Ultra-Broadband Next-Generation Access Networks Dres. Klaus Grobe + Jörg-Peter Elbers, TNC2009, Málaga, June 2009

Ultra-Broadband Next-Generation Access Networks

Dres. Klaus Grobe + Jörg-Peter Elbers, TNC2009, Málaga, June 2009

© 2009 ADVA Optical Networking. All rights reserved. ADVA confidential.2

Agenda

Broadband Access and Energy Efficiency

NRENs with broadband Access

WDM-PON vs. P2P vs. Next-Gen GPON


Broadband Access andEnergy Efficiency


Applications and Requirements

Applications

Broadband access to (campus, university) sites (N x GbE, 10GbE, 40GbE)

Ultra-broadband connection between certain (DC) sites (N x 10/40/100GbE)

Application-specific requirements

Support respective ultra-high bit-rate protocols (10/40/100GbE, InfiniBand, FC)

Dedicated (high, guaranteed), secure bandwidths

Infrastructure requirements (in order to reduce energy consumption)

High maximum reach (up to 100+ km)

High per-client bit rates for respective number of clients

Keep it as simple and passive as possible

Optimized access network has high impact. Potentially, it allows to:

Eliminate sites incl. HVAC, or reduce complexity of sites

Eliminate / consolidate / integrate aggregation layers

Concentrate core L2/L3 functionality in fewer sites


As power demand grows, so does price, creating a double hit…

Energy Prices

Source: eia – Energy Information Administration, www.eia.doe.gov

Average Price of Electricity to US Industrial Customers

Source: http://epp.eurostat.ec.europa.eu/portal/page?_pageid=1996,45323734&_dad=portal&_schema=PORTAL&screen=welcomeref&open=/&product=Yearlies_new_environment_energy&depth=4

Average Price of Electricity to EU Industrial Customers

33%

42000 2001 2002 2003 2004 2005 2006 2007

Co

st [

Ce

nt/

kWh

]

5

6

7

10

2000 2001 2002 2003 2004 2005 2006 2007

Co

st [

Ce

nt/

kWh

]

32%

2

4

6

8

http://www.eia.doe.gov/

http://epp.eurostat.ec.europa.eu/portal/page?_pageid=1996,45323734&_dad=portal&_schema=PORTAL&screen=welcomeref&open=/&product=Yearlies_new_environment_energy&depth=4






Source: G. Epps, Cisco, 2007

Buffers, 5%

IP look-up andforwarding engine,

32%

Power / Heat management,35%

I/O, 7%

ControlPlane, 11%

Switch fabric, 10%

Power driver : IP look-up/forwarding engine

Always huge overhead for HVAC

(Heat, Ventilation Air Conditioning)

I/O – optical transport: lower in power

consumption than switch fabric, and

much lower than IP engine

Replace L3 by L2 – and L2 by optical transport where possible

Concentrate in high-density routers/switches (data centers)

Use wired – optical – access incl. point-to-multipoint solutions (PON)

Replace L3 by L2 – and L2 by optical transport where possible

Concentrate in high-density routers/switches (data centers)

Use wired – optical – access incl. point-to-multipoint solutions (PON)

Placing OSI Layers wisely


NRENs with broadband Access


Generic NREN

DC

DC

DC

DC

DC

DC

DC

DC

DC

Large, dispersed Metro Campus, orCluster of Campuses

DC

Core (Backbone) Router

Large Data Center

Layer-2 Switch

OXC / ROADM

Connection toBackbone (NREN)

Dedicated (P2P) Connection to large Data Centers

P2MP (WDM-PON) Connection within large Campuses, or to smaller Campuses

Redundancy


Flexible WDM-PON Options

Variable Bandwidth Assignment

ONU

ONU

ONU

RNOLT

1U/D

3U/D

nU/D

Ring Access (Protection)

ONU

ONU

ONU

RNOLT

Dual Homing (Protection)

ONU

ONU

OLT

OLT

RN

RN

ONU

Layer-0 active (Amplification)

ONU

ONU

ONU

RNOLT2U/D

OLT - Optical Line Termination, ONU – Optical Network Unit, RN – Remote Node


DC

DC

Broadband NREN Access – WDM-PON

Supports any bandwidth per wavelength – up to 100 Gb/s per lambda

Potentially, supports multiple wavelengths per client site

Can be complemented with protection, amplification, OAM (demarcation), and active integrated Ethernet

PoP

Flexible Remote Nodes

WDMONU

FRN

FRNWDM OLT

L2

ONU

NRENBackbone

OLT - Optical Line Termination , ONU – Optical Network Unit

ONU

ONUONU


Integrated Ethernet / WDM-PON

ONU

RemoteNode (FRN)OLT / PoP

...

I/F

L2

Sw

itch

Car

d

WD

M M

ux/

DM

XW

DM

Mu

x/D

MX

1+1/

1:1

Sw

itch

WDMWDM

WDMWDM Pas

sive

Cou

pler

WD

M M

ux/

DM

XW

DM

Mu

x/D

MXWork

Protect

WDMWDM

WDMWDM

...

