Proxim ORiNOCO AP-4900M User Manual page 57

Advanced Configuration
Interfaces
4. Click OK.
5. Configure Transmit Power Control and Transmit Power Level if required.
Transmit Power Control/Transmit Power Level
Transmit Power Control uses standard 802.11d frames to control transmit power within an infrastructure BSS. This
method of power control is considered to be an interim way of controlling the transmit power of 802.11d enabled clients in
lieu of implementation of 802.11h.
When an AP comes online, it automatically uses the maximum TX power allowed in the regulatory domain. The Transmit
Power Control feature lets the user manually lower the transmit power level by setting a "back-off" value between
between 0 and 35 dBm.
When Transmit Power Control is enabled, the transmit power level of the card in the AP is set to the maximum transmit
power level minus the back-off value. This power level is advertised in Beacon and Probe Response frames as the
802.11d maximum transmit power level.
When an 802.11d-enabled client learns the regulatory domain related information from Beacon and Probe Response
frames, it learns the power level advertised in Beacon and Probe response frames as the maximum transmit power of the
regulatory domain and configures itself to operate with that power level.
As a result, the transmit power level of the BSS is configured to the power level set in the AP (assuming that the BSS has
only 802.11d enabled clients and an 802.11d enabled AP).
Configuring TX Power Control
1. Click Configure > Interfaces > Operational Mode.
2. Select Enable Transmit Power Control.
3. Enter the desired backoff from the maximum Transmit Power level (between 0 and 35 dBm) in the Wireless-A:
Transmit Power Level Back-Off or Wireless-B: Transmit Power Level Back-Off field.
4. Click OK.
AP-4000/4000M/4900M User Guide
57