An apparatus and a method for performing a time shift function according to a current call connection state are disclosed. The system includes a data acquisition component, a power analytics server and a client terminal. This solution is then sent through a second packed column containing glucose isomerase and finally a third packed column containing mutarotase. The first trace is disposed on the body, and at least a portion of the first trace is disposed in the first region. A DSP of system is previously trained using known analog signals and a model relating inputs to error outputs of analog circuit is previously known.