![]() ![]() However, the energy of electromagnetic waves attenuates quickly. In an antenna system, the antenna also needs to consume electric power to convert the electric energy into electromagnetic waves for transmission. For example, a 10 W bulb consumes 10 W of electric power when it is on for 1 hour. In our daily life, the power is typically the rate of doing work or the rate of using energy. For details about how to calculate the maximum transmission distance, see Coverage Calculation. Then, the maximum transmission distance can be calculated according to its relationship with the path loss. RSSI = Radio transmit power + TX antenna gain – Path loss – Signal attenuation caused by obstacles + RX antenna gainĪfter other factors except the path loss are determined, the path loss can be determined. The RSSI is calculated as follows (regardless of factors such as the interference and line loss): Uplink signal strength = 7 - 6 + 5 - 4 + 3 - 2. Uplink signal strength: signifies the strength of signals received by an AP from a wireless terminal. It is calculated as follows:ĭownlink signal strength = 1 - 2 + 3 - 4 + 5 - 6. As a result, wireless terminals receive weak signals or even fail to receive signals.ĭownlink signal strength: signifies the strength of signals received by a wireless terminal from an AP. Weak signal strength means that the RSSI is lower that the edge field strength. ![]() It is the value of the EIRP minus the transmission path loss and signal attenuation caused by obstacles. RSSI: signifies the signal strength at a location in the coverage area of a wireless network. During WLAN planning, ensure that the sum of the transmit power and antenna gain does not exceed the maximum value allowed by the country code.ĮIRP: signifies the strength of signals transmitted from an antenna. Radio transmit power: 1 signifies the radio transmit power of the AP 7 signifies the radio transmit power of the wireless terminal. 4: Path loss and signal attenuation caused by obstacles, that is, signal energy loss between the transmit antenna and receive antenna, in dB.2 and 6: Line loss caused by connectors and feeders connected to the antennas, in dB.1 and 7: Transmit power at the radio TX end, in dBm.Various other trademarks are held by their respective owners. WatchGuard and the WatchGuard logo are registered trademarks or trademarks of WatchGuard Technologies in the United States and other countries. If you have a -41dBm signal strength, and a -96dBm noise level, this results in an excellent signal-to-noise ratio of +55dB.If you have a -41dBm signal strength, and a -50dBm noise level, this results in a poor signal-to-noise ratio of +9dB.Lower values than +25dB result in poor performance and speeds. In general, you should have a minimum of +25dB signal-to-noise ratio.This value is represented in decibels (dB).The signal-to-noise ratio (SNR) is the power ratio between the signal strength and the noise level. For example, -96dBm is a lower noise level than ![]()
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