During generational change of exchanges, small relatively old exchanges previously working independently according to their own data banks are replaced by remote switching units. Due to this, it is possible to set an optimal FFT timing irrespective of the condition of a channel. In other examples, the boost device may be configured to provide additional energy for excitation of species. If no suspicious is detected, the remote supervision server will store the analysis result and send a notification to the case officer. The guiding block is installed slidably in the guiding groove. The present invention also relates to a method for composing a series of satays.