D-Link DWS-1008 User Manual page 204

DWS-1008 User's Manual
• Utilization, calculated based on the number of multicast packets per second that
a radio can send on a channel while continuously sending fixed-size frames over a
period of time.
• Phy error count, which is the number of frames received by the AP radio that have
physical layer errors. A high number of Phy errors can indicate the presence of a
non-802.11 device using the same RF spectrum.
• Received CRC error count. A high number of CRC errors can indicate a hidden
node or co-channel interference.
The thresholds for these parameters are not configurable. RF AutoTuning also can change
a radio's channel when the channel tuning interval expires, if a channel that has less
disturbance is detected. Disturbance is based on the number of neighbors the radio has and
each neighbor's RSSI.
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
RF AutoTuning Parameters
The table below lists the RF AutoTuning parameters and their default settings.
Defaults for RF AutoTuning Parameters
Parameter
Radio profile parameters
channel-config
D-Link Systems, Inc.
Radio Behavior When
Default
Parameter Set To Default
Value
Value
enable When the radio is first enabled,
RF AutoTuning sets the
channel based on the channels
in use on neighboring access
points.
Configuring RF Auto-Tuning
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