Tried two different 951's and two different SXT's, connected by a 1 meter patch cord for testing. The red LED just flashes, no matter if set to "auto" or "forced".
The SXT's work powered from RB750UP. LocoM5 works powered from the 951. Are the 951's defective, or simply have not enough power to even power up (no radio activity, not even ethernet link for a while) the SXT-ac?