Hi MIkrotiks , I have replaced to my CRS 317-1G-165+ the two internal A.C to D.C power supplies with 2 X DC-DC converters ( 48 input to 24 v D.C output 70 watts each ) to be powered-up from a telecom supply 48 v D.C. The negative of the two power input of CRS Circuit Board is common , checked with t...