Whether the laser restarts when all detection conditions are met or any detection condition is met in IPA configuration

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The laser restarts when any detection condition meets the IPA restoration requirements.

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

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.

Relationship between Laser Control and Laser Restart Mode of the IPA feature
The Laser Control parameter is applicable to the IPA function in a Raman system and high-power EDFA optical amplifier boards. It needs to be set for each IPA pair. The Laser Restart Mode parameter is set as required. When Laser Restart Mode is set to Manual and Laser Control is set to Enabled, the output optical power of the laser control board in an IPA pair is limited to a value lower than 10 dB during an IPA restart. When Laser Restart Mode is set to Manual and Laser Control is set to Disabled, the laser control board has the same optical power as it would have when no IPA is configured. When Laser Restart Mode is set to Automatic, Laser Control must be set to Enabled. In this manner, the laser control board will enable the laser to test whether the link is restored during each test period. When the Laser Restart Mode parameter is set to Disabled, the laser control board has the same optical power as it would have when no IPA is configured. As a result, the laser from the exposed fiber may cause personal injuries (especially to eyes).

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