Chapter 29 Object
USG20(W)-VPN Series User’s Guide
474
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
USG uses channels 1, 4, 7, 11 in this configuration; otherwise, the 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
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 where the 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
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 190
Configuration > Object > AP Profile > Add/Edit Radio Profile (continued)
LABEL
DESCRIPTION
Summary of Contents for ZyWall USG20-VPN
Page 17: ...17 PART I User s Guide ...
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Page 99: ...99 PART II Technical Reference ...
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