Blocking probability analysis for packet circuit emulation services

Standardization of pseudo-wire and circuit emulation services on IP packet networks is underway. The ability to quickly find circuits in networks supporting circuit emulation is directly computed using blocking probability analysis. When all of the sequenced flows have the same maximum packet size, i.e., they are homogeneous, blocking probabilities are computed using Erlang´s B formula. This paper describes analysis tools for the heterogeneous case and introduces the concept of steady-state fragmentation blocking probability, which controls the size of state transition diagrams used in the analysis. Simulation results using these tools are presented.