Improved survivability analysis for SONET SHRs

A special type of Markov model called parametric state reward Markov model (SRMM/p) and a set of survivability metrics comprising reliability, availability, and restorability were proposed for the evaluation of self-healing SONET mesh networks. The SRMM/p accommodates multiple consecutive link failures and uses topology-free approximation in order to calculate the average performance loss due to a failure. The SRMM/p is equally applicable to the analysis of self-healing SONET rings by considering a ring as a special case of a mesh topology.