Reason why the RO port of the TN12OLP board does not output optical signals when the RI1 port has input optical signals, but outputs optical signals when the RI2 port has input optical signals

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When no port configuration is configured on the TN12LOP board, the board receives optical signals through its RI2 port by default.

Other related questions:
Optical signal indicators detected by the MCA board
Question: What are the optical signal indicators that can be detected by the MCA board? Analysis: None Root cause: None Answer: Optical power, center wavelength, OSNR, and number of channels.

Whether the client-side optical port of the peer OTU board does not send or receive optical signals if the client-side optical port of the local OTU board does not with ALS enabled
According to the ALS principle, if the local OTU board does not receive any optical signal on its client side, the peer OTU board will not emit light on its client side.

Whether optical signals of the SC2 board are originated from multiplexed signals or received by the SC2 board
The OSC signals received by the SC2 board are sent from the laser of the peer SC2 board and then are split by the FIU board. They are not multiplexed signals.

The state of an optical interface is not Up when it interconnects with the peer device
For the problem that the state of an optical interface is not Up when it interconnects with the peer device, see the troubleshooting guide. For details, access the URL in the right column.

Reason why an OTU board still reports the R_LOS alarm when receiving optical signals normally
The possible cause is that alarm inversion is manually enabled. During network deployment, some alarms may be reported but are meaningless. For example, a LOS alarm is reported even though no cable is connected to a board on which a service has been provisioned. After alarm inversion is enabled, such an alarm can be not reported to prevent disturbance on maintenance engineers. Alarm inversion needs to be disabled after commissioning is complete.

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