
Information and Communication Technology (ICT) equipment; Part 1: Alternating Current (AC)".
[2] ETSI EN 300 132-2: "Environmental Engineering (EE); Power supply interface at the input of
Information and Communication Technology (ICT) equipment; Part 2: -48 V Direct Current
(DC)".
[3] IEC 62368-3: "Audio/video, information and communication technology equipment - Part 3:
Safety aspects for DC power transfer through communication cables and ports".
[4] EN 60038: "CENELEC standard Voltages", (produced by CENELEC).
[5] EN 60664-1: "Insulation coordination for equipment within low-voltage systems - Part 1:
Principles, requirements and tests", (produced by CENELEC).
[6] EN 50310: "Application of equipotential bonding and earthing in buildings with information
technology equipment", (produced by CENELEC).
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7 Draft ETSI EN 302 099 V2.3.0 (2026-09)
[7] ETSI EN 300 253: "Environmental Engineering (EE); Earthing and bonding of ICT equipment
powered by -48 VDC in telecom and data centres".
[8] Recommendation ITU-T K.35: "Bonding configurations and earthing at remote electronic sites".
[9] Recommendation ITU-T K.45: "Resistibility of telecommunication equipment installed in the
access and trunk networks to overvoltages and overcurrents".
[10] ETSI ES 203 215: "Environmental Engineering (EE); Measurement Methods and Limits for Power
Consumption in Broadband Telecommunication Networks Equipment".
[11] ETSI EN 300 132-3: "Environmental Engineering (EE); Power supply interface at the input of
Information and Communication Technology (ICT) equipment; Part 3: Up to 400 V Direct Current
(DC)".
[12] ETSI ES 202 336-1: "Environmental Engineering (EE); Monitoring and Control Interface for
Infrastructure Equipment (Power, Cooling and Building Environment Systems used in
Telecommunication Networks); Part 1: Generic Interface".
[13] ETSI TS 101 548-1: "Access, Terminals, Transmission and Multiplexing (ATTM); European
Requirements for Reverse Powering of Remote Access Equipment; Part 1: Twisted pair
networks".
[14] ETSI EN 301 605: "Environmental Engineering (EE); Earthing and bonding of 400 VDC data and
telecom (ICT) equipment".
[15] Void.
[16] HD 60364 series: "Low Voltage electrical installations", produced by CENELEC.
[17] ETSI ES 202 336-8: "Environmental Engineering (EE); Monitoring and Control Interface for
Infrastructure Equipment (Power, Cooling and Building Environment Systems used in
Telecommunication Networks); Part 8: Remote Power Feeding System control and monitoring
information model".
[18] ETSI ES 203 408: "Environmental Engineering (EE); Colour and marking of DC cable and
connecting devices".
2.2 Informative 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
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding, but are not required for conformance to the present document.
[i.1] 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".
[i.2] ETSI EN 300 019-1-3: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1: Classification of environmental
conditions; Sub-part 3: Stationary use at weatherprotected locations".
[i.3] ETSI EN 300 019-1-4: "Environmental Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment; Part 1: Classification of environmental
conditions; Sub-part 4: Stationary use at non-weatherprotected locations".
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8 Draft ETSI EN 302 099 V2.3.0 (2026-09)
[i.4] 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".
[i.5] Void.
[i.6] Void.
[i.7] HD 60364-1: "Low-voltage electrical installations - Part 1: Fundamental principles, assessment of
general characteristics, definitions", (produced by CENELEC).
[i.8] ETSI EN 302 999: "Safety; Remote Power Feeding Installations; Safety requirements for the
erection and operation of information technology installations with remote power feeding".
[i.9] ENISA: "Power Supply Dependencies in the Electronic Communications Sector Survey, analysis
and recommendations for resilience against power supply failures", December 2013.
TH
[i.10] Council of European Energy Regulators (CEER): "7 CEER-ECRB Benchmarking report on the
quality of electricity and gas supply", Ref: C22-EQS-103-03.
[i.11] ARERA Annual report.
[i.12] ETSI TS 103 553-1: "Environmental Engineering (EE); Innovative energy storage technology for
stationary use; Part 1: Overview".
[i.13] Void.
[i.14] Void.
[i.15] IEC EN 62368-3: "Audio/video, information and communication technology equipment -
Part 3: Safety aspects for DC power transfer through communication cables and ports".
[i.16] Recommendation ITU-T L.1001: "External universal power adapter solutions for stationary
information and communication technology devices".
[i.17] IEC EN 62368-1: "Audio/video, information and communication technology equipment -
Part 1: Safety requirements".
