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ATPC (Automatic Transmit Power Control) is a feature to automatically adapt
transmit power when the quality of the link is more than sufcient to maintain
a good communication with reduced transmit power. This feature is required for
FCC DFS.
By default, the unit lets you transmit at the maximum output power that the
unit can sustain for data rate and frequency selected. However, with Transmit
Power Control (TPC), you can adjust the output power of the unit to a lower
level in order to reduce interference to neighboring devices or to use a higher
gain antenna without violating the maximum radiated output power allowed.
Note:
When the system is set to transmit at the maximum power, professional
installers must ensure that the maximum EIRP limit is not exceeded. To
achieve this, they may have to add attenuation between the device and the
antenna when a high gain antenna is used.
To set the Transmit Power Control, click the Congure > Interfaces >
Wireless. The following selections are available:
TPC Selection Maximum TX Power
0 16
-3 13
-6 10
-9 7
-12 4
-15 1
-18 0
IMPORTANT!
To comply with FCC Part 90 regulations when using an external
antenna, a TPC value of -3 dB is required regardless of antenna size,
and a larger TPC value may be required to limit the total EIRP to 29
dBm or less.
For 4954-R models that have an integrated at-panel antenna, a
TPC of -9 dB must be used to comply with FCC Part 90 regulations.
To insure proper operation, TPC values greater than -9 dB should be
avoided.
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