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An entSensorValueTable entry describes the
present reading of a sensor, the measurement units
and scale, and sensor operational status.

An entSensorThresholdTable entry describes the
thresholds for a sensor: the threshold severity,
the threshold value, the relation, and the
evaluation of the threshold.
Only entities of type sensor(8) are listed in this table.
Only pre-configured thresholds are listed in this table.
Users can create sensor-value monitoring instruments
in different ways, such as RMON alarms, Expression-MIB, etc.
Entries are created by the agent at system startup and
FRU insertion.  Entries are deleted by the agent at
FRU removal.

This variable indicates the type of data
reported by the entSensorValue.
This variable is set by the agent at start-up
and the value does not change during operation.

This variable indicates the exponent to apply
to sensor values reported by entSensorValue.
This variable is set by the agent at start-up
and the value does not change during operation.

This variable indicates the number of decimal
places of precision in fixed-point
sensor values reported by entSensorValue.
This variable is set to 0 when entSensorType
is not a fixed-point type:  voltsAC(1), voltsDC(2),
amperes(3), watts(4), hertz(5), celsius(6), or cmm(9).
This variable is set by the agent at start-up
and the value does not change during operation.

This variable reports the most recent measurement seen
by the sensor.
To correctly display or interpret this variable's value,
you must also know entSensorType, entSensorScale, and
entSensorPrecision.
However, you can compare entSensorValue with the threshold
values given in entSensorThresholdTable without any semantic
knowledge.

This variable indicates the present operational status
of the sensor.

This variable indicates the age of the value reported by
entSensorValue

This variable indicates the rate that the agent
updates entSensorValue.

An index that uniquely identifies an entry
in the entSensorThreshold table. This index
permits the same sensor to have several
different thresholds.

This variable indicates the severity of this threshold.

This variable indicates the relation between sensor value
(entSensorValue) and threshold value (entSensorThresholdValue),
required to trigger the alarm.  when evaluating the relation,
entSensorValue is on the left of entSensorThresholdRelation,
entSensorThresholdValue is on the right.
in pseudo-code, the evaluation-alarm mechanism is:
...
if (entSensorStatus == ok) then
if (evaluate(entSensorValue, entSensorThresholdRelation,
entSensorThresholdValue))
then
if (entSensorThresholdNotificationEnable == true))
then
raise_alarm(entSensorThresholdAlarmOID);
endif
endif
endif
...

This variable indicates the value of the threshold.
To correctly display or interpret this variable's value,
you must also know entSensorType, entSensorScale, and
entSensorPrecision.
However, you can directly compare entSensorValue
with the threshold values given in entSensorThresholdTable
without any semantic knowledge.

This variable indicates the result of the most
recent evaluation of the threshold.  If the threshold
condition is true, entSensorThresholdEvaluation
is true(1).  If the threshold condition is false,
entSensorThresholdEvaluation is false(2).
Thresholds are evaluated at the rate indicated by
entSensorValueUpdateRate.

This variable controls generation of
entSensorThresholdNotification for this threshold.
When this variable is true(1), generation of
entSensorThresholdNotification is enabled.  When this
variable is false(2), generation of
entSensorThresholdNotification is disabled.
This variable only controls generation of
entSensorThresholdNotification.

This table lists the type, scale, and present value
of a sensor listed in the Entity-MIB entPhysicalTable.

This table lists the threshold severity, relation, and
comparison value, for a sensor listed in the Entity-MIB
entPhysicalTable.

The sensor value crossed the threshold
listed in entSensorThresholdTable.
This notification is generated once each time
the sensor value crosses the threshold.
The agent implementation guarantees prompt, timely
evaluation of threshold and generation of this
notification.

The CISCO-ENTITY-SENSOR-MIB is used to monitor
the values of sensors in the Entity-MIB (RFC 2037)
entPhysicalTable.

The collection of objects which are used
to describe and monitor values of Entity-MIB
entPhysicalTable entries of sensors.

The collection of objects which are used
to describe and monitor thresholds for
sensors.

the collection of notifications used for
monitoring sensor threshold activity.