User Manual Part 2

Wi-Fi Array
292 Configuring the Wi-Fi Array
Procedure for Configuring Global 802.11n IAP Settings
1. 802.11n Data Rates: The Array allows you to define which data rates are
supported for all 802.11n radios. Select (or deselect) 11n data rates by
clicking in the corresponding Supported and Basic data rate check boxes.
• Basic Rate — a wireless station (client) must support this rate in
order to associate.
• Supported Rate — data rates that can be used to transmit to
clients.
2. 802.11n Mode: Select Enabled to operate in 802.11n mode, with four
802.11b/g/n mode ports and the remaining IAPs operating in 802.11a/n
mode. Use of this mode is controlled by the Array’s license key. The key
must include 802.11n capability, or you will not be able to enable this
mode. See “License” on page 132 to view the features supported by your
license key. Contact Xirrus Customer support for questions about your
license.
If you select Disabled, then 802.11n operation is disabled on the Array.
IAPs abgn1 though abgn4 will behave in the same way as IAPs abg1 to
abg4 on the XS Arrays; the 802.11a/n IAPs will operate in 802.11a mode.
3. TX Chains: Select the number of separate data streams transmitted by the
antennas of each IAP. The default is 3. See “Multiple Data Streams —
Spatial Multiplexing” on page 75.
4. RX Chains: Select the number of separate data streams received by the
antennas of each IAP. This number should be greater than or equal to TX
Chains. The default is 3. See “Multiple Data Streams — Spatial
Multiplexing” on page 75.
5. Guard interval: Select Short to increase the data transmission rate by
decreasing wait intervals in signal transmission. Select Long to use the
standard interval. The default is Short. See “Short Guard Interval” on
page 77.

802.11n operation is allowed only if the Array’s license includes this feature.
Please see “About Licensing and Upgrades” on page 325.