Fault location method and test for WDM all-optical networks

Abstract

Fault location in WDM all-optical networks is a very important problem in practical network operation and administration. In this paper a simple and efficient method based on causal chain and set theory is proposed for the problem of fault location according to the current alarms in one network. A detailed fault location algorithm for single point fault is implemented based on the algorithm theory mentioned above. This method combines the network configuration model with the network fault model using object-oriented idea. Some tags and attributs related to fault and alarm are extended in configuration model which reduces the memory space and quickens the seeking. A WDM all-optical network connection management system using this algorithm is applied to a three-node WDM network. The testing results show that the proposed algorithms are correct and feasible. The average time for fault location is 9 seconds and the average time for restoration is 14 seconds.