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# Summaries of Analyzing and Handling High Temperature of Cards on the NE40E

## Issue Description

NE40E&NE80E version: V600R001C00SPC800
On the live network, the temperature of one or more LPUs on the NE40E is always high. Run the display temperature command. The command output shows that the temperature detected by two temperature sensing nodes on LPUF in slot 1 are high.
disp temperature
SlotID1 :

Base-Board, Unit:C, Slot1
TMin Tmax (C)
-----------------------------------------------------------------
LPUF 7 175 0 NORMAL 65 75 81 55 65 42
LPUF 7 175 1 NORMAL 90 96 102 80 90 53
LPUF 1 1 0 NORMAL 70 80 90 60 70 42
LPUF 1 2 0 NORMAL 60 70 80 50 60 43
LPUF 1 4 0 NORMAL 70 80 90 60 70 44
LPUF 1 5 0 NORMAL 80 90 100 70 80 50
LPUF 1 6 0 NORMAL 70 80 90 60 70 35
LPUF 2 76 1 NORMAL 90 96 102 80 90 62
LPUF 2 76 2 NORMAL 90 96 102 80 90 72
TCMB 1 3 0 NORMAL 70 80 90 60 70 47
TCMB 1 7 0 NORMAL 60 70 80 50 60 44
E8GF 3 73 0 NORMAL 80 86 100 80 100 38
E8GF 3 74 0 NORMAL 80 86 100 80 100 40
P4CF 4 73 0 NORMAL 80 86 100 80 100 38
P4CF 4 74 0 NORMAL 80 86 100 80 100 36

An alarm is generated indicating that the LPU temperature exceeds the maximum value.

dis alarm all
----------------------------------------------------------------------------
Level          Date        Time                Info

Error        11-12-18    14:30:22    SlotID1, address76 temperature over minor
threshold
----------------------------------------------------------------------------

N/A

N/A

## Solution

Analyze and handle the high temperature of the LPU on the NE40E&NE80E as follows:
1. High ambient temperature
The temperature in the equipment room directly affects the LPU temperature. For example, the temperature of LPUs on a device near to the air conditioner is low, and the temperature of LPUs on a device away from the air conditioner is high. When the temperature of an LPU is high but within the allowed range, no action is required.

2. Air filter and fan box
When the air filter and fan box are dusted, the air intake vent does not draw well and the heat dissipation of the NE40E degrades, leading to the rise in LPU temperature. It is recommended that the air filter and fan box be cleaned at least every three months.

3. Filler panel
According to the air ventilation mechanism of the NE40E, insert filler panels in the vacant slots to prevent heat dissipation of LPUs from being affected. If filler panels have been inserted, check whether the filler panels are securely inserted; if vacant slots have no filler panels, insert filler panels in a timely manner.

4. Special LPU hardware design
The temperature of a chip on an LPU includes the ambient temperature, case temperature, and junction temperature of the chip. A Huawei-developed chip has a built-in temperature sensor for monitoring the junction temperature, so the temperature of the LPU where the chip is located is higher that of LPUs in other nodes. The temperature monitoring nodes on LPUF-10, LPUF-21, and LPUF-40 use Huawei-developed chips. Their temperature is high but within the allowed range. Delete the alarms on the NMS.

5. Fan rotational speed
When the ambient temperature is lower than 45℃ and the air filter is clean, if the temperature is still high, manually increase the fan rotational speed to improve heat dissipation and ventilation performance on the LPU.
[NE40E-X3]dis fan ----- The current fan rotational speed is displayed.

[NE40E-X3]_h
[NE40E-X3-hidecmd]fan speed full ------ Set the fan speed to 100%.

## Suggestions

Step 5 in the solution is used for high temperature of a working card. If the card or temperature detection component is faulty, locate faults through exclusion and comparison methods or diagnosis logs, and maintain the hardware.

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