ETSI ES 205 200-2-1 V1.2.1 (2014-03)

Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)

ETSI Standard
Access, Terminals, Transmission and Multiplexing (ATTM);
Energy management;
Global KPIs;
Operational infrastructures;
Part 2: Specific requirements;
Sub-part 1: Data centres
2 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)

Reference
RES/ATTM-0238
Keywords
performance, power
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
Individual copies of the present document can be downloaded from:
http://www.etsi.org
The present document may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive
within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2014.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
Contents
Intellectual Property Rights . 5
Foreword . 5
Introduction . 5
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Symbols . 9
3.3 Abbreviations . 10
4 System definition and boundaries . 10
5 Mapping to the objectives of ES 205 200-1 . 12
5.1 Energy consumption . 12
5.2 Task efficiency . 12
5.3 Energy re-use . 12
5.4 Renewable energy . 13
6 Global operational KPIs . 13
6.1 Scale . 13
6.2 Evolution . 13
6.3 Formulae. 14
6.3.1 KPI . 14
EM
6.3.1.1 Formula . 14
6.3.1.2 Definitions of terms. 14
6.3.1.3 Measurement procedures . 15
6.3.1.4 Criteria . 15
6.3.2 KPI . 15
EC
6.3.2.1 Formula . 15
6.3.2.2 Definitions of terms. 16
6.3.2.3 Energy sources . 16
6.3.2.4 Measurement points . 16
6.3.2.4.1 General . 16
6.3.2.4.2 Dedicated energy sources . 16
6.3.2.4.3 Shared supply systems . 17
6.3.2.5 Measurement procedures . 17
6.3.2.6 Criteria . 18
6.3.3 KPI . 18
TE
6.3.3.1 Formula . 18
6.3.3.2 Definitions of terms. 18
6.3.3.3 Measurement points . 18
6.3.3.4 Measurement procedures . 19
6.3.3.5 Criteria . 19
6.3.4 KPI . 19
REUSE
6.3.4.1 Formula . 19
6.3.4.2 Definitions of terms. 20
6.3.4.3 Measurement points . 20
6.3.4.4 Measurement procedures . 20
6.3.4.5 Criteria . 20
6.3.5 KPI . 21
REN
6.3.5.1 Formula . 21
6.3.5.2 Definitions of terms. 21
6.3.5.3 Measurement points . 21
ETSI
4 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
6.3.5.4 Measurement procedures . 21
6.3.5.5 Criteria . 21
6.4 Weighting factors . 21
6.4.1 Energy re-use . 21
6.4.1.1 W . 21
REUSE
6.4.1.2 W . 22
L
6.4.2 Renewable energy (W ) . 22
REN
Annex A (informative): Concepts: Energy management, sustainability and Key Performance
Indicators . 23
A.1 Energy management and sustainability concepts . 23
A.2 The status of Key Performance Indicators (KPIs) . 24
A.2.1 Technical KPIs . 24
A.2.2 Objective KPIs . 24
A.2.3 Global KPIs . 25
A.2.4 Summary . 25
History . 26

ETSI
5 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
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://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 final draft ETSI Standard (ES) has been produced by ETSI Technical Committee Access, Terminals, Transmission
and Multiplexing (ATTM), and is now submitted for the ETSI standards Membership Approval Procedure.
The present document is part 2, sub-part 1 of a multi-part deliverable covering operational energy management and
sustainability of broadband deployment, as identified below:
Part 1: "General requirements ";
Part 2: "Specific requirements":
Sub-part 1: Data centres;
Sub-part 2: Fixed (excluding cable) access networks;
Sub-part 3: Mobile access networks;
Sub-part 4: Cable Access Networks;
Part 3: "Monitoring of sustainability".
NOTE 1: Additional documents are in development by ETSI Technical Committee Access, Terminals,
Transmission and Multiplexing (ATTM) which include:
- 205 200-1-1: Energy management: Global KPIs: Operational infrastructures: Guidance (see NWIP
DES/ATTM-02025)
- 205 200-2-2: Fixed (other than cable) access networks (see NWIP DES/ATTM-02026)
- 205 200-3: Monitoring of other environmental viability aspects of sustainability (see NWIP
DES/ATTM-02027)
NOTE 2: A further document is under consideration ETSI Technical Committee CABLE to address "cable access
networks".