[i.18] Directive (EU) 2022/2555 of the European Parliament and of the Council of 14 December 2022 on
measures for a high common level of cybersecurity across the Union, amending Regulation (EU)
No 910/2014 and Directive (EU) 2018/1972, and repealing Directive (EU) 2016/1148 (NIS 2
Directive).
[i.19] ETSI EN 303 215: "Environmental Engineering (EE); Measurement methods and limits for power
consumption in broadband telecommunication networks equipment".
[i.20] Void.
[i.21] TR 62102: "Electrical safety - Classification of interfaces for equipment to be connected to
information and communications technology networks", (produced by CENELEC).
[i.22] Void.
[i.23] Recommendation ITU-T L.1220 (2017-08): "Innovative energy storage technology for stationary
use - Part 1: Overview of energy storage".
[i.24] Void.
[i.25] Recommendation ITU-T L.1202 (2015): "Methodologies for evaluating the performance of an up
to 400 VDC power feeding system and its environmental impact".
[i.26] Void.
[i.27] Broadband Forum oneM2M TR-301: "Architecture and Requirements for Fiber to the Distribution
Point".
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9 Draft ETSI EN 302 099 V2.3.0 (2026-09)
[i.28] ETSI TS 103 553-2: "Environmental Engineering (EE); Innovative energy storage technology for
stationary use; Part 2: Battery".
[i.29] ETSI TS 103 553-3: "Environmental Engineering (EE); Innovative energy storage technology for
stationary use; Part 3: Supercapacitor".
[i.30] ETSI ES 202 336-11: "Environmental Engineering (EE); Monitoring and control interface for
infrastructure equipment (Power, Cooling and environment systems used in telecommunication
networks); Part 11: Battery system with integrated control and monitoring information model".
[i.31] Recommendation ITU-T I.112: "Vocabulary of terms for ISDNs".
[i.32] Recommendation ITU-T L.1221: "Innovative energy storage technology for stationary use -
Part 2: Battery".
[i.33] Recommendation ITU-T L.1222: "Innovative energy storage technology for stationary use -
Part 3: Supercapacitor technology".
[i.34] Recommendation ITU-T L.1200 (May 2012): "Direct current power feeding interface up to 400 V
at the input to telecommunication and ICT equipment".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
access gateway: gateway that interworks a significant number of analogue lines to a packet network and is located at
the operator's premises
access network: part of a telecommunications network between the Network Termination/Access Gateway and the first
switching unit
backfeeding or reverse powering: powering architecture that can supply power to access network units from the
customer through its final distribution access copper pair
NOTE: Access network units may be ONU, ONT or remote DSL units.
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
electric energy provider: provider of electrical energy from the public grid (mains)
ES1, ES2, ES3: See IEC EN 62368-1 [i.17].
interface A: -48 VDC power interface at input of Telecom/ICT equipment with voltage range and other electrical
specifications defined in ETSI EN 300 132-2 [2]
interface A1: up to 400 VAC rms power interface at input of Telecom/ICT equipment with voltage range and other
electrical specifications defined in ETSI EN 300 132-1 [1]
interface A3: up to 400 VDC power interface at input of Telecom/ICT equipment with voltage range, and other
electrical specifications defined in ETSI EN 300 132-3 [11]
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.
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10 Draft ETSI EN 302 099 V2.3.0 (2026-09)
local powering: powering principle of a telecommunications equipment by a (dedicated) power unit implemented in the
same location
network termination: functional group on the network side of a user-network interface
NOTE: Source: Recommendation ITU-T I.112 [i.31].
primary circuit: See IEC EN 62368-1 [i.17].
protective device selectivity: coordination of the operating characteristics of two or more protective devices to ensure
faulty equipment is safely disconnected with no or limited impact on other parts of the system
PS1, PS2, PS3: See IEC EN 62368-1 [i.17].
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
Remote Power Receiver (RPR): unit receiving remote DC from RPU though power lines and converting it to input
power interface of a TE or a radio unit
NOTE: The RPR may be an external unit with an adapted power interface (e.g. -48 VDC) or an integrated
function of a telecommunications equipment.
Remote Power Unit (RPU): unit, powered by the grid or by a DC power system delivering -48 VDC or up to
400 VDC, which supplies remote DC on power lines to distant Telecommunication Equipment (TE) e.g. radio unit or
RPR
Remote Powering (RP): 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.
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
secondary circuit: See IEC EN 62368-1 [i.17].
SELV circuit: See IEC EN 62368-1 [i.17].
TN-C: See HD 60364-1 [i.7].
TN-S: See HD 60364-1 [i.7].
TNV circuit: See EN 62368-1 [i.24].
TT: See HD 60364-1 [i.7].
3.2 Symbols
For the purposes of the present document, the following symbols apply:
I , I I , I I , I , power interface
1 2 3 4 5 6
L- Power line of negative potential polarity
L+ Power line of positive potential polarity
S Signal
S/P Filter separating signal S and power P
filter
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11 Draft ETSI EN 302 099 V2.3.0 (2026-09)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
A Autonomy of a battery
bat
AC Alternating Current
AN Access Node
ANU Access Network Unit
B Battery
CB Circuit Breaker
CO Central Office
CPE Customer's Premises Equipment
DC Direct Current
DC/DC Direct Current/Direct Current
NOTE: DC/DC are used in general in expression such as DC/DC converter or DC/DC conversion.
DSL Digital Subscriber Line
DSLAM Digital Subscriber Line Access Module
Energy Capacity of a battery
EC
bat
EMC ElectroMagnetic Compatibility
FTTB Fibre To The Building
FTTC Fibre To The Curb
FTTCab Fibre To The Cabinet
FTTdp Fibre To The distribution point
FTTH Fibre To The Home
HD Harmonization Document
HTA Home Terminal Adaptor
ICT Information & Communication Technology
IEC International Electrical Committee
ISDN Integrated Services Digital Network
IT Information Technology
ITU-T International Telecommunication Union - Telecommunication standardization sector
LED Light Emitting Diode
LPU Local Power Unit
LV Low Voltage
MDF Main Distribution Frame
MP Mid-Point
MTBF Mean Time Between Failure
MTTR Mean Time To Repair
NGA Next Generation Access
ONT Optical Network Termination
ONU Optical Network Unit
P Power
NOTE: Indices can be used associated with P as P in some clauses to clarify which power P is used in
indice
formula.
PD Powered Device
PM Powering Method
POTS Plain Old Telephone Service
PSE Power Sourcing Equipment
PSTN Public Switched Telephone Network
PSU Power Supply Unit
R Rectifier
RFT Remote Feeding Telecommunication
RFT-C Remote Feeding Telecommunication-Current
RFT-V Remote Feeding Telecommunication-Voltage
RP Remote Power
RPR Remote Power Receiver
RPU Remote Power Unit
SAIDI System Average Interruption Duration Index
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12 Draft ETSI EN 302 099 V2.3.0 (2026-09)
SAIFI System Average Interruption Frequency Index
SELV Safety Extra Low Voltage
TC Telecommunication Centre
TE Telecom Equipment
TLC TeLecommuniCation
TNV Telecommunication Network Voltage
UPS Uninterruptible Power Supply
VRLA Valve Regulated Lead Acid
4 Introduction
4.1 General
Innovative fibre-based and hybrid-based NGA network TE has changed the traditional powering paradigm.
The present document proposes the viable measures to comply with the integrity, availability and uninterrupted
telephone/VoIP provision that the European Directive defines for public networks [i.18].
It describes different configurations of powering the TE and the impacts on networks and services continuity and
reliability:
• Local power supply for TE (e.g. street cabinet, active network termination, etc.).
• Remote Feeding to TE from central office through copper access pair.
• Cluster Power supply feeding power for a cluster of TE.
• Remote power feeding to TE from centre or cluster power through a power cable.
• Back feeding or Reverse Powering architecture that can supply power to Access Network Units such as ONU
or ONT or remote DSL unit from the customer premises through its final distribution access copper pair.
The present document provides information on powering equipment, power strategy, local powering, remote powering,
power management, safety. EMC and environmental requirements.
5 Powering configurations
5.0 General
Next Generation Access (NGA) networks induce changes in the powering model and in the need of local back-up, when
compared to traditional access networks centre where the back-up is obtained by battery alone or with back-up
generator source (Diesel, fuel cell).
Both fixed and mobile NGA networks, usually, require local powering of access network active equipment that are
installed outside Central Offices and closer to the end user's premises, Typical NGA scenarios are fiber-based FTTH,
hybrid FTTC/FTTCab, FTTdp and FTTB architectures.
The new local powering scenario of fibre-based or hybrid fibre/copper NGA networks of a public Telecom networks
and services provider, shall include back-up measures in order to ensure to comply with continuity, availability and
reliability requirements defined by European Directive [i.18]. But for FTTB, FTTC/FTTCab, FTTdp with the increasing
deployment of a great number of distributed active small cabinets, that can be installed inside buildings (FTTB) or in
the street (FTTC, FTTCab), the basic power supply backup autonomy has to be optimized, due to a large number of
small active cabinets to be installed at optimized costs and dimensions. Only when it is required for some service offers,
a long back-up autonomy is obtained by local battery extension or alternatively by remote powering solution proposed
to avoid local energy storage.
