RSSI stands for Received Signal Strength Indicator. It is a measure of power level that a RF client device is receiving from an access point or router.
At larger distances, the signal gets weaker and the wireless data rates get slower, leading to a lower overall data throughput. Signal is measured by the receive signal strength indicator (RSSI), which indicates how well a particular radio can hear the remote connected client radios. For point-to-(multi)point applications, the optimal RSSI on each end of the wireless link is between -40 dBm and -50 dBm to achieve the highest possible data rates.
The best practice is to pre-configure the radios with a transmit power of 17 dBm and validate that a link
is properly established (which serves to validate security and MAC address settings as well). Once the
access points are physically mounted in place, look at the RSSI readings on each radio and adjust the
transmit power settings on each side of the link up or down to get the RSSI to within the -40 dBm to -50
If the signal strength is greater than -35 dBm (typical for wireless links under 50 feet), then the electronic
amplifiers get saturated because the signal is too strong, which degrades throughput performance. In
such scenarios, turning down the power to minimum (11 dBm) may be insufficient, and if so we
recommend purposely misaligning the antennas.
If the signal strength is less than -75 dBm (typical for very long distance shots over 4 miles), it may be
difficult to sustain a link reliably or to achieve high throughputs, especially in the presence of external
interference. For long distance shots, EnGenius recommends using laser tooling to optimize the antenna
alignment so as to maximize the signal.