Introduction
Energy costs continue to rise, a trend that will continue in the future, while broadband penetration is introducing new
active equipment to the network architecture. In this context, and to reflect other environmental aspects of
sustainability, it is vital that the main telecommunication actors implement effective general engineering of fixed and
mobile broadband networks and sites provisioning, managing or using those networks (i.e. operator sites, operator data
centres and customer data centres) in order to respond to critical issues of energy consumption while proposing essential
solutions to true broadband deployment.
ETSI
6 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
These issues are of particular importance in data centres - both of operators and customers. To guide this process, it is
essential that metrics are defined, termed Global Key Performance Indicators (KPI ) that enable energy usage to be
EM
managed more efficiently.
This multi-part deliverable comprises:
• ES 205 200-1 [2]: a generic requirements document addressing Global KPIs for operational infrastructures;
NOTE: Global KPIs do not address design/operation of components or subsystems of broadband deployment
networks.
• a sub-series ES 205 200-2 [i.10] that defines the Global KPIs, and drives energy management targets, for
specific operational networks and sites and which describes how the Global KPIs are to be applied (which may
be used to support future regulatory objectives);
- ES 205 200-2-1: Data centres;
- ES 205 200-2-3: Mobile access networks.
These documents do not define KPI limits or targets (which is outside the scope of this multi-part deliverable).
These documents will accelerate:
• availability of operational infrastructure architectures and network implementations that use energy more
efficiently;
• the definition and attainment of sustainability objectives for operational broadband networks.
Within the present document:
• clause 4 explains the definition of a data centre in terms of the systems it comprises and the boundaries that
apply and shows that the present document is equally applicable to operator data centres, operator sites and
customers data centres;
• clause 5 describes how the Objective KPIs of the present document meet the requirements of
ES 205 200-1 [2];
• clause 6 describes the specific requirements of the Global KPI and the supporting Objective KPIs for data
centres;
• annex A discusses the roles of different types of Key Performance Indicators i.e. Technical, Objective and
Global in relation to the overall energy management concepts of the present document.
The comparative costs and environmental impacts of different energy sources are not addressed in the present
document.
ETSI
7 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
1 Scope
The present document specifies Global Key Performance Indicators (KPI ) in relation to energy management for
EE
operator data centres (ODC), operator sites (OS) and customer data centres (CDC) and addresses the following
objectives:
• energy consumption;
• task efficiency;
• energy re-use;
• renewable energy.
The definition of the Globals KPIs (clause 6) are in accordance with requirements of ES 205 200-1 [2] (as described in
clause 5) in relation to:
• infrastructure scalability;
• infrastructure evolution;
• formulae and definitions of terms;
• measurement points and procedures.
The present document also provides information on system definition and boundaries (clause 4).
The comparative costs and environmental impacts of different energy sources are outside the scope of the present
document.
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.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] CENELEC EN 50600-2-2: "Information technology - Data centre facilities and infrastructures -
Part 2-2: Power distribution".
[2] ETSI ES 205 200-1: "Access, Terminals, Transmission and Multiplexing (ATTM); Energy
management; Global KPIs; Operational infrastructures; Part 1: General requirements".
[3] CEN EN 1434 series: "Heat Meters".
ETSI
8 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
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] CENELEC EN 50600-1: "Information technology - Data centre facilities and infrastructures -
Part 1: General requirements".
[i.2] EC Mandate M/462; "Standardisation mandate addressed to CEN, CENELEC and ETSI in the
field of Information and Communication Technologies".
[i.3] ETSI TR 105 174-2-2: "Access, Terminals, Transmission and Multiplexing (ATTM); Broadband
Deployment and Energy Management; Part 2: Network sites; Sub-part 2: Data centres".
[i.4] European Commission DG JRC Code of Conduct for Data Centre Energy Efficiency.
