Carrier grade high availability platforms are designed to enable the development and deployment of highly available services in the telecommunications i n d u s t y . I n order t o build-in high availability and compare availabilities that differ in the sixth decimal place during the design phase, fairly detailed stochastic models are needed t o evaluate the design and perform design trade offs. Thas paper describes a n availability model for a high availability platform using three-level hierarchical decomposition that mixes reliability block diagrams and Markov chains. T h e model i s built and evaluated using the S H A R P E software package. Sensitivity analysis is performed t o identify the effects of critical parameters.
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