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Analysis and applications of r-for N protection system

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2 Author(s)
Lu, K.W. ; Bellcore, Morristown, NJ, USA ; Liew, S.C.

The availability of a single member of a group of N functionally identical systems that work in parallel and share a pool of r backup systems is analyzed. These N+r systems, each with failure rate λ, are repairable, and there are m repairers available, each operating at rate μ. A Markov model is used to derive formulas for availability, mean time to failure, and mean time to repair for such a system. The analysis results indicate that by increasing r and decreasing ρ, the ratio of failure rate to repair rate, overall network availability is improved. It is shown that, for certain ρ's, some r:N pooled protections can significantly outperform 1:1 or 1:2 dedicated protection in terms of availability. The application of r :N protection to high-capacity transport systems is discussed, and it is indicated that multiwavelength systems may use additional wavelengths for protection. It is concluded that r: N protection can potentially provide both improved availability and significant cost advantages to the high-capacity transport systems

Published in:

Global Telecommunications Conference, 1990, and Exhibition. 'Communications: Connecting the Future', GLOBECOM '90., IEEE

Date of Conference:

2-5 Dec 1990