Atpc Operation; Using Atpc - Extreme Networks Summit WM Technical Reference Manual

However, it is important to note the few ATPC limitations:
The ATPC algorithm does not know the desired coverage footprint for a Wireless AP so it is not a
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replacement for a site survey. However, it is a good addition to the site survey.
ATPC cannot always fully compensate for the changes in the RF environment because even the
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maximum allowed Tx may not be enough and because the Wireless AP has a limited view of the
actual degradation.

ATPC operation

Each Wireless AP with ATPC enabled will look at the closest (in terms of RF attenuation) Wireless AP
operating on the same channel with ATPC enabled, and will adjust Tx power depending on the
attenuation toward the closest Wireless AP.
NOTE
ATPC does not rely on the received signal strength. Instead, it relies on the RF attenuation between Wireless APs,
which is the difference between the power level at the transmitter and the received signal strength. Therefore, when
the Tx power changes on one Wireless AP, it will not induce Tx power changes on the neighboring Wireless APs.

Using ATPC

It is recommended to enable ATPC on all Wireless APs in the network.
1 – Using ATPC in a new deployment
For a new deployment, it is recommended to follow the procedure described below:
1 On the WAP Multi-edit screen, select all the Wireless APs.
2 From the Auto Tx Power Ctrl drop-down list, click On.
3 In the Max Tx Power drop-down list, click the maximum allowed, which is 18dBm for the default
internal and external antennas. (For more information, see the Summit WM User Guide for setting
Max Tx Power for other antennas.)
4 In the Min Tx Power drop-down list, click the minimum allowed, 8 dBm for 11b/g and 0dBm for
11a.
5 In the Auto Tx Power Ctrl Adjust drop-down list, click 0 dB.
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