Cisco aironet 1522 Design And Deployment Manual page 96

Connecting the Cisco 1520 Series Mesh Access Point to Your Network
From the AnchorTime drop-down box, choose a number to specify the time of day when the DCA
Step 5
algorithm is to start. The options are numbers between 0 and 23 (inclusive) representing the hour of the
day from 12:00 a.m. to 11:00 p.m.
Check the Avoid Foreign AP Interference check box to cause the controller's RRM algorithms to
Step 6
consider 802.11 traffic from foreign access points (those not included in your wireless network) when
assigning channels to lightweight access points, or uncheck it to disable this feature. For example, RRM
may adjust the channel assignment to have access points avoid channels close to foreign access points.
The default value is checked.
Check the Avoid Cisco AP Load check box to cause the controller's RRM algorithms to consider 802.11
Step 7
traffic from Cisco lightweight access points in your wireless network when assigning channels, or
uncheck it to disable this feature. For example, RRM can assign better reuse patterns to access points
that carry a heavier traffic load. The default value is unchecked.
Check the Avoid Non-802.11a (802.11b) Noise check box to cause the controller's RRM algorithms to
Step 8
consider noise (non-802.11 traffic) in the channel when assigning channels to lightweight access points,
or uncheck it to disable this feature. For example, RRM may have access points avoid channels with
significant interference from non-access point sources, such as microwave ovens. The default value is
checked.
Step 9 From the DCA Channel Sensitivity drop-down box, choose one of the following options to specify how
sensitive the DCA algorithm is to environmental changes such as signal, load, noise, and interference
when determining whether to change channels:
Low—The DCA algorithm is not particularly sensitive to environmental changes.
•
Medium—The DCA algorithm is moderately sensitive to environmental changes.
•
High—The DCA algorithm is highly sensitive to environmental changes.
•
The default value is Medium. The DCA sensitivity thresholds vary by radio band, as noted in
Table 15
Option
High
Medium
Low
For 802.11a/n networks only, choose one of the following Channel Width options to specify the channel
Step 10
bandwidth supported for all 802.11n radios in the 5-GHz band:
20 MHz—The 20-MHz channel bandwidth (default)
•
Note
This window also shows the following non-configurable channel parameter settings:
Channel Assignment Leader—The MAC address of the RF group leader, which is responsible for
•
channel assignment.
Last Auto Channel Assignment—The last time RRM evaluated the current channel assignments.
•
Cisco Aironet 1520, 1130, 1240 Series Wireless Mesh Access Points, Design and Deployment Guide, Release 6.0
96
DCA Sensitivity Thresholds
2.4-GHz DCA Sensitivity Threshold 5-GHz DCA Sensitivity Threshold
5 dB
15 dB
30 dB
To override the globally configured DCA channel width setting, you can statically configure
an access point's radio for 20-MHz mode on the 802.11a/n Cisco APs > Configure window.
If you ever then change the static RF channel assignment method to Global on the access
point radio, the global DCA configuration overrides the channel width configuration that the
access point was previously using.
5 dB
20 dB
35 dB
OL-20213-01
Table 15.