Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 - Manual (Page 96)

95
80 1 in 10,000 raw bit errors
60 1 in 1000 raw bit errors
40 1 in 100
20 1 in 10.
Flags
Addition indications for this entry. G=Gateway, F=Fixed, E=External
Gateway: This unit is a gateway to provide access outside of the radio
network.
Fixed: Manually configured route.
External: Accesses a device outside the local network.
Iface The connection interface (er0 = Ethernet radio, eth0 = Ethernet LAN)
Age (H:M:S) This is the timeout of the message in Hours, Minutes, Seconds
LQI (Link Quality Indication)

Because a typical frame is around 80 bytes (4480bits), you should not normally
see any readings between 75 and 99.

Communication becomes unreliable with LQI around 30.

As the LQI drops below 25, nearly every frame will have enough bit errors that
the FEC will no longer be able to recover the original data, so the frame will be
corrupted. Hence you will hardly ever see a reading below 25.

With signal strength (RSSI) -100 dBm or better, the LQI should always read 100.
You should expect LQI readings below 100 with signal strength -105 dBm or
worse.

If you have good signal strength and are getting LQI readings less than 100, this
is a sign of interference, or of a problem with the radio of the unit you are using.