CONTROL ALGORITHMS OF SONET INTEGRATED SELF-HEALING NETWORKS

As the deployment of high-speed fiber transmission systems has been ac celerated, they are widely recognized as a firm infrastructure of our information society. Under this circumstance, the importance of networ k survivability has been increasing rapidly in these days. In SONET, t he self-healing networks have been highlighted as one of the most adva nced mechanisms to realize SONET survivable networks. Several schemes have been proposed and studied actively due to a rapid progress on the development of highly intelligent NE's. Among them in this paper, a D CS based distributed self-healing network is discussed from a viewpoin t of its control algorithms. Specifically, our self-healing algorithm called TRANS is explained in detail, which possesses such desirable fe atures as providing fast and flexible restoration with line and path l evel restoration applied to an individual STS-1 channel, capability to handle multiple and even node failures, and so on. Both software simu lation and hardware experiment verify that TRANS works properly in a r eal distributed environment, the result of which is shown in the paper . In addition, the combined use of TRANS and the ring restoration cont rol is proposed taking into account the use in a practical SONET.