Whether the FIU board reports the MUT_LOS alarm

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Yes, it does.

Other related questions:
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.

Differences of the MUT_LOS and R_LOS alarms on OA boards of WDM devices
Question: On Huawei WDM devices, why some OA boards report the R_LOS alarm whereas some OA boards report the MUT_LOS alarm when they do not receive any light or the receive optical power is excessively low? Analysis: None Answer: When the OA boards (such as WPA, WBA, and WLA) on 320G devices do not receive any optical signals, the R_LOS alarm is reported. When the OA boards (such as OPU, OBU, and OAU) on 1600G, 800G, and 400G devices do not receive any optical signals, the MUT_LOS alarm is reported. Suggestion and conclusion: The R_LOS alarm is used to indicate the loss of input optical signals on a single wavelength of a board such as OTU. The MUT_LOS alarm is used to indicate the loss of multiplexed optical signals on a board such as M40, D40, OAU, OBU, or OPU. It is inaccurate that the R_LOS alarm is reported when OA boards do not receive any optical signals. Therefore, the R_LOS alarm is canceled for new OA boards. When developing new 1600G, 800G, and 400G WDM systems, Huawei adjusts the alarm that is reported when OA boards do not receive any optical signals. To be specific, the OA boards report the MUT_LOS alarm when receiving no optical signals.

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.

FIU board isolation
Isolation refers to the ratio of the optical power leaked by local-frequency or RF signals to the input optical power, in the unit of dB. Isolation of a frequency mixer refers to the mutual isolation between frequency ports, including the isolation among local frequency, IF, and RF.

Whether an FIU board on an OSN 1800 supports optical power detection
A TNF2FIU board on OSN 1800 V100R005C00SPC200 supports optical power detection.

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