1) The document discusses research directions for improving energy efficiency in wireline access networks by 10-100x over the next decade. 2) Key approaches proposed include fast sleep modes for ONUs, bit-interleaved PON, virtual home gateways, low power optics and electronics, and transparent customer premises equipment. 3) Goals are to reduce power consumption per subscriber through more efficient protocols, hardware designs, and shifting intelligence from customer premises to the network.

1. Research directions for
energy efficient wireline access
April 04, 2012
Peter.Vetter@alcatel-lucent.com
Peter Vetter, Dusan Suvakovic, Keith Chow

2. Wireline Access WG
Target: 10x per user – 100x efficiency gain
Un-cooled
tunable lasers Novel PON protocols;
Virtual Low power CPE
PON Sleepmode
HGW
Min. energy access architectures
Fiber in the Home
Also:
Hybrid PON
TNO
ZTE, KAIST
Low power OFDM in
optical access

3. Wireline Access: GPON, XGPON and BI-PON
10.0
GPON XGPON
8.0 Sleepmode
EE HW design
Wireless LAN
6.0
W/subscriber
OLT(/subscriber)
Sleepmode 2
HGW processor
Virtual HGW Wireline LAN (Eth.)
PON digital
4.0 Long reach
OE PON
Transparent CPE
2.0 BI PON
Low power
Optics
Low power
electronics
0.0
2010 Short Term 2014 2015 2016 2017 2018 2019 2020 2021
2012 2013 Medium Term Long Term

4. Fast Sleep Mode
 Aim for awake time ONU proportional to useful payload
 Challenges
 Schedule probing cycles and awake time with minimum
impact on QoE
 Minimize power during sleep state
 Minimize wake-up time
P Active state:
Probing
Bursts of data
Fast sleep state:
No data
e.g. ~10 ms t

5. Wireline Access: GPON, XGPON and BI-PON
10.0
GPON XGPON
8.0 Sleepmode
Wireless LAN
6.0
W/subscriber
OLT(/subscriber)
Sleepmode 2
HGW processor
Wireline LAN (Eth.)
PON digital
4.0
OE PON
2.0
0.0
2010 Short Term 2014 2015 2016 2017 2018 2019 2020 2021
2012 2013 Medium Term Long Term

6. Standard XG-PON
10 Gb/s ~10 Mb/s

7. Bit-Interleaving PON
10 Gb/s ~10 Mb/s

8. Demonstrator
DS: Bit-interleaved data ONU 2
Line card
DS: 10Gbit/s ONU 1
OLT- BI
DS Tx ONT-FPGA
MAC
UNI
(FPGA) Rx BIPON
DS
Deser
Delta
DS: Packet data
ONU 2
Line card
DS: 10Gbit/s ONU 1
OLT- XGPON
MAC DS Tx ONT-FPGA
(FPGA)
UNI
Rx XGPON
DS
Deser

9. Green PON ONT & Home prototype evaluation
Dynamic
FPGA implementation causes large
Power (W) Ratio static power consumption
XGPON1 3.200 1.00
Sleep state 1.900 1.68 Measured static power as baseline to
establish dynamic power consumption
BIPON 1 Gbit/s 0.120 26.67
=> Good indicator of potential gain in
BIPON 10 Mbit/s 0.040 80.00 custom ASIC.
Prototype with FPGA (Q1 2012) ASIC designed (for Q2 2012)

10. 4.0
Wireline access PON improvements
3.0
Wireless LAN
W/subscriber
OLT(/subscriber)
BI PON HGW processor
2.0
Wireline LAN (Eth.)
PON digital
OE PON
1.0
0.0
2010 Short Term 2014 2015 2016 2017 2018 Long Term 2021
2012 2013 Medium Term 2019 2020

11. Virtual Home Gateway / Quasi-passive CPE
 Transparent CPE providing connectivity in-house and to network
• Functions of current CPE moved to virtual HGW in network
• Low power connectivity (“quasi-passive”) or transparant (“passive”) CPE
 Savings:
• Cut-through of high bitrate services to terminal: LAN interfaces on CPE
• Lower power by processor platform sharing
Virtual HGW performs
- routing and NAT Quasi-passive CPE
- firewalling
- OAM management

12. 4.0
Wireline access PON improvements
Virtual HGW
3.0
Wireless LAN
W/subscriber
Transparent CPE OLT(/subscriber)
HGW processor
2.0
Wireline LAN (Eth.)
PON digital
OE PON
1.0
0.0
2010 Short Term 2014 2015 2016 2017 2018 Long Term 2021
2012 2013 Medium Term 2019 2020

13. 4.0
Wireline access PON improvements
3.0
Wireless LAN
W/subscriber
OLT(/subscriber)
HGW processor
2.0
Wireline LAN (Eth.)
PON digital
Low power OE PON
Optics
1.0
Low power
electronics
0.0
2010 Short Term 2014 2015 2016 2017 2018 Long Term 2021
2012 2013 Medium Term 2019 2020

14. Wireline Access Energy Efficiency
1000
Low power
electronics
Low power
Optics
GT Efficiency Gain
BI PON
100 Business As Usual
Transparent CPE
Moore's Law efficiency
Long reach
improvement
Virtual HGW Relative
subscriber rate
Sleepmode 2 Gain (rate double 4y)
10
Gain (rate double 6y)
EE HW design
Sleepmode
1
2010 2015 2020