What fault occurs when the ALM indicator of a board is on

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When the ALM indicator of a board is on, the most possible cause is that the temperature of the board exceeds the upper limit. The hermetic cabinet is not well ventilated. If the dust concentration in the equipment room is high, especially in the areas with heavy blown sands, the air filter may be blocked, which affects ventilation. As a result, the temperature in the chassis rises considerably. You need to clean the air filter in this case. The air filter is installed at the rear of the S7700&S9700 chassis. You can loosen the screws to remove the air filter.
If the air filter is not blocked but the environment temperature is high, you can run the display temperature slot slot-id command to check the temperature of the board.
In addition, the failure of fans also causes high temperature of boards.

Other related questions:
Reason why the disk fault indicator is not on when the disk is faulty
The storage disk has the physical status and logical status. The physical status can be considered as the physical feature status of the disk. Therefore, you are advised to replace the disk when a physical fault occurs. The logical status is assigned by the software. In some cases, the disk can still be used when a logical fault occurs. When the I/O of the disk fails, the logic is faulty. If a disk is physically faulty, the logic is also faulty. The software turns on the fault indicator. Because the disk cannot be used, the disk fault indicator is on and prompts you to replace the disk. The logic of a disk is faulty, but the physical status may not be faulty. In some cases, the disk can still be used. Therefore, the disk fault indicator is not turned on.

Indication when the SRV indicator on the TOM board is red
The SRV indicator is a service alarm indicator. The indicator status is described as follows: On (green): The service is normal. On (red): A critical or major service alarm is present. On (yellow): A minor or remote service alarm is present. Off: No service is configured.

When an MRS board is added on the U1980, the board status is fault.
1. Delete the board and then add the board again. 2. Remove the board. After reinstalling the board, check the board status. 3. Reload the boot version in boot2 mode.

System processing when a fault occurs during the WTR time on an ASON network?
When a fault occurs during the WTR time, how the system processes a service is related to the service SLA but not related to whether the automatic reversion time is set. For example, if the service is under diamond rerouting 1+1 protection and the protection trail is faulty during the WTR time, the ASON software considers that both the working and protection trails are faulty and therefore computes a new route according to the rerouting 1+1 protection mechanism. If the service is under diamond non-rerouting 1+1 protection, when the preceding condition occurs, the service is directly interrupted according to the non-rerouting 1+1 protection mechanism.

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