[i.5] Recommendation ITU-T L.1300: "Series L: Construction, installation and protection of cables and
other elements of outside plant: Best practices for green data centers".
[i.6] European Commission DG JRC Code of Conduct on Energy Consumption of Broadband
Equipment.
[i.7] ISO Guide 82: "Guide for addressing sustainability in standards".
[i.8] ETSI TR 105 174-1: "Access, Terminals, Transmission and Multiplexing (ATTM); Broadband
Deployment and Energy Management; Part 1: Overview, common and generic aspects".
[i.9] ETSI ES 205 200 (all parts): "Access, Terminals, Transmission and Multiplexing (ATTM); Energy
management; Global KPIs; Operational infrastructures".
[i.10] ETSI ES 205 200-2 (all parts): "Access, Terminals, Transmission and Multiplexing (ATTM);
Energy management; Global KPIs; Operational infrastructures; Part 2: Specific requirements".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
core infrastructure (core network): functional elements (that is equipment and infrastructure) that enable
communication between operator sites and/or operator data centres
NOTE: See TR 105 174-1 [i.8].
customer data centre: data centre that is not directly connected to the core network
data centre: structure, or group of structures, dedicated to the centralized accommodation, interconnection and
operation of information technology and network telecommunications equipment providing data storage, processing and
transport services together with all the facilities and infrastructures for power distribution and environmental control
together with the necessary levels of resilience and security required to provide the desired service availability
energy consumption: total consumption of electrical energy by an operational infrastructure
energy management: combination of reduced energy consumption and increased task efficiency, re-use of energy and
use of renewable energy
energy re-use: transfer or conversion of energy (typically in the form of heat) produced by the operational
infrastructure to do other work
fixed access network: functional elements that enable wired (including optical fibre) communications to customer
equipment
ETSI
9 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
Information Technology Equipment (ITE): equipment providing data storage, processing and transport services for
subsequent distribution by network telecommunications equipment
ITE and/or NTE load: total requirement for power by a set of information technology equipment (ITE) and/or network
telecommunications equipment (NTE)
mobile access network: functional elements that enable wireless communications to customer equipment
Network Telecommunications Equipment (NTE): equipment dedicated to providing direct connection to core and/or
access networks
objective KPI: KPI assessing one of the objectives of operational energy performance which is subsequently used to
define a Global KPI for energy management (KPI )
EM
operational infrastructure: combination of information technology equipment (ITE) and/or network
telecommunications equipment (NTE) together with the power supply and environmental control systems necessary to
ensure provision of service
operator data centre: data centre embedded within the core network
operator site: premises accommodating network telecommunications equipment providing direct connection to the
core and access networks and which may also accommodate information technology equipment
primary distribution equipment: equipment which is required to manage, control and convert incoming power
supplies (primary, secondary and, where appropriate, additional) in a form suitable for distribution by secondary
distribution equipment
NOTE: See EN 50600-2-2 [1].
renewable energy: energy produced from dedicated generation systems using resources that are naturally replenished
secondary distribution equipment: equipment which is required to manage, control and distribute the power provided
by the primary distribution equipment to the short-break and unprotected sockets within the data centre and to the
tertiary distribution equipment
NOTE 1: See EN 50600-2-2 [1].
NOTE 2: The power supply may be single-phase AC, three-phase AC or DC. If there is a change from 3-phase to
1-phase supply, this is generally achieved at the secondary distribution equipment that is served directly
from the primary distribution equipment.
