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Advent of 10G Asymmetric EPON

BIN YEONG YOON, ETRIGABRIEL SHIN, CMB

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Contents

Killer application of FTTHEvolution of EPON considering future IPTV servicesIssues on IPTVConclusions

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Broadband Subscribers of KoreaBroadband deployment of 65% penetration Optical LAN is on increaseCable modem and xDSL are staggeringThere is no room for EPON due to no killer application

LANCable Modem xDSL

0

2M

4M

6M

8M

10M

12M

14M

2002.5 2003.5 2004.5 2005.5 2006.5

Num

ber

of S

ubsc

ribe

rs

0.6M

4.9M

3M

1M

6.2M

3.8M

0.9M

6.6M

4M

1.2M

6.7M

4.3M

2.1M

6.4M

4.2M

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IPTV would be a saviorKiller application is needed to spur the deployment of EPONIPTV can be one of the candidates

Delivery of both broadcast and on-demand TV and video services using Internet protocolIPTV services value will be increased sharply

IPTV Revenues in North America (Ovum, 2006)

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Multi-vision ServiceMulti-channels popped up on the screen simultaneously like browsers on PC

Current IPTV Current IPTV

Headend Headend

InternetInternet

1Gbps 1Gbps ONTONT

OLT OLT

Single VisionSingle Vision

Headend Headend

InternetInternet

10 Gbps 10 Gbps ONTONT

OLT OLT

Future IPTVFuture IPTV

Multiple VisionMultiple Vision

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Multi-angle serviceMore bandwidth required to provide multi-streams per channel

Streaming SurfingSBS Golf

5 Multi-angled ServiceAngle 1Angle 1 Angle 2Angle 2 Angle 3Angle 3

Angle 4Angle 4 Angle 5Angle 5

Angle 2

Angle 1

Angle 4

Angle 3Program Provider

StreamingSurfing

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Number of channels increased

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Evolution of EPON

Evolution of EPON Broadcast BandwidthUnicast BandwidthBandwidth allocationImpact on home networks

More Bandwidth will be required for future IPTV services

Multi-vision serviceMulti-angle serviceNumber of channels increased

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Evolution of EPON Technology

PSOLT 1Gbps UPSTREAM

PSOLT10Gbps DOWNSTREAM

OLT10Gbps DOWNSTREAM

PS

1Gbps DOWNSTREAM

1Gbps UPSTREAM

10Gbps UPSTREAM

Step III : 10Gbps/10Gbps(DS/US)Cost effective system by more subscribers & more bandwidth for US

Step I : 1Gbps/1Gbps(DS/US) The first commercial FTTH technology with Gigabit bandwidth deployed in the world

Step II : 10Gbps/1Gbps(DS/US)Advanced digital TV services & CATV replacement

Single VisionSingle Vision

Multiple VisionMultiple Vision

Multiple VisionMultiple Vision

ONU

ONU

ONU

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Broadcast Bandwidth

PC

TV

PP

ISP

SO(ONU)

(TBA)(Tap-off)

(Splitter)

Fiber

Cable

QAMmodulator

QAMmodulator

CMTSRouter

HFC network

STB

CM

CableSTB

Ch1 (f1)

Ch135 (f135)

Ch4 (f4)

RF modulationRF modulationCh4(fCh4(f44))

5~42MHz5~42MHz 88~550MHz88~550MHz 550~860MHz550~860MHzAnalogue CHAnalogue CH Digital CHDigital CH

~ 5 Gbps(Downstream)

Theoretically, DS bandwidth up to 5Gbps for broadcast servicesSeveral hundred Mbps of data services by channel bonding of Data Over Cable Service Interface Specification 3.0 (DOCSIS 3.0)

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Unicast BandwidthThe ratio of downstream to upstream: Symmetry or Asymmetry ?

Current State ⇒ slight asymmetry (~ 2:1)Peer to peer (P2P) service is dominant

Future Trends ⇒ severe asymmetryRevenue generating BW is downstreamAsymmetrical HFC capacity: ~ 22:1

30Mb/s

150Mb/sToday

IP T

rans

it C

apab

ility

Spectrum Required6 MHz 30 MHz

Upstream

40Mb/s

5.0Gb/sToday

IP T

rans

it C

apab

ility

Spectrum Required6 MHz 750 MHz

DownstreamDOCSIS 3.0 DOCSIS 3.0

Source: M. Fawaz, CableLabs Media Briefing, 2005

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Allocation of Bandwidth for 10G Asymmetric EPON

PS

Program Provider

Internet

On-demandSever

OLT

ONT

ONT

ONT

IPTV

EoD, VoD, SoD etc.

