H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 519)

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Item Description
Power Setup
Follow these guidelines when configuring power adjustment:
• If you lock the power first, and then enable power adjustment (by selecting Dynamic
Channel Select), power adjustment does not work because the power is locked.
Therefore, before enabling power adjustment, make sure the power is not locked.
• If you enable power adjustment and then lock the power, the last selected power is
locked.
For information about how to lock the power, see " Locking the power ."
Dynamic
Power Select
• Close—Disable transmit power control (TPC).
• Auto—With auto TPC enabled, the AC performs TPC for an AP upon
certain interference and returns the result to the AP after a calibration
interval (the default calibration interval is 8 minutes, which can be
set through the Calibration Interval option). After that, the AC makes
TPC decisions at the calibration interval automatically.
• Manual—With one-time TPC configured, an AC performs TPC for
the AP upon certain interference, and returns the result to the AP after
a calibration interval (the default calibration interval is 8 minutes,
which can be set through the Calibration Interval option). After that,
if you want the AC to perform TPC for the AP, you have to make this
configuration again.
IMPORTANT:
If you select the manual mode, click Calibration on the Calibration page
every time you perform channel calibration.
Adjacency
Factor Specify the neighbor APs that trigger automatic power adjustment. The
neighbor APs are managed by the same AC.
Power
Constraint
Enable the AC to notify all 802.11a clients to reduce their transmit
power by a specified value. For example, if the power constraint is set
to 5, the AC notifies 802.11a clients to decrease their maximum power
by 5 dBm.
By default, the transmit power for 802.11a radios is not restricted.
IMPORTANT:
Enable spectrum management before configuring the power constraint;
otherwise, the configuration does not take effect.
Channel switching results in temporary service interruption, so use the channel calibration function with
caution.
Configuring a radio group
With DFS or TPC configured for a radio, the AC calculates the channel quality or power of the radio at
the calibration interval. When the result meets a trigger condition, the AC selects a new channel or
power for the radio. In an environment where interference is serious, frequent channel or power
adjustments might affect user access to the WLAN network. In this case, you can configure a radio group
to keep the channel or power of radios in the group unchanged within a specified time. The channel and
power of radios not in the radio group are adjusted correctly.
After a channel or power adjustment (auto or initial DFS or TPC), the channel or power of any radio in
the radio group keeps unchanged within the specified holddown time. When the holddown time expires,
the AC calculates the channel or power again. If the result meets a trigger condition, the channel or