If a mobile terminal A requests a call connection to a fixed terminal B which can accommodate a plurality of channels, connection is established between the fixed terminal B and mobile terminal A via one channel. For example, if Node A sends message 3 towards Node B and, shortly thereafter, Node B sends message X to Node A, Node A would like to know whether or not message X reflects Node B’s state after receiving message 3. Under the disclosed operating conditions, the process proceeds without deactivation of the catalyst, and without the formation of a significant amount of cracking products, such as methylcyclopentane. A metal chassis panel is attached to cover at least the left and right surfaces of the metal structure. A high resolution reproduction apparatus reproduced both the first and second interleave blocks, so that a high resolution picture is obtained.