This post will tell you a case about the SL64 board reports the R_LOF alarm due to the service attribute issue.
Problem Description
The customer has an OSN7500 on a site, which is connected to an OSN6800 TDX board through the SL64 board and transmits the signal to the peer device. Now the R_LOF alarm is reported on the SL64 board, OSN7500 cannot communicate with the peer device. Customer requests to cooperate.
Handling procedure:
1. The SL64 board reports the R_LOF alarm but does not report the R_LOF alarm. This indicates that the SL64 board can receive the optical signals from the TDX board.
2. Check the alarms on the opposite equipment. It is found that the same alarm is generated. This indicates that the fault may occur on the WDM link.
3. Checked the WDM trail based on the signal flow. No fault was found.
4. Checked the port settings of the TDX board and found that the service type was not configured, as shown in the following figure：
When the service type is set to STM-64, the R_LOF alarm is cleared.
Root cause:
The service type of the TX/RX port on the TDX board is not set to STM-64 service board.
Solution:
The service type of the TX/RX port on the TDX board must be set to STM-64.
