The instrument connected to the LOM receives a lot of CRC error packets when an engineer disables distance extension.
This fault lies in the improper test environment and does not need to be rectified.
Logic PL253 on the LOM requires a switch to adjust the number of idle packets. Without the switch, the LOM cannot adjust the number of idle packets. As a result, CRC errors occur. Huawei recommends against connecting an instrument directly to the LOM to test extension.