Meanings of the INTRA_OTU_STA_INDI alarm

INTRA_OTU_STA_INDI is an alarm indicating the OTU intra-board 1+1 protection status. It specifies whether the current active channel is faulty and whether protection switching is triggered. The alarm parameters indicate the specific protection switching cause.
An INTRA_OTU_PS alarm is generated to switch services from the working channel to the protection channel only when protection switching is triggered by a forcible or manual switching command, or by a fault.
1. Will the alarm be generated when the working channel is faulty and protection switching occurs?—Yes. Both INTRA_OTU_STA_INDI and INTRA_OTU_PS alarms will be generated.
2. Will the alarm be generated when the protection channel is faulty and protection switching does not occur?—Yes, the INTRA_OTU_STA_INDI alarm will be reported.
3. Will the alarm be generated when both the working and protection channels are faulty?—Yes. In this scenario, protection switching does not occur.
4. Will the alarm be generated in forcible protection switching mode?—Yes. The alarm is generated when a forcible switching command is issued and an INTRA_OTU_PS alarm is generated when the forcible protection switching is successful.

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