the asp is selected while the backplane bus is in the idle state after having been previously reset mx2 switches from outputting the logic 1 input on stms to outputting the present ptms backplane signal on stms since ptms is a logic 0 when the backplane bus is in the idle state the stms output changes from outputting a logic 1 to outputting a logic 0 during the connection process 2 if the asp is selected while the backplane bus is in the idle state after having been previously deselected while the backplane bus was in the reset state ptms is a logic 1 level in the reset state mux mx2 switches from outputting the previous ptms state logic 1 input on stms to outputting the present ptms backplane signal on stms since ptms is a logic 0 when the backplane bus is in the idle state the stms output changes from outputting a logic 1 to outputting a logic 0 during the connection process 3 if the asp is selected while the backplane bus is in the idle state after having been previously deselected while the backplane bus was in the idle state ptms is a logic 0 level in the idle state mx2 switches from outputting.