R_los

Hello,

Client-side cause 1: On the optical connector of the local board, the pigtail is not connected, or is loosely or incorrectly connected.
Client-side cause 2: The line attenuation is too large, or a fiber cut occurs on the line.
Client-side cause 3: The board that reports the alarm is faulty.
Client-side cause 4: If the board reporting the alarm is a 40G or 100G board, at least one wavelength has been missing from the receive end of the board.
WDM-side cause 1: On the optical connector of the local board, the pigtail is not connected, or is loosely or incorrectly connected.
WDM-side cause 2: The line attenuation is too large, or a fiber cut occurs on the line.
WDM-side cause 3: The board laser at the peer site is turned off.
WDM-side cause 4: A fault occurs on the transmit module of the board at the peer site or on the receive module of the board at the local site.

Hope this helps
Thanks