ZyXEL Communications NXC Series - Dynamic Channel Selection; Technical Reference

Chapter 8 Wireless
NXC Series User’s Guide
143
Each field is described in the following table.
8.6 Technical Reference
The following section contains additional technical information about the features described in this
chapter.
8.6.1 Dynamic Channel Selection
When numerous APs broadcast within a given area, they introduce the possibility of heightened radio
interference, especially if some or all of them are broadcasting on the same radio channel. If the
interference becomes too great, then the network administrator must open his AP configuration options
and manually change the channel to one that no other AP is using (or at least a channel that has a
lower level of interference) in order to give the connected stations a minimum degree of interference.
Dynamic channel selection frees the network administrator from this task by letting the AP do it
automatically. The AP can scan the area around it looking for the channel with the least amount of
interference.
In the 2.4 GHz spectrum, each channel from 1 to 13 is broken up into discrete 22 MHz segments that are
spaced 5 MHz apart. Channel 1 is centered on 2.412 GHz while channel 13 is centered on 2.472 GHz.
Figure 78 An Example Three-Channel Deployment
Table 63 Configuration > Wireless > Auto Healing
LABEL DESCRIPTION
Enable Auto
Healing
Select this option to turn on the auto healing feature.
Save Current
State
Click this button to have all manged APs immediately scan their neighborhoods three times in
a row and update their neighbor lists to the AP controller (NXC).
Auto Healing
Interval
Set the time interval (in minutes) at which the managed APs scan their neighborhoods and
report the status of neighbor APs to the AP controller (NXC).
An AP is considered “failed” if the AP controller obtains the same scan result that the AP is
missing from the neighbor list of other APs three times.
Power Threshold Set the power level (in dBm) to which the neighbor APs of the failed AP increase their output
power in order to extend their wireless service coverage areas.
When the failed AP is working again, its neighbor APs return their output power to the original
level.
Apply Click Apply to save your changes back to the NXC.
Reset Click Reset to return the screen to its last-saved settings.