Model of calculating difficulty of new generation optical commutation systems

The article presents the analysis of various circuits of the multistage switching systems and their main characteristics. The model of calculating the complexity of the new generation optical switching systems based on $4\times4$ switches has been developed. These switching systems have a new property, which no one multi-stage scheme possesses: the strict non-blocking capacity with parallel data transfer and arbitrary packet swapping. There has been compared the difficulty of the proposed systems, such as the switching difficulty of the base element and the diameter with well-known multi-stage schemes. The analysis showed that the optical switching systems of the new generation have an advantage — a fewer number of cascades.