When POS interfaces of two NE80E/40Es are connected, the physical status of POS interfaces cannot go Up (indicating that the interfaces cannot connect).
        The troubleshooting roadmap is as follows:

•  Run the undo shutdown command to check whether configurations of the local device are correct.

•  Check the fiber, optical module, and board on site.

Troubleshooting Procedure

Step 1 Check whether interfaces at both ends of the connection are shut down, the transmit/receive optical power is normal, or if SDH alarms are reported on the interfaces at both ends of the connection.
Step 2 Check whether the optical modules or the fiber is properly connected.

Step 3 Check whether the two ends of the fiber are inserted into correct optical interfaces.

Step 4 Perform the loopback test on the local fiber.

Step 5 Collect the following information and contact Huawei technical support personnel.