tmnxChassisPowerSupplyAssignedType configures the type of power supply
for a platform. Based on the value assigned to this object, various
power supply monitoring signals will be interpreted. For example, if
a platform is provisioned to use DC power supplies, then the signal
that indicates an AC power supply is missing can be ignored.
The configuration of this object away from 'default (4)' is required
for proper generation of traps and LED management.