3Com WX1200 3CRWX120695A Tuning the Transmit Data Rate, Defaults for RF Auto-Tuning Parameters

314CHAPTER 14: CONFIGURING RF AUTO-TUNING

A radio also can change its channel before the channel tuning interval expires to respond to RF anomalies. An RF anomaly is a sudden major change in the RF environment, such as sudden major interference on the channel.

By default, a radio cannot change its channel more often than every 900 seconds, regardless of the RF environment. This channel holddown avoids unnecessary changes due to very transient RF changes, such as activation of a microwave oven.

Tuning the Transmit Data Rate

A radio sends beacons, probe requests, and probe responses at the minimum transmit data rate allowed for clients. This gives them the maximum distance. All other packets are transmitted at a rate determined by their destination. All packets are transmitted at the same power level.

By default, the following minimum data rates are allowed:

„5.5 Mbps for 802.11b/g clients

„24 Mbps for 802.11a clients

You can statically change the transmit data rates for radios, on a radio profile basis. (For information, see “Changing Transmit Rates” on page 235). However, RF Auto-Tuning does not change transmit rates automatically.

RF Auto-TuningTable 25 lists the RF Auto-Tuning parameters and their default settings.

Parameters

Table 25 Defaults for RF Auto-Tuning Parameters

		Radio Behavior When Parameter Set
Parameter	Default Value	to Default Value
Radio profile parameters
channel-config	enable	When the radio is first enabled,
		RF Auto-Tuning sets the channel based
		on the channels in use on neighboring
		access points.
channel-interval	3600	Every 3600 seconds, MSS examines the
		RF information gathered from the

network and determines whether the channel needs to be changed to compensate for RF changes.