Signal Quality - Campbell CR300 Series Product Manual

Signal strength units are –dBm; –70 is a stronger signal than –100.
Table 12-1: Signal strength
Strength estimate
Excellent -70 or greater -90 or greater
Good
Fair
Poor less than -100 less than -115

12.4.2 Signal quality

Signal quality shows how much interference there is between the cellular tower and CR300-CELL,
or how noisy a band is. Cellular signal noise comes from reflections, ghosting and other
interference. Better signal quality is an indicator of more successful communications during
precipitation events such as rain and snow.
For 3G networks, signal quality is ECIO (Energy to Interference Ratio). For 4G, this is RSRQ
(Reference Signal Received Quality).
Signal quality units are –dBm; 0 is a better signal than –10.
Table 12-2: Signal quality
ECIO (3G)
Quality estimate
Excellent 0 to -6
Good -7 to -10
Fair to poor -11 to -20 -13 or less
RSSI (3G) RSRP (4G)
dBm dBm
-71 to -85 -91 to -105
-86 to -100 -106 to -115
RSRQ (4G)
dBm dBm
>-9
-9 to-12
12. Cellular communications option 51