Which RSSI value indicates a strong signal?

The option that represents a strong signal is -30 dB. In the context of Received Signal Strength Indicator (RSSI) values, a higher numerical value (less negative) indicates a stronger signal, while a lower value (more negative) signifies a weaker signal.

An RSSI value of -30 dB suggests that the signal is quite strong, indicating close proximity to the access point or transmitter and minimal interference. This results in better connectivity and higher throughput for devices using that signal.

In comparison, -70 dB is generally considered a weak signal, likely leading to connectivity issues. An RSSI of -90 dB implies even weaker performance, potentially resulting in dropped connections or very slow speeds due to the low signal quality. Finally, -100 dB indicates a very poor signal, where reliable connections may be nearly impossible. Therefore, -30 dB is the most favorable value for optimal wireless communication.