Blocking probability approximation in circuit switched based optical networks

We consider an optical network that uses various circuit-switching based technologies such as OCS and OFS. We model it as two-priority circuit-switched network with non-hierarchical alternate routing. We evaluate the blocking probability using algorithms based on the Erlang Fixed-point Approximation (EFPA) and the Overflow Priority Classification Approximation (OPCA). For a particular example of a 6-node fully meshed network with alternate routing, we compare numerically between OPCA and EFPA and discuss traffic implications.