The networking is as follows:
Station A and station B are configured with the LWX2 and the DMD2S. Each SCC is configured with one 1551-nm optical module to implement the OSC communication. The configuration of the two stations is the same. The NE version is 5.67.1.22. After Huawei optical power commissioning is complete, the ECC between station A and station B fails. 1. The optical power is incorrect.
2. The optical module is faulty.Huawei OSN 1800
3. The SCC software is defective The SCC software has a bug. When the PHY chip used by the OSC optical port on the SCC works in BASE-EFX mode, special requirements are raised for the optical module. That is, the chip can be linked only when the amplitude of the electrical input signals of the optical module is higher than 800 mV. The amplitude of the electrical input signals of the currently used optical module is about 800 mV. Therefore, the OSC communication may fail.

The LWX2 does not support the ESC. Station A and station B use the optical module on the SCC to implement the OSC communication. Check the receive optical power of the RM1/TM1 optical port on the SCC. The check result shows that the receive optical power is normal. There is no abnormal alarm. Run :cm-get-eccroute. The remote NE cannot be queried. Run :cm-get-bdinfo to query the DCC state. The query result shows that the DCC state is rx-f. Reset the SCC. The fault persists.
Install OptiX OSN 1800 A and OptiX OSN 1800 B in the same equipment room. Interconnect the RM1s/TM1s of the two OptiX OSN 1800s with the added fixed optical attenuators through fibers. Run :cm-get-eccroute. The remote NE still cannot be queried. The DCC state is still rx-f.
The confirmation result by the related experts shows that the SCC software has a bug. When the PHY chip used by the OSC optical port on the SCC works in BASE-EFX mode, special requirements are raised for the optical module. That is, the chip can be linked only when the amplitude of the electrical input signals of the optical module is higher than 800 mV. The amplitude of the electrical input signals of the currently used optical module is about 800 mV. Therefore, the OSC communication may fail.
Software mitigation is performed in the latest version (5.67.01.24). The problem is solved. After the NE software is upgraded to this version, the OSC communication is normal on Huawei WDM OSN 1800( http://www.thunder-link.com/HUAWEI-OPTIX-OSN1800_p191.html ).