Pretty much all the telecom GPSDO's are driven by an on-board, isolated DC-DC
converter. Some are 24V nominal input, some are 48V (a few are even 18-72V).
The '+' / '-' designation is pretty much irrelevant since the converter inputs
are isolated and are not referenced to chassis ground... and there is a series
blocking diode to make them semi-idiot-proof. You do need to get the proper
polarity of the power supply to the inputs to the converter. All mine have a
center positive barrel jack wired directly to the input diode on the board.
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