Status of the B power to the shelf. On systems with multiple power sources, this entry represents the -48 Volt DC power-supply status. On systems with line-power, this entry represents the status of power-line 2. The status of the power is indicated as follows: powerOk: the shelf is receiving a normal (in-range) voltage. powerNotOk: the shelf is not receiving voltage or the voltage is outside of the usable range. A trap is generated with the loss of A power.