SMC Networks ElliteConnect 2.4GHz/5GHz - Manual (Page 130)

System Configuration
6-54
RSSI
The RSSI value displayed on the RSSI page represents a signal
to noise ratio. A value of 30 would indicate that the power of the
received signal is 30 dBm above the signal noise threshold. This
value can be used to align antennas (see page 4-9) and monitor
the quality of the received signal for bridge links. An RSSI value
of about 30 or more indicates a strong enough signal to support
the maximum data rate of 54 Mbps. Below a value of 30, the
supported data rate would drop to lower rates. A value of 15 or
less indicates that the signal is weak and the antennas may
require realignment.
The RSSI controls allow the external connector to be disabled
and the receive signal for each WDS port displayed.