WDMWDM

Common O+E Controller

EFM/VLANI/F

L2-WDM Switch Blade:Aggregation (incl. oversubscription) into 10GbE,Ethernet OAM, incl. Management channel (EFM),Possibly integrated EPON

Optical Line Switch OLT-PN:Alternative: Ethernet E2E protection

Common O+E Controller:Integrated management, provisioning, monitoring,Same Control Plane, single DCN

WDM:Direct core interworking,Scalability

Ethernet/WDM

ONU / CPE:Demarcation,OAM

AA

AA

WDM Amplification: Reach extension


WDM-PON vs. P2P vs. Next-Generation GPON


Point-to-Multipoint (P2MP) Access

+ Scalable and transparent bandwidth per customer

+ Highest security/availability due to physical/logical separation of customer links

– High fiber count in access network (i.e., high OPEX)

– High space and power consumption

PoP

PoP

Passive

Splitter+ Very low fiber count in feeder network part

+ Low port (interface) number, and space and power consumption in PoP

– Limited bandwidth and bandwidth upgrade

– Reduced security/availability in case of TDMA

– High insertion loss, low max. reach

PoP

WDM

Mux/Demux + Very low fiber count in feeder network part

+ Scalable and transparent bandwidth per customer

+ High security/availability due to optical/logical separation of customer links

– High port number in PoP equipment

Active P2MP

Splitter PON

WDM-PON


NG-GPON vs. WDM-PON

Splitter-based GPON, running at 10 Gb/s downstream (2G5…10G upstream) DWDM overlay (40/80 channels, 100/50 GHz or C-/C+L-band)

AWG-based WDM-PON, running any bit rate per wavelength DWDM 40/80 channels (SFW or DFW), more possible Simple EDFA amplification for high reach

FRN

OLT

GPONOLT

4-B

S

WDM GPON ONU

WDMFF

FF

2-B

S

SOA

SOA

DW

DM

DW

DM Flexible Remote Node

OLT

GbE

CPE

10GbE

FRN

AW

GA

WG

AW

GA

WG

EDFA

WDM

CPE


Power Budgets (WDM-PON, NG-GPON)

*) With EDFA-C-S20-GCB

**) With EDFA-C-D20-VGC and DCG dispersion compensation

Unamplified OLT amp* FRN amp**

Power budget 32.0 dB 32.0 dB 60.0 dBFilter losses 12.0 dB 6.0 dB 12.0 dBPatch cord/connector losses 0.9 dB 0.6 dB 1.2 dBOptical path penalty 2.0 dB 2.0 dB 3.0 dBSystem margin 1.0 dB 1.0 dB 1.0 dBLink budget 16.1 dB 25.8 dB 42.8 dBLink loss/km 0.3 dB 0.3 dB 0.3 dBLink length in km 53.7 km 74.7 km 142.7 km

OLT FRN

CPE

OLT FRN

CPE

OLT FRN

CPE

OLT FRN CPE

G1:64

FRN

Include Blocking Filters

GPONunampl.

WDMOLT ampl.

Power budget 33.0 dB 36.0 dBFilter and splitter losses 22.0 dB 27.0 dBPatch cord/connector losses 0.9 dB 1.2 dBOptical path penalty 1.0 dB 1.0 dBSystem margin 1.0 dB 1.0 dBLink budget 8.1 dB 5.8 dBLink loss/km 0.4 dB 0.3 dBLink length in km 20.3 km 19.3 km

36.0 dB22.0 dB0.9 dB1.0 dB1.0 dB

11.1 dB0.3 dB

37.0 km

WDMunampl.

GPONOLT ampl.

37.0 dB22.0 dB0.9 dB1.0 dB1.0 dB

12.1 dB0.4 dB

30.3 km

WDM-PON, DFW

NG-GPON

33 dB (10G): +4 dBm…-26 dBm + 3 dB FEC gain, 36 dB (2G5): +4 dBm…-32 dBm


Security / Availability Aspects

NG-GPON

Customers are not independent (coupled via MAC layer)

One faulty ONU may corrupt the entire TDMA PON

WDM overlay also broadcasted via splitter infrastructure

Not acceptable by certain applications

WDM-PON, active P2MP

Physical separation via wavelengths or fibers

No common MAC layer, complete separation of customers

Also: can be easily complemented by optical protection

Passive WDM Filter

WDMOLT


Cost Comparison

WDM-PON Active P2MP NG-GPON

EquipmentCapEx

Higher than active P2MP, similar to NG-GPON

Potentially, lowest Higher than active P2MP

Fibers Lowest fiber cost, supports site reduction due to high maximum reach

Higher fiber cost, but potentially high maximum reach

Low fiber cost, but limited in maximum reach

OpEx Lowest OpEx since application-specific solutions are avoided (also supports P2P WDM). Integrated aggregation, protection, OAM, L2 Eth.

Potentially high due to respective number of systems. Systems may also lack OAM and other capabilities.

Low for low-medium capacity requirements, but may require dedicated P2P solutions for high-capacity applications.

Energy Consumption

For any given product Bandwidth Distance, WDM-PON can minimize energy consumption

Typically, higher than WDM-PON, specially when amplified (discrete I/Fs, multiple amplifiers)

Only for short distances similar to WDM-PON, otherwise higher

Thank you

IMPORTANT NOTICE

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Documents

Ultra-Broadband Next-Generation Access Networks Dres. Klaus Grobe + Jörg-Peter Elbers, TNC2009, Málaga, June 2009