Achieving High Throughput with 11n and
11ac Wireless APs
To achieve high
throughput with the wireless APs, configure your system as described in this
section.
Note
Some client devices choose a 2.4 GHz radio even when a 5 GHz high-speed radio network is available. You may need to force those client devices to use only 5 GHz if you have configured high throughput only on the 5 GHz radio.
To achieve high throughput
with a wireless AP:
-
From the top menu, click
AP.
-
Click the
appropriate wireless AP in the list (not the checkbox). The AP dashboard
displays.
-
Click Configure. The
AP Properties tab
displays.
-
For Radio 2 configure the following:
- In the Radio Mode drop-down list, click
b/g/n.
- In the Channel Width drop-down list,
click 40 MHz.
- Under Advanced Settings, in the Guard Interval drop-down list,
click Short.
- In the 11g Settings section, click
None in the
Protection Mode
drop-down list.
Note
Do not disable 802.11g protection mode if you have
802.11b or 802.11g client devices using this AP. Instead, configure only Radio
1 for high throughput unless it is acceptable to achieve less than maximum
802.11n throughput on Radio 2.
- If only 802.11n devices are present, disable 11n
protection and 40 MHz protection:
- Protection
Mode — Click None.
- Protection
Type — Click CTS only or RTS CTS.
Note
Do not
disable 802.11n protection mode if you have 802.11b or 802.11g client
devices using this AP. Instead, configure only Radio 1 for high
throughput unless it is acceptable to achieve less than maximum 802.11n
throughput on Radio 2.
- Aggregate MSDUs — Click Enabled.
- Aggregate MPDUs — Click Enabled.
- Aggregate MPDUs Max Length — Click 65535
(for the 802.11ac AP models).
- Agg.
MPDUs Max # of Sub-frames — Type 64.
- ADDBA Support — Click Enabled.
-
Click the Radio 1 tab, and then do the following:
- In the Admin Mode drop-down list, click
the On option.
- In the Radio Mode drop-down list, click
the a/n option for the AP3825, and click a/n/ac for the AP3865 and the
39xx series APs).
- In the Channel Width drop-down list,
click 40 MHz
(for the AP3825 and for the AP3865 and 39xx series, click
80
MHz).
- In the Guard Interval drop-down list,
click Short.
- If only 802.11n devices are present, disable 11n
protection and 40 MHz protection:
- Protection
Mode — Click None.
- Protection
Type — Click CTS only or RTS CTS.
- Aggregate MSDUs — Click Enabled.
- Aggregate MPDU — Click Enabled.
- Aggregate MPDU Max Length — Click Enabled.
- Agg.
MPDU Max # of Sub-frames — Type 64.
- ADDBA Support — Click Enabled.
-
From the top menu, click
VNS.
-
In the left pane select
WLAN Services and select the
WLAN (Wireless Local Area Network) service to configure.
-
Click the Privacy tab. Some client devices do not use 802.11n mode if they are
using WEP or TKIP for security. Do one of the following:
- Select None.
- Select WPA-PSK, and then clear the
WPA v.1 option:
- Select
WPA v.2.
- In the
Encryption
drop-down list, click AES
only.
Note
To achieve the strongest encryption
protection for your VNS, it is recommended that you use WPA
v.2.
-
Click the QoS tab. From the QoS tab, you can select WMM and Flexible Client
Access (FCA) to get better throughput.
Note
For FCA, go to
VNS > Global > Wireless QoS and set the
Fairness Policy to 100% Airtime.
-
In the Wireless QoS section, select the WMM
option. Some 802.11n client devices remain at legacy rates.