AbstractIn multimedia telecommunication, multidimensional traffic is formed, where signals such as voice, data and image exist on the same system. It is known that the traffic characteristics are different in such a case from those of the one‐dimensional traffic based on telephone calls. However, no quantitative study has been made on such traffic characteristics. This paper considers the two‐dimensional traffic of the loss system where two classes of calls exist: basic and wide‐band. The loss characteristics are derived and provide a guide for the design including wide‐ban