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Power Saving Methods in EPON
Power Saving Methods in EPON
IEEE P1904.1 SIEPON Seminar, Prague, Czech 1April 20, 2012
Susumu Nishihara, NTT Corporation
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ContributorsContributors
Hesham Elbakoury, Huawei TechnologiesMarek Hajduczenia, ZTE Corporation Ryan Hirth, Broadcom CorporationManabu Kato, PMC-SierraMitsunobu Kimura, Hitachi Ltd Hiroaki Mukai, Mitsubishi Electric Corporation
2IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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OutlineOutline
Need for power saving in fiber access Power consumption of optical access network Social requirement and regional guidelines
Power-saving mechanisms in EPON Requirement Mechanisms
Performance of power-saving mechanisms Calculation model Power-saving effectiveness
April 20, 2012 IEEE P1904.1 SIEPON Seminar, Prague, Czech3
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Power consumption of fiber accessPower consumption of fiber access
2.37 TWh annually (60-million ONUs in globe)– Corresponds to power consumption by 300-thousand US households
Majority of power consumption in fiber access: ONU To total power consumption of whole network system*:– ONUs: 60 %– OLTs: 7 %
April 20, 2012 IEEE P1904.1 SIEPON Seminar, Prague, Czech4
UNISNI
PONAccess NW
(60 %)
(7 %)(14 %)
(19 %)L2SW
OLTONU
ONUUNI
(81 %)Core/Metro NW
*http://www.ieee802.org/3/av/public/2008_09/3av_0809_otaka_1.pdf
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Regional guidelinesRegional guidelines
Specified to serve as:– Procurement guideline for operators– Target power-efficiency of equipment with test
methodologies
For example.. China
– Technical requirements and test methods for energy saving of access network equipment EPON system
Europe– Code of Conduct on Energy Consumption of Broadband
Equipment
Japan– Ecology Guideline for the ICT Industry
5IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Target power: GE-PON ONUTarget power: GE-PON ONU
JapanFigure of merit: P = average energy consumption (W)
Assessment scale P (W), 100Mbps UNI P (W), 1Gbps UNI
E 2.576 E 3.115
2.576 < E 2.944 3.115 < E 3.56
2.944 < E 3.312 3.56 < E 4.005
3.312 < E 3.68 4.005 < E 4.45
E > 3.68 E > 4.45
EuroIdle-State: no trafficOn-State: 20 Mbit/s downstream, 5 Mbit/s upstream
DeviceTier 2011-2012:1.1.2011- 31.12.2012
Tier 2013-2014:1.1.2013 - 31.12.2014
Idle-State (W) On-State (W) Idle-State (W) On-State (W)
GE-PON ONU, Gigabit Ethernet UNI 2.7 4.0 2.3 3.5
6IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Target power: GE-PON ONUTarget power: GE-PON ONU
JapanFigure of merit: P = average energy consumption (W)
Assessment scale P (W), 100Mbps UNI P (W), 1Gbps UNI
E 2.576 E 3.115
2.576 < E 2.944 3.115 < E 3.56
2.944 < E 3.312 3.56 < E 4.005
3.312 < E 3.68 4.005 < E 4.45
E > 3.68 E > 4.45Must be achieved by
the end of FY2012
EuroIdle-State: no trafficOn-State: 20 Mbit/s downstream, 5 Mbit/s upstream
DeviceTier 2011-2012:1.1.2011- 31.12.2012
Tier 2013-2014:1.1.2013 - 31.12.2014
Idle-State (W) On-State (W) Idle-State (W) On-State (W)
GE-PON ONU, Gigabit Ethernet UNI 2.7 4.0 2.3 3.5
7IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Overview of power-saving techniquesOverview of power-saving techniques
8
HGW ONUONU-CI
Device approaches:・ Power saving of components themselves
Power gatingClock gatingProcess shrinkage of semiconductor devices
・Energy Efficient Ethernet (IEEE 802.3az)
PC
IPTV
VoIP
Information in-home appliances
IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Overview of power-saving techniquesOverview of power-saving techniques
9
HGW ONUONU-CI
Device approaches:・ Power saving of components themselves
Power gatingClock gatingProcess shrinkage of semiconductor devices
・Energy Efficient Ethernet (IEEE 802.3az)
PC
IPTV
VoIP
Information in-home appliances
Network approach:ONU sleep
IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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RequirementsRequirements
10
Reduce ONU power consumption– Without affecting user experience
• IP telephony• IPTV• VoD• etc.
– Without negative impact such as:• Deregistration from OLT due to too-long sleep duration
» MPCP timeout» Clock frequency deviation between ONU and OLT
– With secured compatibilities with legacy equipment• Coexistence between OLT and..
» ONUs supporting power-saving mechanisms» ONUs not supporting power-saving mechanisms
IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Overview of ONU sleep techniqueOverview of ONU sleep technique
• Components powered down:• Tx mode: Transmitter• TRx mode: Transmitter and receiver
Time
Active
Sleep
No traffic observed Traffic observed
Active
Sleep
Periodic wake-up
e.g. 100 msec
IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Basic mechanisms ~OLT-driven~Basic mechanisms ~OLT-driven~
12IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
ONU OLTSleep_Allowed
Sleep
Active
Sleep
Active
Sleep Wake-up
Single cycle
Multiple cycles
ONU OLTSleep_Allowed
(Tx / TRx)
Sleep
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Basic mechanisms ~OLT and ONU interactions~Basic mechanisms ~OLT and ONU interactions~
13IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
ONU OLT
Sleep_Allow
Sleep
Active
Sleep
Active
SleepWake-up
Sleep_Ack(Tx /TRx / Wake-up)
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– Power down mode:• Tx mode, consumes 0.7 W• TRx mode, consumes 0 W• Power consumption in active mode: 2.1 W
– Bit rate 10 Gbit/s– Active duration 6 msec– Delay 10 msec
Power-saving performance ~10G case~Power-saving performance ~10G case~
14IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
pdpdactslpact
dlyactps PPP
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Ppd
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Power-saving performancePower-saving performance
15
0
100
200
300
400
500
600
700
800
0
0.5
1
1.5
2
2.5
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Red
uctio
n o
f CO
2em
ission (kto
n)T
Rx
pow
er c
onsu
mption (
W)
Sleep cycle duration (sec)
• Effective sleep duration: Over tens of msec • Sleep duration: Must be carefully designed
IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
Power, Tx modePower, TRx modeCO2, Tx modeCO2, TRx mode
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SummarySummary
Demands for power-efficient ONU– Large number of distribution– Social requirement around the world
Power-saving mechanisms in EPON– Without affecting on user experience– With guaranteed connectivity between OLT and..
• ONUs supporting power-saving mechanisms• ONUs not-supporting power-saving mechanisms
ONU power-saving performance– Effective with long sleep duration
• Sleep duration must carefully be designed
16IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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17IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Supplementary Slides
18IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Regional guideline ~ Europe ~ 1/2Regional guideline ~ Europe ~ 1/2
19IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Regional guideline ~ Europe ~ 2/2Regional guideline ~ Europe ~ 2/2
20IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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Regional guideline ~ Japan ~Regional guideline ~ Japan ~
21IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
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22IEEE P1904.1 SIEPON Seminar, Prague, CzechApril 20, 2012
*http://www.ieee802.org/3/av/public/2008_09/3av_0809_otaka_1.pdf