Q: KD7003 is connected to an external TDM, and the submodule shows Offline, but the submodule is normal on KD8003B. What's the matter? 

A: Check whether the firmware version of the submodule is 1.0.1 build230601 and later. The firmware of the TDM module used when KD7003 was released is 1.0.1 build230601.