There was some discussion (http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/RSSI-lower-level-starting-from-firmware-3-0/m-p/60260#U60260) that the newer 3.x software calculates RSSI differently (more accurately?) than previous versions, which could explain the differing RSSI but same SNR between the 2000 and 1000. What version was the 1000 running?
Rich