17575_03_2003 © 2003, Cisco Systems, Inc. All rights reserved.

Optical Networking: From Photons to PacketsRajiv Ramaswami VP/GM Optical Technology Group

© 2003, Cisco Systems, Inc. All rights reserved. 27575_03_2003

Optical Post Bubble

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Outline

• Network evolution

• Where are core networks headed?

• Where are metro/access networks headed?

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Networks in TransitionToday: Service Specific Networks

Narrowband Access Network

Broadband Access Network

Radio Access Network

SONET/SDHAccess Network

High Speed (Ethernet)Access Network

Voice Network(Circuit)

TDM Network(Circuit)

FR/ATM Network(Packet)

Public IP Network(Packet)

Private IP/MPLS Network(Packet)

Optical Network(Circuit)

Challenges:

• Capex

• Opex

• Service Velocity

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Networks in TransitionFuture: One Network, Many Services

Broadband Access Network

Radio Access Network

2.5G/3G/4G/WLAN

SONET/SDHAccess Network

High Speed (Ethernet)Access Network

TDM Network(Circuit)

Public

Private

IP/MPLS Network

Optical Network

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Access and core Networking:End-End Data Delivery

SONET/SDH Loop Ethernet Core / EoMPLS SONET/SDH Loop

Se

rvic

e E

nd

Po

int

(Cu

sto

me

r, En

terp

rise

, SM

B)

Se

rvic

e E

nd

Po

int

(Cu

sto

me

r, En

terp

rise

, SM

B)

COCO

SONET/SDH Loop Ethernet Core / EoMPLS SONET/SDH Loop

Se

rvic

e E

nd

Po

int

(Cu

sto

me

r, En

terp

rise

, SM

B)

Se

rvic

e E

nd

Po

int

(Cu

sto

me

r, En

terp

rise

, SM

B)

COCO

Core NetworkAccess Network Access Network

• Core networks: IP+WDM• Access Networks: NG SONET/SDH with packet integration• Boundaries between packet and optical blurring• Consistent interworking across optical and packet layers

NG SONET NG SONETWDM

IP/MPLS

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Optical in the Network Core

Reconfigurable optical WDM layer with optical bypassO/E/O minimized---capex/opex reductionSwitching for automated connection provisioningSONET-like look and feel

Direct connections between routersSONET largely irrelevant

Router

Router Router

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Integration between IP and Optical In the Core

End-to-end optical layer onto which TDM, IP & wavelength services converge

1. Colored tunable interfaces directly on the router

2. A switched optical convergence layer

3. Integrated management

4. Integrated control plane

Router Optical Layer

Unified Control Plane

Unified Management

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Legacy DWDM Systems:Manual DWDM Network Life-Cycle

ComplicatedNetwork Planning

Manual installation, manual power measurements and VOA tweaking at every site for every wavelength

Labor-intensiveoperation

Manual provisioning of optical design parameters

Manual provisioning of equipment & topology into EMS/NMS

Manual DWDM processes: labor intensive and error prone Result: high OpEx costs

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Next Gen Optical LayerAutomated DWDM Network Life-Cycle

Automated optical layer for end-to-end connection setup;

Manual patching of client at end-points only

Automated provisioning of all parameters

EMS/NMS learns from the network and stays in sync

Automated DWDM: simplified TDM-like installation and on-going operationResult: Reduces OpEx, facilitates wide deployment

Easy planning with

sophisticated tool

Simplified, graphical A-Z lightpath provisioning &

trouble shooting

Easy changes to design based on actual fiber plant

Automated end-to-end lightpath setup

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Next Gen Optical LayerEnabling Technologies

Automated optical layer for end-to-end connection setup;

Manual patching of client at end-points only

Easy planning with

sophisticated tool

Simplified, graphical A-Z lightpath provisioning & trouble shooting via CTM

Planning & simulation tool

Sophisticated EMS

Auto Node Setup

ROADM

Auto Power Control

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Metro/Access Network Evolution:Services and Transport technologies

FCGE

10/100E1/3

DS-1/3

ESCON

STM-n10GE OC-n

Data Voice Storage

NG SONET/SDHRPR

MPLSDWDM/CWDM

DataVoiceServices:

SONET/SDH

Transport:

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Delivering Data Services

Access Rings Office Interoffice Rings PoP

TDMTDM

TDMTDM

Access Rings Office PoP

TDMTDM

TDMTDM

New build versus … integrate data into TDM infrastructure

Option A: Overbuild for New Services

Option B: Integrate New Services onto NG SONET

Interoffice Rings

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Hub office / PoPEnd office

Cross-Connect

ADM

Today’s Network:Transport is not aware of service layer

Router

Chan10G

DS3DS1

DS1DS0

DS3 (TDM container)DS1

DS1

DS0

Customer A

Customer B

Customer C

ADM

Chan10G

DS3DS1

DS1DS0

DS3 (TDM container)DS1

DS1

DS0

Customer D

Customer E

Customer F

Low utilization from Customer site is carried all the way to the POP

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End office

Multi-Service Access

MSA

Tomorrow’s Network:Service aware transport

Multi-Service Edge

Router

Non-chan 1GE

MPLS Pseudowire

Customer A

Customer B

Customer C

MSACustomer D

Customer E

Customer F

Packet aggregation at each stage improves utilization & density by 10x

Non-chan 1GE

MPLS Pseudowire

Hub office

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Summary

YesterdayYesterday

• Optical and IP separate

• NG SONET with L1 Ethernet

• Manually intensive WDM

TomorrowTomorrow

• Ethernet/MPLS into optical

• WDM into routers

• NG SONET with L2 Ethernet, SAN, RPR, WDM

• Plug and play, reconfigurable WDM

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