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.

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