Trigger conditions for the IPA function of the Raman system


Some alarms on the detection boards and auxiliary detection boards are the trigger conditions for the IPA function of the Raman system. The alarms for triggering the IPA function vary depending on boards. For example, when the detection board is OAU1, a MUT_LOS alarm triggers the IPA function.
For Raman boards supporting the optical power detection function, they determine whether to trigger the IPA function after checking the optical power.
For details about the trigger conditions for the IPA function, see the product documentation.

Other related questions:
Trigger conditions of the CHAN_LOS alarm on OTN equipment
The possible causes are as follows: 1. A monitored wavelength is not received actually. 2. The laser on the related board at the peer-end site is off. 3. Optical power variations of the monitored wavelengths are too large. 4. The multiplexing or amplifier unit connected to the MCA board has an overly large attenuation value. 5. The OTU board in the upstream direction of the MCA board is faulty. 6. The MCA board that reports the alarm is faulty.

Whether the laser restarts when all detection conditions are met or any detection condition is met in IPA configuration
The laser restarts when any detection condition meets the IPA restoration requirements.

Precautions for setting rerouting trigger conditions on an ASON network
Rerouting trigger conditions are determined based on the number of available network resources and service importance. If there are sufficient resources or protected services are important, you can select the policy of triggering rerouting when any LSP fails. In this way, 1+1 protection is retained for services under SNCP protection or optical-layer associated services, and quick switching can be achieved upon a fault. Even if a rerouting failure occurs, the failure can be detected in a timely manner. If there are insufficient resources or the protected services are less important, you can select the policy of rerouting when both LSPs fail. In this way, the 1+1 protection provided for the services can survive only one fault. When both LSPs fail and service rerouting is triggered, the service will be interrupted for a short time (depending on the rerouting time), or be interrupted for a long time if rerouting fails.

Criteria for restarting a laser in IPA
When any detection condition meets the IPA recovery criteria, the laser is restarted.

Trigger conditions of ODUk SNCP switching
The conditions for triggering automatic ODUk SNCP switching are as follows: The board cannot be detected (for example, the board is removed or undergoes a cold reset). There are board alarms indicating SF and SD.

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