Users Guide

144 | Adaptive Radio Management (ARM) Dell PowerConnect ArubaOS 5.0 | [User Guide
Scanning The Scanning checkbox enables or disables AP scanning across multiple channels. Disabling this option
also disables the following scanning features:
z Multi Band Scan
z Rogue AP Aware
z Voip Aware Scan
z Power Save Scan
Do not disable Scanning unless you want to disable ARM and manually configure AP channel and
transmission power.
Default: enabled
Scan Time The amount of time, in milliseconds, an AP will step out of the current channel to scan another channel. The
supported range for this setting is 0–2,147,483,647 seconds. Dell recommends a scan time between 50–200
msec.
Default: 110 msec
VoIP Aware Scan Dell’s VoIP Call Admission Control (CAC) prevents any single AP from becoming congested with voice calls.
When you enable CAC, you should also enable VoIP Aware Scan in the ARM profile, so the AP will not
attempt to scan a different channel if one of its clients has an active VoIP call. This option requires that
Scanning is also enabled.
Default: disabled
Power Save
Aware Scan
If enabled, the AP will not scan a different channel if it has one or more clients that is in power save mode.
Default: enabled
Ideal Coverage
Index
The Dell coverage index metric is a weighted calculation based on the RF coverage for all DellAPs and
neighboring APs on a specified channel. The Ideal Coverage Index specifies the ideal coverage that an AP
should try to achieve on its channel. The denser the AP deployment, the lower this value should be. The
range of possible values is 2–20.
Default: 10
For additional information on how this the Coverage Index is calculated, see “ARM Metrics” on page150
Acceptable
Coverage Index
For multi-band implementations, the Acceptable Coverage Index specifies the minimal coverage an AP it
should achieve on its channel. The denser the AP deployment, the lower this value should be. The range of
possible values is 1–6.
Default: 4
Free Channel
Index
The Dell Interference index metric measures interference for a specified channel and its surrounding
channels. This value is calculated and weighted for all APs on those channels (including 3rd-party APs).
An AP will only move to a new channel if the new channel has a lower interference index value than the
current channel. Free Channel Index specifies the required difference between the two interference index
values before the AP moves to the new channel. The lower this value, the more likely it is that the AP will
move to the new channel. The range of possible values is 10–40.
Default: 25
For additional information on how this the Channel Index is calculated, see “ARM Metrics” on page150
Backoff TIme After an AP changes channel or power settings, it waits for the backoff time interval before it asks for a new
channel/power setting. The range of possible values is 120–3600 seconds.
Default: 240 seconds
Error Rate
Threshold
The minimum percentage of PHY errors and MAC errors in the channel that will trigger a channel change.
Default: 50%
Error Rate Wait
Time
Minimum time in seconds the error rate has to exceed the Error Rate Threshold before it triggers a channel
change.
Default: 30 seconds
Noise Threshold Maximum level of noise in channel that triggers a channel change. The range of possible 0–2,147,483,647
dBm.
Default 75 dBm
Table 34 ARM Profile Configuration Parameters
Setting Description