task efficiency: measure of the work done (as a result of design and/or operational procedures) for a given amount of
energy consumed
3.2 Symbols
For the purposes of the present document, the following symbols apply:
Δt the maximum time variation between measurement points of the different Objective Key
Performance Indicators within a given Global Key Performance Indicator
KPI Objective Key Performance Indicator of energy consumption
EC
KPI Global Key Performance Indicator of energy management
EM
Objective Key Performance Indicator of renewable energy usage
KPI
REN
KPI Objective Key Performance Indicator of energy re-use
REUSE
KPI Objective Key Performance Indicator of task efficiency
TE
T period of time over which Objective KPIs are assessed
KPI
T the minimum time between which the Objective KPIs can be assessed to determine relevant trend
REPEAT
information
weighting factor applied to KPI
W
EC EC
W weighting factor within KPI
L REUSE
W weighting factor applied to KPI
REN REN
W weighting factor applied to KPI
REUSE REUSE
W weighting factor applied to KPI
TE TE
ETSI
10 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CDC Customer Data Centre
ffs for further study
ITE Information Technology Equipment
KPI Key Performance Indicator
NTE Network Telecommunications Equipment
ODC Operator Data Centre
OS Operator Site
PDU Power Distribution Unit
UPS Uninterruptible Power Supply
4 System definition and boundaries
Figure 1 shows the schematic of the operational infrastructures of broadband deployment as contained with the ESO
response to the EC Mandate M/462 [i.2].
Core network Backhaul network Access network
OS BST TE
Terrestrial
mobile access infrastructure
“IT End-use” equipment*
“IT End-use” equipment*
Satellite mobile access infrastructure
TE
ODC OS Satellite
Non “IT End-use” equipment
Fixed access
infrastructure
“IT End-use” equipment*
OS LON TE
Distribution
network
Transport network
Access network
* out of scope of Mandate M/462

NOTE: Not all the terms and abbreviations of Figure 1 are included in clause 3 of the present document.

Figure 1: Schematic of core network together with fixed and mobile access infrastructures
With reference to Figure 1:
• an operator data centre (ODC) accommodates a mixture of information technology equipment (ITE) and
network telecommunication equipment (NTE);
• an operator site (OS) will also accommodate a mixture of ITE and NTE - where the NTE may provide
connections to connections to core, fixed access, terrestrial mobile access and satellite mobile access network
infrastructures.
It is unlikely that either the ODC or OS of Figure 1 would allow separate assessment of energy consumption of the ITE
and the various NTE for the disparate network infrastructures. As a result, the boundaries applied to ODC and OS in
relation to the objective of Global KPIs for operational infrastructures have to be modified from that of Figure 1 to that
shown in Figure 2.
ETSI
11 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
Similarly, the principal difference between the ODC and the OS would be the relative proportion of ITE and NTE as is
shown in Figure 3. Furthermore a customer data centre (CDC) would also contain NTE - although generally providing a
connection to the access networks. For this reason, the present document considers its Global KPIs for operators data
centres to also be applicable to OSs and CDCs.
The Global KPIs are therefore applicable to ODCs, OS and CDCs of all types, regardless of:
• their Availability Class as defined in CLC EN 50600-1 [i.1];
• the business model of the data centre (such as operator, enterprise, co-location service or co-host service);
• the type, quantity and relative proportions of ITE and NTE.
Energy efficiency boundaries
BST
Terrestrial
mobile access infrastructure
Satellite mobile access infrastructure
ODC OS Satellite
Core
network
Fixed access
infrastructure
LON TE
Figure 2: Schematic of energy efficiency boundaries of ODC and OS
Core NTE to other
Core NTE to OSs
ITE
ODCs
Core NTE to other OS
Mobile access NTE
Core NTE to ODC Satellite mobile access NTE
ITE
Fixed access NTE
Core NTE to other OS
Figure 3: Schematic of generalized ODC and OS contents
ETSI
12 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
5 Mapping to the objectives of ES 205 200-1
5.1 Energy consumption
A reduction in the energy consumption required to provide a given level of service is a primary objective of the present
document.
The KPI for energy consumption (KPI ) may be applied to a single data centre or a group of data centres under
EC
common governance. If the KPI is applied to a group of data centres under common governance then the KPIs of
EC
clauses 5.2, 5.3 and 5.4 shall apply to the same group.
may be improved by local actions within individual data centres and/or global actions applied to the group
The KPI
EC
under common governance.
Requirements or recommendations in relation to the improvement of the energy consumption of the ITE, NTE and
support infrastructures are not within the scope of the present document. Best practices enabling reductions in energy
consumption of operational data centres are described in a number of documents including:
• TR 105 174-2-2 [i.3];
• European Commission DG JRC Code of Conduct for Data Centre Energy Efficiency [i.4];
• Recommendation ITU-T L.1300 [i.5].
