Specifications

B
IPMI Commands and Managed Sensors
104
Managed sensors
On the CPM, the IPMC sensors monitor voltages, temperatures, control signals, and status events.
For functional information, refer to IPMC description on page 50. The sensors are described in
Table 35 on page 105.
Types of sensors
The CPM implements the following types of sensors.
• Discrete — A discrete sensor can have up to 16 bitmapped states, with one state as true.
• Digital — A digital sensor has two possible states, only one of which can be active at any given
time. For example, a digital sensor monitoring the power may indicate whether the power is good
or not good.
• OEM — An OEM sensor has its states defined by the manufacturer. The reading types of these
sensors are sometimes defined as “sensor-specific.”
• Threshold — A threshold sensor has a range of 256 values, which represent measurements on
the PPM and its FRUs. Temperature, voltage, current, and fan speed sensors are examples of
threshold sensors. Table 34 lists the possible threshold types, which are used in Table 35 on
page 105.
Note: If the CPM exceeds one of the UNR thresholds (Table 35 on page 105), the Shelf Manager
generates a critical alarm and shuts down the CPM. See the Software Guide for details.
Table 34. Threshold types
Threshold type Description
UNR Upper non-recoverable thresholds generate a critical alarm on the high side.
UC Upper critical thresholds generate a major alarm on the high side.
UNC Upper non-critical thresholds generate a minor alarm on the high side.
LNC Lower non-critical thresholds generate a minor alarm on the low side.
LC Lower critical thresholds generate a major alarm on the low side.
LNR Lower non-recoverable thresholds typically generate a critical alarm on the low side.