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13 Draft ETSI EN 302 099 V2.3.0 (2026-09)
When a back-up is required, for defining its autonomy and its technology, the global availability and reliability of NGA
networks and the AC mains failure rate and availability are considered. In fact, AC mains statistical analysis has shown
in years 2000 to 2018 improvements of availability in many European countries. The NGA equipment availability has
also been improved compared to the traditional network technologies, as a result, the general availability of access
network is improved even with very limited or no local back-up (see annex A).
These considerations also apply to active Network Terminations like routers and/or VoIP access gateway installed and
powered inside end users' premises (or inside end users' building).
Electrical energy providers have responsibility for electricity continuity. Performance is monitored and reported by
Regulatory Authorities for example [i.10] in Europe and ARERA [i.11] in Italy. The failures and blackout risks apply to
all energy customers including TLC providers. This influences the main characteristic features of the different powering
architectures of access network equipment including two very important items:
• The point of connection to the electric grid due to the change in location of the active TE of the NGA network.
In a TLC site they are powered by a direct connection to the grid . When distributed they can be remotely DC
powered from a TLC site connected to the grid. NGA equipment can also be local Network Terminations and
Access Gateway, e.g. CPE installed inside an end users' premises powered by themselves or at a short distance
also powered by the customer by using a reverse powering solution. Figures 1 and 2 provide examples of
power configurations.
• The responsibility and location for power back-up when provided. The entity in charge can be the electrical
energy providers, TLC network and service providers or end users. The location can be inside big cabinet,
Telecom Central Office, broadband local exchange, etc. For NGA active street cabinets, in particular in the
case of a large number of small street cabinets, battery backup may not be practical or a sustainable solution.
As a consequence the definition of the optimal powering and back-up of equipment of the access network needs to
consider three main parts:
1) the Telecommunication Centre (TC) including local exchange site (e.g. broadband access node);
2) the access network (the area between the Telecom Centre or local exchange and the Customer's Premises);
3) the Customer's Premises Equipment (CPE).
Powering architectures
Active equipment of access networks can be powered:
• remotely from a telecommunications centre (centralized powering);
• from a power supply node (cluster powering);
• locally from the mains (local powering);
• from renewable sources (PV, wind, etc.).
NOTE: Any of the first three powering architectures preferably may be combined with renewable energy sources,
such as solar panels.
Inside these three main powering architectures, several configurations of powering are used. They are summarized in
clauses 5.1 to 5.2 and in figures 1, 2 and 3 by the acronyms PM1 to PM 10 (for powering).
Power back-up
Today, innovative NGA networks are based on grid local powering and/or end users provided local powering (home
power or reverse powering solution) DC remote powering is used as an alternative to avoid local energy storage when
required.
ETSI
14 Draft ETSI EN 302 099 V2.3.0 (2026-09)
The powering availability, continuity and reliability performance are, in principle, based on the performance that
electrical energy providers are able to assure, also complying with energy regulation requirements as big local batteries
are not practicable and are not required. Considering this short back-up, in annex A, a medium availability and
reliability performance for NGA networks, including the grid power supply continuity statistical component, is
illustrated: fibre-based NGA networks have better reliability performance then traditional copper based networks, even
including electricity blackout condition component. Further improvement of the grid power supply continuity by
electricity providers could be appropriate also to better protect NGA equipment.
For service, which needs to provide an available service even in the case of a mains outage, a power back-up unit can be
located either in the remote power source or in the equipment powered.
For NGA networks cabinets, service providers may provide protection for grid power supply fluctuation,
micro-interruptions and short interruptions (e.g. of order of seconds or minutes).
Regarding power backup for big site (e.g. Central Office) or for local exchange site, clauses 5.1 to 5.2 detail the
different installation configurations.
Location of the Telecom Equipment (TE)
On 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 Premises;
• in a building, public or private;
• in an indoor cabinet;
• in a street cabinet;
• on a pole or tower or streetlamp;
• 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 Premises and provides services for only one private customer.
Power interface's locations
Example of power interface locations are illustrated in figure 1, figure 2 and figure 3.
Seven power-feeding interfaces location (In) are mentioned in the following clauses. They are as follows:
I = Power interface between a -48 VDC/-60 VDC power plant and the fed equipment in a telecom
centre. -48 VDC shall comply with the interface "A" according to ETSI EN 300 132-2 [2].
I = Power interface between the public mains (commercial AC) and the fed equipment. It shall comply with the
A1 voltage interface defined in in ETSI EN 300 132-1 [1].
I = Power interface at the output of a source (Remote Power Unit (RPU) or TE) feeding a remote power line. It
shall comply with clause 8.
I = Power interface at the input of a distant Remote Power Receiver (RPR/TE), receiving energy from a remote
power line. It shall comply with clause 8.
I = Power interface between a local power unit and the fed equipment. It can be I
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