I have a PWS-920P-1R power supply on order. I understand it has a +12V and +5V standby output.
I also ordered a PDB-PT808-S20 Power Distribution Board which arrived. On this board there is only +12V and +5V standby output. Where does the +5V, +3.3V, -12V come from? Did I get the wrong distribution board?
Yes, You did order wrong distribution board, PDB-PT808-S20 power distribution board only have +12V and +5V standby output. You may consider the power distributor with part number PDB-PT745-8824 for power supply PWS-920P-1R.