ITU-T SG15/WP1 Access Network
Transport, Energy Saving Checklist An Overview
David Faulkner, Rapporteur Q2/15
Tim Kelly, Head of Standardization Policy Division
Greg Jones, Counsellor SG15
Yoichi Maeda, SG15 Chairman
Andrew Nunn, ITU-T WP1/15 Chairman
Bernard Dugerdil, Freescale
ITU-T SG-15 Tutorials on
Energy-Saving
Geneva
14 February 2008
What is an Energy Saving Checklist?
z Tool for assessment of existing and new ITU-T
Recommendations in the light of climate change (TSAG LS
30)
z TD-288 GEN provides guidance on energy saving in access
networks for Rapporteurs and Editors
¾ Intended to ensure that drafting leads to an economic and
energy efficient solution
z Currently it is a set of questions relating to energy saving in
networks
¾ Greg Jones says it needs to be distilled down at the Question
level to offer “tips and tricks” which will stimulate energy
efficient thinking throughout the editing process
¾ A new name may be needed for the “Checklist”
¾ Will provide and the trigger to liaise with device groups such as
IEC
2 2
What are the benefits of energy
saving?
z Reduces the cost of energy
¾ for operators or end-users.
z Reduces the carbon footprint
¾ where electricity is sourced from fossil fuel
z Reduces the size and cost of backup
battery/generator
¾ to support lifeline services during power outage.
z Low power makes new technology solutions
feasible
¾ such as DSL or Ethernet back-powered Optical Network
Units (ONUs).
3 3
SG-15 Areas of Influence for Energy
Saving - Some characteristics
z Access Technologies:
¾ Serve mass populations over the final drop
¾ Potential for large energy savings in end devices
z Transport Technologies:
¾ Carry aggregated traffic, sharing devices across whole
populations (cf. train v car)
• Less potential for energy saving per customer
¾ SDH and packet allow frames and bytes to be extracted
directly from a bit-stream:-saving energy
• PDH requires a ‘multiplex mountain’ to extract bytes and frames
z Cross-connect or path-switching:
¾ Similar to transport but focus in SG-15 is on interfaces
rather than switch technologies
4 4
SG-15 Areas of Influence for Energy
Saving – Access Recommendations
Network end
Line
Termination
User end
Transmission path
Eg. Fibre, copper
Network
Termination
Transmission
Interfaces
R/S
S/R
z At Question level, the focus is on transmission interfaces
¾ Describing “The Signals Passing Through”
¾ But: “Black boxes” at the ends consume the energy
¾ For energy saving, the focus needs to include end devices
z Devices are covered in other bodies. Liaison is therefore
needed with
¾ International standards bodies such as IEC
• International Electrotechnical Commission
¾ Regional Policymakers such as
5 5
• EUROPEAN COMMISSION DIRECTORATE-GENERAL JOINT RESEARCH
CENTRE Institute for the Environment and Sustainability Renewable Energies Unit
“Code of Conduct for Broadband Equipment”
Relationship between bit-rate and
speed of access over time:100 G
10 G
G-PON
G-PON Plateau?
1G
VDSL Plateau?
100 M VDSL 2 at DP
Typical 100 M
bit-rate
10 M
per
second
1M
100k
18M VDSL2+ at cab
ADSL Plateau?
ADSL2
56 kbit/s
modems
Early ADSL
implementation
10k
Actual
1k
1990
6 6
1995
2000
2005
Forecast
2010
2015
2020
NT and LT Power
Consumpt Watts
Relationship between Power and Speed
E+3
Kilowatt
E+2
E+1
E-0
nics
o
r
t
lec Cycle
e
T
d L clock
n
a
NT es per
l
Jou
Watt
Scope for power
efficiency
improvement is
huge
100 million fold
E-1
E-2
Power
E-3
Milliwatt
E-4
Receiver Sensitivity
Watts
E-5
7 7 E6
E-6
Microwatt
E-7
E-8
E-9
Picowatt
rs
eive
c
e
ent?
R
m
l
e
t
a
r Bi
ctic
prov m
m
I
Pra ons pe
y
n
t
ienc at 1310
c
i
f
Pho
f
E Limit
m
50nm
u
5
t
1
n
t
Qua
mit a
i
L
ntum
Qua
Gigabit/s
E-10
Speed
E9
Terabit/s
Transmision Speed Bit/s
E12
Can we increase speed while saving power?
100 G
10 G
G-PON
G-PON Plateau?
1G
VDSL Plateau?
100 M VDSL 2 at DP
Typical 100 M
bit-rate
10 M
per
second
1M
100k
18M VDSL2+ at cab
ADSL Plateau?
ADSL2
56 kbit/s
modems
Early ADSL
implementation
10k
Actual
1k
1990
8 8
1995
2000
2005
Forecast
2010
2015
2020
LT and NT Power consumption trend
Relationship between bit-rate and
power consumption over time:-
Example Questions- 1. General
z Does this ITU-T Recommendation foresee the
development of devices or networks that will
require the consumption of electric power?
¾ YES / NO
z Will the implementation of this ITU-T
Recommendation change the power requirements
of existing devices or networks?
¾ YES / NO
z If YES, please assign an approximate score to the
significance of this Recommendation for climate
change,
¾ based on the following assumptions concerning power
consumption and market potential (see next Figure)
9 9
Categorisation of power
consumption and market potential
for ITU-T Recommendations
Power consumption per device / network
Market
potential
(users
within
10 years)
Less than 0.1
watt
Up to 1 watt
Up to 10
watts
Up to 100 watts
More than 1
kw
Fewer than 1
mill.
A
A
B
B
C
Up to 10
million
A
B
B
C
C
Up to 100
million
B
B
C
C
D
Up to 1 billion
B
C
C
D
D
More than one
1010billion
C
C
D
D
E
Example Questions- 2. Mitigation
z Does the ITU-T Recommendation
consider/enable lower power/energy
consumption of the technology or network
(e.g. NGN, ADSL2+), for instance by
enabling multiple power modes? YES / NO
z If so, how well does the ITU-T
Recommendation perform the action of
reducing energy consumption?
¾ For example, is power saving mandatory or
optional?
1111
SG-15 Questions- The Challenge
z All Questions are now requested to include
climate change issues (e.g. energy saving,
reducing greenhouse gases, etc).
z Each new Recommendation should identify
¾ its impact on climate change
¾ how it contributes towards measurable
reduction in emission of greenhouse gases
1212
Summary
z The checklist (TD-288-GEN) is at a first
draft stage for WP1
¾ A General Technical Document with useful
metrics and tools
¾ Is it workable yet for old and new
Recommendations?
• See Annex 1 and Annex 2 Respectively
¾ What improvements can be made at the
Question level?
z Can other WPs use it as a model?
1313
Thank You
For information, see
www.itu.int/ITU-T/climatechange
and
http://www.itu.int/ITUT/studygroups/com15/index.asp
1414