Lisbon, 25 February 2010

Review of G-PON standards and their application

Yupeng (Roc) Xiong

Huawei Technologies

ITU-T Q2/15 contributor

FTTH Conference 2010

ITU-T Standardization: from G-PON to 10G XG-PON

Lisbon, 25 February 2010 2

Outline

Background

Core G-PON system standards

Ongoing improvements

Major applications

Lisbon, 25 February 2010 3

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 4

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

Lisbon, 25 February 2010 5

Core G-PON requirements (G.984.1)

System parameters

Rates >1Gb/sA range supported, to

permit economical options

Efficient use of BWAvoid linecodes

DBA supported

EnvironmentalOLT indoors

ONU indoor or outdoor

Protection possible50ms recovery

Service parameters

VoicePOTS, leased lines,

special services

Data10, 100, 1000Base-T

Ethernet

Other interfaces possible

VideoIP-video over data path

RF-video overlay

Lisbon, 25 February 2010 6

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

Distance20km physical reach

Support for power levelingMakes burst mode reception easier

FEC optionLoss budget / ONU optics cost down

Lisbon, 25 February 2010 7

Core G-PON TC layer (G.984.3)

A lightweight system that adapts both ATM and Ethernet to the PON’s TDMA natureDownstream frame

Bandwidth Map (PCB) – to manage the upstream ATM partition – to support legacy servicesGEM partition – to support packet services

Upstream burst transmissionPL-OAM, DBA, and protection included from the begining

Payload n

P-Frame Interval

PMF-TC Downstream

P-Frame Interval

TP-Frame

= 125 uS

PCBd

n+1

PCBd

n+2Payload n+1

PCBd

n

TDM & Data Fragments

over GFP Section

N * 53 bytes

"Pure" ATM cells

Section

Lisbon, 25 February 2010 8

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 9

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 extraneousQ2/15 has revised and narrowed the recommendations to reflect the marketPHY layer:

Rate: 2.5G down, 1.2G upLoss budget: 28 dB

TC layer: ATM partition droppedPower leveling deprecated

Lisbon, 25 February 2010 10

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 bySpecifying the blocking filter for G-PON ONU Rx’s

Specifying reduced upstream bands for ONU Tx’s

G-PON

X/S

1441 1450 1480 1500 1530 1539

7 dB

22 dB

Wavelength

(nm)

Narrow

G-PON

1260 1290 1300 1320 1330 1360

Wavelength

(nm)

Reduced G-PON

Original G-PON Spectrum

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Improve: Reach extenders (G.984.6)

The basic PON link is good for 20kmThis 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: 60kmTotal loss budget: 56 dB

ONU

ONU

ODN OLT

UNI

UNI

SNI

R/S

R/S

S/R

Mid-Span

ExtenderOTL

S'/R' R'/S'

Lisbon, 25 February 2010 12

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 Major chip vendors

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Major Application: Verizon FiOS

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

Office ParksSmall Businesses

Residential

|X|

Circuit

SwitchCopper

Feeder

Copper

Distribution

SAI

FDH

FTTP Overlay

OLT

New

Develop

ment

FDHFTTP Full Build

ONT

ONT

ONT

ONT

ONT

ONT

Small Businesses

ONT

ONTONT

ONT ONT

5.7

FiOS Internet Customers (M)

0.0

0.6

1.2

1.8

2.4

4Q06 1Q07 2Q07 3Q07 4Q07 1Q08 2Q08 3Q08

FiOS TV Customers (M)

0.0

0.4

0.8

1.2

1.6

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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So Far (~2008)

Large AN Sites

Multi-Layer Structure

Medium-Term (2008~2010)

OLT Centralized

Single-Layer 10GE Aggregation

Multi Service GW Convergence

Long-Term (2010~2016)

PON Extender for Remote Area

3-Layer Network Architecture

Fixed-Mobile POP Convergence

Backbone

Service POP

Metro

Access

Splitting

COSplitter

1~3Km

5~10Km

MSE BRAS SR VPN PE

Large Capacity AGG SW

PONExtender

Remote area

BRAS SR

…CR CR

10GE

GE/10GEMulti-Layer Agg.

n*GE

1-3Km1-3Km

1-3Km 1-3Km1-3Km

1-3Km 1-3Km

AN AN

ANAN

AN AN

…CR CR

k*10GE

n*10GE

m*GE/10GE

OLT

Splitter

…CR CR

k*10GE

S-GW MSE AGW

n*10GE

OLTCO

5~10Km

1~3Km

50~100Km

Splitter Splitter

1~3Km 1~3Km

G-PON enables network simplification

Lisbon, 25 February 2010

Thank You!

For more information, contact

Frank EffenbergerRapporteur Q2/15

Vice-chair, ATIS COAST-OANIEEE Comsoc TAOS std. liaisonfeffenberger<at>huawei.com