1. Metro/regional optical network architectures for Internet applications Per B. Hansen, Dir. Bus. Dev. Joint Techs Workshop July 18, 2005

2. 2 © 2005 ADVA Optical Networking. All rights reserved. Outline  Research & Educational network needs  Statically and dynamically routed networks  Opposing demands driving the need for hybrid solutions  Extending CWDM/DWDM hybrids to static/dynamic  Mapping requirements to network architectures  Summary

3. 3 © 2005 ADVA Optical Networking. All rights reserved. Research & educational network needs User characteristicsTraffic characteristics Power users Ethernet applications (Internet, E-mail, VoIP, server access,…) Steady growth Dependent of faculty and student growth rate Mostly hubbed Large fraction to few application servers Super users Department/project-driven high-capacity apps. Variable need Limited predictability Temporary: 6 months to few years Hubbed or meshed Depending on dept./project partners Backbone traffic Infrastructure requirement driving capacity deployment Steady growth Aggregation of many sources Growth dependent on demographics in general Point-to-point Through/express traffic between two gateways

4. 4 © 2005 ADVA Optical Networking. All rights reserved. Network and traffic examples Point-to-point Linear add/dropRing Westbound backbone gateway Eastbound backbone gateway Hubbed Meshed Network connectivity Traffic example

5. 5 © 2005 ADVA Optical Networking. All rights reserved. Applying traffic estimates Optimizing cost/benefit  Assign static routing to min. estimated capacity needs  Support uncertain needs with dynamic routing when required Probability Capacity Best est. Max. est. Min. est. 100% StaticDynamic

6. 6 © 2005 ADVA Optical Networking. All rights reserved. Flexible network infrastructure static routing in multi-service WDM rings  Rapid capacity and distance extension  Cost-efficiency through integrated TDM  Multiple protection options  All data, storage, voice, and video applications–both legacy and next-gen FSP Management Suite Ethernet SONET/SDH Ethernet SONET/SDH Video  Wavelength group add/drop granularity  Optional group amplification for express traffic

7. 7 © 2005 ADVA Optical Networking. All rights reserved.  Flexible add/drop/through routing of channels  Mandatory amplification for express traffic Flexible network infrastructure reconfigurable routing FSP Management Suite Ethernet SONET/SDH Ethernet SONET/SDH Video  SONET-like OAM  Simplified network planning and engineering  Remote wavelength provisioning  Increased support for mesh and optical shared protection

8. 8 © 2005 ADVA Optical Networking. All rights reserved. Cost of transponder idle time Example:  Hub connecting to 4 satellite sites  6h of 10 Gb/s to each of 4 sites  P OC-48 /P OC-192 = 3 1 shared OC-192 4 dedicated OC-48s Dedicated lower-speed s:  P = 8xP OC-48  Wavelength usage: 2 Time-share single-:  P = 5x3xP OC-48 = 15xP OC-48  P = 6xP OC-48 with card relocation  Wavelength usage: 1

9. 9 © 2005 ADVA Optical Networking. All rights reserved. Flexible network infrastructure system evolution simple, predictablecomplex, unpredictable Network complexity unpredictable traffic growth Static  Fixed filters  SFP  Pre-configured Static  Fixed filters  SFP  Pre-configured Dynamic  ROADM  Tunable lasers  GMPLS Dynamic  ROADM  Tunable lasers  GMPLS Cost CAPEX and OPEX CAPEX only

10. 10 © 2005 ADVA Optical Networking. All rights reserved. Static & dynamic Static WDM advantages Dynamic WDM advantages  Lower 1 st installed costs (savings > 50%)  Lower equipment cost/service (savings > 50%)  Simpler installation & maintenance  CWDM & DWDM flexibility  Increased planning flexibility  Faster incremental service turn-up  Simpler service upgrades  Shared protection and mesh topologies Lowest service costs CAPEX Highest provisioning flexibility OPEX CAPEX: Capital ExpenditureOPEX: Operating Expenditure Hybrid

11. 11 © 2005 ADVA Optical Networking. All rights reserved. Hybrid/modular architectures  Full-band support in single device  Static vs dynamic may be optional – but an either/or decision  All switching cost at first install  Partial-band support per device  Static vs dynamic may be optional – but an either/or decision  Switching cost deferrable but no technology savings options  Partial-band support per device  Static/dynamic customizable to demand  Switching cost deferrable with additional technology savings options HYBRID MODULAR SINGULAR

12. 12 © 2005 ADVA Optical Networking. All rights reserved. CWDM/DWDM hybrid platform as an enabler  Wavelength multiplex separates traffic between user groups and overcomes capacity bottlenecks  CWDM solutions significantly decrease the initial investment  Hybrid CWDM/DWDM solutions provide unique scalability Total cost Number of wavelengths DWDM CWDM 18 CWDM/DWDM Hybrid DWDM allows for capacity growth 4 CWDM reduces first-in cost -50%

13. 13 © 2005 ADVA Optical Networking. All rights reserved. The real scalable platform Relative cost Scalability and complexity CWDM-DWDM hybrid Static/dynamic hybrid Dynamic DWDM Static DWDM CWDM Leveraging the right technologies with hybrid migration

14. 14 © 2005 ADVA Optical Networking. All rights reserved. Mapping requirements to architectures Traffic characteristics A scalable hybrid network implementation Steady growth Point-to-point Highest bandwidth at lowest costs  Static routing of high-traffic demands  Maximizing bandwidth per $ Granular provisioning on request  Dynamic routing of frequent temporary demands  UNI/NNI ready Steady growth Mostly hubbed Variable need Hubbed or meshed

15. 15 © 2005 ADVA Optical Networking. All rights reserved.  Networks experience a range of opposing demands  Lowest cost of first install – lowest threshold to getting a service  Maximizing utility – providing a service to all users within budget  Maximum bandwidth – the biggest pipe for the money  Option for advanced features – the problem of saying “no” and “never”  …  Opportunities for optimizing a network design by  Recognizing network topology  Recognizing traffic demands with degrees of predictability  Architecting a network solution that leverage that knowledge  A tool for all tasks: a hybrid network platform that supports a wide range of technologies from static CWDM to dynamic DWDM. Summary

16. 16 © 2005 ADVA Optical Networking. All rights reserved. Thank you phansen@advaoptical.com