MIB: PowerNet-MIB
The reason for the occurrence of the last transfer to UPS
battery power.  The variable is set to:
- noTransfer(1) -- if there is no transfer yet.
- highLineVoltage(2) -- if the transfer to battery is caused
by an over voltage greater than the high transfer voltage.
- brownout(3) -- if the duration of the outage is greater than
five seconds and the line voltage is between 40% of the
rated output voltage and the low transfer voltage.
- blackout(4) -- if the duration of the outage is greater than five
seconds and the line voltage is between 40% of the rated
output voltage and ground.
- smallMomentarySag(5) -- if the duration of the outage is less
than five seconds and the line voltage is between 40% of the
rated output voltage and the low transfer voltage.
- deepMomentarySag(6) -- if the duration of the outage is less
than five seconds and the line voltage is between 40% of the
rated output voltage and ground.  The variable is set to
- smallMomentarySpike(7) -- if the line failure is caused by a
rate of change of input voltage less than ten volts per cycle.
- largeMomentarySpike(8) -- if the line failure is caused by
a rate of change of input voltage greater than ten volts per cycle.
- selfTest(9) -- if the UPS was commanded to do a self test.
- rateOfVoltageChange(10) -- if the failure is due to the rate of change of
the line voltage.