When this project wsa undertaken, the ALAX system was designed but was not built yet. Because it was too complicated for us to easily predict the detailed behavior of the system before we built it, we decided to use the OPNET simulation to evaluate the ALAX system before it was built. The performance of the ALAX could be predicted by analyzing the results of the OPNET simulation, and the optimal architecture of the ALAX developed by devising the proper number of transputers and the proper packet buffer size of the ALAX system.