A table entry describing status of a temperature sensor. Sensors are
located throughout the system. The ENTITY_MIB.entPhysicalTable provides
detailed information about the location of each sensor. The index for a
table entry is fixed based on a product-specific algorithm that uses the
maximum number of sensors that may be on any module type associated with
each of the available slots. This means that entries for sensors
associated with empty slots and the 'extra' sensors on modules that have
less than the maximum number of sensors for the slot type will have a
notPresent status.