ftth conference 2011 workshop next generation optical access networks dirk breuer telecom.de

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Next generation optical access networks: the OASE view

Dirk Breuer, Erik Weis, Ralf Hülsermann, Mario KindDeutsche Telekom LaboratoriesGoslarer

Ufer

35, 10589 Berlin, Germanyemail: [email protected]

On behalf of the OASE project teamwww.ict-oase.eu

15.02.2011 2Deutsche Telekom Laboratories

© Deutsche Telekom AG Proprietary. All rights reserved. No part of this presentation may be reproduced in any material form without the written permission of the copyright owner.

OASE Integrating

projet on access

addressing

technology,

techno-econmics, business regulation, standards

WP2

Requirements

for European NGOA networks

1 Gbps

peak500 Mbps sustainable

1000 customers/feed

100 km transmission

WP5

Techno‐economic

assessment

WP6

Business modeling and regulatory aspects

WP7

Experimental

validation

Development and assessment of NGOA network architectures for the “2020”

time horizon focused on European requirements.

Technology and architecture evolution focusing on minimized total cost of ownership

Supporting new business models

Target:

1

Gbit/s

per customer

> 1000 customers per fiber

feed

> 100

km transmission distance

Development and assessment of NGOA network architectures for the “2020”

time horizon focused on European requirements.

Technology and architecture evolution focusing on minimized total cost of ownership

Supporting new business models

Target:

1

Gbit/s

per customer

> 1000 customers per fiber

feed

> 100

km transmission distance

Objectives



Access /aggregation network migration path

Migration towards FTTH FTTH

will remove the access bottleneck.

FTTEx

(ADSL2+) FTTCab

(VDSL2)

FTTB

FTTH ONT

Modem

DSLAMModem

MDU-

ONUModem OLT

OLT

Aggregation Network

Aggregation Network

Aggregation Network

Aggregation Network

DSLAM

Local Exchange Central Access NodeCabinetHome / Building

Access bit rate

Toda

yN

ear F

utur

e

FTTH --

Optical fiber access: No (practical) limitation in the access bandwidth.FTTH --

Optical fiber access: No (practical) limitation in the access bandwidth.



Access /aggregation network migration path

NGOA –

Reducing Total Cost of Ownership. Minimal TCO at still growing bandwidth.

FTTEx

(ADSL2+) FTTCab

(VDSL2)

OASE

FTTB

ONT

Modem

DSLAMModem

MDU-

ONUModem OLT

OLT

ONT

Aggregation Network

Aggregation Network

Aggregation Network

Aggregation Network

DSLAM

Local Exchange Central Access NodeCabinetHome / Building

OLT Agg. Net.

Access bit rate

Toda

yN

ear F

utur

e

FTTH



Principal interrelationship between network structure and costs in access/aggregation networks.

Find the optimal network structure enabled by optical technology

Site costs

Aggregation link costs

Feeder link costs

Number of Access sites

Total costs

Cos

ts

Optical Distribution Network /Customer Premises

Accesssite

PoP

OLT

Aggregationlinks

Feeder links

Acce

ssne

twor

kAg

greg

atio

nne

twor

k

OLT/AGS

Accesssite ODN costs



Identify architectures with potential for lowest total cost of ownership

NGOA architectures Identifying the optimal structure

Edge Node

OLT

NT2NT1

NT2

NT1

NT2

NT1

NT2

NT1

Optimal Location?

Local Exchange

Distribution Main

CabinetBuilding Central access node Core NodeHome

Regional Regional

First Mile Feeder AggregationInhouse

NGOA coverage designPON, WDM, AON, PtP, hybrid solution

cable cable cable cable

?



Identify system concepts that meet the requirements for next generation optical access

NGOA system technologies

Tree‐based FTTX

Power Splitter WDM SplitterHybrid (Filter +

Splitter)

UDWDM

Hybrid

WDM+XXM

Active

Ring‐based FTTX

Active RN

Mesh‐based FTTX

WDM Ethernet

Topology

Architecture

Technology OFDM CDM

Remote Node

(RN) Design

Patch panel

Realization /

Standard

CWDM

Passive

Shared (Feeder) Fiber InfrastructureDedicated Fiber Infrastructure

TDM

GPON

EPON 10G‐EPON

XG‐PON1 XG‐PON2

DWDM

SCM

Fiber

infrastructure

Which concept offers lowest Total Cost of Ownership?



Feeder link length. Which reach should be provided by NGOA systems?

