# RSSI

RSSI (Received Signal Strength Indicator) is an indicator of the radio signal strength that directly defines the radio communication quality. There are two RSSI values - Controller RSSI and Device RSSI, which shows the received signal strength seen from both the node (Device) and the gateway (Controller).

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Normally these numbers are quite close to each other but may differ if one party has better reception than the other. The following table can be used as a guideline to determine if the signal strength is good enough:&#x20;

| RSSI value    | Transmission quality |
| ------------- | -------------------- |
| above -45dBm  | Excellent            |
| -46 to -55dBm | Good                 |
| -56 to -65dBm | Ok                   |
| -66 to -75dBm | Fair                 |
| below -76dBm  | Bad                  |

&#x20;It is recommended to avoid installation if any of two RSSI is below -75dBm. Such bad conditions may lead to intermittent communication problems and communication alarms in Boomerang. The Device RSSI is also shown as a technical measurement point in Boomerang.