High availability path design in ring-based optical networks

This work develops mathematical models for path availability and provisioning resources required in various strategies for realizing high availability service paths in a transport environment of bidirectional line-switched rings or shared protection optical (wavelength division multiplexing) rings....

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Bibliographic Details
Published in:IEEE/ACM transactions on networking 1999-08, Vol.7 (4), p.558-574
Main Author: Grover, W.D.
Format: Article
Language:English
Subjects:
Assessments
Availability
Economics
Environmental economics
Mathematical analysis
Mathematical model
Mathematical models
Networks
Optical design
Optical fiber networks
Optical interconnections
Protection
Provisioning
Routing
SONET
Transport
Wavelength division multiplexing
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Summary:This work develops mathematical models for path availability and provisioning resources required in various strategies for realizing high availability service paths in a transport environment of bidirectional line-switched rings or shared protection optical (wavelength division multiplexing) rings. The work originated in response to user requests for SONET service paths with unavailabilities under 30 s/year. A number of schemes for redundant routing and ring interconnection are considered as options to meet such a demanding target in the most economic way. An analytical framework for comparison of various provisioning schemes allows a "cost effectiveness" assessment of four high-performance alternatives, in terms of total resource investment and the corresponding service unavailability relative to a single-fed path construction. The logical models of cost and availability can be used in a variety of SONET or optical-ring transport planning studies or perhaps in future automated provisioning tools. An important finding is that while the availability benefit of dual-ring interconnection is high in metro-ring networks, the availability of paths through long-haul ring networks may be relatively poor due to lower limits from two-failure intra-ring combinations.
ISSN:1063-6692
1558-2566
DOI:10.1109/90.793028