Feeder links length ≤

40km for majority of households in all scenarios

Very long feeder links for a minority of households only

For total transmission distance subscriber line length in ODN has to be added (typically < 5km)

Typically about (<) 40 km reach are sufficient

Protection will require longer reach (2x)

Feeder links length ≤

40km for majority of households in all scenarios

Very long feeder links for a minority of households only

For total transmission distance subscriber line length in ODN has to be added (typically < 5km)

Typically about (<) 40 km reach are sufficient

Protection will require longer reach (2x)

Reach is not the challenge?Feeder link length = f(# metro access nodes)

GPON Reach

Extender

GPON C+B+

500 1000 2000 3000 40000

20

40

60

80

100

Feed

erLi

nkLe

ngth

[km

]

Number of Central Access Nodes

feeder link length(related to number of households )

95% quantile80% quantileaverage value

shortest backup pathshortest path



Feeder

link fiber

demand. The dark side of site darkening -

Additional cable required.

Feeder cables are an important additional cost factor

Feeder fiber demand depends on

Number of Central Access Nodes / Feeder link length

Feeder fiber multiplexing (splitting)

Resilience requirements

High splitting ratio is key to reduce additional feeder costs

Resilience has to be optimized

Feeder cables are an important additional cost factor

Feeder fiber demand depends on

Number of Central Access Nodes / Feeder link length

Feeder fiber multiplexing (splitting)

Resilience requirements

High splitting ratio is key to reduce additional feeder costs

Resilience has to be optimized

High splitting is required!Feeder fiber demand = f(# metro access nodes)

500 1000 2000 3000 4000104

105

106

107

108

109

1010

Feed

erFi

ber D

eman

d[F

iber

*km

]

Number of Access Nodes

point -to-point1:32 splitting ratio1:512 splitting ratioprotected feeder links unprotected feeder links

Total fiber

capacity

in Germany (BNA)

OASE



FTTH residential peak data rates ≥1 Gibt/s

Business, backhaul (fixed, mobile) peak date rate: ≥10 Gbit/s

Average sustainable downstream based on service usage during peak hour 500 Mbit/s

per Optical Network Units (ONUs)/customers

Support of traffic symmetry, at least a ratio of 1:2 between up-

and downstream

Support of 128 Gbit/s

up to 500 Gbit/s

aggregate capacity per feeder fiber

Mobile and fixed backhaul, residential and business access (SME)

on one platform

Mobile Backhaul: Low delay and high synchronization requirements

Key requirements on NGOA network architecture.

Peak data rate

Sustainable data rate

Feeder capacity

Universal access

Low power consumptionGreen network operation



Support of 256 up to 1024 ONUs

per feeder fiber

Support of 20 to 40 km passive reach option for the working path

Support of 60 to 90 km extended reach option for the protection path (preferably passive)

Support of redundancy and protection mechanism for service availability and reduced failure impact (e.g. limited number of affected customers)

NGOA system has to work on existing first mile infrastructure (single fiber solution)

NGOA system does not affect deployed systems and the existing used spectra

Key requirements on NGOA network architecture.

Split

Reach

Resilience

Migration



Market environment in Europe. A lot of new players are emerging.

Investors in FTTH/B in EuropeFiber roll out vs. other access technologies

EU-27**

UK

Italy

Germany

•*DT & BT until 2012, Telecom Italia until 2013•** includes Iceland and Norway

12%

22%

Incumbents

Municipalities/

Utilities64%

Alternative

Operators/ISPs

2%Housing companies and other

Source: IDATE for Fibre-to-the-Home Council (2010)

xDSL coverageCable modem coverage3G+ coverageCoverage fibre by incumbent*Installed FTTB/H connections



New players on different network layers

Fragmented ecosystems will emerge. Chances for co-operations.

wavelength

content

application

end2end

IP

ethernet

fiber

duct

trench

RoW

access (first and second mile)backbone

Physical Infrastructure Provider (PIP)

Network Access Provider (NAP)

Regional Network Provider (RNP)

Service Provider (SP)

Connectivity Provider (CP) OSI-layersWholesale Wholesale

Wholesale Wholesale

DuctsConnection (Fiber)

Connection (Wavelength)Connection (Ethernet)

Connection (IP)

Technical Interfaces

Transaction costs

Deutsche Telekom Laboratories


15.02.2011 1414

Thank you!

Dirk [email protected]

OASE project (www.ict-oase.eu)

“The work leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement n°

249025”

mailto:[email protected]

ftth conference 2011 workshop next generation optical access networks dirk breuer telecom.de

Technology

access bandwidth

access bottleneck

optical fiber access

written permission

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