Technical Reference; Dynamic Channel Selection - ZyXEL Communications ZyWALL 110 User Manual

Table 82 Configuration > Wireless > Auto Healing (continued)
LABEL
Power Threshold
Apply
Reset

8.6 Technical Reference

The following section contains additional technical information about wireless features.

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 145 An Example Three-Channel Deployment
Three channels are situated in such a way as to create almost no interference with one another if
used exclusively: 1, 6 and 11. When an AP broadcasts on any of these three channels, it should not
interfere with neighboring APs as long as they are also limited to same trio.
Chapter 8 Wireless
DESCRIPTION
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.
Click Apply to save your changes back to the ZyWALL/USG.
Click Reset to return the screen to its last-saved settings.
ZyWALL/USG Series User's Guide
178