RFX 2400 max transmit and receive power

Hi

I want to connect two separate USRPs with RFX 2400s on them directly via
coax cable so that I get a clean channel for debugging instead of a
wireless
channel. I am trying to figure out what are the maximum allowable output
and
input powers for the RFX 2400 so that I can use the appropriae
attenutation.
Has anyone done this before and if so what is the setup they used?

Thanks
Sachin

Use at least 40 dB attenuation to be safe and avoid damage. Signal
levels will be better if you use about 60 dB.

Matt