RSSI and SNR
In wireless communication, RSSI and SNR determine signal quality.
RSSI (Signal Strength)
- Measures how strong the signal is (like how loud someone is speaking).
- Good: Above -115 dBm
- Poor: Below -126 dBm
- Analogy: In a concert, voices can be loud (RSSI = -80 dBm) but still hard to hear due to noise.
SNR (Signal Clarity)
- Measures how much louder the signal is compared to background noise.
- Good: Above 17.5 dB
- Poor: Below 9 dB
- Analogy: In a quiet cafe, soft voices (RSSI = -115 dBm) are easy to understand because the noise is minimal (SNR = 25 dB).
Both strong RSSI and high SNR are needed for reliable communication.
| Metric | Good | Fair | Bad | Poor |
|---|---|---|---|---|
| RSSI | 🟢 > -115 dBm | 🟡 -115 dBm to -120 dBm | 🟠-120 dBm to -126 dBm | 🔴 ≤ -126 dBm |
| SNR | 🟢 > 17.5 dB | 🟡 11 dB to 17.5 dB | 🟠9 dB to 11 dB | 🔴 < 9 dB |