any over current fault an attention indicator such as light emitting diode led 120 associated with each hot plug slot calls the operator 39 s attention to a particular hot plug slot when that slot is being serviced the hot plug bridge 110 connects host interface bus 118 of a host system to the pci local buses 102 each pci local bus may have multiple hot plug slots 104 attached to it through bus signal isolation devices such as field effect transistor fet switches 116 each pci hot plug slot 104 must also connect to the system power supply 122 through slot specific power fet switches 114 the power fet switches 114 are controlled by the slot specific power controller 108 pci adapter cards not shown which plug into the hot plug slots 104 are limited to a maximum load and decoupling capacitance on each supply voltage the hot plug controller 106 commands the power controller 108 to turn the power fet switches 114 on or off the power controller 108 ensures that the supply voltages rise at a rate between a specified minimum and maximum slew rate of the pci hot plug specification by controlling the turn on of the fet switches in fig2 an enhanced pci hot plug system 200 has only one adapter card slot 204 attached to each pci local bus 202 eliminating the bus signal fet switches 116 the slot specific power controller 108 and the hot plug controller 106 from the conventional system 100 shaded boxes in fig1 the enhanced system 200 also has over current and voltage range detection op amps 206 a replacement power fet switch 210 and a 2 5 volt reference.