Reason why the laser on the RAU board cannot be turned on

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The possible causes are as follows:
1. The fiber return loss exceeds the threshold.
2. The IPA is not configured.
3. When the network becomes faulty, IPA is triggered and the laser is shut down.

Other related questions:
Whether the laser on an FIU board can be turned off
An FIU board is not equipped with any laser. Instead, it has only optical splitters, multiplexers, and demultiplexers. Therefore, no laser can be turned off.

Method used to keep the laser on an OTU board off since it is automatically turned on 5 minutes after it is turned off
You can set Laser shutdown to Disable in Automatic Disabling of NE Function on the U2000.

DAS1 boards cannot be configured at an OLA site
1. A built-in FIU is configured on the DAS1 board and an extra FIU board must also be configured for the OLA site. The configuration is asymmetric. 2. The DAS1 board has only one variant (OAU101), and therefore cannot meet the flexible configuration requirements of OLA sites.

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.

Reason why TN13FIU does not turn red on the NMS in case of a fiber cut
TN13FIU is a passive board and therefore cannot detect MUT_LOS signals. In case of a fiber cut, it does not turn red on the NMS.

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