Chapter 43 Object
ZyWALL USG Series User’s Guide
816
2.4 GHz Channel
Selection Method
This field is available when you set Channel Selection to DCS.
Select auto to have the AP search for available channels automatically in the 2.4 GHz
band. The available channels vary depending on what you select in the 2.4 GHz Channel
Deployment field.
Select manual and specify the channels the AP uses in the 2.4 GHz band.
Channel ID This field is available only when you set Channel Selection to DCS and set 2.4 GHz Channel
Selection Method to manual.
Select the check boxes of the channels that you want the AP to use.
2.4 GHz Channel
Deployment
This field is available only when you set Channel Selection to DCS and set 2.4 GHz Channel
Selection Method to auto.
Select Three-Channel Deployment to limit channel switching to channels 1,6, and 11, the
three channels that are sufficiently attenuated to have almost no impact on one another.
In other words, this allows you to minimize channel interference by limiting channel-
hopping to these three “safe” channels.
Select Four-Channel Deployment to limit channel switching to four channels. Depending
on the country domain, if the only allowable channels are 1-11 then the Zyxel Device uses
channels 1, 4, 7, 11 in this configuration; otherwise, the Zyxel Device uses channels 1, 5, 9, 13
in this configuration. Four channel deployment expands your pool of possible channels
while keeping the channel interference to a minimum.
Enable 5 GHz DFS
Aware
This field is available only when you select 11a, 11a/n or 11ac in the 802.11 Band field.
Select this if your APs are operating in an area known to have RADAR devices. This allows
the device to downgrade its frequency to below 5 GHz in the event a RADAR signal is
detected, thus preventing it from interfering with that signal.
Enabling this forces the AP to select a non-DFS channel.
5 GHz Channel
Selection Method
This shows auto and allows the AP to search for available channels automatically in the 5
GHz band.
Advanced Settings
Country Code Select the country code of APs that are connected to the Zyxel Device to be the same as
where the Zyxel Device is located/installed.
The available channels vary depending on the country you selected. Be sure to select the
correct/same country for both radios on an AP and all connected APs, in order to prevent
roaming failure and interference to other systems.
Guard Interval This field is available only when the channel width is 20/40MHz or 20/40/80MHz.
Set the guard interval for this radio profile to either Short or Long.
The guard interval is the gap introduced between data transmission from users in order to
reduce interference. Reducing the interval increases data transfer rates but also increases
interference. Increasing the interval reduces data transfer rates but also reduces
interference.
Enable A-MPDU
Aggregation
Select this to enable A-MPDU aggregation.
Message Protocol Data Unit (MPDU) aggregation collects Ethernet frames along with their
802.11n headers and wraps them in a 802.11n MAC header. This method is useful for
increasing bandwidth throughput in environments that are prone to high error rates.
A-MPDU Limit Enter the maximum frame size to be aggregated.
A-MPDU
Subframe
Enter the maximum number of frames to be aggregated each time.
Table 305 Configuration > Object > AP Profile > Add/Edit Radio Profile (continued)
LABEL DESCRIPTION
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