Transmit Power meaning on the SonicPoints:
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- Full Power sends the strongest signal on the WLAN.

                    For example, select Full Power if the signal is going from building‐to‐building.

- Half (‐3 dB) is recommended for office‐to‐office within a building.

- Quarter (‐6 dB) is recommended for short distance communications.

- Eighth (‐9 dB) is recommended for shorter distance communications shorter than -6dB.

- Minimum is recommended for very short distance communications which is shorter than -9dB.

Reasons to turn down the transmit power of your Wi-Fi

The transmit power of an AP affects the area covered and the maximum SNR achieved.

Proper configuration of transmit power is important for a wireless network when its operating at its highest capacity.

0dBm = 1mW
3dBm = 2mW
6dBm = 4mW
9dBm = 8mW
12dBm = 16mW
15dBm = 32mW
18dBm = 64mW
21dBm = 128mW
24dBm = 256mW
27dBm = 512mW