AP Differential

Displays the current beacon strength of each access point compared with an earlier snapshot. The current beacon strength is displayed in green, the snapshot in light-blue, and the difference in gray. The Y-axis reports the signal strength as a signal quality (0 – 100%) — where a maximum signal is assumed to be -20 dBm and the dissociation signal is -85 dBm (http://www.ces.clemson.edu/linux/dbm-rssi.shtml). We find this more intuitive than reporting a RSSI in dBm or mWatt. If you would also like to know the signal strength in dBm then this is reported in the grid above the chart.

This display can be used to view small (or large) changes in beacon strength over time. Here’s how it works — when the scanning first begins then a ‘snapsot’ of the beacon strengths are taken — these are the light-blue bars. These bars are static and do not change. The green bars show the current beacon strengths, and the gray bars are the difference between the snapshots and the current beacons.