In one embodiment of a communications network, the predetermined encoding scheme and symbol constellation configurations are chosen so that the range in channel qualities that the encoding scheme and symbol constellation configurations are designed to be utilized within overlap with each other. They also inhibit preventively the pathophysiological processes associated with the development of ischemia-induced damage, especially in the triggering of ischemia-induced cardiac arrhythmias. The body terminal is arranged on the body projection and configured not to project further than the slope, to be exposed to outside from a portion other than the slope, and to contact the contact terminal inside the guide portion when the body projection is inserted thereinto. The lever arm is pivotally attached to the instrument body and is pivotal between a first position, a second position and a third position. Electrical energy may be generated by the movement of the one or more trolleys along the track. The present invention reduces the EMI.