3Com WX1200 Reference Manual page 269

Auto Tune Tab
The Auto Tune tab lists settings for RF Auto-Tuning:
Tune Channel—Automatically configures and tunes the channel. This
feature is enabled by default.
RF Auto-Tuning of channels on 802.11a radios uses only the bottom
eight channels in the band (36, 40, 44, 48, 52, 56, 60, and 64). To use a
higher channel number, you must disable RF Auto-Tuning of channels on
the radio profile the radio is in, and statically configure the channel.
Tune Transmit Power—Automatically configures and tunes the power.
This feature is disabled by default.
Channel Tuning Interval—Interval at which RF Auto-Tuning decides
whether to change the channels on radios in a radio profile.
At the end of each interval, MSS processes the results of the RF scans
performed during the previous interval, and changes radio channels if
needed.
You can specify from 0 to 65535 seconds. The default channel interval
is 3600 seconds. 3Com recommends that you use an interval of at
least 300 seconds (5 minutes). If you set the interval to 0,
RF Auto-Tuning does not reevaluate the channel at regular intervals.
However, RF Auto-Tuning can still change the channel in response to
RF anomalies.
Tx. Power Tuning Interval—Interval at which RF Auto-Tuning decides
whether to change the power level on radios. You can specify from 1
to 65535 seconds. The default is 300 seconds.
Channel Tuning Holddown—Minimum number of seconds a radio in
a radio profile must remain at its current channel assignment before
RF Auto-Tuning can change the channel.
The channel holddown provides additional stability to the network by
preventing the radio from changing channels too rapidly in response
to spurious RF anomalies such as short-duration channel interference.
You can specify from 0 to 65535 seconds. The default channel interval
is 900 seconds.
Tx. Power Backoff Timer—Interval at which radios reduce power after
temporarily increasing the power to maintain the minimum data rate
for an associated client.
Viewing and Configuring Radio Profiles 269