FTTH Conference 2010
ITU-T Standardization: from G-PON to 10G XG-PON
Review of G-PON standards
and their application
Yupeng (Roc) Xiong
Huawei Technologies
ITU-T Q2/15 contributor
Lisbon, 25 February 2010
Outline
Background
Core G-PON system standards
Ongoing improvements
Major applications
Lisbon, 25 February 2010
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Background: Older PON systems
ITU-T Q2/15 has a well established
program of PON system development
1996: G.982 – an early STM-PON
1998: G.983 – the ATM-PON system
2001: G.983.3,4,5 – the B-PON system
B-PON was strongly influenced by the
B-ISDN (ATM) network architecture
Not so relevant looking forward
Optics and microelectronics market changing
Explosion of Internet required more bandwidth
Lisbon, 25 February 2010
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Background: Motivations for G-PON
In 2001, Q2/15 began G-PON project
Key requirements
At least 1 Gb/s capacity
Full service (including legacy) support
Oriented towards IP services
Cost effective and FCAPS managable
Key “non-requirements”
Compatibility with B-PON not required
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Core G-PON requirements (G.984.1)
System parameters
Rates >1Gb/s
A range supported, to
permit economical options
Efficient use of BW
Avoid linecodes
DBA supported
Service parameters
Voice
POTS, leased lines,
special services
Data
10, 100, 1000Base-T
Ethernet
Other interfaces possible
Environmental
OLT indoors
ONU indoor or outdoor
Protection possible
Video
IP-video over data path
RF-video overlay
50ms recovery
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Core G-PON PMD layer (G.984.2)
The PMD spec provided many options for
implementers to find the optimum
Downstream rates: 1.2G and 2.5G
Upstream rates: 155M, 622M, 1.2G, and 2.5G
Loss Budgets: 20, 25, and 30 dB
Distance
20km physical reach
Support for power leveling
Makes burst mode reception easier
FEC option
Loss budget / ONU optics cost down
Lisbon, 25 February 2010
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Core G-PON TC layer (G.984.3)
A lightweight system that adapts both ATM and Ethernet to
the PON’s TDMA nature
Downstream frame
Bandwidth Map (PCB) – to manage the upstream
ATM partition – to support legacy services
GEM partition – to support packet services
Upstream burst transmission
PL-OAM, DBA, and protection included from the begining
PMF-TC Downstream
P-Frame Interval
PCBd
n
Payload n
TP-Frame = 125 uS
P-Frame Interval
PCBd
n+1
Payload n+1
"Pure" ATM cells
Section
N * 53 bytes
Lisbon, 25 February 2010
PCBd
n+2
TDM & Data Fragments
over GFP Section
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Core G-PON management (G.984.4)
Just making a data link is not enough for
an access system
Operators need a full operations support
system to provision, monitor, and troubleshoot
the access network
The ONU Management and Control
Interface (OMCI) provides this
OMCI was built on B-PON experience
Inherited much of the interoperability progress
that was made with B-PON systems
Lisbon, 25 February 2010
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Improve: G-PON Lite
The first round of G-PON recommendations were
ratified in 2004
These served as a basis for early implementers and
deployment
As the market matured, many of the options
included in the first round were found to be
extraneous
Q2/15 has revised and narrowed the
recommendations to reflect the market
PHY layer:
Rate: 2.5G down, 1.2G up
Loss budget: 28 dB
TC layer:
ATM partition dropped
Power leveling deprecated
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Improve: Ready for XG-PON (G.984.5)
Operators expect that G-PON will be widely
deployed by the time XG-PON will come
It is important that the evolution to XG-PON will be as
easy as possible
G.984.5 prepares G-PON for this by
Specifying the blocking filter for G-PON ONU Rx’s
Specifying reduced upstream bands for ONU Tx’s
X/S
22 dB
Narrow
G-PON
Reduced G-PON
7 dB
G-PON
1441 1450
1480
1500
Wavelength
(nm)
1530 1539
Original G-PON Spectrum
1260
1290 1300
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1320 1330
Wavelength
(nm)
1360
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Improve: Reach extenders (G.984.6)
The basic PON link is good for 20km
This reaches 90% of customers in the US market (a relatively
sparse population density)
Extending the reach can be one part of a strategy to reach
the “last 10%”
G.984.6 creates the specifications for mid-span reach
extenders
Total distance: 60km
Total loss budget: 56 dB
ONU
UNI
R/S
ONU
Mid-Span
Extender
ODN
S'/R'
OTL
R'/S'
OLT
S/R
SNI
R/S
UNI
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Improve: OMCI and Interoperability
The OMCI is what turns raw bandwidth into
billable services
G.984.4 has been constantly improved to add
new services and interfaces to the PON system
VDSL – to enable FTTnode and FTTB
MoCA – in-home networking
IGMP management – IPTV support
Optical line supervision – to reduce Ops costs
Interoperability has been a focus of Q2/15, in
conjunction with the FSAN Interop group and the
Broadband Forum
Nine test events so far
Nearly perfect plug-and-play results achieved
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Standards in Action: Implementation
Leading System vendors
Lisbon, 25 February 2010
Major chip vendors
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Major Application: Verizon FiOS
Office Parks
Small Businesses
ONT
Residential
ONT
ONT
ONT
Copper
Distribution
FTTP Overlay
Small Businesses
SAI
|X|
FDH
FDH
ONT
ONT
Circuit
Switch




FiOS Available in 16 States & Washington DC
12M HHs Passed YE2008; 18M HHs Passed 2010
BPON Deployment Starting in 2004
GPON Introduced in 4Q 2007
FiOS Internet Customers (M)
2.4
1.8
5.7
FTTP Full Build
ONT
ONT
New
Develop
ment
OLT
ONT
ONT
Copper
Feeder
ONT
FiOS TV Customers (M)
1.6
1.2
1.2
0.8
0.6
0.4
0.0
0.0
4Q06 1Q07 2Q07 3Q07 4Q07 1Q08 2Q08 3Q08
4Q06 1Q07 2Q07 3Q07 4Q07 1Q08 2Q08 3Q08
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Major Application: Europe
Fast emerging GPON market
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Worldwide Deployment of G-PON
GPON commercial region
GPON pre-commercial region
Non start
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G-PON enables network simplification
Backbone
…
CR
CR
CR
…
10GE
Service POP
BRAS
Multi-Layer Agg.
CR
CR
k*10GE
SR
MSE
BRAS SR VPN PE
GE/10GE
S-GW
MSE
n*10GE
5~10Km
OLT
PON
Extender CO
n*GE
AN
1-3Km
1-3Km
AN
1-3Km
AN
1-3Km
So Far (~2008)
Large AN Sites
Multi-Layer Structure
1-3Km
CO
AN
1-3Km
50~100Km
OLT
Splitter
1~3Km
Splitting
5~10Km
AN
1-3Km
AGW
n*10GE
m*GE/10GE
AN
CR
k*10GE
Large Capacity AGG SW
Metro
Access
…
Splitter
1~3Km
Medium-Term (2008~2010)
OLT Centralized
Single-Layer 10GE Aggregation
Multi Service GW Convergence
Lisbon, 25 February 2010
Splitter
1~3Km
Splitter
1~3Km
Remote area
Long-Term (2010~2016)
PON Extender for Remote Area
3-Layer Network Architecture
Fixed-Mobile POP Convergence
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Thank You!
For more information, contact
Frank Effenberger
Rapporteur Q2/15
Vice-chair, ATIS COAST-OAN
IEEE Comsoc TAOS std. liaison
feffenberger<at>huawei.com
Lisbon, 25 February 2010