Resilience with Tailored Recovery Time in Switched Optical Networks

The introduction of switching capabilities and signaling based distributed intelligence enable to implement advanced and effective resilience schemes in optical transport networks. Assuming an optical transport layer with intelligent flexibility, resilience schemes are to be implemented in a distributed environment, and several operational oriented considerations should be taken into account to specify the proper recovery strategy. The paper presents a brief overview and some numerical results to analyze the potential solutions. The new networking capabilities enable the differentiation of transport services from resilience points of view, as well. Some transported services may survive capacity degradations, however others require full recovery. In case of a failure, besides the amount of recovered capacity, requirements originated from different client services can be distinguished according to the time to recovery, as well. Fundamental recovery schemes like 1+1 dedicated path protection and optimal capacity sharing based path restoration do not enable the tailoring of the recovery times. Resilienc