ZyXEL Communications ZyWALL 110 User Manual page 591

Table 247 Configuration > Object > AP Profile > Add/Edit Radio Profile (continued)
LABEL DESCRIPTION
2.4 GHz Channel This field is available when you set Channel Selection to DCS.
Selection Method
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 This field is available only when you set Channel Selection to DCS and set 2.4 GHz
Deployment
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
ZyWALL/USG uses channels 1, 4, 7, 11 in this configuration; otherwise, the ZyWALL/
USG 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 This field is available only when you select 11a, 11a/n or 11ac in the 802.11 Band
DFS Aware
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 This shows auto and allows the AP to search for available channels automatically in the
Selection Method
5 GHz band.
Advanced Settings
Country Code Select the country where the ZyWALL/USG 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 Select this to enable A-MPDU aggregation.
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 Enter the maximum number of frames to be aggregated each time.
Subframe
Chapter 35 Object
ZyWALL/USG Series User's Guide
591