Objectives for energy consumption of NTE within OS are included in the European Commission DG JRC Code of
Conduct on Energy Consumption of Broadband Equipment [i.6]. Similar equipment will also be found in ODCs and
CDCs.
5.2 Task efficiency
An improvement in task efficiency is a primary objective of the present document.
In a data centre, an improvement of the KPI for task efficiency (KPI ) reflects a reduction of the overall energy
TE
consumption required to both power a given ITE and/or NTE load and to support (e.g. cool) the equipment associated
with that load over a given period of time.
The KPI may be applied to a single data centre or a group of data centres under common governance. If the KPI of
TE EC
clause 5.1 is applied to a group of data centres under common governance then the KPI and the KPIs of clauses 5.3
TE
and 5.4 shall apply to the same group.
It should be noted that the work done by the load is not a basis for the KPI due to the wide variety of operations
TE
performed by the ITE and NTE in data centres.
5.3 Energy re-use
The re-use of energy is a secondary objective of the present document subject to the following conditions:
• "non-use" is better than "re-use" and therefore the KPI will reflect a preference for energy consumption
REUSE
reduction rather than re-use;
• any KPI shall reflect a preference for re-use of energy in the form of heat generated by the ITE/NTE
REUSE
rather than from poorly designed facilities and infrastructures.
All energy input to a data centre is converted into heat.
The KPI for energy re-use (KPI ):
REUSE
• provides the main incentive to the re-use of heat up to the quantity produced by cooling the ITE and/or NTE
load;
ETSI
13 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
• provides a lower incentive to the re-use of heat produced by the facilities and infrastructures of the data centre
including, but not limited to, power distribution, environmental control, lighting security and safety systems.
The KPI may be applied to a single data centre or a group of data centres under common governance. If the KPI
REUSE EC
of clause 5.1 is applied to a group of data centres under common governance then the KPI and the KPIs of
REUSE
clauses 5.2 and 5.4 shall apply to the same group.
KPI can only be assessed and included in subsequent calculation and presentation of KPI if the energy re-used is
REUSE EE
measurable in kWh at the intended point of delivery i.e. any losses in the delivery system shall not be included.
5.4 Renewable energy
The use of renewable energy is a secondary objective of the present document.
The energy provided to data centres comes from either utility (grid) or local sources (non-renewable or renewable).
A data centre is unlikely to meet all of its energy needs from local renewable sources on a continuous basis. However,
the provision of energy to specific and non-critical functions can be switched from the utility supply when adequate
renewable energy is available.
The scope of the KPI for renewable energy use (KPI ) only takes locally generated renewable energy into account.
REN
NOTE: This does not, as yet, take into consideration any proportion of renewable electricity in the mix of
production of utility supplies certified as "green" (e.g. based on the carbon footprint of the energy source)
by electricity suppliers or in accordance with nationally recognized schemes.
may be applied to a single data centre or a group of data centres with a common governance. If the KPI of
The KPI
REN EC
clause 5.1 is applied to a group of data centres under common governance then the KPI and the KPIs of clauses 5.2
REN
and 5.3 shall apply to the same group.
6 Global operational KPIs
6.1 Scale
KPI is measured in kWh.
EM
The dominant factor in the calculation of KPI is the Objective KPI for energy consumption (KPI ). Large data
EM EC
centres that are fully utilized will naturally have higher values of KPI .
EC
The value of KPI is mitigated by the weighted subtraction of any valid energy re-use (KPI ) and any energy
EC REUSE
contribution from locally generated renewable sources (KPI ).
REN
This modified consumption value is multiplied by the Objective KPI for task efficiency (KPI ) which increases the
TE
value of the KPI in direct proportion to the lack of task efficiency i.e. data centres with poor task efficiency will be
EM
adversely affected.
This approach allows:
• the energy impact of all scales of data centres to be assessed but not compared;
• regulatory objectives to be applied to groups of data centres which have the greatest individual energy impact.
6.2 Evolution
Since KPI is measured in kWh, a given data centre is able to be assessed throughout its operational life.
