A Uniied Approach to Network Survivability for Teletraac Networks: Models, Algorithms and Analysis

| In this paper, we address the problem of network survivability by presenting a uniied approach where the wide-area circuit-switched teletraac network and the underlying transmission facility network are considered simultaneously. We assume the backbone circuit-switched teletraac network to be nonhierarchical with dynamic call routing capabilities. The transmission facility network is considered to be sparse (as is observed for emerging ber optic networks) and is assumed to be two-arc connected. Our approach addresses the network survivability objective by considering two grade-of-service parameters: one for the traac network under normal operating condition and the other for aaected part of the network under a network failure. We present uniied mathematical models and develop heuristic algorithms. We then present computational results to demonstrate the eeectiveness of the uniied approach.