On-demand, etc. (2.5Gb)

Internet (2.5Gb)

Broadcast (5Gb)

Internet (1.25Gb)

Downstream(10Gb)

Upstream(1Gb)

Revenues generating BW is downstream BW

Upstream BW: Existing services (1.25Gb: Internet, VoIP etc.)Downstream BW: Existing services(2.5Gb), broadcast(5Gb), Services generating revenues (2.5Gb: video streaming services, etc.)

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Impact on home networks

L2 SWAV Bridge

1GBASE-T

10GBASE-TTransceiver

ONT 10GBA

SE-T

100BASE-TL2 SW

Video signal

Triplexer

ONT

1G EPON1G EPON 10GEPON10GEPON

10G EPON triggering business of new technologies such as AV Bridges (Residential Ethernet) and 10GBASE-T Getting rid of coaxial cable for video signal

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Issues on IPTV Services

Issues on IPTV servicesChannel zapping delayConfigurations of networks

Evolution of EPON Necessity of 10G asymmetric EPONAsymmetric internet trafficBandwidth allocationImpact on home networks

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Channel Zapping DelayChannel Zapping Delay is

A matter of how quickly end user can change channelsA matter of how quickly end user can change channelsMajor source of channel zapping delay is multicast leave & join latencymulticast leave & join latency

Multicast signaling: IGMP for IPv4 or MLD for IPv6• IGMP: Internet Group Management Protocol• MLD: Multicast Listener Discovery

Channel Zapping Delay = Selected channel traffic received time [t2]

− IGMP leave message for previous channel transmitted time [t1]

Previous channel multicast traffic

IGMP Leave for previous channel

IGMP Join for selected channel

Selected channel multicast traffic

Channel Zapping Delay [t2 – t1]

IPTV STBNetwork

Equipment

Channel Select t1

t2

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Case Studies of Channel Zapping Delay

Zapping time between 2 channels at ADSL based IPTV service: 2 ~ 5 s

Comparative study of 3 operators in France in July 2004 (Source:http://www.01net.com/article/248891.html)

Test of Channel Zapping time on condition of large subscribers

Tested by Agilent Technologies in order to evaluate channel zapping performance when many subscribers zap channels simultaneouslyZapping delay is about 0.9 ~ 70 s depending on configurations ofsubscribersincreased number of subscribers dramatically affects the channelzapping delay

(Source: Agilent Technologies “Testing IPTV channel zapping”)

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To suppress the channel zapping delay for 10G EPON:It is required to reduce the number of subscribers that try to zap the channel at the same time

Suppressing Options of Channel Zapping Delay

Option 1Option 11G EPON with FE port at ONT

# of IGMP signals from all users: ~ 5,000

Option 2Option 210G EPON with GE/FE port at ONT

# of IGMP signals from ONT/ONU users: ~ 32

Option 3Option 310G EPON with 10G port at ONT

No IGMP signalsChannel zapping as fast as CATV

ONTSTB OLT MR

Selected channel

IGMP leave/join

ONTSTB OLT MR

ONTSTB OLT MR

Broadcast channel

1G EPONFE

10G EPONGE/FE

10G 10G EPON

STB: Set Top Box, MR: Multicast Router

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1G EPON for IPTV

Configuration of 1G EPON access network for IPTVComplex networksComplex traffic management of individual IPTV channelsIGMP neededAuthentication against a channel join attackHigh cost of network management

ONTSTB

TV

Internet

IPTVHeadend

VoIPOLT Edge

Router

Encrypted IPTVIGMP join/leave

AuthenticationServer

1G EPON

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ONTSTB

TV

OLT EdgeRouter

Encrypted IPTV

10G EPON

Internet

IPTVHeadend

VoIP

10G EPON for IPTV10G EPON for IPTV

Configuration of 10G EPON access network for IPTVSimple networks like CATVEasy traffic management of just one single virtual path containing all broadcast channelsNo IGMPLow cost of network management

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Necessity of 10G Asymmetric EPON 10G EPON can support TPS better than any other access technologies

Reducing channel zapping delayAvoiding complex networks to support QoS of broadcast services

DS traffic should be increased for future broadcast servicesMulti-visions, multi-angles, and number of channels increasedMore than 5Gbps allocated for broadcast to keep the same bandwidth as CATV

US traffic of customers not allowed to be increased dramaticallyNo high revenue expected from increasing US user traffic

Reasonable costCurrently, cost of 10G symmetric EPON system is too expensive to be deployed, compared to 10G asymmetric EPON

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ConclusionsIPTV service value will be increased 10G asymmetric EPON well suitable for IPTV

Huge 10Gbps DS bandwidthReducing channel zapping delay Simple access networks

Winner or loserCATV trying to increase Internet bandwidth by DOCSIS 3.0FSAN starting to discuss10Gbps GPON on Sep.Optical LAN increased with low cost and easy migrationxDSL exceeds the average bandwidth of 1Gbps EPON per subscriber