Instrument Control (GPIB, Serial, VISA, IVI)

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Samples collected in pc from USRP receiver port

Hi, I am collecting IQ samples at the receiver port of USRP-2900. Now, do these sample values represent the voltage levels or is there any any conversion to be done? I am asking this because when I am perform an averaging over magnitude squares of these samples, and taking log of this gives be power in dBfs. I need power in dbm. So, if the IQ values are in volts then (I^2 + Q^2)/(2*R)  can give me power in dBfs. So please let me know if they are in volts and also is R=50ohms in USRP 2901?

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