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[ScreenOS] What is the significance of the two temperature values shown for system board in ISG platforms?

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Article ID: KB28202 KB Last Updated: 31 Oct 2013Version: 1.0
Summary:
On ISG platforms, there are two temperature values shown for the system board in the output of the command get chassis. This article explains the significance of these two temperature values.

Symptoms:

Here is an example using the output of the command get chassis on an ISG platform:

<snippet >
nsisg2000(M)-> get chassis
Chassis Environment:
Power Supply: One power supply is down
Fan Status: Good
CPU Temperature: 116'F ( 47'C)
Slot Information:
Slot Type S/N Assembly-No Version Temperature
0 System Board 0079082004000082 0051-005 E01 87'F (31'C), 93'F (34'C) <---- There are two temperature readings for System Board 
4 Management 0081082004000017 0049-004 D04 116'F (47'C)
Cause:
 
Solution:

The system board is a component on which the management board/ASIC board/security modules, etc., are installed.

ISG platforms provide two temperature readings for the system board. Actually, there are two temperature sensors on an ISG system board. One sensor is located on the rear of the board, and another one is located about two inches behind the CF card on the front panel. These two sensors measure the ambient temperature of air flow at two different locations inside the ISG chassis. As a result, two temperature values are seen in the system board in the output of the get chassis command.

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