We had an operation to change the operating frequency of LOG board from even channel to odd channel but the operation was failed, and a "Threshold crossing of wavelength number, error code:39209" failed operation message was appeared as attached.
I tried to configure another even channel and it was configured successfully.
I found that there was an internal fiber connection in U2000 connected to this OTU board, I had deleted it and the new odd channel was configured successfully.
1- the board is tunable and support all C band 80 frequencies (even and odd channels)
2- the board version is matched with NE sofware version
3- there was an internal fiber connection in U2000 connected to this OTU board which may cause the failed frequency change operation.
You have to delete all internal fiber connected to the OTU board in U2000 when you want to re-configure frequency channel of tunable OTU board.