An automated transaction machine includes a computer coupled with a financial transaction network. The Schmitt trigger test circuit includes switches for reconfiguring the Schmitt trigger for testing by shorting the input and output terminals of an inverter and by opening a feedback path to allow the application of test voltages to the gates of feedback transistors coupled to the inverter. Based on signal levels obtained from physical quantity detecting parts and the temperature detecting part via the AD converter so as to correspond to a plurality of temperatures in a predetermined temperature range, which have been stored in the storage part, a signal level obtained from the physical quantity detecting part via the AD converter is corrected in the signal processing part. The bandwidth allocation for transmission of the calls and the admission of calls is based upon actual bandwidth usage conditions in the system.