3com WXR100 3CRWXR10095A User Manual

C

HAPTER

 14: C

ONFIGURING

 RF A

UTO

-T

UNING

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.

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.

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

Table 25   Defaults for RF Auto-Tuning Parameters

When the radio is first enabled, 
RF Auto-Tuning sets the channel based 
on the channels in use on neighboring 
access points.

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.