SEL Troubleshooting Guide

System Event Log Troubleshooting Guide for Intel
®
S5500/S3420 Series Server Boards Cooling Subsystem
Revision 1.1 Intel order number G74211-002 33
5.2 Temperature Sensors
There are a variety of temperature sensors that can be implemented on Intel
®
Server Systems. They are split into three types: regular
temperature sensors, thermal margin sensors, and discrete temperature sensors. Each of them has its own types of events that can be logged.
5.2.1 Regular Temperature Sensors
Regular temperature sensors are sensors that report an actual temperature. These are linear, threshold-based sensors. In most Intel
®
Server
Systems, there are at least two sensors defined: front panel temperature and baseboard temperature. Both these sensors typically have upper
and lower thresholds set – upper to warn in case of an over-temperature situation, lower to warn against sensor failure (temperature sensors
typically read out 0 if they stop working).
Table 33: Temperature Sensors Typical Characteristics
Byte
Field
Description
11
Sensor Type
01h = Temperature
12
Sensor Number
See Table 35
13
Event Direction and
Event Type
[7] Event direction
0b = Assertion Event
1b = Deassertion Event
[6:0] Event Type = 01h (Threshold)
14
Event Data 1
[7:6] – 01b = Trigger reading in Event Data 2
[5:4] – 01b = Trigger threshold in Event Data 3
[3:0] – Event Trigger Offset as described in Table 34
15
Event Data 2
Reading that triggered event
16
Event Data 3
Threshold value that triggered event