EM
KPI is applicable from early stages, while KPI is low and KPI may be higher than the design objective (i.e. task
EM EC TE
efficiency may be poorer than that of a fully utilized data centre), to a more complete utilization stage when KPI
TE
should match the design goals and KPI is higher.
EC
ETSI
14 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
Where operational actions are taken to improve the task efficiency (i.e. reduce the value of KPI ), KPI will reduce in
TE EM
all cases when the initial value of KPI is lower than 2,0. However, for data centres with higher values of KPI , KPI
TE TE EM
will only reduce if reductions of ITE and/or NTE load are supported by reductions in non-"ITE and/or NTE load"
consumption.
This approach encourages:
• the re-engineering of the supporting infrastructures (e.g. power distribution and environmental control
systems) in older legacy data centres which tend to exhibit high KPI values;
TE
• the optimization of ITE and/or NTE loads by selection, configuration and utilization of equipment and
management systems.
6.3 Formulae
6.3.1 KPI
EM
6.3.1.1 Formula
An assessment of KPI requires that the energy supplied to the data centre provides all the primary functions of the
EM
data centre (i.e. ITE/NTE load, environmental control, etc.). If the supply of energy of any of the non-"ITE and or NTE
loads" is provided by other supplies not included in KPI then KPI cannot be assessed.
EC EM
KPI is defined mathematically as:
EM
()()()( ) ,
KPI = KPI × KPI × 1− KPI ×W × 1− KPI ×W
EM EC TE REN REN REUSE REUSE
subject to a minimum value of 0.
This is shown schematically in Figure 4.
Default weighting factors are detailed in clause 6.4.
1 - 1 -
KPI X KPI X X
= KPI
EC TE
EM
KPI X W KPI X W
REN REN REUSE REUSE
Low efficiency High efficiency
KPI High Low
EC
KPI High Low
TE
KPI Low Improvement High
REUSE
KPI Low High
REN
KPI High Low
EM
Figure 4: Schematic of data centre objective and global KPIs
6.3.1.2 Definitions of terms
See clause 3.2.
ETSI
15 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
6.3.1.3 Measurement procedures
The objective KPIs shall be measured on a single data centre (or a common group of data centres) over the same period
of time (T ) subject to the allowed variation (Δt) as shown in Figure 5.
KPI
6.3.1.4 Criteria
The default value of T as shown in Figure 5 shall be 365 days (in order to take account of the climatic variations that
KPI
will be experienced by the operational infrastructure). T shall be one calendar month.
REPEAT
The maximum time difference in the periods of assessment of the objective KPIs (Δt as shown in Figure 5) shall be 7
days.
, W )
In order to make effective comparisons between different periods of assessment, the weighting factors (W
REN REUSE
employed shall be the same in each period.
KPI KPI KPI KPI
EC TE REUSE REN
T
KPI
Po w e r
En erg y
T
REPEAT
1 2 3 4 5 6 7 8 9 101112 1314 151617 1819 2021 22 2324
Month s
Δt
KPI
EC
KPI
TE
KPI
REN
KPI
REUSE
T
KPI
time
Figure 5: Schematic of KPI assessment periods
6.3.2 KPI
EC
6.3.2.1 Formula
KPI for assessment period k is defined mathematically as:
EC
N
(EC ) (k ) (k )
KPI ()t = KPI = C for k =1, 2, 3, ….
EC k EC ∑ n
=1
n
ETSI
16 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
where:
S
n
(k ) (EC ) (k )
C = (1+ MP )× C
∑
n s,n s,n
n=1
6.3.2.2 Definitions of terms
n = data centre number (if the assessment is applied to a common set of data centres)
N = total number of data centres (if the assessment is applied to a common set of data centres)
(k) begin end
C = total energy consumption by data centre n during the KPI assessment interval t to t as
n k-1 k-1
described in detail in ES 205 200-1 [2]
(k)
C = total energy consumption for energy source s in the data centre n during the KPI assessment
s,n
begin end
interval between t and t as described in detail in ES 205 200-1 [2]
k-1 k-1
s = energy source number
S = total number of separate energy sources of the data centre n including those provided only during
n
fault conditions
(EC)
MP = measurement penalty for energy source s at data centre n which takes account of the means by
s,n
which energy consumption measurement is obtained
6.3.2.3 Energy sources
The sources of energy consumed during the assessment period are assumed to be:
• utility (grid) supply;
• local sources of electricity based on fossil energy;
• local sources of electricity based on renewable sources;
• externally-provided thermal energy.
