Impact of the LSR_WILL_DIE alarm reporting on the board laser


Currently, there is no statistics data. The LSR_WILL_DIE alarm indicates that the laser starts aging and its output power begins to degrade gradually. However, the laser aging speed is affected by many factors. To prevent board failures, you are advised to replace the optical module on the related optical port or directly replace the board as soon as possible after a LSR_WILL_DIE alarm is reported.

Other related questions:
Cause for transient alarm reporting on TOM boards
On the OSP platform, alarm reporting has anti-jitter mechanisms. The anti-jitter time for alarm reporting is 2.5s and that for alarm clearing is 10s. If a board alarm task can be reported to the platform at least two consecutive times within 2.5s, alarms may not be transiently reported. If the alarm task reporting interval of a board is greater than 2.5s, transient alarm reporting probably occurs. The alarm task reporting interval of most boards is 1s and alarm status can be reported twice in 2.5s. If an alarm is found during the first detection but cleared during the second detection, the alarm will not be reported. In this manner, transient alarm reporting can be effectively avoided. To reduce the CPU usage, the alarm task reporting interval of TN11TOM boards is 2s but that of TN52TOM boards. As a result, the alarm status may be reported only once in the 2.5s anti-jitter period. Consequently, the alarm anti-jitter mechanism does not take effect and an alarm is reported and lasts 1s. If a higher-priority task preempts the alarm task, the alarm task reporting interval may be longer and the alarm may last for more than 1s. Therefore, TOM boards are prone to report alarms in case of transient service interruption. When bit errors are present on a line, a TOM board may falsely detect that the BDI byte is reset to 1 and therefore transiently reports alarms such as ODU1_PM_BDI. As a result, alarms such as ODU1_PM_DEG may be transiently reported upon SNCP protection switching.

Reason for the failure to report alarms by boards in a subrack when a large number of SHELF_AREA_POWER_OVER alarms are reported
The SHELF_AREA_POWER_OVER alarm indicates that the nominal power consumption of a subrack section exceeds the specified threshold. This alarm is reported when the total nominal power consumption of boards in a subrack section of an NE is greater than or equal to the power consumption threshold of the subrack section. This alarm is reported on the system control boards, such as SCC and 16XCH/16UXCM. If the alarm is present, the subrack is overloaded. When this occurs, you need to remove boards from the corresponding subrack section as required. If the subrack is running in overloaded state for a long time, the power supply to the subrack may be abnormal or interrupted.

Conditions for SFIU boards to report MUT_LOS alarms
Question: When no service is deployed on new TN11SFIU boards at a site, some of the new SFIU boards report the MUT_LOS alarm whereas the others do not. Analysis: The SFIU boards do not detect optical power and do not report the MUT_LOS alarm alone. OA boards are required to produce the MUT_LOS alarms, and the conditions to produce the MUT_LOS alarms are as follows. Answer: The conditions are: 1. There are logical fiber connections. 2. The OA board in the receive direction reports an MUT_LOS alarm. 3. The OA board in the transmit direction does not report any MUT_LOS alarms. 4. The OSC_LOS alarms are ignored.

Whether the FIU board reports the MUT_LOS alarm
Yes, it does.

The time elapsed after the LSR_WILL_DIE alarm is reported and before the laser of the board is damaged
Currently, no statistics are available. The LSR _ WILL _ DIE alarm indicates that the components of the laser are aging, and the output optical power starts to deteriorate. However, the aging speed of the laser varies depending on actual conditions. Therefore, it is recommended that you replace the optical module in the optical port or replace the board after the board reports the LSR_WILL_DIE alarm.

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