The Link Status Meter (LSM) graphically displays the Signal strength and Signal Quality of the link between the client and the associated access point. If used at various locations, this tool can identify areas where performance is weak, and eliminate the risk of losing the connection between your client adapter and an access point.
You can access the LSM by clicking on the LSM icon on the ACU main screen.
For more information, refer
1. Viewing the Link Status Meter for Mac OS for examples of what the screen shows and the explanation of the status.
2. Viewing the Link Status Meter for windows
Analyze (examine, manage, test or view data)
WLAN adapters (wireless card) / ACU (Aironet Client Utility)