I & Q samples

Im not very sure but does the usrp source/sink take data , in the
complex
format xi+yj or is it x y as serial data where x is the real part and
y is
the imaginary.
I had one computer running the vector source , and using an ethernet
cable
connecting another computer , i wrote a code to take data from the udp
and
sink it to the usrp , i did the opposite on 2 other computers and then
viewed the data on octave they seemed totally different, the vector
source
is already know as its a counter , the received data is 0, 1 ,-1
absolute
values !!
can someone tell me whats going on ?

thanks for your time
ziad

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