Hi Toml,
About your question is Mirror function does not work when you apply device power saving function,right?
Or does not need to config other function settings and just enable Mirror function, and then the DGS-1224T will no reply after a while?
As I know the "Power Saving" Function need to change device hardware interface settings that will cause the device interface re-negotation again after change power saving settings. Of course, the device all interfaces will be disconnect a while when you change power saving settings.
Thanks a lot.
Poyi