6.3.2.4 Measurement points
6.3.2.4.1 General
Requirements for the measurement of the energy consumption parameters for each data centre are specified in
EN 50600-2-2 [1]. Figure 6 provides additional detail relevant to the present document.
6.3.2.4.2 Dedicated energy sources
Where the utility (grid) and/or the local source(s) are dedicated to the data centre then:
(k)
• the consumption C from the utility (grid) supply(s) shall be measured at the input to the transformer (point
s,n
(EC)
A in Figure 6) in which case MP = 0. Where this is not possible:
s,n
(k) 1 (EC)
- C may be measured at the output of the transformer (point A in Figure 6) and MP = 0,015 (i.e.
s,n s,n
1,5 % of additional penalty);
(k)
- C may be measured at the input to the switchgear in the primary distribution equipment or at the
s,n
input to the supply transfer switch (if present) of the data centre (points B in Figure 6) and
(EC)
MP = 0,02 (i.e. 2 % of additional penalty).
s,n
ETSI
Supply transfer
switchgear
17 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
(k)
• the consumption C from local sources (including those provided only during fault conditions) shall be
s,n
(EC) (k)
measured at their output in which case MP = 0. Where this is not possible, C may be measured at the
s,n s,n
(EC)
input to the supply transfer switch of the data centre (point B in Figure 6) and MP = 0,02 (i.e. 2 % of
s,n
additional penalty).
(k)
For externally-provided thermal energy, the consumption C shall be determined as follows:
s,n
• measuring using a calorie counter/integrator according to EN 1434 series [3] where the distribution loop is
considered a closed loop, at entry to the data centre and converting that measurement to a kWh value;
• calculating the electrical energy required to deliver that thermal energy by dividing that kWh value by a
conversion factor of either:
- a known and certified value which combines the energy efficiency ratio with the relevant distribution
(EC)
losses (and MP = 0,0);
s,n
(EC)
- if a known and certified value is not available, then the conversion factor shall be 2,5 and MP = 0,08
s,n
(i.e. 8 % of additional penalty).
Secondary
distribution
Equipment
(departmental PDUs)
Short break, unprotected
Primary distribution
Socket or locally
equipment
protected sockets
Primary/secondary
supply
A 1
B
A
UPS
Protected
or
socket
dc supply
Tertiary distribution
equipment
Primary/secondary
Primary distribution Short break, unprotected
supply equipment Socket or locally
protected sockets
A
A B
Additional
supply UPS
Protected
or
A socket
dc supply
Tertiary distribution
equipment
Granularity
Level 3
of
= measurement point
EN 50600-2-2
Figure 6: Measurement points for energy consumption
6.3.2.4.3 Shared supply systems
Where the utility (grid) and/or the local source(s) are shared with other infrastructures within the premises and separate
measurements as detailed above is not possible then the relevant consumption of the data centre shall be measured at the
(EC)
input to the feed(s) dedicated to the data centre and MP = 0,05 (i.e. 5 % of additional penalty).
s,n
6.3.2.5 Measurement procedures
(k)
C for each data centre is defined as the energy consumption (kWh) recorded by all meters (utility (grid) and local
s,n
begin end
sources) over the specified time period used to assess KPI (i.e. T between t and t subject to the allowed
EM KPI k-1 k-1
variation (Δt) as shown in Figure 5 and described in more detail in ES 205 200-1 [2]).
ETSI
18 Final draft ETSI ES 205 200-2-1 V1.2.0 (2014-01)
6.3.2.6 Criteria
The data centre shall operate at its design level of service availability during the period of assessment. This includes any
circumstances during which fault conditions exist and alternative sources are used (e.g. testing, online
...