ANALYSIS AND DESIGN OF SURVIVABLE TELECOMMUNICATIONS NETWORKS

The analysis and design of mesh restorable and self-healing ring netwo rks is considered. A general class of traffic-based survivability meas ures to analyse telecommunications networks is proposed. These measure s calculate the average traffic-carrying capability of a network over all possible failure states. Traffic-based survivability measures are proposed to analyse mesh networks with and without restoration scheme. For the design of mesh restorable networks the network configuration and working capacity assignment are combined to minimise the cost befo re restoration is added into the network. Path restoration in spare ca pacity assignment is considered. A joint approach that combines config uration, working and spare capacity assignments altogether is addresse d. A new architecture is proposed called the dual-homing hierarchical self-healing ring (DH-HSHR) architecture to interconnect self-healing rings. A heuristic algorithm for single-homing HSHRs is modified to fi nd near optimum DH-HSHR configurations. Numerical results are given an d the two restoration strategies, mesh and ring, compared in terms of survivability and cost.