A receiver picks up an RF signal from a distant transmitter. Which one of the following represents the best signal quality received? Example values are given in parentheses.
- Low SNR (10 dB), low RSSI (−75 dBm)
- High SNR (30 dB), low RSSI (−75 dBm)
- Low SNR (10 dB), high RSSI (−55 dBm)
- High SNR (30 dB), high RSSI (−55 dBm)
Explanation: A high SNR is best, where the received signal strength is more elevated above the noise floor. A 30 dBm SNR separates the signal from the noise more than a 10 dBm SNR does. Likewise, a higher RSSI value means that the signal strength alone is higher. When RSSI values are presented in dBm, remember that 0 dBm is high, while −100 dBm is very low.
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