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MPCMM0001 Chassis Management Module Software Technical Product Specification 101
Sensor Types
Sensor Types 10
10.1 CMM Sensor Types
The CMM provides access to and can log events from different IPMI sensor types. These sensors
can be both threshold-based sensors or discrete sensors, depending on the type of reading and
events they generate. For more information on sensors and sensor types, refer to the “Intelligent
Platform Management Interface Specification v1.5”, available on http://www.intel.com.
10.2 Threshold-Based Sensors
Threshold-based sensors are sensors that generate or change an event status based on comparing a
current value to a threshold value for a given hardware monitor device. Examples of threshold-
based sensors are temperature, voltage, and fan tachometer sensors.
10.2.1 Threshold-Based Sensor Events
Threshold-based sensors generate events when a current value for a device becomes greater than or
less than a given threshold value. The IPMI specification defines six thresholds that can be
assigned to a given sensor. The sensor will generate an event when its current reading goes above
or below any of these thresholds. The severity of the event generated depends on which threshold is
crossed. These six thresholds and their associated event severity are as follows: