A function-expansion device is detachably connected to electronic equipment to expand functions of the electronic equipment. In an implementation, a method includes forming a plurality of reports by a plurality of nodes in a network, wherein each of the reports is formed by a respective one of the nodes and includes trace data obtained from the respective node and another of the nodes. In another embodiment, the synchronous filters are programmable so as to change the filter sampling time. The adjustment passage is positioned angularly to the axis.